Air conditioning heat pump system

Abstract

The present application relates to the technical field of air conditioning, in particular to an air conditioner heat pump system. The present application aims to solve the problem of low heating energy efficiency of the existing air conditioner heat pump system. To this end, the present application provides an air conditioner heat pump system, which comprises a refrigerant system and a first water system. The refrigerant used in the refrigerant system is carbon dioxide. The first water system comprises a heat exchange water tank, which is provided with a third heat exchanger and a fourth heat exchanger. The two ends of the third heat exchanger are connected to the refrigerant system. The two ends of the fourth heat exchanger are communicated with a heating pipeline and form a loop. In the case of using the above technical solution, the air conditioning system can realize the functions of refrigeration, hot water production and heating. It can still maintain good heating performance in an ultra-low temperature environment. The arrangement of the heat exchange water tank can combine the functions of hot water production and heating. In the case of ensuring the supply temperature of hot water and the heating temperature, the heat loss caused by multi-stage heat exchange is avoided, which is conducive to further improving the heating energy efficiency of the air conditioning system.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more specifically to an air conditioning heat pump system. Background Technology

[0002] An air conditioning heat pump 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 heat pump systems can also be used to provide domestic hot water and heat underfloor heating pipes.

[0003] However, existing air conditioning heat pump systems have low heating efficiency and cannot provide domestic hot water and heating for extended periods. Furthermore, the temperature of the domestic hot water they can provide is limited, and the heating efficiency of air conditioning heat pump systems will be further reduced in ultra-low temperature environments.

[0004] Accordingly, a new technical solution is needed in this field to solve the above problems. Summary of the Invention

[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 of existing air conditioning heat pump systems, this application provides an air conditioning heat pump system, which includes 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 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, and a gas-liquid separator 16.

[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] 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 inlet of the third heat exchanger, the suction port of the compressor 11 and the first port of the first heat exchanger 131.

[0008] The second port of the first heat exchanger 131 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 air inlet of the ejector 15, the exhaust port of the ejector 15 is connected to the air 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 air intake of the ejector 15, and the exhaust port of the gas-liquid separator 16 is connected to the air intake of the compressor 11.

[0009] The outlet of the third heat exchanger can be connected to the air inlet of the ejector 15 or the second port of the first throttling device 141.

[0010] In the preferred technical solution of the above-mentioned air conditioning heat pump 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.

[0011] In the preferred embodiment of the above-mentioned air conditioning heat pump system, the air conditioning heat pump system further includes a second water system 3, the second water system 3 including an indoor heat exchanger 31, the outlet of the indoor heat exchanger 31 being connected to the second inlet of the fifth heat exchanger 133, the second outlet of the fifth heat exchanger 133 being connected to the second inlet of the second heat exchanger 132, and the second outlet of the second heat exchanger 132 being connected to the inlet of the indoor heat exchanger 31; and / or

[0012] The second heat exchanger 132 and the fifth heat exchanger 133 are both located on the indoor side.

[0013] In the preferred technical solution of the above-mentioned air conditioning heat pump system, the refrigerant system 1 further includes a first three-way valve 171, wherein the first port, the second port and the third port of the first three-way valve 171 are respectively connected to the fourth port d of the four-way valve 12, the first port of the first heat exchanger 131 and the inlet of the third heat exchanger.

[0014] The second port b of the four-way valve 12 is connected to the pipeline between the third port of the first three-way valve 171 and the inlet of the third heat exchanger.

[0015] In the preferred embodiment of the above-mentioned air conditioning heat pump system, the refrigerant system 1 further includes a second three-way valve 172. The first port of the second three-way valve 172 is connected to the pipeline between the second port of the first throttling device 141 and the air inlet of the ejector 15. The second port of the second three-way valve 172 is connected to the pipeline between the second port of the first three-way valve 171 and the first port of the first heat exchanger 131. The third port of the second three-way valve 172 is connected to the outlet of the third heat exchanger.

[0016] In the preferred technical solution of the above-mentioned air conditioning heat pump system, the refrigerant system 1 further includes a first control valve 181 and a second control valve 182, wherein the first port and the second port of the first control valve 181 are respectively connected to the suction port of the compressor 11 and the exhaust port of the gas-liquid separator 16.

[0017] The third port c of the four-way valve 12 is connected to the pipeline between the first port of the first control valve 181 and the suction port of the compressor 11.

[0018] The first port of the second control valve 182 is connected to the second port b of the four-way valve 12, and the second port of the second control valve 182 is connected to the pipeline between the third port of the first three-way valve 171 and the inlet of the third heat exchanger.

[0019] In the preferred embodiment of the above-mentioned air conditioning heat pump system, the refrigerant system 1 further includes a third control valve 183 and a fourth control valve 184. The first port of the third control valve 183 is connected to the second port of the first throttling device 141, the second port of the third control valve 183 is connected to the first port of the fourth control valve 184, the second port of the fourth control valve 184 is connected to the air inlet of the ejector 15, and the outlet of the third heat exchanger is connected to the pipeline between the second port of the third control valve 183 and the first port of the fourth control valve 184; or

[0020] The refrigerant system 1 also includes a third three-way valve, the first port of which is connected to the second port of the first throttling device 141, the second port of which is connected to the outlet of the third heat exchanger, and the third port of which is connected to the inlet of the ejector 15.

[0021] In the preferred technical solution of the above-mentioned air conditioning heat pump system, the refrigerant system 1 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.

[0022] The first port of the regenerator 19 is connected to the second port of the first throttling device 141, the second port of the regenerator 19 is connected to the air inlet of the ejector 15, the third port of the regenerator 19 is connected to the air intake of the compressor 11, and the fourth port of the regenerator 19 is connected to the exhaust port of the gas-liquid separator 16.

[0023] In the preferred embodiment of the above-mentioned air conditioning heat pump system, the first control valve 181 and / or the second control valve 182 are configured as one-way valves.

[0024] In the preferred technical solution of the above-mentioned air conditioning heat pump system, the first water system 2 further includes an expansion tank 24 and a water pump 25, and the fourth heat exchanger 22, the heating pipe 23, the expansion tank 24 and the water pump 25 are interconnected and form a loop.

[0025] With the above technical solution, the air conditioning system can realize three functions: cooling, hot water production, and heating. Moreover, CO2 refrigerant can still maintain good heating performance in ultra-low temperature environments, thereby improving the heating efficiency of the air conditioner. The hot water exchange tank 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. Attached Figure Description

[0026] The air conditioning heat pump system of this application will now be described with reference to the accompanying drawings. In the drawings:

[0027] Figure 1 This is a structural diagram of the air conditioning heat pump system of this application;

[0028] Figure 2 This is a schematic diagram of the air conditioning heat pump system of this application.

[0029] Figure 3 This is a schematic diagram of the hot water production and heating of the air conditioning heat pump system of this application;

[0030] Figure 4 This is a schematic diagram of the cooling and hot water production of the first embodiment of the air conditioning heat pump system of this application;

[0031] Figure 5 This is a schematic diagram of the cooling and hot water production of a second embodiment of the air conditioning heat pump system of this application;

[0032] Figure 6 This is a schematic diagram of the cooling and hot water production of the third embodiment of the air conditioning heat pump system of this application;

[0033] Figure 7 This is a schematic diagram of the cooling and hot water production of the fourth embodiment of the air conditioning heat pump system of this application.

[0034] List of reference numerals

[0035] 1. Refrigerant system; 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; 181. First control valve; 182. Second control valve; 183. Third control valve; 184. Fourth control valve; 19. Regenerator;

[0036] 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;

[0037] 3. Second water system; 31. Indoor heat exchanger. Detailed Implementation

[0038] 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.

[0039] 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.

[0040] 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.

[0041] As described in the background section, an air conditioning heat pump 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 heat pump systems can also be used to provide domestic hot water and heat underfloor heating pipes.

[0042] However, existing air conditioning heat pump systems have low heating efficiency and cannot provide domestic hot water and heating for extended periods. Furthermore, the temperature of the domestic hot water they can provide is limited, and the heating efficiency of air conditioning heat pump systems will be further reduced in ultra-low temperature environments.

[0043] To address the low heating efficiency of existing air conditioning heat pump systems, this application provides an air conditioning heat pump 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 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, and a gas-liquid separator 16. 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 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 circuit. The four-way valve 12 has its first port a, second port b, third port c, and fourth port d connected to the exhaust port of the compressor 11, the inlet of the third heat exchanger, the suction port of the compressor 11, and the first port of the first heat exchanger 131, respectively. The second port of the first heat exchanger 131 is connected to the first port of the first throttling device 141, which is also connected to the inlet of the ejector 15. The exhaust port of the ejector 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, which 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 ejector 15, and the exhaust port of the gas-liquid separator 16 is connected to the suction port of the compressor 11. The outlet of the third heat exchanger can be connected to either the inlet of the ejector 15 or the second port of the first throttling device 141.

[0044] With the above technical solution, the air conditioning system can realize three functions: cooling, hot water production, and heating. The CO2 refrigerant can still 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.

[0045] The following reference Figure 1 The air conditioning heat pump system of this application will be described below. Figure 1 This is a structural diagram of the air conditioning heat pump system of this application.

[0046] In a preferred embodiment, such as Figure 1As shown, the air conditioning heat pump 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 compressor 11, a four-way valve 12, a first heat exchanger 131, a second heat exchanger 132, a fifth heat exchanger 133, 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 first control valve 181, a second control valve 182, a third control valve 183, a fourth control valve 184, and a regenerator 19. The first control valve 181 and the second control valve 182 are both set as one-way valves, the third control valve 183 and the fourth control valve 184 are both set as solenoid valves, and the second heat exchanger 132 and the fifth heat exchanger 133 are both located on the indoor side.

[0047] 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.

[0048] Specifically, the discharge port of compressor 11 is connected to the first port a of four-way valve 12; the third port c of four-way valve 12 is connected to the suction port of compressor 11; the fourth port d of four-way valve 12 is connected to the first port (left port in the diagram) of first three-way valve 171; the second port (middle port in the diagram) of first three-way valve 171 is connected to the first port (upper port in the diagram) of first heat exchanger 131; the third port (right port in the diagram) of first three-way valve 171 is connected to the inlet of third heat exchanger; and the second port b of four-way valve 12 is connected to the first port (in the diagram) of second control valve 182. The upper interface of the first three-way valve 171 is connected to the pipeline between the third interface of the first three-way valve 171 and the inlet of the third heat exchanger. The outlet of the third heat exchanger is connected to the third interface of the second three-way valve 172 (the right interface of the first three-way valve 172). The second interface of the second three-way valve 172 (the middle interface of the first three-way valve 172) is connected to the pipeline between the second interface of the first three-way valve 171 and the first port of the first heat exchanger 131. The second port of the first heat exchanger 131 is connected to the first port of the first throttling device 141 (the upper interface of the first throttling device 141).

[0049] A passage is formed between the first port (upper left interface in the diagram) and the second port (lower left interface in the diagram) of the regenerator 19, and a passage is formed between the third port (upper right interface in the diagram) and the fourth port (lower right interface in the diagram) of the regenerator 19. The second port (lower side interface in the diagram) of the first throttling device 141 is connected to the first port of the regenerator 19. The second port of the regenerator 19 is connected to the first port (upper side interface in the diagram) of the third control valve 183. The second port (lower side interface in the diagram) of the third control valve 183 is connected to the first port (left side interface in the diagram) of the fourth control valve 184. The first interface (left side interface in the diagram) of the second three-way valve 172 is connected to the pipeline between the second port of the third control valve 183 and the first port of the fourth control valve 184.

[0050] The second port (right side interface in the diagram) of the fourth control valve 184 is connected to the air inlet of the ejector 15. The exhaust port of the 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 air inlet of the gas-liquid separator 16. The drain port of the 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. The first outlet (upper left interface in the diagram) of the second heat exchanger 132 is connected to the air intake of the ejector 15. The exhaust port of the gas-liquid separator 16 is connected to the fourth port of the regenerator 19, the third port of the regenerator 19 is connected to the second port (lower interface in the direction shown in the figure) of the first control valve 181, the first port (upper interface in the direction shown in the figure) of the first control valve 181 is connected to the suction port of the compressor 11, and the third interface c of the four-way valve 12 is connected to the pipeline between the first port of the first control valve 181 and the suction port of the compressor 11.

[0051] 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).

[0052] The following reference Figure 2 To describe the refrigerant flow direction in cooling mode. Figure 2 This is a schematic diagram of the air conditioning heat pump system of this application.

[0053] like Figure 2 As shown, when only cooling is required, the first port a of the four-way valve 12 is connected to the fourth port d, the first port of the first three-way valve 171 is connected to the second port, all three ports of the second three-way valve 172 are kept closed, the first throttling device 141 is kept fully open, the second throttling device 142 is opened to a certain degree, and the third control valve 183 and the fourth control valve 184 are both kept open.

[0054] 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 second port of the first three-way valve 171, before entering the first heat exchanger 131 to release heat. It then passes through the first throttling device 141 and enters the regenerator 19 for heat exchange. Afterward, the refrigerant passes through the third control valve 183 and the fourth control valve 184, and as a motive fluid, enters the ejector 15. Simultaneously, the ejector 15 draws in the refrigerant gas generated by the heat absorption of the second heat exchanger 132. The gas-liquid two-phase refrigerant mixes and is then ejected through the ejector 15 to the fifth heat exchanger 133. The refrigerant in the fifth heat exchanger 133... The refrigerant absorbs heat and vaporizes. 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 fourth port, the third port, and the first control valve 181 of the regenerator 19. 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 the ejector 15. This cycle repeats to complete the refrigeration. The circuit formed by the ejector 15, the second heat exchanger 132, the fifth heat exchanger 133, the gas-liquid separator 16, and the second throttling device 142 is referred to as the jet refrigeration circuit.

[0055] In addition, the water pump in the second water system 3 is in the on state. At this time, the water flow first achieves initial cooling through the second inlet and second outlet of the fifth heat exchanger 133, and then achieves further cooling through the second inlet and second outlet of the second heat exchanger 132. Then, the cooled water flows into the indoor heat exchanger 31, and the cooling capacity is transferred to the room by the fan. In this embodiment, when the second heat exchanger 132 and the fifth heat exchanger 133 are set on the indoor side, the two heat exchangers can be integrated, and the second heat exchanger 132 and the fifth heat exchanger 133 can also have a dehumidification function when cooling the room.

[0056] The following reference Figure 3 This describes the refrigerant flow direction under hot water production and heating modes. Figure 3 This is a schematic diagram of the hot water production and heating of the air conditioning heat pump system of this application.

[0057] like Figure 3As 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 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 second port, the first port of the second three-way valve 172 is connected to the third port, the first throttling device 141 is opened to a certain degree, the third control valve 183 is in the open state, and the fourth control valve 184 is in the closed state.

[0058] The compressor 11 compresses the refrigerant into a high-temperature, high-pressure refrigerant gas. This gas passes sequentially through the first port a and second port b of the four-way valve 12, and then through the second control valve 182 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 third port and first port of the second three-way valve 172, the third control valve 183, the second port and 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 second port and first port of the first three-way valve 171, and the fourth port d and third port c of the four-way valve 12.

[0059] 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, and can simultaneously meet the requirements for the supply temperature of domestic hot water and the 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.

[0060] See below. Figures 4 to 7 This describes the refrigerant flow direction in hot water and cooling modes. Figure 4 This is a schematic diagram of the cooling and hot water production of the first embodiment of the air conditioning heat pump system of this application; Figure 5 This is a schematic diagram of the cooling and hot water production of a second embodiment of the air conditioning heat pump system of this application; Figure 6 This is a schematic diagram of the cooling and hot water production of the third embodiment of the air conditioning heat pump system of this application; Figure 7 This is a schematic diagram of the cooling and hot water production of the fourth embodiment of the air conditioning heat pump system of this application.

[0061] like Figure 4 and Figure 5As shown, in one possible implementation, the second throttling device 142 is opened to a certain degree, the third control valve 183 is in the closed state, and the fourth control valve 184 is in the open state. Figure 4 As shown, the high-temperature, high-pressure refrigerant gas discharged from compressor 11 can enter the third heat exchanger through the first port a and the second port b of the four-way valve 12, or, as... Figure 5 As shown, the refrigerant enters the third heat exchanger 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. The first port and the third port of the second three-way valve 172 are connected, and the refrigerant flowing out of the third heat exchanger enters the injection refrigeration circuit through the second three-way valve 172 and the fourth control valve 184. The gaseous refrigerant discharged from the exhaust port of the gas-liquid separator 16 passes through the regenerator 19 and the first control valve 181 in sequence and returns to the compressor 11.

[0062] like Figure 6 As shown, in one possible implementation, the first port a of the four-way valve 12 is connected to the fourth port d, 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, the second throttling device 142 is opened to a certain degree, and the third control valve 183 and the fourth control valve 184 are both in the open state.

[0063] The compressor 11 compresses the refrigerant into a high-temperature, high-pressure refrigerant gas. The high-temperature, high-pressure refrigerant gas is divided into two paths after passing through the first port a and the fourth port d of the four-way valve 12 and the first three-way valve 171. One path of refrigerant flows through the third heat exchanger to produce hot water, while the other path of refrigerant flows directly to the first heat exchanger 131 to release heat. Then, the two paths of refrigerant merge and return to the compressor 11 after passing through the injection refrigeration circuit to achieve refrigeration.

[0064] like Figure 7 As shown, the first port a of the four-way valve 12 is connected to the fourth port d, the first port of the first three-way valve 171 is connected to the third port, the second port of the second three-way valve 172 is connected to the third port, the first throttling device 141 is kept fully open, the second throttling device 142 is opened to a certain degree, and the third control valve 183 and the fourth control valve 184 are both kept open.

[0065] The high-temperature and high-pressure refrigerant gas discharged from the compressor 11 can enter the third heat exchanger to release heat 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. The refrigerant flowing out from the third heat exchanger enters the injection refrigeration circuit through the second three-way valve 172, the first heat exchanger 131, the first throttling device 141, the regenerator 19, the third control valve 183, and the fourth control valve 184, and returns to the compressor 11 after achieving refrigeration.

[0066] It should be explained that in this embodiment, multiple functions can be achieved independently or simultaneously through the aforementioned multiple components. However, the system settings are not static, and those skilled in the art can omit or modify the specific settings of each component according to their needs. In one possible embodiment, the first three-way valve 171 and the second three-way valve 172 can be omitted. In this case, the fourth port d of the four-way valve 12 is directly connected to the first port of the first heat exchanger 131, the second port b of the four-way valve 12 is directly connected to the inlet of the third heat exchanger, and the outlet of the third heat exchanger is directly connected to the pipeline between the third control valve 183 and the fourth control valve 184. Figures 2-4 The refrigerant flow direction can also achieve the functions of cooling only, hot water and heating only, or hot water and cooling simultaneously. Of course, the first three-way valve 171 and the second three-way valve 172 can also be set as multiple two-way valves, as long as it does not affect the normal functioning of this application.

[0067] In addition, 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 necessary. The exhaust port of the ejector 15 can be directly connected to the air inlet of the gas-liquid separator 16. However, considering the cooling efficiency, the fifth heat exchanger 133 is a better choice because it can initially cool the water flow in the second water system 3, thereby improving the cooling efficiency of the air conditioner. Furthermore, since indoor cooling can be achieved through the second water system 3 in this embodiment, it is not necessary to place the second heat exchanger 132 and the fifth heat exchanger 133 on the indoor side. However, considering that placing the second heat exchanger 132 and the fifth heat exchanger 133 on the outdoor side would result in a loss of cooling capacity when transferring cold energy from the outdoor to the indoor side, thereby reducing the cooling efficiency of the air conditioner, and considering that placing the second heat exchanger 132 and the fifth heat exchanger 133 on the indoor side can also achieve indoor dehumidification, placing the second heat exchanger 132 and the fifth heat exchanger 133 on the indoor side is a better choice. Of course, the placement of the second water system 3 is not fixed. In an alternative embodiment, the second water system 3 can be omitted, and in this case, 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 indoor side. In another alternative embodiment, when a second water system 3 is provided, the second water system 3 can be provided with a plurality of indoor heat exchangers 31, and the plurality of indoor heat exchangers 31 are arranged in parallel.

[0068] It should also be explained that the configuration of the first control valve 181, the second control valve 182, the third control valve 183, and the fourth control valve 184 is not fixed. Those skilled in the art can modify their specific configurations according to requirements. In one alternative embodiment, the first control valve 181 or the second control valve 182 can be configured as a solenoid valve, an electric ball valve, an electric butterfly valve, etc., or the third control valve 183 or the fourth control valve 184 can be configured as an electric ball valve, an electric butterfly valve, etc. In another alternative embodiment, the third control valve 183 and the fourth control valve 184 can be replaced with a third three-way valve, whose three ports are respectively connected to the second port of the regenerator 19, the air inlet of the ejector 15, and the first port of the second three-way valve 172. Alternatively, the first control valve 181 can be configured as a fourth three-way valve, whose three ports are respectively connected to the suction port of the compressor 11, the third port of the regenerator 19, and the third port c of the four-way valve 12. In addition, the installation of the regenerator 19 is not mandatory, but considering that the regenerator 19 can achieve supercooling and superheating, thereby improving the cooling efficiency of the air conditioner, it is a better choice.

[0069] 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.

[0070] 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.

[0071] 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 heat pump system, characterized in that, The air conditioning heat pump system includes 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 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, and a gas-liquid separator 16. 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. 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 inlet of the third heat exchanger, the suction port of the compressor 11 and the first port of the first heat exchanger 131. The second port of the first heat exchanger 131 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 air inlet of the ejector 15, the exhaust port of the ejector 15 is connected to the air 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 air intake of the ejector 15, and the exhaust port of the gas-liquid separator 16 is connected to the air intake of the compressor 11. The outlet of the third heat exchanger can be connected to the air inlet of the ejector 15 or the second port of the first throttling device 141.

2. The air conditioning heat pump system according to claim 1, characterized in that, The refrigerant system 1 also includes a fifth heat exchanger 133, the first inlet of which is connected to the exhaust port of the ejector 15, and the first outlet of which is connected to the air inlet of the gas-liquid separator 16.

3. The air conditioning heat pump system according to claim 2, characterized in that, The air conditioning heat pump system further includes a second water system 3, which 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, and the second outlet of the fifth heat exchanger 133 is connected to the second inlet of the second heat exchanger 132. The second outlet of the second heat exchanger 132 is connected to the inlet of the indoor heat exchanger 31; and / or The second heat exchanger 132 and the fifth heat exchanger 133 are both located on the indoor side.

4. The air conditioning heat pump system according to claim 1, characterized in that, The refrigerant system 1 also includes a first three-way valve 171, the first port, the second port and the third port of the first three-way valve 171 being connected to the fourth port d of the four-way valve 12, the first port of the first heat exchanger 131 and the inlet of the third heat exchanger, respectively. The second port b of the four-way valve 12 is connected to the pipeline between the third port of the first three-way valve 171 and the inlet of the third heat exchanger.

5. The air conditioning heat pump system according to claim 4, characterized in that, The refrigerant system 1 further includes a second three-way valve 172. The first port of the second three-way valve 172 is connected to the pipeline between the second port of the first throttling device 141 and the air inlet of the injector 15. The second port of the second three-way valve 172 is connected to the pipeline between the second port of the first three-way valve 171 and the first port of the first heat exchanger 131. The third port of the second three-way valve 172 is connected to the outlet of the third heat exchanger.

6. The air conditioning heat pump system according to claim 4, characterized in that, The refrigerant system 1 further includes a first control valve 181 and a second control valve 182, wherein the first port and the second port of the first control valve 181 are respectively connected to the suction port of the compressor 11 and the exhaust port of the gas-liquid separator 16. The third port c of the four-way valve 12 is connected to the pipeline between the first port of the first control valve 181 and the suction port of the compressor 11. The first port of the second control valve 182 is connected to the second port b of the four-way valve 12, and the second port of the second control valve 182 is connected to the pipeline between the third port of the first three-way valve 171 and the inlet of the third heat exchanger.

7. The air conditioning heat pump system according to claim 1, characterized in that, The refrigerant system 1 further includes a third control valve 183 and a fourth control valve 184. The first port of the third control valve 183 is connected to the second port of the first throttling device 141, and the second port of the third control valve 183 is connected to the first port of the fourth control valve 184. The second port of the fourth control valve 184 is connected to the air inlet of the injector 15. The outlet of the third heat exchanger is connected to the pipeline between the second port of the third control valve 183 and the first port of the fourth control valve 184; or The refrigerant system 1 also includes a third three-way valve, the first port of which is connected to the second port of the first throttling device 141, the second port of which is connected to the outlet of the third heat exchanger, and the third port of which is connected to the inlet of the ejector 15.

8. The air conditioning heat pump system according to claim 1, characterized in that, The refrigerant system 1 also 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. The first port of the regenerator 19 is connected to the second port of the first throttling device 141, the second port of the regenerator 19 is connected to the air inlet of the ejector 15, the third port of the regenerator 19 is connected to the air intake of the compressor 11, and the fourth port of the regenerator 19 is connected to the exhaust port of the gas-liquid separator 16.

9. The air conditioning heat pump system according to claim 6, characterized in that, The first control valve 181 and / or the second control valve 182 are configured as check valves.

10. The air conditioning heat pump system according to claim 1, characterized in that, The first water system 2 also 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.

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