Air conditioning system

Abstract

The utility model relates to the technical field of air conditioners, in particular to an air conditioning system. The problems that an existing air conditioning system is low in heating energy efficiency, and the operation stability of the system is affected are solved. In order to achieve the purpose, the air conditioning system comprises a refrigerant system and a first water system, a refrigerant adopted by the refrigerant system is carbon dioxide, and the refrigerant system comprises a compressor, a first heat exchanger and an injection refrigeration loop. The first water system comprises a heat exchange water tank, and the heat exchange water tank is provided with a third heat exchanger connected into the refrigerant system and a fourth heat exchanger communicated with the heating pipeline. By the adoption of the technical scheme, the air conditioning system can achieve the three functions of refrigeration, water heating and heating, the number of parts of an air conditioner is small, the connection relation is simple, the control difficulty is lowered, stable operation of the system is guaranteed, the water heating function and the heating function can be combined through the arrangement of the heat exchange water tank, and the system is convenient to use. And heat loss caused by multi-stage heat exchange is avoided, and the heating energy efficiency can be improved.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, and specifically to an air conditioning system. Background Technology

[0002] An air conditioning system is a system that uses heat pump technology to provide indoor heating and cooling. It can provide users with a better living and working environment in different seasons. With the development and progress of technology, some air conditioning systems can also be used to provide domestic hot water and heat underfloor heating pipes.

[0003] However, existing air conditioning systems have low heating efficiency, making it impossible to supply domestic hot water and heating for extended periods. Furthermore, the temperature of the domestic hot water they can provide is limited, and in extremely low temperatures, the heating efficiency of the air conditioning system will further decrease. In addition, to achieve multiple functions, the air conditioning system may have more components and more complex piping, increasing the difficulty of control and thus affecting the stability of system operation.

[0004] Accordingly, a new technical solution is needed in this field to solve the above problems. Utility Model Content

[0005] In order to solve at least one of the above-mentioned problems in the prior art, namely, to solve the problem of low heating efficiency and impact on the stability of system operation of existing air conditioning systems, this application provides an air conditioning system, which includes a refrigerant system 1 and a first water system 2. The refrigerant used in the refrigerant system 1 is CO2, and the refrigerant system 1 includes a compressor 11, a first heat exchanger 131, a second heat exchanger 132, an ejector 15, a gas-liquid separator 16, a first throttling device 141, and a second throttling device 142.

[0006] The first water system 2 includes a hot water exchange tank 21, which is provided with an inlet 211 and an outlet 212. The hot water exchange tank 21 is also provided with a third heat exchanger and a fourth heat exchanger 22. The two ends of the third heat exchanger are connected to the refrigerant system 1 so that the refrigerant in the third heat exchanger can exchange heat with the water in the hot water exchange tank 21. The two ends of the fourth heat exchanger 22 are connected to the heating pipe 23 to form a loop.

[0007] Wherein, the exhaust port of the compressor 11 is connected to the inlet of the third heat exchanger, the outlet of the third heat exchanger is connected to the first port of the first throttling device 141, the second port of the first throttling device 141 is connected to the first port of the first heat exchanger 131, and the second port of the first heat exchanger 131 is connected to the suction port of the compressor 11 and the inlet of the ejector 15 respectively.

[0008] The exhaust port of the injector 15 is connected to the inlet of the gas-liquid separator 16, the drain port of the gas-liquid separator 16 is connected to the first port of the second throttling device 142, the second port of the second throttling device 142 is connected to the first inlet of the second heat exchanger 132, the first outlet of the second heat exchanger 132 is connected to the suction port of the injector 15, and the exhaust port of the gas-liquid separator 16 is connected to the suction port of the compressor 11.

[0009] With the above technical solution, the air conditioning system can realize three functions: cooling, hot water production, and heating. The air conditioner has fewer components and simpler connections, which reduces the difficulty of control and ensures stable system operation. Moreover, CO2 refrigerant can maintain good heating performance in ultra-low temperature environments, thereby improving the heating efficiency of the air conditioner. The hot water exchange tank 21 can combine the hot water production and heating functions. While ensuring the hot water supply temperature and heating temperature, it avoids heat loss caused by multi-stage heat exchange, which is conducive to further improving the heating efficiency of the air conditioning system.

[0010] In the preferred embodiment of the above-mentioned air conditioning system, the air conditioning system further includes a first branch 10, which is connected in parallel with the third heat exchanger. The first end of the first branch 10 is connected to the pipeline between the exhaust port of the compressor 11 and the inlet of the third heat exchanger, and the second end of the first branch 10 is connected to the pipeline between the outlet of the third heat exchanger and the first port of the first throttling device 141.

[0011] With the above technical solution, the first branch can enable the air conditioning system to perform only cooling function, thus giving users more choices and improving the user experience.

[0012] In the preferred embodiment of the above-mentioned air conditioning system, the air conditioning system further includes a first three-way valve 171, the first port of the first three-way valve 171 being connected to the exhaust port of the compressor 11, the second port of the first three-way valve 171 being connected to the first end of the first branch 10, and the third port of the first three-way valve 171 being connected to the inlet of the third heat exchanger.

[0013] In the preferred embodiment of the above-mentioned air conditioning system, the air conditioning system further includes a four-way valve 12, wherein the first port a, the second port b, the third port c and the fourth port d of the four-way valve 12 are respectively connected to the exhaust port of the compressor 11, the second port of the first heat exchanger 131, the suction port of the compressor 11 and the first port of the first three-way valve 171.

[0014] In the preferred embodiment of the above-mentioned air conditioning system, the refrigerant system 1 further includes a second three-way valve 172, wherein the first port, the second port and the third port of the second three-way valve 172 are respectively connected to the second port of the first heat exchanger 131, the second port b of the four-way valve 12 and the air inlet of the ejector 15.

[0015] The exhaust port of the gas-liquid separator 16 is connected to the pipeline between the second port of the second three-way valve 172 and the second port b of the four-way valve 12.

[0016] In the preferred embodiment of the above-mentioned air conditioning system, the refrigerant system 1 further includes a control valve 18, the first port of which is connected to the exhaust port of the gas-liquid separator 16, and the second port of which is connected to the pipeline between the second interface of the second three-way valve 172 and the second interface b of the four-way valve 12.

[0017] In the preferred embodiment of the above-mentioned air conditioning system, the refrigerant system 1 further includes a fifth heat exchanger 133, the first inlet of the fifth heat exchanger 133 is connected to the exhaust port of the ejector 15, and the first outlet of the fifth heat exchanger 133 is connected to the air inlet of the gas-liquid separator 16.

[0018] In the preferred embodiment of the above-mentioned air conditioning system, the air conditioning system further includes a second water system 3, the second water system 3 includes an indoor heat exchanger 31, the outlet of the indoor heat exchanger 31 is connected to the second inlet of the fifth heat exchanger 133, the second outlet of the fifth heat exchanger 133 is connected to the second inlet of the second heat exchanger 132, and the second outlet of the second heat exchanger 132 is connected to the inlet of the indoor heat exchanger 31.

[0019] With the above technical solution, the fifth heat exchanger 133 can be used as a medium-temperature heat exchanger to transfer cooling capacity to the room. Furthermore, the fifth heat exchanger 133 and the second heat exchanger 132 can sequentially perform preliminary cooling and secondary cooling on the water flow in the second water system 3, thereby improving the cooling efficiency of the air conditioner.

[0020] In the preferred embodiment of the above-mentioned air conditioning system, the air conditioning system further includes a regenerator 19, wherein a passage is formed between the first port and the second port of the regenerator 19, and a passage is formed between the third port and the fourth port of the regenerator 19.

[0021] The first port of the regenerator 19 is connected to the outlet of the third heat exchanger, the second port of the regenerator 19 is connected to the first port of the first throttling device 141, the third port of the regenerator 19 is connected to the exhaust port of the gas-liquid separator 16, and the fourth port of the regenerator 19 is connected to the suction port of the compressor 11.

[0022] With the above technical solution, the regenerator 19 can achieve subcooling and superheating of the refrigerant, thereby improving the cooling efficiency of the air conditioner.

[0023] In the preferred embodiment of the above-mentioned air conditioning system, the first water system 2 further includes an expansion tank 24 and a water pump 25. The fourth heat exchanger 22, the heating pipe 23, the expansion tank 24 and the water pump 25 are interconnected and form a loop. Attached Figure Description

[0024] The air conditioning system of this application will now be described with reference to the accompanying drawings. In the drawings:

[0025] Figure 1 This is a schematic diagram of the hot water production and heating functions of the air conditioning system in this application;

[0026] Figure 2 This is a schematic diagram of the air conditioning system for cooling and hot water production in this application;

[0027] Figure 3 This is a schematic diagram of the defrosting process of the air conditioning system described in this application.

[0028] List of reference numerals

[0029] 1. Refrigerant system; 10. First branch; 11. Compressor; 12. Four-way valve; a. First port; b. Second port; c. Third port; d. Fourth port; 131. First heat exchanger; 132. Second heat exchanger; 133. Fifth heat exchanger; 141. First throttling device; 142. Second throttling device; 15. Ejector; 16. Gas-liquid separator; 171. First three-way valve; 172. Second three-way valve; 18. Control valve; 19. Regenerator;

[0030] 2. First water system; 21. Hot water tank; 211. Inlet; 212. Outlet; 22. Fourth heat exchanger; 23. Heating pipes; 24. Expansion tank; 25. Water pump;

[0031] 3. Second water system; 31. Indoor heat exchanger. Detailed Implementation

[0032] Preferred embodiments of this application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of this application and are not intended to limit the scope of protection of this application. For example, although the heating pipe system in this embodiment is described in conjunction with underfloor heating coils, this is not intended to limit the scope of protection of this application. Those skilled in the art can apply this application to other application scenarios without departing from the principles of this application. For example, the heating pipe system can be configured as radiators.

[0033] It should be noted that in the description of this application, the terms "upper," "lower," "left," "right," "inner," and "outer," which indicate directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," "third," "fourth," and "fifth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Additionally, in the description of this application, "a plurality of" refers to at least two.

[0034] Furthermore, it should be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0035] As described in the background section, an air conditioning system is a system that uses heat pump technology to provide indoor heating and cooling. It can provide users with a better living and working environment in different seasons. Furthermore, with the development and advancement of technology, some air conditioning systems can also be used to provide domestic hot water and heat underfloor heating pipes.

[0036] However, existing air conditioning systems have low heating efficiency, making it impossible to supply domestic hot water and heating for extended periods. Furthermore, the temperature of the domestic hot water they can provide is limited, and in extremely low temperatures, the heating efficiency of the air conditioning system will further decrease. In addition, to achieve multiple functions, the air conditioning system may have more components and more complex piping, increasing the difficulty of control and thus affecting the stability of system operation.

[0037] To address the issues of low heating efficiency and instability in existing air conditioning systems, this application provides an air conditioning system comprising a refrigerant system 1 and a first water system 2. The refrigerant system 1 uses CO2 as the refrigerant and includes a compressor 11, a first heat exchanger 131, a second heat exchanger 132, an ejector 15, a gas-liquid separator 16, a first throttling device 141, and a second throttling device 142. The first water system 2 includes a hot water tank 21 with an inlet 211 and an outlet 212. The hot water tank 21 also includes a third heat exchanger (not shown) and a fourth heat exchanger 22. The two ends of the third heat exchanger are connected to the refrigerant system 1 to exchange heat between the refrigerant in the third heat exchanger and the water in the hot water tank 21. The two ends of the fourth heat exchanger 22 are connected to a heating pipe 23 to form a loop. The compressor 11's exhaust port is connected to the inlet of the third heat exchanger, the third heat exchanger's outlet is connected to the first port of the first throttling device 141, the first throttling device 141's second port is connected to the first port of the first heat exchanger 131, and the first heat exchanger 131's second port is connected to both the compressor 11's suction port and the ejector 15's inlet. The ejector 15's exhaust port is connected to the gas-liquid separator 16's inlet, the gas-liquid separator 16's drain port is connected to the first port of the second throttling device 142, the second throttling device 142's second port is connected to the first inlet of the second heat exchanger 132, the second heat exchanger 132's first outlet is connected to the ejector 15's suction port, and the gas-liquid separator 16's exhaust port is connected to the compressor 11's suction port.

[0038] With the above technical solution, the air conditioning system can realize three functions: cooling, hot water production, and heating. The air conditioner has fewer components and simpler connections, which reduces the difficulty of control and ensures stable system operation. Moreover, CO2 refrigerant can maintain good heating performance in ultra-low temperature environments, thereby improving the heating efficiency of the air conditioner. The hot water exchange tank 21 can combine the hot water production and heating functions. While ensuring the hot water supply temperature and heating temperature, it avoids heat loss caused by multi-stage heat exchange, which is conducive to further improving the heating efficiency of the air conditioning system.

[0039] The following reference Figures 1 to 3 The air conditioning system described in this application is explained. Among other things, Figure 1 This is a schematic diagram of the hot water production and heating functions of the air conditioning system in this application; Figure 2 This is a schematic diagram of the air conditioning system for cooling and hot water production in this application; Figure 3 This is a schematic diagram of the defrosting process of the air conditioning system described in this application.

[0040] like Figures 1 to 3As shown, in a preferred embodiment, the air conditioning system includes a refrigerant system 1, a first water system 2, and a second water system 3. The refrigerant used in the refrigerant system 1 is CO2, and the refrigerant system 1 includes a first branch 10, a compressor 11, a four-way valve 12, a first heat exchanger 131, a second heat exchanger 132, a first throttling device 141, a second throttling device 142, an ejector 15, a gas-liquid separator 16, a first three-way valve 171, a second three-way valve 172, a control valve 18, and a regenerator 19.

[0041] The first water system 2 includes a hot water exchange tank 21, heating pipes 23, an expansion tank 24, and a water pump 25. The hot water exchange tank 21 is equipped with an inlet 211 and an outlet 212, and also includes a third heat exchanger (not shown in the figure) and a fourth heat exchanger 22. The third heat exchanger is located on the outside of the hot water exchange tank 21, and its two ends are connected to the refrigerant system 1 to exchange heat between the refrigerant in the third heat exchanger and the water in the hot water exchange tank 21. The fourth heat exchanger 22, the heating pipes 23, the expansion tank 24, and the water pump 25 are interconnected to form a loop. The fourth heat exchanger 22 is located on the inside of the hot water exchange tank 21 to exchange heat between the water in the hot water exchange tank 21 and the water in the heating pipes 23, and the heating pipes 23 are configured as underfloor heating coils.

[0042] The compressor 11's exhaust port is connected to the first port a of the four-way valve 12, the four-way valve 12's third port c is connected to the compressor 11's intake port, and the compressor 11's fourth port d is connected to the first port (left port in the diagram) of the first three-way valve 171. The first branch 10 is connected in parallel with the third heat exchanger. The second port (middle port in the diagram) of the first three-way valve 171 is connected to the first end (upper end in the diagram) of the first branch 10, and the third port (right port in the diagram) of the first three-way valve 171 is connected to the inlet of the third heat exchanger.

[0043] A passage is formed between the first port (upper right port in the illustrated direction) and the second port (upper left port in the illustrated direction) of the regenerator 19, and a passage is formed between the third port (lower right port in the illustrated direction) and the second port (lower left port in the illustrated direction) of the regenerator 19. The outlet of the third heat exchanger and the second end (lower end in the direction shown in the figure) of the first branch 10 are both connected to the first port of the regenerator 19. The second port of the regenerator 19 is connected to the first port (upper interface in the direction shown in the figure) of the first throttling device 141. The second port (lower interface in the direction shown in the figure) of the first throttling device 141 is connected to the first port (upper interface in the direction shown in the figure) of the first heat exchanger 131. The second port (lower interface in the direction shown in the figure) of the first heat exchanger 131 is connected to the first interface (upper interface in the direction shown in the figure) of the second three-way valve 172. The second interface (middle interface in the direction shown in the figure) of the second three-way valve 172 is connected to the second interface b of the four-way valve 12. The third interface (lower interface in the direction shown in the figure) of the second three-way valve 172 is connected to the air inlet of the ejector 15.

[0044] The exhaust port of ejector 15 is connected to the first inlet (upper left interface in the diagram) of the fifth heat exchanger 133, the first outlet (upper right interface in the diagram) of the fifth heat exchanger 133 is connected to the inlet of gas-liquid separator 16, the drain port of gas-liquid separator 16 is connected to the first port (upper side interface in the diagram) of the second throttling device 142, the second port (lower side interface in the diagram) of the second throttling device 142 is connected to the first inlet (upper right interface in the diagram) of the second heat exchanger 132, and the first outlet (upper left interface in the diagram) of the second heat exchanger 132 is connected to the suction port of ejector 15. The exhaust port of gas-liquid separator 16 is connected to the third port of regenerator 19, the fourth port of regenerator 19 is connected to the first port (right side interface in the diagram) of control valve 18, and the second port (left side interface in the diagram) of control valve 18 is connected to the pipeline between the second interface of the second three-way valve 172 and the second interface b of the four-way valve 12. Control valve 18 is configured as a one-way valve.

[0045] The second water system 3 includes an indoor heat exchanger 31. The outlet of the indoor heat exchanger 31 (right side interface in the diagram direction) is connected to the second inlet of the fifth heat exchanger 133 (lower right interface in the diagram direction). The second outlet of the fifth heat exchanger 133 (lower left interface in the diagram direction) is connected to the second inlet of the second heat exchanger 132 (lower left interface in the diagram direction). The second outlet of the second heat exchanger 132 (lower right interface in the diagram direction) is connected to the inlet of the indoor heat exchanger 31 (left side interface in the diagram direction).

[0046] like Figure 1As shown, when only hot water is being produced, or when both hot water and heating are being produced, the first port a of the four-way valve 12 is connected to the fourth port d, the second port b is connected to the third port c, the first port of the first three-way valve 171 is connected to the third port, the first port of the second three-way valve 172 is connected to the second port, and the first throttling device 141 is opened to a certain degree.

[0047] The compressor 11 compresses the refrigerant into a high-temperature, high-pressure refrigerant gas. This gas passes sequentially through the first port a and the fourth port d of the four-way valve 12, and the first port and the third port of the first three-way valve 171, before entering the third heat exchanger. The third heat exchanger is located outside the hot water tank 21. At this time, cold water enters the hot water tank 21 through the inlet 211. As the refrigerant flows through the third heat exchanger, it exchanges heat with the water in the tank 21. The heated hot water then flows out from the outlet 212, supplying domestic hot water. The refrigerant flowing from the third heat exchanger then passes sequentially through the second port and the first port of the regenerator 19, and the first throttling device 141, before entering the first heat exchanger 131 to absorb heat. Finally, the refrigerant returns to the compressor 11 through the first port and the second port of the first three-way valve 171, and the second port b and the third port c of the four-way valve 12.

[0048] like Figure 2 As shown, during hot water and cooling, the first port a of the four-way valve 12 is connected to the fourth port d, the second port b is connected to the third port c, all three ports of the first three-way valve 171 are kept open, the first port of the second three-way valve 172 is connected to the third port, the first throttling device 141 is kept fully open, and the second throttling devices are all opened to a certain degree.

[0049] The compressor 11 compresses the refrigerant into a high-temperature, high-pressure refrigerant gas. This gas, after passing through the first port a and the fourth port d of the four-way valve 12, is divided into two paths by the first three-way valve 171. One path flows through the first branch 10, while the other path flows through the third heat exchanger to produce hot water. The two paths then merge and sequentially pass through the first and second ports of the regenerator 19 and the first throttling device 141 into the first heat exchanger 131 to release heat. Next, the refrigerant passes through the first and third ports of the second three-way valve 172 and enters the ejector 15 as a motive fluid. Simultaneously, the ejector 15 draws in the refrigerant generated by the heat absorption in the second heat exchanger 132. The gaseous and liquid refrigerant are mixed and then ejected through ejector 15 to the fifth heat exchanger 133. The refrigerant absorbs heat and vaporizes in the fifth heat exchanger 133. Due to insufficient heat exchange, the mixed refrigerant enters the gas-liquid separator 16. The separated gaseous refrigerant returns to the compressor 11 after passing through the third and fourth ports of the regenerator 19, the control valve 18, and the second port b and the third port c of the four-way valve 12. The separated liquid refrigerant is throttled and depressurized by the second throttling device 142 and then enters the second heat exchanger 132 to continue absorbing heat. The refrigerant after heat exchange is drawn into the suction port of ejector 15, and the cycle repeats to complete the refrigeration.

[0050] like Figure 3 As shown, during defrosting, the first port a of the four-way valve 12 is connected to the second port b, the third port c is connected to the fourth port d, the first port of the first three-way valve 171 is connected to the third port, the first port of the second three-way valve 172 is connected to the second port, and the first throttling device 141 is opened to a certain degree.

[0051] The compressor 11 compresses the refrigerant into a high-temperature, high-pressure refrigerant gas. The high-temperature, high-pressure refrigerant gas enters the first heat exchanger 131 after passing through the first port a and the second port b of the four-way valve 12 and the second port and the first port of the second three-way valve 172. At this time, the refrigerant releases heat to melt the frost condensed on the surface of the first heat exchanger 131. Then, the refrigerant passes through the throttling and pressure reduction of the first throttling device 141 and the second port and the first port of the regenerator 19 before entering the third heat exchanger to absorb heat. Then, the refrigerant returns to the compressor 11 through the third port and the first port of the first three-way valve 171 and the fourth port d and the third port c of the four-way valve 12.

[0052] It should be explained that when only hot water is needed, the water pump 25 is in the off state, while when heating is needed, the water pump 25 is in the on state. At this time, the water in the heating pipe 23 exchanges heat with the water in the hot water exchange tank 21 through the fourth heat exchanger 22 inside the hot water exchange tank 21. CO2 has good heating performance when used as a refrigerant, which can simultaneously meet the needs of domestic hot water supply temperature and heating temperature. It has been verified that, under normal circumstances, the water temperature in the hot water exchange tank 21 can reach 60℃-70℃ through the third heat exchanger, and the water temperature in the heating pipe 23 can reach 30℃-40℃ through the fourth heat exchanger 22. Moreover, during defrosting, when the refrigerant absorbs heat from the water in the hot water exchange tank 21 through the third heat exchanger, due to the large water volume and large heat storage in the hot water exchange tank, it will not have a significant impact on the water temperature in the hot water exchange tank 21. Therefore, the setting of the hot water exchange tank 21 can also avoid lowering the hot water supply temperature, thereby ensuring the user's experience.

[0053] In addition, in this embodiment, such as Figure 2 As shown, when only cooling is required, the first port of the first three-way valve 171 can be connected to the second port. In this case, the refrigerant only passes through the first branch 10 and does not enter the third heat exchanger. However, the first branch 10 is not mandatory. In one alternative embodiment, the first branch 10 and the first three-way valve 171 can be omitted. In this case, the fourth port d of the four-way valve 12 is directly connected to the inlet of the third heat exchanger. In another alternative embodiment, a two-way valve can be installed on the first branch 10, and a two-way valve can be installed on the pipeline between the first end of the first branch 10 and the inlet of the third heat exchanger. Hot water can be selectively produced through the two two-way valves. Furthermore, the second three-way valve 172 is not mandatory. Those skilled in the art can omit or change the specific settings of each component as needed. For example, the second three-way valve 172 can be set as multiple two-way valves, as long as it does not affect the normal function of this application.

[0054] It should also be explained that the configuration of control valve 18 is not fixed. Those skilled in the art can modify its specific configuration according to requirements. In one alternative embodiment, control valve 18 can be configured as a solenoid valve, an electric ball valve, an electric butterfly valve, etc. In another alternative embodiment, control valve 18 can be configured as a three-way valve, with its three ports connected to the second port b of four-way valve 12, the fourth port of regenerator 19, and the second port of second three-way valve 172, respectively. Furthermore, the configuration of regenerator 19 is not mandatory, but considering the improvement of air conditioning cooling efficiency by achieving subcooling and superheating through regenerator 19, it is a preferred choice.

[0055] Furthermore, during cooling, the refrigerant temperature in the second heat exchanger 132 is lower than that in the fifth heat exchanger 133. Therefore, the fifth heat exchanger 133 is not strictly necessary. The exhaust port of the ejector 15 can be directly connected to the inlet of the gas-liquid separator 16. However, considering cooling efficiency, the fifth heat exchanger 133 is a preferred choice because it can initially cool the water flow in the second water system 3, thereby improving the cooling efficiency of the air conditioner. Of course, the installation of the second water system 3 is not fixed. In one alternative embodiment, the second water system 3 can be omitted, and a fan can be used to transfer the cooling capacity of the second heat exchanger 132 and the fifth heat exchanger 133 located on the indoor side to the room. In another alternative embodiment, when the second water system 3 is installed, it can be equipped with multiple indoor heat exchangers 31, and these multiple indoor heat exchangers 31 can be connected in parallel.

[0056] Those skilled in the art will understand that although the third and fourth heat exchangers 22 of the hot water tank 21 in this embodiment are respectively located on the outer and inner sides of the hot water tank 21, their arrangement is not mandatory. In an alternative embodiment, both the third and fourth heat exchangers 22 can be located on the inner side of the hot water tank 21, which can also avoid energy loss caused by multi-stage heat exchange and improve heating efficiency. Furthermore, although the heating pipe 23 is set as a geothermal coil in this embodiment, its arrangement is not mandatory. For example, the heating pipe 23 can also be set as a radiator, etc.

[0057] Those skilled in the art will understand that although some embodiments described herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, any of the claimed embodiments in the claims of this application can be used in any combination.

[0058] The technical solutions of this application have been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this 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 all fall within the scope of protection of this application.

Claims

1. An air conditioning system, characterized by, The air conditioning system comprises a refrigerant system (1) and a first water system (2), the refrigerant system (1) adopts CO2 as refrigerant, and the refrigerant system (1) comprises a compressor (11), a first heat exchanger (131), a second heat exchanger (132), an ejector (15), a gas-liquid separator (16), a first throttling device (141) and a second throttling device (142); The first water system (2) comprises a heat exchange water tank (21), the heat exchange water tank (21) is provided with a water inlet (211) and a water outlet (212), and the heat exchange water tank (21) is provided with a third heat exchanger and a fourth heat exchanger (22), two ends of the third heat exchanger are connected to the refrigerant system (1) to make the refrigerant in the third heat exchanger exchange heat with the water in the heat exchange water tank (21), and two ends of the fourth heat exchanger (22) are communicated with a heating pipeline (23) and form a loop; The exhaust port of the compressor (11) is communicated with the inlet of the third heat exchanger, the outlet of the third heat exchanger is communicated with the first port of the first throttling device (141), the second port of the first throttling device (141) is communicated with the first port of the first heat exchanger (131), and the second port of the first heat exchanger (131) is respectively communicated with the suction port of the compressor (11) and the gas inlet of the ejector (15); The exhaust port of the ejector (15) is communicated with the gas inlet of the gas-liquid separator (16), the liquid outlet of the gas-liquid separator (16) is communicated with the first port of the second throttling device (142), the second port of the second throttling device (142) is communicated with the first inlet of the second heat exchanger (132), the first outlet of the second heat exchanger (132) is communicated with the suction port of the ejector (15), and the gas outlet of the gas-liquid separator (16) is communicated with the suction port of the compressor (11).

2. The air conditioning system of claim 1, wherein, The air conditioning system further comprises a first branch (10), the first branch (10) is arranged in parallel with the third heat exchanger, a first end of the first branch (10) is communicated on a pipeline between the exhaust port of the compressor (11) and the inlet of the third heat exchanger, and a second end of the first branch (10) is communicated on a pipeline between the outlet of the third heat exchanger and the first port of the first throttling device (141).

3. The air conditioning system of claim 2, wherein, The air conditioning system further comprises a first three-way valve (171), a first interface of the first three-way valve (171) is communicated with the exhaust port of the compressor (11), a second interface of the first three-way valve (171) is communicated with the first end of the first branch (10), and a third interface of the first three-way valve (171) is communicated with the inlet of the third heat exchanger.

4. The air conditioning system of claim 3, wherein, The air conditioning system further comprises a four-way valve (12), a first interface (a), a second interface (b), a third interface (c) and a fourth interface (d) of the four-way valve (12) are communicated with an exhaust port of the compressor (11), a second port of the first heat exchanger (131), a suction port of the compressor (11) and a first interface of the first three-way valve (171) respectively.

5. The air conditioning system of claim 4, wherein, The refrigerant system (1) further comprises a second three-way valve (172), a first interface, a second interface and a third interface of the second three-way valve (172) are communicated with the second port of the first heat exchanger (131), the second interface (b) of the four-way valve (12) and an air inlet of the ejector (15) respectively. An exhaust port of the gas-liquid separator (16) is communicated on a pipeline between the second interface of the second three-way valve (172) and the second interface (b) of the four-way valve (12).

6. The air conditioning system of claim 5, wherein, The refrigerant system (1) further comprises a control valve (18), a first port of the control valve (18) is communicated with the exhaust port of the gas-liquid separator (16), and a second port of the control valve (18) is communicated on the pipeline between the second interface of the second three-way valve (172) and the second interface (b) of the four-way valve (12).

7. The air conditioning system of claim 1, wherein The refrigerant system (1) further comprises a fifth heat exchanger (133), a first inlet of the fifth heat exchanger (133) is communicated with an exhaust port of the ejector (15), and a first outlet of the fifth heat exchanger (133) is communicated with an air inlet of the gas-liquid separator (16).

8. The air conditioning system of claim 7, wherein, The air conditioning system further comprises a second water system (3), the second water system (3) comprises an indoor heat exchanger (31), an outlet of the indoor heat exchanger (31) is communicated with a second inlet of the fifth heat exchanger (133), a second outlet of the fifth heat exchanger (133) is communicated with a second inlet of the second heat exchanger (132), and a second outlet of the second heat exchanger (132) is communicated with an inlet of the indoor heat exchanger (31).

9. The air conditioning system of claim 1, wherein, The air conditioning system further comprises a heat regenerator (19), a passage is formed between a first port and a second port of the heat regenerator (19), and a passage is formed between a third port and a fourth port of the heat regenerator (19); The first port of the heat regenerator (19) is communicated with an outlet of the third heat exchanger, the second port of the heat regenerator (19) is communicated with a first port of the first throttling device (141), the third port of the heat regenerator (19) is communicated with an exhaust port of the gas-liquid separator (16), and the fourth port of the heat regenerator (19) is communicated with a suction port of the compressor (11).

10. The air conditioning system of claim 1, wherein, The first water system (2) further comprises an expansion water tank (24) and a water pump (25), the fourth heat exchanger (22), the heating pipeline (23), the expansion water tank (24) and the water pump (25) are communicated with each other and form a loop.

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