Heat pump unit, heat pump unit control method, equipment and storage medium

Abstract

The embodiment of the invention discloses a heat pump unit, a control method, equipment and a storage medium. The condenser output end of the heat pump unit is connected with the first input end of the first combination valve; the first output end of the first combination valve is connected with the first input end of the economizer and the first end of the first electromagnetic valve; a first output end of the economizer is connected with a second input end of the compressor; a second output end of the economizer is connected with a first end of the enthalpy-increasing electronic expansion valve; the second end of the enthalpy-increasing electronic expansion valve is connected with the second end of the first electromagnetic valve and the first end of the second electromagnetic valve; the second end of the second electromagnetic valve is connected with the second input end of the economizer and the first end of the main electronic expansion device; the second end of the main electronic expansion valve is connected with the second input end of the first combination valve; the second output end of the first combination valve is connected with the input end of the fin heat exchanger; the controller is connected with the first electromagnetic valve and the second electromagnetic valve and used for controlling opening and closing of the first electromagnetic valve and the second electromagnetic valve according to the current supercooling degree, the problem of poor operation reliability is solved, and the operation reliability of the heat pump unit is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of heat pump control technology, and in particular, to a heat pump unit, a heat pump unit control method, a device, and a storage medium. Background Art

[0002] Air source heat pump unit is a kind of equipment that uses air as low temperature heat source, drives the compressor through a small amount of electric energy, and increases the low heat energy in the air to high heat energy to achieve heating. Heat pump unit is widely used in people's work and life based on its advantages such as high efficiency and environmental protection.

[0003] In existing heat pump systems, the enthalpy-increasing liquid extraction position is fixed. As the system operating conditions change, based on a fixed enthalpy-increasing liquid extraction position, the efficiency of the heat pump unit may decrease, and even problems such as compressor liquid hammer may occur. Summary of the invention

[0004] The embodiments of the present application provide a heat pump unit, a heat pump unit control method, a device and a storage medium, which can solve the technical problem of poor operating reliability of the heat pump unit and improve the operating reliability of the heat pump unit.

[0005] In a first aspect, an embodiment of the present application provides a heat pump unit, including: a fin heat exchanger, a compressor, a four-way valve, a condenser, a first combination valve, a filter, an economizer, a main circuit electronic expansion valve, an enthalpy-increasing electronic expansion valve, a first solenoid valve, a second solenoid valve, and a controller;

[0006] The output end of the fin heat exchanger is connected to the input end of the condenser, the first input end of the compressor and the first output end of the compressor through a four-way valve;

[0007] The output end of the condenser is connected to the first input end of the first combination valve;

[0008] A first output end of the first combination valve is connected to a first input end of the economizer and a first end of the first solenoid valve;

[0009] The first output end of the economizer is connected to the second input end of the compressor, and the second output end of the economizer is connected to the first end of the enthalpy-increasing electronic expansion valve;

[0010] The second end of the enthalpy-increasing electronic expansion valve is connected to the second end of the first solenoid valve and the first end of the second solenoid valve;

[0011] The second end of the second solenoid valve is connected to the second input end of the economizer and the first end of the main circuit electronic expansion;

[0012] The second end of the main electronic expansion valve is connected to the second input end of the first combination valve;

[0013] The second output end of the first combination valve is connected to the input end of the fin heat exchanger;

[0014] The controller is connected to the first solenoid valve and the second solenoid valve. The controller is used to control the first solenoid valve to open and the second solenoid valve to close when the current supercooling degree is greater than or equal to a preset threshold; and to control the first solenoid valve to close and the second solenoid valve to open when the current supercooling degree is less than the preset threshold.

[0015] In one embodiment, the heat pump unit further includes a temperature sensor and a pressure sensor;

[0016] The temperature sensor and the pressure sensor are arranged on the pipeline at the output end of the condenser.

[0017] In one embodiment, the heat pump unit further comprises a first three-way valve;

[0018] The first end of the first three-way valve is connected to the first output end of the first combination valve;

[0019] The second end of the first three-way valve is connected to the first end of the first solenoid valve;

[0020] The third end of the first three-way valve is connected to the first input end of the economizer.

[0021] In one embodiment, the first combination valve includes a second three-way valve, a third three-way valve, a fourth three-way valve, a fifth three-way valve, a first check valve, a second check valve, a third check valve and a fourth check valve;

[0022] A first end of the second three-way valve is connected to the output end of the condenser, a second end of the second three-way valve is connected to the output end of the first one-way valve, and a third end of the second three-way valve is connected to the input end of the second one-way valve;

[0023] The output end of the second one-way valve is connected to the first end of the third three-way valve;

[0024] The second end of the third three-way valve is connected to the output end of the third one-way valve, and the third end of the third three-way valve is connected to the first end of the first three-way valve;

[0025] The first end of the fourth three-way valve is connected to the second end of the main electronic expansion valve, the second end of the fourth three-way valve is connected to the input end of the first one-way valve, and the third end of the fourth three-way valve is connected to the input end of the fourth one-way valve;

[0026] The output end of the fourth one-way valve is connected to the first end of the fifth three-way valve, the second end of the fifth three-way valve is connected to the input end of the third one-way valve, and the third end of the fifth three-way valve is connected to the input end of the fin heat exchanger.

[0027] In one embodiment, the heat pump unit further comprises a sixth three-way valve;

[0028] The first end of the sixth three-way valve is connected to the second end of the first solenoid valve;

[0029] The second end of the sixth three-way valve is connected to the second end of the enthalpy-increasing electronic expansion valve;

[0030] The third end of the sixth three-way valve is connected to the second end of the second solenoid valve.

[0031] In one embodiment, the heat pump unit further includes a seventh three-way valve;

[0032] The first end of the seventh three-way valve is connected to the second end of the second solenoid valve;

[0033] The second end of the seventh three-way valve is connected to the second input end of the economizer;

[0034] The third end of the seventh three-way valve is connected to the first end of the main electronic expansion valve.

[0035] In a second aspect, an embodiment of the present application provides a heat pump unit control method, which is used for the heat pump unit described in the first aspect. The heat pump unit control method includes:

[0036] Acquire a first temperature value through a temperature sensor on a pipe at an output end of the condenser, and acquire a first pressure value through a pressure sensor on a pipe at an output end of the condenser;

[0037] determining a current degree of subcooling according to the first temperature value and the first pressure value;

[0038] When the current degree of supercooling is greater than or equal to a preset threshold, the first solenoid valve is controlled to open, and the second solenoid valve is controlled to close;

[0039] When the current supercooling degree is less than a preset threshold, the first solenoid valve is controlled to be closed, and the second solenoid valve is controlled to be opened.

[0040] In one embodiment, determining the current degree of subcooling according to the first temperature value and the first pressure value includes:

[0041] Determining a saturated condensation temperature value according to the first pressure value and a preset mapping relationship;

[0042] The current degree of subcooling is determined according to the difference between the first temperature value and the saturated condensing temperature value.

[0043] In a third aspect, an embodiment of the present application provides a heat pump unit control device, including:

[0044] memory and one or more processors;

[0045] A memory for storing one or more programs;

[0046] When one or more programs are executed by one or more processors, the one or more processors implement the heat pump unit control method as in the second aspect.

[0047] In a fourth aspect, an embodiment of the present application provides a storage medium storing computer executable instructions, which, when executed by a computer processor, are used to execute the heat pump unit control method of the second aspect.

[0048] The embodiment of the present application sets a first solenoid valve and a second solenoid valve in the heat pump unit so that when the first solenoid valve is opened and the second solenoid valve is closed, enthalpy-added upstream liquid extraction is realized, that is, the enthalpy-added circulating refrigerant passes through the condenser and before entering the economizer, and then passes through the enthalpy-added electronic expansion valve for throttling. When the current supercooling degree is greater than or equal to the preset threshold, the enthalpy-added upstream liquid extraction method can ensure that the fin heat exchanger can fully evaporate, thereby avoiding liquid hammer caused by incompletely evaporated liquid refrigerant entering the compressor, thereby improving the operating reliability of the heat pump unit; when the first solenoid valve is closed and the second solenoid valve is opened, enthalpy-added downstream liquid extraction is realized, that is, the enthalpy-added circulating refrigerant passes through the condenser and enters the economizer, and then passes through the enthalpy-added electronic expansion valve for throttling. Liquid taking method, when the current supercooling degree is less than the preset threshold value, the main circuit refrigerant can be secondary supercooled by taking liquid through the enthalpy-added downstream method using the economizer, so as to avoid partial evaporation of the refrigerant before entering the valve or fin heat exchanger, avoid affecting the accuracy of the valve and the evaporation capacity of the fin heat exchanger, thereby improving the operating reliability of the heat pump unit; compared with the existing heat pump unit with a fixed enthalpy-added liquid taking position, this embodiment is based on adding a corresponding first solenoid valve and a second solenoid valve to the heat pump unit to achieve different enthalpy-added liquid taking position points when the current supercooling degree is different, so as to change the enthalpy-added liquid taking position point according to the actual operating conditions to avoid problems such as compressor liquid hammer, thereby improving the operating reliability of the heat pump unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 is a structural schematic diagram of a heat pump unit provided in an embodiment of the present application;

[0050] Figure 2 is a flow chart of a heat pump unit control method provided in an embodiment of the present application;

[0051] Figure 3 It is a structural schematic diagram of a heat pump unit control device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical scheme and advantages of the present application clearer, the specific embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. It is understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for the convenience of description, only the part related to the present application but not all the contents are shown in the accompanying drawings. Before discussing the exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flow charts. Although the flow chart describes each operation (or step) as a sequential process, many of the operations therein can be implemented in parallel, concurrently or simultaneously. In addition, the order of each operation can be rearranged. The process can be terminated when its operation is completed, but it can also have additional steps not included in the accompanying drawings. The process can correspond to a method, a function, a procedure, a subroutine, a subprogram, etc.

[0053] In existing heat pump systems, the enthalpy-increasing liquid extraction position is fixed. As the system operating conditions change, based on a fixed enthalpy-increasing liquid extraction position, the efficiency of the heat pump unit may decrease, and even problems such as compressor liquid hammer may occur;

[0054] Based on this, a heat pump unit, a heat pump unit control method, an apparatus and a storage medium of the embodiments of the present application are provided, aiming at realizing enthalpy-added upstream liquid extraction when the current supercooling degree is greater than or equal to a preset threshold value when the first solenoid valve is opened and the second solenoid valve is closed during the control of the heat pump unit, that is, the enthalpy-added circulating refrigerant passes through the condenser before entering the economizer, and the throttling liquid extraction method of the enthalpy-added electronic expansion valve can ensure that the fin heat exchanger can be fully evaporated, thereby avoiding liquid hammer caused by incompletely evaporated liquid refrigerant entering the compressor, thereby improving the operating reliability of the heat pump unit; when the current supercooling degree is less than the preset threshold value, the first solenoid valve is closed and the second solenoid valve is opened, to realize enthalpy-added downstream liquid extraction, that is, the enthalpy-added circulating refrigerant passes through the condenser before entering the economizer. The economizer and the liquid taking method after entering the economizer, and then passing through the throttling of the enthalpy increased electronic expansion valve, can use the economizer to perform secondary supercooling on the main refrigerant, so as to avoid partial evaporation of the refrigerant before entering the valve part or the fin heat exchanger, avoid affecting the accuracy of the valve part and the evaporation capacity of the fin heat exchanger, thereby improving the operating reliability of the heat pump unit; compared with the existing heat pump unit with a fixed enthalpy increased liquid taking position, this embodiment is based on adding a corresponding first solenoid valve and a second solenoid valve in the heat pump unit to achieve different enthalpy increased liquid taking position points when the current supercooling degree is different, so as to change the enthalpy increased liquid taking position point according to the actual operating conditions, so as to avoid problems such as compressor liquid hammer, thereby improving the operating reliability of the heat pump unit.

[0055] Figure 1 is a schematic diagram of the structure of a heat pump unit provided in an embodiment of the present application, referring to Figure 1The heat pump unit includes: a fin heat exchanger 11, a compressor 12, a four-way valve 13, a condenser 14, a first combination valve 15, an economizer 16, a main electronic expansion valve 17, an enthalpy-increasing electronic expansion valve 18, a first solenoid valve 19, a second solenoid valve 20 and a controller (not shown in the figure). The output end of the fin heat exchanger 11 is connected to the input end of the condenser 14, the first input end of the compressor 12 and the first output end of the compressor 12 through the four-way valve 13. The output end of the condenser 14 is connected to the first input end of the first combination valve 15. The first output end of the first combination valve 15 is connected to the first input end of the economizer 16 and the first end of the first solenoid valve 19. The first output end of the economizer 16 is connected to the second input end of the compressor 12, and the second output end of the economizer 16 is connected to the first end of the enthalpy-increasing electronic expansion valve 18. The second end of the enthalpy-increasing electronic expansion valve 18 is connected to the second end of the first solenoid valve 19 and the first end of the second solenoid valve 20. The second end of the second solenoid valve 20 is connected to the second input end of the economizer 16 and the first end of the main electronic expansion valve 17. The second end of the main electronic expansion valve 17 is connected to the second input end of the first combination valve 15. The second output end of the first combination valve 15 is connected to the input end of the fin heat exchanger 11. The controller is connected to the first solenoid valve 19 and the second solenoid valve 20, and the controller is used to control the first solenoid valve 19 to open and the second solenoid valve 20 to close when the current supercooling degree is greater than or equal to a preset threshold; and control the first solenoid valve 19 to close and the second solenoid valve 20 to open when the current supercooling degree is less than the preset threshold.

[0056] In one embodiment, the heat pump unit further includes a temperature sensor 21 and a pressure sensor 22. The temperature sensor 21 and the pressure sensor 22 are arranged on the pipe at the output end of the condenser 14. The first temperature value of the output end of the condenser 14 can be detected by the temperature sensor 21, and the first pressure value of the output end of the condenser 14 can be detected by the pressure sensor 22. The saturated condensing temperature value corresponding to the current pressure value can be determined according to the first pressure value, so that the current supercooling degree can be obtained according to the difference between the first temperature value and the saturated condensing temperature value. Subsequently, the opening and closing control of the first solenoid valve 19 and the second solenoid valve 20 can be performed according to the current supercooling degree to realize the enthalpy-increasing upstream liquid extraction or the enthalpy-increasing downstream liquid extraction. Compared with the existing heat pump unit with a fixed enthalpy-increasing liquid extraction position, this embodiment realizes that when the current supercooling degree is different, different enthalpy-increasing liquid extraction position points are selected, so as to change the enthalpy-increasing liquid extraction position point according to the actual operation situation, so as to avoid the occurrence of problems such as liquid hammer of the compressor 12, thereby improving the operation reliability of the heat pump unit.

[0057] In one embodiment, the heat pump unit further includes a first three-way valve 23. A first end of the first three-way valve 23 is connected to a first output end of the first combination valve 15, a second end of the first three-way valve 23 is connected to a first end of the first solenoid valve 19, and a third end of the first three-way valve 23 is connected to a first input end of the economizer 16.

[0058] In one embodiment, the first combination valve 15 includes a second three-way valve 151, a third three-way valve 152, a fourth three-way valve 153, a fifth three-way valve 154, a first check valve 155, a second check valve 156, a third check valve 157 and a fourth check valve 158. The first end of the second three-way valve 151 is connected to the output end of the condenser 14, the second end of the second three-way valve 151 is connected to the output end of the first check valve 155, and the third end of the second three-way valve 151 is connected to the input end of the second check valve 156. The output end of the second check valve 156 is connected to the first end of the third three-way valve 152. The second end of the third three-way valve 152 is connected to the output end of the third check valve 157, and the third end of the third three-way valve 152 is connected to the first end of the first three-way valve 23. The first end of the fourth three-way valve 153 is connected to the second end of the main electronic expansion valve 17, the second end of the fourth three-way valve 153 is connected to the input end of the first one-way valve 155, and the third end of the fourth three-way valve 153 is connected to the input end of the fourth one-way valve 158. The output end of the fourth one-way valve 158 is connected to the first end of the fifth three-way valve 154, the second end of the fifth three-way valve 154 is connected to the input end of the third one-way valve 157, and the third end of the fifth three-way valve 154 is connected to the input end of the fin heat exchanger 11. The orderly diversion of the main refrigerant is achieved through the first combination valve 15, thereby improving the circulation orderliness of the main refrigerant.

[0059] In one embodiment, the heat pump unit further includes a sixth three-way valve 24. A first end of the sixth three-way valve 24 is connected to a second end of the first solenoid valve 19, a second end of the sixth three-way valve 24 is connected to a second end of the enthalpy-increasing electronic expansion valve 18, and a third end of the sixth three-way valve 24 is connected to a second end of the second solenoid valve 20.

[0060] In one embodiment, the heat pump unit further includes a seventh three-way valve 25. A first end of the seventh three-way valve 25 is connected to a second end of the second solenoid valve 20, a second end of the seventh three-way valve 25 is connected to a second input end of the economizer 16, and a third end of the seventh three-way valve 25 is connected to a first end of the main electronic expansion valve 17.

[0061] In the above, by setting the first solenoid valve and the second solenoid valve in the heat pump unit, when the first solenoid valve is opened and the second solenoid valve is closed, the enthalpy-added upstream liquid extraction is realized, that is, the enthalpy-added circulating refrigerant passes through the condenser and before entering the economizer, and then passes through the enthalpy-added electronic expansion valve for throttling liquid extraction. When the current supercooling degree is greater than or equal to the preset threshold, the enthalpy-added upstream liquid extraction method can ensure that the fin heat exchanger can fully evaporate, thereby avoiding liquid hammer caused by incompletely evaporated liquid refrigerant entering the compressor, thereby improving the operating reliability of the heat pump unit; when the first solenoid valve is closed and the second solenoid valve is opened, the enthalpy-added downstream liquid extraction is realized, that is, the enthalpy-added circulating refrigerant passes through the condenser and enters the economizer, and then passes through the enthalpy-added electronic expansion valve for throttling liquid extraction. In this way, when the current supercooling degree is less than the preset threshold value, the main circuit refrigerant can be secondary supercooled by the economizer through the method of taking liquid downstream by enthalpy increase, so as to avoid partial evaporation of the refrigerant before entering the valve part or the fin heat exchanger, avoid affecting the accuracy of the valve part and the evaporation capacity of the fin heat exchanger, thereby improving the operating reliability of the heat pump unit; compared with the existing heat pump unit with a fixed enthalpy increase liquid taking position, this embodiment is based on adding a corresponding first solenoid valve and a second solenoid valve in the heat pump unit to achieve different enthalpy increase liquid taking position points when the current supercooling degree is different, so as to change the enthalpy increase liquid taking position point according to the actual operating conditions to avoid problems such as compressor liquid hammer, thereby improving the operating reliability of the heat pump unit.

[0062] Figure 2 A flow chart of a heat pump unit control method provided in an embodiment of the present application is given. The heat pump unit control method provided in this embodiment can be executed by a heat pump unit control device, which can be implemented by software and / or hardware. The heat pump unit control device can be composed of two or more physical entities, or can be composed of one physical entity. Generally speaking, the heat pump unit control device can be a controller of the heat pump unit.

[0063] The following description is made by taking the controller in the heat pump unit as the main body for executing the heat pump unit control method. Figure 2 The heat pump unit control method is used for the aforementioned heat pump unit, and the heat pump unit control method specifically includes:

[0064] S101 . Acquire a first temperature value through a temperature sensor on a pipe at an output end of a condenser, and acquire a first pressure value through a pressure sensor on a pipe at an output end of the condenser.

[0065] The temperature is detected by a temperature sensor installed on the pipe at the output end of the condenser to obtain a first temperature value; the pressure is detected by a pressure sensor installed on the pipe at the output end of the condenser to obtain a first pressure value. The first temperature value and the first pressure value at the output end of the condenser are detected by the temperature sensor and the pressure sensor, and transmitted to the controller of the heat pump unit. The controller receives the sensor data, that is, receives the first temperature value and the first pressure value, to calculate the corresponding current supercooling degree, and subsequently controls the opening and closing of the first solenoid valve and the second solenoid valve according to the current supercooling degree.

[0066] S102: Determine a current degree of supercooling according to a first temperature value and a first pressure value.

[0067] The current saturated condensing temperature value is determined according to the first pressure value detected by the pressure sensor and the preset mapping relationship. The current subcooling degree is determined according to the difference between the currently measured first temperature value and the current saturated condensing temperature value. For example, according to the formula: Tsubcooling = Tcondensing out - Tsaturated condensing, the current saturated condensing temperature value is calculated, wherein Tsaturated condensing is the saturated condensing temperature value of the refrigerant at the current pressure, Tcondensing out is the actual temperature of the condenser outlet, that is, the first temperature value, and Tsubcooling is the current saturated condensing temperature value.

[0068] S103: When the current degree of supercooling is greater than or equal to a preset threshold, control the first solenoid valve to open, and control the second solenoid valve to close.

[0069] The temperature sensor and the pressure sensor are used to detect the degree of subcooling at the output end of the condenser in real time. When the current degree of subcooling is greater than or equal to the preset threshold, for example, greater than or equal to 5°C, the first solenoid valve is controlled to open, and the second solenoid valve is controlled to close. The heat pump unit performs enthalpy-added upstream liquid extraction, that is, the enthalpy-added circulating refrigerant passes through the condenser before entering the economizer and passes through the enthalpy-added electronic expansion valve for throttling. When the current degree of subcooling is greater than or equal to the preset threshold, the enthalpy-added upstream liquid extraction method is adopted to ensure that the fin heat exchanger can fully evaporate, thereby avoiding liquid hammer caused by the incompletely evaporated liquid refrigerant entering the compressor, thereby improving the operating reliability of the heat pump unit; in addition, it can also avoid the evaporation energy efficiency of the fin heat exchanger being too low, thereby improving the overall working energy efficiency of the heat pump unit.

[0070] It should be noted that the preset threshold can be set according to actual conditions and is not limited in this embodiment.

[0071] S104: When the current supercooling degree is less than a preset threshold, the first solenoid valve is controlled to be closed, and the second solenoid valve is controlled to be opened.

[0072] The temperature sensor and the pressure sensor are used to detect the degree of subcooling at the output end of the condenser in real time. When the current degree of subcooling is less than the preset threshold, for example, less than 5°C, the first solenoid valve is controlled to be closed, and the second solenoid valve is controlled to be opened, and the heat pump unit performs enthalpy-added downstream liquid extraction, that is, the enthalpy-added circulating refrigerant passes through the condenser and enters the economizer, and then passes through the enthalpy-added electronic expansion valve to throttle the liquid extraction method. When the current degree of subcooling is less than the preset threshold, the enthalpy-added downstream liquid extraction method is adopted, and the main refrigerant can be subcooled twice by the economizer, thereby improving the working energy efficiency of the heat pump unit; and it can avoid the refrigerant from partially evaporating before entering the valve or fin heat exchanger, avoiding affecting the accuracy of the valve and the evaporation capacity of the fin heat exchanger, thereby improving the operating reliability of the heat pump unit and improving the overall working energy efficiency of the heat pump unit.

[0073] After switching the enthalpy increase liquid tapping point, that is, executing the above-mentioned step S103 or S104, continue to monitor the current supercooling through the temperature sensor and the pressure sensor, and dynamically adjust the enthalpy increase liquid tapping point according to the real-time monitored data, that is, dynamically control the opening and closing of the first solenoid valve and the second solenoid valve to ensure efficient operation of the heat pump unit.

[0074] As described above, by real-time detection and dynamic adjustment of the enthalpy increase liquid extraction point, the operating state of the heat pump unit is optimized, energy loss is reduced, and thus the working efficiency of the heat pump unit is improved; and, by dynamically adjusting the enthalpy increase liquid extraction point, problems such as liquid hammer, insufficient supercooling or excessive supercooling caused by the existing fixed liquid extraction method are avoided, thereby improving the operating stability and reliability of the heat pump unit; in addition, under different environmental conditions, the heat pump unit can automatically adjust the enthalpy increase liquid extraction method to determine the optimal cooling or heating effect, can adapt to changing working conditions, and further improve the operating reliability of the heat pump unit.

[0075] As mentioned above, when the current degree of supercooling is greater than or equal to the preset threshold, the method of taking liquid upstream by increasing enthalpy can ensure that the fin heat exchanger can fully evaporate, so as to avoid liquid hammer caused by the incompletely evaporated liquid refrigerant entering the compressor, thereby improving the operating reliability of the heat pump unit; in addition, it can also avoid the evaporation efficiency of the fin heat exchanger being too low, thereby improving the overall working energy efficiency of the heat pump unit. When the current degree of supercooling is less than the preset threshold, the method of taking liquid downstream by increasing enthalpy can be used to perform secondary supercooling of the main refrigerant using the economizer, thereby improving the working energy efficiency of the heat pump unit; and it can avoid the refrigerant from partially evaporating before entering the valve or fin heat exchanger, avoiding affecting the accuracy of the valve and the evaporation capacity of the fin heat exchanger, thereby improving the operating reliability of the heat pump unit and improving the overall working energy efficiency of the heat pump unit.

[0076] The present application embodiment provides a heat pump unit control device, referring to Figure 3The heat pump unit control device includes: a processor 31, a memory 32, a communication module 33, an input device 34 and an output device 35. The number of processors in the heat pump unit control device can be one or more, and the number of memories in the heat pump unit control device can be one or more. The processor, memory, communication module, input device and output device of the heat pump unit control device can be connected through a bus or other methods.

[0077] The memory 32, as a computer-readable storage medium, can be used to store software programs, computer executable programs and modules, such as program instructions / modules corresponding to the heat pump unit control method described in any embodiment of the present application. The memory may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data created according to the use of the device, etc. In addition, the memory may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device or other non-volatile solid-state storage device. In some instances, the memory may further include a memory remotely arranged relative to the processor, and these remote memories may be connected to the device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network and a combination thereof.

[0078] The communication module 33 is used for data transmission.

[0079] The processor 31 executes various functional applications and data processing of the device by running the software programs, instructions and modules stored in the memory, that is, realizes the above-mentioned heat pump unit control method.

[0080] The input device 34 may be used to receive input digital or character information and generate key signal input related to user settings and function control of the device. The output device 35 may include a display device such as a display screen.

[0081] The heat pump unit control device provided above can be used to execute the heat pump unit control method provided in the above embodiment, and has corresponding functions and beneficial effects.

[0082] An embodiment of the present application also provides a storage medium storing computer executable instructions, which are used to execute a heat pump unit control method when executed by a computer processor. The heat pump unit control method includes: obtaining a first temperature value through a temperature sensor on a pipe at an output end of the condenser, and obtaining a first pressure value through a pressure sensor on a pipe at an output end of the condenser; determining a current degree of subcooling according to the first temperature value and the first pressure value; when the current degree of subcooling is greater than or equal to a preset threshold, controlling the first solenoid valve to open, and controlling the second solenoid valve to close; when the current degree of subcooling is less than a preset threshold, controlling the first solenoid valve to close, and controlling the second solenoid valve to open.

[0083] Storage medium - any of various types of memory devices or storage devices. The term "storage medium" is intended to include: installation media, such as CD-ROM, floppy disk or tape device; computer system memory or random access memory, such as DRAM, DDR RAM, SRAM, EDO RAM, Rambus RAM, etc.; non-volatile memory, such as flash memory, magnetic media (such as hard disk or optical storage); registers or other similar types of memory elements, etc. Storage media may also include other types of memory or combinations thereof. In addition, the storage medium may be located in the first computer system in which the program is executed, or may be located in a different second computer system, which is connected to the first computer system via a network (such as the Internet). The second computer system can provide program instructions to the first computer for execution. The term "storage medium" may include two or more storage media residing in different locations (for example, in different computer systems connected by a network). The storage medium may store program instructions (for example, embodied as a computer program) that can be executed by one or more processors.

[0084] Of course, the computer executable instructions of a storage medium storing computer executable instructions provided in an embodiment of the present application are not limited to the heat pump unit control method described above, and can also execute related operations in the heat pump unit control method provided in any embodiment of the present application.

[0085] The heat pump unit control device, storage medium and heat pump unit control equipment provided in the above embodiments can execute the heat pump unit control method provided in any embodiment of the present application. For technical details not described in detail in the above embodiments, please refer to the heat pump unit control method provided in any embodiment of the present application.

[0086] The above are only preferred embodiments of the present application and the technical principles used. The present application is not limited to the specific embodiments described herein, and various obvious changes, readjustments and substitutions that can be made by those skilled in the art will not deviate from the scope of protection of the present application. Therefore, although the present application is described in more detail through the above embodiments, the present application is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the claims.

Claims

1. A heat pump unit, characterized in that: include: Fin heat exchanger, compressor, four-way valve, condenser, first combination valve, filter, economizer, main circuit electronic expansion valve, enthalpy increasing electronic expansion valve, first solenoid valve, second solenoid valve and controller; The output end of the fin heat exchanger is connected to the input end of the condenser, the first input end of the compressor and the first output end of the compressor through the four-way valve; The output end of the condenser is connected to the first input end of the first combination valve; The first output end of the first combination valve is connected to the first input end of the economizer and the first end of the first solenoid valve; The first output end of the economizer is connected to the second input end of the compressor, and the second output end of the economizer is connected to the first end of the enthalpy-increasing electronic expansion valve; The second end of the enthalpy-increasing electronic expansion valve is connected to the second end of the first solenoid valve and the first end of the second solenoid valve; The second end of the second solenoid valve is connected to the second input end of the economizer and the first end of the main circuit electronic expansion; The second end of the main electronic expansion valve is connected to the second input end of the first combination valve; The second output end of the first combination valve is connected to the input end of the fin heat exchanger; The controller is connected to the first solenoid valve and the second solenoid valve, and is used to control the first solenoid valve to open and the second solenoid valve to close when the current supercooling degree is greater than or equal to a preset threshold; and to control the first solenoid valve to close and the second solenoid valve to open when the current supercooling degree is less than the preset threshold.

2. The heat pump unit according to claim 1, characterized in that: The heat pump unit also includes a temperature sensor and a pressure sensor; The temperature sensor and the pressure sensor are arranged on a pipe at an output end of the condenser.

3. The heat pump unit according to claim 1, characterized in that: The heat pump unit also includes a first three-way valve; The first end of the first three-way valve is connected to the first output end of the first combination valve; The second end of the first three-way valve is connected to the first end of the first solenoid valve; The third end of the first three-way valve is connected to the first input end of the economizer.

4. The heat pump unit according to claim 3, characterized in that: The first combination valve includes a second three-way valve, a third three-way valve, a fourth three-way valve, a fifth three-way valve, a first check valve, a second check valve, a third check valve and a fourth check valve; The first end of the second three-way valve is connected to the output end of the condenser, the second end of the second three-way valve is connected to the output end of the first one-way valve, and the third end of the second three-way valve is connected to the input end of the second one-way valve; The output end of the second one-way valve is connected to the first end of the third three-way valve; The second end of the third three-way valve is connected to the output end of the third one-way valve, and the third end of the third three-way valve is connected to the first end of the first three-way valve; The first end of the fourth three-way valve is connected to the second end of the main electronic expansion valve, the second end of the fourth three-way valve is connected to the input end of the first one-way valve, and the third end of the fourth three-way valve is connected to the input end of the fourth one-way valve; The output end of the fourth one-way valve is connected to the first end of the fifth three-way valve, the second end of the fifth three-way valve is connected to the input end of the third one-way valve, and the third end of the fifth three-way valve is connected to the input end of the fin heat exchanger.

5. The heat pump unit according to claim 1 or 3, characterized in that: The heat pump unit also includes a sixth three-way valve; The first end of the sixth three-way valve is connected to the second end of the first solenoid valve; The second end of the sixth three-way valve is connected to the second end of the enthalpy-increasing electronic expansion valve; The third end of the sixth three-way valve is connected to the second end of the second solenoid valve.

6. The heat pump unit according to claim 1 or 3, characterized in that: The heat pump unit also includes a seventh three-way valve; The first end of the seventh three-way valve is connected to the second end of the second solenoid valve; The second end of the seventh three-way valve is connected to the second input end of the economizer; The third end of the seventh three-way valve is connected to the first end of the main electronic expansion valve.

7. A heat pump unit control method, characterized in that: A heat pump unit for use in any one of claims 1 to 6, comprising: Acquire a first temperature value through a temperature sensor on a pipe at an output end of the condenser, and acquire a first pressure value through a pressure sensor on a pipe at an output end of the condenser; determining a current degree of supercooling according to the first temperature value and the first pressure value; When the current degree of supercooling is greater than or equal to a preset threshold, the first solenoid valve is controlled to open, and the second solenoid valve is controlled to close; When the current supercooling degree is less than a preset threshold, the first solenoid valve is controlled to be closed, and the second solenoid valve is controlled to be opened.

8. The method according to claim 7, characterized in that The determining the current degree of supercooling according to the first temperature value and the first pressure value includes: Determining a saturated condensation temperature value according to the first pressure value and a preset mapping relationship; The current degree of supercooling is determined according to the difference between the first temperature value and the saturated condensing temperature value.

9. A heat pump unit control device, characterized in that: include: memory and one or more processors; The memory is used to store one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the method according to any one of claims 7 to 8.

10. A storage medium storing computer executable instructions, characterized in that: The computer executable instructions are used to perform the method according to any one of claims 7 to 8 when executed by a processor.

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