Heat pump unit control method and heat pump unit

Abstract

The invention discloses a heat pump unit control method and a heat pump unit, and relates to the technical field of heat pump units, and the heat pump unit comprises a compressor, an outdoor heat exchanger, a water fluorine heat exchanger, a first four-way valve and a second four-way valve. The heat pump unit control method comprises the steps that whether the current operation mode of a heat pump unit is a refrigeration mode or a heating mode is obtained, and the first real-time temperature of water at a water inlet and the second real-time temperature of water at a water outlet are obtained; and according to the current operation mode of the heat pump unit and the comparison result of the first real-time temperature and the second real-time temperature, the first four-way valve is controlled to be switched to be in the first state or the second state, so that the flowing direction of a refrigerant in the heat exchange pipe can be kept opposite to the flowing direction of water in the waterway pipe. No matter whether the heat pump unit is in a refrigeration mode or a heating mode or whether the waterway pipe is installed mistakenly or reversely, the heat pump unit can be always in the countercurrent flow heat exchange state, and then the heat exchange effect of the heat pump unit can be ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pump units, and in particular to a heat pump unit control method and a heat pump unit. Background Art

[0002] A heat pump unit is a device that can use the heat energy in natural air for heating or cooling. The water-fluorine heat exchanger is the core equipment in the heat pump unit. Its working principle is based on the principle of heat conduction. When water flows through the heat exchanger, it exchanges heat with the refrigerant, thereby achieving the purpose of cooling or heating the water. In the prior art, the installation of heat pump units is generally undertaken by a third-party installation company in the user's local area. The installation process and level are uneven, and low-level errors such as reverse connection of water pipes are prone to occur. Because the flow direction of the water in the user's home is constant, the heat pump unit cannot always be in a countercurrent heat exchange state, which reduces the heat exchange effect of the heat pump unit. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a heat pump unit control method and a heat pump unit, which can ensure the heat exchange effect of the heat pump unit.

[0004] In a first aspect, a heat pump unit control method is provided according to an embodiment of the present invention, characterized in that it is applied to a heat pump unit, wherein the heat pump unit comprises a compressor, an outdoor heat exchanger, a water-fluorine heat exchanger, a first four-way valve and a second four-way valve, the water-fluorine heat exchanger comprises a water pipe and a heat exchange pipe, the water pipe has a water inlet and a water outlet, and the first four-way valve has a first state and a second state.

[0005] The heat pump unit control method includes presetting a working time threshold; after the heat pump unit is started and runs the working time threshold, obtaining whether the current operating mode of the heat pump unit is the cooling mode or the heating mode, obtaining the first real-time temperature of the water at the water inlet and the second real-time temperature of the water at the water outlet, and obtaining the current state of the first four-way valve; according to the current operating mode of the heat pump unit, according to the comparison result of the first real-time temperature and the second real-time temperature, according to the current state of the first four-way valve, controlling the first four-way valve to switch to the first state or the second state, so that the flow direction of the refrigerant in the heat exchange tube can be kept opposite to the flow direction of water in the water pipe.

[0006] At least the following beneficial effects:

[0007] After the user turns on the heat pump unit, the heat pump unit starts to run. After the heat pump unit reaches the operating time threshold, it obtains the current operating mode of the heat pump unit, and obtains the first real-time temperature of the water inlet of the water pipe and the second real-time temperature of the water outlet of the water pipe. According to whether the heat pump unit is currently operating in cooling mode or heating mode, and according to the comparison result of the first real-time temperature and the second real-time temperature, the first four-way valve is controlled to switch to the first state, or the first four-way valve is controlled to switch to the second state, so that the flow direction of the refrigerant in the heat exchange tube can always be opposite to the flow direction of the water in the water pipe, so that the heat pump unit can always be in a countercurrent heat exchange state regardless of whether it is in cooling mode or heating mode, and regardless of whether the water pipe is installed incorrectly or reversely, thereby ensuring the heat exchange effect of the heat pump unit.

[0008] In one embodiment of the present invention, if the current operating mode of the heat pump unit is the cooling mode, the first real-time temperature and the second real-time temperature are obtained, and it is determined whether the first real-time temperature and the second real-time temperature meet a first condition, wherein the first condition is that the first real-time temperature is greater than the second real-time temperature; if the first real-time temperature and the second real-time temperature do not meet the first condition, it is determined whether the first four-way valve meets a second condition, wherein the second condition is that the first four-way valve is in the first state; if the first four-way valve meets the second condition, the compressor is controlled to reduce the operating frequency, and the first four-way valve is controlled to switch to the second state.

[0009] In one embodiment of the present invention, if the first four-way valve does not satisfy the second condition, the first four-way valve is maintained in the second state.

[0010] In one embodiment of the present invention, if the first real-time temperature and the second real-time temperature meet the first condition, it is determined whether the first four-way valve meets the second condition; if the first four-way valve does not meet the second condition, the compressor is controlled to reduce the operating frequency, and the first four-way valve is controlled to switch to the first state.

[0011] In one embodiment of the present invention, if the first four-way valve satisfies the second condition, the first four-way valve is maintained in the first state.

[0012] In one embodiment of the present invention, if the current operating mode of the heat pump unit is the heating mode, the first real-time temperature and the second real-time temperature are obtained, and it is determined whether the first real-time temperature and the second real-time temperature meet a third condition, wherein the third condition is that the first real-time temperature is less than the second real-time temperature; if the first real-time temperature and the second real-time temperature do not meet the third condition, it is determined whether the first four-way valve meets a fourth condition, wherein the fourth condition is that the first four-way valve is in the second state; if the first four-way valve meets the fourth condition, the compressor is controlled to reduce the operating frequency, and the first four-way valve is controlled to switch to the first state.

[0013] In one embodiment of the present invention, if the first four-way valve does not satisfy the fourth condition, the first four-way valve is maintained in the first state.

[0014] In one embodiment of the present invention, if the first real-time temperature and the second real-time temperature satisfy the third condition, it is determined whether the first four-way valve satisfies the fourth condition; if the first four-way valve does not satisfy the fourth condition, the compressor is controlled to reduce the operating frequency, and the first four-way valve is controlled to switch to the second state.

[0015] In one embodiment of the present invention, if the first four-way valve satisfies the fourth condition, the first four-way valve is maintained in the second state.

[0016] In a second aspect, an embodiment of the present invention provides a heat pump unit, comprising a control device, the control device comprising a processor and a memory, the processor being connected to the memory, the processor being used to call and execute a program stored in the memory, the memory being used to store the program, and the program being used at least to execute the heat pump unit control method described in the first aspect above.

[0017] At least the following beneficial effects:

[0018] The heat pump unit can always be in a countercurrent heat exchange state, which can ensure the heat exchange effect of the heat pump unit.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0021] Figure 1 It is a schematic diagram of a water-fluorine heat exchanger in a heat pump unit according to an embodiment of the present invention in a countercurrent heat exchange state;

[0022] Figure 2 It is a schematic diagram of a water-fluorine heat exchanger in a heat pump unit according to an embodiment of the present invention in a downstream heat exchange state;

[0023] Figure 3 It is a schematic diagram of refrigerant flow when the heat pump unit according to the embodiment of the present invention is in a cooling state and the first four-way valve is in a first state;

[0024] Figure 4 It is a schematic diagram of refrigerant flow when the heat pump unit according to the embodiment of the present invention is in a cooling state and the first four-way valve is in a second state;

[0025] Figure 5 It is a schematic diagram of refrigerant flow when the heat pump unit according to the embodiment of the present invention is in a heating state and the first four-way valve is in a first state;

[0026] Figure 6 It is a schematic diagram of refrigerant flow when the heat pump unit according to the embodiment of the present invention is in a heating state and the first four-way valve is in a second state;

[0027] Figure 7 A schematic flow chart of a heat pump unit control method provided by one embodiment of the present invention;

[0028] Figure 8 A logic diagram of a heat pump unit control method provided by an embodiment of the present invention;

[0029] Fig. 9 It is a schematic diagram of the refrigerant flow when the heat pump unit according to an embodiment of the present invention is in cooling mode, the water pipes are installed reversely, and the first four-way valve is in the second state;

[0030] Fig.10 It is a schematic diagram of refrigerant flow when the heat pump unit according to an embodiment of the present invention is in cooling mode, the water pipes are correctly installed, and the first four-way valve is in the first state;

[0031] Fig.11 It is a schematic diagram of refrigerant flow when the heat pump unit according to an embodiment of the present invention is in heating mode, the water pipes are installed reversely, and the first four-way valve is in the first state;

[0032] Fig.12 It is a schematic diagram of the refrigerant flow when the heat pump unit according to the embodiment of the present invention is in the cooling mode, the water pipes are correctly installed, and the first four-way valve is in the second state;

[0033] Reference numerals:

[0034] A first four-way valve 100; a second four-way valve 200;

[0035] Water-fluorine heat exchanger 300; water pipe 310; water inlet 311; water outlet 312; heat exchange pipe 320;

[0036] Compressor 400; outdoor heat exchanger 500; expansion valve 600. DETAILED DESCRIPTION

[0037] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0038] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0039] In the description of the present invention, "a plurality" means more than two. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0040] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0041] It should be explained that the reference Figure 1 and Figure 2 , the arrows in the figure indicate the flow direction of the refrigerant and water. The water-fluorine heat exchanger 300 includes a water pipe 310 and a heat exchange pipe 320. The water in the water pipe 310 can exchange heat with the refrigerant in the heat exchange pipe 320. Figure 1 , countercurrent heat exchange means that the flow direction of water in the water pipe 310 is opposite to the flow direction of the refrigerant in the heat exchange pipe 320. Figure 2 , co-current heat exchange means that the flow direction of water in the water pipe 310 is the same as the flow direction of the refrigerant in the heat exchange tube 320. In the countercurrent heat exchange mode, when the heat of the refrigerant is transferred to the water, their contact surfaces always maintain a large temperature difference, which can improve the heat transfer efficiency, that is, improve the heat exchange effect of the water-fluorine heat exchanger 300 and the heat pump unit. In the co-current heat exchange mode, the temperature difference between the refrigerant and the water gradually decreases with the flow of the refrigerant and the water, resulting in a low heat exchange efficiency, that is, reducing the heat exchange effect of the water-fluorine heat exchanger 300 and the heat pump unit. Therefore, in order to ensure the heat exchange effect of the heat pump unit, it is necessary to ensure that the water pipe 310 and the heat exchange tube 320 are always in countercurrent heat exchange.

[0042] In the embodiment of the present invention, the water pipe 310 has a water inlet 311 and a water outlet 312, and the heat exchange tube 320 has a first end and a second end. The water inlet 311 is arranged corresponding to the first end of the heat exchange tube 320, and the water outlet 312 is arranged corresponding to the second end of the heat exchange tube 320. When the water pipe 310 is installed correctly and not reversed, the flow direction of water in the water pipe 310 is from the water inlet 311 to the water outlet 312. If the flow direction of the refrigerant in the heat exchange tube 320 is from the second end of the heat exchange tube 320 to the first end of the heat exchange tube 320 at this time, it is countercurrent heat exchange; if the flow direction of the refrigerant in the heat exchange tube 320 is from the first end of the heat exchange tube 320 to the second end of the heat exchange tube 320 at this time, it is cocurrent heat exchange.

[0043] When the water pipe 310 is installed incorrectly or upside down, the flow direction of water in the water pipe 310 is from the water outlet 312 to the water inlet 311. If the flow direction of the refrigerant in the heat exchange tube 320 is from the second end of the heat exchange tube 320 to the first end of the heat exchange tube 320 at this time, it is co-current heat exchange; if the flow direction of the refrigerant in the heat exchange tube 320 is from the first end of the heat exchange tube 320 to the second end of the heat exchange tube 320 at this time, it is countercurrent heat exchange.

[0044] The embodiment of the present invention provides a heat pump unit control method, which is applied to a heat pump unit, referring to Figures 3 to 6 The heat pump unit includes a compressor 400, an outdoor heat exchanger 500, a water-fluorine heat exchanger 300, a first four-way valve 100 and a second four-way valve 200. The water-fluorine heat exchanger 300 includes a water pipe 310 and a heat exchange pipe 320. The water pipe 310 has a water inlet 311 and a water outlet 312. The heat exchange pipe 320 has a first end and a second end. The water inlet 311 is arranged corresponding to the first end of the heat exchange pipe 320, and the water outlet 312 is arranged corresponding to the second end of the heat exchange pipe 320. A loop for the flow of refrigerant is formed between the compressor 400, the heat exchange pipe 320 and the outdoor heat exchanger 500. The second four-way valve 200 is arranged on the loop. The second four-way valve 200 is used to change the flow direction of the refrigerant in the loop so that the heat pump unit operates in a cooling mode or a heating mode. The first four-way valve 100 is arranged on the loop. The first four-way valve 100 has a first state and a second state.

[0045] When the heat pump unit operates in the cooling mode and the first four-way valve 100 is in the first state, the flow direction of the refrigerant in the heat exchange tube 320 is from the second end of the heat exchange tube 320 to the first end of the heat exchange tube 320. When the heat pump unit operates in the cooling mode and the first four-way valve 100 is in the second state, the flow direction of the refrigerant in the heat exchange tube 320 is from the first end of the heat exchange tube 320 to the second end of the heat exchange tube 320.

[0046] When the heat pump unit operates in the heating mode and the first four-way valve 100 is in the first state, the flow direction of the refrigerant in the heat exchange tube 320 is from the first end of the heat exchange tube 320 to the second end of the heat exchange tube 320. When the heat pump unit operates in the heating mode and the first four-way valve 100 is in the second state, the flow direction of the refrigerant in the heat exchange tube 320 is from the second end of the heat exchange tube 320 to the first end of the heat exchange tube 320.

[0047] refer to Figure 7 The heat pump unit control method includes presetting a working time threshold, and after the heat pump unit is started and runs at the working time threshold, obtaining whether the current operating mode of the heat pump unit is a cooling mode or a heating mode, obtaining the first real-time temperature of the water at the water inlet 311 and the second real-time temperature of the water at the water outlet 312, and obtaining the current state of the first four-way valve 100; according to the current operating mode of the heat pump unit, according to the comparison result of the first real-time temperature and the second real-time temperature, according to the current state of the first four-way valve 100, controlling the first four-way valve 100 to switch to the first state or the second state, so that the flow direction of the refrigerant in the heat exchange tube 320 can be kept opposite to the flow direction of the water in the water pipe 310.

[0048] refer to Figures 3 to 6 A loop for the flow of refrigerant is formed between the compressor 400, the heat exchange tube 320 and the outdoor heat exchanger 500. The second four-way valve 200 is arranged on the loop. The second four-way valve 200 can change the flow direction of the refrigerant in the loop, so that the refrigerant flowing out of the exhaust end of the compressor 400 can first flow through the heat exchange tube 320 and then flow through the outdoor heat exchanger 500, or the refrigerant flowing out of the exhaust end of the compressor 400 can first flow through the outdoor heat exchanger 500 and then flow through the heat exchange tube 320. When the refrigerant flowing out of the exhaust end of the compressor 400 first flows through the outdoor heat exchanger 500 and then flows through the heat exchange tube 320, the refrigerant releases heat in the outdoor heat exchanger 500 and absorbs heat in the heat exchange tube 320, that is, the heat pump unit is in the cooling mode at this time. When the refrigerant flowing out of the exhaust end of the compressor 400 first flows through the heat exchange tube 320 and then flows through the outdoor heat exchanger 500, the refrigerant releases heat in the heat exchange tube 320 and absorbs heat in the outdoor heat exchanger 500, that is, the heat pump unit is in the heating mode at this time. When the heat pump unit is in the cooling mode, the refrigerant absorbs heat in the heat exchange tube 320, so that the temperature of the water in the water pipe 310 decreases. When the heat pump unit is in the heating mode, the refrigerant releases heat in the heat exchange tube 320, so that the temperature of the water in the water pipe 310 increases.

[0049] In the embodiment of the present invention, the first four-way valve 100 has two states, namely a first state and a second state. The first four-way valve 100 is used to change the flow direction of the refrigerant in the heat exchange tube 320. Figure 3 and Figure 4When the heat pump unit is in cooling mode and the first four-way valve 100 is in the first state, the flow direction of the refrigerant in the heat exchange tube 320 is from the second end of the heat exchange tube 320 to the first end of the heat exchange tube 320. When the heat pump unit is in cooling mode and the first four-way valve 100 is in the second state, the flow direction of the refrigerant in the heat exchange tube 320 is from the first end of the heat exchange tube 320 to the second end of the heat exchange tube 320. Figure 5 and Figure 6 When the heat pump unit is in the heating mode and the first four-way valve 100 is in the first state, the flow direction of the refrigerant in the heat exchange tube 320 is from the first end of the heat exchange tube 320 to the second end of the heat exchange tube 320. When the heat pump unit is in the heating mode and the first four-way valve 100 is in the second state, the flow direction of the refrigerant in the heat exchange tube 320 is from the second end of the heat exchange tube 320 to the first end of the heat exchange tube 320.

[0050] In the embodiment of the present invention, the heat pump unit further includes a first temperature sensor and a second temperature sensor, wherein the first temperature sensor is used to detect the temperature of water at the water inlet 311 of the water pipe 310 to obtain a first real-time temperature, and the second temperature sensor is used to detect the temperature of water at the water outlet 312 of the water pipe 310 to obtain a second real-time temperature.

[0051] It is understandable that after the user turns on the heat pump unit, the heat pump unit starts to run. After the heat pump unit reaches the operating time threshold, the current operating mode of the heat pump unit is obtained, and the first real-time temperature of the water inlet 311 of the water pipe 310 and the second real-time temperature of the water outlet 312 of the water pipe 310 are obtained. According to whether the heat pump unit is currently operating in cooling mode or heating mode, and according to the comparison result of the first real-time temperature and the second real-time temperature, the first four-way valve 100 is controlled to switch to the first state, or the first four-way valve 100 is controlled to switch to the second state, so that the flow direction of the refrigerant in the heat exchange tube 320 can always be opposite to the flow direction of the water in the water pipe 310, so that the heat pump unit can always be in a countercurrent heat exchange state regardless of whether it is in cooling mode or heating mode, and regardless of whether the water pipe 310 is installed incorrectly or reversely, so as to ensure the heat exchange effect of the heat pump unit.

[0052] refer to Figure 7 FIG. 7 is a flow chart of a heat pump unit control method provided by an embodiment of the present invention. The heat pump unit control method includes but is not limited to the following steps:

[0053] Step S11, after the heat pump unit is started and runs for a working time threshold, the current operating mode of the heat pump unit is obtained, the first real-time temperature of the water at the water inlet 311 and the second real-time temperature of the water at the water outlet 312 are obtained, and the current state of the first four-way valve 100 is obtained.

[0054] It should be explained that after the user controls the heat pump unit to enter the heating mode or the cooling mode, the timing module starts timing. When the time recorded by the timing module is equal to the working time threshold, the heat pump unit obtains whether the current operating mode is the cooling mode or the cooling mode. At the same time, the first temperature sensor detects the first real-time temperature of the water at the water inlet 311, and the second temperature sensor detects the second real-time temperature of the water at the water outlet 312.

[0055] Step S12, according to the current operation mode of the heat pump unit and the comparison result between the first real-time temperature and the second real-time temperature, the first four-way valve 100 is controlled to switch to the first state or the second state.

[0056] It should be explained that the controller will control the switching state of the first four-way valve 100 only when the heat pump unit is in the corresponding operating mode and the comparison between the first real-time temperature and the second real-time temperature meets the corresponding conditions, so that the flow direction of the refrigerant in the heat exchange tube 320 can be kept opposite to the flow direction of the water in the water pipe 310.

[0057] In the embodiment of the present invention, after the heat pump unit is started and runs the working time threshold, the temperature of the water at the water inlet 311 and the water outlet 312 tends to be stable, so that the first real-time temperature and the second real-time temperature obtained are more accurate, which is conducive to improving the detection accuracy of the heat pump unit control method. As a preferred embodiment of the present invention, the working time threshold can be 8 minutes.

[0058] In the embodiment of the present invention, the first four-way valve 100 has a C1 interface, an S1 interface, an E1 interface and a D1 interface, and the second four-way valve 200 has a C2 interface, an S2 interface, an E2 interface and a D2 interface. The D1 interface is connected to the E2 interface, the S1 interface is connected to the first end of the outdoor heat exchanger 500, the E1 interface is connected to the second end of the heat exchange pipe 320, and the C1 interface is connected to the first end of the heat exchange pipe 320. The exhaust end of the compressor 400 is connected to the D2 interface, the suction pipe of the compressor 400 is connected to the S2 interface, the E2 interface is connected to the D1 interface, and the C1 interface is connected to the second end of the outdoor heat exchanger 500.

[0059] refer to Figure 3, when the heat pump unit is in cooling mode and the first four-way valve 100 is in the first state, the D2 interface in the second four-way valve 200 is connected to the C2 interface, and the E2 interface is connected to the S2 interface; the D1 interface in the first four-way valve 100 is connected to the C1 interface, and the E1 interface is connected to the S1 interface. The refrigerant flowing out from the exhaust end of the compressor 400 first flows into the second end of the outdoor heat exchanger 500 through the D2 interface and the C2 interface. The refrigerant in the outdoor heat exchanger 500 flows out from the first end of the outdoor heat exchanger 500 and flows into the second end of the heat exchange tube 320 through the S1 interface and the E1 interface. The refrigerant in the heat exchange tube 320 flows out from the first end of the heat exchange tube 320 and flows into the suction end of the compressor 400 through the C1 interface, the D1 interface, the E2 interface and the S2 interface. At this time, the flow direction of the refrigerant in the heat exchange tube 320 is from the second end of the heat exchange tube 320 to the first end of the heat exchange tube 320.

[0060] refer to Figure 4 , when the heat pump unit is in cooling mode and the first four-way valve 100 is in the second state, the D2 interface in the second four-way valve 200 is connected to the C2 interface, and the E2 interface is connected to the S2 interface; the D1 interface in the first four-way valve 100 is connected to the E1 interface, and the C1 interface is connected to the S1 interface. The refrigerant flowing out from the exhaust end of the compressor 400 first flows into the second end of the outdoor heat exchanger 500 through the D2 interface and the C2 interface. The refrigerant in the outdoor heat exchanger 500 flows out from the first end of the outdoor heat exchanger 500 and flows into the first end of the heat exchange tube 320 through the S1 interface and the C1 interface. The refrigerant in the heat exchange tube 320 flows out from the second end of the heat exchange tube 320 and flows into the suction end of the compressor 400 through the E1 interface, the D1 interface, the E2 interface and the S2 interface. At this time, the flow direction of the refrigerant in the heat exchange tube 320 is from the first end of the heat exchange tube 320 to the second end of the heat exchange tube 320.

[0061] refer to Figure 5 , when the heat pump unit is in the heating mode and the first four-way valve 100 is in the first state, the D2 interface in the second four-way valve 200 is connected to the E2 interface, and the S2 interface is connected to the C2 interface; the D1 interface in the first four-way valve 100 is connected to the C1 interface, and the E1 interface is connected to the S1 interface. The refrigerant flowing out from the exhaust end of the compressor 400 flows into the first end of the heat exchange tube 320 through the D2 interface, the E2 interface, the D1 interface and the C1 interface, and the refrigerant in the heat exchange tube 320 flows out from the second end of the heat exchange tube 320 and flows into the first end of the outdoor heat exchanger 500 through the E1 interface and the S1 interface. The refrigerant in the outdoor heat exchanger 500 flows out from the second end of the outdoor heat exchanger 500 and flows into the suction end of the compressor 400 through the C2 interface and the S2 interface. At this time, the flow direction of the refrigerant in the heat exchange tube 320 is from the first end of the heat exchange tube 320 to the second end of the heat exchange tube 320.

[0062] refer to Figure 6, when the heat pump unit is in the heating mode and the first four-way valve 100 is in the second state, the D2 interface in the second four-way valve 200 is connected to the E2 interface, and the S2 interface is connected to the C2 interface; the D1 interface in the first four-way valve 100 is connected to the E1 interface, and the S1 interface is connected to the C1 interface. The refrigerant flowing out from the exhaust end of the compressor 400 flows into the second end of the heat exchange tube 320 through the D2 interface, the E2 interface, the D1 interface and the E1 interface, and the refrigerant in the heat exchange tube 320 flows out from the first end of the heat exchange tube 320 and flows into the first end of the outdoor heat exchanger 500 through the S1 interface and the C1 interface. The refrigerant in the outdoor heat exchanger 500 flows out from the second end of the outdoor heat exchanger 500 and flows into the suction end of the compressor 400 through the C2 interface and the S2 interface. At this time, the flow direction of the refrigerant in the heat exchange tube 320 is from the second end of the heat exchange tube 320 to the first end of the heat exchange tube 320.

[0063] In the embodiment of the present invention, the second four-way valve 200 is mainly used to change the flow direction of the refrigerant between the water-fluorine heat exchanger 300, the compressor 400 and the outdoor heat exchanger 500, so that the heat pump unit can be in cooling mode and heating mode. The second four-way valve 200 is a common four-way valve in the heat pump unit, and will not be further described here.

[0064] refer to Figure 8 and Fig. 9 In one embodiment, if the current operating mode of the heat pump unit is the cooling mode, the first real-time temperature and the second real-time temperature are obtained, and it is determined whether the first real-time temperature and the second real-time temperature meet the first condition, wherein the first condition is that the first real-time temperature is greater than the second real-time temperature; if the first real-time temperature and the second real-time temperature do not meet the first condition, it is determined whether the first four-way valve 100 meets the second condition, wherein the second condition is that the first four-way valve 100 is in the first state; if the first four-way valve 100 meets the second condition, the compressor 400 is controlled to reduce the operating frequency, and the first four-way valve 100 is controlled to switch to the second state.

[0065] The first real-time temperature can be expressed as T1, and the second real-time temperature can be expressed as T2. When the current operating mode of the heat pump unit is obtained as the cooling mode, T1 and T2 are obtained, and it is determined whether the first condition is met, wherein the first condition is T1>T2. It can be understood that when the heat pump unit is in the cooling mode, the refrigerant in the heat exchange tube 320 will absorb the heat of the water in the water pipe 310, so that the temperature of the water in the water pipe 310 gradually decreases along the flow direction of the water, that is, when the heat pump unit is in the cooling mode and the water pipe 310 is installed correctly (not reversed), the flow direction of the water in the water pipe 310 is from the water inlet 311 to the water outlet 312, and T1 should be greater than T2.

[0066] If and do not meet the first condition, that is, T1≤T2, it means that the first real-time temperature of the water at the water inlet 311 is less than or equal to the second real-time temperature of the water at the water outlet 312, which means that the current flow direction of the water in the water pipe 310 is from the water outlet 312 to the water inlet 311, which means that the current water pipe 310 is installed incorrectly (reversely). If T1 and T2 do not meet the first condition, it is determined whether the first four-way valve 100 meets the second condition, wherein the second condition is that the first four-way valve 100 is in the first state.

[0067] If the first four-way valve 100 meets the second condition, the first four-way valve 100 is currently in the first state. When the first four-way valve 100 is in the first state, the flow direction of the refrigerant in the heat exchange tube 320 is from the second end of the heat exchange tube 320 to the first end of the heat exchange tube 320, because the water inlet 311 is corresponding to the first end of the heat exchange tube 320 and the water outlet 312 is corresponding to the second end of the heat exchange tube 320, and because the flow direction of the water in the water pipe 310 at this time is from the water outlet 312 to the water inlet 311, the flow direction of the refrigerant in the heat exchange tube 320 is the same as the flow direction of the water in the water pipe 310, that is, the heat pump unit is in a downstream heat exchange state at this time. If the first four-way valve 100 meets the second condition, the compressor 400 is controlled to reduce the operating frequency, and the first four-way valve 100 is controlled to switch to the second state.

[0068] refer to Fig. 9 , Fig. 9 The figure is a schematic diagram of the refrigerant flow when the heat pump unit is in the cooling mode, the water pipe 310 is installed upside down, and the first four-way valve 100 is in the second state. When the first four-way valve 100 is switched to the second state, the flow direction of the refrigerant in the heat exchange tube 320 changes. At this time, the flow direction of the refrigerant in the heat exchange tube 320 is from the first end of the heat exchange tube 320 to the second end of the heat exchange tube 320. Because the water inlet 311 is arranged correspondingly to the first end of the heat exchange tube 320 and the water outlet 312 is arranged correspondingly to the second end of the heat exchange tube 320, and because the flow direction of the water in the water pipe 310 is from the water outlet 312 to the water inlet 311, the flow direction of the refrigerant in the heat exchange tube 320 is opposite to the flow direction of the water in the water pipe 310, so that the countercurrent heat exchange of the heat pump unit can be realized.

[0069] refer to Figure 8 and Fig. 9If the first four-way valve 100 does not meet the second condition, the first four-way valve 100 is maintained in the second state. It can be understood that when the first four-way valve 100 does not meet the second condition, it means that the first four-way valve 100 is currently in the second state, that is, the flow direction of the refrigerant in the heat exchange tube 320 is from the first end of the heat exchange tube 320 to the second end of the heat exchange tube 320, and because the flow direction of the water in the water pipe 310 is from the water outlet 312 to the water inlet 311 at this time, the flow direction of the refrigerant in the heat exchange tube 320 is opposite to the flow direction of the water in the water pipe 310 at this time, and the heat pump unit is already in a countercurrent heat exchange state, and the first four-way valve 100 can maintain the current second state and continue to operate.

[0070] refer to Figure 8 and Fig.10 If the first real-time temperature and the second real-time temperature meet the first condition, determine whether the first four-way valve 100 meets the second condition; if the first four-way valve 100 does not meet the second condition, control the compressor 400 to reduce the operating frequency, and control the first four-way valve 100 to switch to the first state.

[0071] It is understandable that when the heat pump unit is in cooling mode, the temperature of the water in the water pipe 310 gradually decreases along the flow direction of the water, that is, when the heat pump unit is in cooling mode and the water pipe 310 is correctly installed, the flow direction of the water in the water pipe 310 is from the water inlet 311 to the water outlet 312, and T1 should be greater than T2. ​​If T1 and T2 meet the first condition, that is, T1>T2, it means that the first real-time temperature of the water at the water inlet 311 is greater than the second real-time temperature of the water at the water outlet 312, which means that the flow direction of the water in the current water pipe 310 is from the water inlet 311 to the water outlet 312, which means that the current water pipe 310 is correctly installed (not reversed). If and meet the first condition, it is determined whether the first four-way valve 100 meets the second condition, where the second condition is that the first four-way valve 100 is in the first state.

[0072] If the first four-way valve 100 does not meet the second condition, it means that the first four-way valve 100 is currently in the second state. When the first four-way valve 100 is in the second state, the flow direction of the refrigerant in the heat exchange tube 320 is from the first end of the heat exchange tube 320 to the second end of the heat exchange tube 320, because the water inlet 311 is corresponding to the first end of the heat exchange tube 320 and the water outlet 312 is corresponding to the second end of the heat exchange tube 320, and because the flow direction of the water in the water pipe 310 at this time is from the water inlet 311 to the water outlet 312, the flow direction of the refrigerant in the heat exchange tube 320 at this time is the same as the flow direction of the water in the water pipe 310, that is, the heat pump unit is in a downstream heat exchange state at this time. If the first four-way valve 100 does not meet the second condition, the compressor 400 is controlled to reduce the operating frequency, and the first four-way valve 100 is controlled to switch to the first state.

[0073] refer to Fig.10 , Fig.10 The figure is a schematic diagram of the refrigerant flow when the heat pump unit is in cooling mode, the water pipe 310 is correctly installed, and the first four-way valve 100 is in the first state. When the first four-way valve 100 is switched to the first state, the flow direction of the refrigerant in the heat exchange tube 320 changes. At this time, the flow direction of the refrigerant in the heat exchange tube 320 is from the second end of the heat exchange tube 320 to the first end of the heat exchange tube 320. Because the flow direction of the water in the water pipe 310 is from the water inlet 311 to the water outlet 312, the flow direction of the refrigerant in the heat exchange tube 320 is opposite to the flow direction of the water in the water pipe 310, so that the countercurrent heat exchange of the heat pump unit can be realized.

[0074] refer to Figure 8 and Fig.10 , if the first four-way valve 100 meets the second condition, the first four-way valve 100 is maintained in the first state. It can be understood that when the first four-way valve 100 meets the second condition, it means that the first four-way valve 100 is currently in the first state, that is, the flow direction of the refrigerant in the heat exchange tube 320 is from the second end of the heat exchange tube 320 to the first end of the heat exchange tube 320, and because the flow direction of the water in the water pipe 310 is from the water inlet 311 to the water outlet 312 at this time, the flow direction of the refrigerant in the heat exchange tube 320 is opposite to the flow direction of the water in the water pipe 310 at this time, and the heat pump unit is already in a countercurrent heat exchange state, and the first four-way valve 100 can maintain the current first state and continue to operate.

[0075] refer to Figure 8 and Fig.11 In one embodiment, if the current operating mode of the heat pump unit is the heating mode, the first real-time temperature and the second real-time temperature are obtained, and it is determined whether the first real-time temperature and the second real-time temperature meet the third condition, wherein the third condition is that the first real-time temperature is less than the second real-time temperature; if the first real-time temperature and the second real-time temperature do not meet the third condition, it is determined whether the first four-way valve 100 meets the fourth condition, wherein the fourth condition is that the first four-way valve 100 is in the second state; if the first four-way valve 100 meets the fourth condition, the compressor 400 is controlled to reduce the operating frequency, and the first four-way valve 100 is controlled to switch to the first state.

[0076] When the current operation mode of the heat pump unit is obtained as the heating mode, T1 and T2 are obtained, and it is determined whether the third condition is satisfied, wherein the third condition is that T1 is less than T2. ​​It is understandable that when the heat pump unit is in the heating mode, the refrigerant in the heat exchange tube 320 will release heat and transfer heat to the water in the water pipe 310, so that the temperature of the water in the water pipe 310 gradually increases along the flow direction of the water, that is, when the heat pump unit is in the heating mode and the water pipe 310 is installed correctly (not reversed), the flow direction of the water in the water pipe 310 is from the water inlet 311 to the water outlet 312, and T1 should be less than T2.

[0077] If and do not meet the third condition, that is, T1 ≥ T2, it means that the first real-time temperature of the water at the water inlet 311 is greater than or equal to the second real-time temperature of the water at the water outlet 312, which means that the current flow direction of the water in the water pipe 310 is from the water outlet 312 to the water inlet 311, which means that the current water pipe 310 is installed incorrectly (reversely). If T1 and T2 do not meet the third condition, it is determined whether the first four-way valve 100 meets the fourth condition, where the fourth condition is that the first four-way valve 100 is in the second state.

[0078] If the first four-way valve 100 meets the fourth condition, the first four-way valve 100 is currently in the second state. When the first four-way valve 100 is in the second state, the flow direction of the refrigerant in the heat exchange tube 320 is from the second end of the heat exchange tube 320 to the first end of the heat exchange tube 320, because the water inlet 311 is corresponding to the first end of the heat exchange tube 320 and the water outlet 312 is corresponding to the second end of the heat exchange tube 320, and because the flow direction of the water in the water pipe 310 at this time is from the water outlet 312 to the water inlet 311, the flow direction of the refrigerant in the heat exchange tube 320 is the same as the flow direction of the water in the water pipe 310, that is, the heat pump unit is in a downstream heat exchange state. If the first four-way valve 100 meets the fourth condition, the compressor 400 is controlled to reduce the operating frequency, and the first four-way valve 100 is controlled to switch to the first state.

[0079] refer to Fig.11 , Fig.11The figure is a schematic diagram of the refrigerant flow when the heat pump unit is in the heating mode, the water pipe 310 is installed upside down, and the first four-way valve 100 is in the first state. When the first four-way valve 100 is switched to the first state, the flow direction of the refrigerant in the heat exchange tube 320 changes. At this time, the flow direction of the refrigerant in the heat exchange tube 320 is from the first end of the heat exchange tube 320 to the second end of the heat exchange tube 320. Because the water inlet 311 is arranged correspondingly to the first end of the heat exchange tube 320 and the water outlet 312 is arranged correspondingly to the second end of the heat exchange tube 320, and because the flow direction of the water in the water pipe 310 is from the water outlet 312 to the water inlet 311, the flow direction of the refrigerant in the heat exchange tube 320 is opposite to the flow direction of the water in the water pipe 310, so that the countercurrent heat exchange of the heat pump unit can be realized.

[0080] refer to Fig.11 If the first four-way valve 100 does not meet the fourth condition, the first four-way valve 100 is maintained in the first state. It can be understood that when the first four-way valve 100 does not meet the fourth condition, it means that the current first four-way valve 100 is in the first state, that is, the flow direction of the refrigerant in the heat exchange tube 320 is from the first end of the heat exchange tube 320 to the second end of the heat exchange tube 320, and because the flow direction of the water in the water pipe 310 is from the water outlet 312 to the water inlet 311 at this time, the flow direction of the refrigerant in the heat exchange tube 320 is opposite to the flow direction of the water in the water pipe 310 at this time, and the heat pump unit is already in a countercurrent heat exchange state, and the first four-way valve 100 can maintain the current first state and continue to operate.

[0081] refer to Figure 8 and Fig.12 If the first real-time temperature and the second real-time temperature satisfy the third condition, determine whether the first four-way valve 100 satisfies the fourth condition; if the first four-way valve 100 does not satisfy the fourth condition, control the compressor 400 to reduce the operating frequency, and control the first four-way valve 100 to switch to the second state.

[0082] It is understandable that when the heat pump unit is in the heating mode, the temperature of the water in the water pipe 310 gradually increases along the flow direction of the water, that is, when the heat pump unit is in the heating mode and the water pipe 310 is installed correctly, the flow direction of the water in the water pipe 310 is from the water inlet 311 to the water outlet 312, and T1 should be less than T2. ​​If and meet the third condition, that is, T1<T2, it means that the first real-time temperature of the water at the water inlet 311 is less than the second real-time temperature of the water at the water outlet 312, that is, it means that the flow direction of the water in the current water pipe 310 is from the water inlet 311 to the water outlet 312, that is, it means that the current water pipe 310 is installed correctly (not reversed). If T1 and T2 meet the third condition, it is determined whether the first four-way valve 100 meets the fourth condition, where the second condition is that the first four-way valve 100 is in the second state.

[0083] If the first four-way valve 100 does not meet the fourth condition, it means that the first four-way valve 100 is currently in the first state. When the first four-way valve 100 is in the first state, the flow direction of the refrigerant in the heat exchange tube 320 is from the first end of the heat exchange tube 320 to the second end of the heat exchange tube 320, because the water inlet 311 is corresponding to the first end of the heat exchange tube 320 and the water outlet 312 is corresponding to the second end of the heat exchange tube 320, and because the flow direction of the water in the water pipe 310 at this time is from the water inlet 311 to the water outlet 312, the flow direction of the refrigerant in the heat exchange tube 320 at this time is the same as the flow direction of the water in the water pipe 310, that is, the heat pump unit is in a downstream heat exchange state at this time. If the first four-way valve 100 does not meet the second condition, the compressor 400 is controlled to reduce the operating frequency, and the first four-way valve 100 is controlled to switch to the second state.

[0084] refer to Fig.12 , Fig.12 The figure is a schematic diagram of the refrigerant flow when the heat pump unit is in the heating mode, the water pipe 310 is correctly installed, and the first four-way valve 100 is in the second state. When the first four-way valve 100 is switched to the second state, the flow direction of the refrigerant in the heat exchange tube 320 changes. At this time, the flow direction of the refrigerant in the heat exchange tube 320 is from the second end of the heat exchange tube 320 to the first end of the heat exchange tube 320. Because the flow direction of the water in the water pipe 310 is from the water inlet 311 to the water outlet 312, the flow direction of the refrigerant in the heat exchange tube 320 is opposite to the flow direction of the water in the water pipe 310, so that the countercurrent heat exchange of the heat pump unit can be realized.

[0085] refer to Fig.12 , if the first four-way valve 100 satisfies the fourth condition, the first four-way valve 100 is maintained in the second state. It can be understood that when the first four-way valve 100 satisfies the fourth condition, it means that the first four-way valve 100 is currently in the second state, that is, the flow direction of the refrigerant in the heat exchange tube 320 is from the second end of the heat exchange tube 320 to the first end of the heat exchange tube 320, and because the flow direction of the water in the water pipe 310 is from the water inlet 311 to the water outlet 312 at this time, the flow direction of the refrigerant in the heat exchange tube 320 is opposite to the flow direction of the water in the water pipe 310 at this time, and the heat pump unit is already in a countercurrent heat exchange state, and the first four-way valve 100 can maintain the current second state and continue to operate.

[0086] In the embodiment of the present invention, when switching the state of the first four-way valve 100, the operating frequency of the compressor 400 needs to be reduced to reduce the pressure of the refrigerant in the circuit and ensure that the first four-way valve 100 can switch states smoothly.

[0087] refer to Figure 8In one embodiment, the working time threshold is 8 minutes. When the user controls the heat pump unit to start, the timing module starts timing. When the running time of the heat pump unit is equal to the working time threshold, the current operating mode of the heat pump unit is obtained;

[0088] When the heat pump unit is running in cooling mode, obtain the first real-time temperature T1 of the water at the water inlet 311 of the water pipe 310, obtain the first real-time temperature T2 of the water at the water inlet 311 of the water pipe 310, and determine whether T1 is greater than T2;

[0089] When T1>T2, determine whether the first four-way valve 100 is in the first state; when the first four-way valve 100 is in the first state, the first four-way valve 100 maintains the first state, and the heat pump unit operates normally; when the first four-way valve 100 is in the second state, reduce the operating frequency of the compressor 400, and control the first four-way valve 100 to switch to the first state.

[0090] When T1≤T2, determine whether the first four-way valve 100 is in the first state; when the first four-way valve 100 is in the first state, reduce the operating frequency of the compressor 400, and switch the first four-way valve 100 to the second state; when the first four-way valve 100 is in the second state, the first four-way valve 100 maintains the second state, and the heat pump unit operates normally.

[0091] When the heat pump unit is running in the heating mode, the first real-time temperature T1 of the water at the water inlet 311 of the water pipe 310 is obtained, and the first real-time temperature T2 of the water at the water inlet 311 of the water pipe 310 is obtained to determine whether it is less than;

[0092] When T1<T2, determine whether the first four-way valve 100 is in the second state; when the first four-way valve 100 is in the second state, the first four-way valve 100 maintains the second state, and the heat pump unit operates normally; when the first four-way valve 100 is in the first state, reduce the operating frequency of the compressor 400, and control the first four-way valve 100 to switch to the second state.

[0093] When T1≥T2, determine whether the first four-way valve 100 is in the second state; when the first four-way valve 100 is in the second state, reduce the operating frequency of the compressor 400, and switch the first four-way valve 100 to the first state; when the first four-way valve 100 is in the first state, the first four-way valve 100 maintains the first state, and the heat pump unit operates normally.

[0094] The heat pump unit control method of one embodiment of the present invention can detect whether the water pipe 310 is installed upside down, and regardless of whether it is in cooling mode or heating mode, and regardless of whether the water pipe 310 is installed upside down, the heat pump unit can always be in a countercurrent heat exchange state, which is beneficial to ensure the heat exchange effect of the heat pump unit.

[0095] The present invention also provides a heat pump unit, which includes a control device, which includes a processor and a memory, the processor and the memory are connected, the memory is used to store programs, the processor is used to call and execute the programs stored in the memory, and the program is used to execute the above-mentioned heat pump unit control method.

[0096] The processor can be implemented in the form of a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits, etc., and is used to execute relevant programs to implement the technical solution provided in the embodiment of the present application; the memory can be implemented in the form of a read-only memory (ROM), a static storage device, a dynamic storage device, or a random access memory (RAM). The memory can store an operating system and other application programs. When the technical solution provided in the embodiment of this specification is implemented by software or firmware, the relevant program code is stored in the memory, and the processor is called to execute the defrosting method of the embodiment of the present application.

[0097] The control device also includes an input / output interface, a communication interface and a bus. The input / output interface is used to realize information input and output; the communication interface is used to realize communication interaction between the device and other devices, and communication can be realized through wired methods (such as USB, network cables, etc.) or wireless methods (such as mobile networks, WIFI, Bluetooth, etc.); the bus is used to transmit information between various components of the device (such as processors, memories, input / output interfaces and communication interfaces). The processor, memory, input / output interface and communication interface realize communication connection with each other inside the device through the bus.

[0098] In the second embodiment of the present invention, the heat pump unit further includes an expansion valve 600, which is arranged on the loop and between the heat exchange pipe 320 and the outdoor heat exchanger 500. The expansion valve 600 is a common valve component in the heat pump system and will not be further described here.

[0099] The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the above-mentioned implementation mode. Technical personnel familiar with the field can also make various equivalent deformations or substitutions under the shared conditions without violating the spirit of the present invention. These equivalent deformations or substitutions are all included in the scope defined by the claims of the present invention.

[0100] Of course, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the present invention, and these equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A heat pump unit control method, characterized in that: Applicable to a heat pump unit, the heat pump unit comprises a compressor (400), an outdoor heat exchanger (500), a water-fluorine heat exchanger (300), a first four-way valve (100) and a second four-way valve (200); the water-fluorine heat exchanger (300) comprises a water pipe (310) and a heat exchange pipe (320); the water pipe (310) has a water inlet (311) and a water outlet (312); the first four-way valve (100) has a first state and a second state; The heat pump unit control method comprises: Preset working time thresholds; After the heat pump unit is started and runs at the working time threshold, obtaining whether the current operating mode of the heat pump unit is the cooling mode or the heating mode, obtaining the first real-time temperature of the water at the water inlet (311) and the second real-time temperature of the water at the water outlet (312), and obtaining the current state of the first four-way valve (100); According to the current operating mode of the heat pump unit, according to the comparison result of the first real-time temperature and the second real-time temperature, and according to the current state of the first four-way valve (100), the first four-way valve (100) is controlled to switch to the first state or the second state, so that the flow direction of the refrigerant in the heat exchange tube (320) can be opposite to the flow direction of the water in the water pipe (310).

2. The heat pump unit control method according to claim 1, characterized in that: If the current operation mode of the heat pump unit is the cooling mode, obtaining the first real-time temperature and the second real-time temperature, and determining whether the first real-time temperature and the second real-time temperature meet a first condition, wherein the first condition is that the first real-time temperature is greater than the second real-time temperature; If the first real-time temperature and the second real-time temperature do not satisfy the first condition, determining whether the first four-way valve (100) satisfies a second condition, wherein the second condition is that the first four-way valve (100) is in the first state; If the first four-way valve (100) satisfies the second condition, the compressor (400) is controlled to reduce the operating frequency, and the first four-way valve (100) is controlled to switch to the second state.

3. The heat pump unit control method according to claim 2, characterized in that: If the first four-way valve (100) does not satisfy the second condition, the first four-way valve (100) is maintained in the second state.

4. The heat pump unit control method according to claim 2, characterized in that: If the first real-time temperature and the second real-time temperature satisfy the first condition, it is determined whether the first four-way valve (100) satisfies the second condition; if the first four-way valve (100) does not satisfy the second condition, the compressor (400) is controlled to reduce the operating frequency, and the first four-way valve (100) is controlled to switch to the first state.

5. The heat pump unit control method according to claim 4, characterized in that: If the first four-way valve (100) satisfies the second condition, the first four-way valve (100) is maintained in the first state.

6. The heat pump unit control method according to claim 1, characterized in that: If the current operation mode of the heat pump unit is the heating mode, obtaining the first real-time temperature and the second real-time temperature, and determining whether the first real-time temperature and the second real-time temperature meet a third condition, wherein the third condition is that the first real-time temperature is less than the second real-time temperature; If the first real-time temperature and the second real-time temperature do not satisfy the third condition, determining whether the first four-way valve (100) satisfies a fourth condition, wherein the fourth condition is that the first four-way valve (100) is in the second state; If the first four-way valve (100) satisfies the fourth condition, the compressor (400) is controlled to reduce the operating frequency, and the first four-way valve (100) is controlled to switch to the first state.

7. The heat pump unit control method according to claim 6, characterized in that: If the first four-way valve (100) does not satisfy the fourth condition, the first four-way valve (100) is maintained in the first state.

8. The heat pump unit control method according to claim 6, characterized in that: If the first real-time temperature and the second real-time temperature satisfy the third condition, it is determined whether the first four-way valve (100) satisfies the fourth condition; if the first four-way valve (100) does not satisfy the fourth condition, the compressor (400) is controlled to reduce the operating frequency, and the first four-way valve (100) is controlled to switch to the second state.

9. The heat pump unit control method according to claim 8, characterized in that: If the first four-way valve (100) satisfies the fourth condition, the first four-way valve (100) is maintained in the second state.

10. A heat pump unit, characterized in that: include: A control device, the control device comprising a processor and a memory, the processor and the memory are connected, the memory is used to store the program, the processor is used to call and execute the program stored in the memory, and the program is used to execute the heat pump unit control method according to any one of claims 1 to 9.

Images