Control method and device of heat pump unit, computer equipment and storage medium

Abstract

The application relates to a control method and device of a heat pump unit, computer equipment, a storage medium and a computer program product. The heat pump unit comprises a plate heat exchanger, a first three-way connecting piece, a second three-way connecting piece, an enthalpy-increasing electronic expansion valve, an electromagnetic two-way valve, a third three-way connecting piece and a compressor. The method comprises the following steps: judging whether the unit defrosting is finished; if the unit defrosting is finished, controlling the opening and closing of the electromagnetic two-way valve according to the exhaust gas superheat degree and the opening degree of the enthalpy-increasing electronic expansion valve. In the time when the enthalpy-increasing electronic expansion valve is not started after the unit defrosting is finished, the electromagnetic two-way valve is started, liquid is sprayed into the high-pressure cavity of the compressor, the exhaust gas rising speed is slowed down, the unit frequency reduction caused by the excessively high exhaust gas temperature can be avoided, and the unit capacity can be ensured.

Description

Technical Field

[0001] This application relates to the field of heat pump technology, and in particular to a heat pump unit control method, device, computer equipment, storage medium, and computer program product. Background Technology

[0002] Heat pump water heating technology is a hot water supply method based on heat pump technology. Due to its advantages such as energy saving, environmental protection, and energy conservation, it has a promising future. Because of the latent heat property of R32 refrigerant, heat pump units using R32 refrigerant have higher energy efficiency under the same conditions and are widely used.

[0003] Reference Figure 1 As shown, in the existing heat pump unit, liquid refrigerant flows out from the lower outlet of plate heat exchanger 1'. Part of the liquid refrigerant enters the main refrigerant path through the second outlet of the first three-way connector 2' and flows to the finned heat exchanger 5'. Part of the liquid refrigerant flows into the auxiliary refrigerant path through the first outlet of the first three-way connector 2' and flows to the gas injection port of compressor 4' through the enthalpy-increasing electronic expansion valve 3'.

[0004] In ultra-low temperature heating conditions, heat pump units using R32 refrigerant often undergo a defrosting process. Upon defrosting completion, the exhaust superheat builds up too quickly. To ensure sufficient unit circulation, the enthalpy-increasing electronic expansion valve cannot open, resulting in excessively high exhaust temperatures. This triggers the unit's frequency reduction logic, and the reduced frequency further decreases the circulation volume. Even with the enthalpy-increasing electronic expansion valve fully open, the refrigerant flow is too small, and even opening it to its maximum cannot reduce exhaust temperature, necessitating a shutdown and disrupting normal unit operation. Summary of the Invention

[0005] Therefore, it is necessary to provide a control method, device, computer equipment, computer-readable storage medium, and computer program product for a heat pump unit to address the aforementioned technical problems.

[0006] A first aspect provides a control method for a heat pump unit, the heat pump unit comprising a plate heat exchanger, a first three-way connector, a second three-way connector, an enthalpy-increasing electronic expansion valve, a solenoid two-way valve, a third three-way connector, and a compressor. The inlet of the first three-way connector is connected to the lower outlet of the plate heat exchanger; the inlet of the second three-way connector is connected to the first outlet of the first three-way connector; the enthalpy-increasing electronic expansion valve is connected to the first outlet of the second three-way connector; the solenoid two-way valve is connected to the second outlet of the second three-way connector; the first inlet of the third three-way connector is connected to the solenoid two-way valve; the second inlet of the third three-way connector is connected to the upper outlet of the plate heat exchanger; and the compressor's gas inlet is connected to the outlet of the third three-way connector. The method includes:

[0007] Determine whether the unit defrosting is complete;

[0008] Once the unit defrosting is complete, the opening and closing of the solenoid two-way valve is controlled based on the exhaust superheat and the opening degree of the enthalpy-increasing electronic expansion valve.

[0009] In one embodiment, controlling the opening and closing of the solenoid two-way valve based on the exhaust superheat and the opening degree of the enthalpy-increasing electronic expansion valve includes:

[0010] Detect the exhaust superheat and the opening degree of the enthalpy-increasing electronic expansion valve;

[0011] If the exhaust superheat is greater than a preset threshold and the opening of the enthalpy-increasing electronic expansion valve is 0, the electromagnetic two-way valve is opened.

[0012] If the exhaust superheat is greater than the preset threshold and the opening of the enthalpy-increasing electronic expansion valve is not 0, the electromagnetic two-way valve is closed.

[0013] In one embodiment, the method further includes:

[0014] If the electromagnetic two-way valve is closed, the opening of the enthalpy-increasing electronic expansion valve is adjusted according to the exhaust temperature and the outlet water temperature.

[0015] In one embodiment, adjusting the opening of the enthalpy-increasing electronic expansion valve based on the exhaust temperature and the outlet water temperature includes:

[0016] Detect exhaust temperature and outlet water temperature;

[0017] If the exhaust temperature is lower than the unit's frequency reduction temperature, adjust the opening of the enthalpy-increasing electronic expansion valve according to the exhaust superheat.

[0018] If the exhaust temperature is greater than the unit's frequency reduction temperature and the exhaust superheat is too large, increase the opening of the enthalpy-increasing electronic expansion valve.

[0019] In one embodiment, adjusting the opening of the enthalpy-increasing electronic expansion valve based on the exhaust superheat if the exhaust temperature is lower than the unit's frequency reduction temperature includes:

[0020] If the exhaust temperature remains below the unit's frequency reduction temperature for 2 minutes and the exhaust superheat is less than or equal to the first temperature, the enthalpy-increasing electronic expansion valve shall be closed.

[0021] If the exhaust temperature remains below the unit's frequency reduction temperature for 2 minutes, and the first temperature < exhaust superheat ≤ second temperature, the enthalpy-increasing electronic expansion valve will be reduced by 8 steps every 15 seconds.

[0022] If the exhaust temperature remains below the unit's frequency reduction temperature for 1 minute, and the second temperature < exhaust superheat ≤ third temperature, the enthalpy-increasing electronic expansion valve will be increased by 10 steps every 30 seconds.

[0023] In one embodiment, if the exhaust temperature is greater than the unit's frequency reduction temperature and the exhaust superheat is excessive, increasing the opening of the enthalpy-increasing electronic expansion valve includes:

[0024] If the exhaust temperature remains higher than the unit's frequency reduction temperature for 1 minute, and the exhaust superheat is greater than the third temperature, the enthalpy-increasing electronic expansion valve will be opened by 20 steps, and then increased by 8 steps every 15 seconds.

[0025] Secondly, a control device for a heat pump unit is provided. The heat pump unit includes a plate heat exchanger, a first three-way connector, a second three-way connector, an enthalpy-increasing electronic expansion valve, a solenoid two-way valve, a third three-way connector, and a compressor. The inlet of the first three-way connector is connected to the lower outlet of the plate heat exchanger; the inlet of the second three-way connector is connected to the first outlet of the first three-way connector; the enthalpy-increasing electronic expansion valve is connected to the first outlet of the second three-way connector; the solenoid two-way valve is connected to the second outlet of the second three-way connector; the first inlet of the third three-way connector is connected to the solenoid two-way valve; the second inlet of the third three-way connector is connected to the upper outlet of the plate heat exchanger; and the compressor is connected to the outlet of the third three-way connector. The device includes:

[0026] The defrosting judgment module is used to determine whether the unit defrosting has ended;

[0027] The electromagnetic two-way valve control module is used to control the opening and closing of the electromagnetic two-way valve based on the exhaust superheat and the opening degree of the enthalpy-increasing electronic expansion valve when the unit defrosting is completed.

[0028] Thirdly, a computer device is provided, including a memory and a processor, the memory storing a computer program, the processor executing the computer program to implement the steps of any of the preceding methods.

[0029] Fourthly, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the methods described above.

[0030] Fifthly, a computer program product is provided, comprising a computer program that, when executed by a processor, implements the steps of any of the methods described above.

[0031] The control method, device, computer equipment, storage medium, and computer program product of the above-mentioned heat pump unit, during the time before the enthalpy-increasing electronic expansion valve is opened after the unit defrosts, opens the solenoid two-way valve to spray liquid into the high-pressure chamber of the compressor, slows down the exhaust gas rising speed, avoids excessive exhaust temperature causing the unit to reduce frequency, and ensures the unit's capacity. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of an existing heat pump unit;

[0033] Figure 2 This is a schematic diagram of the structure of a heat pump unit according to an embodiment of the present invention;

[0034] Figure 3 for Figure 2 A schematic diagram of the middle section structure;

[0035] Figure 4 This is a schematic flowchart illustrating a control method for a heat pump unit according to an embodiment of the present invention.

[0036] Figure 5 This is a schematic flowchart illustrating a control method for a heat pump unit according to an embodiment of the present invention.

[0037] Figure 6 This is a block diagram of a control device according to an embodiment of the present invention. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0039] In existing heat pump units, the exhaust superheat builds up too quickly after defrosting, but the enthalpy-increasing electronic expansion valve requires a certain period to open, resulting in uncontrollable exhaust temperature, triggering unit frequency reduction, and affecting normal operation. Therefore, this invention adds a three-way connector and a solenoid two-way valve to the plate heat exchanger and the enthalpy-increasing electronic expansion valve. The outlet of the solenoid two-way valve is connected to the compressor's gas supply port. After defrosting, once the exhaust superheat reaches the required level, the solenoid two-way valve opens, allowing some liquid refrigerant to flow through the three-way connector to the compressor's gas supply port, thereby regulating the exhaust temperature.

[0040] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0041] like Figure 2 , 3As shown, a heat pump unit according to an embodiment of the present invention includes a plate heat exchanger 1, a first three-way connector 2, a second three-way connector 3, an enthalpy-increasing electronic expansion valve 4, a solenoid two-way valve 5, a third three-way connector 6, and a compressor 7. The inlet of the first three-way connector 2 is connected to the lower outlet of the plate heat exchanger 1, the inlet of the second three-way connector 3 is connected to the first outlet of the first three-way connector 2, the enthalpy-increasing electronic expansion valve 4 is connected to the first outlet of the second three-way connector 3, the solenoid two-way valve 5 is connected to the second outlet of the second three-way connector 3, the first inlet of the third three-way connector 6 is connected to the solenoid two-way valve 5, the second inlet of the third three-way connector 6 is connected to the upper outlet of the plate heat exchanger 1, and the air inlet of the compressor 7 is connected to the outlet of the third three-way connector 6.

[0042] In this embodiment, liquid refrigerant flows out from the lower outlet of plate heat exchanger 1. Part of the refrigerant enters the main refrigerant path and flows to the finned heat exchanger via the second outlet of the first three-way connector 2, while the remaining liquid refrigerant flows into the auxiliary refrigerant path via the first outlet of the first three-way connector 2. After defrosting, to ensure circulation, the enthalpy-increasing electronic expansion valve 4 remains closed for a certain period T0. During this time, if the exhaust superheat reaches the opening point of the enthalpy-increasing electronic expansion valve 4, the solenoid two-way valve 5 is opened to adjust the exhaust superheat. At this time, liquid refrigerant flows from the second outlet of the second three-way connector 3 to the first inlet of the third three-way connector 6, and then from the outlet of the third three-way connector 6 to the air supply port of the compressor 7. After time T0, if the exhaust superheat is still greater than the opening point of the enthalpy-increasing electronic expansion valve 4, the solenoid two-way valve 5 is closed, and the enthalpy-increasing electronic expansion valve 4 is opened for adjustment. At this time, the liquid refrigerant flows from the first outlet of the second three-way connector 3 to the second inlet of the third three-way connector 6, and then from the outlet of the third three-way connector 6 to the gas supply port of the compressor 7. Therefore, the heat pump unit of this embodiment can reduce exhaust gas volume during the time after defrosting when the enthalpy-increasing electronic expansion valve is not open, avoiding frequency reduction due to excessively high exhaust temperature, which could affect the unit's performance.

[0043] like Figure 4 As shown, a control method for a heat pump unit according to an embodiment of the present invention includes the following steps:

[0044] Step S402: Determine whether the unit defrosting is complete.

[0045] In some embodiments, the defrosting status of the unit is determined based on the coil temperature of the finned heat exchanger. Specifically, the coil temperature of the finned heat exchanger is detected, and if the coil temperature is higher than the defrosting set coil exit temperature, the defrosting of the unit is determined to be complete.

[0046] In step S404, if the unit defrosting is completed, the opening and closing of the solenoid two-way valve 5 is controlled according to the exhaust superheat and the opening degree of the enthalpy-increasing electronic expansion valve 4.

[0047] In some embodiments, exhaust superheat = exhaust temperature - outlet water temperature. After defrosting, the exhaust superheat builds up relatively quickly. Simultaneously, to ensure circulation volume, the enthalpy-increasing electronic expansion valve 4 remains closed for a certain period T0, potentially leading to uncontrollable exhaust temperature. To avoid this situation causing unit frequency reduction, this invention controls the solenoid two-way valve 5 based on the exhaust superheat and the opening degree of the enthalpy-increasing electronic expansion valve 4 after unit defrosting.

[0048] In one embodiment, controlling the opening and closing of the solenoid two-way valve 5 based on the exhaust superheat and the opening degree of the enthalpy-increasing electronic expansion valve 4 includes:

[0049] Step S502: Detect the exhaust superheat and the opening of the enthalpy-increasing electronic expansion valve 4;

[0050] Step S504: If the exhaust superheat is greater than the preset threshold and the opening of the enthalpy-increasing electronic expansion valve 4 is 0, open the solenoid two-way valve 5.

[0051] Step S506: If the exhaust superheat is greater than the preset threshold and the opening of the enthalpy-increasing electronic expansion valve 4 is not 0, close the solenoid two-way valve 5.

[0052] In some embodiments, the exhaust superheat and the opening degree of the enthalpy-increasing electronic expansion valve 4 are detected every 30 seconds. The preset threshold is the critical value at which the enthalpy-increasing electronic expansion valve 4 opens; that is, under normal circumstances, the enthalpy-increasing electronic expansion valve 4 opens when the exhaust superheat is greater than the preset threshold. However, after defrosting, in order to ensure circulation volume, the enthalpy-increasing electronic expansion valve 4 does not open for a certain period of time T0. That is, even if the exhaust superheat is greater than the preset threshold, the enthalpy-increasing electronic expansion valve 4 does not open during the T0 period after defrosting. In this invention, in order to ensure exhaust control during this period, the opening and closing of the solenoid two-way valve 5 is controlled. Specifically, if the exhaust superheat is greater than the preset threshold and the opening degree of the enthalpy-increasing electronic expansion valve 4 is 0, the solenoid two-way valve 5 is opened; if the exhaust superheat is greater than the preset threshold and the opening degree of the enthalpy-increasing electronic expansion valve 4 is not 0, the solenoid two-way valve 5 is closed.

[0053] In one embodiment, such as Figure 5 As shown, the control method for the heat pump unit of the present invention further includes:

[0054] In step S406, if the solenoid two-way valve 5 is closed, adjust the opening of the enthalpy-increasing electronic expansion valve 4 according to the exhaust temperature and the outlet water temperature.

[0055] In some embodiments, when the electromagnetic two-way valve 5 is closed, the enthalpy-increasing electronic expansion valve 4 has already opened, indicating that the heat pump unit has been running for more than T0 time after defrosting. At this time, the enthalpy-increasing electronic expansion valve 4 is controlled to adjust the exhaust superheat.

[0056] In one embodiment, adjusting the opening of the enthalpy-increasing electronic expansion valve 4 according to the exhaust temperature and the outlet water temperature includes:

[0057] Step S602: Detect the exhaust temperature and the outlet water temperature;

[0058] Step S604: If the exhaust temperature is lower than the unit frequency reduction temperature, adjust the opening of the enthalpy-increasing expansion valve 4 according to the exhaust superheat.

[0059] Step S606: If the exhaust temperature is greater than the unit's frequency reduction temperature and the exhaust superheat is too large, increase the opening of the enthalpy-increasing electronic expansion valve 4.

[0060] In some embodiments, the exhaust temperature and outlet water temperature are detected every 30 seconds; the unit's frequency reduction temperature is 90°C, but the specific temperature varies depending on the unit. During the operation of the heat pump unit, the exhaust superheat needs to be maintained within a certain range, which varies depending on the unit, generally around 20-25°C. Furthermore, to protect the unit, when the exhaust temperature reaches a certain level, the unit's frequency reduction logic is triggered, causing a decrease in unit capacity. Based on this, the present invention adjusts the enthalpy-increasing electronic expansion valve 4 according to the exhaust temperature and exhaust superheat to ensure unit capacity.

[0061] In one embodiment, if the exhaust temperature is lower than the unit's frequency reduction temperature, adjusting the opening of the enthalpy-increasing electronic expansion valve 4 according to the exhaust superheat includes:

[0062] Step S702: If the exhaust temperature remains below the unit's frequency reduction temperature for 2 minutes and the exhaust superheat is ≤ the first temperature, close the enthalpy-increasing electronic expansion valve 4.

[0063] Step S704: If the exhaust temperature remains below the unit's frequency reduction temperature for 2 minutes, and the first temperature < exhaust superheat ≤ second temperature, reduce the enthalpy-increasing electronic expansion valve 4 by 8 steps every 15 seconds.

[0064] Step S706: If the exhaust temperature remains below the unit's frequency reduction temperature for 1 minute, and the second temperature < exhaust superheat ≤ third temperature, adjust the enthalpy-increasing electronic expansion valve 4 by 10 steps every 30 seconds.

[0065] In some embodiments, the first temperature is 10°C, the second temperature is 26°C, and the third temperature is 35°C. When the exhaust superheat is ≤ the first temperature, there is a risk of liquid return from the compressor, therefore the enthalpy-increasing electronic expansion valve 4 is closed. When the exhaust superheat is greater than the first temperature, the enthalpy-increasing electronic expansion valve is adjusted according to a preset range of exhaust superheat.

[0066] In one embodiment, if the exhaust temperature is higher than the unit's frequency reduction temperature and the exhaust superheat is excessive, the opening of the enthalpy-increasing electronic expansion valve 4 is increased, including:

[0067] In step S802, if the exhaust temperature remains higher than the unit's frequency reduction temperature for 1 minute and the exhaust superheat is greater than the third temperature, the enthalpy-increasing electronic expansion valve 4 will be opened by 20 steps, and then increased by 8 steps every 15 seconds.

[0068] In one embodiment, the control method for a heat pump unit provided by the present invention includes the following steps:

[0069] Step S901: Determine whether the unit defrosting is complete;

[0070] Step S902: If the unit defrosting is completed, check the exhaust superheat and the opening of the enthalpy-increasing electronic expansion valve 4.

[0071] Step S903: If the exhaust superheat is greater than the preset threshold and the opening degree 4 of the enthalpy-increasing electronic expansion valve is 0, open the solenoid two-way valve 5.

[0072] Step S904: If the exhaust superheat is greater than the preset threshold and the opening of the enthalpy-increasing electronic expansion valve 4 is not 0, close the solenoid two-way valve 5.

[0073] Step S905: If the solenoid two-way valve 5 is closed, check the exhaust temperature and the outlet water temperature;

[0074] Step S906: If the exhaust temperature remains below the unit's frequency reduction temperature for 2 minutes and the exhaust superheat is ≤ the first temperature, close the enthalpy-increasing electronic expansion valve 4.

[0075] Step S907: If the exhaust temperature remains below the unit's frequency reduction temperature for 2 minutes, and the first temperature < exhaust superheat ≤ second temperature, the enthalpy-increasing electronic expansion valve 4 will be reduced by 8 steps every 15 seconds.

[0076] Step S908: If the exhaust temperature remains below the unit's frequency reduction temperature for 1 minute, and the second temperature < exhaust superheat ≤ third temperature, adjust the enthalpy-increasing electronic expansion valve 4 by 10 steps every 30 seconds.

[0077] Step S909: If the exhaust temperature remains higher than the unit's frequency reduction temperature for 1 minute and the exhaust superheat is greater than the third temperature, open the enthalpy-increasing electronic expansion valve 4 by 20 steps, and then increase it by 8 steps every 15 seconds.

[0078] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0079] Based on the same inventive concept, this application also provides a control device for a heat pump unit to implement the control method of the heat pump unit involved above. The solution provided by this device is similar to the solution described in the above method. Therefore, the specific limitations of one or more control device embodiments of heat pump units provided below can be found in the limitations of the control method of heat pump units above, and will not be repeated here.

[0080] In one embodiment, such as Figure 6 As shown, this invention provides a control device for a heat pump unit. The heat pump unit includes a plate heat exchanger, a first three-way connector, a second three-way connector, an enthalpy-increasing electronic expansion valve, a solenoid two-way valve, a third three-way connector, and a compressor. The inlet of the first three-way connector is connected to the lower outlet of the plate heat exchanger; the inlet of the second three-way connector is connected to the first outlet of the first three-way connector; the enthalpy-increasing electronic expansion valve is connected to the first outlet of the second three-way connector; the solenoid two-way valve is connected to the second outlet of the second three-way connector; the first inlet of the third three-way connector is connected to the solenoid two-way valve; the second inlet of the third three-way connector is connected to the upper outlet of the plate heat exchanger; and the compressor is connected to the outlet of the third three-way connector. The control device includes:

[0081] The defrosting judgment module 1002 is used to determine whether the unit defrosting has ended;

[0082] The electromagnetic two-way valve control module 1004 is used to control the opening and closing of the electromagnetic two-way valve based on the exhaust superheat and the opening degree of the enthalpy-increasing electronic expansion valve when the unit defrosting is completed.

[0083] In one embodiment, the electromagnetic two-way valve control module 1004 is further configured to detect the exhaust superheat and the opening degree of the enthalpy-increasing electronic expansion valve; if the exhaust superheat is greater than a preset threshold and the opening degree of the enthalpy-increasing electronic expansion valve is 0, the electromagnetic two-way valve is opened; if the exhaust superheat is greater than the preset threshold and the opening degree of the enthalpy-increasing electronic expansion valve is not 0, the electromagnetic two-way valve is closed.

[0084] In one embodiment, the apparatus further includes:

[0085] The enthalpy-increasing electronic expansion valve control module 1006 is used to adjust the opening degree of the enthalpy-increasing electronic expansion valve according to the exhaust temperature and the outlet water temperature if the solenoid two-way valve is closed.

[0086] In one embodiment, the enthalpy-increasing electronic expansion valve control module 1006 is further configured to detect the exhaust temperature and the outlet water temperature; if the exhaust temperature is lower than the unit's frequency reduction temperature, adjust the opening of the enthalpy-increasing electronic expansion valve according to the exhaust superheat; if the exhaust temperature is higher than the unit's frequency reduction temperature and the exhaust superheat is too large, increase the opening of the enthalpy-increasing electronic expansion valve.

[0087] In one embodiment, the enthalpy-increasing electronic expansion valve control module 1006 is further configured to: close the enthalpy-increasing electronic expansion valve if the exhaust temperature remains below the unit's frequency reduction temperature for 2 minutes and the exhaust superheat is ≤ the first temperature; decrease the enthalpy-increasing electronic expansion valve by 8 steps every 15 seconds if the exhaust temperature remains below the unit's frequency reduction temperature for 2 minutes and the first temperature < exhaust superheat ≤ the second temperature; and increase the enthalpy-increasing electronic expansion valve by 10 steps every 30 seconds if the exhaust temperature remains below the unit's frequency reduction temperature for 1 minute and the second temperature < exhaust superheat ≤ the third temperature.

[0088] In one embodiment, the enthalpy-increasing electronic expansion valve control module 1006 is further configured to, if the exhaust temperature is greater than the unit's frequency reduction temperature for 1 minute and the exhaust superheat is greater than the third temperature, increase the opening of the enthalpy-increasing electronic expansion valve by 20 steps, and then increase it by 8 steps every 15 seconds.

[0089] The various modules in the control device of the aforementioned heat pump unit can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of a computer device in hardware form or independent of it, or stored in the memory of a computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0090] In one embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0091] Determine whether the unit defrosting is complete;

[0092] Once the unit defrosts, the opening and closing of the solenoid two-way valve is controlled based on the exhaust superheat and the opening degree of the enthalpy-increasing electronic expansion valve.

[0093] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0094] Detect the exhaust superheat and the opening of the electronic expansion valve for enthalpy increase;

[0095] If the exhaust superheat is greater than the preset threshold and the opening of the enthalpy-increasing electronic expansion valve is 0, the solenoid two-way valve will be opened.

[0096] If the exhaust superheat exceeds the preset threshold and the opening of the enthalpy-increasing electronic expansion valve is not zero, close the solenoid two-way valve.

[0097] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0098] If the solenoid two-way valve is closed, adjust the opening of the enthalpy-increasing electronic expansion valve according to the exhaust temperature and the outlet water temperature.

[0099] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0100] Detect exhaust temperature and outlet water temperature;

[0101] If the exhaust temperature is lower than the unit's frequency reduction temperature, adjust the opening of the enthalpy-increasing electronic expansion valve according to the exhaust superheat.

[0102] If the exhaust temperature is higher than the unit's frequency reduction temperature and the exhaust superheat is too large, increase the opening of the enthalpy-increasing electronic expansion valve.

[0103] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0104] If the exhaust temperature remains below the unit's frequency reduction temperature for 2 minutes and the exhaust superheat is less than or equal to the first temperature, close the enthalpy-increasing electronic expansion valve.

[0105] If the exhaust temperature remains below the unit's frequency reduction temperature for 2 minutes, and the first temperature < exhaust superheat ≤ second temperature, the enthalpy-increasing electronic expansion valve will be reduced by 8 steps every 15 seconds.

[0106] If the exhaust temperature remains below the unit's frequency reduction temperature for 1 minute, and the second temperature < exhaust superheat ≤ third temperature, the enthalpy-increasing electronic expansion valve will be increased by 10 steps every 30 seconds.

[0107] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0108] If the exhaust temperature remains above the unit's frequency reduction temperature for 1 minute and the exhaust superheat is greater than the third temperature, the enthalpy-increasing electronic expansion valve will be opened by 20 steps, and then increased by 8 steps every 15 seconds thereafter.

[0109] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0110] Determine whether the unit defrosting is complete;

[0111] Once the unit defrosts, the opening and closing of the solenoid two-way valve is controlled based on the exhaust superheat and the opening degree of the enthalpy-increasing electronic expansion valve.

[0112] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0113] Detect the exhaust superheat and the opening of the electronic expansion valve for enthalpy increase;

[0114] If the exhaust superheat is greater than the preset threshold and the opening of the enthalpy-increasing electronic expansion valve is 0, the solenoid two-way valve will be opened.

[0115] If the exhaust superheat exceeds the preset threshold and the opening of the enthalpy-increasing electronic expansion valve is not zero, close the solenoid two-way valve.

[0116] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0117] If the solenoid two-way valve is closed, adjust the opening of the enthalpy-increasing electronic expansion valve according to the exhaust temperature and the outlet water temperature.

[0118] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0119] Detect exhaust temperature and outlet water temperature;

[0120] If the exhaust temperature is lower than the unit's frequency reduction temperature, adjust the opening of the enthalpy-increasing electronic expansion valve according to the exhaust superheat.

[0121] If the exhaust temperature is higher than the unit's frequency reduction temperature and the exhaust superheat is too large, increase the opening of the enthalpy-increasing electronic expansion valve.

[0122] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0123] If the exhaust temperature remains below the unit's frequency reduction temperature for 2 minutes and the exhaust superheat is less than or equal to the first temperature, close the enthalpy-increasing electronic expansion valve.

[0124] If the exhaust temperature remains below the unit's frequency reduction temperature for 2 minutes, and the first temperature < exhaust superheat ≤ second temperature, the enthalpy-increasing electronic expansion valve will be reduced by 8 steps every 15 seconds.

[0125] If the exhaust temperature remains below the unit's frequency reduction temperature for 1 minute, and the second temperature < exhaust superheat ≤ third temperature, the enthalpy-increasing electronic expansion valve will be increased by 10 steps every 30 seconds.

[0126] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0127] If the exhaust temperature remains above the unit's frequency reduction temperature for 1 minute and the exhaust superheat is greater than the third temperature, the enthalpy-increasing electronic expansion valve will be opened by 20 steps, and then increased by 8 steps every 15 seconds thereafter.

[0128] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps:

[0129] Determine whether the unit defrosting is complete;

[0130] Once the unit defrosts, the opening and closing of the solenoid two-way valve is controlled based on the exhaust superheat and the opening degree of the enthalpy-increasing electronic expansion valve.

[0131] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0132] Detect the exhaust superheat and the opening of the electronic expansion valve for enthalpy increase;

[0133] If the exhaust superheat is greater than the preset threshold and the opening of the enthalpy-increasing electronic expansion valve is 0, the solenoid two-way valve will be opened.

[0134] If the exhaust superheat exceeds the preset threshold and the opening of the enthalpy-increasing electronic expansion valve is not zero, close the solenoid two-way valve.

[0135] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0136] If the solenoid two-way valve is closed, adjust the opening of the enthalpy-increasing electronic expansion valve according to the exhaust temperature and the outlet water temperature.

[0137] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0138] Detect exhaust temperature and outlet water temperature;

[0139] If the exhaust temperature is lower than the unit's frequency reduction temperature, adjust the opening of the enthalpy-increasing electronic expansion valve according to the exhaust superheat.

[0140] If the exhaust temperature is higher than the unit's frequency reduction temperature and the exhaust superheat is too large, increase the opening of the enthalpy-increasing electronic expansion valve.

[0141] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0142] If the exhaust temperature remains below the unit's frequency reduction temperature for 2 minutes and the exhaust superheat is less than or equal to the first temperature, close the enthalpy-increasing electronic expansion valve.

[0143] If the exhaust temperature remains below the unit's frequency reduction temperature for 2 minutes, and the first temperature < exhaust superheat ≤ second temperature, the enthalpy-increasing electronic expansion valve will be reduced by 8 steps every 15 seconds.

[0144] If the exhaust temperature remains below the unit's frequency reduction temperature for 1 minute, and the second temperature < exhaust superheat ≤ third temperature, the enthalpy-increasing electronic expansion valve will be increased by 10 steps every 30 seconds.

[0145] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0146] If the exhaust temperature remains above the unit's frequency reduction temperature for 1 minute and the exhaust superheat is greater than the third temperature, the enthalpy-increasing electronic expansion valve will be opened by 20 steps, and then increased by 8 steps every 15 seconds thereafter.

[0147] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0148] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0149] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A control method for a heat pump unit, characterized in that, The heat pump unit includes a plate heat exchanger, a first three-way connector, a second three-way connector, an enthalpy-increasing electronic expansion valve, a solenoid two-way valve, a third three-way connector, and a compressor. The inlet of the first three-way connector is connected to the lower outlet of the plate heat exchanger; the inlet of the second three-way connector is connected to the first outlet of the first three-way connector; the enthalpy-increasing electronic expansion valve is connected to the first outlet of the second three-way connector; the solenoid two-way valve is connected to the second outlet of the second three-way connector; the first inlet of the third three-way connector is connected to the solenoid two-way valve; the second inlet of the third three-way connector is connected to the upper outlet of the plate heat exchanger; and the compressor's gas inlet is connected to the outlet of the third three-way connector. The method includes: Determine whether the unit defrosting is complete; If the unit defrosting is completed, the opening and closing of the solenoid two-way valve is controlled according to the exhaust superheat and the opening degree of the enthalpy-increasing electronic expansion valve. The method of controlling the opening and closing of the solenoid two-way valve based on the exhaust superheat and the opening degree of the enthalpy-increasing electronic expansion valve includes: Detect the exhaust superheat and the opening degree of the enthalpy-increasing electronic expansion valve; If the exhaust superheat is greater than a preset threshold and the opening of the enthalpy-increasing electronic expansion valve is 0, the electromagnetic two-way valve is opened. If the exhaust superheat is greater than the preset threshold and the opening of the enthalpy-increasing electronic expansion valve is not 0, the electromagnetic two-way valve is closed.

2. The method according to claim 1, characterized in that, The method further includes: If the electromagnetic two-way valve is closed, the opening of the enthalpy-increasing electronic expansion valve is adjusted according to the exhaust temperature and the outlet water temperature.

3. The method according to claim 2, characterized in that, The adjustment of the opening degree of the enthalpy-increasing electronic expansion valve based on the exhaust temperature and the outlet water temperature includes: Detect exhaust temperature and outlet water temperature; If the exhaust temperature is lower than the unit's frequency reduction temperature, adjust the opening of the enthalpy-increasing electronic expansion valve according to the exhaust superheat. If the exhaust temperature is greater than the unit's frequency reduction temperature and the exhaust superheat is too large, increase the opening of the enthalpy-increasing electronic expansion valve.

4. The method according to claim 3, characterized in that, If the exhaust temperature is lower than the unit's frequency reduction temperature, adjusting the opening of the enthalpy-increasing electronic expansion valve according to the exhaust superheat includes: If the exhaust temperature remains below the unit's frequency reduction temperature for 2 minutes and the exhaust superheat is less than or equal to the first temperature, the enthalpy-increasing electronic expansion valve shall be closed. If the exhaust temperature remains below the unit's frequency reduction temperature for 2 minutes, and the first temperature < exhaust superheat ≤ second temperature, the enthalpy-increasing electronic expansion valve will be reduced by 8 steps every 15 seconds. If the exhaust temperature remains below the unit's frequency reduction temperature for 1 minute, and the second temperature < exhaust superheat ≤ third temperature, the enthalpy-increasing electronic expansion valve will be increased by 10 steps every 30 seconds.

5. The method according to claim 3, characterized in that, If the exhaust temperature is greater than the unit's frequency reduction temperature and the exhaust superheat is excessive, the opening of the enthalpy-increasing electronic expansion valve is increased, including: If the exhaust temperature remains higher than the unit's frequency reduction temperature for 1 minute, and the exhaust superheat is greater than the third temperature, the enthalpy-increasing electronic expansion valve will be opened by 20 steps, and then increased by 8 steps every 15 seconds.

6. A control device for a heat pump unit used to execute the control method of the heat pump unit as described in claim 1, characterized in that, The heat pump unit includes a plate heat exchanger, a first three-way connector, a second three-way connector, an enthalpy-increasing electronic expansion valve, a solenoid two-way valve, a third three-way connector, and a compressor. The inlet of the first three-way connector is connected to the lower outlet of the plate heat exchanger; the inlet of the second three-way connector is connected to the first outlet of the first three-way connector; the enthalpy-increasing electronic expansion valve is connected to the first outlet of the second three-way connector; the solenoid two-way valve is connected to the second outlet of the second three-way connector; the first inlet of the third three-way connector is connected to the solenoid two-way valve; the second inlet of the third three-way connector is connected to the upper outlet of the plate heat exchanger; and the compressor is connected to the outlet of the third three-way connector. The device includes: The defrosting judgment module is used to determine whether the unit defrosting has ended; The electromagnetic two-way valve control module is used to control the opening and closing of the electromagnetic two-way valve based on the exhaust superheat and the opening degree of the enthalpy-increasing electronic expansion valve when the unit defrosting is completed.

7. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 5.

9. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 5.

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