阅读说明：本技术 空调系统、空调系统的控制方法和计算机可读存储介质 (Air conditioning system, control method of air conditioning system, and computer-readable storage medium ) 是由 郑春元 彭三国 黄金远 颜利波 于 2020-06-01 设计创作，主要内容包括：本发明提供了一种空调系统、空调系统的控制方法和计算机可读存储介质。空调系统包括：压缩机、室外换热器、经济器、第一阀、第二阀、存储器、处理器,经济器的第一出口与室外换热器相连通,第二出口与压缩机相连通,第一阀被配置为调节经经济器流入室外换热器的冷媒量,第二阀被配置为连通或隔断经济器和压缩机之间的冷媒通路,处理器被配置为用于执行计算机程序以实现：基于制热模式,第二阀连通经济器和压缩机之间的冷媒通路,获取排气过热度；基于排气过热度大于排气过热度阈值的情况,控制第一阀减小开度。本申请提供的空调系统,在排气过热度大于排气过热度阈值时,减小第一阀的开度,使大量冷媒经经济器快速流入压缩机,降低排气过热度。(The invention provides an air conditioning system, a control method of the air conditioning system, and a computer-readable storage medium. The air conditioning system includes: the economizer comprises a compressor, an outdoor heat exchanger, an economizer, a first valve, a second valve, a storage and a processor, wherein a first outlet of the economizer is communicated with the outdoor heat exchanger, a second outlet of the economizer is communicated with the compressor, the first valve is configured to adjust the amount of refrigerant flowing into the outdoor heat exchanger through the economizer, the second valve is configured to communicate with or block a refrigerant passage between the economizer and the compressor, and the processor is configured to execute a computer program to realize that: based on the heating mode, the second valve is communicated with a refrigerant passage between the economizer and the compressor to obtain the exhaust superheat degree; the first valve is controlled to decrease the opening degree based on the condition that the exhaust superheat degree is greater than the exhaust superheat degree threshold value. The application provides an air conditioning system when exhaust superheat degree is greater than exhaust superheat degree threshold value, reduces the aperture of first valve, makes a large amount of refrigerants flow in the compressor through the economic ware fast, reduces exhaust superheat degree.)

1. An air conditioning system, comprising:

a compressor;

the outdoor heat exchanger is communicated with the inlet end of the compressor;

an economizer, a first outlet of which is communicated with the outdoor heat exchanger and a second outlet of which is communicated with the compressor;

a first valve disposed between the first outlet and the outdoor heat exchanger, the first valve configured to adjust an amount of refrigerant flowing into the outdoor heat exchanger through the economizer;

a second valve configured to communicate or block a refrigerant passage between the economizer and the compressor;

a memory configured to store a computer program;

a processor configured to execute the computer program to implement:

based on the heating mode, the second valve is communicated with a refrigerant passage between the economizer and the compressor, and the exhaust superheat degree is obtained;

and controlling the first valve to reduce the opening degree based on the condition that the exhaust superheat degree is larger than an exhaust superheat degree threshold value.

2. The air conditioning system of claim 1, wherein the processor is further configured to execute the computer program to implement:

controlling the first valve to increase the opening degree based on the condition that the exhaust superheat degree is less than the exhaust superheat degree threshold value;

and controlling the first valve to maintain the current opening degree based on the condition that the exhaust superheat degree is equal to the exhaust superheat degree threshold value.

3. The air conditioning system of claim 2, wherein the processor executes the computer program to implement the step of controlling the first valve to decrease the opening or the step of controlling the first valve to increase the opening, comprising:

acquiring the current opening degree of the first valve;

determining the working speed for adjusting the opening degree of the first valve according to the current opening degree;

controlling said first valve to decrease opening degree according to said operating speed, or

And controlling the first valve to increase the opening degree according to the working speed.

4. The air conditioning system of claim 3, wherein the processor executes the computer program to perform the step of determining an operating speed to adjust the opening degree of the first valve based on the current opening degree, comprising:

determining a preset opening interval to which the current opening belongs;

determining the working speed as the working speed threshold corresponding to the preset opening interval;

the number of the preset opening intervals is at least two.

5. The air conditioning system of claim 4, wherein the preset opening intervals include a first preset opening interval, a second preset opening interval and a third preset opening interval, and the processor executes the computer program to implement the step of controlling the first valve to increase the opening according to the operating speed or to decrease the opening according to the operating speed, including:

controlling the first valve to increase the opening degree according to a first speed threshold value or controlling the first valve to decrease the opening degree according to the first speed threshold value on the basis of the condition that the opening degree interval to which the current opening degree belongs is the first preset opening degree interval;

controlling the first valve to increase the opening degree according to a second speed threshold value or controlling the first valve to decrease the opening degree according to the second speed threshold value on the basis of the condition that the opening degree section to which the current opening degree belongs is the second preset opening degree section;

controlling the first valve to increase the opening degree according to a third speed threshold value or controlling the first valve to decrease the opening degree according to the third speed threshold value on the basis of the condition that the opening degree interval to which the current opening degree belongs is the third preset opening degree interval;

the first preset opening degree interval is smaller than the second preset opening degree interval, and the second preset opening degree interval is smaller than the third preset opening degree interval;

the first speed threshold is less than the second speed threshold, which is less than the third speed threshold.

6. The air conditioning system of claim 5,

the maximum opening degree of the first valve is M;

the first preset opening interval is as follows: 0.2M to 0.4M;

the second preset opening interval is as follows: 0.4M to 0.7M;

the third preset opening interval is as follows: 0.7M to 1.0M;

the range of the exhaust superheat degree threshold is as follows: 20 ℃ to 25 ℃.

7. The air conditioning system of any of claims 2-6, wherein the processor is further configured to execute the computer program to implement:

controlling the opening degree of the first valve to be greater than or equal to a fourth opening degree threshold value, wherein the ratio range of the fourth opening degree threshold value to the maximum opening degree of the first valve is as follows: 0.2 to 0.3.

8. The air conditioning system of any one of claims 1 to 6, further comprising:

the air conditioner tail end equipment is communicated with the outlet end of the compressor, and the inlet of the economizer is communicated with the air conditioner tail end equipment;

the economizer includes a subcooler, the subcooler further includes:

a connection port in communication with the second outlet, the inlet in communication with the first outlet;

wherein the connection port is communicated with a pipeline between the air-conditioning terminal device and the inlet, or

The connecting port is communicated with the first outlet.

9. The air conditioning system of claim 8,

the second valve is arranged between the pipeline and the connecting port or between the second outlet and the compressor based on the fact that the connecting port is communicated with the pipeline between the air-conditioning end device and the inlet;

based on the connection port is communicated with the first outlet, the second valve is arranged between the pipeline between the first outlet and the first valve and the connection port, or the second valve is arranged between the second outlet and the compressor.

10. Air conditioning system according to any one of claims 1 to 6,

the economizer includes a flash vessel, the inlet communicating with the first outlet and the second outlet, and the second valve being disposed between the second outlet and the compressor.

11. A control method of an air conditioning system for the air conditioning system according to any one of claims 1 to 10, characterized by comprising:

based on the heating mode, the second valve is communicated with a refrigerant passage between the economizer and the compressor, and the exhaust superheat degree is obtained;

and controlling the first valve to reduce the opening degree based on the condition that the exhaust superheat degree is larger than an exhaust superheat degree threshold value.

12. A computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, realizes the steps of the control method of an air conditioning system according to claim 11.

Technical Field

The present invention relates to the field of air conditioning technologies, and in particular, to an air conditioning system, a control method of the air conditioning system, and a computer-readable storage medium.

Background

In the existing air conditioning system, under a low-temperature heating environment, an economizer is generally used for increasing the circulation quantity of a refrigerant by adopting a refrigerant injection enthalpy increasing technology so as to improve the heating capacity of the air conditioning system, and the control of the opening degree of a valve body for adjusting the quantity of the refrigerant flowing into an outdoor heat exchanger through the economizer is normally in positive correlation with the exhaust superheat degree, namely the larger the exhaust superheat degree is, the larger the opening degree of the valve body is, but at the moment, the problem that the quantity of the refrigerant flowing into a compressor through the economizer is reduced so that the exhaust superheat degree is conversely improved occurs.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art or the related art.

To this end, a first aspect of the invention proposes an air conditioning system.

A second aspect of the present invention provides a control method of an air conditioning system.

A third aspect of the invention proposes a computer-readable storage medium.

In view of this, a first aspect of the present invention provides an air conditioning system comprising: a compressor; the outdoor heat exchanger is communicated with the inlet end of the compressor; the first outlet of the economizer is communicated with the outdoor heat exchanger, and the second outlet of the economizer is communicated with the compressor; a first valve disposed between the first outlet and the outdoor heat exchanger, the first valve being configured to adjust an amount of refrigerant flowing through the economizer into the outdoor heat exchanger; a second valve configured to communicate with or block a refrigerant passage between the economizer and the compressor; a memory configured to store a computer program; a processor configured to execute a computer program to implement: based on the heating mode, the second valve is communicated with a refrigerant passage between the economizer and the compressor, and the exhaust superheat degree is obtained; the first valve is controlled to decrease the opening degree based on the condition that the exhaust superheat degree is greater than the exhaust superheat degree threshold value.

The invention provides an air conditioning system, which comprises a compressor, an outdoor heat exchanger, an economizer, a first valve, a second valve, a memory and a processor, wherein the outdoor heat exchanger is communicated with an inlet end of the compressor, the economizer comprises a first outlet and a second outlet, the first outlet is communicated with the outdoor heat exchanger, the second outlet is communicated with the compressor, the first valve is arranged between the first outlet and the outdoor heat exchanger and used for adjusting the quantity of refrigerant flowing into the outdoor heat exchanger through the economizer, the second valve is configured to be suitable for communicating or blocking a refrigerant passage between the economizer and the compressor, the memory is configured to be used for storing a computer program, and the processor is configured to execute the computer program to realize the following control strategy.

In the heating mode, under the condition that the second valve is communicated with a refrigerant passage between the economizer and the compressor, at the moment, the pressure of the low-pressure side of the air-conditioning system is lower, the quantity of the refrigerant flowing into the compressor through the economizer and the outdoor heat exchanger cannot meet the requirement of the heating capacity of the system, and then the second valve is communicated with the refrigerant passage between the economizer and the compressor, so that part of the refrigerant can quickly flow into the compressor through the economizer, the refrigerant circulation quantity of the air-conditioning system is improved, the heating capacity under the condition of low-temperature heating is improved, and meanwhile, the lower pressure is not beneficial to the refrigerant flowing into the compressor through the outdoor heat exchanger. By acquiring the exhaust superheat degree, when the exhaust superheat degree is larger than the exhaust superheat degree threshold value, it is indicated that the refrigerant quantity of a main loop of the air-conditioning system is small, if the opening degree of the first valve is increased to improve the refrigerant circulation quantity of the air-conditioning system as in the control method in the related art, as the opening degree of the first valve is larger, the pressure at the second outlet of the economizer is lower, that is, the refrigerant quantity flowing into the compressor through the second outlet of the economizer is reduced, and further the exhaust superheat degree is higher. Therefore, when the exhaust superheat degree is larger than the exhaust superheat degree threshold value, the opening degree of the first valve is reduced, the pressure at the second outlet of the economizer is larger, the rapid inflow of a large amount of refrigerants into the compressor through the economizer is facilitated, the exhaust superheat degree is reduced, the exhaust superheat degree tends to be stable, the refrigerant circulation quantity of the air conditioning system is facilitated to be rapidly improved, the heating capacity is improved, the problem that the heating capacity is reduced due to the fact that the exhaust superheat degree continues to be increased due to the fact that the opening degree of the first valve is increased in the related technology is avoided, the effectiveness of the air injection enthalpy increasing or liquid injection enthalpy increasing so as to improve the low-temperature heating capacity is effectively improved, the reliability of the heating capacity in the low-temperature environment is guaranteed, and the liquid injection enthalpy increasing device is suitable for popularization and application.

In addition, the air conditioning system in the above technical solution provided by the present invention may further have the following additional technical features:

in the above technical solution, further, the processor is further configured to execute the computer program to implement: controlling the first valve to increase the opening degree based on the condition that the exhaust superheat degree is smaller than the exhaust superheat degree threshold value; and controlling the first valve to maintain the current opening degree based on the condition that the exhaust superheat degree is equal to the exhaust superheat degree threshold value.

In the technical scheme, on one hand, when the exhaust superheat degree is smaller than the exhaust superheat degree threshold value, the pressure at the second outlet of the economizer is reduced by controlling the first valve to increase the opening degree, so that the amount of refrigerant flowing into the compressor through the second outlet of the economizer is reduced, the exhaust superheat degree is favorably and rapidly improved, the good heating capacity of the air-conditioning system is ensured, and the performance and the energy efficiency of the air-conditioning system are matched.

On the other hand, when the exhaust superheat degree is equal to the exhaust superheat degree threshold value, the current heating capacity of the air conditioning system is stable, the current opening degree is maintained by controlling the first valve, so that the refrigerant circulation quantity of the air conditioning system is matched with the exhaust superheat degree, the reliable operation of the air conditioning system is facilitated under the condition that the stable heating capacity is guaranteed, and the reliability of the air conditioning system is improved.

In any of the above solutions, further, the processor executes a computer program to implement the step of controlling the first valve to decrease the opening degree, or the step of controlling the first valve to increase the opening degree, including: acquiring the current opening degree of the first valve; determining a working speed for adjusting the opening degree of the first valve according to the current opening degree; the first valve is controlled to decrease the opening degree according to the operating speed, or the first valve is controlled to increase the opening degree according to the operating speed.

In this technical solution, a specific control scheme of controlling the first valve to decrease the opening degree or a specific control scheme of controlling the first valve to increase the opening degree is defined. The smaller the current opening degree of the first valve is, the faster the flow characteristic change speed of the refrigerant is, that is, the smaller the current opening degree is, the situation that the refrigerant is increased suddenly and decreased suddenly is easy to occur, that is, the linearity of the flow characteristic of the refrigerant is poor, so that the pressure change at the second outlet of the second valve is large, the refrigerant quantity flowing into the compressor through the second outlet of the economizer is large, the superheat degree of the system is large, and the heating capacity is unstable. And this application is through obtaining the current aperture of first valve, confirm the operating speed who adjusts the aperture of first valve according to current aperture for the operating speed who adjusts the aperture of first valve and the current aperture phase-match of first valve, according to the operating speed control first valve with current aperture phase-match reduces the aperture promptly, or according to the operating speed control first valve increase aperture with current aperture phase-match, can avoid air conditioning system's refrigerant volume fluctuation great, and then be favorable to improving the stability of air conditioning system heating capacity, improve air conditioning system's reliability.

In any of the above solutions, further, the processor executes a computer program to implement the step of determining an operating speed for adjusting the opening degree of the first valve according to the current opening degree, including: determining a preset opening interval to which the current opening belongs; determining the working speed as a working speed threshold corresponding to a preset opening interval; wherein, the number of the preset opening intervals is at least two.

In the technical scheme, a specific control scheme for determining and adjusting the working speed of the opening degree of the first valve according to the current opening degree is defined, and firstly, a plurality of preset opening degree intervals to which the current opening degree belongs are determined, namely the number of the preset opening degree intervals can be two, three, four or other numbers, and any preset opening degree interval corresponds to a corresponding working speed threshold; and then, determining a working speed threshold corresponding to a preset opening interval to which the current opening belongs, and determining the working speed threshold as the working speed corresponding to the current opening, namely, limiting the mapping relation between the preset opening interval and the working speed threshold, so that the working speed for adjusting the opening of the first valve always corresponds to the preset interval to which the current opening belongs, which is beneficial to further improving the stability of the heating capacity of the air-conditioning system and improving the reliability of the air-conditioning system.

In any of the above technical solutions, further, the preset opening interval includes a first preset opening interval, a second preset opening interval, and a third preset opening interval, and the processor executes a computer program to implement the step of controlling the first valve to increase the opening according to the working speed, or controlling the first valve to decrease the opening according to the working speed, including: controlling the first valve to increase the opening degree according to a first speed threshold value or controlling the first valve to decrease the opening degree according to the first speed threshold value on the basis of the condition that the opening degree interval to which the current opening degree belongs is a first preset opening degree interval; controlling the first valve to increase the opening degree according to a second speed threshold value or controlling the first valve to decrease the opening degree according to the second speed threshold value on the basis of the condition that the opening degree section to which the current opening degree belongs is a second preset opening degree section; controlling the first valve to increase the opening degree according to a third speed threshold value or controlling the first valve to decrease the opening degree according to the third speed threshold value on the basis of the condition that the opening degree interval to which the current opening degree belongs is a third preset opening degree interval; the first preset opening degree interval is smaller than a second preset opening degree interval, and the second preset opening degree interval is smaller than a third preset opening degree interval; the first speed threshold is less than the second speed threshold, which is less than the third speed threshold.

In the technical scheme, a specific control scheme for controlling the first valve to increase the opening degree according to the working speed or controlling the first valve to decrease the opening degree according to the working speed is defined, wherein the preset opening degree interval sequentially comprises from small to large: the device comprises a first preset opening degree interval, a second preset opening degree interval and a third preset opening degree interval, wherein correspondingly, the first preset opening degree interval corresponds to a first speed threshold, the second preset opening degree corresponds to a second speed threshold, and the third preset opening degree interval corresponds to a third speed threshold, wherein the first speed threshold is smaller than the second speed threshold, and the second speed threshold is smaller than the third speed threshold.

On one hand, when the opening degree section to which the current opening degree belongs is a first preset opening degree section, the situation that the current opening degree is small and sudden increase and sudden decrease of the refrigerant in the air conditioning system are easy to occur is explained, i.e., the linearity of the flow characteristic of the refrigerant is very poor, the pressure variation at the second outlet of the economizer is very large, so that the quantity of the refrigerant flowing into the compressor through the second outlet of the economizer is greatly changed, the superheat degree of the system is greatly changed, namely, the quantity of the refrigerant is sensitive to the stability of the system, and the opening degree of the first valve is controlled to be increased according to the smaller first speed threshold value, or the opening degree of the first valve is reduced by controlling the first valve according to a smaller first speed threshold value, so that the refrigerant circulation quantity of the main loop is slowly increased or slowly reduced, the fluctuation of the refrigerant quantity of the air-conditioning system is favorably reduced and alleviated, and further, the stability of the heating capacity of the air conditioning system is improved, and the reliability of the air conditioning system is improved.

On the other hand, based on the condition that the opening degree interval to which the current opening degree belongs is the second preset opening degree interval, the current opening degree is moderate, the condition that sudden increase and sudden decrease of the refrigerant in the air conditioning system occur is less, namely the linearity of the flow characteristic of the refrigerant tends to be stable, the pressure change of the second outlet of the economizer is small, so that the change of the refrigerant quantity flowing into the compressor through the second outlet of the economizer is small, the change of the superheat degree of the system is small, namely the influence of the refrigerant quantity on the stability of the system is not very sensitive, the first valve is controlled to increase the opening degree according to the moderate second speed threshold value, or the first valve is controlled to decrease the opening degree according to the moderate second speed threshold value, the refrigerant circulation quantity of the main loop is stably increased or stably decreased, and the heating capacity of the system is rapidly improved while the stability of the heating capacity of the system is ensured.

On the other hand, when the opening interval to which the current opening belongs is the third preset opening interval, the current opening is larger, the operation of the refrigerant in the air-conditioning system is more stable, namely the flow characteristic of the refrigerant is better in linearity, the pressure at the second outlet of the economizer tends to be stable, so that the change of the amount of the refrigerant flowing into the compressor through the second outlet of the economizer is very small, the superheat degree of the system tends to be stable, namely the influence of the amount of the refrigerant on the stability of the system is insensitive, and then the first valve is controlled to increase the opening according to the larger third speed threshold value, or the first valve is controlled to decrease the opening according to the larger third speed threshold value, so that the refrigerant circulation amount of the main loop is rapidly increased or rapidly decreased, the heating capacity of the air-conditioning system is rapidly improved, and the heating capacity is more stable.

In any of the above technical solutions, further, the maximum opening degree of the first valve is M; the first preset opening interval is as follows: 0.2M to 0.4M; the second preset opening interval is as follows: 0.4M to 0.7M; the third preset opening interval is as follows: 0.7M to 1.0M; the range of the exhaust superheat threshold is as follows: 20 ℃ to 25 ℃.

In the technical scheme, the maximum opening degree of the first valve is M, the first preset opening degree interval is 0.2M to 0.4M, the second preset opening degree interval is 0.4M to 0.7M, and the third preset opening degree interval is 0.7M to 1.0M through reasonable setting, so that the current opening degree of the first valve can be ensured to belong to any one of the first preset interval, the second preset interval and the third preset interval, and further the first valve is adjusted to increase the opening degree or decrease the opening degree according to the working speed matched with the current opening degree.

The range of the exhaust superheat threshold value is 20-25 ℃, specifically, the exhaust superheat threshold value can be set according to the actual performance of the compressor, the reasonable range of the exhaust superheat threshold value enables the performance of the compressor to be matched with the energy efficiency, the effectiveness of enthalpy increase of refrigerant injection is improved, the heating capacity is improved, and the reliability of the compressor is improved.

In any of the above solutions, further, the processor is further configured to execute the computer program to implement: controlling the opening degree of the first valve to be greater than or equal to a fourth opening degree threshold value, wherein the ratio range of the fourth opening degree threshold value to the maximum opening degree of the first valve is as follows: 0.2 to 0.3.

In the technical scheme, the opening degree of the first valve is controlled to be larger than or equal to the fourth opening degree threshold, the ratio range of the fourth opening degree threshold to the maximum opening degree of the first valve is 0.2-0.3, namely the fourth opening degree threshold is 0.2-0.3M, namely the minimum opening degree of the first valve is 0.2-0.3M, wherein M is the maximum opening degree of the first valve, so that the current opening degree of the first valve is always larger than or equal to the minimum opening degree of the first valve, and the problems that the flow characteristic change speed of a refrigerant is very fast due to the fact that the current opening degree of the first valve is very small, the refrigerant is obviously increased and reduced suddenly, the pressure change at the second outlet of the economizer is very large, the refrigerant flowing into the compressor through the second outlet of the economizer is very large, the superheat degree change of a system is very large, namely the system fluctuation is large, and the system reliability is caused are solved. This application is favorable to improving the stability of system's heating ability through the minimum aperture (fourth opening threshold) of reasonable setting first valve, prolongs air conditioning system's life.

In the above technical solution, further, the method further includes: and the air conditioner end equipment is communicated with the outlet end of the compressor, and the inlet of the economizer is communicated with the air conditioner end equipment.

In the technical scheme, the air conditioning system also comprises an air conditioning tail end device, the air conditioning tail end device is communicated with the outlet end of the compressor, the inlet of the economizer is communicated with the air conditioning tail end device, namely, a refrigerant in the air-conditioning system forms a system main loop through the outlet end of the compressor, the air-conditioning terminal equipment, the inlet of the economizer, the first outlet of the economizer, the outdoor heat exchanger and the inlet returning to the compressor, the refrigerant forms a system auxiliary loop through the outlet end of the compressor, the air-conditioning terminal equipment, the inlet of the economizer, the second outlet of the economizer and the compressor, in a heating mode of low-temperature environment, the economizer is communicated with the compressor through the second valve, so that the auxiliary loop injects gaseous refrigerant or vapor-liquid mixed refrigerant into the medium-pressure cavity of the compressor for enthalpy increase, the refrigerant circulation quantity of the air conditioning system is improved, and the heating capacity of the air conditioner at low temperature is improved.

In any of the above technical solutions, further, the economizer includes a subcooler, and the subcooler further includes: the connecting port is communicated with the second outlet, and the inlet is communicated with the first outlet; the connecting port is communicated with a pipeline between the air conditioner terminal equipment and the inlet, or the connecting port is communicated with the first outlet.

In the technical scheme, the economizer comprises a subcooler and a connecting port, the connecting port is communicated with the second outlet, the inlet is communicated with the first outlet, on one hand, the connecting port is communicated with a pipeline between the air conditioner terminal equipment and the inlet, namely the connecting port is positioned at the upstream of the subcooler; on the other hand, the connecting port is communicated with the first outlet, namely the connecting port is communicated with a pipeline between the first outlet of the subcooler and the outdoor heat exchanger, namely the connecting port is positioned at the downstream of the subcooler. Different setting positions and different connection modes of the connectors can meet the requirements of different structures of the subcooler and different connection modes of pipelines of the air conditioning system, and the application range is wide.

In any of the above technical solutions, further, based on the connection between the connection port and the pipeline between the air-conditioning terminal device and the inlet, the second valve is disposed between the pipeline and the connection port, or the second valve is disposed between the second outlet and the compressor; based on the connection of the connecting port and the first outlet, the second valve is arranged between the connecting port and a pipeline between the first outlet and the first valve, or the second valve is arranged between the second outlet and the compressor.

In this technical scheme, based on the connecting port and air conditioner end equipment and the import between the pipeline be linked together, on the one hand, the second valve is located between pipeline and the connecting port, and the refrigerant volume that flows into the connecting port through air conditioner end equipment is adjusted to the second valve promptly, and then realizes adjusting the refrigerant volume that flows into the compressor through the cold ware. On the other hand, the second valve is arranged between the second outlet and the compressor, namely the second valve adjusts the refrigerant quantity flowing into the compressor through the second outlet of the cooler.

Under the condition that the connecting port is communicated with the first outlet, on the one hand, the second valve is arranged between the connecting port and a pipeline between the first outlet and the first valve, namely the second valve is positioned on the pipeline deviating from the second outlet of the connecting port, the second valve adjusts the amount of the refrigerant flowing into the connecting port through the first outlet of the cooler, and then the amount of the refrigerant flowing into the compressor through the cooler is adjusted. On the other hand, the second valve is arranged between the second outlet and the compressor, namely the second valve adjusts the refrigerant quantity flowing into the compressor through the second outlet of the cooler.

In any of the above solutions, further, the economizer includes a flash evaporator, the inlet communicates with the first outlet and the second outlet, and the second valve is disposed between the second outlet and the compressor.

In the technical scheme, the economizer is a flash evaporator, the inlet is communicated with the first outlet, the inlet is communicated with the second outlet, namely, the refrigerant flowing in through the inlet can flow out through the first outlet and the second outlet and is arranged between the second outlet and the compressor through the second valve, so that the amount of the refrigerant flowing into the compressor through the second outlet of the flash evaporator is adjusted through the second valve, and the amount of the refrigerant flowing into the compressor through the flash evaporator is adjusted.

A second aspect of the present invention provides a control method for an air conditioning system, which is used in the air conditioning system according to any of the first aspects, and the control method for the air conditioning system includes: based on the heating mode, the second valve is communicated with a refrigerant passage between the economizer and the compressor, and the exhaust superheat degree is obtained; the first valve is controlled to decrease the opening degree based on the condition that the exhaust superheat degree is greater than the exhaust superheat degree threshold value.

The control method of the air conditioning system provided by the invention is used for the air conditioning system in any technical scheme of the first aspect, under the condition that the second valve is communicated with a refrigerant passage between the economizer and the compressor in the heating mode, at the moment, the pressure at the low-pressure side of the air conditioning system is lower, the amount of refrigerant flowing into the compressor through the economizer and the outdoor heat exchanger cannot meet the requirement of the heating capacity of the system, and further the second valve is communicated with the refrigerant passage between the economizer and the compressor, so that part of the refrigerant can quickly flow into the compressor through the economizer, the refrigerant circulation amount of the air conditioning system is increased, the heating capacity under the condition of low-temperature heating is further increased, and meanwhile, the lower pressure is not beneficial to the refrigerant flowing into the compressor through the outdoor heat exchanger. By acquiring the exhaust superheat degree, when the exhaust superheat degree is larger than the exhaust superheat degree threshold value, it is indicated that the refrigerant quantity of a main loop of the air-conditioning system is small, if the opening degree of the first valve is increased to improve the refrigerant circulation quantity of the air-conditioning system as in the control method in the related art, as the opening degree of the first valve is larger, the pressure at the second outlet of the economizer is lower, that is, the refrigerant quantity flowing into the compressor through the second outlet of the economizer is reduced, and further the exhaust superheat degree is higher. Therefore, when the exhaust superheat degree is larger than the exhaust superheat degree threshold value, the opening degree of the first valve is reduced, the pressure at the second outlet of the economizer is larger, the rapid inflow of a large amount of refrigerants into the compressor through the economizer is facilitated, the exhaust superheat degree is reduced, the exhaust superheat degree tends to be stable, the refrigerant circulation quantity of the air conditioning system is facilitated to be rapidly improved, the heating capacity is improved, the problem that the heating capacity is reduced due to the fact that the exhaust superheat degree continues to be increased due to the fact that the opening degree of the first valve is increased in the related technology is avoided, the effectiveness of the air injection enthalpy increasing or liquid injection enthalpy increasing so as to improve the low-temperature heating capacity is effectively improved, the reliability of the heating capacity in the low-temperature environment is guaranteed, and the liquid injection enthalpy increasing device is suitable for popularization and application.

In the above technical solution, further, the method further includes: controlling the first valve to increase the opening degree based on the condition that the exhaust superheat degree is smaller than the exhaust superheat degree threshold value; and controlling the first valve to maintain the current opening degree based on the condition that the exhaust superheat degree is equal to the exhaust superheat degree threshold value.

In any of the above technical solutions, further, the step of controlling the first valve to decrease the opening degree, or the step of controlling the first valve to increase the opening degree specifically includes: acquiring the current opening degree of the first valve; determining a working speed for adjusting the opening degree of the first valve according to the current opening degree; the first valve is controlled to decrease the opening degree according to the operating speed, or the first valve is controlled to increase the opening degree according to the operating speed.

In the above technical solution, further, the step of determining a working speed for adjusting the opening degree of the first valve according to the current opening degree specifically includes: determining a preset opening interval to which the current opening belongs; determining the working speed as a working speed threshold corresponding to a preset opening interval; wherein, the number of the preset opening intervals is at least two.

In any of the above technical solutions, further, the preset opening interval includes a first preset opening interval, a second preset opening interval and a third preset opening interval, and the step of controlling the first valve to increase the opening according to the operating speed or controlling the first valve to decrease the opening according to the operating speed specifically includes: controlling the first valve to increase the opening degree according to a first speed threshold value or controlling the first valve to decrease the opening degree according to the first speed threshold value on the basis of the condition that the opening degree interval to which the current opening degree belongs is a first preset opening degree interval; controlling the first valve to increase the opening degree according to a second speed threshold value or controlling the first valve to decrease the opening degree according to the second speed threshold value on the basis of the condition that the opening degree section to which the current opening degree belongs is a second preset opening degree section; controlling the first valve to increase the opening degree according to a third speed threshold value or controlling the first valve to decrease the opening degree according to the third speed threshold value on the basis of the condition that the opening degree interval to which the current opening degree belongs is a third preset opening degree interval; the first preset opening degree interval is smaller than a second preset opening degree interval, and the second preset opening degree interval is smaller than a third preset opening degree interval; the first speed threshold is less than the second speed threshold, which is less than the third speed threshold.

In any of the above technical solutions, further, the maximum opening degree of the first valve is M; the first preset opening interval is as follows: 0.2M to 0.4M; the second preset opening interval is as follows: 0.4M to 0.7M; the third preset opening interval is as follows: 0.7M to 1.0M; the range of the exhaust superheat threshold is as follows: 20 ℃ to 25 ℃.

In any of the above technical solutions, further, the method further includes: controlling the opening degree of the first valve to be greater than or equal to a fourth opening degree threshold value, wherein the ratio range of the fourth opening degree threshold value to the maximum opening degree of the first valve is as follows: 0.2 to 0.3.

In a third aspect of the present invention, a computer-readable storage medium is provided, on which a computer program is stored, which, when being executed by a processor, realizes the steps of the control method of the air conditioning system according to any one of the above-mentioned second aspect.

A computer-readable storage medium according to the present invention, having a computer program stored thereon, the computer program, when executed, implementing the steps of the control method of the air conditioning system according to any one of the above-described second aspects; therefore, all the advantageous technical effects of the control method of the air conditioning system according to any one of the above second aspects are achieved, and are not described herein again.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 shows a schematic block diagram of an air conditioning system provided by a first embodiment of the present invention;

fig. 2 is a schematic structural diagram of an air conditioning system according to an embodiment of the present invention;

FIG. 3 is a schematic view showing a connection structure of the first and second valves and the subcooler of the first embodiment of the present invention;

FIG. 4 is a schematic view showing a connection structure of first and second valves and a subcooler of a second embodiment of the present invention;

fig. 5 shows a schematic view of the connection structure of the first and second valves and the flash evaporator according to the third embodiment of the present invention;

fig. 6 is a flowchart illustrating a control method of an air conditioning system according to a first embodiment of the present invention;

fig. 7 is a flowchart illustrating a control method of an air conditioning system according to a second embodiment of the present invention;

fig. 8 is a flowchart illustrating a control method of an air conditioning system according to a third embodiment of the present invention;

fig. 9 is a flowchart illustrating a control method of an air conditioning system according to a fourth embodiment of the present invention;

fig. 10 is a flowchart illustrating a control method of an air conditioning system according to a fifth embodiment of the present invention.

Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 5 is:

500 air conditioning system, 510 compressor, 512 inlet port, 514 outlet port, 520 outdoor heat exchanger, 530 air conditioning end equipment, 540 economizer, 542 first outlet port, 544 second outlet port, 546 inlet port, 5402 subcooler, 5404 flash evaporator, 5406 connecting port, 550 first valve, 560 second valve, 570 storage, 580 processor, 600 outdoor unit.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

An air conditioning system 500, a control method of the air conditioning system, and a computer-readable storage medium according to some embodiments of the present invention are described below with reference to fig. 1 to 10.

Example 1:

as shown in fig. 1 to 5, the present invention provides an air conditioning system 500 including: a compressor 510, an outdoor heat exchanger 520, an economizer 540, a first valve 550, a second valve 560, a memory 570, and a processor 580.

Specifically, as shown in fig. 1 and 2, the outdoor heat exchanger 520 communicates with the inlet end 512 of the compressor 510, the economizer 540 includes a first outlet 542 and a second outlet 544, the first outlet 542 communicates with the outdoor heat exchanger 520, and the second outlet 544 of the economizer 540 communicates with the compressor 510; the first valve 550 is disposed between the first outlet 542 and the outdoor heat exchanger 520, and is configured to adjust an amount of refrigerant flowing into the outdoor heat exchanger 520 through the economizer 540; the second valve 560 is configured to communicate with or block a refrigerant passage between the economizer 540 and the compressor 510; the memory 570 is configured to store a computer program; the processor 580 is configured for executing a computer program to implement the following control strategy.

In the heating mode, when the second valve 560 communicates with the refrigerant passage between the economizer 540 and the compressor 510, it indicates that the pressure on the low-pressure side of the air conditioning system 500 is low, and the amount of the refrigerant flowing into the compressor 510 through the economizer 540 and the outdoor heat exchanger 520 cannot meet the requirement of the heating capacity of the system, and further communicates with the refrigerant passage between the economizer 540 and the compressor 510 through the second valve 560, so that a part of the refrigerant rapidly flows into the compressor 510 through the economizer 540, thereby increasing the refrigerant circulation amount of the air conditioning system 500, further increasing the heating capacity under the low-temperature heating condition, and meanwhile, the low pressure is not favorable for the refrigerant to flow into the compressor 510 through the outdoor heat exchanger 520. By obtaining the exhaust superheat degree, when the exhaust superheat degree is greater than the exhaust superheat degree threshold, it is indicated that the refrigerant quantity of the main circuit of the air conditioning system 500 is small, and if the opening degree of the first valve 550 is increased to increase the refrigerant circulation quantity of the air conditioning system 500 as in the related art, the larger the opening degree of the first valve 550 is, the lower the pressure at the second outlet 544 of the economizer 540 is, that is, the quantity of the refrigerant flowing into the compressor 510 through the second outlet 544 of the economizer 540 is reduced, and further, the exhaust superheat degree is higher on the contrary. Therefore, when the exhaust superheat degree is greater than the exhaust superheat degree threshold value, the opening degree of the first valve 550 is reduced, so that the pressure at the second outlet 544 of the economizer 540 is relatively high, the economizer 540 is favorable for a large amount of refrigerants to rapidly flow into the compressor 510, the exhaust superheat degree is reduced, the exhaust superheat degree tends to be stable, the refrigerant circulation quantity of the air conditioning system 500 is favorably and rapidly improved, the heating capacity is improved, the problem that the heating capacity is reduced due to the fact that the exhaust superheat degree continues to be increased due to the fact that the opening degree of the first valve 550 is increased in the related technology is solved, the effectiveness of the low-temperature heating capacity is effectively improved by increasing the injection enthalpy or increasing the liquid injection enthalpy, the reliability of the heating capacity in the low-temperature environment is guaranteed, and the method is suitable for popularization and application.

Specifically, in a low-temperature environment, the low pressure of the air conditioning system is very low, the return air density is small, and the circulation amount of the refrigerant is usually very small, so that the heating capacity of the air conditioning system in the low-temperature environment is insufficient. Due to the requirement of low-temperature heating, many air-conditioning systems adopt a refrigerant-spraying enthalpy-increasing technology to improve the heating capacity of the air-conditioning system at low temperature, and the technology is widely applied to the air-conditioning industry. The current refrigerant spraying enthalpy increasing technology comprises the following two modes, one mode is air spraying enthalpy increasing, and an economizer sprays gaseous refrigerant into a medium-pressure cavity of a compressor to realize enthalpy increasing effect in the compression process of the compressor; the other type is liquid spraying enthalpy increasing, and the economizer sprays vapor-liquid mixed refrigerant into a middle-pressure cavity of the compressor to realize enthalpy increasing effect in the compression process of the compressor, wherein the liquid spraying enthalpy increasing also becomes spraying two-phase refrigerant enthalpy increasing.

However, in the air conditioning system in the related art, under the condition of increasing enthalpy of the refrigerant injection, the control method of the first valve and the second valve is as follows: for the control of the first valve, on one hand, the control is carried out according to the difference between the discharge superheat degree of the compressor and the target superheat degree, when the discharge superheat degree is higher than the target superheat degree, the opening degree of the first valve is increased, and when the discharge superheat degree is lower than the target superheat degree, the opening degree of the first valve is decreased. On the other hand, the valve body between the corresponding outdoor heat exchanger and the compressor is adjusted and controlled according to the superheat degree of the outlet refrigerant of the outdoor heat exchanger and the target superheat degree, and generally, the valve body opening degree is increased when the detected superheat degree is larger than the target superheat degree, and the valve body opening degree is decreased when the detected superheat degree is smaller than the target superheat degree. Normally, the superheat degree of the outlet refrigerant of the outdoor heat exchanger is directly related to the superheat degree of return air of the compressor, and when the superheat degree of the return air is high, the corresponding exhaust superheat degree is also high generally. Therefore, the control principle of the first valve is mainly to control the flow of the refrigerant of the main loop, namely when the superheat degree of exhaust gas or return gas is higher than a target set value, the flow of the main loop is over small, and the opening degree of the first valve needs to be increased; conversely, the flow rate of the main circuit is too large, and the opening degree of the first valve needs to be reduced.

On one hand, the opening degree of the second valve is controlled according to the superheat degree of the refrigerant before the refrigerant enters the compressor from the second outlet of the economizer; on the other hand, the opening degree of the second valve is controlled in accordance with the degree of superheat of the exhaust gas.

In general, the enhanced vapor injection effect is determined primarily by the amount of refrigerant flowing into the compressor through the economizer, i.e., the amount of refrigerant flowing into the compressor through the second valve of the auxiliary circuit. The main factors influencing the amount of refrigerant flowing into the compressor through the economizer include at least the following: the pressure of the cavity communicated with the second outlet of the economizer by the compressor and the pressure difference of the second outlet are reduced; the pressure at the second outlet of the economizer; the mass percentage of the gas-liquid refrigerant at the second outlet of the economizer is reduced; the superheat degree of the refrigerant at the second outlet of the economizer. Tests show that the larger the amount of the refrigerant flowing into the compressor through the second outlet of the economizer, the lower the exhaust superheat degree of the compressor. In the control method for the first valve in the related art, when the system is required to perform enhanced vapor injection, if the exhaust superheat degree of the air conditioning system is higher, the opening degree of the main valve is larger, and at this time, the pressure of the second outlet of the economizer is lower, and the corresponding amount of refrigerant flowing into the compressor through the second outlet of the economizer is smaller, so that the exhaust superheat degree is increased on the contrary.

Therefore, when the exhaust superheat degree is greater than the exhaust superheat degree threshold value, the pressure at the second outlet 544 of the economizer 540 is increased by controlling the opening degree of the first valve 550 to be reduced, the amount of the refrigerant flowing into the compressor 510 through the second outlet 544 of the economizer 540 is increased, the exhaust superheat degree is further reduced, the low-temperature heating capacity of the system is improved, the effectiveness of enthalpy increase of refrigerant spraying is further improved, the heating capacity of the air-conditioning system 500 under the ultralow-temperature condition is favorably improved, the performance and the energy efficiency of the air-conditioning system 500 are adapted, and the reliability and the stability of the air-conditioning system 500 are improved.

Example 2:

as shown in fig. 1 to 5, the air conditioning system 500 provided by the present invention is further configured, on the basis of the above embodiment 1, in that the processor 580 is further configured to execute a computer program to implement: controlling the first valve 550 to increase the opening degree based on the case where the exhaust superheat degree is less than the exhaust superheat degree threshold; the first valve 550 is controlled to maintain the current opening degree based on the condition that the exhaust superheat degree is equal to the exhaust superheat degree threshold value.

In this embodiment, on the one hand, when the exhaust superheat is smaller than the exhaust superheat threshold, the pressure at the second outlet 544 of the economizer 540 is reduced by controlling the first valve 550 to increase the opening degree, so as to reduce the amount of the refrigerant flowing into the compressor 510 through the second outlet 544 of the economizer 540, which is beneficial to rapidly increasing the exhaust superheat, so as to ensure good heating capacity of the air conditioning system 500, and to adapt the performance of the air conditioning system 500 to the energy efficiency.

On the other hand, when the exhaust superheat degree is equal to the exhaust superheat degree threshold value, it is indicated that the current heating capacity of the air conditioning system 500 is relatively stable, and the current opening degree is maintained by controlling the first valve 550, so that the refrigerant circulation amount of the air conditioning system 500 is adapted to the exhaust superheat degree, and therefore, the air conditioning system 500 can operate reliably under the condition that the stable heating capacity is ensured, and the reliability of the air conditioning system 500 can be improved.

Further, the processor 580 executes a computer program to implement the step of controlling the first valve 550 to decrease the opening degree, or the step of controlling the first valve 550 to increase the opening degree, including: acquiring the current opening degree of the first valve 550; determining a working speed for adjusting the opening degree of the first valve 550 according to the current opening degree; the first valve 550 is controlled to decrease the opening degree according to the operating speed, or the first valve 550 is controlled to increase the opening degree according to the operating speed.

Specifically, a specific control scheme for controlling the first valve 550 to decrease the opening degree or a specific control scheme for controlling the first valve 550 to increase the opening degree is defined. Since the smaller the current opening degree of the first valve 550 is, the faster the flow rate characteristic change speed of the refrigerant is, that is, the smaller current opening degree is prone to the situation of sudden increase and sudden decrease of the refrigerant, that is, the linearity of the flow rate characteristic of the refrigerant is poor, so that the pressure change at the second outlet 544 of the second valve 560 is large, and further, the amount of the refrigerant flowing into the compressor 510 through the second outlet 544 of the economizer 540 is large, the system superheat degree is large, and the heating capacity is unstable. And this application is through obtaining the current aperture of first valve 550, confirm the operating speed who adjusts the aperture of first valve 550 according to current aperture for the operating speed who adjusts the aperture of first valve 550 matches with the current aperture of first valve 550, according to the operating speed control that matches with current aperture first valve 550 reduces the aperture promptly, or according to the operating speed control increase aperture with current aperture assorted first valve 550, can avoid air conditioning system 500's refrigerant volume fluctuation great, and then be favorable to improving air conditioning system 500 heating capacity's stability, improve air conditioning system 500's reliability. Specifically, the operating speed is the number of steps of valve body adjustment per unit time.

Further, the processor 580 executes a computer program to implement the steps of determining an operating speed for adjusting the opening degree of the first valve 550 according to the current opening degree, including: determining a preset opening interval to which the current opening belongs; determining the working speed as a working speed threshold corresponding to a preset opening interval; wherein, the number of the preset opening intervals is at least two.

Specifically, firstly, a preset opening interval to which the current opening belongs is determined, wherein the number of the preset opening intervals is multiple, that is, the number of the preset opening intervals can be two, three, four or other numbers, and any preset opening interval corresponds to a corresponding working speed threshold; then, a working speed threshold corresponding to a preset opening interval to which the current opening belongs is determined, and the working speed threshold is determined as a working speed corresponding to the current opening, that is, by limiting a mapping relationship between the preset opening interval and the working speed threshold, the working speed for adjusting the opening of the first valve 550 always corresponds to the preset interval to which the current opening belongs, which is beneficial to further improving the stability of the heating capacity of the air conditioning system 500 and improving the reliability of the air conditioning system 500.

Example 3:

as shown in fig. 1 to 5, the air conditioning system 500 according to the present invention, based on the above embodiment 2, further includes that the preset opening interval includes a first preset opening interval, a second preset opening interval and a third preset opening interval, and the processor 580 executes a computer program to implement the steps of controlling the first valve 550 to increase the opening according to the operating speed or controlling the first valve 550 to decrease the opening according to the operating speed, including: based on the condition that the opening degree section to which the current opening degree belongs is a first preset opening degree section, controlling the first valve 550 to increase the opening degree according to a first speed threshold value, or controlling the first valve 550 to decrease the opening degree according to the first speed threshold value; controlling the first valve 550 to increase the opening degree according to the second speed threshold value or controlling the first valve 550 to decrease the opening degree according to the second speed threshold value based on the condition that the opening degree section to which the current opening degree belongs is a second preset opening degree section; based on the condition that the opening range to which the current opening belongs is a third preset opening range, controlling the first valve 550 to increase the opening according to a third speed threshold, or controlling the first valve 550 to decrease the opening according to the third speed threshold; the first preset opening degree interval is smaller than a second preset opening degree interval, and the second preset opening degree interval is smaller than a third preset opening degree interval; the first speed threshold is less than the second speed threshold, which is less than the third speed threshold.

In this embodiment, a specific control scheme for controlling the first valve 550 to increase the opening degree according to the working speed or controlling the first valve 550 to decrease the opening degree according to the working speed is defined, wherein the preset opening degree intervals sequentially include, from small to large: the device comprises a first preset opening degree interval, a second preset opening degree interval and a third preset opening degree interval, wherein correspondingly, the first preset opening degree interval corresponds to a first speed threshold, the second preset opening degree corresponds to a second speed threshold, and the third preset opening degree interval corresponds to a third speed threshold, wherein the first speed threshold is smaller than the second speed threshold, and the second speed threshold is smaller than the third speed threshold.

On the one hand, based on the fact that the opening degree section to which the current opening degree belongs is the first preset opening degree section, it is described that the current opening degree is small, and the refrigerant in the air conditioning system 500 is likely to suddenly increase or decrease, that is, the flow characteristic of the refrigerant is very poor in linearity, the pressure change at the second outlet 544 of the economizer 540 is very large, so that the amount of the refrigerant flowing into the compressor 510 through the second outlet 544 of the economizer 540 is very large, the superheat degree of the system is very large, that is, the refrigerant amount is sensitive to the stability of the system, and the opening degree of the first valve 550 is controlled to increase according to the small first speed threshold, or the opening degree of the first valve 550 is controlled to decrease according to the small first speed threshold, so that the refrigerant circulation amount of the main loop is slowly increased or slowly decreased, which is beneficial to reducing and relaxing the volatility of the refrigerant amount of the air conditioning system 500, and is beneficial to improving the stability of the heating capacity of the air conditioning system 500, the reliability of the air conditioning system 500 is improved.

On the other hand, based on the fact that the opening degree section to which the current opening degree belongs is the second preset opening degree section, it is described that the current opening degree is moderate, the refrigerant in the air conditioning system 500 has fewer sudden increase and sudden decrease situations, that is, the linearity of the flow characteristic of the refrigerant tends to be stable, the pressure change at the second outlet 544 of the economizer 540 is small, so that the amount of the refrigerant flowing into the compressor 510 through the second outlet 544 of the economizer 540 is small, the change of the superheat degree of the system is small, that is, the influence of the amount of the refrigerant on the stability of the system is not very sensitive at this time, and then the first valve 550 is controlled to increase the opening degree according to the moderate second speed threshold, or the first valve 550 is controlled to decrease the opening degree according to the moderate second speed threshold, so that the refrigerant circulation amount of the main loop is stably increased or stably decreased, which is beneficial to ensuring the stability of the heating capacity of the system and simultaneously quickly improving the heating capacity of the system.

On the other hand, when the opening degree interval to which the current opening degree belongs is the third preset opening degree interval, it is described that the current opening degree is large, the operation of the refrigerant in the air conditioning system 500 is stable, that is, the linearity of the flow characteristic of the refrigerant is good, and the pressure at the second outlet 544 of the economizer 540 tends to be stable, so that the change of the amount of the refrigerant flowing into the compressor 510 through the second outlet 544 of the economizer 540 is very small, and the superheat degree of the system tends to be stable, that is, the influence of the amount of the refrigerant on the stability of the system is not sensitive at this time, and then the first valve 550 is controlled to increase the opening degree according to the larger third speed threshold, or the first valve 550 is controlled to decrease the opening degree according to the larger third speed threshold, so that the refrigerant circulation amount of the main loop is rapidly increased or rapidly decreased, which is beneficial to rapidly increasing the heating capacity of the air conditioning system 500, and the heating capacity is stable. Specifically, the first speed threshold is 4P/20s, i.e., 4 steps are adjusted every 20 seconds; the second speed threshold is 8P/20s, namely 8 steps are adjusted every 20 seconds; the third speed threshold is 12P/20s, i.e. 12 steps are adjusted every 20 seconds, it being understood that the first, second, third speed thresholds may be other speed thresholds that meet the requirements.

Further, the maximum opening of the first valve 550 is M, and by reasonably setting the first preset opening interval to 0.2M to 0.4M, the second preset opening interval to 0.4M to 0.7M, and the third preset opening interval to 0.7M to 1.0M, it can be ensured that the current opening of the first valve 550 can belong to any one of the first preset interval, the second preset interval, and the third preset interval, so that the first valve 550 is adjusted to increase or decrease the opening according to the working speed adapted to the current opening, and meanwhile, the first preset opening interval, the second preset opening interval, and the third preset interval are reasonably set, which is beneficial to reducing the fluctuation of the enthalpy of the air conditioning system 500, improving the stability of the low-temperature heating of the air conditioning system 500 and the reliability of the increase of the refrigerant spraying, and ensuring good heating capability, and is suitable for popularization and application.

Specifically, the exhaust superheat threshold ranges from 20 ℃ to 25 ℃, wherein the exhaust superheat threshold may be set according to the actual performance of the compressor 510, and the reasonable range of the exhaust superheat threshold enables the performance of the compressor 510 to be adapted to energy efficiency, so that the effectiveness of enthalpy increase of refrigerant injection is improved, the heating capacity is improved, and the reliability of the compressor 510 is improved. It is understood that the exhaust superheat threshold may be other ranges that meet the requirements, with the exhaust superheat threshold being 20 ℃, 22 ℃, 25 ℃.

Example 4:

as shown in fig. 1 to 5, the air conditioning system 500 provided by the present invention is based on any one of the above embodiments 1 to 3, and further, the processor 580 is further configured to execute the computer program to implement: controlling the opening degree of the first valve 550 to be greater than or equal to a fourth opening degree threshold, wherein the ratio range of the fourth opening degree threshold to the maximum opening degree of the first valve 550 is as follows: 0.2 to 0.3.

In this embodiment, by controlling the opening degree of the first valve 550 to be equal to or greater than the fourth opening degree threshold, the ratio of the fourth opening degree threshold to the maximum opening degree of the first valve 550 is in the range of 0.2 to 0.3, that is, the fourth opening degree threshold is in the range of 0.2M to 0.3M, that is, the minimum opening degree of the first valve 550 is in the range of 0.2M to 0.3M, where M is the maximum opening degree of the first valve 550, so that the current opening degree of the first valve 550 is always equal to or greater than the minimum opening degree of the first valve 550, and thus the problem of system reliability caused by the very fast change speed of the flow characteristic of the refrigerant due to the very small current opening degree of the first valve 550 and the obvious sudden increase and sudden decrease of the refrigerant, which causes the very large pressure change at the second outlet 544 of the economizer 540, the very large change of the superheat degree of the refrigerant flowing into the compressor 510 through the second outlet 544 of the economizer 540, that the system fluctuates greatly is avoided. This application is favorable to improving the stability of system's heating ability through the minimum aperture (fourth opening threshold) of reasonable setting first valve 550, prolongs air conditioning system 500's life.

Example 5:

as shown in fig. 1 to 5, the air conditioning system 500 according to the present invention further includes, in addition to any one of the embodiments 1 to 4: an air conditioning end unit 530, the air conditioning end unit 530 in communication with the outlet end 514 of the compressor 510, and an inlet 546 of the economizer 540 in communication with the air conditioning end unit 530.

Specifically, as shown in fig. 1, the air conditioning system 500 further includes an air conditioning end device 530, the air conditioning end device 530 is communicated with the outlet end 514 of the compressor 510, the inlet 546 of the economizer 540 is communicated with the air conditioning end device 530, that is, the refrigerant in the air conditioning system 500 forms a system main loop through the outlet end 514 of the compressor 510, the air conditioning end device 530, the inlet 546 of the economizer 540, the first outlet 542 of the economizer 540, the outdoor heat exchanger 520, and the inlet end 512 returning to the compressor 510, the refrigerant forms a system auxiliary loop through the outlet end 514 of the compressor 510, the air conditioning end device 530, the inlet 546 of the economizer 540, the second outlet 544 of the economizer 540, and the compressor 510, and in a heating mode of a low temperature environment, the economizer 540 and the compressor 510 are communicated through the second valve 560, so that enthalpy of the refrigerant in a gaseous state or a vapor-liquid mixture is injected into the cavity of the compressor 510 through the auxiliary loop to increase, to increase the refrigerant circulation amount of the air conditioning system 500, thereby improving the heating capacity of the air conditioner at a low temperature.

Specifically, the second outlet 544 of the economizer 540 communicates with the intermediate pressure chamber of the compressor 510, or with the inlet end 512 of the compressor 510. The first valve 550 is a solenoid valve or an electronic expansion valve, and the second valve 560 is a solenoid valve or an electronic expansion valve.

Specifically, the compressor 510, the outdoor heat exchanger 520, the economizer 540, the first valve 550 and the second valve 560 are collectively referred to as an outdoor unit 600, that is, the outdoor unit 600 is connected to the air conditioning end units 530 as a whole, it is understood that the number of the air conditioning end units 530 may be one or more, and the air conditioning system 500 of the present application may be a central air conditioning system 500. As shown in fig. 2, the air conditioning end device 530 is disposed between a and B of the air conditioning system 500.

Example 6:

as shown in fig. 1 to 5, in an embodiment of the present invention, on the basis of the above embodiment 5, further, the economizer 540 includes a subcooler 5402, and the subcooler 5402 further includes: a connection port 5406, the connection port 5406 communicates with the second outlet 544, and the inlet 546 communicates with the first outlet 542; wherein the connection port 5406 communicates with the piping between the air conditioning terminal 530 and the inlet 546, or the connection port 5406 communicates with the first outlet 542.

In this embodiment, the economizer 540 includes a subcooler 5402, the subcooler 5402 further includes a connection port 5406, the connection port 5406 communicates with the second outlet 544, the inlet 546 communicates with the first outlet 542, and on the one hand, as shown in fig. 3, the connection port 5406 communicates with the piping between the air conditioning terminal 530 and the inlet 546, i.e., the connection port 5406 is located upstream of the subcooler 5402; on the other hand, as shown in fig. 4, the connection port 5406 communicates with the first outlet 542, that is, the connection port 5406 communicates with a pipe between the first outlet 542 of the subcooler 5402 and the outdoor heat exchanger 520, that is, the connection port 5406 is located downstream of the subcooler 5402. Different arrangement positions and different connection modes of the connection ports 5406 can meet the requirements of different structures of the subcooler 5402 and different connection modes of pipelines of the air conditioning system 500, and the application range is wide. Specifically, the subcooler 5402 includes four ports of a first outlet 542, a second outlet 544, an inlet 546, and a connection port 5406.

Further, based on the connection between the connection port 5406 and the pipe between the air conditioner end device 530 and the inlet 546, on the one hand, the second valve 560 is disposed between the pipe and the connection port 5406, that is, the second valve 560 adjusts the amount of the refrigerant flowing into the connection port 5406 through the air conditioner end device 530, thereby adjusting the amount of the refrigerant flowing into the compressor 510 through the cooler 5402. On the other hand, as shown in fig. 4, the second valve 560 is disposed between the second outlet 544 and the compressor 510, that is, the second valve 560 adjusts the amount of the refrigerant flowing into the compressor 510 through the second outlet 544 of the cooler 5402.

Further, when the connection port 5406 communicates with the first outlet port 542, on one hand, the second valve 560 is disposed between a pipeline between the first outlet port 542 and the first valve 550 and the connection port 5406, that is, the second valve 560 is located on a pipeline of the connection port 5406 away from the second outlet port 544, and the second valve 560 adjusts an amount of the refrigerant flowing into the connection port 5406 through the first outlet port 542 of the cooler 5402, so as to adjust an amount of the refrigerant flowing into the compressor 510 through the cooler 5402. On the other hand, as shown in fig. 4, the second valve 560 is disposed between the second outlet 544 and the compressor 510, that is, the second valve 560 adjusts the amount of the refrigerant flowing into the compressor 510 through the second outlet 544 of the cooler 5402.

Example 7:

as shown in fig. 1 to 5, in an embodiment of the present invention, based on the embodiment 5, further, the economizer 540 comprises a flash evaporator 5404, the inlet 546 is communicated with the first outlet 542 and the second outlet 544, and the second valve 560 is disposed between the second outlet 544 and the compressor 510.

In this embodiment, as shown in fig. 5, the economizer 540 is a flash evaporator 5404, an inlet 546 is communicated with the first outlet 542, and an inlet 546 is communicated with the second outlet 544, that is, the refrigerant flowing in through the inlet 546 can flow out through the first outlet 542 and the second outlet 544, and is provided between the second outlet 544 and the compressor 510 through a second valve 560, so that the amount of the refrigerant flowing into the compressor 510 through the second outlet 544 of the flash evaporator 5404 is adjusted through the second valve 560, and the amount of the refrigerant flowing into the compressor 510 through the flash evaporator 5404 is adjusted.

Further, the air conditioning system 500 further includes a first temperature detecting device configured to detect a temperature of the outlet end 514 of the compressor 510 or detect a temperature of the inlet 546 of the air conditioning end device 530, and a second temperature detecting device configured to detect a saturation temperature corresponding to a pressure of a pipeline between the compressor 510 and the air conditioning end device 530, and further calculate the exhaust superheat degree according to a difference between the detected temperature of the first temperature detecting device and the detected temperature of the second temperature detecting device.

Specifically, the first temperature detecting device is disposed at the outlet end 514 of the compressor 510, and the second temperature detecting device is disposed on the pipeline between the first temperature detecting device and the air conditioner end device 530. The first temperature detection device is a temperature sensor, and the second temperature detection device is a temperature sensor. It is understood that the air conditioning system 500 may further include a first pressure detection device disposed on a pipeline between the first temperature detection device and the air conditioning end device 530 for detecting the condensing pressure of the air conditioning system 500, and a second temperature detection device for determining a protection temperature corresponding to the condensing pressure of the air conditioning system 500 according to a detection result of the first pressure detection device.

Example 8:

the invention provides a control method of an air conditioning unit, wherein an air conditioning system comprises a compressor, an outdoor heat exchanger, an economizer, a first valve and a second valve, the economizer comprises a first outlet and a second outlet, the first outlet is communicated with the outdoor heat exchanger, the second outlet is communicated with the compressor, the first valve is arranged between the first outlet and the outdoor heat exchanger and used for adjusting the amount of refrigerant flowing into the outdoor heat exchanger through the economizer, and the second valve is configured to be suitable for communicating or blocking a refrigerant passage between the economizer and the compressor. Specifically, the air conditioning system further comprises an air conditioning end device, the economizer is communicated with the air conditioning end device and the outdoor heat exchanger, namely a system main loop is formed by a refrigerant in the air conditioning system through an outlet end of the compressor, the air conditioning end device, a first outlet of the economizer, the outdoor heat exchanger and an inlet end returning to the compressor, the refrigerant forms a system auxiliary loop through the outlet end of the compressor, the air conditioning end device, a second outlet of the economizer and the compressor, and in a heating mode of a low-temperature environment, the refrigerant loop between the economizer and the compressor is communicated through a second valve, so that a gaseous refrigerant or a vapor-liquid mixed refrigerant is sprayed into a medium-pressure cavity of the compressor through the auxiliary loop to increase enthalpy, the refrigerant circulation quantity of the air conditioning system is increased, and the heating capacity of the air conditioning system in the low-temperature environment is improved.

Fig. 6 illustrates a control method of an air conditioning system according to a first embodiment of the present invention, the control method of the air conditioning system including:

step S102, based on the heating mode, the second valve is communicated with a refrigerant passage between the economizer and the compressor, and the exhaust superheat degree is obtained;

in step S104, the first valve is controlled to reduce the opening degree based on the condition that the exhaust superheat degree is larger than the exhaust superheat degree threshold value.

The application provides a control method of air conditioning system, in the heating mode, under the condition that the second valve communicates the refrigerant route between economizer and the compressor, at this moment, it explains that the pressure of the low pressure side of air conditioning system is lower, the quantity of refrigerant flowing into the compressor through the economizer, outdoor heat exchanger can not satisfy the demand of system heating capacity, and then communicate the refrigerant route between economizer and the compressor through the second valve, make partial refrigerant flow into the compressor through the economizer fast, in order to improve air conditioning system's refrigerant circulation volume, and then improve the heating capacity under the low temperature heating condition, simultaneously, lower pressure is unfavorable for the refrigerant to flow into the compressor through outdoor heat exchanger. By acquiring the exhaust superheat degree, when the exhaust superheat degree is larger than the exhaust superheat degree threshold value, it is indicated that the refrigerant quantity of a main loop of the air-conditioning system is small, if the opening degree of the first valve is increased to improve the refrigerant circulation quantity of the air-conditioning system as in the control method in the related art, as the opening degree of the first valve is larger, the pressure at the second outlet of the economizer is lower, that is, the refrigerant quantity flowing into the compressor through the second outlet of the economizer is reduced, and further the exhaust superheat degree is higher. Therefore, when the exhaust superheat degree is larger than the exhaust superheat degree threshold value, the opening degree of the first valve is reduced, the pressure at the second outlet of the economizer is larger, the rapid inflow of a large amount of refrigerants into the compressor through the economizer is facilitated, the exhaust superheat degree is reduced, the exhaust superheat degree tends to be stable, the refrigerant circulation quantity of the air conditioning system is facilitated to be rapidly improved, the heating capacity is improved, the problem that the heating capacity is reduced due to the fact that the exhaust superheat degree continues to be increased due to the fact that the opening degree of the first valve is increased in the related technology is avoided, the effectiveness of the air injection enthalpy increasing or liquid injection enthalpy increasing so as to improve the low-temperature heating capacity is effectively improved, the reliability of the heating capacity in the low-temperature environment is guaranteed, and the liquid injection enthalpy increasing device is suitable for popularization and application.

Example 9:

in one embodiment of the present invention, fig. 7 illustrates a control method of an air conditioning system of a second embodiment of the present invention, the control method of the air conditioning system including:

step S202, based on the heating mode, the second valve is communicated with a refrigerant passage between the economizer and the compressor, and the exhaust superheat degree is obtained;

step S204, controlling the first valve to reduce the opening degree based on the condition that the exhaust superheat degree is larger than the exhaust superheat degree threshold value;

step S206, controlling the first valve to increase the opening degree based on the condition that the exhaust superheat degree is smaller than the exhaust superheat degree threshold value;

in step S208, the first valve is controlled to maintain the current opening degree based on the condition that the exhaust superheat degree is equal to the exhaust superheat degree threshold value.

In this embodiment, on the basis of the above embodiment 8, on the one hand, when the exhaust superheat is smaller than the exhaust superheat threshold, the pressure at the second outlet of the economizer is reduced by controlling the first valve to increase the opening degree, so as to reduce the amount of refrigerant flowing into the compressor through the second outlet of the economizer, which is beneficial to rapidly increasing the exhaust superheat, so as to ensure good heating capacity of the air conditioning system, and enable the performance of the air conditioning system to be adapted to the energy efficiency.

On the other hand, when the exhaust superheat degree is equal to the exhaust superheat degree threshold value, the current heating capacity of the air conditioning system is stable, the current opening degree is maintained by controlling the first valve, so that the refrigerant circulation quantity of the air conditioning system is matched with the exhaust superheat degree, the reliable operation of the air conditioning system is facilitated under the condition that the stable heating capacity is guaranteed, and the reliability of the air conditioning system is improved.

Example 10:

in one embodiment of the present invention, fig. 8 shows a control method of an air conditioning system of a third embodiment of the present invention, the control method of the air conditioning system including:

step S302, based on the heating mode, the second valve is communicated with a refrigerant passage between the economizer and the compressor, and the exhaust superheat degree is obtained;

step S304, acquiring the current opening degree of the first valve based on the condition that the exhaust superheat degree is larger than the exhaust superheat degree threshold value;

step S306, determining the working speed for adjusting the opening degree of the first valve according to the current opening degree;

step S308, controlling the first valve to reduce the opening according to the working speed;

step S310, acquiring the current opening degree of the first valve based on the condition that the exhaust superheat degree is smaller than the exhaust superheat degree threshold value;

step S312, determining the working speed for adjusting the opening degree of the first valve according to the current opening degree;

step S314, controlling the first valve to increase the opening according to the working speed;

in step S316, the first valve is controlled to maintain the current opening degree based on the condition that the exhaust superheat degree is equal to the exhaust superheat degree threshold value.

In this embodiment, a specific control scheme for controlling the first valve to decrease the opening degree or a specific control scheme for controlling the first valve to increase the opening degree is defined. The smaller the current opening degree of the first valve is, the faster the flow characteristic change speed of the refrigerant is, that is, the smaller the current opening degree is, the situation that the refrigerant is increased suddenly and decreased suddenly is easy to occur, that is, the linearity of the flow characteristic of the refrigerant is poor, so that the pressure change at the second outlet of the second valve is large, the refrigerant quantity flowing into the compressor through the second outlet of the economizer is large, the superheat degree of the system is large, and the heating capacity is unstable. And this application is through obtaining the current aperture of first valve, confirm the operating speed who adjusts the aperture of first valve according to current aperture for the operating speed who adjusts the aperture of first valve and the current aperture phase-match of first valve, according to the operating speed control first valve with current aperture phase-match reduces the aperture promptly, or according to the operating speed control first valve increase aperture with current aperture phase-match, can avoid air conditioning system's refrigerant volume fluctuation great, and then be favorable to improving the stability of air conditioning system heating capacity, improve air conditioning system's reliability. Specifically, the operating speed is the number of steps of valve body adjustment per unit time.

Further, the step of determining the working speed for adjusting the opening degree of the first valve according to the current opening degree specifically includes: determining a preset opening interval to which the current opening belongs; determining the working speed as a working speed threshold corresponding to a preset opening interval; wherein, the number of the preset opening intervals is at least two.

Specifically, firstly, a preset opening interval to which the current opening belongs is determined, wherein the number of the preset opening intervals is multiple, that is, the number of the preset opening intervals can be two, three, four or other numbers, and any preset opening interval corresponds to a corresponding working speed threshold; and then, determining a working speed threshold corresponding to a preset opening interval to which the current opening belongs, and determining the working speed threshold as the working speed corresponding to the current opening, namely, limiting the mapping relation between the preset opening interval and the working speed threshold, so that the working speed for adjusting the opening of the first valve always corresponds to the preset interval to which the current opening belongs, which is beneficial to further improving the stability of the heating capacity of the air-conditioning system and improving the reliability of the air-conditioning system.

Example 11:

in an embodiment of the present invention, the preset opening degree sections include a first preset opening degree section, a second preset opening degree section and a third preset opening degree section, and fig. 9 shows a control method of an air conditioning system of a fourth embodiment of the present invention, the control method of the air conditioning system including:

step S402, based on the heating mode, the second valve is communicated with a refrigerant passage between the economizer and the compressor, and the exhaust superheat degree is obtained;

step S404, acquiring the current opening degree of the first valve based on the condition that the exhaust superheat degree is larger than the exhaust superheat degree threshold value;

step S406, determining the working speed for adjusting the opening degree of the first valve according to the current opening degree;

step S408, based on the condition that the opening degree interval to which the current opening degree belongs is a first preset opening degree interval, controlling the first valve to increase the opening degree according to a first speed threshold value;

step S410, based on the situation that the opening degree interval to which the current opening degree belongs is a second preset opening degree interval, controlling the first valve to increase the opening degree according to a second speed threshold value, wherein the first preset opening degree interval is smaller than the second preset opening degree interval, and the first speed threshold value is smaller than the second speed threshold value;

step S412, based on the situation that the opening degree interval to which the current opening degree belongs is a third preset opening degree interval, controlling the first valve to increase the opening degree according to a third speed threshold value, wherein the second preset opening degree interval is smaller than the third preset opening degree interval, and the second speed threshold value is smaller than the third speed threshold value;

step S414, acquiring the current opening degree of the first valve based on the condition that the exhaust superheat degree is smaller than the exhaust superheat degree threshold value;

step S416, determining the working speed for adjusting the opening degree of the first valve according to the current opening degree;

step S418, based on the situation that the opening degree interval to which the current opening degree belongs is a first preset opening degree interval, controlling the first valve to reduce the opening degree according to a first speed threshold value;

step S420, based on the situation that the opening degree interval to which the current opening degree belongs is a second preset opening degree interval, controlling the first valve to reduce the opening degree according to a second speed threshold value, wherein the first preset opening degree interval is smaller than the second preset opening degree interval, and the first speed threshold value is smaller than the second speed threshold value;

step S422, based on the situation that the opening degree interval to which the current opening degree belongs is a third preset opening degree interval, controlling the first valve to reduce the opening degree according to a third speed threshold value, wherein the second preset opening degree interval is smaller than the third preset opening degree interval, and the second speed threshold value is smaller than the third speed threshold value;

in step S424, the first valve is controlled to maintain the current opening degree based on the condition that the exhaust superheat degree is equal to the exhaust superheat degree threshold value.

In this embodiment, a specific control scheme for controlling the first valve to increase the opening degree according to the working speed or controlling the first valve to decrease the opening degree according to the working speed is defined, wherein the preset opening degree intervals sequentially include, from small to large: the device comprises a first preset opening degree interval, a second preset opening degree interval and a third preset opening degree interval, wherein correspondingly, the first preset opening degree interval corresponds to a first speed threshold, the second preset opening degree corresponds to a second speed threshold, and the third preset opening degree interval corresponds to a third speed threshold, wherein the first speed threshold is smaller than the second speed threshold, and the second speed threshold is smaller than the third speed threshold.

On one hand, when the opening degree section to which the current opening degree belongs is a first preset opening degree section, the situation that the current opening degree is small and sudden increase and sudden decrease of the refrigerant in the air conditioning system are easy to occur is explained, i.e., the linearity of the flow characteristic of the refrigerant is very poor, the pressure variation at the second outlet of the economizer is very large, so that the quantity of the refrigerant flowing into the compressor through the second outlet of the economizer is greatly changed, the superheat degree of the system is greatly changed, namely, the quantity of the refrigerant is sensitive to the stability of the system, and the opening degree of the first valve is controlled to be increased according to the smaller first speed threshold value, or the opening degree of the first valve is reduced by controlling the first valve according to a smaller first speed threshold value, so that the refrigerant circulation quantity of the main loop is slowly increased or slowly reduced, the fluctuation of the refrigerant quantity of the air-conditioning system is favorably reduced and alleviated, and further, the stability of the heating capacity of the air conditioning system is improved, and the reliability of the air conditioning system is improved.

On the other hand, based on the condition that the opening degree interval to which the current opening degree belongs is the second preset opening degree interval, the current opening degree is moderate, the condition that sudden increase and sudden decrease of the refrigerant in the air conditioning system occur is less, namely the linearity of the flow characteristic of the refrigerant tends to be stable, the pressure change of the second outlet of the economizer is small, so that the change of the refrigerant quantity flowing into the compressor through the second outlet of the economizer is small, the change of the superheat degree of the system is small, namely the influence of the refrigerant quantity on the stability of the system is not very sensitive, the first valve is controlled to increase the opening degree according to the moderate second speed threshold value, or the first valve is controlled to decrease the opening degree according to the moderate second speed threshold value, the refrigerant circulation quantity of the main loop is stably increased or stably decreased, and the heating capacity of the system is rapidly improved while the stability of the heating capacity of the system is ensured.

On the other hand, when the opening interval to which the current opening belongs is the third preset opening interval, the current opening is larger, the operation of the refrigerant in the air-conditioning system is more stable, namely the flow characteristic of the refrigerant is better in linearity, the pressure at the second outlet of the economizer tends to be stable, so that the change of the amount of the refrigerant flowing into the compressor through the second outlet of the economizer is very small, the superheat degree of the system tends to be stable, namely the influence of the amount of the refrigerant on the stability of the system is insensitive, and then the first valve is controlled to increase the opening according to the larger third speed threshold value, or the first valve is controlled to decrease the opening according to the larger third speed threshold value, so that the refrigerant circulation amount of the main loop is rapidly increased or rapidly decreased, the heating capacity of the air-conditioning system is rapidly improved, and the heating capacity is more stable. Specifically, the first speed threshold is 4P/20s, i.e., 4 steps are adjusted every 20 seconds; the second speed threshold is 8P/20s, namely 8 steps are adjusted every 20 seconds; the third speed threshold is 12P/20s, i.e. 12 steps are adjusted every 20 seconds, it being understood that the first, second, third speed thresholds may be other speed thresholds that meet the requirements.

Furthermore, the maximum opening of the first valve is M, and by reasonably setting the first preset opening interval to be 0.2M to 0.4M, the second preset opening interval to be 0.4M to 0.7M, and the third preset opening interval to be 0.7M to 1.0M, it can be ensured that the current opening of the first valve can belong to any one of the first preset interval, the second preset interval, and the third preset interval, so that the first valve is adjusted to increase the opening or decrease the opening according to the working speed adapted to the current opening, and meanwhile, the first preset opening interval, the second preset opening interval, and the third preset opening interval are reasonably within a range, which is beneficial to reducing the volatility of the air conditioning system, improving the stability of low-temperature heating of the air conditioning system and the reliability of enthalpy increase, and ensuring good heating capability, and is suitable for popularization and application.

Specifically, the range of the exhaust superheat threshold value is 20-25 ℃, wherein the exhaust superheat threshold value can be set according to the actual performance of the compressor, the reasonable range of the exhaust superheat threshold value enables the performance of the compressor to be matched with the energy efficiency, the effectiveness of enthalpy increase of refrigerant injection is improved, the heating capacity is improved, and the reliability of the compressor is improved. It is understood that the exhaust superheat threshold may be other ranges that meet the requirements, with the exhaust superheat threshold being 20 ℃, 22 ℃, 25 ℃.

Example 12:

in an embodiment of the present invention, on the basis of any one of the above embodiments 8 to 11, further, the method further includes: controlling the opening degree of the first valve to be greater than or equal to a fourth opening degree threshold value, wherein the ratio range of the fourth opening degree threshold value to the maximum opening degree of the first valve is as follows: 0.2 to 0.3.

In this embodiment, by controlling the opening degree of the first valve to be greater than or equal to the fourth opening degree threshold, a ratio of the fourth opening degree threshold to the maximum opening degree of the first valve is in a range from 0.2 to 0.3, that is, the fourth opening degree threshold is in a range from 0.2M to 0.3M, that is, the minimum opening degree of the first valve is in a range from 0.2M to 0.3M, where M is the maximum opening degree of the first valve, the current opening degree of the first valve is always greater than or equal to the minimum opening degree of the first valve, and thus, the problem of system reliability caused by a very fast change speed of flow characteristics of a refrigerant due to a very small current opening degree of the first valve, an obvious sudden increase and sudden decrease of the refrigerant, a very large pressure change at the second outlet of the economizer, a very large change of amount of refrigerant flowing into the compressor through the second outlet of the economizer, and a very large change of superheat degree of the system, that is large in system fluctuation is avoided. This application is favorable to improving the stability of system's ability of heating through the minimum aperture (fourth aperture threshold value) of reasonable setting first valve, prolongs air conditioning system's life

Example 13:

according to a third aspect of the present invention, there is provided a computer-readable storage medium having stored thereon a computer program which, when executed, implements the steps of the control method of the air conditioning system 500 as described in any one of the embodiments of the first aspect above; therefore, all the advantageous technical effects of the control method of the air conditioning system 500 according to any of the embodiments of the second aspect are not described herein.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

As shown in fig. 1 and 2, the air conditioning system 500 provided by the present invention includes: the air conditioner includes a compressor 510, an outdoor heat exchanger 520, an air conditioner end equipment 530, an economizer 540, a first valve 550 and a second valve 560, wherein the economizer 540 is a subcooler 5402 or a flash evaporator 5404, the air conditioner end equipment 530 is positioned between pipelines A and B of the air conditioning system 500 shown in FIG. 2, namely, the inlet end 512 of the compressor 510 is communicated with the outdoor heat exchanger 520, the outlet end 514 of the compressor 510 is communicated with the air conditioner end equipment 530, the inlet 546 of the economizer 540 is communicated with the air conditioner end equipment 530, the first outlet 542 of the economizer 540 is communicated with the outdoor heat exchanger 520, the second outlet 544 of the economizer 540 is communicated with the compressor 510, the first valve 550 is positioned on a pipeline between the first outlet 542 and the outdoor heat exchanger 520, and the second valve 560 is positioned on a pipeline between the second outlet 544 and the compressor 510.

When the economizer 540 is the subcooler 5402, the subcooler 5402 further comprises a connecting port 5406, the connecting port 5406 is communicated with the second outlet 544, and the inlet 546 is communicated with the first outlet 542, on one hand, as shown in fig. 3, the connecting port 5406 of the subcooler 5402 is communicated with a pipeline between the air-conditioning terminal equipment 530 and the inlet 546, that is, the connecting port 5406 is located upstream of the subcooler 5402; on the other hand, as shown in fig. 4, the connection port 5406 communicates with the first outlet 542, that is, the connection port 5406 communicates with a pipe between the first outlet 542 of the subcooler 5402 and the outdoor heat exchanger 520, that is, the connection port 5406 is located downstream of the subcooler 5402. Namely, the subcooler 5402 has four ports of a first outlet 542, a second outlet 544, an inlet 546, and a connection port 5406.

As shown in fig. 5, when the economizer 540 is a flash evaporator 5404, the inlet 546 is communicated with the first outlet 542, and the inlet 546 is communicated with the second outlet 544, that is, the refrigerant flowing in through the inlet 546 can flow out through the first outlet 542 and the second outlet 544, that is, the flash evaporator 5404 has three ports, that is, the first outlet 542, the second outlet 544 and the inlet 546.

Specifically, fig. 10 shows a control method of an air conditioning system of a fifth embodiment of the present invention, the control method of the air conditioning system including:

step S702, determining whether the second valve can pass through the refrigerant based on the heating mode, if so, performing step S704, otherwise, performing step S716;

step S704, acquiring the exhaust superheat degree;

step S706, judging whether the exhaust superheat degree is larger than an exhaust superheat degree threshold value, if so, executing step S708, otherwise, executing step S710;

step S708, controlling the first valve to decrease the opening degree;

step S710, judging whether the exhaust superheat degree is smaller than an exhaust superheat degree threshold value, if so, executing step S712, otherwise, executing step 714;

step S712, controlling the first valve to increase the opening degree;

step S714, controlling the first valve to maintain the current opening;

step S716, other control logic.

The control method of the air conditioning system includes the steps of firstly, judging whether a second valve can be communicated with a refrigerant or not in a heating mode, specifically, in a low-temperature environment heating mode, namely, whether the second valve is communicated with a refrigerant passage between an economizer and a compressor or not, specifically, judging whether the opening degree of an electronic expansion valve is larger than 0P or not when the second valve is the electronic expansion valve, and judging whether the second valve is opened or not if the second valve is an electromagnetic valve. And when the second valve is opened, namely the refrigerant can pass through, acquiring the exhaust superheat degree, otherwise, executing other control logics, wherein the other control logics are other conventional control logics of the air conditioning system. Then, under the condition that the second valve is opened, whether the exhaust superheat degree is larger than an exhaust superheat degree threshold value is judged, for example, the exhaust superheat degree threshold value is 20-25 ℃, if the exhaust superheat degree is larger than the exhaust superheat degree threshold value, the first valve is controlled to reduce the opening degree, otherwise, whether the exhaust superheat degree is smaller than the exhaust superheat degree threshold value is continuously judged, if the exhaust superheat degree is smaller than the exhaust superheat degree threshold value, the first valve is controlled to increase the opening degree, otherwise, the exhaust superheat degree is equal to the exhaust superheat degree threshold value, and the opening degree of the first valve is maintained unchanged.

Further, when the second valve is judged to be capable of passing through the refrigerant, the minimum opening degree of the first valve needs to be limited, the current opening degree of the first valve is smaller than a fourth opening degree threshold value, namely the fourth opening degree threshold value is the minimum opening degree, and the minimum opening degree range is 20% -30% of the maximum opening degree.

Further, when the second valve is judged to be capable of passing the refrigerant, different working speeds for adjusting the opening degree of the first valve are set according to the current opening degree of the first valve. Specifically, three steps are divided: when the current opening degree of the first valve belongs to a first preset opening degree interval, for example, the maximum opening degree of the first valve is M, and the first preset opening degree interval is 20% M to 40% M, setting the adjusting speed as a first speed threshold; when the current opening degree of the first valve belongs to a second preset opening degree interval, for example, the second preset opening degree interval is 40M-70% M, setting the adjusting speed as a second speed threshold; when the current opening degree of the first valve belongs to a third preset opening degree interval, for example, the third preset opening degree interval is 70% M to 100% M, the adjustment speed is set to a third speed threshold, wherein the first speed threshold < the second speed threshold < the third speed threshold. Therefore, the working speed of the opening degree of the first valve is adjusted to be matched with the current opening degree of the first valve, namely the first valve is controlled to reduce the opening degree according to the working speed matched with the current opening degree, or the first valve is controlled to increase the opening degree according to the working speed matched with the current opening degree, so that the fluctuation of the refrigerant quantity of the air-conditioning system is avoided to be large, the stability of the heating capacity of the air-conditioning system is improved, and the reliability of the air-conditioning system is improved.

The control method of the air conditioning system provided by the application can still greatly increase the amount of the refrigerant flowing into the compressor through the economizer under the condition of ultralow-temperature heating, thereby improving the refrigerant circulation amount of the air conditioning system, reducing the exhaust superheat degree, improving the heating effect of the air conditioner, further solving the problem that the exhaust superheat degree is too high under the condition of low-temperature heating in the related technology, and further reducing the due heating capacity of the system due to the frequency limitation of the compressor of the system.

Specifically, the first valve is a solenoid valve or an expansion valve, and the second valve is a solenoid valve or an expansion valve.

In the description of the present invention, the terms "plurality" or "a plurality" refer to two or more, and unless otherwise specifically defined, the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In the present invention, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.