Air conditioner

Abstract

The air conditioner comprises control valves, the control valves are arranged between an exhaust port and the head end of a first pipeline, between the exhaust port and the head end of a second pipeline and between the exhaust port and the tail end of a third pipeline, and the control valves are used for changing the flowing direction of refrigerants exhausted from the exhaust port; and the controller is connected with the control valve, and the controller is configured to control the conduction condition of the control valve according to the operation mode of the air conditioner so as to guide a refrigerant discharged from the exhaust port to enter the first pipeline, the second pipeline and / or the third pipeline. By adopting the air conditioner, the flow direction of the refrigerant discharged from the exhaust port of the compressor can be changed according to different operation modes, so that the air conditioner has multiple operation modes, and meanwhile, the problem that the refrigerating or heating capacity is insufficient or excessive due to the fact that the refrigerant firstly heats the water tank is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly to an air conditioner. Background Art

[0002] In related technologies, existing air conditioners adopt a solution of adding a water tank to the refrigeration system to achieve the function of preparing domestic hot water while the air conditioner is operating in cooling or heating mode. However, after the refrigerant is discharged from the compressor, regardless of the mode of the air conditioner, it will first pass through the water tank to heat the water in the tank. As a result, the air conditioner may have problems of insufficient or excessive cooling or heating capacity. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, an object of the present invention is to provide an air conditioner. By using this air conditioner, the flow direction of the refrigerant discharged from the compressor exhaust port can be changed according to different operating modes, so as to avoid the problems of insufficient or excessive cooling or heating capacity caused by the refrigerant heating the water tank first while the air conditioner has multiple operating modes.

[0004] To solve the above problems, an air conditioner according to an embodiment of the first aspect of the present invention includes: a water tank for storing domestic water; a first heat exchanger located outdoors for exchanging heat with the circulating refrigerant; a second heat exchanger connected to the water tank for exchanging heat with the domestic water; a third heat exchanger located indoors for adjusting the indoor temperature; a compressor having an exhaust port; a first pipeline, a second pipeline, and a third pipeline. The first ends of the first pipeline and the second pipeline are both used to connect to the exhaust port, the second ends of the first pipeline and the second pipeline are both used to connect to the first end of the third pipeline, the second end of the third pipeline is used to connect to the exhaust port, the first heat exchanger is located on the first pipeline, the second heat exchanger is located on the second pipeline, and the third heat exchanger is located on the third pipeline; a control valve disposed between the exhaust port and the first ends of the first pipeline, the second pipeline, and the second end of the third pipeline, and the control valve is used to change the flow direction of the refrigerant discharged from the exhaust port; a controller connected to the control valve, and the controller is configured to: control the opening and closing of the control valve according to the operating mode of the air conditioner to guide the refrigerant discharged from the exhaust port into the first pipeline, the second pipeline, and / or the third pipeline.

[0005] An air conditioner according to an embodiment of the present invention separately arranges three heat exchangers on different pipelines, and a control valve is arranged between each pipeline and the exhaust port of the compressor. Thus, when the compressor discharges refrigerant, it is no longer the case that the refrigerant only passes through the water tank preferentially, but the conduction of the control valve is controlled based on the operating mode of the air conditioner, so as to selectively control the refrigerant discharged from the exhaust port to enter the first pipeline, the second pipeline, and / or the third pipeline. Thereby, while the air conditioner has multiple different operating modes, the problem of insufficient or excessive cooling or heating capacity caused by the refrigerant heating the water tank first is avoided.

[0006] In some embodiments, the air conditioner further includes: a liquid storage tank, the outlet of the liquid storage tank is connected to the inlet of the compressor; a first expansion valve, the first expansion valve is arranged on the first pipeline, and the first expansion valve is used to adjust the refrigerant flow rate in the first pipeline; a second expansion valve, the second expansion valve is arranged on the second pipeline, and the second expansion valve is used to adjust the refrigerant flow rate in the second pipeline; a third expansion valve, the first end of the third expansion valve is connected to the end of the first pipeline and the end of the second pipeline, the second end of the third expansion valve is connected to the first end of the third heat exchanger, and the third expansion valve is used to adjust the refrigerant flow rate in the third pipeline; the control valve includes: a first four-way valve, the D end of the first four-way valve is connected to the exhaust port, the C end of the first four-way valve is connected to the head end of the second pipeline, and the E end and the S end of the first four-way valve are connected together and then connected to the inlet of the liquid storage tank; a second four-way valve, the D end of the second four-way valve is connected to the exhaust port, the E end of the second four-way valve is connected to the end of the third pipeline, and the S end of the second four-way valve is connected to the inlet of the liquid storage tank; a three-way valve, the first end of the three-way valve is connected to the head end of the first pipeline, the second end of the three-way valve is connected to the C end of the second four-way valve, and the third end of the three-way valve is connected to the inlet of the liquid storage tank.

[0007] The above technical solution has the following advantages or beneficial effects: Based on the arrangement of three expansion valves, two four-way valves, and one three-way valve, by controlling the conduction of each valve, the refrigerant discharged from the exhaust port is selectively controlled to enter the first pipeline, the second pipeline, and / or the third pipeline. Thereby, while the air conditioner has multiple different operating modes, the problem of insufficient or excessive cooling or heating capacity caused by the refrigerant heating the water tank first is avoided.

[0008] In some embodiments, for controlling the opening and closing of the control valve according to the operating mode of the air conditioner to guide the refrigerant discharged at the exhaust port into the first pipeline, the second pipeline, and / or the third pipeline, the controller is specifically configured as follows: when the operating mode is the cooling mode, control both the first expansion valve and the third expansion valve to open, control the second expansion valve to close, and control the C end of the first four-way valve to communicate with the S end of the first four-way valve, the E end of the first four-way valve to communicate with the D end of the first four-way valve, the C end of the second four-way valve to communicate with the D end of the second four-way valve, the E end of the second four-way valve to communicate with the S end of the second four-way valve, and the first end of the three-way valve to communicate with the second end of the three-way valve, so as to guide the refrigerant to enter the intake port of the compressor from the exhaust port through the first pipeline and the third pipeline in sequence.

[0009] The above technical solution has the following advantages or beneficial effects: Based on the setting method of three expansion valves, two four-way valves, and one three-way valve, the cooling mode can be effectively achieved through the above control method to meet the cooling needs of users.

[0010] In some embodiments, for controlling the opening and closing of the control valve according to the operating mode of the air conditioner to guide the refrigerant discharged at the exhaust port into the first pipeline, the second pipeline, and / or the third pipeline, the controller is specifically configured as follows: when the operating mode is the heating mode, control both the first expansion valve and the third expansion valve to open, control the second expansion valve to close, and control the C end of the first four-way valve to communicate with the S end of the first four-way valve, the E end of the first four-way valve to communicate with the D end of the first four-way valve, the C end of the second four-way valve to communicate with the S end of the second four-way valve, the E end of the second four-way valve to communicate with the D end of the second four-way valve, and the first end of the three-way valve to communicate with the second end of the three-way valve, so as to guide the refrigerant to enter the intake port of the compressor from the exhaust port through the third pipeline and the first pipeline in sequence.

[0011] The above technical solution has the following advantages or beneficial effects: Based on the setting method of three expansion valves, two four-way valves, and one three-way valve, the heating mode can be effectively achieved through the above control method to meet the heating needs of users.

[0012] In some embodiments, for controlling the opening and closing of the control valve according to the operating mode of the air conditioner to guide the refrigerant discharged from the exhaust port into the first pipeline, the second pipeline, and / or the third pipeline, the controller is specifically configured as follows: when the operating mode is the simultaneous refrigeration and hot water production mode, control the first expansion valve, the second expansion valve, and the third expansion valve to be all opened, and control the C end of the first four-way valve to communicate with the D end of the first four-way valve, the E end of the first four-way valve to communicate with the S end of the first four-way valve, the C end of the second four-way valve to communicate with the D end of the second four-way valve, the E end of the second four-way valve to communicate with the S end of the second four-way valve, and the first end of the three-way valve to communicate with the third end of the three-way valve, so as to guide the refrigerant to enter the second pipeline from the exhaust port and be split at the end of the second pipeline, so that a part of the refrigerant enters the first pipeline and another part of the refrigerant enters the third pipeline, and finally, after the refrigerant converges into the liquid storage tank, it enters the intake port of the compressor.

[0013] The above technical solution has the following advantages or beneficial effects: Based on the setting method of three expansion valves, two four-way valves, and one three-way valve, the above control method can simultaneously meet the refrigeration demand and the hot water production demand of users.

[0014] In some embodiments, for controlling the opening and closing of the control valve according to the operating mode of the air conditioner to guide the refrigerant discharged from the exhaust port into the first pipeline, the second pipeline, and / or the third pipeline, the controller is specifically configured as follows: when the operating mode is the simultaneous refrigeration and hot water production mode, control the second expansion valve and the third expansion valve to be both opened, control the first expansion valve to be closed, and control the C end of the first four-way valve to communicate with the D end of the first four-way valve, the E end of the first four-way valve to communicate with the S end of the first four-way valve, the C end of the second four-way valve to communicate with the D end of the second four-way valve, the E end of the second four-way valve to communicate with the S end of the second four-way valve, and the first end of the three-way valve to communicate with the second end of the three-way valve, so as to guide the refrigerant to enter the intake port of the compressor from the exhaust port through the second pipeline and the third pipeline in sequence.

[0015] The above technical solution has the following advantages or beneficial effects: Based on the setting method of three expansion valves, two four-way valves, and one three-way valve, the above control method can simultaneously meet the refrigeration demand and the hot water production demand of users.

[0016] In some embodiments, for controlling the opening and closing of the control valve according to the operating mode of the air conditioner to guide the refrigerant discharged from the exhaust port into the first pipeline, the second pipeline, and / or the third pipeline, the controller is specifically configured as follows: when the operating mode is the simultaneous refrigeration and hot water heating mode, control the first expansion valve, the second expansion valve, and the third expansion valve to be all opened, and control the C end of the first four-way valve to be communicated with the D end of the first four-way valve, the E end of the first four-way valve to be communicated with the S end of the first four-way valve, the C end of the second four-way valve to be communicated with the D end of the second four-way valve, the E end of the second four-way valve to be communicated with the S end of the second four-way valve, and the first end of the three-way valve to be communicated with the second end of the three-way valve, so as to guide a part of the refrigerant into the first pipeline and guide another part of the refrigerant into the second pipeline, and after the refrigerant converges into the third pipeline, enter the intake port of the compressor.

[0017] The above technical solution has the following advantages or beneficial effects: Based on the setting manner of three expansion valves, two four-way valves, and one three-way valve, the above control method can simultaneously meet the user's refrigeration demand and hot water heating demand.

[0018] In some embodiments, for controlling the opening and closing of the control valve according to the operating mode of the air conditioner to guide the refrigerant discharged from the exhaust port into the first pipeline, the second pipeline, and / or the third pipeline, the controller is specifically configured as follows: when the operating mode is the hot water heating mode, control the first expansion valve and the second expansion valve to be both opened, control the third expansion valve to be closed, and control the C end of the first four-way valve to be communicated with the D end of the first four-way valve, the E end of the first four-way valve to be communicated with the S end of the first four-way valve, the C end of the second four-way valve to be communicated with the D end of the second four-way valve, the E end of the second four-way valve to be communicated with the S end of the second four-way valve, and the first end of the three-way valve to be communicated with the third end of the three-way valve, so as to guide the refrigerant from the exhaust port to enter the intake port of the compressor sequentially through the second pipeline and the first pipeline.

[0019] The above technical solution has the following advantages or beneficial effects: Based on the setting manner of three expansion valves, two four-way valves, and one three-way valve, the above control method can effectively implement the hot water heating mode and meet the user's hot water heating demand.

[0020] In some embodiments, for controlling the opening and closing of the control valve according to the operating mode of the air conditioner to guide the refrigerant discharged from the exhaust port into the first pipeline, the second pipeline, and / or the third pipeline, the controller is specifically configured as follows: when the operating mode is the simultaneous heating and hot water heating mode, control the first expansion valve, the second expansion valve, and the third expansion valve to be all opened, and control the C end of the first four-way valve to be communicated with the D end of the first four-way valve, the E end of the first four-way valve to be communicated with the S end of the first four-way valve, the C end of the second four-way valve to be communicated with the S end of the second four-way valve, the E end of the second four-way valve to be communicated with the D end of the second four-way valve, and the first end of the three-way valve to be communicated with the second end of the three-way valve, so as to guide a part of the refrigerant into the third pipeline and another part of the refrigerant into the second pipeline, and after the refrigerant converges into the first pipeline, enter the intake port of the compressor.

[0021] The above technical solution has the following advantages or beneficial effects: Based on the setting of three expansion valves, two four-way valves, and one three-way valve, the above control method can simultaneously meet the heating demand and hot water heating demand of users.

[0022] In some embodiments, for controlling the opening and closing of the control valve according to the operating mode of the air conditioner to guide the refrigerant discharged from the exhaust port into the first pipeline, the second pipeline, and / or the third pipeline, the controller is specifically configured as follows: when the operating mode is the defrosting mode, control the first expansion valve and the third expansion valve to be all opened, control the second expansion valve to be closed, and control the C end of the first four-way valve to be communicated with the S end of the first four-way valve, the E end of the first four-way valve to be communicated with the D end of the first four-way valve, the C end of the second four-way valve to be communicated with the D end of the second four-way valve, the E end of the second four-way valve to be communicated with the S end of the second four-way valve, and the first end of the three-way valve to be communicated with the second end of the three-way valve, so as to guide the refrigerant to enter the intake port of the compressor from the exhaust port through the first pipeline and the third pipeline in sequence; or, when the operating mode is the defrosting mode, control the first expansion valve and the second expansion valve to be all opened, control the third expansion valve to be closed, and control the C end of the first four-way valve to be communicated with the S end of the first four-way valve, the E end of the first four-way valve to be communicated with the D end of the first four-way valve, the C end of the second four-way valve to be communicated with the D end of the second four-way valve, the E end of the second four-way valve to be communicated with the S end of the second four-way valve, and the first end of the three-way valve to be communicated with the second end of the three-way valve, so as to guide the refrigerant to enter the intake port of the compressor from the exhaust port through the first pipeline and the second pipeline in sequence.

[0023] The above technical solution has the following advantages or beneficial effects: Based on the setting method of three expansion valves, two four-way valves and one three-way valve, the defrosting mode can be effectively realized through the above control method to meet the defrosting needs of users.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of embodiments in conjunction with the accompanying drawings, in which: Figure 1 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention; Figure 2 is a schematic diagram of the refrigerant flow of an air conditioner according to an embodiment of the present invention; Figure 3 is a schematic diagram of the refrigerant flow of an air conditioner according to another embodiment of the present invention; Figure 4 is a schematic diagram of the refrigerant flow of an air conditioner according to another embodiment of the present invention; Figure 5 is a schematic diagram of the refrigerant flow of an air conditioner according to another embodiment of the present invention; Figure 6 is a schematic diagram of the refrigerant flow of an air conditioner according to another embodiment of the present invention; Figure 7 is a schematic diagram of the refrigerant flow of an air conditioner according to another embodiment of the present invention; Figure 8 is a schematic diagram of the refrigerant flow of an air conditioner according to another embodiment of the present invention; Figure 9 is a schematic diagram of the refrigerant flow of an air conditioner according to another embodiment of the present invention; Figure 10 is a schematic structural diagram of an air conditioner according to another embodiment of the present invention; Figure 11 is a schematic diagram of the refrigerant flow of an air conditioner according to another embodiment of the present invention; Figure 12 is a schematic diagram of the refrigerant flow of an air conditioner according to another embodiment of the present invention; Figure 13 is a schematic diagram of the refrigerant flow of an air conditioner according to another embodiment of the present invention; Figure 14 is a schematic diagram of the refrigerant flow of an air conditioner according to another embodiment of the present invention; Figure 15It is a flowchart of a control method of an air conditioner according to another embodiment of the present invention; Figure 16 It is a schematic structural diagram of an air conditioner according to an embodiment of the present invention; Figure 17 It is a schematic diagram of refrigerant flow in an air conditioner according to an embodiment of the present invention; Figure 18 It is a schematic diagram of refrigerant flow in an air conditioner according to another embodiment of the present invention; Figure 19 It is a schematic table diagram of the change range of the operating frequency of a compressor according to an embodiment of the present invention; Figure 20 It is a schematic table diagram of a second opening increment according to an embodiment of the present invention; Figure 21 It is a schematic table diagram of a third opening increment according to an embodiment of the present invention; Figure 22 It is a schematic table diagram of the action trends of three expansion valves according to an embodiment of the present invention.

[0026] Reference numerals: Air conditioner 100; Compressor 1; water tank 2; first heat exchanger 3; second heat exchanger 4; third heat exchanger 5; liquid storage tank 6; first expansion valve 7; second expansion valve 8; third expansion valve 9; first four-way valve 10; second four-way valve 11; three-way valve 12; economizer 13; second liquid storage tank 14; fourth expansion valve 15, water pump 16. Detailed description of the specific implementation

[0027] The embodiments of the present invention will be described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention will be described in detail below.

[0028] In this application, the air conditioner performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes, involving compression, condensation, expansion, and evaporation, and supplying a refrigerant to the air that has been conditioned and heat-exchanged.

[0029] The compressor compresses the refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

[0030] The expansion valve expands the high-temperature and high-pressure liquid-phase refrigerant condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in the low-temperature and low-pressure state to the compressor. The evaporator can achieve a refrigeration effect by using the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. Throughout the cycle, the air conditioner can adjust the temperature of the indoor space.

[0031] The outdoor unit of the air conditioner refers to the part of the refrigeration cycle including the compressor and the outdoor heat exchanger. The indoor unit of the air conditioner includes the indoor heat exchanger, and the expansion valve can be provided in the indoor unit or the outdoor unit.

[0032] The indoor heat exchanger and the outdoor heat exchanger are used as condensers or evaporators. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater in the heating mode. When the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler in the cooling mode.

[0033] With the popularization of air-conditioning products, users pay more and more attention to the utilization of the waste heat of air conditioners. However, only being able to perform all heat recovery or partial heat recovery will result in the overall energy utilization efficiency. Therefore, current air conditioners should conduct a further exploration of the waste heat recovery generated by air conditioners.

[0034] To solve the above problems, an embodiment of the first aspect of the present invention provides an air conditioner. By using this air conditioner, the refrigerant flow direction can be changed according to different operating modes. While the air conditioner has multiple operating modes, it can avoid the problems of insufficient or excessive cooling or heating capacity caused by the refrigerant heating the water tank first.

[0035] The following refers to Figure 1 Describe the air conditioner 100 according to an embodiment of the present invention. The air conditioner 100 includes a compressor 1, a water tank 2, a first heat exchanger 3, a second heat exchanger 4, a third heat exchanger 5, a first pipeline, a second pipeline, a third pipeline, a control valve, and a controller.

[0036] Among them, the water tank 2 is used to store domestic water; the first heat exchanger 3 is located outdoors and is used to exchange heat with the circulating refrigerant; the second heat exchanger 4 is connected to the water tank 2 and is used to exchange heat with domestic water; the third heat exchanger 5 is located indoors and is used to adjust the indoor temperature; that is, the air conditioner is a combined heat and power unit.

[0037] The first ends of the first pipeline and the second pipeline are both used to connect to the exhaust port. The last ends of the first pipeline and the second pipeline are both used to connect to the first end of the third pipeline. The last end of the third pipeline is used to connect to the exhaust port. The first heat exchanger 3 is located on the first pipeline. The second heat exchanger 4 is located on the second pipeline. The third heat exchanger 5 is located on the third pipeline. The control valve is arranged between the exhaust port and the first ends of the first pipeline, the second pipeline, and the last end of the third pipeline. The control valve is used to change the flow direction of the refrigerant discharged at the exhaust port. The controller is connected to the control valve and is configured to: control the opening and closing of the control valve according to the operating mode of the air conditioner 100 to guide the refrigerant discharged at the exhaust port into the first pipeline, the second pipeline, and / or the third pipeline. Based on the architecture of the air conditioner 100 described above, the controller of the air conditioner 100 is configured to control the opening and closing of the control valve according to the operating mode of the air conditioner 100 to guide the refrigerant discharged at the exhaust port into the first pipeline, the second pipeline, and / or the third pipeline.

[0038] Specifically, to solve the above problems, in this application, a first pipeline and a second pipeline are led out from the exhaust port of the compressor 1 of the air conditioner 100. The first pipeline is connected to the exhaust port of the compressor 1 and the first heat exchanger 3, the second pipeline is connected to the exhaust port of the compressor 4 and the second heat exchanger 4, and the third pipeline is connected to the ends of the first pipeline and the second pipeline and the exhaust port of the compressor 4. The second heat exchanger 4 is controlled separately as a single path, and control valves are provided on the first pipeline, the second pipeline, and the third pipeline to control the conduction of the control valves according to the operating mode of the air conditioner 100, thereby changing the flow direction of the refrigerant at the exhaust port of the compressor 1, so that the refrigerant flows into the second heat exchanger 4 to heat domestic water according to the operating mode, or does not flow into the second heat exchanger 4 to avoid heating the water tank 2 first. Thus, the air conditioner 100 can achieve multiple operating modes and avoid the problems of insufficient or excessive cooling or heating capacity of the air conditioner 100 caused by heating the water tank 2 first. Therefore, compared with the prior art in which the refrigerant always passes through the water tank 2 regardless of the mode of the air conditioner 100 and heats the water in the water tank 2, in this application, a first pipeline and a second pipeline are led out from the exhaust port of the compressor 4, the second heat exchanger 4 is controlled separately as a single path instead of being connected in series between the compressor 4 and other heat exchangers, and control valves are provided to change the flow direction of the refrigerant according to the operating mode of the air conditioner 100. If there is no need to heat the water tank 2 in the operating mode, the refrigerant can be made not to enter the second heat exchanger 4 and does not necessarily pass through the second heat exchanger 4. Thus, the air conditioner 100 can achieve multiple operating modes and avoid the problems of insufficient or excessive cooling or heating capacity of the air conditioner 100 caused by heating the water tank 2 first. If there is a need to heat the water tank in the operating mode, the refrigerant can be made to enter the second heat exchanger 4 to produce hot water during heating or cooling, thereby improving the comfort of the air conditioner 100, and producing hot water while cooling can reduce energy waste. The control valve can be various valves, such as solenoid valves, expansion valves, three-way valves, four-way valves, etc., and no specific limitation is made here. The following will be described by taking the control valve as a solenoid valve as an example.

[0039] Among them, the first heat exchanger 3 can be a tube-fin heat exchanger for heat exchange between air and refrigerant, or a plate heat exchanger for heat exchange between water and refrigerant, or a shell-and-tube heat exchanger for heat exchange between water and refrigerant; the second heat exchanger 4 can be a plate heat exchanger for heat exchange between water and refrigerant, or a shell-and-tube heat exchanger for heat exchange between water and refrigerant; the third heat exchanger 5 can be a plate heat exchanger for heat exchange between water and refrigerant, or a shell-and-tube heat exchanger for heat exchange between water and refrigerant. The type of heat exchanger can be selected according to actual conditions and is not specifically limited here; the compressor 1 has the function of replenishing air and increasing enthalpy; a heat exchanger is installed inside the water tank 2 to heat the water in the water tank, and the water inlet and water outlet of the water tank 2 are the water inlet and water outlet of the heat exchanger inside the water tank. The heat exchanger and the water tank are connected by a water pump 16, and the flow of domestic water in the water tank is controlled by the water pump 16, and an insulation layer is arranged inside the water tank 2 to keep the domestic water inside the water tank 2 warm to avoid energy waste.

[0040] Exemplarily, if it is determined that the operating mode of the air conditioner 100 is cooling but there is no demand for hot water production, the on-off states of the solenoid valves on the first pipeline, the second pipeline, and the third pipeline are controlled so that the refrigerant discharged from the compressor 1 through the exhaust port sequentially passes through the first pipeline and the third pipeline and then enters the intake port of the compressor 1; or the operating mode of the air conditioner 100 is heating but there is no demand for hot water production. At this time, the refrigerant discharged from the compressor 1 through the exhaust port sequentially passes through the third pipeline and the first pipeline and then enters the intake port of the compressor 1; or the operating mode of the air conditioner 100 is cooling and there is a demand for hot water production. The on-off states of the solenoid valves on the first pipeline, the second pipeline, and the third pipeline are controlled so that the refrigerant discharged from the compressor 1 through the exhaust port passes through the second pipeline, flows through the second heat exchanger 4 to heat the domestic water stored in the water tank 2, and then the refrigerant is split. One part passes through the first pipeline, and the other part passes through the third pipeline and finally enters the intake port of the compressor 1; or the operating mode of the air conditioner 100 is cooling and there is a demand for hot water production. The on-off states of the solenoid valves on the first pipeline, the second pipeline, and the third pipeline are controlled so that the refrigerant discharged from the compressor 1 through the exhaust port passes through the second pipeline, flows through the second heat exchanger 4 to heat the domestic water stored in the water tank 2, enters the compressor 1 through the third pipeline; or the operating mode of the air conditioner 100 is cooling and there is a demand for hot water production. The on-off states of the solenoid valves on the first pipeline, the second pipeline, and the third pipeline are controlled so that the refrigerant discharged from the compressor 1 through the exhaust port passes through the second pipeline, flows through the second heat exchanger 4 to heat the domestic water stored in the water tank 2, and then enters the compressor 1 through the third pipeline; or the operating mode of the air conditioner 100 is cooling and there is a demand for hot water production. The on-off states of the solenoid valves on the first pipeline, the second pipeline, and the third pipeline are controlled so that a part of the refrigerant discharged from the compressor 1 through the exhaust port passes through the second pipeline, flows through the second heat exchanger 4 to heat the domestic water stored in the water tank 2, and the other part passes through the first pipeline, and after confluence, enters the third pipeline and then enters the intake port of the compressor 1; or the operating mode of the air conditioner 100 is only a demand for hot water production. The on-off states of the solenoid valves on the first pipeline, the second pipeline, and the third pipeline are controlled so that the refrigerant discharged from the compressor 1 through the exhaust port passes through the second pipeline, flows through the second heat exchanger 4 to heat the domestic water stored in the water tank 2, and then enters the compressor 1 through the first pipeline; or the operating mode of the air conditioner 100 is heating and there is a demand for hot water production. The on-off states of the solenoid valves on the first pipeline, the second pipeline, and the third pipeline are controlled so that a part of the refrigerant discharged from the compressor 1 through the exhaust port passes through the second pipeline, flows through the second heat exchanger 4 to heat the domestic water stored in the water tank 2, and the other part passes through the third pipeline, and after confluence, passes through the first pipeline and then enters the intake port of the compressor 1;If the operating mode of the air conditioner 100 has a defrosting requirement, then by controlling the opening and closing of the solenoid valves on the first pipeline, the second pipeline, and the third pipeline, after the refrigerant discharged from the compressor 1 through the exhaust port passes through the first pipeline, it returns to the exhaust port of the compressor 1 through the third pipeline or flows through the second heat exchanger 4 in the second pipeline to heat the domestic water stored in the water tank 2, and then returns to the intake port of the compressor 1. Thus, while enabling the air conditioner 100 to have multiple different operating modes, it avoids the problem of insufficient or excessive cooling or heating capacity caused by the refrigerant heating the water tank first.

[0041] For the air conditioner 100 according to an embodiment of the present invention, the three heat exchangers are respectively arranged on different pipelines, and control valves are arranged between each pipeline and the exhaust port of the compressor. Thus, when the compressor discharges the refrigerant, it is no longer just to give priority to passing the refrigerant through the water tank, but to control the opening and closing of the control valves based on the operating mode of the air conditioner, so as to selectively control the refrigerant discharged from the exhaust port to enter the first pipeline, the second pipeline, and / or the third pipeline, thereby while enabling the air conditioner to have multiple different operating modes, avoiding the problem of insufficient or excessive cooling or heating capacity caused by the refrigerant heating the water tank first.

[0042] In some embodiments, as Figure 1 shown, the air conditioner 100 further includes a liquid storage tank 6, a first expansion valve 7, a second expansion valve 8, and a third expansion valve 9. The control valves include a first four-way valve 10, a second four-way valve 11, and a three-way valve 12.

[0043] Among them, the outlet of the liquid storage tank 6 is connected to the intake port of the compressor 1. The first expansion valve 7 is arranged on the first pipeline, and the first expansion valve 7 is used to adjust the refrigerant flow rate in the first pipeline; the second expansion valve 8 is arranged on the second pipeline, and the second expansion valve 8 is used to adjust the refrigerant flow rate in the second pipeline; the first end of the third expansion valve 9 is connected to the end of the first pipeline and the end of the second pipeline, the second end of the third expansion valve 9 is connected to the first end of the third heat exchanger 5, and the third expansion valve 9 is used to adjust the refrigerant flow rate in the third pipeline; the D end of the first four-way valve 10 is connected to the exhaust port, the C end of the first four-way valve 10 is connected to the head end of the second pipeline, and the E end of the first four-way valve 10 and the S end of the first four-way valve 10 are connected together and then connected to the inlet of the liquid storage tank 6; the D end of the second four-way valve 11 is connected to the exhaust port, the E end of the second four-way valve 11 is connected to the end of the third pipeline, and the S end of the second four-way valve 11 is connected to the inlet of the liquid storage tank 6; the first end of the three-way valve 12 is connected to the head end of the first pipeline, the second end of the three-way valve 12 is connected to the C end of the second four-way valve 11, and the third end of the three-way valve 12 is connected to the inlet of the liquid storage tank 6.

[0044] Exemplarily, if it is determined that the operating mode of the air conditioner 100 is refrigeration but there is no hot water heating demand, the conduction states of the first four-way valve 10, the second four-way valve 11, and the three-way valve 12 are controlled so that the refrigerant discharged from the compressor 1 through the exhaust port sequentially passes through the first pipeline and the third pipeline and then enters the intake port of the compressor 1; or the operating mode of the air conditioner 100 is heating but there is no hot water heating demand. At this time, the refrigerant discharged from the compressor 1 through the exhaust port sequentially passes through the third pipeline and the first pipeline and then enters the intake port of the compressor 1; or the operating mode of the air conditioner 100 is refrigeration and there is a hot water heating demand. The conduction states of the first four-way valve 10, the second four-way valve 11, and the three-way valve 12 are controlled so that the refrigerant discharged from the compressor 1 through the exhaust port passes through the second pipeline, flows through the second heat exchanger 4 to heat the domestic water stored in the water tank 2, and then the refrigerant is split. One part passes through the first pipeline, and the other part passes through the third pipeline and finally enters the intake port of the compressor 1; or the operating mode of the air conditioner 100 is refrigeration and there is a hot water heating demand. The conduction states of the first four-way valve 10, the second four-way valve 11, and the three-way valve 12 are controlled so that the refrigerant discharged from the compressor 1 through the exhaust port passes through the second pipeline, flows through the second heat exchanger 4 to heat the domestic water stored in the water tank 2, passes through the third pipeline and then enters the intake port of the compressor 1; or the operating mode of the air conditioner 100 is refrigeration and there is a hot water heating demand. The conduction states of the first four-way valve 10, the second four-way valve 11, and the three-way valve 12 are controlled so that the refrigerant discharged from the compressor 1 through the exhaust port passes through the second pipeline, flows through the second heat exchanger 4 to heat the domestic water stored in the water tank 2, and then passes through the third pipeline and enters the intake port of the compressor 1; or the operating mode of the air conditioner 100 is refrigeration and there is a hot water heating demand. The conduction states of the first four-way valve 10, the second four-way valve 11, and the three-way valve 12 are controlled so that a part of the refrigerant discharged from the compressor 1 through the exhaust port passes through the second pipeline, flows through the second heat exchanger 4 to heat the domestic water stored in the water tank 2, and the other part passes through the first pipeline, and after confluence, enters the third pipeline and then enters the intake port of the compressor 1; or the operating mode of the air conditioner 100 only has a hot water heating demand. The conduction states of the first four-way valve 10, the second four-way valve 11, and the three-way valve 12 are controlled so that the refrigerant discharged from the compressor 1 through the exhaust port passes through the second pipeline, flows through the second heat exchanger 4 to heat the domestic water stored in the water tank 2, and then passes through the first pipeline and enters the intake port of the compressor 1; or the operating mode of the air conditioner 100 is heating and there is a hot water heating demand. The conduction states of the first four-way valve 10, the second four-way valve 11, and the three-way valve 12 are controlled so that a part of the refrigerant discharged from the compressor 1 through the exhaust port passes through the second pipeline, flows through the second heat exchanger 4 to heat the domestic water stored in the water tank 2, and the other part passes through the third pipeline, and after confluence, passes through the first pipeline and then enters the intake port of the compressor 1;If the operating mode of the air conditioner 100 has a defrosting requirement, the conduction states of the first four-way valve 10, the second four-way valve 11, and the three-way valve 12 are controlled so that after the refrigerant discharged from the compressor 1 through the exhaust port passes through the first pipeline, it returns to the exhaust port of the compressor 1 through the third pipeline or flows through the second heat exchanger 4 in the second pipeline to heat the domestic water stored in the water tank 2, and then returns to the intake port of the compressor 1. In addition, the refrigerant flow rates in the first pipeline, the second pipeline, and the third pipeline are respectively adjusted by the first expansion valve 7, the second expansion valve 8, and the third expansion valve 9, and the refrigerant flow rate is accurately distributed according to actual requirements. Thereby, while the air conditioner 100 has multiple different operating modes, the problem of insufficient or excessive cooling or heating capacity caused by the refrigerant heating the water tank first is avoided.

[0045] In the embodiment, as Figure 1 shown, the air conditioner 100 further includes an economizer 13, a second liquid storage tank 14, and a fourth expansion valve 15.

[0046] Specifically, the economizer 13 is used to adapt to the booster compressor, can improve the heating performance in a low-temperature environment, and increases the suction enthalpy value of the compressor 1 by recovering part of the energy of the refrigerant, thereby improving the heating capacity and energy efficiency ratio of the air conditioner 100. The fourth expansion valve 15 is used to adjust the refrigerant flow rate entering the economizer 13. Since the refrigerant demand is different in different modes, the second liquid storage tank 14 is provided to store the excess refrigerant to avoid air conditioner failures caused by too much or too little refrigerant. Among them, the economizer 13 can be a plate heat exchanger for heat exchange between refrigerants, or a shell-and-tube heat exchanger for heat exchange between refrigerants, and no specific limitation is made here.

[0047] In some embodiments, for controlling the conduction states of the control valves according to the operating mode of the air conditioner 100 to guide the refrigerant discharged at the exhaust port into the first pipeline, the second pipeline, and / or the third pipeline, the controller 100 is specifically configured to, when the operating mode is the cooling mode, control both the first expansion valve 7 and the third expansion valve 9 to open, control the second expansion valve 8 to close, and control the C end of the first four-way valve 10 to communicate with the S end of the first four-way valve 10, the E end of the first four-way valve 10 to communicate with the D end of the first four-way valve 10, the C end of the second four-way valve 11 to communicate with the D end of the second four-way valve 11, the E end of the second four-way valve 11 to communicate with the S end of the second four-way valve 11, and the first end of the three-way valve 12 to communicate with the second end of the three-way valve 12, so as to guide the refrigerant to enter the intake port of the compressor 1 from the exhaust port through the first pipeline and the third pipeline in sequence.

[0048] Specifically, if it is determined that the operating mode of the air conditioner 100 is the cooling mode, the first expansion valve 7 and the third expansion valve 9 are both controlled to open, the second expansion valve 8 is controlled to close, and the C end of the first four-way valve 10 is connected to the S end of the first four-way valve 10, the E end of the first four-way valve 10 is connected to the D end of the first four-way valve 10, the C end of the second four-way valve 11 is connected to the D end of the second four-way valve 11, the E end of the second four-way valve 11 is connected to the S end of the second four-way valve 11, and the first end of the three-way valve 12 is connected to the second end of the three-way valve 12. At this time, the refrigerant flow direction is referenced Figure 2 as shown. That is to say, the refrigerant discharged from the exhaust port of the compressor 1 flows into the D end of the second four-way valve 11, then flows into the second end of the three-way valve 12 through the C end of the second four-way valve 11, flows into the first heat exchanger 3 from the first end of the three-way valve 12, condenses and releases heat in the first heat exchanger 3, then passes through the first expansion valve 7, the economizer 13, the second liquid storage tank 12, and the third expansion valve 9 and enters the third heat exchanger 5. In the third heat exchanger 5, the refrigerant exchanges heat with the indoor air, that is, the refrigerant releases heat to the indoor air to achieve the cooling effect, and then flows into the C end of the first four-way valve 10, flows into the liquid storage tank 6 through the S end of the first four-way valve 10, and finally returns to the compressor 1 through the intake port of the compressor 1. Thus, the air conditioner 100 completes the cooling operation mode.

[0049] According to the configuration of the controller in the above embodiment, when the operating mode of the air conditioner 100 is the cooling mode, by controlling the first expansion valve 7, the second expansion valve 8, the third expansion valve 9, the first four-way valve 10, the second four-way valve 11, and the three-way valve 12, the effect of guiding the refrigerant flow is achieved. After the refrigerant is discharged from the exhaust port of the compressor 1, it passes through the first pipeline and the third pipeline in sequence and then enters the intake port of the compressor 1, so that the air conditioner 100 completes the cooling operation mode.

[0050] In some embodiments, for controlling the conduction of the control valve 10 according to the operating mode of the air conditioner 100 to guide the refrigerant discharged from the exhaust port into the first pipeline, the second pipeline, and / or the third pipeline, the controller is specifically configured to, when the operating mode is the heating mode, control the first expansion valve 7 and the third expansion valve 9 to both open, control the second expansion valve 8 to close, and control the C end of the first four-way valve 10 to be connected to the S end of the first four-way valve 10, the E end of the first four-way valve 10 to be connected to the D end of the first four-way valve 10, the C end of the second four-way valve 11 to be connected to the S end of the second four-way valve 11, the E end of the second four-way valve 11 to be connected to the D end of the second four-way valve 11, and the first end of the three-way valve 12 to be connected to the second end of the three-way valve 12, so as to guide the refrigerant to enter the intake port of the compressor 1 from the exhaust port through the third pipeline and the first pipeline in sequence.

[0051] Specifically, when it is determined that the operating mode of the air conditioner 100 is the heating mode, the first expansion valve 7 and the third expansion valve 9 are both controlled to open, the second expansion valve 8 is controlled to close, and the C end of the first four-way valve 10 is connected to the S end of the first four-way valve 10, the E end of the first four-way valve 10 is connected to the D end of the first four-way valve 10, the C end of the second four-way valve 11 is connected to the S end of the second four-way valve 11, the E end of the second four-way valve 11 is connected to the D end of the second four-way valve 11, and the first end of the three-way valve 12 is connected to the second end of the three-way valve 12. At this time, the refrigerant flow direction is as shown in Figure 3 That is to say, the refrigerant discharged from the exhaust port of the compressor 1 flows into the C end of the second four-way valve 11, then flows into the third heat exchanger 5 through the S end of the second four-way valve 11, and exchanges heat with the low-temperature air in the room in the third heat exchanger 5 to achieve the heating effect. Then, it passes through the third expansion valve 9, the second liquid storage tank 14, and the economizer 13. After passing through the economizer 13, a part of the refrigerant enters the first heat exchanger 3 through the first expansion valve 7, absorbs the heat in the outdoor air, then flows into the first end of the three-way valve 12, flows into the C end of the first four-way valve 10 from the second end of the three-way valve 12, flows into the liquid storage tank 6 through the S end of the first four-way valve 10, and finally returns to the compressor 1 through the intake port of the compressor 1; another part of the refrigerant returns to the economizer 13 after passing through the fourth expansion valve 15, is converted into a gas state, then flows into the compressor 1 from the economizer 13 through the air injection and enthalpy increase port of the compressor 1, and returns to the compressor 1. The heating performance of the air conditioner 100 is improved through the economizer 13, and thus the air conditioner 100 completes the heating operation mode.

[0052] According to the configuration of the controller in the above embodiment, when the operating mode of the air conditioner 100 is the heating mode, by controlling the first expansion valve 7, the second expansion valve 8, the third expansion valve 9, the first four-way valve 10, the second four-way valve 11, and the three-way valve 12, the effect of guiding the refrigerant flow is achieved. The refrigerant passes through the third pipeline and the first pipeline in sequence and then enters the intake port of the compressor 1, so that the air conditioner 100 completes the heating operation mode, and the heating performance of the air conditioner 100 is improved through the economizer 13.

[0053] In some embodiments, for controlling the opening and closing of the control valve 10 according to the operating mode of the air conditioner 100 to guide the refrigerant discharged at the exhaust port into the first pipeline, the second pipeline, and / or the third pipeline, the controller is specifically configured to control the first expansion valve 7, the second expansion valve 8, and the third expansion valve 9 to be all opened, and control the C end of the first four-way valve 10 to communicate with the D end of the first four-way valve 10, the E end of the first four-way valve 10 to communicate with the S end of the first four-way valve 10, the C end of the second four-way valve 11 to communicate with the D end of the second four-way valve 11, the E end of the second four-way valve 11 to communicate with the S end of the second four-way valve 11, and the first end of the three-way valve 12 to communicate with the third end of the three-way valve 12 when the operating mode is the simultaneous refrigeration and hot water heating mode, so as to guide the refrigerant to enter the second pipeline from the exhaust port and be split at the end of the second pipeline, so that a part of the refrigerant enters the first pipeline and another part of the refrigerant enters the third pipeline, and finally, after the refrigerant converges into the liquid storage tank 6, it enters the intake port of the compressor 1. This control method is applicable to the scenario where the hot water heating demand is higher than the refrigeration demand. That is to say, when the hot water heating demand is high, the refrigerant is controlled to preferentially enter the second pipeline where the second heat exchanger is located to heat domestic water. At the same time, considering the low refrigeration demand, to avoid the problem of excessive refrigeration caused by all the refrigerant discharged from the second pipeline entering the third pipeline, the refrigerant discharged from the second pipeline is split, that is, by controlling the opening degree of the first solenoid valve, a part of the refrigerant discharged from the second pipeline is conveyed into the first pipeline, thereby restricting the amount of refrigerant in the third pipeline, so as to ensure the user's refrigeration demand while meeting the hot water heating demand.

[0054] Specifically, if it is determined that the operating mode of the air conditioner 100 is the simultaneous refrigeration and hot water heating mode, control the first expansion valve 7, the second expansion valve 8, and the third expansion valve 9 to be all opened, and control the C end of the first four-way valve 10 to communicate with the D end of the first four-way valve 10, the E end of the first four-way valve 10 to communicate with the S end of the first four-way valve 10, the C end of the second four-way valve 11 to communicate with the D end of the second four-way valve 11, the E end of the second four-way valve 11 to communicate with the S end of the second four-way valve 11, and the first end of the three-way valve 12 to communicate with the third end of the three-way valve 12. At this time, the refrigerant flow direction reference Figure 4As shown, that is to say, the refrigerant discharged from the exhaust port of the compressor 1 flows into the C end of the first four-way valve 10, flows into the second heat exchanger 4 from the D end of the first four-way valve 10, heats the domestic water stored in the water tank 2, and then is shunted after passing through the second expansion valve 8. A part of the refrigerant enters the third heat exchanger 5 after passing through the third expansion valve 9. In the third heat exchanger 5, the refrigerant exchanges heat with the indoor air, that is, the refrigerant releases heat to the indoor air to achieve the refrigeration effect, and then flows into the E end of the second four-way valve 11 and flows out from the S end of the second four-way valve 11. Another part of the refrigerant enters the first heat exchanger 3 for condensation and heat dissipation after passing through the first expansion valve 7, then flows into the first end of the three-way valve 12 and flows out from the third end of the three-way valve 12. The two parts of the refrigerant converge and enter the liquid storage tank 6, and finally return to the compressor 1 through the intake port of the compressor 1. Thus, the air conditioner 100 completes the simultaneous refrigeration and hot water production operation mode.

[0055] According to the configuration of the controller in the above embodiment, when the operation mode of the air conditioner 100 is the heating mode, by controlling the first expansion valve 7, the second expansion valve 8, the third expansion valve 9, the first four-way valve 10, the second four-way valve 11 and the three-way valve 12, the effect of guiding the flow of the refrigerant is achieved. The refrigerant enters the second pipeline from the exhaust port and is shunted at the end of the second pipeline, so that a part of the refrigerant enters the first pipeline and another part of the refrigerant enters the third pipeline. Finally, after the refrigerant converges into the liquid storage tank, it enters the intake port of the compressor, so that the air conditioner 100 completes the simultaneous refrigeration and hot water production operation mode.

[0056] In some embodiments, for controlling the conduction of the control valve 10 according to the operation mode of the air conditioner 100 to guide the refrigerant discharged at the exhaust port into the first pipeline, the second pipeline and / or the third pipeline, the controller is specifically configured to, when the operation mode is the simultaneous refrigeration and hot water production mode, control both the second expansion valve 8 and the third expansion valve 9 to be opened, control the first expansion valve 7 to be closed, and control the C end of the first four-way valve 10 to be communicated with the D end of the first four-way valve 10, the E end of the first four-way valve 10 to be communicated with the S end of the first four-way valve 10, the C end of the second four-way valve 11 to be communicated with the D end of the second four-way valve 11, the E end of the second four-way valve 11 to be communicated with the S end of the second four-way valve 11, and the first end of the three-way valve 12 to be communicated with the second end of the three-way valve 12, so as to guide the refrigerant to enter the intake port of the compressor 1 from the exhaust port through the second pipeline and the third pipeline in sequence. This control method is applicable to the scenario where the hot water production demand is similar to the refrigeration demand, thereby realizing the full recovery of waste heat, improving the overall energy utilization rate of the air conditioning system, and reducing the power consumption of the air conditioner.

[0057] Specifically, when it is determined that the operating mode of the air conditioner 100 is the simultaneous refrigeration and hot water production mode, the second expansion valve 8 and the third expansion valve 9 are both controlled to open, the first expansion valve 7 is controlled to close, and the C end of the first four-way valve 10 is connected to the D end of the first four-way valve 10, the E end of the first four-way valve 10 is connected to the S end of the first four-way valve 10, the C end of the second four-way valve 11 is connected to the D end of the second four-way valve 11, the E end of the second four-way valve 11 is connected to the S end of the second four-way valve 11, and the first end of the three-way valve 12 is connected to the second end of the three-way valve 12. At this time, the refrigerant flow direction is referred to Figure 5 as shown. That is to say, the refrigerant discharged from the exhaust port of the compressor 1 flows into the C end of the first four-way valve 10, flows into the second heat exchanger 4 through the D end of the first four-way valve 10, heats the domestic water stored in the water tank 2, then flows through the second expansion valve 8 and into the third expansion valve 9, and then enters the third heat exchanger 5. In the third heat exchanger 5, the refrigerant exchanges heat with the indoor air, that is, the refrigerant releases heat to the indoor air to achieve the refrigeration effect, then flows into the E end of the second four-way valve 11, flows out from the S end of the second four-way valve 11 and enters the liquid storage tank 6, and finally returns to the compressor 1 through the intake port of the compressor 1. Thus, the air conditioner 100 completes the simultaneous refrigeration and hot water production operating mode.

[0058] According to the configuration of the controller in the above embodiment, when the operating mode of the air conditioner 100 is the simultaneous refrigeration and hot water production mode, by controlling the first expansion valve 7, the second expansion valve 8, the third expansion valve 9, the first four-way valve 10, the second four-way valve 11 and the three-way valve 12, the effect of guiding the refrigerant flow is achieved. The refrigerant sequentially passes through the second pipeline and the third pipeline from the exhaust port and then enters the intake port of the compressor 1. Thus, the air conditioner 100 completes the simultaneous refrigeration and hot water production operating mode.

[0059] In some embodiments, for controlling the opening and closing of the control valve 10 according to the operating mode of the air conditioner 100 to guide the refrigerant discharged at the exhaust port into the first pipeline, the second pipeline, and / or the third pipeline, the controller is specifically configured to control the first expansion valve 7, the second expansion valve 8, and the third expansion valve 9 to be all opened, and control the C end of the first four-way valve 10 to be communicated with the D end of the first four-way valve 10, the E end of the first four-way valve 10 to be communicated with the S end of the first four-way valve 10, the C end of the second four-way valve 11 to be communicated with the D end of the second four-way valve 11, the E end of the second four-way valve 11 to be communicated with the S end of the second four-way valve 11, and the first end of the three-way valve 12 to be communicated with the second end of the three-way valve 12 when the operating mode is the simultaneous refrigeration and hot water heating mode, so as to guide a part of the refrigerant into the first pipeline and another part of the refrigerant into the second pipeline, and after the refrigerant converges into the third pipeline, it enters the intake port of the compressor 1. This control method is applicable to the scenario where the hot water heating demand is lower than the refrigeration demand. That is to say, when the hot water heating demand is lower than the refrigeration demand, the refrigerant is controlled to be branched at the exhaust port, and a part of it enters the second pipeline where the second heat exchanger is located, thereby restricting the amount of refrigerant in the second pipeline to heat domestic water. At the same time, considering the high refrigeration demand, another part of the refrigerant enters the first pipeline, and then the refrigerant in the first pipeline and the refrigerant in the second pipeline converge into the third pipeline to ensure the refrigeration demand of the user.

[0060] Specifically, if it is determined that the operating mode of the air conditioner 100 is the simultaneous refrigeration and hot water heating mode, control the first expansion valve 7, the second expansion valve 8, and the third expansion valve 9 to be all opened, and control the C end of the first four-way valve 10 to be communicated with the D end of the first four-way valve 10, the E end of the first four-way valve 10 to be communicated with the S end of the first four-way valve 10, the C end of the second four-way valve 11 to be communicated with the D end of the second four-way valve 11, the E end of the second four-way valve 11 to be communicated with the S end of the second four-way valve 11, and the first end of the three-way valve 12 to be communicated with the second end of the three-way valve 12. At this time, the refrigerant flow direction reference Figure 6As shown, that is to say, a part of the refrigerant discharged from the exhaust port of the compressor 1 flows into the D end of the second four-way valve 11, then flows into the second end of the three-way valve 12 through the C end of the second four-way valve 11, flows into the first heat exchanger 3 from the first end of the three-way valve 12, condenses and releases heat in the first heat exchanger 3, and then passes through the first expansion valve 7; another part of the refrigerant flows into the C end of the first four-way valve 10, flows into the second heat exchanger 4 through the D end of the first four-way valve 10, heats the domestic water stored in the water tank 2, and then the two parts of the refrigerant converge after passing through the second expansion valve 8, and then enter the third heat exchanger 5, where the refrigerant exchanges heat with the indoor air, that is, the refrigerant releases heat to the indoor air to achieve the refrigeration effect, then flows into the E end of the second four-way valve 11, flows out from the S end of the second four-way valve 11 and enters the liquid storage tank 6, and finally returns to the compressor 1 through the intake port of the compressor 1, thus completing the simultaneous refrigeration and hot water production operation mode of the air conditioner 100.

[0061] According to the configuration of the controller in the above embodiment, when the operation mode of the air conditioner 100 is the simultaneous refrigeration and hot water production mode, by controlling the first expansion valve 7, the second expansion valve 8, the third expansion valve 9, the first four-way valve 10, the second four-way valve 11 and the three-way valve 12, the effect of guiding the flow of the refrigerant is achieved. A part of the refrigerant enters the first pipeline, and another part of the refrigerant is guided into the second pipeline, and after the refrigerant converges into the third pipeline, it enters the intake port of the compressor 1, so as to realize the simultaneous refrigeration and hot water production operation mode of the air conditioner 100.

[0062] In some embodiments, for controlling the conduction of the control valve 10 according to the operation mode of the air conditioner 100 to guide the refrigerant discharged from the exhaust port into the first pipeline, the second pipeline and / or the third pipeline, the controller is specifically configured to, when the operation mode is the hot water production mode, control both the first expansion valve 7 and the second expansion valve 8 to be opened, control the third expansion valve 9 to be closed, and control the C end of the first four-way valve to be communicated with the D end of the first four-way valve, the E end of the first four-way valve to be communicated with the S end of the first four-way valve, the C end of the second four-way valve to be communicated with the D end of the second four-way valve, the E end of the second four-way valve to be communicated with the S end of the second four-way valve, and the first end of the three-way valve to be communicated with the third end of the three-way valve, so as to guide the refrigerant to enter the intake port of the compressor 1 from the exhaust port through the second pipeline and the first pipeline in sequence.

[0063] Specifically, when it is determined that the operating mode of the air conditioner 100 is the hot water heating mode, the first expansion valve and the second expansion valve are both controlled to open, the third expansion valve is controlled to close, and the C end of the first four-way valve is connected to the D end of the first four-way valve, the E end of the first four-way valve is connected to the S end of the first four-way valve, the C end of the second four-way valve is connected to the D end of the second four-way valve, the E end of the second four-way valve is connected to the S end of the second four-way valve, and the first end of the three-way valve is connected to the third end of the three-way valve. At this time, the refrigerant flow direction is as shown in Figure 7 That is to say, the refrigerant discharged from the exhaust port of the compressor 1 flows into the C end of the first four-way valve 10, flows into the second heat exchanger 4 through the D end of the first four-way valve 10, heats the domestic water stored in the water tank 2, then flows through the second expansion valve 8 and the first expansion valve 7 and then into the first heat exchanger 3 to absorb heat from the outdoor air, then flows into the first end of the three-way valve 12, flows into the C end of the first four-way valve 10 from the second end of the three-way valve 12, flows into the liquid storage tank 6 through the S end of the first four-way valve 10, and finally returns to the compressor 1 through the intake port of the compressor 1. Thus, the air conditioner 100 completes the hot water heating operation mode.

[0064] According to the configuration of the controller in the above embodiment, when the operating mode of the air conditioner 100 is the hot water heating mode, by controlling the first expansion valve 7, the second expansion valve 8, the third expansion valve 9, the first four-way valve 10, the second four-way valve 11 and the three-way valve 12, the effect of guiding the refrigerant flow is achieved. The refrigerant enters the intake port of the compressor 1 from the exhaust port through the second pipeline and the first pipeline in sequence, so that the air conditioner 100 completes the hot water heating operation mode.

[0065] In some embodiments, for controlling the conduction of the control valve 10 according to the operating mode of the air conditioner 100 to guide the refrigerant discharged from the exhaust port into the first pipeline, the second pipeline and / or the third pipeline, the controller is specifically configured to, when the operating mode is the simultaneous heating and hot water heating mode, control the first expansion valve 7, the second expansion valve 8 and the third expansion valve 9 to open, and control the C end of the first four-way valve 10 to be connected to the D end of the first four-way valve 10, the E end of the first four-way valve 10 to be connected to the S end of the first four-way valve 10, the C end of the second four-way valve 11 to be connected to the S end of the second four-way valve 11, the E end of the second four-way valve 11 to be connected to the D end of the second four-way valve 11, and the first end of the three-way valve 12 to be connected to the second end of the three-way valve 12, so as to guide a part of the refrigerant into the third pipeline and another part of the refrigerant into the second pipeline, and then enter the intake port of the compressor 1 after the refrigerant converges into the first pipeline.

[0066] Specifically, when it is determined that the operating mode of the air conditioner 100 is the simultaneous heating and hot water mode, control the first expansion valve 7, the second expansion valve 8, and the third expansion valve 9 to all open, and control the C end of the first four-way valve 10 to communicate with the D end of the first four-way valve 10, the E end of the first four-way valve 10 to communicate with the S end of the first four-way valve 10, the C end of the second four-way valve 11 to communicate with the S end of the second four-way valve 11, the E end of the second four-way valve 11 to communicate with the D end of the second four-way valve 11, and the first end of the three-way valve 12 to communicate with the second end of the three-way valve 12. At this time, the refrigerant flow direction is as shown in Figure 8 That is to say, a part of the refrigerant discharged from the exhaust port of the compressor 1 flows into the C end of the second four-way valve 11, and then flows into the third heat exchanger 5 through the S end of the second four-way valve 11, where it exchanges heat with the low-temperature air in the room to achieve the heating effect, and then passes through the third expansion valve 9, the second liquid storage tank 12, and the economizer 13; another part of the refrigerant flows into the C end of the first four-way valve 10, flows into the second heat exchanger 4 through the D end of the first four-way valve 10, heats the domestic water stored in the water tank 2, and then passes through the second expansion valve 8. After the two parts of the refrigerant converge, they enter the E end of the second four-way valve 11 through the first expansion valve 7, flow out from the D end of the second four-way valve 11 to the liquid storage tank 6, and finally return to the compressor 1 through the intake port of the compressor 1. Among them, after the refrigerant flows through the economizer 13, a part of the refrigerant passes through the first expansion valve 7; another part of the refrigerant passes through the fourth expansion valve 15 and then returns to the economizer 13, where it is converted into a gas state, and then flows from the economizer 13 into the gas injection and enthalpy increase port of the compressor 1 and returns to the compressor 1, thereby improving the heating performance of the air conditioner 100 through the economizer 13. Thus, the air conditioner 100 completes the simultaneous heating and hot water operation mode.

[0067] According to the configuration of the controller in the above embodiment, when the operating mode of the air conditioner 100 is the simultaneous heating and hot water operation mode, by controlling the first expansion valve 7, the second expansion valve 8, the third expansion valve 9, the first four-way valve 10, the second four-way valve 11, and the three-way valve 12, the effect of guiding the refrigerant flow is achieved. A part of the refrigerant enters the third pipeline, and another part of the refrigerant is guided into the second pipeline, and after the refrigerant converges into the first pipeline, it enters the intake port of the compressor 1, so that the air conditioner 100 completes the simultaneous heating and hot water operation mode.

[0068] In some embodiments, for controlling the opening and closing of the control valve 10 according to the operating mode of the air conditioner 100 to guide the refrigerant discharged at the exhaust port into the first pipeline, the second pipeline, and / or the third pipeline, the controller is specifically configured to, when the operating mode is the defrosting mode, control both the first expansion valve 7 and the third expansion valve 9 to open, control the second expansion valve 8 to close, and control the C end of the first four-way valve 10 to communicate with the S end of the first four-way valve 10, the E end of the first four-way valve 10 to communicate with the D end of the first four-way valve 10, the C end of the second four-way valve 11 to communicate with the D end of the second four-way valve 11, the E end of the second four-way valve 11 to communicate with the S end of the second four-way valve 11, and the first end of the three-way valve 12 to communicate with the second end of the three-way valve 12, so as to guide the refrigerant to enter the intake port of the compressor 1 from the exhaust port through the first pipeline and the third pipeline in sequence; or, when the operating mode is the defrosting mode, control both the first expansion valve 7 and the second expansion valve 8 to open, control the third expansion valve 9 to close, and control the C end of the first four-way valve 10 to communicate with the S end of the first four-way valve 10, the E end of the first four-way valve 10 to communicate with the D end of the first four-way valve 10, the C end of the second four-way valve 11 to communicate with the D end of the second four-way valve 11, the E end of the second four-way valve 11 to communicate with the S end of the second four-way valve 11, and the first end of the three-way valve 12 to communicate with the second end of the three-way valve 12, so as to guide the refrigerant to enter the intake port of the compressor 1 from the exhaust port through the first pipeline and the second pipeline in sequence.

[0069] Specifically, if it is determined that the operating mode of the air conditioner 100 is defrosting, control the second expansion valve 8 to close, and control the C end of the first four-way valve 10 to communicate with the S end of the first four-way valve 10, the E end of the first four-way valve 10 to communicate with the D end of the first four-way valve 10, the C end of the second four-way valve 11 to communicate with the D end of the second four-way valve 11, the E end of the second four-way valve 11 to communicate with the S end of the second four-way valve 11, and the first end of the three-way valve 12 to communicate with the second end of the three-way valve 12. At this time, the refrigerant flow direction is as shown in Figure 2 That is to say, the refrigerant discharged from the exhaust port of the compressor 1 flows into the D end of the second four-way valve 11, then flows into the second end of the three-way valve 12 through the C end of the second four-way valve 11, flows into the first heat exchanger 3 from the first end of the three-way valve 12, condenses and releases heat in the first heat exchanger 3, and then enters the third heat exchanger 5 after passing through the first expansion valve 7, the economizer 13, the second liquid storage tank 12, and the third expansion valve 9. In the third heat exchanger 5, the refrigerant exchanges heat with the indoor air, that is, the refrigerant releases heat to the indoor air to achieve the defrosting effect, and then flows into the C end of the first four-way valve 10, flows into the liquid storage tank 6 through the S end of the first four-way valve 10, and finally returns to the compressor 1 through the intake port of the compressor 1; Alternatively, control the first expansion valve 7 and the second expansion valve 8 to be both open, control the third expansion valve 9 to be closed, and control the C port of the first four-way valve 10 to communicate with the S port of the first four-way valve 10, the E port of the first four-way valve 10 to communicate with the D port of the first four-way valve 10, the C port of the second four-way valve 11 to communicate with the D port of the second four-way valve 11, the E port of the second four-way valve 11 to communicate with the S port of the second four-way valve 11, and the first end of the three-way valve 12 to communicate with the second end of the three-way valve 12. At this time, the refrigerant flow direction reference Figure 9 is shown. The refrigerant discharged from the exhaust port of the compressor 1 flows into the D port of the second four-way valve 11, then flows into the second end of the three-way valve 12 through the C port of the second four-way valve 11, flows into the first heat exchanger 3 from the first end of the three-way valve 12, condenses and releases heat in the first heat exchanger 3, then flows through the first expansion valve 7 and the second expansion valve 8 and then into the second heat exchanger 4 to heat the domestic water stored in the water tank 2, then flows into the C port of the first four-way valve 10, flows into the liquid storage tank 6 from the S port of the first four-way valve 10, and finally returns to the compressor 1 through the intake port of the compressor 1. Thus, the air conditioner 100 completes the defrosting operation mode.

[0070] According to the configuration of the controller in the above embodiment, when the operation mode of the air conditioner 100 is the defrosting mode, by controlling the first expansion valve 7, the second expansion valve 8, the third expansion valve 9, the first four-way valve 10, the second four-way valve 11 and the three-way valve 12, the effect of guiding the refrigerant flow is achieved. The refrigerant enters the intake port of the compressor 1 from the exhaust port through the first pipeline and the third pipeline in sequence; or the refrigerant enters the intake port of the compressor 1 from the exhaust port through the first pipeline and the second pipeline in sequence, so that the air conditioner 100 completes the defrosting operation mode.

[0071] In some embodiments, based on the above architecture, with reference to Figure 10 shown, the controller of the air conditioner is configured to execute the following steps S1 - step S5.

[0072] Step S1, obtain the heat exchange temperature of the third heat exchanger and the water tank temperature.

[0073] Specifically, temperature sensors can be set between the second heat exchanger 4 and the water tank 2 to monitor the water tank temperature and send the obtained water tank temperature to the controller. And, the third heat exchanger can be a plate heat exchanger, and the heat exchange temperature is determined by detecting the temperature at the outlet of the plate heat exchanger.

[0074] Step S2, determine the heat recovery state required by the air conditioner according to the water tank temperature.

[0075] Specifically, the heat recovery of the air conditioner 100 utilizes the waste heat generated during the operation of the air conditioner 100 for recovery, which is used to heat the domestic water in the water tank 2 or for other waste heat utilization. The heat recovery state required by the air conditioner 100 is determined according to the water tank temperature, that is, the amount of waste heat to be recovered for heating the water in the water tank is determined according to the water tank temperature. If the water tank temperature is relatively low, more waste heat is required to heat the water in the water tank 2 at this time, then the heat recovery state required by the air conditioner 100 is determined to be full heat recovery, so as to maximize the recovery and utilization of waste heat and improve the heating efficiency; if the water tank temperature is moderate, partial waste heat is still required to heat the water in the water tank 2 at this time, then the heat recovery state required by the air conditioner 100 is determined to be partial heat recovery, so as to provide appropriate waste heat for heating the water tank 2, thereby ensuring both the heating efficiency and avoiding unnecessary energy waste. Thus, the air conditioner 100 in the present application can dynamically adjust the heat recovery state required by the air conditioner according to the water tank temperature, so as to select an appropriate heat recovery state in combination with the water tank temperature, which can not only ensure that the water in the water tank 2 reaches the required temperature, but also optimize the operating efficiency of the air conditioning system and reduce unnecessary energy consumption.

[0076] Step S3: Determine the refrigeration state of the air conditioner according to the heat exchange temperature.

[0077] Specifically, when the third heat exchanger 5 is refrigerating, the refrigerant flowing inside exchanges heat with the indoor air, so that the temperature of the refrigerant increases. The third heat exchanger 5 uses the waste heat generated by refrigeration to heat the domestic water in the water tank. At this time, the high-temperature refrigerant exchanges heat with the water discharged from the third heat exchanger 5 to increase the outlet water temperature of the water discharged from the third heat exchanger 5. On the contrary, if the third heat exchanger 5 does not refrigerate, the outlet water temperature of the third heat exchanger 5 cannot be increased. Based on this, the refrigeration state of the air conditioner 100 is determined by the outlet water temperature of the third heat exchanger 5, that is, whether the air conditioner 100 is refrigerating is determined by the outlet water temperature of the third heat exchanger 5. For example, if the outlet water temperature is higher than the refrigeration temperature threshold for determining the refrigeration of the air conditioner 100, then the refrigeration state of the air conditioner 100 is determined to be refrigeration; if the outlet water temperature is lower than the refrigeration temperature threshold for determining the refrigeration of the air conditioner 100, then the refrigeration state of the air conditioner 100 is determined to be non-refrigeration.

[0078] Step S4: Control the conduction conditions of the first four-way valve, the second four-way valve, and the three-way valve according to the heat recovery state and the refrigeration state.

[0079] Specifically, to solve this problem, in this application, the required heat recovery state of the air conditioner 100 is determined according to the water tank temperature, that is, the waste heat required to heat the domestic water in the water tank is determined according to the water tank temperature, and according to the refrigeration state of the air conditioner, so as to control the conduction of the first four-way valve 10, the second four-way valve 11, and the three-way valve 12 for different heat recovery states and refrigeration states, thereby changing the flow path of the refrigerant in the air conditioner 100, so that all or part of the refrigerant discharged from the compressor 1 flows into the second pipeline, and thus can pass through the second heat exchanger 4 to heat the domestic water, so as to fully or partially recover the waste heat generated by the air conditioner 100 to heat the domestic water, so as to meet the heating demand of the domestic water in the water tank, and at the same time meet the user's demand for refrigeration or non-refrigeration. Therefore, compared with the existing air conditioner using a scheme of two series-connected four-way valves and two one-way valves, or a scheme of one four-way valve and four one-way valves to achieve full recovery of waste heat, the scheme of the first four-way valve 10, the second four-way valve 11, and the three-way valve 12 is adopted in this application to more accurately distribute the refrigerant flow in the air conditioner 100, so that the air conditioner 100 can not only achieve full recovery of waste heat, but also achieve partial recovery of waste heat, improve the overall energy utilization rate of the air conditioning system, reduce the power consumption of the air conditioner 100, and thus achieve the purpose of saving electricity bills.

[0080] Exemplarily, if it is determined that the required heat recovery state of the air conditioner 100 is full heat recovery, and the refrigeration state of the air conditioner 100 is non-refrigeration, then by controlling the conduction of the first four-way valve 10, the second four-way valve 11, and the three-way valve 12, so that all the refrigerant discharged from the compressor 1 flows into the second pipeline and then flows back to the compressor 1 through the third pipeline, or, the required heat recovery state of the air conditioner 100 is full heat recovery, and the refrigeration state of the air conditioner 100 is refrigeration, at this time, the refrigerant discharged from the exhaust port of the compressor 1 is guided to flow into the third pipeline after passing through the second pipeline; or, if it is determined that the required heat recovery state of the air conditioner 100 is partial heat recovery, and the refrigeration state of the air conditioner 100 is non-refrigeration, then by controlling the conduction of the first four-way valve 10, the second four-way valve 11, and the three-way valve 12, so that a part of the refrigerant discharged from the compressor 1 flows into the second pipeline, so that another part of the refrigerant discharged from the compressor 1 flows into the third pipeline; or, the required heat recovery state of the air conditioner 100 is partial heat recovery, and the refrigeration state of the air conditioner 100 is refrigeration, at this time, the refrigerant discharged from the exhaust port of the compressor 1 is guided to flow into the third pipeline after passing through the first pipeline and the second pipeline, thereby realizing full heat recovery and partial heat recovery, improving the overall energy utilization rate of the air conditioning system, reducing the power consumption of the air conditioner 100, and thus achieving the purpose of saving electricity bills.

[0081] According to the air conditioner 100 of an embodiment of the present invention, by means of the heat recovery state, i.e., the waste heat required to heat the domestic water in the water tank 2, and the refrigeration state, the conduction conditions of the first four-way valve 10, the second four-way valve 11, and the three-way valve 12 are controlled, so as to fully recover or partially recover the waste heat generated by the air conditioner 100 to heat the domestic water. Therefore, in this application, the first four-way valve 10, the second four-way valve 11, the three-way valve 12, the first pipeline, the second pipeline, and the third pipeline are adopted to more accurately distribute the flow rate of the cooler in the air conditioner 100, so that the air conditioner 100 can not only fully recover the waste heat, but also partially recover the waste heat, improve the comprehensive energy utilization rate of the air conditioning system, reduce the power consumption of the air conditioner 100, and thus achieve the purpose of saving electricity bills.

[0082] In some embodiments, for determining the heat recovery state required by the air conditioner 100 according to the water tank temperature, the controller is specifically configured to determine that the heat recovery state required by the air conditioner 100 is the full heat recovery state if the water tank temperature is less than the first preset temperature threshold; determine that the heat recovery state required by the air conditioner 100 is the partial heat recovery state if the water tank temperature is greater than or equal to the first preset temperature threshold and less than or equal to the second preset temperature threshold; and determine that the heat recovery state required by the air conditioner 100 is the stop heat recovery state if the water tank temperature is greater than the second preset temperature threshold.

[0083] Among them, the temperature preset threshold is a temperature critical value preset for controlling the heat recovery state required by the air conditioner 100. The first temperature preset threshold and the second temperature preset threshold can be set according to actual situations and are not specifically limited here. Among them, the first temperature preset threshold can be 45°C, and the second temperature preset threshold can be 55°C.

[0084] Specifically, if the water tank temperature is less than the first preset temperature threshold, at this time, more waste heat is needed to heat the water in the water tank 2, then it is determined that the heat recovery state required by the air conditioner 100 is the full heat recovery state, that is, all the waste heat generated by the air conditioner 100 is allocated to the water tank 2; if the water tank temperature is greater than or equal to the first preset temperature threshold and less than or equal to the second preset temperature threshold, at this time, some waste heat is still needed to heat the water in the water tank 2, then it is determined that the heat recovery state required by the air conditioner 100 is the partial heat recovery state, that is, part of the waste heat generated by the air conditioner 100 is allocated to the water tank 2; if the water tank temperature is greater than the second preset temperature threshold, at this time, no waste heat is needed to heat the water in the water tank 2, then it is determined that the heat recovery state required by the air conditioner 100 is the stop heat recovery state.

[0085] Exemplarily, when determining the heat recovery state required by the air conditioner 100 according to the water tank temperature, the specific process of the controller includes the following steps.

[0086] Step S5: Determine whether the water tank temperature is less than the first preset temperature threshold. If so, execute Step S6; if not, execute Step S7.

[0087] Step S6: The heat recovery state required by the air conditioner is the full heat recovery state.

[0088] Step S7: Determine whether the water tank temperature is greater than the second preset temperature threshold. If so, execute Step S8; if not, execute Step S9.

[0089] Step S8: The heat recovery state required by the air conditioner is the partial heat recovery state.

[0090] Step S9: The heat recovery state required by the air conditioner is the stop heat recovery state.

[0091] In some embodiments, for determining the refrigeration state of the air conditioner 100 according to the heat exchange temperature of the third heat exchanger 5, the controller is specifically configured to determine that the refrigeration state is non-refrigerating if the heat exchange temperature is less than the third preset temperature threshold; and determine that the refrigeration state is refrigerating if the heat exchange temperature is greater than or equal to the third preset temperature threshold.

[0092] Exemplarily, for determining the refrigeration state of the air conditioner according to the water outlet temperature, the specific process of the controller includes the following steps.

[0093] Step S10: Determine whether the heat exchange temperature is less than the third preset temperature threshold. If so, execute Step S11; if not, execute Step S12.

[0094] Step S11: The refrigeration state of the air conditioner is non-refrigerating.

[0095] Step S12: The refrigeration state of the air conditioner is refrigerating.

[0096] In some embodiments, as Figure 11 shown, the air conditioner 100 further includes a first expansion valve 7, a second expansion valve 8, and a third expansion valve 9.

[0097] Among them, the first expansion valve 7 is arranged on the first pipeline, the second expansion valve 8 is arranged on the second pipeline, and the third expansion valve 9 is arranged on the third pipeline. For controlling the conduction conditions of the first four-way valve 10, the second four-way valve 11, and the three-way valve 12 according to the heat recovery state and the refrigeration state, the controller is specifically configured to control the D end and the C end of the first four-way valve 10 to be connected, the D end and the E end of the second four-way valve 11 to be connected, the C end and the S end of the second four-way valve 11 to be connected, the first end and the second end of the three-way valve 12 to be connected, the first expansion valve 7 to be conducted and in the fully open state, the second expansion valve 8 to be conducted, and the third expansion valve 9 to be closed under the conditions that the heat recovery state is the full heat recovery state or the partial heat recovery state and the refrigeration state is non-refrigerating.

[0098] Specifically, if it is determined that the heat recovery state required by the air conditioner 100 is the total heat recovery state and the cooling state of the air conditioner 100 is non-cooling, or if it is determined that the heat recovery state required by the air conditioner 100 is the partial heat recovery state and the cooling state of the air conditioner 100 is non-cooling, then control the D end of the first four-way valve 10 to communicate with the C end of the first four-way valve 10, the D end of the second four-way valve 11 to communicate with the E end of the second four-way valve 11, the C end of the second four-way valve 11 to communicate with the S end of the second four-way valve 11, the first end of the three-way valve 12 to communicate with the second end of the three-way valve 12, the first expansion valve 7 to be turned on and in the fully open state, the second expansion valve 8 to be turned on, and the third expansion valve 9 to be closed. At this time, the refrigerant flow direction is as shown in Figure 6 shown. That is to say, the refrigerant discharged from the exhaust port of the compressor 1 flows into the D end of the first four-way valve 10, and then flows into the second heat exchanger 4 through the C end of the first four-way valve 10. That is, all the refrigerant discharged from the exhaust port of the compressor 1 flows into the second heat exchanger 4, and the refrigerant flowing into the second heat exchanger 4 is high-temperature refrigerant. The high-temperature refrigerant exchanges heat with the domestic water in the water tank 2. At this time, the second heat exchanger 4 uses the heat of all the refrigerant to heat the domestic water in the water tank 2. The heat-exchanged refrigerant flows into the second expansion valve 8 through the fourth end of the second heat exchanger 4 to adjust the flow rate of the refrigerant flowing out of the second heat exchanger 4 to reduce the temperature of the refrigerant. Then, the throttled and depressurized refrigerant flows into the first heat exchanger 3 through the first expansion valve 7 in the fully open state. The first heat exchanger 3 exchanges heat between the refrigerant and the outdoor air, that is, the refrigerant releases heat to the outdoor air to further reduce the temperature of the refrigerant. The heat-exchanged refrigerant flows into the first end of the three-way valve 12 through the first end of the first heat exchanger 3, and then flows back to the compressor 1 through the intake port of the compressor 1 after passing through the third end of the three-way valve 12. Thus, the air conditioner 100 realizes the full recovery or partial recovery of waste heat in the non-cooling state.

[0099] In some embodiments, for controlling the conduction conditions of the first four-way valve 10, the second four-way valve 11, and the three-way valve 12 according to the heat recovery state and the cooling state, the controller is specifically configured to control the D end of the first four-way valve 10 to communicate with the C end of the first four-way valve 10, the E end of the first four-way valve 10 to communicate with the S end of the first four-way valve 10, the D end of the second four-way valve 11 to communicate with the C end of the second four-way valve 11, the E end of the second four-way valve 11 to communicate with the S end of the second four-way valve 11, the three-way valve 12 to be cut off, the first expansion valve 7 to be closed, the second expansion valve 8 to be turned on, and the third expansion valve 9 to be turned on under the condition that the heat recovery state is the total heat recovery state and the cooling state is cooling.

[0100] Specifically, if it is determined that the heat recovery state required by the air conditioner 100 is the total heat recovery state and the refrigeration state of the air conditioner 100 is refrigeration, control the D end of the first four-way valve 10 to communicate with the C end of the first four-way valve 10, the E end of the first four-way valve 10 to communicate with the S end of the first four-way valve 10, the D end of the second four-way valve 11 to communicate with the C end of the second four-way valve 11, the E end of the second four-way valve 11 to communicate with the S end of the second four-way valve 11, the three-way valve 12 to be cut off, the first expansion valve 7 to be closed, the second expansion valve 8 to be opened, and the third expansion valve 9 to be opened. At this time, the refrigerant flow direction is as shown in Figure 12 That is to say, the refrigerant discharged from the exhaust port of the compressor 1 flows into the D end of the first four-way valve 10, and then flows into the second heat exchanger 4 through the C end of the first four-way valve 10. That is, all the refrigerant discharged from the exhaust port of the compressor 1 flows into the second heat exchanger 4, and the refrigerant flowing into the second heat exchanger 4 is high-temperature refrigerant. The high-temperature refrigerant exchanges heat with the domestic water in the water tank 2. At this time, the second heat exchanger 4 uses all the heat of the refrigerant to heat the domestic water in the water tank 2, that is, the heat recovery state required by the air conditioner 100 is in the total heat recovery state. The heat-exchanged refrigerant flows into the second expansion valve 8 through the fourth end of the second heat exchanger 4 to adjust the flow rate of the refrigerant flowing out of the second heat exchanger 4 to reduce the temperature of the refrigerant. Then, the throttled and depressurized refrigerant flows into the third expansion valve 9. After being throttled and depressurized by the third expansion valve 9, the refrigerant further reduces the temperature of the refrigerant. Then, it flows into the third heat exchanger 5 through the second end of the third expansion valve 9. The refrigerant flowing in the third heat exchanger 5 exchanges heat with the indoor air to absorb the indoor heat to reduce the indoor temperature. That is, the third heat exchanger 5 absorbs heat. At this time, the air conditioner 100 operates in the refrigeration mode. Then, the heat-exchanged refrigerant flows into the E end of the second four-way valve 11 through the first end of the third heat exchanger 5, and then flows back to the compressor 1 through the S end of the second four-way valve 11 and the intake port of the compressor 1. Thus, the air conditioner 100 realizes the full recovery of waste heat under the condition of refrigeration.

[0101] In some embodiments, for controlling the conduction conditions of the first four-way valve 10, the second four-way valve 11, and the three-way valve 12 according to the heat recovery state and the refrigeration state, the controller is specifically configured to control the D end of the first four-way valve 10 to communicate with the C end of the first four-way valve 10, the E end of the first four-way valve 10 to communicate with the S end of the first four-way valve 10, the D end of the second four-way valve 11 to communicate with the C end of the second four-way valve 11, the E end of the second four-way valve 11 to communicate with the S end of the second four-way valve 11, the first end of the three-way valve 12 to communicate with the second end of the three-way valve 12, the first expansion valve 7 to be opened and in the fully open state, the second expansion valve 8 to be opened, and the third expansion valve 9 to be opened under the condition that the heat recovery state is the partial heat recovery state and the refrigeration state is refrigeration.

[0102] Specifically, if it is determined that the heat recovery state required by the air conditioner 100 is a partial heat recovery state, and the refrigeration state of the air conditioner 100 is refrigeration, control the D end of the first four-way valve 10 to communicate with the C end of the first four-way valve 10, the E end of the first four-way valve 10 to communicate with the S end of the first four-way valve 10, the D end of the second four-way valve 11 to communicate with the C end of the second four-way valve 11, the E end of the second four-way valve 11 to communicate with the S end of the second four-way valve 11, the first end of the three-way valve 12 to communicate with the second end of the three-way valve 12, the first expansion valve 7 to conduct and be in a fully open state, the second expansion valve 8 to conduct, and the third expansion valve 9 to conduct. At this time, the refrigerant flow direction is referred to Figure 13 as shown. That is to say, part of the refrigerant discharged from the exhaust port of the compressor 1 flows into the D end of the second four-way valve 11, then flows into the second end of the three-way valve 12 through the C end of the second four-way valve 11, and then flows into the first heat exchanger 3 through the first end of the three-way valve 12. The first heat exchanger 3 exchanges heat between the refrigerant and the outdoor air, that is, the refrigerant releases heat to the outdoor air to reduce the refrigerant temperature. The refrigerant after heat exchange flows into the third expansion valve 9 through the fully open first expansion valve 7. The refrigerant after throttling and pressure reduction by the third expansion valve 19 further reduces the refrigerant temperature, and then flows into the third heat exchanger 5 through the second end of the third expansion valve 9. Another part of the refrigerant discharged from the exhaust port of the compressor 1 flows into the D end of the first four-way valve, and then flows into the second heat exchanger 4 through the C end of the first four-way valve. That is, part of the refrigerant discharged from the exhaust port of the compressor 1 flows into the second heat exchanger 4, and the refrigerant flowing into the second heat exchanger 4 is high-temperature refrigerant. The high-temperature refrigerant exchanges heat with the domestic water in the water tank 3. At this time, the second heat exchanger 4 uses the heat of part of the refrigerant to heat the domestic water in the water tank 3. The refrigerant after heat exchange flows into the second expansion valve 10 through the fourth end of the second heat exchanger 4 to adjust the flow rate of the refrigerant flowing out of the second heat exchanger 4 to reduce the refrigerant temperature, and then the refrigerant after throttling and pressure reduction flows into the third expansion valve 9 again. The refrigerant after throttling and pressure reduction by the third expansion valve 9 further reduces the refrigerant temperature, and then flows into the third heat exchanger 5 through the second end of the third expansion valve 9. The refrigerant flowing in the third heat exchanger 5 exchanges heat with the indoor air to absorb indoor heat to reduce the indoor temperature, that is, the third heat exchanger 5 absorbs heat. At this time, the air conditioner 100 operates in the refrigeration mode, and then the refrigerant after heat exchange flows into the E end of the second four-way valve 11 through the first end of the third heat exchanger 5, and then flows back to the compressor 1 through the S end of the second four-way valve 11 and the intake port of the compressor 1. Thus, the air conditioner 100 realizes partial recovery of waste heat under the condition of refrigeration.

[0103] In some embodiments, the conduction states of the first four-way valve 10, the second four-way valve 11, and the three-way valve 12 are controlled according to the heat recovery state and the refrigeration state. The controller is specifically configured to control the communication between the S end and the D end of the first four-way valve 10, the communication between the D end and the C end of the second four-way valve 11, the communication between the E end and the S end of the second four-way valve 11, the communication between the first end and the second end of the three-way valve 12, the first expansion valve 7 to be conducting and in a fully open state, the second expansion valve 8 to be closed, and the third expansion valve 9 to be conducting under the condition that the heat recovery state is a stopped heat recovery state and the refrigeration state is refrigeration.

[0104] Specifically, if it is determined that the required heat recovery state of the air conditioner 100 is a stopped heat recovery state and the refrigeration state of the air conditioner 100 is refrigeration, control the communication between the S end and the D end of the first four-way valve 10, the communication between the D end and the C end of the second four-way valve 11, the communication between the E end and the S end of the second four-way valve 11, the communication between the first end and the second end of the three-way valve 12, the first expansion valve 7 to be conducting and in a fully open state, the second expansion valve 8 to be closed, and the third expansion valve 9 to be conducting. At this time, the refrigerant flow direction is as shown in Figure 14 That is to say, the refrigerant discharged from the exhaust port of the compressor 1 flows into the D end of the second four-way valve 11, flows into the second end of the three-way valve 12 through the C end of the second four-way valve 11, then flows into the first heat exchanger 3 through the first end of the three-way valve 12. The first heat exchanger 3 exchanges heat between the refrigerant and the outdoor air, that is, the refrigerant releases heat to the outdoor air to reduce the refrigerant temperature. The heat-exchanged refrigerant flows into the third expansion valve 9 through the fully open first expansion valve 7. The refrigerant after throttling and pressure reduction by the third expansion valve 9 further reduces the refrigerant temperature, and then flows into the third heat exchanger 5 through the second end of the third expansion valve 9. The refrigerant flowing in the third heat exchanger 5 exchanges heat with the indoor air to absorb the indoor heat to reduce the indoor temperature, that is, the third heat exchanger 5 absorbs heat. At this time, the air conditioner 100 operates in the refrigeration mode. Then the heat-exchanged refrigerant flows into the E end of the second four-way valve 11 through the first end of the third heat exchanger 5, and then flows back to the compressor 1 through the S end of the second four-way valve 11 and the intake port of the compressor 1. Thus, the air conditioner 100 realizes refrigeration without recovering waste heat.

[0105] In some embodiments, when controlling the second expansion valve 8 to be turned on, the controller is further configured to obtain the superheat degree of the exhaust gas of the compressor 1 and the refrigerant pressure in the pipeline; and control the opening degree of the second expansion valve 8 according to the superheat degree of the exhaust gas and / or the refrigerant pressure in the pipeline. That is, under the conditions that the heat recovery state is the full heat recovery state or the partial heat recovery state and the refrigeration state is non-refrigeration, or under the conditions that the heat recovery state is the partial heat recovery state and the refrigeration state is refrigeration, when controlling the second expansion valve to be turned on, the opening degree of the second expansion valve is controlled according to the superheat degree of the exhaust gas and / or the refrigerant pressure in the pipeline.

[0106] Specifically, when the refrigerant flow rate in the air conditioner 100 is too large, the residence time of the refrigerant in the compressor 1 is relatively short, and the refrigerant cannot fully exchange heat with the compressor 1, resulting in insufficient superheat degree of the exhaust gas of the compressor 1. When the refrigerant flow rate in the air conditioner 100 is too small, the residence time of the refrigerant in the compressor 1 is relatively long, and the refrigerant fully exchanges heat with the compressor 1, resulting in too high superheat degree of the exhaust gas of the compressor 1. Moreover, the saturation temperature of the refrigerant pressure in the pipeline is the temperature when the refrigerant is in a saturated state (i.e., part liquid and part vapor coexist) under a certain refrigerant pressure, and the saturation temperature of the refrigerant pressure in the pipeline can heat the domestic water in the water tank only when it is greater than the water temperature of the water tank. Therefore, the opening degree of the second expansion valve 8 is controlled according to the superheat degree of the exhaust gas and / or the refrigerant pressure in the pipeline. For example, the opening degree of the second expansion valve 8 is controlled according to the refrigerant pressure in the pipeline. If the water temperature of the water tank is T1, the opening degree of the second expansion valve 10 is used to control the saturation temperature of the refrigerant pressure in the pipeline to be between T1 + 1°C and T1 + 3°C. Among them, if the saturation temperature of the refrigerant pressure in the pipeline is lower than T1, the opening degree of the second expansion valve 8 is reduced to reduce the refrigerant flow rate, so that the refrigerant can fully exchange heat with the compressor 1, thereby increasing the saturation temperature of the refrigerant pressure in the pipeline of the compressor 1; if the saturation temperature of the refrigerant pressure in the pipeline is greater than T1 + 3°C, the opening degree of the second expansion valve 8 is increased to increase the refrigerant flow rate, so that the refrigerant cannot fully exchange heat with the compressor 1, thereby reducing the saturation temperature of the refrigerant pressure in the pipeline of the compressor 1. Or, the opening degree of the second expansion valve 8 is controlled according to the superheat degree of the exhaust gas. Among them, the superheat degree of the exhaust gas refers to the difference between the exhaust gas temperature and the saturation temperature corresponding to the exhaust gas pressure. The superheat degree of the exhaust gas should be within a preset superheat degree range. Among them, the preset superheat degree range can be 15°C - 20°C. If the superheat degree of the exhaust gas is lower than the lower limit value of the preset superheat degree range, it indicates that the refrigerant flow rate is too large at this time, and the opening degree of the second expansion valve 8 is reduced to reduce the refrigerant flow rate, so that the refrigerant can fully exchange heat with the compressor 1, thereby increasing the superheat degree of the exhaust gas of the compressor 1 and avoiding the problem of too low superheat degree of the exhaust gas of the compressor 1. If the superheat degree of the exhaust gas is higher than the upper limit value of the preset superheat degree range, it indicates that the refrigerant flow rate is too small at this time, and the opening degree of the second expansion valve 8 is increased to increase the refrigerant flow rate. At this time, the refrigerant cannot fully exchange heat with the compressor 1, thereby reducing the superheat degree of the exhaust gas of the compressor 1 and avoiding the problem of too high superheat degree of the exhaust gas of the compressor 1.

[0107] Exemplarily, for controlling the opening degree of the second expansion valve 10 according to the exhaust superheat degree and / or the refrigerant pressure in the pipeline, the specific process of the controller includes the following steps.

[0108] Step S13, obtain the exhaust superheat degree of the compressor and the refrigerant pressure in the pipeline.

[0109] Step S14, control the opening degree of the second expansion valve according to the exhaust superheat degree and / or the refrigerant pressure in the pipeline.

[0110] In some embodiments, when controlling the third expansion valve 9 to be conducted, the controller is further configured to obtain the exhaust superheat degree of the compressor and the refrigerant pressure in the pipeline; control the opening degree of the third expansion valve 9 according to the exhaust superheat degree and the refrigerant pressure in the pipeline. That is to say, under the condition that the heat recovery state is the full heat recovery state and the refrigeration state is refrigeration, or under the condition that the heat recovery state is the partial heat recovery state and the refrigeration state is refrigeration, under the condition that the heat recovery state is the stop heat recovery state and the refrigeration state is refrigeration, when controlling the third expansion valve 9 to be conducted, control the opening degree of the third expansion valve 9 according to the exhaust superheat degree and the refrigerant pressure in the pipeline.

[0111] Specifically, when the refrigerant flow rate in the air conditioner 100 is too large, the residence time of the refrigerant in the compressor 1 is relatively short, and the refrigerant cannot fully exchange heat with the compressor 1, resulting in insufficient superheat of the compressor 1's exhaust gas. When the refrigerant flow rate in the air conditioner 100 is too small, the residence time of the refrigerant in the compressor 1 is relatively long, and the refrigerant fully exchanges heat with the compressor 1, resulting in too high superheat of the compressor 1's exhaust gas. In addition, the saturation temperature of the refrigerant pressure in the pipeline is the temperature when the refrigerant is in a saturated state (i.e., part liquid and part vapor coexist) under a certain refrigerant pressure. The saturation temperature of the refrigerant pressure in the pipeline can heat the domestic water in the water tank only when it is higher than the water temperature of the water tank. Therefore, the opening degree of the third expansion valve 9 is controlled according to the superheat of the exhaust gas and / or the refrigerant pressure in the pipeline. For example, the opening degree of the third expansion valve 9 is controlled according to the refrigerant pressure in the pipeline. If the water temperature of the water tank is T1, the opening degree of the third expansion valve 9 is used to control the saturation temperature of the refrigerant pressure in the pipeline between T1 + 1°C and T1 + 3°C. Among them, if the saturation temperature of the refrigerant pressure in the pipeline is lower than T1, the opening degree of the third expansion valve 9 is reduced to reduce the refrigerant flow rate, so that the refrigerant fully exchanges heat with the compressor 1, thereby increasing the saturation temperature of the refrigerant pressure in the pipeline of the compressor 1; if the saturation temperature of the refrigerant pressure in the pipeline is greater than T1 + 3°C, the opening degree of the third expansion valve 9 is increased to increase the refrigerant flow rate, so that the refrigerant cannot fully exchange heat with the compressor 1, thereby reducing the saturation temperature of the refrigerant pressure in the pipeline of the compressor 1. Or, the opening degree of the third expansion valve 9 is controlled according to the superheat of the exhaust gas. Among them, the superheat of the exhaust gas refers to the difference between the exhaust gas temperature and the saturation temperature corresponding to the exhaust gas pressure. The superheat of the exhaust gas should be within a preset superheat range. Among them, the preset superheat range can be 15°C - 20°C. If the superheat of the exhaust gas is lower than the lower limit value of the preset superheat range, it means that the refrigerant flow rate is too large at this time, and the opening degree of the third expansion valve 9 is reduced to reduce the refrigerant flow rate, so that the refrigerant fully exchanges heat with the compressor 1, thereby increasing the superheat of the compressor 1's exhaust gas and avoiding the problem of too low superheat of the compressor 1's exhaust gas. If the superheat of the exhaust gas is higher than the upper limit value of the preset superheat range, it means that the refrigerant flow rate is too small at this time, and the opening degree of the third expansion valve 9 is increased to increase the refrigerant flow rate. At this time, the refrigerant cannot fully exchange heat with the compressor 1, thereby reducing the superheat of the compressor 1's exhaust gas and avoiding the problem of too high superheat of the compressor 1's exhaust gas.

[0112] Among them, for controlling the opening degree of the third expansion valve 12 according to the superheat of the exhaust gas and / or the refrigerant pressure in the pipeline, the specific process of the controller includes the following steps.

[0113] Step S15, obtain the superheat of the compressor's exhaust gas and the refrigerant pressure in the pipeline Step S16, control the opening degree of the third expansion valve according to the superheat of the exhaust gas and the refrigerant pressure in the pipeline.

[0114] In some embodiments, the controller is further configured to control the air conditioner 100 to stop operating when the water tank temperature is greater than the second preset temperature threshold and the heat exchange temperature is less than the third preset temperature threshold.

[0115] Specifically, when the water tank temperature is greater than the second preset temperature threshold, the temperature of the domestic water in the water tank 2 has reached the user's requirement. If heat recovery continues to heat the domestic water in the water tank, it will cause energy waste and may also pose a safety hazard due to the too high water tank temperature. And when the heat exchange temperature of the third heat exchanger 5 is less than the third preset temperature threshold, at this time the indoor temperature is very low, then the air conditioner 100 does not need to continue refrigerating, so the air conditioner 100 is controlled to stop operating. Thus, the air conditioner 100 is controlled to stop operating when the domestic water temperature is relatively high and the indoor temperature is relatively low, thereby avoiding energy waste.

[0116] The following refers to Figure 15 to illustrate the control process of the air conditioner 100 according to the embodiments of the present invention by way of example. The specific steps are as follows.

[0117] Step S17, start.

[0118] Step S18, the user inputs the operating mode of the air conditioner, where the operating mode is the refrigeration mode.

[0119] Among them, the user can input the operating mode of the air conditioner through the remote control, the air conditioner application program in the mobile terminal or the operation panel on the body of the air conditioner, and input the operating mode of the air conditioner through operation methods such as language and gestures.

[0120] Step S19, the air conditioner enters the refrigeration mode.

[0121] Step S20, the refrigeration circulating water pump operates for 2 minutes.

[0122] Step S21, the controller determines whether the heat exchange temperature is less than the third preset temperature threshold. If so, execute step S39. If not, execute step S22.

[0123] Step S22, the controller determines whether the water tank temperature is less than the first preset temperature threshold. If so, execute step S23. If not, execute step S48.

[0124] Step S23, if the required heat recovery state of the air conditioner is the total heat recovery state and the refrigeration state is refrigeration, the third heat exchanger serves as an evaporator, and the refrigerant flowing in the third heat exchanger exchanges heat with the indoor air to absorb the indoor heat to reduce the indoor temperature, thereby realizing the refrigeration of the air conditioner.

[0125] Step S24, control the third end of the three-way valve to communicate with the S end of the second four-way valve.

[0126] Step S25: Control the D port of the first four-way valve to communicate with the C port of the first four-way valve, control the D port of the second four-way valve to communicate with the C port of the second four-way valve, and control the E port of the second four-way valve to communicate with the S port of the second four-way valve.

[0127] Step S26: Control the second expansion valve to be fully open.

[0128] Step S27: Control the first expansion valve to close.

[0129] Step S28: Control the opening degree of the third expansion valve according to the exhaust superheat degree and / or the refrigerant pressure in the pipeline.

[0130] Step S29: The user sets the second preset temperature threshold, where the second preset temperature threshold can be 55°C.

[0131] Step S30: Judge whether the water tank temperature is greater than the second preset temperature threshold. If so, execute Step S32; if not, execute Step S31.

[0132] Step S31: Judge whether the water tank temperature is greater than or equal to the first preset temperature threshold and less than or equal to the second preset temperature threshold. If so, execute Step S48; if not, execute Step S21.

[0133] Step S32: If the required heat recovery state of the air conditioner is the stop heat recovery state and the refrigeration state is refrigeration.

[0134] Step S33: Judge whether the heat exchange temperature is less than the third preset temperature threshold. If so, execute Step S55; if not, execute Step S34.

[0135] Step S34: Control the second expansion valve to close.

[0136] Step S35: Control the first expansion valve to be fully open.

[0137] Step S36: Control the opening degree of the second expansion valve according to the exhaust superheat degree and / or the refrigerant pressure in the pipeline.

[0138] Step S37: Control the second port of the three-way valve to communicate with the C port of the second four-way valve.

[0139] Step S38: Control the operating state of the fan according to the refrigerant pressure in the pipeline, and execute Step S21.

[0140] Step S39: Judge whether the water tank temperature is less than the first preset temperature threshold. If so, execute Step S40; if not, execute Step S22.

[0141] Step S40, if the heat recovery state required by the air conditioner is the total heat recovery state and the cooling state is cooling, the first heat exchanger serves as an evaporator, and the first heat exchanger exchanges heat between the refrigerant and the outdoor air, that is, the refrigerant releases heat to the outdoor air to further reduce the temperature of the refrigerant.

[0142] Step S41, control the third end of the three-way valve to communicate with the S end of the second four-way valve.

[0143] Step S42, control the D end of the first four-way valve to communicate with the C end of the first four-way valve, control the D end of the second four-way valve to communicate with the C end of the second four-way valve, and control the E end of the second four-way valve to communicate with the S end of the second four-way valve.

[0144] Step S43, control the opening degree of the second expansion valve according to the exhaust superheat degree and / or the pipeline refrigerant pressure.

[0145] Step S44, control the second expansion valve to be fully open.

[0146] Step S45, control the third expansion valve to close.

[0147] Step S46, the user sets the second preset temperature threshold.

[0148] Step S47, determine whether the water tank temperature is greater than the second preset temperature threshold. If so, execute step S33; if not, execute step S30.

[0149] Step S48, if the heat recovery state required by the air conditioner is the partial heat recovery state and the cooling state is cooling.

[0150] Step S49, the second end of the three-way valve communicates with the C end of the second four-way valve.

[0151] Step S50, control the D end of the first four-way valve to communicate with the C end of the first four-way valve, control the D end of the second four-way valve to communicate with the C end of the second four-way valve, and control the E end of the second four-way valve to communicate with the S end of the second four-way valve.

[0152] Step S51, control the opening degree of the second expansion valve according to the exhaust superheat degree and / or the pipeline refrigerant pressure.

[0153] Step S52, control the first expansion valve to be fully open.

[0154] Step S53, control the opening degree of the third expansion valve according to the exhaust superheat degree and / or the pipeline refrigerant pressure.

[0155] Step S54, the user sets the second preset temperature and execute step S30.

[0156] Step S55, control the air conditioner to stop running.

[0157] In some embodiments, the present application can also adopt a parallel and series connection method of seven solenoid valves to change the flow direction of the refrigerant discharged at the exhaust port. Specifically, referring to Figure 16 as shown, the first end of the first pipeline is connected to the exhaust port through the first solenoid valve, the first end of the second pipeline is connected to the exhaust port through the second solenoid valve, the ends of the first pipeline and the second pipeline are both used to connect to the first end of the third pipeline, and the end of the third pipeline is connected to the exhaust port through the third solenoid valve. The first heat exchanger 3 is located on the first pipeline, the second heat exchanger 4 is located on the second pipeline, and the third heat exchanger 5 is located on the third pipeline; the first expansion valve 7 is arranged on the first pipeline, the second expansion valve 8 is arranged on the second pipeline, and the third expansion valve 9 is arranged on the third pipeline; the first end of the fourth solenoid valve is connected to the third solenoid valve and the end of the third pipeline, the second end of the fourth solenoid valve is connected to the first end of the fifth solenoid valve 17, the first end of the seventh solenoid valve 19, and the intake port, and the first end of the sixth solenoid valve 18 is connected to the first solenoid valve. The second end of the sixth solenoid valve 18 is connected to the first end of the first pipeline and the second end of the seventh solenoid valve 19; a controller, which is configured to control the conduction of each solenoid valve and each expansion valve according to the operating mode of the air conditioner 100. The first solenoid valve, the second solenoid valve, the third solenoid valve, the fourth solenoid valve, the fifth solenoid valve 17, the sixth solenoid valve 18, and the seventh solenoid valve 19 distribute the refrigerant flowing to the first heat exchanger 3, the second heat exchanger 4, and the third heat exchanger 5.

[0158] Specifically, to solve this problem, in this application, based on the method of parallel and series connection of three expansion valves and seven solenoid valves, when the air conditioner 100 operates in the full heat recovery mode or the partial heat recovery mode, by controlling the conduction of each expansion valve and each solenoid valve, the flow rate and direction of the refrigerant are changed. Thus, both the full recovery of the waste heat of the air conditioner and the partial recovery of the waste heat of the air conditioner can be achieved. That is to say, according to the operating mode of the air conditioner 100, the conduction of each solenoid valve and each expansion valve is controlled. Namely, according to the full heat recovery mode or the partial heat recovery mode, the conduction or closing of the first expansion valve 7, the second expansion valve 8, the third expansion valve 9, the first solenoid valve, the second solenoid valve, the third solenoid valve, the fourth solenoid valve, the fifth solenoid valve 17, the sixth solenoid valve 18, and the seventh solenoid valve 19 is controlled to change the flow rate and direction of the refrigerant, so that the second heat exchanger uses part or all of the refrigerant to heat the domestic water in the water tank 2, realizing the full recovery or partial recovery of the waste heat. Thus, compared with the existing air conditioner using the scheme of two four-way valves in series and two check valves, or using the scheme of one four-way valve and four check valves to achieve the full recovery of the waste heat, in this application, the scheme of parallel and series connection of three expansion valves and seven solenoid valves is adopted to more accurately distribute the flow rate of the refrigerant in the air conditioner 100, so that the air conditioner 100 can not only achieve the full recovery of the waste heat, but also achieve the partial recovery of the waste heat, improve the comprehensive energy utilization rate of the air conditioning system, reduce the power consumption of the air conditioner 100, and thus achieve the purpose of saving electricity bills.

[0159] Exemplarily, if it is determined that the operating mode of the air conditioner 100 is the full heat recovery mode, then by controlling the opening or closing of the first expansion valve 7, the second expansion valve 8, the third expansion valve 9, the first solenoid valve, the second solenoid valve, the third solenoid valve, the fourth solenoid valve, the fifth solenoid valve 17, the sixth solenoid valve 18 and the seventh solenoid valve 19, all the high-temperature gaseous refrigerant discharged from the compressor 1 flows into the second heat exchanger 4. The high-temperature gaseous refrigerant exchanges heat with the domestic water in the water tank 2 on the other side of the second heat exchanger 4. At this time, the second heat exchanger 4 uses all the refrigerant to generate heat for heating the domestic water in the water tank 2. Then, the refrigerant that has exchanged heat with the second heat exchanger 4 flows back to the compressor 1 after heat exchange through the third heat exchanger 5. Or, if it is determined that the operating mode of the air conditioner 100 is the partial heat recovery mode, then by controlling the opening or closing of the first expansion valve 7, the second expansion valve 8, the third expansion valve 9, the first solenoid valve, the second solenoid valve, the third solenoid valve, the fourth solenoid valve, the fifth solenoid valve 17, the sixth solenoid valve 18 and the seventh solenoid valve 19, part of the high-temperature gaseous refrigerant discharged from the compressor 1 flows into the second heat exchanger. Part of the high-temperature gaseous refrigerant exchanges heat with the domestic water in the water tank 2 on the other side of the second heat exchanger 4. At this time, the second heat exchanger 4 uses part of the refrigerant to generate heat for heating the domestic water in the water tank 2. At the same time, the other part of the high-temperature gaseous refrigerant discharged from the compressor 1 flows into the first heat exchanger 3 for heat exchange. Then, the refrigerant that has exchanged heat with the second heat exchanger 4 and the first exchanger flows back to the compressor 1 through the third heat exchanger 5. Thus, full heat recovery and partial heat recovery are achieved, the comprehensive energy utilization rate of the air conditioning system is improved, the power consumption of the air conditioner 100 is reduced, and the purpose of saving electricity bills is achieved.

[0160] For the air conditioner according to the embodiment of the present invention, three heat exchangers are respectively arranged on different pipelines, and seven solenoid valves are arranged between each pipeline and the exhaust port of the compressor to adjust the refrigerant flow direction. Thus, when the compressor discharges the refrigerant, it is no longer only that the refrigerant first passes through the water tank preferentially, but based on the operating mode of the air conditioner, the opening conditions of each solenoid valve and each expansion valve are controlled, so as to selectively control the refrigerant discharged from the exhaust port to enter the first pipeline, the second pipeline and / or the third pipeline. Thus, while the air conditioner has multiple different operating modes, the problem of insufficient or excessive cooling or heating capacity caused by the refrigerant heating the water tank first is avoided.

[0161] In addition, based on the parallel and series connection of three expansion valves and seven solenoid valves, when the air conditioner 100 operates in the full heat recovery mode or the partial heat recovery mode, the flow rate and direction of the refrigerant are changed by controlling the conduction of each expansion valve and each solenoid valve, so as to achieve the full recovery or partial recovery of waste heat. Therefore, compared with the existing air conditioner that uses the scheme of two four-way valves connected in series and two one-way valves, or the scheme of one four-way valve and four one-way valves to achieve the full recovery of waste heat, the scheme of three expansion valves and seven solenoid valves connected in parallel and series is adopted in this application to more accurately distribute the flow rate of the refrigerant in the air conditioner 100, so that the air conditioner 100 can not only achieve the full recovery of waste heat, but also achieve the partial recovery of waste heat, improve the comprehensive energy utilization rate of the air conditioning system, reduce the power consumption of the air conditioner 100, and thus achieve the purpose of saving electricity bills.

[0162] In some embodiments, for controlling the conduction of each solenoid valve and each expansion valve according to the operating mode of the air conditioner 100, the controller is specifically configured to: when the operating mode is the full heat recovery mode of simultaneous refrigeration and hot water production, control the second solenoid valve and the fourth solenoid valve to be both opened, and control the first solenoid valve, the third solenoid valve, the fifth solenoid valve 17, the sixth solenoid valve 18, and the seventh solenoid valve 19 to be all closed, and control the first expansion valve 7 to be closed, the second expansion valve 8 to be conductive, and the third expansion valve 9 to be conductive.

[0163] Specifically, if the air conditioner 100 operates in the full heat recovery mode of simultaneous refrigeration and hot water production, control the second solenoid valve and the fourth solenoid valve to be both opened, and control the first solenoid valve, the third solenoid valve, the fifth solenoid valve 17, the sixth solenoid valve 18, and the seventh solenoid valve 19 to be all closed, and control the first expansion valve 7 to be closed, the second expansion valve 8 to be conductive, and the third expansion valve 9 to be conductive. At this time, the refrigerant flow direction is as Figure 17As shown, the second heat exchanger uses all the high-temperature gaseous refrigerant discharged by the compressor 1 to heat the water in the water tank 2. The refrigerant after heat exchange then exchanges heat with the indoor air through the third heat exchanger to lower the indoor temperature. Thus, the air conditioner 100 realizes the full heat recovery mode of simultaneous refrigeration and hot water production. That is to say, under the action of the second solenoid valve being opened and the first solenoid valve being closed, all the high-temperature gaseous refrigerant discharged by the compressor 1 flows into the second heat exchanger 4 through the second solenoid valve. The high-temperature gaseous refrigerant exchanges heat with the domestic water in the water tank 2 on the other side of the second heat exchanger 4. At this time, the second heat exchanger 4 uses all the refrigerant to generate heat for heating the domestic water in the water tank 2, that is, the air conditioner 100 operates in the full heat recovery mode of hot water production. The refrigerant after heat exchange flows through the second expansion valve 8 and the third expansion valve 9 and is throttled and depressurized to a low-temperature refrigerant, and then flows into the third heat exchanger 5. The low-temperature refrigerant flowing in the third heat exchanger 5 exchanges heat with the indoor air to absorb the indoor heat to lower the indoor temperature. Thus, the air conditioner 100 operates in the refrigeration mode. Then, when the third solenoid valve, the fifth solenoid valve 17, the sixth solenoid valve 18, and the seventh solenoid valve 19 are all closed, and under the opening action of the fourth solenoid valve, the refrigerant flows into the intake port of the compressor 1 through the fourth solenoid valve. Thus, the air conditioner 100 realizes the full recovery of waste heat during refrigeration.

[0164] In some embodiments, for controlling the conduction of each solenoid valve and each expansion valve according to the operating mode of the air conditioner 100, the controller is specifically configured to: when the operating mode is the partial heat recovery mode of simultaneous refrigeration and hot water production, control the first solenoid valve, the second solenoid valve, the fourth solenoid valve, and the sixth solenoid valve 18 to be all opened, and control the third solenoid valve, the fifth solenoid valve 17, and the seventh solenoid valve 19 to be all closed, and control the first expansion valve 7, the second expansion valve 8, and the third expansion valve 9 to be all conducted.

[0165] Specifically, when the air conditioner 100 operates in the partial heat recovery mode of simultaneous refrigeration and hot water production, the controller controls the first solenoid valve, the second solenoid valve, the fourth solenoid valve, and the sixth solenoid valve 18 to be all opened, and controls the third solenoid valve, the fifth solenoid valve 17, and the seventh solenoid valve 19 to be all closed, and controls the first expansion valve 7, the second expansion valve 8, and the third expansion valve 9 to be all conducted. At this time, the refrigerant flow direction is as Figure 18As shown, that is to say, under the action of the opening of both the first solenoid valve and the second solenoid valve, a part of the high-temperature gaseous refrigerant discharged by the compressor 1 flows into the second heat exchanger 4 through the second solenoid valve. A part of the high-temperature gaseous refrigerant exchanges heat with the domestic water in the water tank 2 on the other side of the second heat exchanger 4. At this time, the second heat exchanger 4 uses part of the refrigerant to generate heat for heating the domestic water in the water tank 2. That is, the air conditioner 100 operates in the hot water production partial heat recovery mode. The refrigerant after heat exchange with the second heat exchanger 4 is throttled and depressurized by the second expansion valve 8 in the second pipeline 7 into a low-temperature refrigerant. At the same time, another part of the high-temperature gaseous refrigerant discharged by the compressor 1 flows into the first heat exchanger 3 through the first solenoid valve and the sixth solenoid valve 18 under the action of the opening of the first solenoid valve and the sixth solenoid valve 18. The first heat exchanger is located outdoors. The first heat exchanger 3 exchanges heat between part of the refrigerant and outdoor air. That is, the refrigerant releases heat to the outdoor air to exchange heat for the circulating refrigerant. The refrigerant after heat exchange with the first heat exchanger 3 is throttled and depressurized by the first expansion valve 7 in the first pipeline 6 through the first expansion valve 7 in the first pipeline 6 into a low-temperature refrigerant. The low-temperature refrigerant converging at the ends of the first pipeline 6 and the second pipeline 7 is throttled and depressurized by the third expansion valve 9. The further cooled low-temperature refrigerant enters the third heat exchanger 5. The low-temperature refrigerant flowing in the third heat exchanger 5 exchanges heat with the indoor air to absorb indoor heat to lower the indoor temperature. Thus, the air conditioner 100 operates in the refrigeration mode. Then, under the action of the closing of the third solenoid valve and the seventh solenoid valve 19 and the opening of the fourth solenoid valve, the refrigerant after heat exchange flows into the intake port of the compressor 1 through the fourth solenoid valve. Thus, the air conditioner 100 realizes partial recovery of waste heat during refrigeration.

[0166] In some embodiments, the controller is further configured to: when the outdoor ambient temperature is within the normal operating range of the compressor 1, and the heat exchange temperature of the third heat exchanger is greater than the first preset temperature, and the shutdown duration of the compressor 1 reaches the preset duration, control the compressor 1 to start so that the air conditioner 100 operates in the refrigeration mode; when the outdoor ambient temperature is within the normal operating range of the compressor 1, and the domestic water temperature is lower than the second preset temperature, and the shutdown duration of the compressor 1 reaches the preset duration, control the compressor 1 to start so that the air conditioner 100 operates in the hot water production mode, where the hot water production mode includes the hot water production total heat recovery mode and the hot water production partial heat recovery mode; when the outdoor ambient temperature is within the normal operating range of the compressor 1, and the heat exchange temperature of the third heat exchanger is greater than the first preset temperature, and the domestic water temperature is lower than the second preset temperature, and the shutdown duration of the compressor 1 reaches the preset duration, control the compressor 1 to start so that the air conditioner 100 operates in the simultaneous refrigeration and hot water production mode.

[0167] Among them, the first preset temperature can be understood as the temperature value preset for determining whether the indoor environment requires the air conditioner 100 to operate in the cooling mode for adjustment. The first preset temperature can be 5°C. The preset duration can be understood as the duration threshold for determining that the compressor 1 has not started. The preset duration can be 3 minutes. The second preset temperature can be understood as the temperature value preset for determining whether domestic water needs to be heated. The second preset temperature can be 55°C. When the third heat exchanger is a plate heat exchanger, the heat exchange temperature is the outlet water temperature of the plate heat exchanger.

[0168] Specifically, since the operation of the compressor 1 at extremely low outdoor ambient temperatures may affect the lifespan of the compressor 1 and increase the risk of the compressor 1 malfunctioning, when the outdoor ambient temperature is within the normal operating range of the compressor 1, the compressor 1 can start and operate normally and maintain a high-efficiency working state at this time; when the indoor ambient temperature is high, it will cause a high heat exchange temperature between the indoor environment and the third heat exchanger; since the air conditioner 100 may start when the shutdown duration of the compressor 1 has not reached the preset duration, but the compressor 1 has stopped briefly due to special circumstances. Based on this, when the outdoor ambient temperature is within the normal operating range of the compressor 1, it indicates that the compressor 1 can start and operate normally and maintain a high-efficiency working state at this time, and when the heat exchange temperature of the third heat exchanger is greater than the first preset temperature, it indicates that the indoor ambient temperature is high. At this time, the air conditioner 100 needs to operate in the cooling mode, and when the shutdown duration of the compressor 1 reaches the preset duration, it indicates that the compressor 1 has not started and the air conditioner 100 is in an idle state. Then, the compressor 1 is controlled to start so that the air conditioner 100 operates in the cooling mode. Thus, in this application, it is determined whether the air conditioner 100 operates in the cooling mode through the heat exchange temperature of the third heat exchanger, and at the same time, it is determined that the outdoor ambient temperature and the shutdown duration of the compressor 1 meet the requirements to ensure that the compressor 1 can start normally, effectively improving the service life and working efficiency of the compressor 1.

[0169] When the outdoor ambient temperature is within the normal operating range of the compressor 1, it indicates that the compressor 1 can start and operate normally and maintain a high-efficiency working state at this time, and when the temperature of the domestic water is lower than the second preset temperature, it indicates that the temperature of the domestic water is low. At this time, the air conditioner 100 needs to operate in the hot water heating mode, and when the shutdown duration of the compressor 1 reaches the preset duration, it indicates that the compressor 1 has not started and the air conditioner 100 is in an idle state. The compressor 1 is controlled to start so that the air conditioner 100 operates in the hot water heating mode, where the hot water heating mode includes the full heat recovery mode and the partial heat recovery mode of hot water heating. Thus, in this application, it is determined whether the air conditioner 100 operates in the hot water heating mode through the temperature of the domestic water, and at the same time, it is determined that the outdoor ambient temperature and the shutdown duration of the compressor 1 meet the requirements to ensure that the compressor 1 can start normally, effectively improving the service life and working efficiency of the compressor 1.

[0170] When the outdoor ambient temperature is within the normal operating range of the compressor 1, it indicates that the compressor 1 can start and operate normally and maintain an efficient working state. And if the heat exchange temperature of the third heat exchanger is greater than the first preset temperature, it means that the indoor ambient temperature is relatively high. At this time, the air conditioner needs to operate in the cooling mode. And if the domestic water temperature is lower than the second preset temperature, it means that the domestic water temperature is relatively low. At this time, the air conditioner 100 needs to operate in the hot water heating mode. And when the shutdown duration of the compressor 1 reaches the preset duration, it indicates that the compressor 1 has not started and the air conditioner 100 is in an idle state. Then control the compressor 1 to start so that the air conditioner 100 operates in both the cooling and hot water heating modes simultaneously. Thus, in this application, the air conditioner 100 is determined to operate in both the cooling and hot water heating modes based on the heat exchange temperature of the third heat exchanger and the domestic water temperature, and at the same time, it is determined that the outdoor ambient temperature and the shutdown duration of the compressor 1 meet the requirements to ensure that the compressor 1 can start normally, effectively improving the service life and working efficiency of the compressor 1.

[0171] In addition, it should be noted that when the outdoor ambient temperature is not within the normal operating range of the compressor 1, the compressor 1 is not allowed to start.

[0172] In some embodiments, after controlling the compressor 1 to start, the controller is further configured to execute steps S1 to S2: Step S1, determine the first temperature difference between the domestic water temperature and the target water temperature, and determine the second temperature difference between the heat exchange temperature of the third heat exchanger and the target heat exchange temperature.

[0173] Step S2, control the change range of the operating frequency of the compressor 1 according to the first temperature difference and the second temperature difference.

[0174] In the embodiment, the compressor 1 starts at an initial frequency f, and the initial frequency f is generally between 25 and 40 Hz. After the compressor 1 starts, it operates at the initial frequency f for 3 minutes, and after 3 minutes, the change range of the operating frequency of the compressor 1 is controlled according to the first temperature difference and the second temperature difference.

[0175] Among them, the target water temperature is the domestic water temperature set by the user according to the demand. Specifically, if the first temperature difference between the domestic water temperature and the target water temperature is less than 0, it indicates that the domestic water temperature has not reached the domestic water temperature set by the user according to the demand. In this case, the compressor 1 needs to be controlled to operate at a higher frequency to increase the refrigerant flow rate into the second heat exchanger 4, so that the refrigerant can exchange heat with the domestic water more efficiently, thereby quickly increasing the domestic water temperature. Moreover, the lower the first temperature difference, the higher the change range of the operating frequency of the compressor 1. And if the second temperature difference between the heat exchange temperature of the third heat exchanger and the target heat exchange temperature is smaller, it indicates that the refrigeration demand is greater, and the change range of the operating frequency of the compressor 1 is higher. Based on this, when controlling the operating frequency of the compressor 1, in order to balance the refrigeration and domestic hot water demands, the present application controls the change range of the operating frequency of the compressor 1 through the first temperature difference and the second temperature difference. That is to say, the refrigeration demand and the domestic hot water demand are determined through the first temperature difference and the second temperature difference, and then the corresponding change range of the operating frequency of the compressor 1 that meets the refrigeration demand and the domestic hot water demand is selected, and then the operating frequency of the compressor 1 is adjusted according to this change range. Exemplarily, when both the first temperature difference and the second temperature difference are large, it indicates that the air conditioner 100 needs to quickly heat the domestic water and also needs to refrigerate efficiently, so the change range of the operating frequency of the compressor 1 is controlled to be high to simultaneously meet the refrigeration demand and the domestic hot water demand; when both the first temperature difference and the second temperature difference are small, the change range of the operating frequency of the compressor 1 is controlled to be low to simultaneously meet the refrigeration demand and the domestic hot water demand, avoiding energy waste caused by excessive adjustment. Thus, in the present application, the change range of the operating frequency of the compressor 1 is dynamically adjusted through the refrigeration demand and the domestic hot water demand, so as to balance the refrigeration and domestic hot water demands of the air conditioner, improve the overall efficiency of the system and the user experience.

[0176] In the embodiment, the corresponding relationship between the first temperature difference, the second temperature difference and the preset change range of the operating frequency of the compressor 1 can be preset in the controller. Thus, the corresponding preset change range can be obtained through the first temperature difference and the second temperature difference.

[0177] From Figure 19It can be seen that the change range of the operating frequency of the compressor 1 with ΔT1 ≤ -8 is higher than that of the compressor 1 with -1 < ΔT1 < 0, and the change range of the operating frequency of the compressor 1 with ΔT2 ≥ 8 is higher than that of the compressor 1 with -1 ≤ ΔT2 < -0.5. When ΔT1 ≥ 0, it indicates that the temperature of domestic water has reached the temperature of domestic water set by the user according to the demand, and there is no need to increase the operating frequency of the compressor 1 to heat the domestic water. At this time, only the change range of the operating frequency of the compressor 1 is controlled according to the second temperature difference; when ΔT2 < -2, there is no refrigeration demand, and there is no need to increase the operating frequency of the compressor 1 to increase the refrigeration capacity. At this time, only the change range of the operating frequency of the compressor 1 is controlled according to the first temperature difference. When the first temperature difference ΔT1 is the same, the greater the second temperature difference ΔT2, the greater the change range of the operating frequency of the compressor 1. When the second temperature difference ΔT2 is the same, the greater the first temperature difference ΔT1, the greater the change range of the operating frequency of the compressor 1.

[0178] Exemplarily, query through the first temperature difference ΔT1 and the second temperature difference ΔT2 Figure 19 to obtain the change range of the operating frequency of the compressor 1. If the first temperature difference ΔT1 ≤ -8 and the second temperature difference ΔT2 ≥ 8, the change range of the operating frequency of the compressor 1 is +8.

[0179] In some embodiments, when controlling the first expansion valve 7 in the hot water production part heat recovery mode, the controller is further configured to execute steps S3 to S5: Step S3, determine the third temperature difference between the coil temperature of the first heat exchanger and the outdoor ambient temperature.

[0180] Step S4, determine the first opening increment of the first expansion valve 7 according to the third temperature difference.

[0181] Step S5, adjust the opening of the first expansion valve 7 according to the first opening increment.

[0182] Specifically, the third temperature difference between the coil temperature of the first heat exchanger 3 and the outdoor ambient temperature is used to determine the superheat at the outlet of the first heat exchanger 3. When the third temperature difference is lower than the lower limit value of the temperature difference range corresponding to the superheat setting requirement, the superheat at the outlet of the first heat exchanger 3 is insufficient. That is to say, at this time, the refrigerant flow rate in the first heat exchanger 3 is too large and the residence time of the refrigerant in the first heat exchanger 3 is relatively short, and the refrigerant cannot fully exchange heat with the first heat exchanger 3. At this time, the opening degree of the first expansion valve 7 needs to be reduced to reduce the refrigerant flow rate, so that the refrigerant can fully exchange heat with the first heat exchanger 3 and increase the superheat at the outlet of the first heat exchanger 3 to make the superheat at the outlet of the first heat exchanger 3 meet the requirements. When the third temperature difference is higher than the upper limit value of the temperature difference range corresponding to the superheat setting requirement, the superheat at the outlet of the first heat exchanger 3 is too high. That is to say, at this time, the refrigerant flow rate in the first heat exchanger 3 is too small and the residence time of the refrigerant in the first heat exchanger 3 is relatively long, and the refrigerant fully exchanges heat with the first heat exchanger 3. At this time, the opening degree of the first expansion valve 7 needs to be increased to increase the refrigerant flow rate. Based on this, in order to ensure the efficient and stable operation of the first heat exchanger 3, when controlling the first expansion valve 7 in the hot water production part heat recovery mode in this application, the first opening degree increment of the first expansion valve 7 is determined according to the third temperature difference, so as to change the superheat at the outlet of the first heat exchanger 3 through the first opening degree increment to make the superheat at the outlet of the first heat exchanger 3 meet the set requirements. That is to say, when the third temperature difference is lower than the set requirement, the first opening degree increment is controlled to be negative, and the higher the third temperature difference, the greater the first opening degree increment, so as to increase the superheat at the outlet of the first heat exchanger 3 through the magnitude of the third temperature difference to make the superheat at the outlet of the first heat exchanger 3 meet the requirements. When the third temperature difference is higher than the set requirement, the first opening degree increment is controlled to be positive to reduce the superheat at the outlet of the first heat exchanger 3 to make the superheat at the outlet of the first heat exchanger 3 meet the requirements.

[0183] Exemplarily, when the domestic water temperature is greater than the second preset temperature, the opening degree of the first expansion valve 7 is controlled according to the third temperature difference between the coil temperature Tg of the first heat exchanger 3 and the outdoor ambient temperature Th, that is, the first opening degree increment of the first expansion valve 7 is determined according to the third temperature difference. The third temperature difference is expressed as Tg - Th. When 10°C ≤ Tg - Th < 15°C, the superheat of the first heat exchanger 3 meets the set requirements. If Tg - Th ≤ 5°C, the first opening degree increment ΔD is -5. If 5°C < Tg - Th < 10°C, the first opening degree increment ΔD1 is -2. If 10°C ≤ Tg - Th < 15°C, the first opening degree increment ΔD1 is 0. If Tg - Th ≥ 15°C, the first opening degree increment ΔD1 is +2. In addition, it should be noted that the opening degree of the first expansion valve 7 needs to be adjusted every 40 s.

[0184] In addition, it should be noted that when the domestic water temperature is lower than the second preset temperature, the opening degree of the first expansion valve 7 is maintained at 0 steps.

[0185] In some embodiments, when controlling the second expansion valve 8 in the hot water production mode, the controller is further configured to perform steps S6 to S8: Step S6: Obtain the condensation temperature of the refrigerant and determine the fourth temperature difference between the condensation temperature and the domestic water temperature.

[0186] Step S7: Determine the second opening increment of the second expansion valve 8 according to the domestic water temperature and the fourth temperature difference.

[0187] Step S8: Adjust the opening of the second expansion valve 8 according to the second opening increment.

[0188] Specifically, when the second heat exchanger 4 uses the refrigerant discharged from the compressor 1 to heat the domestic water in the water tank 2, if the opening degree of the second expansion valve 8 decreases and the increment of the opening degree of the second expansion valve 8 is smaller, the refrigerant flow rate discharged from the second heat exchanger 4 decreases at this time, so that the refrigerant can fully exchange heat with the domestic water to enhance the temperature rise effect of the domestic water. If the opening degree of the second expansion valve 8 decreases and the increment of the opening degree of the second expansion valve 8 is larger, the refrigerant flow rate discharged from the second heat exchanger 4 increases at this time to slow down the temperature rise effect of the domestic water; and the superheat degree of the second heat exchanger 4 is judged by the fourth temperature difference between the condensation temperature and the domestic water temperature. When the fourth temperature difference is lower than the lower limit value of the temperature difference range corresponding to the superheat degree setting requirement, the superheat degree at the outlet of the second heat exchanger 4 is insufficient. That is to say, at this time, the refrigerant flow rate in the second heat exchanger 4 is too large and the residence time of the refrigerant in the second heat exchanger 4 is relatively short, and the refrigerant cannot fully exchange heat with the second heat exchanger 4. At this time, it is necessary to reduce the opening degree of the second expansion valve 8 to reduce the refrigerant flow rate, so that the refrigerant can fully exchange heat with the second heat exchanger 4 and increase the superheat degree at the outlet of the second heat exchanger 4 to make the superheat degree at the outlet of the second heat exchanger 4 meet the requirements. When the fourth temperature difference is higher than the upper limit value of the temperature difference range corresponding to the superheat degree setting requirement, the superheat degree at the outlet of the second heat exchanger 4 is too high. That is to say, at this time, the refrigerant flow rate in the second heat exchanger 4 is too small and the residence time of the refrigerant in the second heat exchanger 4 is relatively long, and the refrigerant fully exchanges heat with the second heat exchanger 4. At this time, it is necessary to increase the opening degree of the second expansion valve 8 to increase the refrigerant flow rate. Based on this, in order to achieve precise control of the superheat degree of the second heat exchanger 4 and achieve the purpose of heating domestic water, the second opening degree increment of the second expansion valve 8 is determined according to the domestic water temperature and the fourth temperature difference, so as to change the superheat degree at the outlet of the second heat exchanger 4 through the second opening degree increment, so that the superheat degree at the outlet of the second heat exchanger 4 meets the set requirements. At the same time, the temperature rise effect of the domestic water is changed through the second opening degree increment, so that the domestic water temperature reaches the user-set temperature. That is to say, when the fourth temperature difference is lower than the set requirement, the second opening degree increment is controlled to be negative, and the higher the fourth temperature difference, the larger the second opening degree increment, so as to increase the superheat degree at the outlet of the second heat exchanger 4 through the size of the fourth temperature difference to make the superheat degree at the outlet of the second heat exchanger 4 meet the requirements. When the fourth temperature difference is higher than the set requirement, the second opening degree increment is controlled to be positive to reduce the superheat degree at the outlet of the second heat exchanger 4 to make the superheat degree at the outlet of the second heat exchanger 4 meet the requirements. At the same time, if it is determined that the domestic water temperature is lower, the second opening degree increment is negative, and the smaller the second opening degree increment, the better the temperature rise effect of the domestic water. Therefore, in this application, the second opening degree increment of the second expansion valve 8 is determined according to the domestic water temperature and the fourth temperature difference, so as to achieve precise control of the superheat degree of the second heat exchanger 4 and achieve the purpose of heating domestic water.

[0189] In an embodiment, a correspondence relationship between the domestic water temperature, the fourth temperature difference, and the second opening increment of the second expansion valve 8 can be preset in the controller. Thus, the corresponding second opening increment can be obtained based on the domestic water temperature and the fourth temperature difference.

[0190] It can be Figure 20 seen that the second opening increment ΔD2 with Tn - Tx ≤ 0 is lower than the second opening increment ΔD2 with 0 < Tn - Tx > 5. When Tn - Tx satisfies 10°C ≤ Tn - Tx < 15°C, the superheat of the second heat exchanger 4 meets the set requirements. When Tn - Tx is the same, the second opening increment ΔD2 with Tx < 45°C is lower than the second opening increment ΔD2 with 53 ≤ Tx, that is, when Tn - Tx is the same, the larger Tx is, the larger the second opening increment ΔD2 is.

[0191] Exemplarily, the fourth temperature difference can be expressed as the condensation temperature Tn - the domestic water temperature Tx. Query the Figure 20 table to obtain the second opening increment ΔD2 based on the domestic water temperature Tx and Tn - Tx. For example, if Tn - Tx ≤ 0 and 45 ≤ Tx < 50°C, the second opening increment ΔD2 is -4.

[0192] In some embodiments, when controlling the third expansion valve 9 in the simultaneous refrigeration and domestic hot water mode, the controller is further configured to: obtain the liquid pipe temperature of the third heat exchanger, the exhaust temperature of the compressor 1, and the inlet water temperature of the third heat exchanger; determine the fifth temperature difference between the inlet water temperature and the liquid pipe temperature; determine the third opening increment of the third expansion valve 9 based on the exhaust temperature and the fifth temperature difference; and adjust the opening of the third expansion valve 9 according to the third opening increment. Among them, it is the refrigerant temperature in the refrigerant-side connecting pipeline of the plate heat exchanger.

[0193] Specifically, the exhaust temperature of the compressor 1 indicates the high or low pressure of the low-pressure side of the refrigeration system. When the low-pressure is too high or too low, the refrigeration system becomes more unstable. At this time, the opening degree of the third expansion valve 9 needs to be changed to adjust the low-pressure by changing the refrigerant flow rate. In addition, the superheat degree of the third heat exchanger is judged by the fifth temperature difference between the inlet water temperature and the liquid pipe temperature. When the fifth temperature difference is lower than the lower limit value of the temperature difference range corresponding to the set requirement of the superheat degree, the superheat degree at the outlet of the third heat exchanger is insufficient. That is to say, at this time, the refrigerant flow rate in the third heat exchanger is too large and the residence time of the refrigerant in the third heat exchanger is relatively short, and the refrigerant cannot fully exchange heat with the third heat exchanger. At this time, the opening degree of the third expansion valve 9 needs to be reduced to reduce the refrigerant flow rate, so that the refrigerant can fully exchange heat with the third heat exchanger, and the superheat degree at the outlet of the third heat exchanger is increased to meet the requirements. Based on this, in order to accurately control the superheat degree of the third heat exchanger and balance the low-pressure of the refrigeration system at the same time, in this application, the third opening degree increment of the third expansion valve 9 is determined according to the exhaust temperature and the fifth temperature difference, so as to change the superheat degree at the outlet of the third heat exchanger through the third opening degree increment, so that the superheat degree at the outlet of the third heat exchanger meets the set requirements. That is to say, when the fifth temperature difference is lower than the set requirement, the second opening degree increment is controlled to be negative, and the higher the fifth temperature difference, the greater the third opening degree increment, so as to increase the superheat degree at the outlet of the third heat exchanger through the magnitude of the fifth temperature difference, so that the superheat degree at the outlet of the third heat exchanger meets the requirements. When the fifth temperature difference is lower than the lower limit value of the temperature difference range corresponding to the set requirement of the superheat degree, the third opening degree increment is controlled to be negative, and the higher the fifth temperature difference, the greater the third opening degree increment, so as to increase the superheat degree at the outlet of the third heat exchanger through the magnitude of the fifth temperature difference, so that the superheat degree at the outlet of the third heat exchanger meets the requirements. At the same time, the low-pressure of the refrigeration system is changed through the third opening degree increment to balance the low-pressure of the refrigeration system.

[0194] In the embodiment, the corresponding relationship between the exhaust temperature, the fifth temperature difference and the third opening degree increment of the third expansion valve 9 can be preset in the controller. Thus, the corresponding third opening degree increment can be obtained through the exhaust temperature and the fifth temperature difference.

[0195] Exemplarily, from Figure 21 the table in, when Tj - Ty satisfies Tj - Ty ≥ 2, the superheat degree of the third heat exchanger meets the set requirements. The third opening degree increment for 0 < Tj - Ty < 2 is greater than that for Tj - Ty ≤ 0, that is, the greater Tj - Ty, the higher the third opening degree increment. When Tj - Ty is the same, the third opening degree increment for Tp < 90°C is less than that for 90 ≤ Tp < 95°C and less than that for 95 ≤ Tp, that is, when Tj - Ty is the same, the greater Tp, the higher the third opening degree increment.

[0196] For example, the fifth temperature difference can be expressed as Tj-Ty, which can be obtained by looking up the exhaust temperature Tp and Tj-Ty. Figure 20 The third opening increment ΔD3 is obtained from the table. For example, if Tj-Ty≥2, Tp<90°C, the third opening increment ΔD3 is 0.

[0197] In the embodiment, when the first expansion valve 7, the second expansion valve 8 and the third expansion valve 9 affect each other and fluctuate, Figure 22 Controlled by the rules of the table.

[0198] In the embodiment, after the air-conditioning unit is powered on, the first expansion valve, the second expansion valve and the third expansion valve perform a reset action, first opening for 480 steps, then closing for 540 steps, and then opening to the initial number of steps. The three expansion valves act simultaneously, and the expansion valves can be electronic expansion valves.

[0199] The initial steps of the expansion valve are shown in the following table:

[0200] In some embodiments, the air conditioner 100 also includes an outdoor fan, and the controller is further configured to: in the full heat recovery mode for hot water production, control the outdoor fan to be turned off; in the partial heat recovery mode for hot water production, determine the sixth temperature difference between the condensation temperature of the refrigerant and the coil temperature of the first heat exchanger 3, and control the speed of the outdoor fan according to the sixth temperature difference.

[0201] Specifically, in order to accurately control the speed of the outdoor fan, the speed of the outdoor fan is controlled by the sixth temperature difference between the condensation temperature of the refrigerant and the coil temperature of the first heat exchanger 3 in the present application, that is, the indoor ventilation requirement is determined by the sixth temperature difference, and the speed of the outdoor fan is adjusted according to the indoor ventilation requirement, thereby accurately controlling the speed of the outdoor fan, effectively solving the indoor ventilation problem and improving the indoor air quality.

[0202] In some embodiments, for controlling the speed of the outdoor fan according to the sixth temperature difference, the controller is specifically configured as follows: if the sixth temperature difference is higher than the first temperature difference threshold, the speed of the outdoor fan is controlled to decrease; if the sixth temperature difference is lower than the second temperature difference threshold, the speed of the outdoor fan is controlled to increase, and the first temperature difference threshold is greater than the second temperature difference threshold.

[0203] Specifically, if the sixth temperature difference is higher than the first temperature difference threshold, it means that less fresh air is needed indoors, and the speed of the outdoor fan is controlled to decrease; if the sixth temperature difference is lower than the second temperature difference threshold, it means that more fresh air is needed indoors, and the speed of the outdoor fan is controlled to increase. Therefore, in the present application, the speed of the outdoor fan is controlled by the sixth temperature difference between the condensing temperature of the refrigerant and the coil temperature of the first heat exchanger 3, so as to accurately control the speed of the outdoor fan, effectively solve the problem of indoor ventilation, and improve the indoor air quality.

[0204] Exemplarily, in the hot water production part heat recovery mode, control the sixth temperature difference Tn - Tg to satisfy 3°C ≤ Tn - Tg ≤ 5°C. If Tn - Tg > 5°C, then control the speed of the outdoor fan to decrease; if Tn - Tg < 3°C, then control the speed of the outdoor fan to increase.

[0205] In the embodiment, as Figure 16 shown, the air conditioner 100 includes a first water pump 20 and a second water pump 21, which provide power for the water flow between the second heat exchanger and the water tank to heat and produce domestic hot water. The second water pump 21 delivers cold water and hot water to the user to lower or raise the temperature of the user's room.

[0206] In the embodiment, in the hot water production mode, control the coil temperature Tg of the first heat exchanger 3 to satisfy 5 ≤ Tg ≤ 12°C. If Tg > 12°C, then control the speed of the outdoor fan to decrease; if Tg < 5°C, then control the speed of the outdoor fan to increase. Alternatively, in the refrigeration mode, control the coil temperature of the first heat exchanger 3 to satisfy 35 ≤ Tg ≤ 45°C. If Tg < 35°C, then control the speed of the outdoor fan to decrease; if Tg > 45°C, then control the speed of the outdoor fan to increase.

[0207] In the embodiment, the control process of the first water pump is as follows: After the whole machine of the air conditioner 100 is powered on, the first water pump starts at the maximum speed, and the water flow switch state is detected. If the water flow switch is continuously detected to be off for 15S, it means that the water flow is too low, and the first water pump stops running. And when the temperature of domestic water Tx - the second preset temperature ≥ 0°C, the first water pump is delayed to close for 1 minute. When controlling the speed of the first water pump, the first water pump operates to maintain the outlet water temperature and the inlet water temperature of the second heat exchanger 4 to satisfy 4°C ≤ outlet water temperature - inlet water temperature ≤ 6°C. If the outlet water temperature - inlet water temperature < 4°C, the speed of the first water pump decreases, and the duty cycle decreases by 10% per minute, and it is adjusted once a minute. If the outlet water temperature - inlet water temperature > 6°C, the speed of the first water pump increases, and the duty cycle increases by 10% per minute, and it is adjusted once a minute.

[0208] In the embodiment, the control process of the second water pump is as follows: After the whole machine of the air conditioner 100 is powered on, the second water pump starts at the maximum speed, and the water flow switch state is detected. If the water flow switch is continuously detected to be off for 15S, it means that the water flow is too low, and the second water pump stops running. When the heat exchange temperature of the third heat exchanger - the first preset temperature > 5°C, the second water pump restarts.

[0209] Shutdown: When the heat exchange temperature of the third heat exchanger - the first preset temperature ≤ -2°C, the second water pump operates with the action of turning on for 2 minutes and turning off for 2 minutes. After the air conditioner 100 is shut down as a whole, the second water pump is turned off with a 2-minute delay. When controlling the rotational speed of the second water pump, the second water pump operates to maintain the outlet water temperature and the inlet water temperature of the second heat exchanger 4 such that 4°C ≤ inlet water temperature - outlet water temperature ≤ 6°C. If the inlet water temperature - outlet water temperature < 4°C, the rotational speed of the second water pump decreases, and the duty cycle decreases by 10% per minute, with adjustment once per minute. If the inlet water temperature - outlet water temperature > 6°C, the rotational speed of the second water pump increases, and the duty cycle increases by 10% per minute, with adjustment once per minute.

[0210] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0211] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. An air conditioner, characterized in that: include: A water tank, wherein the water tank is used to store domestic water; A first heat exchanger, which is located outdoors and is used to exchange heat for the circulating refrigerant; A second heat exchanger, the second heat exchanger is connected to the water tank and is used to exchange heat for the domestic water; A third heat exchanger, the third heat exchanger is located indoors and is used to adjust the indoor temperature; a compressor having an exhaust port; A first pipeline, a second pipeline and a third pipeline, wherein the head end of the first pipeline and the head end of the second pipeline are both used to connect to the exhaust port, the end of the first pipeline and the end of the second pipeline are both used to connect to the head end of the third pipeline, the end of the third pipeline is used to connect to the exhaust port, the first heat exchanger is located on the first pipeline, the second heat exchanger is located on the second pipeline, and the third heat exchanger is located on the third pipeline; A control valve, the control valve is arranged between the exhaust port and the head end of the first pipeline, the head end of the second pipeline, and the end of the third pipeline, and the control valve is used to change the flow direction of the refrigerant discharged from the exhaust port; A controller is connected to the control valve, and the controller is configured to control the conduction of the control valve according to the operating mode of the air conditioner to guide the refrigerant discharged from the exhaust port into the first pipeline, the second pipeline and / or the third pipeline.

2. The air conditioner according to claim 1, characterized in that: The air conditioner also includes: A liquid storage tank, wherein the outlet of the liquid storage tank is connected to the air inlet of the compressor; a first expansion valve, the first expansion valve being disposed on the first pipeline, and the first expansion valve being used to adjust a refrigerant flow rate in the first pipeline; a second expansion valve, the second expansion valve being disposed on the second pipeline, and the second expansion valve being used to adjust the flow rate of the refrigerant in the second pipeline; a third expansion valve, wherein a first end of the third expansion valve is connected to an end of the first pipeline and an end of the second pipeline, a second end of the third expansion valve is connected to a first end of the third heat exchanger, and the third expansion valve is used to adjust a refrigerant flow rate in the third pipeline; The control valve comprises: a first four-way valve, wherein a D end of the first four-way valve is connected to the exhaust port, a C end of the first four-way valve is connected to the head end of the second pipeline, and an E end of the first four-way valve is connected to an S end of the first four-way valve and then connected to the inlet of the liquid storage tank; a second four-way valve, wherein a D end of the second four-way valve is connected to the exhaust port, an E end of the second four-way valve is connected to an end of the third pipeline, and an S end of the second four-way valve is connected to an inlet of the liquid storage tank; A three-way valve, wherein the first end of the three-way valve is connected to the head end of the first pipeline, the second end of the three-way valve is connected to the C end of the second four-way valve, and the third end of the three-way valve is connected to the inlet of the liquid storage tank.

3. The air conditioner according to claim 2, characterized in that: Regarding controlling the conductance of the control valve according to the operation mode of the air conditioner to guide the refrigerant discharged from the exhaust port into the first pipeline, the second pipeline and / or the third pipeline, the controller is specifically configured as follows: When the operation mode is the cooling mode, the first expansion valve and the third expansion valve are controlled to be opened, the second expansion valve is controlled to be closed, and the C end of the first four-way valve is controlled to be connected with the S end of the first four-way valve, the E end of the first four-way valve is controlled to be connected with the D end of the first four-way valve, the C end of the second four-way valve is controlled to be connected with the D end of the second four-way valve, the E end of the second four-way valve is controlled to be connected with the S end of the second four-way valve, and the first end of the three-way valve is controlled to be connected with the second end of the three-way valve, so as to guide the refrigerant from the exhaust port through the first pipeline and the third pipeline in sequence and then enter the air inlet of the compressor.

4. The air conditioner according to claim 2, characterized in that: Regarding controlling the conductance of the control valve according to the operation mode of the air conditioner to guide the refrigerant discharged from the exhaust port into the first pipeline, the second pipeline and / or the third pipeline, the controller is specifically configured as follows: When the operation mode is the heating mode, the first expansion valve and the third expansion valve are both controlled to be opened, the second expansion valve is controlled to be closed, and the C end of the first four-way valve is controlled to be connected with the S end of the first four-way valve, the E end of the first four-way valve is controlled to be connected with the D end of the first four-way valve, the C end of the second four-way valve is controlled to be connected with the S end of the second four-way valve, the E end of the second four-way valve is controlled to be connected with the D end of the second four-way valve, and the first end of the three-way valve is controlled to be connected with the second end of the three-way valve, so as to guide the refrigerant from the exhaust port through the third pipeline, the first pipeline and then into the air inlet of the compressor.

5. The air conditioner according to claim 2, characterized in that: Regarding controlling the conductance of the control valve according to the operation mode of the air conditioner to guide the refrigerant discharged from the exhaust port into the first pipeline, the second pipeline and / or the third pipeline, the controller is specifically configured as follows: When the operation mode is the simultaneous cooling and hot water making mode, the first expansion valve, the second expansion valve and the third expansion valve are all controlled to be opened, and the C end of the first four-way valve is controlled to be connected with the D end of the first four-way valve, the E end of the first four-way valve is controlled to be connected with the S end of the first four-way valve, the C end of the second four-way valve is controlled to be connected with the D end of the second four-way valve, the E end of the second four-way valve is controlled to be connected with the S end of the second four-way valve, and the first end of the three-way valve is controlled to be connected with the third end of the three-way valve, so as to guide the refrigerant to enter the second pipeline from the exhaust port and to be diverted at the end of the second pipeline so that a part of the refrigerant enters the first pipeline and another part of the refrigerant enters the third pipeline, and finally the refrigerant enters the air inlet of the compressor after converging into the liquid storage tank.

6. The air conditioner according to claim 2, characterized in that: Regarding controlling the conductance of the control valve according to the operation mode of the air conditioner to guide the refrigerant discharged from the exhaust port into the first pipeline, the second pipeline and / or the third pipeline, the controller is specifically configured as follows: When the operation mode is the simultaneous cooling and hot water making mode, the second expansion valve and the third expansion valve are controlled to be opened, the first expansion valve is controlled to be closed, and the C end of the first four-way valve is controlled to be connected with the D end of the first four-way valve, the E end of the first four-way valve is controlled to be connected with the S end of the first four-way valve, the C end of the second four-way valve is controlled to be connected with the D end of the second four-way valve, the E end of the second four-way valve is controlled to be connected with the S end of the second four-way valve, and the first end of the three-way valve is controlled to be connected with the second end of the three-way valve, so as to guide the refrigerant from the exhaust port through the second pipeline and the third pipeline in sequence and enter the air inlet of the compressor.

7. The air conditioner according to claim 2, characterized in that: Regarding controlling the conductance of the control valve according to the operation mode of the air conditioner to guide the refrigerant discharged from the exhaust port into the first pipeline, the second pipeline and / or the third pipeline, the controller is specifically configured as follows: When the operation mode is the simultaneous cooling and hot water making mode, the first expansion valve, the second expansion valve and the third expansion valve are all controlled to be opened, and the C end of the first four-way valve is controlled to be connected with the D end of the first four-way valve, the E end of the first four-way valve is controlled to be connected with the S end of the first four-way valve, the C end of the second four-way valve is controlled to be connected with the D end of the second four-way valve, the E end of the second four-way valve is controlled to be connected with the S end of the second four-way valve, and the first end of the three-way valve is controlled to be connected with the second end of the three-way valve, so as to guide a part of the refrigerant into the first pipeline, and guide another part of the refrigerant into the second pipeline, and then enter the air inlet of the compressor after the refrigerant converges into the third pipeline.

8. The air conditioner according to claim 2, characterized in that: Regarding controlling the conductance of the control valve according to the operation mode of the air conditioner to guide the refrigerant discharged from the exhaust port into the first pipeline, the second pipeline and / or the third pipeline, the controller is specifically configured as follows: When the operation mode is the hot water making mode, the first expansion valve and the second expansion valve are both controlled to be opened, the third expansion valve is controlled to be closed, and the C end of the first four-way valve is controlled to be connected with the D end of the first four-way valve, the E end of the first four-way valve is controlled to be connected with the S end of the first four-way valve, the C end of the second four-way valve is controlled to be connected with the D end of the second four-way valve, the E end of the second four-way valve is controlled to be connected with the S end of the second four-way valve, and the first end of the three-way valve is controlled to be connected with the third end of the three-way valve, so as to guide the refrigerant from the exhaust port through the second pipeline, the first pipeline and then into the air inlet of the compressor.

9. The air conditioner according to claim 2, characterized in that: Regarding controlling the conductance of the control valve according to the operation mode of the air conditioner to guide the refrigerant discharged from the exhaust port into the first pipeline, the second pipeline and / or the third pipeline, the controller is specifically configured as follows: When the operation mode is the simultaneous heating and hot water mode, the first expansion valve, the second expansion valve and the third expansion valve are all controlled to be opened, and the C end of the first four-way valve is controlled to be connected with the D end of the first four-way valve, the E end of the first four-way valve is controlled to be connected with the S end of the first four-way valve, the C end of the second four-way valve is controlled to be connected with the S end of the second four-way valve, the E end of the second four-way valve is controlled to be connected with the D end of the second four-way valve, and the first end of the three-way valve is controlled to be connected with the second end of the three-way valve, so as to guide a part of the refrigerant into the third pipeline, and guide another part of the refrigerant into the second pipeline, and then enter the air inlet of the compressor after the refrigerant converges into the first pipeline.

10. The air conditioner according to claim 2, characterized in that: Regarding controlling the conductance of the control valve according to the operation mode of the air conditioner to guide the refrigerant discharged from the exhaust port into the first pipeline, the second pipeline and / or the third pipeline, the controller is specifically configured as follows: When the operation mode is the defrost mode, the first expansion valve and the third expansion valve are both controlled to be opened, the second expansion valve is controlled to be closed, and the C end of the first four-way valve is controlled to be connected to the S end of the first four-way valve, the E end of the first four-way valve is controlled to be connected to the D end of the first four-way valve, the C end of the second four-way valve is controlled to be connected to the D end of the second four-way valve, the E end of the second four-way valve is controlled to be connected to the S end of the second four-way valve, and the first end of the three-way valve is controlled to be connected to the second end of the three-way valve, so as to guide the refrigerant to enter the air inlet of the compressor from the exhaust port through the first pipeline and the third pipeline in sequence; Alternatively, when the operating mode is the defrost mode, the first expansion valve and the second expansion valve are both controlled to be open, the third expansion valve is controlled to be closed, and the C end of the first four-way valve is controlled to be connected with the S end of the first four-way valve, the E end of the first four-way valve is controlled to be connected with the D end of the first four-way valve, the C end of the second four-way valve is controlled to be connected with the D end of the second four-way valve, the E end of the second four-way valve is controlled to be connected with the S end of the second four-way valve, and the first end of the three-way valve is controlled to be connected with the second end of the three-way valve, so as to guide the refrigerant from the exhaust port through the first pipeline and the second pipeline in sequence and then enter the air inlet of the compressor.

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