A method, device, controller, and heat pump unit for adjusting the opening degree of an electronic expansion valve.

Abstract

This invention relates to a method, device, controller, and heat pump unit for adjusting the opening degree of an electronic expansion valve. The method for adjusting the opening degree of the electronic expansion valve according to this invention includes the following steps: S1: After the heat pump unit is running stably, obtain the initial output capacity Q1 of the heat pump unit; S2: Obtain the adjustment direction and adjustment amount of the electronic expansion valve, and adjust the opening degree of the electronic expansion valve according to the adjustment direction and adjustment amount; S3: After the heat pump unit is running stably, obtain the real-time output capacity Q2 of the heat pump unit; S4: Compare the change in the output capacity of the heat pump unit before and after adjustment. If the output capacity after adjustment is greater than the output capacity before adjustment, repeat steps S2-S3 until the output capacity after adjustment is no greater than the output capacity before adjustment. The electronic expansion valve opening degree adjustment method of this invention can narrow the output range of the heat pump unit during stable operation, further achieving the optimal output capacity of the heat pump unit.

Description

Technical Field

[0001] This invention relates to the field of heat pump system technology, and in particular to an electronic expansion valve opening adjustment method, device, controller, and heat pump host. Background Technology

[0002] Heat pump systems have become an indispensable part of modern life, with ever-increasing demand in essential public services such as cooling, heating, and domestic hot water supply. However, in traditional heat pump systems, given the availability of key components, the output capacity of the heat pump unit is within a defined range, almost entirely determined by the refrigerant circulation flow rate. This flow rate is controlled by an electronic expansion valve within the unit, and conventional control methods can only cause the heat pump unit to fluctuate within a certain output range, failing to achieve its optimal output capacity. Summary of the Invention

[0003] Based on this, the purpose of the present invention is to provide an electronic expansion valve opening adjustment method, device, controller and heat pump host, which can narrow the output range of the heat pump unit during stable operation and further achieve the optimal output capacity of the heat pump unit.

[0004] According to a first aspect of some embodiments of this application, an electronic expansion valve opening adjustment method is provided, comprising the following steps:

[0005] S1: After the heat pump unit is running stably, obtain the initial output capacity Q1 of the heat pump unit;

[0006] S2: Obtain the adjustment direction and adjustment amount of the electronic expansion valve, and adjust the opening degree of the electronic expansion valve according to the adjustment direction and the adjustment amount;

[0007] S3: After the heat pump unit is running stably, obtain the real-time output capacity Q2 of the heat pump unit;

[0008] S4: Compare the changes in the output capacity of the heat pump unit before and after adjustment. If the output capacity after adjustment is greater than the output capacity before adjustment, repeat steps S2-S3 until the output capacity after adjustment is no greater than the output capacity before adjustment.

[0009] Furthermore, in step S4, after repeating steps S2-S3, if the adjusted output capacity is less than the output capacity before adjustment, the electronic expansion valve is controlled to operate at the opening degree before the adjustment.

[0010] Further, in step S4, the change in the output capacity of the heat pump unit before and after adjustment is compared. If the output capacity after adjustment is less than the output capacity before adjustment, the following steps are also included:

[0011] S6: Adjust the opening value of the electronic expansion valve in the opposite direction of the adjustment direction and by the adjustment amount;

[0012] S7: After the heat pump unit is running stably, obtain the real-time output capacity Q3 of the heat pump unit;

[0013] S8: Compare the changes in the output capacity of the heat pump unit before and after adjustment. If the output capacity after adjustment is greater than the output capacity before adjustment, repeat steps S6-S7 until the output capacity after adjustment is no greater than the output capacity before adjustment.

[0014] Furthermore, in step S8, after repeating steps S6-S7, if the adjusted output capacity is less than the output capacity before adjustment, the electronic expansion valve is controlled to operate at the opening degree before the adjustment.

[0015] Further, in step S2, obtaining the adjustment direction of the electronic expansion valve includes:

[0016] Obtain the exhaust temperature and outlet water temperature of the heat pump unit;

[0017] Calculate the difference between the exhaust temperature and the outlet water temperature;

[0018] When the difference is greater than a set threshold, the adjustment direction is the direction in which the opening of the electronic expansion valve increases;

[0019] When the difference is less than a set threshold, the adjustment direction is the direction in which the opening of the electronic expansion valve decreases.

[0020] Furthermore, the output capacity Q of the heat pump unit is calculated based on the following formula:

[0021] Q = L * (T1 - T2) * f

[0022] Where L is the real-time water flow rate of the heat pump unit, T1 is the inlet water temperature of the heat pump unit, T2 is the outlet water temperature of the heat pump unit, and f is the adjustment coefficient;

[0023] The adjustment coefficient f is 1.1 to 1.2.

[0024] Furthermore, the operating parameters of the heat pump unit are obtained, and when the operating parameters are stable, it is determined that the heat pump unit is operating stably.

[0025] The operating parameters include at least one of the following:

[0026] The operating frequency, fan speed, and electronic expansion valve opening of the heat pump unit.

[0027] According to a second aspect of some embodiments of this application, an electronic expansion valve opening adjustment device is provided, comprising:

[0028] The initial capacity acquisition module is used to acquire the initial output capacity Q1 of the heat pump unit after the heat pump unit has been running stably.

[0029] The adjustment opening determination module obtains the adjustment direction and adjustment amount of the electronic expansion valve, and adjusts the opening of the electronic expansion valve according to the adjustment direction and the adjustment amount;

[0030] The real-time capability acquisition module is used to acquire the real-time output capability Q2 of the heat pump unit after the heat pump unit is running stably.

[0031] The capacity change comparison module is used to compare the change in output capacity of the heat pump unit before and after adjustment. If the output capacity after adjustment is greater than the output capacity before adjustment, the adjustment steps of the adjustment opening determination module and the real-time capacity acquisition module are repeated until the output capacity after adjustment is no greater than the output capacity before adjustment.

[0032] According to a third aspect of some embodiments of this application, a controller is provided, comprising:

[0033] At least one memory and at least one processor;

[0034] The memory is used to store one or more programs;

[0035] When the one or more programs are executed by the at least one processor, the at least one processor performs the steps of a control method for a heat pump unit as described in any of the first aspects.

[0036] According to a fourth aspect of some embodiments of this application, a heat pump host is provided, including a controller as described in the third aspect above.

[0037] This application provides a method, device, controller, and heat pump unit for adjusting the opening of an electronic expansion valve. After the heat pump system has been running stably, the electronic expansion valve is precisely adjusted, and the changes in output capacity before and after adjustment are compared. This adjustment is repeated until the optimal output capacity of the heat pump unit is obtained and maintained stably. This application also preliminarily determines the adjustment direction of the heat pump unit by comparing the difference between the exhaust temperature and the outlet water temperature, enabling the optimal output capacity of the heat pump unit to be obtained quickly and maintained stably. Furthermore, the method of this application automatically readjusts the opening to adapt to changes in the operating parameters and external conditions of the heat pump unit, providing flexibility.

[0038] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0039] Figure 1 This is a schematic diagram illustrating the steps of an electronic expansion valve opening adjustment method according to an embodiment of the present invention;

[0040] Figure 2 This is a flowchart illustrating an electronic expansion valve opening adjustment method according to an embodiment of the present invention.

[0041] Figure 3 This is a flowchart illustrating an electronic expansion valve opening adjustment method according to an embodiment of the present invention.

[0042] Figure 4 This is a schematic diagram of an electronic expansion valve opening adjustment device according to an embodiment of the present invention;

[0043] Figure 5 This is a schematic diagram of the structure of a heat pump host in an embodiment of the present invention.

[0044] Figure label:

[0045] 1. Compressor; 2. Plate heat exchanger; 3. Electronic expansion valve; 4. Finned heat exchanger; 5. Four-way reversing valve; 6. Outlet water temperature sensor; 7. Inlet water temperature sensor; 8. Water flow meter; 9. Exhaust temperature sensor. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0047] It should be understood that the described embodiments are merely some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of the embodiments of this application.

[0048] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0049] In the following description, when referring to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims. In the description of this application, it should be understood that the terms "first," "second," "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0050] Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0051] Regarding the technical problems mentioned in the background, conventional control methods generally involve fixed-point opening control or control based on exhaust superheat or return superheat. However, these are only relatively crude control methods. In contrast, the electronic expansion valve opening adjustment method provided in this application can achieve precise adjustment of the electronic expansion valve opening, enabling the heat pump unit to reach its optimal output capacity and maintain stable output.

[0052] The electronic expansion valve opening adjustment method provided in this application embodiment can be executed by an electronic expansion valve opening adjustment device in a heat pump unit. The electronic expansion valve opening adjustment device can be the controller of the heat pump unit, and the electronic expansion valve can be an electromagnetic electronic expansion valve or an electric electronic expansion valve.

[0053] like Figure 1 As shown, Figure 1 This application provides a schematic diagram of the steps for adjusting the opening of an electronic expansion valve, which includes the following steps:

[0054] S1: After the heat pump unit is running stably, obtain the initial output capacity Q1 of the heat pump unit.

[0055] Stable operation of the heat pump unit refers to the fact that the operating parameters of all operating components in the heat pump unit have reached a stable operating state. For example, the operating frequency of the heat pump unit is fixed, the fan speed is stable, and the opening degree of the electronic expansion valve is determined. When one or more of the operating parameters are found to meet the requirements, the heat pump unit can be considered to be operating stably. At this time, the output capacity can also be considered to be a stable value. The initial output capacity Q1 of the heat pump unit is obtained, and the heat pump unit needs to reach a stable operating state each time the output capacity of the heat pump unit is obtained.

[0056] Specifically, before step S1, ensuring the stable operation of the heat pump unit also includes:

[0057] The operating parameters of the heat pump unit are obtained, and when the operating parameters are stable, it is determined that the heat pump unit is operating stably.

[0058] S2: Obtain the adjustment direction and adjustment amount of the electronic expansion valve, and adjust the opening degree of the electronic expansion valve according to the adjustment direction and the adjustment amount.

[0059] The adjustment direction of the electronic expansion valve refers to the direction in which the opening of the electronic expansion valve is increased or decreased, thereby changing the refrigerant flow rate in the refrigerant pipeline. When the adjustment direction is to increase the opening of the electronic expansion valve, the refrigerant flow rate in the refrigerant pipeline increases accordingly; when the adjustment direction is to decrease the opening of the electronic expansion valve, the refrigerant flow rate in the refrigerant pipeline decreases accordingly.

[0060] The adjustment amount is the change in the opening of the electronic expansion valve after adjustment compared to the opening of the electronic expansion valve before adjustment. The electronic expansion valve is adjusted in the adjustment direction based on this change value. In the embodiments of this application, the adjustment amount is a preset fixed value, and the same adjustment amount is executed for each adjustment.

[0061] Optionally, when the electronic expansion valve is an electric electronic expansion valve, the electric electronic expansion valve changes the valve body opening according to the number of steps controlled by the stepper motor. Therefore, the opening of the electronic expansion valve can be finely adjusted in N steps, where N is a positive constant. When the electronic expansion valve is an electromagnetic electronic expansion valve, the electromagnetic electronic expansion valve changes the valve body opening according to the received control signal. Therefore, the opening of the valve body can be changed by changing the voltage or current applied to the electromagnetic coil in the electronic expansion valve, which causes the electromagnetic force on the plunger made of magnetic material to change.

[0062] In other examples, the adjustment amount can also be a variable, such as a change value set according to the opening of the electronic expansion valve, or an adjustment amount that increases when the output capacity changes significantly and decreases when the change is small, or an adjustment amount that decreases as the number of adjustments increases, thereby reducing the adjustment range of the electronic expansion valve and making the output capacity of the heat pump unit closer to the optimal output capacity.

[0063] S3: After the heat pump unit is running stably, obtain the real-time output capacity Q2 of the heat pump unit;

[0064] S4: Compare the changes in the output capacity of the heat pump unit before and after adjustment. If the output capacity after adjustment is greater than the output capacity before adjustment, repeat steps S2-S3 until the output capacity after adjustment is no greater than the output capacity before adjustment.

[0065] In this application, when the heat pump unit reaches a stable state, the electronic expansion valve is controlled to adjust its opening according to the initially determined adjustment direction and the determined adjustment amount. When the heat pump unit reaches a stable state again after adjustment, the initial output capacity Q1 and the real-time output capacity Q2 are compared. If the real-time output capacity Q2 after adjustment is greater than the initial output capacity Q1 before adjustment, it is determined that the heat pump unit has not reached the optimal output capacity, and adjusting the opening of the electronic expansion valve in the adjustment direction will enable the heat pump unit to achieve better output.

[0066] Based on this, repeat steps S2-S3 to achieve the same-direction adjustment of the electronic expansion valve until the output capacity after adjustment is not greater than the output capacity before adjustment. That is, the output capacity after adjustment is less than or equal to the output capacity before adjustment. It is understandable that continuing to perform the same-direction adjustment will lead to a decrease in the output capacity of the heat pump unit. Therefore, it is necessary to stop performing the same-direction adjustment of the electronic expansion valve.

[0067] In one example, when performing the above-mentioned unidirectional adjustment of the electronic expansion valve until the adjusted output capacity is no greater than the unadjusted output capacity, the process also includes:

[0068] In step S4, after repeating steps S2-S3, if the adjusted output capacity is less than the original output capacity, the electronic expansion valve is controlled to operate at the original opening degree.

[0069] In this embodiment, when the adjusted output capacity equals the original output capacity, since the adjustment amount is a fixed value, and other conditions remain unchanged, it can be assumed that the output capacities corresponding to the two opening degrees of the electronic expansion valve are consistent, and no further adjustment of the electronic expansion valve is required. However, when the adjusted output capacity is less than the original output capacity, the electronic expansion valve is controlled to operate at the original opening degree. That is, the opening degree of the electronic expansion valve is adjusted by an adjustment amount in the opposite direction of the adjustment direction, and the opening degree of the electronic expansion valve is locked, so that the heat pump unit operates with a better output capacity and maintains stable output.

[0070] In one example, when the initial adjustment direction of the heat pump unit causes the real-time output capacity Q2 to be less than the initial output capacity Q1, that is, in step S4, the change in the output capacity of the heat pump unit before and after adjustment is compared. If the output capacity after adjustment is less than the output capacity before adjustment, the following steps are also included:

[0071] S6: Adjust the opening value of the electronic expansion valve in the opposite direction of the adjustment direction and by the adjustment amount;

[0072] S7: After the heat pump unit is running stably, obtain the real-time output capacity Q3 of the heat pump unit;

[0073] S8: Compare the changes in the output capacity of the heat pump unit before and after adjustment. If the output capacity after adjustment is greater than the output capacity before adjustment, repeat steps S6-S7 until the output capacity after adjustment is no greater than the output capacity before adjustment.

[0074] In the case where the initial adjustment direction of the heat pump unit causes the real-time output capacity Q2 to be less than the initial output capacity Q1, it can be concluded that the initially determined adjustment direction is the direction that leads to the deterioration of the heat pump output capacity. Only by adjusting in the opposite direction can the heat pump output capacity be improved.

[0075] In one example, when performing the reverse adjustment of the electronic expansion valve as described above until the adjusted output capacity is no greater than the original output capacity, the process also includes:

[0076] In step S8, after repeating steps S6-S7, if the adjusted output capacity is less than the original output capacity, the electronic expansion valve is controlled to operate at the original opening degree.

[0077] In one example, in step S2, obtaining the adjustment direction of the electronic expansion valve includes:

[0078] Obtain the exhaust temperature and outlet water temperature of the heat pump unit;

[0079] Calculate the difference between the exhaust temperature and the outlet water temperature;

[0080] When the difference is greater than a set threshold, the adjustment direction is the direction in which the opening of the electronic expansion valve increases;

[0081] When the difference is less than a set threshold, the adjustment direction is the direction in which the opening of the electronic expansion valve decreases.

[0082] The exhaust temperature of the heat pump unit refers to the exhaust temperature of the compressor, and the outlet water temperature refers to the outlet water temperature of the plate heat exchanger. By detecting the difference between the exhaust temperature and the outlet water temperature, the adjustment direction of the electronic expansion valve is initially determined. When the difference is greater than the set threshold, the initial adjustment direction is the direction in which the opening of the electronic expansion valve increases; when the difference is less than the set threshold, the initial adjustment direction is the direction in which the opening of the electronic expansion valve decreases.

[0083] After determining the adjustment direction of the electronic expansion valve, the adjustment method in steps S1-S4 is executed. When the real-time output capacity Q2 is greater than the initial output capacity Q1, the adjustment direction is preliminarily judged to be correct and is the adjustment direction that can optimize the output capacity of the heat pump unit. When the real-time output capacity Q2 is less than the initial output capacity Q1, the adjustment direction is preliminarily judged to be incorrect and is the adjustment direction that can deteriorate the output capacity of the heat pump unit. The adjustment method in steps S6-S8 needs to be executed to adjust the adjustment direction in the opposite direction.

[0084] In a specific example, the output capacity Q of the heat pump unit is calculated based on the following formula:

[0085] Q = L * (T1 - T2) * f

[0086] Wherein, L is the real-time water flow rate of the heat pump unit, T1 is the inlet water temperature of the heat pump unit, T2 is the outlet water temperature of the heat pump unit, and f is the adjustment coefficient; the adjustment coefficient f is 1.1 to 1.2.

[0087] Furthermore, even after the heat pump unit has completed the adjustment and locking of the electronic expansion valve opening, and is operating stably at that opening, the performance of the heat pump system will still change when external conditions alter. Therefore, it is necessary to release the electronic expansion valve lock and, after the heat pump unit stabilizes again, restart the electronic expansion valve adjustment process to re-determine the opening of the electronic expansion valve to adapt to the current external conditions. External conditions can include ambient temperature, which can be directly determined by detecting the ambient temperature, or indirectly determined by detecting the heat pump unit's operating parameters, such as the operating frequency, fan speed, electronic expansion valve opening, and inlet / outlet water temperatures.

[0088] In a specific application scenario, such as Figure 1 and 2 As shown, the electronic expansion valve opening adjustment method provided in this application involves obtaining the initial output capacity Q1 of the heat pump unit after confirming that the heat pump unit has entered a stable state; then, the adjustment direction is initially determined by the exhaust temperature and outlet water temperature; after determining the adjustment direction, the opening of the electronic expansion valve is adjusted based on the adjustment amount N; after the heat pump unit is running stably, the real-time output capacity Q2 of the heat pump unit is obtained, and the change in the output capacity of the heat pump unit before and after adjustment is compared.

[0089] When Q2 is greater than Q1, the initial adjustment direction is determined to increase the output capacity of the heat pump unit. This adjustment continues in the same direction, based on the adjustment amount N, until the output capacity after adjustment is no greater than the output capacity before adjustment. The electronic expansion valve is then controlled to operate at its original opening degree before adjustment; that is, the opening of the electronic expansion valve is adjusted based on the opposite direction of adjustment and an adjustment amount N. At this point, the heat pump unit reaches its optimal output capacity, and both increasing and decreasing the opening of the electronic expansion valve will decrease the output capacity of the heat pump unit.

[0090] like Figure 3 As shown, when Q2 is less than Q1, the initial adjustment direction is determined to be the direction that reduces the output capacity of the heat pump unit. Then, the opening of the electronic expansion valve is adjusted based on the opposite direction of the adjustment and the adjustment amount N. When the heat pump unit is running stably, the real-time output capacity Q3 of the heat pump unit is obtained, and the reverse adjustment based on the adjustment amount N is continued until the output capacity after adjustment is not greater than the output capacity before adjustment. At this time, the electronic expansion valve is controlled to run at the opening before the adjustment. At this time, the heat pump unit reaches the optimal output capacity. The direction of increasing and decreasing the opening of the electronic expansion valve is the direction that reduces the output capacity of the heat pump unit.

[0091] Corresponding to the above-described method for adjusting the opening of an electronic expansion valve, this application also provides an electronic expansion valve opening adjustment device, such as... Figure 4 As shown, Figure 4 This is a schematic diagram of an electronic expansion valve opening adjustment device provided by the present invention. The device 400 includes:

[0092] The initial capacity acquisition module 401 is used to acquire the initial output capacity Q1 of the heat pump unit after the heat pump unit has been running stably.

[0093] The adjustment opening determination module 402 obtains the adjustment direction and adjustment amount of the electronic expansion valve, and adjusts the opening of the electronic expansion valve according to the adjustment direction and the adjustment amount.

[0094] The real-time capability acquisition module 403 is used to acquire the real-time output capability Q2 of the heat pump unit after the heat pump unit has been running stably.

[0095] The capacity change comparison module 404 is used to compare the output capacity change of the heat pump unit before and after adjustment. If the output capacity after adjustment is greater than the output capacity before adjustment, the adjustment steps of the adjustment opening determination module and the real-time capacity acquisition module are repeated until the output capacity after adjustment is not greater than the output capacity before adjustment.

[0096] In an optional embodiment, the capability change comparison module 404 of the device further includes:

[0097] The control unit is used to repeatedly execute the adjustment steps of the adjustment opening determination module and the real-time capability acquisition module. If the adjusted output capability is less than the output capability before adjustment, the electronic expansion valve is controlled to operate at the opening before adjustment.

[0098] In an optional embodiment, the capability change comparison module 404 of the device further includes:

[0099] A reverse adjustment unit is used to adjust the opening value of the electronic expansion valve in the opposite direction of the adjustment direction and by the adjustment amount.

[0100] The real-time capability acquisition unit is used to acquire the real-time output capability Q3 of the heat pump unit after the heat pump unit has been running stably.

[0101] The second capacity comparison unit is used to compare the change in output capacity of the heat pump unit before and after adjustment. If the output capacity after adjustment is greater than the output capacity before adjustment, the adjustment steps of the reverse adjustment unit and the real-time capacity acquisition unit are repeated until the output capacity after adjustment is not greater than the output capacity before adjustment.

[0102] In an optional embodiment, the capability change comparison module 404 of the device further includes:

[0103] The second control unit is used to repeatedly execute the adjustment steps of the reverse adjustment unit and the real-time capability acquisition unit. If the adjusted output capability is less than the output capability before adjustment, the electronic expansion valve is controlled to operate at the opening degree before the adjustment.

[0104] In an optional embodiment, the adjustment opening determination module 402 of the device further includes:

[0105] A temperature acquisition unit is used to acquire the exhaust temperature and outlet water temperature of the heat pump unit.

[0106] The difference calculation unit is used to calculate the difference between the exhaust temperature and the outlet water temperature;

[0107] An adjustment direction confirmation unit is configured to, when the difference is greater than a set threshold, determine the adjustment direction as the direction in which the opening of the electronic expansion valve increases; and...

[0108] When the difference is less than a set threshold, the adjustment direction is the direction in which the opening of the electronic expansion valve decreases.

[0109] In an optional embodiment, the device 400 further includes:

[0110] The output capacity calculation module calculates the output capacity Q of the heat pump unit based on the following formula:

[0111] Q = L * (T1 - T2) * f

[0112] Where L is the real-time water flow rate of the heat pump unit, T1 is the inlet water temperature of the heat pump unit, T2 is the outlet water temperature of the heat pump unit, and f is the adjustment coefficient;

[0113] The adjustment coefficient f is 1.1 to 1.2.

[0114] In an optional embodiment, the device 400 further includes:

[0115] The operating parameter acquisition module is used to acquire the operating parameters of the heat pump unit, and determine that the heat pump unit is operating stably when the operating parameters are stable.

[0116] The operating parameters include at least one of the following:

[0117] The operating frequency, fan speed, and electronic expansion valve opening of the heat pump unit.

[0118] For the apparatus embodiments, since they basically correspond to the method embodiments, the relevant parts can be referred to in the description of the method embodiments. The apparatus embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, apparatuses, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0119] Corresponding to the above-described method for adjusting the opening of an electronic expansion valve, this application also provides a controller for adjusting the opening of an electronic expansion valve, comprising:

[0120] At least one memory and at least one processor;

[0121] The memory is used to store one or more programs;

[0122] When the one or more programs are executed by the at least one processor, the at least one processor performs the steps of an electronic expansion valve opening adjustment method as described in any of the above embodiments.

[0123] Corresponding to the above-described method for adjusting the opening of an electronic expansion valve, this application also provides a heat pump host, which includes a controller as described in the above embodiments.

[0124] Specifically, such as Figure 5 As shown, the heat pump unit also includes a compressor 1, a plate heat exchanger 2, an electronic expansion valve 3, and a finned heat exchanger 4 connected in sequence through refrigerant pipelines. A four-way reversing valve 5 is installed between the compressor 1 and the plate heat exchanger 2 and the finned heat exchanger 4, so that the flow direction of the refrigerant in the pipeline can be changed by changing the connection direction of the four-way reversing valve 5, thereby realizing the switching between cooling, dehumidification and heating modes of the heat pump unit.

[0125] The heat pump unit also includes an outlet water temperature sensor 6, an inlet water temperature sensor 7, a water flow meter 8, an exhaust temperature sensor 9, and an ambient temperature sensor. The outlet water temperature sensor 6 and the water flow meter 8 are installed on the outlet water pipe of the plate heat exchanger to detect the real-time outlet water temperature and the real-time water flow rate, respectively. The inlet water temperature sensor 7 is installed on the inlet water pipe of the plate heat exchanger to detect the real-time inlet water temperature. The exhaust temperature sensor 9 is installed on the exhaust pipe between the compressor 1 and the four-way reversing valve 5 to detect the exhaust temperature of the compressor 1.

[0126] In one example, the controller of the heat pump unit receives a start-up signal and controls the compressor to start working. This drives the refrigerant to operate within a closed-loop system formed by the compressor, plate heat exchanger, electronic expansion valve, and finned heat exchanger in the condenser piping, achieving heat pump cooling or heating. During the cooling or heating process of the heat pump unit, real-time outlet and inlet water temperatures are detected by outlet and inlet water temperature sensors, real-time water flow is detected by a water flow meter, the compressor exhaust temperature is detected by an exhaust temperature sensor, and the ambient temperature during heat pump unit operation is detected by an ambient temperature sensor. By acquiring the above data, as well as operating parameters such as the heat pump unit's operating frequency, fan speed, and electronic expansion valve opening, the controller determines whether the heat pump unit is in a stable state or whether external conditions have changed, and executes the steps of the electronic expansion valve opening adjustment method described in any of the above embodiments.

[0127] This application provides a method, device, controller, and heat pump unit for adjusting the opening of an electronic expansion valve. After the heat pump system has been running stably, the electronic expansion valve is precisely adjusted, and the changes in output capacity before and after adjustment are compared. This adjustment is repeated until the optimal output capacity of the heat pump unit is obtained and maintained stably. This application also preliminarily determines the adjustment direction of the heat pump unit by comparing the difference between the exhaust temperature and the outlet water temperature, enabling the optimal output capacity of the heat pump unit to be obtained quickly and maintained stably. Furthermore, the method of this application automatically readjusts the opening to adapt to changes in the operating parameters and external conditions of the heat pump unit, providing flexibility.

[0128] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A method for adjusting the opening degree of an electronic expansion valve, characterized in that, Includes the following steps: S1: After the heat pump unit is running stably, obtain the initial output capacity Q1 of the heat pump unit; S2: Obtain the adjustment direction and adjustment amount of the electronic expansion valve, and adjust the opening degree of the electronic expansion valve according to the adjustment direction and the adjustment amount; The method of obtaining the adjustment direction of the electronic expansion valve includes: Obtain the exhaust temperature and outlet water temperature of the heat pump unit; Calculate the difference between the exhaust temperature and the outlet water temperature; When the difference is greater than a set threshold, the adjustment direction is the direction in which the opening of the electronic expansion valve increases; When the difference is less than a set threshold, the adjustment direction is the direction in which the opening of the electronic expansion valve decreases; S3: After the heat pump unit is running stably, obtain the real-time output capacity Q2 of the heat pump unit; S4: Compare the changes in the output capacity of the heat pump unit before and after adjustment: If the adjusted output capability is greater than the original output capability, repeat steps S2-S3 until the adjusted output capability is no greater than the original output capability. If the adjusted output capability is less than the original output capability, the following steps are also included: S6: Adjust the opening value of the electronic expansion valve in the opposite direction of the adjustment direction and by the adjustment amount; S7: After the heat pump unit is running stably, obtain the real-time output capacity Q3 of the heat pump unit; S8: Compare the changes in the output capacity of the heat pump unit before and after adjustment. If the output capacity after adjustment is greater than the output capacity before adjustment, repeat steps S6-S7 until the output capacity after adjustment is not greater than the output capacity before adjustment. The output capacity Q of the heat pump unit is calculated based on the following formula: Q = L * (T1 - T2) * f Where L is the real-time water flow rate of the heat pump unit, T1 is the inlet water temperature of the heat pump unit, T2 is the outlet water temperature of the heat pump unit, and f is the adjustment coefficient; The adjustment coefficient f is 1.1 to 1.

2.

2. The method for adjusting the opening degree of an electronic expansion valve according to claim 1, characterized in that: In step S4, after repeating steps S2-S3, if the adjusted output capacity is less than the original output capacity, the electronic expansion valve is controlled to operate at the original opening degree.

3. The method for adjusting the opening degree of an electronic expansion valve according to claim 1, characterized in that: In step S8, after repeating steps S6-S7, if the adjusted output capacity is less than the original output capacity, the electronic expansion valve is controlled to operate at the original opening degree.

4. The method for adjusting the opening degree of an electronic expansion valve according to claim 1, characterized in that, Before step S1, the following is also included: The operating parameters of the heat pump unit are obtained, and when the operating parameters are stable, it is determined that the heat pump unit is operating stably. The operating parameters include at least one of the following: The operating frequency, fan speed, and electronic expansion valve opening of the heat pump unit.

5. An electronic expansion valve opening adjustment device, characterized in that, include: The initial capacity acquisition module is used to acquire the initial output capacity Q1 of the heat pump unit after the heat pump unit has been running stably. The adjustment opening determination module obtains the adjustment direction and adjustment amount of the electronic expansion valve, and adjusts the opening of the electronic expansion valve according to the adjustment direction and the adjustment amount; The method of obtaining the adjustment direction of the electronic expansion valve includes: Obtain the exhaust temperature and outlet water temperature of the heat pump unit; Calculate the difference between the exhaust temperature and the outlet water temperature; When the difference is greater than a set threshold, the adjustment direction is the direction in which the opening of the electronic expansion valve increases; When the difference is less than a set threshold, the adjustment direction is the direction in which the opening of the electronic expansion valve decreases; The real-time capability acquisition module is used to acquire the real-time output capability Q2 of the heat pump unit after the heat pump unit is running stably. The capacity change comparison module is used to compare the output capacity change of the heat pump unit before and after adjustment: if the output capacity after adjustment is greater than the output capacity before adjustment, the adjustment steps of the adjustment opening determination module and the real-time capacity acquisition module are repeated until the output capacity after adjustment is not greater than the output capacity before adjustment; if the output capacity after adjustment is less than the output capacity before adjustment, the adjustment steps of the adjustment opening determination module and the real-time capacity acquisition module are repeated in the opposite direction of the adjustment direction and with the adjustment amount until the output capacity after adjustment is not greater than the output capacity before adjustment. The output capacity Q of the heat pump unit is calculated based on the following formula: Q = L * (T1 - T2) * f Where L is the real-time water flow rate of the heat pump unit, T1 is the inlet water temperature of the heat pump unit, T2 is the outlet water temperature of the heat pump unit, and f is the adjustment coefficient; The adjustment coefficient f is 1.1 to 1.

2.

6. A controller, characterized in that, include: At least one memory and at least one processor; The memory is used to store one or more programs; When the one or more programs are executed by the at least one processor, the at least one processor implements the steps of the control method for a heat pump unit as described in any one of claims 1 to 4.

7. A heat pump main unit, characterized in that: Includes a controller as described in claim 6.

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