CO2 heat pump air conditioner and air conditioning system

Abstract

The utility model relates to the technical field of air conditioners, in particular to a CO2 heat pump air conditioner and an air conditioning system. The utility model aims to solve the problem of low refrigeration energy efficiency when carbon dioxide is used as a refrigerant. In order to achieve the purpose, the CO2 heat pump air conditioner comprises a compressor, an outdoor heat exchanger, a first heat regenerator, a second heat regenerator, an ejector, a gas-liquid separator, a first throttling element and a first indoor heat exchanger. The second port of the first heat regenerator communicates with the first port of the second heat regenerator, and the third port and the fourth port of the second heat regenerator can communicate with the cooling inlet pipe and the cooling outlet pipe correspondingly. The refrigerant discharged by the outdoor heat exchanger is supercooled twice through the first heat regenerator and the second heat regenerator, the supercooling degree of the refrigerant behind the outdoor heat exchanger is increased, the refrigerating capacity of the refrigerant per unit mass can be obviously increased, and the refrigerating energy efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning, in particular to a CO2 heat pump air conditioner and an air conditioning system. Background Art

[0002] At present, the mainstream refrigerant filled in air-conditioning systems is HFCs (hydrofluorocarbons) represented by R32 and R410A. Its high GWP (global warming potential) is destined to be gradually replaced. The potential substitute in the future is hydrocarbons represented by R290, but the safety issues caused by flammability and explosion have greatly limited the large-scale promotion and application of this refrigerant. The current research on the safety of R290 refrigerant mainly focuses on its combustion characteristics, leakage and diffusion characteristics, reducing the filling amount, risk source analysis and safety technology in the manufacturing process. Its safety precautions are mainly focused on passive response after the refrigerant leaks. It lacks the necessary safety defense capabilities during operation. Therefore, this refrigerant can only be used for small-capacity hanging units, and it is difficult to use it in systems with large filling amounts, floor-standing cabinets, unit units and household central air conditioners.

[0003] As a natural refrigerant, CO2 (carbon dioxide) is very suitable for use as an alternative refrigerant for air conditioners because of its low cost, zero ODP (ozone depletion potential), low GWP, non-toxic and non-flammable, and high heat transfer coefficient. However, the factors that currently limit the promotion of CO2 include high cost, immature supply chain, and low refrigeration efficiency. How to solve the above problems will become the key to replacing household air conditioner refrigerants.

[0004] Therefore, the art needs a new technical solution to solve at least one of the above problems. Utility Model Content

[0005] The present application aims to solve at least one of the above problems in the prior art, that is, to solve the problem of low refrigeration efficiency when carbon dioxide is used as a refrigerant. The present application provides a CO2 heat pump air conditioner, the CO2 heat pump air conditioner comprising:

[0006] compressor;

[0007] an outdoor heat exchanger, wherein a first port of the outdoor heat exchanger is in communication with an exhaust port of the compressor;

[0008] a first heat exchanger, wherein the first heat exchanger has a first port, a second port, a third port and a fourth port, a first heat exchange flow path is formed between the first port and the second port of the first heat exchanger, a second heat exchange flow path is formed between the third port and the fourth port of the first heat exchanger, the second port of the outdoor heat exchanger is communicated with the first port of the first heat exchanger, and the fourth port of the first heat exchanger is communicated with the suction port of the compressor;

[0009] a second heat exchanger, wherein the second heat exchanger has a first port, a second port, a third port and a fourth port, a third heat exchange flow path is formed between the first port and the second port of the second heat exchanger, a fourth heat exchange flow path is formed between the third port and the fourth port of the second heat exchanger, the second port of the first heat exchanger is in communication with the first port of the second heat exchanger, and the third port and the fourth port of the second heat exchanger can be in communication with the cooling inlet pipe and the cooling outlet pipe respectively;

[0010] an ejector, wherein an inlet of the ejector is in communication with a second port of the second regenerator;

[0011] a gas-liquid separator, wherein the inlet of the gas-liquid separator is communicated with the outlet of the ejector, and the exhaust port of the gas-liquid separator is communicated with the third port of the first regenerator;

[0012] a first throttling element, wherein a first port of the first throttling element is in communication with a liquid discharge port of the gas-liquid separator;

[0013] A first indoor heat exchanger, wherein a first port of the first indoor heat exchanger is communicated with a second port of the first throttling element, and a second port of the first indoor heat exchanger is communicated with an injection port of the ejector.

[0014] By simultaneously arranging the first heat regenerator and the second heat regenerator in the CO2 heat pump air conditioner, the refrigerant discharged from the outdoor heat exchanger can be supercooled twice by the first heat regenerator and the second heat regenerator, thereby increasing the supercooling degree of the refrigerant after the outdoor heat exchanger, significantly increasing the cooling capacity of the refrigerant per unit mass, and improving the refrigeration energy efficiency.

[0015] In the preferred technical solution of the above-mentioned CO2 heat pump air conditioner, the outdoor heat exchanger is a first liquid-cooled heat exchanger, the first liquid-cooled inlet of the first liquid-cooled heat exchanger is connected to the fourth port of the second heat regenerator through a first connecting pipe, and the first liquid-cooled outlet of the first liquid-cooled heat exchanger is connected to the cooling outlet pipe.

[0016] By connecting the fourth port of the second heat regenerator to the outdoor heat exchanger, the medium after heat exchange with the refrigerant in the second heat regenerator can be used to exchange heat with the outdoor heat exchanger, thereby further reducing the supercooling of the refrigerant and realizing the utilization of heat.

[0017] In the preferred technical solution of the above CO2 heat pump air conditioner, the flow directions of the first heat exchange flow path and the second heat exchange flow path are opposite; and / or

[0018] The flow directions between the third heat exchange flow path and the fourth heat exchange flow path are opposite.

[0019] The above arrangement can improve the heat exchange effect between the first heat regenerator and the second heat regenerator.

[0020] In the preferred technical solution of the above CO2 heat pump air conditioner, the first indoor heat exchanger is a second liquid-cooled heat exchanger, and the second liquid-cooled inlet and the second liquid-cooled outlet of the second liquid-cooled heat exchanger can be connected to the refrigeration inlet pipe and the refrigeration outlet pipe respectively.

[0021] The above arrangement can utilize the refrigeration inlet pipe and the refrigeration outlet pipe to exchange heat with the first indoor heat exchanger, thereby realizing the utilization of cold energy.

[0022] In the preferred technical solution of the above-mentioned CO2 heat pump air conditioner, the CO2 heat pump air conditioner also includes a second indoor heat exchanger, a first port of the second indoor heat exchanger is connected to the outlet of the ejector, and a second port of the second indoor heat exchanger is connected to the inlet of the gas-liquid separator.

[0023] In the preferred technical solution of the above-mentioned CO2 heat pump air conditioner, the second indoor heat exchanger is a third liquid-cooled heat exchanger, the third liquid-cooled inlet of the third liquid-cooled heat exchanger is connected to the refrigeration inlet pipe, and the third liquid-cooled outlet of the third liquid-cooled heat exchanger is connected to the second liquid-cooled inlet through a second connecting pipe.

[0024] The above arrangement can achieve heat exchange between the medium and the first indoor heat exchanger and the second indoor heat exchanger at the same time, thereby improving the utilization effect of cooling capacity.

[0025] In the preferred technical solution of the above CO2 heat pump air conditioner, the flow direction of the refrigerant in the first indoor heat exchanger is opposite to the flow direction of the refrigerant in the first indoor heat exchanger; and / or

[0026] The flow direction of the refrigerant in the second indoor heat exchanger is opposite to the flow direction of the refrigerant in the second indoor heat exchanger.

[0027] The above arrangement can improve the heat exchange effect between the medium and the first indoor heat exchanger and the second indoor heat exchanger.

[0028] In the preferred technical solution of the CO2 heat pump air conditioner, the CO2 heat pump air conditioner further comprises a reversing valve, the reversing valve comprises a first interface, a second interface, a third interface and a fourth interface, wherein

[0029] The first interface is communicated with the exhaust port of the compressor, the second interface is communicated with the first port of the outdoor heat exchanger, the third interface is communicated with the third port of the first regenerator, and the fourth interface is communicated with the exhaust port of the gas-liquid separator; or

[0030] The first interface is communicated with the exhaust port of the compressor, the second interface is communicated with the first port of the outdoor heat exchanger, the third interface is communicated with the suction port of the compressor, and the fourth interface is communicated with the fourth port of the first heat regenerator.

[0031] In the preferred technical solution of the above-mentioned CO2 heat pump air conditioner, the CO2 heat pump air conditioner also includes a first bypass pipe, a second bypass pipe and a second throttling element, the first end of the first bypass pipe is connected to the second port of the first indoor heat exchanger, and the second end is connected between the second port of the second indoor heat exchanger and the inlet of the gas-liquid separator, the first end of the second bypass pipe is connected between the outlet of the ejector and the first port of the second indoor heat exchanger, and the second end is connected between the second port of the first heat regenerator and the first port of the second heat regenerator, and the second throttling element is arranged on the second bypass pipe.

[0032] The present application also provides an air-conditioning system, which includes the CO2 heat pump air-conditioning described in any one of the above-mentioned preferred technical solutions.

[0033] The air-conditioning system of the present application can improve the supercooling degree of the refrigerant after the outdoor heat exchanger by setting the above-mentioned CO2 heat pump air-conditioning, which can significantly increase the cooling capacity of the refrigerant per unit mass and improve the refrigeration energy efficiency of the air-conditioning system. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present application is described below with reference to the accompanying drawings. In the accompanying drawings:

[0035] Figure 1 This is a system diagram of the first implementation of the CO2 heat pump air conditioner of the present application;

[0036] Figure 2 This is a system diagram of a second embodiment of the CO2 heat pump air conditioner of the present application;

[0037] Figure 3 This is a system diagram of a third embodiment of the CO2 heat pump air conditioner of the present application;

[0038] Figure 4 This is a system diagram of a fourth embodiment of the CO2 heat pump air conditioner of the present application;

[0039] Figure 5 A system diagram of a first embodiment of the air conditioning system of the present application;

[0040] Figure 6 A system diagram of a second embodiment of the air conditioning system of the present application;

[0041] Figure 7 A system diagram of a third embodiment of the air conditioning system of the present application;

[0042] Figure 8 This is a system diagram of a fourth embodiment of the air-conditioning system of the present application.

[0043] Reference numerals list

[0044] 1. Compressor; 2. Outdoor heat exchanger; 3. First regenerator; 4. Second regenerator; 5. Ejector; 6. Gas-liquid separator; 7. First throttling element; 8. First indoor heat exchanger; 9. Second indoor heat exchanger; 10. Cooling inlet pipe; 11. Cooling outlet pipe; 12. Reversing valve; 13. First bypass pipeline; 14. Second bypass pipeline; 15. Second throttling element; 16. First non-return valve; 17. Second non-return valve; 18. First water tank; 19. Second water tank; 20. Refrigeration inlet pipe; 21. Refrigeration outlet pipe; 22. First connecting pipe; 23. Second connecting pipe; 24. First pump body; 25. Second pump body. DETAILED DESCRIPTION

[0045] The preferred embodiments of the present application are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present application and are not intended to limit the scope of protection of the present application. For example, although the drawings are all introduced in conjunction with the CO2 heat pump air conditioner with a reversing valve, this setting is not static, and those skilled in the art can make adjustments to it as needed to adapt to specific applications. For example, those skilled in the art can omit the setting of the reversing valve, or replace the reversing valve with other valves or valve groups that can achieve equivalent functions.

[0046] It should be noted that in the description of this application, the terms "upper", "lower", "left", "right", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the 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 therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", "third", and "fourth" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0047] In addition, it should be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "connected", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0048] First refer to Figure 1 , the CO2 heat pump air conditioner of the present application is described.

[0049] like Figure 1As shown, in order to solve the problem of low refrigeration efficiency when carbon dioxide is used as a refrigerant, the CO2 heat pump air conditioner of the present application includes: a compressor 1, an outdoor heat exchanger 2, a first regenerator 3, a second regenerator 4, an ejector 5, a gas-liquid separator 6, a first throttling element 7 and a first indoor heat exchanger 8. The first regenerator 3 has a first port ( Figure 1 Upper left port), the second port ( Figure 1 Lower left port), the third port ( Figure 1 Lower right port) and the fourth port ( Figure 1 The first heat exchange flow path is formed between the first port and the second port of the first heat exchanger 3, and the second heat exchange flow path is formed between the third port and the fourth port of the first heat exchanger 3. Heat exchange can be performed between the first heat exchange flow path and the second heat exchange flow path. Similarly, the second heat exchanger 4 has a first port ( Figure 1 Upper right port), the second port ( Figure 1 Lower right port), the third port ( Figure 1 Lower left port) and the fourth port ( Figure 1 Upper left port), a third heat exchange flow path is formed between the first port and the second port of the second heat regenerator 4, a fourth heat exchange flow path is formed between the third port and the fourth port of the second heat regenerator 4, and heat exchange can be performed between the third heat exchange flow path and the fourth heat exchange flow path.

[0050] The first port of the outdoor heat exchanger 2 is communicated with the exhaust port of the compressor 1, the second port of the outdoor heat exchanger 2 is communicated with the first port of the first reheater 3, the second port of the first reheater 3 is communicated with the first port of the second reheater 4, the second port of the second reheater 4 is communicated with the inlet of the ejector 5, and the third port and the fourth port of the second reheater 4 can be respectively communicated with the cooling inlet pipe 10 and the cooling outlet pipe 11. The outlet of the ejector 5 is communicated with the inlet of the gas-liquid separator 6, the exhaust port of the gas-liquid separator 6 is communicated with the third port of the first reheater 3, the fourth port of the first reheater 3 is communicated with the suction port of the compressor 1, the discharge port of the gas-liquid separator 6 is communicated with the first port of the first throttling element 7, the second port of the first throttling element 7 is communicated with the first port of the first indoor heat exchanger 8, and the second port of the first indoor heat exchanger 8 is communicated with the injection port of the ejector 5.

[0051] Thus, during operation, the refrigerant discharged from the compressor 1 enters the outdoor heat exchanger 2 for heat exchange. After the heat exchange is completed, the refrigerant enters the first heat exchange path of the first heat exchanger 3 and exchanges heat with the refrigerant in the second heat exchange path to achieve supercooling. The refrigerant discharged from the first heat exchanger 3 then enters the third heat exchange path of the second heat exchanger 4 and exchanges heat with the medium in the fourth heat exchange path for another supercooling. The refrigerant discharged from the second heat exchanger 4 enters the ejector 5 through the inlet of the ejector 5 and is ejected into the gas-liquid separator 6 through the outlet of the ejector 5. The refrigerant entering the gas-liquid separator 6 is divided into two paths, wherein the gaseous refrigerant is discharged from the exhaust port of the gas-liquid separator 6 and flows back to the compressor 1 from the air intake port of the compressor 1 after passing through the second heat exchange path of the first heat exchanger 3. The liquid refrigerant in the gas-liquid separator 6 is discharged from the discharge port of the gas-liquid separator 6, and enters the first indoor heat exchanger 8 for heat exchange after throttling and reducing the pressure by the first throttling element 7. The refrigerant after heat exchange flows back to the ejector 5 through the injection port of the ejector 5, mixes with the refrigerant in the ejector 5, and continues to participate in the circulation.

[0052] It can be seen that by simultaneously arranging the first reheater 3 and the second reheater 4 in the CO2 heat pump air conditioner, the refrigerant discharged from the outdoor heat exchanger 2 can be supercooled twice by the first reheater 3 and the second reheater 4, thereby increasing the supercooling degree of the refrigerant after the outdoor heat exchanger 2, and significantly increasing the cooling capacity of the unit mass of the refrigerant, thereby improving the refrigeration energy efficiency.

[0053] Continue to refer to Figure 1 , the first specific implementation method of this application is introduced.

[0054] like Figure 1 As shown, in the first preferred embodiment of the present application, the CO2 heat pump air conditioner includes a compressor 1, a reversing valve 12, an outdoor heat exchanger 2, a first regenerator 3, a second regenerator 4, an ejector 5, a gas-liquid separator 6, a first throttling element 7, a second throttling element 15, a first indoor heat exchanger 8, a second indoor heat exchanger 9, a first bypass pipeline 13 and a second bypass pipeline 14.

[0055] The reversing valve 12 is a four-way valve, which includes a first interface a, a second interface b, a third interface c and a fourth interface d. The exhaust port of the compressor 1 is connected to the first interface a of the reversing valve 12, and the second interface b of the reversing valve 12 is connected to the first port ( Figure 1 The second port of the outdoor heat exchanger 2 ( Figure 1 The left port in the middle is connected to the first port of the first heat exchanger 3, the second port of the first heat exchanger 3 is connected to the first port of the second heat exchanger 4, the second port of the second heat exchanger 4 is connected to the inlet of the ejector 5, the third port of the second heat exchanger 4 is connected to the cooling inlet pipe 10, and the fourth port of the second heat exchanger 4 is connected to the cooling outlet pipe 11. The outlet of the ejector 5 is connected to the first port ( Figure 1 The left port in the middle is connected to the second port of the second indoor heat exchanger 9 ( Figure 1 The right side port in the middle is connected to the inlet of the gas-liquid separator 6.

[0056] The exhaust port of the gas-liquid separator 6 is connected to the fourth interface d of the reversing valve 12, the third interface c of the reversing valve 12 is connected to the third port of the first regenerator 3, and the fourth interface of the first regenerator 3 is connected to the air intake port of the compressor 1. The discharge port of the gas-liquid separator 6 is connected to the first port ( Figure 1 The right port in the middle is connected, and the second port of the first throttling element 7 ( Figure 1 The left side port in the middle) and the first port of the first indoor heat exchanger 8 ( Figure 1 The right side port in the middle is connected to the second port of the first indoor heat exchanger 8 ( Figure 1 The left side port in the middle is connected with the injection port of the injector 5.

[0057] The first end of the first bypass pipeline 13 is connected to the pipeline between the second port of the first indoor heat exchanger 8 and the injection port of the ejector 5, and the second end is connected to the pipeline between the second port of the second indoor heat exchanger 9 and the inlet of the gas-liquid separator 6. The first bypass pipeline 13 is provided with a first check valve 16. The first end of the second bypass pipeline 14 is connected to the pipeline between the outlet of the ejector 5 and the first port of the second indoor heat exchanger 9, and the second end is connected to the pipeline between the second port of the first regenerator 3 and the first port of the second regenerator 4. The second bypass pipeline 14 is provided with a second throttle valve and a second check valve 17.

[0058] Among them, the medium in the cooling inlet pipe 10 and the cold zone outlet pipe can be water or other cooling media. The following embodiments of the present application are introduced by taking water as an example. The first throttling element 7 and the second throttling valve are both electronic expansion valves. The outdoor heat exchanger 2, the first indoor heat exchanger 8 and the second indoor heat exchanger 9 are all air-cooled heat exchangers for exchanging heat with air. The first one-way valve 16 is configured to be conductive when the refrigerant flows from the first end of the first bypass pipeline 13 to the second end, and the second one-way valve 17 is configured to be conductive when the refrigerant flows from the first end of the second bypass pipeline 14 to the second end.

[0059] Combine the following Figure 1 , the working principle of the CO2 heat pump air conditioner of this application is explained.

[0060] like Figure 1As shown, when the CO2 heat pump air conditioner operates in the cooling mode, the first throttling element 7 is opened to a preset opening, and the second throttling element 15 is closed. The refrigerant discharged from the compressor 1 passes through the first interface a and the second interface b of the reversing valve 12 and enters the outdoor heat exchanger 2 to exchange heat with the outdoor air. After the heat exchange is completed, the refrigerant enters the first heat exchange flow path of the first heat exchanger 3 to exchange heat with the refrigerant in the second heat exchange flow path to achieve the first supercooling, wherein the flow direction of the first heat exchange flow path is opposite to that of the second heat exchange flow path. The refrigerant discharged from the first heat exchanger 3 then enters the third heat exchange flow path of the second heat exchanger 4 to exchange heat with the cooling water in the fourth heat exchange flow path to achieve the second supercooling, wherein the flow direction between the third heat exchange flow path and the fourth heat exchange flow path is opposite. The refrigerant discharged from the second heat exchanger 4 enters the ejector 5 from the inlet of the ejector 5, and is ejected from the outlet of the ejector 5 to the second indoor heat exchanger 9 to exchange heat with the indoor air. The refrigerant after heat exchange enters the gas-liquid separator 6. The refrigerant entering the gas-liquid separator 6 is divided into two paths, wherein the gaseous refrigerant is discharged from the exhaust port of the gas-liquid separator 6, and enters the second heat exchange flow path of the regenerator after passing through the fourth interface d and the third interface c of the reversing valve 12 to exchange heat with the first heat exchange flow path, remove excess liquid refrigerant, and finally flows back to the compressor 1 through the air intake port of the compressor 1. The liquid refrigerant in the gas-liquid separator 6 is throttled and depressurized by the first throttling element 7, and the refrigerant after throttling and depressurization enters the first indoor heat exchanger 8 to exchange heat with the indoor air for the second time, and the refrigerant after heat exchange flows back to the ejector 5 through the injection port of the ejector 5, and continues to participate in the circulation after mixing with the refrigerant in the ejector 5.

[0061] When the CO2 heat pump air conditioner is in heating mode, the first throttling element 7 is fully opened, the second throttling element 15 is opened to the set opening, and the reversing valve 12 is reversed. The refrigerant discharged from the compressor 1 enters the gas-liquid separator 6 through the exhaust port of the gas-liquid separator 6 after passing through the first interface a and the fourth interface d of the reversing valve 12. The refrigerant entering the gas-liquid separator 6 is all discharged through the discharge port, and after passing through the first throttling element 7, it enters the first indoor heat exchanger 8 to exchange heat with the indoor air once. The refrigerant after heat exchange enters the second indoor heat exchanger 9 through the first bypass line 13 to exchange heat with the indoor air twice. After heat exchange, the refrigerant passes through the second throttling element 15 of the second bypass line 14 for throttling and pressure reduction, passes through the first heat exchange flow path of the first regenerator 3, and enters the outdoor heat exchanger 2 to exchange heat with the outdoor air, and then passes through the second interface b and the third interface c of the reversing valve 12, and the second heat exchange flow path of the first regenerator 3, and finally flows back to the compressor 1 from the air intake of the compressor 1.

[0062] The above-mentioned arrangement can improve the refrigeration energy efficiency through secondary subcooling under refrigeration conditions. By having the first heat exchange path and the second heat exchange path flow in opposite directions, and the third heat exchange path and the fourth heat exchange path flow in opposite directions, countercurrent heat exchange can be achieved, thereby improving the heat exchange effect of the first regenerator 3 and the second regenerator 4.

[0063] Of course, the above implementation is only preferred. Without departing from the principles of the present application, those skilled in the art may adjust the above implementation so that the present application is suitable for more specific application scenarios.

[0064] For example, although the above embodiment is introduced in conjunction with the example that the outdoor heat exchanger 2, the first indoor heat exchanger 8 and the second indoor heat exchanger 9 are all air-cooled heat exchangers, the above setting method is not the only one. Alternatively, those skilled in the art may replace part or all of the above three heat exchangers with water-cooled heat exchangers. The replacement method will be introduced in conjunction with other embodiments below.

[0065] For example, although the above embodiment is introduced with the first throttling element 7 and the second throttling element 15 as an electronic expansion valve, this is only preferred. In other embodiments, at least one of the first throttling element 7 and the second throttling element 15 can also be replaced by a capillary or other throttling device with adjustable opening.

[0066] For another example, although the above embodiment is described in combination with the example of a first one-way valve 16 being provided on the first bypass line 13 and a second one-way valve 17 being provided on the second bypass line 14, the arrangement of the first one-way valve 16 and the second one-way valve 17 is merely exemplary. In other embodiments, one of the two can be replaced by a valve body that can control opening and closing, such as a solenoid valve.

[0067] For another example, although the above-mentioned embodiment is introduced in conjunction with a CO2 heat pump air conditioner including a reversing valve 12 as an example, the main improvement of the present application is to increase the degree of subcooling during refrigeration of the CO2 heat pump air conditioner by setting a second regenerator 4. Therefore, it is not important whether the reversing valve 12 is set. In other words, the present application can also be applied to a CO2 heat pump air conditioner that is not provided with a reversing valve 12.

[0068] For another example, although the above embodiment is introduced in conjunction with the third interface of the reversing valve 12 being connected to the third port of the first reheater 3 and the fourth interface being connected to the exhaust port of the gas-liquid separator 6, this connection method is not the only one. Alternatively, the third interface can also be connected to the intake port of the compressor 1, and correspondingly the fourth interface can also be connected to the fourth port of the first reheater 3.

[0069] For another example, although the above-mentioned factual method is introduced in conjunction with a CO2 heat pump air conditioner provided with a first bypass pipe 13 and a second bypass pipe 14, this is not intended to limit the scope of protection of the present application. In other embodiments, technical personnel in this field can decide whether to set the above-mentioned two bypass pipes based on the specific application scenario.

[0070] For another example, although the above embodiment is introduced in conjunction with the CO2 heat pump air conditioner provided with a second indoor heat exchanger 9, the provision of the second indoor heat exchanger 9 is not necessary, and those skilled in the art can choose whether to provide the second indoor heat exchanger 9 based on the specific application scenario.

[0071] For another example, although the above embodiment is described in conjunction with the opposite flow directions of the first heat exchange flow path and the second heat exchange flow path, and the opposite flow directions of the third heat exchange flow path and the fourth heat exchange flow path, the flow direction settings in the first regenerator 3 and the second regenerator 4 are not fixed, and those skilled in the art may adjust them, such as setting the first heat exchange flow path and the second heat exchange flow path to have the same flow direction, and / or setting the third heat exchange flow path and the fourth heat exchange flow path to have the same flow direction, etc.

[0072] The above-mentioned replaceable implementations, as well as the replaceable implementations and the preferred implementations, can be used in a cross-coordinated manner to combine new implementations to be suitable for more specific application scenarios.

[0073] Combine the following Figure 2 , the second specific implementation of the CO2 heat pump air conditioner of the present application is introduced. Those skilled in the art should understand that in the following implementation, the differences between the second implementation and the first implementation will be emphasized, and the similarities between the two and the alternative solutions can be referred back to the description in the first implementation.

[0074] like Figure 2 As shown, in the second embodiment, the outdoor heat exchanger 2 is a first liquid-cooled heat exchanger, and the first liquid-cooled inlet ( Figure 2 The first liquid cooling outlet ( Figure 2 The upper right port in the middle) is connected to the cooling outlet pipe 11, and the first port ( Figure 2 middle right lower port) and the second port ( Figure 2 The lower left port in the middle still maintains the connectivity of the first implementation.

[0075] In this way, during the refrigeration process, the cooling water first enters the second heat regenerator 4 to exchange heat with the refrigerant, then enters the outdoor heat exchanger 2 through the first connecting pipe 22, exchanges heat with the refrigerant in the outdoor heat exchanger 2, and is finally discharged through the cooling outlet pipe 11.

[0076] By connecting the fourth port of the second heat regenerator 4 to the outdoor heat exchanger 2, the medium after heat exchange with the refrigerant in the second heat regenerator 4 can be used to exchange heat with the outdoor heat exchanger 2, thereby further reducing the supercooling of the refrigerant and realizing the utilization of heat.

[0077] Combine the following Figure 3 , the third specific implementation of the present application is introduced. Those skilled in the art should understand that in the following implementation, the differences between the third implementation and the first implementation will be introduced in detail, and the similarities between the two and the alternative solutions can refer back to the description in the first implementation.

[0078] like Figure 3 As shown, in the third embodiment, the first indoor heat exchanger 8 is a second liquid-cooled heat exchanger, and the second indoor heat exchanger 9 is a third liquid-cooled heat exchanger. Figure 3 The lower right port) is connected to the refrigeration inlet pipe 20, and the third liquid cooling outlet ( Figure 3 The lower left port) is connected to one end of the second connecting pipe 23, and the first port ( Figure 3 The upper left port) and the second port ( Figure 3 The other end of the second connecting pipe 23 is connected to the second liquid cooling inlet ( Figure 3 The lower left port) is connected to the second liquid cooling outlet ( Figure 3 The lower right port) is connected to the freezing outlet pipe 21.

[0079] Thus, during the refrigeration process, the chilled water first enters the second indoor heat exchanger 9 to exchange heat with the refrigerant, then enters the first indoor heat exchanger 8 through the second connecting pipe 23 to exchange heat with the refrigerant in the first indoor unit, and is finally discharged through the freezing outlet pipe 21. Moreover, the flow direction of the chilled water in the first indoor heat exchanger 8 is opposite to the flow direction of the refrigerant in the first indoor heat exchanger 8, and the flow direction of the chilled water in the second indoor heat exchanger 9 is also opposite to the flow direction of the refrigerant in the second indoor heat exchanger 9.

[0080] The above arrangement can realize heat exchange between the medium and the first indoor heat exchanger 8 and the second indoor heat exchanger 9 at the same time, realize the utilization of cold capacity, and improve the utilization effect of cold capacity. By arranging that the flow direction of chilled water in the first indoor heat exchanger 8 is opposite to the flow direction of the refrigerant in the first indoor heat exchanger 8, and the flow direction of chilled water in the second indoor heat exchanger 9 is also opposite to the flow direction of the refrigerant in the second indoor heat exchanger 9, the heat exchange effect between chilled water and the first indoor heat exchanger 8 and the second indoor heat exchanger 9 can be improved.

[0081] Refer to the following Figure 4 , the fourth embodiment of the present application is introduced. Those skilled in the art should understand that in the following embodiments, the fourth embodiment will focus on the differences between the first embodiment, and the similarities between the two and the alternative solutions can refer back to the description in the first embodiment.

[0082] like Figure 4 As shown, in the fourth embodiment, the outdoor heat exchanger 2, the first indoor heat exchanger 8 and the second indoor heat exchanger 9 are all liquid-cooled heat exchangers. At this time, the cooling inlet pipe 10 is connected to the third port of the second heat regenerator 4, one end of the first connecting pipe 22 is connected to the fourth port of the second heat regenerator 4, the other end of the first connecting pipe 22 is connected to the first liquid-cooled inlet of the outdoor heat exchanger 2, and the first liquid-cooled outlet of the outdoor heat exchanger 2 is connected to the cooling outlet pipe 11. The third liquid-cooled inlet of the second indoor heat exchanger 9 is connected to the freezing inlet pipe 20, the third liquid-cooled outlet of the second indoor heat exchanger 9 is connected to one end of the second connecting pipe 23, the other end of the second connecting pipe 23 is connected to the second liquid-cooled inlet of the first indoor heat exchanger 8, and the second liquid-cooled outlet of the first indoor heat exchanger 8 is connected to the freezing outlet pipe 21.

[0083] In this way, the utilization of cold and heat can be achieved at the same time, and in particular, in this embodiment, the setting of the reversing valve 12, the first bypass pipe 13 and the second bypass pipe 14 can be omitted, and the switching of cold and heat can be achieved through the cooling outlet pipe 11 and the freezing outlet pipe 21.

[0084] The present application also provides an air-conditioning system, which includes the CO2 heat pump air-conditioning in the above preferred embodiment.

[0085] The air-conditioning system of the present application can improve the supercooling degree of the refrigerant after the outdoor heat exchanger 2 by setting the above-mentioned CO2 heat pump air-conditioning, which can significantly increase the cooling capacity of the refrigerant per unit mass and improve the refrigeration energy efficiency of the air-conditioning system.

[0086] Combine the following Figures 5 to 8 , several different implementation modes of the air conditioning system of the present application are introduced.

[0087] First refer to Figure 5 ,exist Figure 5 In the air conditioning system shown in the figure, the CO2 heat pump air conditioning is set in the same way as above. Figure 1 The embodiment shown is the same. In addition, the air conditioning system also includes a first water tank 18, a water inlet pipe is arranged at the lower part of the first water tank 18, and a water outlet pipe is arranged at the upper part, the water inlet pipe is connected to the water source, and the water outlet pipe is connected to the water use port. The cooling inlet pipe 10 and the cooling outlet pipe 11 are connected to the water inlet pipe at the same time, and the cooling outlet pipe 11 is closer to the first water tank 18 than the cooling inlet pipe 10. In this way, when the CO2 heat pump air conditioner is refrigerated, the second regenerator 4 can be used to preheat the water in the water inlet pipe, and then the preheated water can be discharged to the first water tank 18, so as to realize the utilization of the heat in the second regenerator 4.

[0088] Next, refer to Figure 6 ,exist Figure 6 In the air conditioning system shown in the figure, the CO2 heat pump air conditioning is set in the same way as above. Figure 2The embodiment shown is the same. In addition, the air conditioning system also includes a first water tank 18, a water inlet pipe is arranged at the lower part of the first water tank 18, a water outlet pipe and a return pipe are arranged at the upper part, the water inlet pipe is connected to the water source, and the water outlet pipe is connected to the water use port. The cooling inlet pipe 10 is connected to the water inlet pipe, and the cooling outlet pipe 11 is connected to the return pipe through the first pump body 24. In this way, when the CO2 heat pump air conditioner is refrigerated, the first pump body 24 can be turned on, and the water in the water inlet pipe can be preheated by the second heat exchanger 4, and then the preheated water is passed through the outdoor heat exchanger 2 for secondary heat exchange, and returned to the first water tank 18 through the return pipe, so as to realize the utilization of the heat in the second heat exchanger 4 and the outdoor heat exchanger 2. Of course, the heat of the second heat exchanger 4 and the outdoor heat exchanger 2 can also be used to circulate and heat the water in the first water tank 18.

[0089] Next, refer to Figure 7 ,exist Figure 7 In the air conditioning system shown in the figure, the CO2 heat pump air conditioning is set in the same way as above. Figure 3 The embodiment shown is the same. In addition, the air conditioning system also includes a first water tank 18 and a second water tank 19, a water inlet pipe is arranged at the lower part of the first water tank 18, a water outlet pipe is arranged at the upper part, the water inlet pipe is connected to the water source, and the water outlet pipe is connected to the water use port. The cooling inlet pipe 10 and the cooling outlet pipe 11 are connected to the water inlet pipe at the same time, and the cooling outlet pipe 11 is closer to the first water tank 18 than the cooling inlet pipe 10. The second water tank 19 is provided with a water inlet pipe at the upper part, and a water outlet pipe and a return pipe are arranged at the lower part, the water inlet pipe is connected to the water source, and the water outlet pipe is connected to the water use port. The freezing inlet pipe 20 is connected to the water inlet pipe, and the freezing outlet pipe 21 is connected to the return pipe through the second pump body 25. In this way, when the CO2 heat pump air conditioner is refrigerated, the second regenerator 4 can be used to preheat the water in the water inlet pipe of the first water tank 18, and then the preheated water is discharged to the first water tank 18, so as to realize the utilization of the heat in the second regenerator 4. At the same time, the second pump body 25 can be turned on, and the second indoor heat exchanger 9 can be used to precool the water in the water inlet pipe of the second water tank 19, and then the precooled water is secondary cooled through the first indoor heat exchanger 8 and returned to the second water tank 19 through the return pipe, so as to utilize the cold energy in the first indoor heat exchanger 8 and the second indoor heat exchanger 9. Of course, the cold energy of the first indoor heat exchanger 8 and the second indoor heat exchanger 9 can also be used to circulate and cool the water in the second water tank 19.

[0090] Last reference Figure 8 ,exist Figure 8 In the air conditioning system shown in the figure, the CO2 heat pump air conditioning is set in the same way as above. Figure 4The embodiment shown is the same. In addition, the air conditioning system also includes a first water tank 18 and a second water tank 19. The first water tank 18 is provided with a water inlet pipe at the lower part, and a water outlet pipe and a water return pipe at the upper part. The water inlet pipe is connected to the water source, and the water outlet pipe is connected to the water use port. The cooling inlet pipe 10 is connected to the water inlet pipe, and the cooling outlet pipe 11 is connected to the water return pipe through the first pump body 24. The second water tank 19 is provided with a water inlet pipe at the upper part, and a water outlet pipe and a water return pipe at the lower part. The water inlet pipe is connected to the water source, and the water outlet pipe is connected to the water use port. The freezing inlet pipe 20 is connected to the water inlet pipe, and the freezing outlet pipe 21 is connected to the water return pipe through the second pump body 25. In this way, when the CO2 heat pump air conditioner is refrigerating, the first pump body 24 can be turned on, and the water in the water inlet pipe of the first water tank 18 can be preheated by using the second heat exchanger 4, and then the preheated water is subjected to secondary heat exchange through the outdoor heat exchanger 2, and then returned to the first water tank 18 through the return pipe, so as to realize the utilization of the heat in the second heat exchanger 4 and the outdoor heat exchanger 2. Of course, the heat of the second heat exchanger 4 and the outdoor heat exchanger 2 can also be used to circulate and heat the water in the first water tank 18. At the same time, the second pump body 25 can be turned on, and the water in the water inlet pipe of the second water tank 19 can be precooled by using the second indoor heat exchanger 9, and then the precooled water is subjected to secondary cooling through the first indoor heat exchanger 8, and then returned to the second water tank 19 through the return pipe, so as to realize the utilization of the coldness in the first indoor heat exchanger 8 and the second indoor heat exchanger 9. Of course, the coldness of the first indoor heat exchanger 8 and the second indoor heat exchanger 9 can also be used to circulate and cool the water in the second water tank 19.

[0091] At the same time, in this embodiment, in addition to the dual water tanks for simultaneous hot and cold water production, in order to achieve balanced utilization of cold and heat, the capacities of the first water tank 18 and the second water tank 19 can also be configured, such as configuring the capacity of the first tank to be any value between 1 and 2 times that of the second tank.

[0092] Of course, the above four embodiments are only exemplary, and those skilled in the art can adjust the above embodiments based on specific needs so that the present application is applicable to more specific application scenarios. For example, those skilled in the art can adjust the connection positions of the cooling inlet pipe 10, the cooling outlet pipe 11, the freezing inlet pipe 20, and the freezing outlet pipe 21 on their respective water tanks; or can also adjust the setting positions of the inlet and outlet water pipes on the first water tank 18 and the second water tank 19, etc. These changes do not deviate from the principles of the present application.

[0093] Those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims of the present application, any one of the claimed embodiments may be used in any combination.

[0094] So far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present application.

Claims

1. A CO2 heat pump air conditioner, characterized in that: The CO2 heat pump air conditioner comprises: compressor; an outdoor heat exchanger, wherein a first port of the outdoor heat exchanger is in communication with an exhaust port of the compressor; a first heat exchanger, wherein the first heat exchanger has a first port, a second port, a third port and a fourth port, a first heat exchange flow path is formed between the first port and the second port of the first heat exchanger, a second heat exchange flow path is formed between the third port and the fourth port of the first heat exchanger, the second port of the outdoor heat exchanger is communicated with the first port of the first heat exchanger, and the fourth port of the first heat exchanger is communicated with the suction port of the compressor; a second heat exchanger, wherein the second heat exchanger has a first port, a second port, a third port and a fourth port, a third heat exchange flow path is formed between the first port and the second port of the second heat exchanger, a fourth heat exchange flow path is formed between the third port and the fourth port of the second heat exchanger, the second port of the first heat exchanger is in communication with the first port of the second heat exchanger, and the third port and the fourth port of the second heat exchanger can be in communication with the cooling inlet pipe and the cooling outlet pipe respectively; an ejector, wherein an inlet of the ejector is in communication with a second port of the second regenerator; a gas-liquid separator, wherein the inlet of the gas-liquid separator is communicated with the outlet of the ejector, and the exhaust port of the gas-liquid separator is communicated with the third port of the first regenerator; a first throttling element, wherein a first port of the first throttling element is in communication with a liquid discharge port of the gas-liquid separator; A first indoor heat exchanger, wherein a first port of the first indoor heat exchanger is communicated with a second port of the first throttling element, and a second port of the first indoor heat exchanger is communicated with an injection port of the ejector.

2. The CO2 heat pump air conditioner according to claim 1, characterized in that: The outdoor heat exchanger is a first liquid-cooled heat exchanger, a first liquid-cooled inlet of the first liquid-cooled heat exchanger is connected to a fourth port of the second heat regenerator via a first connecting pipe, and a first liquid-cooled outlet of the first liquid-cooled heat exchanger is connected to the cooling outlet pipe.

3. The CO2 heat pump air conditioner according to claim 1, characterized in that: The first heat exchange flow path and the second heat exchange flow path have opposite flow directions; and / or The flow directions between the third heat exchange flow path and the fourth heat exchange flow path are opposite.

4. The CO2 heat pump air conditioner according to any one of claims 1 to 3, characterized in that: The first indoor heat exchanger is a second liquid-cooled heat exchanger, and a second liquid-cooled inlet and a second liquid-cooled outlet of the second liquid-cooled heat exchanger can be connected to a freezing inlet pipe and a freezing outlet pipe respectively.

5. The CO2 heat pump air conditioner according to claim 4, characterized in that: The CO2 heat pump air conditioner further includes a second indoor heat exchanger, a first port of the second indoor heat exchanger is communicated with the outlet of the ejector, and a second port of the second indoor heat exchanger is communicated with the inlet of the gas-liquid separator.

6. The CO2 heat pump air conditioner according to claim 5, characterized in that: The second indoor heat exchanger is a third liquid-cooled heat exchanger, the third liquid-cooled inlet of the third liquid-cooled heat exchanger is connected to the freezing inlet pipe, and the third liquid-cooled outlet of the third liquid-cooled heat exchanger is connected to the second liquid-cooled inlet through a second connecting pipe.

7. The CO2 heat pump air conditioner according to claim 6, characterized in that: The flow direction of the refrigerant in the first indoor heat exchanger is opposite to the flow direction of the refrigerant in the first indoor heat exchanger; and / or The flow direction of the refrigerant in the second indoor heat exchanger is opposite to the flow direction of the refrigerant in the second indoor heat exchanger.

8. The CO2 heat pump air conditioner according to claim 5, characterized in that: The CO2 heat pump air conditioner also includes a reversing valve, which includes a first interface, a second interface, a third interface and a fourth interface. The first interface is communicated with the exhaust port of the compressor, the second interface is communicated with the first port of the outdoor heat exchanger, the third interface is communicated with the third port of the first regenerator, and the fourth interface is communicated with the exhaust port of the gas-liquid separator; or The first interface is communicated with the exhaust port of the compressor, the second interface is communicated with the first port of the outdoor heat exchanger, the third interface is communicated with the suction port of the compressor, and the fourth interface is communicated with the fourth port of the first heat regenerator.

9. The CO2 heat pump air conditioner according to claim 8, characterized in that: The CO2 heat pump air conditioner also includes a first bypass pipe, a second bypass pipe and a second throttling element. The first end of the first bypass pipe is connected to the second port of the first indoor heat exchanger, and the second end is connected between the second port of the second indoor heat exchanger and the inlet of the gas-liquid separator. The first end of the second bypass pipe is connected between the outlet of the ejector and the first port of the second indoor heat exchanger, and the second end is connected between the second port of the first heat regenerator and the first port of the second heat regenerator. The second throttling element is arranged on the second bypass pipe.

10. An air conditioning system, characterized in that: The air conditioning system comprises the CO2 heat pump air conditioner according to any one of claims 1 to 9.

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