Multi-split heat recovery multi-split air conditioning system

Abstract

The invention relates to the technical field of household appliances, in particular to a multi-split heat recovery multi-split air conditioning system which comprises an air conditioning system, a hot water system, an adjusting unit and a controller, the air conditioning system, the hot water system and the adjusting unit are connected with one another, the controller responds to a first control instruction and controls the multi-split heat recovery multi-split air conditioning system to operate in a defrosting mode, and the controller controls the multi-split heat recovery multi-split air conditioning system to operate in the defrosting mode. A water tank heat exchanger in the hot water system is used as an evaporator by controlling the state of each component in the adjusting unit, a refrigerant in a water tank branch is heated through water in a water tank, and the heated refrigerant exchanges heat with an outdoor heat exchanger after flowing through a compressor so as to defrost the outdoor heat exchanger. Therefore, heat in the water tank is transferred to the outdoor heat exchanger, the defrosting speed is effectively increased, the influence on the indoor temperature is remarkably reduced, efficient operation and stability of the air conditioning system in a low-temperature environment are ensured, the overall operation performance is improved, and the negative influence of temperature fluctuation on the comfort degree of a user in the defrosting process is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to a one-to-many heat recovery multi-split air-conditioning system. Background Art

[0002] Multi-split central air conditioning is a type of user central air conditioning, commonly known as "one to many", which refers to a primary refrigerant air conditioning system in which one outdoor unit is connected to two or more indoor units through piping, with air-cooled heat exchange on the outdoor side and direct evaporation heat exchange on the indoor side.

[0003] Defrosting during heating operation in multi-split central air conditioners has always been a significant factor affecting their performance and user experience. When the ambient temperature is low, frost easily forms on the outdoor heat exchanger, reducing heat exchange efficiency, leading to reduced system performance and even equipment interruption. Currently, a range of defrosting technologies exist, including reverse cycle defrosting, hot gas bypass defrosting, and thermal storage defrosting. However, these defrosting methods all suffer from long defrosting times, high energy consumption, and a significant reduction in user comfort. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0005] To this end, the purpose of the present invention is to propose a one-to-many heat recovery multi-split air-conditioning system, which transfers the heat in the water tank to the outdoor heat exchanger, which not only effectively speeds up the defrosting speed, but also significantly reduces the impact on the indoor temperature, ensuring the efficient operation and stability of the air-conditioning system in a low-temperature environment, thereby improving the overall operating performance and avoiding the negative impact of temperature fluctuations during the defrosting process on user comfort.

[0006] An embodiment of the present invention provides a one-to-many heat recovery multi-split air-conditioning system, the one-to-many heat recovery multi-split air-conditioning system comprising: an air-conditioning system, the air-conditioning system comprising: a refrigerant circulation loop, wherein the refrigerant circulates in a loop consisting of a compressor, an outdoor heat exchanger, an outdoor expansion valve, an expansion valve group, an indoor heat exchanger group, and a first four-way valve, wherein the indoor heat exchanger group comprises a plurality of indoor heat exchangers connected in parallel; a first interface of the first four-way valve is connected to the outlet of the compressor, a second interface of the first four-way valve is connected to the outdoor heat exchanger, a third interface of the first four-way valve is connected to the indoor heat exchanger group, and a fourth interface of the first four-way valve is connected to the inlet of the compressor; The expansion valve group includes: a plurality of first expansion valves connected in parallel, one end of each of the first expansion valves is connected to one end of the outdoor expansion valve, and the other end of each of the first expansion valves is connected to one end of the corresponding indoor heat exchanger; a hot water system is connected to the air conditioning system, and the hot water system includes: a water tank; a water tank heat exchanger is arranged in the water tank; a water tank branch, the water tank heat exchanger is connected to the refrigerant circulation loop through the water tank branch, and the water tank branch includes: a first water tank branch and a second water tank branch; wherein, one end of the first water tank branch is connected to the outlet of the compressor, the other end of the first water tank branch is connected to one end of the water tank heat exchanger, and the second One end of the water tank branch is connected to the other end of the water tank heat exchanger, and the other end of the second water tank branch is connected to one end of the expansion valve group; when the water tank heat exchanger is used as an evaporator, the refrigerant in the water tank branch can be heated by the water in the water tank, and the heated refrigerant flows through the compressor and exchanges heat with the outdoor heat exchanger to defrost the outdoor heat exchanger; a regulating unit is respectively connected to the refrigerant circulation loop and the water tank branch, and the regulating unit is used to adjust the on-off state between the refrigerant circulation loop and the water tank branch, and to adjust the on-off state between the outdoor heat exchanger and the indoor heat exchanger group in the refrigerant circulation loop; a controller is respectively The controller is connected to the air-conditioning system and the regulating unit, and is configured to: in response to a first control instruction, control the one-to-many heat recovery multi-split air-conditioning system to operate in a defrost mode, and in the defrost mode, control the status of each component in the regulating unit, thereby controlling the disconnection between the refrigerant circulation loop and the water tank branch, and controlling the disconnection between the outdoor heat exchanger and the indoor heat exchanger group in the refrigerant circulation loop, so that the water tank heat exchanger is used as an evaporator, and the refrigerant in the water tank branch is heated by the water in the water tank. The heated refrigerant flows through the compressor and exchanges heat with the outdoor heat exchanger to defrost the outdoor heat exchanger.

[0007] The above technical solution has the following advantages or beneficial effects: According to an embodiment of the present invention, a one-to-many heat recovery multi-split air-conditioning system provided includes an interconnected air-conditioning system, a hot water system and a regulating unit, and a controller. The water tank heat exchanger in the hot water system can be used as an evaporator. The controller responds to a first control instruction to control the one-to-many heat recovery multi-split air-conditioning system to operate in a defrost mode. In the defrost mode, the controller controls the state of each component in the regulating unit to control the disconnection between the refrigerant circulation loop and the water tank branch, and controls the disconnection between the outdoor heat exchanger and the indoor heat exchanger group in the refrigerant circulation loop, so that the water tank heat exchanger in the hot water system is used as an evaporator. The refrigerant in the water tank branch is heated by the water in the water tank. The heated refrigerant flows through the compressor and then exchanges heat with the outdoor heat exchanger to defrost the outdoor heat exchanger, thereby transferring the heat in the water tank to the outdoor heat exchanger, which not only effectively speeds up the defrosting speed, but also significantly reduces the impact on the indoor temperature, ensuring the efficient operation and stability of the air-conditioning system in a low-temperature environment, thereby improving the overall operating performance and avoiding the negative impact of temperature fluctuations during the defrosting process on user comfort.

[0008] In addition, the one-to-many heat recovery multi-split air conditioning system according to the embodiment of the present invention may also have the following additional technical features:

[0009] Furthermore, the regulating unit includes: a first switch component, including: a gas shut-off valve, one end of the gas shut-off valve is connected to the outlet of the compressor, the other end of the gas shut-off valve is connected to the first interface, and the gas shut-off valve is used to control the on-off state between the outlet of the compressor and the refrigerant circulation loop; a second switch component is arranged on the first water tank branch, one end of the second switch component is connected to the outlet of the compressor, the other end of the second switch component is connected to one end of the water tank heat exchanger, and the second switch component is used to control the on-off state between the first water tank branch and the refrigerant circulation loop; a first throttling control component, one end of the first throttling control component is connected to the refrigerant circulation loop, the other end of the first throttling control component is connected to the inlet of the compressor and the fourth interface, and the first throttling control component Used to make the refrigerant in the outdoor heat exchanger and / or indoor heat exchanger group flow back or not flow back to the compressor through its own on-off state; a flow regulating component is arranged on the second water tank path, one end of the flow regulating component is connected to the other end of the water tank heat exchanger, and the other end of the flow regulating component is connected to one end of the expansion valve group and one end of the outdoor expansion valve, and the flow regulating component is used to regulate the refrigerant flow out of the water tank heat exchanger; a third switch component includes: a liquid stop valve, one end of the liquid stop valve is connected to one end of the outdoor expansion valve, and the other end of the liquid stop valve is connected to one end of the expansion valve group and one end of the flow regulating component, and the liquid stop valve is used to control the on-off state between the indoor heat exchanger group and the outdoor heat exchanger, as well as to control the on-off state between the second water tank branch and the outdoor heat exchanger.

[0010] Furthermore, the regulating unit also includes: a second throttling control component, one end of the second throttling control component is connected to the first water tank branch, the other end of the second throttling control component is connected to the inlet of the compressor and the fourth interface, and the second throttling control component is used to make the refrigerant in the water tank branch return or not return to the compressor through its own on-off state.

[0011] The above technical solution has the following advantages or beneficial effects: According to the one-to-many heat recovery multi-split air-conditioning system provided by the embodiment of the present invention, through the cooperation of the first switch component, the second switch component, the first throttling control component, the flow regulating component, the third switch component and the second throttling control component, the regulating unit can adjust the on-off state between the refrigerant circulation loop and the water tank branch, and adjust the on-off state between the outdoor heat exchanger and the indoor heat exchanger group in the refrigerant circulation loop, thereby facilitating the control of the one-to-many heat recovery multi-split air-conditioning system.

[0012] Furthermore, the second switch assembly includes: a second four-way valve arranged on the first water tank branch, wherein the fifth interface of the second four-way valve is connected to the outlet of the compressor, the sixth interface of the second four-way valve is closed, the seventh interface of the second four-way valve is connected to one end of the water tank heat exchanger, and the eighth interface of the second four-way valve is connected to the inlet of the compressor.

[0013] The above technical solution has the following advantages or beneficial effects: According to the one-to-many heat recovery multi-split air-conditioning system provided by an embodiment of the present invention, the second switch assembly includes a second four-way valve. By switching the connection status of different interfaces of the second four-way valve, the on-off status between the first water tank branch and the refrigerant circulation loop can be controlled.

[0014] Furthermore, the second switch assembly also includes: a first solenoid valve arranged on the first water tank branch, wherein one end of the first solenoid valve is connected to the outlet of the compressor, and the other end of the first solenoid valve is connected to the fifth interface of the second four-way valve.

[0015] The above technical solution has the following advantages or beneficial effects: According to the one-to-many heat recovery multi-split air-conditioning system provided by an embodiment of the present invention, the second switch assembly may also include a first solenoid valve. By controlling the opening and closing state of the first solenoid valve, the on-off state between the first water tank branch and the refrigerant circulation loop can be controlled.

[0016] Furthermore, the first throttling control component includes: a first capillary and a second solenoid valve connected in series, wherein one end of the first capillary is connected to the other end of the gas shut-off valve and the first interface, the other end of the first capillary is connected to one end of the second solenoid valve, and the other end of the second solenoid valve is connected to the inlet of the compressor and the fourth interface.

[0017] The above technical solution has the following advantages or beneficial effects: According to the one-to-many heat recovery multi-split air-conditioning system provided in an embodiment of the present invention, the first throttling control component includes a first capillary tube and a second solenoid valve, through which the refrigerant in the outdoor heat exchanger and / or the indoor heat exchanger group can be refluxed or not refluxed to the compressor.

[0018] Furthermore, the flow regulating component includes: a second expansion valve arranged on the second water tank branch, wherein one end of the second expansion valve is connected to the other end of the water tank heat exchanger, and the other end of the second expansion valve is connected to one end of the expansion valve group and one end of the outdoor expansion valve.

[0019] The above technical solution has the following advantages or beneficial effects: According to the one-to-many heat recovery multi-split air-conditioning system provided by an embodiment of the present invention, the flow regulating component includes a second expansion valve, through which the refrigerant flow out of the water tank heat exchanger can be adjusted.

[0020] Furthermore, the second throttling control component includes: a second capillary tube and a third solenoid valve connected in series, wherein one end of the second capillary tube is connected to the first water tank branch, the other end of the second capillary tube is connected to one end of the third solenoid valve, and the other end of the third solenoid valve is connected to the inlet of the compressor and the fourth interface.

[0021] The above technical solution has the following advantages or beneficial effects: According to the one-to-many heat recovery multi-split air-conditioning system provided by an embodiment of the present invention, the second throttling control component includes a second capillary tube and a third solenoid valve, through which the refrigerant in the water tank branch can be refluxed or not refluxed to the compressor.

[0022] Furthermore, in response to the first control instruction, when controlling the one-to-many heat recovery multi-split air-conditioning system to operate in the defrost mode, the controller is configured to: when the regulating unit does not include the second throttling control component and the second switch component does not include the first solenoid valve, control the first interface and the second interface of the first four-way valve to be connected, and control the third interface and the fourth interface of the first four-way valve to be connected; control the outdoor expansion valve to be fully open; control multiple first expansion valves to be closed; control the gas stop valve to be fully open; control the liquid stop valve to be fully open; control the second expansion valve to be open; control the second solenoid valve to be closed; and control the fifth interface and the sixth interface of the second four-way valve to be connected, and control the first interface and the sixth interface of the second four-way valve to be connected. The seventh interface and the eighth interface are connected; or, when the regulating unit includes the second throttling control component and the second switch component includes the first solenoid valve, the first interface and the second interface of the first four-way valve are controlled to be connected, and the third interface and the fourth interface of the first four-way valve are controlled to be connected; the outdoor expansion valve is controlled to be fully open; multiple first expansion valves are controlled to be closed; the gas stop valve is controlled to be fully open; the liquid stop valve is controlled to be fully open; the second expansion valve is controlled to be opened; the second solenoid valve is controlled to be closed; the fifth interface and the sixth interface of the second four-way valve are controlled to be connected, and the seventh interface and the eighth interface of the second four-way valve are controlled to be connected, and the first solenoid valve is controlled to be closed, and the third solenoid valve is controlled to be closed.

[0023] The above technical solution has the following advantages or beneficial effects: according to the one-to-many heat recovery multi-split air-conditioning system provided by the embodiment of the present invention, when responding to the first control instruction and controlling the one-to-many heat recovery multi-split air-conditioning system to operate in defrost mode, the controller controls the corresponding valve to open so that the refrigerant flows through the outdoor heat exchanger and the water tank heat exchanger in sequence, and the water tank heat exchanger is used as an evaporator. The refrigerant in the water tank branch is heated by the water in the water tank, and the heated refrigerant flows through the compressor and exchanges heat with the outdoor heat exchanger to defrost the outdoor heat exchanger, thereby transferring the heat in the water tank to the outdoor heat exchanger, which not only effectively speeds up the defrosting speed, but also significantly reduces the impact on the indoor temperature, ensuring the efficient operation and stability of the air-conditioning system in a low temperature environment, thereby improving the overall operating performance and avoiding the negative impact of temperature fluctuations during the defrosting process on user comfort.

[0024] Furthermore, the one-to-many heat recovery multi-split air-conditioning system also includes a subcooling device, wherein the subcooling device is connected to the second water tank branch, one end of the subcooling device is connected to the other end of the water tank heat exchanger, and the other end of the subcooling device is connected to one end of the expansion valve group and one end of the outdoor expansion valve, and the subcooling device is used to exchange heat with the refrigerant in the second water tank branch to heat the water entering the water tank; or, the subcooling device is connected to the refrigerant circulation loop, one end of the subcooling device is connected to one end of the expansion valve group and the other end of the water tank heat exchanger, and the other end of the subcooling device is connected to one end of the outdoor expansion valve, and the subcooling device is used to exchange heat with the refrigerant in the refrigerant circulation loop to heat the water entering the water tank.

[0025] The above technical solution has the following advantages or beneficial effects: According to the one-to-many heat recovery multi-split air-conditioning system provided by an embodiment of the present invention, a supercooling device is also provided on the second water tank branch or the refrigerant circulation loop. The supercooling device is used to perform heat exchange with the refrigerant in the second water tank branch or the refrigerant circulation loop to heat the water entering the water tank, thereby helping to improve the heat exchange efficiency and optimize the system operation performance.

[0026] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments with reference to the following drawings, in which:

[0028] Figure 1 2. It is a structural diagram of a one-to-many heat recovery multi-split air conditioning system according to an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the specific structure of a one-to-many heat recovery multi-split air conditioning system according to an embodiment of the present invention;

[0030] Figure 3 2 is a schematic diagram of the specific structure of a one-to-many heat recovery multi-split air conditioning system according to another embodiment of the present invention;

[0031] Figure 4 is a schematic structural diagram of a hot water system according to an embodiment of the present invention;

[0032] Figure 5 is a schematic diagram of the hardware structure of a controller according to a specific embodiment of the present invention;

[0033] Figure 6 is a structural diagram of an air conditioning system according to a specific embodiment of the present invention;

[0034] Figure 7 is a structural diagram of a refrigeration system of an air-conditioning system according to a specific embodiment of the present invention;

[0035] Figure 8 is a schematic structural diagram of an adjustment unit according to an embodiment of the present invention;

[0036] Figure 9 is a schematic diagram of refrigerant flow in a cooling mode according to an embodiment of the present invention;

[0037] Figure 10 is a schematic diagram of refrigerant flow in a cooling mode according to another embodiment of the present invention;

[0038] Figure 11 is a schematic diagram of refrigerant flow in a heating mode according to an embodiment of the present invention;

[0039] Figure 12 is a schematic diagram of refrigerant flow in a heating mode according to another embodiment of the present invention;

[0040] Figure 13 is a schematic diagram of refrigerant flow in a water tank heating mode according to an embodiment of the present invention;

[0041] Figure 14 is a schematic diagram of refrigerant flow in a water tank separate heating mode according to another embodiment of the present invention;

[0042] Figure 15 is a schematic diagram of refrigerant flow in a first cooling and water tank heating mode according to an embodiment of the present invention;

[0043] Figure 16 is a schematic diagram of refrigerant flow in a first cooling and water tank heating mode according to another embodiment of the present invention;

[0044] Figure 17 is a schematic diagram of refrigerant flow in a second cooling and water tank heating mode according to an embodiment of the present invention;

[0045] Figure 18 is a schematic diagram of refrigerant flow in a second cooling and water tank heating mode according to another embodiment of the present invention;

[0046] Figure 19 is a schematic diagram of refrigerant flow in heating and water tank heating modes according to one embodiment of the present invention;

[0047] Figure 20 is a schematic diagram of refrigerant flow in heating and water tank heating modes according to another embodiment of the present invention;

[0048] Figure 21 is a schematic diagram of refrigerant flow in a defrost mode according to an embodiment of the present invention;

[0049] Figure 22 is a schematic diagram of refrigerant flow in a defrost mode according to another embodiment of the present invention;

[0050] Figure 23 is a first installation schematic diagram of a supercooling device according to one embodiment of the present invention;

[0051] Figure 24 is a second installation schematic diagram of a supercooling device according to one embodiment of the present invention;

[0052] Figure 25 is a first installation schematic diagram of a supercooling device according to another embodiment of the present invention;

[0053] Figure 26 is a second installation schematic diagram of a supercooling device according to another embodiment of the present invention;

[0054] Figure 27 1 is a schematic structural diagram of a hot water system according to a specific embodiment of the present invention. DETAILED DESCRIPTION

[0055] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0056] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0057] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0058] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0059] Reference below Figure 1-Figure 27 A one-to-many heat recovery multi-split air conditioning system according to an embodiment of the present invention is described.

[0060] Figure 1 Schematic diagram of a one-to-many heat recovery multi-split air conditioning system according to an embodiment of the present invention. Figure 1 As shown, an embodiment of the present invention provides a one-to-many heat recovery multi-split air conditioning system 100, including: an air conditioning system 110, a hot water system 120, a regulating unit 130 and a controller 71.

[0061] Figure 2 This is a schematic diagram of the specific structure of a one-to-many heat recovery multi-split air conditioning system according to an embodiment of the present invention. Figure 3 FIG. 1 is a schematic diagram of the specific structure of a one-to-many heat recovery multi-split air conditioning system according to another embodiment of the present invention. Figure 2 and Figure 3 As shown, in one embodiment of the present invention, the air-conditioning system 110 includes: a refrigerant circulation loop, so that the refrigerant circulates in a loop composed of a compressor 1, an outdoor heat exchanger 2, an outdoor expansion valve 3, an expansion valve group, an indoor heat exchanger group, a stop valve group, and a first four-way valve 4, wherein the indoor heat exchanger group includes a plurality of indoor heat exchangers 5 connected in parallel.

[0062] In a specific embodiment, the air conditioning system 110 is a one-to-many air conditioning system. The air conditioning system 110 includes a refrigerant circulation loop. The refrigerant circulation loop circulates the refrigerant in a loop consisting of a compressor 1, an outdoor heat exchanger 2, an outdoor expansion valve 3, an expansion valve group, an indoor heat exchanger group, a stop valve group, and a first four-way valve 4. The indoor heat exchanger group includes a plurality of indoor heat exchangers 5 connected in parallel. The number of indoor heat exchanger groups corresponds to the number of expansion valve groups, indoor heat exchanger groups, and stop valve groups. For example, Figure 2 The middle indoor heat exchanger group includes three indoor heat exchangers connected in parallel.

[0063] Figure 4 FIG. 1 is a schematic diagram of a hot water system according to an embodiment of the present invention. Figure 2-Figure 4 As shown, in one embodiment of the present invention, the hot water system 120 is connected to the air-conditioning system 110, and the hot water system 120 includes: a water tank 20; a water tank heat exchanger 21, which is arranged in the water tank 20; a water tank branch, the water tank heat exchanger 21 is connected to the refrigerant circulation loop through the water tank branch, and the water tank branch includes: a first water tank branch and a second water tank branch; wherein, one end of the first water tank branch is connected to the outlet of the compressor 1, the other end of the first water tank branch is connected to one end of the water tank heat exchanger 21, one end of the second water tank branch is connected to the other end of the water tank heat exchanger 21, and the other end of the second water tank branch is connected to one end of the expansion valve group and one end of the outdoor expansion valve 3; when the water tank heat exchanger 21 is used as an evaporator, the refrigerant in the water tank branch can be heated by the water in the water tank 20, and the heated refrigerant flows through the compressor 1 and performs heat exchange with the outdoor heat exchanger 2 to defrost the outdoor heat exchanger 2.

[0064] In a specific embodiment, the hot water system 120 includes a water tank 20 and a water tank heat exchanger 21 arranged on the water tank 20. The water tank heat exchanger 21 is, for example, wrapped around the water tank 20. The water tank heat exchanger 21 is connected to the refrigerant circulation loop through a water tank branch. The water tank branch includes a first water tank branch and a second water tank branch. The two ends of the first water tank branch are respectively connected to the outlet of the compressor 1 and the inlet of the water tank heat exchanger 21. The two ends of the second water tank branch are respectively connected to the outlet of the water tank heat exchanger 21 and the expansion valve group and the outdoor expansion valve 3.

[0065] In a specific embodiment, the water tank heat exchanger 21 can be used as an evaporator, and the refrigerant in the water tank branch is heated by the water in the water tank 20. The heated refrigerant flows through the compressor 1 and exchanges heat with the outdoor heat exchanger 2 to defrost the outdoor heat exchanger 2.

[0066] In one embodiment of the present invention, the regulating unit 130 is connected to the refrigerant circulation loop and the water tank branch, respectively. The regulating unit 130 is used to adjust the on-off state between the refrigerant circulation loop and the water tank branch, and to adjust the on-off state between the outdoor heat exchanger 2 and the indoor heat exchanger group in the refrigerant circulation loop.

[0067] In a specific embodiment, the regulating unit 130 includes, for example, multiple solenoid valves, and the regulating unit 130 can adjust the on-off state between the refrigerant circulation loop and the water tank branch, as well as adjust the on-off state between the outdoor heat exchanger 2 and the indoor heat exchanger group in the refrigerant circulation loop.

[0068] In one embodiment of the present invention, the controller 71 is connected to the air-conditioning system 110 and the regulating unit 130, respectively. The controller 71 is configured to: respond to a first control instruction, control the one-to-many heat recovery multi-split air-conditioning system 100 to operate in the defrost mode, and in the defrost mode, control the status of each component in the regulating unit 130, thereby controlling the disconnection between the refrigerant circulation loop and the water tank branch, and controlling the disconnection between the outdoor heat exchanger 2 and the indoor heat exchanger group in the refrigerant circulation loop, so that the water tank heat exchanger 21 is used as an evaporator, and the refrigerant in the water tank branch is heated by the water in the water tank 20. The heated refrigerant flows through the compressor 1 and performs heat exchange with the outdoor heat exchanger 2 to defrost the outdoor heat exchanger 2.

[0069] In a specific embodiment, the operator can send a first control instruction through the terminal to enable the controller 71 to control the one-to-many heat recovery multi-split air-conditioning system 100 to operate in the defrost mode. In the defrost mode, the controller 71 controls the status of each component in the regulating unit 130, thereby controlling the disconnection between the refrigerant circulation loop and the water tank branch, and controlling the disconnection between the outdoor heat exchanger 2 and the indoor heat exchanger group in the refrigerant circulation loop, so that the water tank heat exchanger 21 is used as an evaporator, and the refrigerant in the water tank branch is heated by the water in the water tank 20. The heated refrigerant flows through the compressor 1 and exchanges heat with the outdoor heat exchanger 2 to defrost the outdoor heat exchanger 2, thereby transferring the heat in the water tank to the outdoor heat exchanger 2, which not only effectively speeds up the defrost speed, but also significantly reduces the impact on the indoor temperature, ensuring the efficient operation and stability of the air-conditioning system 110 in a low temperature environment, thereby improving the overall operating performance and avoiding the negative impact of temperature fluctuations during the defrost process on user comfort.

[0070] Specifically, the one-to-many heat recovery multi-split air-conditioning system 100 provided in accordance with an embodiment of the present invention includes an interconnected air-conditioning system 110, a hot water system 120, and a regulating unit 130, as well as a controller 71. The water tank heat exchanger 21 in the hot water system 120 can be used as an evaporator. The controller 71 responds to a first control instruction to control the one-to-many heat recovery multi-split air-conditioning system 100 to operate in a defrost mode. In the defrost mode, the controller 71 controls the status of each component in the regulating unit 130 to disconnect the refrigerant circulation loop and the water tank branch, and controls the outdoor heat exchanger 2 and The indoor heat exchanger groups are disconnected so that the water tank heat exchanger 21 in the hot water system 120 is used as an evaporator. The refrigerant in the water tank branch is heated by the water in the water tank 20. The heated refrigerant flows through the compressor 1 and exchanges heat with the outdoor heat exchanger 2 to defrost the outdoor heat exchanger 2, thereby transferring the heat in the water tank to the outdoor heat exchanger 2. This not only effectively speeds up the defrosting speed, but also significantly reduces the impact on the indoor temperature, ensuring the efficient operation and stability of the air-conditioning system 110 in a low-temperature environment, thereby improving the overall operating performance and avoiding the negative impact of temperature fluctuations during the defrosting process on user comfort.

[0071] In a specific embodiment, the controller 71 is a device that can generate an operation control signal based on the instruction operation code and the timing signal to instruct the electrical device 10 to execute the first control instruction. For example, in response to receiving a power-on or power-off instruction from the user, the controller 71 can perform an operation related to the object selected by the power-on or power-off instruction.

[0072] Figure 5 FIG. 1 is a schematic diagram of the hardware structure of a controller according to a specific embodiment of the present invention. Figure 5 As shown, in a specific embodiment of the present invention, the controller 71 includes a processor 83, and optionally, a memory 82 and a communication interface 84 connected to the processor 83. The processor 83, the memory 82 and the communication interface 84 are connected via a bus 81.

[0073] The processor 83 may be a central processing unit (CPU), a general-purpose processor (GP), a network processor (NP), a digital signal processor (DSP), a microprocessor (MCU), a microcontroller (MCU), a programmable logic device (PLD), or any combination thereof. The processor 83 may also be any other device having processing functionality, such as a circuit, a device, or a software module. The processor 83 may also include multiple CPUs, and the processor 83 may be a single-core (single CPU) processor 83 or a multi-core (multi CPU) processor 83. The processor 83 herein may refer to one or more devices, circuits, or processing cores for processing data (e.g., computer program instructions).

[0074] The memory 82 can be a read-only memory 82 (ROM) or other types of static storage devices that can store static information and instructions, a random access memory 82 (RAM) or other types of dynamic storage devices that can store information and instructions, or an electrically erasable programmable read-only memory 82 (EEPROM), a compact disc read-only memory (CDROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer. The embodiment of the present invention does not impose any restrictions on this. The memory 82 can exist independently or be integrated with the processor 83. Among them, the memory 82 can contain computer program code. The processor 83 is used to execute the computer program code stored in the memory 82, thereby realizing the control method of the electrical device provided in the embodiment of the present invention.

[0075] The communication interface 84 can be used to communicate with other devices or communication networks (such as Ethernet, radio access network (RAN), wireless local area network (WLAN), etc.). The communication interface 84 can be a module, a circuit, a transceiver or any device that can achieve communication.

[0076] The bus 81 may be a peripheral component interconnect (PCI) bus 81 or an extended industry standard architecture (EISA) bus 81. The bus 81 may be divided into an address bus 81, a data bus 81, a control bus 81, etc. For ease of representation, Figure 5 Only one thick line is used in the figure, but it does not mean that there is only one bus 81 or one type of bus 81.

[0077] Figure 6 FIG. 1 is a schematic diagram of the structure of an air conditioning system according to a specific embodiment of the present invention. Figure 6 As shown, in a specific embodiment of the present invention, the air-conditioning system includes a refrigeration system for exchanging heat with indoor air to meet cooling or heating needs.

[0078] Figure 7 FIG. 1 is a schematic diagram of the structure of the refrigeration system of the air-conditioning system according to a specific embodiment of the present invention. Figure 7 As shown, in a specific embodiment of the present invention, the refrigeration system includes a compressor, a condenser, an electronic expansion valve, and an evaporator. The air conditioning system in this specific embodiment of the present invention utilizes the compressor, condenser, electronic expansion valve, and evaporator to perform a refrigeration cycle of the air conditioning system. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the conditioned and heat-exchanged air.

[0079] 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.

[0080] The electronic expansion valve expands the high-temperature, high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the refrigerant expanded in the electronic expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor.

[0081] The evaporator can achieve a cooling effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. Throughout the entire cycle, the air conditioning system can adjust the temperature of the indoor space.

[0082] The outdoor unit 2 of the air conditioning system refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit 1 of the air conditioning system includes an indoor heat exchanger, and an electronic expansion valve may be provided in the indoor unit 1 or the outdoor unit 2 .

[0083] 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 conditioning system functions as a heater in heating mode, and when the indoor heat exchanger functions as an evaporator, the air conditioning system functions as a cooler in cooling mode.

[0084] The air conditioning system in the specific embodiment of the present invention includes multiple indoor units 1 and an outdoor unit 2. The indoor units 1 and outdoor units 2 can be configured as an integrated unit or a split unit. The indoor unit 1 can be configured as a wall-mounted unit, a ceiling unit, a duct unit, etc., and the indoor unit 1 is installed at the top or ceiling of the indoor room.

[0085] Reference Figure 7 Taking an indoor hanging machine as an example, an indoor hanging machine is usually installed at a location such as an indoor wall. For another example, an indoor cabinet machine (not shown in the figure) is also a form of the indoor machine 1 .

[0086] Taking a split unit as an example, the air conditioning system includes multiple indoor units 1 and one outdoor unit 2, wherein the outdoor unit 2 is usually set outdoors for heat exchange with the indoor environment.

[0087] In addition, if Figure 7 As shown in the figure, the air conditioning system includes a controller to control the operation of various components within the air conditioning system, thereby enabling the various components to operate and achieve the system's predetermined functions. The air conditioning system also includes a control device 200. For example, the control device 200 is specifically configured as a remote control that communicates with the controller using, for example, infrared or other communication methods. The remote control allows the user to control various aspects of the air conditioning system, enabling interaction between the user and the system.

[0088] The indoor unit 1 of the air-conditioning system in the specific embodiment of the present invention is arranged at the top or upper part of the room. Generally speaking, the installation height of the indoor unit 1 is higher than the user activity area. The indoor unit 1 includes a return air inlet and an air outlet connected to the room. The indoor air passes through the indoor unit 1 in the return air inlet and flows back to the room through the air outlet.

[0089] The refrigerant circulation circuit in this embodiment of the present invention circulates refrigerant through a loop consisting of a compressor, condenser, electronic expansion valve, and evaporator. One of the condenser and evaporator functions as an outdoor heat exchanger, while the other functions as an indoor heat exchanger. The indoor heat exchanger exchanges heat with the air in indoor unit 1, while the outdoor unit 2 heat exchanger exchanges heat with the air in outdoor unit 2, thereby achieving the cooling or heating requirements of the air conditioning system.

[0090] The indoor unit 1 also includes an indoor fan, which is arranged near the return air port or the air outlet of the indoor heat exchanger and is used to deliver the heat-exchanged air into the room. The indoor fan includes multiple gears for changing the outlet air flow speed of the outlet.

[0091] An air guide plate is provided at the position of the air outlet. The air guide plate adjusts the outflow direction of the air flowing through the air outlet by changing the relative rotation angle between the air guide plate and the air outlet, thereby affecting the indoor air temperature stratification.

[0092] In the specific embodiment shown in the present invention, the air conditioning system further includes a controller, which is configured as the controller 71 described in any one of the above embodiments, for example.

[0093] like Figure 2 and Figure 3 As shown, in one embodiment of the present invention, when the water tank heat exchanger 21 is used as a condenser, the refrigerant in the refrigerant circulation loop can flow through the water tank heat exchanger 21 through the water tank branch for heat exchange, so that the water tank heat exchanger 21 heats the water in the water tank 20.

[0094] In a specific embodiment, the water tank heat exchanger 21 can be used as a condenser, and the refrigerant in the refrigerant circulation loop flows through the water tank heat exchanger 21 through the water tank branch for heat exchange, so that the water tank heat exchanger 21 heats the water in the water tank 20.

[0095] In one embodiment of the present invention, the controller 71 is also configured to: respond to a second control instruction, control the one-to-many heat recovery multi-split air-conditioning system 100 to operate in different working modes, and in different working modes, control the status of each component in the adjustment unit 130, thereby adjusting the on-off state between the refrigerant circulation loop and the water tank branch, and adjusting the on-off state between the outdoor heat exchanger 2 and the indoor heat exchanger group in the refrigerant circulation loop, so that the refrigerant that does not participate in heat exchange in the refrigerant circulation loop and / or the water tank branch flows back to the compressor 1 based on the pressure difference between the flow path and the inlet of the compressor 1; wherein the second control instruction includes the first control instruction.

[0096] In a specific embodiment, the operator can send a second control instruction through the terminal, and the second control instruction includes the first control instruction, so that the controller 71 controls the one-to-many heat recovery multi-split air-conditioning system 100 to operate in different working modes, wherein the working mode includes, for example: cooling mode, heating mode, water tank separate heating mode, first cooling and water tank heating mode, second cooling and water tank heating mode, heating and water tank heating mode, and defrost mode. The heat recovery amount in the first cooling and water tank heating mode is lower than the heat recovery amount in the second cooling and water tank heating mode, that is, the first cooling and water tank heating mode is an incomplete heat recovery mode, with lower thermal efficiency but more energy-saving, and the second cooling and water tank heating mode is a complete heat recovery mode, with higher thermal efficiency but no energy-saving.

[0097] In a specific embodiment, the controller 71 controls the status of each component in the regulating unit 130 in different working modes, thereby adjusting the on-off status between the refrigerant circulation loop and the water tank branch, and adjusting the on-off status between the outdoor heat exchanger 2 and the indoor heat exchanger group in the refrigerant circulation loop, so that the refrigerant that does not participate in heat exchange in the refrigerant circulation loop and / or the water tank branch flows back to the compressor 1 based on the pressure difference between the flow path and the inlet of the compressor 1, thereby avoiding refrigerant retention and ensuring the refrigerant quantity during the operation of the air-conditioning system 110, thereby helping to improve the cooling efficiency of the air-conditioning system 110.

[0098] Specifically, a one-to-many heat recovery multi-split air-conditioning system 100 provided according to an embodiment of the present invention includes an interconnected air-conditioning system 110, a hot water system 120, and a regulating unit 130, as well as a controller 71. The hot water system 120 can be used as a condenser. The controller 71 controls the one-to-many heat recovery multi-split air-conditioning system 100 to operate in different operating modes in response to a second control instruction, thereby enriching the operating modes of the one-to-many heat recovery multi-split air-conditioning system 100 and improving its intelligence. At the same time, the controller 71 controls the status of each component in the regulating unit 130 in different operating modes, thereby adjusting the on-off state between the refrigerant circulation loop and the water tank branch, and adjusting the on-off state between the outdoor heat exchanger 2 and the indoor heat exchanger group in the refrigerant circulation loop, so that the refrigerant that does not participate in heat exchange in the refrigerant circulation loop and / or the water tank branch flows back to the compressor 1 based on the pressure difference between the flow path and the inlet of the compressor 1. This can avoid refrigerant retention, ensure the refrigerant amount during operation of the air-conditioning system 110, and thus help improve the cooling efficiency of the air-conditioning system 110.

[0099] like Figure 2 and Figure 3 As shown, in one embodiment of the present invention, the first interface of the first four-way valve 4 is connected to the outlet of the compressor 1, the second interface of the first four-way valve 4 is connected to the outdoor heat exchanger 2, the third interface of the first four-way valve 4 is connected to the indoor heat exchanger group, and the fourth interface of the first four-way valve 4 is connected to the inlet of the compressor 1; the expansion valve group includes: a plurality of first expansion valves 6 connected in parallel, one end of each first expansion valve 6 is connected to one end of the outdoor expansion valve 3, and the other end of each first expansion valve 6 is connected to one end of the corresponding indoor heat exchanger 5.

[0100] In a specific embodiment, the first interface of the first four-way valve 4 (ie Figure 2 and Figure 3 The upper side interface of the first four-way valve 4) is connected to the outlet of the compressor 1, and the second interface of the first four-way valve 4 (i.e. Figure 2 and Figure 3 The right side interface of the first four-way valve 4) is connected to the outdoor heat exchanger 2, and the third interface of the first four-way valve 4 (i.e. Figure 2 and Figure 3 The left interface of the first four-way valve 4) is connected to the indoor heat exchanger group, and the fourth interface of the first four-way valve 4 (i.e. Figure 2 and Figure 3 The lower side interface of the first four-way valve 4 is connected to the inlet of the compressor 1.

[0101] In a specific embodiment, the expansion valve group includes: a plurality of first expansion valves 6 connected in parallel, and both ends of each first expansion valve 6 are connected to the outdoor expansion valve 3 and the corresponding indoor heat exchanger 5 respectively.

[0102] Specifically, the one-to-many heat recovery multi-split air-conditioning system 100 provided according to an embodiment of the present invention can control the inflow on-off state and the outflow on-off state of the indoor heat exchanger group through the expansion valve group, and adjust the refrigerant flow flowing into or out of the indoor heat exchanger group, thereby facilitating the control of the one-to-many heat recovery multi-split air-conditioning system 100.

[0103] Figure 8 FIG. 1 is a schematic diagram of the structure of an adjustment unit according to an embodiment of the present invention. Figure 8As shown, in one embodiment of the present invention, the regulating unit 130 includes: a first switch component 131, one end of the first switch component 131 is connected to the outlet of the compressor 1, the other end of the first switch component 131 is connected to the first interface, and the first switch component 131 is used to control the on-off state between the outlet of the compressor 1 and the refrigerant circulation loop; a second switch component 132, which is arranged on the first water tank branch, one end of the second switch component 132 is connected to the outlet of the compressor 1, the other end of the second switch component 132 is connected to one end of the water tank heat exchanger 21, and the second switch component 132 is used to control the on-off state between the first water tank branch and the refrigerant circulation loop; a first throttling control component 133, one end of the first throttling control component 133 is connected to the refrigerant circulation loop, the other end of the first throttling control component 133 is connected to the inlet of the compressor 1 and the fourth interface, and the first throttling control component 133 is used to make the refrigerant in the outdoor heat exchanger 2 and / or the indoor heat exchanger group reflux or not reflux to the compressor 1 through its own on-off state; a flow regulating component 13 4, is arranged on the path of the second water tank 20, one end of the flow regulating component 134 is connected to the other end of the water tank heat exchanger 21, and the other end of the flow regulating component 134 is connected to one end of the expansion valve group and one end of the outdoor expansion valve 3, and the flow regulating component 134 is used to regulate the flow of refrigerant out of the water tank heat exchanger 21; the third switch component 135, one end of the third switch component 135 is connected to one end of the outdoor expansion valve 3, and the other end of the third switch component 135 is connected to one end of the expansion valve group and one end of the flow regulating component 134. End, the third switch component 135 is used to control the on-off state between the indoor heat exchanger group and the outdoor heat exchanger 2, and to control the on-end state between the second water tank branch and the outdoor heat exchanger 2; the second throttling control component 136, one end of the second throttling control component 136 is connected to the first water tank branch, and the other end of the second throttling control component 136 is connected to the inlet of the compressor 1 and the fourth interface, and the second throttling control component 136 is used to make the refrigerant in the water tank branch reflux or not reflux to the compressor 1 through its own on-off state.

[0104] In a specific embodiment, the first switch component 131 is, for example, Figure 2 and Figure 3 The gas shut-off valve 7 in the first switch assembly 131 has two ends connected to the outlet of the compressor 1 and the first interface respectively. The first switch assembly 131 is used to control the on-off state between the outlet of the compressor 1 and the refrigerant circulation circuit.

[0105] In a specific embodiment, the second switch component 132 is, for example, Figure 2 and Figure 3 The second four-way valve 8, and Figure 3The two ends of the second switch component 132 are respectively connected to the outlet of the compressor 1 and the water tank heat exchanger 21. The second switch component 132 is used to control the on-off state between the first water tank branch and the refrigerant circulation loop.

[0106] In a specific embodiment, the first throttle control component 133 is, for example, Figure 2 and Figure 3 The first capillary tube 10 and the second solenoid valve 11, the two ends of the first throttling control component 133 are respectively connected to the refrigerant circulation loop and the inlet and the fourth interface of the compressor 1. The first throttling control component 133 is used to make the refrigerant in the outdoor heat exchanger 2 and / or the indoor heat exchanger group reflux or not reflux to the compressor 1 through its own on-off state.

[0107] In a specific embodiment, the flow regulating component 134 is, for example, Figure 2 and Figure 3 The second expansion valve 12 in the flow regulating component 134 is respectively connected to the water tank heat exchanger 21 and the expansion valve group and the outdoor expansion valve 3. The flow regulating component 134 is used to regulate the refrigerant flow out of the water tank heat exchanger 21.

[0108] In a specific embodiment, the third switch component 135 is, for example, Figure 2 and Figure 3 The liquid stop valve 13, the two ends of the third switch component 135 are respectively connected to the outdoor expansion valve 3 and the expansion valve group and the flow regulating component 134, and the third switch component 135 is used to control the on-off state between the indoor heat exchanger group and the outdoor heat exchanger 2, as well as the on-end state between the second water tank branch and the outdoor heat exchanger 2.

[0109] In a specific embodiment, the second throttle control component 136 is, for example, Figure 3 The second capillary tube 14 and the third solenoid valve 15, the two ends of the second throttling control component 136 are respectively connected to the first water tank branch and the inlet and the fourth interface of the compressor 1. The second throttling control component 136 is used to make the refrigerant in the water tank branch flow back or not flow back to the compressor 1 through its own on-off state.

[0110] Specifically, the one-to-many heat recovery multi-split air-conditioning system 100 provided according to an embodiment of the present invention, through the cooperation of the first switch component 131, the second switch component 132, the first throttling control component 133, the flow regulating component 134, the third switch component 135 and the second throttling control component 136, enables the regulating unit 130 to adjust the on-off state between the refrigerant circulation loop and the water tank branch, and adjust the on-off state between the outdoor heat exchanger 2 and the indoor heat exchanger group in the refrigerant circulation loop, thereby facilitating the control of the one-to-many heat recovery multi-split air-conditioning system 100.

[0111] like Figure 2 and Figure 3 As shown, in one embodiment of the present invention, the first switch assembly 131 includes: a gas stop valve 7, one end of the gas stop valve 7 is connected to the outlet of the compressor 1, and the other end of the gas stop valve 7 is connected to the first interface.

[0112] In a specific embodiment, the first switch component 131 includes Figure 2 and Figure 3 The gas stop valve 7 has one end connected to the outlet of the compressor 1 and the other end connected to the first interface.

[0113] Specifically, according to the one-to-many heat recovery multi-split air-conditioning system 100 provided in an embodiment of the present invention, the first switch component 131 includes a gas shut-off valve 7, which can control the on-off state between the outlet of the compressor 1 and the refrigerant circulation loop.

[0114] like Figure 2 and Figure 3 As shown, in one embodiment of the present invention, the second switch assembly 132 includes: a second four-way valve 8 provided on the first water tank branch, wherein the fifth interface of the second four-way valve 8 is connected to the outlet of the compressor 1, the sixth interface of the second four-way valve 8 is closed, the seventh interface of the second four-way valve 8 is connected to one end of the water tank heat exchanger 21, and the eighth interface of the second four-way valve 8 is connected to the inlet of the compressor 1.

[0115] In a specific embodiment, the second switch assembly 132 includes Figure 2 and Figure 3 The second four-way valve 8 is arranged on the first water tank branch, the fifth interface of the second four-way valve 8 is connected to the outlet of the compressor 1, the sixth interface of the second four-way valve 8 is closed, the seventh interface of the second four-way valve 8 is connected to one end of the water tank heat exchanger 21, and the eighth interface of the second four-way valve 8 is connected to the inlet of the compressor 1. By switching the connection status of different interfaces of the second four-way valve 8, the on-off state between the first water tank branch and the refrigerant circulation loop can be controlled.

[0116] Specifically, according to the one-to-many heat recovery multi-split air-conditioning system 100 provided in an embodiment of the present invention, the second switch component 132 includes a second four-way valve 8. By switching the connection status of different interfaces of the second four-way valve 8, the on-off status between the first water tank branch and the refrigerant circulation loop can be controlled.

[0117] like Figure 3 As shown, in one embodiment of the present invention, the second switch assembly 132 also includes: a first solenoid valve 9 arranged on the first water tank branch, wherein one end of the first solenoid valve 9 is connected to the outlet of the compressor 1, and the other end of the first solenoid valve 9 is connected to the fifth interface of the second four-way valve 8.

[0118] In a specific embodiment, the second switch component 132 may further include Figure 3 A first solenoid valve 9 is arranged on the first water tank branch, one end of the first solenoid valve 9 is connected to the outlet of the compressor 1, and the other end of the first solenoid valve 9 is connected to the fifth interface of the second four-way valve 8. By controlling the opening and closing state of the first solenoid valve 9, the on-off state between the first water tank branch and the refrigerant circulation circuit can be controlled.

[0119] Specifically, according to the one-to-many heat recovery multi-split air-conditioning system 100 provided in an embodiment of the present invention, the second switch component 132 may also include a first solenoid valve 9. By controlling the opening and closing state of the first solenoid valve 9, the on-off state between the first water tank branch and the refrigerant circulation loop can be controlled.

[0120] like Figure 2 and Figure 3 As shown, in one embodiment of the present invention, the first throttling control component 133 includes: a first capillary 10 and a second solenoid valve 11 connected in series, wherein one end of the first capillary 10 is connected to the other end of the gas shut-off valve 7 and the first interface, the other end of the first capillary 10 is connected to one end of the second solenoid valve 11, and the other end of the second solenoid valve 11 is connected to the inlet of the compressor 1 and the fourth interface.

[0121] In a specific embodiment, the first throttle control assembly 133 includes Figure 2 and Figure 3 The first capillary 10 and the second solenoid valve 11 are connected in series, one end of the first capillary 10 is connected to the other end of the gas shut-off valve 7 and the first interface, the other end of the first capillary 10 is connected to one end of the second solenoid valve 11, and the other end of the second solenoid valve 11 is connected to the inlet of the compressor 1 and the fourth interface.

[0122] Specifically, according to the one-to-many heat recovery multi-split air-conditioning system 100 provided in an embodiment of the present invention, the first throttling control component 133 includes a first capillary tube 10 and a second solenoid valve 11, through which the refrigerant in the outdoor heat exchanger 2 and / or the indoor heat exchanger group can flow back or not flow back to the compressor 1.

[0123] like Figure 2 and Figure 3 As shown, in one embodiment of the present invention, the flow regulating component 134 includes: a second expansion valve 12 arranged on the second water tank branch, wherein one end of the second expansion valve 12 is connected to the other end of the water tank heat exchanger 21, and the other end of the second expansion valve 12 is connected to one end of the expansion valve group and one end of the outdoor expansion valve 3.

[0124] In a specific embodiment, the flow regulating assembly 134 includes Figure 2 and Figure 3 A second expansion valve 12 is provided on the second water tank branch, one end of the second expansion valve 12 is connected to the other end of the water tank heat exchanger 21, and the other end of the second expansion valve 12 is connected to one end of the expansion valve group and one end of the outdoor expansion valve 3.

[0125] Specifically, in the one-to-many heat recovery multi-split air conditioning system 100 provided according to an embodiment of the present invention, the flow regulating component 134 includes a second expansion valve 12, through which the refrigerant flow out of the water tank heat exchanger 21 can be regulated.

[0126] like Figure 2 and Figure 3 As shown, in one embodiment of the present invention, the third switch assembly 135 includes: a liquid stop valve 13, one end of the liquid stop valve 13 is connected to one end of the outdoor expansion valve 3, and the other end of the liquid stop valve 13 is connected to one end of the expansion valve group and one end of the flow regulating assembly 134.

[0127] In a specific embodiment, the third switch assembly 135 includes Figure 2 and Figure 3 The liquid stop valve 13 in the liquid stop valve 13 has its two ends connected to the outdoor expansion valve 3 and the expansion valve group and the flow regulating component 134 respectively.

[0128] Specifically, according to the one-to-many heat recovery multi-split air-conditioning system 100 provided in an embodiment of the present invention, the third switch component 135 includes a liquid stop valve 13, through which the liquid stop valve 13 can control the open-end state between the second water tank branch and the outdoor heat exchanger 2.

[0129] like Figure 3 As shown, in one embodiment of the present invention, the second throttling control component 136 includes: a second capillary tube 14 and a third solenoid valve 15 connected in series, wherein one end of the second capillary tube 14 is connected to the first water tank branch, the other end of the second capillary tube 14 is connected to one end of the third solenoid valve 15, and the other end of the third solenoid valve 15 is connected to the inlet of the compressor 1 and the fourth interface.

[0130] In a specific embodiment, the second throttle control assembly 136 includes Figure 3 The second capillary tube 14 and the third solenoid valve 15 are connected in series, one end of the second capillary tube 14 is connected to the first water tank branch, the other end of the second capillary tube 14 is connected to one end of the third solenoid valve 15, and the other end of the third solenoid valve 15 is connected to the inlet of the compressor 1 and the fourth interface.

[0131] Specifically, according to the one-to-many heat recovery multi-split air-conditioning system 100 provided in an embodiment of the present invention, the second throttling control component 136 includes a second capillary tube 14 and a third solenoid valve 15, through which the refrigerant in the water tank branch can be refluxed or not refluxed to the compressor 1.

[0132] From the above, we can see that Figure 2 As shown, in the one-to-many heat recovery multi-split air-conditioning system 100 provided according to an embodiment of the present invention, all valve components are centrally configured in the outdoor unit module of the air-conditioning system 110, while the indoor unit module of the air-conditioning system 110 only includes an indoor heat exchanger. The indoor unit can significantly reduce mechanical noise and operating vibration, thereby effectively reducing the indoor noise level.

[0133] Figure 9 is a schematic diagram of the refrigerant flow direction in a cooling mode according to an embodiment of the present invention. Figure 10 FIG. 1 is a schematic diagram of the refrigerant flow direction in the cooling mode according to another embodiment of the present invention. Figure 9 and Figure 10 As shown, in one embodiment of the present invention, the working mode includes a cooling mode; when responding to the second control instruction to control the one-to-many heat recovery multi-split air-conditioning system 100 to operate in the cooling mode, the controller 71 is configured to: control the first interface and the second interface of the first four-way valve 4 to be conductive, and control the third interface and the fourth interface of the first four-way valve 4 to be conductive; control the outdoor expansion valve 3 to be fully opened; control the multiple first expansion valves 6 to be opened; control the gas stop valve 7 to be fully opened; control the liquid stop valve 13 to be fully opened; control the second expansion valve 12 to be closed; control the second solenoid valve 11 to be closed; and as shown in FIG. Figure 9 As shown, when the regulating unit 130 does not include the second throttle control component 136, and the second switch component 132 does not include the first solenoid valve 9, the fifth interface and the sixth interface of the second four-way valve 8 are controlled to be connected, and the seventh interface and the eighth interface of the second four-way valve 8 are controlled to be connected; or Figure 10 As shown, when the regulating unit 130 includes a second throttling control component 136 and the second switch component 132 includes a first solenoid valve 9, the fifth interface and the seventh interface of the second four-way valve 8 are controlled to be connected, and the sixth interface and the eighth interface of the second four-way valve 8 are controlled to be connected, and the first solenoid valve 9 is controlled to be closed, and the third solenoid valve 15 is controlled to be opened.

[0134] In a specific embodiment, Figure 9As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in cooling mode, the controller 71 controls the first and second interfaces of the first four-way valve 4 to be connected, and controls the third and fourth interfaces of the first four-way valve 4 to be connected; controls the outdoor expansion valve 3 to be fully open; controls multiple first expansion valves 6 to be opened; controls the gas stop valve 7 to be fully open; controls the liquid stop valve 13 to be fully open; controls the second expansion valve 12 to be closed; controls the second solenoid valve 11 to be closed; controls the fifth and sixth interfaces of the second four-way valve 8 to be connected, and controls the seventh and eighth interfaces of the second four-way valve 8 to be connected.

[0135] In a specific embodiment, Figure 9 As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in cooling mode, the refrigerant flows out of the compressor 1, flows through the gas stop valve 7, the first four-way valve 4, the outdoor heat exchanger 2, the outdoor expansion valve 3, the liquid stop valve 13, multiple first expansion valves 6, multiple indoor heat exchangers 5 and the first four-way valve 4 in sequence, and then flows into the compressor 1 again, completing the refrigerant cycle.

[0136] In a specific embodiment, Figure 9 As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in cooling mode, since the hot water system 120 is not involved, refrigerant is retained in the water tank branch. The refrigerant retained in the water tank branch flows back to the compressor 1 through the pipeline between the sixth interface and the inlet of the compressor 1 based on the pressure difference between the flow path where it is located and the inlet of the compressor 1. This can avoid refrigerant retention and ensure the refrigerant amount when the air-conditioning system 110 is in operation, thereby helping to improve the cooling efficiency of the air-conditioning system 110.

[0137] In a specific embodiment, Figure 10 As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in cooling mode, the controller 71 controls the first and second interfaces of the first four-way valve 4 to be connected, and controls the third and fourth interfaces of the first four-way valve 4 to be connected; controls the outdoor expansion valve 3 to be fully open; controls multiple first expansion valves 6 to be opened; controls the gas stop valve 7 to be fully open; controls the liquid stop valve 13 to be fully open; controls the second expansion valve 12 to be closed; controls the second solenoid valve 11 to be closed; controls the fifth and seventh interfaces of the second four-way valve 8 to be connected, and controls the sixth and eighth interfaces of the second four-way valve 8 to be connected, controls the first solenoid valve 9 to be closed, and controls the third solenoid valve 15 to be opened.

[0138] In a specific embodiment, Figure 10As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in cooling mode, the refrigerant flows out of the compressor 1, flows through the gas stop valve 7, the first four-way valve 4, the outdoor heat exchanger 2, the outdoor expansion valve 3, the liquid stop valve 13, multiple first expansion valves 6, multiple indoor heat exchangers 5 and the first four-way valve 4 in sequence, and then flows into the compressor 1 again, completing the refrigerant cycle.

[0139] In a specific embodiment, Figure 10 As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in cooling mode, since the hot water system 120 is not involved, refrigerant is retained in the water tank branch. The refrigerant retained in the water tank branch flows back to the compressor 1 through the second capillary 14 and the third solenoid valve 15 based on the pressure difference between the flow path where it is located and the inlet of the compressor 1. This can avoid refrigerant retention and ensure the refrigerant quantity when the air-conditioning system 110 is in operation, thereby helping to improve the cooling efficiency of the air-conditioning system 110.

[0140] Specifically, according to the one-to-many heat recovery multi-split air-conditioning system 100 provided in an embodiment of the present invention, when responding to the second control instruction and controlling the one-to-many heat recovery multi-split air-conditioning system 100 to operate in the cooling mode, the controller 71 controls the corresponding valve to open so that the refrigerant flows through the outdoor heat exchanger 2 and multiple indoor heat exchangers 5 in sequence, and the refrigerant in the water tank branch that does not participate in the heat exchange is returned to the compressor 1 based on the pressure difference between the flow path and the inlet of the compressor 1, thereby avoiding refrigerant retention and ensuring the refrigerant amount when the air-conditioning system 110 is in operation, thereby helping to improve the cooling efficiency of the air-conditioning system 110.

[0141] Figure 11 is a schematic diagram of the refrigerant flow in the heating mode according to an embodiment of the present invention. Figure 12 FIG. 1 is a schematic diagram of the refrigerant flow direction in the heating mode according to another embodiment of the present invention. Figure 11 and Figure 12As shown, in one embodiment of the present invention, the working mode includes a heating mode; in response to the second control instruction, when controlling the one-to-many heat recovery multi-split air-conditioning system 100 to operate in the heating mode, the controller 71 is configured to: control the first interface and the third interface of the first four-way valve 4 to be connected, and control the second interface and the fourth interface of the first four-way valve 4 to be connected; control the outdoor expansion valve 3 to be opened; control the multiple first expansion valves 6 to be opened; control the gas stop valve 7 to be fully opened; control the liquid stop valve 13 to be fully opened; control the second expansion valve 12 to be closed; control the second solenoid valve 11 to be closed; and when the regulating unit 1 30 does not include the second throttling control component 136, and the second switch component 132 does not include the first solenoid valve 9, the fifth interface and the sixth interface of the second four-way valve 8 are controlled to be connected, and the seventh interface and the eighth interface of the second four-way valve 8 are controlled to be connected; or, when the regulating unit 130 includes the second throttling control component 136, and the second switch component 132 includes the first solenoid valve 9, the fifth interface and the seventh interface of the second four-way valve 8 are controlled to be connected, and the sixth interface and the eighth interface of the second four-way valve 8 are controlled to be connected, and the first solenoid valve 9 is controlled to be closed, and the third solenoid valve 15 is controlled to be opened.

[0142] In a specific embodiment, Figure 11 As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in heating mode, the controller 71 controls the first and third interfaces of the first four-way valve 4 to be connected, and controls the second and fourth interfaces of the first four-way valve 4 to be connected; controls the outdoor expansion valve 3 to be opened; controls multiple first expansion valves 6 to be opened; controls the gas stop valve 7 to be fully opened; controls the liquid stop valve 13 to be fully opened; controls the second expansion valve 12 to be closed; controls the second solenoid valve 11 to be closed; controls the fifth and sixth interfaces of the second four-way valve 8 to be connected, and controls the seventh and eighth interfaces of the second four-way valve 8 to be connected.

[0143] In a specific embodiment, Figure 11 As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in heating mode, the refrigerant flows out of the compressor 1, flows through the gas stop valve 7, the first four-way valve 4, multiple indoor heat exchangers 5, multiple first expansion valves 6, the liquid stop valve 13, the outdoor expansion valve 3, the outdoor heat exchanger 2 and the first four-way valve 4 in sequence, and then flows into the compressor 1 again, completing the refrigerant cycle.

[0144] In a specific embodiment, Figure 11As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in heating mode, since the hot water system 120 is not involved, refrigerant is retained in the water tank branch. The refrigerant retained in the water tank branch flows back to the compressor 1 through the pipeline between the sixth interface and the inlet of the compressor 1 based on the pressure difference between the flow path where it is located and the inlet of the compressor 1. This can avoid refrigerant retention and ensure the refrigerant quantity when the air-conditioning system 110 is in operation, thereby helping to improve the cooling efficiency of the air-conditioning system 110.

[0145] In a specific embodiment, Figure 12 As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in heating mode, the controller 71 controls the first and third interfaces of the first four-way valve 4 to be connected, and controls the second and fourth interfaces of the first four-way valve 4 to be connected; controls the outdoor expansion valve 3 to be opened; controls multiple first expansion valves 6 to be opened; controls the gas stop valve 7 to be fully opened; controls the liquid stop valve 13 to be fully opened; controls the second expansion valve 12 to be closed; controls the second solenoid valve 11 to be closed; controls the fifth and seventh interfaces of the second four-way valve 8 to be connected, and controls the sixth and eighth interfaces of the second four-way valve 8 to be connected, controls the first solenoid valve 9 to be closed, and controls the third solenoid valve 15 to be opened.

[0146] In a specific embodiment, Figure 12 As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in heating mode, the refrigerant flows out of the compressor 1, flows through the gas stop valve 7, the first four-way valve 4, multiple indoor heat exchangers 5, multiple first expansion valves 6, the liquid stop valve 13, the outdoor expansion valve 3, the outdoor heat exchanger 2 and the first four-way valve 4 in sequence, and then flows into the compressor 1 again, completing the refrigerant cycle.

[0147] In a specific embodiment, Figure 12 As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in heating mode, since the hot water system 120 is not involved, refrigerant is retained in the water tank branch. The refrigerant retained in the water tank branch flows back to the compressor 1 through the second capillary 14 and the third solenoid valve 15 based on the pressure difference between the flow path where it is located and the inlet of the compressor 1. This can avoid refrigerant retention and ensure the refrigerant quantity when the air-conditioning system 110 is in operation, thereby helping to improve the cooling efficiency of the air-conditioning system 110.

[0148] Specifically, according to the one-to-many heat recovery multi-split air-conditioning system 100 provided in an embodiment of the present invention, when responding to the second control instruction and controlling the one-to-many heat recovery multi-split air-conditioning system 100 to operate in the heating mode, the controller 71 controls the corresponding valve to open so that the refrigerant flows through multiple indoor heat exchangers 5 and outdoor heat exchangers 2 in sequence, and the refrigerant in the water tank branch that does not participate in the heat exchange is returned to the compressor 1 based on the pressure difference between the flow path and the inlet of the compressor 1, thereby avoiding refrigerant retention and ensuring the refrigerant quantity when the air-conditioning system 110 is in operation, thereby helping to improve the cooling efficiency of the air-conditioning system 110.

[0149] Figure 13 1 is a schematic diagram of the refrigerant flow direction in a water tank heating mode according to an embodiment of the present invention. Figure 14 FIG. 1 is a schematic diagram of the refrigerant flow direction in the water tank heating mode according to another embodiment of the present invention. Figure 13 and Figure 14 As shown, in one embodiment of the present invention, the working mode includes a water tank heating mode; in response to the second control instruction, when the one-to-many heat recovery multi-split air-conditioning system 100 is controlled to operate in the water tank heating mode, the controller 71 is configured to: control the first interface and the third interface of the first four-way valve 4 to be connected, and control the second interface and the fourth interface of the first four-way valve 4 to be connected; control the outdoor expansion valve 3 to be opened; control the multiple first expansion valves 6 to be closed; control the gas stop valve 7 to be closed; control the liquid stop valve 13 to be fully opened; control the second expansion valve 12 to be fully opened; control the second solenoid valve 11 to be opened; and when the adjustment When the regulating unit 130 does not include the second throttling control component 136 and the second switch component 132 does not include the first solenoid valve 9, the fifth interface and the seventh interface of the second four-way valve 8 are controlled to be connected, and the sixth interface and the eighth interface of the second four-way valve 8 are controlled to be connected; or, when the regulating unit 130 includes the second throttling control component 136 and the second switch component 132 includes the first solenoid valve 9, the fifth interface and the seventh interface of the second four-way valve 8 are controlled to be connected, and the sixth interface and the eighth interface of the second four-way valve 8 are controlled to be connected, and the first solenoid valve 9 is controlled to be opened, and the third solenoid valve 15 is controlled to be closed.

[0150] In a specific embodiment, Figure 13 As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in the water tank separate heating mode, the controller 71 controls the first interface and the third interface of the first four-way valve 4 to be connected, and controls the second interface and the fourth interface of the first four-way valve 4 to be connected; controls the outdoor expansion valve 3 to be opened; controls the multiple first expansion valves 6 to be closed; controls the gas stop valve 7 to be closed; controls the liquid stop valve 13 to be fully opened; controls the second expansion valve 12 to be fully opened; controls the second solenoid valve 11 to be opened; controls the fifth interface and the seventh interface of the second four-way valve 8 to be connected, and controls the sixth interface and the eighth interface of the second four-way valve 8 to be connected.

[0151] In a specific embodiment, Figure 13 As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in the water tank separate heating mode, the refrigerant flows out of the compressor 1, flows through the second four-way valve 8, the water tank heat exchanger 21, the second expansion valve 12, the liquid stop valve 13, the outdoor expansion valve 3, the outdoor heat exchanger 2 and the first four-way valve 4 in sequence, and then flows into the compressor 1 again, completing the refrigerant cycle.

[0152] In a specific embodiment, Figure 13 As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in the water tank separate heating mode, since the multiple indoor heat exchangers 5 are not involved, refrigerant is retained in the refrigerant circulation loop. The refrigerant retained in the refrigerant circulation loop flows back to the compressor 1 through the first capillary 10 and the second solenoid valve 11 based on the pressure difference between the flow path and the inlet of the compressor 1. This can avoid refrigerant retention and ensure the refrigerant quantity when the air-conditioning system 110 is in operation, thereby helping to improve the cooling efficiency of the air-conditioning system 110.

[0153] In a specific embodiment, Figure 14 As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in the water tank separate heating mode, the controller 71 controls the first interface and the third interface of the first four-way valve 4 to be connected, and controls the second interface and the fourth interface of the first four-way valve 4 to be connected; controls the outdoor expansion valve 3 to be opened; controls multiple first expansion valves 6 to be closed; controls the gas stop valve 7 to be closed; controls the liquid stop valve 13 to be fully opened; controls the second expansion valve 12 to be fully opened; controls the second solenoid valve 11 to be opened; controls the fifth interface and the seventh interface of the second four-way valve 8 to be connected, and controls the sixth interface and the eighth interface of the second four-way valve 8 to be connected, controls the first solenoid valve 9 to be opened, and controls the third solenoid valve 15 to be closed.

[0154] In a specific embodiment, Figure 14 As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in the water tank separate heating mode, the refrigerant flows out of the compressor 1, flows through the first solenoid valve 9, the second four-way valve 8, the water tank heat exchanger 21, the second expansion valve 12, the liquid stop valve 13, the outdoor expansion valve 3, the outdoor heat exchanger 2 and the first four-way valve 4 in sequence, and then flows into the compressor 1 again, completing the refrigerant cycle.

[0155] In a specific embodiment, Figure 14As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in the water tank separate heating mode, since the multiple indoor heat exchangers 5 are not involved, refrigerant is retained in the refrigerant circulation loop. The refrigerant retained in the refrigerant circulation loop flows back to the compressor 1 through the first capillary 10 and the second solenoid valve 11 based on the pressure difference between the flow path and the inlet of the compressor 1. This can avoid refrigerant retention and ensure the refrigerant quantity when the air-conditioning system 110 is in operation, thereby helping to improve the cooling efficiency of the air-conditioning system 110.

[0156] Specifically, according to the one-to-many heat recovery multi-split air-conditioning system 100 provided in an embodiment of the present invention, when responding to the second control instruction and controlling the one-to-many heat recovery multi-split air-conditioning system 100 to operate in the water tank separate heating mode, the controller 71 controls the corresponding valve to open so that the refrigerant flows through the water tank heat exchanger 21 and the outdoor heat exchanger 2 in sequence, and the refrigerant that does not participate in the heat exchange in the refrigerant circulation loop is returned to the compressor 1 based on the pressure difference between the flow path and the inlet of the compressor 1, thereby avoiding refrigerant retention and ensuring the refrigerant quantity when the air-conditioning system 110 is in operation, thereby helping to improve the cooling efficiency of the air-conditioning system 110.

[0157] Figure 15 2 is a schematic diagram of the refrigerant flow direction in the first cooling and water tank heating mode according to an embodiment of the present invention. Figure 16 FIG. 1 is a schematic diagram of the refrigerant flow direction in the first cooling and water tank heating mode according to another embodiment of the present invention. Figure 15 and Figure 16 As shown, in one embodiment of the present invention, the working mode includes a first cooling and water tank heating mode; when responding to the second control instruction to control the one-to-many heat recovery multi-split air-conditioning system 100 to operate in the first cooling and water tank heating mode, the controller 71 is configured to: control the first interface and the second interface of the first four-way valve 4 to be conductive, and control the third interface and the fourth interface of the first four-way valve 4 to be conductive; control the outdoor expansion valve 3 to be fully opened; control the multiple first expansion valves 6 to be opened; control the gas stop valve 7 to be fully opened; control the liquid stop valve 13 to be fully opened; control the second expansion valve 12 to be fully opened; control the second solenoid valve 11 to be closed; and When the regulating unit 130 does not include the second throttling control component 136 and the second switch component 132 does not include the first solenoid valve 9, the fifth interface and the seventh interface of the second four-way valve 8 are controlled to be connected, and the sixth interface and the eighth interface of the second four-way valve 8 are controlled to be connected; or, when the regulating unit 130 includes the second throttling control component 136 and the second switch component 132 includes the first solenoid valve 9, the fifth interface and the seventh interface of the second four-way valve 8 are controlled to be connected, and the sixth interface and the eighth interface of the second four-way valve 8 are controlled to be connected, and the first solenoid valve 9 is controlled to be fully opened, and the third solenoid valve 15 is controlled to be closed.

[0158] In a specific embodiment, Figure 15 As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in the first cooling and water tank heating mode, the controller 71 controls the first interface and the second interface of the first four-way valve 4 to be connected, and controls the third interface and the fourth interface of the first four-way valve 4 to be connected; controls the outdoor expansion valve 3 to be fully opened; controls multiple first expansion valves 6 to be opened; controls the gas stop valve 7 to be fully opened; controls the liquid stop valve 13 to be fully opened; controls the second expansion valve 12 to be fully opened; controls the second solenoid valve 11 to be closed; controls the fifth interface and the seventh interface of the second four-way valve 8 to be connected, and controls the sixth interface and the eighth interface of the second four-way valve 8 to be connected.

[0159] In a specific embodiment, Figure 15 As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in the first cooling and water tank heating mode, after the refrigerant flows out of the compressor 1, one path flows through the gas stop valve 7, the first four-way valve 4, the outdoor heat exchanger 2, the outdoor expansion valve 3, the liquid stop valve 13, multiple first expansion valves 6, multiple indoor heat exchangers 5 and the first four-way valve 4 in sequence before flowing into the compressor 1 again, and the other path flows through the second four-way valve 8, the water tank heat exchanger 21, the second expansion valve 12, multiple first expansion valves 6, multiple indoor heat exchangers 5 and the first four-way valve 4 in sequence before flowing into the compressor 1 again, completing the refrigerant cycle.

[0160] In a specific embodiment, Figure 16 As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in the first cooling and water tank heating mode, the controller 71 controls the first and second interfaces of the first four-way valve 4 to be connected, and controls the third and fourth interfaces of the first four-way valve 4 to be connected; controls the outdoor expansion valve 3 to be fully open; controls multiple first expansion valves 6 to be opened; controls the gas stop valve 7 to be fully open; controls the liquid stop valve 13 to be fully open; controls the second expansion valve 12 to be fully open; controls the second solenoid valve 11 to be closed; controls the fifth and seventh interfaces of the second four-way valve 8 to be connected, and controls the sixth and eighth interfaces of the second four-way valve 8 to be connected, controls the first solenoid valve 9 to be fully open, and controls the third solenoid valve 15 to be closed.

[0161] In a specific embodiment, Figure 16 As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in the first cooling and water tank heating mode, after the refrigerant flows out of the compressor 1, one path flows through the gas stop valve 7, the first four-way valve 4, the outdoor heat exchanger 2, the outdoor expansion valve 3, the liquid stop valve 13, multiple first expansion valves 6, multiple indoor heat exchangers 5 and the first four-way valve 4 in sequence before flowing into the compressor 1 again, and the other path flows through the first solenoid valve 9, the second four-way valve 8, the water tank heat exchanger 21, the second expansion valve 12, multiple first expansion valves 6, multiple indoor heat exchangers 5 and the first four-way valve 4 in sequence before flowing into the compressor 1 again, completing the refrigerant cycle.

[0162] Specifically, according to the one-to-many heat recovery multi-split air-conditioning system 100 provided in an embodiment of the present invention, when responding to the second control instruction and controlling the one-to-many heat recovery multi-split air-conditioning system 100 to operate in the first cooling and water tank heating mode, the controller 71 controls the corresponding valves to open so that the refrigerant flows through the outdoor heat exchanger 2, the water tank heat exchanger 21 and multiple indoor heat exchangers 5 in sequence, and uses the heat generated during the operation of the air conditioner to heat the water, organically combining the cooling and hot water functions, which helps to improve energy utilization efficiency.

[0163] Figure 17 2 is a schematic diagram of the refrigerant flow direction in the second cooling and water tank heating mode according to an embodiment of the present invention. Figure 18 FIG. 1 is a schematic diagram of the refrigerant flow direction in the second cooling and water tank heating mode according to another embodiment of the present invention. Figure 17 and Figure 18 As shown, the working mode includes a second cooling and water tank heating mode; in response to the second control instruction, when controlling the one-to-many heat recovery multi-split air-conditioning system 100 to operate in the second cooling and water tank heating mode, the controller 71 is configured to: control the first interface and the second interface of the first four-way valve 4 to be connected, and control the third interface and the fourth interface of the first four-way valve 4 to be connected; control the outdoor expansion valve 3 to be closed; control the multiple first expansion valves 6 to be opened; control the gas stop valve 7 to be closed; control the liquid stop valve 13 to be closed; control the second expansion valve 12 to be fully opened; control the second solenoid valve 11 to be opened; and when the regulating unit When 130 does not include the second throttling control component 136 and the second switch component 132 does not include the first solenoid valve 9, the fifth interface and the seventh interface of the second four-way valve 8 are controlled to be connected, and the sixth interface and the eighth interface of the second four-way valve 8 are controlled to be connected; or, when the regulating unit 130 includes the second throttling control component 136 and the second switch component 132 includes the first solenoid valve 9, the fifth interface and the seventh interface of the second four-way valve 8 are controlled to be connected, and the sixth interface and the eighth interface of the second four-way valve 8 are controlled to be connected, and the first solenoid valve 9 is controlled to be fully opened, and the third solenoid valve 15 is controlled to be closed.

[0164] In a specific embodiment, Figure 17 As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in the second cooling and water tank heating mode, the controller 71 controls the first and second interfaces of the first four-way valve 4 to be connected, and controls the third and fourth interfaces of the first four-way valve 4 to be connected; controls the outdoor expansion valve 3 to be closed; controls multiple first expansion valves 6 to be opened; controls the gas stop valve 7 to be closed; controls the liquid stop valve 13 to be closed; controls the second expansion valve 12 to be fully opened; controls the second solenoid valve 11 to be opened; controls the fifth and seventh interfaces of the second four-way valve 8 to be connected, and controls the sixth and eighth interfaces of the second four-way valve 8 to be connected.

[0165] In a specific embodiment, Figure 17 As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in the second cooling and water tank heating mode, the refrigerant flows out of the compressor 1, flows through the second four-way valve 8, the water tank heat exchanger 21, the second expansion valve 12, multiple first expansion valves 6, multiple indoor heat exchangers 5 and the first four-way valve 4 in sequence, and then flows into the compressor 1 again to complete the refrigerant cycle; it can be seen that in the second cooling and water tank heating mode, the refrigerant flows through the water tank heat exchanger 21 and multiple indoor heat exchangers 5 in sequence. Compared with the first cooling and water tank heating mode in which the refrigerant flows through the outdoor heat exchanger 2, the water tank heat exchanger 21 and multiple indoor heat exchangers 5 in sequence, the refrigerant in the second cooling and water tank heating mode does not need to flow through the outdoor heat exchanger 2, thereby reducing heat loss. Therefore, the heat recovery amount in the second cooling and water tank heating mode is higher than the heat recovery amount in the first cooling and water tank heating mode.

[0166] In a specific embodiment, Figure 17 As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in the second cooling and water tank heating mode, since the outdoor heat exchanger 2 is not involved, refrigerant is retained in the refrigerant circulation loop. The refrigerant retained in the refrigerant circulation loop flows back to the compressor 1 through the first capillary tube 10 and the second solenoid valve 11 based on the pressure difference between the flow path and the inlet of the compressor 1. This can avoid refrigerant retention and ensure the refrigerant quantity when the air-conditioning system 110 is in operation, thereby helping to improve the cooling efficiency of the air-conditioning system 110.

[0167] In a specific embodiment, Figure 18 As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in the second cooling and water tank heating mode, the controller 71 controls the first and second interfaces of the first four-way valve 4 to be connected, and controls the third and fourth interfaces of the first four-way valve 4 to be connected; controls the outdoor expansion valve 3 to be closed; controls multiple first expansion valves 6 to be opened; controls the gas stop valve 7 to be closed; controls the liquid stop valve 13 to be closed; controls the second expansion valve 12 to be fully opened; controls the second solenoid valve 11 to be opened; controls the fifth and seventh interfaces of the second four-way valve 8 to be connected, and controls the sixth and eighth interfaces of the second four-way valve 8 to be connected, controls the first solenoid valve 9 to be fully opened, and controls the third solenoid valve 15 to be closed.

[0168] In a specific embodiment, Figure 18As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in the second cooling and water tank heating mode, the refrigerant flows out of the compressor 1, flows through the first solenoid valve 9, the second four-way valve 8, the water tank heat exchanger 21, the second expansion valve 12, multiple first expansion valves 6, multiple indoor heat exchangers 5 and the first four-way valve 4 in sequence, and then flows into the compressor 1 again to complete the refrigerant cycle; it can be seen that in the second cooling and water tank heating mode, the refrigerant flows through the water tank heat exchanger 21 and multiple indoor heat exchangers 5 in sequence. Compared with the first cooling and water tank heating mode in which the refrigerant flows through the outdoor heat exchanger 2, the water tank heat exchanger 21 and multiple indoor heat exchangers 5 in sequence, the refrigerant in the second cooling and water tank heating mode does not need to flow through the outdoor heat exchanger 2, thereby reducing heat loss. Therefore, the heat recovery amount in the second cooling and water tank heating mode is higher than the heat recovery amount in the first cooling and water tank heating mode.

[0169] In a specific embodiment, Figure 18 As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in the second cooling and water tank heating mode, since the outdoor heat exchanger 2 is not involved, refrigerant is retained in the refrigerant circulation loop. The refrigerant retained in the refrigerant circulation loop flows back to the compressor 1 through the first capillary tube 10 and the second solenoid valve 11 based on the pressure difference between the flow path and the inlet of the compressor 1. This can avoid refrigerant retention and ensure the refrigerant quantity when the air-conditioning system 110 is in operation, thereby helping to improve the cooling efficiency of the air-conditioning system 110.

[0170] Specifically, according to the one-to-many heat recovery multi-split air-conditioning system 100 provided in an embodiment of the present invention, when responding to the second control instruction and controlling the one-to-many heat recovery multi-split air-conditioning system 100 to operate the second cooling and water tank heating mode, the controller 71 controls the corresponding valve to open so that the refrigerant flows through the water tank heat exchanger 21 and multiple indoor heat exchangers 5 in sequence, and uses the heat generated during the operation of the air conditioner to heat the water, organically combining the cooling and hot water functions, which helps to improve energy utilization efficiency, and returns the refrigerant that does not participate in heat exchange in the refrigerant circulation loop to the compressor 1 based on the pressure difference between the flow path and the inlet of the compressor 1, thereby avoiding refrigerant retention and ensuring the refrigerant quantity when the air-conditioning system 110 is in operation, thereby helping to improve the cooling efficiency of the air-conditioning system 110.

[0171] Figure 19 Schematic diagram of refrigerant flow in heating and water tank heating modes according to an embodiment of the present invention. Figure 20 FIG. 1 is a schematic diagram of the refrigerant flow direction in the heating and water tank heating modes according to another embodiment of the present invention. Figure 19 and Figure 20As shown, in one embodiment of the present invention, the working mode includes heating and water tank heating modes; in response to the second control instruction, when controlling the one-to-many heat recovery multi-split air-conditioning system 100 to operate in heating and water tank heating modes, the controller 71 is configured to: control the first interface and the third interface of the first four-way valve 4 to be connected, and control the second interface and the fourth interface of the first four-way valve 4 to be connected; control the outdoor expansion valve 3 to be opened; control the multiple first expansion valves 6 to be opened; control the gas stop valve 7 to be fully opened; control the liquid stop valve 13 to be fully opened; control the second expansion valve 12 to be fully opened; control the second solenoid valve 11 to be closed; and when When the regulating unit 130 does not include the second throttling control component 136 and the second switch component 132 does not include the first solenoid valve 9, the fifth interface and the seventh interface of the second four-way valve 8 are controlled to be connected, and the sixth interface and the eighth interface of the second four-way valve 8 are controlled to be connected; or, when the regulating unit 130 includes the second throttling control component 136 and the second switch component 132 includes the first solenoid valve 9, the fifth interface and the seventh interface of the second four-way valve 8 are controlled to be connected, and the sixth interface and the eighth interface of the second four-way valve 8 are controlled to be connected, and the first solenoid valve 9 is controlled to be fully opened, and the third solenoid valve 15 is controlled to be closed.

[0172] In a specific embodiment, Figure 19 As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in heating and water tank heating modes, the controller 71 controls the first and third interfaces of the first four-way valve 4 to be connected, and controls the second and fourth interfaces of the first four-way valve 4 to be connected; controls the outdoor expansion valve 3 to be opened; controls multiple first expansion valves 6 to be opened; controls the gas stop valve 7 to be fully opened; controls the liquid stop valve 13 to be fully opened; controls the second expansion valve 12 to be fully opened; controls the second solenoid valve 11 to be closed; controls the fifth and seventh interfaces of the second four-way valve 8 to be connected, and controls the sixth and eighth interfaces of the second four-way valve 8 to be connected.

[0173] In a specific embodiment, Figure 19 As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in heating and water tank heating modes, after the refrigerant flows out of the compressor 1, one path flows through the gas stop valve 7, the first four-way valve 4, multiple indoor heat exchangers 5, multiple first expansion valves 6, the liquid stop valve 13, the outdoor expansion valve 3, the outdoor heat exchanger 2 and the first four-way valve 4 in sequence before flowing into the compressor 1 again, and the other path flows through the second four-way valve 8, the water tank heat exchanger 21, the second expansion valve 12, the liquid stop valve 13, the outdoor expansion valve 3, the outdoor heat exchanger 2 and the first four-way valve 4 in sequence before flowing into the compressor 1 again, completing the refrigerant cycle.

[0174] In a specific embodiment, Figure 20As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in heating and water tank heating modes, the controller 71 controls the first and third interfaces of the first four-way valve 4 to be connected, and controls the second and fourth interfaces of the first four-way valve 4 to be connected; controls the outdoor expansion valve 3 to be opened; controls multiple first expansion valves 6 to be opened; controls the gas stop valve 7 to be fully opened; controls the liquid stop valve 13 to be fully opened; controls the second expansion valve 12 to be fully opened; controls the second solenoid valve 11 to be closed; controls the fifth and seventh interfaces of the second four-way valve 8 to be connected, and controls the sixth and eighth interfaces of the second four-way valve 8 to be connected, controls the first solenoid valve 9 to be fully opened, and controls the third solenoid valve 15 to be closed.

[0175] In a specific embodiment, Figure 20 As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in heating and water tank heating modes, after the refrigerant flows out of the compressor 1, one path flows through the gas stop valve 7, the first four-way valve 4, multiple indoor heat exchangers 5, multiple first expansion valves 6, the liquid stop valve 13, the outdoor expansion valve 3, the outdoor heat exchanger 2 and the first four-way valve 4 in sequence before flowing into the compressor 1 again, and the other path flows through the first solenoid valve 9, the second four-way valve 8, the water tank heat exchanger 21, the second expansion valve 12, the liquid stop valve 13, the outdoor expansion valve 3, the outdoor heat exchanger 2 and the first four-way valve 4 in sequence before flowing into the compressor 1 again, completing the refrigerant cycle.

[0176] Specifically, according to the one-to-many heat recovery multi-split air-conditioning system 100 provided in an embodiment of the present invention, when responding to the second control instruction and controlling the one-to-many heat recovery multi-split air-conditioning system 100 to operate in heating and water tank heating modes, the controller 71 controls the corresponding valves to open so that the refrigerant flows through multiple indoor heat exchangers 5, water tank heat exchangers 21 and outdoor heat exchangers 2 in sequence, and uses the heat generated during the operation of the air conditioner to heat the water, organically combining the heating and hot water functions, which helps to improve energy utilization efficiency.

[0177] Figure 21 FIG. 1 is a schematic diagram of refrigerant flow in a defrosting mode according to an embodiment of the present invention. Figure 22 FIG. 1 is a schematic diagram of the refrigerant flow direction in the defrosting mode according to another embodiment of the present invention. Figure 21 and Figure 22As shown, in one embodiment of the present invention, the working mode includes a defrost mode; in response to the first control instruction, when controlling the one-to-many heat recovery multi-split air-conditioning system 100 to operate in the defrost mode, the controller 71 is configured to: control the first interface and the second interface of the first four-way valve 4 to be connected, and control the third interface and the fourth interface of the first four-way valve 4 to be connected; control the outdoor expansion valve 3 to be fully opened; control the multiple first expansion valves 6 to be closed; control the gas stop valve 7 to be fully opened; control the liquid stop valve 13 to be fully opened; control the second expansion valve 12 to be opened; control the second solenoid valve 11 to be closed; and when the regulating unit 1 30 does not include the second throttling control component 136, and the second switch component 132 does not include the first solenoid valve 9, the fifth interface and the sixth interface of the second four-way valve 8 are controlled to be connected, and the seventh interface and the eighth interface of the second four-way valve 8 are controlled to be connected; or, when the regulating unit 130 includes the second throttling control component 136, and the second switch component 132 includes the first solenoid valve 9, the fifth interface and the sixth interface of the second four-way valve 8 are controlled to be connected, and the seventh interface and the eighth interface of the second four-way valve 8 are controlled to be connected, and the first solenoid valve 9 is controlled to be closed, and the third solenoid valve 15 is controlled to be closed.

[0178] In a specific embodiment, Figure 21 As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in defrost mode, the controller 71 controls the first and second interfaces of the first four-way valve 4 to be connected, and controls the third and fourth interfaces of the first four-way valve 4 to be connected; controls the outdoor expansion valve 3 to be fully opened; controls multiple first expansion valves 6 to be closed; controls the gas stop valve 7 to be fully opened; controls the liquid stop valve 13 to be fully opened; controls the second expansion valve 12 to be opened; controls the second solenoid valve 11 to be closed; controls the fifth and sixth interfaces of the second four-way valve 8 to be connected, and controls the seventh and eighth interfaces of the second four-way valve 8 to be connected.

[0179] In a specific embodiment, Figure 21 As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in defrost mode, the refrigerant flows out of the compressor 1, flows through the gas stop valve 7, the first four-way valve 4, the outdoor heat exchanger 2, the outdoor expansion valve 3, the liquid stop valve 13, the second expansion valve 12, the water tank heat exchanger 21, the second four-way valve 8, and then flows into the compressor 1 again, completing the refrigerant cycle.

[0180] In a specific embodiment, Figure 22As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in defrost mode, the controller 71 controls the first and second interfaces of the first four-way valve 4 to be connected, and controls the third and fourth interfaces of the first four-way valve 4 to be connected; controls the outdoor expansion valve 3 to be fully open; controls multiple first expansion valves 6 to be closed; controls the gas stop valve 7 to be fully open; controls the liquid stop valve 13 to be fully open; controls the second expansion valve 12 to be opened; controls the second solenoid valve 11 to be closed; controls the fifth and sixth interfaces of the second four-way valve 8 to be connected, and controls the seventh and eighth interfaces of the second four-way valve 8 to be connected, controls the first solenoid valve 9 to be closed, and controls the third solenoid valve 15 to be closed.

[0181] In a specific embodiment, Figure 22 As shown, when the one-to-many heat recovery multi-split air-conditioning system 100 operates in defrost mode, the refrigerant flows out of the compressor 1, flows through the gas stop valve 7, the first four-way valve 4, the outdoor heat exchanger 2, the outdoor expansion valve 3, the liquid stop valve 13, the second expansion valve 12, the water tank heat exchanger 21, the second four-way valve 8, and then flows into the compressor 1 again, completing the refrigerant cycle.

[0182] Specifically, according to the one-to-many heat recovery multi-split air-conditioning system 100 provided in an embodiment of the present invention, when responding to the first control instruction and controlling the one-to-many heat recovery multi-split air-conditioning system 100 to operate in the defrost mode, the controller 71 controls the corresponding valve to open so that the refrigerant flows through the outdoor heat exchanger 2 and the water tank heat exchanger 21 in sequence, and the water tank heat exchanger 21 is used as an evaporator. The refrigerant in the water tank branch is heated by the water in the water tank 20. The heated refrigerant flows through the compressor 1 and then exchanges heat with the outdoor heat exchanger 2 to defrost the outdoor heat exchanger 2, thereby transferring the heat in the water tank to the outdoor heat exchanger 2, which not only effectively speeds up the defrost speed, but also significantly reduces the impact on the indoor temperature, ensuring the efficient operation and stability of the air-conditioning system 110 in a low temperature environment, thereby improving the overall operating performance and avoiding the negative impact of temperature fluctuations during the defrost process on user comfort.

[0183] Figure 23 is a first installation diagram of a supercooling device according to one embodiment of the present invention, Figure 24 is a second installation diagram of a supercooling device according to one embodiment of the present invention, Figure 25 is a first installation diagram of a supercooling device according to another embodiment of the present invention, Figure 26 FIG. 1 is a second installation diagram of a supercooling device according to another embodiment of the present invention. Figure 23-26As shown, in one embodiment of the present invention, the one-to-many heat recovery multi-split air-conditioning system 100 further includes a subcooling device 16, wherein the subcooling device 16 is connected to the second water tank branch, one end of the subcooling device 16 is connected to the other end of the water tank heat exchanger 21, the other end of the subcooling device 16 is connected to one end of the expansion valve group and one end of the outdoor expansion valve 3, and the subcooling device 16 is used to perform heat exchange with the refrigerant in the second water tank branch to heat the water entering the water tank 20; or, the subcooling device 16 is connected to the refrigerant circulation loop, one end of the subcooling device 16 is connected to one end of the expansion valve group and the other end of the water tank heat exchanger 21, the other end of the subcooling device 16 is connected to one end of the outdoor expansion valve 3, and the subcooling device 16 is used to perform heat exchange with the refrigerant in the refrigerant circulation loop to heat the water entering the water tank 20.

[0184] In a specific embodiment, Figure 23 and Figure 25 As shown, the supercooling device 16 is connected to the second water tank branch, one end of the supercooling device 16 is connected to the other end of the water tank heat exchanger 21, and the other end of the supercooling device 16 is connected to one end of the expansion valve group and one end of the outdoor expansion valve 3. The supercooling device 16 is used to exchange heat with the refrigerant in the second water tank branch to heat the water entering the water tank 20.

[0185] In a specific embodiment, Figure 24 and Figure 26 As shown, the subcooling device 16 is connected to the refrigerant circulation loop, one end of the subcooling device 16 is connected to one end of the expansion valve group and the other end of the water tank heat exchanger 21, and the other end of the subcooling device 16 is connected to one end of the outdoor expansion valve 3. The subcooling device 16 is used to exchange heat with the refrigerant in the refrigerant circulation loop to heat the water entering the water tank 20.

[0186] Specifically, the one-to-many heat recovery multi-split air-conditioning system 100 provided according to an embodiment of the present invention is further provided with a supercooling device 16 on the second water tank branch or the refrigerant circulation loop. The supercooling device 16 is used to perform heat exchange with the refrigerant in the second water tank branch or the refrigerant circulation loop to heat the water entering the water tank 20, thereby helping to improve the heat exchange efficiency and optimize the system operating performance.

[0187] Figure 27 FIG. 1 is a schematic diagram of a hot water system according to a specific embodiment of the present invention. Figure 27As shown, in a specific embodiment of the present invention, the hot water system 120 includes a water inlet, a water outlet and an exhaust valve, and a water inlet valve is provided on the water inlet; the hot water system 120 also includes a high-pressure sensor and a water level sensor, the high-pressure sensor is used to detect the pressure in the water tank 20, and the water level sensor is used to detect the water level in the water tank 20; the hot water system 120 also includes an electric heating device, which is used to use electrical energy to heat the water in the water tank 20.

[0188] In combination with the above, the one-to-many heat recovery multi-split air conditioning system 100 provided according to the embodiment of the present invention has the following beneficial effects:

[0189] First, the one-to-many heat recovery multi-split air-conditioning system 100 provided according to an embodiment of the present invention uses a water storage tank as a defrosting heat source. By transferring the heat in the water tank to the outdoor heat exchanger, it not only effectively speeds up the defrosting speed, but also significantly reduces the impact on the indoor temperature, ensuring the efficient operation and stability of the system in a low-temperature environment, thereby improving the overall operating performance and avoiding the negative impact of temperature fluctuations during the defrosting process on user comfort.

[0190] Secondly, the one-to-many heat recovery multi-split air-conditioning system 100 provided according to an embodiment of the present invention is different from conventional heat pump products in that a branch leading to the water tank is added in the pipeline from the compressor outlet to the four-way valve. This water tank branch is used as part of the condenser to heat the water in the water tank, thereby meeting the needs of air conditioning and hot water systems at the same time, and organically combining the cooling, heating and domestic hot water functions; in actual application, users no longer need to configure a separate gas water heater or electric water heater, thereby saving equipment investment and occupied space.

[0191] At the same time, the one-to-many heat recovery multi-split air-conditioning system 100 provided according to an embodiment of the present invention can effectively use the heat released indoors in cooling mode to heat the water in the water tank, thereby realizing simultaneous air-conditioning cooling and hot water preparation without the need for additional electric heating, thereby improving energy utilization efficiency and reducing energy consumption, helping users reduce operating costs.

[0192] Finally, the one-to-many heat recovery multi-split air-conditioning system 100 provided according to an embodiment of the present invention utilizes a capillary tube as a throttling device to efficiently recover the refrigerant retained in the branch that is not put into operation, thereby ensuring the full recycling of the refrigerant, thereby improving the system efficiency and preventing efficiency degradation or abnormal operation due to refrigerant retention.

[0193] In summary, the one-to-many heat recovery multi-split air-conditioning system 100 provided in an embodiment of the present invention includes an air-conditioning system 110, a hot water system 120 and a regulating unit 130 that are interconnected, and a controller 71. The water tank heat exchanger 21 in the hot water system 120 can be used as an evaporator. The controller 71 responds to the first control instruction to control the one-to-many heat recovery multi-split air-conditioning system 100 to operate in the defrost mode. In the defrost mode, the controller 71 controls the status of each component in the regulating unit 130 to control the disconnection between the refrigerant circulation loop and the water tank branch, and controls the outdoor heat exchanger 2 and the indoor heat exchanger in the refrigerant circulation loop. The internal heat exchanger groups are disconnected so that the water tank heat exchanger 21 in the hot water system 120 is used as an evaporator. The refrigerant in the water tank branch is heated by the water in the water tank 20. The heated refrigerant flows through the compressor 1 and exchanges heat with the outdoor heat exchanger 2 to defrost the outdoor heat exchanger 2, thereby transferring the heat in the water tank to the outdoor heat exchanger 2. This not only effectively speeds up the defrosting speed, but also significantly reduces the impact on the indoor temperature, ensuring the efficient operation and stability of the air-conditioning system 110 in a low-temperature environment, thereby improving the overall operating performance and avoiding the negative impact of temperature fluctuations during the defrosting process on user comfort.

[0194] 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.

[0195] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A one-to-many heat recovery multi-split air conditioning system, characterized in that: include: An air conditioning system, comprising: A refrigerant circulation loop, wherein the refrigerant circulates in a loop consisting of a compressor, an outdoor heat exchanger, an outdoor expansion valve, an expansion valve group, an indoor heat exchanger group, and a first four-way valve, wherein the indoor heat exchanger group includes a plurality of indoor heat exchangers connected in parallel; wherein the first interface of the first four-way valve is connected to the outlet of the compressor, the second interface of the first four-way valve is connected to the outdoor heat exchanger, the third interface of the first four-way valve is connected to the indoor heat exchanger group, and the fourth interface of the first four-way valve is connected to the inlet of the compressor; the expansion valve group includes: a plurality of first expansion valves connected in parallel, one end of each first expansion valve is connected to one end of the outdoor expansion valve, and the other end of each first expansion valve is connected to one end of the corresponding indoor heat exchanger; A hot water system connected to the air conditioning system, the hot water system comprising: water tank; a water tank heat exchanger, arranged in the water tank; The water tank branch, the water tank heat exchanger is connected to the refrigerant circulation loop through the water tank branch, the water tank branch includes: a first water tank branch and a second water tank branch; wherein, One end of the first water tank branch is connected to the outlet of the compressor, the other end of the first water tank branch is connected to one end of the water tank heat exchanger, one end of the second water tank branch is connected to the other end of the water tank heat exchanger, and the other end of the second water tank branch is connected to one end of the expansion valve group; When the water tank heat exchanger is used as an evaporator, the refrigerant in the water tank branch can be heated by the water in the water tank. The heated refrigerant flows through the compressor and then exchanges heat with the outdoor heat exchanger to defrost the outdoor heat exchanger. a regulating unit, connected to the refrigerant circulation loop and the water tank branch, respectively, and used to regulate the on-off state between the refrigerant circulation loop and the water tank branch, and to regulate the on-off state between the outdoor heat exchanger and the indoor heat exchanger group in the refrigerant circulation loop; A controller is connected to the air conditioning system and the regulating unit respectively, and the controller is configured to: In response to the first control instruction, the one-to-many heat recovery multi-split air-conditioning system is controlled to operate in a defrost mode, and in the defrost mode, the status of each component in the regulating unit is controlled, thereby controlling the disconnection between the refrigerant circulation loop and the water tank branch, and controlling the disconnection between the outdoor heat exchanger and the indoor heat exchanger group in the refrigerant circulation loop, so that the water tank heat exchanger is used as an evaporator, and the refrigerant in the water tank branch is heated by the water in the water tank. The heated refrigerant flows through the compressor and exchanges heat with the outdoor heat exchanger to defrost the outdoor heat exchanger.

2. The one-to-many heat recovery multi-split air conditioning system according to claim 1 is characterized in that: The regulating unit comprises: a first switch assembly, comprising: a gas shut-off valve, one end of the gas shut-off valve being connected to the outlet of the compressor, the other end of the gas shut-off valve being connected to the first interface, the gas shut-off valve being used to control the on / off state between the outlet of the compressor and the refrigerant circulation circuit; a second switch assembly, disposed on the first water tank branch, one end of the second switch assembly being connected to the outlet of the compressor, and the other end of the second switch assembly being connected to one end of the water tank heat exchanger, the second switch assembly being used to control the on / off state between the first water tank branch and the refrigerant circulation loop; a first throttling control component, one end of which is connected to the refrigerant circulation circuit, and the other end of which is connected to the inlet of the compressor and the fourth interface, and the first throttling control component is used to make the refrigerant in the outdoor heat exchanger and / or the indoor heat exchanger group reflux or not reflux to the compressor by its own on-off state; a flow regulating assembly disposed on the second water tank path, one end of the flow regulating assembly being connected to the other end of the water tank heat exchanger, and the other end of the flow regulating assembly being connected to one end of the expansion valve group and one end of the outdoor expansion valve, the flow regulating assembly being used to regulate the flow of refrigerant flowing out of the water tank heat exchanger; The third switch component includes: a liquid stop valve, one end of the liquid stop valve is connected to one end of the outdoor expansion valve, and the other end of the liquid stop valve is connected to one end of the expansion valve group and one end of the flow regulating component. The liquid stop valve is used to control the on-off state between the indoor heat exchanger group and the outdoor heat exchanger, and to control the on-end state between the second water tank branch and the outdoor heat exchanger.

3. The one-to-many heat recovery multi-split air conditioning system according to claim 2 is characterized in that: The adjustment unit further includes: A second throttling control component, one end of the second throttling control component is connected to the first water tank branch, the other end of the second throttling control component is connected to the inlet of the compressor and the fourth interface, and the second throttling control component is used to make the refrigerant in the water tank branch return or not return to the compressor through its own on-off state.

4. The one-to-many heat recovery multi-split air conditioning system according to claim 3 is characterized in that: The second switch assembly includes: A second four-way valve is provided on the first water tank branch, wherein the fifth interface of the second four-way valve is connected to the outlet of the compressor, the sixth interface of the second four-way valve is closed, the seventh interface of the second four-way valve is connected to one end of the water tank heat exchanger, and the eighth interface of the second four-way valve is connected to the inlet of the compressor.

5. The one-to-many heat recovery multi-split air conditioning system according to claim 4 is characterized in that: The second switch assembly further includes: A first solenoid valve is provided on the first water tank branch, wherein one end of the first solenoid valve is connected to the outlet of the compressor, and the other end of the first solenoid valve is connected to the fifth interface of the second four-way valve.

6. The one-to-many heat recovery multi-split air conditioning system according to claim 5, characterized in that: The first throttling control component includes: a first capillary and a second solenoid valve connected in series, wherein one end of the first capillary is connected to the other end of the gas shut-off valve and the first interface, the other end of the first capillary is connected to one end of the second solenoid valve, and the other end of the second solenoid valve is connected to the inlet of the compressor and the fourth interface.

7. The one-to-many heat recovery multi-split air conditioning system according to claim 6, characterized in that: The flow regulating component includes: a second expansion valve arranged on the second water tank branch, wherein one end of the second expansion valve is connected to the other end of the water tank heat exchanger, and the other end of the second expansion valve is connected to one end of the expansion valve group and one end of the outdoor expansion valve.

8. The one-to-many heat recovery multi-split air conditioning system according to claim 7, characterized in that: The second throttling control component includes: a second capillary tube and a third solenoid valve connected in series, wherein one end of the second capillary tube is connected to the first water tank branch, the other end of the second capillary tube is connected to one end of the third solenoid valve, and the other end of the third solenoid valve is connected to the inlet of the compressor and the fourth interface.

9. The one-to-many heat recovery multi-split air conditioning system according to claim 8, characterized in that: When, in response to the first control instruction, the one-to-many heat recovery multi-split air-conditioning system is controlled to operate in a defrost mode, the controller is configured to: When the regulating unit does not include the second throttling control component and the second switch component does not include the first solenoid valve, the first interface and the second interface of the first four-way valve are controlled to be connected, and the third interface and the fourth interface of the first four-way valve are controlled to be connected; the outdoor expansion valve is controlled to be fully opened; the plurality of first expansion valves are controlled to be closed; the gas stop valve is controlled to be fully opened; the liquid stop valve is controlled to be fully opened; the second expansion valve is controlled to be opened; the second solenoid valve is controlled to be closed; and the fifth interface and the sixth interface of the second four-way valve are controlled to be connected, and the seventh interface and the eighth interface of the second four-way valve are controlled to be connected; Or, when the regulating unit includes the second throttling control component and the second switch component includes the first solenoid valve, the first interface and the second interface of the first four-way valve are controlled to be connected, and the third interface and the fourth interface of the first four-way valve are controlled to be connected; the outdoor expansion valve is controlled to be fully opened; multiple first expansion valves are controlled to be closed; the gas stop valve is controlled to be fully opened; the liquid stop valve is controlled to be fully opened; the second expansion valve is controlled to be opened; the second solenoid valve is controlled to be closed; the fifth interface and the sixth interface of the second four-way valve are controlled to be connected, and the seventh interface and the eighth interface of the second four-way valve are controlled to be connected, and the first solenoid valve is controlled to be closed, and the third solenoid valve is controlled to be closed.

10. The one-to-many heat recovery multi-split air conditioning system according to claim 1, characterized in that: Also includes a supercooling device, wherein The subcooling device is connected to the second water tank branch, one end of the subcooling device is connected to the other end of the water tank heat exchanger, and the other end of the subcooling device is connected to one end of the expansion valve group and one end of the outdoor expansion valve. The subcooling device is used to perform heat exchange with the refrigerant in the second water tank branch to heat the water entering the water tank; or, The subcooling device is connected to the refrigerant circulation loop, one end of the subcooling device is connected to one end of the expansion valve group and the other end of the water tank heat exchanger, and the other end of the subcooling device is connected to one end of the outdoor expansion valve. The subcooling device is used to exchange heat with the refrigerant in the refrigerant circulation loop to heat the water entering the water tank.

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