A heat pump unit, a heat pump unit control method, a device, and a storage medium

Abstract

Embodiments of the application disclose 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 a first combination valve; the first output end of the first combination valve is connected with the first input end of an economizer and the first end of a first electromagnetic valve; the first output end of the economizer is connected with the second input end of a compressor, and the second output end of the economizer is connected with the first end of an 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 a 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 a main-path electronic expansion valve; the second end of the main-path 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 a fin heat exchanger; and the controller is connected with the first electromagnetic valve and the second electromagnetic valve, and is configured to control the opening and closing of the first electromagnetic valve and the second electromagnetic valve according to the current supercooling degree, so as to solve the problem of poor operation reliability and improve the operation reliability of the heat pump unit.

Description

TECHNICAL FIELD

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

[0002] The air source heat pump unit is a device that uses air as a low-temperature heat source, drives the compressor to operate through a small amount of electric energy, and improves the low-temperature heat energy in the air to high-temperature heat energy to achieve heating. The heat pump unit is widely used in people's work and life based on the advantages of high efficiency and environmental protection.

[0003] In the existing heat pump system, the liquid taking position of enthalpy increase is fixed. With the change of system operating conditions, based on a fixed liquid taking position of enthalpy increase, the efficiency of the heat pump unit may be reduced, and even the compressor liquid knock problem may occur. SUMMARY

[0004] Embodiments of the present application provide a heat pump unit, a heat pump unit control method, equipment and a storage medium, which can solve the technical problem of poor operation reliability of the heat pump unit and improve the operation reliability of the heat pump unit.

[0005] In a first aspect, embodiments of the present application provide a heat pump unit, comprising: a fin heat exchanger, a compressor, a four-way valve, a condenser, a first combination valve, a filter, an economizer, a main route electronic expansion valve, an enthalpy increase electronic expansion valve, a first electromagnetic valve, a second electromagnetic valve and a controller;

[0006] The output end of the fin heat exchanger is connected with 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;

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

[0008] 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;

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

[0010] The second end of the enthalpy increase electronic expansion valve is connected with the second end of the first electromagnetic valve and the first end of the second electromagnetic valve;

[0011] 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 route electronic expansion valve;

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

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

[0014] The controller is connected with the first electromagnetic valve and the second electromagnetic valve, and the controller is configured to control the first electromagnetic valve to open and the second electromagnetic valve to close when the current supercooling degree is greater than or equal to the preset threshold, and control the first electromagnetic valve to close and the second electromagnetic valve to open when the current supercooling degree is less than the preset threshold.

[0015] In an embodiment, the heat pump unit further comprises a temperature sensor and a pressure sensor.

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

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

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

[0019] The second end of the first three-way valve is connected with the first end of the first electromagnetic valve.

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

[0021] In an embodiment, the first combination valve comprises 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] The first end of the second three-way valve is connected with the output end of the condenser, the second end of the second three-way valve is connected with the output end of the first check valve, and the third end of the second three-way valve is connected with the input end of the second check valve.

[0023] The output end of the second check valve is connected with the first end of the third three-way valve.

[0024] The second end of the third three-way valve is connected with the output end of the third check valve, and the third end of the third three-way valve is connected with the first end of the first three-way valve.

[0025] The first end of the fourth three-way valve is connected with the second end of the main route electronic expansion valve, the second end of the fourth three-way valve is connected with the input end of the first check valve, and the third end of the fourth three-way valve is connected with the input end of the fourth check valve.

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

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

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

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

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

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

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

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

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

[0035] In a second aspect, the embodiments of the present application provide a heat pump unit control method, used for the heat pump unit in the first aspect, and the heat pump unit control method comprises:

[0036] obtaining a first temperature value through a temperature sensor on a pipeline of an output end of the condenser, and obtaining a first pressure value through a pressure sensor on the pipeline of the output end of the condenser;

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

[0038] controlling the first electromagnetic valve to open and the second electromagnetic valve to close when the current supercooling degree is greater than or equal to a preset threshold value;

[0039] controlling the first electromagnetic valve to close and the second electromagnetic valve to open when the current supercooling degree is less than the preset threshold value.

[0040] In an embodiment, the determining of the current supercooling degree according to the first temperature value and the first pressure value comprises:

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

[0042] determining the current supercooling degree according to a difference between the first temperature value and the saturated condensing temperature value.

[0043] In a third aspect, the embodiments of the present application provide a heat pump unit control device, comprising:

[0044] a 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 of the second aspect.

[0047] In a fourth aspect, the embodiments of the present application provide a storage medium storing computer executable instructions for executing the heat pump unit control method of the second aspect when executed by a computer processor.

[0048] The embodiments of the present application realize the upstream enthalpy-increasing liquid taking by opening the first electromagnetic valve and closing the second electromagnetic valve, that is, the liquid taking mode of the enthalpy-increasing cycle refrigerant passing through the condenser and then passing through the economizer, and the liquid taking mode of the enthalpy-increasing cycle refrigerant passing through the condenser and then passing through the economizer and then passing through the throttling of the enthalpy-increasing electronic expansion valve, when the current supercooling degree is greater than or equal to the preset threshold value, the upstream enthalpy-increasing liquid taking mode can ensure that the fin heat exchanger can be fully evaporated, so as to avoid the liquid knock caused by the liquid refrigerant not being fully evaporated into the compressor, thereby improving the operation reliability of the heat pump unit; when the first electromagnetic valve is closed and the second electromagnetic valve is opened, the downstream enthalpy-increasing liquid taking is realized, that is, the liquid taking mode of the enthalpy-increasing cycle refrigerant passing through the condenser and then passing through the economizer, and the liquid taking mode of the enthalpy-increasing cycle refrigerant passing through the condenser and then passing through the economizer and then passing through the throttling of the enthalpy-increasing electronic expansion valve, when the current supercooling degree is less than the preset threshold value, the downstream enthalpy-increasing liquid taking mode can utilize the economizer to perform secondary supercooling on the main circuit refrigerant, so as to avoid the refrigerant being partially evaporated before entering the valve or the fin heat exchanger, avoid affecting the precision of the valve and the evaporation capacity of the fin heat exchanger, thereby improving the operation reliability of the heat pump unit; compared with the existing heat pump unit with a fixed enthalpy-increasing liquid taking position, the embodiments of the present application realize the selection of different enthalpy-increasing liquid taking position points when the current supercooling degree is different, so as to change the enthalpy-increasing liquid taking position point according to the actual operation condition, so as to avoid the problems such as compressor liquid knock, thereby improving the operation reliability of the heat pump unit. BRIEF DESCRIPTION OF DRAWINGS

[0049] Figure 1 is a structural schematic diagram of a heat pump unit provided by the embodiments of the present application;

[0050] Figure 2 is a flowchart of a heat pump unit control method provided by the embodiments of the present application;

[0051] Figure 3 is a structural schematic diagram of a heat pump unit control device provided by the embodiments of the present application. DETAILED DESCRIPTION

[0052] To make the objectives, technical solutions, and advantages of this application clearer, specific embodiments of this application will be described in further detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely for explaining this application and not for limiting it. It should also be noted that, for ease of description, only the parts relevant to this application are shown in the drawings, not all of them. Before discussing exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although the flowcharts describe operations (or steps) as sequential processes, many of these operations can be performed in parallel, concurrently, or simultaneously. Furthermore, the order of the operations can be rearranged. The process can be terminated when its operation is completed, but may also have additional steps not included in the drawings. The process can correspond to a method, function, procedure, subroutine, subprogram, etc.

[0053] In existing heat pump systems, the liquid sampling point for enthalpy increase is fixed. As system operating conditions change, relying on a fixed liquid sampling point for enthalpy increase may lead to a decrease in the efficiency of the heat pump unit, or even problems such as compressor liquid slugging.

[0054] Based on this, the heat pump unit, heat pump unit control method, equipment, and storage medium provided in this application embodiment are intended to achieve the following when controlling the heat pump unit: When the current subcooling is greater than or equal to a preset threshold, liquid is taken upstream of the enthalpy-increasing cycle by opening the first solenoid valve and closing the second solenoid valve. This means that the enthalpy-increasing circulating refrigerant, after passing through the condenser and before entering the economizer, is throttled by the enthalpy-increasing electronic expansion valve. This ensures that the finned heat exchanger can fully evaporate, thereby preventing liquid slugging caused by incompletely evaporated liquid refrigerant entering the compressor, thus improving the operational reliability of the heat pump unit. When the current subcooling is less than the preset threshold, liquid is taken downstream of the enthalpy-increasing cycle by closing the first solenoid valve and opening the second solenoid valve. After entering the economizer, the refrigerant is throttled by an enthalpy-increasing electronic expansion valve. This allows for secondary subcooling of the main refrigerant using the economizer, preventing partial evaporation before it enters the valves or finned heat exchangers. This avoids affecting the valve precision and the evaporation capacity of the finned heat exchangers, thereby improving the operational reliability of the heat pump unit. Compared to existing heat pump units with fixed enthalpy-increasing liquid collection points, this embodiment adds corresponding first and second solenoid valves to the heat pump unit. This allows for selection of different enthalpy-increasing liquid collection points based on varying subcooling levels, enabling adjustments to the enthalpy-increasing liquid collection point according to actual operating conditions. This avoids problems such as compressor liquid slugging, further improving the operational reliability of the heat pump unit.

[0055] Figure 1 This is a schematic diagram of the structure of a heat pump unit provided in an embodiment of this application, with reference to... Figure 1The heat pump unit includes: a finned 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 of the finned heat exchanger 11 is connected to the input of the condenser 14, the first input of the compressor 12, and the first output of the compressor 12 via the four-way valve 13. The output of the condenser 14 is connected to the first input of the first combination valve 15. The first output of the first combination valve 15 is connected to the first input of the economizer 16 and the first end of the first solenoid valve 19. The first output of the economizer 16 is connected to the second input of the compressor 12, and the second output 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 finned heat exchanger 11. The controller is connected to the first solenoid valve 19 and the second solenoid valve 20. The controller is used to control the first solenoid valve 19 to open and the second solenoid valve 20 to close when the current subcooling is greater than or equal to a preset threshold; and to control the first solenoid valve 19 to close and the second solenoid valve 20 to open when the current subcooling 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 pressure sensor 22 are installed on the pipe at the output end of the condenser 14. The temperature sensor 21 can detect a first temperature value at the output end of the condenser 14, and the pressure sensor 22 can detect a first pressure value at the output end of the condenser 14. The saturated condensing temperature value corresponding to the current pressure value can be determined based on the first pressure value. Therefore, the current subcooling can be obtained based on the difference between the first temperature value and the saturated condensing temperature value. Subsequently, the opening and closing of the first solenoid valve 19 and the second solenoid valve 20 can be controlled according to the current subcooling to achieve upstream or downstream liquid extraction for enthalpy increase. Compared with existing heat pump units with fixed enthalpy extraction locations, this embodiment selects different enthalpy extraction locations when the current subcooling is different. This allows for changes in the enthalpy extraction location based on actual operating conditions, avoiding problems such as liquid slugging in the compressor 12, thereby improving the operational reliability of the heat pump unit.

[0057] In one embodiment, the heat pump unit further includes a first three-way valve 23. The first end of the first three-way valve 23 is connected to the first output end of the first combination valve 15, the second end of the first three-way valve 23 is connected to the first end of the first solenoid valve 19, and the third end of the first three-way valve 23 is connected to the 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 one-way valve 155, a second one-way valve 156, a third one-way valve 157, and a fourth one-way 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 one-way valve 155, and the third end of the second three-way valve 151 is connected to the input end of the second one-way valve 156. The output end of the second one-way 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 one-way 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 circuit 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 finned heat exchanger 11. The first combined valve 15 achieves orderly diversion of the main circuit refrigerant, improving the orderly circulation of the main circuit refrigerant.

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

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

[0061] As described above, by setting a first solenoid valve and a second solenoid valve in the heat pump unit, when the first solenoid valve is open and the second solenoid valve is closed, liquid is drawn upstream of the enthalpy-increasing cycle. That is, the enthalpy-increasing cycle refrigerant passes through the condenser and enters the economizer, and is then throttled by the enthalpy-increasing electronic expansion valve for liquid draw. When the current subcooling is greater than or equal to a preset threshold, this upstream liquid draw ensures that the finned heat exchanger can fully evaporate, thereby avoiding liquid slugging caused by incompletely evaporated liquid refrigerant entering the compressor, thus improving the operational reliability of the heat pump unit. When the first solenoid valve is closed and the second solenoid valve is open, liquid is drawn downstream of the enthalpy-increasing cycle. That is, after the enthalpy-increasing cycle refrigerant passes through the condenser and enters the economizer, it is then throttled by the enthalpy-increasing electronic expansion valve for liquid draw. This method involves using downstream liquid extraction at a lower enthalpy level when the current subcooling is below a preset threshold. This allows for secondary subcooling of the main refrigerant via an economizer, preventing partial evaporation of the refrigerant before it enters the valves or finned heat exchangers. This avoids affecting the valve precision and the evaporation capacity of the finned heat exchangers, thereby improving the operational reliability of the heat pump unit. Compared to existing heat pump units with fixed enthalpy extraction locations, this embodiment adds corresponding first and second solenoid valves to the heat pump unit. This allows for selection of different enthalpy extraction locations based on varying subcooling levels, enabling adjustments to the extraction location according to actual operating conditions. This avoids issues such as compressor liquid slugging, further enhancing the operational reliability of the heat pump unit.

[0062] Figure 2 A flowchart of a heat pump unit control method provided in an embodiment of this 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 consist of two or more physical entities, or it can consist of a single physical entity. Generally, the heat pump unit control device can be a controller for the heat pump unit.

[0063] The following description uses the controller in a heat pump unit as the main entity executing the heat pump unit control method as an example. (Refer to...) 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. Obtain a first temperature value through a temperature sensor on the pipe at the output end of the condenser, and obtain a first pressure value through a pressure sensor on the pipe at the output end of the condenser.

[0065] A temperature sensor installed on the pipe at the condenser's output end detects the temperature to obtain a first temperature value; a pressure sensor installed on the same pipe detects the pressure to obtain a first pressure value. These first temperature and pressure values ​​at the condenser's output end are transmitted to the heat pump unit's controller. The controller receives the sensor data (i.e., the first temperature and pressure values) to calculate the corresponding current subcooling, and then controls the opening and closing of the first and second solenoid valves based on this subcooling.

[0066] S102. Determine the current subcooling based on the first temperature value and the first pressure value.

[0067] The current saturated condensing temperature is determined based on the first pressure value detected by the pressure sensor and a preset mapping relationship. The current subcooling is determined based on the difference between the currently measured first temperature value and the current saturated condensing temperature value. For example, the current saturated condensing temperature value is calculated using the formula: Tsubcooling = Tcondensate outlet - Tsaturated condensing, where Tsaturated condensing is the saturated condensing temperature of the refrigerant at the current pressure, Tcondensate outlet is the actual temperature at the condenser outlet (i.e., the first temperature value), and Tsubcooling is the current saturated condensing temperature value.

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

[0069] The subcooling at the condenser output is monitored in real time by temperature and pressure sensors. When the current subcooling is greater than or equal to a preset threshold, such as 5°C or higher, the first solenoid valve is opened and the second solenoid valve is closed. The heat pump unit employs upstream liquid extraction for enthalpy enhancement, meaning that the enthalpy-enhancing circulating refrigerant, after passing through the condenser and before entering the economizer, is throttled by an enthalpy-enhancing electronic expansion valve. Using upstream liquid extraction when the current subcooling is greater than or equal to the preset threshold ensures sufficient evaporation in the finned heat exchanger, thus preventing liquid slugging caused by incompletely evaporated liquid refrigerant entering the compressor, thereby improving the operational reliability of the heat pump unit. Furthermore, it prevents excessively low evaporation efficiency of the finned heat exchanger, further enhancing the overall energy efficiency of the heat pump unit.

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

[0071] S104. When the current subcooling is less than the preset threshold, control the first solenoid valve to close and control the second solenoid valve to open.

[0072] The subcooling at the condenser output is monitored in real time by temperature and pressure sensors. When the current subcooling is less than a preset threshold, such as less than 5°C, the first solenoid valve is closed and the second solenoid valve is opened. The heat pump unit then performs downstream liquid extraction with increased enthalpy. This means that the refrigerant, after passing through the condenser and entering the economizer, is then throttled by the enthalpy-increasing electronic expansion valve for liquid extraction. Using downstream liquid extraction with increased enthalpy when the current subcooling is less than the preset threshold allows for secondary subcooling of the main refrigerant using the economizer, thereby improving the heat pump unit's operating efficiency. Furthermore, it prevents partial evaporation of the refrigerant before it enters the valves or finned heat exchangers, avoiding impacts on valve precision and the evaporation capacity of the finned heat exchangers, thus improving the operational reliability and overall operating efficiency of the heat pump unit.

[0073] After switching the enthalpy-increasing liquid sampling point, i.e. after executing the above steps S103 or S104, the current subcooling is monitored by temperature and pressure sensors, and the enthalpy-increasing liquid sampling point is dynamically adjusted based on the real-time monitored data, i.e., the opening and closing of the first and second solenoid valves are dynamically controlled to ensure the efficient operation of the heat pump unit.

[0074] As described above, by real-time detection and dynamic adjustment of the enthalpy-increasing liquid intake point, the operating status of the heat pump unit is optimized, energy loss is reduced, and thus the working efficiency of the heat pump unit is improved. Furthermore, by dynamically adjusting the enthalpy-increasing liquid intake point, problems such as liquid slugging, insufficient or excessive undercooling caused by the existing fixed liquid intake method are avoided, thereby improving the operational stability and reliability of the heat pump unit. In addition, under different environmental conditions, the heat pump unit can automatically adjust the enthalpy-increasing liquid intake method to determine the optimal cooling or heating effect, adapting to changing operating conditions and further improving the operational reliability of the heat pump unit.

[0075] As described above, when the current subcooling is greater than or equal to the preset threshold, using the upstream liquid extraction method with increased enthalpy ensures that the finned heat exchanger can fully evaporate, thus preventing liquid slugging caused by incompletely evaporated liquid refrigerant entering the compressor, thereby improving the operational reliability of the heat pump unit. Furthermore, it also prevents the evaporation efficiency of the finned heat exchanger from being too low, thereby improving the overall operating efficiency of the heat pump unit. When the current subcooling is less than the preset threshold, using the downstream liquid extraction method with increased enthalpy allows for secondary subcooling of the main refrigerant using an economizer, thereby improving the operating efficiency of the heat pump unit. Moreover, it prevents the refrigerant from partially evaporating before entering the valves or finned heat exchanger, avoiding impact on the valve precision and the evaporation capacity of the finned heat exchanger, thus improving the operational reliability and overall operating efficiency of the heat pump unit.

[0076] This application 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 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 via a bus or other means.

[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 this application. The memory may primarily include a program storage area and a data storage area. The program storage area may store the operating system and at least one application program required for a function; the data storage area may store data created based on the use of the device, etc. Furthermore, the memory may include high-speed random access memory and non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device. In some instances, the memory may further include memory remotely located relative to the processor, and these remote memories can be connected to the device via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations 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 software programs, instructions and modules stored in the memory, thereby realizing the above-mentioned heat pump unit control method.

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

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

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

[0083] Storage medium – any type of memory device or storage device. The term “storage medium” is intended to include: mounting media, such as CD-ROM, floppy disk, or magnetic tape devices; 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 (e.g., hard disk or optical storage); registers or other similar types of memory elements, etc. Storage medium may also include other types of memory or combinations thereof. Furthermore, storage medium may reside in a first computer system in which the program is executed, or it may reside in a different second computer system 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” can include two or more storage media residing in different locations (e.g., in different computer systems connected via a network). Storage medium may store program instructions (e.g., specifically implemented as a computer program) executable by one or more processors.

[0084] Of course, the computer-executable instructions stored in the storage medium provided in the embodiments of this application are not limited to the heat pump unit control method described above, but can also perform related operations in the heat pump unit control method provided in any embodiment of this 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 this 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 this application.

[0086] The above description is merely a preferred embodiment and the technical principles employed in this application. This 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 depart from the scope of protection of this application. Therefore, although this application has been described in detail through the above embodiments, this application is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of this application, the scope of which is determined by the scope of the claims.

Claims

1. A control method for a heat pump unit, characterized in that, For use in heat pump units, the heat pump unit includes: finned heat exchanger, compressor, four-way valve, condenser, first combination valve, filter, economizer, main electronic expansion valve, enthalpy-increasing electronic expansion valve, first solenoid valve, second solenoid valve, temperature sensor, pressure sensor and controller; The output end of the finned 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 via 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 terminal of the first combined valve is connected to the first input terminal of the economizer and the first terminal of the first solenoid valve. The first output terminal of the economizer is connected to the second input terminal of the compressor, and the second output terminal of the economizer is connected to the first terminal 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 circuit electronic expansion valve is connected to the second input end of the first combination valve; The second output terminal of the first combined valve is connected to the input terminal of the finned heat exchanger; The temperature sensor and the pressure sensor are mounted on the pipe at the output end of the condenser; 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 subcooling 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 subcooling is less than the preset threshold. The method includes: The first temperature value is obtained by a temperature sensor on the pipe at the output end of the condenser, and the first pressure value is obtained by a pressure sensor on the pipe at the output end of the condenser. The current degree of subcooling is determined based on the first temperature value and the first pressure value; When the current subcooling degree is greater than or equal to a preset threshold, the first solenoid valve is opened and the second solenoid valve is closed. When the current subcooling is less than a preset threshold, the first solenoid valve is closed and the second solenoid valve is opened.

2. The method 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.

3. The method according to claim 2, 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 finned heat exchanger.

4. The method according to claim 1 or 2, 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.

5. The method according to claim 1 or 2, 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.

6. The method according to claim 1, characterized in that, Determining the current subcooling based on the first temperature value and the first pressure value includes: The saturated condensation temperature value is determined based on the first pressure value and the preset mapping relationship; The current subcooling is determined based on the difference between the first temperature value and the saturated condensation temperature value.

7. 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 as described in any one of claims 1-6.

8. A storage medium for storing computer-executable instructions, characterized in that, The computer-executable instructions, when executed by a processor, are used to perform the method as described in any one of claims 1-6.

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