Heat pump unit, heat pump unit control method, storage medium and electronic device

Abstract

This application discloses a heat pump unit, a heat pump unit control method, a storage medium, and electronic equipment, relating to the field of heat pump technology. In the heat pump unit, the exhaust end of the compressor is connected to the first end of a four-way valve, and the second end of the four-way valve is connected to the indoor heat exchanger through a first pipe passing through the heat accumulator. The outdoor heat exchanger is connected to the third end of the four-way valve, and the fourth end of the four-way valve is connected to the suction end of the compressor through a second and a third pipe connected in parallel. A first expansion valve is installed on the second pipe and is connected to the heat exchange pipe inside the heat accumulator. A first two-way valve is installed on the third pipe. In defrost mode, the first expansion valve is open and the first two-way valve is closed. In both defrost and heating modes, the first and second ends are connected, and the third and fourth ends are connected. The overall system structure and control method of the heat pump unit of this application are simple, which can improve the heat storage effect during heating operation and improve defrost efficiency and defrost effect.

Description

Technical Field

[0001] This application relates to the field of heat pump technology, specifically to a heat pump unit, a heat pump unit control method, a storage medium, and electronic equipment. Background Technology

[0002] Taking heat pump air conditioners as an example, heat pump units require defrosting under low-temperature heating conditions. Some related technologies have solutions for defrosting using sensible heat and heat storage. However, the overall system structure is complex and the control is complicated. Furthermore, the heat storage effect is poor because the refrigerant introduced after the indoor heat exchanger is used for heat storage. The poor heat storage effect and the inability of the heat pump unit system to establish a good high-low pressure difference during defrosting result in weak defrosting efficiency and effect. Summary of the Invention

[0003] This application provides a heat pump unit with a simple overall system structure and control method. It can improve the heat storage effect of the heat pump unit during heating operation and further improve the defrosting efficiency and defrosting effect.

[0004] The embodiments of this application provide the following technical solutions: According to one embodiment of this application, a heat pump unit includes a compressor, an indoor heat exchanger, an outdoor heat exchanger, a four-way valve, a heat accumulator, a first expansion valve, and a first two-way valve. The discharge end of the compressor is connected to the first end of the four-way valve, and the second end of the four-way valve is connected to the indoor heat exchanger through a first pipe, and the first pipe passes through the heat accumulator. The indoor heat exchanger is connected to the outdoor heat exchanger, the outdoor heat exchanger is connected to the third end of the four-way valve, and the fourth end of the four-way valve is connected to the suction end of the compressor through the second and third pipes connected in parallel; the first expansion valve is installed on the second pipe and is connected to the heat exchange pipe inside the heat accumulator; the first two-way valve is installed on the third pipe. In heating mode, the first two-way valve is open and the first expansion valve is closed; in defrost mode, the first expansion valve is open and the first two-way valve is closed; in both defrost mode and heating mode, the first end and the second end are connected, and the third end and the fourth end are connected.

[0005] In some embodiments of this application, the indoor heat exchanger and the outdoor heat exchanger are connected through a fourth pipe, and a second expansion valve is provided on the fourth pipe; the heat pump unit further includes a fifth pipe connected in parallel with the fourth pipe, and a second two-way valve is provided on the fifth pipe; in the heating mode, the second expansion valve is open and the second two-way valve is closed; in the defrosting mode, the second expansion valve is closed and the second two-way valve is open.

[0006] In some embodiments of this application, the first port of the fifth pipe is connected to the refrigerant outlet of the indoor heat exchanger; the second port of the fifth pipe is connected to the refrigerant inlet of the outdoor heat exchanger.

[0007] In some embodiments of this application, the first port of the fifth pipe is connected to the refrigerant inlet of the indoor heat exchanger; the second port of the fifth pipe is connected to the first pipe.

[0008] According to one embodiment of this application, a heat pump unit control method is provided. The heat pump unit includes a compressor, an indoor heat exchanger, an outdoor heat exchanger, a four-way valve, a heat accumulator, a first expansion valve, and a first two-way valve. The discharge end of the compressor is connected to the first end of the four-way valve, and the second end of the four-way valve is connected to the indoor heat exchanger through a first pipe, which passes through the heat accumulator. The indoor heat exchanger is connected to the outdoor heat exchanger, and the outdoor heat exchanger is connected to the third end of the four-way valve. The fourth end of the four-way valve is connected to the suction end of the compressor through a second pipe and a third pipe connected in parallel. The first expansion valve is installed on the second pipe and is connected to a heat exchange pipe inside the heat accumulator. The first two-way valve is installed on the third pipe. The method includes: when entering a heating mode, controlling the first two-way valve to open and the first expansion valve to close, and controlling the first end and the second end of the four-way valve to connect, and the third end and the fourth end to connect; when switching from the heating mode to a defrost mode, controlling the first two-way valve to close and the first expansion valve to open.

[0009] In some embodiments of this application, the indoor heat exchanger and the outdoor heat exchanger are connected through a fourth pipe, and a second expansion valve is provided on the fourth pipe; the heat pump unit further includes a fifth pipe connected in parallel with the fourth pipe, and a second two-way valve is provided on the fifth pipe; in the heating mode, the method further includes: controlling the second expansion valve to open and the second two-way valve to close; when switching from the heating mode to the defrosting mode, the method further includes: controlling the second expansion valve to close and the second two-way valve to open.

[0010] In some embodiments of this application, when switching from the heating mode to the defrosting mode, the method further includes: determining a target compressor frequency based on the outdoor ambient temperature and the outdoor coil temperature of the outdoor heat exchanger; and controlling the compressor to operate at the target compressor frequency.

[0011] In some embodiments of this application, after controlling the first two-way valve to close and the first expansion valve to open, the method further includes: when it is determined that the defrosting end condition is met, controlling the first two-way valve to open and the first expansion valve to close.

[0012] According to another embodiment of this application, a storage medium stores a computer program thereon, which, when executed by a processor of an electronic device, causes the electronic device to perform the methods described in the embodiments of this application.

[0013] According to another embodiment of this application, an electronic device may include: a memory storing a computer program; and a processor reading the computer program stored in the memory to execute the methods described in the embodiments of this application.

[0014] According to another embodiment of this application, a computer program product or computer program includes computer instructions stored in a computer-readable storage medium. A processor of an electronic device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the electronic device to perform the methods provided in the various optional implementations described in the embodiments of this application.

[0015] In this embodiment, the heat pump unit includes a compressor, an indoor heat exchanger, an outdoor heat exchanger, a four-way valve, a heat accumulator, a first expansion valve, and a first two-way valve. The discharge end of the compressor is connected to the first end of the four-way valve, and the second end of the four-way valve is connected to the indoor heat exchanger through a first pipe, which passes through the heat accumulator. The indoor heat exchanger is connected to the outdoor heat exchanger, and the outdoor heat exchanger is connected to the third end of the four-way valve. The fourth end of the four-way valve is connected to the suction end of the compressor through a second pipe and a third pipe connected in parallel. The first expansion valve is installed on the second pipe and is connected to the heat exchange pipe inside the heat accumulator. The first two-way valve is installed on the third pipe. In heating mode, the first two-way valve is open and the first expansion valve is closed. In defrost mode, the first expansion valve is open and the first two-way valve is closed. In both defrost and heating modes, the first and second ends are connected, and the third and fourth ends are connected.

[0016] In this embodiment of the application, a second pipe is simply added to the heat pump unit in parallel with the third pipe, and the first pipe passes through the heat accumulator. The second pipe is equipped with a first expansion valve and is connected to the heat exchange pipe inside the heat accumulator. The high-temperature and high-pressure refrigerant before entering the indoor heat exchanger can store heat in the heat accumulator, thereby improving the heat storage effect of the heat pump unit during heating operation. Moreover, the electronic expansion valve and the two-way valve can be easily controlled to form a new heat exchange system without stopping the heat pump unit or reversing the four-way valve. This effectively establishes a high and low pressure difference, and simultaneously utilizes the heat of the heat storage material and the work of the compressor to efficiently and effectively defrost the outdoor heat exchanger. The overall system structure and control method are simple, and the defrosting efficiency and defrosting effect are improved. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the system structure of a heat pump unit according to an embodiment of this application is shown.

[0019] Figure 2 A schematic diagram of the system structure of a heat pump unit according to another embodiment of this application is shown.

[0020] Figure 3 A schematic diagram of the system structure of a heat pump unit according to another embodiment of this application is shown.

[0021] Figure 4 A control flowchart of a heat pump unit according to an embodiment of this application is shown.

[0022] Figure 5 A block diagram of an electronic device according to an embodiment of this application is shown. Detailed Implementation

[0023] The present disclosure will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the embodiments provided herein are merely illustrative of the present disclosure and are not intended to limit the present disclosure. Furthermore, the embodiments provided below are some embodiments for implementing the present disclosure, and not all embodiments for implementing the present disclosure. Unless otherwise specified, the technical solutions described in the embodiments of the present disclosure can be implemented in any combination. It should be noted that, in the embodiments of this disclosure, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a method or apparatus that includes a list of elements includes not only the elements expressly described, but also other elements not expressly listed, or elements inherent to implementing the method or apparatus. Without further limitations, an element defined by the phrase "comprising a..." does not exclude the presence of other related elements (e.g., steps in the method or units in the apparatus; for example, a unit may be a portion of circuitry, a portion of a processor, a portion of a program or software, etc.) in the method or apparatus that includes that element. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. It is understood that in the specific implementation of this application, relevant data is involved. When the embodiments in this application are applied to specific products or technologies, user permission or consent is required, and the collection, use and processing of relevant data must comply with the relevant laws, regulations and standards of the relevant countries and regions.

[0024] Taking heat pump air conditioners as an example, heat pump units require defrosting under low-temperature heating conditions. Some related technologies have solutions for defrosting using sensible heat and heat storage. However, the overall system structure is complex and the control is complicated. Furthermore, the heat storage effect is poor because the refrigerant introduced after the indoor heat exchanger is used for heat storage. The poor heat storage effect and the inability of the heat pump unit system to establish a good high-low pressure difference during defrosting result in weak defrosting efficiency and effect.

[0025] To address these issues, this application provides a heat pump unit with a simple overall system structure and control method. It can improve the heat storage effect of the heat pump unit during heating operation and further enhance defrosting efficiency and effect.

[0026] The following is a detailed description of relevant embodiments of the heat pump unit and its control scheme provided in this application.

[0027] Figure 1 A schematic diagram illustrating the system structure of a heat pump unit according to an embodiment of this application is provided. See also... Figure 1 The heat pump unit may include a compressor 110, an indoor heat exchanger 120, an outdoor heat exchanger 130, a four-way valve 140, a heat accumulator 150, a first expansion valve 160, and a first two-way valve 170.

[0028] The discharge end of compressor 110 is connected to the first end (D end) of four-way valve 140. The second end (C end) of four-way valve 140 is connected to the refrigerant inlet 121 of indoor heat exchanger 120 through a first pipe 180, which passes through the heat accumulator 150. The refrigerant outlet 122 of indoor heat exchanger 120 is connected to the refrigerant inlet 131 of outdoor heat exchanger 130. The refrigerant outlet 132 of outdoor heat exchanger 130 is connected to the third end (E end) of four-way valve 140. The fourth end (S end) of four-way valve 140 is connected to the suction end of compressor 110 through a second pipe 190 and a third pipe 1100 connected in parallel. A first expansion valve 160 is installed on the second pipe 190, and the second pipe 190 is connected to the heat exchange pipe 151 inside the heat accumulator 150. A first two-way valve 170 is installed on the third pipe 1100.

[0029] In heating mode, the first two-way valve 170 is opened and the first expansion valve 160 is closed; in defrost mode, the first expansion valve 160 is opened and the first two-way valve 170 is closed; in both defrost and heating modes, the first end (D end) and the second end (C end) of the four-way valve 140 are connected, and the third end (E end) and the fourth end (S end) of the four-way valve 140 are connected.

[0030] Specifically, during heating operation in heating mode, the first two-way valve 170 is opened, the first expansion valve 160 is closed, and the first end (D end) and the second end (C end) of the four-way valve 140 are connected, as are the third end (E end) and the fourth end (S end) of the four-way valve 140. Then, the high-temperature, high-pressure refrigerant, after being discharged from the exhaust end of the compressor 110, enters through the first end (D end) of the four-way valve 140 and flows out through the second end (C end), then flows through the first pipe 180 into the indoor heat exchanger 120 for condensation and heat release. The first pipe 180 passes through the heat accumulator 150. Therefore, the high-temperature, high-pressure refrigerant before entering the indoor heat exchanger 120 will first significantly release sensible heat in the heat accumulator 150, effectively heating the heat storage material. The temperature of the heat storage material can be raised to near the system's maximum temperature, achieving greater heat storage capacity and significantly improving the heat storage effect. Then, most of the latent heat of the refrigerant further exchanges heat with the medium in the indoor heat exchanger 120 (i.e., condensation and heat release). Furthermore, the refrigerant flowing out of the indoor heat exchanger 120 enters the outdoor heat exchanger 130, where it evaporates and absorbs heat. Then, it flows in from the third end (E end) of the four-way valve 140 and flows out from the fourth end (S end), and then flows into the suction end of the compressor 110 through the third pipe 1100.

[0031] If defrosting conditions are met during heating operation, the system will enter defrosting mode. In this mode, the first expansion valve 160 opens and the first two-way valve 170 closes, while the four-way valve 140 does not need to be switched (i.e., the first end (D) and the second end (C) remain connected, and the third end (E) and the fourth end (S) remain connected). Furthermore, by adjusting the opening of the second expansion valve 1110 to a non-throttling state, the heat pump unit becomes the outdoor heat exchanger 130 and the indoor heat exchanger 120 as condensers, the first expansion valve 160 becomes a throttling device, and the internal heat exchange pipe 151 of the heat storage tank 150 becomes an evaporator. The heat pump unit forms a new heat exchange system without shutting down or switching the four-way valve 140, effectively establishing a high-low pressure difference. Simultaneously, the heat from the heat storage material and the work done by the compressor are used to defrost the outdoor heat exchanger 130, significantly improving defrosting efficiency and effect.

[0032] Specifically, in defrost mode, high-temperature, high-pressure refrigerant is discharged from the exhaust end of compressor 110, enters through the first end (D end) of four-way valve 140 and flows out through the second end (C end), then flows through the first pipe 180 into indoor heat exchanger 120 for condensation and heat release. The refrigerant flowing out of indoor heat exchanger 120 enters outdoor heat exchanger 130 for further condensation and heat release, defrosting the outdoor heat exchanger. Then, it further flows through the third end (E end) of four-way valve 140 and flows out through the fourth end (S end), and is then throttled by the first expansion valve 160 to reduce pressure and temperature. It then flows through the second pipe 190 into heat exchange pipe 150 within heat storage tank 150, where it evaporates and absorbs heat under the action of the heat storage material, and then flows into the suction end of compressor 110. Thus, the heat from the heat storage material and the work done by the compressor simultaneously defrost outdoor heat exchanger 130.

[0033] In addition, during defrosting mode, the compressor 110 can be adjusted to a suitable operating frequency according to actual conditions. After defrosting is completed, the first two-way valve 170 is opened and the first expansion valve 160 is closed, and the opening degree of the second expansion valve 1110 can be adjusted to a throttling state, and the heat pump unit resumes heating.

[0034] In summary, by simply adding a second pipe in parallel with the third pipe to the heat pump unit and having the first pipe pass through the heat accumulator, and installing a first expansion valve on the second pipe and connecting it to the heat exchange pipe inside the heat accumulator, the high-temperature and high-pressure refrigerant before entering the indoor heat exchanger can store heat in the heat accumulator, thereby improving the heat storage effect of the heat pump unit during heating operation. Moreover, the electronic expansion valve and two-way valve can be easily controlled to form a new heat exchange system without stopping the heat pump unit or reversing the four-way valve, effectively establishing a high and low pressure difference. This allows for efficient and effective defrosting of the outdoor heat exchanger by simultaneously utilizing the heat from the heat storage material and the work done by the compressor. The overall system structure and control method are simple, and the defrosting efficiency and effect are improved.

[0035] For further details, please refer to [link / reference]. Figure 2 and Figure 3 In one embodiment, the refrigerant outlet 122 of the indoor heat exchanger 120 and the refrigerant inlet 131 of the outdoor heat exchanger 130 are connected through a fourth pipe 1120, and a second expansion valve 1110 is provided on the fourth pipe 1120; the heat pump unit also includes a fifth pipe 1130 connected in parallel with the fourth pipe 1120, and a second two-way valve 1140 is provided on the fifth pipe 1130.

[0036] At this time, in heating mode, the second expansion valve 1110 is opened and the second two-way valve 1140 is closed; then, the refrigerant flowing out from the second end (C end) of the four-way valve 140 flows through the first pipe 180 and into the indoor heat exchanger 120 from the refrigerant inlet 121 for condensation and heat release; then, the refrigerant flowing out from the refrigerant outlet 122 of the indoor heat exchanger 120 is first throttled by the second two-way valve 1140 and then enters the outdoor heat exchanger 130 from the refrigerant inlet 131, where it evaporates and absorbs heat.

[0037] When switching to defrost mode, the second expansion valve 1110 is closed and the second two-way valve 1140 is opened, so that the refrigerant will not flow through the fourth pipe 1120 through the second expansion valve 1110, that is, the opening of the second expansion valve 1110 is adjusted to a non-throttling state; while because the second two-way valve 1140 is open, the refrigerant flowing out from the second end (C end) of the four-way valve 140 will eventually flow into the outdoor heat exchanger 130 through the fifth pipe 1130 for condensation and heat release, and defrost the outdoor heat exchanger 130.

[0038] See Figure 2 The first configuration of the fifth pipe 1130, which is connected in parallel with the fourth pipe 1120, can be as follows: the first port of the fifth pipe 1130 is connected to the refrigerant outlet 122 of the indoor heat exchanger 120; the second port of the fifth pipe 1130 is connected to the refrigerant inlet 131 of the outdoor heat exchanger 130.

[0039] In this configuration, when switching to defrost mode, since the second expansion valve 1110 is closed and the second two-way valve 1140 is open, the refrigerant flowing out from the second end (C end) of the four-way valve 140 will first flow through the indoor heat exchanger 120 for condensation and heat release, and then finally flow through the fifth pipe 1130 into the outdoor heat exchanger 130 for condensation and heat release. At this time, the heat pump unit becomes a condenser for both the outdoor heat exchanger 130 and the indoor heat exchanger 120.

[0040] See Figure 3 The second configuration of the fifth pipe 1130, which is connected in parallel with the fourth pipe 1120, can be as follows: the first port of the fifth pipe 1130 is connected to the first pipe 180; the second port of the fifth pipe 1130 is connected to the refrigerant inlet 131 of the outdoor heat exchanger 130.

[0041] In this configuration, when switching to defrost mode, since the second expansion valve 1110 is closed and the second two-way valve 1140 is open, the refrigerant flowing out from the second end (C end) of the four-way valve 140 will not flow through the indoor heat exchanger 120 first, but will flow directly into the outdoor heat exchanger 130 through the fifth pipe 1130 for condensation and heat release. At this time, the heat pump unit becomes the outdoor heat exchanger 130 as a separate condenser.

[0042] In one embodiment, when the first port of the fifth pipe 1130 is connected to the first pipe 180, the first port of the fifth pipe 1130 may specifically be connected to the first pipe 180 located at "such as Figure 3 On the section of pipe between the heat accumulator 150 and the refrigerant inlet 121 shown; at this time, the refrigerant flowing out from the second end (C end) of the four-way valve 140 will first flow through the heat accumulator 150 through the first pipe 180, and then flow into the outdoor heat exchanger 130 through the fifth pipe 1130.

[0043] In one embodiment, when the first port of the fifth pipe 1130 is connected to the first pipe 180, in another embodiment, the first port of the fifth pipe 1130 can specifically be connected to the first pipe 180 located at "such as Figure 3 The portion of the pipe between the heat accumulator 150 and the second end (C end) is shown; at this time, the refrigerant flowing out from the second end (C end) of the four-way valve 140 will flow directly into the fifth pipe 1130 through the first pipe 180, and further flow into the outdoor heat exchanger 130 through the fifth pipe 1130.

[0044] It is understood that in the foregoing embodiments of this application, the first expansion valve 160 and the second expansion valve 1110 are electronic expansion valves. The first two-way valve 170 and the second two-way valve 1140 are two-way valves.

[0045] The following further describes the process of heat storage and defrosting control of the heat pump unit in the aforementioned embodiments from the perspective of heat pump unit control methods. The heat pump unit control method can be executed by an electronic device or server with processing capabilities. The electronic device can be the heat pump unit's main controller, remote control, wired controller, mobile phone, computer, smartwatch, or other home appliances. The server can be a cloud server or a physical server.

[0046] The system structure and terminology of the heat pump unit are the same as in the aforementioned heat pump unit embodiments. Specific implementation details can be found in the descriptions of the aforementioned embodiments. See also... Figure 4 The heat pump unit control method may specifically include steps S210 to S220.

[0047] Step S210: When entering the heating mode, control the first two-way valve to open and the first expansion valve to close, and control the first and second ends of the four-way valve to connect and the third and fourth ends to connect. Step S220: When switching from heating mode to defrosting mode, the first two-way valve is closed and the first expansion valve is opened.

[0048] During heating operation in heating mode, the first two-way valve 170 is opened, the first expansion valve 160 is closed, and the first end (D end) and the second end (C end) of the four-way valve 140 are connected, as are the third end (E end) and the fourth end (S end) of the four-way valve 140. Then, the high-temperature, high-pressure refrigerant, after being discharged from the exhaust end of the compressor 110, enters through the first end (D end) of the four-way valve 140 and flows out through the second end (C end), then flows through the first pipe 180 into the indoor heat exchanger 120 for condensation and heat release. The first pipe 180 passes through the heat accumulator 150. Therefore, the high-temperature, high-pressure refrigerant before entering the indoor heat exchanger 120 will first significantly release sensible heat in the heat accumulator 150, effectively heating the heat storage material. The temperature of the heat storage material can be raised to near the system's maximum temperature, achieving greater heat storage capacity and significantly improving the heat storage effect. Then, most of the latent heat of the refrigerant further exchanges heat with the medium in the indoor heat exchanger 120 (i.e., condensation and heat release). Furthermore, the refrigerant flowing out of the indoor heat exchanger 120 enters the outdoor heat exchanger 130, where it evaporates and absorbs heat. Then, it flows in from the third end (E end) of the four-way valve 140 and flows out from the fourth end (S end), and then flows into the suction end of the compressor 110 through the third pipe 1100.

[0049] If defrosting conditions are met during heating operation, the system will enter defrosting mode. In this mode, the first expansion valve 160 opens and the first two-way valve 170 closes, while the four-way valve 140 does not need to be switched (i.e., the first end (D) and the second end (C) remain connected, and the third end (E) and the fourth end (S) remain connected). Furthermore, by adjusting the opening of the second expansion valve 1110 to a non-throttling state, the heat pump unit becomes the outdoor heat exchanger 130 and the indoor heat exchanger 120 as condensers, the first expansion valve 160 becomes a throttling device, and the internal heat exchange pipe 151 of the heat storage tank 150 becomes an evaporator. The heat pump unit forms a new heat exchange system without shutting down or switching the four-way valve 140, effectively establishing a high-low pressure difference. Simultaneously, the heat from the heat storage material and the work done by the compressor are used to defrost the outdoor heat exchanger 130, significantly improving defrosting efficiency and effect.

[0050] In summary, by simply adding a second pipe connected in parallel with the third pipe to the heat pump unit, and having the first pipe pass through the heat accumulator, and installing a first expansion valve on the second pipe that connects to the heat exchange pipe inside the heat accumulator, the high-temperature, high-pressure refrigerant before entering the indoor heat exchanger can store heat in the heat accumulator, improving the heat storage effect of the heat pump unit during heating operation. Moreover, the electronic expansion valve and two-way valve can be easily controlled to form a new heat exchange system without stopping the heat pump unit or reversing the four-way valve, effectively establishing a high and low pressure difference. This allows for efficient and effective defrosting of the outdoor heat exchanger by simultaneously utilizing the heat from the heat storage material and the work done by the compressor. The overall system structure and control method are simple, while improving defrosting efficiency and effect.

[0051] Furthermore, in one embodiment, the refrigerant outlet 122 of the indoor heat exchanger 120 and the refrigerant inlet 131 of the outdoor heat exchanger 130 are connected through a fourth pipe 1120, and a second expansion valve 1110 is provided on the fourth pipe 1120; the heat pump unit also includes a fifth pipe 1130 connected in parallel with the fourth pipe 1120, and a second two-way valve 1140 is provided on the fifth pipe 1130; the heat pump unit control method may further include: in the heating mode, controlling the second expansion valve to open and the second two-way valve to close; when switching from the heating mode to the defrost mode, controlling the second expansion valve to close and the second two-way valve to open.

[0052] At this time, in heating mode, the second expansion valve 1110 is opened and the second two-way valve 1140 is closed; then, the refrigerant flowing out from the second end (C end) of the four-way valve 140 flows through the first pipe 180 and into the indoor heat exchanger 120 from the refrigerant inlet 121 for condensation and heat release; then, the refrigerant flowing out from the refrigerant outlet 122 of the indoor heat exchanger 120 is first throttled by the second two-way valve 1140 and then enters the outdoor heat exchanger 130 from the refrigerant inlet 131, where it evaporates and absorbs heat. When switching to defrost mode, the second expansion valve 1110 is closed and the second two-way valve 1140 is opened, so that the refrigerant will not flow through the fourth pipe 1120 through the second expansion valve 1110, that is, the opening of the second expansion valve 1110 is adjusted to a non-throttling state; while because the second two-way valve 1140 is open, the refrigerant flowing out from the second end (C end) of the four-way valve 140 will eventually flow into the outdoor heat exchanger 130 through the fifth pipe 1130 for condensation and heat release, and defrost the outdoor heat exchanger 130.

[0053] In this way, by further adding a fifth pipe 1130 connected in parallel with the fourth pipe 1120 and installing a second two-way valve 1140 on it, when switching to defrost mode, the refrigerant can flow into the outdoor heat exchanger 130 through the fifth pipe in a completely unthrottled state for defrosting, further ensuring defrosting efficiency and defrosting effect.

[0054] In other embodiments, without the fifth pipe 1130, adjusting the opening of the second expansion valve 1110 to a non-throttling state can be achieved by "adjusting the second expansion valve 1110 to the maximum allowable opening".

[0055] Furthermore, in one embodiment, when switching from heating mode to defrost mode, the process may further include: determining a target compressor frequency based on the outdoor ambient temperature and the outdoor coil temperature of the outdoor heat exchanger; and controlling the compressor to operate at the target compressor frequency.

[0056] The outdoor coil temperature refers to the temperature of the coil on the outdoor heat exchanger. The outdoor ambient temperature refers to the ambient temperature outside the room. Both the outdoor ambient temperature and the outdoor coil temperature reflect the frost condition on the outdoor heat exchanger. When switching from heating mode to defrost mode, the target compressor frequency is determined based on the outdoor ambient temperature and the outdoor coil temperature of the outdoor heat exchanger, and the compressor is controlled to operate at the target compressor frequency, which can further improve the defrosting effect.

[0057] Among them, the preset temperature range in which the temperature difference between the outdoor ambient temperature and the outdoor coil temperature is located can be found in the preset frequency table, and the preset target compressor frequency corresponding to the preset temperature range can be determined from it. Different preset temperature ranges correspond to different preset target compressor frequencies.

[0058] In other embodiments, when switching from heating mode to defrost mode, the compressor can be controlled to operate at a preset compressor frequency in defrost mode. In some other embodiments, the frost thickness of the outdoor heat exchanger can be determined based on other relevant parameters of the heat pump unit, and the compressor can be controlled to operate at a preset compressor frequency corresponding to that frost thickness.

[0059] Furthermore, in one embodiment, after controlling the first two-way valve to close and the first expansion valve to open, the method may further include: when it is determined that the defrosting end condition is met, controlling the first two-way valve to open and the first expansion valve to close.

[0060] When the defrosting end conditions are met, defrosting is considered complete. At this point, the first two-way valve 170 is opened, the first expansion valve 160 is closed, and the opening of the second expansion valve 1110 can be adjusted to a throttling state, thereby resuming the heat pump unit for heating. The defrosting end conditions can include operating in defrosting mode for a preset duration, or the temperature difference between the outdoor ambient temperature and the outdoor coil temperature falling within a preset end range.

[0061] Furthermore, embodiments of this application also provide an electronic device, such as... Figure 5 As shown, Figure 5 A block diagram of an electronic device according to an embodiment of this application is shown, specifically: The electronic device may include components such as a processor 501 with one or more processing cores, a memory 502 with one or more computer-readable storage media, a power supply 503, and an input unit 504. Those skilled in the art will understand that... Figure 5 The electronic device structure shown does not constitute a limitation on the electronic device and may include more or fewer components than shown, or combine certain components, or have different component arrangements. Wherein: The processor 501 is the control center of the electronic device, connecting various parts of the computer device via various interfaces and lines. It executes software programs and / or modules stored in the memory 502, and calls data stored in the memory 502, to perform various functions of the computer device and process data. Optionally, the processor 501 may include one or more processing cores; preferably, the processor 501 may integrate an application processor and a modem processor, wherein the application processor mainly handles the operating system, user page, and application programs, and the modem processor mainly handles wireless communication. It is understood that the modem processor may not be integrated into the processor 501.

[0062] The memory 502 can be used to store software programs and modules. The processor 501 executes various functional applications and data processing by running the software programs and modules stored in the memory 502. The memory 502 may mainly include a program storage area and a data storage area. The program storage area may store the operating system, application programs required for at least one function (such as sound playback function, image playback function, etc.), etc.; the data storage area may store data created according to the use of the electronic device, etc. In addition, the memory 502 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device. Accordingly, the memory 502 may also include a memory controller to provide the processor 501 with access to the memory 502.

[0063] The electronic device also includes a power supply 503 that supplies power to various components. Preferably, the power supply 503 can be logically connected to the processor 501 through a power management system, thereby enabling functions such as charging, discharging, and power consumption management through the power management system. The power supply 503 may also include one or more DC or AC power supplies, recharging systems, power fault detection circuits, power converters or inverters, power status indicators, and other arbitrary components.

[0064] The electronic device may also include an input unit 504, which can be used to receive input digital or character information and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control.

[0065] Although not shown, the electronic device may also include a display unit, etc., which will not be described in detail here. Specifically, in this embodiment, the processor 501 in the electronic device can load the executable files corresponding to the processes of one or more computer programs into the memory 502 according to the following instructions, and the processor 501 runs the computer programs stored in the memory 502, thereby realizing the various functions in the foregoing embodiments of this application.

[0066] For example, processor 501 can execute: when entering heating mode, controlling the first two-way valve to open and the first expansion valve to close, and controlling the first and second ends of the four-way valve to connect and the third and fourth ends to connect; when switching from heating mode to defrost mode, controlling the first two-way valve to close and the first expansion valve to open.

[0067] Furthermore, in some embodiments, the processor 501 may also perform the following actions: in heating mode, controlling the second expansion valve to open and the second two-way valve to close; when switching from heating mode to defrost mode, controlling the second expansion valve to close and the second two-way valve to open.

[0068] Furthermore, in some embodiments, the processor 501 may also perform the following: determining a target compressor frequency based on the outdoor ambient temperature and the outdoor coil temperature of the outdoor heat exchanger; and controlling the compressor to operate at the target compressor frequency.

[0069] Furthermore, in some embodiments, the processor 501 may also perform the following: when it is determined that the defrosting end condition is met, control the first two-way valve to open and the first expansion valve to close.

[0070] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be performed by a computer program, or by a computer program controlling related hardware. The computer program can be stored in a computer-readable storage medium and loaded and executed by a processor.

[0071] Therefore, embodiments of this application also provide a storage medium storing a computer program that can be loaded by a processor to execute the steps in any of the methods provided in embodiments of this application.

[0072] The storage medium can be a computer-readable storage medium, which may include: read-only memory (ROM), random access memory (RAM), disk or optical disk, etc.

[0073] Since the computer program stored in the storage medium can execute the steps of any of the methods provided in the embodiments of this application, the beneficial effects that the methods provided in the embodiments of this application can achieve can be realized. For details, please refer to the previous embodiments, which will not be repeated here.

[0074] According to another embodiment of this application, a computer program product or computer program includes computer instructions stored in a computer-readable storage medium. A processor of an electronic device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the electronic device to perform the methods provided in the various optional implementations described in the embodiments of this application.

[0075] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein.

[0076] It should be understood that this application is not limited to the embodiments described above and shown in the accompanying drawings, but various modifications and changes can be made without departing from its scope.

Claims

1. A heat pump unit, characterized in that, The heat pump unit includes a compressor, an indoor heat exchanger, an outdoor heat exchanger, a four-way valve, a heat accumulator, a first expansion valve, and a first two-way valve; The discharge end of the compressor is connected to the first end of the four-way valve, and the second end of the four-way valve is connected to the indoor heat exchanger through a first pipe, and the first pipe passes through the heat accumulator. The indoor heat exchanger is connected to the outdoor heat exchanger, the outdoor heat exchanger is connected to the third end of the four-way valve, and the fourth end of the four-way valve is connected to the suction end of the compressor through the second and third pipes connected in parallel; the first expansion valve is installed on the second pipe and is connected to the heat exchange pipe inside the heat accumulator; the first two-way valve is installed on the third pipe. In heating mode, the first two-way valve is open and the first expansion valve is closed; in defrost mode, the first expansion valve is open and the first two-way valve is closed; in both defrost mode and heating mode, the first end and the second end are connected, and the third end and the fourth end are connected.

2. The heat pump unit according to claim 1, characterized in that, The indoor heat exchanger and the outdoor heat exchanger are connected through a fourth pipe, and a second expansion valve is installed on the fourth pipe; the heat pump unit also includes a fifth pipe connected in parallel with the fourth pipe, and a second two-way valve is installed on the fifth pipe; In the heating mode, the second expansion valve is open and the second two-way valve is closed; in the defrosting mode, the second expansion valve is closed and the second two-way valve is open.

3. The heat pump unit according to claim 2, characterized in that, The first port of the fifth pipe is connected to the refrigerant outlet of the indoor heat exchanger; the second port of the fifth pipe is connected to the refrigerant inlet of the outdoor heat exchanger.

4. The heat pump unit according to claim 2, characterized in that, The first port of the fifth pipe is connected to the refrigerant inlet of the indoor heat exchanger; the second port of the fifth pipe is connected to the first pipe.

5. A control method for a heat pump unit, characterized in that, The heat pump unit includes a compressor, an indoor heat exchanger, an outdoor heat exchanger, a four-way valve, a heat accumulator, a first expansion valve, and a first two-way valve; The discharge end of the compressor is connected to the first end of the four-way valve, and the second end of the four-way valve is connected to the indoor heat exchanger through a first pipe, and the first pipe passes through the heat accumulator. The indoor heat exchanger is connected to the outdoor heat exchanger, the outdoor heat exchanger is connected to the third end of the four-way valve, and the fourth end of the four-way valve is connected to the suction end of the compressor through the second and third pipes connected in parallel; the first expansion valve is installed on the second pipe and is connected to the heat exchange pipe inside the heat accumulator; the first two-way valve is installed on the third pipe. The method includes: When entering heating mode, the first two-way valve is opened and the first expansion valve is closed, and the first and second ends of the four-way valve are connected and the third and fourth ends are connected. When switching from the heating mode to the defrosting mode, the first two-way valve is closed and the first expansion valve is opened.

6. The method according to claim 5, characterized in that, The indoor heat exchanger and the outdoor heat exchanger are connected through a fourth pipe, and a second expansion valve is installed on the fourth pipe; the heat pump unit also includes a fifth pipe connected in parallel with the fourth pipe, and a second two-way valve is installed on the fifth pipe; In the heating mode, the method further includes: controlling the second expansion valve to open and the second two-way valve to close; When switching from the heating mode to the defrosting mode, the method further includes: controlling the second expansion valve to close and the second two-way valve to open.

7. The method according to claim 5, characterized in that, When switching from the heating mode to the defrosting mode, the method further includes: The target compressor frequency is determined based on the outdoor ambient temperature and the outdoor coil temperature of the outdoor heat exchanger. Control the compressor to operate at the target compressor frequency.

8. The method according to claim 5, characterized in that, After controlling the first two-way valve to close and the first expansion valve to open, the method further includes: When it is determined that the defrosting end condition is met, the first two-way valve is opened and the first expansion valve is closed.

9. A storage medium, characterized in that, It stores a computer program that, when executed by the processor of the electronic device, causes the electronic device to perform the method described in any one of claims 5 to 8.

10. An electronic device, characterized in that, include: Memory, which stores computer programs; The processor reads a computer program stored in memory to perform the method described in any one of claims 5 to 8.

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