Control method of compressor preheating, electronic device and heat pump unit

Abstract

This application relates to the field of heat pump unit technology, specifically providing a control method, electronic equipment, and heat pump unit for compressor preheating. It aims to solve the problems of high cost, difficult installation, limited heating efficiency, significant heat loss, and uneven heating associated with related technologies that use heating belts to preheat compressors. To this end, the control method of this application includes: when the compressor is in a stopped state, acquiring the outdoor ambient temperature and compressor status parameters; if the outdoor ambient temperature is less than or equal to a first preset ambient temperature, and the compressor status parameters meet preset preheating conditions, controlling the heating of the compressor windings; and adjusting the heating power of the windings according to the compressor status parameters and the outdoor ambient temperature. This application uses the compressor's own windings for auxiliary heating, enabling uniform preheating of the entire compressor cavity, and eliminating the need for high-power heating belts, thus reducing the cost and installation difficulty of heating belts.

Description

Technical Field

[0001] This application relates to the field of heat pump technology, specifically providing a control method for compressor preheating, electronic equipment, and a heat pump unit. Background Technology

[0002] With the widespread application of heat pump technology in the heating industry, the reliability of compressors in low-temperature environments has become a key factor restricting performance improvement. When compressors are stationary at low temperatures, problems arise such as increased lubricating oil viscosity affecting normal compressor startup, liquid refrigerant dissolving in the lubricating oil leading to liquid-laden compression, and excessively low internal temperature causing increased frictional resistance in the rotor during initial operation.

[0003] In related technologies, heating belts are used to locally heat the oil sump by arranging them on the outer side of the compressor's bottom. However, to meet the heating requirements of lubricating oil at low temperatures, the power of the heating belts needs to be increased, leading to a significant increase in cost. Increased power requires wider heating belts or multiple belts connected in parallel, but the limited space at the bottom of the compressor restricts installation. There is a power limit for a single heating belt; widening or arranging two heating belts not only occupies more space but also forces some belts to be installed in areas outside the oil sump, resulting in a significant reduction in heating efficiency. External installation of the heating belts means only one side contacts the compressor, while the other side loses heat directly to the environment, resulting in low heat utilization. Furthermore, the heating belts can only locally heat the bottom oil sump and cannot preheat residual lubricating oil on the inner wall of the compressor cavity, rotor, cylinder, and piston, affecting lubrication during startup. In short, related technologies using heating belts to preheat the compressor suffer from high cost, difficult installation, limited heating efficiency, significant heat loss, and uneven heating.

[0004] Therefore, a new technical solution is needed in this field to solve the above problems. Summary of the Invention

[0005] This application aims to solve the aforementioned technical problems, namely, the high cost, difficult installation, limited heating efficiency, large heat loss, and uneven heating of related technologies that use heating belts to preheat the compressor.

[0006] This application provides a control method for compressor preheating, the control method comprising: when the compressor is in a stopped state, acquiring the outdoor ambient temperature and compressor status parameters; if the outdoor ambient temperature is less than or equal to a first preset ambient temperature and the compressor status parameters meet preset preheating conditions, controlling the heating of the compressor windings; and adjusting the heating power of the windings according to the compressor status parameters and the outdoor ambient temperature.

[0007] According to one embodiment of this application, the compressor status parameters include the current exhaust temperature of the compressor, and the preset preheating condition includes the current exhaust temperature being less than or equal to a first preset exhaust temperature, wherein the value range of the first preset exhaust temperature Td_open is 70℃≥Td_open≥30℃.

[0008] According to one embodiment of this application, "adjusting the heating power of the winding according to the compressor state parameters and the outdoor ambient temperature" includes: determining P_winding = P1 - Tao when Td ≥ Td_open - △Td1; determining P_winding = P2 - Tao when Td_open - 2 * △Td1 ≤ Td < Td_open - △Td1; and determining P_winding = P3 - Tao when Td < Td_open - 2 * △Td1. Wherein, P_winding is the heating power of the winding, P1 is a first preset heating power, P2 is a second preset heating power, P3 is a third preset heating power, P3 > P2 > P1, Tao is the outdoor ambient temperature, Td is the current exhaust temperature, △Td1 is the first preset exhaust temperature difference, and 30℃ ≥ △Td1 ≥ 5℃.

[0009] According to one embodiment of this application, the compressor status parameters include the current rotor temperature of the compressor, and the preset preheating condition includes the current rotor temperature being less than or equal to a first preset rotor temperature, wherein the value range of the first preset rotor temperature T_r1 is 110℃≥T_r1>Td_open.

[0010] According to one embodiment of this application, the current rotor temperature is calculated as follows: T_rotor=Td+A*Tao+B*P_winding+C; where T_rotor is the current rotor temperature, A is the ambient temperature correction coefficient, -1<A<0, B is the power correction coefficient, -1<B<0, and C is the temperature correction parameter, 0℃<C<100℃.

[0011] According to one embodiment of this application, the compressor status parameters include the current shutdown duration of the compressor, and the preset preheating condition includes the current shutdown duration being greater than or equal to the minimum shutdown duration of the winding.

[0012] According to one embodiment of this application, the minimum downtime of the winding is calculated as follows: when Td0 ≥ Td_open, Δt_min = t1 is determined; when Td_open > Td0 ≥ Td_open - ΔTd2, Δt_min = t2 is determined; when Td_open - ΔTd2 > Td0, Δt_min = t3 is determined; where Td0 is the exhaust temperature when the compressor last stopped, ΔTd2 is the second preset exhaust temperature difference, 30℃ ≥ ΔTd2 ≥ 5℃, Δt_min is the minimum downtime of the winding, t1 is the first preset time, t2 is the second preset time, t3 is the third preset time, 90min > t1 > t2 > t3 > 0min.

[0013] According to one embodiment of this application, if the compressor meets any one of the following shutdown conditions, the winding heating is controlled to stop; the shutdown conditions include one or more of the following: the compressor receives a start command, the current shutdown duration is less than the minimum shutdown duration of the winding, the current exhaust temperature is greater than or equal to a second preset exhaust temperature, the outdoor ambient temperature is greater than a second preset ambient temperature, the current rotor temperature is greater than or equal to a second preset rotor temperature, the start duration of the winding heating is greater than or equal to the maximum allowable duration of the winding, the compressor exhaust temperature sensor malfunctions, and the compressor outdoor temperature sensor malfunctions; wherein, the second preset exhaust temperature is greater than the first preset exhaust temperature, the second preset ambient temperature is greater than the first preset ambient temperature, and the second preset rotor temperature is greater than the first preset rotor temperature.

[0014] This application also provides an electronic device including a processor and a storage device, the storage device being adapted to store a plurality of program codes, the program codes being adapted to be loaded and run by the processor to perform the compressor preheating control method of the above embodiments.

[0015] This application also provides a heat pump unit, which includes the above-described electronic equipment.

[0016] When employing the above technical solution, this application acquires the outdoor ambient temperature and compressor status parameters when the compressor is in a stopped state. When the outdoor ambient temperature is low and may affect the normal start-up of the compressor, the compressor windings are energized to heat the inside of the compressor cavity. Auxiliary heating via the compressor's own windings allows for uniform preheating of the entire compressor cavity, effectively evaporating residual liquid refrigerant and preheating the liquid refrigerant drawn in at startup. This significantly reduces the risk of liquid carryover during initial startup, improves low-temperature lubrication conditions, enhances the compressor's low-temperature start-up reliability and heating efficiency, and extends the compressor's service life. Furthermore, this solution achieves good preheating without requiring a high-power heating element, which helps reduce costs. In addition, this application adjusts the winding heating power according to the compressor status parameters and outdoor ambient temperature, which helps avoid excessive power consumption leading to energy waste or winding overheating while ensuring sufficient preheating. This allows for adaptation to different shutdown durations and low-temperature levels, achieving a balance between heating efficiency and reliability. Attached Figure Description

[0017] The preferred embodiments of this application are described below with reference to the accompanying drawings, in which:

[0018] Figure 1 This is a flowchart of the steps of a control method provided in this application;

[0019] Figure 2 This is a schematic diagram of the structure of an electronic device provided in this application;

[0020] Figure 3 This is a schematic diagram of the structure of a compressor provided in this application. Detailed Implementation

[0021] Preferred embodiments of this application will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of this application and are not intended to limit the scope of protection of this application.

[0022] In the description of this application, "module" and "processor" can include hardware, software, or a combination of both. A module can include hardware circuitry, various suitable sensors, communication ports, memory, and may also include software components, such as program code, or a combination of software and hardware. A processor can be a central processing unit, microprocessor, image processor, digital signal processor, or any other suitable processor. The processor has data and / or signal processing capabilities. The processor can be implemented in software, in hardware, or a combination of both. Computer-readable storage media includes any suitable medium capable of storing program code, such as magnetic disks, hard disks, optical disks, flash memory, read-only memory, random access memory, etc. The term "A and / or B" means all possible combinations of A and B, such as only A, only B, or A and B. The terms "at least one A or B" or "at least one of A and B" have a similar meaning to "A and / or B" and can include only A, only B, or A and B. The singular terms "a" or "this" can also include plural forms.

[0023] This application provides a method for controlling compressor preheating.

[0024] Combination Figure 1 As shown, the compressor preheating control method provided in this application includes the following steps:

[0025] S101: When the compressor is in a stopped state, acquire the outdoor ambient temperature and compressor status parameters.

[0026] Optionally, the heat pump unit includes an outdoor heat exchanger, the surface of which is equipped with an ambient temperature sensor to detect the outdoor ambient temperature.

[0027] Optionally, the compressor status parameters include: current discharge temperature, current rotor temperature, and current downtime. These compressor status parameters can be obtained through sensor detection or calculation.

[0028] S102, if the outdoor ambient temperature is less than or equal to the first preset ambient temperature, and the compressor status parameters meet the preset preheating conditions, then control the compressor winding heating.

[0029] It is understandable that the compressor windings are heated by energizing them. The heating power of the windings can be adjusted by changing the current intensity.

[0030] Optionally, the first preset ambient temperature Ta1 is in the range of -40℃ to 25℃.

[0031] In the exemplary embodiments, the specific value of the first preset ambient temperature Ta1 is not fixed in this application, and those skilled in the art can adjust it according to the actual situation of the heat pump unit. For example, the first preset ambient temperature Ta1 is -40℃, -35℃, -30℃, -20℃, -10℃, 0℃, 5℃, 10℃, 15℃, or 20℃, etc.

[0032] Meeting the preset preheating conditions for compressor status parameters can prevent damage to the compressor and prevent energy waste caused by ineffective heating when preheating is not required.

[0033] Optionally, the preset preheating conditions include one or more of the following: the current exhaust temperature is less than or equal to the first preset exhaust temperature, the current rotor temperature is less than or equal to the first preset rotor temperature, and the current shutdown duration is greater than or equal to the minimum shutdown duration of the winding.

[0034] S103 adjusts the heating power of the windings according to the compressor status parameters and the outdoor ambient temperature.

[0035] When employing the above technical solution, this application acquires the outdoor ambient temperature and compressor status parameters when the compressor is in a stopped state. When the outdoor ambient temperature is low and may affect the normal start-up of the compressor, the compressor windings are energized to heat the inside of the compressor cavity. Auxiliary heating via the compressor's own windings allows for uniform preheating of the entire compressor cavity, effectively evaporating residual liquid refrigerant and preheating the liquid refrigerant drawn in at startup. This significantly reduces the risk of liquid carryover during initial startup, improves low-temperature lubrication conditions, enhances the compressor's low-temperature start-up reliability and heating efficiency, and extends the compressor's service life. Furthermore, this solution achieves good preheating without requiring a high-power heating element, which helps reduce costs. In addition, this application adjusts the winding heating power according to the compressor status parameters and outdoor ambient temperature, which helps avoid excessive power consumption leading to energy waste or winding overheating while ensuring sufficient preheating. This allows for adaptation to different shutdown durations and low-temperature levels, achieving a balance between heating efficiency and reliability.

[0036] Optionally, combined Figure 3 As shown, a heating belt 1 is arranged at the bottom of the compressor, below the enthalpy-increasing inlet and the cylinder inlet. This application does not require changes to the compressor structure, utilizing the windings and heating belt together to preheat the compressor.

[0037] In some embodiments, the compressor status parameters include the compressor's current exhaust temperature, and the preset preheating conditions include the current exhaust temperature being less than or equal to a first preset exhaust temperature.

[0038] The current exhaust temperature can indirectly indicate the overall temperature level inside the compressor cavity. If the current exhaust temperature is less than or equal to the first preset exhaust temperature, the internal temperature of the cavity is too low, which may affect lubrication and compressor startup. In this case, activating the winding heating can ensure smooth compressor startup. If the current exhaust temperature is greater than the first preset exhaust temperature, compressor preheating is unnecessary, reducing unnecessary preheating energy consumption.

[0039] Optionally, combined Figure 3 As shown, an exhaust temperature sensor is installed on the top of the compressor housing, which can detect the current exhaust temperature. It is understandable that even when the compressor is stopped, the exhaust temperature sensor can still effectively report the temperature value, i.e., the current exhaust temperature, which reflects the overall temperature level inside the compressor cavity.

[0040] Optionally, the first preset exhaust temperature Td_open can be set to a value of 70℃ ≥ Td_open ≥ 30℃.

[0041] In the exemplary embodiments, the specific value of the first preset exhaust temperature Td_open is not fixed in this application, and those skilled in the art can adjust it according to the actual situation of the heat pump unit. For example, the first preset exhaust temperature Td_open is 30℃, 35℃, 40℃, 45℃, 50℃, 55℃, 60℃, 65℃, or 70℃, etc.

[0042] In some embodiments, step S103, "adjusting the heating power of the winding according to the compressor status parameters and the outdoor ambient temperature," includes: determining P_winding = P1 - Tao when Td ≥ Td_open - △Td1; determining P_winding = P2 - Tao when Td_open - 2 * △Td1 ≤ Td < Td_open - △Td1; and determining P_winding = P3 - Tao when Td < Td_open - 2 * △Td1. Wherein, P_winding is the heating power of the winding, P1 is the first preset heating power, P2 is the second preset heating power, P3 is the third preset heating power, P3 > P2 > P1, Tao is the outdoor ambient temperature, Td is the current exhaust temperature, Td_open is the first preset exhaust temperature (70℃ ≥ Td_open ≥ 30℃), and △Td1 is the first preset exhaust temperature difference (30℃ ≥ △Td1 ≥ 5℃).

[0043] Based on the overall temperature level inside the compressor cavity reflected by the current exhaust temperature Td, the heating power of the windings is divided into three levels to achieve adaptive control of the temperature rise rate. Specifically, when the current exhaust temperature Td is high, it indicates that the overall temperature inside the compressor cavity is relatively high. In this case, a lower power is used for slow heating to prevent local overheating or excessively rapid temperature rise from causing thermal damage to the compressor. When the current exhaust temperature Td is low, it indicates that the overall temperature inside the compressor cavity is relatively low and the preheating requirement is urgent. In this case, a higher power is used for rapid heating to shorten the preheating waiting time and ensure the preheating effect. In addition, by introducing the outdoor ambient temperature Tao to correct the power, insufficient winding heating in low-temperature environments or redundant winding power in high-temperature environments is further avoided, ensuring the preheating effect and accuracy of the compressor.

[0044] Optionally, 200W > P3 > P2 > P1 > 50W.

[0045] In the exemplary embodiments, the specific values ​​of the first preset heating power P1, the second preset heating power P2, and the third preset heating power P3 are not fixed in this application, and those skilled in the art can adjust them according to the actual situation of the heat pump unit. For example, the first preset heating power P1 is 120W, the second preset heating power P2 is 150W, and the third preset heating power P3 is 180W; or the first preset heating power P1 is 120W, the second preset heating power P2 is 140W, and the third preset heating power P3 is 160W.

[0046] In the exemplary embodiments, the specific value of the first preset exhaust temperature difference △Td1 is not fixed and can be adjusted by those skilled in the art according to the actual situation of the heat pump unit. For example, the first preset exhaust temperature difference △Td1 is 5℃, 10℃, 15℃, 20℃, 25℃ or 30℃, etc.

[0047] For example, Tao is 0℃, P1 is 60℃, P2 is 80℃, P3 is 100℃, Td_open is 60℃, and ΔTd1 is 10℃. When Td ≥ Td_open - ΔTd1 = 60 - 10℃, P_winding = P1 - Tao = 60 - 0 = 60W; when 60 - 10 * 2 ≤ Td < 60 - 10℃, P_winding = P2 - Tao = 80 - 0 = 80W; when Td < 60 - 2 * 10℃, P_winding = 100 - 0 = 100W.

[0048] In some embodiments, the compressor status parameters include the current rotor temperature of the compressor, and the preset preheating conditions include the current rotor temperature being less than or equal to a first preset rotor temperature, wherein the value range of the first preset rotor temperature T_r1 is 110℃≥T_r1>Td_open.

[0049] Setting the current rotor temperature T_rotor to be less than or equal to the first preset rotor temperature T_r1 is one of the necessary conditions for enabling winding heating. During compressor operation, the rotor is a rotating component, and its temperature is directly affected by winding heating and frictional heat generation. After shutdown, the rotor temperature decays at a different rate than the exhaust temperature. Directly monitoring or calculating the rotor temperature allows for a more accurate determination of whether the compressor's core components are adequately cooled. Setting T_r1 higher than Td_open means that even if the exhaust temperature has dropped to the level requiring heating (Td ≤ Td_open), if the rotor still retains sufficient residual heat (the condition T_rotor > T_r1 is not triggered), the system can choose not to heat temporarily, avoiding unnecessary energy consumption and winding thermal stress.

[0050] In the exemplary embodiments, the specific value of the first preset rotor temperature T_r1 is not fixed and can be adjusted by those skilled in the art according to the actual situation of the heat pump unit. For example, the first preset rotor temperature T_r1 is 70℃, 75℃, 80℃, 85℃, or 110℃, etc.

[0051] In some embodiments, the current rotor temperature is calculated as follows: T_rotor=Td+A*Tao+B*P_winding+C; where T_rotor is the current rotor temperature, A is the ambient temperature correction coefficient, -1<A<0, B is the power correction coefficient, -1<B<0, and C is the temperature correction parameter, 0℃<C<100℃.

[0052] Since the rotor is a rotating component, its temperature cannot be directly measured using traditional sensors. This formula estimates the current rotor temperature using existing sensors and known control parameters, achieving low-cost, contactless temperature sensing. By introducing an ambient temperature correction term A×Tao and a heating power correction term B×P_winding, the model can adapt to the rotor temperature rise characteristics under different ambient temperatures and heating powers, ensuring that the estimated rotor temperature remains highly accurate under various operating conditions. C, as a temperature correction parameter, is used to compensate for systematic biases in the model when applied to different compressor models, ensuring the accuracy of the estimated value.

[0053] In the exemplary embodiments, the specific value of the ambient temperature correction factor A is not fixed and can be adjusted by those skilled in the art according to the actual situation of the heat pump unit. For example, A can be -1, -0.3512, -0.2924, or -0.1403110, etc.

[0054] In the exemplary embodiments, the specific value of the power correction factor B is not fixed and can be adjusted by those skilled in the art according to the actual situation of the heat pump unit. For example, B can be -1, -0.30, -0.25, -0.20, or -0.10, etc.

[0055] In the exemplary embodiments, the specific value of the temperature correction parameter C is not fixed and can be adjusted by those skilled in the art according to the actual situation of the heat pump unit. For example, C can be 0°C, 5°C, 20°C, 50°C, 70°C, or 95°C, etc.

[0056] In some embodiments, the compressor status parameters include the current shutdown duration Δt1 of the compressor, and the preset preheating condition includes the current shutdown duration Δt1 being greater than or equal to the minimum winding shutdown duration Δt_min. The current shutdown duration Δt1 refers to the time interval from the compressor's most recent shutdown to the current moment. Shortly after the compressor stops, the cavity still retains a high level of residual heat. If the winding heating is immediately activated at this time, the internal temperature of the compressor will become too high, affecting the rotor's lifespan and even burning out the rotor. By ensuring that the current shutdown duration Δt1 is greater than or equal to the minimum winding shutdown duration Δt_min, damage to the compressor can be avoided.

[0057] Optionally, the minimum winding downtime Δt_min is calculated as follows: when Td0 ≥ Td_open, Δt_min = t1 is determined; when Td_open > Td0 ≥ Td_open - ΔTd2, Δt_min = t2 is determined; when Td_open - ΔTd2 > Td0, Δt_min = t3 is determined; where Td0 is the exhaust temperature when the compressor last stopped, ΔTd2 is the second preset exhaust temperature difference (30℃ ≥ ΔTd2 ≥ 5℃), Δt_min is the minimum winding downtime, t1 is the first preset time, t2 is the second preset time, t3 is the third preset time (90min > t1 > t2 > t3 > 0min).

[0058] The discharge temperature Td0 at the time of the compressor's last shutdown directly reflects the thermal state inside the compressor cavity at the moment of shutdown. This embodiment dynamically determines the minimum shutdown time based on the actual thermal state of the compressor at shutdown. A higher Td0 indicates a higher internal temperature immediately after shutdown, requiring a longer time to cool to a lower temperature. When Td0 is high, a larger first preset time t1 is used to extend the minimum shutdown time Δt_min of the windings. This prevents the windings from being energized and heated before the residual heat of the compressor has dissipated, avoiding unnecessary heat accumulation from re-energizing the windings under high temperatures, and reducing the risk of insulation aging and thermal damage. When Td0 is low, the internal temperature of the compressor cavity is low, resulting in higher safety. A smaller calculated minimum shutdown time Δt_min allows for earlier initiation of winding heating.

[0059] In the exemplary embodiments, the specific value of the second preset exhaust temperature difference ΔTd2 is not fixed and can be adjusted by those skilled in the art according to the actual situation of the heat pump unit. For example, ΔTd2 can be 5℃, 10℃, 15℃, 20℃, 25℃, or 30℃, etc.

[0060] In the exemplary embodiments, the specific values ​​of t1, t2, and t3 are not fixed in this application, and those skilled in the art can adjust them according to the actual situation of the heat pump unit. For example, t1 is 70 min, t2 is 50 min, and t3 is 30 min; or t1 is 90 min, t2 is 60 min, and t3 is 30 min.

[0061] For example, Td_open is 60℃ and ΔTd2 is 10℃. When Td0≥60℃, Δt_min=t1=30min is determined; when 60℃>Td0≥60℃-10℃, Δt_min=t2=20min is determined; when 60℃-10℃>Td0, Δt_min=t3=10min is determined.

[0062] Alternatively, the minimum winding downtime can be a pre-set fixed duration. For example, the minimum winding downtime can be 10 min, 20 min, 30 min, 40 min, or 50 min.

[0063] In some embodiments, if the compressor meets any one of the shutdown conditions, the control winding heating is stopped. The shutdown conditions include one or more of the following: the compressor receives a start-up command; the current shutdown duration is less than the minimum shutdown duration of the winding; the current discharge temperature is greater than or equal to a second preset discharge temperature; the outdoor ambient temperature is greater than a second preset ambient temperature; the current rotor temperature is greater than or equal to a second preset rotor temperature; the winding heating start-up duration is greater than or equal to the maximum allowable winding duration; a fault in the compressor's discharge temperature sensor; and a fault in the compressor's outdoor temperature sensor. Wherein, the second preset discharge temperature is greater than the first preset discharge temperature, the second preset ambient temperature is greater than the first preset ambient temperature, and the second preset rotor temperature is greater than the first preset rotor temperature.

[0064] When the compressor receives a start command, it indicates that the user has a normal heating or cooling demand. The unit should respond to the start command first rather than continue preheating. Therefore, the winding heating should be stopped immediately and the normal start-up process should be entered.

[0065] When the current downtime is less than the minimum downtime of the winding, it indicates that the compressor has not cooled down sufficiently. Continuing to heat may result in ineffective energy consumption or thermal stress, so the winding stops heating.

[0066] When the current exhaust temperature Td is greater than or equal to the second preset exhaust temperature Td_close, it indicates that the cavity temperature is high enough and no further preheating is needed. Winding heating should be stopped to prevent overheating. The second preset exhaust temperature Td_close is greater than the first preset exhaust temperature Td_open, where 77℃ ≥ Td_close ≥ 35℃. For example, Td_close is 65℃.

[0067] When the outdoor ambient temperature Tao is greater than the second preset ambient temperature Ta2, winding heating stops. The second preset ambient temperature Ta2 is greater than the first preset ambient temperature Ta1. At this time, it indicates that the outdoor ambient temperature Tao is already high, and the compressor can start normally without preheating assistance. The second preset ambient temperature Ta2 being greater than the first preset ambient temperature Ta1 avoids frequent switching of the winding heating. In the exemplary embodiment, the specific value of the second preset ambient temperature Ta2 is not fixed and can be adjusted by those skilled in the art according to the actual situation of the heat pump unit. For example, Ta2 = Ta1 + 2℃; or Ta2 = Ta1 + 3℃.

[0068] When the current rotor temperature T_r1 is greater than or equal to the second preset rotor temperature T_r2, winding heating is stopped. The second preset rotor temperature T_r2 is greater than the first preset rotor temperature T_r1. At this point, the rotor has been fully preheated, and continued heating may exceed the safe temperature and damage the rotor. Optionally, 115℃ ≥ T_r2 > Td_close, for example, T_r2 = 70℃.

[0069] When the winding heating duration is greater than or equal to the maximum allowable duration of the winding, the winding heating should be stopped. This can prevent damage to the winding.

[0070] If the compressor's discharge temperature sensor or the outdoor temperature sensor malfunctions, the winding heating will stop. This avoids misjudgments caused by incorrect signals (such as unlimited heating or no heating). Heating will be stopped, the fault will be reported, and the system will enter safety protection mode.

[0071] Furthermore, this application also provides an electronic device. Combined with Figure 2 As shown, the electronic device in this embodiment mainly includes a processor 1001 and a storage device 1002. The storage device 1002 can be configured to store a program for executing the compressor preheating control method of the above-described method embodiments. The processor 1001 can be configured to execute the program in the storage device 1002, which includes, but is not limited to, a program for executing the compressor preheating control method of the above-described method embodiments. For ease of explanation, only the parts related to the embodiments of this application are shown. For specific technical details not disclosed, please refer to the method section of the embodiments of this application.

[0072] In some possible embodiments of this application, the electronic device may include multiple processors 1001 and multiple storage devices 1002. The program executing the program initiation method of the above method embodiments may be divided into multiple subroutines, each of which can be loaded and run by a processor 1001 to execute different steps of the program initiation method of the above method embodiments. Specifically, each subroutine may be stored in different storage devices 1002, and each processor 1001 may be configured to execute programs in one or more storage devices 1002 to jointly implement the compressor preheating control method of the above method embodiments; that is, each processor 1001 executes different steps of the program initiation method of the above method embodiments to jointly implement the compressor preheating control method of the above method embodiments.

[0073] The aforementioned multiple processors 1001 can be processors deployed on the same device. For example, the aforementioned electronic device can be a high-performance device composed of multiple processors, and the aforementioned multiple processors 1001 can be processors configured on that high-performance device. Alternatively, the aforementioned multiple processors 1001 can also be processors deployed on different devices. For example, the aforementioned electronic device can be a server cluster, and the aforementioned multiple processors 1001 can be processors on different servers within the server cluster.

[0074] Furthermore, this application also provides a computer-readable storage medium. In one embodiment of the computer-readable storage medium according to this application, the computer-readable storage medium can be configured to store a program for executing the compressor preheating control method of the above-described method embodiments. This program can be loaded and run by a processor to implement the compressor preheating control method. For ease of explanation, only the parts related to the embodiments of this application are shown; for specific technical details not disclosed, please refer to the method section of the embodiments of this application. The computer-readable storage medium can be a storage device device comprising various electronic devices. Optionally, in the embodiments of this application, the computer-readable storage medium is a non-transitory computer-readable storage medium.

[0075] Furthermore, this application also provides a heat pump unit, which includes the aforementioned electronic equipment.

[0076] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments of this application can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or some intermediate form. The computer-readable storage medium can include any entity or device capable of carrying the computer program code, a medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory, a random access memory, an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc.

[0077] The technical solutions of this application have been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. A method for controlling compressor preheating, characterized in that, The control method includes: When the compressor is in a stopped state, acquire the outdoor ambient temperature and compressor status parameters; If the outdoor ambient temperature is less than or equal to the first preset ambient temperature, and the compressor status parameters meet the preset preheating conditions, then the compressor winding heating is controlled. The heating power of the winding is adjusted according to the compressor status parameters and the outdoor ambient temperature.

2. The control method according to claim 1, characterized in that, The compressor status parameters include the current exhaust temperature of the compressor, and the preset preheating conditions include the current exhaust temperature being less than or equal to a first preset exhaust temperature, wherein the value range of the first preset exhaust temperature Td_open is 70℃≥Td_open≥30℃.

3. The control method according to claim 2, characterized in that, "Adjusting the heating power of the winding according to the compressor status parameters and the outdoor ambient temperature" includes: If Td≥Td_open-△Td1, then P_winding=P1-Tao; In the case that Td_open-2*△Td1≤Td<Td_open-△Td1, determine P_winding=P2-Tao; If Td < Td_open - 2 * △Td1, then P_winding = P3 - Tao; Wherein, P_winding is the heating power of the winding, P1 is the first preset heating power, P2 is the second preset heating power, P3 is the third preset heating power, P3>P2>P1, Tao is the outdoor ambient temperature, Td is the current exhaust temperature, △Td1 is the first preset exhaust temperature difference, 30℃≥△Td1≥5℃.

4. The control method according to claim 2, characterized in that, The compressor status parameters include the current rotor temperature of the compressor, and the preset preheating conditions include the current rotor temperature being less than or equal to a first preset rotor temperature, wherein the value range of the first preset rotor temperature T_r1 is 110℃≥T_r1>Td_open.

5. The control method according to claim 4, characterized in that, The current rotor temperature is calculated using the following method: T_rotor=Td+A*Tao+B*P_winding+C; Where T_rotor is the current rotor temperature, A is the ambient temperature correction coefficient (-1 < A < 0), B is the power correction coefficient (-1 < B < 0), and C is the temperature correction parameter (0℃ < C < 100℃).

6. The control method according to claim 4, characterized in that, The compressor status parameters include the current shutdown duration of the compressor, and the preset preheating conditions include the current shutdown duration being greater than or equal to the minimum shutdown duration of the winding.

7. The control method according to claim 6, characterized in that, The minimum downtime of the winding is calculated using the following method: If Td0 ≥ Td_open, then Δt_min = t1. Given that Td_open>Td0≥Td_open-△Td2, determine △t_min=t2; Given that Td_open-△Td2>Td0, determine that △t_min=t3; Wherein, Td0 is the exhaust temperature when the compressor last stopped, △Td2 is the second preset exhaust temperature difference, 30℃≥△Td2≥5℃, △t_min is the minimum shutdown time of the winding, t1 is the first preset time, t2 is the second preset time, t3 is the third preset time, 90min>t1>t2>t3>0min.

8. The control method according to claim 6, characterized in that, If the compressor meets any one of the shutdown conditions, then the winding is controlled to stop heating; The shutdown conditions include one or more of the following: the compressor receives a start command; the current shutdown duration is less than the minimum shutdown duration of the winding; the current exhaust temperature is greater than or equal to the second preset exhaust temperature; the outdoor ambient temperature is greater than the second preset ambient temperature; the current rotor temperature is greater than or equal to the second preset rotor temperature; the start duration of the winding heating is greater than or equal to the maximum allowable duration of the winding; the compressor's exhaust temperature sensor is faulty; and the compressor's outdoor temperature sensor is faulty. Wherein, the second preset exhaust temperature is greater than the first preset exhaust temperature, the second preset ambient temperature is greater than the first preset ambient temperature, and the second preset rotor temperature is greater than the first preset rotor temperature.

9. An electronic device comprising a processor and a storage device, said storage device being adapted to store a plurality of program codes, characterized in that, The program code is adapted to be loaded and run by the processor to perform the compressor preheating control method according to any one of claims 1 to 8.

10. A heat pump unit, characterized in that, The heat pump unit includes the electronic equipment described in claim 9.

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