Air conditioner and heat pump water heater combined heat pump system, control method and control device

Abstract

The invention discloses a combined heat pump system of an air conditioner and a heat pump water heater, a control method and a control device.The combined heat pump system comprises a compressor, an outdoor heat exchanger, an indoor heat exchanger, a four-way valve, a water tank heat exchanger and a three-way valve, the three-way valve is used for adjusting the refrigerant flow direction of the water tank heat exchanger, the four-way valve is used for adjusting the refrigerant flow direction of the outdoor heat exchanger and the indoor heat exchanger, and the heat exchange sequence of refrigerants in the heat exchangers is changed by changing the conduction state of the three-way valve and the conduction state of the four-way valve. The combined heat pump system can meet the functional requirements of air conditioner adjustment and hot water preparation, and the energy utilization rate is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pump systems, and in particular to a combined heat pump system of an air conditioner and a heat pump water heater, a control method and a control device. Background Art

[0002] At present, air conditioners and water heaters are usually independent systems. If both are installed at the same time, it will not only take up a lot of space, be troublesome to install, but also have low energy utilization. Therefore, in the air conditioning system of the related technology, a water-cooled outdoor heat exchanger is used. When the air conditioner is in cooling mode, the water can be heated while exchanging heat through the outdoor heat exchanger, which improves the thermal energy utilization. However, the preparation of hot water and the heating of the air conditioner are limited, and it is impossible to meet the requirements of air conditioning and hot water preparation at the same time. Therefore, how to achieve the compatibility of the heat pump system with the requirements of air conditioning and hot water preparation has become an urgent problem to be solved. Summary of the invention

[0003] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art, and to provide a combined heat pump system, control method and control device of an air conditioner and a heat pump water heater, which can be compatible with the functional requirements of air conditioning regulation and hot water preparation and improve energy utilization.

[0004] In a first aspect, an embodiment of the present invention provides a combined heat pump system of an air conditioner and a heat pump water heater, comprising:

[0005] A compressor, including a suction port and a discharge port;

[0006] Outdoor heat exchanger;

[0007] An indoor heat exchanger connected to the outdoor heat exchanger;

[0008] A four-way valve, comprising a first end connected to the exhaust port, a second end connected to the air intake port, a third end connected to the outdoor heat exchanger, and a fourth end connected to the indoor heat exchanger;

[0009] A water tank heat exchanger, comprising a water tank refrigerant inlet and a water tank refrigerant outlet, wherein the water tank refrigerant outlet is connected to a first connection point, and the first connection point is located in a refrigerant pipeline between the indoor heat exchanger and the outdoor heat exchanger;

[0010] The three-way valve includes a fifth end connected to the exhaust port, a sixth end connected to the intake port, and a seventh end connected to the refrigerant inlet of the water tank.

[0011] The combined heat pump system provided according to the embodiment of the present invention has at least the following beneficial effects: a water tank heat exchanger, a three-way valve and a four-way valve are added on the basis of a compressor, an outdoor heat exchanger and an indoor heat exchanger; the water tank heat exchanger is connected in parallel with the outdoor heat exchanger; the three-way valve can be used to adjust the refrigerant flow direction of the water tank heat exchanger; the four-way valve can be used to adjust the refrigerant flow direction of both the outdoor heat exchanger and the indoor heat exchanger; compared with the solution in the related art in which the combined refrigerant system is limited by the fixed refrigerant circuit and cannot be compatible with the needs of air conditioning and hot water preparation at the same time, the embodiment of the present invention optimizes the connection relationship between each heat exchanger in the combined heat pump system and expands a variety of different refrigerant circuits, thereby being able to change the heat exchange sequence of the refrigerant in each heat exchanger; therefore, it is helpful to subsequently adjust the flow direction of the refrigerant in the outdoor heat exchanger, the indoor heat exchanger and the water tank heat exchanger by switching the connectivity of the three-way valve and the four-way valve, thereby realizing a variety of operating modes of the combined heat pump system, being compatible with the functional requirements of air conditioning and hot water preparation, and improving energy utilization.

[0012] According to the combined heat pump system provided by some embodiments of the present invention, a first control valve is provided between the first connection point and the refrigerant outlet of the water tank.

[0013] According to the combined heat pump system provided by some embodiments of the present invention, a second control valve is provided between the first connection point and the indoor heat exchanger, and a third control valve is provided between the first connection point and the outdoor heat exchanger.

[0014] According to the combined heat pump system provided in some embodiments of the present invention, the compressor also includes an enthalpy spray port, and the combined heat pump system also includes a first flash evaporator, the first flash evaporator includes a first flash refrigerant inlet connected to the indoor heat exchanger, a first flash refrigerant outlet connected to the enthalpy spray port, and a second flash refrigerant outlet connected to the outdoor heat exchanger.

[0015] According to some embodiments of the present invention, the combined heat pump system further includes a second flash evaporator, the second flash evaporator including a second flash refrigerant inlet connected to the indoor heat exchanger, a third flash refrigerant outlet connected to the fourth end, and a fourth flash refrigerant outlet connected to the first connection point.

[0016] According to some embodiments of the present invention, the combined heat pump system further includes an ejector, wherein the ejector includes an ejection outlet connected to the indoor heat exchanger, a first ejection inlet connected to the outdoor heat exchanger, and a second ejection inlet connected to the fourth flash refrigerant outlet.

[0017] According to some embodiments of the present invention, the combined heat pump system further includes a regenerator, which includes a first heat exchange branch and a second heat exchange branch, the inlet of the first heat exchange branch is connected to the outdoor heat exchanger, the outlet of the first heat exchange branch and the inlet of the second heat exchange branch are respectively connected to two ends of the indoor heat exchanger, and the outlet of the second heat exchange branch is connected to the fourth end.

[0018] In a second aspect, an embodiment of the present invention provides a control method for a combined heat pump system of an air conditioner and a heat pump water heater, which is applied to the combined heat pump system described in the embodiment of the first aspect, and the control method includes:

[0019] determining an operating mode of the combined heat pump system;

[0020] According to the operation mode, the four-way valve and the three-way valve are controlled respectively to adjust the flow direction of the refrigerant in the combined heat pump system.

[0021] The control method of the combined heat pump system of air conditioning and heat pump water heater provided according to the embodiment of the present invention has at least the following beneficial effects: since the water tank heat exchanger is connected in parallel with the outdoor heat exchanger, the three-way valve can be used to adjust the refrigerant flow direction of the water tank heat exchanger, and the four-way valve can be used to adjust the refrigerant flow direction of both the outdoor heat exchanger and the indoor heat exchanger. Compared with the combined refrigerant system in the related art, which is limited by the fixed refrigerant circuit and cannot be compatible with the needs of air conditioning and hot water preparation at the same time, the embodiment of the present invention can realize a variety of different refrigerant circuits by switching the connectivity between the three-way valve and the four-way valve after determining the operation mode of the combined heat pump system, and adjust the flow direction of the refrigerant in the outdoor heat exchanger, the indoor heat exchanger and the water tank heat exchanger, so as to change the heat exchange order of the refrigerant in each heat exchanger, realize a variety of operation modes of the combined heat pump system, be compatible with the functional requirements of air conditioning and hot water preparation, and improve energy utilization.

[0022] In the control method provided according to some embodiments of the present invention, when the operating mode is the defrost mode, the three-way valve is controlled to connect the seventh end with the sixth end, the second control valve is controlled to be closed, and the four-way valve is controlled to connect the first end with the third end and the second end with the fourth end.

[0023] In the control method provided according to some embodiments of the present invention, when the operation mode is the cooperative cooling mode, the three-way valve is controlled to connect the fifth end with the seventh end, and the four-way valve is controlled to connect the first end with the third end and the second end with the fourth end;

[0024] or,

[0025] When the operation mode is the cooperative heating mode, the three-way valve is controlled to connect the fifth end with the seventh end, and the four-way valve is controlled to connect the first end with the fourth end and the second end with the third end.

[0026] In the control method provided according to some embodiments of the present invention, when the operation mode is the independent cooling mode, the three-way valve is controlled to connect the sixth end with the seventh end, the four-way valve is controlled to connect the first end with the third end and the second end with the fourth end, and the first control valve is controlled to be closed;

[0027] or,

[0028] When the operation mode is the independent heating mode, the three-way valve is controlled to connect the sixth end and the seventh end, the four-way valve is controlled to connect the first end and the fourth end and the second end and the third end, and the first control valve is controlled to be closed.

[0029] In the control method provided according to some embodiments of the present invention, when the operation mode is an independent hot water mode, the three-way valve is controlled to connect the fifth end with the seventh end, the four-way valve is controlled to connect the first end with the fourth end and the second end with the third end, and the opening of the third control valve is controlled so that the opening of the third control valve is less than a preset opening threshold.

[0030] In a third aspect, an embodiment of the present invention provides an operation control device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement a control method for a combined heat pump system of an air conditioner and a heat pump water heater as described in the embodiment of the second aspect above.

[0031] The operation control device provided according to the embodiment of the present invention has at least the following beneficial effects: since the water tank heat exchanger is connected in parallel with the outdoor heat exchanger, the three-way valve can be used to adjust the refrigerant flow direction of the water tank heat exchanger, and the four-way valve can be used to adjust the refrigerant flow direction of both the outdoor heat exchanger and the indoor heat exchanger. Compared with the combined refrigerant system in the related art, which is limited by the fixed refrigerant circuit and cannot be compatible with the needs of air conditioning and hot water preparation at the same time, the embodiment of the present invention can realize a variety of different refrigerant circuits by switching the connectivity between the three-way valve and the four-way valve after determining the operation mode of the combined heat pump system, and adjust the flow direction of the refrigerant in the outdoor heat exchanger, the indoor heat exchanger and the water tank heat exchanger, thereby changing the heat exchange order of the refrigerant in each heat exchanger, realizing a variety of operation modes of the combined heat pump system, being compatible with the functional requirements of air conditioning and hot water preparation, and improving energy utilization.

[0032] In a fourth aspect, an embodiment of the present invention provides a combined heat pump system of an air conditioner and a heat pump water heater, comprising the operation control device described in the embodiment of the third aspect.

[0033] The combined heat pump system of an air conditioner and a heat pump water heater provided according to an embodiment of the present invention has at least the following beneficial effects: since the water tank heat exchanger is connected in parallel with the outdoor heat exchanger, the three-way valve can be used to adjust the refrigerant flow direction of the water tank heat exchanger, and the four-way valve can be used to adjust the refrigerant flow direction of both the outdoor heat exchanger and the indoor heat exchanger. Compared with the combined refrigerant system in the related art, which is limited by the fixed refrigerant circuit and cannot be compatible with the needs of air conditioning and hot water preparation at the same time, the embodiment of the present invention can realize a variety of different refrigerant circuits by switching the connectivity between the three-way valve and the four-way valve after determining the operating mode of the combined heat pump system, and adjust the flow direction of the refrigerant in the outdoor heat exchanger, the indoor heat exchanger and the water tank heat exchanger, thereby changing the heat exchange order of the refrigerant in each heat exchanger, realizing a variety of operating modes of the combined heat pump system, being compatible with the functional requirements of air conditioning and hot water preparation, and improving energy utilization.

[0034] In a fifth aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the communication detection method as described in the embodiment of the first aspect above.

[0035] The computer-readable storage medium provided according to the embodiment of the present invention has at least the following beneficial effects: since the water tank heat exchanger is connected in parallel with the outdoor heat exchanger, the three-way valve can be used to adjust the refrigerant flow direction of the water tank heat exchanger, and the four-way valve can be used to adjust the refrigerant flow direction of both the outdoor heat exchanger and the indoor heat exchanger. Compared with the combined refrigerant system in the related art, which is limited by the fixed refrigerant circuit and cannot be compatible with the needs of air conditioning and hot water preparation at the same time, the embodiment of the present invention can realize a variety of different refrigerant circuits by switching the connectivity between the three-way valve and the four-way valve after determining the operation mode of the combined heat pump system, and adjust the flow direction of the refrigerant in the outdoor heat exchanger, the indoor heat exchanger and the water tank heat exchanger, thereby changing the heat exchange order of the refrigerant in each heat exchanger, realizing a variety of operation modes of the combined heat pump system, being compatible with the functional requirements of air conditioning and hot water preparation, and improving energy utilization.

[0036] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention and do not constitute a limitation to the technical solution of the present invention.

[0038] The present invention is further described below in conjunction with the accompanying drawings and embodiments;

[0039] Figure 1 is a structural schematic diagram of a combined heat pump system provided by an embodiment of the present invention;

[0040] Figure 2 is a structural schematic diagram of a combined heat pump system provided by another embodiment of the present invention;

[0041] Figure 3 is a structural schematic diagram of a combined heat pump system provided by another embodiment of the present invention;

[0042] Figure 4 is a flow chart of a control method of a combined heat pump system provided by an embodiment of the present invention;

[0043] Figure 5 It is a specific flow chart of the defrosting mode of the combined heat pump system provided by the embodiment of the present invention;

[0044] Figure 6 It is a specific flow chart of the combined heat pump system operating in the cooperative cooling mode provided by an embodiment of the present invention;

[0045] Figure 7 It is a specific flow chart of the combined heat pump system provided by the embodiment of the present invention operating in a collaborative heating mode;

[0046] Figure 8 It is a specific flow chart of the combined heat pump system provided by the embodiment of the present invention operating in an independent cooling mode;

[0047] Fig. 9 It is a specific flow chart of the combined heat pump system provided by the embodiment of the present invention operating in an independent heating mode;

[0048] Fig.10 It is a specific flow chart of the combined heat pump system provided by the embodiment of the present invention operating in an independent hot water mode;

[0049] Fig.11 It is a structural schematic diagram of an operation control device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0050] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0051] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, "above", "below", "within", etc. are understood to include the number itself, "at least one" means one or more, "at least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. If there is a description of the first and the second, it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0052] It should be noted that the terms such as setting, installing, and connecting in the embodiments of the present invention should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the embodiments of the present invention in combination with the specific content of the technical solution. For example, the term "connection" can be a mechanical connection, an electrical connection, or mutual communication; it can be directly connected or indirectly connected through an intermediate medium.

[0053] It should be noted that the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0054] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0055] At present, air conditioners and water heaters are usually independent systems. If both are installed at the same time, it will not only take up a large space, but also be troublesome to install and have low energy utilization rate. Therefore, a water-cooled outdoor heat exchanger is used in the air-conditioning system of the relevant technology. When the air conditioner is in cooling mode, the water can be heated while exchanging heat through the outdoor heat exchanger, thereby improving the thermal energy utilization rate. However, the preparation of hot water and the heating of the air conditioner will be limited. That is, this combined refrigerant system can only prepare hot water when operating in cooling mode, and cannot simultaneously meet the needs of air conditioning and hot water preparation.

[0056] Based on this, the present invention provides a combined heat pump system of an air conditioner and a heat pump water heater, a control method and a control device. A water tank heat exchanger, a three-way valve and a four-way valve are added on the basis of a compressor, an outdoor heat exchanger and an indoor heat exchanger. The water tank heat exchanger is connected in parallel with the outdoor heat exchanger. The three-way valve can be used to adjust the refrigerant flow direction of the water tank heat exchanger, and the four-way valve can be used to adjust the refrigerant flow direction of both the outdoor heat exchanger and the indoor heat exchanger. Compared with the solution in the related art that the combined refrigerant system is limited by the fixed refrigerant circuit and cannot be compatible with the needs of air conditioning and hot water preparation at the same time, the embodiment of the present invention optimizes the connection relationship between each heat exchanger in the combined heat pump system and expands a variety of different refrigerant circuits, so that the heat exchange sequence of the refrigerant in each heat exchanger can be changed. Therefore, it is helpful to subsequently adjust the flow direction of the refrigerant in the outdoor heat exchanger, the indoor heat exchanger and the water tank heat exchanger by switching the connectivity of the three-way valve and the four-way valve, so as to realize multiple operation modes of the combined heat pump system, be compatible with the functional requirements of air conditioning and hot water preparation, and improve energy utilization.

[0057] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0058] Reference Figure 1 , a schematic structural diagram of a combined heat pump system of an air conditioner and a heat pump water heater provided by an embodiment of the present invention.

[0059] It can be understood that the combined heat pump system includes a compressor 100 , an outdoor heat exchanger 200 , an indoor heat exchanger 300 , a four-way valve 400 , a water tank heat exchanger 500 and a three-way valve 600 , wherein the compressor 100 includes an air intake port 102 and an air exhaust port 101 .

[0060] The four-way valve 400 includes a first end 401, a second end 402, a third end 403 and a fourth end 404, wherein the first end 401 is connected to the exhaust port 101, the second end 402 is connected to the intake port 102, the third end 403 is connected to the outdoor heat exchanger 200, and the fourth end 404 is connected to the indoor heat exchanger 300.

[0061] The water tank heat exchanger 500 includes a water tank refrigerant inlet 501 and a water tank refrigerant outlet 502, wherein a first connection point is provided on the refrigerant pipeline between the indoor heat exchanger 300 and the outdoor heat exchanger 200, and the water tank refrigerant outlet 502 is connected to the first connection point.

[0062] The three-way valve 600 includes a fifth end 601 , a sixth end 602 and a seventh end 603 , wherein the fifth end 601 is connected to the exhaust port 101 , the sixth end 602 is connected to the intake port 102 , and the seventh end 603 is connected to the water tank refrigerant inlet 501 .

[0063] It should be noted that when the seventh end 603 and the sixth end 602 of the three-way valve 600 are connected, the first end 401 and the third end 403 of the four-way valve 400 are connected, and the second end 402 and the fourth end 404 are connected, the refrigerant flow direction in the combined heat pump system is: the exhaust port 101 of the compressor 100-the first end 401 of the four-way valve 400-the third end 403 of the four-way valve 400-the outdoor heat exchanger 200-the indoor heat exchanger 300-the fourth end 404 of the four-way valve 400-the second end 402 of the four-way valve 400-the air intake port 102 of the compressor 100, wherein, when the refrigerant flows out from the outdoor heat exchanger 200, part of the refrigerant will flow into the water tank refrigerant outlet 502 of the water tank heat exchanger 500 through the first connection point, and then flow out from the water tank refrigerant inlet 501, and enter the air intake port 102 of the compressor 100 through the three-way valve 600. After being compressed by the compressor 100, the high-temperature and high-pressure refrigerant passes through the four-way valve 400 to the outdoor heat exchanger 200, and is liquefied and releases heat in the outdoor heat exchanger 200. The refrigerant after liquefaction and heat release is divided into two paths, one of which enters the water tank heat exchanger 500 through the water tank refrigerant outlet 502, and the other enters the indoor heat exchanger 300 to vaporize and absorb heat, thereby taking away the heat of the surrounding environment of the indoor heat exchanger 300. Therefore, this refrigerant operation mode can be understood as the combined heat pump system operating in an independent cooling mode.

[0064] It should be noted that when the seventh end 603 and the sixth end 602 of the three-way valve 600 are connected, the first end 401 and the fourth end 404 of the four-way valve 400 are connected, and the second end 402 and the third end 403 are connected, the refrigerant flow direction in the combined heat pump system is: the exhaust port 101 of the compressor 100-the first end 401 of the four-way valve 400-the fourth end 404 of the four-way valve 400-the indoor heat exchanger 300-the outdoor heat exchanger 200-the third end 403 of the four-way valve 400-the second end 402 of the four-way valve 400-the air intake port 102 of the compressor 100, wherein, when the refrigerant flows out from the indoor heat exchanger 300, part of the refrigerant will flow into the water tank refrigerant outlet 502 of the water tank heat exchanger 500 through the first connection point, and then flow out from the water tank refrigerant inlet 501, and enter the air intake port 102 of the compressor 100 through the three-way valve 600. The high-temperature and high-pressure refrigerant compressed by the compressor 100 goes to the indoor heat exchanger 300 through the four-way valve 400, and is liquefied and releases heat through the indoor heat exchanger 300 to increase the air temperature. This refrigerant operation method in which the indoor heat exchanger 300 releases heat can be understood as an independent heating mode of the combined heat pump operation.

[0065] It should be noted that when the fifth end 601 and the seventh end 603 of the three-way valve 600 are connected, the first end 401 and the fourth end 404 of the four-way valve 400 are connected, and the second end 402 and the third end 403 are connected, the refrigerant flow direction in the combined heat pump system is: the exhaust port 101 of the compressor 100-the fifth end 601 of the three-way valve 600-the seventh end 603 of the three-way valve 600-the water tank refrigerant inlet 501-the water tank refrigerant outlet 502-the outdoor heat exchanger 200-the third end 403 of the four-way valve 400-the second end 402 of the four-way valve 400-the air intake port 102 of the compressor 100, wherein, when the refrigerant flows out from the exhaust port 101 of the compressor 100, part of the refrigerant will enter the indoor heat exchanger 300 through the four-way valve 400, and then flow from the indoor heat exchanger 300 to the outdoor heat exchanger 200. Therefore, it can be considered that there are two refrigerant operation modes, one of which is a refrigerant circuit consisting of compressor 100-three-way valve 600-water tank heat exchanger 500-outdoor heat exchanger 200-four-way valve 400-compressor 100, and the other refrigerant circuit consists of compressor 100-four-way valve 400-indoor heat exchanger 300-outdoor heat exchanger 200-four-way valve 400-compressor 100, so it can be understood that the combined heat pump system prepares hot water and increases the air temperature at the same time, that is, a collaborative heating mode; at the same time, if the fan on one side of the indoor heat exchanger 300 stops working, it can be considered that the combined heat pump system stops increasing the air temperature, and the combined heat pump system operates in an independent hot water mode.

[0066] It should be noted that when the fifth end 601 of the three-way valve 600 is connected to the seventh end 603, and the first end 401 of the four-way valve 400 is connected to the third end 403, the refrigerant output from the exhaust port 101 of the compressor 100 flows into the outdoor heat exchanger 200 through the four-way valve 400 and flows into the water tank heat exchanger 500 through the three-way valve 600, respectively, and the refrigerant flowing out of the water tank heat exchanger 500 will be mixed with the refrigerant flowing out of the outdoor heat exchanger 200 at the first connection point, and then enter the indoor heat exchanger 300. The refrigerant operation method in which the high-temperature and high-pressure refrigerant compressed by the compressor 100 enters the water tank heat exchanger 500 and the outdoor heat exchanger 200 at the same time to release heat, and then enters the indoor heat exchanger 300 can be understood as the combined heat pump system operation coordinated cooling mode, that is, air conditioning cooling and hot water preparation are carried out simultaneously.

[0067] It should be noted that when the fifth end 601 of the three-way valve 600 is connected to the seventh end 603, and the first end 401 of the four-way valve 400 is connected to the third end 403, the refrigerant output from the exhaust port 101 of the compressor 100 flows into the outdoor heat exchanger 200 through the four-way valve 400 and flows into the water tank heat exchanger 500 through the three-way valve 600, respectively, and the refrigerant flowing out of the water tank heat exchanger 500 will be mixed with the refrigerant flowing out of the outdoor heat exchanger 200 at the first connection point, and then enter the indoor heat exchanger 300. By transporting the high-temperature and high-pressure refrigerant to the outdoor heat exchanger 200, the refrigerant is liquefied and releases heat in the outdoor heat exchanger 200, and the heat generated by the heat release will melt the frost attached to the outdoor heat exchanger 200, thereby achieving the defrosting effect. This refrigerant operation method can be understood as the defrosting mode of the combined heat pump system.

[0068] It is understandable that the combined heat pump system may further include a gas-liquid separator 900, the gas-liquid separator 900 includes a refrigerant inlet and a refrigerant outlet, wherein the refrigerant inlet is connected to the sixth end 602 of the three-way valve 600 and the second end 402 of the four-way valve 400, respectively, and the refrigerant outlet is connected to the air intake 102 of the compressor 100. Since the liquid refrigerant evaporates in the evaporator, considering the change in load, in the process of the liquid refrigerant becoming gas, a part of the refrigerant may not be completely evaporated and directly enter the compressor 100. Due to the incompressibility of the liquid refrigerant, the liquid refrigerant directly entering the compressor 100 will cause liquid hammer phenomenon and damage the compressor 100, so before the refrigerant enters the compressor 100, the gas and liquid must first be separated from each other to prevent the low-pressure and low-temperature steam returning to the compressor 100 from carrying too much liquid refrigerant into the compressor 100 cylinder, and ensure that all the refrigerant entering the compressor 100 is gas, so as to ensure that the compressor 100 can operate normally.

[0069] Reference Figure 2 In the combined heat pump system provided in the embodiment of the present invention, a first control valve 510 is provided between the first connection point and the refrigerant outlet 502 of the water tank.

[0070] It should be noted that by setting the first control valve 510 between the first connection point and the water tank refrigerant outlet 502, the refrigerant flowing into the water tank refrigerant outlet 502 or flowing out of the water tank refrigerant outlet 502 can be adjusted. For example, the first control valve 510 is an expansion valve. When the combined heat pump system operates in the cooling mode, the refrigerant can be intercepted by the first control valve 510, so that the refrigerant can only flow from the outdoor heat exchanger 200 to the indoor heat exchanger 300, increasing the flow of the refrigerant, thereby improving the cooling effect of the air conditioner; similarly, when the combined heat pump system operates in the heating mode, the refrigerant can be intercepted by the first control valve 510, so that the refrigerant can only flow from the indoor heat exchanger 300 to the outdoor heat exchanger 200, increasing the flow of the refrigerant, thereby improving the heating effect of the air conditioner. In addition, by setting an expansion valve, part of the liquid refrigerant flowing out of the water tank heat exchanger 500 can be throttled and reduced in pressure, so that the condensation point of the refrigerant under the corresponding pressure state is reduced, and part of the liquid refrigerant is vaporized in the refrigerant pipeline, and the flow rate of the refrigerant can also be adjusted.

[0071] Reference Figure 2 In the combined heat pump system provided in the embodiment of the present invention, a second control valve 310 is provided between the first connection point and the indoor heat exchanger 300 , and a third control valve 210 is provided between the first connection point and the outdoor heat exchanger 200 .

[0072] It should be noted that by setting a second control valve 310 between the first connection point and the indoor heat exchanger 300, the refrigerant flow rate flowing into the indoor heat exchanger 300 or flowing out of the indoor heat exchanger 300 can be adjusted, and part of the liquid refrigerant flowing into the indoor heat exchanger 300 can be throttled and reduced in pressure, so that the condensation point of the refrigerant under the corresponding pressure state is reduced, thereby achieving vaporization of part of the liquid refrigerant. In addition, when the combined heat pump system operates in an independent hot water mode, the second control valve 310 can be adjusted to a preset opening, so that part of the refrigerant flows into the indoor heat exchanger 300, thereby reducing the refrigerant flow rate flowing into the water tank heat exchanger 500, thereby avoiding the increase in pressure on the water tank heat exchanger 500 due to more refrigerant flowing into the water tank heat exchanger 500, thereby affecting the service life of the water tank heat exchanger 500.

[0073] It is understandable that after the low-temperature and low-pressure refrigerant enters the indoor heat exchanger 300, it may condense in the indoor heat exchanger 300, causing the indoor ambient temperature to drop. Therefore, when the combined heat pump system operates in the defrost mode, the second control valve 310 can be closed to prevent the refrigerant after the outdoor heat exchanger 200 releases heat from flowing into the indoor heat exchanger 300 and affecting the indoor ambient temperature.

[0074] By setting a third control valve 210 between the first connection point and the indoor heat exchanger 300, the flow rate of refrigerant flowing into or out of the outdoor heat exchanger 200 can be adjusted, and part of the liquid refrigerant flowing into the outdoor heat exchanger 200 can be throttled and reduced in pressure, so that the condensation point of the refrigerant under the corresponding pressure state is reduced, thereby achieving vaporization of part of the liquid refrigerant.

[0075] Reference Figure 2 In the combined heat pump system provided in an embodiment of the present invention, the compressor 100 also includes an enthalpy spray port 103, and the combined heat pump system also includes a first flash evaporator 700, the first flash evaporator 700 includes a first flash refrigerant inlet 701, a first flash refrigerant outlet 702 and a second flash refrigerant outlet 703, wherein the first flash refrigerant inlet 701 is connected to the indoor heat exchanger 300, the first flash refrigerant outlet 702 is connected to the enthalpy spray port 103, and the second flash refrigerant outlet 703 is connected to the outdoor heat exchanger 200.

[0076] It should be noted that by setting the first flash evaporator 700, when the combined heat pump system operates in the heating mode under low temperature environment, the refrigerant flows out from the indoor heat exchanger 300, enters the first flash evaporator 700 through the first flash refrigerant inlet 701, and uses the first flash evaporator 700 to separate the refrigerant into gas and liquid. The gaseous refrigerant enters the spray enthalpy port 103 of the compressor 100 through the first flash refrigerant outlet 702, and the liquid refrigerant enters the outdoor heat exchanger 200 through the second flash refrigerant outlet 703, thereby realizing the secondary compression of the refrigerant, increasing the exhaust volume of the compressor 100, and achieving the purpose of improving the heating capacity under low temperature environment. When the combined heat pump system operates in cooling mode under high temperature environment, the refrigerant flows out from the outdoor heat exchanger 200 and enters the first flash evaporator 700 through the second flash refrigerant outlet 703. The first flash evaporator 700 is used to separate the refrigerant into gas and liquid. The gaseous refrigerant enters the spray enthalpy port 103 of the compressor 100 through the first flash refrigerant outlet 702, and the liquid refrigerant enters the indoor heat exchanger 300 through the first flash refrigerant inlet 701.

[0077] The refrigerant is separated into gas and liquid by the first flash evaporator 700, and then the gaseous refrigerant is transported to the injection port 103 of the compressor 100, and the compressor 100 is injected to increase the enthalpy. It can be understood that the exhaust temperature of the compressor 100 can be effectively reduced by injecting the enthalpy to increase the enthalpy of the compressor 100, and the exhaust temperature can be prevented from overheating. Because the pressure of the compressor 100 is relatively large during the operation of the system, the temperature of the discharged gas will be relatively high. By injecting the enthalpy to increase the enthalpy of the compressor 100, the internal temperature of the compressor 100 can be effectively reduced, thereby ensuring the stable operation of the system.

[0078] It can be understood that a first solenoid valve 800 is also arranged between the first flash refrigerant outlet 702 of the first flash evaporator 700 and the enthalpy spray port 103 of the compressor 100. The first solenoid valve 800 can control the flow rate of the gaseous refrigerant delivered to the enthalpy spray port 103. In addition, the first solenoid valve 800 can also control the cut-off state and the conduction state of the delivery channel between the first flash refrigerant outlet 702 and the enthalpy spray port 103.

[0079] Reference Figure 3 The combined heat pump system also includes a second flash evaporator 710, which includes a second flash refrigerant inlet 711, a third flash refrigerant outlet 712 and a fourth flash refrigerant outlet 713, wherein the second flash refrigerant inlet 711 is connected to the indoor heat exchanger 300, the third flash refrigerant outlet 712 is connected to the fourth end 404 of the four-way valve 400, and the fourth flash refrigerant outlet 713 is connected to the first connection end.

[0080] Reference Figure 3 The combined heat pump system also includes an ejector 320, which includes an ejection outlet 331, a first ejection inlet 332 and a second ejection inlet 333, wherein the ejection outlet 331 is connected to the indoor heat exchanger 300, the first ejection inlet 332 is connected to the outdoor heat exchanger 200, and the second ejection inlet 333 is connected to the fourth flash refrigerant outlet 713.

[0081] It should be noted that when the combined heat pump system operates in the cooling mode, after the refrigerant enters the second flash evaporator 710 from the second flash refrigerant inlet 711, the second flash evaporator 710 separates the refrigerant into gas and liquid, and the liquid refrigerant is transported to the second injection inlet 333 of the ejector 320 through the fourth flash refrigerant outlet 713, and the gaseous refrigerant is transported to the fourth end 404 of the four-way valve 400 through the third flash refrigerant outlet 712. Among them, after the liquid refrigerant enters the ejector 320 from the second injection inlet, it will meet the refrigerant entering from the first injection inlet 332, and the two refrigerants with different pressures will mix in the ejector 320 to form a mixed refrigerant, which will then be ejected from the injection outlet 331 and enter the indoor heat exchanger 300. By mixing the two refrigerants with different pressures in the ejector 320, the two refrigerants exchange energy, increase the pressure of the refrigerant without consuming mechanical energy, and improve the air conditioning refrigeration capacity while improving energy efficiency.

[0082] It can be understood that a second solenoid valve 810 is also arranged between the fourth flash refrigerant outlet 713 of the second flash evaporator 710 and the second injection inlet 333 of the ejector 320. The second solenoid valve 810 can control the flow rate of the liquid refrigerant delivered to the second injection inlet 333. In addition, the second solenoid valve 810 can also control the conduction state of the delivery channel between the fourth flash refrigerant outlet 713 and the second injection inlet 333.

[0083] Reference Figure 3 The combined heat pump system also includes a regenerator 1000, which includes a first heat exchange branch and a second heat exchange branch, wherein the inlet of the first heat exchange branch is connected to the outdoor heat exchanger 200, the outlet of the first heat exchange branch is connected to one end of the indoor heat exchanger 300, the inlet of the second heat exchange branch is connected to the other end of the indoor heat exchanger 300, and the outlet of the second heat exchanger branch is connected to the fourth end 404.

[0084] It should be noted that when the refrigerant condensed through the outdoor heat exchanger 200 enters from the inlet of the first heat exchange branch, and the refrigerant evaporated through the indoor heat exchanger 300 enters from the inlet of the second heat exchange branch, in the regenerator 1000, the refrigerant in the first heat exchange branch will exchange heat with the refrigerant in the second heat exchange branch. The temperature of the refrigerant in the first heat exchange branch is lower, and the temperature of the refrigerant in the second heat exchange branch is higher, so that the temperature of the refrigerant entering the indoor heat exchanger 300 is lower, thereby improving the cooling capacity of the air conditioner. In addition, by increasing the temperature of the refrigerant in the second heat exchange branch, the liquid droplets entrained in the refrigerant can be vaporized to prevent liquid hammer in the compressor 100. Similarly, when the refrigerant condensed by the indoor heat exchanger 300 enters the first heat exchange branch, the high-temperature and high-pressure refrigerant discharged from the jet port of the compressor 100 enters the second heat exchange branch. The refrigerant in the first heat exchange branch will exchange heat with the refrigerant in the second heat exchange branch. The temperature of the refrigerant in the first heat exchange branch is lower, and the temperature of the refrigerant in the second heat exchange branch is higher, so that the temperature of the refrigerant entering the indoor heat exchanger 300 is higher, thereby improving the heating capacity of the air conditioner.

[0085] It can be understood that the first heat exchange branch of the regenerator 1000 can also be connected to the first injection inlet 332, and the inlet of the second heat exchange branch of the regenerator 1000 can also be connected to the third flash refrigerant outlet 712 of the second flash evaporator 710. When the combined heat pump system operates in an independent cooling mode, the refrigerant that has completed evaporation from the indoor heat exchanger 300 enters the second flash evaporator 710, and the second flash evaporator 710 separates the refrigerant into gas and liquid. The gaseous refrigerant enters the regenerator 1000 through the third flash refrigerant outlet 712 of the second flash evaporator 710, and the liquid refrigerant is transported to the second injection inlet 333 through the fourth flash outlet of the second flash evaporator 710.

[0086] Reference Figure 4 , Figure 4 is a flow chart of a control method for a combined heat pump system provided by an embodiment of the present invention. The control method for a combined heat pump system can be applied to Figure 1 , Figure 2 or Figure 3 The combined heat pump system shown in the figure, the control method includes but is not limited to the following steps:

[0087] Step S100, determining the operation mode of the combined heat pump system;

[0088] Step S200, according to the operation mode, respectively controlling the four-way valve and the three-way valve to adjust the flow direction of the refrigerant in the combined heat pump system.

[0089] According to the control method provided by the embodiment of the present invention, by determining the operation mode of the combined heat pump system, and then controlling the conduction state of the four-way valve 400 and the conduction state of the three-way valve 600 respectively according to the operation mode, the refrigerant flow direction in the combined heat pump system is changed, and then the combined heat pump system is adaptively adjusted to the refrigerant according to the operation mode, so that the combined heat pump system can be compatible with multiple operation modes and effectively improve energy utilization. For example, when the operation mode of the combined heat pump system is the heating mode, by changing the conduction state of the four-way valve 400, the high-temperature and high-pressure refrigerant flows into the indoor heat exchanger 300 for condensation and releases heat; when the operation mode of the combined heat pump system is the cooling mode, by changing the conduction state of the four-way valve 400, the high-temperature and high-pressure refrigerant flows into the outdoor heat exchanger 200 for condensation, and then the refrigerant flows from the outdoor heat exchanger 200 into the indoor heat exchanger 300. By changing the conduction state of the three-way valve 600, it is possible to change whether the high-temperature and high-pressure refrigerant compressed by the compressor 100 flows into the water tank heat exchanger 500. For example, when the operating mode of the combined heat pump system is the hot water mode, by changing the conduction state of the four-way valve 400 and the conduction state of the three-way valve 600, the high-temperature and high-pressure refrigerant compressed by the compressor 100 flows to the water tank heat exchanger 500 through the three-way valve 600, thereby heating the water in the water tank.

[0090] Reference Figure 5 , Figure 5 The specific flow chart of the combined heat pump system running in the defrost mode provided by the embodiment of the present invention includes but is not limited to the following steps:

[0091] Step S210, when the operation mode is the defrost mode, control the three-way valve to connect the seventh end 603 and the sixth end 602, control the second control valve to close, and control the four-way valve to connect the first end 401 and the third end 403 and the second end 402 and the fourth end 404.

[0092] It is understandable that after the air conditioner runs in heating mode for a long time, frost may appear on the outdoor heat exchanger 200. If the outdoor heat exchanger 200 cannot be defrosted in time, the heating effect may be reduced, affecting the service life of the air conditioner, and in severe cases, causing damage to the air conditioner. When the operation mode of the combined heat pump system is the defrost mode, the three-way valve 600 is controlled to connect the seventh end 603 and the sixth end 602, the first end 401 of the four-way valve 400 is connected to the third end 403 of the four-way valve 400, and the second end 402 of the four-way valve 400 is connected to the fourth end 404 of the four-way valve 400, so that the high-temperature and high-pressure refrigerant is transported from the exhaust port 101 of the compressor 100 to the first end 401 of the four-way valve 400, and then transported from the third end 403 of the four-way valve 400 to the outdoor heat exchanger 200. When the high-temperature and high-pressure refrigerant enters the outdoor heat exchanger 200, it will be liquefied and release heat in the outdoor heat exchanger 200, and the frost on the outdoor heat exchanger 200 will be melted by releasing heat, thereby achieving the defrosting effect.

[0093] It is understandable that the high-temperature and high-pressure refrigerant will become a low-temperature and low-pressure refrigerant after releasing heat in the outdoor heat exchanger 200, and the low-temperature and low-pressure refrigerant needs to be vaporized and heat exchanged after entering the indoor heat exchanger 300, resulting in a drop in the indoor ambient temperature. Therefore, when the combined heat pump system operates in the defrosting mode, the second control valve 310 can also be controlled to be closed, and the first control valve 510 and the third control valve 210 can be opened to prevent the low-temperature and low-pressure refrigerant from entering the indoor heat exchanger 300 for condensation. After the second control valve 310 is closed, the refrigerant flow direction of the combined heat pump system is: the exhaust port 101 of the compressor 100-the first end 401 of the four-way valve 400-the third end 403 of the four-way valve 400-the outdoor heat exchanger 200-the water tank heat exchanger 500-the seventh end 603 of the three-way valve 600-the sixth end 602 of the three-way valve 600-the air intake port 102 of the compressor 100.

[0094] It is understandable that in Figure 3 In the combined heat pump system shown, when the combined heat pump system operates in defrosting mode, the first control valve 510, the third control valve 210 and the second control valve 310 are all kept in an open state, so that the refrigerant after heat release through the outdoor heat exchanger 200 enters the water tank heat exchanger 500 and the indoor heat exchanger 300 respectively, and avoids too much refrigerant from entering the water tank heat exchanger 500 while reducing the refrigerant flowing into the indoor heat exchanger 300. Among them, when more refrigerant enters the water tank heat exchanger 500, the refrigerant pressure on the water tank heat exchanger 500 will increase, thereby affecting the service life of the water tank heat exchanger 500, and when more refrigerant enters the indoor unit, the indoor ambient temperature may be greatly affected.

[0095] Reference Figure 6 , Figure 6The specific flow chart of the combined heat pump system operating in the cooperative cooling mode provided by the embodiment of the present invention includes but is not limited to the following steps:

[0096] Step S220 , when the operation mode is the cooperative cooling mode, the three-way valve is controlled to connect the fifth end 601 with the seventh end 603 , and the four-way valve is controlled to connect the first end 401 with the third end 403 and the second end 402 with the fourth end 404 .

[0097] It can be understood that the combined heat pump system operates in a collaborative cooling mode by controlling the three-way valve 600 to connect the fifth end 601 and the seventh end 603, controlling the first end 401 of the four-way valve 400 to connect with the third end 403 and the second end 402 to connect with the fourth end 404, setting the first control valve 510, the second control valve 310 and the third control valve 210 to the open state, changing the flow direction of the refrigerant, and allowing the high-temperature and high-pressure refrigerant to be discharged from the exhaust port 101 of the compressor 100 and then divided into two paths. One path enters the fifth end 601 of the three-way valve 600, and the other path enters the first end 401 of the four-way valve 400. The refrigerant entering the three-way valve 600 is transported to the water tank refrigerant inlet 501 through the seventh end 603 of the three-way valve 600. After the high-temperature and high-pressure refrigerant enters the water tank heat exchanger 500, it will liquefy and release heat to heat the water in the water tank. The refrigerant after liquefaction and heat release is discharged from the water tank refrigerant outlet 502 and then transported to the indoor heat exchanger 300. The refrigerant transported to the first end 401 of the four-way valve 400 is transported to the indoor heat exchanger 300 after liquefaction and heat release in the outdoor heat exchanger 200. The refrigerant discharged from the water tank refrigerant outlet 502 is mixed with the refrigerant discharged from the outdoor heat exchanger 200 at the first connection point and then transported to the indoor heat exchanger 300 for vaporization. Then the gaseous refrigerant passes through the fourth end 404 of the four-way valve 400 and the second end 402 of the four-way valve 400 in sequence and enters the air intake port 102 of the compressor 100. By switching the conduction state of the four-way valve 400 and the conduction state of the three-way valve 600, the combined heat pump system can simultaneously complete air conditioning refrigeration and hot water preparation, thereby improving energy utilization.

[0098] It should be noted that the refrigerant discharged from the water tank refrigerant outlet 502 is mixed with the refrigerant discharged from the outdoor heat exchanger 200 at the first connection point, and then enters the first flash evaporator 700 from the second flash refrigerant outlet 703. The first flash evaporator 700 transports a part of the gaseous refrigerant to the spray enthalpy port 103 of the compressor 100 through the first flash refrigerant outlet 702, and transports the other part of the refrigerant to the indoor heat exchanger 300 through the first flash refrigerant inlet 701.

[0099] It is understandable that in Figure 3In the combined heat pump system shown, the combined heat pump system operates in a coordinated cooling mode, and the refrigerant condensed by the outdoor heat exchanger 200 and the refrigerant condensed by the water tank heat exchanger 500 will enter the first heat exchange branch of the regenerator 1000, and the refrigerant evaporated by the indoor heat exchanger 300 will enter the second heat exchange branch. In the regenerator 1000, the refrigerant in the first heat exchange branch will exchange heat with the refrigerant in the second heat exchange branch, so that the temperature of the refrigerant in the first heat exchange branch is lower, thereby improving the cooling efficiency of the air conditioner. In addition, the refrigerant evaporated by the indoor heat exchanger 300 will also enter the second flash evaporator 710, and the refrigerant is separated into gas and liquid by the second flash evaporator 710, and the gaseous refrigerant enters the second heat exchange branch, and the liquid refrigerant enters the ejector 320 and mixes with the refrigerant flowing out of the first heat exchange branch before entering the indoor heat exchanger 300, which can effectively improve the cooling efficiency of the air conditioner.

[0100] Reference Figure 7 , Figure 7 The specific flow chart of the combined heat pump system operating in the cooperative heating mode provided by the embodiment of the present invention includes but is not limited to the following steps:

[0101] Step S230 , when the operation mode is the cooperative heating mode, the three-way valve is controlled to connect the fifth end 601 with the seventh end 603 , and the four-way valve is controlled to connect the first end 401 with the fourth end 404 and the second end 402 with the third end 403 .

[0102] It can be understood that the combined heat pump system operates in a collaborative heating mode by controlling the three-way valve 600 to connect the fifth end 601 and the seventh end 603, controlling the first end 401 of the four-way valve 400 to connect with the fourth end 404 and the third end 403 to connect with the second end 402, setting the first control valve 510, the second control valve 310 and the third control valve 210 to an open state, changing the flow direction of the refrigerant, and allowing the high-temperature and high-pressure refrigerant to be discharged from the exhaust port 101 of the compressor 100 and then divided into two paths. One path enters the fifth end 601 of the three-way valve 600, and the other path enters the first end 401 of the four-way valve 400. The refrigerant entering the three-way valve 600 is transported to the water tank refrigerant inlet 501 through the seventh end 603 of the three-way valve 600. After the high-temperature and high-pressure refrigerant enters the water tank heat exchanger 500, it will be liquefied and release heat to heat the water in the water tank. The refrigerant after liquefaction and heat release is discharged from the water tank refrigerant outlet 502 and then transported to the outdoor heat exchanger 200. The refrigerant transported to the first end 401 of the four-way valve 400 is transported to the indoor heat exchanger 300 through the fourth end 404 of the four-way valve 400. The refrigerant is liquefied and releases heat in the indoor heat exchanger 300 to heat the indoor room. The refrigerant after liquefaction and heat release is transported to the outdoor heat exchanger 200. The refrigerant discharged from the water tank refrigerant outlet 502 is mixed with the refrigerant discharged from the indoor heat exchanger 300 at the first connection point and then transported to the outdoor heat exchanger 200 for vaporization. Then the gaseous refrigerant sequentially passes through the third end 403 and the second end 402 of the four-way valve 400 and enters the air intake port 102 of the compressor 100. By switching the conduction state of the four-way valve 400 and the conduction state of the three-way valve 600, the combined heat pump system can simultaneously complete air conditioning heating and hot water preparation, thereby improving energy utilization.

[0103] It should be noted that after the refrigerant discharged from the indoor heat exchanger 300 enters the first flash evaporator 700 through the first flash refrigerant inlet 701, the first flash evaporator 700 will transport a part of the gaseous refrigerant to the injection enthalpy port 103 of the compressor 100 through the first flash refrigerant outlet 702, and transport the other part of the refrigerant to the first connection point through the second flash refrigerant outlet 703.

[0104] It is understandable that in Figure 3 In the combined heat pump system shown, the refrigerant flowing out of the indoor heat exchanger 300 will enter the first heat exchange branch, and the refrigerant discharged from the compressor 100 will first enter the second heat exchange branch. In the regenerator 1000, the refrigerant in the first heat exchange branch will exchange heat with the refrigerant in the second heat exchange branch, so that the temperature of the refrigerant in the second heat exchange branch is higher, thereby improving the heating efficiency of the air conditioner.

[0105] Reference Figure 8 , Figure 8 The specific flow chart of the combined heat pump system provided in the embodiment of the present invention operating in the independent cooling mode includes but is not limited to the following steps:

[0106] Step S240, when the operation mode is the independent cooling mode, control the three-way valve to connect the sixth end 602 and the seventh end 603, control the four-way valve to connect the first end 401 and the third end 403 and the second end 402 and the fourth end 404, and control the first control valve to close.

[0107] It can be understood that when the combined heat pump system operates in independent cooling mode, the three-way valve 600 can be controlled to connect the sixth end 602 and the seventh end 603, the four-way valve 400 can be controlled to connect the first end 401 and the third end 403, and the four-way valve 400 can be controlled to connect the second end 402 and the fourth end 404. The high-temperature and high-pressure refrigerant is discharged from the exhaust port 101 of the compressor 100, enters the four-way valve 400 from the first end 401 of the four-way valve 400, and is transported to the outdoor heat exchanger 200 from the third end 403 of the four-way valve 400. The high-temperature and high-pressure refrigerant is condensed in the outdoor heat exchanger 200. The condensed refrigerant will be divided into two paths at the first connection point. One path enters the water tank heat exchanger 500, and then passes through the water tank refrigerant inlet 501, the seventh end 603 of the three-way valve 600 and the sixth end 602 of the three-way valve 600 in sequence and returns to the suction port 102 of the compressor 100; the other path enters the indoor heat exchanger 300 to vaporize and absorb heat, and the refrigerant changes from liquid to gas, and then the gaseous refrigerant passes through the fourth end 404 and the second end 402 of the four-way valve 400 and returns to the suction port 102 of the compressor 100.

[0108] It should be noted that the refrigerant discharged from the outdoor heat exchanger 200 enters the first flash evaporator 700 from the second flash refrigerant outlet 703. The first flash evaporator 700 transports a portion of the gaseous refrigerant to the injection enthalpy port 103 of the compressor 100 through the first flash refrigerant outlet 702, and transports the other portion of the refrigerant to the indoor heat exchanger 300 through the first flash refrigerant inlet 701.

[0109] In addition, when the combined heat pump system operates in an independent cooling mode, the first control valve 510 can be controlled to be closed, and the second control valve 310 and the third control valve 210 can be controlled to be opened, so that the refrigerant passes through the outdoor heat exchanger 200 and directly enters the indoor heat exchanger 300, thereby increasing the refrigerant flowing through the indoor heat exchanger 300, thereby improving the cooling capacity of the air conditioner.

[0110] It is understandable that in Figure 3In the combined heat pump system shown, the combined heat pump system operates in an independent cooling mode, and the refrigerant condensed by the outdoor heat exchanger 200 and the refrigerant condensed by the water tank heat exchanger 500 will enter the first heat exchange branch of the regenerator 1000, and the refrigerant evaporated by the indoor heat exchanger 300 will enter the second heat exchange branch. In the regenerator 1000, the refrigerant in the first heat exchange branch will exchange heat with the refrigerant in the second heat exchange branch, so that the temperature of the refrigerant in the first heat exchange branch is lower, thereby improving the cooling efficiency of the air conditioner. In addition, the refrigerant evaporated by the indoor heat exchanger 300 will also enter the second flash evaporator 710, and the refrigerant is separated into gas and liquid by the second flash evaporator, and the gaseous refrigerant enters the second heat exchange branch, and the liquid refrigerant enters the ejector 320 and mixes with the refrigerant flowing out of the first heat exchange branch before entering the indoor heat exchanger 300, which can effectively improve the cooling efficiency of the air conditioner.

[0111] Reference Fig. 9 , Fig. 9 The specific flow chart of the combined heat pump system provided in the embodiment of the present invention operating in the independent heating mode includes but is not limited to the following steps:

[0112] Step S250, when the operation mode is the independent heating mode, control the three-way valve to connect the sixth end 602 and the seventh end 603, control the four-way valve to connect the first end 401 and the fourth end 404 and the second end 402 and the third end 403, and control the first control valve to close.

[0113] It can be understood that when the combined heat pump system operates in an independent heating mode, the three-way valve 600 is controlled to connect the sixth end 602 and the seventh end 603, the four-way valve 400 is controlled to connect the first end 401 and the fourth end 404, and the four-way valve 400 is controlled to connect the second end 402 and the third end 403. The high-temperature and high-pressure refrigerant is discharged from the exhaust port 101 of the compressor 100 and enters the four-way valve 400 from the first end 401 of the four-way valve 400, and then is transported to the indoor heat exchanger 300 through the fourth end 404 of the four-way valve 400. The high-temperature and high-pressure refrigerant condenses and releases heat in the indoor heat exchanger 300, so that the indoor ambient temperature rises, and the condensed refrigerant is divided into two paths at the first connection point. One path enters the water tank heat exchanger 500, and then passes through the water tank refrigerant inlet 501, the seventh end 603 of the three-way valve 600 and the sixth end 602 of the three-way valve 600 in sequence and returns to the air intake port 102 of the compressor 100; the other path enters the outdoor heat exchanger 200 to vaporize and absorb heat, and the refrigerant changes from liquid to gas, and then the gaseous refrigerant returns to the air intake port 102 of the compressor 100 through the third end 403 and the second end 402 of the four-way valve 400.

[0114] It should be noted that the refrigerant discharged from the indoor heat exchanger 300 enters the first flash evaporator 700 from the first flash refrigerant inlet 701, and the first flash evaporator 700 transports a part of the gaseous refrigerant to the spray enthalpy port 103 of the compressor 100 through the first flash refrigerant outlet 702, and transports the other part of the refrigerant to the outdoor heat exchanger 200 through the second flash refrigerant outlet 703.

[0115] In addition, when the combined heat pump system operates in an independent heating mode, the refrigerant can be prevented from entering the water tank heat exchanger 500 by controlling the first control valve 510 to close and the second control valve 310 and the third control valve 210 to open, thereby shortening the refrigerant circulation path and improving the heating efficiency of the air conditioner.

[0116] It is understandable that in Figure 3 In the combined heat pump system shown, the refrigerant flowing out of the indoor heat exchanger 300 will enter the first heat exchange branch, and the refrigerant discharged from the compressor 100 will first enter the second heat exchange branch. In the regenerator 1000, the refrigerant in the first heat exchange branch will exchange heat with the refrigerant in the second heat exchange branch, so that the temperature of the refrigerant in the second heat exchange branch is higher, thereby improving the heating efficiency of the air conditioner.

[0117] Reference Fig.10 , Fig.10 The specific flow chart of the combined heat pump system provided in the embodiment of the present invention running the independent hot water mode includes but is not limited to the following steps:

[0118] Step S260, when the operation mode is the independent hot water mode, the three-way valve is controlled to connect the fifth end 601 and the seventh end 603, the four-way valve is controlled to connect the first end 401 and the fourth end 404 and the second end 402 and the third end 403, and the opening of the third control valve is controlled so that the opening of the third control valve is less than the preset opening threshold.

[0119] It can be understood that the combined heat pump system operates in an independent hot water mode, by controlling the three-way valve 600 to connect the fifth end 601 and the seventh end 603, controlling the four-way valve 400 to connect the first end 401 and the fourth end 404, and controlling the four-way valve 400 to connect the second end 402 and the third end 403. The refrigerant discharged from the exhaust port 101 of the compressor 100 is divided into two paths, one of which passes through the three-way valve 600 and enters the water tank heat exchanger 500 from the water tank refrigerant inlet 501 to heat the water in the water tank, and the other passes through the four-way valve 400 to enter the indoor heat exchanger 300. Finally, the refrigerant flowing out of the water tank refrigerant outlet 502 and the refrigerant flowing out of the indoor heat exchanger 300 are mixed at the first connection point, and then enter the outdoor heat exchanger 200 for vaporization. The vaporized refrigerant returns to the air intake port 102 of the compressor 100 through the four-way valve 400.

[0120] When the combined heat pump system operates in the independent hot water mode, the first control valve 510 and the third control valve 210 are controlled to be in the open state, and then the opening of the second control valve 310 is adjusted. When the second control valve 310 is in the closed state, the refrigerant cannot enter the outdoor heat exchanger 200 through the indoor heat exchanger 300. At this time, the refrigerant can only enter the water tank heat exchanger 500 through the three-way valve 600. However, the water tank heat exchanger 500 may be subjected to the high-pressure refrigerant for a long time, which may cause the service life of the water tank heat exchanger 500 to decrease. By adjusting the opening of the second control valve 310, part of the refrigerant can flow into the indoor heat exchanger 300, thereby reducing the refrigerant pressure on the water tank heat exchanger 500 and increasing the service life of the water tank heat exchanger 500.

[0121] It should be noted that the reduction of the refrigerant flowing into the water tank heat exchanger 500 may cause the efficiency of hot water preparation to decrease. By controlling the opening of the second control valve 310 so that the opening of the second control valve 310 is less than the preset opening threshold, the influence of the refrigerant diversion on the efficiency of hot water preparation can be reduced. That is, when the opening of the second control valve 310 is greater than the preset opening threshold, the water tank heat exchanger 500 will reduce the efficiency of hot water preparation due to the reduction of the refrigerant flowing into it.

[0122] It is understandable that, in some embodiments, the refrigerant pipe in the water tank heat exchanger 500 is provided with a pressure sensor, and the refrigerant pressure in the refrigerant pipe is obtained through the pressure sensor. When the refrigerant pressure is greater than the maximum pressure bearing value of the water tank heat exchanger 500, the refrigerant flow in the water tank heat exchanger 500 can be reduced by increasing the opening of the second control valve 310, thereby reducing the refrigerant pressure and avoiding the water tank heat exchanger 500 from being damaged due to excessive refrigerant pressure. When the refrigerant pressure is less than the maximum pressure bearing value of the water tank heat exchanger 500, the refrigerant flow in the water tank heat exchanger 500 can be increased by reducing the opening of the second control valve 310, avoiding the water tank heat exchanger 500 from being insufficiently refrigerant The flow rate reduces the efficiency of hot water preparation.

[0123] In addition, when the second control valve 310 is opened, the refrigerant discharged from the indoor heat exchanger 300 enters the first flash evaporator 700 from the first flash refrigerant inlet 701, and the first flash evaporator 700 transports part of the gaseous refrigerant to the injection enthalpy port 103 of the compressor 100 through the first flash refrigerant outlet 701 to inject enthalpy to the compressor 100.

[0124] It is understandable that in Figure 3 In the combined heat pump system shown, the opening of the second control valve 310 can be adjusted to allow part of the refrigerant to flow into the indoor heat exchanger 300, thereby reducing the refrigerant pressure on the water tank heat exchanger 500 and increasing the service life of the water tank heat exchanger 500.

[0125] It can be understood that the combined heat pump system operates in an independent hot water mode, the seventh end 603 and the fifth end 601 of the three-way valve 600 are connected, and the refrigerant discharged from the compressor 100 enters the water tank heat exchanger 500 through the three-way valve 600 to heat the water in the water tank, the first end 401 and the fourth end 404 of the four-way valve 400 are connected, the second end 402 and the third end 403 of the four-way valve 400 are connected, the first control valve 510 and the third control valve 210 are in an open state, and the opening of the second control valve 310 is less than the preset opening threshold. By adjusting the second control valve 310 to less than the preset opening threshold, part of the refrigerant enters the indoor heat exchanger 300, thereby reducing the refrigerant pressure on the water tank heat exchanger 500 and increasing the service life of the water tank heat exchanger 500. The combined heat pump system operates in an independent cooling mode, the seventh end 603 and the sixth end 602 of the three-way valve 600 are connected, the first end 401 and the third end 403 of the four-way valve 400 are connected, the second end 402 and the fourth end 404 of the four-way valve 400 are connected, the first control valve 510 is closed, the second control valve 310 and the third control valve 210 are opened, and the high-temperature and high-pressure gaseous refrigerant discharged from the exhaust port 101 of the compressor 100 enters the outdoor heat exchanger 200 for condensation and heat release. The refrigerant after heat release changes from a gaseous state to a gas-liquid mixed state. The gas-liquid mixed refrigerant enters the first flash evaporation for gas-liquid separation. The gaseous refrigerant supplements gas and increases enthalpy to the injection enthalpy port 103 of the compressor 100 through the first flash evaporation outlet, and the liquid refrigerant enters the indoor heat exchanger 300 through the first flash evaporation inlet. The liquid refrigerant evaporates in the indoor heat exchanger 300 and absorbs heat around the indoor heat exchanger 300 to achieve air conditioning refrigeration. The combined heat pump system operates in an independent heating mode, the seventh end 603 and the sixth end 602 of the three-way valve 600 are connected, the first end 401 and the fourth end 404 of the four-way valve 400 are connected, the second end 402 and the third end 403 of the four-way valve 400 are connected, the first control valve 510 is closed, the second control valve 310 and the third control valve 210 are opened, and the high-temperature and high-pressure gaseous refrigerant discharged from the exhaust port 101 of the compressor 100 enters the indoor heat exchanger 300 for condensation and heat release, thereby realizing air conditioning heating and heat release. The heated refrigerant changes from a gaseous state to a gas-liquid mixed state, and the gas-liquid mixed refrigerant enters the first flash evaporator 700 for gas-liquid separation. The gaseous refrigerant replenishes air and increases enthalpy at the injection enthalpy port 103 of the compressor 100 through the first flash refrigerant outlet 702. The liquid refrigerant enters the outdoor heat exchanger 200 through the second flash refrigerant outlet 703. The liquid refrigerant evaporates in the outdoor heat exchanger 200 and absorbs heat around the outdoor heat exchanger 200, and finally returns to the air intake port 102 of the compressor 100 through the four-way valve 400.The combined heat pump system operates in defrost mode, the seventh end 603 and the sixth end 602 of the three-way valve 600 are connected, the first end 401 and the third end 403 of the four-way valve 400 are connected, the second end 402 and the fourth end 404 of the four-way valve 400 are connected, the second control valve 310 is closed, the first control valve 510 and the third control valve 210 are opened, and the refrigerant discharged from the compressor 100 enters the outdoor heat exchanger 200 to liquefy and release heat to remove frost attached to the outdoor heat exchanger 200. By closing the second control valve 310, the refrigerant flowing out of the outdoor heat exchanger 200 can only enter the water tank heat exchanger 500, thereby preventing the refrigerant from entering the indoor heat exchanger 300 and affecting the indoor ambient temperature. The combined heat pump system operates in the cooperative heating mode, the seventh end 603 and the fifth end 601 of the three-way valve 600 are connected, the first end 401 and the fourth end 404 of the four-way valve 400 are connected, the second end 402 and the third end 403 of the four-way valve 400 are connected, the first control valve 510, the second control valve 310 and the third control valve 210 are all in the open state, and the high-temperature and high-pressure gaseous refrigerant discharged from the exhaust port 101 of the compressor 100 enters the indoor heat exchanger 300 and the water tank heat exchanger 500 respectively. Condensation and heat release are carried out in the refrigerant, and the refrigerant after heat release changes from a gaseous state to a gas-liquid mixed state. The refrigerant flowing out of the water tank heat exchanger 500 directly enters the outdoor heat exchanger 200, and the refrigerant flowing out of the indoor heat exchanger 300 will enter the first flash evaporator 700 for gas-liquid separation. The gaseous refrigerant replenishes air and increases enthalpy at the injection enthalpy port 103 of the compressor 100 through the first flash refrigerant outlet 702, and the liquid refrigerant enters the outdoor heat exchanger 200 through the second flash refrigerant outlet 703, thereby realizing air conditioning heating and hot water preparation. The combined heat pump system operates in a coordinated cooling mode, the seventh end 603 and the fifth end 601 of the three-way valve 600 are connected, the first end 401 and the third end 403 of the four-way valve 400 are connected, the second end 402 and the fourth end 404 of the four-way valve 400 are connected, the first control valve 510, the second control valve 310 and the third control valve 210 are all in an open state, and the high-temperature and high-pressure gaseous refrigerant discharged from the exhaust port 101 of the compressor 100 enters the outdoor heat exchanger 200 and the water tank heat exchanger respectively. Condensation and heat release are carried out in 500, and the refrigerant after heat release changes from a gaseous state to a gas-liquid mixed state. The gas-liquid mixed refrigerant enters the first flash evaporator 700 for gas-liquid separation. The gaseous refrigerant replenishes air and increases enthalpy to the injection enthalpy port 103 of the compressor 100 through the first flash refrigerant outlet 702, and the liquid refrigerant enters the indoor heat exchanger 300 through the first flash refrigerant inlet 701. The liquid refrigerant evaporates in the indoor heat exchanger 300 and absorbs heat around the indoor heat exchanger 300, thereby realizing air conditioning and hot water preparation.

[0126] Thirdly, refer to Fig.11The embodiment of the present invention provides an operation control device 1100, including a memory 1110, a processor 1120, and a computer program stored in the memory 1110 and executable on the processor 1120. The processor 1120 executes the program to implement the control method of the combined heat pump system of the second embodiment of the above, for example, executing Figure 4 Method steps S100 to S200, Figure 5 In the method step S210, Figure 6 Step S220 of the method, Figure 7 In the method step S230, Figure 8 Step S240 of the method, Fig. 9 Method step S250 and Fig.10 Method step S260 in .

[0127] The memory 1110 is a non-transient computer-readable storage medium that can be used to store non-transient software programs and non-transient computer executable programs, such as the control method of the combined heat pump system in the above embodiment of the present invention. The processor 1120 implements the control method of the combined heat pump system in the above embodiment of the present invention by running the non-transient software programs and instructions stored in the memory 1110.

[0128] The memory 1110 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and application programs required for at least one function; the data storage area may store data required to execute the control method of the combined heat pump system in the above embodiment, etc. In addition, the memory 1110 may include a high-speed random access memory 1110, and may also include a non-transitory memory 1110, such as at least one disk storage device, a flash memory device, or other non-transitory solid-state storage device. It should be noted that the memory 1110 may optionally include a memory 1110 remotely arranged relative to the processor 1120, and these remote memories 1110 may be connected to the terminal via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0129] In a fourth aspect, an embodiment of the present invention provides a combined heat pump system of an air conditioner and a heat pump water heater, the combined heat pump system of an air conditioner and a heat pump water heater comprises an operation control device 1100 as in the embodiment of the third aspect, since the water tank heat exchanger 500 is connected in parallel with the outdoor heat exchanger 200, the three-way valve 600 can be used to adjust the refrigerant flow direction of the water tank heat exchanger 500, and the four-way valve 400 can be used to adjust the refrigerant flow direction of both the outdoor heat exchanger 200 and the indoor heat exchanger 300, compared with the combined refrigerant system in the related art due to the fixed refrigerant circuit Due to limitations, it is impossible to simultaneously meet the requirements of air conditioning and hot water preparation. After determining the operating mode of the combined heat pump system, the embodiment of the present invention can realize a variety of different refrigerant circuits by switching the connectivity between the three-way valve 600 and the four-way valve 400, and adjust the flow direction of the refrigerant in the outdoor heat exchanger 200, the indoor heat exchanger 300 and the water tank heat exchanger 500, thereby changing the heat exchange sequence of the refrigerant in each heat exchanger, realizing a variety of operating modes of the combined heat pump system, being compatible with the functional requirements of air conditioning and hot water preparation, and improving energy utilization.

[0130] In a fifth aspect, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the control method of the second aspect embodiment above, for example, to execute Figure 4 Method steps S100 to S200, Figure 5 In the method step S210, Figure 6 Step S220 of the method, Figure 7 In the method step S230, Figure 8 Step S240 of the method, Fig. 9 Method step S250 and Fig.10 Method step S260 in .

[0131] It will be appreciated by those skilled in the art that all or some of the steps and systems in the method disclosed above may be implemented as software, firmware, hardware and appropriate combinations thereof. Some physical components or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or may be implemented as hardware, or may be implemented as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium or a non-transitory medium and a communication medium or a temporary medium. As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information such as computer-readable instructions, data structures, program modules or other data. Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disk DVD or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that may be used to store desired information and may be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0132] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A combined heat pump system of an air conditioner and a heat pump water heater, characterized in that: include: A compressor, including a suction port and a discharge port; Outdoor heat exchanger; An indoor heat exchanger connected to the outdoor heat exchanger; A four-way valve, comprising a first end connected to the exhaust port, a second end connected to the air intake port, a third end connected to the outdoor heat exchanger, and a fourth end connected to the indoor heat exchanger; A water tank heat exchanger, comprising a water tank refrigerant inlet and a water tank refrigerant outlet, wherein the water tank refrigerant outlet is connected to a first connection point, and the first connection point is located in a refrigerant pipeline between the indoor heat exchanger and the outdoor heat exchanger; The three-way valve includes a fifth end connected to the exhaust port, a sixth end connected to the intake port, and a seventh end connected to the refrigerant inlet of the water tank.

2. The combined heat pump system according to claim 1, characterized in that: A first control valve is provided between the first connection point and the water tank refrigerant outlet.

3. The combined heat pump system according to claim 2, characterized in that: A second control valve is provided between the first connection point and the indoor heat exchanger, and a third control valve is provided between the first connection point and the outdoor heat exchanger.

4. The heat pump system according to any one of claims 1 to 3, characterized in that: The compressor also includes an enthalpy spray port, and the combined heat pump system also includes a first flash evaporator, the first flash evaporator including a first flash refrigerant inlet connected to the indoor heat exchanger, a first flash refrigerant outlet connected to the enthalpy spray port, and a second flash refrigerant outlet connected to the outdoor heat exchanger.

5. The combined heat pump system according to any one of claims 1 to 3, characterized in that: The combined heat pump system also includes a second flash evaporator, which includes a second flash refrigerant inlet connected to the indoor heat exchanger, a third flash refrigerant outlet connected to the fourth end, and a fourth flash refrigerant outlet connected to the first connection point.

6. The combined heat pump system according to claim 5, characterized in that: The combined heat pump system further includes an ejector, which includes an ejection outlet connected to the indoor heat exchanger, a first ejection inlet connected to the outdoor heat exchanger, and a second ejection inlet connected to the fourth flash refrigerant outlet.

7. The combined heat pump system according to any one of claims 1 to 3, characterized in that: The combined heat pump system also includes a regenerator, which includes a first heat exchange branch and a second heat exchange branch, the inlet of the first heat exchange branch is connected to the outdoor heat exchanger, the outlet of the first heat exchange branch and the inlet of the second heat exchange branch are respectively connected to the two ends of the indoor heat exchanger, and the outlet of the second heat exchange branch is connected to the fourth end.

8. A control method for a combined heat pump system of an air conditioner and a heat pump water heater, characterized in that: Applicable to the combined heat pump system of an air conditioner and a heat pump water heater according to any one of claims 1 to 7, the control method comprises: determining an operating mode of the combined heat pump system; According to the operation mode, the four-way valve and the three-way valve are controlled respectively to adjust the flow direction of the refrigerant in the combined heat pump system.

9. The control method according to claim 8, characterized in that: A second control valve is provided between the first connection point and the indoor heat exchanger; the operation mode includes a defrost mode; and the four-way valve and the three-way valve are controlled respectively according to the operation mode, including: When the operation mode is the defrost mode, the three-way valve is controlled to connect the seventh end with the sixth end, the second control valve is controlled to be closed, and the four-way valve is controlled to connect the first end with the third end and the second end with the fourth end.

10. The control method according to claim 8, characterized in that: The operation mode includes a cooperative cooling mode and a cooperative heating mode; and the four-way valve and the three-way valve are controlled respectively according to the operation mode, including: When the operation mode is the cooperative cooling mode, the three-way valve is controlled to connect the fifth end with the seventh end, and the four-way valve is controlled to connect the first end with the third end and the second end with the fourth end; or, When the operation mode is the cooperative heating mode, the three-way valve is controlled to connect the fifth end with the seventh end, and the four-way valve is controlled to connect the first end with the fourth end and the second end with the third end.

11. The control method according to claim 8, characterized in that: A first control valve is provided between the first connection point and the refrigerant outlet of the water tank; the operation mode includes an independent cooling mode and an independent heating mode; and the four-way valve and the three-way valve are controlled respectively according to the operation mode, including: When the operation mode is the independent cooling mode, the three-way valve is controlled to connect the sixth end with the seventh end, the four-way valve is controlled to connect the first end with the third end and the second end with the fourth end, and the first control valve is controlled to be closed; or, When the operation mode is the independent heating mode, the three-way valve is controlled to connect the sixth end and the seventh end, the four-way valve is controlled to connect the first end and the fourth end and the second end and the third end, and the first control valve is controlled to be closed.

12. The control method according to claim 8, characterized in that: A second control valve is provided between the first connection point and the indoor heat exchanger; the operation mode includes an independent hot water mode; and the four-way valve and the three-way valve are controlled respectively according to the operation mode, including: When the operation mode is the independent hot water mode, the three-way valve is controlled to connect the fifth end and the seventh end, the four-way valve is controlled to connect the first end and the fourth end and the second end and the third end, and the opening of the second control valve is controlled so that the opening of the second control valve is less than a preset opening threshold.

13. An operation control device, characterized in that: The method comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the control method of the combined heat pump system of the air conditioner and the heat pump water heater as claimed in claims 8 to 12.

14. A combined heat pump system of an air conditioner and a heat pump water heater, characterized in that: Includes the operation control device as described in claim 13.

15. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the control method of the combined heat pump system of an air conditioner and a heat pump water heater as described in claims 8 to 12.

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