Air conditioner heat pump system and control method thereof

Abstract

The invention discloses an air conditioner heat pump system and a control method thereof. The air conditioner heat pump system comprises a refrigerant circulation main loop, a first reversing mechanism, a domestic hot water heat exchanger and a control assembly. The refrigerant circulation main loop comprises a compressor, a four-way valve, an outdoor heat exchanger, a first throttling device and an indoor heat exchanger. The control assembly comprises a first control valve and a second control valve. The air conditioner heat pump system comprises a hot water defrosting mode, a refrigerating mode and a heating mode, and the four-way valve, the first reversing mechanism and the control assembly are controlled so that the air conditioner heat pump system can be switched between at least two of the hot water defrosting mode, the refrigerating mode and the heating mode. According to the air conditioner heat pump system and the control method thereof, the indoor mode cannot be switched to the refrigeration mode during defrosting, and the use experience of a user can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air conditioning heat pump system and a control method thereof. Background Art

[0002] During winter heating, when the outdoor temperature is low, frost often forms on the heat pump's outdoor heat exchanger (finned heat exchanger), affecting heat exchange efficiency and the unit's heating capacity. When frost accumulates to a certain level, it can cause the unit to shut down and alarm. Therefore, defrosting is necessary when the unit reaches a certain level of frost.

[0003] In the prior art, during defrosting in winter, the working mode of the outdoor host will switch from heating mode to cooling mode, causing the indoor terminal equipment to switch to cooling mode for a short time when the indoor system was originally heating, affecting the user experience. Summary of the Invention

[0004] The main purpose of the present invention is to provide an air-conditioning heat pump system and a control method thereof, which can prevent the indoor room from switching to a cooling mode during defrosting, thereby improving the user experience.

[0005] According to one aspect of the present invention, there is provided an air conditioning heat pump system, comprising:

[0006] A refrigerant circulation main loop, the refrigerant circulation main loop includes a compressor, a four-way valve, an outdoor heat exchanger, a first throttling device and an indoor heat exchanger, the compressor includes an exhaust port and a return air port, the outdoor heat exchanger includes a first port and a second port, the first throttling device includes a third port and a fourth port, the indoor heat exchanger includes a fifth port and a sixth port, the four-way valve includes a first valve port, a second valve port, a third valve port and a fourth valve port, the exhaust port and the first valve port, the second valve port and the first port, the second port and the third port, the fourth port and the fifth port, the sixth port and the third valve port, and the fourth valve port and the return air port are all connected by pipelines;

[0007] The air conditioning heat pump system further includes a first reversing mechanism and a domestic hot water heat exchanger, the domestic hot water heat exchanger including a seventh port and an eighth port, the fourth port being connected to the seventh port via a pipe through the first reversing mechanism, the fourth port being connected to the fifth port via a pipe through the first reversing mechanism, and the eighth port being connected to the return air port via a pipe;

[0008] A control assembly, the control assembly including a first control valve and a second control valve, the first control valve including a fifth valve port and a sixth valve port, the fifth valve port and the first reversing mechanism, and the sixth valve port and the seventh port are both connected via a pipeline, the second control valve including a seventh valve port and an eighth valve port, the seventh valve port and the eighth port, and the eighth valve port are connected to the pipeline between the fourth valve port and the return port via a pipeline;

[0009] In which, the air-conditioning heat pump system includes a hot water defrost mode, a cooling mode and a heating mode. By controlling the four-way valve, the first reversing mechanism and the control component, the air-conditioning heat pump system can switch between at least any two modes among the hot water defrost mode, the cooling mode and the heating mode.

[0010] Furthermore, the air conditioning heat pump system also includes a hot water tank, the hot water tank includes a liquid inlet and a liquid outlet, the domestic hot water heat exchanger includes a water inlet and a water outlet, and the liquid outlet and the water inlet, and the water outlet and the liquid inlet are connected by pipes.

[0011] Further, the control assembly further includes a second reversing mechanism and a third control valve, the exhaust port is connected to the first valve port through a pipeline via the second reversing mechanism, and / or the exhaust port is connected to the seventh port through a pipeline via the second reversing mechanism, the third control valve includes a ninth valve port and a tenth valve port, the ninth valve port is connected to the eighth port through a pipeline, and the tenth valve port is connected to the pipeline between the second reversing mechanism and the first valve port through a pipeline;

[0012] In which, the air-conditioning heat pump system also includes a cooling + partial heat recovery mode, a heating + domestic hot water mode and a domestic hot water mode. By controlling the four-way valve, the first reversing mechanism, and the control component, the air-conditioning heat pump system can switch between at least any two modes of the hot water defrosting mode, the cooling mode, the heating mode, the cooling + partial heat recovery mode, the heating + domestic hot water mode and the domestic hot water mode.

[0013] Furthermore, the first control valve and the third control valve are both one-way valves, wherein the first control valve is connected along the first reversing mechanism to the seventh port, the third control valve is connected along the eighth port to the pipeline between the second reversing mechanism and the first valve port, and the second control valve is a two-way valve.

[0014] Furthermore, the air-conditioning heat pump system also includes a second throttling device, which includes a first connecting port and a second connecting port, and the first connecting port and the fourth port, and the second connecting port and the first reversing mechanism are connected through pipes, wherein, when the air-conditioning heat pump system is in the cooling mode, the first throttling device is the main control valve, and when the air-conditioning heat pump system is in the heating mode, the second throttling device is the main control valve.

[0015] Furthermore, the compressor further includes an air supply port; and / or,

[0016] The air conditioning heat pump system also includes an economizer and a third throttling device. The economizer includes a ninth port, a tenth port, an eleventh port, and a twelfth port. The third throttling device includes a thirteenth port and a fourteenth port. The ninth port and the fourth port, the tenth port and the fourteenth port, the eleventh port and the air supply port, and the twelfth port and the first connecting port are all connected through pipelines. The thirteenth port is connected to the pipeline between the twelfth port and the first connecting port through a pipeline.

[0017] Furthermore, the air-conditioning heat pump system also includes a first filter and a second filter, the first filter includes a fifteenth port and a sixteenth port, the fifteenth port and the second port, and the sixteenth port and the third port are connected by pipes, the second filter includes a seventeenth port and an eighteenth port, the seventeenth port and the second connecting port, and the eighteenth port are connected to the fifth port through pipes via the first reversing mechanism.

[0018] Furthermore, the air conditioning heat pump system further includes a liquid storage device, the liquid storage device including a nineteenth port and a twentieth port, the nineteenth port and the eighteenth port, and the twentieth port and the fifth port are connected through a pipeline via the first reversing mechanism; and / or,

[0019] The air conditioning heat pump system also includes an air separation device, which includes a 21st port and a 22nd port. The 21st port and the fourth valve port or the eighth valve port, and the 22nd port and the return air port are all connected through pipelines.

[0020] Furthermore, the air-conditioning heat pump system also includes a pressure relief branch, which includes a fourth control valve and a fourth throttling device. The fourth control valve includes an eleventh valve port and a twelfth valve port. The fourth throttling device includes a twenty-third port and a twenty-fourth port. The eleventh valve port is connected to the pipe between the fourth valve port and the twenty-first port through a pipe, and the twelfth valve port and the twenty-third port, as well as the twenty-fourth port and the exhaust port are all connected through pipes.

[0021] On the other hand, the present application also provides a control method for an air conditioning heat pump system, which controls the above-mentioned air conditioning heat pump system;

[0022] The four-way valve, the first reversing mechanism, and the control component are controlled to make the refrigerant of the air-conditioning heat pump system flow along the first circulation loop, wherein the refrigerant flow path in the first circulation loop is that the refrigerant flows through the exhaust port of the compressor, the outdoor heat exchanger, the first throttling device, the domestic hot water heat exchanger, and the return air port of the compressor in sequence. At this time, the air-conditioning heat pump system is in the hot water defrosting mode; or,

[0023] The four-way valve, the first reversing mechanism, and the control component are controlled to make the refrigerant of the air-conditioning heat pump system flow along the second circulation loop, wherein the refrigerant flow path in the second circulation loop is that the refrigerant flows through the exhaust port of the compressor, the outdoor heat exchanger, the first throttling device, the indoor heat exchanger, and the return air port in sequence. At this time, the air-conditioning heat pump system is in cooling mode; or,

[0024] The four-way valve, the first reversing mechanism, and the control component are controlled to make the refrigerant of the air-conditioning heat pump system flow along the third circulation loop, wherein the refrigerant flow path in the third circulation loop is that the refrigerant flows through the exhaust port of the compressor, the indoor heat exchanger, the first throttling device, the outdoor heat exchanger, and the return air port in sequence. At this time, the air-conditioning heat pump system is in heating mode; or,

[0025] The four-way valve, the first reversing mechanism, and the control component are controlled to make the refrigerant of the air-conditioning heat pump system flow along a fourth circulation loop, wherein the refrigerant flow path in the fourth circulation loop is that the refrigerant flows through the exhaust port of the compressor, the domestic hot water heat exchanger, the outdoor heat exchanger, the first throttling device, the indoor heat exchanger, and the return air port in sequence. At this time, the air-conditioning heat pump system is in a cooling + partial heat recovery mode; or,

[0026] The four-way valve, the first reversing mechanism, and the control component are controlled to make the refrigerant of the air-conditioning heat pump system flow along the fifth circulation loop, wherein the refrigerant flow path in the fifth circulation loop is that the refrigerant flows in sequence through the exhaust port of the compressor, the domestic hot water heat exchanger, the indoor heat exchanger, the first throttling device, the outdoor heat exchanger, and the return air port. At this time, the air-conditioning heat pump system is in the heating + domestic hot water mode; or,

[0027] The four-way valve, the first reversing mechanism and the control component are controlled to make the refrigerant of the air-conditioning heat pump system flow along the sixth circulation loop, wherein the refrigerant flow path in the sixth circulation loop is that the refrigerant flows through the exhaust port of the compressor, the domestic hot water heat exchanger, the indoor heat exchanger, the first throttling device, the outdoor heat exchanger and the return air port in sequence. At this time, the air-conditioning heat pump system is in the domestic hot water production mode.

[0028] In the present invention, since a first reversing mechanism is provided on the refrigerant circulation main circuit of the air-conditioning heat pump system, in actual use, by controlling the four-way valve, the first reversing mechanism and the control component on the refrigerant circulation main circuit, the air-conditioning heat pump system can be defrosted in winter without switching to the cooling mode indoors, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0030] Figure 1 A diagram showing a portion of the connection relationships in the air-conditioning heat pump system disclosed in the embodiment of the present application;

[0031] Figure 2 A connection diagram of another part of the air-conditioning heat pump system disclosed in an embodiment of the present application;

[0032] Figure 3 A connection diagram of the overall structure of the air-conditioning heat pump system disclosed in the embodiment of the present application;

[0033] Figure 4 This is a refrigerant flow diagram of the air-conditioning heat pump system disclosed in an embodiment of the present application in hot water defrosting mode;

[0034] Figure 5 This is a refrigerant flow diagram of the air-conditioning heat pump system disclosed in an embodiment of the present application in cooling mode;

[0035] Figure 6 This is a refrigerant flow diagram of the air-conditioning heat pump system disclosed in an embodiment of the present application in heating mode;

[0036] Figure 7 This is a refrigerant flow diagram of the air-conditioning heat pump system disclosed in an embodiment of the present application in the cooling + partial heat recovery mode;

[0037] Figure 8 This is a refrigerant flow diagram of the air conditioning heat pump system disclosed in the embodiment of this application in the heating + domestic hot water mode;

[0038] Figure 9 This is a refrigerant flow diagram of the air-conditioning heat pump system disclosed in an embodiment of the present application in the domestic hot water production mode;

[0039] Figure 10 This is a flow diagram of the refrigerant in the pressure relief branch of the air-conditioning heat pump system disclosed in the embodiment of the present application.

[0040] The above drawings include the following reference numerals:

[0041] 10. Compressor; 11. Exhaust port; 12. Return air port; 13. Air supply port; 20. Four-way valve; 21. First valve port; 22. Second valve port; 23. Third valve port; 24. Fourth valve port; 30. Outdoor heat exchanger; 31. First port; 32. Second port; 40. First throttling device; 41. Third port; 42. Fourth port; 50. Indoor heat exchanger; 51. Fifth port; 52. Sixth port; 53. Water inlet pipe; 54. Water outlet pipe; 60. First reversing mechanism; 61. Tenth Three valve ports; 62, 14th valve port; 63, 15th valve port; 64, 16th valve port; 70, domestic hot water heat exchanger; 71, 7th port; 72, 8th port; 73, water inlet; 74, water outlet; 80, first control valve; 81, 5th valve port; 82, 6th valve port; 90, second control valve; 91, 7th valve port; 92, 8th valve port; 100, hot water tank; 101, liquid inlet; 102, liquid outlet; 110, first pump body; 120, first temperature sensor; 130, second Reversing mechanism; 140, third control valve; 141, ninth valve port; 142, tenth valve port; 150, second temperature sensor; 160, second pump body; 170, economizer; 171, ninth port; 172, tenth port; 173, eleventh port; 174, twelfth port; 180, third throttling device; 181, thirteenth port; 182, fourteenth port; 190, first filter; 191, fifteenth port; 192, sixteenth port; 200, second filter; 2 01, the seventeenth port; 202, the eighteenth port; 210, the liquid storage device; 211, the nineteenth port; 212, the twentieth port; 220, the gas separation device; 221, the twenty-first port; 222, the twenty-second port; 230, the fourth control valve; 231, the eleventh valve port; 232, the twelfth valve port; 240, the fourth throttling device; 241, the twenty-third port; 242, the twenty-fourth port; 250, the second throttling device; 251, the first connecting port; 252, the second connecting port. DETAILED DESCRIPTION

[0042] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0043] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0044] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorized specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0045] As mentioned in the background technology, during winter heating, when the outdoor ambient temperature is low, frost often forms on the surface of the heat pump's outdoor heat exchanger (fin heat exchanger), affecting heat exchange efficiency and the unit's heating capacity. When the frost accumulates to a certain level, it can cause the unit to alarm and shut down. Therefore, when the unit's frost reaches a certain level, defrosting is necessary.

[0046] In the prior art, during winter defrosting, the outdoor main unit's operating mode switches from heating to cooling. This causes the indoor terminal equipment to briefly switch to cooling mode when the indoor unit is originally heating, impacting the user experience. To address this issue, the present application provides an air conditioning heat pump system that prevents the indoor unit from switching to cooling mode during defrosting, thereby improving the user experience. The following detailed description of the air conditioning heat pump system is provided in conjunction with the accompanying drawings.

[0047] See also Figure 1 and Figure 3 As shown, according to an embodiment of the present application, an air conditioning heat pump system is provided, which includes a refrigerant circulation main loop, a first reversing mechanism 60, a domestic hot water heat exchanger 70, and a control component.

[0048] like Figures 1 to 3As shown, the main refrigerant circulation loop includes a compressor 10, a four-way valve 20, an outdoor heat exchanger 30, a first throttling device 40, and an indoor heat exchanger 50. The compressor 10 includes an exhaust port 11 and a return port 12; the outdoor heat exchanger 30 includes a first port 31 and a second port 32; the first throttling device 40 includes a third port 41 and a fourth port 42; the indoor heat exchanger 50 includes a fifth port 51 and a sixth port 52; and the four-way valve 20 includes a first valve port 21, a second valve port 22, a third valve port 23, and a fourth valve port 24. Pipes connect the exhaust port 11 to the first valve port 21, the second valve port 22 to the first port 31, the second port 32 to the third port 41, the fourth port 42 to the fifth port 51, the sixth port 52 to the third valve port 23, and the fourth valve port 24 to the return port 12. The first throttling device 40 includes a throttling element such as a throttling expansion valve or a capillary tube.

[0049] The air conditioning heat pump system also includes a first reversing mechanism 60 and a domestic hot water heat exchanger 70. The domestic hot water heat exchanger 70 includes a seventh port 71 and an eighth port 72. The fourth port 42 is connected to the seventh port 71 via a pipe through the first reversing mechanism 60. The fourth port 42 is connected to the fifth port 51 via a pipe through the first reversing mechanism 60. The eighth port 72 is connected to the return air port 12 via a pipe. In this embodiment, the provision of the first reversing mechanism 60 allows for flexible switching of operating modes. The provision of the domestic hot water heat exchanger 70 not only simplifies the structure of the air conditioning heat pump system but also improves energy efficiency. For example, the domestic hot water heat exchanger 70 can be a double-tube heat exchanger, which has high heat transfer efficiency and a simple structure.

[0050] The control component includes a first control valve 80 and a second control valve 90. The first control valve 80 includes a fifth valve port 81 and a sixth valve port 82. The fifth valve port 81 and the first reversing mechanism 60, and the sixth valve port 82 and the seventh port 71 are connected through pipelines. The second control valve 90 includes a seventh valve port 91 and an eighth valve port 92. The seventh valve port 91 and the eighth port 72, and the eighth valve port 92 are connected to the pipeline between the fourth valve port 24 and the return air port 12 through pipelines.

[0051] Furthermore, in this embodiment, the first reversing mechanism 60 can be a three-way valve or a four-way valve. In this embodiment, the first reversing mechanism 60 is preferably a four-way valve. The four-way valve can more flexibly control the flow of refrigerant in different circuits or in different directions. For example, when the system is in hot water defrosting mode or heat recovery mode, the four-way valve can more accurately control the flow direction of the refrigerant to achieve better results. Specifically, the first reversing mechanism 60 includes a thirteenth valve port 61, a fourteenth valve port 62, a fifteenth valve port 63 and a sixteenth valve port 64, wherein the thirteenth valve port 61 and the fourth port 42, the fourteenth valve port 62 and the fifth valve port 81, and the sixteenth valve port 64 and the fifth port 51 are all connected by a pipeline, and the fifteenth valve port 63 is connected to the pipeline between the fourth valve port 24 and the return air port 12 through a pipeline. The main function of this pipeline is to facilitate the smooth switching of the four-way valve in different modes.

[0052] The air conditioning heat pump system in this embodiment includes a hot water defrost mode, a cooling mode and a heating mode. By controlling the four-way valve 20, the first reversing mechanism 60 and the control component, the air conditioning heat pump system can switch between at least any two modes among the hot water defrost mode, the cooling mode and the heating mode.

[0053] Specifically, combined Figure 1 As shown, when the air conditioning heat pump system needs to be switched to the hot water defrost mode, it is only necessary to control the first control valve 80 and the second control valve 90 to open, control the first valve port 21 and the second valve port 22 of the four-way valve 20 to be conductive, and make the thirteenth valve port 61 and the fourteenth valve port 62 of the first reversing mechanism 60 conductive, and control all other valves in the air conditioning heat pump system to be closed. Figure 4 As shown, the refrigerant in the main refrigerant circulation loop flows through the exhaust port 11 of the compressor 10, the four-way valve 20, the outdoor heat exchanger 30, the first throttling device 40, the domestic hot water heat exchanger 70 and the return air port 12 of the compressor 10 in sequence to start a new cycle.

[0054] Combine Figure 1 As shown, when the air conditioning heat pump system needs to be switched to cooling mode, it is only necessary to control the first valve port 21 and the second valve port 22 of the four-way valve 20 to be conductive, the third valve port 23 and the fourth valve port 24 to be conductive, the thirteenth valve port 61 and the sixteenth valve port 64 of the first reversing mechanism 60 to be conductive, and all other valves in the air conditioning heat pump system to be closed. Figure 5 As shown, the refrigerant in the main refrigerant circulation loop flows in sequence through the exhaust port 11 of the compressor 10, the four-way valve 20, the outdoor heat exchanger 30, the first throttling device 40, the indoor heat exchanger 50, the four-way valve 20, and the return air port 12 of the compressor 10 to start a new cycle.

[0055] Combine Figure 1As shown, when the air conditioning heat pump system needs to be switched to the heating mode, it is only necessary to control the first valve port 21 and the third valve port 23 of the four-way valve 20 to be connected, the second valve port 22 and the fourth valve port 24 to be connected, the sixteenth valve port 64 and the thirteenth valve port 61 of the first reversing mechanism 60 to be connected, and all other valves in the air conditioning heat pump system to be closed. Figure 6 As shown, the refrigerant in the main refrigerant circulation loop flows in sequence through the exhaust port 11 of the compressor 10, the four-way valve 20, the indoor heat exchanger 50, the first throttling device 40, the outdoor heat exchanger 30, the four-way valve 20, and the return air port 12 of the compressor 10 to start a new cycle.

[0056] It can be seen that since the air-conditioning heat pump system in this embodiment is provided with a first reversing mechanism 60, a domestic hot water heat exchanger 70 and a control component, in actual use, by controlling the four-way valve 20, the first reversing mechanism 60 and the control component on the main refrigerant circulation loop, the air-conditioning heat pump system can be enabled to not switch to the cooling mode indoors during defrosting, thereby improving the user experience.

[0057] like Figures 1 to 3 As shown, the air conditioning heat pump system also includes a hot water tank 100, which includes a liquid inlet 101 and a liquid outlet 102. The domestic hot water heat exchanger 70 includes a water inlet 73 and a water outlet 74. The liquid outlet 102 and the water inlet 73, as well as the water outlet 74 and the liquid inlet 101 are connected by pipes, and a first pump body 110 and a first temperature sensor 120 are provided on the pipe between the liquid outlet 102 and the water inlet 73. The first temperature sensor 120 is used to monitor the temperature of the water flow in the pipe. The air conditioning heat pump system obtains a "temperature signal" and outputs a "control instruction" through the first temperature sensor 120, so that the heat energy transfer process between the hot water tank 100 and the domestic hot water heat exchanger 70 is always in a dynamic equilibrium state, which not only meets the user's real-time temperature needs, but also ensures the efficient and safe operation of the air conditioning heat pump system. Of course, in other embodiments of the present application, the first pump body 110 and / or the first temperature sensor 120 can also be disposed on the pipe between the water outlet 74 and the liquid inlet 101. The specific location is not limited in this application and can be selected as needed during actual installation. In this embodiment, the hot water tank 100 is provided as the water source for the domestic hot water heat exchanger 70, and heat is transferred to the water in the hot water tank 100 through the domestic hot water heat exchanger 70, or the hot water in the hot water tank 100 transfers heat to the refrigerant through the domestic hot water heat exchanger 70, thereby improving energy utilization and achieving energy conservation.

[0058] like Figures 1 to 3As shown, the control assembly also includes a second reversing mechanism 130 and a third control valve 140. The exhaust port 11 is connected to the first valve port 21 through a pipe via the second reversing mechanism 130. In this embodiment, the exhaust port 11 can also be connected to the seventh port 71 through a pipe via the second reversing mechanism 130. The third control valve 140 includes a ninth valve port 141 and a tenth valve port 142. The ninth valve port 141 is connected to the eighth port 72 through a pipe, and the tenth valve port 142 is connected to the pipe between the second reversing mechanism 130 and the first valve port 21 through a pipe. For example, the second reversing mechanism 130 can be a three-way valve or a four-way valve. The three-way valve has a simple structure, low cost, and is easy to install. In this embodiment, only two directions of reversing are required. Therefore, it is preferred that the second reversing mechanism 130 is a three-way valve. In addition, in the present application, by controlling the conduction / closing of the third control valve 140, the air conditioning heat pump system can be switched between different modes.

[0059] Among them, the air-conditioning heat pump system also includes a cooling + partial heat recovery mode, a heating + domestic hot water mode and a domestic hot water mode. By controlling the four-way valve 20, the first reversing mechanism 60 and the control component, the air-conditioning heat pump system can be switched between at least any two modes of hot water defrosting mode, cooling mode, heating mode, cooling + partial heat recovery mode, heating + domestic hot water mode and domestic hot water mode.

[0060] Specifically, combined Figure 3 As shown, when the air conditioning heat pump system needs to switch to the cooling + partial heat recovery mode, it is only necessary to control the second reversing mechanism 130 to be connected to the seventh port 71, control the third control valve 140 to open, control the first valve port 21 and the second valve port 22, the third valve port 23 and the fourth valve port 24 of the four-way valve 20 to be connected, and control the thirteenth valve port 61 and the sixteenth valve port 64 of the first reversing mechanism 60 to be connected, and control the other valves in the air conditioning heat pump system to be closed. Figure 7 As shown, the refrigerant in the main refrigerant circulation loop flows in sequence through the exhaust port 11 of the compressor 10, the second reversing mechanism 130, the domestic hot water heat exchanger 70, the four-way valve 20, the outdoor heat exchanger 30, the first throttling device 40, the first reversing mechanism 60, the indoor heat exchanger 50, the four-way valve 20, and the return air port 12 of the compressor 10 to start a new cycle.

[0061] Partial heat recovery means that the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 10 does not undergo phase change in the domestic hot water heat exchanger 70 and does not release the phase change latent heat.

[0062] Combine Figure 3As shown, when the air conditioning heat pump system needs to switch to the heating + domestic hot water mode, it is only necessary to control the second reversing mechanism 130 to be connected to the seventh port 71, control the third control valve 140 to be open, control the first valve port 21 of the four-way valve 20 to be connected to the third valve port 23, control the second valve port 22 to be connected to the fourth valve port 24, and control the sixteenth valve port 64 of the first reversing mechanism 60 to be connected to the thirteenth valve port 61, and control the other valves in the air conditioning heat pump system to be closed. Figure 8 As shown, the refrigerant in the main refrigerant circulation loop flows in sequence through the exhaust port 11 of the compressor 10, the second reversing mechanism 130, the domestic hot water heat exchanger 70, the four-way valve 20, the indoor heat exchanger 50, the first reversing mechanism 60, the first throttling device 40, the outdoor heat exchanger 30, the four-way valve 20, and the return air port 12 of the compressor 10 to start a new cycle.

[0063] Combine Figure 3 As shown, when the air conditioning heat pump system needs to switch to the domestic hot water production mode, it is only necessary to control the second reversing mechanism 130 to be connected to the seventh port 71, control the third control valve 140 to be open, control the first valve port 21 of the four-way valve 20 to be connected to the third valve port 23, control the second valve port 22 to be connected to the fourth valve port 24, and control the sixteenth valve port 64 of the first reversing mechanism 60 to be connected to the thirteenth valve port 61, and control the other valves in the air conditioning heat pump system to be closed. Figure 9 As shown, the refrigerant in the main refrigerant circulation loop flows in sequence through the exhaust port 11 of the compressor 10, the second reversing mechanism 130, the domestic hot water heat exchanger 70, the four-way valve 20, the indoor heat exchanger 50, the first reversing mechanism 60, the first throttling device 40, the outdoor heat exchanger 30, the four-way valve 20, and the return air port 12 of the compressor 10 to start a new cycle.

[0064] like Figures 1 to 3 As shown, the first control valve 80 and the third control valve 140 are both one-way valves, wherein the first control valve 80 is connected along the first reversing mechanism 60 to the seventh port 71, and the third control valve 140 is connected along the eighth port 72 to the pipeline between the second reversing mechanism 130 and the first valve port 21. Such an arrangement ensures the one-way flow of the refrigerant, prevents backflow and protects system components, thereby ensuring the directionality and stability of the refrigerant flow in the entire air-conditioning heat pump system and maintaining the normal operation of the system. In addition, the second control valve 90 can be a one-way valve or a two-way valve. Of course, in other embodiments of the present application, the second control valve 90 can also be a solenoid valve, etc., which is not specifically limited in this application.

[0065] like Figures 1 to 3As shown, the air conditioning heat pump system also includes a second throttling device 250. The second throttling device 250 includes a first connecting port 251 and a second connecting port 252, and the first connecting port 251 and the fourth port 42, and the second connecting port 252 and the first reversing mechanism 60 are connected by pipes. When the air conditioning heat pump system is in cooling mode, the first throttling device 40 is the main control valve, and when the air conditioning heat pump system is in heating mode, the second throttling device 250 is the main control valve. With this arrangement, in cooling mode, the refrigerant flow direction is opposite to that in heating mode, and the high-pressure side and low-pressure side of the system also change accordingly. Using different throttling devices as the main control valve can more accurately match the refrigerant flow, pressure and superheat control requirements in the current operating mode, thereby improving system efficiency. In addition, such an arrangement can also optimize the refrigerant circulation process, reduce energy loss, and improve heating or cooling efficiency.

[0066] like Figures 1 to 3 As shown, the indoor heat exchanger 50 further includes a water inlet pipe 53 and a water outlet pipe 54. A second temperature sensor 150 and a second pump 160 are disposed on the water inlet pipe 53. The second temperature sensor 150 accurately measures the temperature of the water flowing in the water inlet pipe 53. The second pump 160 provides power to the water in the water inlet pipe 53, causing the water to circulate within the indoor heat exchanger 50. For example, the second temperature sensor 150 may be a temperature sensor bulb.

[0067] like Figures 1 to 3 As shown, the compressor 10 also includes an air supply port 13, and the air conditioning heat pump system also includes an economizer 170 and a third throttling device 180. The economizer 170 and the third throttling device 180 are provided on the main refrigerant circulation loop, so that the air conditioning heat pump system can achieve enthalpy increase according to different operating conditions and needs, thereby improving the operating efficiency and heating effect of the air conditioning heat pump in cold environments. Specifically, the economizer 170 includes a ninth port 171, a tenth port 172, an eleventh port 173, and a twelfth port 174. The third throttling device 180 includes a thirteenth port 181 and a fourteenth port 182. Pipes connect the ninth port 171 to the fourth port 42, the tenth port 172 to the fourteenth port 182, the eleventh port 173 to the air supply port 13, and the twelfth port 174 to the first connecting port 251. The thirteenth port 181 is connected to the pipe between the twelfth port 174 and the first connecting port 251 via a pipe.

[0068] Specifically, economizer 170 can enhance cooling and heating capacity and improve energy efficiency. Economizer 170 operates by allowing a portion of the refrigerant to undergo secondary throttling and evaporation, producing low-temperature, low-pressure refrigerant vapor. This vapor enters the central chamber of compressor 10 through the air inlet 13, increasing the compressor's exhaust volume and thereby improving the system's cooling and heating capabilities. In cold winter months, air inlet allows compressor 10 to output more heat, meeting indoor heating needs; in hot summer months, it also increases cooling capacity, allowing indoor temperatures to reach the set point more quickly. The air inlet circulation in economizer 170 allows compressor 10 to operate under more optimal conditions, lowering its compression ratio and reducing its power consumption. Compressor 10 is equipped with an air inlet 13, which lowers the compressor's exhaust temperature, preventing failure due to overheating and extending its service life. Furthermore, a stable exhaust temperature helps maintain the physical properties of the refrigerant within the system, ensuring stable system operation.

[0069] See again Figures 1 to 3 As shown, the air conditioning heat pump system also includes a first filter 190 and a second filter 200. In this embodiment, the first filter 190 and the second filter 200 are provided to protect the first throttling device 40 and the second throttling device 250, respectively, to prevent blockage of the throttling device or the refrigerant flow channel, thereby avoiding affecting the throttling effect, thereby improving the operational stability of the system. The first filter 190 includes a fifteenth port 191 and a sixteenth port 192, with the fifteenth port 191 and the second port 32, and the sixteenth port 192 and the third port 41 being connected via pipes. The second filter 200 includes a seventeenth port 201 and an eighteenth port 202, with the seventeenth port 201 and the second connecting port 252, and the eighteenth port 202 being connected via pipes to the fifth port 51 via the first reversing mechanism 60.

[0070] like Figure 1 and Figure 3 As shown, the air conditioning heat pump system also includes a liquid storage device 210, and the liquid storage device 210 includes a nineteenth port 211 and a twentieth port 212. The nineteenth port 211 is connected to the eighteenth port 202, and the twentieth port 212 is connected to the fifth port 51 through a pipe via the first reversing mechanism 60. The liquid storage device 210 can stabilize the refrigerant flow in the air conditioning heat pump system, prevent large fluctuations in the refrigerant flow, ensure that the system can quickly and stably enter the working state, and ensure the reliability of the system operation. In addition, the liquid storage device 210 also helps to optimize the heat transfer process of the system. The stable refrigerant flow can make the refrigerant in the indoor heat exchanger 50 and the outdoor heat exchanger 30 more evenly distributed, improve the heat transfer efficiency, and thus improve the cooling or heating performance of the system.

[0071] Furthermore, the air conditioning heat pump system also includes a gas separation device 220, which includes a twenty-first port 221 and a twenty-second port 222. Pipes connect the twenty-first port 221 to the fourth valve port 24 or the eighth valve port 92, and the twenty-second port 222 to the return air port 12. During operation of the air conditioning heat pump system, the refrigerant absorbs heat and evaporates from the outdoor heat exchanger 30 or the indoor heat exchanger 50, typically flowing out in a gas-liquid mixed state. The gas separation device 220 effectively separates the gaseous refrigerant from the liquid refrigerant, preventing the liquid refrigerant from entering the compressor 10 and preventing liquid hammer, thereby protecting the safe operation of the compressor 10 and extending its service life. Furthermore, the separated liquid refrigerant has a lower temperature and can be further cooled in the gas separation device 220 before entering the indoor heat exchanger 50 or the outdoor heat exchanger 30, thereby enhancing the cooling or heating effect of the indoor heat exchanger 50 or the outdoor heat exchanger 30. The gaseous refrigerant can enter the compressor 10 more purely, making the compression process of the compressor 10 closer to the ideal state, improving the compression efficiency, and thus improving the cooling or heating capacity of the entire system and optimizing the energy efficiency ratio of the system.

[0072] Combine Figures 1 to 3 as well as Figure 10 As shown, the air conditioning heat pump system also includes a pressure relief branch, which includes a fourth control valve 230 and a fourth throttling device 240. The fourth control valve 230 includes an eleventh valve port 231 and a twelfth valve port 232. The fourth throttling device 240 includes a twenty-third port 241 and a twenty-fourth port 242. The eleventh valve port 231 is connected to the pipeline between the fourth valve port 24 and the twenty-first port 221 via a pipe. Pipes connect the twelfth valve port 232 to the twenty-third port 241, and the twenty-fourth port 242 to the exhaust port 11. Optionally, the fourth control valve 230 is a bypass valve. The provision of such a bypass valve can optimize system performance, maintain stable pressure, and improve energy efficiency. It can also enhance system stability and flexibility, adapt to changing operating conditions, and reduce downtime. The fourth throttling device 240 can be a throttling element such as a capillary tube. The capillary tube can reduce the pressure of the refrigerant drawn from the high-pressure end to a level suitable for return flow to the low-pressure end, thereby preventing system shock caused by excessive pressure differences during the pressure relief process. The capillary tube can also control the flow rate to ensure stable operation of the system.

[0073] Specifically, providing a pressure relief branch in the air conditioning heat pump system can prevent excessive pressure and avoid damage to key components such as the compressor 10, the outdoor heat exchanger 30, and the indoor heat exchanger 50. The existence of the pressure relief branch can open the fourth control valve 230 when the system pressure exceeds the safety range, allowing part of the refrigerant to flow back to the return air port 12 of the compressor 10 through the fourth throttling device 240, thereby reducing the system pressure and protecting the system components from high-pressure damage. In some air conditioning heat pump systems, when the system pressure is too high, the compressor 10 will be shut down and restarted after a period of shutdown. Frequent start-stops will affect the performance and life of the compressor 10, as well as the stability of the air conditioning heat pump system. The pressure relief branch can release part of the pressure, so that the compressor 10 can avoid frequent start-stops, thereby improving the stability of the air conditioning heat pump system.

[0074] On the other hand, see Figures 1 to 10 As shown, the present application also provides a control method for an air-conditioning heat pump system, which is used to control the above-mentioned air-conditioning heat pump system.

[0075] Specifically, the air conditioning heat pump system in this embodiment has a hot water defrosting mode, a cooling mode, a heating mode, a cooling + partial heat recovery mode, a heating + domestic hot water mode, and a domestic hot water mode.

[0076] In actual use, by controlling the four-way valve 20, the first reversing mechanism 60 and the control component, the air-conditioning heat pump system can be switched between at least any two modes of hot water defrosting mode, cooling mode, heating mode, cooling + partial heat recovery mode, heating + domestic hot water mode and domestic hot water mode.

[0077] See also Figure 4 As shown, when the air conditioning heat pump system needs to be switched to the hot water defrost mode, it is only necessary to control the first control valve 80 and the second control valve 90 to open, control the first valve port 21 and the second valve port 22 of the four-way valve 20 to be conductive, and make the thirteenth valve port 61 and the fourteenth valve port 62 of the first reversing mechanism 60 conductive, control all other valves in the air conditioning heat pump system to be closed, and make the refrigerant of the air conditioning heat pump system flow along the first circulation loop. Among them, the refrigerant flow path in the first circulation loop is that the refrigerant flows through the exhaust port 11 of the compressor 10, the four-way valve 20, the outdoor heat exchanger 30, the first throttling device 40, the second throttling device 250, the first reversing mechanism 60, the domestic hot water heat exchanger 70 and the return air port 12 of the compressor 10 in sequence. Figure 4As shown, the high-temperature, high-pressure gaseous refrigerant discharged from the exhaust port 11 of the compressor 10 passes through the outdoor heat exchanger 30, where it condenses and releases heat to defrost, becoming a medium-temperature, medium-pressure liquid refrigerant. This liquid refrigerant then flows through the first throttling device 40, the economizer 170, and the second throttling device 250, becoming a low-temperature, low-pressure liquid refrigerant or a gas-liquid mixture. After passing through the first reversing mechanism 60 and the first control valve 80, it enters the domestic hot water heat exchanger 70, where it absorbs heat and evaporates, becoming a low-temperature, low-pressure gaseous refrigerant. This refrigerant then flows through the second control valve 90 and the gas separator 220, before returning to the compressor 10 through the return port 12, thus starting a new cycle. In this mode, the first pump 110 of the hot water tank 100 is turned on, allowing the hot water in the hot water tank 100 to enter the domestic hot water heat exchanger 70, transferring heat to the refrigerant.

[0078] See also Figure 5 As shown, when the air conditioning heat pump system needs to be switched to the cooling mode, it is only necessary to control the first valve port 21 and the second valve port 22 of the four-way valve 20 to be connected, the third valve port 23 and the fourth valve port 24 to be connected, control the thirteenth valve port 61 and the sixteenth valve port 64 of the first reversing mechanism 60 to be connected, and control all other valves in the air conditioning heat pump system to be closed so that the refrigerant of the air conditioning heat pump system flows along the second circulation loop. Among them, the refrigerant flow path in the second circulation loop is that the refrigerant flows through the exhaust port 11 of the compressor 10, the four-way valve 20, the outdoor heat exchanger 30, the first throttling device 40, the second throttling device 250, the indoor heat exchanger 50, the four-way valve 20, and the return air port 12 in sequence. Figure 5 As shown, the high-temperature and high-pressure gaseous refrigerant discharged from the exhaust port 11 of the compressor 10 passes through the outdoor heat exchanger 30 to condense and release heat for cooling, and becomes a medium-temperature and medium-pressure liquid refrigerant. The liquid refrigerant flows through the first throttling device 40, the economizer 170, and the second throttling device 250 in sequence and becomes a low-temperature and low-pressure liquid refrigerant or a gas-liquid mixed state, and then flows through the liquid storage device 210 and the first reversing mechanism 60 in sequence and enters the indoor heat exchanger 50. The refrigerant absorbs heat and evaporates in the indoor heat exchanger 50 to cool (at this time, the second pump body 160 at the end corresponding to the indoor heat exchanger 50 is turned on, and the air-conditioning water in the end is pumped into the indoor heat exchanger 50. The refrigerant exchanges heat with the air-conditioning water at the end of the indoor heat exchanger 50, and the air-conditioning water at the end becomes cold, realizing end cooling), and becomes a low-temperature and low-pressure gaseous refrigerant, and flows through the four-way valve 20 and the gas separation device 220 in sequence and flows back to the compressor 10 from the return air port 12 of the compressor 10 to start a new cycle. The high-temperature refrigerant condenses at the outdoor heat exchanger 30 to release heat, and then evaporates at the indoor heat exchanger 50 to absorb indoor heat to achieve a cooling effect.

[0079] See also Figure 6As shown, when the air conditioning heat pump system needs to be switched to the heating mode, it is only necessary to control the first valve port 21 and the third valve port 23 of the four-way valve 20 to be connected, the second valve port 22 and the fourth valve port 24 to be connected, the sixteenth valve port 64 and the thirteenth valve port 61 of the first reversing mechanism 60 to be connected, and all other valves in the air conditioning heat pump system to be closed, so that the refrigerant of the air conditioning heat pump system flows along the third circulation loop. Among them, the refrigerant flow path in the third circulation loop is that the refrigerant flows through the exhaust port 11 of the compressor 10, the indoor heat exchanger 50, the outdoor heat exchanger 30 and the return air port 12 in sequence. Figure 6 As shown, the high-temperature and high-pressure gaseous refrigerant discharged from the exhaust port 11 of the compressor 10 enters the indoor heat exchanger 50 through the four-way valve 20 for condensation and heat release to generate heat (at this time, the second pump body 160 at the end corresponding to the indoor heat exchanger 50 is opened, and the air-conditioning water in the end is pumped into the indoor heat exchanger 50, and the refrigerant exchanges heat with the air-conditioning water in the end, and the air-conditioning water in the end becomes hot, realizing end heating), and becomes a medium-temperature and medium-pressure liquid refrigerant. The liquid refrigerant flows through the first reversing mechanism 60, the liquid storage device 210, and the second throttling device 250 and becomes a low-temperature and low-pressure liquid refrigerant or a gas-liquid mixed state. The refrigerant enters the outdoor heat exchanger 30, and the refrigerant absorbs heat and evaporates in the outdoor heat exchanger 30, becoming a low-temperature and low-pressure gaseous refrigerant. After that, it flows through the four-way valve 20 and the gas separation device 220 and flows back to the compressor 10 from the return air port 12 of the compressor 10 to start a new cycle. The high-temperature refrigerant releases heat at the indoor heat exchanger 50 to achieve indoor heating effect.

[0080] See also Figure 7 As shown, when the air conditioning heat pump system needs to switch to the cooling + partial heat recovery mode, it is only necessary to control the second reversing mechanism 130 to be connected to the seventh port 71, control the third control valve 140 to open, the first valve port 21 and the second valve port 22, the third valve port 23 and the fourth valve port 24 of the four-way valve 20 to be connected, and make the thirteenth valve port 61 and the sixteenth valve port 64 of the first reversing mechanism 60 connected, control the other valves in the air conditioning heat pump system to be closed, and make the refrigerant of the air conditioning heat pump system flow along the fourth circulation loop. Among them, the refrigerant flow path in the fourth circulation loop is that the refrigerant flows through the exhaust port 11 of the compressor 10, the domestic hot water heat exchanger 70, the outdoor heat exchanger 30, the indoor heat exchanger 50 and the return air port 12 in sequence. As shown Figure 7As shown, the high-temperature and high-pressure gaseous refrigerant discharged from the exhaust port 11 of the compressor 10 enters the domestic hot water heat exchanger 70 through the second reversing mechanism 130 to be condensed and release heat so that the heat is partially recovered by the hot water (at this time, the first pump body 110 on the hot water tank 100 is turned on, so that the water in the hot water tank 100 circulates in the domestic hot water heat exchanger 70, and the refrigerant exchanges heat with the water in the hot water tank 100, and the water in the hot water tank 100 becomes hot), becoming a medium-temperature and medium-pressure gaseous refrigerant, and then flows through the third control valve 140 and the four-way valve 20 and enters the outdoor heat exchanger 30, becoming a medium-temperature and medium-pressure liquid refrigerant. The liquid refrigerant passes through the first throttling device 40, After passing through the economizer 170 and the second throttling device 250, the refrigerant is converted into a low-temperature, low-pressure liquid refrigerant or a gas-liquid mixture. It then flows through the liquid storage device 210 and the first reversing mechanism 60 and enters the indoor heat exchanger 50, where it absorbs heat and evaporates to cool the room. (At this point, the second pump body 160 at the corresponding terminal of the indoor heat exchanger 50 is turned on, pumping the air-conditioned water at the terminal into the indoor heat exchanger 50. The refrigerant exchanges heat with the air-conditioned water at the terminal, cooling the air-conditioned water at the terminal.) It then becomes a low-temperature, low-pressure gaseous refrigerant, which then flows through the four-way valve 20 and the gas separator 220 in sequence, returning to the compressor 10 from the return air port 12. This mode is equivalent to the refrigerant releasing sensible heat in the domestic hot water heat exchanger 70, then condensing and releasing latent heat in the outdoor heat exchanger 30, and then evaporating in the indoor heat exchanger 50 to absorb indoor heat to achieve a cooling effect.

[0081] See also Figure 8 As shown, when the air conditioning heat pump system needs to switch to the heating + domestic hot water mode, it is only necessary to control the second reversing mechanism 130 to be connected to the seventh port 71, control the third control valve 140 to be open, control the first valve port 21 of the four-way valve 20 to be connected to the third valve port 23, the second valve port 22 to be connected to the fourth valve port 24, and make the sixteenth valve port 64 of the first reversing mechanism 60 connected to the thirteenth valve port 61, control the other valves in the air conditioning heat pump system to be closed, and make the refrigerant of the air conditioning heat pump system flow along the fifth circulation loop. Among them, the refrigerant flow path in the fifth circulation loop is that the refrigerant flows through the exhaust port 11 of the compressor 10, the domestic hot water heat exchanger 70, the indoor heat exchanger 50, the outdoor heat exchanger 30 and the return air port 12 in sequence. As shown Figure 8As shown, the high-temperature and high-pressure gaseous refrigerant discharged from the exhaust port 11 of the compressor 10 enters the domestic hot water heat exchanger 70 through the second reversing mechanism 130 (at this time, the first pump body 110 on the hot water tank 100 is turned on, so that water circulates in the domestic hot water heat exchanger 70, and the refrigerant exchanges heat with the water in the hot water tank 100, and the water in the hot water tank 100 becomes hot), and becomes a medium-temperature and medium-pressure liquid refrigerant, and then flows through the third control valve 140 into the indoor heat exchanger 50, where the refrigerant absorbs heat and evaporates to cool the room (at this time, the indoor heat exchanger 50 is not heated). The second pump body 160 at the end is turned on, pumping air-conditioned water into the indoor heat exchanger 50. The refrigerant exchanges heat with the air-conditioned water, heating the water and turning it into a low-temperature, low-pressure gaseous refrigerant. It then flows through the first reversing mechanism 60, the liquid storage device 210, and is throttled by the second throttling device 250, the economizer 170, and the first throttling device 40 before entering the outdoor heat exchanger 30. It then turns into a low-temperature, low-pressure gaseous refrigerant or a gas-liquid mixture. After passing through the four-way valve 20 and the gas separator 220, it flows back into the compressor 10 from the return air port 12, starting a new cycle. Part of the heat of the high-temperature refrigerant is exchanged in the domestic hot water heat exchanger 70, and the remaining heat is released through the indoor heat exchanger 50 to achieve the indoor heating effect. The refrigerant evaporates in the outdoor heat exchanger 30, absorbing heat from the outdoor air.

[0082] See also Figure 9 As shown, when the air conditioning heat pump system needs to switch to the domestic hot water mode, it is only necessary to control the second reversing mechanism 130 to be connected to the seventh port 71, control the third control valve 140 to be open, control the first valve port 21 of the four-way valve 20 to be connected to the third valve port 23, the second valve port 22 to be connected to the fourth valve port 24, and make the sixteenth valve port 64 of the first reversing mechanism 60 connected to the thirteenth valve port 61, control the other valves in the air conditioning heat pump system to be closed, and make the refrigerant of the air conditioning heat pump system flow along the sixth circulation loop. Among them, the refrigerant flow path in the sixth circulation loop is that the refrigerant flows through the exhaust port 11 of the compressor 10, the domestic hot water heat exchanger 70, the indoor heat exchanger 50, the outdoor heat exchanger 30 and the return air port 12 in sequence. As shown Figure 9As shown, the high-temperature and high-pressure gaseous refrigerant discharged from the exhaust port 11 of the compressor 10 enters the domestic hot water heat exchanger 70 through the second reversing mechanism 130 (at this time, the first pump body 110 on the hot water tank 100 is turned on, so that water circulates in the domestic hot water heat exchanger 70, and the refrigerant exchanges heat with the water in the hot water tank 100, and the water in the hot water tank 100 becomes hot), becomes a medium-temperature and medium-pressure liquid refrigerant, and then flows through the third control valve 140 into the indoor heat exchanger 50 (at this time, the indoor heat exchanger 50 is not (The second pump body 160 at the end is not turned on, and the refrigerant flows through the indoor heat exchanger 50 without exchanging heat with the air-conditioning water.) The refrigerant then flows through the first reversing mechanism 60, the liquid storage device 210, the second throttling device 250, the economizer 170, and the first throttling device 40, and enters the outdoor heat exchanger 30, where it becomes a low-temperature, low-pressure liquid refrigerant or a gas-liquid mixture. After passing through the four-way valve 20 and the gas separator 220, it returns to the compressor 10 through the return air port 12, starting a new cycle. All the heat of the high-temperature refrigerant is exchanged in the domestic hot water heat exchanger 70 to produce hot water, and then evaporates in the outdoor heat exchanger 30, absorbing heat from the outdoor air.

[0083] In the above-mentioned hot water defrosting mode, cooling mode, heating mode, cooling + partial heat recovery mode, heating + domestic hot water mode, and domestic hot water mode, the first throttling device 40 and the second throttling device 250 can both be used as main throttling devices. When one is used as the main throttling device, the other is fully opened; or both are used as throttling devices at the same time for throttling.

[0084] In one embodiment, the first throttling device 40 performs throttling expansion in the hot water defrosting mode, the cooling mode, the heating mode, the cooling + partial heat recovery mode, the heating + domestic hot water mode, and the domestic hot water mode.

[0085] In one embodiment, in hot water defrost mode, cooling mode, and cooling + partial heat recovery mode, the first throttling device 40 serves as the main throttling device, and the second throttling device 250 is fully open. In heating mode, heating + domestic hot water mode, and domestic hot water mode, the second throttling device 250 serves as the main throttling device, and the first throttling device 40 is fully open. With this arrangement, in hot water defrost mode, cooling mode, cooling + partial heat recovery mode, the refrigerant flow direction is opposite to that in heating mode, heating + domestic hot water mode, and domestic hot water mode, and the high-pressure and low-pressure sides of the system also change accordingly. Using different throttling devices as the main control valve can more accurately match the refrigerant flow, pressure, and superheat control requirements of the current operating mode, thereby improving system efficiency. Furthermore, this arrangement can optimize the refrigerant circulation process, reduce energy loss, and improve heating or cooling efficiency.

[0086] It can be seen from the above embodiments that the air conditioning heat pump system and control method thereof of the present application have at least the following technical effects:

[0087] By setting a first reversing mechanism, a first control valve and a second control valve, the present application enables the air-conditioning heat pump system to achieve defrost during operation without changing the indoor state, thereby improving the user experience.

[0088] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0089] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0090] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of the present invention.

Claims

1. An air conditioning heat pump system, comprising: A refrigerant circulation main circuit, the refrigerant circulation main circuit comprising a compressor (10), a four-way valve (20), an outdoor heat exchanger (30), a first throttling device (40) and an indoor heat exchanger (50), the compressor (10) comprising an exhaust port (11) and an air return port (12), the outdoor heat exchanger (30) comprising a first port (31) and a second port (32), the first throttling device (40) comprising a third port (41) and a fourth port (42), the indoor heat exchanger (50) comprising a fifth port (51) and a sixth port (52), the four The through valve (20) comprises a first valve port (21), a second valve port (22), a third valve port (23) and a fourth valve port (24); the exhaust port (11) and the first valve port (21), the second valve port (22) and the first port (31), the second port (32) and the third port (41), the fourth port (42) and the fifth port (51), the sixth port (52) and the third valve port (23), and the fourth valve port (24) and the return air port (12) are all connected via pipelines; The air conditioning heat pump system further comprises a first reversing mechanism (60) and a domestic hot water heat exchanger (70), wherein the domestic hot water heat exchanger (70) comprises a seventh port (71) and an eighth port (72), wherein the fourth port (42) is connected to the seventh port (71) through a pipeline via the first reversing mechanism (60), the fourth port (42) is connected to the fifth port (51) through a pipeline via the first reversing mechanism (60), and the eighth port (72) is connected to the return air port (12) through a pipeline; A control assembly, the control assembly comprising a first control valve (80) and a second control valve (90), the first control valve (80) comprising a fifth valve port (81) and a sixth valve port (82), the fifth valve port (81) and the first reversing mechanism (60), and the sixth valve port (82) and the seventh port (71) being connected via a pipeline, the second control valve (90) comprising a seventh valve port (91) and an eighth valve port (92), the seventh valve port (91) and the eighth port (72), and the eighth valve port (92) being connected to a pipeline between the fourth valve port (24) and the return air port (12) via a pipeline; The air conditioning heat pump system includes a hot water defrosting mode, a cooling mode, and a heating mode, and the air conditioning heat pump system is switched between at least any two of the hot water defrosting mode, the cooling mode, and the heating mode by controlling the four-way valve (20), the first reversing mechanism (60), and the control component.

2. The air conditioning heat pump system according to claim 1, characterized in that: The air conditioning heat pump system further comprises a hot water tank (100), the hot water tank (100) comprising a liquid inlet (101) and a liquid outlet (102), the domestic hot water heat exchanger (70) comprising a water inlet (73) and a water outlet (74), the liquid outlet (102) and the water inlet (73), as well as the water outlet (74) and the liquid inlet (101), being connected via pipes.

3. The air conditioning heat pump system according to claim 1, characterized in that: The control assembly further comprises a second reversing mechanism (130) and a third control valve (140); the exhaust port (11) is communicated with the first valve port (21) via a pipeline through the second reversing mechanism (130), and / or the exhaust port (11) is communicated with the seventh port (71) via a pipeline through the second reversing mechanism (130); the third control valve (140) comprises a ninth valve port (141) and a tenth valve port (142); the ninth valve port (141) is communicated with the eighth port (72) via a pipeline, and the tenth valve port (142) is communicated with the pipeline between the second reversing mechanism (130) and the first valve port (21) via a pipeline; The air conditioning heat pump system further includes a cooling + partial heat recovery mode, a heating + domestic hot water mode, and a domestic hot water mode, and the air conditioning heat pump system is switched between at least any two of the hot water defrosting mode, the cooling mode, the heating mode, the cooling + partial heat recovery mode, the heating + domestic hot water mode, and the domestic hot water mode by controlling the four-way valve (20), the first reversing mechanism (60), and the control component.

4. The air conditioning heat pump system according to claim 3, characterized in that: The first control valve (80) and the third control valve (140) are both one-way valves, wherein the first control valve (80) is connected along the first reversing mechanism (60) to the seventh port (71), and the third control valve (140) is connected along the eighth port (72) to the pipeline between the second reversing mechanism (130) and the first valve port (21), and the second control valve (90) is a two-way valve.

5. The air conditioning heat pump system according to claim 1, characterized in that: The air conditioning heat pump system further comprises a second throttling device (250), the second throttling device (250) comprising a first connecting port (251) and a second connecting port (252), the first connecting port (251) and the fourth port (42), and the second connecting port (252) and the first reversing mechanism (60) are both connected via pipelines, wherein when the air conditioning heat pump system is in the cooling mode, the first throttling device (40) is a main control valve, and when the air conditioning heat pump system is in the heating mode, the second throttling device (250) is a main control valve.

6. The air conditioning heat pump system according to claim 5, characterized in that: The compressor (10) further includes an air supply port (13); and / or, The air conditioning heat pump system further includes an economizer (170) and a third throttling device (180). The economizer (170) includes a ninth port (171), a tenth port (172), an eleventh port (173), and a twelfth port (174). The third throttling device (180) includes a thirteenth port (181) and a fourteenth port (182). The ninth port (171) and the fourth port (42), the tenth port (172) and the fourteenth port (182), the eleventh port (173) and the air supply port (13), and the twelfth port (174) and the first connecting port (251) are all in communication via pipelines. The thirteenth port (181) is connected to the pipeline between the twelfth port (174) and the first connecting port (251) via a pipeline.

7. The air conditioning heat pump system according to claim 5, characterized in that: The air conditioning heat pump system further comprises a first filter (190) and a second filter (200), wherein the first filter (190) comprises a fifteenth port (191) and a sixteenth port (192), wherein the fifteenth port (191) and the second port (32), and the sixteenth port (192) and the third port (41) are both communicated through a pipeline, and the second filter (200) comprises a seventeenth port (201) and an eighteenth port (202), wherein the seventeenth port (201) and the second connecting port (252), and the eighteenth port (202) are communicated through a pipeline with the fifth port (51) via the first reversing mechanism (60).

8. The air conditioning heat pump system according to claim 7, characterized in that: The air conditioning heat pump system further comprises a liquid storage device (210), the liquid storage device (210) comprising a nineteenth port (211) and a twentieth port (212), the nineteenth port (211) and the eighteenth port (202), and the twenty-first port (212) and the fifth port (51) are in communication via a pipeline via the first reversing mechanism (60); and / or, The air conditioning heat pump system further comprises an air separation device (220), the air separation device (220) comprising a twenty-first port (221) and a twenty-second port (222), the twenty-first port (221) and the fourth valve port (24) or the eighth valve port (92), and the twenty-second port (222) and the return air port (12) are both communicated via pipelines.

9. The air conditioning heat pump system according to claim 8, characterized in that: The air conditioning heat pump system further comprises a pressure relief branch, the pressure relief branch comprising a fourth control valve (230) and a fourth throttling device (240), the fourth control valve (230) comprising an eleventh valve port (231) and a twelfth valve port (232), the fourth throttling device (240) comprising a twenty-third port (241) and a twenty-fourth port (242), the eleventh valve port (231) being connected to a pipeline between the fourth valve port (24) and the twenty-first port (221) through a pipeline, the twelfth valve port (232) and the twenty-third port (241), and the twenty-fourth port (242) and the exhaust port (11) being communicated through pipelines.

10. A control method for an air conditioning heat pump system, characterized in that: The control method is used to control the air conditioning heat pump system according to any one of claims 1 to 9; The four-way valve (20), the first reversing mechanism (60) and the control component are controlled to make the refrigerant of the air-conditioning heat pump system flow along the first circulation loop, wherein the refrigerant flow path in the first circulation loop is that the refrigerant flows through the exhaust port (11) of the compressor (10), the outdoor heat exchanger (30), the first throttling device (40), the domestic hot water heat exchanger (70) and the return air port (12) of the compressor (10) in sequence, at which time the air-conditioning heat pump system is in a hot water defrosting mode; or, The four-way valve (20), the first reversing mechanism (60) and the control component are controlled to make the refrigerant of the air-conditioning heat pump system flow along the second circulation loop, wherein the refrigerant flow path in the second circulation loop is that the refrigerant flows through the exhaust port (11) of the compressor (10), the outdoor heat exchanger (30), the first throttling device (40), the indoor heat exchanger (50) and the return air port (12) in sequence, at which time the air-conditioning heat pump system is in cooling mode; or, The four-way valve (20), the first reversing mechanism (60) and the control component are controlled to make the refrigerant of the air-conditioning heat pump system flow along the third circulation loop, wherein the refrigerant flow path in the third circulation loop is that the refrigerant flows through the exhaust port (11) of the compressor (10), the indoor heat exchanger (50), the first throttling device (40), the outdoor heat exchanger (30) and the return air port (12) in sequence, at which time the air-conditioning heat pump system is in heating mode; or, The four-way valve (20), the first reversing mechanism (60) and the control component are controlled so that the refrigerant of the air-conditioning heat pump system flows along a fourth circulation loop, wherein the refrigerant flow path in the fourth circulation loop is that the refrigerant flows sequentially through the exhaust port (11) of the compressor (10), the domestic hot water heat exchanger (70), the outdoor heat exchanger (30), the first throttling device (40), the indoor heat exchanger (50) and the return air port (12). At this time, the air-conditioning heat pump system is in a cooling + partial heat recovery mode; or, The four-way valve (20), the first reversing mechanism (60) and the control component are controlled so that the refrigerant of the air-conditioning heat pump system flows along a fifth circulation loop, wherein the refrigerant flow path in the fifth circulation loop is such that the refrigerant flows sequentially through the exhaust port (11) of the compressor (10), the domestic hot water heat exchanger (70), the indoor heat exchanger (50), the first throttling device (40), the outdoor heat exchanger (30) and the return air port (12). At this time, the air-conditioning heat pump system is in a heating + domestic hot water mode; or, The four-way valve (20), the first reversing mechanism (60) and the control component are controlled so that the refrigerant of the air-conditioning heat pump system flows along the sixth circulation loop, wherein the refrigerant flow path in the sixth circulation loop is that the refrigerant flows in sequence through the exhaust port (11) of the compressor (10), the domestic hot water heat exchanger (70), the indoor heat exchanger (50), the first throttling device (40), the outdoor heat exchanger (30) and the return air port (12). At this time, the air-conditioning heat pump system is in the domestic hot water production mode.

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