An air-conditioning water heater and its control method

Abstract

This invention provides an air-conditioning water heater and its control method. The air-conditioning water heater includes a compressor, an outdoor heat exchanger, an indoor heat exchanger, a water tank, and a liquid storage device. The discharge end of the compressor can be connected to one end of the outdoor heat exchanger, one end of the indoor heat exchanger, or one end of the water tank. The other end of the outdoor heat exchanger is connected to the interior of the liquid storage device, the other end of the indoor heat exchanger is connected to the interior of the liquid storage device, and the other end of the water tank is connected to the interior of the liquid storage device. The suction end of the compressor can be connected to one end of the outdoor heat exchanger, one end of the indoor heat exchanger, or one end of the water tank. According to this invention, it can simultaneously achieve cooling + hot water production and heating + hot water production modes, and can also adaptively adjust the refrigerant circulation volume in different modes, solving the problems of high power consumption and insufficient comfort requirements, thus achieving efficient system operation.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, specifically to an air-conditioning water heater and its control method. Background Technology

[0002] With the increasing popularity of household inverter air conditioners, air conditioner power consumption is increasing. Driven by the current national dual-carbon goals, higher requirements are being placed on the energy efficiency of air conditioners and the overall utilization efficiency of air conditioning equipment.

[0003] Conventional household inverter air conditioners typically release condensation heat directly into the air, which not only wastes energy but also raises the ambient temperature, leading to thermal pollution of the surrounding environment.

[0004] Air source heat pump water heaters have many advantages such as energy saving, environmental protection, and safety, but their cost and large installation size have limited their further promotion and use.

[0005] However, existing household inverter air conditioners cannot simultaneously achieve cooling + hot water production or heating + hot water production modes, nor can they adjust the required refrigerant charge amount according to the refrigerant circulation volume required for different modes. This results in high power consumption or failure to meet comfort requirements, and the air conditioner cannot operate efficiently. Therefore, this invention researches and designs an air conditioner water heater and its control method. Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defects of existing household inverter air conditioners that cannot simultaneously achieve cooling + hot water production or heating + hot water production modes, and cannot adjust the required refrigerant charge according to the refrigerant circulation volume required for different modes, resulting in high power consumption or failure to meet the comfort requirements, thereby providing an air conditioner water heater and its control method.

[0007] To address the above problems, the present invention provides an air-conditioning water heater, comprising:

[0008] The system includes a compressor, an outdoor heat exchanger, an indoor heat exchanger, a water tank, and a liquid storage device. The discharge end of the compressor can be connected to one end of the outdoor heat exchanger, one end of the indoor heat exchanger, or one end of the water tank. The other end of the outdoor heat exchanger is connected to the interior of the liquid storage device. The other end of the indoor heat exchanger is connected to the interior of the liquid storage device. The other end of the water tank is connected to the interior of the liquid storage device. The suction end of the compressor can be connected to one end of the outdoor heat exchanger, one end of the indoor heat exchanger, or one end of the water tank.

[0009] In some implementations...

[0010] It also includes a four-way valve, which comprises a first D-end, a first E-end, a first S-end, and a first C-end. The four-way valve can switch between two connection states: In the first state, the first D-end is connected to the first C-end, and simultaneously the first E-end is connected to the first S-end; in the second state, the first D-end is connected to the first E-end, and simultaneously the first C-end is connected to the first S-end.

[0011] The first D end is connected to the discharge end of the compressor through a first pipeline, the first E end is connected to one end of the indoor heat exchanger through a second pipeline, the first S end is connected to the suction end of the compressor through a third pipeline, and the first C end is connected to one end of the outdoor heat exchanger through a fourth pipeline.

[0012] In some implementations...

[0013] The other end of the outdoor heat exchanger is connected to the interior of the liquid storage device through the fifth pipe, the other end of the indoor heat exchanger is connected to the interior of the liquid storage device through the sixth pipe, and the other end of the water tank is connected to the interior of the liquid storage device through the seventh pipe.

[0014] In some implementations...

[0015] The fifth pipeline is equipped with a first throttling device, the sixth pipeline is equipped with a second throttling device, and the seventh pipeline is equipped with a third throttling device.

[0016] In some implementations...

[0017] The fifth pipe connects to the inside of the liquid storage device at one end, which is the first end. The first end is higher than the inner bottom surface of the liquid storage device by a first height. The sixth pipe connects to the inside of the liquid storage device at one end, which is the second end. The second end is higher than the inner bottom surface of the liquid storage device by a second height. The seventh pipe connects to the inside of the liquid storage device at one end, which is the third end. The third end is higher than the inner bottom surface of the liquid storage device by a third height. The distance between the first end and the top of the liquid storage device is a fourth height, and the fourth height is greater than the first height. The distance between the second end and the top of the liquid storage device is a fifth height, and the fifth height is greater than the second height. The distance between the third end and the top of the liquid storage device is a sixth height, and the sixth height is greater than the third height.

[0018] In some implementations...

[0019] The liquid storage device has a middle height dividing line at half its height. The distance from the first end to the middle height dividing line is the seventh height, and the seventh height is greater than the first height. The distance from the second end to the middle height dividing line is the eighth height, and the eighth height is greater than the second height. The distance from the third end to the middle height dividing line is the ninth height, and the ninth height is greater than the third height.

[0020] In some implementations...

[0021] It also includes a three-way valve, which comprises a second D-end, a second S-end, and a second C-end. The three-way valve can switch between two connection states: in the first state, the second D-end and the second C-end are connected, while the second S-end is blocked; in the second state, the second D-end is blocked, while the second C-end and the second S-end are connected.

[0022] The second D end is connected to the discharge end of the compressor through the eighth pipe, the second S end is connected to the suction end of the compressor through the ninth pipe, and the second C end is connected to one end of the water tank through the tenth pipe.

[0023] The tenth pipeline contacts the water tank through a refrigerant pipeline and exchanges heat with the water in the water tank. One end of the water tank is one end of the refrigerant pipeline, and the other end of the water tank is the other end of the refrigerant pipeline. The other end of the refrigerant pipeline is connected to the seventh pipeline. The refrigerant pipeline forms at least a part of the structure of the water tank heat exchanger.

[0024] It also includes an indoor fan and an outdoor fan, wherein the outdoor fan is opposite to the outdoor heat exchanger so as to drive airflow to exchange heat with the refrigerant in the outdoor heat exchanger.

[0025] The present invention also provides a control method for an air-conditioning water heater as described above, wherein: when the air-conditioning water heater simultaneously includes a four-way valve, a three-way valve, a first throttling device, a second throttling device, and a third throttling device, the control method includes:

[0026] Testing steps, and the required operating modes of the testing system;

[0027] The judgment step is to determine which of the following operating modes is required: cooling mode, heating mode, cooling + hot water mode, heating + hot water mode, hot water mode, and defrosting mode;

[0028] The control steps involve controlling the switching between the four-way valve and the three-way valve, as well as controlling the on / off state of the first throttling device, the second throttling device, and the third throttling device, and adjusting the opening degree, according to the requirements of different operating modes.

[0029] In some implementations...

[0030] The control steps include, when the required operating mode of the system is cooling mode, controlling the four-way valve to connect the first D end with the first C end, and simultaneously connecting the first E end with the first S end, and controlling the third throttling device to close, controlling the first throttling device and the second throttling device to open and controlling the opening degree of both to change.

[0031] When the required operating mode of the system is heating mode, the four-way valve is controlled to connect the first D end with the first E end and the first C end with the first S end, and the third throttling device is controlled to close, while the first throttling device and the second throttling device are controlled to open and their opening degrees are controlled to change.

[0032] When the required operating mode of the system is cooling mode + hot water production, the four-way valve is controlled to connect the first D end with the first C end and the first E end with the first S end. The three-way valve is controlled to connect the second D end with the second C end and the second S end is blocked. The first throttling device is controlled to close, and the third throttling device and the second throttling device are controlled to open and their opening degrees are controlled to change.

[0033] When the required operating mode of the system is heating mode + hot water production, the four-way valve is controlled to connect the first D end with the first E end and the first C end with the first S end. The three-way valve is controlled to connect the second D end with the second C end and the second S end is blocked. The first throttling device, the second throttling device and the third throttling device are controlled to open and the opening degree of the three is controlled to change.

[0034] In some implementations...

[0035] The judgment step, after determining that it is neither a cooling mode nor a heating mode, then determines whether it is a single hot water mode.

[0036] In the control steps, if it is a single hot water mode, control the four-way valve to connect the first D end with the first E end and the first C end with the first S end, control the three-way valve to connect the second D end with the second C end and the second S end to be blocked, control the second throttling device to close, control the first throttling device and the third throttling device to open and control the opening degree of the two to change.

[0037] The judgment step, after determining that it is neither a cooling mode, nor a heating mode, nor a single hot water mode, then determines whether it is a defrosting mode.

[0038] If the defrost mode is in use, the detection steps also include detecting the water temperature in the water tank;

[0039] When the water temperature is greater than or equal to the preset value, the system controls the execution of the heat storage defrosting operation mode, controls the four-way valve to connect the first D end with the first C end, and simultaneously connects the first E end with the first S end, controls the three-way valve to block the second D end, and simultaneously connects the second C end with the second S end, controls the second throttling device to close, controls the first throttling device and the third throttling device to open, and controls the opening degree of both to change.

[0040] When the water temperature is less than the preset value, the system controls the execution of the normal defrosting mode, controls the four-way valve to connect the first D end with the first C end, and simultaneously connects the first E end with the first S end, controls the three-way valve to connect the second D end with the second C end, and simultaneously blocks the second S end, controls the third throttling device to close, controls the first throttling device and the second throttling device to open, and controls the opening degree of both to change.

[0041] In the judgment step, if it is determined that the mode is neither cooling mode, nor heating mode, nor hot water mode, nor defrosting mode, the control step controls the air conditioner water heater to stop.

[0042] The air-conditioning water heater and its control method provided by this invention have the following beneficial effects:

[0043] This invention, by incorporating a compressor, outdoor heat exchanger, indoor heat exchanger, water tank, and liquid storage device, and using the specific connection method described above, integrates the water tank into a conventional air conditioning system, organically combining a heat pump water heater and an air conditioning system. It enables multiple operating modes, including cooling, heating, hot water supply, simultaneous cooling and hot water supply, simultaneous heating and hot water supply, heat storage defrosting, and conventional defrosting. Specifically, it can simultaneously achieve cooling + hot water production and heating + hot water production modes. By incorporating a liquid storage device and connecting the other ends of the outdoor heat exchanger, the indoor heat exchanger, and the water tank to the inside of the liquid storage device, the invention can adaptively adjust the refrigerant circulation volume entering the system. Since the refrigerant circulation volume differs under various operating modes, the liquid storage device... The aforementioned connection method can adapt to the refrigerant circulation volume in different modes, solving the problem of high power consumption caused by a small required refrigerant flow rate but a large actual circulation flow rate, and the problem of not meeting comfort requirements caused by a large required refrigerant flow rate but a small actual circulation flow rate, thus achieving efficient system operation. This invention allows for the sharing or partial sharing of the same heat exchanger and piping system in multiple operating modes. Compared to simultaneously installing an air conditioner and a heat pump water heater, this saves initial investment and operating costs, and improves the overall system efficiency. Furthermore, the air conditioning system of this invention can use the condensation heat generated by the refrigeration system to heat the hot water (refrigeration + hot water production mode) when operating simultaneously for cooling and hot water supply. This reduces the system's heat emissions into the environment, lowers thermal pollution, and improves system energy efficiency. Attached Figure Description

[0044] Figure 1 This is a system structure diagram of the air conditioner water heater of the present invention;

[0045] Figure 2 This is a flow path structure diagram of the air conditioner water heater of the present invention in the cooling & conventional defrosting mode;

[0046] Figure 3 This is a flow path structure diagram of the air conditioner water heater of the present invention in heating mode;

[0047] Figure 4 This is a flow path structure diagram of the air conditioner water heater of the present invention in single hot water mode;

[0048] Figure 5 This is a flow path structure diagram of the air conditioner water heater of the present invention in the cooling + hot water production mode;

[0049] Figure 6 This is a flow path structure diagram of the air conditioner water heater of the present invention in the heating + hot water mode;

[0050] Figure 7 This is a flow path structure diagram of the air conditioner water heater of the present invention in the heat storage defrosting mode;

[0051] Figure 8 This is a flowchart of the system control method for the air conditioner water heater of the present invention.

[0052] The reference numerals in the attached figures are as follows:

[0053] 1. Compressor; 21. Four-way valve; C, first C end; D, first D end; E, first E end; S, first S end; 22. Three-way valve; C', second C end; D', second D end; E', second E end; S', second S end; 3. Outdoor heat exchanger; 4. Indoor heat exchanger; 51. First throttling device; 52. Second throttling device; 53. Third throttling device; 6. Liquid storage device; 71. Outdoor fan; 72. Indoor fan; 8. Water tank; 81. Water tank inlet; 82. Water tank outlet; 83. Water tank heat exchanger; 101. First pipeline; 102. Second pipeline; 103. Third pipeline; 104. Fourth pipeline; 105. Fifth pipeline; 106. Sixth pipeline; 107. Seventh pipeline; 108. Eighth pipeline; 109. Ninth pipeline; 110. Tenth pipeline. Detailed Implementation

[0054] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0055] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0056] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0057] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0058] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0059] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0060] like Figure 1-8As shown, the present invention provides an air-conditioning water heater, which includes:

[0061] The system comprises a compressor 1, an outdoor heat exchanger 3, an indoor heat exchanger 4, a water tank 8, and a liquid storage device 6 (liquid storage tank). The discharge end of the compressor 1 can be connected to one end of the outdoor heat exchanger 3, one end of the indoor heat exchanger 4, or one end of the water tank 8. The other end of the outdoor heat exchanger 3 is connected to the interior of the liquid storage device 6. The other end of the indoor heat exchanger 4 is connected to the interior of the liquid storage device 6. The other end of the water tank 8 is connected to the interior of the liquid storage device 6. The suction end of the compressor 1 can be connected to one end of the outdoor heat exchanger 3, one end of the indoor heat exchanger 4, or one end of the water tank.

[0062] This invention, by incorporating a compressor, outdoor heat exchanger, indoor heat exchanger, water tank, and liquid storage device, and through the specific connection method described above, integrates the water tank into a conventional air conditioning system, organically combining a heat pump water heater and an air conditioning system. This allows for multiple operating modes, including cooling, heating, hot water supply, simultaneous cooling and hot water supply, simultaneous heating and hot water supply, heat storage defrosting, and conventional defrosting. In other words, it can simultaneously achieve cooling + hot water production and heating + hot water production modes. By incorporating a liquid storage device and connecting the other ends of the outdoor heat exchanger, the indoor heat exchanger, and the water tank to the inside of the liquid storage device, the invention can adaptively adjust the refrigerant circulation volume entering the system. Since the refrigerant circulation volume differs under various operating modes, the aforementioned connection method of the liquid storage device can adaptively adjust the refrigerant circulation volume under different modes, solving the problem of... This invention addresses the problem of high power consumption caused by a small required refrigerant flow rate but a large actual circulation flow rate, and also solves the problem of insufficient comfort levels due to a large required refrigerant flow rate but a small actual circulation flow rate, thus achieving efficient system operation. The invention allows for the sharing or partial sharing of the same heat exchanger and piping system across multiple operating modes. Compared to simultaneously installing an air conditioner and a heat pump water heater, this saves initial investment and operating costs, and improves the overall system efficiency. Furthermore, the air conditioning system of this invention can utilize the condensation heat generated by the refrigeration system to heat the hot water (refrigeration + hot water production mode) when operating simultaneously for cooling and hot water supply. This reduces heat emissions into the environment, lowers thermal pollution, and improves system energy efficiency. Additionally, the outdoor heat exchanger absorbs heat from the water in the tank during defrosting, which can be used for defrosting, shortening defrosting time, reducing indoor temperature fluctuations, and improving user comfort.

[0063] This invention can solve the following technical problems:

[0064] 1. The energy waste and environmental thermal pollution caused by air conditioners releasing heat outdoors during cooling operation;

[0065] 2. The simultaneous installation of air conditioners and heat pump water heaters results in higher installation and operating costs;

[0066] 3. Conventional air conditioners' reverse circulation defrosting method results in slow defrosting speed, large fluctuations in indoor temperature, and affects indoor comfort;

[0067] 4. The problem of refrigerant charge matching in multi-mode operation systems.

[0068] This invention proposes an air conditioning and hot water combined supply system that collects the condensation heat emitted into the environment during air conditioning operation and uses it to heat hot water or other heating equipment. It can realize multiple functions such as cooling, heating, and hot water supply, saving initial investment and operating costs of equipment, improving the overall efficiency of the system, and reducing the heat emitted into the environment, thus reducing thermal pollution.

[0069] In some implementations...

[0070] It also includes a four-way valve 21 (four-way directional valve), which includes a first D-end (D), a first E-end (E), a first S-end (S), and a first C-end (C). The four-way valve 21 can switch between the following two connection states: In the first state, the first D-end (D) is connected to the first C-end (C), and the first E-end (E) is connected to the first S-end (S); In the second state, the first D-end (D) is connected to the first E-end (E), and the first C-end (C) is connected to the first S-end (S).

[0071] The first D end D is connected to the exhaust end of the compressor 1 through the first pipe 101, the first E end E is connected to one end of the indoor heat exchanger 4 through the second pipe 102, the first S end S is connected to the suction end of the compressor 1 through the third pipe 103, and the first C end C is connected to one end of the outdoor heat exchanger 3 through the fourth pipe 104.

[0072] This is the preferred structural form of the present invention. The four-way valve can effectively switch modes, especially the connection position between the indoor heat exchanger and the outdoor heat exchanger, to achieve switching between cooling and heating, as well as switching between cooling + hot water and heating + hot water.

[0073] The air conditioner of the present invention also has a main four-way valve (four-way valve 21) for switching between different operating modes. The D pipe (first D end) of the four-way valve is connected to the exhaust port of the compressor 1, the S pipe (first S end) is connected to the suction port of the compressor, the E pipe (first E end) is connected to the indoor heat exchanger 4, and the C pipe (first C end) is connected to the outdoor heat exchanger 3.

[0074] In some implementations...

[0075] The other end of the outdoor heat exchanger 3 is connected to the interior of the liquid storage device 6 through the fifth pipe 105, the other end of the indoor heat exchanger 4 is connected to the interior of the liquid storage device 6 through the sixth pipe 106, and the other end of the water tank 8 is connected to the interior of the liquid storage device 6 through the seventh pipe 107.

[0076] In a further preferred embodiment, the other end of the outdoor heat exchanger is connected to the interior of the liquid storage device via a fifth pipe, the other end of the indoor heat exchanger is connected to the interior of the liquid storage device via a sixth pipe, and the other end of the water tank is connected to the interior of the liquid storage device via a seventh pipe. This allows the liquid storage device to transport different amounts of refrigerant liquid from its interior to the outdoor heat exchanger via the fifth pipe, to the indoor heat exchanger via the sixth pipe, and to the water tank via the seventh pipe, depending on the operating mode. By adjusting the liquid level in the liquid storage device, the refrigerant circulation volume can be adaptively adjusted for different modes. This solves the problem of high power consumption caused by a small required refrigerant flow rate but a large actual circulation flow rate, and also solves the problem of insufficient comfort levels caused by a large required refrigerant flow rate but a small actual circulation flow rate, thus achieving efficient system operation.

[0077] When the system requires a large amount of refrigerant to circulate, the liquid level in the receiver is adjusted to allow more refrigerant to be released into the circulation, causing the liquid level in the receiver to drop. When the system requires a small amount of refrigerant to circulate, the liquid level in the receiver is adjusted to allow less refrigerant to be released into the circulation, causing the liquid level in the receiver to rise.

[0078] In some implementations...

[0079] The fifth pipeline 105 is provided with a first throttling device 51, the sixth pipeline 106 is provided with a second throttling device 52, and the seventh pipeline 107 is provided with a third throttling device 53.

[0080] The present invention also utilizes a first throttling device on the fifth pipeline to regulate or shut off the refrigerant flow through or out of the outdoor heat exchanger, thereby effectively controlling the refrigerant flow through the outdoor heat exchanger; a second throttling device on the sixth pipeline to regulate or shut off the refrigerant flow through or out of the indoor heat exchanger, thereby effectively controlling the refrigerant flow through the indoor heat exchanger; and a third throttling device on the seventh pipeline to regulate or shut off the refrigerant flow through or out of the water tank, thereby effectively controlling the refrigerant flow through the water tank, to meet the refrigerant flow requirements of the indoor and outdoor heat exchangers and the water tank under different operating modes.

[0081] The water tank heat exchanger 83 in the air conditioning system water tank 8 of the present invention forms a series or parallel relationship with the outdoor heat exchanger 3 and the indoor heat exchanger 4 through different combinations of the four-way valve 21, the three-way valve 22 and the first throttling device 51, the second throttling device 52 and the third throttling device 53. It can realize multiple operating modes such as cooling, heating, hot water production, cooling + hot water production, heating + hot water production, heat storage defrosting and conventional defrosting to meet different user needs.

[0082] In the air conditioning system of the present invention, the first throttling device 51 is preferably connected in series between the outdoor heat exchanger 3 and the liquid storage device 6, the second throttling device 52 is preferably connected in series between the liquid storage device 6 and the indoor heat exchanger 4, and the third throttling device 53 is connected in series between the liquid storage device 6 and the water tank 8. The first throttling device 51, the second throttling device 52, and the third throttling device 53 are all valve-closed throttling devices with no flow. When the system needs to switch operating modes, closing this throttling device can cut off the refrigerant operation in this section of the pipeline.

[0083] The air conditioning hot water system of the present invention controls the switching of the first and three-way valves and the throttling device by detecting the activation status of the system operation mode, thereby activating different operation modes; and activates different defrosting operation modes (heat storage defrosting improves defrosting efficiency) by detecting the water temperature in the water tank and comparing it with the set temperature; the air conditioning hot water system of the present invention preferably uses environmentally friendly and efficient refrigerants such as R32 and R290.

[0084] In some implementations...

[0085] The fifth pipe 105 is connected to the interior of the liquid storage device 6 at one end, which is a first end. The first end is higher than the inner bottom surface of the liquid storage device 6 by a first height. The sixth pipe 106 is connected to the interior of the liquid storage device 6 at one end, which is a second end. The second end is higher than the inner bottom surface of the liquid storage device 6 by a second height. The seventh pipe 107 is connected to the interior of the liquid storage device 6 at one end, which is a third end. The third end is higher than the inner bottom surface of the liquid storage device 6 by a third height. The distance between the first end and the top of the liquid storage device 6 is a fourth height, and the fourth height is greater than the first height. The distance between the second end and the top of the liquid storage device 6 is a fifth height, and the fifth height is greater than the second height. The distance between the third end and the top of the liquid storage device 6 is a sixth height, and the sixth height is greater than the third height.

[0086] This is a further preferred structural form of the air-conditioning water heater of the present invention, namely, the insertion height of the fifth, sixth and seventh pipes into the liquid storage device is all located at the lower end, which can effectively draw refrigerant from the refrigerant liquid at the bottom of the liquid storage device and enter the corresponding heat exchanger for heat exchange. It can adaptively adjust the flow rate of refrigerant circulating in the system under different operating modes, solve the problem of high power consumption caused by small required refrigerant flow rate but large actual circulation flow rate, and solve the problem of not meeting the comfort requirements caused by large required refrigerant flow rate but small actual circulation flow rate, thus realizing the efficient operation of the system.

[0087] In some implementations...

[0088] The liquid storage device 6 has a middle height dividing line at half its height. The distance from the first end to the middle height dividing line is the seventh height, and the seventh height is greater than the first height. The distance from the second end to the middle height dividing line is the eighth height, and the eighth height is greater than the second height. The distance from the third end to the middle height dividing line is the ninth height, and the ninth height is greater than the third height.

[0089] This is a further preferred structural form of the air-conditioning water heater of the present invention, namely, the insertion height of the fifth, sixth and seventh pipes into the liquid storage device is all located at the lower end of the middle height dividing line, which can further draw refrigerant from the refrigerant liquid at the bottom of the liquid storage device and enter the corresponding heat exchanger for heat exchange. It can adaptively adjust the flow rate of refrigerant circulating in the system under different operating modes, solve the problem of high power consumption caused by small required refrigerant flow rate but large actual circulation flow rate, and solve the problem of not meeting the comfort requirements caused by large required refrigerant flow rate but small actual circulation flow rate, thus realizing the efficient operation of the system.

[0090] The air conditioner of the present invention also has a refrigerant charge adjustment device (i.e., a liquid storage device), which is connected to the first throttling device 51, the second throttling device 52 and the third throttling device 53 respectively, and the pipes connected to the charge adjustment device are all inserted near the bottom. When the refrigerant circulation demand in the system is high, the liquid storage device releases more refrigerant to participate in the circulation, and the liquid level in the liquid storage device drops; when the refrigerant circulation demand in the system is low, the refrigerant is stored in the liquid storage device and does not participate in the circulation, and the liquid level in the liquid storage device rises.

[0091] In some implementations...

[0092] It also includes a three-way valve 22, which includes a second D-end D', a second E-end E', a second S-end S', and a second C-end C'. The three-way valve 22 can switch between the following two connection states: In the first state, the second D-end D' is connected to the second C-end C', and the second E-end E' is connected to the second S-end S'; In the second state, the second D-end D' is connected to the second E-end E', and the second C-end C' is connected to the second S-end S'.

[0093] The second D end D' is connected to the discharge end of the compressor 1 through the eighth pipe 108, the second E end E' is blocked, the second S end S' can be connected to the suction end of the compressor 1 through the ninth pipe 109, and the second C end C' can be connected to one end of the water tank 8 through the tenth pipe 110.

[0094] The tenth pipe 110 contacts the water tank 8 through the refrigerant pipe and exchanges heat with the water in the water tank 8. One end of the water tank 8 is one end of the refrigerant pipe, and the other end of the water tank 8 is the other end of the refrigerant pipe. The other end of the refrigerant pipe is connected to the seventh pipe 107. The refrigerant pipe forms at least a part of the structure of the water tank heat exchanger 83.

[0095] It also includes an indoor fan 72 and an outdoor fan 71, wherein the outdoor fan 71 is opposite to the outdoor heat exchanger 3 so as to drive airflow to exchange heat with the refrigerant in the outdoor heat exchanger 3.

[0096] This invention connects one end of the water tank to the compressor's exhaust end via a tenth pipeline. When hot water is needed, adjusting the three-way valve connects the second C end and the second D end, and opening the third throttling device allows high-temperature, high-pressure refrigerant to enter the water tank to heat the water and produce hot water at the desired temperature. When defrosting is needed, adjusting the three-way valve connects the second C end and the second S end, and opening the third throttling device allows high-temperature, high-pressure refrigerant to enter the outdoor heat exchanger for defrosting. The cooled refrigerant after heat exchange then enters the water tank to absorb the stored heat, preventing a drop in indoor temperature and improving comfort.

[0097] The air conditioner of this invention also includes a main four-way reversing valve (four-way valve 21) and an auxiliary three-way valve (three-way valve 22) for switching between different operating modes. The main four-way reversing valve has its D-pipe connected to the exhaust port of the compressor 1, its S-pipe connected to the suction port of the compressor, its E-pipe connected to the indoor heat exchanger 4, and its C-pipe connected to the outdoor heat exchanger 3. The auxiliary three-way valve is preferably a four-way reversing valve with its E-pipe blocked.

[0098] like Figure 1 The air conditioning water heater system of the present invention shown includes a compressor 1, an outdoor heat exchanger 3, a first throttling device 51, a second throttling device 52, a third throttling device 53, an indoor heat exchanger 4, a water tank heat exchanger 83, a four-way valve 21, a three-way valve 22 (wherein the three-way valve can also be a four-way reversing valve with the E pipe welded to it), an outdoor fan 71, an indoor fan 72, a water tank 8, and a liquid storage device 6 for adjusting the refrigerant charge.

[0099] The compressor 1 of this invention has its exhaust port connected to the D pipe of the four-way valve 21 and the D pipe of the three-way valve 22, respectively, and its suction port connected to the S pipe of the four-way valve 21 and the three-way valve 22, respectively. The C pipe of the four-way valve 21 is connected to one end of the outdoor heat exchanger, and the other end of the outdoor heat exchanger is connected to the first throttling device 51. The liquid storage device 6, used to regulate the refrigerant charge, has three connecting pipe interfaces that are respectively connected to the three throttling devices, wherein the three connecting pipes of the liquid storage tank are respectively inserted into the bottom of the liquid storage tank. The indoor heat exchanger 4 is connected to the second throttling device 52 and the E pipe of the four-way valve, respectively. The other end of the water tank heat exchanger is connected to the third throttling device 53. This invention can realize multiple operating modes such as independent cooling, heating, hot water production, cooling + hot water production, heating + hot water production, heat storage defrosting, and conventional defrosting by controlling the throttling devices, the four-way valve, and the three-way valve.

[0100] The present invention also provides a control method for an air-conditioning water heater as described above, wherein:

[0101] When the air conditioner water heater simultaneously includes a four-way valve 21, a three-way valve 22, a first throttling device 51, a second throttling device 52, and a third throttling device 53, the control method includes:

[0102] Testing steps, and the required operating modes of the testing system;

[0103] The judgment step is to determine which of the following operating modes is required: cooling mode, heating mode, cooling + hot water mode, heating + hot water mode, hot water mode, and defrosting mode;

[0104] The control steps involve controlling the switching of the four-way valve 21 and the three-way valve 22 according to the needs of different operating modes, as well as controlling the opening and closing of the first throttling device 51, the second throttling device 52 and the third throttling device 53 and adjusting the opening size.

[0105] This invention integrates a water tank into a conventional air conditioning system, organically combining a heat pump water heater and an air conditioning system. It controls the switching of two four-way valves and the opening and closing of three throttling devices according to the needs of different operating modes. This allows for multiple operating modes, including cooling, heating, hot water supply, simultaneous cooling and hot water supply, simultaneous heating and hot water supply, heat storage defrosting, and conventional defrosting. In other words, it can simultaneously achieve cooling + hot water production and heating + hot water production modes. By setting up a liquid storage device and connecting the other end of the outdoor heat exchanger, the other end of the indoor heat exchanger, and the other end of the water tank to the inside of the liquid storage device, the invention can adaptively adjust the refrigerant circulation volume entering the system. Since the refrigerant circulation volume differs under various operating modes, the liquid storage device... The aforementioned connection method can adapt to the refrigerant circulation volume under different modes, solving the problem of high power consumption caused by a small required refrigerant flow rate but a large actual circulation flow rate, and the problem of not meeting comfort requirements caused by a large required refrigerant flow rate but a small actual circulation flow rate, thus achieving efficient system operation. This invention allows for the sharing or partial sharing of the same heat exchanger and piping system across multiple operating modes. Compared to simultaneously installing an air conditioner and a heat pump water heater, this saves initial investment and operating costs, and improves the overall system efficiency. Furthermore, the air conditioning system of this invention can use the condensation heat generated by the refrigeration system to heat the hot water (refrigeration + hot water production mode) when operating simultaneously for cooling and hot water supply. This reduces the system's heat emissions into the environment, lowers thermal pollution, and improves system energy efficiency.

[0106] In some implementations...

[0107] In the control steps, when the required operating mode of the system is the cooling mode, the four-way valve 21 is controlled to connect the first D end D with the first C end C, and at the same time, the first E end E is connected with the first S end S. The third throttling device 53 is controlled to close, and the first throttling device 51 and the second throttling device 52 are controlled to open and their opening degrees are controlled to change.

[0108] When the required operating mode of the system is heating mode, the four-way valve 21 is controlled to connect the first D end D with the first E end E, and at the same time, the first C end C with the first S end S. The third throttling device 53 is controlled to close, and the first throttling device 51 and the second throttling device 52 are controlled to open and their opening degrees are controlled to change.

[0109] When the required operating mode of the system is cooling mode + hot water production, the four-way valve 21 is controlled to connect the first D end D with the first C end C, and at the same time, the first E end E with the first S end S, and the first throttling device 51 is controlled to close. The three-way valve 22 is controlled to connect the second D end D' with the second C end C', and at the same time, the second S end S' is blocked. The third throttling device 53 and the second throttling device 52 are controlled to open and their opening degrees are controlled to change.

[0110] When the required operating mode of the system is heating mode + hot water production, the four-way valve 21 is controlled to connect the first D end D with the first E end E, and at the same time, the first C end C with the first S end S. The three-way valve 22 is controlled to connect the second D end D' with the second C end C', and at the same time, the second S end S' is blocked. The first throttling device 51, the second throttling device 52 and the third throttling device 53 are controlled to open and the opening degree of the three is controlled to change.

[0111] like Figure 2 As shown, during cooling mode operation, both the four-way valve 21 and the three-way valve 22 are de-energized, while pipes D and C are open, and pipes S and E are open. The third throttling device 53 is closed. The high-temperature, high-pressure refrigerant gas discharged from the compressor enters the outdoor heat exchanger 3 through pipes D and C of the four-way valve 21. In the outdoor heat exchanger 3, it is cooled and condensed into a high-pressure liquid refrigerant. Then, after partial throttling by the first throttling device 51, it enters the liquid storage device 6. The refrigerant in the liquid storage device is further throttled and depressurized by the second throttling device 52, becoming a low-temperature, low-pressure two-phase state before entering the indoor heat exchanger 4. In the indoor heat exchanger, it absorbs heat and vaporizes to cool the indoor air, thus meeting the cooling requirements. After heat exchange, the low-pressure refrigerant gas enters the compressor's suction port through pipes E and S of the four-way valve 21, where it is compressed into a high-temperature, high-pressure gas state in the compressor cylinder, thus completing the entire refrigeration cycle.

[0112] like Figure 3 As shown, during heating mode operation, the four-way valve 21 is energized, connecting pipes D and E, and pipes C and S; the three-way valve 22 is de-energized, connecting pipes D and C, and pipes S and E; the third throttling device 53 is closed. The high-temperature, high-pressure gaseous refrigerant discharged from compressor 1 enters the indoor heat exchanger 4 through pipes D and E of the four-way valve 21, condensing and releasing heat to become a high-pressure subcooled liquid. It then undergoes a first throttling and pressure reduction process through the second throttling device 52 before entering the liquid receiver 6. The refrigerant in the liquid receiver 6 undergoes further throttling and pressure reduction through the first throttling device 51 before entering the outdoor heat exchanger 3, where it evaporates and absorbs heat to become a low-pressure superheated gas. The gaseous refrigerant flowing out of the outdoor heat exchanger 3 enters the compressor suction port through pipes C and S of the four-way valve 21 and is compressed into a high-temperature, high-pressure gaseous state in the compressor cylinder before being discharged from the compressor exhaust port, thus completing the entire heating cycle.

[0113] like Figure 4As shown, during hot water production mode, the four-way valve 21 is energized, connecting pipes D and E, and pipes C and S; the three-way valve 22 is de-energized, connecting pipes D and C, and pipes S and E; the second throttling device 52 is closed. The high-temperature, high-pressure gaseous refrigerant discharged from the compressor enters the heat exchanger in the static water tank 8 through pipes D and C of the three-way valve 22, condensing and releasing heat to heat the water in the tank. The condensed, subcooled liquid refrigerant then enters the liquid storage device 6 through the third throttling device 53. The refrigerant in the liquid storage device 6, after being throttled and depressurized by the first throttling device 51, enters the outdoor heat exchanger 3. The low-temperature, low-pressure refrigerant absorbs heat and vaporizes in the outdoor heat exchanger 3, becoming a low-pressure superheated gas. It then enters the compressor's suction port through pipes C and S of the four-way valve 21. The refrigerant is compressed into a high-temperature, high-pressure state in the compressor cylinder and discharged through the compressor's exhaust port, thus completing the entire hot water production cycle.

[0114] like Figure 5 As shown, during the cooling + hot water mode operation, both the four-way valve 21 and the three-way valve 22 are de-energized, while pipes D and C are open, and pipes S and E are open. The first throttling device 51 is closed. The high-temperature, high-pressure gaseous refrigerant discharged from the compressor enters the heat exchanger in the static water tank 8 through pipes D and C of the three-way valve 22. This condenses and releases heat to heat the water in the tank. The refrigerant, now in a subcooled liquid state, enters the liquid storage device 6 through the third throttling device 53. The refrigerant in the liquid storage device 6 is then throttled and depressurized by the second throttling device 52 before entering the indoor heat exchanger 4. The low-temperature, low-pressure refrigerant absorbs heat and vaporizes in the indoor heat exchanger 4, becoming a low-pressure superheated gas. It then enters the compressor's suction port through pipes C and S of the four-way valve 21. The refrigerant is compressed into a high-temperature, high-pressure state in the compressor cylinder and discharged through the compressor's exhaust port, thus completing the entire cooling + hot water cycle.

[0115] like Figure 6As shown, during heating + hot water operation, the four-way valve 21 is energized, with pipes D and E connected, and pipes C and S connected; the three-way valve 22 is de-energized, with pipes D and C connected, and pipes E and S connected. The high-temperature, high-pressure gaseous refrigerant discharged from the compressor enters the four-way valve 21 and the three-way valve 22 in two separate paths. One path enters the water tank heat exchanger 83 of the static water tank 8 through pipes D and C of the three-way valve 22, where it releases heat and condenses before passing through the third throttling device 53 into the liquid storage device 6 to heat the water in the tank. The other path enters the indoor heat exchanger 4 through pipes D and E of the four-way valve 21, where it releases heat and condenses to heat the indoor air. The condensed refrigerant liquid then passes through the second throttling device 52 into the liquid storage device 6. The refrigerant in the liquid storage device 6 is throttled and depressurized by the first throttling device 51 and then enters the outdoor heat exchanger 3 to evaporate and absorb outdoor heat, becoming a low-pressure superheated gas. The low-pressure superheated gas exiting the outdoor heat exchanger 3 enters the compressor suction port through the E and S pipes of the four-way valve 21. The refrigerant is compressed into a high-temperature and high-pressure state in the compressor cylinder and then discharged through the compressor discharge port, thus completing the entire heating + hot water cycle.

[0116] The schematic diagrams for the standard defrosting operation mode and the cooling operation mode are the same, as follows: Figure 2 As shown.

[0117] Figure 8 This diagram illustrates the system control method. By detecting the activation status of the system's operating modes, the system controls the switching of the four-way valve and throttling device to activate different operating modes. The air conditioning water heater system of this invention uses environmentally friendly and efficient refrigerants such as R32 and R290.

[0118] In some implementations...

[0119] The judgment step, after determining that it is neither a cooling mode nor a heating mode, then determines whether it is a single hot water mode.

[0120] In the control steps, if it is a single hot water mode, the four-way valve 21 is controlled to connect the first D end D with the first E end E, and at the same time, the first C end C with the first S end S. The three-way valve 22 is controlled to connect the second D end D' with the second C end C', and at the same time, the second S end S' is blocked. The second throttling device 52 is controlled to close, and the first throttling device 51 and the third throttling device 53 are controlled to open and their opening degrees are controlled to change.

[0121] The judgment step, after determining that it is neither a cooling mode, nor a heating mode, nor a single hot water mode, then determines whether it is a defrosting mode.

[0122] If the defrost mode is in use, the detection steps also include detecting the water temperature in the water tank;

[0123] When the water temperature is greater than or equal to the preset value, the system controls the execution of the heat storage defrosting operation mode, controls the four-way valve 21 to connect the first D end D with the first C end C, and simultaneously connects the first E end E with the first S end S, controls the three-way valve 22 to block the second D end D', and simultaneously connects the second C end C' with the second S end S', controls the second throttling device 52 to close, controls the first throttling device 51 and the third throttling device 53 to open, and controls the opening degree of both to change.

[0124] When the water temperature is less than the preset value, the control executes the normal defrosting operation mode. In the defrosting mode, the control steps are as follows: the four-way valve 21 is controlled to connect the first D end D and the first C end C, and at the same time, the first E end E and the first S end S are connected; the three-way valve 22 is controlled to connect the second D end D' and the second C end C', and at the same time, the second S end S' is blocked; the third throttling device 53 is controlled to close; the first throttling device 51 and the second throttling device 52 are controlled to open and their opening degrees are controlled to change.

[0125] In the judgment step, if it is determined that the mode is neither cooling mode, nor heating mode, nor hot water mode, nor defrosting mode, the control step controls the air conditioner water heater to stop.

[0126] like Figure 4 As shown, during hot water production mode, the four-way valve 21 is energized, connecting pipes D and E, and pipes C and S; the three-way valve 22 is de-energized, connecting pipes D and C, and pipes S and E; the second throttling device 52 is closed. The high-temperature, high-pressure gaseous refrigerant discharged from the compressor enters the heat exchanger in the static water tank 8 through pipes D and C of the three-way valve 22, condensing and releasing heat to heat the water in the tank. The condensed, subcooled liquid refrigerant then enters the liquid storage device 6 through the third throttling device 53. The refrigerant in the liquid storage device 6, after being throttled and depressurized by the first throttling device 51, enters the outdoor heat exchanger 3. The low-temperature, low-pressure refrigerant absorbs heat and vaporizes in the outdoor heat exchanger 3, becoming a low-pressure superheated gas. It then enters the compressor's suction port through pipes C and S of the four-way valve 21. The refrigerant is compressed into a high-temperature, high-pressure state in the compressor cylinder and discharged through the compressor's exhaust port, thus completing the entire hot water production cycle.

[0127] like Figure 7As shown, during the heat storage defrosting mode, the four-way valve 21 and the three-way valve 22 are energized, with pipes D and E connected and pipes C and S connected, and the second throttling device 52 closed. The high-temperature, high-pressure gaseous refrigerant discharged from the compressor enters the outdoor heat exchanger 3 through pipes D and C of the four-way valve 21, releasing heat and condensing to melt the frost layer on the outdoor heat exchanger. The condensed refrigerant liquid then enters the liquid storage device 6 through the first throttling device 51. The refrigerant in the liquid storage device 6 is throttled and depressurized by the third throttling device 53 before entering the water tank heat exchanger 83. After evaporating and absorbing heat from the hot water in the water tank, it becomes a low-pressure superheated gas. The low-pressure superheated gas exiting the water tank heat exchanger 83 enters the compressor's suction port through pipes E and S of the three-way valve 22. The refrigerant is compressed into a high-temperature, high-pressure state in the compressor cylinder and then discharged through the compressor's discharge port, thus completing the entire heat storage defrosting cycle.

[0128] like Figure 2 As shown, during normal defrosting mode operation, both the four-way valve 21 and the three-way valve 22 are de-energized, while pipes D and C are open, and pipes S and E are open, and the third throttling device 53 is closed. The high-temperature, high-pressure refrigerant gas discharged from the compressor enters the outdoor heat exchanger 3 through pipes D and C of the four-way valve 21. In the outdoor heat exchanger 3, it is cooled and condensed into high-pressure liquid refrigerant. Then, after partial throttling by the first throttling device 51, it enters the liquid receiver 6. The refrigerant in the liquid receiver is further throttled and depressurized by the second throttling device 52, becoming a low-temperature, low-pressure two-phase state before entering the indoor heat exchanger 4. In the indoor heat exchanger, it absorbs heat and vaporizes, cooling the indoor air to meet the refrigeration requirements. After heat exchange, the low-pressure refrigerant gas enters the compressor's suction port through pipes E and S of the four-way valve 21, where it is compressed into a high-temperature, high-pressure gas state in the compressor cylinder, thus completing the entire refrigeration cycle.

[0129] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. An air-conditioning water heater, characterized in that: include: The compressor (1), outdoor heat exchanger (3), indoor heat exchanger (4), water tank (8) and liquid storage device (6) are provided. The exhaust end of the compressor (1) can be connected to one end of the outdoor heat exchanger (3), or to one end of the indoor heat exchanger (4), or to one end of the water tank (8). The other end of the outdoor heat exchanger (3) is connected to the interior of the liquid storage device (6). The other end of the indoor heat exchanger (4) is connected to the interior of the liquid storage device (6). The other end of the water tank (8) is connected to the interior of the liquid storage device (6). The suction end of the compressor (1) can be connected to one end of the outdoor heat exchanger (3), or to one end of the indoor heat exchanger (4), or to one end of the water tank (8). It also includes a four-way valve (21), which includes a first D end (D), a first E end (E), a first S end (S), and a first C end (C). The four-way valve (21) can switch between the following two connection states: In the first state, the first D end (D) is connected to the first C end (C), and the first E end (E) is connected to the first S end (S); In the second state, the first D end (D) is connected to the first E end (E), and the first C end (C) is connected to the first S end (S). The first D end (D) is connected to the exhaust end of the compressor (1) through the first pipe (101), the first E end (E) is connected to one end of the indoor heat exchanger (4) through the second pipe (102), the first S end (S) is connected to the suction end of the compressor (1) through the third pipe (103), and the first C end (C) is connected to one end of the outdoor heat exchanger (3) through the fourth pipe (104). The other end of the outdoor heat exchanger (3) is connected to the interior of the liquid storage device (6) through the fifth pipe (105), the other end of the indoor heat exchanger (4) is connected to the interior of the liquid storage device (6) through the sixth pipe (106), and the other end of the water tank (8) is connected to the interior of the liquid storage device (6) through the seventh pipe (107). It also includes a three-way valve (22), which includes a second D end (D'), a second S end (S'), and a second C end (C'). The three-way valve (22) can switch between the following two connection states: In the first state, the second D end (D') is connected to the second C end (C'), while the second S end (S') is blocked; In the second state, the second D end (D') is blocked, while the second C end (C') is connected to the second S end (S'). The second D end (D') is connected to the exhaust end of the compressor (1) through the eighth pipe (108), the second S end (S') can be connected to the intake end of the compressor (1) through the ninth pipe (109), and the second C end (C') can be connected to one end of the water tank (8) through the tenth pipe (110). The tenth pipeline (110) contacts the water tank (8) through the refrigerant pipeline and exchanges heat with the water in the water tank (8). One end of the water tank (8) is one end of the refrigerant pipeline, and the other end of the water tank (8) is the other end of the refrigerant pipeline. The other end of the refrigerant pipeline is connected to the seventh pipeline (107). The refrigerant pipeline forms at least a part of the structure of the water tank heat exchanger (83). The fifth pipeline (105) is provided with a first throttling device (51), the sixth pipeline (106) is provided with a second throttling device (52), and the seventh pipeline (107) is provided with a third throttling device (53).

2. The air-conditioning water heater according to claim 1, characterized in that: The fifth pipe (105) is connected to the inside of the liquid storage device (6) at one end, which is the first end. The first end is higher than the inner bottom surface of the liquid storage device (6) by a distance of the first height. The sixth pipe (106) is connected to the inside of the liquid storage device (6) at one end, which is the second end. The second end is higher than the inner bottom surface of the liquid storage device (6) by a distance of the second height. The seventh pipe (107) is connected to the inside of the liquid storage device (6) at one end, which is the third end. The third end is higher than the inner bottom surface of the liquid storage device (6) by a distance of the third height. The distance between the first end and the top of the liquid storage device (6) is the fourth height, and the fourth height is greater than the first height. The distance between the second end and the top of the liquid storage device (6) is the fifth height, and the fifth height is greater than the second height. The distance between the third end and the top of the liquid storage device (6) is the sixth height, and the sixth height is greater than the third height.

3. The air-conditioning water heater according to claim 2, characterized in that: The liquid storage device (6) has a middle height dividing line at half the height, the first end is at a distance of the seventh height from the middle height dividing line, and the seventh height is greater than the first height, the second end is at a distance of the eighth height from the middle height dividing line, and the eighth height is greater than the second height, the third end is at a distance of the ninth height from the middle height dividing line, and the ninth height is greater than the third height.

4. The air-conditioning water heater according to claim 1, characterized in that: It also includes an indoor fan (72) and an outdoor fan (71), the outdoor fan (71) being opposite to the outdoor heat exchanger (3) so as to drive airflow to exchange heat with the refrigerant in the outdoor heat exchanger (3).

5. A control method for an air-conditioning water heater as described in any one of claims 1-4, characterized in that: include: Testing steps, and the required operating modes of the testing system; The judgment step is to determine which of the following operating modes is required: cooling mode, heating mode, cooling + hot water mode, heating + hot water mode, hot water mode, and defrosting mode; The control steps involve controlling the switching of the four-way valve (21) and the three-way valve (22) according to the needs of different operating modes, as well as controlling the opening and closing of the first throttling device (51), the second throttling device (52) and the third throttling device (53) and adjusting the opening size.

6. The control method according to claim 5, characterized in that: In the control steps, when the required operating mode of the system is the cooling mode, the four-way valve (21) is controlled to connect the first D end (D) with the first C end (C), and at the same time, the first E end (E) is connected with the first S end (S). The third throttling device (53) is controlled to close, and the first throttling device (51) and the second throttling device (52) are controlled to open and their opening degrees are controlled to change. When the required operating mode of the system is heating mode, the four-way valve (21) is controlled to connect the first D end (D) with the first E end (E), and at the same time the first C end (C) is connected with the first S end (S), and the third throttling device (53) is controlled to close, and the first throttling device (51) and the second throttling device (52) are controlled to open and the opening degree of the two is controlled to change. When the required operating mode of the system is cooling mode + hot water production, the four-way valve (21) is controlled to connect the first D end (D) with the first C end (C), and at the same time the first E end (E) is connected with the first S end (S). The three-way valve (22) is controlled to connect the second D end (D') with the second C end (C'), and at the same time the second S end (S') is blocked. The first throttling device (51) is controlled to close, and the third throttling device (53) and the second throttling device (52) are controlled to open and their opening degrees are controlled to change. When the required operating mode of the system is heating mode + hot water production, the four-way valve (21) is controlled to connect the first D end (D) with the first E end (E), and at the same time, the first C end (C) is connected with the first S end (S). The three-way valve (22) is controlled to connect the second D end (D') with the second C end (C'), and at the same time, the second S end (S') is blocked. The first throttling device (51), the second throttling device (52) and the third throttling device (53) are controlled to open and the opening degree of the three is controlled to change.

7. The control method according to claim 6, characterized in that: The judgment step, after determining that it is neither a cooling mode nor a heating mode, then determines whether it is a single hot water mode. In the control steps, if it is a single hot water mode, control the four-way valve (21) to connect the first D end (D) with the first E end (E), and at the same time connect the first C end (C) with the first S end (S), and control the second throttling device (52) to close, control the three-way valve (22) to connect the second D end (D') with the second C end (C'), and at the same time block the second S end (S'), control the first throttling device (51) and the third throttling device (53) to open and control the opening size of the two to change; The judgment step, after determining that it is neither a cooling mode, nor a heating mode, nor a single hot water mode, then determines whether it is a defrosting mode. If the defrost mode is in use, the detection steps also include detecting the water temperature in the water tank; When the water temperature is ≥ the preset value, the heat storage defrosting operation mode is executed. The four-way valve (21) is controlled to connect the first D end (D) and the first C end (C), and at the same time, the first E end (E) and the first S end (S) are connected. The three-way valve (22) is controlled to block the second D end (D'), and at the same time, the second C end (C') and the second S end (S') are connected. The second throttling device (52) is controlled to close, and the first throttling device (51) and the third throttling device (53) are controlled to open and their opening degree is controlled to change. When the water temperature is less than the preset value, the system controls the execution of the normal defrosting operation mode, controls the four-way valve (21) to connect the first D end (D) and the first C end (C), and at the same time connect the first E end (E) and the first S end (S), controls the three-way valve (22) to connect the second D end (D') and the second C end (C'), and at the same time block the second S end (S'), controls the third throttling device (53) to close, controls the first throttling device (51) and the second throttling device (52) to open and controls the opening degree of the two to change. In the judgment step, if it is determined that the mode is neither cooling mode, nor heating mode, nor hot water mode, nor defrosting mode, the control step controls the air conditioner water heater to stop.

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