Air conditioner

Abstract

The utility model discloses an air conditioner which comprises a control valve, the control valve is 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 valve is 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 utility model relates to the technical field of air conditioning, in particular to an air conditioner. Background Art

[0002] In the related art, 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 in cooling or heating operation. However, after the refrigerant is discharged from the compressor, no matter what mode the air conditioner is in, it will first pass through the water tank to heat the water in the water tank, so that the air conditioner will have insufficient or excessive cooling or heating capacity. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide an air conditioner that can change the flow direction of the refrigerant discharged from the compressor exhaust port according to different operating modes, thereby avoiding the problem of insufficient or excessive cooling or heating capacity caused by the refrigerant first heating the water tank while providing the air conditioner with multiple operating modes.

[0004] In order to solve the above problems, an embodiment of the first aspect of the present invention proposes an air conditioner, which includes: a water tank, which is used to store domestic water; a first heat exchanger, which is located outdoors and is used to exchange heat for a circulating refrigerant; a second heat exchanger, which is connected to the water tank and is used to exchange heat for the domestic water; a third heat exchanger, which is located indoors and is used to adjust the indoor temperature; a compressor, which has 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 be connected to the exhaust port, and the end of the first pipeline and the end of the second pipeline are both used to be connected to the head end of the third pipeline. , the end of the third pipeline is used to be connected 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, the control valve is used to change the flow direction of the refrigerant discharged from the exhaust port; a controller, the 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.

[0005] According to the air conditioner of the embodiment of the present invention, the three heat exchangers are respectively arranged on different pipelines, and a control valve is provided between each pipeline and the exhaust port of the compressor. Therefore, when the compressor discharges the refrigerant, the refrigerant is no longer simply passed through the water tank first, but the conduction of the control valve is controlled based on the operating mode of the air conditioner, thereby selectively controlling the refrigerant discharged from the exhaust port to enter the first pipeline, the second pipeline and / or the third pipeline, thereby realizing that the air conditioner has multiple different operating modes while avoiding the problem of insufficient or excessive cooling or heating capacity caused by the refrigerant heating the water tank first.

[0006] In some embodiments, the air conditioner further includes: a liquid storage tank, the outlet of the liquid storage tank is connected to the air 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 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 in the second pipeline; a third expansion valve, a first end of the third expansion valve is connected to the end of the first pipeline and the end of the second pipeline, and a 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 in the third pipeline; The control valve includes: a first four-way valve, wherein 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, the E end of the first four-way valve 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, wherein 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, 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.

[0007] 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 refrigerant discharged from the exhaust port is selectively controlled to enter the first pipeline, the second pipeline and / or the third pipeline by controlling the conduction status of each valve, thereby realizing the air conditioner with multiple different operating modes while avoiding the problem of insufficient or excessive cooling or heating capacity caused by the refrigerant heating the water tank first.

[0008] In some embodiments, for controlling 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, the controller is specifically configured as follows: when the operating mode is the cooling mode, controlling the first expansion valve and the third expansion valve to be opened, controlling the second expansion valve to be closed, and controlling the C end of the first four-way valve to be connected with the S end of the first four-way valve, the E end of the first four-way valve to be connected with the D end of the first four-way valve, the C end of the second four-way valve to be connected with the D end of the second four-way valve, the E end of the second four-way valve to be connected with the S end of the second four-way valve, and the first end of the three-way valve 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 into the air inlet of the compressor.

[0009] 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 refrigeration mode can be effectively realized through the above control method to meet the user's refrigeration needs.

[0010] In some embodiments, for controlling 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, the controller is specifically configured as follows: when the operating mode is the heating mode, controlling the first expansion valve and the third expansion valve to be opened, controlling the second expansion valve to be closed, and controlling the C end of the first four-way valve to be connected with the S end of the first four-way valve, the E end of the first four-way valve to be connected with the D end of the first four-way valve, the C end of the second four-way valve to be connected with the S end of the second four-way valve, the E end of the second four-way valve to be connected with the D end of the second four-way valve, and the first end of the three-way valve 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.

[0011] 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 heating mode can be effectively realized through the above control method to meet the user's heating needs.

[0012] In some embodiments, for controlling 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, the controller is specifically configured to: when the operating mode is the simultaneous cooling and hot water mode, control the first expansion valve, the second expansion valve and the third expansion valve to be opened, and control the C end of the first four-way valve to be connected to the D end of the first four-way valve, the E end of the first four-way valve to be connected to the S end of the first four-way valve, the C end of the second four-way valve to be connected to the D end of the second four-way valve, the E end of the second four-way valve to be connected to the S end of the second four-way valve, and the first end of the three-way valve to be connected to the third end of the three-way valve, so as to guide the refrigerant from the exhaust port into the second pipeline, and to 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 the refrigerant enters the air inlet of the compressor after converging into the liquid storage tank.

[0013] 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, the above control method can simultaneously meet the user's cooling and hot water needs.

[0014] In some embodiments, for controlling 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, the controller is specifically configured as follows: when the operating mode is the simultaneous cooling and hot water mode, controlling the second expansion valve and the third expansion valve to be opened, controlling the first expansion valve to be closed, and controlling the C end of the first four-way valve to be connected with the D end of the first four-way valve, the E end of the first four-way valve to be connected with the S end of the first four-way valve, the C end of the second four-way valve to be connected with the D end of the second four-way valve, the E end of the second four-way valve to be connected with the S end of the second four-way valve, and the first end of the three-way valve 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 into the air inlet of the compressor.

[0015] 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, the above control method can simultaneously meet the user's cooling and hot water needs.

[0016] In some embodiments, for controlling 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, the controller is specifically configured as: when the operating mode is the simultaneous cooling and hot water mode, controlling the first expansion valve, the second expansion valve and the third expansion valve to be opened, and controlling the C end of the first four-way valve to be connected with the D end of the first four-way valve, the E end of the first four-way valve to be connected with the S end of the first four-way valve, the C end of the second four-way valve to be connected with the D end of the second four-way valve, the E end of the second four-way valve to be connected with the S end of the second four-way valve, and the first end of the three-way valve 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 after the refrigerant converges into the third pipeline, it enters the air inlet of the compressor.

[0017] 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, the above control method can simultaneously meet the user's cooling and hot water needs.

[0018] In some embodiments, for controlling 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, the controller is specifically configured as follows: when the operating mode is the hot water making mode, controlling the first expansion valve and the second expansion valve to be opened, controlling the third expansion valve to be closed, and controlling the C end of the first four-way valve to be connected with the D end of the first four-way valve, the E end of the first four-way valve to be connected with the S end of the first four-way valve, the C end of the second four-way valve to be connected with the D end of the second four-way valve, the E end of the second four-way valve to be connected with the S end of the second four-way valve, and the first end of the three-way valve 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 and the first pipeline in sequence and then into the air inlet of the compressor.

[0019] 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 effectively realize the hot water making mode to meet the user's hot water making needs.

[0020] In some embodiments, for controlling 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, the controller is specifically configured as follows: when the operating mode is the simultaneous heating and hot water mode, controlling the first expansion valve, the second expansion valve and the third expansion valve to be opened, and controlling the C end of the first four-way valve to be connected to the D end of the first four-way valve, the E end of the first four-way valve to be connected to the S end of the first four-way valve, the C end of the second four-way valve to be connected to the S end of the second four-way valve, the E end of the second four-way valve to be connected to the D end of the second four-way valve, and the first end of the three-way valve to be connected to 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.

[0021] 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, the above control method can simultaneously meet the user's heating demand and hot water demand.

[0022] In some embodiments, for controlling 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, the controller is specifically configured to: when the operating mode is the defrost mode, control the first expansion valve and the third expansion valve to be both opened, control the second expansion valve to be closed, and control the C end of the first four-way valve to be connected to the S end of the first four-way valve, the E end of the first four-way valve to be connected to the D end of the first four-way valve, the C end of the second four-way valve to be connected to the D end of the second four-way valve, the E end of the second four-way valve to be connected to the S end of the second four-way valve, and the first end of the three-way valve to be connected to 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; or, when the operating mode is the defrost mode, control the first expansion valve and the second expansion valve to be opened, control the third expansion valve to be closed, and control the C end of the first four-way valve to be connected with the S end of the first four-way valve, the E end of the first four-way valve to be connected with the D end of the first four-way valve, the C end of the second four-way valve to be connected with the D end of the second four-way valve, the E end of the second four-way valve to be connected with the S end of the second four-way valve, and the first end of the three-way valve 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.

[0023] 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 defrost mode can be effectively realized through the above control method to meet the user's defrost needs.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through 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 readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0026] Figure 1 1 is a structural diagram of an air conditioner according to an embodiment of the present utility model;

[0027] Figure 2 is a schematic diagram of the refrigerant flow of an air conditioner according to an embodiment of the present utility model;

[0028] Figure 3 is a schematic diagram of refrigerant flow in an air conditioner according to another embodiment of the present utility model;

[0029] Figure 4 is a schematic diagram of refrigerant flow in an air conditioner according to another embodiment of the present utility model;

[0030] Figure 5 is a schematic diagram of refrigerant flow in an air conditioner according to another embodiment of the present utility model;

[0031] Figure 6 is a schematic diagram of refrigerant flow in an air conditioner according to another embodiment of the present utility model;

[0032] Figure 7 is a schematic diagram of refrigerant flow in an air conditioner according to another embodiment of the present utility model;

[0033] Figure 8 is a schematic diagram of refrigerant flow in an air conditioner according to another embodiment of the present utility model;

[0034] Figure 9 is a schematic diagram of refrigerant flow in an air conditioner according to another embodiment of the present utility model;

[0035] Figure 10 is a structural schematic diagram of an air conditioner according to another embodiment of the present utility model;

[0036] Figure 11 is a schematic diagram of refrigerant flow in an air conditioner according to another embodiment of the present utility model;

[0037] Figure 12 is a schematic diagram of refrigerant flow in an air conditioner according to another embodiment of the present utility model;

[0038] Figure 13 is a schematic diagram of refrigerant flow in an air conditioner according to another embodiment of the present utility model;

[0039] Figure 14 is a schematic diagram of refrigerant flow in an air conditioner according to another embodiment of the present utility model;

[0040] Figure 15 is a flow chart of a method for controlling an air conditioner according to another embodiment of the present invention;

[0041] Figure 16 1 is a structural diagram of an air conditioner according to an embodiment of the present utility model;

[0042] Figure 17 is a schematic diagram of the refrigerant flow of an air conditioner according to an embodiment of the present utility model;

[0043] Figure 18 is a schematic diagram of refrigerant flow in an air conditioner according to another embodiment of the present utility model;

[0044] Figure 19 This is a table schematic diagram of the variation range of the operating frequency of the compressor according to one embodiment of the present utility model;

[0045] Figure 20 is a table schematic diagram of a second opening increment according to an embodiment of the present utility model;

[0046] Figure 21 is a table schematic diagram of a third opening increment according to an embodiment of the present utility model;

[0047] Figure 22 It is a tabular diagram illustrating the action trends of three expansion valves according to one embodiment of the present utility model.

[0048] Reference numerals:

[0049] air conditioner 100;

[0050] 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

[0051] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0052] The air conditioner in this application 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 supplies refrigerant to the air that has been conditioned and heat exchanged.

[0053] The compressor compresses high-temperature, high-pressure refrigerant gas and discharges the compressed gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, releasing heat into the surrounding environment through the condensation process.

[0054] The expansion valve expands the high-temperature, high-pressure liquid refrigerant condensed in the condenser to a lower-pressure liquid. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves cooling by utilizing the latent heat of evaporation to exchange heat with the material being cooled. Throughout this cycle, the air conditioner regulates the temperature of the indoor space.

[0055] The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.

[0056] The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger functions as a condenser, the air conditioner functions as a heater in heating mode, and when the indoor heat exchanger functions as an evaporator, the air conditioner functions as a cooler in cooling mode.

[0057] With the popularization of air-conditioning products, users pay more and more attention to the utilization of waste heat from air conditioners. However, the comprehensive energy utilization efficiency will be affected if only all or part of the heat can be recovered. Therefore, current air conditioners should conduct further research on the recovery of waste heat generated by air conditioners.

[0058] In order to solve the above problems, the first embodiment of the present invention provides an air conditioner, which can change the flow direction of the refrigerant according to different operating modes. While the air conditioner has multiple operating modes, it avoids the problem of insufficient or excessive cooling or heating capacity caused by the refrigerant heating the water tank first.

[0059] Reference below Figure 1 An air conditioner 100 according to an embodiment of the present invention is described. 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.

[0060] 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 for the circulating refrigerant; the second heat exchanger 4 is connected to the water tank 2 and is used to exchange heat for 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 trigeneration unit.

[0061] The head end of the first pipeline and the head end of the second pipeline are both used to be connected to the exhaust port, the terminal end of the first pipeline and the terminal end of the second pipeline are both used to be connected to the head end of the third pipeline, and the terminal end of the third pipeline is used to be connected 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, and the third heat exchanger 5 is located on the third pipeline. 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 terminal end of the third pipeline. The control valve is used to change the flow direction of the refrigerant discharged from the exhaust port. The controller is connected to the control valve, and the controller is configured to: control the conductance of the control valve 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. Based on the above-mentioned architecture of the air conditioner 100, the controller of the air conditioner 100 is configured to control the conductance of the control valve 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.

[0062] Specifically, in order to solve the above problems, in the present 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 exhaust port of the compressor 1 is connected to the first heat exchanger 3 through the first pipeline, the exhaust port of the compressor 4 is connected to the second heat exchanger 4 through the second pipeline, and the end of the first pipeline and the second pipeline and the exhaust port of the compressor 4 are connected through the third pipeline. The second heat exchanger 4 is controlled separately as one channel, and control valves are provided on the first pipeline, the second pipeline and the third pipeline to control the conduction of the control valve according to the operating mode of the air conditioner 100, thereby changing the flow direction of the refrigerant out of the exhaust port of the compressor 1, so that the refrigerant flows into the second heat exchanger 4 to heat the 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. In this way, the air conditioner 100 can realize multiple operating modes and avoid the problem of insufficient or excessive cooling or heating capacity of the air conditioner 100 due to heating the water tank 2 first. Therefore, compared with the prior art, no matter what mode the air conditioner 100 is in, the refrigerant will first pass through the water tank 2 to heat the water in the water tank 2. The present application uses the exhaust port of the compressor 4 to lead out the first pipeline and the second pipeline, and controls the second heat exchanger 4 as a separate path, instead of being connected in series between the compressor 4 and other heat exchangers, and setting a control valve to change the refrigerant flow direction according to the operating mode of the air conditioner 100. If the operating mode does not require heating the water tank 2, the refrigerant can be prevented from entering the second heat exchanger 4 and does not have to pass through the second heat exchanger 4. In this way, the air conditioner 100 can achieve multiple operating modes and avoid the problem of insufficient or excessive cooling or heating capacity of the air conditioner 100 due to heating the water tank 2 first. If the operating mode requires heating the water tank, the refrigerant can enter the second heat exchanger 4 to achieve hot water production during heating or cooling, thereby improving the comfort of the air conditioner 100, and reducing energy waste by producing hot water while cooling. The control valve may be a variety of valves, such as a solenoid valve, an expansion valve, a three-way valve, a four-way valve, etc., which are not specifically limited here. The following description will be made taking the solenoid valve as an example.

[0063] 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 provided inside the water tank 2 to keep the domestic water inside the water tank 2 warm to avoid energy waste.

[0064] For example, if it is determined that the operating mode of the air conditioner 100 has cooling but no hot water demand, the conductance of the solenoid valves on the first pipeline, the second pipeline and the third pipeline is controlled so that the refrigerant discharged from the compressor 1 through the exhaust port passes through the first pipeline and the third pipeline in sequence and then enters the air inlet of the compressor 1; or the operating mode of the air conditioner 100 has heating but no hot water demand, at this time the refrigerant discharged from the compressor 1 through the exhaust port passes through the third pipeline and the first pipeline in sequence and then enters the air inlet of the compressor 1; or the operating mode of the air conditioner 100 has cooling and hot water demand, then the conductance of the solenoid valves on the first pipeline, the second pipeline and the third pipeline is controlled so that the refrigerant discharged from the compressor 1 through the exhaust port passes through the third pipeline and the first pipeline in sequence and then enters the air inlet of the compressor 1. The refrigerant discharged from the compressor 1 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, the other part passes through the third pipeline and finally enters the air inlet of the compressor 1; or the operation mode of the air conditioner 100 has cooling and hot water requirements, then by controlling the conduction of the solenoid valves on the first pipeline, the second pipeline and the third pipeline, 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 enters the air inlet of the compressor 1 after passing through the third pipeline; or the operation mode of the air conditioner 100 has cooling and hot water requirements, then by controlling the conduction of the solenoid valves on the first pipeline, the second pipeline and the third pipeline, 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 enters the air inlet of the compressor 1 after passing through the third pipeline; The conduction status of the solenoid valves on the first, second and third pipelines is controlled so that 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 then enters the air inlet of the compressor 1 through the third pipeline; or the operation mode of the air conditioner 100 has cooling and hot water requirements, then the conduction status of the solenoid valves on the first, second and third pipelines is controlled so that 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 converging, enters the third pipeline and enters the air inlet of the compressor 1; or the operation mode of the air conditioner 100 has only hot water requirements , by controlling the conductance of the solenoid valves on the first pipeline, the second pipeline, and the third pipeline, 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 air inlet of the compressor 1 through the first pipeline; or the operation mode of the air conditioner 100 has heating and hot water needs, by controlling the conductance of the solenoid valves on the first pipeline, the second pipeline, and the third pipeline, 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 merging, passes through the first pipeline and then enters the air inlet of the compressor 1;Alternatively, if defrosting is required in the operating mode of the air conditioner 100, the solenoid valves on the first, second, and third pipelines are controlled so that the refrigerant discharged from the exhaust port of the compressor 1 passes through the first pipeline and then returns to the exhaust port of the compressor 1 through the third pipeline, or passes through the second pipeline and flows through the second heat exchanger 4 to heat the domestic water stored in the water tank 2 before returning to the air inlet of the compressor 1. This allows the air conditioner 100 to have multiple different operating modes while avoiding the problem of insufficient or excessive cooling or heating capacity caused by the refrigerant first heating the water tank.

[0065] According to the air conditioner 100 of the embodiment of the present invention, the three heat exchangers are respectively arranged on different pipelines, and a control valve is provided between each pipeline and the exhaust port of the compressor. Therefore, when the compressor discharges the refrigerant, the refrigerant is no longer simply passed through the water tank first, but the conduction of the control valve is controlled based on the operating mode of the air conditioner, thereby selectively controlling the refrigerant discharged from the exhaust port to enter the first pipeline, the second pipeline and / or the third pipeline, thereby realizing that the air conditioner has multiple different operating modes while avoiding the problem of insufficient or excessive cooling or heating capacity caused by the refrigerant heating the water tank first.

[0066] In some embodiments, as Figure 1 As 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 , and the control valve includes a first four-way valve 10 , a second four-way valve 11 and a three-way valve 12 .

[0067] Among them, the outlet of the liquid storage tank 6 is connected to the air inlet 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 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 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, and 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 in the third pipeline; the D end of the first four-way valve 10 is connected to the exhaust 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 is connected to the S end of the first four-way valve 10 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.

[0068] For example, if it is determined that the operating mode of the air conditioner 100 has cooling but no hot water demand, the conductance of the first four-way valve 10, the second four-way valve 11 and the three-way valve 12 is controlled so that the refrigerant discharged from the compressor 1 through the exhaust port passes through the first pipeline and the third pipeline in sequence and then enters the air inlet of the compressor 1; or the operating mode of the air conditioner 100 has heating but no hot water demand, at this time the refrigerant discharged from the compressor 1 through the exhaust port passes through the third pipeline and the first pipeline in sequence and then enters the air inlet of the compressor 1; or the operating mode of the air conditioner 100 has cooling and hot water demand, then the conductance of the first four-way valve 10, the second four-way valve 11 and the three-way valve 12 is controlled so that the refrigerant discharged from the compressor 1 through the exhaust port passes through the third pipeline and the first pipeline in sequence and then enters the air inlet of the compressor 1. The refrigerant discharged from the compressor 1 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, the other part passes through the third pipeline and finally enters the air inlet of the compressor 1; or the operation mode of the air conditioner 100 has cooling and hot water requirements, 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 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 enters the air inlet of the compressor 1 after passing through the third pipeline; or the operation mode of the air conditioner 100 has cooling and hot water requirements, then by controlling the conduction of the first four-way valve 10, the second four-way valve 11 and the three-way valve 12, 1 and the conductance of the three-way valve 12, 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 air inlet of the compressor 1 through the third pipeline; or the operating mode of the air conditioner 100 has cooling and hot water requirements, then by controlling the conductance of the first four-way valve 10, the second four-way valve 11 and the three-way valve 12, 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 converging, enters the third pipeline and enters the air inlet of the compressor 1; or the operating mode of the air conditioner 100 only has hot water requirements, By controlling the conductance of the first four-way valve 10, the second four-way valve 11 and the three-way valve 12, 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 air inlet of the compressor 1 through the first pipeline; or if the operation mode of the air conditioner 100 has heating and hot water requirements, the conductance of the first four-way valve 10, the second four-way valve 11 and the three-way valve 12 is controlled so that 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 merging, passes through the first pipeline and then enters the air inlet of the compressor 1;Alternatively, if defrosting is required in the operating mode of the air conditioner 100, the conductance 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 exhaust port of the compressor 1 passes through the first pipeline and then returns to the exhaust port of the compressor 1 through the third pipeline, or passes through the second pipeline and flows through the second heat exchanger 4 to heat the domestic water stored in the water tank 2 before returning to the air inlet of the compressor 1. Furthermore, the refrigerant flow rates in the first, second, and third pipelines are adjusted respectively by the first expansion valve 7, the second expansion valve 8, and the third expansion valve 9. The refrigerant flow rates are precisely distributed according to actual needs, thereby enabling the air conditioner 100 to have multiple different operating modes while avoiding the problem of insufficient or excessive cooling or heating capacity caused by the refrigerant first heating the water tank.

[0069] In an embodiment, Figure 1 As shown, the air conditioner 100 further includes an economizer 13 , a second liquid storage tank 14 and a fourth expansion valve 15 .

[0070] Specifically, economizer 13 is used to adapt to the enthalpy-increasing compressor, improving heating performance in low-temperature environments. By recovering some of the refrigerant's energy, it increases the suction enthalpy of compressor 1, thereby improving the heating capacity and energy efficiency of air conditioner 100. Fourth expansion valve 15 is used to regulate the refrigerant flow entering economizer 13. Due to varying refrigerant demands in different modes, a second liquid storage tank 14 is provided to store excess refrigerant to balance the refrigerant flow, thereby preventing air conditioner malfunctions caused by excessive or insufficient refrigerant. Economizer 13 can be a plate heat exchanger or a double-tube heat exchanger for refrigerant-to-refrigerant heat exchange, without specific limitations herein.

[0071] In some embodiments, in order to control the conduction of the control valve 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 100 is specifically configured to control the first expansion valve 7 and the third expansion valve 9 to be opened, control the second expansion valve 8 to be closed, and control the C end of the first four-way valve 10 to be connected with the S end of the first four-way valve 10, the E end of the first four-way valve 10 to be connected with the D end of the first four-way valve 10, the C end of the second four-way valve 11 to be connected with the D end of the second four-way valve 11, the E end of the second four-way valve 11 to be connected with the S end of the second four-way valve 11, and the first end of the three-way valve 12 to be connected with the second end of the three-way valve 12, so as to guide the refrigerant from the exhaust port through the first pipeline and the third pipeline in sequence and enter the air intake of the compressor 1.

[0072] 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 be open, the second expansion valve 8 is controlled to be closed, and the C end of the first four-way valve 10 is controlled to be connected to the S end of the first four-way valve 10, the E end of the first four-way valve 10 is controlled to be connected to the D end of the first four-way valve 10, the C end of the second four-way valve 11 is controlled to be connected to the D end of the second four-way valve 11, the E end of the second four-way valve 11 is controlled to be connected to the S end of the second four-way valve 11, and the first end of the three-way valve 12 is controlled to be connected to the second end of the three-way valve 12. At this time, the refrigerant flow direction is referenced Figure 2 As shown, 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 from the first end of the three-way valve 12. It 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, achieving a cooling effect. It 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 air inlet of the compressor 1. Thus, the air conditioner 100 completes the cooling operation mode.

[0073] According to the configuration of the controller of the above embodiment, when the operating mode of the air conditioner 100 is the cooling mode, the effect of guiding the flow of the refrigerant is achieved 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. After being discharged from the exhaust port of the compressor 1, the refrigerant passes through the first pipeline and the third pipeline in sequence and then enters the air inlet of the compressor 1, so that the air conditioner 100 completes the cooling operation mode.

[0074] 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 control the first expansion valve 7 and the third expansion valve 9 to be opened, control the second expansion valve 8 to be closed, and control the C end of the first four-way valve 10 to be connected with the S end of the first four-way valve 10, the E end of the first four-way valve 10 to be connected with the D end of the first four-way valve 10, the C end of the second four-way valve 11 to be connected with the S end of the second four-way valve 11, the E end of the second four-way valve 11 to be connected with the D end of the second four-way valve 11, and the first end of the three-way valve 12 to be connected with the second end of the three-way valve 12, so as to guide the refrigerant from the exhaust port through the third pipeline, the first pipeline and then into the air intake of the compressor 1.

[0075] Specifically, if 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 be open, the second expansion valve 8 is controlled to be closed, and the C end of the first four-way valve 10 is controlled to be connected to the S end of the first four-way valve 10, the E end of the first four-way valve 10 is controlled to be connected to the D end of the first four-way valve 10, the C end of the second four-way valve 11 is controlled to be connected to the S end of the second four-way valve 11, the E end of the second four-way valve 11 is controlled to be connected to the D end of the second four-way valve 11, and the first end of the three-way valve 12 is controlled to be connected to the second end of the three-way valve 12. At this time, the refrigerant flow direction is referenced to FIG. Figure 3 As shown, 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 indoor air to achieve a heating effect. The refrigerant then passes through the third expansion valve 9, the second liquid storage tank 14, and the economizer 13. After passing through the economizer 13, a portion of the refrigerant passes through the first expansion valve 7 and enters the first heat exchanger 3, where it absorbs heat from the outdoor air. The refrigerant then flows into the first end of the three-way valve 12, flows from the second end of the three-way valve 12 into the C end of the first four-way valve 10, flows through the S end of the first four-way valve 10 into the liquid storage tank 6, and finally returns to the compressor 1 through the air inlet of the compressor 1. The other portion of the refrigerant returns to the economizer 13 after passing through the fourth expansion valve 15 and is converted into a gaseous state. The refrigerant then flows from the economizer 13 into the air supply and enthalpy increase port of the compressor 1 and returns to the compressor 1. The economizer 13 improves the heating performance of the air conditioner 100, thereby completing the heating operation mode of the air conditioner 100.

[0076] According to the configuration of the controller of the above embodiment, when the operating mode of the air conditioner 100 is the heating mode, the effect of guiding the flow of the refrigerant is achieved 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 refrigerant passes through the third pipeline and the first pipeline in turn and enters the air inlet of the compressor 1, so that the air conditioner 100 completes the heating operation mode and improves the heating performance of the air conditioner 100 through the economizer 13.

[0077] In some embodiments, in order to control the conduction of the control valve 10 according to the operating mode of the air conditioner 100 so as 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 control the first expansion valve 7, the second expansion valve 8 and the third expansion valve 9 to be open when the operating mode is the simultaneous cooling and hot water mode, and to 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, and the E end of the first four-way valve 10 to be connected to the The S end of a four-way valve 10 is connected, the C end of a 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 third end of the three-way valve 12, so as to guide the refrigerant into the second pipeline from the exhaust port, and to be diverted at the end of the second pipeline so that part of the refrigerant enters the first pipeline and the other part of the refrigerant enters the third pipeline, and finally the refrigerant converges into the liquid storage tank 6 and then enters the air inlet of the compressor 1. This control method is suitable for scenarios where the demand for hot water is higher than the demand for cooling. That is to say, when the demand for hot water is high, the refrigerant is controlled to enter the second pipeline where the second heat exchanger is located first to heat domestic water. At the same time, considering the low cooling demand, in order to avoid the problem of excess cooling caused by all the refrigerant discharged from the second pipeline entering the third pipeline, the refrigerant discharged from the second pipeline is diverted, that is, by controlling the opening of the first solenoid valve, a part of the refrigerant discharged from the second pipeline is transported into the first pipeline, thereby limiting the amount of refrigerant in the third pipeline, thereby meeting the hot water demand while ensuring the user's cooling demand.

[0078] Specifically, if it is determined that the operating mode of the air conditioner 100 is the simultaneous cooling and hot water mode, the first expansion valve 7, the second expansion valve 8 and the third expansion valve 9 are all controlled to be open, and the C end of the first four-way valve 10 is controlled to be connected to the D end of the first four-way valve 10, the E end of the first four-way valve 10 is controlled to be connected to the S end of the first four-way valve 10, the C end of the second four-way valve 11 is controlled to be connected to the D end of the second four-way valve 11, the E end of the second four-way valve 11 is controlled to be connected to the S end of the second four-way valve 11, and the first end of the three-way valve 12 is controlled to be connected to the third end of the three-way valve 12. At this time, the refrigerant flow direction is referenced to FIG. Figure 4As shown, the refrigerant discharged from the exhaust port of the compressor 1 flows into the C end of the first four-way valve 10, then flows into the second heat exchanger 4 through the D end of the first four-way valve 10, heating the domestic water stored in the water tank 2. The refrigerant then flows through the second expansion valve 8 and is split. A portion of the refrigerant flows through 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, achieving a cooling effect. The refrigerant then flows into the E end of the second four-way valve 11 and flows out through the S end of the second four-way valve 11. The other portion of the refrigerant flows through the first expansion valve 7 and enters the first heat exchanger 3 for condensation and heat dissipation. The refrigerant then flows into the first end of the three-way valve 12 and flows out through the third end of the three-way valve 12. The two portions of refrigerant merge and enter the liquid storage tank 6. Finally, they return to the compressor 1 through the air inlet of the compressor 1. In this way, the air conditioner 100 completes the simultaneous cooling and hot water operation mode.

[0079] According to the configuration of the controller of the above embodiment, when the operating mode of the air conditioner 100 is the heating mode, the effect of guiding the flow of the refrigerant is achieved 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 refrigerant enters the second pipeline from the exhaust port and is diverted at the end of the second pipeline, so that a part of the refrigerant enters the first pipeline and the other part of the refrigerant enters the third pipeline. Finally, after the refrigerant converges into the liquid storage tank, it enters the air inlet of the compressor, so that the air conditioner 100 completes the simultaneous cooling and hot water operation mode.

[0080] 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 control 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 connected with the D end of the first four-way valve 10, the E end of the first four-way valve 10 to be connected with the S end of the first four-way valve 10, the C end of the second four-way valve 11 to be connected with the D end of the second four-way valve 11, the E end of the second four-way valve 11 to be connected with the S end of the second four-way valve 11, and the first end of the three-way valve 12 to be connected with the second end of the three-way valve 12, so as to guide the refrigerant from the exhaust port through the second pipeline and the third pipeline in sequence and enter the air intake of the compressor 1. This control method is suitable for scenarios where the demand for hot water and cooling is similar, thereby achieving full recovery of waste heat, improving the comprehensive energy utilization rate of the air-conditioning system, and reducing the power consumption of the air conditioner.

[0081] Specifically, if it is determined that the operating mode of the air conditioner 100 is the simultaneous cooling and hot water mode, the second expansion valve 8 and the third expansion valve 9 are both controlled to be open, the first expansion valve 7 is controlled to be closed, and the C end of the first four-way valve 10 is controlled to be connected to the D end of the first four-way valve 10, the E end of the first four-way valve 10 is controlled to be connected to the S end of the first four-way valve 10, the C end of the second four-way valve 11 is controlled to be connected to the D end of the second four-way valve 11, the E end of the second four-way valve 11 is controlled to be connected to the S end of the second four-way valve 11, and the first end of the three-way valve 12 is controlled to be connected to the second end of the three-way valve 12. At this time, the refrigerant flow direction is referenced Figure 5 As shown, 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 into the third expansion valve 9 through the second expansion valve 8, 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, achieving a cooling effect. The refrigerant 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, enters the liquid storage tank 6, and finally returns to the compressor 1 through the air inlet of the compressor 1. In this way, the air conditioner 100 completes the simultaneous cooling and hot water operation mode.

[0082] According to the configuration of the controller of the above embodiment, when the operating mode of the air conditioner 100 is the simultaneous cooling and hot water making mode, the effect of guiding the flow of the refrigerant is achieved 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 refrigerant enters the air inlet of the compressor 1 from the exhaust port through the second pipeline and the third pipeline in sequence, so that the air conditioner 100 completes the simultaneous cooling and hot water making operating mode.

[0083] 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 control the first expansion valve 7, the second expansion valve 8 and the third expansion valve 9 to be opened when the operating mode is the simultaneous cooling and hot water mode, and to control the C end of the first four-way valve 10 to be connected with the D end of the first four-way valve 10, the E end of the first four-way valve 10 to be connected with the S end of the first four-way valve 10, the C end of the second four-way valve 11 to be connected with the D end of the second four-way valve 11, the E end of the second four-way valve 11 to be connected with the S end of the second four-way valve 11, and the first end of the three-way valve 12 to be connected with the second end of the three-way valve 12, 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 1 after the refrigerant converges into the third pipeline. This control method is suitable for scenarios where the demand for hot water is lower than the demand for cooling. That is to say, when the demand for hot water is lower than the demand for cooling, the refrigerant is controlled to be diverted at the exhaust port, and a part of it enters the second pipeline where the second heat exchanger is located, thereby limiting the amount of refrigerant in the second pipeline to heat domestic water. At the same time, considering the high demand for cooling, the other part of the refrigerant enters the first pipeline, and then the refrigerant in the first pipeline and the refrigerant in the second pipeline merge into the third pipeline to ensure the user's cooling needs.

[0084] Specifically, if it is determined that the operating mode of the air conditioner 100 is the simultaneous cooling and hot water mode, the first expansion valve 7, the second expansion valve 8 and the third expansion valve 9 are all controlled to be open, and the C end of the first four-way valve 10 is controlled to be connected to the D end of the first four-way valve 10, the E end of the first four-way valve 10 is controlled to be connected to the S end of the first four-way valve 10, the C end of the second four-way valve 11 is controlled to be connected to the D end of the second four-way valve 11, the E end of the second four-way valve 11 is controlled to be connected to the S end of the second four-way valve 11, and the first end of the three-way valve 12 is controlled to be connected to the second end of the three-way valve 12. At this time, the refrigerant flow direction is referenced Figure 6As shown, that is, 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 flows into the first heat exchanger 3 from the first end of the three-way valve 12, where it condenses and releases heat, and then passes through the first expansion valve 7; the other 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. The two parts of the refrigerant merge 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 a cooling effect, and 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 air inlet of the compressor 1, thereby completing the simultaneous cooling and hot water operation mode of the air conditioner 100.

[0085] According to the configuration of the controller of the above embodiment, when the operating mode of the air conditioner 100 is the simultaneous cooling and hot water making 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 the other part of the refrigerant is guided to enter the second pipeline, and after the refrigerant converges into the third pipeline, it enters the air inlet of the compressor 1, thereby realizing that the air conditioner 100 completes the simultaneous cooling and hot water making operating mode.

[0086] 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 control 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 connected with the D end of the first four-way valve, the E end of the first four-way valve to be connected with the S end of the first four-way valve, the C end of the second four-way valve to be connected with the D end of the second four-way valve, the E end of the second four-way valve to be connected with the S end of the second four-way valve, and the first end of the three-way valve 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 and the first pipeline in sequence and then enter the air inlet of the compressor 1.

[0087] Specifically, if it is determined that the operating mode of the air conditioner 100 is the hot water 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 to the D end of the first four-way valve, the E end of the first four-way valve is controlled to be connected to the S 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 third end of the three-way valve. At this time, the refrigerant flow direction is referenced to Figure 7 As shown, 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 into the first heat exchanger 3 after passing through the second expansion valve 8 and the first expansion valve 7 to absorb heat from the outdoor air, then flows into the first end of the three-way valve 12, flows from the second end of the three-way valve 12 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 air inlet of the compressor 1. In this way, the air conditioner 100 completes the hot water production operation mode.

[0088] According to the configuration of the controller of the above embodiment, when the operating mode of the air conditioner 100 is the hot water making mode, the effect of guiding the flow of the refrigerant is achieved 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 refrigerant flows from the exhaust port through the second pipeline and the first pipeline in sequence and then enters the air inlet of the compressor 1, so that the air conditioner 100 completes the hot water making operating mode.

[0089] 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 control the first expansion valve 7, the second expansion valve 8 and the third expansion valve 9 to be opened when the operating mode is the simultaneous heating and hot water mode, and to control the C end of the first four-way valve 10 to be connected with the D end of the first four-way valve 10, the E end of the first four-way valve 10 to be connected with the S end of the first four-way valve 10, the C end of the second four-way valve 11 to be connected with the S end of the second four-way valve 11, the E end of the second four-way valve 11 to be connected with the D end of the second four-way valve 11, and the first end of the three-way valve 12 to be connected with the second end of the three-way valve 12, 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 1 after the refrigerant converges into the first pipeline.

[0090] Specifically, if it is determined that the operating mode of the air conditioner 100 is the simultaneous heating and hot water mode, the first expansion valve 7, the second expansion valve 8 and the third expansion valve 9 are all controlled to be open, and the C end of the first four-way valve 10 is controlled to be connected to the D end of the first four-way valve 10, the E end of the first four-way valve 10 is controlled to be connected to the S end of the first four-way valve 10, the C end of the second four-way valve 11 is controlled to be connected to the S end of the second four-way valve 11, the E end of the second four-way valve 11 is controlled to be connected to the D end of the second four-way valve 11, and the first end of the three-way valve 12 is controlled to be connected to the second end of the three-way valve 12. At this time, the refrigerant flow direction is referenced Figure 8 As shown, that is to say, 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, and exchanges heat with the low-temperature air in the room in the third heat exchanger 5 to achieve a heating effect, and then passes through the third expansion valve 9, the second liquid storage tank 12, and the economizer 13; the other 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 pass through the first expansion valve 7 and enter the E end of the second four-way valve 11, 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 air inlet 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; the other part of the refrigerant returns to the economizer 13 after passing through the fourth expansion valve 15 and is converted into gas. Then, it flows from the economizer 13 into the air supply 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, thereby completing the simultaneous heating and hot water operation mode of the air conditioner 100.

[0091] According to the configuration of the controller of 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 flow of the refrigerant is achieved, a part of the refrigerant enters the third pipeline, and the other part of the refrigerant is guided to enter the second pipeline, and after the refrigerant converges into the first pipeline, it enters the air inlet of the compressor 1, so that the air conditioner 100 completes the simultaneous heating and hot water operation mode.

[0092] 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 defrost mode, control the first expansion valve 7 and the third expansion valve 9 to be open, control the second expansion valve 8 to be closed, 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 D end of the second four-way valve 11, the E end of the second four-way valve 11 to be connected to the S end of the second four-way valve 11, the first end of the three-way valve 12 to be connected to the third end of the three-way valve 12 The two ends are connected 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 1; or, when the operating mode is the defrost mode, the first expansion valve 7 and the second expansion valve 8 are controlled to be open, the third expansion valve 9 is controlled to be closed, and the C end of the first four-way valve 10 is controlled to be connected with the S end of the first four-way valve 10, the E end of the first four-way valve 10 is controlled to be connected with the D end of the first four-way valve 10, the C end of the second four-way valve 11 is controlled to be connected with the D end of the second four-way valve 11, the E end of the second four-way valve 11 is connected with the S end of the second four-way valve 11, and the first end of the three-way valve 12 is controlled to be connected with the second end of the three-way valve 12, 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 1.

[0093] Specifically, if it is determined that the operating mode of the air conditioner 100 is defrosting, the second expansion valve 8 is controlled to be closed, and the C end of the first four-way valve 10 is controlled to be connected to the S end of the first four-way valve 10, the E end of the first four-way valve 10 is controlled to be connected to the D end of the first four-way valve 10, the C end of the second four-way valve 11 is controlled to be connected to the D end of the second four-way valve 11, the E end of the second four-way valve 11 is controlled to be connected to the S end of the second four-way valve 11, and the first end of the three-way valve 12 is controlled to be connected to the second end of the three-way valve 12. At this time, the refrigerant flow direction is referenced to FIG. Figure 2 As shown, that is, the refrigerant discharged from the exhaust port of the compressor 1 flows into the D end of the second four-way valve 11, and then flows into the second end of the three-way valve 12 through the C end of the second four-way valve 11, and 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 air inlet of the compressor 1;

[0094] Alternatively, the first expansion valve 7 and the second expansion valve 8 are both controlled to be open, the third expansion valve 9 is controlled to be closed, and the C end of the first four-way valve 10 is controlled to be connected to the S end of the first four-way valve 10, the E end of the first four-way valve 10 is controlled to be connected to the D end of the first four-way valve 10, the C end of the second four-way valve 11 is controlled to be connected to the D end of the second four-way valve 11, the E end of the second four-way valve 11 is controlled to be connected to the S end of the second four-way valve 11, and the first end of the three-way valve 12 is controlled to be connected to the second end of the three-way valve 12. At this time, the refrigerant flow direction is referenced to Figure 9 As shown, the refrigerant discharged from the exhaust port of compressor 1 flows into the D end of the second four-way valve 11, then flows through the C end of the second four-way valve 11 into the second end of the three-way valve 12, and then flows from the first end of the three-way valve 12 into the first heat exchanger 3, where it condenses and releases heat. Then, after passing through the first expansion valve 7 and the second expansion valve 8, it flows into the second heat exchanger 4, heating the domestic water stored in the water tank 2. It then flows into the C end of the first four-way valve 10, and flows from the S end of the first four-way valve 10 into the liquid storage tank 6, and finally returns to the compressor 1 through the air inlet of the compressor 1. Thus, the air conditioner 100 completes the defrost operation mode.

[0095] According to the configuration of the controller of the above embodiment, when the operating mode of the air conditioner 100 is the defrost mode, the effect of guiding the flow of the refrigerant is achieved 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 refrigerant enters the air inlet of the compressor 1 from the exhaust port through the first pipeline and the third pipeline in sequence; or the refrigerant enters the air inlet 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 defrost operating mode.

[0096] In some embodiments, based on the above architecture, reference Figure 10 As shown, the controller of the air conditioner is configured to perform the following steps S1 to S5.

[0097] Step S1, obtaining the heat exchange temperature of the third heat exchanger and the water tank temperature.

[0098] Specifically, temperature sensors can be installed between the second heat exchanger 4 and the water tank 2 to monitor the water tank temperature and send the acquired water tank temperature to the controller. Furthermore, the third heat exchanger can be a plate heat exchanger, and the heat exchange temperature can be determined by detecting the temperature of the water outlet of the plate heat exchanger.

[0099] Step S2: determining the heat recovery state required by the air conditioner according to the water tank temperature.

[0100] Specifically, the heat recovery of the air conditioner 100 utilizes the waste heat generated during operation of the air conditioner 100 for heating domestic water in the water tank 2 or other waste heat utilization. The heat recovery state required by the air conditioner 100 is determined based on the water tank temperature. That is, the amount of waste heat required to heat the water in the water tank is determined based on the water tank temperature. If the water tank temperature is low, more waste heat is required to heat the water in the water tank 2. The heat recovery state required by the air conditioner 100 is determined to be full heat recovery, thereby maximizing the recovery and utilization of waste heat and improving heating efficiency. If the water tank temperature is moderate, some waste heat is still required to heat the water in the water tank 2. The heat recovery state required by the air conditioner 100 is determined to be partial heat recovery, thereby providing an appropriate amount of waste heat for heating the water tank 2. This ensures heating efficiency and avoids unnecessary energy waste. Therefore, the air conditioner 100 in the present application can dynamically adjust the heat recovery state required by the air conditioner based on the water tank temperature, thereby selecting the appropriate heat recovery state based on the water tank temperature. This not only ensures that the water in the water tank 2 reaches the required temperature, but also optimizes the operating efficiency of the air conditioning system and reduces unnecessary energy consumption.

[0101] Step S3: determining the cooling state of the air conditioner according to the heat exchange temperature.

[0102] Specifically, when the third heat exchanger 5 is cooling, the refrigerant flowing therein exchanges heat with the indoor air to increase the temperature of the refrigerant. The third heat exchanger 5 uses the waste heat generated by cooling 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. Conversely, if the third heat exchanger 5 is not cooling, the outlet water temperature of the third heat exchanger 5 cannot be increased. Based on this, the cooling 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 cooling is determined by the outlet water temperature of the third heat exchanger 5. For example, if the outlet water temperature is higher than the cooling temperature threshold used to determine whether the air conditioner 100 is cooling, the cooling state of the air conditioner 100 is determined to be cooling; if the outlet water temperature is lower than the cooling temperature threshold used to determine whether the air conditioner 100 is cooling, the cooling state of the air conditioner 100 is determined to be non-cooling.

[0103] Step S4, controlling the conductance of the first four-way valve, the second four-way valve and the three-way valve according to the heat recovery state and the cooling state.

[0104] Specifically, in order to solve this problem, the present application determines the heat recovery state required by the air conditioner 100 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 cooling state of the air conditioner, the conduction conditions of the first four-way valve 10, the second four-way valve 11, and the three-way valve 12 are controlled for different heat recovery states and cooling states, thereby changing the flow path of the refrigerant in the air conditioner 100, so that the refrigerant discharged from the compressor 1 flows into the second pipeline in whole or in part, so that it can be used to heat domestic water through the second heat exchanger 4, so that the waste heat generated by the air conditioner 100 can be fully or partially recovered to heat domestic water, thereby It meets the heating demand of domestic water in the heating water tank and meets the user's cooling or non-cooling needs. Therefore, compared with the existing air conditioner using two four-way valves in series and two one-way valves, or using one four-way valve and four one-way valves to achieve full recovery of waste heat, the present application adopts the first four-way valve 10, the second four-way valve 11 and the three-way valve 12 to more accurately distribute the flow of refrigerant in the air conditioner 100, so that the air conditioner 100 can achieve both full recovery of waste heat and partial recovery of waste heat, thereby improving the comprehensive energy utilization rate of the air-conditioning system and reducing the power consumption of the air conditioner 100, thereby achieving the purpose of saving electricity bills.

[0105] For example, if it is determined that the heat recovery state required by the air conditioner 100 is full heat recovery, and the cooling state of the air conditioner 100 is non-cooling, the conduction 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 flows into the second pipeline and then flows back to the compressor 1 through the third pipeline. Alternatively, the heat recovery state required by the air conditioner 100 is full heat recovery, and the cooling state of the air conditioner 100 is cooling, at this time, the refrigerant discharged from the exhaust port of the compressor 1 is guided to flow through the second pipeline and then into the third pipeline; or, if it is determined that the heat recovery state required by the air conditioner 100 is partial heat recovery, and the cooling state of the air conditioner 100 is cooling, the refrigerant discharged from the exhaust port of the compressor 1 is guided to flow through the second pipeline and then into the third pipeline. If the cooling state is non-cooling, 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 that a part of the refrigerant discharged from the compressor 1 flows into the second pipeline, thereby causing another part of the refrigerant discharged from the compressor 1 to flow into the third pipeline; or, the heat recovery state required by the air conditioner 100 is partial heat recovery, and the cooling state of the air conditioner 100 is cooling. At this time, the refrigerant discharged from the exhaust port of the compressor 1 is guided to flow through the first pipeline, the second pipeline and then into the third pipeline, thereby realizing full heat recovery and partial heat recovery, improving the comprehensive energy utilization rate of the air-conditioning system, reducing the power consumption of the air conditioner 100, and achieving the purpose of saving electricity bills.

[0106] According to the air conditioner 100 of the embodiment of the present invention, the conduction status of the first four-way valve 10, the second four-way valve 11 and the three-way valve 12 is controlled through the heat recovery state, that is, the waste heat required to be recovered for heating the domestic water in the water tank 2, and the cooling state, so as to recover all or part of the waste heat generated by the air conditioner 100 to heat the domestic water. Therefore, 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 in this application to more accurately distribute the flow of the refrigerant in the air conditioner 100, so that the air conditioner 100 can realize both full and 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.

[0107] In some embodiments, for determining the heat recovery state required by the air conditioner 100 based on the water tank temperature, the controller is specifically configured to determine that the heat recovery state required by the air conditioner 100 is a full heat recovery state if the water tank temperature is less than a first preset temperature threshold; 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, then determine that the heat recovery state required by the air conditioner 100 is a partial heat recovery state; if the water tank temperature is greater than the second preset temperature threshold, then determine that the heat recovery state required by the air conditioner 100 is a stopped heat recovery state.

[0108] Among them, the temperature preset threshold is a preset temperature critical value used to control the heat recovery state required by the air conditioner 100. The first temperature preset threshold and the second preset temperature threshold can be set according to actual conditions, and no specific restrictions are made here. Among them, the first temperature preset threshold can be 45°C, and the second preset temperature threshold can be 55°C.

[0109] Specifically, if the water tank temperature is lower than the first preset temperature threshold, more waste heat is needed to heat the water in the water tank 2, and the heat recovery state required by the air conditioner 100 is determined to be 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, some waste heat is still needed to heat the water in the water tank 2, and the heat recovery state required by the air conditioner 100 is determined to be 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, waste heat is not needed to heat the water in the water tank 2, and the heat recovery state required by the air conditioner 100 is determined to be the stop heat recovery state.

[0110] Illustratively, 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.

[0111] Step S5, determining whether the water tank temperature is less than a first preset temperature threshold, if so, executing step S6, if not, executing step S7.

[0112] Step S6: The heat recovery state required by the air conditioner is a full heat recovery state.

[0113] Step S7, determining whether the water tank temperature is greater than a second temperature preset threshold, if so, executing step S8, if not, executing step S9.

[0114] Step S8: The heat recovery state required by the air conditioner is a partial heat recovery state.

[0115] Step S9: The heat recovery state required by the air conditioner is the heat recovery stop state.

[0116] In some embodiments, for determining the cooling state of the air conditioner 100 based on the heat exchange temperature of the third heat exchanger 5, the controller is specifically configured to determine that the cooling state is not cooling if the heat exchange temperature is less than the third preset temperature threshold; if the heat exchange temperature is greater than or equal to the third preset temperature threshold, the cooling state is determined to be cooling.

[0117] For example, to determine the cooling state of the air conditioner according to the outlet water temperature, the controller specifically processes the following steps.

[0118] Step S10, determining whether the heat exchange temperature is less than a third preset temperature threshold, if so, executing step S11; if not, executing step S12.

[0119] In step S11, the cooling state of the air conditioner is non-cooling.

[0120] Step S12: The cooling state of the air conditioner is cooling.

[0121] In some embodiments, as Figure 11 As shown, the air conditioner 100 further includes a first expansion valve 7 , a second expansion valve 8 and a third expansion valve 9 .

[0122] 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 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 and the C end of the first four-way valve 10 to be connected, the D end of the second four-way valve 11 to be connected with the E end of the second four-way valve 11, the C end of the second four-way valve 11 to be connected with the S end of the second four-way valve 11, the first end of the three-way valve 12 to be connected with the second end of the three-way valve 12, the first expansion valve 7 to be connected and in a fully open state, the second expansion valve 8 to be connected, and the third expansion valve 9 to be closed when the heat recovery state is a full heat recovery state or a partial heat recovery state and the refrigeration state is no refrigeration.

[0123] Specifically, if it is determined that the heat recovery state required by the air conditioner 100 is the full heat recovery state, and the cooling state of the air conditioner 100 is not 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 not cooling, then the D end of the first four-way valve 10 is controlled to be connected to the C end of the first four-way valve 10, the D end of the second four-way valve 11 is controlled to be connected to the E end of the second four-way valve 11, the C end of the second four-way valve 11 is controlled to be connected to the S end of the second four-way valve 11, the first end of the three-way valve 12 is controlled to be connected to the second end of the three-way valve 12, the first expansion valve 7 is turned on and is in a fully open state, the second expansion valve 8 is turned on, and the third expansion valve 9 is closed. At this time, the refrigerant flow direction is referenced Figure 6 As shown, that is, 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, the refrigerant discharged from the exhaust port of the compressor 1 all flows into the second heat exchanger 4, and the refrigerant flowing into the second heat exchanger 4 is a high-temperature refrigerant, and 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. The refrigerant after heat exchange flows into the second expansion joint through the fourth end of the second heat exchanger 4. Expansion valve 8 regulates the flow of refrigerant out of second heat exchanger 4 to lower the refrigerant's temperature. The throttled and pressure-reduced refrigerant then flows through fully-open first expansion valve 7 into first heat exchanger 3. First heat exchanger 3 exchanges heat with the outdoor air, releasing heat to the outdoor air to further lower the refrigerant's temperature. After heat exchange, the refrigerant flows through the first end of first heat exchanger 3 into the first end of three-way valve 12. After passing through the third end of three-way valve 12, it flows back to compressor 1 through the air inlet of compressor 1. Thus, air conditioner 100 fully or partially recovers waste heat when not cooling.

[0124] In some embodiments, for controlling the conduction 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 be connected with the C end of the first four-way valve 10, the E end of the first four-way valve 10 to be connected with the S end of the first four-way valve 10, the D end of the second four-way valve 11 to be connected with the C end of the second four-way valve 11, the E end of the second four-way valve 11 to be connected 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 connected, and the third expansion valve 9 to be connected, under the conditions that the heat recovery state is the full heat recovery state and the refrigeration state is the refrigeration state.

[0125] Specifically, if it is determined that the heat recovery state required by the air conditioner 100 is the full heat recovery state, and the cooling state of the air conditioner 100 is cooling, the D end of the first four-way valve 10 is controlled to be connected to the C 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 D end of the second four-way valve 11 is connected to the C 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, the three-way valve 12 is cut off, the first expansion valve 7 is closed, the second expansion valve 8 is turned on, and the third expansion valve 9 is turned on. At this time, the refrigerant flow direction is referenced Figure 12 As 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, the refrigerant discharged from the exhaust port of the compressor 1 all flows into the second heat exchanger 4, and the refrigerant flowing into the second heat exchanger 4 is a high-temperature refrigerant, and 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 a full heat recovery state, and the refrigerant after heat exchange 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 outflowing from the second heat exchanger 4 to reduce the temperature of the refrigerant. , and then the refrigerant after throttling and reducing the pressure flows into the third expansion valve 9 again. The refrigerant after throttling and reducing the pressure of the third expansion valve 9 is used to further reduce 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 and the air conditioner 100 runs the cooling mode. Then the refrigerant after heat exchange flows through the first end of the third heat exchanger 5 into the E end of the second four-way valve 11, and then flows back to the compressor 1 through the S end of the second four-way valve 11 through the air inlet of the compressor 1. Thus, the air conditioner 100 realizes the full recovery of waste heat under the condition of cooling.

[0126] In some embodiments, for controlling the conduction 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 be connected with the C end of the first four-way valve 10, the E end of the first four-way valve 10 to be connected with the S end of the first four-way valve 10, the D end of the second four-way valve 11 to be connected with the C end of the second four-way valve 11, the E end of the second four-way valve 11 to be connected with the S end of the second four-way valve 11, the first end of the three-way valve 12 to be connected with the second end of the three-way valve 12, the first expansion valve 7 to be connected and in a fully open state, the second expansion valve 8 to be connected, and the third expansion valve 9 to be connected.

[0127] Specifically, if it is determined that the heat recovery state required by the air conditioner 100 is a partial heat recovery state, and the cooling state of the air conditioner 100 is cooling, the D end of the first four-way valve 10 is controlled to be connected to the C 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 D end of the second four-way valve 11 is connected to the C 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, the first end of the three-way valve 12 is connected to the second end of the three-way valve 12, the first expansion valve 7 is turned on and is in a fully open state, the second expansion valve 8 is turned on, and the third expansion valve 9 is turned on. At this time, the refrigerant flow direction is referenced Figure 13 As shown, that is, 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, and 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 performs heat exchange 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 first expansion valve 7 in the fully open state, and the refrigerant after throttling and pressure reduction by the third expansion valve 19 to further reduce 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 a high-temperature refrigerant, which is heated by the high-temperature refrigerant and 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 outflowing from the second heat exchanger 4 to reduce the temperature of the refrigerant. The refrigerant after throttling and reducing the pressure flows into the third expansion valve 9. The refrigerant after throttling and reducing the pressure flows into the third expansion valve 9 to further reduce the temperature of the refrigerant. The refrigerant 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 cooling mode. 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 into the S end of the second four-way valve 11 through the air inlet of the compressor 1 and flows back to the compressor 1. In this way, the air conditioner 100 realizes partial recovery of waste heat when cooling.

[0128] In some embodiments, the conduction 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 S end of the first four-way valve 10 to be connected with the D end of the first four-way valve 10, the D end of the second four-way valve 11 to be connected with the C end of the second four-way valve 11, the E end of the second four-way valve 11 to be connected with the S end of the second four-way valve 11, the first end of the three-way valve 12 to be connected with the second end of the three-way valve 12, the first expansion valve 7 to be connected and in a fully open state, the second expansion valve 8 to be closed, and the third expansion valve 9 to be connected under the conditions that the heat recovery state is the stop heat recovery state and the refrigeration state is the refrigeration state.

[0129] Specifically, if it is determined that the heat recovery state required by the air conditioner 100 is the stop heat recovery state, and the cooling state of the air conditioner 100 is cooling, the S end of the first four-way valve 10 is controlled to be connected to the D end of the first four-way valve 10, the D end of the second four-way valve 11 is connected to the C 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, the first end of the three-way valve 12 is connected to the second end of the three-way valve 12, the first expansion valve 7 is turned on and is in a fully open state, the second expansion valve 8 is closed, and the third expansion valve 9 is turned on. At this time, the refrigerant flow direction is referenced Figure 14 As shown, that is, 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, 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 first expansion valve 7 in the fully open state. The refrigerant after throttling and depressurization through 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 runs the cooling 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 into the S end of the second four-way valve 11 through the air inlet of the compressor 1 and flows back to the compressor 1. As a result, the air conditioner 100 achieves cooling without recovering waste heat.

[0130] In some embodiments, when controlling the opening of the second expansion valve 8, the controller is further configured to obtain the discharge superheat of the compressor 1 and the pipeline refrigerant pressure; and control the opening of the second expansion valve 8 based on the discharge superheat and / or pipeline refrigerant pressure. That is, when the heat recovery state is full or partial and the cooling state is non-cooling, or when the heat recovery state is partial and the cooling state is cooling, when controlling the opening of the second expansion valve, the opening of the second expansion valve is controlled based on the discharge superheat and / or pipeline refrigerant pressure.

[0131] Specifically, when the refrigerant flow rate in the air conditioner 100 is too large, the refrigerant stays in the compressor 1 for a relatively short time, and the refrigerant cannot fully exchange heat with the compressor 1, resulting in insufficient exhaust superheat of the compressor 1. When the refrigerant flow rate in the air conditioner 100 is too small, the refrigerant stays in the compressor 1 for a relatively long time, and the refrigerant cannot fully exchange heat with the compressor 1, resulting in excessive exhaust superheat of the compressor 1. In addition, the saturation temperature of the pipeline refrigerant pressure is the temperature at which the refrigerant is in a saturated state (i.e., part of the liquid and part of the vapor exist at the same time) under a certain refrigerant pressure. The saturation temperature of the pipeline refrigerant pressure can only heat the domestic water in the water tank when it is greater than the water temperature in the water tank. Therefore, the opening of the second expansion valve 8 is controlled according to the exhaust superheat and / or the pipeline refrigerant pressure. For example, the opening of the second expansion valve 8 is controlled according to the pipeline refrigerant pressure. If the water temperature in the water tank is T1, the saturation temperature of the pipeline refrigerant pressure is controlled by the opening of the second expansion valve 10. The temperature is between T1+1 and T1+3°C. If the saturation temperature of the pipeline refrigerant pressure is lower than T1, the opening of the second expansion valve 8 is lowered 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 pipeline refrigerant pressure of the compressor 1; if the saturation temperature of the pipeline refrigerant pressure is greater than T1+3°C, the opening 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 pipeline refrigerant pressure of the compressor 1. Alternatively, the opening of the second expansion valve 8 is controlled according to the exhaust superheat, wherein the exhaust superheat refers to the difference between the exhaust temperature and the saturation temperature corresponding to the exhaust pressure, and the exhaust superheat should be within a preset superheat range, wherein the preset superheat range can be 15°C-20°C. If the exhaust superheat is lower than the lower limit of the preset superheat range, it means that the refrigerant flow is too large, then the opening of the second expansion valve 8 is lowered to reduce the refrigerant flow, so that the refrigerant can fully exchange heat with the compressor 1, thereby increasing the exhaust superheat of the compressor 1 and avoiding the problem of the exhaust superheat of the compressor 1 being too low. If the exhaust superheat is higher than the upper limit of the preset superheat range, then it means that the refrigerant flow is too small, then the opening of the second expansion valve 8 is increased to increase the refrigerant flow. At this time, the refrigerant cannot fully exchange heat with the compressor 1, thereby reducing the exhaust superheat of the compressor 1 and avoiding the problem of the exhaust superheat of the compressor 1 being too high.

[0132] For example, for controlling the opening of the second expansion valve 10 according to the exhaust gas superheat and / or the pipeline refrigerant pressure, the specific process of the controller includes the following steps.

[0133] Step S13, obtaining the exhaust superheat of the compressor and the pipeline refrigerant pressure.

[0134] Step S14: controlling the opening of the second expansion valve according to the exhaust gas superheat and / or the pipeline refrigerant pressure.

[0135] In some embodiments, when controlling the opening of the third expansion valve 9, the controller is further configured to obtain the compressor's discharge superheat and the pipeline refrigerant pressure; and control the opening of the third expansion valve 9 based on the discharge superheat and the pipeline refrigerant pressure. That is, when the heat recovery state is full and the cooling state is cooling, when the heat recovery state is partial and the cooling state is cooling, or when the heat recovery state is stopped and the cooling state is cooling, the opening of the third expansion valve 9 is controlled based on the discharge superheat and the pipeline refrigerant pressure.

[0136] Specifically, when the refrigerant flow rate in the air conditioner 100 is too large, the refrigerant stays in the compressor 1 for a relatively short time, and the refrigerant cannot fully exchange heat with the compressor 1, resulting in insufficient exhaust superheat of the compressor 1. When the refrigerant flow rate in the air conditioner 100 is too small, the refrigerant stays in the compressor 1 for a relatively long time, and the refrigerant cannot fully exchange heat with the compressor 1, resulting in excessive exhaust superheat of the compressor 1. In addition, the saturation temperature of the pipeline refrigerant pressure is the temperature when the refrigerant is in a saturated state (i.e., part of the liquid and part of the vapor exist at the same time) under a certain refrigerant pressure. The saturation temperature of the pipeline refrigerant pressure can only heat the domestic water in the water tank when it is greater than the water temperature in the water tank. Therefore, the opening of the third expansion valve 9 is controlled according to the exhaust superheat and / or the pipeline refrigerant pressure. For example, the opening of the third expansion valve 9 is controlled according to the pipeline refrigerant pressure. If the water temperature in the water tank is T1, the saturation temperature of the pipeline refrigerant pressure is controlled by the opening of the third expansion valve 9. The temperature is between T1+1 and T1+3°C. If the saturation temperature of the pipeline refrigerant pressure is lower than T1, the opening of the third expansion valve 9 is lowered 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 pipeline refrigerant pressure of the compressor 1; if the saturation temperature of the pipeline refrigerant pressure is greater than T1+3°C, the opening 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 pipeline refrigerant pressure of the compressor 1. Alternatively, the opening of the third expansion valve 9 is controlled according to the exhaust superheat, wherein the exhaust superheat refers to the difference between the exhaust temperature and the saturation temperature corresponding to the exhaust pressure, and the exhaust superheat should be within a preset superheat range, wherein the preset superheat range can be 15°C-20°C. If the exhaust superheat is lower than the lower limit of the preset superheat range, it means that the refrigerant flow is too large, then the opening of the third expansion valve 9 is lowered to reduce the refrigerant flow, so that the refrigerant can fully exchange heat with the compressor 1, thereby increasing the exhaust superheat of the compressor 1 and avoiding the problem of the exhaust superheat of the compressor 1 being too low. If the exhaust superheat is higher than the upper limit of the preset superheat range, then it means that the refrigerant flow is too small, then the opening of the third expansion valve 9 is increased to increase the refrigerant flow. At this time, the refrigerant cannot fully exchange heat with the compressor 1, thereby reducing the exhaust superheat of the compressor 1 and avoiding the problem of the exhaust superheat of the compressor 1 being too high.

[0137] Wherein, for controlling the opening of the third expansion valve 12 according to the exhaust gas superheat and / or the pipeline refrigerant pressure, the specific process of the controller includes the following steps.

[0138] Step S15: Obtain the compressor exhaust superheat and pipeline refrigerant pressure

[0139] Step S16: Control the opening of the third expansion valve according to the exhaust gas superheat and the pipeline refrigerant pressure.

[0140] In some embodiments, the controller is further configured to control the air conditioner 100 to stop running when the water tank temperature is greater than a second preset temperature threshold and the heat exchange temperature is less than a third preset temperature threshold.

[0141] Specifically, when the water tank temperature is greater than the second preset temperature threshold, the domestic water temperature in the water tank 2 has reached the user's demand. If heat recovery is continued to heat the domestic water in the water tank, energy waste will be caused. It may also cause safety hazards due to the excessively high water tank temperature. When the heat exchange temperature of the third heat exchanger 5 is less than the third preset temperature threshold, the indoor temperature is very low at this time, and the air conditioner 100 does not need to continue cooling, and the air conditioner 100 is controlled to stop running. Thus, when the domestic water temperature is high and the indoor temperature is low, the air conditioner 100 is controlled to stop running, thereby avoiding energy waste.

[0142] Reference below Figure 15 The control process of the air conditioner 100 according to the embodiment of the present invention is described with an example, and the specific steps are as follows.

[0143] Step S17, start.

[0144] In step S18, the user inputs an operating mode of the air conditioner, wherein the operating mode is cooling mode.

[0145] Among them, users can input the operating mode of the air conditioner through language, gestures and other operations through a remote control, an air conditioning application in a mobile terminal or a control panel on the air conditioner body.

[0146] In step S19, the air conditioner enters cooling mode.

[0147] Step S20: The refrigeration circulating water pump runs for 2 minutes.

[0148] In step S21 , the controller determines whether the heat exchange temperature is less than a third preset temperature threshold. If so, step S39 is executed; if not, step S22 is executed.

[0149] In step S22, the controller determines whether the water tank temperature is less than a first preset temperature threshold. If so, step S23 is executed; if not, step S48 is executed.

[0150] In step S23, if the heat recovery state required by the air conditioner is the full heat recovery state and the cooling state is cooling, the third heat exchanger acts as an evaporator, and the refrigerant flowing in the third heat exchanger exchanges heat with the indoor air to absorb indoor heat to reduce the indoor temperature, thereby achieving cooling of the air conditioner.

[0151] Step S24, controlling the third end of the three-way valve to communicate with the S end of the second four-way valve.

[0152] Step S25, controlling the D end of the first four-way valve to communicate with the C end of the first four-way valve, controlling the D end of the second four-way valve to communicate with the C end of the second four-way valve, and controlling the E end of the second four-way valve to communicate with the S end of the second four-way valve.

[0153] Step S26: Control the second expansion valve to be in a fully open state.

[0154] Step S27, controlling the first expansion valve to close.

[0155] Step S28: controlling the opening of the third expansion valve according to the exhaust gas superheat and / or the pipeline refrigerant pressure.

[0156] In step S29, the user sets a second preset temperature threshold, wherein the second preset temperature threshold may be 55°C.

[0157] Step S30, determining whether the water tank temperature is greater than a second preset temperature threshold, if so, executing step S32, if not, executing step S31.

[0158] Step S31, determining whether the water tank temperature is greater than or equal to a first preset temperature threshold and less than or equal to a second preset temperature threshold, if so, executing step S48, if not, executing step S21.

[0159] In step S32, if the heat recovery state required by the air conditioner is the stop heat recovery state and the cooling state is cooling.

[0160] Step S33, determining whether the heat exchange temperature is less than a third preset temperature threshold, if so, executing step S55, if not, executing step S34.

[0161] Step S34, controlling the second expansion valve to close.

[0162] Step S35: Control the first expansion valve to be in a fully open state.

[0163] Step S36: controlling the opening of the second expansion valve according to the exhaust gas superheat and / or the pipeline refrigerant pressure.

[0164] Step S37, controlling the second end of the three-way valve to communicate with the C end of the second four-way valve.

[0165] Step S38: Control the operating state of the fan according to the refrigerant pressure in the pipeline, and execute step S21.

[0166] Step S39, determining whether the water tank temperature is less than a first preset temperature threshold, if so, executing step S40, if not, executing step S22.

[0167] In step S40, if the heat recovery state required by the air conditioner is the full heat recovery state and the cooling state is cooling, the first heat exchanger acts 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 refrigerant temperature.

[0168] Step S41, controlling the third end of the three-way valve to communicate with the S end of the second four-way valve.

[0169] Step S42, controlling the D end of the first four-way valve to communicate with the C end of the first four-way valve, controlling the D end of the second four-way valve to communicate with the C end of the second four-way valve, and controlling the E end of the second four-way valve to communicate with the S end of the second four-way valve.

[0170] Step S43: controlling the opening of the second expansion valve according to the exhaust gas superheat and / or the pipeline refrigerant pressure.

[0171] Step S44: Control the second expansion valve to be in a fully open state.

[0172] Step S45: Control the third expansion valve to close.

[0173] Step S46: The user sets a second preset temperature threshold.

[0174] Step S47, determining whether the water tank temperature is greater than a second preset temperature threshold, if so, executing step S33, if not, executing step S30.

[0175] Step S48: If the heat recovery state required by the air conditioner is the partial heat recovery state and the cooling state is cooling.

[0176] In step S49, the second end of the three-way valve is connected to the C end of the second four-way valve.

[0177] Step S50, controlling the D end of the first four-way valve to communicate with the C end of the first four-way valve, controlling the D end of the second four-way valve to communicate with the C end of the second four-way valve, and controlling the E end of the second four-way valve to communicate with the S end of the second four-way valve.

[0178] Step S51 , controlling the opening of the second expansion valve according to the exhaust gas superheat and / or the pipeline refrigerant pressure.

[0179] Step S52: Control the first expansion valve to be in a fully open state.

[0180] Step S53: controlling the opening of the third expansion valve according to the exhaust gas superheat and / or the pipeline refrigerant pressure.

[0181] In step S54, the user sets a second preset temperature and executes step S30.

[0182] Step S55: Control the air conditioner to stop running.

[0183] In some embodiments, the present application can also use seven solenoid valves connected in parallel and in series to change the flow direction of the refrigerant discharged from the exhaust port. Specifically, refer to Figure 16 As shown, the head end of the first pipeline is connected to the exhaust port through the first solenoid valve, the head end of the second pipeline is connected to the exhaust port through the second solenoid valve, the end of the first pipeline and the end of the second pipeline are both used to be connected to the head 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 air inlet, the first end of the sixth solenoid valve 18 is connected to the first solenoid valve, and the second end of the sixth solenoid valve 18 is connected to the head end of the first pipeline and the second end of the seventh solenoid valve 19; a controller 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 .

[0184] Specifically, in order to solve this problem, the present application is based on the method of connecting three expansion valves and seven solenoid valves in parallel and in series, so that when the air conditioner 100 operates in full heat recovery mode or 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. In this way, both full recovery and partial recovery of waste heat from the air conditioner can be achieved. That is to say, the conduction of each solenoid valve and each expansion valve is controlled according to the operating mode of the air conditioner 100, that is, according to the full heat recovery mode or the partial heat recovery mode, 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 are controlled. The valve 19 is opened or closed 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, thereby realizing full or partial recovery of waste heat. Therefore, compared with the existing air conditioner using two four-way valves in series and two one-way valves, or using one four-way valve and four one-way valves to realize full recovery of waste heat, the present application adopts a parallel and series connection of three expansion valves and seven solenoid valves to more accurately distribute the flow rate of the refrigerant in the air conditioner 100, so that the air conditioner 100 can realize both full and 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.

[0185] For example, if it is determined that the operating mode of the air conditioner 100 is the full heat recovery mode, 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 are controlled to be turned on or off so that the high-temperature gaseous refrigerant discharged from the compressor 1 all flows into the second heat exchanger 4, and 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, and then the refrigerant after heat exchange with the second heat exchanger 4 passes through the third heat exchanger 5 and then flows back to the compressor 1. Alternatively, if it is determined that the operating mode of the air conditioner 100 is the partial heat recovery mode, 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 are controlled to be turned on or off The 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 are turned on or off so that part of the high-temperature gaseous refrigerant discharged from the compressor 1 flows into the second heat exchanger, and 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, another part of the high-temperature gaseous refrigerant discharged from the compressor 1 flows into the first heat exchanger 3 for heat exchange, and then the refrigerant after heat exchange with the second heat exchanger 4 and the first exchanger flows back to the compressor 1 through the third heat exchanger 5, thereby realizing full heat recovery and partial heat recovery, improving the comprehensive energy utilization rate of the air-conditioning system, and reducing the power consumption of the air conditioner 100, thereby achieving the purpose of saving electricity bills.

[0186] According to the air conditioner of 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 flow direction of the refrigerant. Therefore, when the compressor discharges the refrigerant, the refrigerant is no longer simply passed through the water tank first, but the conduction status of each solenoid valve and each expansion 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 realizing that the air conditioner has multiple different operating modes while avoiding the problem of insufficient or excessive cooling or heating capacity caused by the refrigerant heating the water tank first.

[0187] In addition, based on the parallel and series connection of three expansion valves and seven solenoid valves, when the air conditioner 100 operates in full heat recovery mode or partial heat recovery mode, the flow and direction of the refrigerant are changed by controlling the conduction of each expansion valve and each solenoid valve, thereby achieving full or partial recovery of waste heat. Therefore, compared with the existing air conditioner using two four-way valves in series and two one-way valves, or using one four-way valve and four one-way valves to achieve full recovery of waste heat, the present application adopts a parallel and series connection of three expansion valves and seven solenoid valves to more accurately distribute the flow of refrigerant in the air conditioner 100, so that the air conditioner 100 can achieve both full and partial recovery of waste heat, thereby improving the comprehensive energy utilization rate of the air-conditioning system and reducing the power consumption of the air conditioner 100, thereby achieving the purpose of saving electricity bills.

[0188] 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 as follows: when the operating mode is a full heat recovery mode of simultaneous cooling and hot water production, the second solenoid valve and the fourth solenoid valve are both controlled to be open, and the first solenoid valve, the third solenoid valve, the fifth solenoid valve 17, the sixth solenoid valve 18 and the seventh solenoid valve 19 are all controlled to be closed, and the first expansion valve 7 is controlled to be closed, the second expansion valve 8 is controlled to be connected, and the third expansion valve 9 is controlled to be connected.

[0189] Specifically, if the air conditioner 100 operates in the full heat recovery mode of cooling and hot water at the same time, the second solenoid valve and the fourth solenoid valve are controlled to be open, and the first solenoid valve, the third solenoid valve, the fifth solenoid valve 17, the sixth solenoid valve 18 and the seventh solenoid valve 19 are controlled to be closed, and the first expansion valve 7 is controlled to be closed, the second expansion valve 8 is controlled to be turned on, and the third expansion valve 9 is controlled to be turned on. At this time, the refrigerant flow direction is as follows: Figure 17As shown, the second heat exchanger uses all the high-temperature gaseous refrigerant discharged from 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 reduce the indoor temperature, thereby realizing the full heat recovery mode of the air conditioner 100 for simultaneous cooling and hot water production. That is, the high-temperature gaseous refrigerant discharged from the compressor 1 flows into the second heat exchanger 4 through the second solenoid valve under the action of the second solenoid valve being opened and the first solenoid valve being closed. 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 for heating. In the water full heat recovery mode, the refrigerant after heat exchange is throttled and reduced in pressure to a low-temperature refrigerant by the second expansion valve 8 and the third expansion valve 9 under the conduction of the second expansion valve 8 and the third expansion valve 9, 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 indoor heat to reduce the indoor temperature. Thus, the air conditioner 100 operates in the cooling mode. Then, the refrigerant after heat exchange is closed 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 action of the opening of the fourth solenoid valve, it flows into the air inlet of the compressor 1 through the fourth solenoid valve. Thus, the air conditioner 100 realizes full recovery of waste heat under the condition of cooling.

[0190] 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 as follows: when the operating mode is a simultaneous cooling and hot water partial heat recovery mode, the first solenoid valve, the second solenoid valve, the fourth solenoid valve and the sixth solenoid valve 18 are all controlled to be open, and the third solenoid valve, the fifth solenoid valve 17 and the seventh solenoid valve 19 are all controlled to be closed, and the first expansion valve 7, the second expansion valve 8 and the third expansion valve 9 are all controlled to be conductive.

[0191] Specifically, the air conditioner 100 operates in a cooling and hot water partial heat recovery mode at the same time, and the controller controls the first solenoid valve, the second solenoid valve, the fourth solenoid valve and the sixth solenoid valve 18 to be open, and controls the third solenoid valve, the fifth solenoid valve 17 and the seventh solenoid valve 19 to be closed, and controls the first expansion valve 7, the second expansion valve 8 and the third expansion valve 9 to be turned on. At this time, the refrigerant flow direction is as follows: Figure 18As shown, that is, part of the high-temperature gaseous refrigerant discharged by the compressor 1 flows into the second heat exchanger 4 through the second solenoid valve under the action of the first solenoid valve and the second solenoid valve being opened, and 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 partial heat recovery mode for hot water production, and the refrigerant after heat exchange with the second heat exchanger 4 is throttled and reduced in pressure to a low-temperature refrigerant by the second expansion valve 8 in the second pipeline 7. 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 first solenoid valve and the sixth solenoid valve 18 being opened. The first heat exchanger is located outdoors, and the first heat exchanger 3 exchanges part of the refrigerant with the outdoor air. Heat exchange is performed, that is, the refrigerant releases heat to the outdoor air to exchange heat with the circulating refrigerant. The refrigerant after heat exchange with the first heat exchanger 3 is throttled and reduced in pressure to a low-temperature refrigerant through the first expansion valve 7 of the first pipeline 6 under the action of the conduction of the first expansion valve 7. The low-temperature refrigerant gathered at the ends of the first pipeline 6 and the second pipeline 7 is throttled and reduced in pressure through the third expansion valve 9. The low-temperature refrigerant after further cooling 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 reduce the indoor temperature. Thus, the air conditioner 100 operates in the cooling mode. Then, the refrigerant after heat exchange flows into the air inlet of the compressor 1 through the fourth solenoid valve under the action of the third solenoid valve and the seventh solenoid valve 19 being closed and the fourth solenoid valve being opened. Thus, the air conditioner 100 realizes partial recovery of waste heat under the condition of cooling.

[0192] In some embodiments, the controller is further configured to: when the outdoor ambient temperature is within the normal operating range of the compressor 1, the heat exchange temperature of the third heat exchanger is greater than the first preset temperature, and the shutdown time of the compressor 1 reaches the preset time, control the compressor 1 to start so that the air conditioner 100 operates in the cooling mode; when the outdoor ambient temperature is within the normal operating range of the compressor 1, the domestic water temperature is lower than the second preset temperature, and the shutdown time of the compressor 1 reaches the preset time, control the compressor 1 to start so that the air conditioner 100 operates in the hot water making mode, wherein the hot water making mode includes the hot water making full heat recovery mode and the hot water making partial heat recovery mode; when the outdoor ambient temperature is within the normal operating range of the compressor 1, the heat exchange temperature of the third heat exchanger is greater than the first preset temperature, the domestic water temperature is lower than the second preset temperature, and the shutdown time of the compressor 1 reaches the preset time, control the compressor 1 to start so that the air conditioner 100 operates in the simultaneous cooling and hot water making modes.

[0193] The first preset temperature can be understood as a pre-set temperature value used to determine whether the indoor environment requires the air conditioner 100 to operate in cooling mode for adjustment. The first preset temperature can be 5°C. The preset duration can be understood as a threshold for determining the duration of time when the compressor 1 is not started. The preset duration can be 3 minutes. The second preset temperature can be understood as a pre-set temperature value used to determine 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.

[0194] Specifically, since the operation of compressor 1 at extreme outdoor ambient temperature may affect the life of compressor 1 and increase the risk of compressor 1 failure, when the outdoor ambient temperature is within the normal operating range of compressor 1, compressor 1 can start and operate normally and maintain an efficient working state; when the indoor ambient temperature is high, the heat exchange temperature of the indoor environment and the third heat exchanger will be high; since the air conditioner 100 may be started when the shutdown time of compressor 1 does not reach the preset time, the compressor 1 may be briefly shut down due to special circumstances. Based on this, when the outdoor ambient temperature is within the normal operating range of the compressor 1, it means that the compressor 1 can start and operate normally and maintain an efficient working state, and the heat exchange temperature of the third heat exchanger is greater than the first preset temperature, which means that the indoor ambient temperature is high. At this time, the air conditioner 100 needs to run the cooling mode, and when the shutdown time of the compressor 1 reaches the preset time, it means that the compressor 1 is not started and the air conditioner 100 is in an inoperative state, then the compressor 1 is controlled to start so that the air conditioner 100 runs in the cooling mode. Therefore, in this application, whether the air conditioner 100 runs in the cooling mode is determined by 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 time of the compressor 1 meet the requirements to ensure that the compressor 1 can start normally and effectively improve the service life and working efficiency of the compressor 1.

[0195] When the outdoor ambient temperature is within the normal operating range of the compressor 1, it means that the compressor 1 can start and operate normally and maintain an efficient working state, and the domestic water temperature is lower than the second preset temperature, which means that the domestic water temperature is low. At this time, the air conditioner 100 needs to run the hot water making mode, and when the shutdown time of the compressor 1 reaches the preset time, it means that the compressor 1 is not started and the air conditioner 100 is in an inoperative state. The compressor 1 is controlled to start so that the air conditioner 100 runs the hot water making mode, wherein the hot water making mode includes the hot water making full heat recovery mode and the hot water making partial heat recovery mode. Therefore, in this application, whether the air conditioner 100 runs the hot water making mode is determined by the domestic water temperature, and at the same time, it is determined that the outdoor ambient temperature and the shutdown time of the compressor 1 meet the requirements to ensure that the compressor 1 can start normally and effectively improve the service life and working efficiency of the compressor 1.

[0196] When the outdoor ambient temperature is within the normal operating range of the compressor 1, it means that the compressor 1 can start and operate normally and maintain an efficient working state, and the heat exchange temperature of the third heat exchanger is greater than the first preset temperature, which means that the indoor ambient temperature is high. At this time, the air conditioner needs to run in the cooling mode, and the domestic water temperature is lower than the second preset temperature, which means that the domestic water temperature is low. At this time, the air conditioner 100 needs to run in the hot water mode, and when the shutdown time of the compressor 1 reaches the preset time, it means that the compressor 1 has not started and the air conditioner 100 is in an inoperative state. The compressor 1 is controlled to start so that the air conditioner 100 runs in the cooling and hot water modes at the same time. Therefore, in this application, the air conditioner 100 is determined to run in the cooling and hot water modes at the same time by 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 time of the compressor 1 meet the requirements to ensure that the compressor 1 can start normally and effectively improve the service life and working efficiency of the compressor 1.

[0197] 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.

[0198] In some embodiments, after controlling the compressor 1 to start, the controller is further configured to perform steps S1 to S2:

[0199] Step S1, determining a first temperature difference between a domestic water temperature and a target water temperature, and determining a second temperature difference between a heat exchange temperature of a third heat exchanger and a target heat exchange temperature.

[0200] Step S2: controlling the variation range of the operating frequency of the compressor 1 according to the first temperature difference and the second temperature difference.

[0201] In the embodiment, the compressor 1 is started with an initial frequency f, which is generally between 25 and 40 Hz. After the compressor 1 is started, it runs at the initial frequency f for 3 minutes. After 3 minutes, the change amplitude of the operating frequency of the compressor 1 is controlled according to the first temperature difference and the second temperature difference.

[0202] Among them, the target water temperature is the domestic water temperature set by the user according to demand

[0203] Specifically, if the first temperature difference between the domestic water temperature and the target water temperature is less than 0, it means that the domestic water temperature has not reached the domestic water temperature set by the user according to demand, and it is necessary to control the compressor 1 to operate at a higher frequency to increase the refrigerant flow rate flowing into the second heat exchanger 4, so that the refrigerant can exchange heat with the domestic water more efficiently, thereby quickly raising the domestic water temperature. Moreover, the lower the first temperature difference, the higher the variation range of the operating frequency of the compressor 1. Moreover, if the second temperature difference between the heat exchange temperature of the third heat exchanger and the target heat exchange temperature is smaller, the greater the cooling demand is, the higher the variation range of the operating frequency of the compressor 1 is. Based on this, in order to take into account both cooling and hot water production needs when controlling the operating frequency of the compressor 1, this application uses the first temperature difference and the second temperature difference to control the operating frequency of the compressor 1. The temperature difference controls the amplitude of the change in the operating frequency of compressor 1. That is, the cooling demand and the hot water demand are determined by the first temperature difference and the second temperature difference, and then the amplitude of the change in the operating frequency of compressor 1 corresponding to the cooling demand and the hot water demand is selected, and then the operating frequency of compressor 1 is controlled according to the amplitude of the change. For example, when the first temperature difference and the second temperature difference are both large, it means that the air conditioner 100 needs to heat domestic water quickly and needs efficient cooling, so the amplitude of the change in the operating frequency of compressor 1 is controlled to be high to meet the cooling demand and the hot water demand at the same time; when the first temperature difference and the second temperature difference are both small, the amplitude of the change in the operating frequency of compressor 1 is controlled to be low to meet the cooling demand and the hot water demand at the same time, avoiding energy waste caused by excessive adjustment. Therefore, in this application, the amplitude of the change in the operating frequency of compressor 1 is dynamically adjusted according to the cooling demand and the hot water demand, so that the cooling and hot water demand of the air conditioner can be taken into account, thereby improving the overall efficiency of the system and user experience.

[0204] In an embodiment, the correspondence between the first temperature difference and the second temperature difference and the preset variation range of the operating frequency of the compressor 1 can be preset in the controller, thereby obtaining the corresponding preset variation range through the first temperature difference and the second temperature difference.

[0205] Depend on Figure 19It can be seen that the amplitude of change in the operating frequency of compressor 1 when ΔT1 ≤ -8 is higher than that when -1 < ΔT1 < 0, and the amplitude of change in the operating frequency of compressor 1 when ΔT2 ≥ 8 is higher than that when -1 ≤ ΔT2 < -0.5. When ΔT1 ≥ 0, it indicates that the domestic water temperature has reached the domestic water temperature set by the user, and there is no need to increase the operating frequency of compressor 1 to heat the domestic water. In this case, the amplitude of change in the operating frequency of compressor 1 is controlled only based on the second temperature difference. When ΔT2 < -2, there is no cooling demand, and there is no need to increase the operating frequency of compressor 1 to increase the cooling capacity. In this case, the amplitude of change in the operating frequency of compressor 1 is controlled only based on the first temperature difference. When the first temperature difference ΔT1 is the same, the larger the second temperature difference ΔT2, the greater the amplitude of change in the operating frequency of compressor 1. When the second temperature difference ΔT2 is the same, the larger the first temperature difference ΔT1, the greater the amplitude of change in the operating frequency of compressor 1.

[0206] For example, the query is performed by the first temperature difference ΔT1 and the second temperature difference ΔT2. Figure 19 , to obtain the variation range of the operating frequency of compressor 1. If the first temperature difference ΔT1≤-8 and the second temperature difference ΔT2≥8, the variation range of the operating frequency of compressor 1 is +8.

[0207] In some embodiments, when controlling the first expansion valve 7 in the partial heat recovery mode for hot water production, the controller is further configured to perform steps S3 to S5:

[0208] Step S3: determining a third temperature difference between the coil temperature of the first heat exchanger and the outdoor ambient temperature.

[0209] Step S4: determining a first opening increment of the first expansion valve 7 according to the third temperature difference.

[0210] Step S5: adjusting the opening of the first expansion valve 7 according to the first opening increment.

[0211] Specifically, the third temperature difference between the coil temperature of the first heat exchanger 3 and the outdoor ambient temperature is used to judge the superheat at the outlet of the first heat exchanger 3. When the third temperature difference is lower than the lower limit of the temperature difference range corresponding to the superheat setting requirement, the superheat at the outlet of the first heat exchanger 3 is insufficient. In other words, at this time, the refrigerant flow in the first heat exchanger 3 is too large, the refrigerant stays in the first heat exchanger 3 for a relatively short time, and the refrigerant cannot fully exchange heat with the first heat exchanger 3. At this time, the opening 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 so that the superheat at the outlet of the first heat exchanger 3 meets the requirement. When the third temperature difference is higher than the upper limit 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. In other words, at this time, the refrigerant flow in the first heat exchanger 3 is too small, the refrigerant stays in the first heat exchanger 3 for a relatively long time, and the refrigerant can fully exchange heat with the first heat exchanger 3. A heat exchanger 3 performs heat exchange, and at this time, the opening of the first expansion valve 7 needs to be increased to increase the refrigerant flow rate. Based on this, in order to ensure that the first heat exchanger 3 can operate efficiently and stably, in this application, when controlling the first expansion valve 7 in the partial heat recovery mode of hot water production, the first opening increment of the first expansion valve 7 is determined according to the third temperature difference, so that the outlet superheat of the first heat exchanger 3 is changed by the first opening increment, so that the outlet superheat of the first heat exchanger 3 meets the set requirements. That is, when the third temperature difference is lower than the set requirement, the first opening increment is controlled to be negative, and the higher the third temperature difference, the larger the first opening increment, so as to increase the superheat of the outlet of the first heat exchanger 3 by the size of the third temperature difference, so that the superheat of the outlet of the first heat exchanger 3 meets the requirements. When the third temperature difference is higher than the set requirement, the first opening increment is controlled to be positive, and the superheat of the outlet of the first heat exchanger 3 is reduced, so that the superheat of the outlet of the first heat exchanger 3 meets the requirements.

[0212] Exemplarily, when the domestic water temperature is greater than the second preset temperature, the opening 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 increment of the first expansion valve 7 is determined according to the third temperature difference, and the third temperature difference is expressed as Tg-Th. When Tg-Th satisfies 10℃≤Tg-Th<15℃, the superheat of the first heat exchanger 3 meets the set requirements. If Tg-Th≤5℃, the first opening increment ΔD is -5, if 5℃<Tg-Th<10℃, the first opening increment ΔD1 is -2, if 10℃≤Tg-Th<15℃, the first opening increment ΔD1 is 0, if Tg-Th≥15℃, the first opening increment ΔD1 is +2. In addition, it should be noted that the opening of the first expansion valve 7 needs to be adjusted every 40s.

[0213] In addition, it should be noted that when the temperature of domestic water is lower than the second preset temperature, the opening degree of the first expansion valve 7 is maintained at 0 steps.

[0214] 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:

[0215] Step S6: obtaining the condensation temperature of the refrigerant and determining a fourth temperature difference between the condensation temperature and the domestic water temperature.

[0216] Step S7: determining a second opening increment of the second expansion valve 8 according to the domestic water temperature and the fourth temperature difference.

[0217] Step S8: adjusting the opening of the second expansion valve 8 according to the second opening increment.

[0218] 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 of the second expansion valve 8 is reduced, and the smaller the opening increment of the second expansion valve 8 is, the refrigerant flow rate discharged from the second heat exchanger 4 is reduced, so that the refrigerant can fully exchange heat with the domestic water to enhance the temperature increase effect of the domestic water. If the opening of the second expansion valve 8 is reduced, and the opening increment of the second expansion valve 8 is larger, the refrigerant flow rate discharged from the second heat exchanger 4 is increased to slow down the temperature increase effect of the domestic water; and the fourth temperature difference between the condensing temperature and the domestic water temperature is used to judge the second heat exchanger 4 Superheat, when the fourth temperature difference is lower than the lower limit of the temperature difference range corresponding to the superheat setting requirement, the superheat of the outlet of the second heat exchanger 4 is insufficient, that is, at this time the refrigerant flow in the second heat exchanger 4 is too large, the refrigerant stays in the second heat exchanger 4 for a relatively short time, and the refrigerant cannot fully exchange heat with the second heat exchanger 4. At this time, it is necessary to reduce the opening of the second expansion valve 8 to reduce the refrigerant flow so that the refrigerant can fully exchange heat with the second heat exchanger 4 and increase the superheat of the outlet of the second heat exchanger 4 so that the superheat of the outlet of the second heat exchanger 4 meets the requirement. When the fourth temperature difference is higher than the upper limit of the temperature difference range corresponding to the superheat setting requirement The superheat at the outlet of the second heat exchanger 4 is too high when the temperature reaches the limit value, that is, the refrigerant flow rate in the second heat exchanger 4 is too small at this time. The refrigerant stays in the second heat exchanger 4 for a relatively long time, and the refrigerant fully exchanges heat with the second heat exchanger 4. At this time, the opening of the second expansion valve 8 needs to be increased to increase the refrigerant flow rate. Based on this, in order to achieve precise control of the superheat of the second heat exchanger 4 and achieve the purpose of heating domestic water, the second opening increment of the second expansion valve 8 is determined according to the domestic water temperature and the fourth temperature difference, thereby changing the outlet superheat of the second heat exchanger 4 through the second opening increment, so that the outlet superheat of the second heat exchanger 4 is reduced. The temperature meets the set requirements, and at the same time, the domestic water heating effect is changed by the second opening 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 increment is controlled to be negative, and the higher the fourth temperature difference, the larger the second opening increment is, so as to increase the superheat at the outlet of the second heat exchanger 4 by the size of the fourth temperature difference, so that the superheat at the outlet of the second heat exchanger 4 meets the requirements. When the fourth temperature difference is higher than the set requirement, the second opening increment is controlled to be positive, reducing the superheat at the outlet of the second heat exchanger 4, so that the superheat at the outlet of the second heat exchanger 4 meets the requirements. At the same time, if it is determined that the domestic water temperature is smaller, the second opening increment is negative, and the smaller the second opening increment is, the better the domestic water temperature heating effect is. Therefore, in this application, the second opening 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 of the second heat exchanger 4 and achieve the purpose of heating the domestic water.

[0219] In an embodiment, the correspondence between the domestic water temperature and the fourth temperature difference and the second opening increment of the second expansion valve 8 can be preset in the controller, thereby obtaining the corresponding second opening increment through the domestic water temperature and the fourth temperature difference.

[0220] Depend on Figure 20 It can be seen that the second opening increment ΔD2 of Tn-Tx≤0 is lower than the second opening increment ΔD2 of 0<Tn-Tx>5. When Tn-Tx satisfies 10℃≤Tn-Tx<15℃, the superheat of the second heat exchanger 4 meets the set requirements. Under the same Tn-Tx, the second opening increment ΔD2 of Tx<45℃ is lower than the second opening increment ΔD2 of 53≤Tx, that is, under the same Tn-Tx, the larger Tx is, the larger the second opening increment ΔD2 is.

[0221] For example, the fourth temperature difference can be expressed as condensation temperature Tn-domestic water temperature Tx, and the domestic water temperature Tx and Tn-Tx can be used to query Figure 20 The second opening increment ΔD2 is obtained from the table. For example, if Tn-Tx≤0, 45≤Tx<50°C, the second opening increment ΔD2 is -4.

[0222] In some embodiments, when controlling the third expansion valve 9 in the simultaneous cooling and 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 a fifth temperature difference between the inlet water temperature and the liquid pipe temperature; determine a 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 based on the third opening increment. The refrigerant temperature in the refrigerant-side connecting pipe of the plate heat exchanger is determined.

[0223] Specifically, the exhaust temperature of compressor 1 indicates the low pressure of the refrigeration system. When the low pressure is too high or too low, the refrigeration system becomes more unstable. At this time, it is necessary to adjust the low pressure by changing the opening of the third expansion valve 9 and changing the refrigerant flow rate. And the superheat of the third heat exchanger is judged by the fifth temperature difference between the water inlet temperature and the liquid pipe temperature. When the fifth temperature difference is lower than the lower limit of the temperature difference range corresponding to the superheat setting requirement, the superheat of the outlet of the third heat exchanger is insufficient. That is to say, at this time, the refrigerant flow in the third heat exchanger is too large and the refrigerant stays in the third heat exchanger for a relatively short time, and the refrigerant cannot fully exchange heat with the third heat exchanger. At this time, the opening of the third expansion valve 9 needs to be reduced to reduce the refrigerant flow so that the refrigerant can fully exchange heat with the third heat exchanger and increase the superheat of the outlet of the third heat exchanger so that the superheat of the outlet of the third heat exchanger meets the requirements. Based on this, in order to achieve precise control of the superheat of the third heat exchanger and balance the low pressure of the refrigeration system, the third opening increment of the third expansion valve 9 is determined according to the exhaust temperature and the fifth temperature difference in this application. The outlet superheat of the third heat exchanger is changed by the third opening increment so that the outlet superheat of the third heat exchanger meets the set requirements. That is to say, when the fifth temperature difference is lower than the set requirements, the second opening increment is controlled to be negative, and the higher the fifth temperature difference is, the larger the third opening increment is, so as to increase the superheat of the outlet of the third heat exchanger by the size of the fifth temperature difference, so that the superheat of the outlet of the third heat exchanger meets the requirements. When the fifth temperature difference is lower than the lower limit of the temperature difference range corresponding to the superheat setting requirement, the third opening increment is controlled to be negative, and the higher the fifth temperature difference is, the larger the third opening increment is, so as to increase the superheat of the outlet of the third heat exchanger by the size of the fifth temperature difference, so that the superheat of the outlet of the third heat exchanger meets the requirements. At the same time, the low pressure of the refrigeration system is changed by the third opening increment to balance the low pressure of the refrigeration system.

[0224] In an embodiment, a correspondence between the exhaust temperature and the fifth temperature difference and the third opening increment of the third expansion valve 9 may be preset in the controller, whereby the corresponding third opening increment may be obtained through the exhaust temperature and the fifth temperature difference.

[0225] For example, Figure 21 It can be seen from the table that when Tj-Ty satisfies Tj-Ty≥2, the superheat of the third heat exchanger meets the set requirements, and the third opening increment of 0<Tj-Ty<2 is greater than the third opening increment of Tj-Ty≤0, that is, the larger the Tj-Ty, the higher the third opening increment; when Tj-Ty is the same, the third opening increment of Tp<90℃ is smaller than the third opening increment of 90≤Tp<95℃, which is smaller than the third opening increment of 95≤Tp, that is, when Tj-Ty is the same, the larger the Tp, the higher the third opening increment.

[0226] For example, the fifth temperature difference can be expressed as Tj-Ty, which can be obtained by querying 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.

[0227] 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, the Figure 22 Controlled by the rules of the table.

[0228] 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.

[0229] The initial steps of the expansion valve are shown in the following table:

[0230]

[0231] 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 condensing 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.

[0232] Specifically, in order to accurately control the speed of the outdoor fan, the present application controls the speed of the outdoor fan by the sixth temperature difference between the condensation temperature of the refrigerant and the coil temperature of the first heat exchanger 3, that is, the indoor ventilation requirements are determined by the sixth temperature difference, and the speed of the outdoor fan is adjusted according to the indoor ventilation requirements, thereby accurately controlling the speed of the outdoor fan, effectively solving the indoor ventilation problem, and improving the indoor air quality.

[0233] 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.

[0234] Specifically, if the sixth temperature difference is higher than the first temperature difference threshold, indicating that less fresh air is needed indoors, the outdoor fan speed is controlled to decrease; if the sixth temperature difference is lower than the second temperature difference threshold, indicating that more fresh air is needed indoors, the outdoor fan speed is controlled to increase. Thus, in this application, the outdoor fan speed is controlled by the sixth temperature difference between the refrigerant condensing temperature and the coil temperature of the first heat exchanger 3, thereby precisely controlling the outdoor fan speed, effectively solving indoor ventilation problems, and improving indoor air quality.

[0235] For example, in the partial heat recovery mode for hot water production, the sixth temperature difference Tn-Tg is controlled to satisfy 3°C≤Tn-Tg≤5°C. If Tn-Tg>5°C, the speed of the outdoor fan is controlled to decrease; if Tn-Tg<3°C, the speed of the outdoor fan is controlled to increase.

[0236] In an embodiment, Figure 16 As shown, the air conditioner 100 includes a first water pump 20 and a second water pump 21, which provide power for the flow of water 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, thereby lowering or raising the temperature of the user's room.

[0237] In this embodiment, in the hot water mode, the coil temperature Tg of the first heat exchanger 3 is controlled to satisfy 5 ≤ Tg ≤ 12°C. If Tg is greater than 12°C, the speed of the outdoor fan is controlled to decrease; if Tg is less than 5°C, the speed of the outdoor fan is controlled to increase. Alternatively, in the cooling mode, the coil temperature of the first heat exchanger 3 is controlled to satisfy 35 ≤ Tg ≤ 45°C. If Tg is less than 35°C, the speed of the outdoor fan is controlled to decrease; if Tg is greater than 45°C, the speed of the outdoor fan is controlled to increase.

[0238] In this embodiment, the first water pump is controlled as follows: After the air conditioner 100 is turned on, the first water pump starts at maximum speed and detects the status of the water flow switch. If the water flow switch is detected to be off for 15 consecutive seconds, it indicates that the water flow is too low and the first water pump stops. Furthermore, when the domestic water temperature Tx minus the second preset temperature is ≥ 0°C, the first water pump is shut down after a delay of 1 minute. The first water pump's speed is controlled to maintain the outlet and inlet water temperatures of the second heat exchanger 4 within the range of 4°C ≤ outlet water temperature - inlet water temperature ≤ 6°C. If the outlet water temperature - inlet water temperature is less than 4°C, the first water pump's speed is reduced, and its duty cycle is reduced by 10% per minute, adjusting once per minute. If the outlet water temperature - inlet water temperature is greater than 6°C, the first water pump's speed is increased, and its duty cycle is increased by 10% per minute, adjusting once per minute.

[0239] In this embodiment, the second water pump is controlled as follows: After the air conditioner 100 is turned on, the second water pump starts at maximum speed and detects the status of the water flow switch. If the water flow switch is off for 15 consecutive seconds, it indicates that the water flow rate is too low, and the second water pump stops. When the heat exchange temperature of the third heat exchanger minus the first preset temperature exceeds 5°C, the second water pump is restarted.

[0240] Shutdown: When the heat exchange temperature of the third heat exchanger minus the first preset temperature is ≤ -2°C, the second water pump operates with a 2-minute on, 2-minute off cycle. After the air conditioner 100 is completely shut down, the second water pump is turned off for a 2-minute delay. When controlling the speed of the second water pump, the second water pump operates to maintain the outlet and inlet water temperatures of the second heat exchanger 4 within the range of 4°C ≤ inlet water temperature - outlet water temperature ≤ 6°C. If the inlet water temperature - outlet water temperature is less than 4°C, the speed of the second water pump is reduced, and the duty cycle is reduced by 10% per minute, adjusting once per minute. If the inlet water temperature - outlet water temperature is greater than 6°C, the speed of the second water pump is increased, and the duty cycle is increased by 10% per minute, adjusting once per minute.

[0241] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0242] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that 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 for storing domestic water; a first heat exchanger, located outdoors and configured to exchange heat with the circulating refrigerant; a second heat exchanger connected to the water tank and used for exchanging heat for the domestic water; A 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 end of the first pipeline and the end end of the second pipeline are both used to connect to the head end of the third pipeline, and the end 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 being disposed 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, the control valve being 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 further comprises: 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 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 being used to adjust a flow rate of 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, and 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 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 and an 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, 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 the end of the third pipeline, and an S end of the second four-way valve is connected to the 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 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 cooling mode, the first expansion valve and the third expansion valve are controlled to be open, 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 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 heating mode, the first expansion valve and the third expansion valve are controlled to be open, 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 and the first pipeline in sequence and then enter 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 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 cooling and hot water mode, the first expansion valve, the second expansion valve and the third expansion valve are all controlled to be open, 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 into 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 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 cooling and hot water mode, the second expansion valve and the third expansion valve are controlled to be open, 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 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 cooling and hot water mode, the first expansion valve, the second expansion valve and the third expansion valve are all controlled to be open, 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 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 making mode, the first expansion valve and the second expansion valve are 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 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 and the first pipeline in sequence and then enter 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 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 mode, the first expansion valve, the second expansion valve and the third expansion valve are all controlled to be open, 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 S end of the second four-way valve, the E end of the second four-way valve is connected to the D end of the second four-way valve, and the first end of the three-way valve is connected to 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, wherein: Regarding controlling the conductance 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 defrost mode, the first expansion valve and the third expansion valve are both controlled to be open, 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 from the exhaust port through the first pipeline and the third pipeline in sequence and then enter the air inlet of the compressor; 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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