Combined heat pump system of air conditioner and heat pump water heater, control method, and control device

Abstract

Disclosed in the present application are 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 (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). The compressor (100) comprises an air suction port (102) and an air discharge port (101), and the indoor heat exchanger (300) is connected to the outdoor heat exchanger (200); the four-way valve (400) comprises a first end (401) connected to the air discharge port (101), a second end (402) connected to the air suction port (102), a third end (403) connected to the outdoor heat exchanger (200), and a fourth end (404) connected to the indoor heat exchanger (300); the water tank heat exchanger (500) comprises a water tank refrigerant inlet (501) and a water tank refrigerant outlet (502), the water tank refrigerant outlet (502) being connected to a first connection point, and the first connection point being located on a refrigerant pipeline between the indoor heat exchanger (300) and the outdoor heat exchanger (200); and the three-way valve (600) comprises a fifth end (601) connected to the air discharge port (101), a sixth end (602) connected to the air suction port (102), and a seventh end (603) connected to the water tank refrigerant inlet (501).

Description

Combined heat pump system, control method and control device of air conditioner and heat pump water heater

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202311279359.2 filed on September 28, 2023, entitled “Combined heat pump system, control method and control device of air conditioner and heat pump water heater”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application 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

[0004] Currently, air conditioners and water heaters are typically separate systems. Installing both simultaneously takes up a lot of space, is cumbersome to install, and results in low energy efficiency. Therefore, conventional air conditioning systems employ a water-cooled outdoor heat exchanger. This allows the outdoor heat exchanger to simultaneously heat water when the air conditioner is operating in cooling mode, improving thermal energy efficiency. However, this limits the use of hot water preparation and heating, making it impossible to simultaneously meet the needs of air conditioning and hot water preparation. Therefore, achieving a heat pump system that is compatible with both air conditioning and hot water preparation has become a pressing issue.

[0005] Summary of the Invention

[0006] The purpose of the present application is to at least partially solve one of the technical problems existing in the prior art and to provide a combined heat pump system of an air conditioner and a heat pump water heater, a control method and a control device.

[0007] In a first aspect, an embodiment of the present application provides a combined heat pump system of an air conditioner and a heat pump water heater, comprising:

[0008] A compressor, including an air intake and an air discharge port;

[0009] outdoor heat exchanger;

[0010] an indoor heat exchanger connected to the outdoor heat exchanger;

[0011] a four-way valve comprising a first end connected to the exhaust port, a second end connected to the intake port, a third end connected to the outdoor heat exchanger, and a fourth end connected to the indoor heat exchanger;

[0012] 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 located in a refrigerant pipeline between the indoor heat exchanger and the outdoor heat exchanger;

[0013] 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.

[0014] According to the combined heat pump system provided in some embodiments of the present application, a first control valve is provided between the first connection point and the refrigerant outlet of the water tank.

[0015] According to the combined heat pump system provided in some embodiments of the present application, 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.

[0016] According to the combined heat pump system provided in some embodiments of the present application, 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.

[0017] According to some embodiments of the present application, the combined heat pump system further 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.

[0018] According to some embodiments of the present application, 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.

[0019] According to some embodiments of the present application, 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 the two ends of the indoor heat exchanger, and the outlet of the second heat exchange branch is connected to the fourth end.

[0020] In a second aspect, an embodiment of the present application 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:

[0021] determining an operating mode of the combined heat pump system;

[0022] 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.

[0023] According to the control method provided in some embodiments of the present application, when the operating mode is the defrost mode, the three-way valve is controlled to connect the seventh end and the sixth end, the second control valve is controlled to be closed, and the four-way valve is controlled to connect the first end and the third end and the second end and the fourth end.

[0024] According to the control method provided in some embodiments of the present application, when the operating mode is the collaborative cooling mode, the three-way valve is controlled to connect the fifth end and the seventh end, and the four-way valve is controlled to connect the first end and the third end and the second end and the fourth end;

[0025] or,

[0026] When the operation mode is the cooperative heating mode, the three-way valve is controlled to connect the fifth end and the seventh end, and the four-way valve is controlled to connect the first end and the fourth end and the second end and the third end.

[0027] According to the control method provided in some embodiments of the present application, when the operating mode is the independent cooling 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 third end and the second end and the fourth end, and the first control valve is controlled to be closed;

[0028] or,

[0029] 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.

[0030] According to the control method provided in some embodiments of the present application, when the operating mode is an 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 third control valve is controlled so that the opening of the third control valve is less than a preset opening threshold.

[0031] In the third aspect, an embodiment of the present application provides an operation control device, comprising a memory, a processor, and a computer program stored on 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 described in the embodiment of the second aspect above.

[0032] In a fourth aspect, an embodiment of the present application 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] In a fifth aspect, an embodiment of the present application 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 described in the embodiment of the first aspect above.

[0034] Other features and advantages of the present application will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present application. The purposes and other advantages of the present application can be achieved and obtained through the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings are used to provide a further understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0036] The present application is further described below with reference to the accompanying drawings and embodiments;

[0037] FIG1 is a schematic structural diagram of a combined heat pump system provided in an embodiment of the present application;

[0038] FIG2 is a schematic structural diagram of a combined heat pump system provided by another embodiment of the present application;

[0039] FIG3 is a structural diagram of a combined heat pump system provided by another embodiment of the present application;

[0040] FIG4 is a flow chart of a control method for a combined heat pump system provided in an embodiment of the present application;

[0041] FIG5 is a specific flow chart of the combined heat pump system operating in defrost mode according to an embodiment of the present application;

[0042] FIG6 is a specific flow chart of the combined heat pump system operating in the collaborative cooling mode according to an embodiment of the present application;

[0043] FIG7 is a specific flow chart of the combined heat pump system operating in the collaborative heating mode provided by an embodiment of the present application;

[0044] FIG8 is a specific flow chart of the combined heat pump system operating in an independent cooling mode according to an embodiment of the present application;

[0045] FIG9 is a specific flow chart of the combined heat pump system operating in an independent heating mode according to an embodiment of the present application;

[0046] FIG10 is a specific flow chart of the combined heat pump system operating in an independent hot water mode according to an embodiment of the present application; and

[0047] FIG11 is a schematic structural diagram of an operation control device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0048] This section will describe the specific embodiments of the present application in detail. The preferred embodiments of the present application 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 overall technical solution of the present application, but it cannot be understood as a limitation on the scope of protection of the present application.

[0049] In the description of this application, "several" means one or more, "more" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" 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. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly indicating the number of the indicated technical features, or implicitly indicating the order of the indicated technical features.

[0050] It should be noted that the terms "dispose," "install," and "connect" in the embodiments of this application should be interpreted broadly. Those skilled in the art can reasonably determine the specific meanings of these terms in the embodiments of this application based on the specific content of the technical solution. For example, the term "connect" can refer to mechanical connection, electrical connection, or communication; it can refer to direct connection or indirect connection through an intermediary.

[0051] It should be noted that the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0052] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, and connecting 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 this application based on the specific content of the technical solution.

[0053] 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 and be troublesome to install, but also have low energy utilization. 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 the outdoor heat exchanger is exchanging heat, 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 be compatible with the needs of air conditioning and hot water preparation at the same time.

[0054] Based on this, the present application 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 simultaneously meet the needs of air conditioning and hot water preparation, the embodiment of the present application optimizes the connection relationship between each heat exchanger in the combined heat pump system and expands a variety of different refrigerant circuits, thereby changing the heat exchange order 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 multiple 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.

[0055] The embodiments of the present application are further described below with reference to the accompanying drawings.

[0056] 1 , which is a schematic structural diagram of a combined heat pump system of an air conditioner and a heat pump water heater provided by one embodiment of the present application.

[0057] It is understandable 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 102 and an air exhaust 101 .

[0058] 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.

[0059] 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.

[0060] 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 .

[0061] 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 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, pass through the three-way valve 600 and enter the intake port 102 of the compressor 100. After being compressed by compressor 100, the high-temperature, high-pressure refrigerant passes through four-way valve 400 and reaches outdoor heat exchanger 200, where it liquefies and releases heat. After liquefaction and heat release, the refrigerant splits into two paths: one path enters the water tank heat exchanger 500 through water tank refrigerant outlet 502, and the other path enters indoor heat exchanger 300, where it vaporizes and absorbs heat, removing heat from the surrounding environment of indoor heat exchanger 300. Therefore, this refrigerant operation mode can be understood as a combined heat pump system operating in independent cooling mode.

[0062] 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 intake port 102 of the compressor 100, wherein, when the refrigerant flows out of 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, pass through the three-way valve 600 and enter the intake port 102 of the compressor 100. 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.

[0063] 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 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 pass through the four-way valve 400 into the indoor heat exchanger 300, 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 the 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 consisting 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 simultaneously prepares hot water and increases the air temperature, that is, the 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.

[0064] It should be noted that when the fifth end 601 and the seventh end 603 of the three-way valve 600 are connected, and the first end 401 and the third end 403 of the four-way valve 400 are connected, 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 into the water tank heat exchanger 500 through the three-way valve 600, respectively. The refrigerant flowing out of the water tank heat exchanger 500 will mix 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 simultaneously enters the water tank heat exchanger 500 and the outdoor heat exchanger 200 to release heat before entering the indoor heat exchanger 300 can be understood as operating in a coordinated cooling mode of the combined heat pump system, that is, air conditioning and hot water preparation are performed simultaneously.

[0065] It should be noted that when the fifth end 601 and the seventh end 603 of the three-way valve 600 are connected, and the first end 401 and the third end 403 of the four-way valve 400 are connected, the refrigerant output from the exhaust port 101 of the compressor 100 flows through the four-way valve 400 into the outdoor heat exchanger 200 and through the three-way valve 600 into the water tank heat exchanger 500. The refrigerant flowing out of the water tank heat exchanger 500 mixes with the refrigerant flowing out of the outdoor heat exchanger 200 at the first connection point and then enters the indoor heat exchanger 300. By transporting the high-temperature and high-pressure refrigerant to the outdoor heat exchanger 200, the refrigerant liquefies and releases heat in the outdoor heat exchanger 200. The heat generated by the heat release melts the frost attached to the outdoor heat exchanger 200, thereby achieving a defrosting effect. This refrigerant operation method can be understood as the combined heat pump system operating in a defrosting mode.

[0066] It is understood that the combined heat pump system may further include a gas-liquid separator 900, which 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 load change, during the process of the liquid refrigerant becoming gas, some of the refrigerant may not be completely evaporated and directly enter the compressor 100. Due to the incompressibility of the liquid refrigerant, if the liquid refrigerant directly enters the compressor 100, it will cause liquid hammer and damage the compressor 100. Therefore, before the refrigerant enters the compressor 100, the gas and liquid must 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, ensuring that all the refrigerant entering the compressor 100 is gas, thereby ensuring that the compressor 100 can operate normally.

[0067] 2 , in the combined heat pump system provided in an embodiment of the present application, a first control valve 510 is provided between the first connection point and the water tank refrigerant outlet 502 .

[0068] It should be noted that by providing a first control valve 510 between the first connection point and the water tank refrigerant outlet 502, the refrigerant flowing into or out of the water tank refrigerant outlet 502 can be regulated. For example, the first control valve 510 is an expansion valve. When the combined heat pump system operates in cooling mode, the first control valve 510 can be used to intercept the refrigerant so that the refrigerant can only flow from the outdoor heat exchanger 200 to the indoor heat exchanger 300, thereby increasing the refrigerant circulation and improving the cooling effect of the air conditioner. Similarly, when the combined heat pump system operates in heating mode, the first control valve 510 can be used to intercept the refrigerant so that the refrigerant can only flow from the indoor heat exchanger 300 to the outdoor heat exchanger 200, thereby increasing the refrigerant circulation and 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.

[0069] 2 , in the combined heat pump system provided in an embodiment of the present application, 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 .

[0070] 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 realizing the 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, 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.

[0071] It is understood that after the low-temperature, low-pressure refrigerant enters the indoor heat exchanger 300, it may condense within the indoor heat exchanger 300, causing the indoor ambient temperature to drop. Therefore, when the combined heat pump system operates in defrost mode, the second control valve 310 can be closed to prevent the refrigerant, which has released heat in the outdoor heat exchanger 200, from flowing into the indoor heat exchanger 300 and affecting the indoor ambient temperature.

[0072] 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 lowered, thereby realizing the vaporization of part of the liquid refrigerant.

[0073] 2 , in the combined heat pump system provided in an embodiment of the present application, the compressor 100 further includes an enthalpy spray port 103, and the combined heat pump system further includes a first flash evaporator 700, the first flash evaporator 700 including 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.

[0074] It should be noted that by setting up the first flash evaporator 700, when the combined heat pump system operates in heating mode under low temperature environment, the refrigerant flows out from the indoor heat exchanger 300 and enters the first flash evaporator 700 through the first flash refrigerant inlet 701. 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 outdoor heat exchanger 200 through the second flash refrigerant outlet 703, 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.

[0075] The refrigerant is separated into gas and liquid by the first flash evaporator 700, and then the gaseous refrigerant is delivered to the injection port 103 of the compressor 100 for injection enthalpy increase. It is understood that injection enthalpy increase in the compressor 100 can effectively reduce the exhaust temperature of the compressor 100 and prevent the exhaust temperature from overheating. Because the pressure of the compressor 100 is relatively high during system operation, the exhaust gas temperature will be relatively high. In contrast, injection enthalpy increase in the compressor 100 can effectively reduce the internal temperature of the compressor 100, thereby ensuring stable system operation.

[0076] It can be understood that a first solenoid valve 800 is also provided between the first flash refrigerant outlet 702 of the first flash evaporator 700 and the spray enthalpy port 103 of the compressor 100. The first solenoid valve 800 can control the flow rate of the gaseous refrigerant delivered to the spray enthalpy 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 spray enthalpy port 103.

[0077] 3 , the combined heat pump system further 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.

[0078] 3 , the combined heat pump system further 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 .

[0079] It should be noted that when the combined heat pump system operates in cooling mode, after the refrigerant enters the second flash evaporator 710 through the second flash refrigerant inlet 711, the second flash evaporator 710 separates the refrigerant into gas and liquid. The liquid refrigerant is delivered to the second injection inlet 333 of the ejector 320 through the fourth flash refrigerant outlet 713, and the gaseous refrigerant is delivered to the fourth end 404 of the four-way valve 400 through the third flash refrigerant outlet 712. After the liquid refrigerant enters the ejector 320 through the second injection inlet, it meets the refrigerant entering from the first injection inlet 332. The two refrigerants of different pressures mix within the ejector 320 to form a mixed refrigerant, which is then ejected from the injection outlet 331 and enters the indoor heat exchanger 300. By mixing the two refrigerants of different pressures within the ejector 320, energy is exchanged between the two refrigerants, increasing the refrigerant pressure without consuming mechanical energy, thereby improving both the cooling capacity of the air conditioner and energy efficiency.

[0080] It can be understood that a second solenoid valve 810 is also provided 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 conductivity state of the delivery channel between the fourth flash refrigerant outlet 713 and the second injection inlet 333.

[0081] 3 , the combined heat pump system further 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 exchange branch is connected to the fourth end 404 .

[0082] 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, thereby preventing the compressor 100 from generating liquid hammer. Similarly, when the refrigerant condensed through 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.

[0083] 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 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 gas 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.

[0084] 4 , which is a flow chart of a control method for a combined heat pump system provided by an embodiment of the present application, the control method for a combined heat pump system can be applied to the combined heat pump system shown in FIG1 , FIG2 , or FIG3 . The control method includes but is not limited to the following steps:

[0085] Step S100, determining the operation mode of the combined heat pump system;

[0086] In step S200 , the four-way valve and the three-way valve are controlled respectively according to the operation mode to adjust the flow direction of the refrigerant in the combined heat pump system.

[0087] According to the control method provided in the embodiment of the present application, by determining the operating 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 according to the operating mode, the refrigerant flow direction in the combined heat pump system is changed, thereby realizing that the combined heat pump system can adaptively adjust the refrigerant according to the operating mode, so that the combined heat pump system can be compatible with multiple operating modes and effectively improve energy utilization. For example, when the operating mode of the combined heat pump system is 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 release of heat; when the operating mode of the combined heat pump system is 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.

[0088] 5 , which is a specific flow chart of the defrost mode of the combined heat pump system provided by an embodiment of the present application, including but not limited to the following steps:

[0089] 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.

[0090] It is understandable that after the air conditioner runs in heating mode for a long time, frost may form 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, the air conditioner may be damaged. When the operating 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. The frost on the outdoor heat exchanger 200 is melted by releasing heat, thereby achieving the defrosting effect.

[0091] It is understood that after releasing heat in the outdoor heat exchanger 200, the high-temperature, high-pressure refrigerant becomes a low-temperature, low-pressure refrigerant. Upon entering the indoor heat exchanger 300, this low-temperature, low-pressure refrigerant must undergo vaporization and heat exchange, causing the indoor ambient temperature to drop. Therefore, when the combined heat pump system operates in defrost mode, the second control valve 310 can be controlled to close, while the first control valve 510 and the third control valve 210 are opened to prevent the low-temperature, low-pressure refrigerant from entering the indoor heat exchanger 300 and condensing. After the second control valve 310 is closed, the refrigerant flow in the combined heat pump system is as follows: 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 intake port 102 of the compressor 100.

[0092] It is understood that in the combined heat pump system shown in FIG3 , when the combined heat pump system operates in defrost mode, the first control valve 510, the third control valve 210, and the second control valve 310 are all kept open, allowing the refrigerant after heat release through the outdoor heat exchanger 200 to enter the water tank heat exchanger 500 and the indoor heat exchanger 300, respectively. This prevents a large amount of refrigerant from entering the water tank heat exchanger 500 while reducing the amount of refrigerant flowing into the indoor heat exchanger 300. When a large amount of refrigerant enters the water tank heat exchanger 500, the refrigerant pressure on the water tank heat exchanger 500 increases, thereby reducing the service life of the water tank heat exchanger 500. Furthermore, when a large amount of refrigerant enters the indoor unit, the indoor ambient temperature may be significantly affected.

[0093] 6 , which is a specific flow chart of the combined heat pump system operating in the collaborative cooling mode according to an embodiment of the present application, including but not limited to the following steps:

[0094] In 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 .

[0095] 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 to the third end 403 and the second end 402 to 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 making the high-temperature and high-pressure refrigerant discharged from the exhaust port 101 of the compressor 100 and 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 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 being liquefied and heat released 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 a first connection point before being transported to the indoor heat exchanger 300 for vaporization. The gaseous refrigerant then passes through the fourth end 404 of the four-way valve 400 and the second end 402 of the four-way valve 400, respectively, and enters the 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 perform air conditioning and cooling and hot water production, thereby improving energy utilization.

[0096] 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.

[0097] It is understood that in the combined heat pump system shown in FIG3 , the combined heat pump system operates in a coordinated cooling mode. The refrigerant condensed by the outdoor heat exchanger 200 and the refrigerant condensed by the water tank heat exchanger 500 enter the first heat exchange branch of the regenerator 1000. The refrigerant evaporated by the indoor heat exchanger 300 enters the second heat exchange branch. In the regenerator 1000, the refrigerant in the first heat exchange branch exchanges heat with the refrigerant in the second heat exchange branch, lowering the temperature of the refrigerant in the first heat exchange branch and improving the cooling efficiency of the air conditioner. Furthermore, the refrigerant evaporated by the indoor heat exchanger 300 also enters the second flash evaporator 710 , where it undergoes gas-liquid separation. The gaseous refrigerant enters the second heat exchange branch, and the liquid refrigerant enters the ejector 320 , where it mixes with the refrigerant flowing out of the first heat exchange branch before entering the indoor heat exchanger 300. This effectively improves the cooling efficiency of the air conditioner.

[0098] 7 , which is a specific flow chart of the combined heat pump system operating in the collaborative heating mode according to an embodiment of the present application, including but not limited to the following steps:

[0099] In 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 .

[0100] 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 to the fourth end 404 and the third end 403 to the second end 402, 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 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 will be 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 a first connection point before being transported to the outdoor heat exchanger 200 for vaporization. The gaseous refrigerant then passes through the third end 403 and the second end 402 of the four-way valve 400 and enters the 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 perform air conditioning and heating and hot water production, thereby improving energy utilization.

[0101] 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 spray 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.

[0102] It can be understood that in the combined heat pump system shown in Figure 3, 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, making the refrigerant temperature in the second heat exchange branch higher, thereby improving the heating efficiency of the air conditioner.

[0103] 8 , which is a specific flow chart of the combined heat pump system operating in the independent cooling mode according to an embodiment of the present application, including but not limited to the following steps:

[0104] 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 be closed.

[0105] 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 to return to the intake 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 intake port 102 of the compressor 100.

[0106] 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 spray 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.

[0107] In addition, when the combined heat pump system operates in 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 open, 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 and improving the cooling capacity of the air conditioner.

[0108] It is understood that in the combined heat pump system shown in FIG3 , the combined heat pump system operates in independent cooling mode. The refrigerant condensed by the outdoor heat exchanger 200 and the refrigerant condensed by the water tank heat exchanger 500 enter the first heat exchange branch of the regenerator 1000. The refrigerant evaporated by the indoor heat exchanger 300 enters the second heat exchange branch. In the regenerator 1000, the refrigerant in the first heat exchange branch exchanges heat with the refrigerant in the second heat exchange branch, lowering the temperature of the refrigerant in the first heat exchange branch and improving the cooling efficiency of the air conditioner. In addition, the refrigerant evaporated by the indoor heat exchanger 300 also enters the second flash evaporator 710, where it undergoes gas-liquid separation. The gaseous refrigerant enters the second heat exchange branch, and the liquid refrigerant enters the ejector 320, where it mixes with the refrigerant flowing out of the first heat exchange branch before entering the indoor heat exchanger 300, effectively improving the cooling efficiency of the air conditioner.

[0109] 9 , which is a specific flow chart of the combined heat pump system provided in an embodiment of the present application operating in an independent heating mode, including but not limited to the following steps:

[0110] In step S250, when the operation mode is the independent heating mode, the three-way valve is controlled to connect the sixth end 602 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 first control valve is controlled to be closed.

[0111] It is understood that when the combined heat pump system operates in 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. High-temperature and high-pressure refrigerant is discharged from the exhaust port 101 of the compressor 100, enters the four-way valve 400 through the first end 401, and is then 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, raising the indoor ambient temperature. The condensed refrigerant is then split 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 turn and returns to the intake port 102 of the compressor 100; the other path enters the outdoor heat exchanger 200 for vaporization and heat absorption, and the refrigerant changes from liquid to gas, and then the gaseous refrigerant passes through the third end 403 and the second end 402 of the four-way valve 400 and returns to the intake port 102 of the compressor 100.

[0112] 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. The first flash evaporator 700 transports a portion 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 portion of the refrigerant to the outdoor heat exchanger 200 through the second flash refrigerant outlet 703.

[0113] In addition, when the combined heat pump system operates in 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.

[0114] It can be understood that in the combined heat pump system shown in Figure 3, 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, making the refrigerant temperature in the second heat exchange branch higher, thereby improving the heating efficiency of the air conditioner.

[0115] 10 , which is a specific flow chart of the combined heat pump system provided in an embodiment of the present application operating in an independent hot water mode, including but not limited to the following steps:

[0116] In 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.

[0117] It is understood that when the combined heat pump system operates in independent hot water mode, the refrigerant discharged from the exhaust port 101 of the compressor 100 is divided into two paths. One path 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. The other path passes through the four-way valve 400 and enters the indoor heat exchanger 300. Finally, the refrigerant flowing out of the water tank refrigerant outlet 502 mixes with the refrigerant flowing out of the indoor heat exchanger 300 at the first connection point, enters the outdoor heat exchanger 200 for vaporization, and then returns to the intake port 102 of the compressor 100 through the four-way valve 400.

[0118] When the combined heat pump system operates in independent hot water mode, the first control valve 510 and the third control valve 210 are controlled to be open, and the opening of the second control valve 310 is adjusted. When the second control valve 310 is closed, the refrigerant cannot pass through the indoor heat exchanger 300 to enter the outdoor heat exchanger 200. 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 exposed to high-pressure refrigerant for a long time, which may shorten its service life. By adjusting the opening of the second control valve 310, some refrigerant can flow into the indoor heat exchanger 300, thereby reducing the refrigerant pressure on the water tank heat exchanger 500 and extending its service life.

[0119] It should be noted that a reduction in the refrigerant flowing into the water tank heat exchanger 500 may result in a decrease in the efficiency of hot water preparation. By controlling the opening of the second control valve 310 so that the opening of the second control valve 310 is less than a preset opening threshold, the impact of refrigerant diversion on the hot water preparation efficiency can be reduced. In other words, when the opening of the second control valve 310 is greater than the preset opening threshold, the water tank heat exchanger 500 will experience a decrease in hot water preparation efficiency due to the reduction in the refrigerant flowing into it.

[0120] It is understood 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 by the pressure sensor. When the refrigerant pressure is greater than the maximum pressure tolerance of the water tank heat exchanger 500, the opening of the second control valve 310 can be increased to reduce the refrigerant flow in the water tank heat exchanger 500, thereby reducing the refrigerant pressure and preventing damage to the water tank heat exchanger 500 due to excessive refrigerant pressure. When the refrigerant pressure is less than the maximum pressure tolerance of the water tank heat exchanger 500, the opening of the second control valve 310 can be reduced to increase the refrigerant flow in the water tank heat exchanger 500, avoiding a decrease in hot water preparation efficiency due to insufficient refrigerant flow in the water tank heat exchanger 500.

[0121] 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 through the first flash refrigerant outlet 701 to the injection enthalpy port 103 of the compressor 100 to perform injection enthalpy supplement on the compressor 100.

[0122] It can be understood that in the combined heat pump system shown in Figure 3, 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.

[0123] 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 the 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 improving 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. After heat release, the refrigerant 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 replenishes gas and increases enthalpy to the injection enthalpy port 103 of the compressor 100 through the first flash evaporation outlet. 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, thereby achieving air conditioning and cooling. 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. 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 to 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. The liquid refrigerant evaporates in the outdoor heat exchanger 200 and absorbs heat around the outdoor heat exchanger 200, and finally returns to the 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 for liquefaction and heat release 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, 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 to 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, 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 the 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 spray enthalpy port 103 of the compressor 100 through the first flash refrigerant outlet 702. 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.

[0124] In the third aspect, referring to Figure 11, an embodiment of the present application provides an operation control device 1100, including a memory 1110, a processor 1120, and a computer program stored on 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 aspect embodiment above, for example, executing method steps S100 to S200 in Figure 4, method step S210 in Figure 5, method step S220 in Figure 6, method step S230 in Figure 7, method step S240 in Figure 8, method step S250 in Figure 9, and method step S260 in Figure 10.

[0125] Memory 1110, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs, such as the control method for the combined heat pump system in the above-mentioned embodiments of the present application. Processor 1120 implements the control method for the combined heat pump system in the above-mentioned embodiments of the present application by executing the non-transitory software programs and instructions stored in memory 1110.

[0126] 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-volatile memory 1110, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. It should be noted that the memory 1110 may optionally include a memory 1110 remotely located 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.

[0127] In the fourth aspect, the embodiment of the present application provides a combined heat pump system of an air conditioner and a heat pump water heater, and the combined heat pump system of the air conditioner and the heat pump water heater includes 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, the refrigerant circuit is fixed. Due to limitations, it is impossible to simultaneously meet the needs of air conditioning and hot water preparation. The embodiments of the present application can, after determining the operating mode of the combined heat pump system, 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.

[0128] In the fifth aspect, an embodiment of the present application provides a computer-readable storage medium, which stores computer-executable instructions. The computer-executable instructions are used to enable a computer to execute the control method of the second aspect embodiment above, such as executing method steps S100 to S200 in Figure 4, method step S210 in Figure 5, method step S220 in Figure 6, method step S230 in Figure 7, method step S240 in Figure 8, method step S250 in Figure 9, and method step S260 in Figure 10.

[0129] It will be understood by those skilled in the art that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and appropriate combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on computer-readable media, which can include computer storage media or non-transitory media and communication media or transient media. As is well known to those skilled in the art, the term computer storage media 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 includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVDs) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, as is well known to those skilled in the art, 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.

[0130] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the technical field without departing from the purpose of the present application.

Claims

1. A combined heat pump system of an air conditioner and a heat pump water heater, comprising: 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, wherein the first connection point is located in a refrigerant pipeline between the indoor heat exchanger and the outdoor heat exchanger; and 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 , further comprising a first control valve disposed between the first connection point and the refrigerant outlet of the water tank. 3 . 3 . The combined heat pump system according to claim 2 , further comprising a second control valve disposed between the first connection point and the indoor heat exchanger, and a third control valve disposed between the first connection point and the outdoor heat exchanger.

4. The heat pump system according to any one of claims 1 to 3, further comprising a first flash evaporator, wherein: The compressor further includes an enthalpy spray port, and 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.

5. The combined heat pump system according to any one of claims 1 to 4, further comprising a second flash evaporator, wherein the second flash evaporator comprises 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 further comprises an ejector, wherein the ejector comprises 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 6, further comprising a heat regenerator, wherein the heat regenerator comprises 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, applied to the combined heat pump system of an air conditioner and a heat pump water heater as claimed in any one of claims 1 to 7, the control method comprising: determining an operating mode of the combined heat pump system; as well as 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, wherein: 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. end.

10. The control method according to claim 8 or 9, wherein: 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 any one of claims 8 to 10, wherein: 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 any one of claims 8 to 11, wherein: 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, 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 the control method of the combined heat pump system of an air conditioner and a 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, comprising the operation control device according to claim 13.

15. A computer-readable storage medium storing computer-executable instructions, wherein 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 according to claims 8 to 12.

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