阅读说明：本技术 单冷空调系统及其控制方法、热泵空调系统及其控制方法 (Single-cooling air conditioning system and control method thereof, heat pump air conditioning system and control method thereof ) 是由 汪俊勇 熊建国 胡知耀 李志强 周剑波 梁郁龙 于 2019-10-16 设计创作，主要内容包括：本发明公开一种单冷空调系统及其控制方法、热泵空调系统及其控制方法。单冷空调系统包括第一室外换热器、第一室内换热器、第一压缩机、第一过冷换热器、第一电子膨胀阀和节流装置；第一室外换热器分别通过第一冷媒旁路和第一冷媒主路连接至第一过冷换热器,第一电子膨胀阀安装在第一冷媒旁路上；第一过冷换热器还连接至第一压缩机的补气口,并通过节流装置连接至第一室内换热器；第一过冷换热器用于将旁路冷媒与主路冷媒进行换热,并将换热后的旁路冷媒输入第一压缩机,将换热后的主路冷媒经节流装置节流后输入第一室内换热器。本发明通过简单可靠的结构实现压缩机合理可靠的补气控制,提高机组过冷度,保证机组能力不衰减。(The invention discloses a single-cold air conditioning system and a control method thereof, and a heat pump air conditioning system and a control method thereof. The single-cold air conditioning system comprises a first outdoor heat exchanger, a first indoor heat exchanger, a first compressor, a first supercooling heat exchanger, a first electronic expansion valve and a throttling device; the first outdoor heat exchanger is connected to the first supercooling heat exchanger through a first refrigerant bypass and a first refrigerant main path respectively, and the first electronic expansion valve is installed on the first refrigerant bypass; the first supercooling heat exchanger is also connected to an air supplementing port of the first compressor and is connected to the first indoor heat exchanger through a throttling device; the first supercooling heat exchanger is used for exchanging heat between the bypass refrigerant and the main path refrigerant, inputting the bypass refrigerant after heat exchange into the first compressor, and inputting the main path refrigerant after heat exchange into the first indoor heat exchanger after throttling by the throttling device. The invention realizes reasonable and reliable air supplement control of the compressor through a simple and reliable structure, improves the supercooling degree of the unit and ensures that the capacity of the unit is not attenuated.)

1. A single cold air conditioning system, includes first outdoor heat exchanger, first indoor heat exchanger and first compressor, its characterized in that, single cold air conditioning system still includes: the system comprises a first supercooling heat exchanger, a first electronic expansion valve and a throttling device;

the first outdoor heat exchanger is connected to the first supercooling heat exchanger through a first refrigerant bypass and a first refrigerant main path respectively, and the first electronic expansion valve is installed on the first refrigerant bypass;

the first supercooling heat exchanger is also connected to a gas supplementing port of the first compressor and is connected to the first indoor heat exchanger through the throttling device;

the first supercooling heat exchanger is used for exchanging heat between the refrigerant in the first refrigerant bypass and the refrigerant in the first refrigerant main path, inputting the bypass refrigerant after heat exchange into the first compressor, and inputting the main refrigerant after heat exchange into the first indoor heat exchanger after throttling by the throttling device.

2. The single-cold air conditioning system according to claim 1, wherein said first subcooling heat exchanger is provided with a first inlet and a first outlet in communication and a second inlet and a second outlet in communication;

an outlet of the first outdoor heat exchanger is connected to the first inlet through the first refrigerant bypass and is connected to the second inlet through the first refrigerant main path;

the first outlet is connected to a make-up port of the first compressor;

the second outlet is connected to the inlet of the first indoor heat exchanger through the throttling device.

3. The single-cold air conditioning system according to claim 1, further comprising: and the first heat dissipation device is installed on the first electrical box, one end of the first heat dissipation device is connected to the outlet of the first outdoor heat exchanger, and the other end of the first heat dissipation device is respectively connected with the first refrigerant bypass and the first refrigerant main path.

4. The single-cold air conditioning system according to any one of claims 1 to 3, wherein the first subcooling heat exchanger is a plate heat exchanger or a double-tube heat exchanger.

5. A single cold air conditioning system according to any of claims 1 to 3, wherein said throttling means is a capillary tube or an electronic expansion valve.

6. A control method of a single-cold air conditioning system, which is realized based on the single-cold air conditioning system of any one of claims 1 to 5, and is characterized by comprising the following steps:

controlling the opening degree of the first electronic expansion valve according to the air replenishing requirement;

controlling the refrigerant condensed by the first outdoor heat exchanger to be divided into two paths, wherein one path of the refrigerant flows into a first refrigerant bypass and enters the first supercooling heat exchanger after being throttled by the first electronic expansion valve, the other path of the refrigerant enters the first supercooling heat exchanger through a first refrigerant main path, and the two paths of the refrigerant exchange heat in the first supercooling heat exchanger;

the bypass refrigerant after heat exchange is heated and gasified and flows into an air supplement port of the first compressor;

and the main path refrigerant after heat exchange flows into the first indoor heat exchanger for evaporation after being throttled by the throttling device.

7. The method as claimed in claim 6, further comprising, before controlling the refrigerant condensed by the first outdoor heat exchanger to be divided into two paths:

and controlling the refrigerant condensed by the first outdoor heat exchanger to enter a first heat dissipation device to dissipate heat of the first electrical box, and dividing the cooled refrigerant into two paths.

8. The utility model provides a heat pump air conditioning system, includes second outdoor heat exchanger, second indoor heat exchanger, cross valve and second compressor, its characterized in that, heat pump air conditioning system still includes: the first supercooling heat exchanger, the first electronic expansion valve, the third electronic expansion valve and the fourth electronic expansion valve;

one end of the second electronic expansion valve is connected to the second outdoor heat exchanger, the other end of the second electronic expansion valve is connected to the second supercooling heat exchanger through a second refrigerant bypass and a second refrigerant main path respectively, and the third electronic expansion valve is installed on the second refrigerant bypass;

the second supercooling heat exchanger is also connected to an air supplementing port of the second compressor and is connected to the second indoor heat exchanger through the fourth electronic expansion valve;

the second supercooling heat exchanger is used for exchanging heat between the refrigerant in the second refrigerant bypass and the refrigerant in the second refrigerant main path, inputting the bypass refrigerant after heat exchange into the second compressor, and inputting the main refrigerant after heat exchange into the second indoor heat exchanger after throttling by the fourth electronic expansion valve.

9. The heat pump air conditioning system of claim 8 wherein the second subcooling heat exchanger is provided with first and second ports in communication and third and fourth ports in communication;

one end of the second electronic expansion valve is connected to one end of the second outdoor heat exchanger, and the other end of the second electronic expansion valve is connected to the first port through the second refrigerant bypass and connected to the third port through the second refrigerant main path;

the second port is connected to a make-up port of the second compressor;

and the fourth port is connected to one end of the second indoor heat exchanger through the fourth electronic expansion valve.

10. The heat pump air conditioning system of claim 8, further comprising: and the second heat dissipation device is installed on a second electrical box, one end of the second heat dissipation device is connected to the second electronic expansion valve, and the other end of the second heat dissipation device is respectively connected with the second refrigerant bypass and the second refrigerant main path.

11. The heat pump air conditioning system of any of claims 8 to 10, wherein the second subcooling heat exchanger is a plate heat exchanger or a tube heat exchanger.

12. A heat pump air conditioning system control method implemented based on the heat pump air conditioning system according to any one of claims 8 to 11, characterized by comprising:

controlling the opening degree of the third electronic expansion valve according to the air replenishing requirement;

controlling the opening degrees of the second electronic expansion valve and the fourth electronic expansion valve according to the current working mode;

and controlling the flow direction of the refrigerant according to the current working mode so that the refrigerant in the second refrigerant bypass and the refrigerant in the second refrigerant main path exchange heat in the second supercooling heat exchanger, and heating and gasifying the bypass refrigerant after heat exchange to flow into an air supplement port of the second compressor.

13. The method of claim 12, wherein determining the opening degrees of the second electronic expansion valve and the fourth electronic expansion valve based on the current operating mode comprises:

if the current working mode is a refrigeration mode, controlling the second electronic expansion valve to be opened to the maximum, and controlling the fourth electronic expansion valve to be opened to a first preset opening degree for throttling;

and if the current working mode is a heating mode, controlling the fourth electronic expansion valve to be opened to the maximum, and controlling the second electronic expansion valve to be opened to a second preset opening degree for throttling.

14. The method of claim 12, wherein controlling a flow direction of a cooling medium according to the current operation mode comprises:

if the current working mode is a refrigeration mode, controlling the refrigerant condensed by the second outdoor heat exchanger to be divided into two paths, wherein one path of the refrigerant flows into the second refrigerant bypass and enters the second supercooling heat exchanger after being throttled by the third electronic expansion valve, the other path of the refrigerant enters the second supercooling heat exchanger through the second refrigerant main path, and the two paths of the refrigerant exchange heat in the second supercooling heat exchanger;

the bypass refrigerant after heat exchange is heated and gasified and flows into an air supplement port of the second compressor;

and the main refrigerant after heat exchange flows into the second indoor heat exchanger for evaporation after being throttled by the fourth electronic expansion valve.

15. The method as claimed in claim 14, wherein controlling a flow direction of the refrigerant according to the current operation mode further comprises:

if the current working mode is a refrigeration mode, the refrigerant condensed by the second outdoor heat exchanger is controlled to enter a second heat dissipation device to dissipate heat of a second electrical box, and then the refrigerant is divided into two paths, wherein one path of the refrigerant enters a second refrigerant bypass, and the other path of the refrigerant enters a second refrigerant main path.

16. The method of claim 12, wherein controlling a flow direction of a cooling medium according to the current operation mode comprises:

if the current working mode is a heating mode, controlling the refrigerant condensed by the second indoor heat exchanger to flow through the second supercooling heat exchanger through a fourth port and exchange heat with the refrigerant entering the second supercooling heat exchanger through a second refrigerant bypass;

the heat-exchanged bypass refrigerant is heated and gasified and flows into the air supplement port of the second compressor;

the main refrigerant after heat exchange is divided into two paths at the intersection point of the main second refrigerant path and the second refrigerant bypass, one path of refrigerant flows into the second refrigerant bypass, enters the second supercooling heat exchanger after being throttled by the third electronic expansion valve, and the other path of refrigerant enters the second outdoor heat exchanger for evaporation after being throttled by the second electronic expansion valve.

17. The method as claimed in claim 16, wherein controlling a flow direction of the refrigerant according to the current operation mode further comprises:

and if the current working mode is a heating mode, controlling the other branched refrigerant to enter the second heat dissipation device to dissipate heat of the second electrical box, and throttling through the second electronic expansion valve.

18. A computer-readable storage medium on which a computer program is stored, wherein the program, when executed by a processor, implements a single-cold air conditioning system control method according to claim 6 or 7.

19. A computer-readable storage medium on which a computer program is stored, characterized in that the program, when executed by a processor, implements the heat pump air conditioning system control method according to any one of claims 12 to 17.

Technical Field

The invention relates to the technical field of air conditioners, in particular to a single-cold air conditioning system and a control method thereof, and a heat pump air conditioning system and a control method thereof.

Background

For a high-temperature area, the higher the ambient temperature is, the larger the room demand load is, and the higher the temperature is, the larger the capacity attenuation is, the more the compressor of the common air conditioner is at the high-temperature ambient temperature, which affects the comfort of users.

At present, a two-stage enthalpy injection compressor technology for supplementing air by adopting a flash tank is adopted to ensure that the system capacity is not attenuated, but the flash tank is large in size, inconvenient in structural installation, difficult to control in air supplement amount and easy to cause the reliability problem.

Aiming at the problem that the refrigerating capacity of a common compressor is attenuated in a high-temperature environment in the prior art, an effective solution is not provided at present.

Disclosure of Invention

The embodiment of the invention provides a single-cold air conditioning system and a control method thereof, a heat pump air conditioning system and a control method thereof, and aims to solve the problem that the refrigeration capacity of a common compressor is attenuated in a high-temperature environment in the prior art.

In order to solve the above technical problem, an embodiment of the present invention provides a single-cooling air conditioning system, including a first outdoor heat exchanger, a first indoor heat exchanger, and a first compressor, further including: the system comprises a first supercooling heat exchanger, a first electronic expansion valve and a throttling device; the first outdoor heat exchanger is connected to the first supercooling heat exchanger through a first refrigerant bypass and a first refrigerant main path respectively, and the first electronic expansion valve is installed on the first refrigerant bypass; the first supercooling heat exchanger is also connected to a gas supplementing port of the first compressor and is connected to the first indoor heat exchanger through the throttling device; the first supercooling heat exchanger is used for exchanging heat between the refrigerant in the first refrigerant bypass and the refrigerant in the first refrigerant main path, inputting the bypass refrigerant after heat exchange into the first compressor, and inputting the main refrigerant after heat exchange into the first indoor heat exchanger after throttling by the throttling device.

Optionally, the first supercooling heat exchanger is provided with a first inlet and a first outlet which are communicated with each other, and a second inlet and a second outlet which are communicated with each other; an outlet of the first outdoor heat exchanger is connected to the first inlet through the first refrigerant bypass and is connected to the second inlet through the first refrigerant main path; the first outlet is connected to a make-up port of the first compressor; the second outlet is connected to the inlet of the first indoor heat exchanger through the throttling device.

Optionally, the single-cooling air conditioning system further includes: and the first heat dissipation device is installed on the first electrical box, one end of the first heat dissipation device is connected to the outlet of the first outdoor heat exchanger, and the other end of the first heat dissipation device is respectively connected with the first refrigerant bypass and the first refrigerant main path.

Optionally, the first supercooling heat exchanger is a plate heat exchanger or a double-pipe heat exchanger.

Optionally, the throttling device is a capillary tube or an electronic expansion valve.

The embodiment of the invention also provides a control method of the single-cold air conditioning system, which is realized based on the single-cold air conditioning system provided by the embodiment of the invention, and the method comprises the following steps: controlling the opening degree of the first electronic expansion valve according to the air replenishing requirement; controlling the refrigerant condensed by the first outdoor heat exchanger to be divided into two paths, wherein one path of the refrigerant flows into a first refrigerant bypass and enters the first supercooling heat exchanger after being throttled by the first electronic expansion valve, the other path of the refrigerant enters the first supercooling heat exchanger through a first refrigerant main path, and the two paths of the refrigerant exchange heat in the first supercooling heat exchanger; the bypass refrigerant after heat exchange is heated and gasified and flows into an air supplement port of the first compressor; and the main path refrigerant after heat exchange flows into the first indoor heat exchanger for evaporation after being throttled by the throttling device.

Optionally, before controlling the refrigerant condensed by the first outdoor heat exchanger to be divided into two paths, the method further includes: and controlling the refrigerant condensed by the first outdoor heat exchanger to enter a first heat dissipation device to dissipate heat of the first electrical box, and dividing the cooled refrigerant into two paths.

The embodiment of the present invention further provides a heat pump air conditioning system, which includes a second outdoor heat exchanger, a second indoor heat exchanger, a four-way valve, a second compressor, and further includes: the first supercooling heat exchanger, the first electronic expansion valve, the third electronic expansion valve and the fourth electronic expansion valve; one end of the second electronic expansion valve is connected to the second outdoor heat exchanger, the other end of the second electronic expansion valve is connected to the second supercooling heat exchanger through a second refrigerant bypass and a second refrigerant main path respectively, and the third electronic expansion valve is installed on the second refrigerant bypass; the second supercooling heat exchanger is also connected to an air supplementing port of the second compressor and is connected to the second indoor heat exchanger through the fourth electronic expansion valve; the second supercooling heat exchanger is used for exchanging heat between the refrigerant in the second refrigerant bypass and the refrigerant in the second refrigerant main path, inputting the bypass refrigerant after heat exchange into the second compressor, and inputting the main refrigerant after heat exchange into the second indoor heat exchanger after throttling by the fourth electronic expansion valve.

Optionally, the second subcooling heat exchanger is provided with a first port and a second port which are communicated with each other, and a third port and a fourth port which are communicated with each other; one end of the second electronic expansion valve is connected to one end of the second outdoor heat exchanger, and the other end of the second electronic expansion valve is connected to the first port through the second refrigerant bypass and connected to the third port through the second refrigerant main path; the second port is connected to a make-up port of the second compressor; and the fourth port is connected to one end of the second indoor heat exchanger through the fourth electronic expansion valve.

Optionally, the heat pump air conditioning system further includes: and the second heat dissipation device is installed on a second electrical box, one end of the second heat dissipation device is connected to the second electronic expansion valve, and the other end of the second heat dissipation device is respectively connected with the second refrigerant bypass and the second refrigerant main path.

Optionally, the second supercooling heat exchanger is a plate heat exchanger or a double-pipe heat exchanger.

The embodiment of the invention also provides a control method of the heat pump air-conditioning system, which is realized based on the heat pump air-conditioning system provided by the embodiment of the invention, and the method comprises the following steps: controlling the opening degree of the third electronic expansion valve according to the air replenishing requirement; controlling the opening degrees of the second electronic expansion valve and the fourth electronic expansion valve according to the current working mode; and controlling the flow direction of the refrigerant according to the current working mode so that the refrigerant in the second refrigerant bypass and the refrigerant in the second refrigerant main path exchange heat in the second supercooling heat exchanger, and heating and gasifying the bypass refrigerant after heat exchange to flow into an air supplement port of the second compressor.

Optionally, determining the opening degrees of the second electronic expansion valve and the fourth electronic expansion valve according to the current working mode includes: if the current working mode is a refrigeration mode, controlling the second electronic expansion valve to be opened to the maximum, and controlling the fourth electronic expansion valve to be opened to a first preset opening degree for throttling; and if the current working mode is a heating mode, controlling the fourth electronic expansion valve to be opened to the maximum, and controlling the second electronic expansion valve to be opened to a second preset opening degree for throttling.

Optionally, controlling a flow direction of the refrigerant according to the current working mode includes: if the current working mode is a refrigeration mode, controlling the refrigerant condensed by the second outdoor heat exchanger to be divided into two paths, wherein one path of the refrigerant flows into the second refrigerant bypass and enters the second supercooling heat exchanger after being throttled by the third electronic expansion valve, the other path of the refrigerant enters the second supercooling heat exchanger through the second refrigerant main path, and the two paths of the refrigerant exchange heat in the second supercooling heat exchanger; the bypass refrigerant after heat exchange is heated and gasified and flows into an air supplement port of the second compressor; and the main refrigerant after heat exchange flows into the second indoor heat exchanger for evaporation after being throttled by the fourth electronic expansion valve.

Optionally, controlling a flow direction of the refrigerant according to the current working mode, further includes: if the current working mode is a refrigeration mode, the refrigerant condensed by the second outdoor heat exchanger is controlled to enter a second heat dissipation device to dissipate heat of a second electrical box, and then the refrigerant is divided into two paths, wherein one path of the refrigerant enters a second refrigerant bypass, and the other path of the refrigerant enters a second refrigerant main path.

Optionally, controlling a flow direction of the refrigerant according to the current working mode includes: if the current working mode is a heating mode, controlling the refrigerant condensed by the second indoor heat exchanger to flow through the second supercooling heat exchanger through a fourth port and exchange heat with the refrigerant entering the second supercooling heat exchanger through a second refrigerant bypass; the heat-exchanged bypass refrigerant is heated and gasified and flows into the air supplement port of the second compressor; the main refrigerant after heat exchange is divided into two paths at the intersection point of the main second refrigerant path and the second refrigerant bypass, one path of refrigerant flows into the second refrigerant bypass, enters the second supercooling heat exchanger after being throttled by the third electronic expansion valve, and the other path of refrigerant enters the second outdoor heat exchanger for evaporation after being throttled by the second electronic expansion valve.

Optionally, controlling a flow direction of the refrigerant according to the current working mode, further includes: and if the current working mode is a heating mode, controlling the other branched refrigerant to enter the second heat dissipation device to dissipate heat of the second electrical box, and throttling through the second electronic expansion valve.

Embodiments of the present invention also provide a computer-readable storage medium on which a computer program is stored, where the computer program, when executed by a processor, implements a method for controlling a single-cold air conditioning system according to an embodiment of the present invention.

Embodiments of the present invention also provide a computer-readable storage medium on which a computer program is stored, the program, when executed by a processor, implementing a heat pump air conditioning system control method as provided by embodiments of the present invention.

By applying the technical scheme of the invention, the refrigerant bypass and the refrigerant main path are utilized to exchange heat in the supercooling heat exchanger, the bypass refrigerant after heat exchange supplies air to the compressor, and the main path refrigerant after heat exchange is further throttled, so that reasonable and reliable air supply control of the compressor is realized through a simple structure, the supercooling degree or the superheat degree is improved, and the unit capacity is ensured not to be attenuated.

Drawings

Fig. 1 is a schematic structural diagram of a single-cooling air conditioning system according to a first embodiment of the present invention;

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

fig. 3 is a flowchart of a control method for a single-cooling air conditioning system according to a second embodiment of the present invention;

fig. 4 is a schematic structural diagram of a heat pump air conditioning system according to a third embodiment of the present invention;

fig. 5 is another schematic structural diagram of a heat pump air conditioning system according to a third embodiment of the present invention;

fig. 6 is a flowchart of a heat pump air conditioning system control method according to a fourth embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein.