Defrosting control method and device, electronic equipment, storage medium and program product

Abstract

This application discloses a defrosting control method, device, electronic equipment, storage medium, and program product. The method includes: after the heat pump unit enters defrosting mode, controlling the fan to stop running or to run in reverse at the lowest speed; when the target evaporation temperature corresponding to the heat exchanger is detected to be greater than or equal to 0, controlling the fan to run in reverse at the corresponding speed according to the temperature rise rate corresponding to the target evaporation temperature. This reduces heat exchange between the heat exchanger and the external environment in the early stages of defrosting, allowing more heat to be concentrated on melting the frost layer and preventing unmelted frost from refreezing due to rapid cold air flow, thus improving defrosting efficiency. Furthermore, by controlling the fan to run in reverse at the corresponding speed according to the temperature rise rate corresponding to the target evaporation temperature, it dynamically adapts to defrosting needs, optimizes heat exchange efficiency, assists in accelerating defrosting, and prevents excessive heat exchanger temperature from damaging components, ensuring stable pressure and temperature during defrosting and improving equipment safety.

Description

Technical Field

[0001] This application relates to the field of electrical equipment control technology, and in particular to a defrosting control method, device, electronic equipment, storage medium and program product. Background Technology

[0002] During operation, frost may form on the surface of the evaporator in a heat pump system. The frost layer adhering to the evaporator surface can block the air duct, reduce the air volume, and also reduce the heat transfer coefficient, resulting in less heat absorption by the evaporator and affecting the heat exchange effect.

[0003] Therefore, when the evaporator is frosted to a certain extent, defrosting operation must be performed to melt the frost layer on the evaporator surface and restore good heat exchange capacity. However, in the traditional defrosting control process, the unit is usually switched from heating mode to cooling mode. At this time, the fan is in a stopped state, and defrosting is mainly achieved by the heat generated by the refrigerant circulation and the natural convection heat exchange between the refrigerant and the environment. Not only is the defrosting process time-consuming, but the heat loss is also relatively significant. Summary of the Invention

[0004] This application provides a defrosting control method, device, electronic equipment, storage medium, and program product. It controls the fan to stop or reverse at its lowest speed after the heat pump unit enters defrosting mode, reducing heat exchange between the heat exchanger and the external environment. This allows more heat to be concentrated on melting the frost layer, reducing heat loss and preventing unmelted frost from refreezing due to rapid cold air flow, thus improving defrosting efficiency. Furthermore, when the target evaporation temperature of the heat exchanger is detected to be greater than or equal to a first preset temperature, the fan is controlled to reverse at the corresponding speed based on the temperature rise rate corresponding to the target evaporation temperature. This dynamically adapts to defrosting needs, optimizes heat exchange efficiency, and accelerates defrosting. Simultaneously, it prevents excessive heat exchanger temperature from damaging components, ensuring stable pressure and temperature during defrosting and improving equipment safety. The above technical solution is as follows: In a first aspect, embodiments of this application provide a defrosting control method applied to a heat pump unit, wherein the heat pump unit includes a heat exchanger and a fan; the method includes: After the heat pump unit enters the defrost mode, the fan is controlled to stop running or run in reverse at the lowest speed. When the target evaporation temperature corresponding to the heat exchanger is detected to be greater than or equal to the first preset temperature, the fan is controlled to run in reverse at the corresponding speed according to the temperature rise rate corresponding to the target evaporation temperature.

[0005] In one possible implementation, controlling the fan to reverse its rotational speed according to the temperature rise rate corresponding to the target evaporation temperature includes: When the temperature rise rate corresponding to the target evaporation temperature is less than the first rate, the above-mentioned fan is controlled to stop running or to run in reverse at the lowest speed. When the temperature rise rate corresponding to the target evaporation temperature is greater than or equal to the first rate and less than or equal to the second rate, the fan is controlled to increase the first target value at the current speed and then reverse to run; the second rate is greater than the first rate and the first rate is greater than 0. When the temperature rise rate corresponding to the target evaporation temperature is greater than the second rate, the fan is controlled to increase the second target value at the current speed and then reverse to run; the second target value is greater than the first target value.

[0006] In one possible implementation, the air ducts of the heat exchanger and / or the fan are different, and the corresponding first speed and second speed are also different.

[0007] In one possible implementation, the aforementioned temperature rise rate for: ;in, The number of temperature points detected; The sampling time intervals corresponding to different temperature points; This represents the target evaporation temperature corresponding to the heat exchanger mentioned above.

[0008] In one possible implementation, the aforementioned heat pump unit further includes a temperature sensor and a pressure sensor; the aforementioned method also includes: The temperature sensor is controlled to detect the evaporation temperature of the heat exchanger, and the evaporation temperature detection value is obtained. The pressure sensor is controlled to detect the low-pressure side pressure of the heat pump unit and obtain the pressure detection value. The saturation temperature of the heat pump unit is determined based on the pressure detection values ​​mentioned above. Based on the above-mentioned evaporation temperature detection value and the above-mentioned saturation temperature, the target evaporation temperature corresponding to the above-mentioned heat exchanger is determined.

[0009] In one possible implementation, the above method also includes: When the target evaporation temperature is detected to be higher than the second preset temperature, or when the duration of the heat pump unit in defrost mode reaches the first preset duration, or when the high-pressure side pressure of the heat pump unit is detected to be greater than the preset pressure, the heat pump unit is controlled to exit the defrost mode.

[0010] In one possible implementation, the aforementioned heat pump unit further includes a compressor and a four-way valve; the aforementioned method also includes: When the heat pump unit meets the conditions for entering defrost, the current operating frequency of the compressor is reduced to the preset reversing frequency and the four-way valve is controlled to reverse so that the heat pump unit enters the defrost mode. After the heat pump unit enters the defrost mode, the current operating frequency of the compressor is increased from the preset reversing frequency to the preset defrost frequency and then maintained at the preset defrost frequency for defrost operation.

[0011] In one possible implementation, the above-mentioned defrosting conditions include the target evaporation temperature being lower than a third preset temperature, or the target evaporation temperature being lower than the third preset temperature and the duration of the lower temperature reaching a second preset duration.

[0012] Secondly, embodiments of this application provide a defrosting control device applied to a heat pump unit, wherein the heat pump unit includes a heat exchanger and a fan; the defrosting control device includes: The first control module is used to control the above-mentioned fan to stop running or to run in reverse at the lowest speed after the above-mentioned heat pump unit enters the defrosting mode. The second control module is used to control the fan to reverse its operation at the corresponding speed according to the temperature rise rate corresponding to the target evaporation temperature when the target evaporation temperature is detected to be greater than or equal to the first preset temperature.

[0013] In one possible implementation, the second control module described above is specifically used for: When the temperature rise rate corresponding to the target evaporation temperature is less than the first rate, the fan is controlled to stop running or reverse at the lowest speed; when the temperature rise rate corresponding to the target evaporation temperature is greater than or equal to the first rate and less than or equal to the second rate, the fan is controlled to increase the first target value at the current speed and then reverse; the second rate is greater than the first rate, and the first rate is greater than 0; when the temperature rise rate corresponding to the target evaporation temperature is greater than the second rate, the fan is controlled to increase the second target value at the current speed and then reverse; the second target value is greater than the first target value.

[0014] In one possible implementation, the air ducts of the heat exchanger and / or the fan are different, and the corresponding first speed and second speed are also different.

[0015] In one possible implementation, the aforementioned temperature rise rate for: ;in, The number of temperature points detected; The sampling time intervals corresponding to different temperature points; This represents the target evaporation temperature corresponding to the heat exchanger mentioned above.

[0016] In one possible implementation, the aforementioned heat pump unit further includes a temperature sensor and a pressure sensor; the aforementioned defrosting control device further includes: The third control module is used to control the temperature sensor to detect the evaporation temperature of the heat exchanger and obtain the evaporation temperature detection value. The fourth control module is used to control the pressure sensor to detect the low-pressure side pressure of the heat pump unit and obtain the pressure detection value. The first determining module is used to determine the saturation temperature corresponding to the heat pump unit based on the pressure detection value. The second determining module is used to determine the target evaporation temperature corresponding to the heat exchanger based on the above-mentioned evaporation temperature detection value and the above-mentioned saturation temperature.

[0017] In one possible implementation, the defrosting control device further includes: The fifth control module is used to control the heat pump unit to exit the defrost mode when the target evaporation temperature is detected to be higher than the second preset temperature, or when the duration of the heat pump unit in defrost mode reaches the first preset duration, or when the high-pressure side pressure of the heat pump unit is detected to be greater than the preset pressure.

[0018] In one possible implementation, the aforementioned heat pump unit further includes a compressor and a four-way valve; the aforementioned defrosting control device further includes: The sixth control module is used to reduce the current operating frequency of the compressor to a preset reversing frequency and control the four-way valve to reverse when the heat pump unit meets the conditions for entering defrost mode. The seventh control module is used to increase the current operating frequency of the compressor from the preset reversing frequency to the preset defrosting frequency after the heat pump unit enters the defrosting mode, and then maintain the preset defrosting frequency for defrosting operation.

[0019] In one possible implementation, the above-mentioned defrosting conditions include the target evaporation temperature being lower than a third preset temperature, or the target evaporation temperature being lower than the third preset temperature and the duration of the lower temperature reaching a second preset duration.

[0020] Thirdly, embodiments of this application provide an electronic device, including: a processor and a memory; The processor is connected to the memory. The aforementioned memory is used to store executable program code; The processor reads the executable program code stored in the memory to run a program corresponding to the executable program code, so as to execute the method provided in the first aspect of the embodiments of this specification.

[0021] Fourthly, embodiments of this application provide a computer storage medium storing multiple instructions adapted for loading and executing the method steps provided in the first aspect of embodiments of this application by a processor.

[0022] Fifthly, embodiments of this specification provide a computer program product containing instructions that, when run on a computer or processor, cause the computer or processor to execute the method steps provided by the first aspect of the embodiments of this specification or any possible implementation thereof.

[0023] The beneficial effects of the technical solutions provided in some embodiments of this application include at least the following: In one or more embodiments of this application, on the one hand, after the heat pump unit enters the defrost mode, the control fan stops running or runs in reverse at the lowest speed. This reduces heat exchange between the heat exchanger and the external environment, preventing defrost heat loss to the outside, allowing more heat to be concentrated on melting the frost layer, reducing heat loss and improving defrost efficiency. On the other hand, stopping the fan or running it in reverse at the lowest speed reduces the airflow speed, preventing unmelted frost from refreezing due to rapid cold air flow, ensuring continuous frost melting. Furthermore, running the fan in reverse at the lowest speed significantly reduces defrost energy consumption compared to high-speed operation, while also preventing a sudden drop in heat exchanger temperature caused by high-speed fan operation. Balancing defrosting efficiency and energy consumption; on the other hand, when the target evaporation temperature corresponding to the heat exchanger is detected to be greater than or equal to the first preset temperature, the fan is controlled to reverse at the corresponding speed according to the temperature rise rate corresponding to the target evaporation temperature. This not only allows for real-time adjustment of the fan's reverse speed based on the actual changes in the target evaporation temperature of the heat exchanger, blowing away the frost layer on the heat exchanger fins, thus dynamically adapting to defrosting needs, optimizing heat exchange efficiency, and accelerating defrosting, but also prevents the heat exchanger temperature from becoming too high and causing component damage by dynamically adjusting the fan's reverse speed through the temperature rise rate. At the same time, it ensures stable pressure and temperature during the defrosting process, improving the safety of the equipment during defrosting.

[0024] The above description is merely an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A schematic diagram of the architecture of an application system corresponding to a defrosting control method provided in an exemplary embodiment of this application; Figure 2 A schematic flowchart of a defrosting control method provided for an exemplary embodiment of this application; Figure 3 A schematic diagram illustrating the relationship between the temperature rise rate and the fan speed during the defrosting control process, provided as an exemplary embodiment of this application; Figure 4 A schematic flowchart of another defrosting control method provided for an exemplary embodiment of this application; Figure 5 A schematic diagram illustrating the joint control relationship between the compressor and the fan during the defrosting control process, provided as an exemplary embodiment of this application; Figure 6 A schematic diagram of the structure of a defrosting control device provided for an exemplary embodiment of this application; Figure 7 This is a schematic diagram of the structure of an electronic device provided as an exemplary embodiment of this application. Detailed Implementation

[0027] To make the features and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] The terms "first," "second," "third," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0029] The defrosting control method provided in this application can be applied, but is not limited to, to air conditioning systems with heat pump units. Please refer to the following... Figure 1 , Figure 1 This is a schematic diagram of the architecture of an air conditioning system provided for an exemplary embodiment of this specification. Figure 1 As shown, the above-mentioned air conditioning system may be, but is not limited to, a heat pump air conditioning system, such as... Figure 1As shown, it may be composed of, but is not limited to, a controller 110, an indoor heat exchanger 120, an indoor fan 130, a compressor 140, a four-way valve 150, an outdoor heat exchanger 160, an outdoor fan 170, and a throttling component 180.

[0030] Understandably, the air conditioning system provided in an exemplary embodiment of this application can both cool and heat. For example, but not limited to... Figure 1 As shown, compressor 140 has an exhaust port a and an intake port b. Exhaust port a of compressor 140 is connected to port D of four-way valve 150, intake port b of compressor 140 is connected to port S of four-way valve 150, outdoor heat exchanger 160 is connected to port C of four-way valve 150, and indoor heat exchanger 120 is connected to port E of four-way valve 150. This air conditioning system can switch between cooling and heating modes by changing the refrigerant flow direction through four-way valve 150.

[0031] When the air conditioning system is in heating mode, port D and port E of the four-way valve 150 are connected, and port C and port S are connected. The refrigerant circulation process is as follows: the compressed high-temperature and high-pressure gaseous refrigerant discharged from the exhaust port a of the compressor 140 flows through the ports D and E of the four-way valve 150 to the indoor heat exchanger 120 to exchange heat with the indoor fan 130, so as to condense into a medium-high temperature and high-pressure liquid refrigerant. After passing through the throttling component 180, it flows through the outdoor heat exchanger 160 to exchange heat and become a low-temperature and low-pressure gaseous refrigerant. Then, it flows back to the compressor 150 from the suction port b through the ports C and S of the four-way valve 150, completing the heating cycle.

[0032] During the cooling operation of the air conditioning system, port D and port C of the four-way valve 150 are connected, and port E and port S are connected. The refrigerant circulation process is as follows: the high-temperature and high-pressure gaseous refrigerant discharged from the discharge port a of the compressor 140 flows into port D of the four-way valve 150 and flows out from port C of the four-way valve 150. After passing through the outdoor heat exchanger 160 and the outdoor fan 170 to exchange heat and condense into a high-temperature and high-pressure liquid refrigerant, it flows through the throttling device 180 and then flows through the indoor heat exchanger 120 and the indoor fan 130 to exchange heat and absorb heat to become a low-temperature and low-pressure gaseous refrigerant. Finally, it flows back to the compressor 140 from the suction port b through the ports E and S of the four-way valve 150, completing the refrigeration cycle.

[0033] Understandably, the indoor heat exchanger 120 of the aforementioned air conditioning system can be configured with, for example, Figure 1 The indoor side fan 130 shown can be configured, in addition to air-to-refrigerant heat exchange, with corresponding water-side circulation components to achieve water-to-fluoride heat exchange. This application does not limit this aspect.

[0034] Specifically, when the heat pump unit is detected to meet the defrosting conditions, the controller 110 will switch it from heating operation to cooling operation to put it into defrosting mode. After the heat pump unit enters defrosting mode, the controller 110 will control the aforementioned fan to stop running or run in reverse at the lowest speed; when the target evaporation temperature corresponding to the aforementioned heat exchanger is detected to be greater than or equal to the first preset temperature, the controller will also control the aforementioned fan to run in reverse at the corresponding speed according to the temperature rise rate corresponding to the aforementioned target evaporation temperature.

[0035] Understandably, Figure 1 The number, model, and arrangement of the components in the air conditioning system shown are merely examples, and the embodiments in this specification do not impose specific limitations on them.

[0036] Next, combine Figure 1 This document describes the defrosting control method provided in the embodiments of this application. Please refer to the following for details. Figure 2 This is a schematic flowchart illustrating a defrosting control method provided in an exemplary embodiment of this application. Figure 2 As shown, this defrosting control method includes the following steps: S201, after the heat pump unit enters the defrost mode, the control fan stops running or runs in reverse at the lowest speed.

[0037] Specifically, the aforementioned defrosting mode is a specific operating mode activated by the heat pump unit during operation when frost has accumulated on the heat exchanger surface to a certain extent, in order to restore heat exchange capacity. Its core purpose is to melt the frost layer on the heat exchanger surface through a series of control strategies, thereby solving problems such as duct blockage, reduced airflow, and decreased heat transfer coefficient caused by frost. The aforementioned minimum speed refers to the minimum operating speed of the fan set at the initial stage of the heat pump unit entering defrosting mode to achieve a specific defrosting target; it is the basic speed threshold for the fan when running in reverse.

[0038] Optionally, when the heat pump unit meets the defrosting conditions and the controller switches to defrost mode, the controller sends a control command to the fan to stop it. This is because in the initial stage of defrosting, the surface temperature of the heat exchanger is low and the frost layer is relatively solid. If the fan continues to run forward, it will bring in cold air from the outside, which will not only fail to effectively promote the melting of the frost layer, but may also cause the temperature of the heat exchanger to drop further due to continuous heat absorption, affecting the defrosting efficiency. Choosing to stop the fan reduces the heat exchange between the heat exchanger and the outside environment, allowing the high-temperature, high-pressure refrigerant discharged from the compressor to be used more concentratedly to heat the heat exchanger, thereby quickly raising its surface temperature and creating favorable conditions for the subsequent melting of the frost layer.

[0039] Optionally, under certain operating conditions, after the heat pump unit enters defrost mode, the controller can also control the fan to run in reverse at the lowest speed. In this case, the airflow generated by the reverse-rotating fan is opposite to that during heating; it will not draw in cold air from the outside, but instead will blow away the small amount of water vapor or loosened frost debris generated near the heat exchanger due to temperature rise, thus assisting the defrosting process to some extent. At the same time, reversing the fan at the lowest speed also avoids excessive energy consumption or unnecessary disturbance to the heat exchanger during reverse operation.

[0040] Understandably, in the initial stage of defrosting mode, stopping the fan or running it in reverse at the lowest speed are two optional strategies, depending on the actual operating conditions (such as ambient temperature, frost thickness, etc.). The common goal of both is to reduce heat loss and prevent the frost from freezing again, but running it in reverse at the lowest speed can also help to blow away loose frost fragments with a weak airflow, further optimizing the defrosting effect.

[0041] S202, when the target evaporation temperature corresponding to the heat exchanger is detected to be greater than or equal to the first preset temperature, the fan is controlled to reverse at the corresponding speed according to the temperature rise rate corresponding to the target evaporation temperature.

[0042] Specifically, the heat exchanger is the core component of a heat pump unit, realizing heat exchange through the heat exchange between the refrigerant and the air to achieve heating or cooling functions. In heating mode, the outdoor heat exchanger acts as an evaporator to absorb heat from the outside, while the indoor heat exchanger acts as a condenser to release heat. In defrost mode, a four-way valve switches the outdoor heat exchanger to become a condenser, using the heat from the high-temperature refrigerant to melt the frost on its surface. The target evaporation temperature is a key temperature indicator that the heat exchanger needs to reach during the defrosting process, used to judge the progress of frost melting and control the fan speed. When the target evaporation temperature is ≥ the first preset temperature (e.g., but not limited to 0℃), it indicates that the frost has begun to melt, and at this time, the fan speed needs to be dynamically adjusted according to the temperature rise rate. The aforementioned temperature rise rate refers to the rate of change of the target evaporation temperature over time, a parameter reflecting the speed of frost melting.

[0043] In this embodiment, on the one hand, after the heat pump unit enters the defrost mode, the control fan stops running or runs in reverse at the lowest speed. This reduces heat exchange between the heat exchanger and the external environment, preventing defrost heat from dissipating to the outside, allowing more heat to be concentrated on melting the frost layer, reducing heat loss and improving defrost efficiency. On the other hand, stopping the fan or running it in reverse at the lowest speed reduces the airflow speed, preventing unmelted frost from refreezing due to rapid cold air flow, ensuring continuous frost melting. Furthermore, running the fan in reverse at the lowest speed significantly reduces defrost energy consumption compared to high-speed operation, while also preventing a sudden drop in heat exchanger temperature due to high-speed fan operation, thus balancing the defrost process. Efficiency and energy consumption; on the other hand, when the target evaporation temperature corresponding to the heat exchanger is detected to be greater than or equal to the first preset temperature, the fan is controlled to reverse at the corresponding speed according to the temperature rise rate corresponding to the target evaporation temperature. This not only allows for real-time adjustment of the fan's reverse speed according to the actual changes in the target evaporation temperature of the heat exchanger, blowing away the frost layer on the heat exchanger fins, thus dynamically adapting to defrosting needs, optimizing heat exchange efficiency, and accelerating defrosting, but also prevents the heat exchanger temperature from becoming too high and causing component damage by dynamically adjusting the fan's reverse speed through the temperature rise rate. At the same time, it ensures stable pressure and temperature during the defrosting process, improving the safety of the equipment during defrosting.

[0044] In some possible embodiments, such as Figure 3 As shown, the process of controlling the fan to reverse its operation at the corresponding speed according to the temperature rise rate corresponding to the target evaporation temperature in S202 may include, but is not limited to: when the temperature rise rate corresponding to the target evaporation temperature is less than the first rate, controlling the fan to stop running or reverse its operation at the lowest speed; when the temperature rise rate corresponding to the target evaporation temperature is greater than or equal to the first rate and less than or equal to the second rate, controlling the fan to increase the first target value at the current speed and then reverse its operation; when the temperature rise rate corresponding to the target evaporation temperature is greater than the second rate, controlling the fan to increase the second target value at the current speed and then reverse its operation; the second rate (e.g., but not limited to 0.3, 0.5, etc.) is greater than the first rate (e.g., but not limited to 0.1, 0.2, etc.), the first rate is greater than 0; the second target value is greater than the first target value.

[0045] In defrost mode, when the rate of temperature rise at the target evaporation temperature is detected to be lower than the first rate (e.g., 0.1℃ / min), it indicates that the frost is melting slowly or the frost layer is thick. At this time, the controller will stop the fan or maintain the lowest speed in reverse. This reduces the heat exchange between the heat exchanger and the external environment, preventing defrosting heat from being lost to the outside. It also concentrates the heat from the high-temperature refrigerant discharged by the compressor on melting the frost layer, improving defrosting efficiency. Furthermore, the low-speed or stopped airflow prevents cold air from rapidly flowing over the unmelted frost layer, preventing the frost layer from refreezing due to a sudden drop in temperature, ensuring the defrosting process continues. It also avoids rapid temperature fluctuations in the heat exchanger caused by excessive speed, reducing fan energy consumption and balancing defrosting efficiency and energy costs.

[0046] When the temperature rise rate is between the first rate (e.g., 0.1℃ / min) and the second rate (e.g., 0.3℃ / min), it indicates that the frost layer has partially melted, and the melting speed is moderate. At this time, the controller controls the fan to increase the first target value (e.g., but not limited to 500 rpm) from the current speed (e.g., the minimum speed) and then reverse the operation. This can enhance air convection by moderately increasing the reverse speed, quickly blowing the melted water away from the heat exchanger surface, preventing residual water from refreezing in the low-temperature environment, and shortening the defrosting cycle. Furthermore, by increasing the reverse speed in stages, the fan operation status is matched with the frost melting progress, avoiding heat loss due to excessively high speed or defrosting delay due to excessively low speed.

[0047] When the temperature rise rate exceeds the second rate (e.g., 0.3℃ / min), the system determines that the frost layer has basically melted, and the melting speed is relatively fast. At this time, the controller controls the fan to increase the second target value (e.g., 1000 rpm, greater than the first target value) based on the current speed and then reverses the operation. This high-speed reverse operation generates a strong airflow, which can quickly remove residual moisture and frost fragments from the heat exchanger surface, avoiding secondary frost formation caused by moisture residue and further shortening the total defrosting time. It also enhances the heat exchanger's heat dissipation capacity by running at high speed in reverse, preventing excessive heat accumulation in the refrigerant after the frost melts, thus protecting equipment components (such as fins and pipes) from high-temperature damage. Furthermore, the strong airflow generated by the high-speed reverse operation cleans the heat exchanger surface, restoring its heat exchange performance and laying the foundation for switching back to heating mode after defrosting, ensuring that the unit quickly resumes normal operation.

[0048] Understandably, the air ducts of the aforementioned heat exchangers and / or fans are different, and the corresponding first and second speeds are also different.

[0049] For example, for heat exchangers with small fin spacing, the frost layer accumulates quickly and has a relatively dense structure. During defrosting, the melting rate of the frost layer varies greatly from the outer layer to the inner layer. In this case, the first rate can be set to a relatively low value (e.g., 0.1℃ / min) so that the fan can be started in time to reverse at low speed when the frost layer begins to loosen, gradually promoting melting. On the other hand, for heat exchangers with large fin spacing, the frost layer structure is looser and the heat transfer efficiency is higher. The overall melting rate of the frost layer is faster, so the first rate can be appropriately increased (e.g., 0.2℃ / min) to avoid starting the fan too early and wasting heat.

[0050] The design of the fan duct also affects the setting of the speed parameter. If the duct is a straight-through structure with low airflow resistance, the airflow will have a more direct effect on the frost layer when the fan reverses. In this case, the second speed can be set slightly higher (e.g., 0.35℃ / min) to ensure that the high-speed reverse rotation is performed only after the frost layer has fully melted. If the duct has many bends or obstructions, the airflow distribution will be uneven, and there may be local differences in the frost melting speed. In this case, the second speed needs to be appropriately reduced (e.g., 0.25℃ / min) to prevent misjudging the overall frost melting state due to excessively rapid local temperature rise.

[0051] Therefore, in practical applications, the specific values ​​of the first and second rates can be accurately determined through experimental testing and data analysis based on specific heat exchanger structural parameters (such as fin thickness, material, and arrangement) and the fluid dynamic characteristics of the fan duct (such as wind speed distribution and pressure loss) to ensure the adaptability and effectiveness of the defrosting control strategy.

[0052] The first and second target values ​​for the current speed increase can be set according to actual needs, but are not limited to these. For example, the first target value can be set to 500 rpm and the second target value to 1000 rpm. This stepped speed increase effectively blows away the defrost layer while avoiding the impact of sudden speed changes on the equipment. During execution, the controller collects the target evaporation temperature in real time and calculates the temperature rise rate per unit time using a built-in algorithm. It then compares this temperature rise rate with the preset first and second rates, triggering corresponding fan speed control commands to achieve intelligent and precise management of the entire defrosting process.

[0053] Optionally, the above-mentioned temperature rise rate It can be, but is not limited to: ;in, The number of temperature points detected; The time interval for sampling at different temperature points; This represents the target evaporation temperature of the heat exchanger. The temperature points mentioned above refer to discrete time points during the continuous acquisition of the target evaporation temperature of the heat exchanger during the defrosting process. The shorter the acquisition interval t corresponding to the value of n, the more accurate the temperature rise rate; conversely, the larger the acquisition interval t corresponding to the value of n, the further the temperature rise rate deviates from the actual value.

[0054] In some possible embodiments, the process of controlling the fan to reverse its operation at the corresponding speed according to the temperature rise rate corresponding to the target evaporation temperature in S202 may also include, but is not limited to: controlling the fan to reverse its operation at the corresponding target speed according to the target temperature rise rate range to which the temperature rise rate corresponding to the target evaporation temperature belongs, according to a preset correspondence; the preset correspondence represents the correspondence between each preset temperature rise rate range and each preset speed corresponding to the fan; the larger the temperature rate corresponding to the target temperature rise rate range, the higher the corresponding target speed.

[0055] Specifically, when the controller determines that the currently calculated temperature rise rate falls within a preset temperature rise rate range, it retrieves the target fan speed matching that range from a preset correspondence and sends a corresponding control signal to the fan drive module, causing the fan to immediately switch to that target speed for reverse operation. For example, if the preset temperature rise rate range is divided into a low-rate range (e.g., 0-2℃ / min), a medium-rate range (e.g., 2-5℃ / min), and a high-rate range (e.g., above 5℃ / min), and the preset correspondence sets the fan speed for the low-rate range to 1000 rpm, the medium-rate range to 1500 rpm, and the high-rate range to 2000 rpm, then when the real-time calculated temperature rise rate is 3℃ / min, which falls within the medium-rate range, the controller controls the fan to reverse at the target speed of 1500 rpm; if the temperature rise rate rises to 6℃ / min, entering the high-rate range, the fan speed is correspondingly increased to 2000 rpm. By dynamically adjusting the fan's reverse rotation speed according to the rate of temperature rise, the heat load requirements at different stages of the defrosting process can be matched more accurately. While ensuring defrosting efficiency, this method effectively avoids problems such as energy waste or incomplete defrosting caused by excessively high or low fan speeds.

[0056] In some possible embodiments, the aforementioned heat pump unit may also include, but is not limited to, temperature sensors and pressure sensors, used to collect temperature and pressure parameters in real time during the operation of the heat pump unit. The temperature sensor can be installed on the heat exchanger fins to monitor the evaporation temperature of the heat exchanger in real time, providing crucial information for the controller to determine the unit's operating status, perform defrosting control, and protect the unit's safety. The pressure sensor can be installed on the low-pressure side of the heat pump unit to detect the low-pressure side pressure.

[0057] The above defrosting control method may also include, but is not limited to, the following: controlling a temperature sensor to detect the evaporation temperature of the heat exchanger and obtaining the evaporation temperature detection value; controlling a pressure sensor to detect the low-pressure side pressure of the heat pump unit and obtaining the pressure detection value, and determining the corresponding saturation temperature of the heat pump unit based on the pressure detection value; and finally, determining the target evaporation temperature of the heat exchanger based on the evaporation temperature detection value and the saturation temperature.

[0058] Specifically, the controller compares and analyzes the real-time collected evaporation temperature readings with the saturation temperature calculated based on the low-pressure side pressure. For example, if the pressure sensor detects a low-pressure side pressure of 0.5 MPa (using R410A refrigerant as an example), the corresponding saturation temperature can be calculated as 5°C using a preset pressure-saturation temperature lookup table or calculation formula. If the temperature sensor detects an actual evaporation temperature of 3°C, the controller will set the target evaporation temperature to the minimum value between the actual evaporation temperature and the saturation temperature, such as 3°C. Setting the target evaporation temperature in this way more accurately reflects the actual operating status of the heat exchanger, providing a reliable basis for subsequent defrosting control. When the actual evaporation temperature is lower than the saturation temperature, it indicates that frost may have started to form on the heat exchanger surface. Setting the target evaporation temperature to the minimum of the two values ​​can trigger the defrosting procedure in a timely manner, preventing excessive frost from affecting heat exchange efficiency. If the actual evaporation temperature is higher than or equal to the saturation temperature, it indicates that the current heat exchange is good and defrosting is not required. This allows for precise control of the defrosting process, ensuring the stable and efficient operation of the heat pump unit while effectively avoiding unnecessary energy consumption.

[0059] In some possible embodiments, the above-described defrosting control method may also include, but is not limited to: When the target evaporation temperature is detected to be higher than the second preset temperature, or when the heat pump unit has been in defrost mode for a period of time that reaches the first preset time, or when the high-pressure side pressure of the heat pump unit is detected to be greater than the preset pressure, the heat pump unit is controlled to exit the defrost mode.

[0060] The second preset temperature can be dynamically adjusted according to the actual operating conditions of the heat pump unit and the ambient temperature. For example, in the summer or transitional season when the ambient temperature is high, the second preset temperature can be set to 5℃~8℃, while in the cold winter, it can be appropriately reduced to 2℃~4℃ to ensure that the frost on the surface of the heat exchanger can be accurately determined under different climatic conditions.

[0061] The setting of the first preset duration can take into account, but is not limited to, the shortest time required for defrosting and the energy waste caused by excessive defrosting. For example, but not limited to, it can be set to 5 minutes to 15 minutes. The specific duration can be determined by analyzing the experimental data of different models of heat pump units.

[0062] The preset pressure value is related to the rated operating pressure of the heat pump unit, for example, but not limited to, 60% to 80% of its high-pressure side design pressure. When the high-pressure side pressure exceeds this preset value, it indicates that the system may experience an abnormal pressure increase due to excessive defrosting. In this case, timely exiting the defrost mode can effectively protect the compressor and other components from damage. By comprehensively judging the above three conditions, precise control over the timing of exiting the defrost mode can be achieved, further improving the safety and economy of the heat pump unit's operation.

[0063] The process of controlling the heat pump unit to exit defrost mode may include, but is not limited to, the following: If the fan is running in reverse, the controller first reduces the fan speed to a stop to avoid airflow disturbance causing temperature fluctuations in the heat exchanger during switching. Simultaneously, the compressor operating frequency is reduced from the preset defrost frequency to the preset reversing frequency (e.g., but not limited to 20Hz~30Hz), and then the four-way valve is controlled to reverse, switching the heat pump unit from defrost mode (refrigeration cycle) back to heating mode, restoring the heating function of the indoor heat exchanger, and controlling the indoor fan to start forward operation, blowing the heat generated by the heat exchanger into the room, thus completing the mode switch. After the four-way valve reversal is complete, the compressor frequency is gradually increased from the preset reversing frequency to the normal heating frequency to ensure a stable rise in indoor temperature.

[0064] Please refer to the following. Figure 4 This is a flowchart illustrating another defrosting control method provided in an exemplary embodiment of this application. Figure 4 As shown, this defrosting control method may include, but is not limited to, the following steps: S401 When the heat pump unit meets the conditions for entering defrost, the current operating frequency of the compressor is reduced to the preset reversing frequency and the four-way valve is controlled to reverse so that the heat pump unit enters the defrost mode.

[0065] Specifically, such as Figure 5As shown, when the heat pump unit is detected to meet the defrosting conditions, the controller first adjusts the compressor's operating status. At this time, the compressor might originally be operating at its normal heating frequency Fx. To avoid excessive pressure surges and current fluctuations caused by high-frequency operation during the four-way valve switching, the controller drives the compressor to smoothly reduce its current operating frequency to a preset switching frequency. This preset switching frequency can be, but is not limited to, an experimentally verified safe frequency value, such as, but not limited to, between 20Hz and 30Hz. At this frequency, the compressor's output power and system pressure are relatively stable, providing a stable operating condition basis for the reliable switching of the four-way valve. After the compressor frequency decreases to the preset switching frequency and operates stably for a short period to ensure the system pressure tends to balance, the controller then sends a control signal to drive the four-way valve to perform the switching operation. The reversing action of the four-way valve changes the refrigerant circulation path of the heat pump unit. The high-temperature and high-pressure refrigerant that originally flowed to the indoor heat exchanger now flows to the outdoor heat exchanger. At this time, the outdoor heat exchanger, acting as a condenser, releases heat to melt the frost on its surface, thus enabling the heat pump unit to officially enter the defrosting mode.

[0066] Optionally, the defrosting conditions mentioned above may include, but are not limited to, a target evaporation temperature lower than a third preset temperature, or a target evaporation temperature lower than a third preset temperature for a duration equal to a second preset duration. The third preset temperature may be determined comprehensively based on factors such as the design parameters of different heat pump unit models, the operating ambient temperature range, and the refrigerant type, and may be, for example, but not limited to, a specific value between -5℃ and 2℃. To avoid false defrosting due to short-term fluctuations in the target evaporation temperature, and to ensure that defrosting is only triggered when frost has actually formed on the heat exchanger and the degree of frost has affected the unit's heating efficiency, the second preset duration may be, for example, but not limited to, 3 minutes to 10 minutes. When any of the above defrosting conditions are met, the controller initiates subsequent defrosting preparation processes such as compressor frequency reduction and four-way valve reversal.

[0067] S402, after the heat pump unit enters the defrost mode, the current operating frequency of the compressor is increased from the preset commutation frequency to the preset defrost frequency and then maintained at the preset defrost frequency for defrost operation.

[0068] Specifically, after the heat pump unit completes the four-way valve reversal and officially enters defrost mode, the compressor's operating frequency needs to be precisely controlled to ensure the efficiency and thoroughness of the defrosting process. The preset reversal frequency is the transition frequency maintained by the compressor during the four-way valve reversal. Its main function is to maintain relative stability of the system pressure at the moment of refrigerant flow switching, avoiding excessive pressure surges. The preset defrost frequency, on the other hand, is a higher operating frequency set comprehensively based on the heat load demand of the heat pump unit under defrost conditions, the estimated amount of frost on the outdoor heat exchanger, and the compressor's performance parameters. Increasing the compressor frequency from the preset reversal frequency to the preset defrost frequency (Fdf) significantly increases the refrigerant flow rate and heat release per unit time through the outdoor heat exchanger (which acts as a condenser). A higher refrigerant flow rate means more high-temperature, high-pressure refrigerant can quickly reach the outdoor heat exchanger and exchange heat with the frost layer on its surface; while greater heat release directly improves the defrosting rate and capacity, ensuring that the frost layer can be effectively melted and discharged in a shorter time. Once the preset defrosting frequency is reached, the system will control the compressor to run stably at that frequency for a period of time. The length of this period can be dynamically adjusted according to the actual frost conditions and defrosting effect to ensure sufficient defrosting while avoiding unnecessary energy consumption and indoor temperature fluctuations caused by excessive defrosting.

[0069] S403: After the heat pump unit enters the defrost mode, the control fan stops running or runs in reverse at the lowest speed.

[0070] Specifically, S403 is the same as S201, and will not be repeated here.

[0071] S404: When the target evaporation temperature corresponding to the heat exchanger is detected to be greater than or equal to the first preset temperature, the fan is controlled to reverse at the corresponding speed according to the temperature rise rate corresponding to the target evaporation temperature.

[0072] Specifically, S404 is the same as S202, and will not be repeated here.

[0073] For example, such as Figure 5 As shown, after the controller reduces the compressor's current operating frequency to the preset reversing frequency, it can first control the fan to stop running or run in reverse at the lowest speed. Then, based on the temperature rise rate corresponding to the target evaporation temperature, it controls the fan to gradually increase its speed and run in reverse. Here, -Wx represents the fan speed during reverse operation, and Wx represents the fan speed during forward operation.

[0074] Please refer to the following. Figure 6 This document provides a schematic diagram of a defrosting control device as an exemplary embodiment of this application. The defrosting control device is applied to a heat pump unit, which includes a heat exchanger and a fan; as shown below. Figure 6As shown, the defrosting control device 600 includes: The first control module 610 is used to control the above-mentioned fan to stop running or to run in reverse at the lowest speed after the above-mentioned heat pump unit enters the defrosting mode. The second control module 620 is used to control the fan to reverse its operation at the corresponding speed according to the temperature rise rate corresponding to the target evaporation temperature when the target evaporation temperature is detected to be greater than or equal to the first preset temperature.

[0075] In one possible implementation, the second control module 620 is specifically used for: When the temperature rise rate corresponding to the target evaporation temperature is less than the first rate, the fan is controlled to stop running or reverse at the lowest speed; when the temperature rise rate corresponding to the target evaporation temperature is greater than or equal to the first rate and less than or equal to the second rate, the fan is controlled to increase the first target value at the current speed and then reverse; the second rate is greater than the first rate, and the first rate is greater than 0; when the temperature rise rate corresponding to the target evaporation temperature is greater than the second rate, the fan is controlled to increase the second target value at the current speed and then reverse; the second target value is greater than the first target value.

[0076] In one possible implementation, the air ducts of the heat exchanger and / or the fan are different, and the corresponding first speed and second speed are also different.

[0077] In one possible implementation, the aforementioned temperature rise rate for: ;in, The number of temperature points detected; The time interval for sampling at different temperature points; This represents the target evaporation temperature corresponding to the heat exchanger mentioned above.

[0078] In one possible implementation, the aforementioned heat pump unit further includes a temperature sensor and a pressure sensor; the aforementioned defrost control device 600 further includes: The third control module is used to control the temperature sensor to detect the evaporation temperature of the heat exchanger and obtain the evaporation temperature detection value. The fourth control module is used to control the pressure sensor to detect the low-pressure side pressure of the heat pump unit and obtain the pressure detection value. The first determining module is used to determine the saturation temperature corresponding to the heat pump unit based on the pressure detection value. The second determining module is used to determine the target evaporation temperature corresponding to the heat exchanger based on the above-mentioned evaporation temperature detection value and the above-mentioned saturation temperature.

[0079] In one possible implementation, the defrosting control device 600 further includes: The fifth control module is used to control the heat pump unit to exit the defrost mode when the target evaporation temperature is detected to be higher than the second preset temperature, or when the duration of the heat pump unit in defrost mode reaches the first preset duration, or when the high-pressure side pressure of the heat pump unit is detected to be greater than the preset pressure.

[0080] In one possible implementation, the aforementioned heat pump unit further includes a compressor and a four-way valve; the aforementioned defrost control device 600 further includes: The sixth control module is used to reduce the current operating frequency of the compressor to a preset reversing frequency and control the four-way valve to reverse when the heat pump unit meets the conditions for entering defrost mode. The seventh control module is used to increase the current operating frequency of the compressor from the preset reversing frequency to the preset defrosting frequency after the heat pump unit enters the defrosting mode, and then maintain the preset defrosting frequency for defrosting operation.

[0081] In one possible implementation, the above-mentioned defrosting conditions include the target evaporation temperature being lower than a third preset temperature, or the target evaporation temperature being lower than the third preset temperature and the duration of the lower temperature reaching a second preset duration.

[0082] The division of modules in the defrost control device described above is for illustrative purposes only. In other embodiments, the defrost control device can be divided into different modules as needed to complete all or part of the functions of the defrost control device. The implementation of each module in the defrost control device provided in the embodiments of this specification can be in the form of a computer program. This computer program can run on a heat pump unit or air conditioner. The program modules constituted by this computer program can be stored in the memory of the heat pump unit or air conditioner. When the computer program is executed by a processor, it implements all or part of the steps of the defrost control method described in the embodiments of this specification.

[0083] Please see below. Figure 7 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Figure 7 As shown, the electronic device 700 may include: at least one processor 710, at least one network interface 720, user interface 730, memory 740, at least one communication bus 750, and heat pump unit 760.

[0084] The communication bus 750 is used to enable communication between these components.

[0085] The network interface 720 may include, but is not limited to, a Bluetooth Low Energy module, a Near Field Communication (NFC) module, a Wireless Fidelity (Wi-Fi) module, etc.

[0086] The user interface 730 may include a display screen and buttons. key Optionally, the user interface 730 may also include a standard wired interface and a wireless interface.

[0087] The heat pump unit 760 includes a heat exchanger and a fan.

[0088] The processor 710 may include one or more processing cores. The processor 710 connects to various parts within the electronic device 700 using various interfaces and lines, and performs various functions and processes data by running or executing instructions, programs, code sets, or instruction sets stored in the memory 740, and by calling data stored in the memory 740. Optionally, the processor 710 may be implemented using at least one hardware form of Digital Signal Processing (DSP), Field-Programmable Gate Array (FPGA), or Programmable Logic Array (PLA). The processor 710 may integrate one or a combination of several of the following: Central Processing Unit (CPU), Graphics Processing Unit (GPU), and modem. The CPU primarily handles the operating system, user interface, and applications; the GPU is responsible for rendering and drawing the content required for display; and the modem handles wireless communication. It is understood that the modem may also be implemented as a separate chip without being integrated into the processor 710.

[0089] The memory 740 may include random access memory (RAM) or read-only memory (ROM). Optionally, the memory 740 may include a non-transitory computer-readable storage medium. The memory 740 can be used to store instructions, programs, code, code sets, or instruction sets. The memory 740 may include a program storage area and a data storage area, wherein the program storage area may store instructions for implementing an operating system, instructions for at least one function (such as exiting the defrost control function, defrost control function, etc.), instructions for implementing the above-described method embodiments, etc.; the data storage area may store data involved in the above-described method embodiments, etc. Optionally, the memory 740 may also be at least one storage device located remotely from the aforementioned processor 710. Figure 7 As shown, the memory 740, which serves as a computer storage medium, may include an operating system, a network communication module, a user interface module, and program instructions.

[0090] exist Figure 7 In the illustrated electronic device 700, the user interface 730 is mainly used to provide an input interface for the user and to acquire user input data; while the processor 710 can be used to call program instructions stored in the memory 740 and specifically perform the following operations: After the heat pump unit enters the defrost mode, the fan is controlled to stop running or run in reverse at the lowest speed. When the target evaporation temperature corresponding to the heat exchanger is detected to be greater than or equal to the first preset temperature, the fan is controlled to run in reverse at the corresponding speed according to the temperature rise rate corresponding to the target evaporation temperature.

[0091] In some possible embodiments, the processor 710, when executing the above-mentioned control of the fan to reverse its rotation speed according to the temperature rise rate corresponding to the target evaporation temperature, specifically performs the following: When the temperature rise rate corresponding to the target evaporation temperature is less than the first rate, the fan is controlled to stop running or reverse at the lowest speed; when the temperature rise rate corresponding to the target evaporation temperature is greater than or equal to the first rate and less than or equal to the second rate, the fan is controlled to increase the first target value at the current speed and then reverse; the second rate is greater than the first rate, and the first rate is greater than 0; when the temperature rise rate corresponding to the target evaporation temperature is greater than the second rate, the fan is controlled to increase the second target value at the current speed and then reverse; the second target value is greater than the first target value.

[0092] In some possible embodiments, the air ducts of the heat exchanger and / or the fan are different, and the corresponding first speed and second speed are also different.

[0093] In some possible embodiments, the above-mentioned temperature rise rate for: ;in, The number of temperature points detected; The sampling time intervals corresponding to different temperature points; This represents the target evaporation temperature corresponding to the heat exchanger mentioned above.

[0094] In some possible embodiments, the heat pump unit further includes a temperature sensor and a pressure sensor; the processor 710 is also used to perform: The temperature sensor is controlled to detect the evaporation temperature of the heat exchanger and obtain the evaporation temperature detection value; the pressure sensor is controlled to detect the low-pressure side pressure of the heat pump unit and obtain the pressure detection value; the saturation temperature of the heat pump unit is determined based on the pressure detection value; and the target evaporation temperature of the heat exchanger is determined based on the evaporation temperature detection value and the saturation temperature.

[0095] In some possible embodiments, the processor 710 described above is also used to perform: When the target evaporation temperature is detected to be higher than the second preset temperature, or when the duration of the heat pump unit in defrost mode reaches the first preset duration, or when the high-pressure side pressure of the heat pump unit is detected to be greater than the preset pressure, the heat pump unit is controlled to exit the defrost mode.

[0096] In some possible embodiments, the heat pump unit further includes a compressor and a four-way valve; the processor 710 is also configured to: when the heat pump unit meets the conditions for entering defrost, reduce the current operating frequency of the compressor to a preset reversing frequency and then control the four-way valve to reversing, so that the heat pump unit enters the defrost mode; after the heat pump unit enters the defrost mode, increase the current operating frequency of the compressor from the preset reversing frequency to a preset defrost frequency and then maintain the preset defrost frequency for defrost operation.

[0097] In some possible embodiments, the above-mentioned defrosting conditions include the target evaporation temperature being lower than a third preset temperature, or the target evaporation temperature being lower than the third preset temperature and the duration of the lower temperature reaching a second preset duration.

[0098] This application also provides a computer storage medium storing instructions that, when executed on a computer or processor, cause the computer or processor to perform one or more steps of any of the above methods. If the constituent modules of the above-described defrosting control device are implemented as software functional units and sold or used as independent products, they can be stored in the aforementioned storage medium.

[0099] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted through the computer-readable storage medium. The computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium accessible to a computer or a data storage device such as a server or data center that integrates one or more available media. The available media may be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., digital versatile discs (DVDs)), or semiconductor media (e.g., solid-state disks (SSDs)).

[0100] 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. This program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the methods described above. The aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks. Unless otherwise specified, the technical features of this embodiment and its implementation can be combined arbitrarily.

[0101] The embodiments described above are merely preferred embodiments of this application and are not intended to limit the scope of this application. Any modifications and improvements made by those skilled in the art to the technical solutions of this application without departing from the spirit of this application should fall within the protection scope defined by the claims of this application.

Claims

1. A defrosting control method, characterized in that, Applied to a heat pump unit, the heat pump unit including a heat exchanger and a fan; the method includes: After the heat pump unit enters the defrost mode, the fan is controlled to stop running or to run in reverse at the lowest speed. When the target evaporation temperature corresponding to the heat exchanger is detected to be greater than or equal to the first preset temperature, the fan is controlled to reverse its operation at the corresponding speed according to the temperature rise rate corresponding to the target evaporation temperature.

2. The method as described in claim 1, characterized in that, The step of controlling the fan to reverse its operation at a corresponding speed based on the temperature rise rate corresponding to the target evaporation temperature includes: When the temperature rise rate corresponding to the target evaporation temperature is less than the first rate, the fan is controlled to stop running or to reverse at the lowest speed. When the temperature rise rate corresponding to the target evaporation temperature is greater than or equal to the first rate and less than or equal to the second rate, the fan is controlled to increase the first target value at the current speed and then reverse to run; the second rate is greater than the first rate, and the first rate is greater than 0. When the rate of temperature rise corresponding to the target evaporation temperature is greater than the second rate, the fan is controlled to increase the second target value at the current speed and then reverse to run; the second target value is greater than the first target value.

3. The method as described in claim 2, characterized in that, The first speed and the second speed are different depending on the air duct of the heat exchanger and / or the fan.

4. The method as described in claim 2, characterized in that, The rate of temperature rise for: ;in, The number of temperature points detected; The time interval for sampling at different temperature points; The target evaporation temperature corresponds to the heat exchanger.

5. The method as described in claim 4, characterized in that, The heat pump unit further includes a temperature sensor and a pressure sensor; the method further includes: The temperature sensor is controlled to detect the evaporation temperature of the heat exchanger, and the evaporation temperature detection value is obtained; The pressure sensor is controlled to detect the low-pressure side pressure of the heat pump unit and obtain the pressure detection value; The saturation temperature of the heat pump unit is determined based on the pressure detection value. The target evaporation temperature of the heat exchanger is determined based on the detected evaporation temperature and the saturation temperature.

6. The method as described in claim 1, characterized in that, The method further includes: When the target evaporation temperature is detected to be higher than the second preset temperature, or when the heat pump unit has been in defrost mode for a duration of a first preset duration, or when the high-pressure side pressure of the heat pump unit is detected to be greater than the preset pressure, the heat pump unit is controlled to exit the defrost mode.

7. The method as described in claim 1, characterized in that, The heat pump unit further includes a compressor and a four-way valve; the method further includes: When the heat pump unit meets the conditions for entering defrost, the current operating frequency of the compressor is reduced to the preset reversing frequency and the four-way valve is controlled to reverse, so that the heat pump unit enters the defrost mode. After the heat pump unit enters the defrost mode, the current operating frequency of the compressor is increased from the preset commutation frequency to the preset defrost frequency and then maintained at the preset defrost frequency for defrost operation.

8. The method as described in claim 7, characterized in that, The defrosting conditions include the target evaporation temperature being lower than a third preset temperature, or the target evaporation temperature being lower than the third preset temperature and the duration of the lower temperature reaching a second preset duration.

9. A defrosting control device, characterized in that, Applied to a heat pump unit, the heat pump unit including a heat exchanger and a fan; the device includes: The first control module is used to control the fan to stop running or to run in reverse at the lowest speed after the heat pump unit enters the defrosting mode; The second control module is used to control the fan to reverse its operation at the corresponding speed according to the temperature rise rate corresponding to the target evaporation temperature when the target evaporation temperature is detected to be greater than or equal to the first preset temperature.

10. An electronic device, characterized in that, include: Processor and memory; The processor is connected to the memory; The memory is used to store executable program code; The processor runs a program corresponding to the executable program code stored in the memory to perform the steps of the method as described in any one of claims 1-8.

11. A computer storage medium, characterized in that, The computer storage medium stores a plurality of instructions adapted for loading by a processor and executing the steps of the method as described in any one of claims 1-8.

12. A computer program product comprising instructions that, when run on a computer or processor, cause the computer or processor to perform the steps of the method as claimed in any one of claims 1-8.

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