Heat pump unit, control method thereof, and storage medium

Abstract

The application provides a heat pump unit and a control method and a storage medium thereof. The method is applied to the field of heat pumps. The heat pump unit comprises a gas-liquid separator, a first evaporator, a second evaporator, an ejector, a four-way valve, a regenerator, an air cooler, a first valve body and a second valve body. The method comprises the following steps: obtaining an operation mode of the heat pump unit; if the operation mode is a defrosting mode, controlling the first valve body to be closed, the second valve body to be opened, and the refrigerant heated by the regenerator to be transported to the gas-liquid separator through the ejector, the four-way valve and the second evaporator. The problem that the high-low pressure difference on both sides of the four-way valve is large, resulting in the failure of the four-way valve adjustment, is avoided during defrosting.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat pump, in particular to a heat pump unit, a control method thereof and a storage medium. BACKGROUND

[0002] During the heat pump unit heating in winter, if the environment temperature is low, the frost will appear on the outer surface of the evaporator of the heat pump unit, and when the frost accumulates to a certain extent, the heat exchange performance of the evaporator will be weakened, and the heating capacity of the heat pump unit will be reduced. In the related technology, the heat pump unit can usually defrost through reverse circulation, but for the heat pump unit with carbon dioxide as refrigerant, when defrosting through reverse circulation, the high-low pressure difference on both sides of the four-way valve is large, which easily leads to the failure of the four-way valve adjustment.

[0003] Therefore, how to defrost the heat pump unit when the heat pump unit is running under the condition of low environment temperature becomes a problem to be solved. SUMMARY

[0004] The present application provides a heat pump unit, a control method thereof and a storage medium, which aims to avoid the problem that the high-low pressure difference on both sides of the four-way valve is large when defrosting, leading to the failure of the four-way valve adjustment. The technical solution is as follows:

[0005] In a first aspect, the embodiments of the present application provide a control method of a heat pump unit, applied to the heat pump unit, wherein the heat pump unit comprises a gas-liquid separator, a first evaporator, a second evaporator, an ejector, a four-way valve, a regenerator, an air cooler, a first valve body, a second valve body and a third valve body, the gas-liquid separator, the regenerator and the air cooler are connected in sequence, the first valve body is connected with the air cooler and the ejector respectively, the second valve body is connected with the air cooler and the regenerator respectively, the ejector is connected with the four-way valve and the regenerator respectively, the four-way valve is connected with the first evaporator and the second evaporator respectively, the first evaporator is connected with the gas-liquid separator, and the second evaporator is connected with the gas-liquid separator, the method comprises: acquiring the operation mode of the heat pump unit; if the operation mode is a defrosting mode, controlling to close the first valve body, open the second valve body, and transport the refrigerant heated by the regenerator to the gas-liquid separator through the ejector, the four-way valve and the second evaporator.

[0006] In a second aspect, the embodiments of the present specification provide a heat pump unit, comprising a gas-liquid separator, a first evaporator, a second evaporator, an ejector, a four-way valve, a regenerator, an air cooler, a first valve body, a second valve body, and a processor, the gas-liquid separator, the regenerator, and the air cooler are connected in sequence, the first valve body is connected with the air cooler and the ejector respectively, the second valve body is connected with the air cooler and the regenerator respectively, the ejector is connected with the four-way valve and the regenerator respectively, the four-way valve is connected with the first evaporator and the second evaporator respectively, the first evaporator is connected with the gas-liquid separator, and the processor is connected with the four-way valve, the first valve body, and the third valve body respectively,

[0007] The first evaporator is configured to convert refrigerant from liquid state to gaseous state.

[0008] The second evaporator is configured to convert refrigerant from liquid state to gaseous state.

[0009] The gas-liquid separator is configured to separate liquid refrigerant and gaseous refrigerant.

[0010] The regenerator is configured to heat refrigerant.

[0011] The air cooler is configured to exchange heat with refrigerant to generate hot water.

[0012] The ejector is configured to mix refrigerant.

[0013] The four-way valve, the first valve body, and the second valve body are configured to control the flow of refrigerant.

[0014] The processor is configured to obtain an operation mode of the heat pump unit, and if the operation mode is a defrosting mode, control the first valve body to be closed, the second valve body to be opened, and refrigerant heated by the regenerator to be transported to the gas-liquid separator through the ejector, the four-way valve, and the second evaporator.

[0015] In a third aspect, the embodiments of the present specification provide a computer readable storage medium, and the computer readable storage medium stores a computer program, and the computer program is executed to implement the steps of the above method.

[0016] In the embodiment of the present application, an ejector, a first valve body, a second valve body and a four-way valve are added in the heat pump unit. When the heat pump unit is in the defrosting mode, the first valve body is controlled to be closed, the second valve body is controlled to be opened, and the regenerator is controlled to heat the refrigerant output from the air cooler and then deliver the refrigerant to the ejector and then to the second evaporator, thereby avoiding the problem that the high and low pressure difference on both sides of the four-way valve is large during defrosting, resulting in the failure of the four-way valve adjustment. In the present application, the high-temperature and high-pressure refrigerant and the low-temperature and low-pressure refrigerant are mixed in the ejector to obtain medium-temperature and medium-pressure refrigerant, which is then delivered to the four-way valve, thereby reducing the pressure difference between the high side and the low side of the four-way valve, achieving effective control of the four-way valve in the defrosting mode, and controlling the heat pump unit to defrost. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1A FIG. 1 is a schematic diagram of an architecture of a heat pump unit provided by an embodiment of the present application;

[0018] Figure 1B FIG. 1 is a schematic diagram of an architecture of a heat pump unit provided by an embodiment of the present application;

[0019] Figure 1C FIG. 1 is a schematic diagram of an architecture of a heat pump unit provided by an embodiment of the present application;

[0020] Figure 2 FIG. 1 is a schematic diagram of an architecture of a heat pump unit provided by an embodiment of the present application;

[0021] Figure 3 FIG. 1 is a schematic diagram of an architecture of a heat pump unit provided by an embodiment of the present application;

[0022] Figure 4 FIG. 1 is a schematic diagram of an architecture of a heat pump unit provided by an embodiment of the present application;

[0023] Figure 5 FIG. 1 is a schematic diagram of an architecture of a heat pump unit provided by an embodiment of the present application; DETAILED DESCRIPTION

[0024] The technical solutions in the present application will be described in detail below with reference to the drawings. In the description of the embodiments of the present application, unless otherwise specified, " / " represents the meaning of or, for example, A / B can represent A or B: "and / or" in the text only describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0025] Hereinafter, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" are used only for descriptive purposes and should not be construed as implying or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" can explicitly or implicitly include one or more of the features.

[0026] In the related art, one can be heated by installing a resistance wire on the evaporator to defrost, this method has short defrosting time, simple system design, but the disadvantage is high energy consumption, large heat loss. The second can be defrosted by reverse cycle, but because of the high operating pressure of carbon dioxide heat pump and the high cost of low pressure side pressure design, reverse cycle defrosting is rarely used. Therefore, under the condition of low ambient temperature, how to defrost the heat pump unit becomes a problem to be solved.

[0027] Based on the above situation, the control method of the heat pump unit provided by the embodiments of the present specification is proposed, please see Figure 1A , Figure 1B , Figure 1C , Figure 1A , Figure 1B , Figure 1C is a schematic diagram of the architecture of a heat pump unit provided by the embodiments of the present specification.

[0028] For example, Figure 1AAs shown, the heat pump unit comprises a processor (omitted in the figure), a gas-liquid separator 12, a first evaporator 8, a second evaporator 9, an ejector 6, a four-way valve 7, a regenerator 3, an air cooler 2, a first valve body 4, a second valve body 5, the gas-liquid separator 12, the regenerator 3, and the air cooler 2 are connected in sequence, the first valve body 4 is connected with the air cooler 2 and the ejector 6 respectively, the second valve body 5 is connected with the air cooler 2 and the regenerator 3 respectively, the ejector 6 is connected with the four-way valve 7 and the regenerator 3 respectively, the four-way valve 7 is connected with the first evaporator 8 and the second evaporator 9 respectively, and the first evaporator 8 is connected with the gas-liquid separator 12. The processor is connected with the four-way valve, the first valve body, the second valve body, and the third valve body respectively. In addition, the heat pump unit further comprises a compressor 1, which compresses the gaseous refrigerant separated from the gas-liquid separator 12 into high-temperature and high-pressure supercritical state refrigerant and delivers it to the regenerator 3, and the regenerator 3 determines whether to store heat for the refrigerant delivered from the compressor 1 according to the operation mode of the heat pump unit. Specifically, if the operation mode of the heat pump unit is a defrosting mode, the regenerator 3 stores heat for the refrigerant delivered from the compressor 1, and then delivers it to the air cooler 2. After receiving the high-temperature and high-pressure refrigerant, the air cooler 2 exchanges heat with the refrigerant to generate hot water, and then outputs the refrigerant to the regenerator 3. When receiving the refrigerant delivered by the air cooler 2, the regenerator 3 heats it and then delivers it to the ejector 6. If the operation mode of the heat pump unit is a heating mode, the regenerator 3 is in a bypass state at this time, directly delivers the received refrigerant to the air cooler 2, and the air cooler 2 exchanges heat with the refrigerant to generate hot water and deliver it to the action space of the heat pump unit to provide a heat source. The refrigerant after heat exchange is output to the ejector 6 through the first valve body 4. After receiving the liquid refrigerant delivered by the gas-liquid separator 12, the first evaporator 8 or the second evaporator 9 converts the liquid refrigerant into low-temperature and low-pressure gaseous refrigerant and delivers it to the ejector 6. The ejector 6 mixes the high-temperature and high-pressure refrigerant and the low-temperature and low-pressure gaseous refrigerant. The second evaporator 9 is a finned heat exchanger and is connected with a fan 10. The four-way valve 7, the first valve body 4, and the second valve body 5 are used to control the flow of the refrigerant.

[0029] Optionally, in the embodiment of the present application, the four-way valve 7 comprises a first valve port a, a second valve port b, a third valve port c, and a fourth valve port d.

[0030] Referring to Figure 1BIn the defrosting mode, the first valve port a is in communication with the third valve port c, and the second valve port b is in communication with the fourth valve port d. The low-temperature and low-pressure gaseous refrigerant is transported from the first evaporator 8 to the ejector 6 through the first valve port a and the third valve port c, and mixed with the high-temperature and high-pressure refrigerant in the ejector 6 to become medium-temperature and medium-pressure refrigerant. The medium-temperature and medium-pressure refrigerant is transported from the ejector 6 to the second evaporator 9 through the second valve port b and the fourth valve port d. The high-temperature and high-pressure refrigerant is refrigerant with a pressure at the first pressure threshold and a temperature at the first temperature threshold. The medium-temperature and medium-pressure refrigerant is refrigerant with a pressure at the second pressure threshold and a temperature at the second temperature threshold. The low-temperature and low-pressure gaseous refrigerant is gaseous refrigerant with a pressure at the third pressure threshold and a temperature at the third temperature threshold.

[0031] Referring to Figure 1C In the heating mode, the third valve port c is in communication with the fourth valve port d, and the first valve port a is in communication with the second valve port b. The low-temperature and low-pressure gaseous refrigerant is transported from the second evaporator 9 to the ejector 6 through the third valve port c and the fourth valve port d, and mixed with the high-temperature and high-pressure refrigerant in the ejector 6 to become medium-temperature and medium-pressure refrigerant. The medium-temperature and medium-pressure refrigerant is transported from the ejector 6 to the first evaporator 8 through the first valve port a and the second valve port b. The medium-temperature and high-pressure refrigerant is refrigerant with a pressure at the first pressure threshold and a temperature at the second temperature threshold. The medium-temperature and medium-pressure refrigerant is refrigerant with a pressure at the second pressure threshold and a temperature at the second temperature threshold. The low-temperature and low-pressure gaseous refrigerant is gaseous refrigerant with a pressure at the third pressure threshold and a temperature at the third temperature threshold.

[0032] Optionally, the ejector 6 comprises a high-pressure inlet, a low-pressure inlet, and an exhaust port. The high-pressure inlet is connected with the regenerator 3 and the first valve body 4, respectively. Thus, when the operating mode of the heat pump unit is the heating mode, the medium-temperature and high-pressure refrigerant discharged from the air cooler 2 can be transported to the ejector 6 through the first valve body 4. When the operating mode of the heat pump unit is the defrosting mode, the medium-temperature and high-pressure refrigerant discharged from the air cooler 2 can be transported to the regenerator 3 through the second valve body 5 for heating to obtain high-temperature and high-pressure refrigerant, which is then output from the regenerator 3 to the ejector 6. Finally, the mixed refrigerant in the ejector 6 is output to the first evaporator 8 or the second evaporator 9 through the exhaust port.

[0033] Optionally, the heat pump unit further comprises a third valve body connected with the second evaporator, the gas-liquid separator, and the processor, respectively. The third valve body is used for controlling the flow of the refrigerant. By controlling the third valve body, the refrigerant can flow to the second heat exchanger or the gas-liquid separator through the third valve body, realizing the circulation of the refrigerant in different modes.

[0034] In the embodiment of the present application, by adding the ejector 6, the first valve body 4, the second valve body 5, the third valve body 11 and the four-way valve 7 in the heat pump unit, when the operation mode of the heat pump unit is the defrosting mode, the communication of the ejector 6, the first valve body 4, the second valve body 5 and the four-way valve 7 is controlled, the second heat exchanger is defrosted, the air cooler is controlled to exchange heat, hot water is generated, and the refrigerant pressure is adjusted by the ejector to avoid the problem that when defrosting, the high and low pressure difference on both sides of the four-way valve is large, which causes the four-way valve to fail to adjust, that is, in the embodiment of the present application, the high-temperature and high-pressure refrigerant and the low-temperature and low-pressure refrigerant are mixed in the ejector to obtain medium-temperature and medium-pressure refrigerant, which is then delivered to the four-way valve, so that the pressure difference on the high side and the low side of the four-way valve is reduced, the four-way valve is effectively controlled in the defrosting mode, and the heat pump unit is defrosted. The gaseous refrigerant separated from the gas-liquid separator 12 is compressed by the compressor 1 to obtain high-temperature and high-pressure, supercritical-state refrigerant, which is then delivered to the heat exchanger 3 to realize refrigerant circulation. When the operation mode of the heat pump unit is the defrosting mode, the communication states of the first valve port a, the second valve port b, the third valve port c and the fourth valve port d of the four-way valve 7 are controlled, the high-temperature and high-pressure refrigerant and the low-temperature and low-pressure refrigerant are mixed in the ejector 6 to obtain medium-temperature and medium-pressure refrigerant, which is then output to the second heat exchanger through the four-way valve for defrosting. When the heat pump unit is in the heating mode, the first valve body is opened and the second valve body is closed, the refrigerant output from the air cooler is delivered to the ejector through the first valve body, the low-temperature and low-pressure refrigerant delivered through the second evaporator and the four-way valve is mixed with the refrigerant in the ejector to generate medium-temperature and medium-pressure refrigerant, which is then delivered to the gas-liquid separator through the first evaporator to realize refrigerant circulation in the heating process, the first evaporator and the second evaporator are used to absorb heat in a double-heat-source manner to generate hot water, and the heating efficiency of the heat pump unit in the heating mode is improved; when the operation mode of the heat pump unit is the heating mode, the communication states of the first valve port a, the second valve port b, the third valve port c and the fourth valve port d of the four-way valve 7 are controlled, the medium-temperature and high-pressure refrigerant and the low-temperature and low-pressure refrigerant are mixed in the ejector 6 to obtain medium-temperature and medium-pressure refrigerant, which is then output to the gas-liquid separator 12 through the first heat exchanger to realize efficient heating of the heat pump unit.

[0035] The control method of the heat pump unit provided in the present specification will be described in detail below in conjunction with specific embodiments. It can be understood that in the embodiment of the present application, the execution subject of the control method of the heat pump unit is the processor of the heat pump unit.

[0036] Figure 2 is a flowchart of a control method of a heat pump unit provided in an embodiment of the present specification. It should be understood that the method can be applied to the heat pump unit in FIG. 1.

[0037] As shown in FIG. 1, the heat pump unit comprises a compressor 1, a first heat exchanger 2, a second heat exchanger 3, a gas-liquid separator 12, a first valve body 4, a second valve body 5, a third valve body 11, a four-way valve 7 and an ejector 6. Figure 2As shown, the method of the embodiments of the present application can include the following steps S101-S103.

[0038] S101, obtaining an operation mode of the heat pump unit;

[0039] In an embodiment, the operation mode of the heat pump unit can include a cooling mode, a heating mode, a defrosting mode, and a dehumidifying mode. Alternatively, in the embodiments of the present application, the heating mode and the defrosting mode of the heat pump unit are controlled. It can be understood that when the heat pump unit is in the heating mode, the heat pump unit extracts heat from outdoor air through the compressed circulating refrigerant, then exchanges heat in the air cooler of the heat pump unit to generate hot water, and provides the hot water to the action space to increase the temperature of the action space; when the heat pump unit is in the defrosting mode, the medium-temperature and medium-pressure refrigerant generated in the ejector of the heat pump unit is delivered to the fin heat exchanger (the second evaporator described above), which has a relatively high temperature, thereby defrosting the second evaporator.

[0040] Alternatively, in the embodiments of the present application, in any operation mode of the heat pump unit, the compressor is controlled to compress the refrigerant output from the gas-liquid separator, specifically, the compressor sucks in the low-temperature and low-pressure refrigerant and then compresses it into high-temperature and high-pressure refrigerant, which is delivered to the heat exchanger to complete the refrigerant circulation, thereby realizing the normal operation of the heat pump unit.

[0041] S102, if the operation mode is the defrosting mode, the first valve body is controlled to be closed, the second valve body and the third valve body are controlled to be opened, and the refrigerant heated by the heat exchanger is delivered to the gas-liquid separator through the ejector, the four-way valve, and the second evaporator;

[0042] In an embodiment, when the operation mode of the heat pump unit is the defrosting mode, it is determined that the second heat exchanger needs to be defrosted. The heat pump unit controls the first valve body to be closed and the second valve body to be opened. Since the first valve body is connected to the air cooler and the ejector respectively, the medium-temperature and high-pressure refrigerant from the air cooler cannot be delivered to the ejector through the first valve body when the first valve body is closed. When the second valve body is opened, since the second valve body is connected to the air cooler and the heat exchanger, the medium-temperature and high-pressure refrigerant from the air cooler is delivered to the heat exchanger to be heated, thereby obtaining high-temperature and high-pressure refrigerant. At the same time, the liquid refrigerant in the gas-liquid separator is delivered to the first evaporator, the liquid refrigerant is converted into low-temperature and low-pressure gaseous refrigerant through the first evaporator, and then the low-temperature and low-pressure gaseous refrigerant is delivered to the ejector through the four-way valve. The low-temperature and low-pressure gaseous refrigerant and the high-temperature and high-pressure refrigerant are mixed in the ejector to obtain medium-temperature and medium-pressure refrigerant, and the medium-temperature and medium-pressure refrigerant is delivered to the second evaporator to increase the temperature of the second evaporator, and then delivered to the gas-liquid separator, thereby completing the circulation process of the refrigerant in the defrosting mode.

[0043] In the embodiment of the present application, an ejector, a first valve body, a second valve body, a third valve body and a four-way valve are added in the heat pump unit. When the heat pump unit is in the defrosting mode, the first valve body is controlled to be closed, the second valve body is controlled to be opened, and the heat exchanger is controlled to heat the refrigerant output from the air cooler and then deliver the refrigerant to the ejector and then to the second evaporator, so that the second heat exchanger is defrosted and the air cooler is controlled to exchange heat to generate hot water, and the refrigerant pressure is adjusted by the ejector to avoid the problem that the high and low pressure difference on both sides of the four-way valve is large during defrosting, resulting in the failure of the four-way valve adjustment, that is, in the embodiment of the present application, the high-temperature and high-pressure refrigerant and the low-temperature and low-pressure refrigerant are mixed in the ejector to obtain medium-temperature and medium-pressure refrigerant, which is then delivered to the four-way valve, so that the pressure difference on both sides of the four-way valve is reduced, and the four-way valve is effectively controlled in the defrosting mode to control the heat pump unit to defrost.

[0044] Please refer to Figure 3 , a flowchart of a control method of a heat pump unit is provided in the embodiment of the present application. In the embodiment of the present application, the heat pump unit further comprises a third valve body connected with the second evaporator and the gas-liquid separator, as shown in Figure 3 , the method of the embodiment of the present application can include the following steps S201-S204.

[0045] S201, control to close the first valve body, and control to open the second valve body, deliver the refrigerant exchanged by the air cooler to the heat exchanger through the second valve body for heating, and deliver the high-temperature and high-pressure refrigerant heated by the heat exchanger to the ejector;

[0046] In an embodiment, when the operation mode of the air source heat pump is the defrosting mode, please refer to Figure 1B , the refrigerant separated from the gas-liquid separator is compressed into high-temperature and high-pressure refrigerant by the compressor, and then delivered to the heat exchanger. Since the operation mode of the air source heat pump is the defrosting mode at this time, the refrigerant flowing out of the air cooler needs to be heated, so when the compressor delivers the high-temperature and high-pressure refrigerant to the heat exchanger, the heat exchanger will store part of the heat of the refrigerant, so that the temperature of the high-temperature and high-pressure refrigerant delivered to the air cooler through the heat exchanger will be reduced. It can be understood that the reduction does not affect the heat exchange of the air cooler. After the heat exchange is completed, the refrigerant is output to the heat exchanger through the opened second valve body for heating to increase the temperature of the refrigerant to obtain high-temperature and high-pressure refrigerant, and finally the high-temperature and high-pressure refrigerant is delivered to the ejector.

[0047] S202, control the first evaporator to convert the liquid refrigerant output from the gas-liquid separator into low-temperature and low-pressure gaseous refrigerant;

[0048] In an embodiment, during the process of delivering the high-temperature and high-pressure refrigerant to the ejector through the second valve body, the gas-liquid separator simultaneously outputs the liquid refrigerant to the first evaporator, and the liquid refrigerant is converted into low-temperature and low-pressure gaseous refrigerant through the first evaporator.

[0049] S203, controlling the communication state of the four-way valve, delivering the gaseous refrigerant from the first evaporator to the ejector through the four-way valve, mixing the gaseous refrigerant with the high-temperature and high-pressure refrigerant to form medium-temperature and medium-pressure refrigerant, and delivering the medium-temperature and medium-pressure refrigerant to the second evaporator through the four-way valve;

[0050] In an embodiment, the low-temperature and low-pressure gaseous refrigerant converted by the first evaporator can be delivered to the ejector through the four-way valve by controlling the communication state of the four-way valve, mixed with the high-temperature and high-pressure refrigerant in the ejector to obtain medium-temperature and medium-pressure refrigerant, and output to the four-way valve through the exhaust port of the ejector, and then delivered to the second evaporator through the four-way valve, so as to increase the temperature of the second evaporator by the medium-temperature and medium-pressure refrigerant, and defrost the second evaporator.

[0051] Specifically, the first valve port and the third valve port are communicated, and the second valve port and the fourth valve port are communicated, the gaseous refrigerant is delivered from the first evaporator to the ejector through the first valve port and the third valve port, mixed with the high-temperature and high-pressure refrigerant to reduce the temperature and pressure of the high-temperature and high-pressure refrigerant, and obtain medium-temperature and medium-pressure refrigerant, and then the medium-temperature and medium-pressure refrigerant is delivered to the second evaporator through the second valve port and the fourth valve port. It can be understood that in the embodiment of the present application, by mixing the high-temperature and high-pressure refrigerant with the low-temperature and low-pressure refrigerant, the pressure of the high-temperature and high-pressure refrigerant is reduced, which can avoid the damage of the four-way valve caused by the excessively high pressure of the refrigerant.

[0052] S204, controlling the third valve body to be opened, delivering the medium-temperature and medium-pressure refrigerant from the second evaporator to the gas-liquid separator through the third valve body, the high-temperature and high-pressure refrigerant is refrigerant with a pressure at a first pressure threshold value and a temperature at a first temperature threshold value, the medium-temperature and medium-pressure refrigerant is refrigerant with a pressure at a second pressure threshold value and a temperature at a second temperature threshold value, and the low-temperature and low-pressure gaseous refrigerant is gaseous refrigerant with a pressure at a third pressure threshold value and a temperature at a third temperature threshold value;

[0053] In an embodiment, when the operation mode of the air source heat pump is the defrosting mode, the third valve body is controlled to be opened, and the refrigerant delivered through the second evaporator is delivered to the gas-liquid separator through the third valve body, and further the gaseous refrigerant separated from the gas-liquid separator is delivered to the compressor, so as to complete the refrigerant circulation in the defrosting mode.

[0054] In the embodiment of the present application, by controlling the first valve body to be closed, the second valve body and the third valve body to be opened when the heat pump unit is in the defrosting mode, and controlling the regenerator to heat the refrigerant output from the air cooler and then deliver it to the ejector, the low-temperature and low-pressure refrigerant delivered by the first heat exchanger is mixed with the high-temperature and high-pressure refrigerant in the ejector to form medium-temperature and medium-pressure refrigerant, which is then delivered to the second evaporator through the four-way valve. The connection state of each valve port of the four-way valve and the opening state of the first valve body, the second valve body and the third valve body complete the delivery process of the refrigerant when the air source heat pump is in the defrosting mode, and realize the adjustment of the refrigerant pressure by the ejector when the second heat exchanger is defrosted, thereby avoiding the problem that the high and low pressure difference on both sides of the four-way valve is large during defrosting, resulting in the failure of the four-way valve adjustment.

[0055] Please refer to Figure 4 A flowchart of a control method of a heat pump unit is provided for the embodiments of the present specification. As shown in Figure 4 The method of the embodiments of the present specification can include the following steps S301-S302.

[0056] S301, obtaining the operation mode of the heat pump unit;

[0057] S302, if the operation mode is the heating mode, controlling the second valve body to be closed and the first valve body to be opened, and delivering the refrigerant exchanged by the air cooler to the gas-liquid separator through the ejector, the four-way valve and the first evaporator.

[0058] In an embodiment, when the operation mode of the heat pump unit is the heating mode, it is determined that the refrigerant output from the air cooler does not need to be heated, the first valve body connected with the air cooler and the ejector is started, and the second valve body is closed. The medium-temperature and high-pressure refrigerant output from the air cooler is output to the ejector through the first valve body. At the same time, the liquid refrigerant in the gas-liquid separator is delivered to the second evaporator, the liquid refrigerant is converted into low-temperature and low-pressure gaseous refrigerant through the second evaporator, and then delivered to the ejector through the four-way valve. The low-temperature and low-pressure gaseous refrigerant and the medium-temperature and high-pressure refrigerant are mixed in the ejector to obtain medium-temperature and medium-pressure refrigerant, and the medium-temperature and medium-pressure refrigerant is delivered to the first evaporator, and then delivered to the gas-liquid separator, completing the circulation process of the refrigerant in the heating mode.

[0059] When the heat pump unit is in the heating mode, the first valve body is opened, the second valve body is closed, and the refrigerant output from the air cooler is delivered to the ejector through the first valve body. The low-temperature and low-pressure refrigerant delivered through the second evaporator and the four-way valve is mixed in the ejector to generate medium-temperature and medium-pressure refrigerant, which is then delivered to the gas-liquid separator through the first evaporator. The circulation of the refrigerant in the heating process is realized, the hot water is generated by the double heat source absorption of the first evaporator and the second evaporator, and the heating efficiency of the heat pump unit in the heating mode is improved.

[0060] Specifically, in the embodiment of the present application, the heat pump unit further comprises a third valve body, the third valve body is connected with the second evaporator and the gas-liquid separator respectively, and the second valve body is controlled to be closed, the first valve body is controlled to be opened, and the third valve body is controlled to be opened, so that the refrigerant exchanged in the air cooler is transported to the gas-liquid separator through the ejector, the four-way valve and the first evaporator, specifically comprising steps S3021-S3024.

[0061] S3021, the first valve body is controlled to be opened, and the second valve body is controlled to be closed, so that the medium-temperature and high-pressure refrigerant exchanged in the air cooler is transported to the ejector through the first valve body;

[0062] In an embodiment, when the operation mode of the air source heat pump is the heating mode, please refer to Figure 1C The refrigerant separated from the gas-liquid separator is compressed into high-temperature and high-pressure refrigerant by the compressor, and is transported to the heat exchanger, because the operation mode of the air source heat pump is the heating mode at this time, the heat exchanger is not needed to heat the refrigerant flowing out of the air cooler, so when the high-temperature and high-pressure refrigerant is transported to the heat exchanger by the compressor, the heat exchanger transports the high-temperature and high-pressure refrigerant to the air cooler for heat exchange. After the heat exchange is completed, the refrigerant is output to the ejector through the opened first valve body.

[0063] S3022, the third valve body is controlled to be opened, and the liquid refrigerant in the gas-liquid separator is transported to the second evaporator through the third valve body, and the second evaporator converts the liquid refrigerant into low-temperature and low-pressure gaseous refrigerant;

[0064] In an embodiment, in the process of transporting the medium-temperature and high-pressure refrigerant to the ejector through the first valve body, the third valve body of the gas-liquid separator is controlled to be opened at the same time, the liquid refrigerant is output to the second evaporator through the third valve body, and the second evaporator further converts the liquid refrigerant into low-temperature and low-pressure gaseous refrigerant.

[0065] S3023, the communication state of the four-way valve is controlled, the gaseous refrigerant is transported from the second evaporator to the ejector through the four-way valve, is mixed with the medium-temperature and high-pressure refrigerant in the ejector to become medium-temperature and medium-pressure refrigerant, and the medium-temperature and medium-pressure refrigerant is transported to the first evaporator through the four-way valve;

[0066] In an embodiment, the low-temperature and low-pressure gaseous refrigerant converted by the second evaporator can be transported to the ejector through the four-way valve by controlling the communication state of the four-way valve, is mixed with the medium-temperature and high-pressure refrigerant in the ejector to generate medium-temperature and medium-pressure refrigerant, reduces the pressure difference of the refrigerant passing through the four-way valve, and is output to the four-way valve through the exhaust port of the ejector, so that the refrigerant passing through the four-way valve is transported to the first evaporator.

[0067] Specifically, the first valve port and the second valve port are connected, the third valve port and the fourth valve port are connected, the gaseous refrigerant converted by the second evaporator is transported from the second evaporator to the ejector through the third valve port and the fourth valve port, mixed with the medium-temperature high-pressure refrigerant in the ejector to become medium-temperature medium-pressure refrigerant, and finally the medium-temperature medium-pressure refrigerant is transported to the first evaporator through the first valve port and the second valve port.

[0068] S3024, the medium-temperature medium-pressure refrigerant passing through the first evaporator is transported to the gas-liquid separator, the medium-temperature high-pressure refrigerant is the refrigerant with the pressure being the first pressure threshold value and the temperature being the second temperature threshold value, the medium-temperature medium-pressure refrigerant is the refrigerant with the pressure being the second pressure threshold value and the temperature being the second temperature threshold value, and the low-temperature low-pressure gaseous refrigerant is the gaseous refrigerant with the pressure being the third pressure threshold value and the temperature being the third temperature threshold value.

[0069] In an embodiment, in the heating mode of the air source heat pump, the refrigerant passing through the first evaporator is transported to the gas-liquid separator, and the gaseous refrigerant separated from the gas-liquid separator is further transported to the compressor to complete the refrigerant circulation in the heating mode.

[0070] In the embodiment of the present application, in the heating mode of the heat pump unit, the first valve body is opened, the second valve body is closed, the medium-pressure high-temperature refrigerant output from the air cooler is transported to the ejector through the first valve body, the medium-pressure high-temperature refrigerant is mixed with the low-temperature low-pressure refrigerant transported through the second evaporator and the four-way valve in the ejector to generate medium-temperature medium-pressure refrigerant, and then transported to the gas-liquid separator through the first evaporator to realize the refrigerant circulation in the heating process. The connection state of each valve port of the four-way valve, and the opening state of the first valve body, the second valve body and the third valve body complete the refrigerant transportation process in the heating mode of the air source heat pump, and the hot water is generated by the double heat source heat absorption of the first evaporator and the second evaporator, which improves the heating efficiency of the heat pump unit in the heating mode.

[0071] It should be noted that, in the embodiments of the present application, the high temperature refers to a temperature within a first temperature threshold, which can be greater than 28℃ for example, the medium temperature refers to a temperature within a second temperature threshold, which can be 14-28℃ for example, and the low temperature refers to a temperature within a third temperature threshold, which can be -19.5-13℃ for example; the high pressure refers to a pressure within a first pressure threshold, which can be 8-14 MPa for example, the medium pressure refers to a pressure within a second pressure threshold, which can be 5-7 MPa for example, and the low pressure refers to a pressure within a third pressure threshold, which can be 2-4 MPa for example; the first temperature threshold is greater than the second temperature threshold, the second temperature threshold is greater than the third temperature threshold, the first pressure threshold is greater than the second pressure threshold, and the second pressure threshold is greater than the third pressure threshold. When the heat pump unit is in the defrosting mode, the heat pump unit heats the refrigerant flowing out of the air cooler through the regenerator to obtain refrigerant at high temperature and high pressure (for example, the temperature is 40℃ and the pressure is 10 MPa), which is delivered to the ejector to mix with the refrigerant at low temperature and low pressure delivered from the first evaporator and the four-way valve to obtain refrigerant at medium temperature and medium pressure (for example, the temperature is 25℃ and the pressure is 6 MPa), and the temperature of the refrigerant at medium temperature and medium pressure obtained by mixing in the ejector is higher than the temperature of the refrigerant at medium temperature and medium pressure obtained by mixing in the ejector when the heat pump unit is in the heating mode. Therefore, when the refrigerant at medium temperature and medium pressure in the ejector is delivered to the second evaporator through the four-way valve in the defrosting mode, the temperature of the second evaporator can be increased to defrost the second evaporator.

[0072] It can be understood that the first temperature threshold, the second temperature threshold, the third temperature threshold, the first pressure threshold, the second pressure threshold, and the third pressure threshold are given in the ranges of values for example, and the ranges of values can be adjusted according to the operating parameters of the heat pump unit, which is not limited herein.

[0073] The serial numbers of the embodiments of the present specification are only for description, and do not represent the advantages or disadvantages of the embodiments. In some cases, the actions or steps recorded in the claims can be executed in different order from the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multi-task processing and parallel processing are possible or can be advantageous.

[0074] Please refer to Figure 5Fig. 1 shows a structural schematic diagram of a heat pump unit provided by one exemplary embodiment of the present specification. The heat pump unit in the present specification can include one or more of the following components: a processor 110, a memory 120, an input device 130, an output device 140, and a bus 150. The processor 110, the memory 120, the input device 130, and the output device 140 can be connected through the bus 150.

[0075] The processor 110 can include one or more processing cores. The processor 110 connects various parts in the entire heat pump unit through various interfaces and lines, executes various functions of the terminal 100 and processes data by running or executing instructions, programs, code sets or instruction sets stored in the memory 120, and calling data stored in the memory 120. Alternatively, the processor 110 can be implemented in at least one of hardware forms of a digital signal processing (DSP), a field-programmable gate array (FPGA), and a programmable logic array (PLA). The processor 110 can be integrated with a combination of one or more of a central processing unit (CPU), a graphics processor (GPU), and a modem. Among them, the CPU is mainly used to process operating systems, user pages, and application programs; the GPU is used to be responsible for rendering and drawing display content; and the modem is used to process wireless communication. It can be understood that the above-mentioned modem can also not be integrated into the processor 110, but be implemented separately through a communication chip.

[0076] The memory 120 can include a random access memory (RAM) and can also include a read-only memory (ROM). Optionally, the memory 120 includes a non-transitory computer-readable storage medium. The memory 120 can be used to store instructions, programs, codes, code sets, or instruction sets. The memory 120 can include a program storage area and a data storage area, where the program storage area can store instructions for implementing an operating system, instructions for implementing at least one function (such as a touch function, a sound playing function, an image playing function, etc.), instructions for implementing the various method embodiments described above, and the like, and the operating system can be an Android system, an IOS system developed by Apple Inc., a system developed based on the Android system or the IOS system, or other systems.

[0077] The memory 120 can be divided into an operating system space and a user space, where the operating system runs in the operating system space, and native and third-party applications run in the user space. In order to ensure that different third-party applications can achieve good running effects, the operating system allocates corresponding system resources to different third-party applications. However, there are also differences in the demand for system resources in different application scenarios in the same third-party application, for example, in the local resource loading scenario, the third-party application has a higher requirement for the disk reading speed; in the animation rendering scenario, the third-party application has a higher requirement for the GPU performance. However, the operating system and the third-party application are independent of each other, and the operating system often cannot timely perceive the current application scenario of the third-party application, resulting in that the operating system cannot perform targeted system resource adaptation according to the specific application scenario of the third-party application.

[0078] In order to enable the operating system to distinguish the specific application scenario of the third-party application, it is necessary to open up the data communication between the third-party application and the operating system, so that the operating system can obtain the current scenario information of the third-party application at any time, and then perform targeted system resource adaptation based on the current scenario.

[0079] The input device 130 is configured to receive input instructions or data, and the input device 130 includes but is not limited to a keyboard, a mouse, a camera, a microphone, or a touch device. The output device 140 is configured to output instructions or data, and the output device 140 includes but is not limited to a display device and a speaker. In one example, the input device 130 and the output device 140 can be combined, and the input device 130 and the output device 140 are a touch display screen.

[0080] The touch display screen can be designed as a full screen, a curved screen or a special-shaped screen. The touch display screen can also be designed as a combination of a full screen and a curved screen, a combination of a special-shaped screen and a curved screen, and the embodiments of the present application do not limit this.

[0081] In addition, those skilled in the art can understand that the structure of the heat pump unit shown in the above figure does not constitute a limitation on the heat pump unit, and the heat pump unit can include more or fewer components than the figure, or combine certain components, or different component arrangements. For example, the heat pump unit also includes radio frequency circuit, input unit, sensor, audio circuit, WiFi module, power supply, Bluetooth module and other components, which are not described here.

[0082] In Figure 5 In the heat pump unit shown, the processor 110 can be used to call the computer application stored in the memory 120, and specifically perform the following operations:

[0083] Obtain the operating mode of the heat pump unit;

[0084] If the operating mode is a defrosting mode, control to close the first valve body, open the second valve body, and the third valve body, and transport the refrigerant heated by the heat regenerator to the gas-liquid separator through the ejector, the four-way valve and the second evaporator.

[0085] In one embodiment, the processor 110, after executing the operation of obtaining the operating mode of the heat pump unit, further performs the following operation:

[0086] If the operating mode is a heating mode, control to close the second valve body, open the first valve body, and the third valve body, and transport the refrigerant exchanged by the air cooler to the gas-liquid separator through the ejector, the four-way valve and the first evaporator.

[0087] In one embodiment, the heat pump unit further comprises a third valve body connected with the second evaporator and the gas-liquid separator respectively, and the processor 110, when executing the operation of controlling to close the first valve body, open the second valve body, and transport the refrigerant heated by the heat regenerator to the gas-liquid separator through the ejector, the four-way valve and the second evaporator, specifically performs the following operation:

[0088] Control to close the first valve body, and control to open the second valve body, and transport the refrigerant exchanged by the air cooler to the heat regenerator for heating, and transport the high-temperature and high-pressure refrigerant heated by the heat regenerator to the ejector;

[0089] Control the first evaporator to convert the liquid refrigerant output from the gas-liquid separator into low-temperature and low-pressure gaseous refrigerant;

[0090] controlling the communication state of the four-way valve to transport the gaseous refrigerant from the first evaporator to the ejector through the four-way valve, mix with the high-temperature and high-pressure refrigerant to become medium-temperature and medium-pressure refrigerant, and transport the medium-temperature and medium-pressure refrigerant to the second evaporator through the four-way valve;

[0091] controlling the opening of the third valve body to transport the medium-temperature and medium-pressure refrigerant from the second evaporator to the gas-liquid separator through the third valve body, the high-temperature and high-pressure refrigerant being refrigerant with a pressure at the first pressure threshold value and a temperature at the first temperature threshold value, the medium-temperature and medium-pressure refrigerant being refrigerant with a pressure at the second pressure threshold value and a temperature at the second temperature threshold value, and the low-temperature and low-pressure gaseous refrigerant being gaseous refrigerant with a pressure at the third pressure threshold value and a temperature at the third temperature threshold value.

[0092] In one embodiment, the processor 110, in executing the control of the communication state of the four-way valve to transport the gaseous refrigerant from the first evaporator to the ejector through the four-way valve, mix with the high-temperature and high-pressure refrigerant to become medium-temperature and medium-pressure refrigerant, and transport the medium-temperature and medium-pressure refrigerant to the second evaporator through the four-way valve, specifically executes the following operations:

[0093] controlling the communication of the first valve port and the third valve port to transport the gaseous refrigerant from the first evaporator to the ejector through the first valve port and the third valve port, and mix with the high-temperature and high-pressure refrigerant to become medium-temperature and medium-pressure refrigerant;

[0094] controlling the communication of the second valve port and the fourth valve port to transport the medium-temperature and medium-pressure refrigerant to the second evaporator through the second valve port and the fourth valve port.

[0095] In one embodiment, the heat pump unit further comprises a third valve body connected with the second evaporator and the gas-liquid separator respectively, and the processor 110, in executing the control of the closing of the second valve body and the opening of the first valve body to transport the refrigerant exchanged by the air cooler to the gas-liquid separator through the ejector, the four-way valve and the first evaporator, specifically executes the following operations:

[0096] controlling the opening of the first valve body and the closing of the second valve body to transport the medium-temperature and high-pressure refrigerant exchanged by the air cooler to the ejector through the first valve body;

[0097] controlling the opening of the third valve body to transport the liquid refrigerant in the gas-liquid separator to the second evaporator through the third valve body, and controlling the second evaporator to convert the liquid refrigerant into low-temperature and low-pressure gaseous refrigerant;

[0098] controlling the communication state of the four-way valve to transport the gaseous refrigerant from the second evaporator to the ejector through the four-way valve, mix with the medium-temperature and high-pressure refrigerant to become medium-temperature and medium-pressure refrigerant, and transport the medium-temperature and medium-pressure refrigerant to the first evaporator through the four-way valve;

[0099] The medium-temperature medium-pressure refrigerant passing through the first evaporator is delivered to the gas-liquid separator, the medium-temperature high-pressure refrigerant is refrigerant with a pressure at the first pressure threshold and a temperature at the second temperature threshold, the medium-temperature medium-pressure refrigerant is refrigerant with a pressure at the second pressure threshold and a temperature at the second temperature threshold, and the low-temperature low-pressure gaseous refrigerant is gaseous refrigerant with a pressure at the third pressure threshold and a temperature at the third temperature threshold.

[0100] In one embodiment, when the processor 110 controls the communication state of the four-way valve to deliver the gaseous refrigerant from the second evaporator to the ejector through the four-way valve, mix the medium-temperature high-pressure refrigerant into the medium-temperature medium-pressure refrigerant, and deliver the medium-temperature medium-pressure refrigerant to the first evaporator through the four-way valve, the following operations are specifically performed:

[0101] The third valve port and the fourth valve port are controlled to be communicated, and the gaseous refrigerant is delivered from the second evaporator to the ejector through the third valve port and the fourth valve port, and mixed into the medium-temperature medium-pressure refrigerant with the medium-temperature high-pressure refrigerant;

[0102] The first valve port and the second valve port are controlled to be communicated, and the medium-temperature medium-pressure refrigerant is delivered to the first evaporator through the first valve port and the second valve port.

[0103] In one embodiment, the processor 110 further performs the following operations:

[0104] The compressor is controlled to compress the refrigerant output by the gas-liquid separator.

[0105] In the embodiments of the present application, the ejector, the first valve body, the second valve body, the third valve body, and the four-way valve are added to the heat pump unit. When the heat pump unit is in the defrosting mode, the first valve body is controlled to be closed, the second valve body is controlled to be opened, and the refrigerant output from the air cooler is heated by the heat exchanger and then delivered to the ejector and further delivered to the second evaporator, so that the second heat exchanger is defrosted and the air cooler is controlled to exchange heat to produce hot water. When the heat pump unit is in the heating mode, the first valve body is controlled to be opened, the second valve body is controlled to be closed, the refrigerant output from the air cooler is delivered to the ejector through the first valve body, mixed with the low-temperature low-pressure refrigerant delivered through the second evaporator and the four-way valve in the ejector to generate the medium-temperature medium-pressure refrigerant, and then delivered to the gas-liquid separator through the first evaporator, so that the refrigerant circulation in the heating process is realized, the hot water is produced by the double-heat-source heat absorption of the first evaporator and the second evaporator, and the heating efficiency of the heat pump unit in the heating mode is improved.

[0106] The embodiments of the present application also provide a computer storage medium, which can store a plurality of program instructions. The program instructions are suitable for being loaded and executed by a processor to perform the method steps of the embodiments of the above-mentioned Figures 2-4 The specific implementation process can refer to the specific description of the embodiments of the above-mentioned Figures 2-4 , and will not be described here.

[0107] In addition, the embodiments of the present specification provide a computer program product, which comprises a computer program. When the computer program is executed by a processor of a heat pump unit, the processor can at least implement the heat pump unit control method provided in the foregoing Figures 2 to 4 embodiments.

[0108] A person of ordinary skill in the art can understand that all or part of the processes in the foregoing embodiments can be completed by a computer program instructing related hardware. The foregoing program can be stored in a computer readable storage medium. When the program is executed, the program can include the processes of the foregoing embodiments. The foregoing storage medium can be a magnetic disc, an optical disc, a read-only memory (ROM), a random access memory (RAM), or the like.

[0109] The above only describes the preferred embodiments of the present specification, and of course cannot limit the scope of the rights of the present specification. Therefore, equivalent changes made according to the claims of the present specification still fall within the scope of the present specification.

Claims

1. A control method for a heat pump unit, characterized in that, An application is made in a heat pump unit, the heat pump unit comprising a gas-liquid separator, a first evaporator, a second evaporator, an ejector, a four-way valve, a regenerator, an air cooler, a first valve body, a second valve body, and a compressor. The gas-liquid separator, the compressor, the regenerator, and the air cooler are connected sequentially. The first valve body is connected to both the air cooler and the ejector. The second valve body is connected to both the air cooler and the regenerator. The ejector is connected to both the four-way valve and the regenerator. The four-way valve is connected to both the first evaporator and the second evaporator. The first evaporator is connected to the gas-liquid separator, and the second evaporator is connected to the gas-liquid separator. The method includes: Obtain the operating mode of the heat pump unit; If the operating mode is defrosting mode, the first valve body is closed and the second valve body is opened, and the refrigerant heated by the regenerator is delivered to the gas-liquid separator through the ejector, the four-way valve, and the second evaporator.

2. The method according to claim 1, characterized in that, After obtaining the operating mode of the heat pump unit, the method further includes: If the operating mode is heating mode, the second valve body is closed and the first valve body is opened, so that the refrigerant that has undergone heat exchange in the air cooler is delivered to the gas-liquid separator through the ejector, the four-way valve, and the first evaporator.

3. The method according to claim 1, characterized in that, The heat pump unit further includes a third valve body, which is connected to the second evaporator and the gas-liquid separator respectively. The control to close the first valve body and open the second valve body, delivering the refrigerant heated by the regenerator to the gas-liquid separator through the ejector, the four-way valve, and the second evaporator, includes: The system controls the closure of the first valve body and the opening of the second valve body, so that the refrigerant after heat exchange in the air cooler is delivered to the regenerator through the second valve body for heating, and the high-temperature and high-pressure refrigerant after heating in the regenerator is delivered to the ejector. The first evaporator is controlled to convert the liquid refrigerant output from the gas-liquid separator into a low-temperature, low-pressure gaseous refrigerant; Controlling the connection state of the four-way valve, the gaseous refrigerant is transported from the first evaporator to the ejector through the four-way valve, where it is mixed with the high-temperature and high-pressure refrigerant to form a medium-temperature and medium-pressure refrigerant, and the medium-temperature and medium-pressure refrigerant is transported to the second evaporator through the four-way valve; The control opens the third valve body, through which the medium-temperature and medium-pressure refrigerant is transported from the second evaporator to the gas-liquid separator. The high-temperature and high-pressure refrigerant is a refrigerant with a pressure at a first pressure threshold and a temperature at a first temperature threshold. The medium-temperature and medium-pressure refrigerant is a refrigerant with a pressure at a second pressure threshold and a temperature at a second temperature threshold. The low-temperature and low-pressure gaseous refrigerant is a gaseous refrigerant with a pressure at a third pressure threshold and a temperature at a third temperature threshold.

4. The method according to claim 3, characterized in that, The four-way valve includes a first valve port, a second valve port, a third valve port, and a fourth valve port. Controlling the connection state of the four-way valve to deliver the gaseous refrigerant from the first evaporator to the ejector via the four-way valve, mixing it with the high-temperature, high-pressure refrigerant to form a medium-temperature, medium-pressure refrigerant, and then delivering the medium-temperature, medium-pressure refrigerant to the second evaporator via the four-way valve includes: The control connects the first valve port and the third valve port, and the gaseous refrigerant is delivered from the first evaporator to the ejector through the first valve port and the third valve port, where it is mixed with the high-temperature and high-pressure refrigerant to form a medium-temperature and medium-pressure refrigerant. The control connects the second valve port and the fourth valve port, and delivers the medium-temperature and medium-pressure refrigerant to the second evaporator through the second valve port and the fourth valve port.

5. The method according to claim 2, characterized in that, The heat pump unit further includes a third valve body, which is connected to the second evaporator and the gas-liquid separator respectively. The control mechanism closes the second valve body and opens the first valve body, delivering the refrigerant that has undergone heat exchange in the air cooler to the gas-liquid separator through the ejector, the four-way valve, and the first evaporator. This includes: The system controls the opening of the first valve body and the closing of the second valve body to deliver the medium-temperature, high-pressure refrigerant, which has undergone heat exchange in the air cooler, to the ejector through the first valve body. The third valve is opened to deliver the liquid refrigerant in the gas-liquid separator to the second evaporator, and the second evaporator is controlled to convert the liquid refrigerant into a low-temperature, low-pressure gaseous refrigerant. Controlling the connection state of the four-way valve, the gaseous refrigerant is transported from the second evaporator to the ejector through the four-way valve, mixed with the medium-temperature and high-pressure refrigerant to form a medium-temperature and medium-pressure refrigerant, and the medium-temperature and medium-pressure refrigerant is transported to the first evaporator through the four-way valve; The medium-temperature, medium-pressure refrigerant passing through the first evaporator is delivered to the gas-liquid separator. The medium-temperature, high-pressure refrigerant is a refrigerant with a pressure at a first pressure threshold and a temperature at a second temperature threshold. The medium-temperature, medium-pressure refrigerant is a refrigerant with a pressure at a second pressure threshold and a temperature at a second temperature threshold. The low-temperature, low-pressure gaseous refrigerant is a gaseous refrigerant with a pressure at a third pressure threshold and a temperature at a third temperature threshold.

6. The method according to claim 5, characterized in that, The four-way valve includes a first valve port, a second valve port, a third valve port, and a fourth valve port. Controlling the connection state of the four-way valve to deliver the gaseous refrigerant from the second evaporator to the ejector via the four-way valve, mixing it with the medium-temperature, high-pressure refrigerant to form a medium-temperature, medium-pressure refrigerant, and then delivering the medium-temperature, medium-pressure refrigerant to the first evaporator via the four-way valve includes: The control connects the third valve port and the fourth valve port, and the gaseous refrigerant is delivered from the second evaporator to the ejector through the third valve port and the fourth valve port, where it is mixed with the medium-temperature and high-pressure refrigerant to form a medium-temperature and medium-pressure refrigerant. The control connects the first valve port and the second valve port, and delivers the medium-temperature and medium-pressure refrigerant to the first evaporator through the first valve port and the second valve port.

7. A heat pump unit, characterized in that, The heat pump unit includes a gas-liquid separator, a first evaporator, a second evaporator, an ejector, a four-way valve, a regenerator, an air cooler, a first valve body, a second valve body, a processor, and a compressor. The gas-liquid separator, the compressor, the regenerator, and the air cooler are connected sequentially. The first valve body is connected to both the air cooler and the ejector. The second valve body is connected to both the air cooler and the regenerator. The ejector is connected to both the four-way valve and the regenerator. The four-way valve is connected to both the first and second evaporators. The first evaporator is connected to the gas-liquid separator. The processor is connected to the four-way valve, the first valve body, and the second valve body. The first evaporator is used to convert the refrigerant from a liquid state to a gaseous state; The second evaporator is used to convert the refrigerant from a liquid state to a gaseous state; The gas-liquid separator is used to separate liquid refrigerant and gaseous refrigerant; The regenerator is used to heat the refrigerant; The air cooler is used to exchange heat with the refrigerant to produce hot water; The ejector is used to mix the refrigerant; The four-way valve, the first valve body, and the second valve body are used to control the flow of refrigerant; The processor is used to obtain the operating mode of the heat pump unit; if the operating mode is defrosting mode, it controls the first valve body to close and the second valve body to open, so that the refrigerant heated by the regenerator is delivered to the gas-liquid separator through the ejector, the four-way valve and the second evaporator.

8. The heat pump unit according to claim 7, characterized in that, The four-way valve includes a first valve port, a second valve port, a third valve port, and a fourth valve port. When the heat pump unit is in defrost mode, the first valve port is connected to the third valve port, and the low-temperature and low-pressure gaseous refrigerant is transported from the first evaporator to the ejector through the first valve port and the third valve port, and mixed with the high-temperature and high-pressure refrigerant in the ejector to form a medium-temperature and medium-pressure refrigerant. The second valve port is connected to the fourth valve port. The medium-temperature and medium-pressure refrigerant is delivered from the ejector to the second evaporator through the second valve port and the fourth valve port. The high-temperature and high-pressure refrigerant is a refrigerant with a pressure at a first pressure threshold and a temperature at a first temperature threshold. The medium-temperature and medium-pressure refrigerant is a refrigerant with a pressure at a second pressure threshold and a temperature at a second temperature threshold. The low-temperature and low-pressure gaseous refrigerant is a gaseous refrigerant with a pressure at a third pressure threshold and a temperature at a third temperature threshold.

9. The heat pump unit according to claim 7, characterized in that, The four-way valve further includes a first valve port, a second valve port, a third valve port, and a fourth valve port. When the heat pump unit is in heating mode, the third valve port is connected to the fourth valve port, and the low-temperature and low-pressure gaseous refrigerant is transported from the second evaporator to the ejector through the third valve port and the fourth valve port, and mixes with the medium-temperature and high-pressure refrigerant in the ejector to form a medium-temperature and medium-pressure refrigerant. The first valve port is connected to the second valve port. The medium-temperature and medium-pressure refrigerant is delivered from the ejector to the first evaporator through the first valve port and the second valve port. The medium-temperature and high-pressure refrigerant is a refrigerant with a pressure at a first pressure threshold and a temperature at a second temperature threshold. The medium-temperature and medium-pressure refrigerant is a refrigerant with a pressure at a second pressure threshold and a temperature at a second temperature threshold. The low-temperature and low-pressure gaseous refrigerant is a gaseous refrigerant with a pressure at a third pressure threshold and a temperature at a third temperature threshold.

10. The heat pump unit according to claim 9, characterized in that, The ejector includes a high-pressure inlet, a low-pressure inlet, and an exhaust port. The high-pressure inlet is connected to the first valve body and the regenerator, respectively, and the low-pressure inlet and the exhaust port are connected to the four-way valve, respectively.

11. The heat pump unit according to claim 7, characterized in that, The heat pump unit also includes a third valve body, which is connected to the second evaporator, the gas-liquid separator, and the processor. The third valve body is used to control the flow of refrigerant.

12. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed, implements the method as described in any one of claims 1 to 6.

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