Control method of heat pump system, heat pump system and storage medium

Abstract

The invention discloses a control method of a heat pump system, the heat pump system and a storage medium, and relates to the technical field of heat pump systems. An indoor heat exchange device in the heat pump system comprises a first heat exchange device and a second heat exchange device; the method comprises the steps that a reversing assembly is controlled to operate so that a first heat exchange device and a second heat exchange device can communicate with an exhaust port, an outdoor heat exchanger can communicate with an air return port, a throttling device is controlled to operate at a first throttling opening degree, and the first heat exchange device and the second heat exchange device are controlled to be started; under the condition that the starting condition corresponding to the first defrosting mode is met, the heat pump system is controlled to operate in the first defrosting mode, and a throttling device in the first defrosting mode operates at the first defrosting opening degree; wherein the first defrosting mode is set to defrost the outdoor heat exchanger, and the first defrosting opening degree is larger than the first throttling opening degree. The defrosting effect of the outdoor heat exchanger is guaranteed, and meanwhile the indoor thermal comfort in the defrosting process is improved.

Description

Technical Field

[0001] The present application relates to the technical field of heat pump systems, and in particular to a control method for a heat pump system, a heat pump system, and a storage medium. Background Art

[0002] When the heat pump system is running in a low-temperature environment for heating, the outdoor heat exchanger is prone to frost. At this time, the system needs to enter defrost operation to defrost the outdoor heat exchanger.

[0003] In the related art, a bypass branch is generally added to the heat pump system. When the outdoor heat exchanger needs to be defrosted, the bypass branch is opened to allow a portion of the refrigerant discharged from the compressor to flow directly into the outdoor heat exchanger to defrost the outdoor heat exchanger. However, this method is likely to cause insufficient indoor heating and cannot ensure indoor thermal comfort. Summary of the Invention

[0004] The main purpose of this application is to provide a control method for a heat pump system, a heat pump system and a storage medium, aiming to ensure the defrosting effect of an outdoor heat exchanger while improving indoor thermal comfort during the defrosting process.

[0005] To achieve the above objectives, the present application proposes a control method for a heat pump system, the heat pump system comprising a compressor, a reversing assembly, and an indoor heat exchange device, a throttling device, and an outdoor heat exchanger connected in sequence, wherein the exhaust port of the compressor, the return air port of the compressor, the indoor heat exchange device, and the outdoor heat exchanger are all connected to the reversing assembly, the indoor heat exchange device comprises a first heat exchange device and a second heat exchange device, the first heat exchange device and the second heat exchange device being connected to the reversing assembly respectively through different pipelines, and the control method for the heat pump system comprises:

[0006] Controlling the reversing assembly to operate so that both the first heat exchange device and the second heat exchange device are connected to the exhaust port, and the outdoor heat exchanger is connected to the return air port, controlling the throttling device to operate at a first throttling opening, and controlling both the first heat exchange device and the second heat exchange device to be open;

[0007] When a start-up condition corresponding to the first defrost mode is met, controlling the heat pump system to operate in the first defrost mode, wherein the throttling device operates at a first defrost opening degree in the first defrost mode;

[0008] The first defrost mode is set to defrost the outdoor heat exchanger, and the first defrost opening is greater than the first throttling opening.

[0009] In one embodiment, the step of controlling the heat pump system to operate in the first defrost mode further includes:

[0010] The compressor is controlled to reduce its frequency to the first defrosting frequency, and / or the outdoor fan corresponding to the outdoor heat exchanger is controlled to operate according to the outdoor ambient temperature of the environment where the heat pump system is located.

[0011] In one embodiment, the step of controlling the operation of the outdoor fan corresponding to the outdoor heat exchanger according to the outdoor ambient temperature includes:

[0012] When the outdoor ambient temperature is greater than or equal to a preset ambient temperature, controlling the outdoor fan to turn on;

[0013] When the outdoor ambient temperature is lower than the preset ambient temperature, the outdoor fan is controlled to be turned off.

[0014] In one embodiment, after the step of controlling the heat pump system to operate in the first defrost mode, the method further includes:

[0015] When the defrost time of the first defrost mode is greater than or equal to the first preset time and the temperature of the outdoor heat exchanger is lower than the preset heat exchanger temperature, the target heat exchange device in the first heat exchange device and the second heat exchange device is controlled to be closed, or the target heat exchange device in the first heat exchange device and the second heat exchange device is controlled to be closed and the reversing assembly is controlled to operate so that the return air port is connected to the target heat exchange device.

[0016] In one embodiment, when the defrost time of the first defrost mode is greater than or equal to a first preset time and the temperature of the outdoor heat exchanger is lower than a preset heat exchanger temperature, after the step of controlling a target heat exchange device among the first heat exchange device and the second heat exchange device to be closed, or controlling the target heat exchange device among the first heat exchange device and the second heat exchange device to be closed and controlling the reversing assembly to operate so that the return air port is connected to the target heat exchange device, the method further includes:

[0017] When the defrost time of the first defrost mode is greater than or equal to a second preset time and the temperature of the outdoor heat exchanger is lower than the preset heat exchanger temperature, controlling the heat pump system to operate in the second defrost mode;

[0018] Among them, the second preset time length is greater than the first preset time length, and in the second defrost mode, the reversing component operates so that the first heat exchange device and the second heat exchange device are both connected to the return air port and the outdoor heat exchanger is connected to the exhaust port, and the throttling device operates at a second throttling opening.

[0019] In one embodiment, the heat pump system includes at least two indoor heat exchange devices, and the step of controlling the heat pump system to operate in the second defrost mode further includes:

[0020] The first heat exchange device and the second heat exchange device in the indoor heat exchange device that is in the heating mode are controlled to be turned on, and / or the outdoor fan corresponding to the outdoor heat exchanger is controlled to be turned off.

[0021] In one embodiment, the reversing assembly includes a first assembly and a second assembly, the exhaust port, the return air port, the first heat exchange device, and the outdoor heat exchanger are all connected to the first assembly, and the first pipe between the exhaust port and the first assembly, the second pipe between the return air port and the first assembly, and the second heat exchange device are all connected to the second assembly;

[0022] The step of controlling the reversing assembly to operate so that both the first heat exchange device and the second heat exchange device are connected to the exhaust port, and the outdoor heat exchanger is connected to the return air port comprises: controlling the first assembly to operate so that the first pipeline is connected to the first heat exchange device and the second pipeline is connected to the outdoor heat exchanger, and controlling the second assembly to operate so that the first pipeline is connected to the second heat exchange device;

[0023] When the target heat exchange device is the second heat exchange device, the step of controlling the reversing component to operate so that the return air port is connected to the target heat exchange device includes: controlling the second component to operate so that the second pipeline is connected to the second heat exchange device; and / or when the target heat exchange device is the first heat exchange device, the step of controlling the reversing component to operate so that the return air port is connected to the target heat exchange device includes: controlling the first component to operate so that the second pipeline is connected to the first heat exchange device;

[0024] The step of controlling the heat pump system to operate in the second defrost mode includes: controlling the first component to operate so that the first pipeline is connected to the outdoor heat exchanger and the second pipeline is connected to the first heat exchange device, and controlling the second component to operate so that the second pipeline is connected to the second heat exchange device.

[0025] In one embodiment, after the step of controlling the heat pump system to operate in the first defrost mode, the method further includes:

[0026] When the temperature of the outdoor heat exchanger is greater than or equal to the preset heat exchanger temperature, the heat pump system is controlled to exit the first defrost mode.

[0027] In one embodiment, the first heat exchange device includes a first heat exchanger and a first expansion valve, the second heat exchange device includes a second heat exchanger and a second expansion valve, the first heat exchanger, the first expansion valve, and the throttling device are connected in sequence, and the second heat exchanger, the second expansion valve, and the throttling device are connected in sequence, and the step of controlling the first heat exchange device and the second heat exchange device to be both opened includes:

[0028] The first expansion valve and the second expansion valve are both controlled to open at a heating opening degree.

[0029] In one embodiment, the step of initiating the condition includes at least one of the following:

[0030] The temperature of the outdoor heat exchanger is less than or equal to a preset temperature threshold;

[0031] The temperature difference between the temperature of the outdoor heat exchanger and the temperature of the outdoor environment where the heat pump system is located is less than or equal to a preset temperature difference.

[0032] In addition, to achieve the above-mentioned purpose, the present application also proposes a heat pump system, which includes a control device, a compressor, a reversing assembly, and an indoor heat exchange device, a throttling device, and an outdoor heat exchanger connected in sequence, wherein the exhaust port of the compressor, the return air port of the compressor, the indoor heat exchange device, and the outdoor heat exchanger are all connected to the reversing assembly, and the indoor heat exchange device includes a first heat exchange device and a second heat exchange device, and the first heat exchange device and the second heat exchange device are respectively connected to the reversing assembly through different pipelines;

[0033] The compressor, the reversing assembly, the first heat exchange device, the second heat exchange device and the throttling device are all communicatively connected to the control device, and the control device includes: a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the control method of the heat pump system as described above.

[0034] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium, and stores a computer program on the storage medium. When the computer program is executed by the processor, the steps of the control method of the heat pump system as described above are implemented.

[0035] One or more technical solutions proposed in the present application have at least the following technical effects: based on a heat pump system with an increased number of heat exchange devices in the indoor heat exchange device, during the heating operation of the heat pump system, each heat exchange device in the indoor heat exchange device is in a heat release state. When the outdoor heat exchanger needs to be defrosted, the throttling device increases the opening to the first defrost opening, so that the temperature of the refrigerant flowing into the outdoor heat exchanger increases to achieve defrosting. Due to the increase in the number of heat exchange devices in the indoor heat exchange device, the heat of the refrigerant flowing into the outdoor heat exchanger can be increased to provide sufficient heat for defrosting the outdoor heat exchanger, and the system suction pressure can be increased, thereby effectively increasing the system high pressure and allowing more heat to flow into the indoor heat exchange device to provide indoor heating. Based on this, the defrosting effect of the outdoor heat exchanger can be ensured while reducing the indoor temperature fluctuation during the defrosting process, so as to effectively improve the indoor thermal comfort during the defrosting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0037] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0038] Figure 1 A schematic diagram of the system structure of an embodiment of the heat pump system of the present application and a schematic diagram of the refrigerant flow direction in a heating mode or a first defrosting mode;

[0039] Figure 2 A schematic diagram of the system structure of an embodiment of the heat pump system of the present application and a schematic diagram of the refrigerant flow direction in another state of the first defrost mode;

[0040] Figure 3 A schematic diagram of the system structure of an embodiment of the heat pump system of the present application and a schematic diagram of the refrigerant flow in the cooling mode or the second defrosting mode;

[0041] Figure 4 Schematic diagram of the equipment structure of the hardware operating environment involved in the control method of the heat pump system in the embodiment of the present application;

[0042] Figure 5 A flow chart of a first embodiment of a method for controlling a heat pump system according to the present invention;

[0043] Figure 6 A flow chart of the second embodiment of the control method for the heat pump system of the present application is provided.

[0044] The purpose, features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0045] It should be understood that the specific embodiments described herein are merely used to explain the technical solutions of the present application and are not intended to limit the present application.

[0046] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0047] The main solution of the embodiment of the present application is: a control method is proposed based on a heat pump system, the heat pump system includes a compressor, a reversing component and an indoor heat exchange device, a throttling device and an outdoor heat exchanger connected in sequence, the exhaust port of the compressor, the return air port of the compressor, the indoor heat exchange device and the outdoor heat exchanger are all connected to the reversing component, the indoor heat exchange device includes a first heat exchange device and a second heat exchange device, the first heat exchange device and the second heat exchange device are respectively connected to the reversing component through different pipelines, the control method of the heat pump system includes: controlling the reversing device The component is operated so that the first heat exchange device and the second heat exchange device are both connected to the exhaust port, and the outdoor heat exchanger is connected to the return air port, the throttling device is controlled to operate with a first throttling opening, and the first heat exchange device and the second heat exchange device are controlled to be turned on; when the starting conditions corresponding to the first defrost mode are met, the heat pump system is controlled to operate in the first defrost mode, and the throttling device in the first defrost mode operates with a first defrost opening; wherein, the first defrost mode is set to defrost the outdoor heat exchanger, and the first defrost opening is greater than the first throttling opening.

[0048] In this embodiment, for ease of description, the heat pump system is used as the execution subject for explanation below.

[0049] In the related art, a bypass branch is generally added to the heat pump system. When the outdoor heat exchanger needs to be defrosted, the bypass branch is opened to allow a portion of the refrigerant discharged from the compressor to flow directly into the outdoor heat exchanger to defrost the outdoor heat exchanger. However, this method can easily cause insufficient indoor heating supply and cannot ensure indoor thermal comfort.

[0050] The present application provides the above-mentioned solution, which is a heat pump system based on increasing the number of heat exchange devices in the indoor heat exchange device. During the heating operation of the heat pump system, each heat exchange device in the indoor heat exchange device is in a heat release state. When the outdoor heat exchanger needs to be defrosted, the throttling device increases the opening to the first defrost opening, so that the temperature of the refrigerant flowing into the outdoor heat exchanger increases to achieve defrosting. Due to the increase in the number of heat exchange devices in the indoor heat exchange device, the heat of the refrigerant flowing into the outdoor heat exchanger can be increased to provide sufficient heat for defrosting the outdoor heat exchanger, and the system suction pressure can be increased, thereby effectively increasing the system high pressure and allowing more heat to flow into the indoor heat exchange device for indoor heating. Based on this, the defrosting effect of the outdoor heat exchanger can be guaranteed while reducing the indoor temperature fluctuation during the defrosting process, so as to effectively improve the indoor thermal comfort during the defrosting process.

[0051] The present application provides a heat pump system, which may be a heat pump air conditioner or a heat pump water heater.

[0052] In this embodiment, referring to Figures 1 to 3 The heat pump system includes a compressor 1, a reversing assembly 7, and an indoor heat exchanger 2, a throttling device 3, and an outdoor heat exchanger 4 connected in sequence. Figures 1 to 3 The dotted line in the reversing component 7 indicates blocking, and the solid line in the reversing component 7 indicates conduction.

[0053] The exhaust port 11 of the compressor 1 , the return air port 12 of the compressor, the indoor heat exchange device 2 and the outdoor heat exchanger 4 are all connected to the reversing assembly 7 .

[0054] The indoor heat exchange device 2 includes a first heat exchange device 21 and a second heat exchange device 22. The first heat exchange device 21 and the second heat exchange device 22 are respectively connected to the reversing component 7 through different pipelines. The reversing component 7 can independently adjust the connection state of the first heat exchange device 21 and the connection state of the second heat exchange device 22, that is, the first heat exchange device 21 and the second heat exchange device 22 can be connected to the same position or different positions of the compressor 1 according to actual needs. The heat exchange state of the first heat exchange device 21 and the second heat exchange device 22 can be switched between the following states: both the first heat exchange device 21 and the second heat exchange device 22 are in an evaporating state, both the first heat exchange device 21 and the second heat exchange device 22 are in a condensing state, one of the first heat exchange device 21 and the second heat exchange device 22 is in an evaporating state and the other of the first heat exchange device 21 and the second heat exchange device 22 is in a condensing state.

[0055] In this embodiment, the first heat exchange device 21 includes a first heat exchanger 211 and a first expansion valve 212, the second heat exchange device 22 includes a second heat exchanger 221 and a second expansion valve 222, the first heat exchanger 211, the first expansion valve 212 and the throttling device 3 are connected in sequence, and the second heat exchanger 221, the second expansion valve 222 and the throttling device 3 are connected in sequence.

[0056] The heat exchange areas of the first heat exchanger 211 and the second heat exchanger 221 may be the same or different. For example, the heat exchange area of ​​the first heat exchanger 211 may be larger than the heat exchange area of ​​the second heat exchanger 221 .

[0057] The number of indoor heat exchange devices 2 can be one or more than one. The more than one indoor heat exchange devices 2 can be respectively arranged in different indoor spaces, and the first heat exchange device 21 and the second heat exchange device 22 are arranged in the same indoor space.

[0058] An outdoor fan 6 is provided corresponding to the outdoor heat exchanger 4 , and the outdoor fan 6 can drive the outdoor air to exchange heat with the outdoor heat exchanger 4 .

[0059] The exhaust port 11 of the compressor 1 , the return air port 12 of the compressor 1 , the first heat exchange device 21 , the second heat exchange device 22 and the outdoor heat exchanger 4 are all connected to the reversing assembly 7 .

[0060] The reversing assembly 7 can be used to adjust the connection states between the exhaust port 11 and the return air port 12 and the first heat exchange device 21, the second heat exchange device 22, and the outdoor heat exchanger 4, respectively. By adjusting the reversing assembly 7, the heat pump system can be switched between a first connection state, in which at least one of the first heat exchange device 21 and the second heat exchange device 22 is connected to the exhaust port 11 and the outdoor heat exchanger 4 is connected to the return air port 12, and a second connection state, in which at least one of the first heat exchange device 21 and the second heat exchange device 22 is connected to the return air port 12 and the outdoor heat exchanger 4 is connected to the exhaust port 11.

[0061] Under the regulation of the reversing assembly 7, the connection state of the first heat exchange device 21 can be switched between a first state and a second state, the connection state of the second heat exchange device 22 can be switched between a third state and a fourth state, and the connection state of the outdoor heat exchanger 4 can be switched between a fifth state and a sixth state. In the first state, the first heat exchange device 21 is in communication with the exhaust port 11, in the second state, the first heat exchange device 21 is in communication with the return air port 12, in the third state, the second heat exchange device 22 is in communication with the exhaust port 11, in the fourth state, the second heat exchange device 22 is in communication with the return air port 12, in the fifth state, the outdoor heat exchanger 4 is in communication with the exhaust port 11, and in the sixth state, the outdoor heat exchanger 4 is in communication with the return air port 12. Based on this, the above-mentioned first connection state may include the first heat exchange device 21 being in the first state, the second heat exchange device 22 being in the third state and the outdoor heat exchanger 4 being in the sixth state, or the first heat exchange device 21 being in the second state, the second heat exchange device 22 being in the third state and the outdoor heat exchanger 4 being in the sixth state, or the first heat exchange device 21 being in the first state, the second heat exchange device 22 being in the fourth state and the outdoor heat exchanger 4 being in the sixth state; the above-mentioned second connection state includes the first heat exchange device 21 being in the second state, the second heat exchange device 22 being in the fourth state and the outdoor heat exchanger 4 being in the fifth state, or the first heat exchange device 21 being in the second state, the second heat exchange device 22 being in the third state and the outdoor heat exchanger 4 being in the fifth state, or the first heat exchange device 21 being in the first state, the second heat exchange device 22 being in the fourth state and the outdoor heat exchanger 4 being in the fifth state.

[0062] Through the cooperation of the reversing assembly 7 and the throttling device 3, the heat pump system includes at least the following operating modes:

[0063] Heating mode (refrigerant flow direction is as follows Figure 1 As shown by the arrows, the first heat exchange device 21 and the second heat exchange device 22 are both connected to the exhaust port 11, the outdoor heat exchanger 4 is connected to the return air port 12, the throttling device 3 operates at a throttling opening, and the refrigerant discharged from the compressor 1 flows through the indoor heat exchange device 2, the throttling device 3 and the outdoor heat exchanger 4 in sequence and then flows back to the compressor 1. The first expansion valve 212 and the second expansion valve 222 are both in the open state, the first heat exchanger 211 and the second heat exchanger 221 are both in the condensing state, and the outdoor heat exchanger 4 is in the evaporating state.

[0064] Cooling mode (refrigerant flow direction is as follows Figure 3As shown by the arrows, the first heat exchanger 21 and the second heat exchanger 22 are both connected to the return air port 12, and the outdoor heat exchanger 4 is connected to the exhaust port 11. The throttling device 3 operates at a throttling opening. The refrigerant discharged from the compressor 1 flows through the outdoor heat exchanger 4, the throttling device 3 and the indoor heat exchanger 2 in sequence and then flows back to the compressor 1. The first expansion valve 212 and the second expansion valve 222 are both in the open state, the first heat exchanger 211 and the second heat exchanger 221 are both in the evaporating state, and the outdoor heat exchanger 4 is in the condensing state.

[0065] First defrost mode (refrigerant flow direction is as follows Figure 1 or Figure 2 (as indicated by the arrow in the middle), at least one of the first heat exchanger 21 and the second heat exchanger 22 is connected to the exhaust port 11, and the outdoor heat exchanger 4 is connected to the return air port 12. The throttling device 3 operates at a defrost opening, which is greater than the above-mentioned throttling opening. The refrigerant discharged from the compressor 1 flows through the indoor heat exchanger 2, the throttling device 3, and the outdoor heat exchanger 4 in sequence and then flows back to the compressor 1. At least one of the first expansion valve 212 and the second expansion valve 222 is in an open state. At least one of the first heat exchanger 211 and the second heat exchanger 22 is in a condensing state. The outdoor heat exchanger 4 is in a heat release state. The outdoor heat exchanger 4 uses the heat of the refrigerant condensed by the indoor heat exchanger 2 to defrost. Among them, when one of the first heat exchanger 21 and the second heat exchanger 22 is connected to the exhaust port 11, the defrost heat of the outdoor heat exchanger 4 is greater than the defrost heat of the outdoor heat exchanger 4 when both the first heat exchanger 21 and the second heat exchanger 22 are connected to the exhaust port 11.

[0066] Second defrost mode (refrigerant flow direction is as follows Figure 3 (as indicated by the arrows), the first heat exchanger 21 and the second heat exchanger 22 are both connected to the return air port 12, and the outdoor heat exchanger 4 is connected to the exhaust port 11. The throttling device 3 operates at a throttling opening. The refrigerant discharged from the compressor 1 flows through the outdoor heat exchanger 4, the throttling device 3, and the indoor heat exchanger 2 in sequence before returning to the compressor 1. The first expansion valve 212 and the second expansion valve 222 are both open. The first heat exchanger 211 and the second heat exchanger 221 are both in the evaporating state. The outdoor heat exchanger 4 is in the condensing state. The outdoor heat exchanger 4 uses the heat of the refrigerant discharged from the compressor 1 to perform defrost. The defrosting heat of the outdoor heat exchanger 4 in the second defrost mode is greater than the defrosting heat of the outdoor heat exchanger 4 in the first defrost mode.

[0067] In dehumidification and reheat mode, one of the first and second heat exchangers 21 and 22 is connected to the return air port 12, while the other is connected to the exhaust port 11. The throttling device 3 operates at a throttled opening. A portion of the refrigerant discharged from the compressor 1 flows through the outdoor heat exchanger 4, the throttling device 3, and one of the first and second heat exchangers 21 and 22 before returning to the return air port 12. The remaining portion of the refrigerant discharged from the compressor 1 flows through the other of the first and second heat exchangers 21 and 22, then merges with the refrigerant flowing out of the throttling device 3 and flows into one of the first and second heat exchangers 21 and 22 before returning to the return air port 12. The expansion valve in the heat exchanger connected to the exhaust port 11 operates in a throttling mode. One of the first and second heat exchangers 21 and 22 is in an evaporating state, dehumidifying the indoor air, while the other is in a condensing state, raising the temperature of the dehumidified indoor air.

[0068] In one possible embodiment, referring to Figures 1 to 3 The reversing component 7 includes a first component 71 and a second component 72. The exhaust port 11, the return air port 12, the first heat exchange device 21 and the outdoor heat exchanger 4 are all connected to the first component 71. The first pipeline 01 between the exhaust port 11 and the first component 71, the second pipeline 02 between the return air port 12 and the first component 71, and the second heat exchange device 22 are all connected to the second component 72.

[0069] The first component 71 has a first operating state and a second operating state. When the first component 71 operates in the first operating state, the first pipeline 01 is connected to the first heat exchange device 21 and the second pipeline 02 is connected to the outdoor heat exchanger 4; when the first component 71 operates in the second operating state, the first pipeline 01 is connected to the outdoor heat exchanger 4 and the second pipeline 02 is connected to the first heat exchange device 21.

[0070] In this embodiment, the first component 71 includes a four-way valve. In other embodiments, the first component 71 may also include more than one solenoid valve.

[0071] The second component 72 has a third operating state and a fourth operating state. When the second component 72 operates in the third operating state, the first pipeline 01 is connected to the second heat exchange device 22 and the second pipeline 02 is blocked from the second heat exchange device 22; when the second component 71 operates in the fourth operating state, the second pipeline 02 is connected to the second heat exchange device 22 and the first pipeline 01 is blocked from the second heat exchange device 22.

[0072] In this embodiment, the second component 72 includes a three-way valve or a four-way valve with one valve port blocked. In other embodiments, the second component 72 may also include more than one solenoid valve.

[0073] The coordination between the first component 71 and the second component 72 in each of the above operating modes is as follows:

[0074] In the heating mode, the first component 71 operates in the first operating state and the second component 72 operates in the third operating state;

[0075] In the cooling mode or the second defrosting mode, the first component 71 operates in the second operating state and the second component 72 operates in the fourth operating state;

[0076] In the first defrost mode, when the first heat exchange device 21 and the second heat exchange device 22 are both turned on, the first component 71 operates in the first operating state and the second component 72 operates in the third operating state; or, when the first heat exchange device 21 is turned on and the second heat exchange device 22 is turned off, the first component 71 operates in the first operating state and the second component 72 operates in the fourth operating state; or, when the first heat exchange device 21 is turned off and the second heat exchange device 22 is turned on, the first component 71 operates in the second operating state and the second component 72 operates in the third operating state;

[0077] In the dehumidification and reheating mode, the first component 71 operates in the first operating state and the second component 72 operates in the fourth operating state; or, the first component 71 operates in the second operating state and the second component 72 operates in the third operating state.

[0078] In this embodiment, the first component 71 and the second component 72 cooperate to switch the heat exchange states of the indoor heat exchange device 2 and the outdoor heat exchanger 4 according to different requirements of the heat pump system.

[0079] In other embodiments, the reversing component 7 may also be an integrated regulating component having the above-mentioned reversing function.

[0080] In one feasible embodiment, the heat pump system further includes an oil separator 8, and the exhaust port 11, the oil separator 8, and the reversing assembly 7 are sequentially connected. In this embodiment, the exhaust port 11, the oil separator 8, and the first assembly 71 are sequentially connected, and the first pipeline 01 is the pipeline between the oil separator 8 and the first assembly 71.

[0081] The oil separator 8 is connected to the air return port 12 through the oil return line 03.

[0082] The oil return line 03 is provided with an oil return capillary tube 031 .

[0083] In one feasible embodiment, the heat pump system further includes a gas-liquid separator 9, and the gas return port 12, the gas-liquid separator 9, and the reversing assembly 7 are sequentially connected. In this embodiment, the gas return port 12, the gas-liquid separator 9, and the first assembly 71 are sequentially connected. The second pipeline 02 is the pipeline between the gas-liquid separator 9 and the first assembly 71. The pipeline between the gas-liquid separator 9 and the gas return port 12 is connected to the oil separator 8 via the oil return pipeline 03.

[0084] In a feasible implementation, referring to Figure 4 The heat pump system further includes a detection device 200, which may include an environment detection module and / or a temperature sensor.

[0085] The environmental detection module is used to detect environmental parameters of the environment in which the heat pump system is located. Environmental parameters may include at least one of temperature, humidity, dew point temperature, and air enthalpy. The environmental detection module 200 may be located in the indoor environment regulated by the heat pump system and / or the outdoor environment corresponding to the heat pump system.

[0086] The temperature sensor is provided at the outdoor heat exchanger 4 to detect the temperature of the outdoor heat exchanger 4. For example, the temperature sensor can be provided at the refrigerant outlet of the outdoor heat exchanger 4.

[0087] Reference Figure 4 The heat pump system further includes a control device 100. The aforementioned compressor 1, outdoor fan 6, reversing assembly 7, indoor heat exchange device 2, throttling device 3, and detection device 200 are all in communication with the control device 100. The first heat exchange device 21 and the second heat exchange device 22 in the indoor heat exchange device 2 are also in communication with the control device 100.

[0088] The control device 100 includes: at least one processor 1001; and a memory 1002 connected to the at least one processor 1001 for communication, and a timer 1003, etc.; wherein the memory 1002 stores instructions that can be executed by the at least one processor 1001, and the instructions are executed by the at least one processor 1001 so that the at least one processor 1001 can execute the control method of the heat pump system in the following embodiment.

[0089] Reference below Figure 4, which shows a schematic structural diagram of a control device 100 suitable for implementing an embodiment of the present application. The control device 100 in the embodiment of the present application may include, but is not limited to, mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 4 The control device 100 shown is merely an example and should not limit the functions and scope of use of the embodiments of the present application.

[0090] like Figure 4 As shown, the control device 100 may include a processor 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes based on programs stored in memory 1002. The programs in memory 1002 may be programs in read-only memory (ROM) or programs loaded from a storage device into random access memory (RAM). The RAM also stores various programs and data required for the operation of the control device 100. The processor 1001 and memory 1002 (ROM and RAM) are connected to each other via a bus. An input / output (I / O) interface is also connected to the bus. Typically, the following systems can be connected to the I / O interface: input devices such as a touch screen, touchpad, keyboard, mouse, image sensor, microphone, accelerometer, gyroscope, etc.; output devices such as a liquid crystal display (LCD), speaker, vibrator, etc.; storage devices such as magnetic tape and hard disk; and communication devices. The communication devices can allow the control device 100 to communicate with other devices wirelessly or wired to exchange data. Although the control device 100 is shown with various systems, it should be understood that it is not required to implement or have all of the systems shown. More or fewer systems may be implemented or have alternatively.

[0091] In particular, according to the embodiments disclosed in this application, the method flow described in the following embodiments can be implemented as a computer software program. For example, the embodiments disclosed in this application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program contains program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network via a communication device, or installed from a storage device. When the computer program is executed by the processor 1001, the above-mentioned functions defined in the control method of the heat pump system in the embodiment disclosed in this application are performed.

[0092] The heat pump system provided in this application, utilizing the heat pump system control method described in the following embodiments, can address the technical problem of ensuring the defrosting effect of an outdoor heat exchanger while simultaneously improving indoor thermal comfort during the defrosting process. Compared to the prior art, the beneficial effects of the heat pump system provided in this application are the same as those of the heat pump system control method described in the following embodiments. Other technical features of this heat pump system are the same as those disclosed in the following embodiments and are not further detailed here.

[0093] It should be noted that the execution subject of this embodiment may be a computing service device with data processing, network communication, and program execution functions, such as a tablet computer, personal computer, mobile phone, etc., or an electronic device capable of implementing the above functions, a heat pump system, etc. The heat pump system is used as an example to illustrate this embodiment and the following embodiments.

[0094] Based on this, the embodiment of the present application provides a control method for a heat pump system, referring to Figure 5 , Figure 5 This is a flow chart of the first embodiment of the control method of the heat pump system of the present application.

[0095] In this embodiment, the heat pump system includes a compressor, a reversing assembly, and an indoor heat exchange device, a throttling device, and an outdoor heat exchanger connected in sequence. The exhaust port of the compressor, the return air port of the compressor, the indoor heat exchange device, and the outdoor heat exchanger are all connected to the reversing assembly. The indoor heat exchange device includes a first heat exchange device and a second heat exchange device. The first heat exchange device and the second heat exchange device are respectively connected to the reversing assembly through different pipelines. The control method of the heat pump system includes steps S10 to S20:

[0096] Step S10, controlling the reversing assembly to operate so that both the first heat exchange device and the second heat exchange device are connected to the exhaust port, and the outdoor heat exchanger is connected to the return air port, controlling the throttling device to operate at a first throttling opening, and controlling both the first heat exchange device and the second heat exchange device to be open;

[0097] During the execution of step S10, the heat pump system is in the above-mentioned heating mode, such as Figure 1 As shown in the refrigerant flow direction, the refrigerant discharged from the compressor flows through the indoor heat exchange device, the throttling device and the outdoor heat exchanger in sequence and then flows back to the compressor. The first heat exchange device and the second heat exchange device are both turned on, then the first heat exchange device and the second heat exchange device are both in a condensing state, and the outdoor heat exchanger is in an evaporating state.

[0098] The first throttling opening may be a fixed opening, or an opening determined according to the actual heating status of all powered-on heat exchange devices and / or the actual operating status of the system.

[0099] In this embodiment, the first heat exchange device includes the aforementioned first heat exchanger and first expansion valve, and the second heat exchange device includes the aforementioned second heat exchanger and second expansion valve. The step of controlling both the first and second heat exchange devices to be open includes controlling both the first and second expansion valves to be open at a heating opening degree. The heating opening degree can be determined based on, for example, the temperature difference between the actual temperature of the indoor space regulated by the heat exchange device where the corresponding expansion valve is located and the set temperature, to ensure that the heat amount of the refrigerant flowing into the heat exchanger connected to the expansion valve matches actual demand.

[0100] When the heat pump system includes more than one indoor heat exchanger, the first and second heat exchangers in the indoor heat exchangers with energy demand are both turned on and operated at a heating opening, while the first and second heat exchangers in the indoor heat exchangers without energy demand are both turned off, with the first expansion valve and the second expansion valve both operating at a standby opening or closed, where the standby opening is less than the heating opening and is a very small opening value. The indoor heat exchangers with energy demand include those in a heating mode and whose corresponding indoor space temperature has not reached a set temperature, while the indoor heat exchangers without energy demand include those in a heating mode and whose corresponding indoor space temperature has reached a set temperature, as well as those in a heating mode not turned on.

[0101] In this embodiment, the reversing assembly includes the aforementioned first and second assemblies, the exhaust port, the return air port, the first heat exchange device, and the outdoor heat exchanger are all connected to the first assembly, and the first pipe between the exhaust port and the first assembly, the second pipe between the return air port and the first assembly, and the second heat exchange device are all connected to the second assembly. Based on this, the step of controlling the reversing assembly to connect the first and second heat exchange devices to the exhaust port and the outdoor heat exchanger to the return air port includes: controlling the first assembly to connect the first pipe to the first heat exchange device and the second pipe to the outdoor heat exchanger, and controlling the second assembly to connect the first pipe to the second heat exchange device.

[0102] In this embodiment, when the operating time of the heating mode is greater than or equal to the set time, it is determined whether the starting condition corresponding to the first defrost mode is met.

[0103] Step S20, when the starting conditions corresponding to the first defrost mode are met, control the heat pump system to operate in the first defrost mode, and the throttling device in the first defrost mode operates at a first defrost opening; wherein, the first defrost mode is set to defrost the outdoor heat exchanger, and the first defrost opening is greater than the first throttling opening.

[0104] The startup conditions may include operating parameters of the heat pump system itself and / or environmental parameters of the environment in which the heat pump system is located. The startup conditions may include frosting on the outdoor heat exchanger, frost thickness on the outdoor heat exchanger greater than a first preset thickness (frosted), frost thickness on the outdoor heat exchanger greater than the first preset thickness and less than or equal to a second preset thickness (thinly frosted), etc.

[0105] In this embodiment, the startup condition step includes at least one of the following: the temperature of the outdoor heat exchanger is less than or equal to a preset temperature threshold; the temperature difference between the temperature of the outdoor heat exchanger and the temperature of the outdoor environment where the heat pump system is located is less than or equal to a preset temperature difference value. The preset temperature threshold is less than or equal to the freezing point. The temperature difference between the temperature of the outdoor heat exchanger and the temperature of the outdoor environment is calculated by subtracting the temperature of the outdoor environment from the temperature of the outdoor heat exchanger. When the temperature difference is less than or equal to the preset temperature difference value, the temperature of the outdoor heat exchanger is lower than the temperature of the outdoor environment. The preset temperature difference value is greater than 0°C (e.g., 8°C).

[0106] In this embodiment, the throttling device is in an unthrottled state when operating at the first defrost opening. Heat from the refrigerant condensed by the heat exchanger can be used to defrost the outdoor heat exchanger. When a reversing assembly is provided in the heat pump system, when the heating mode transitions to the first defrost mode, the reversing assembly does not need to be reversed, and the throttling device increases from the first throttling opening to the first defrost opening.

[0107] In this embodiment, the first defrost opening is greater than or equal to a preset defrost opening, and the preset defrost opening is [80%, 100%] of the maximum opening of the throttling device. In this embodiment, the first defrost opening is the maximum opening of the throttling device. In other embodiments, the first defrost opening may also be an opening smaller than the maximum opening.

[0108] When the activation conditions corresponding to the first defrost mode are met, at least one of the first expansion valve and the second expansion valve in the indoor heat exchange device with energy demand is in an open state. In this embodiment, at least one of the first expansion valve and the second expansion valve in the indoor heat exchange device with energy demand operates at a second defrost opening, which is greater than or equal to the heating opening. The first expansion valve and the second expansion valve in the indoor heat exchange device without energy demand both operate at a standby opening or are closed, and the standby opening is less than the throttling opening. When the first expansion valve and the second expansion valve operate at the second defrost opening, they are in an unthrottled state. For example, the second defrost opening is the maximum opening of the corresponding expansion valve. In other implementations, the second defrost opening may be a smaller opening than the maximum opening.

[0109] In the first defrost mode, if Figure 1 As shown in the refrigerant flow direction, the refrigerant discharged from the compressor flows through the indoor heat exchange device, the throttling device, and the outdoor heat exchanger in sequence and then flows back to the compressor. The outdoor heat exchanger uses the heat of the refrigerant after condensation in the indoor heat exchange device to defrost. Among them, the first heat exchange device and the second heat exchange device are maintained in the open state, and the refrigerant flowing out of the compressor flows through the first heat exchange device and the second heat exchange device respectively.

[0110] If the starting condition corresponding to the first defrost mode is not met, step S10 may be continued.

[0111] This embodiment provides a control method for a heat pump system, which is based on a heat pump system in which the number of heat exchange devices is increased in the indoor heat exchange device. During the heating operation of the heat pump system, each heat exchange device in the indoor heat exchange device is in a heat release state. When the outdoor heat exchanger needs to be defrosted, the throttling device increases the opening to the first defrost opening, so that the temperature of the refrigerant flowing into the outdoor heat exchanger increases to achieve defrosting. Due to the increase in the number of heat exchange devices in the indoor heat exchange device, the heat of the refrigerant flowing into the outdoor heat exchanger can be increased to provide sufficient heat for defrosting the outdoor heat exchanger, and the system suction pressure can be increased, thereby effectively increasing the system high pressure and allowing more heat to flow into the indoor heat exchange device to provide indoor heating. Based on this, the defrosting effect of the outdoor heat exchanger can be ensured while reducing the indoor temperature fluctuation during the defrosting process, so as to effectively improve the indoor thermal comfort during the defrosting process.

[0112] In a feasible implementation manner, the step of controlling the heat pump system to operate in the first defrost mode further includes:

[0113] The compressor is controlled to reduce its frequency to the first defrosting frequency, and / or the outdoor fan corresponding to the outdoor heat exchanger is controlled to operate according to the outdoor ambient temperature of the environment where the heat pump system is located.

[0114] The first defrost frequency is lower than the preset frequency, which is [30%, 50%] of the maximum frequency of the compressor. That is, the compressor is in a low-frequency operation state in the first defrost mode.

[0115] The first defrost frequency can be a pre-set fixed frequency, or a frequency determined based on the actual operating state of the heat pump system. For example, the first defrost frequency can be determined based on the suction state parameters of the compressor (e.g., at least one of the evaporation temperature corresponding to the suction pressure, the suction pressure, and the suction temperature) and / or the condensation temperature of the first heat exchange device and the condensation temperature of the second heat exchange device. In this embodiment, the first defrost frequency is positively correlated with the evaporation temperature corresponding to the suction pressure. For another example, the first defrost frequency can be obtained by reducing the heating frequency of the compressor before the first defrost mode is activated according to a preset frequency adjustment parameter.

[0116] The outdoor fan is turned on or off or its operating speed is adjusted according to the outdoor ambient temperature. The speed of the outdoor fan can be positively correlated with the ambient temperature, that is, the higher the ambient temperature, the higher the outdoor fan speed can be, and the lower the ambient temperature, the lower the outdoor fan speed can be. The outdoor fan speed can be as low as zero (that is, the outdoor fan is off).

[0117] In this embodiment, when the outdoor ambient temperature is greater than or equal to a preset ambient temperature, the outdoor fan is controlled to be turned on; when the outdoor ambient temperature is less than the preset ambient temperature, the outdoor fan is controlled to be turned off. The preset ambient temperature is greater than the freezing point (e.g., 2°C). The speed of the outdoor fan when it is turned on can be a preset fixed speed, or a speed determined based on the actual operating conditions of the heat pump system. For example, the outdoor fan can be controlled to maintain the current speed; for another example, the speed can be determined based on the actual conditions of the heat pump system. For example, the operating speed of the outdoor fan when it is turned on can be determined based on a first temperature difference between the outdoor ambient temperature and the preset ambient temperature and / or a first defrost opening of the throttling device and / or the temperature of the outdoor heat exchanger. Based on this, when the outdoor ambient temperature is sufficient, the outdoor fan is turned on to utilize the outdoor ambient heat to improve the defrost efficiency of the outdoor heat exchanger; when the outdoor ambient heat is insufficient, the outdoor fan is turned off to ensure the defrost effect of the outdoor heat exchanger while further improving the energy efficiency of the system.

[0118] In this embodiment, the first heat exchange device in the indoor heat exchange device may include a first fan corresponding to the first heat exchanger, and the second heat exchange device may include a second fan corresponding to the second heat exchanger. In the first defrost mode, the first fan in the activated first heat exchange device is in the on state, and the second fan in the activated second heat exchange device is in the on state. The defrost speeds of the first and second fans in the first defrost mode may be preset fixed speeds, or speeds determined based on the actual operating conditions of the heat pump system. For example, the defrost speed of the first fan may be adjusted based on the coil temperature of the first heat exchanger, and the defrost speed of the second fan may be adjusted based on the coil temperature of the second heat exchanger. For another example, the temperature difference between the coil temperature of the first heat exchanger and the coil temperature of the second heat exchanger may be determined, and the defrost speed of the first fan may be adjusted based on the temperature difference and the coil temperature of the first heat exchanger, and the defrost speed of the second fan may be adjusted based on the temperature difference and the coil temperature of the second heat exchanger. Based on this, both the indoor heating effect and the defrost effect of the outdoor heat exchanger can be ensured.

[0119] In this embodiment, through the above-mentioned method, it is possible to ensure that the various components of the heat pump system cooperate to achieve the defrosting effect of the outdoor heat exchanger in the first defrost mode while taking into account indoor comfort.

[0120] In other embodiments, the outdoor fan may also be kept off in the first defrost mode. The first defrost frequency of the compressor may also be increased or decreased according to the actual state of the heat pump system.

[0121] Based on any of the above embodiments, in the second embodiment of the present application, the same or similar contents as those in the above embodiments can be referred to the above introduction and will not be described in detail later. Figure 6 , after step S20, further comprising:

[0122] Step S30, determining whether the temperature of the outdoor heat exchanger is greater than or equal to a preset heat exchanger temperature;

[0123] If the temperature of the outdoor heat exchanger is greater than or equal to the preset heat exchanger temperature, step S40 is executed; if the temperature of the outdoor heat exchanger is less than the preset heat exchanger temperature, step S50 is executed;

[0124] The preset heat exchanger temperature is the critical temperature used to determine whether the outdoor heat exchanger has completed defrosting. The preset heat exchanger temperature is greater than the freezing point (for example, 15°C). When the outdoor heat exchanger temperature is greater than or equal to the preset heat exchanger temperature, defrosting is complete; when the outdoor heat exchanger temperature is less than the preset heat exchanger temperature, defrosting is incomplete.

[0125] Step S40, controlling the heat pump system to exit the first defrost mode;

[0126] After the heat pump system exits the first defrost mode, the heat pump system resumes operation in the heating mode.

[0127] Step S50, determining whether the defrost time of the first defrost mode is greater than or equal to a first preset time;

[0128] If the defrost time is greater than or equal to the first preset time, step S60 is executed; if the defrost time is less than the first preset time, step S30 is returned to be executed;

[0129] The first preset time is a critical time for distinguishing whether the current defrost heat of the outdoor heat exchanger is sufficient. If the defrost time of the first defrost mode is greater than or equal to the first preset time and the outdoor heat exchanger is not defrosted, it can be considered that the defrost heat is insufficient.

[0130] Step S60, controlling a target heat exchange device among the first heat exchange device and the second heat exchange device to be closed, or controlling a target heat exchange device among the first heat exchange device and the second heat exchange device to be closed and controlling the reversing assembly to operate so that the return air port is connected to the target heat exchange device;

[0131] The target heat exchange device may be a pre-set fixed device, for example, the second heat exchange device. Alternatively, the target heat exchange device may be determined based on the actual operating conditions of the heat pump system. For example, the target heat exchange device may be the heat exchange device where the higher temperature between the first and second heat exchangers is located.

[0132] When the target heat exchange device is turned off, the other heat exchange device among the first heat exchange device and the second heat exchange device other than the target heat exchange device remains turned on to maintain indoor heating.

[0133] When the target heat exchange device is the first heat exchange device, the first expansion valve can be controlled to close; when the target heat exchange device is the second heat exchange device, the second expansion valve can be controlled to close.

[0134] When the target heat exchange device is closed, the refrigerant is prohibited from flowing into the end of the target heat exchange device close to the throttling device, and the end of the target heat exchange device close to the return air port is connected to the second pipeline. Under the action of the pressure difference, the high-temperature refrigerant in the target heat exchange device can flow back from the second pipeline to the compressor to continue the refrigerant circulation, so as to effectively increase the heating amount of another heat exchange device other than the target heat exchange device in the first heat exchange device and the second heat exchange device and the defrost heat of the outdoor heat exchanger.

[0135] In this embodiment, the reversing component includes the above-mentioned first component and second component. When the target heat exchange device is the second heat exchange device, the second component is controlled to operate so that the second pipeline is connected to the second heat exchange device, and the first component maintains the current state of operation; when the target heat exchange device includes the first heat exchange device, the first component is controlled to operate so that the second pipeline is connected to the first heat exchange device, and the second component maintains the current state of operation.

[0136] When the target heat exchange device is the first heat exchange device and the first heat exchange device is closed, all the refrigerant flowing out of the compressor flows through the second heat exchange device, the throttling device, and the outdoor heat exchanger and then flows back to the compressor; when the target heat exchange device is the second heat exchange device and the second heat exchange device is closed, all the refrigerant flowing out of the compressor flows through the first heat exchange device, the throttling device, and the outdoor heat exchanger and then flows back to the compressor.

[0137] It should be noted that, in this embodiment, when the defrost time of the first defrost mode is less than or equal to the first preset time, the first heat exchange device and the second heat exchange device are both kept on, that is, both keep releasing heat to the room.

[0138] After step S60, the operating frequency of the compressor may be maintained at the first defrost frequency, or the compressor may increase the defrost frequency to ensure the defrosting effect of the outdoor heat exchanger and the indoor heating effect.

[0139] After step S60 is executed, the refrigerant flow direction of the heat pump system in the first defrost mode is as follows: Figure 2 shown.

[0140] After step S60, step S70 may be executed: determining whether the temperature of the outdoor heat exchanger is greater than or equal to a preset heat exchanger temperature;

[0141] If the temperature of the outdoor heat exchanger is greater than or equal to the preset heat exchanger temperature, step S40 is executed; if the temperature of the outdoor heat exchanger is less than the preset heat exchanger temperature, step S80 is executed;

[0142] Step S80, determining whether the defrost time of the first defrost mode is greater than or equal to a second preset time, wherein the second preset time is greater than the first preset time;

[0143] When the defrost time is greater than or equal to the second preset time, step S90 is executed; when the defrost time is less than the second preset time, step S70 is returned to be executed.

[0144] The second preset duration is a threshold value for determining whether the first defrost mode has sufficient heat to defrost the outdoor heat exchanger. If the defrost duration of the first defrost mode is greater than or equal to the second preset duration and the outdoor heat exchanger is not defrosted, it can be considered that the defrost heat of the first defrost mode is insufficient to defrost the outdoor heat exchanger.

[0145] The first preset time length and the second preset time length may be pre-set time lengths, or time lengths determined according to actual operation of the heat pump system. For example, the first preset time length and the second preset time length may be determined according to the outdoor ambient temperature.

[0146] During the execution of steps S60 to S80 , the heat pump system is still in the first defrost mode.

[0147] Step S90, controlling the heat pump system to operate in a second defrost mode, wherein the reversing assembly operates in the second defrost mode so that the first heat exchange device and the second heat exchange device are both connected to the return air port and the outdoor heat exchanger is connected to the exhaust port, and the throttling device operates at a second throttling opening.

[0148] In the second defrost mode, the indoor heat exchanger is in an evaporating state, the outdoor heat exchanger is in a condensing state, the compressor operates at a second defrost frequency (the second defrost frequency may be less than or equal to the heating frequency of the compressor in the heating mode), the outdoor fan corresponding to the outdoor heat exchanger is turned off, and the fan in the indoor heat exchanger is turned off.

[0149] In this embodiment, the heat pump system includes at least two indoor heat exchange devices. In order to improve the defrosting effect of the outdoor heat exchanger, in the second defrost mode, the first heat exchange device and the second heat exchange device in the indoor heat exchange device in the heating mode can also be controlled to be turned on (for example, the first expansion valve and the second expansion valve are both opened at the third defrost opening, etc.). Here, the indoor heat exchange device in the heating mode can include an indoor heat exchange device with energy demand or an indoor heat exchange device without energy demand and in a standby state. In some other implementations, in the second defrost mode, the first heat exchange device and the second heat exchange device in the indoor heat exchange device with energy demand can also be controlled to be turned on, and the first heat exchange device and the second heat exchange device in the indoor heat exchange device without energy demand can be controlled to be turned off.

[0150] In this embodiment, when the reversing component includes the above-mentioned first component and second component, the step of controlling the heat pump system to operate the second defrost mode includes: controlling the first component to operate so that the first pipeline is connected to the outdoor heat exchanger and the second pipeline is connected to the first heat exchange device, and controlling the second component to operate so that the second pipeline is connected to the second heat exchange device.

[0151] In this embodiment, in the initial stage of the first defrost mode, both the first heat exchange device and the second heat exchange device maintain a heat release state to effectively ensure indoor comfort during the defrost process; when the defrost time reaches the first preset time and the defrost is not completed, it indicates that the defrosting heat of the outdoor heat exchanger is insufficient, and part of the heat exchange devices in the indoor heat exchange device are shut down to reduce the heat dissipation of the refrigerant in the indoor heat exchange device, and more heat is used for defrosting of the outdoor heat exchanger to ensure indoor thermal comfort while effectively improving the defrosting effect of the outdoor heat exchanger; thereafter, when the defrost time reaches the second preset time and the defrost is not completed, it indicates that the first defrost mode cannot effectively defrost the outdoor heat exchanger. At this time, the refrigerant flow direction is switched by the reversing component to switch the outdoor heat exchanger to a condensing state for defrosting, thereby further ensuring the defrosting effect of the outdoor heat exchanger.

[0152] In other embodiments, the target heat exchange device may remain in communication with the exhaust port of the compressor when it is closed.

[0153] In other embodiments, when the defrost time of the first defrost mode is greater than or equal to the second preset time and the temperature of the outdoor heat exchanger is lower than the preset heat exchanger temperature, the electric auxiliary heating device in the environment where the outdoor heat exchanger is located can also be controlled to turn on to defrost the outdoor heat exchanger.

[0154] In other embodiments, one of the first heat exchange device and the second heat exchange device can be controlled to close (that is, one of the first expansion valve and the second control valve can be closed) when the first defrost mode is less than or equal to the first preset time length (for example, when entering the first defrost mode).

[0155] In other embodiments, when the defrost time in the first defrost mode is greater than or equal to the second preset time, the heat pump system may be controlled to exit the first defrost mode and resume operation in the heating mode.

[0156] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the control method of the heat pump system of the present application. More simple transformations based on this technical concept are all within the scope of protection of the present application.

[0157] The present application provides a computer-readable storage medium having computer-readable program instructions (ie, a computer program) stored thereon, wherein the computer-readable program instructions are used to execute the control method of the heat pump system in the above-mentioned embodiment.

[0158] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems or devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0159] The computer-readable storage medium may be included in the heat pump system, or may exist independently without being assembled into the heat pump system.

[0160] The computer-readable storage medium carries one or more programs. When the one or more programs are executed by the processor, the processor executes the process in the embodiment of the control method of the heat pump system.

[0161] Computer program code for performing the operations of the present application may be written in one or more programming languages, or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0162] The computer-readable storage medium provided in this application stores computer-readable program instructions (i.e., a computer program) for executing the aforementioned heat pump system control method. This computer-readable storage medium addresses the technical problem of ensuring effective defrosting of an outdoor heat exchanger while simultaneously improving indoor thermal comfort during the defrosting process. Compared to the prior art, the beneficial effects of the computer-readable storage medium provided in this application are similar to those of the heat pump system control method provided in the aforementioned embodiments and are not further elaborated here.

[0163] The flow charts and block diagrams in the accompanying drawings illustrate the possible architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present application. In this regard, each box in the flow chart or block diagram can represent a module, program segment or a part of code, and the module, program segment or a part of code includes one or more executable instructions for realizing the prescribed logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a sequence different from that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flow chart, and the combination of the boxes in the block diagram and / or flow chart can be implemented using a dedicated hardware-based system that performs the prescribed function or operation, or can be implemented using a combination of dedicated hardware and computer instructions.

[0164] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. The modules described in the embodiments of this application can be implemented using software or hardware. The name of a module does not, in some cases, constitute a limitation on the unit itself. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any appropriate manner in any one or more embodiments or examples.

[0165] The above descriptions are merely some embodiments of the present application and are not intended to limit the scope of the present application. Any equivalent structural transformations made within the technical concept of the present application using the contents of the present specification and drawings, or any direct or indirect application in other related technical fields, are included within the scope of the present application. Therefore, the scope of protection of the present application shall be based on the scope of protection of the claims.

Claims

1. A control method for a heat pump system, characterized in that: The heat pump system includes a compressor, a reversing assembly, and an indoor heat exchange device, a throttling device, and an outdoor heat exchanger connected in sequence. The exhaust port of the compressor, the return air port of the compressor, the indoor heat exchange device, and the outdoor heat exchanger are all connected to the reversing assembly. The indoor heat exchange device includes a first heat exchange device and a second heat exchange device. The first heat exchange device and the second heat exchange device are respectively connected to the reversing assembly through different pipelines. The control method of the heat pump system includes: Controlling the reversing assembly to operate so that both the first heat exchange device and the second heat exchange device are connected to the exhaust port, and the outdoor heat exchanger is connected to the return air port, controlling the throttling device to operate at a first throttling opening, and controlling both the first heat exchange device and the second heat exchange device to be open; When a start-up condition corresponding to the first defrost mode is met, controlling the heat pump system to operate in the first defrost mode, wherein the throttling device operates at a first defrost opening degree in the first defrost mode; The first defrost mode is configured to defrost the outdoor heat exchanger, and the first defrost opening is greater than the first throttling opening.

2. The control method of the heat pump system according to claim 1, characterized in that: The step of controlling the heat pump system to operate in the first defrost mode further includes: The compressor is controlled to reduce its frequency to the first defrosting frequency, and / or the outdoor fan corresponding to the outdoor heat exchanger is controlled to operate according to the outdoor ambient temperature of the environment where the heat pump system is located.

3. The control method of the heat pump system according to claim 2, wherein: The step of controlling the operation of the outdoor fan corresponding to the outdoor heat exchanger according to the outdoor ambient temperature includes: When the outdoor ambient temperature is greater than or equal to a preset ambient temperature, controlling the outdoor fan to turn on; When the outdoor ambient temperature is lower than the preset ambient temperature, the outdoor fan is controlled to be turned off.

4. The control method of the heat pump system according to claim 1, wherein: After the step of controlling the heat pump system to operate in the first defrost mode, the method further includes: When the defrost time of the first defrost mode is greater than or equal to the first preset time and the temperature of the outdoor heat exchanger is lower than the preset heat exchanger temperature, the target heat exchange device in the first heat exchange device and the second heat exchange device is controlled to be closed, or the target heat exchange device in the first heat exchange device and the second heat exchange device is controlled to be closed and the reversing assembly is controlled to operate so that the return air port is connected to the target heat exchange device.

5. The control method of the heat pump system according to claim 4, characterized in that: After the step of controlling a target heat exchange device among the first heat exchange device and the second heat exchange device to be closed when the defrost time of the first defrost mode is greater than or equal to a first preset time and the temperature of the outdoor heat exchanger is less than a preset heat exchanger temperature, or controlling the target heat exchange device among the first heat exchange device and the second heat exchange device to be closed and controlling the reversing assembly to operate so that the return air port is connected to the target heat exchange device, the method further includes: When the defrost time of the first defrost mode is greater than or equal to a second preset time and the temperature of the outdoor heat exchanger is lower than the preset heat exchanger temperature, controlling the heat pump system to operate in the second defrost mode; Among them, the second preset time length is greater than the first preset time length, and in the second defrost mode, the reversing component operates so that the first heat exchange device and the second heat exchange device are both connected to the return air port and the outdoor heat exchanger is connected to the exhaust port, and the throttling device operates at a second throttling opening.

6. The control method of the heat pump system according to claim 5, characterized in that: The heat pump system includes at least two indoor heat exchange devices, and the step of controlling the heat pump system to operate in the second defrost mode further includes: The first heat exchange device and the second heat exchange device in the indoor heat exchange device that is in the heating mode are controlled to be turned on, and / or the outdoor fan corresponding to the outdoor heat exchanger is controlled to be turned off.

7. The control method of the heat pump system according to claim 5, characterized in that: The reversing assembly includes a first assembly and a second assembly, the exhaust port, the return air port, the first heat exchange device and the outdoor heat exchanger are all connected to the first assembly, the first pipe between the exhaust port and the first assembly, the second pipe between the return air port and the first assembly, and the second heat exchange device are all connected to the second assembly; The step of controlling the reversing assembly to operate so that both the first heat exchange device and the second heat exchange device are connected to the exhaust port, and the outdoor heat exchanger is connected to the return air port comprises: controlling the first assembly to operate so that the first pipeline is connected to the first heat exchange device and the second pipeline is connected to the outdoor heat exchanger, and controlling the second assembly to operate so that the first pipeline is connected to the second heat exchange device; When the target heat exchange device is the second heat exchange device, the step of controlling the reversing component to operate so that the return air port is connected to the target heat exchange device includes: controlling the second component to operate so that the second pipeline is connected to the second heat exchange device; and / or when the target heat exchange device is the first heat exchange device, the step of controlling the reversing component to operate so that the return air port is connected to the target heat exchange device includes: controlling the first component to operate so that the second pipeline is connected to the first heat exchange device; The step of controlling the heat pump system to operate in the second defrost mode includes: controlling the first component to operate so that the first pipeline is connected to the outdoor heat exchanger and the second pipeline is connected to the first heat exchange device, and controlling the second component to operate so that the second pipeline is connected to the second heat exchange device.

8. The control method of the heat pump system according to claim 4, wherein: After the step of controlling the heat pump system to operate in the first defrost mode, the method further includes: When the temperature of the outdoor heat exchanger is greater than or equal to the preset heat exchanger temperature, the heat pump system is controlled to exit the first defrost mode.

9. The control method of a heat pump system according to any one of claims 1 to 8, characterized in that: The first heat exchange device includes a first heat exchanger and a first expansion valve, the second heat exchange device includes a second heat exchanger and a second expansion valve, the first heat exchanger, the first expansion valve, and the throttling device are connected in sequence, and the second heat exchanger, the second expansion valve, and the throttling device are connected in sequence, and the step of controlling the first heat exchange device and the second heat exchange device to be opened includes: The first expansion valve and the second expansion valve are both controlled to open at a heating opening degree.

10. The control method of a heat pump system according to any one of claims 1 to 8, characterized in that: The steps of the startup conditions include at least one of the following: The temperature of the outdoor heat exchanger is less than or equal to a preset temperature threshold; The temperature difference between the temperature of the outdoor heat exchanger and the temperature of the outdoor environment where the heat pump system is located is less than or equal to a preset temperature difference.

11. A heat pump system, characterized in that: The heat pump system includes a control device, a compressor, a reversing assembly, and an indoor heat exchange device, a throttling device, and an outdoor heat exchanger connected in sequence. The exhaust port of the compressor, the return air port of the compressor, the indoor heat exchange device, and the outdoor heat exchanger are all connected to the reversing assembly. The indoor heat exchange device includes a first heat exchange device and a second heat exchange device. The first heat exchange device and the second heat exchange device are respectively connected to the reversing assembly through different pipelines. The compressor, the reversing assembly, the first heat exchange device, the second heat exchange device and the throttling device are all communicatively connected to the control device, and the control device includes: a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the control method for the heat pump system according to any one of claims 1 to 10.

12. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the control method of the heat pump system according to any one of claims 1 to 10 are implemented.

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