阅读说明：本技术 室外换热器、空调系统及其控制方法 (Outdoor heat exchanger, air conditioning system and control method thereof ) 是由 李旭 毛守博 任滔 夏鹏 焦华 卢大海 何建奇 *** 于 2019-10-09 设计创作，主要内容包括：本发明涉及空调技术领域,具体涉及一种室外换热器、空调系统及其控制方法。本发明旨在解决在空调制冷的情况下,室外换热器存在的上部换热管路和下部换热管路之间容易形成偏流的问题。为此目的,本发明在空调制冷的情况下,第一换热管路中的冷媒通过第一膨胀阀进入过冷换热管路中,第二换热管路中的冷媒通过第二膨胀阀上并联的第一通断阀进入过冷换热管路中。并根据第一换热管路和第二换热管路的制冷效果的差异,利用第一膨胀阀对第一换热管路中的冷媒进行流量调节,从而可以减少或者避免第一换热管路和第二换热管路之间形成偏流,并提高了室外换热器的利用效率和空调的制冷效果。(The invention relates to the technical field of air conditioners, in particular to an outdoor heat exchanger, an air conditioning system and a control method of the outdoor heat exchanger. The invention aims to solve the problem that bias flow is easily formed between an upper heat exchange pipeline and a lower heat exchange pipeline of an outdoor heat exchanger under the condition of air-conditioning refrigeration. For this purpose, under the condition of air conditioning refrigeration, the refrigerant in the first heat exchange pipeline enters the supercooling heat exchange pipeline through the first expansion valve, and the refrigerant in the second heat exchange pipeline enters the supercooling heat exchange pipeline through the first on-off valve connected in parallel with the second expansion valve. And according to the difference of the refrigeration effect of the first heat exchange pipeline and the second heat exchange pipeline, the first expansion valve is utilized to adjust the flow of the refrigerant in the first heat exchange pipeline, so that the bias current formed between the first heat exchange pipeline and the second heat exchange pipeline can be reduced or avoided, and the utilization efficiency of the outdoor heat exchanger and the refrigeration effect of the air conditioner are improved.)

1. An outdoor heat exchanger, characterized in that:

the system comprises a first heat exchange pipeline, a second heat exchange pipeline and a supercooling heat exchange pipeline, wherein the first heat exchange pipeline is connected with the second heat exchange pipeline in parallel, a first end of the first heat exchange pipeline and a first end of the second heat exchange pipeline are both used for connecting a compressor, a second end of the first heat exchange pipeline is connected with the first end of the supercooling heat exchange pipeline through a first expansion valve, a second end of the second heat exchange pipeline is connected with the first end of the supercooling heat exchange pipeline through a second expansion valve, and the second end of the supercooling heat exchange pipeline is used for connecting an indoor heat exchanger;

the first on-off valve is connected with the second expansion valve in parallel; and the first on-off valve is set to be conducted when the refrigerant flows from the second heat exchange pipeline to the supercooling heat exchange pipeline and cut off when the refrigerant flows from the supercooling heat exchange pipeline to the second heat exchange pipeline.

2. The outdoor heat exchanger of claim 1, wherein:

the temperature sensor also comprises a first temperature sensor and a second temperature sensor;

the first temperature sensor is arranged on the first heat exchange pipeline and used for monitoring the temperature of the first heat exchange pipeline;

the second temperature sensor is arranged on the second heat exchange pipeline and used for monitoring the temperature of the second heat exchange pipeline.

3. The outdoor heat exchanger of claim 1, wherein:

the supercooling heat exchange pipeline is connected with the first on-off valve in parallel; and the second on-off valve is set to be on when the refrigerant flows from the indoor heat exchanger to the first expansion valve and the second expansion valve, and to be off when the refrigerant flows from the first expansion valve and the second expansion valve to the indoor heat exchanger.

4. The outdoor heat exchanger of claim 3, wherein:

the second on-off valve is a one-way valve, and the resistance coefficient of the one-way valve is smaller than that of the supercooling heat exchange pipeline.

5. The outdoor heat exchanger of claim 4, wherein:

the ratio of the resistance coefficient of the one-way valve to the resistance coefficient of the supercooling heat exchange pipeline is 1: 81.

6. An air conditioning system characterized by:

the heat exchanger comprises a compressor, an indoor heat exchanger, a throttling device and an outdoor heat exchanger as claimed in any one of claims 1-5;

the first end of the first heat exchange pipeline and the first end of the second heat exchange pipeline are both connected with the first end of the compressor, and the second end of the supercooling heat exchange pipeline is connected with the first end of the indoor heat exchanger through the throttling device; the second end of the indoor heat exchanger is connected with the second end of the compressor.

7. A control method of an air conditioning system, the air conditioning system including an indoor heat exchanger and an outdoor heat exchanger; the outdoor heat exchanger comprises a first heat exchange pipeline, a second heat exchange pipeline and a supercooling heat exchange pipeline, and the first heat exchange pipeline is connected with the second heat exchange pipeline in parallel; the first heat exchange pipeline is connected with the first end of the supercooling heat exchange pipeline through a first expansion valve, and the second heat exchange pipeline is connected with the first end of the supercooling heat exchange pipeline through a second expansion valve; the second end of the supercooling heat exchange pipeline is connected with the indoor heat exchanger through a throttling device; the air conditioning system also comprises a first on-off valve which is connected with the second expansion valve in parallel; the first on-off valve is set to be turned on when the refrigerant flows from the second heat exchange pipeline to the supercooling heat exchange pipeline and cut off when the refrigerant flows from the supercooling heat exchange pipeline to the second heat exchange pipeline; the control method is characterized by comprising the following steps:

under a refrigeration mode, respectively acquiring a first temperature of the first heat exchange pipeline, a second temperature of the second heat exchange pipeline and an outdoor environment temperature;

comparing the first temperature and the second temperature with the outdoor environment temperature respectively;

and selectively controlling the first expansion valve based on the comparison result so as to balance the refrigeration effects of the first heat exchange pipeline and the second heat exchange pipeline.

8. The control method of claim 7, wherein the step of selectively controlling the first expansion valve based on the result of the comparison comprises:

and if the first temperature or the second temperature is lower than the outdoor environment temperature, adjusting the first expansion valve.

9. The control method of claim 8, wherein the method of adjusting the first expansion valve comprises:

if the first temperature is higher than the second temperature, reducing the opening degree of the first expansion valve until the first temperature is equal to the second temperature;

and/or if the first temperature is less than the second temperature, increasing the opening degree of the first expansion valve until the first temperature is equal to the second temperature.

10. The control method of claim 7, the air conditioning system further comprising a second cut-off valve connected in parallel with the subcooling heat exchange line; the second on-off valve is set to be on when the refrigerant flows from the indoor heat exchanger to the first expansion valve and the second expansion valve, and to be off when the refrigerant flows from the first expansion valve and the second expansion valve to the indoor heat exchanger; characterized in that the control method further comprises:

and in the heating mode, the flow proportion of the refrigerant which is distributed to the supercooling heat exchange pipeline by the indoor heat exchanger and the second on-off valve is controlled, so that the flow of the refrigerant in the supercooling heat exchange pipeline is smaller than that of the refrigerant in the second on-off valve.

Technical Field

The invention relates to the technical field of air conditioners, in particular to an outdoor heat exchanger, an air conditioning system and a control method of the outdoor heat exchanger.

Background

The air conditioner mainly comprises four parts of a compressor, an indoor heat exchanger, a throttling device and an outdoor heat exchanger. The first end of the outdoor heat exchanger is connected with the indoor heat exchanger through the compressor, and the second end of the outdoor heat exchanger is connected with the indoor heat exchanger through the throttling device. When the air conditioner refrigerates, the outdoor heat exchanger is used as a condenser to perform condensation, and the indoor heat exchanger is used as an evaporator to perform evaporation; when the air conditioner heats, the outdoor heat exchanger is used as an evaporator to perform an evaporation function, and the indoor heat exchanger is used as a condenser to perform a condensation function.

An existing outdoor heat exchanger includes an upper heat exchange pipeline, a lower heat exchange pipeline, and a supercooling heat exchange pipeline. The upper heat exchange pipeline and the lower heat exchange pipeline are connected in parallel to operate, the refrigerant is pressed into the upper heat exchange pipeline and the lower heat exchange pipeline respectively by the compressor to be split, and then the refrigerant is converged in the supercooling heat exchange pipeline and enters the indoor heat exchanger. The bypass pipeline between the upper heat exchange pipeline and the supercooling heat exchange pipeline is provided with a first expansion valve and a first one-way valve which are connected in parallel, and the bypass pipeline between the lower heat exchange pipeline and the supercooling heat exchange pipeline is provided with a second expansion valve and a second one-way valve which are connected in parallel, so that the bypass control of the upper heat exchange pipeline and the lower heat exchange pipeline is realized.

However, the structure of the outdoor heat exchanger has the following disadvantages: under the condition of air conditioner refrigeration, the first expansion valve and the second expansion valve are generally in a fully opened state, namely the opening degrees of the first expansion valve and the second expansion valve are the same, at the moment, the first expansion valve and the second expansion valve cannot play an effective shunting regulation role, and the resistance characteristics of the first one-way valve and the second one-way valve are difficult to keep consistent, so that bias flow is formed between the upper heat exchange pipeline and the lower heat exchange pipeline, the utilization efficiency of the outdoor heat exchanger is reduced, and further the refrigeration effect of the air conditioner is adversely affected.

Accordingly, there is a need in the art for a new outdoor heat exchanger, air conditioning system and method of controlling the same to solve the above-mentioned problems.

Disclosure of Invention

The invention provides an outdoor heat exchanger, an air conditioning system and a control method thereof, aiming at solving the problems in the prior art that under the condition of air conditioning refrigeration, bias flow is easily formed between an upper heat exchange pipeline and a lower heat exchange pipeline of the outdoor heat exchanger, so that the utilization efficiency of the outdoor heat exchanger is reduced, and further the refrigeration effect of an air conditioner is adversely affected.

Firstly, the embodiment provides an outdoor heat exchanger, where the outdoor heat exchanger includes a first heat exchange pipeline, a second heat exchange pipeline, and a supercooling heat exchange pipeline, the first heat exchange pipeline is connected in parallel with the second heat exchange pipeline, both a first end of the first heat exchange pipeline and a first end of the second heat exchange pipeline are used to connect a compressor, a second end of the first heat exchange pipeline is connected with the first end of the supercooling heat exchange pipeline through a first expansion valve, a second end of the second heat exchange pipeline is connected with the first end of the supercooling heat exchange pipeline through a second expansion valve, and the second end of the supercooling heat exchange pipeline is used to connect an indoor heat exchanger; the outdoor heat exchanger also comprises a first on-off valve which is connected with the second expansion valve in parallel; and the first on-off valve is set to be conducted when the refrigerant flows from the second heat exchange pipeline to the supercooling heat exchange pipeline and cut off when the refrigerant flows from the supercooling heat exchange pipeline to the second heat exchange pipeline.

As a preferable technical solution of the outdoor heat exchanger provided in the above embodiment, the outdoor heat exchanger further includes a first temperature sensor and a second temperature sensor; the first temperature sensor is arranged on the first heat exchange pipeline and used for monitoring the temperature of the first heat exchange pipeline; the second temperature sensor is arranged on the second heat exchange pipeline and used for monitoring the temperature of the second heat exchange pipeline.

As a preferable technical solution of the outdoor heat exchanger provided in the above embodiment, the outdoor heat exchanger further includes a second on-off valve, and the second on-off valve is connected in parallel with the supercooling heat exchange pipeline; and the second on-off valve is set to be on when the refrigerant flows from the indoor heat exchanger to the first expansion valve and the second expansion valve, and to be off when the refrigerant flows from the first expansion valve and the second expansion valve to the indoor heat exchanger.

As a preferable technical solution of the outdoor heat exchanger provided in the above embodiment, the second cut-off valve is a check valve, and a resistance coefficient of the check valve is smaller than a resistance coefficient of the supercooling heat exchange pipeline.

As a preferable technical solution of the outdoor heat exchanger provided in the above embodiment, a ratio of a resistance coefficient of the check valve to a resistance coefficient of the supercooling heat exchange pipeline is 1: 81.

In addition, the embodiment also provides an air conditioning system using the outdoor heat exchanger, wherein the air conditioning system comprises a compressor, an indoor heat exchanger, a throttling device and any outdoor heat exchanger as described above; the first end of the first heat exchange pipeline and the first end of the second heat exchange pipeline are both connected with the first end of the compressor, and the second end of the supercooling heat exchange pipeline is connected with the first end of the indoor heat exchanger through the throttling device; the second end of the indoor heat exchanger is connected with the second end of the compressor.

Finally, the embodiment also provides a control method of the air conditioning system, wherein the air conditioning system comprises an indoor heat exchanger and an outdoor heat exchanger; the outdoor heat exchanger comprises a first heat exchange pipeline, a second heat exchange pipeline and a supercooling heat exchange pipeline, and the first heat exchange pipeline is connected with the second heat exchange pipeline in parallel; the first heat exchange pipeline is connected with the first end of the supercooling heat exchange pipeline through a first expansion valve, and the second heat exchange pipeline is connected with the first end of the supercooling heat exchange pipeline through a second expansion valve; the second end of the supercooling heat exchange pipeline is connected with the indoor heat exchanger through a throttling device; the air conditioning system also comprises a first on-off valve which is connected with the second expansion valve in parallel; the first on-off valve is set to be turned on when the refrigerant flows from the second heat exchange pipeline to the supercooling heat exchange pipeline and cut off when the refrigerant flows from the supercooling heat exchange pipeline to the second heat exchange pipeline; the control method is characterized by comprising the following steps: under a refrigeration mode, respectively acquiring a first temperature of the first heat exchange pipeline, a second temperature of the second heat exchange pipeline and an outdoor environment temperature; comparing the first temperature and the second temperature with the outdoor environment temperature respectively; and selectively controlling the first expansion valve based on the comparison result so as to balance the refrigeration effects of the first heat exchange pipeline and the second heat exchange pipeline.

As a preferable aspect of the control method according to the above-described embodiment, the step of selectively controlling the first expansion valve based on the result of the comparison includes: and if the first temperature or the second temperature is lower than the outdoor environment temperature, adjusting the first expansion valve.

As a preferable aspect of the control method provided in the above embodiment, the method for adjusting the first expansion valve includes: if the first temperature is higher than the second temperature, reducing the opening degree of the first expansion valve until the first temperature is equal to the second temperature; and/or if the first temperature is less than the second temperature, increasing the opening degree of the first expansion valve until the first temperature is equal to the second temperature.

As a preferable technical solution of the control method provided in the foregoing embodiment, the air conditioning system further includes a second on-off valve, and the second on-off valve is connected in parallel with the supercooling heat exchange pipeline; the second on-off valve is set to be on when the refrigerant flows from the indoor heat exchanger to the first expansion valve and the second expansion valve, and to be off when the refrigerant flows from the first expansion valve and the second expansion valve to the indoor heat exchanger; characterized in that the control method further comprises: and in the heating mode, the flow proportion of the refrigerant which is distributed to the supercooling heat exchange pipeline by the indoor heat exchanger and the second on-off valve is controlled, so that the flow of the refrigerant in the supercooling heat exchange pipeline is smaller than that of the refrigerant in the second on-off valve.

In the outdoor heat exchanger, the air conditioning system and the control method thereof, the first heat exchange pipeline is connected with the supercooling heat exchange pipeline through the first expansion valve, and the second heat exchange pipeline is connected with the supercooling heat exchange pipeline through the second expansion valve and the first on-off valve which are connected in parallel. Under the condition of air conditioning refrigeration, the refrigerant in the first heat exchange pipeline enters the supercooling heat exchange pipeline through the first expansion valve, and the refrigerant in the second heat exchange pipeline enters the supercooling heat exchange pipeline through the first on-off valve connected with the second expansion valve in parallel. And according to the difference of the refrigeration effect of the first heat exchange pipeline and the second heat exchange pipeline, the first expansion valve is utilized to adjust the flow of the refrigerant in the first heat exchange pipeline, so that the bias current formed between the first heat exchange pipeline and the second heat exchange pipeline can be reduced or avoided, and the utilization efficiency of the outdoor heat exchanger and the refrigeration effect of the air conditioner are improved.

In addition, the invention further arranges a second on-off valve in parallel on the supercooling pipeline, under the condition of air-conditioning heating, the refrigerant flowing out from the indoor heat exchanger mainly enters the first expansion valve and the second expansion valve through the second on-off valve, thus reducing the heat loss when the refrigerant enters the outdoor heat exchanger from the indoor heat exchanger; on the other hand, a small amount of refrigerant flows into the supercooling heat exchange pipeline to be condensed and released, and the heat released by the supercooling heat exchange pipeline is utilized to prevent the second heat exchange pipeline from being frozen, so that the heating efficiency of the outdoor heat exchanger is ensured.

Drawings

The outdoor heat exchanger, the air conditioning system and the control method thereof of the present invention will be described below with reference to the accompanying drawings. In the drawings:

fig. 1 is a schematic structural view of an outdoor heat exchanger according to the present embodiment;

fig. 2 is a flowchart illustrating a control method of the air conditioning system according to the present embodiment;

list of reference numerals

1-a first heat exchange circuit; 2-a second heat exchange line; 3-a super-cooling heat exchange pipeline; 4-a first expansion valve; 5-a second expansion valve; 6-a first on-off valve; 7-a second on-off valve; 8-a first temperature sensor; 9-a second temperature sensor; 10-a third temperature sensor; 11-fourth temperature sensor.

Detailed Description

Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. For example, the present embodiment describes the control of the first heat exchange line and the second heat exchange line in the outdoor heat exchanger by the combination of the on-off valve and the expansion valve, but this is not intended to limit the scope of the present invention, and those skilled in the art can apply the present invention to outdoor heat exchangers or indoor heat exchangers having three or more heat exchange lines without departing from the principle of the present invention.

It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The invention provides an outdoor heat exchanger, an air conditioning system and a control method thereof, aiming at solving the problems that under the condition of air conditioning refrigeration, bias flow is easily formed between an upper heat exchange pipeline and a lower heat exchange pipeline of the outdoor heat exchanger, so that the utilization efficiency of the outdoor heat exchanger is reduced, and further the refrigeration effect of an air conditioner is adversely affected.

As shown in fig. 1, firstly, the present embodiment provides an outdoor heat exchanger, where the outdoor heat exchanger includes a first heat exchange pipeline 1, a second heat exchange pipeline 2, and a supercooling heat exchange pipeline 3, the first heat exchange pipeline 1 is connected in parallel with the second heat exchange pipeline 2, a first end of the first heat exchange pipeline 1 and a first end of the second heat exchange pipeline 2 are both used to connect a compressor (not shown in the figure), a second end of the first heat exchange pipeline 1 is connected with a first end of the supercooling heat exchange pipeline 3 through a first expansion valve 4, a second end of the second heat exchange pipeline 2 is connected with a first end of the supercooling heat exchange pipeline 3 through a second expansion valve 5, and a second end of the supercooling heat exchange pipeline 3 is used to connect an indoor heat exchanger (not shown in the figure); the outdoor heat exchanger also comprises a first on-off valve 6, and the first on-off valve 6 is connected with the second expansion valve 5 in parallel; and the first on-off valve 6 is set to be turned on when the refrigerant flows from the second heat exchange pipeline 2 to the supercooling heat exchange pipeline 3 and to be turned off when the refrigerant flows from the supercooling heat exchange pipeline 3 to the second heat exchange pipeline 2.

Illustratively, the outdoor heat exchanger and the indoor heat exchanger (not shown) in the present embodiment each include two states, a condenser and an evaporator. When the air conditioner refrigerates, the outdoor heat exchanger is used as a condenser, and the indoor heat exchanger is used as an evaporator; when the air conditioner heats, the outdoor heat exchanger is used as an evaporator, and the indoor heat exchanger (not shown) is used as a condenser. The gaseous refrigerant is liquefied in the condenser and releases heat to the outside to be changed into liquid, and the pressure of the refrigerant in the condenser is generally higher; the liquid refrigerant is vaporized in the evaporator to absorb the external heat and turns into a gas state, and the pressure of the refrigerant in the evaporator is generally lower.

When the resistance of the second heat exchange pipeline 2 is greater than the resistance of the first heat exchange pipeline 1, the refrigerant in the second heat exchange pipeline 2 can directly enter the supercooling heat exchange pipeline 3 through the first on-off valve 6 in the air-conditioning refrigeration mode. At this time, although the refrigerant in the second heat exchange pipeline 2 does not pass through the throttling of the second expansion valve 5, due to the resistance action of the second heat exchange pipeline 2, the refrigerant in the first heat exchange pipeline 1 can reach the same resistance effect as the second heat exchange pipeline 2 only by the throttling action of the first expansion valve 4, and further the flow balance between the first heat exchange pipeline 1 and the second heat exchange pipeline 2 can be realized by adjusting the first expansion valve 4.

It will be understood by those skilled in the art that when the resistance of the first heat exchange line 1 is greater than that of the second heat exchange line 2, the first on-off valve 6 may be changed to be disposed in parallel with the first expansion valve 4, so that the same effects as those described above can be achieved.

When the air conditioner refrigerates, the outdoor heat exchanger is used as a condenser, the refrigerant in the first heat exchange pipeline 1 enters the supercooling heat exchange pipeline 3 through the first expansion valve 4 for secondary condensation, and the refrigerant in the second heat exchange pipeline 2 mainly enters the supercooling heat exchange pipeline 3 through the first on-off valve 6 for secondary condensation. Therefore, the throttling adjustment of the refrigerant in the first heat exchange pipeline 1 can be realized by adjusting the opening degree of the first expansion valve 4, and the bias current generated between the first heat exchange pipeline 1 and the second heat exchange pipeline 2 is reduced or avoided, so that the refrigeration effects of the first heat exchange pipeline 1 and the second heat exchange pipeline 2 tend to be consistent. And further, the refrigeration balance of the first heat exchange pipeline 1 and the second heat exchange pipeline 2 and the overall refrigeration performance of the outdoor heat exchanger are improved.

When the air conditioner heats, the first heat exchange pipeline 1 and the second heat exchange pipeline 2 in the outdoor heat exchanger are used as evaporators, and liquid refrigerants respectively enter the first heat exchange pipeline 1 and the second heat exchange pipeline 2 through the throttling action of the first expansion valve 4 and the second expansion valve 5 to evaporate and absorb heat and become gaseous refrigerants. In the process, the opening degrees of the first expansion valve 4 and the second expansion valve 5 can be adjusted according to the evaporating temperature of the refrigerant in the outdoor heat exchanger and the temperature of the air outlet pipe of the outdoor heat exchanger, so that the evaporating temperatures in the first heat exchange pipeline 1 and the second heat exchange pipeline 2 are kept consistent as much as possible, bias current generated between the first heat exchange pipeline 1 and the second heat exchange pipeline 2 can be reduced or avoided, and the refrigerating balance of the first heat exchange pipeline 1 and the second heat exchange pipeline 2 and the overall heating performance of the outdoor heat exchanger are improved.

As a preferable implementation of the outdoor heat exchanger provided in the above embodiment, the outdoor heat exchanger further includes a first temperature sensor 8 and a second temperature sensor 9; the first temperature sensor 8 is arranged on the first heat exchange pipeline 1 and used for monitoring the temperature of the first heat exchange pipeline 1; a second temperature sensor 9 is arranged on the second heat exchange line 2 for monitoring the temperature of the second heat exchange line 2.

For example, the first temperature sensor 8 may be a defrosting temperature sensor disposed on the first heat exchange line 1; the second temperature sensor 9 may be a defrost temperature sensor provided on the second heat exchange line 2. During heating, frost may form on the first heat exchange pipeline 1 and the second heat exchange pipeline 2. According to the temperature monitoring of the first heat exchange pipeline 1 and the second heat exchange pipeline 2 and the throttle control of the first expansion valve 4 and the second expansion valve 5, the first heat exchange pipeline 1 and the second heat exchange pipeline 2 can be frosted in a balanced mode, the evaporation capacity of the first heat exchange pipeline 1 and the evaporation capacity of the second heat exchange pipeline 2 can be kept consistent as much as possible, and meanwhile the defrosting condition is achieved. Therefore, the evaporation capacity of the first heat exchange pipeline 1 and the evaporation capacity of the second heat exchange pipeline 2 are fully utilized, and the heating effect of the outdoor heat exchanger is improved.

It will be understood by those skilled in the art that the above embodiment has the first temperature sensor 8 disposed on the first heat exchange pipeline 1 and the second temperature sensor 9 disposed on the second heat exchange pipeline 2, so as to determine the condensation effect or evaporation effect of the first heat exchange pipeline 1 and the second heat exchange pipeline 2 by detecting the temperature of the first heat exchange pipeline 1 and the second heat exchange pipeline 2. However, the protection scope of the present invention is not limited to the disclosure of the above embodiments, and a person skilled in the art may make various adjustments and combinations to the above-mentioned manner for determining the cooling or heating effect of the first heat exchange pipeline 1 and the second heat exchange pipeline 2 without departing from the principle of the present invention for performing balanced control on the cooling and heating of the first heat exchange pipeline 1 and the second heat exchange pipeline 2 of the outdoor heat exchanger, so that the present invention can be applied to more specific application scenarios.

For example, pressure gauges may be installed on refrigerant coils that determine the first heat exchange pipeline 1 and the second heat exchange pipeline 2 to detect and determine the condensing pressure or the evaporating pressure of the first heat exchange pipeline 1 and the second heat exchange pipeline 2, and then determine whether the refrigerants in the first heat exchange pipeline 1 and the second heat exchange pipeline 2 have bias flow and whether the condensing effect has difference, so as to control the flow of the refrigerants in the first heat exchange pipeline 1 and the second heat exchange pipeline 2 through the first expansion valve 4 or the second expansion valve 5 according to the difference of indexes such as temperature and pressure of the first heat exchange pipeline 1 and the second heat exchange pipeline 2, and further implement balanced cooling or heating of the first heat exchange pipeline 1 and the second heat exchange pipeline 2, and simultaneously improve the cooling or heating performance of the outdoor heat exchanger.

For another example, a third temperature sensor 10 may be disposed on the air outlet pipe of the first heat exchange pipe 1, and a fourth temperature sensor 11 may be disposed on the air outlet pipe of the second heat exchange pipe 2; the air outlet pipeline refers to a refrigerant pipeline connected with the air outlet ends of the first heat exchange pipeline 1 and the second heat exchange pipeline 2 when the outdoor heat exchanger is used as an evaporator. The first expansion valve 4 and the second expansion valve 5 are adjusted by the difference between the evaporating temperature of the outdoor heat exchanger and the third temperature sensor 10 and the difference between the evaporating temperature of the outdoor heat exchanger and the temperature detected by the fourth temperature sensor 11, so as to control the refrigerant flow in the first heat exchange pipeline 1 and the second heat exchange pipeline 2 and realize the balanced heating of the first heat exchange pipeline 1 and the second heat exchange pipeline 2 when the air conditioner heats.

As a preferable implementation manner of the outdoor heat exchanger provided in the above embodiment, the outdoor heat exchanger further includes a second on-off valve 7, and the second on-off valve 7 is connected in parallel with the supercooling heat exchange pipeline 3; and the second cut-off valve 7 is configured to be opened when the refrigerant flows from the indoor heat exchanger (not shown) to the first expansion valve 4 and the second expansion valve 5, and to be cut off when the refrigerant flows from the first expansion valve 4 and the second expansion valve 5 to the indoor heat exchanger (not shown).

For example, in the case of air-conditioning refrigeration, the outdoor heat exchanger is used as a condenser, the first heat exchange pipeline 1 and the second heat exchange pipeline 2 perform primary condensation on a refrigerant and release heat to the outside, and the supercooling heat exchange pipeline 3 performs secondary condensation on the refrigerant and release heat to the outside as the condenser, so that the overall refrigeration effect of the outdoor heat exchanger is improved.

In the case of heating by an air conditioner, the outdoor heat exchanger is used as an evaporator, and then the refrigerants in the first heat exchange pipeline 1 and the second heat exchange pipeline 2 are evaporated to absorb external heat. When the first heat exchange pipeline 1 is located above the second heat exchange pipeline 2, and the outdoor unit fan is closer to the first heat exchange pipeline 1, the efficiency of heat exchange between the first heat exchange pipeline 1 and the outside is higher than that of the second heat exchange pipeline 2, so that the second heat exchange pipeline 2 is easy to frost or even freeze, and the heating effect of the outdoor heat exchanger is reduced.

The supercooling heat exchange pipeline 3 arranged at the bottom of the second heat exchange pipeline 2 can enable part of the refrigerant to enter the first heat exchange pipeline 1 and the second heat exchange pipeline 2 through the supercooling heat exchange pipeline 3, the refrigerant in the supercooling heat exchange pipeline 3 is condensed to release heat outwards, the frosting degree of the second heat exchange pipeline 2 can be reduced or the defrosting effect of the second heat exchange pipeline 2 is increased by utilizing the heat released by the supercooling heat exchange pipeline 3, and the first heat exchange pipeline 1 and the second heat exchange pipeline 2 are guaranteed to be frosted evenly and heated in a balanced mode.

Under the condition of heating of the air conditioner, the second on-off valve 7 is arranged on the supercooling heat exchange pipeline 3 in parallel, so that on one hand, a small part of refrigerant flowing into the supercooling heat exchange pipeline 3 is ensured to reduce the frosting degree of the second heat exchange pipeline 2 or increase the defrosting effect on the second heat exchange pipeline 2; on the other hand, most of the refrigerant enters the first expansion valve 4 and the second expansion valve 5 from the indoor heat exchanger (not shown) through the second on-off valve 7 for throttling adjustment, so that the large heat loss caused by the fact that the refrigerant completely enters the supercooling heat exchange pipeline 3 is prevented, and the heating effect of the outdoor heat exchanger is guaranteed.

As a preferred implementation of the outdoor heat exchanger provided in the above embodiment, the second cut-off valve 7 is a check valve, and a resistance coefficient of the check valve is smaller than a resistance coefficient of the supercooling heat exchange pipeline 3.

As the second cut-off valve 7, for example, a check valve may be selected, which is configured to be opened when the refrigerant flows from the indoor heat exchanger (not shown) to the first expansion valve 4 and the second expansion valve 5, and to be cut off when the refrigerant flows from the first expansion valve 4 and the second expansion valve 5 to the indoor heat exchanger (not shown).

And, the check valve with the resistance coefficient smaller than that of the supercooling heat exchange pipeline 3 can be selected, so that when the check valve is conducted, the flow of the refrigerant in the check valve is larger than that of the refrigerant in the supercooling heat exchange pipeline 3, the heat loss of the refrigerant in the supercooling heat exchanger 3 is effectively reduced, and the heating effect of the outdoor heat exchanger is further improved.

It will be understood by those skilled in the art that the first on-off valve 6 and the second on-off valve 7 in the above embodiments can be selected as one-way valves to realize the functions of one-way connection and reverse connection. When the check valve is selected as the first on-off valve 6 and the second on-off valve 7, the function that the first on-off valve 6 and the second on-off valve 7 are required to realize can be realized without operation, and the check valve has the advantages of simplicity and practicability.

However, the protection scope of the present invention is not limited to the disclosure of the above embodiments, and those skilled in the art may select other on-off valves without departing from the principle of the present invention for controlling the direction of the refrigerant in the outdoor heat exchanger, so that the present invention can be applied to more specific application scenarios. For example, the first on-off valve 6 and the second on-off valve 7 can also be selected as electromagnetic valves, and the electromagnetic valves are controlled by signals to realize the on-off function.

As a preferable embodiment of the outdoor heat exchanger provided in the above embodiment, a ratio of a resistance coefficient of the check valve as the second cut-off valve 7 to a resistance coefficient of the supercooling heat exchange pipe 3 is 1: 81.

For example, to achieve the purpose of the refrigerant distribution ratio, the resistance coefficient of the check valve may be determined according to the relationship between the mass flow rate in the parallel pipeline and the resistance coefficient, as shown in equation (1):

S₂:S₁＝m₁ ²:m₂ ²(1)

in the above formula (1), S₂Is a resistance coefficient of a check valve as the second cut-off valve 7, S₁Is the resistance coefficient, m, of the supercooling heat exchange pipeline 3₁Is the mass flow m of the refrigerant in the supercooling heat exchange pipeline 3₂Is the mass flow of the refrigerant in the check valve as the second shut-off valve 7.

Under the condition of air-conditioning heating, 10% of refrigerant can pass through the supercooling heat exchange pipeline 3, the temperature of the supercooling heat exchange pipeline 3 is ensured to be above 0 ℃, and the second heat exchange pipeline 2 is further ensured not to be frozen; and 90% of the refrigerant passes through the check valve as the second cut-off valve 7, thereby realizing the distribution of the refrigerant flow. At this time, the ratio of the resistance coefficient of the check valve as the second cut-off valve 7 to the resistance coefficient of the supercooling heat exchange pipe 3, which is calculated according to the formula (1), should be 1:81, and this can be used as a basis for designing or selecting the check valve.

In addition, the embodiment also provides an air conditioning system using the outdoor heat exchanger, wherein the air conditioning system comprises a compressor (not shown in the figure), an indoor heat exchanger (not shown in the figure), a throttling device (not shown in the figure) and any outdoor heat exchanger; the first end of the first heat exchange pipeline 1 and the first end of the second heat exchange pipeline 2 are both connected with the first end of the compressor, and the second end of the supercooling heat exchange pipeline 3 is connected with the first end of the indoor heat exchanger through a throttling device; and the second end of the indoor heat exchanger is connected with the second end of the compressor.

For example, when the outdoor heat exchanger is used in an air conditioning system, the performance of the whole air conditioner is improved due to the excellent heating and cooling performance of the outdoor heat exchanger. Such as:

under the refrigeration condition, the refrigerant flow of the first heat exchange pipeline 1 can be adjusted by adjusting the first expansion valve 4, so that the bias current generated between the first heat exchange pipeline 1 and the second heat exchange pipeline 2 is reduced or avoided, the first heat exchange pipeline 1 and the second heat exchange pipeline 2 are cooled in a balanced manner, and the overall refrigeration effect of the air conditioner is ensured. On the other hand, the refrigerant enters the supercooling heat exchange pipeline 3 to be secondarily condensed, so that the refrigeration effect of the air conditioner can be further improved.

In the outdoor heat exchanger, because the first heat exchange pipeline 1 is closer to the outdoor fan, the frosting of the first heat exchange pipeline 1 is more difficult than the frosting of the second heat exchange pipeline 2, which may cause the difference of the frosting degree between the second heat exchange pipeline 2 and the first heat exchange pipeline 1 to be too large, even the second heat exchange pipeline 2 is frozen, and the overall heating performance of the air conditioner is affected.

In order to avoid the above problems, under the heating condition, most of the refrigerant enters the first expansion valve 4 and the second expansion valve 5 through the second shut-off valve 7 for split-flow adjustment, and a small part of the refrigerant enters the first expansion valve 4 and the second expansion valve 5 through the supercooling heat exchange pipeline 3 arranged at the bottom of the second heat exchange pipeline 2. Therefore, on one hand, the purpose of reducing the frosting degree of the second heat exchange pipeline 2 or increasing the defrosting effect on the second heat exchange pipeline 2 is achieved by enabling a small part of refrigerant to enter the supercooling heat exchange pipeline 3 for condensation and heat release, and the heating effect of the outdoor heat exchanger is further improved; on the other hand, most of the refrigerant enters the first expansion valve 4 and the second expansion valve 5 from the indoor heat exchanger (not shown) through the second on-off valve 7 for throttle control, so that the refrigerant is prevented from causing great heat loss in the supercooling heat exchange pipeline 3, the heating effect of the outdoor heat exchanger is ensured, and the heating effect of the air conditioner is further ensured.

Therefore, when the air conditioner utilizes the outdoor heat exchanger, the refrigerating performance and the heating performance of the air conditioner are greatly improved.

Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims of the present invention, any of the claimed embodiments may be used in any combination.

Finally, the present embodiment further provides a control method of an air conditioning system, as shown in fig. 1, the air conditioning system includes an indoor heat exchanger (not shown in the figure) and an outdoor heat exchanger (not shown in the figure); the outdoor heat exchanger comprises a first heat exchange pipeline 1, a second heat exchange pipeline 2 and a supercooling heat exchange pipeline 3, wherein the first heat exchange pipeline 1 is connected with the second heat exchange pipeline 2 in parallel; the first heat exchange pipeline 1 is connected with the first end of the supercooling heat exchange pipeline 3 through a first expansion valve 4, and the second heat exchange pipeline 2 is connected with the first end of the supercooling heat exchange pipeline 3 through a second expansion valve 5; the second end of the supercooling heat exchange pipeline 3 is connected with an indoor heat exchanger (not shown in the figure) through a throttling device; the air conditioning system also comprises a first on-off valve 6, and the first on-off valve 6 is connected with the second expansion valve 5 in parallel; the first on-off valve 6 is set to be turned on when the refrigerant flows from the second heat exchange pipeline 2 to the supercooling heat exchange pipeline 3 and to be turned off when the refrigerant flows from the supercooling heat exchange pipeline 3 to the second heat exchange pipeline 2; as shown in fig. 2, the control method of the air conditioning system includes:

s100, respectively acquiring a first temperature of a first heat exchange pipeline 1, a second temperature of a second heat exchange pipeline 2 and an outdoor environment temperature in a refrigeration mode;

s200, comparing the first temperature and the second temperature with the outdoor environment temperature respectively;

s300, selectively controlling the first expansion valve 4 based on the comparison result to equalize the refrigeration effects of the first heat exchange pipeline 1 and the second heat exchange pipeline 2.

For example, when the air conditioner is used for cooling, the outdoor heat exchanger is used as a condenser, and the refrigerant in the first heat exchange pipeline 1 and the second heat exchange pipeline 2 releases heat to the external environment, so that the surface temperature of the first heat exchange pipeline 1 and the second heat exchange pipeline 2 can be increased. By detecting the temperature of the surfaces of the first heat exchange line 1 and the second heat exchange line 2, the difference in the refrigeration capacity of the first heat exchange line 1 and the second heat exchange line 2 can be indirectly reflected.

Furthermore, the refrigerant flow in the first heat exchange pipeline 1 is controlled by adjusting the first expansion valve 4, so that the temperatures of the first heat exchange pipeline 1 and the second heat exchange pipeline 2 tend to be the same, the difference of the refrigeration effects of the first heat exchange pipeline 1 and the second heat exchange pipeline 2 is reduced, and the refrigeration performance of the outdoor heat exchanger and the air conditioner is integrally improved.

As a preferable implementation of the control method provided in the foregoing embodiment, the step of selectively controlling the first expansion valve 4 based on the comparison result in step S300 includes: if the first temperature or the second temperature is less than the outdoor ambient temperature, the first expansion valve 4 is adjusted.

For example, in the case of refrigeration of the outdoor heat exchanger, the first heat exchange pipeline 1 and the second heat exchange pipeline 2 are condensed to release heat, and the surface temperature of the first heat exchange pipeline 1 and the second heat exchange pipeline 2 should be higher than the temperature of the outdoor environment under normal conditions. When the first temperature of the first heat exchange pipeline 1 or the second temperature of the second heat exchange pipeline 2 is lower than the outdoor environment temperature, it indicates that a bias current occurs between the first heat exchange pipeline 1 and the second heat exchange pipeline 2, no balanced refrigeration occurs, and the heat exchange pipeline with the temperature lower than the outdoor environment temperature has abnormal refrigeration, at this time, the first expansion valve 4 needs to be adjusted, so that the first heat exchange pipeline 1 and the second heat exchange pipeline 2 can both refrigerate normally, and the refrigeration effect is kept balanced.

As a preferable implementation of the control method provided in the foregoing embodiment, the method for adjusting the first expansion valve 4 in step S300 includes: if the first temperature is higher than the second temperature, the opening degree of the first expansion valve 4 is decreased until the first temperature is equal to the second temperature; and/or, if the first temperature is less than the second temperature, increasing the opening degree of the first expansion valve 4 until the first temperature is equal to the second temperature.

For example, when the first expansion valve 4 is adjusted, if the first temperature is higher than the second temperature, it indicates that the heat released from the refrigerant in the second heat exchange pipeline 2 is small, that is, the refrigeration of the second heat exchange pipeline 2 is abnormal. At this time, the flow of the output end of the first expansion valve 4 can be reduced by reducing the opening degree of the first expansion valve 4, so that the flow of the output ends of the first expansion valve 4 and the second expansion valve 5 is balanced, and the second heat exchange pipeline 2 recovers the normal refrigerating capacity until the first temperature of the first heat exchange pipeline 1 is equal to the second temperature of the second heat exchange pipeline 2, thereby ensuring the normal refrigerating effect of the outdoor heat exchanger or the air conditioner.

If the first temperature is lower than the second temperature, it is indicated that the heat released by the refrigerant of the first heat exchange pipeline 1 is small, that is, the first heat exchange pipeline 1 is abnormal in refrigeration, at this time, the flow rate of the refrigerant in the first heat exchange pipeline 1 needs to be increased, so that the flow rate of the output end of the first expansion valve 4 can be increased by increasing the opening degree of the first expansion valve 4, the flow rates of the output ends of the first expansion valve 4 and the second expansion valve 5 are balanced, and the first heat exchange pipeline 1 is enabled to recover the normal refrigeration capacity until the first temperature of the first heat exchange pipeline 1 is equal to the second temperature of the second heat exchange pipeline 2, thereby ensuring the normal refrigeration effect of the outdoor heat exchanger or the air conditioner.

As a preferable implementation manner of the control method provided by the above embodiment, the air conditioning system further includes a second on-off valve 7, and the second on-off valve 7 is connected in parallel with the supercooling heat exchange pipeline 3; the second on-off valve 7 is set to be on when the refrigerant flows from the indoor heat exchanger to the first expansion valve 4 and the second expansion valve 5, and to be off when the refrigerant flows from the first expansion valve 4 and the second expansion valve 5 to the indoor heat exchanger; the control method of the air conditioning system is characterized by further comprising the following steps: in the heating mode, the flow ratio of the refrigerant which is distributed to the supercooling heat exchange pipeline 3 by the indoor heat exchanger and the second on-off valve 7 is controlled, so that the flow of the refrigerant in the supercooling heat exchange pipeline 3 is smaller than the flow of the refrigerant in the second on-off valve 7.

For example, the control of the flow ratio of the refrigerant in the supercooling heat exchange pipeline 3 and the second shutoff valve 7 may be implemented by changing the relative values of the resistance coefficients of the second shutoff valve 7 and the supercooling heat exchange pipeline 3, and the flow of the refrigerant in the supercooling heat exchange pipeline 3 is smaller than the flow of the refrigerant in the second shutoff valve 7.

Therefore, on one hand, the condensation of a small part of the refrigerant through the supercooling heat exchange pipeline 3 is ensured to release heat to the outside, and the effect of reducing the frosting degree of the second heat exchange pipeline 2 or increasing the defrosting effect of the second heat exchange pipeline 2 is achieved; on the other hand, most of the refrigerant enters the first expansion valve 4 and the second expansion valve 5 from the indoor heat exchanger (not shown) through the second on-off valve 7 for throttling adjustment, so that the refrigerant is prevented from causing great heat loss in the supercooling heat exchange pipeline 3, and the heating effect of the outdoor heat exchanger is ensured.

It should be noted that although the detailed steps of the method of the present invention have been described in detail, those skilled in the art can combine, separate and change the order of the above steps without departing from the basic principle of the present invention, and the modified technical solution does not change the basic concept of the present invention and thus falls into the protection scope of the present invention.

It should be understood by those skilled in the art that the control method of the air conditioning system provided in the present embodiment may be stored as a program in a computer-readable storage medium. The storage medium includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) or a processor (processor) to perform some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.