Refrigeration apparatus and defrosting control method thereof

Abstract

This application belongs to the field of refrigeration equipment technology, and provides a refrigeration equipment and its defrosting control method. The refrigeration equipment includes: a cabinet with compartments; a compressor, an evaporator, and a controller disposed within the cabinet; the controller is configured to: acquire operating parameters of the refrigeration equipment, including ambient humidity and the pressure change rate at the return gas end of the compressor; determine the equivalent frost thickness of the evaporator based on the ambient humidity and the pressure change rate at the return gas end, wherein the equivalent frost thickness is used to characterize the physical deposition degree of frost on the evaporator surface; compare the equivalent frost thickness with a preset thickness threshold to determine the current frost level of the evaporator; and control the refrigeration equipment to adaptively execute a defrosting mode that matches the current frost level.

Description

Technical Field

[0001] This application belongs to the field of refrigeration equipment technology, and more specifically, relates to a refrigeration device and its defrosting control method. Background Technology

[0002] Currently, refrigeration equipment such as upright refrigerators, beverage cabinets, and air curtain cabinets are commonly used facilities in supermarkets, convenience stores, and fresh food retail industries. Evaporator frosting is a key issue that restricts the operating efficiency and reliability of refrigeration equipment.

[0003] However, existing defrosting technologies all have inherent defects that are difficult to overcome. For example, timed defrosting uses fixed cycle control, which cannot adapt to changes in operating conditions such as ambient humidity and door opening frequency, and is prone to over-defrosting or under-defrosting; for another example, electric heating defrosting consumes too much energy as a percentage of the total energy consumption of the machine, and the temperature fluctuation during the defrosting process is large, which can easily lead to the spoilage of temperature-sensitive foods; for yet another example, simple shutdown defrosting is not thorough, and the melted frost water is prone to re-freezing in the gaps between the evaporator fins, forming ice blockage. Summary of the Invention

[0004] The purpose of this application is to provide a refrigeration device and its defrosting control method, which aims to solve the problem that existing defrosting control technology cannot balance defrosting effect and energy consumption level, and is difficult to meet the intelligent operation requirements of refrigeration equipment.

[0005] In a first aspect, a refrigeration device is provided, the refrigeration device comprising: a housing having compartments; a compressor, an evaporator, and a controller disposed within the housing; the controller being configured to: Obtain the operating parameters of the refrigeration equipment, including ambient humidity and the pressure change rate at the return gas end of the compressor; Based on the ambient humidity and the pressure change rate at the return gas end, the equivalent thickness of the frost layer on the evaporator is determined, wherein the equivalent thickness of the frost layer is used to characterize the degree of physical deposition of the frost layer on the surface of the evaporator. The current frosting level of the evaporator is determined by comparing the equivalent thickness of the frost layer with a preset thickness threshold. The refrigeration equipment is controlled to adaptively execute a defrosting mode that matches the current frost level.

[0006] The refrigeration equipment provided in this embodiment can accurately predict the frost thickness of the evaporator and accurately determine the frost level by acquiring operating parameters such as ambient humidity and compressor return gas pressure change rate. By adaptively executing a graded defrosting mode that matches the frost level, it solves the problems of insufficient defrosting, excessive defrosting, high energy consumption, and large temperature fluctuations that exist in traditional timed defrosting and electric heating defrosting. Furthermore, this embodiment does not require additional electric heating devices. It can achieve efficient defrosting, reduce defrosting energy consumption, significantly extend the service life of the compressor, and improve the operating performance of the refrigeration equipment and the user experience simply by intelligently controlling the existing components.

[0007] Secondly, a defrosting control method for a refrigeration device is provided, the method comprising: Obtain the operating parameters of the refrigeration equipment, including ambient humidity and the pressure change rate at the return gas end of the compressor; Based on the ambient humidity and the pressure change rate at the return gas end, the equivalent thickness of the frost layer on the evaporator of the refrigeration equipment is determined, wherein the equivalent thickness of the frost layer is used to characterize the physical deposition degree of the frost layer adhering to the surface of the evaporator; The current frosting level of the evaporator is determined by comparing the equivalent thickness of the frost layer with a preset thickness threshold. The refrigeration equipment is controlled to adaptively execute a defrosting mode that matches the current frost level.

[0008] Thirdly, an electronic device is provided, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the electronic device performs the method as described in any one of the above.

[0009] Fourthly, a computer-readable storage medium is provided, which stores a computer program that, when executed by a processor, implements the method as described in any one of the above.

[0010] Fifthly, a computer program product is provided that, when run on an electronic device, causes the electronic device to perform the method of any one of the first aspects above.

[0011] It is understood that the beneficial effects of the second to fifth aspects mentioned above can be found in the relevant descriptions in the first aspect mentioned above, and will not be repeated here.

[0012] The beneficial effects of the embodiments in this application compared with the prior art are: Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art 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.

[0013] Figure 1 This is a schematic block diagram of a refrigeration device provided in an embodiment of this application; Figure 2 This is a schematic flowchart of a defrosting control method for a refrigeration device provided in an embodiment of this application; Figure 3 This is a schematic flowchart of a defrosting control method for a refrigeration device provided in an embodiment of this application; Figure 4 This is a schematic flowchart of a defrosting control method for a refrigeration device provided in an embodiment of this application; Figure 5 This is a schematic flowchart of a defrosting control method for a refrigeration device provided in an embodiment of this application; Figure 6 This is a schematic diagram of the defrosting control device for a refrigeration equipment provided in an embodiment of this application; Figure 7 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0014] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0015] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0016] It should also be understood that, in the description of this application, unless otherwise stated, the " / " used in the specification and appended claims indicates that the related objects are in an "or" relationship. For example, A / B can mean A or B. The "and / or" in this application is merely a description of the relationship between the related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0017] Furthermore, to facilitate a clear description of the technical solutions in the embodiments of this application, the terms "first" and "second" are used in the embodiments of this application to distinguish identical or similar items with essentially the same function and effect. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, but are only used for distinguishing descriptions, and the terms "first" and "second" do not necessarily imply that they are different, nor should they be construed as indicating or implying relative importance.

[0018] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."

[0019] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0020] First, some terms used in the embodiments of this application will be explained to facilitate understanding by those skilled in the art.

[0021] Pressure change rate at the return gas end: refers to the change in gas pressure in the compressor return gas pipeline per unit time. It is mainly reflected in the pressure decay rate and can reflect the change in ventilation resistance caused by frost layer blocking the evaporator air duct. It is an operating parameter for judging the frost growth state.

[0022] Equivalent frost thickness: A calculated value used to quantitatively characterize the overall degree of frost deposition on the evaporator surface. It is obtained by combining the pressure change rate and ambient humidity, and can objectively reflect the degree of influence of frost on the heat exchange efficiency and airflow effect of the evaporator.

[0023] Preset thickness threshold: The critical thickness value is pre-calibrated and stored in the controller based on the refrigeration equipment model, evaporator structure, and operating conditions. It serves as the criterion for classifying different frost levels.

[0024] Frost level: Frost status levels are divided according to different threshold ranges of the equivalent thickness of the frost layer. They are used to distinguish different degrees of frost on the evaporator, such as light, medium and heavy, and serve as the basis for selecting differentiated defrosting strategies.

[0025] Defrosting mode: The controller is configured with a set of control logic for different frost levels. It realizes defrosting operation by adjusting the operating status of the compressor and fan components. Different defrosting modes are distinguished from each other in terms of operating intensity and execution form, and are matched with the frost level one by one.

[0026] The above is a brief introduction to the terms used in the embodiments of this application, and will not be repeated below.

[0027] This application provides an example of a refrigeration device; please refer to... Figure 1 As shown, Figure 1 A schematic structural diagram of a refrigeration device provided in this application is shown. It is provided as an example and not as a limitation. The refrigeration device includes: a housing with compartments; a compressor 101, an evaporator 102, and a controller 103 disposed within the housing.

[0028] Please refer to Figure 2 As shown, Figure 2 A schematic structural diagram of a defrosting control method for a refrigeration device provided in this application is shown. The controller is configured to perform the following method steps: S201, Obtain the operating parameters of the refrigeration equipment, including ambient humidity and the pressure change rate at the return gas end of the compressor.

[0029] S202, based on the ambient humidity and the pressure change rate at the return gas end, determine the equivalent thickness of the frost layer on the evaporator, wherein the equivalent thickness of the frost layer is used to characterize the physical deposition degree of the frost layer adhering to the evaporator surface.

[0030] S203, compare the equivalent thickness of the frost layer with the preset thickness threshold to determine the current frost level of the evaporator.

[0031] S204 controls the refrigeration equipment to adaptively execute a defrosting mode that matches the current frost level.

[0032] In some embodiments, the refrigeration equipment can be household refrigeration equipment or commercial refrigeration equipment. For example, the refrigeration equipment can specifically be a refrigerator, freezer, upright refrigerator, beverage cabinet, air curtain cabinet, island cabinet, cooked food cabinet, fresh meat cabinet, etc.

[0033] Please refer to Figure 1 As shown, the refrigeration equipment includes a compressor, an evaporator, and a controller. The controller is electrically connected to the compressor, a temperature sensor installed on the evaporator, a pressure sensor installed on the compressor's return gas line, and an ambient temperature and humidity sensor located at the air inlet of the refrigeration equipment. It can receive the operating parameters collected by each sensor and send corresponding control commands to the compressor.

[0034] In some embodiments, to achieve defrosting control of the refrigeration equipment, the controller is responsible for running a preset control program and coordinating the various components to complete the entire adaptive defrosting process. For example, the controller integrates a computing unit and a storage unit. The storage unit is used to store preset parameter correspondences, thickness thresholds, and control logic, while the computing unit is used to process and calculate the collected operating parameters to generate corresponding control commands.

[0035] In some embodiments, the controller acquires operating parameters of the refrigeration equipment, specifically including ambient humidity and the pressure change rate at the compressor return end. Ambient humidity is collected in real time by a temperature and humidity sensor at the air inlet, accurately reflecting the humidity status of the air entering the evaporator duct. Air humidity is a key factor affecting the rate and density of frost formation.

[0036] In some embodiments, the pressure change rate at the compressor return gas end is continuously collected and calculated by a pressure sensor on the return gas pipeline. Frost formation on the evaporator surface leads to increased ventilation resistance and reduced airflow, which in turn causes a decrease in compressor return gas pressure. The pressure change rate can directly reflect the growth rate and accumulation degree of the frost layer. In addition to the above parameters, the controller can also simultaneously collect operating parameters such as the frequency of door magnetic switches and the cabinet load rate, further improving the comprehensiveness and accuracy of frost status judgment.

[0037] In some embodiments, the controller determines the equivalent frost thickness of the evaporator based on ambient humidity and the rate of change of pressure at the return gas end. It should be understood that the equivalent frost thickness characterizes the degree of physical deposition of frost on the evaporator surface, and the value of the equivalent frost thickness is positively correlated with the degree of influence of the frost on the evaporator's heat exchange efficiency.

[0038] In some embodiments, the controller first calculates the initial frost thickness based on a pre-calibrated correspondence between pressure attenuation rate and frost thickness; then, an ambient humidity weighting coefficient is introduced to correct the initial frost thickness to obtain the final equivalent frost thickness.

[0039] It should be understood that the environmental humidity weighting coefficient is introduced because the structure and density of frost layers formed under different humidity conditions are significantly different. The actual frost layer thickness corresponding to the same pressure decay rate is different. Humidity correction can effectively eliminate the interference of environmental factors on the prediction results and control the prediction error of frost layer thickness within a small range.

[0040] In some embodiments, the controller compares the calculated equivalent frost thickness with multiple preset thickness thresholds to determine the current frost level of the evaporator. The preset thickness thresholds are pre-calibrated and stored in the controller's storage unit based on the refrigeration capacity of the refrigeration equipment, the usage scenario, and food storage requirements, and can be adjusted according to actual usage.

[0041] For example, taking a preset thickness threshold including a first thickness threshold and a second thickness threshold as an example, when the equivalent thickness of the frost layer is less than the first thickness threshold, it is determined to be light frost; when the equivalent thickness of the frost layer is greater than or equal to the first thickness threshold and less than the second thickness threshold, it is determined to be moderate frost; and when the equivalent thickness of the frost layer is greater than or equal to the second thickness threshold, it is determined to be heavy frost. This multi-frost level classification method can accurately match different degrees of frost conditions.

[0042] In some embodiments, the controller adaptively executes a defrosting mode that matches the current frosting level based on the determined current frosting level. Different defrosting modes correspond to different control logics for the compressor and fan components, which can minimize defrosting energy consumption and cabinet temperature fluctuations while ensuring defrosting effectiveness. When the frost is determined to be mild, the controller operates in a non-stop micro-defrost mode. This mode reduces the compressor's operating frequency and adjusts the fan speed, utilizing the compressor's exhaust heat and air circulation to melt a small amount of frost without interrupting cooling and having almost no impact on the cabinet's temperature. When the frost is determined to be moderate, the controller operates in a short-stop defrost mode. This mode stops the compressor and keeps the fan running at a low speed, relying on the residual heat in the evaporator and refrigeration system to defrost. Once the preset defrost completion conditions are met, cooling is immediately resumed. When the frost is determined to be severe, the controller operates in an intermittent water-locking defrost mode. This mode alternates between stopping defrost and strong cooling to lock in water. When the frost melts but has not yet dripped in large quantities, strong cooling is activated to quickly lock and freeze the undried free frost at the base of the evaporator fins, blocking the water flow path and preventing the free water from refreezing and forming ice blockage after defrosting. The water then melts and is discharged naturally during subsequent normal cooling cycles.

[0043] In some embodiments, the controller can simultaneously activate a dynamic temperature compensation mechanism while executing any defrosting mode. During a preset time period before the defrosting program begins, the controller controls the compressor to operate at full load in advance, lowering the cabinet temperature to 1 to 2 degrees Celsius below the set temperature to achieve pre-cooling and energy storage, which is used to offset the temperature rise during the defrosting process. During defrosting, the controller dynamically adjusts the fan speed based on the real-time temperature inside the cabinet, optimizing the distribution of cold air and further suppressing temperature fluctuations. Through this dynamic temperature compensation mechanism, the temperature fluctuation inside the cabinet during defrosting can be stably controlled within ±1 degree Celsius, effectively ensuring the quality and safety of refrigerated food.

[0044] The refrigeration equipment provided in this embodiment achieves accurate prediction of evaporator frost thickness and precise determination of frost level by integrating operating parameters such as ambient humidity and compressor return gas pressure change rate. By adaptively executing a graded defrosting mode that matches the frost level, it solves the problems of insufficient defrosting, excessive defrosting, high energy consumption, and large temperature fluctuations that exist in traditional timed defrosting and electric heating defrosting. Without the need for additional electric heating devices, efficient defrosting can be achieved simply through intelligent control of existing components, which can reduce overall defrosting energy consumption by 20% to 30%, significantly extend the service life of the compressor, and improve the operating performance of the refrigeration equipment and the user experience.

[0045] In some embodiments, the pressure change rate at the return gas end includes the pressure decay rate, which characterizes the pressure drop at the return gas end per unit time. The controller determines the equivalent frost thickness of the evaporator based on the ambient humidity and the pressure change rate at the return gas end; please refer to [reference needed]. Figure 3 As shown, Figure 3 A schematic structural diagram of a defrosting control method for a refrigeration device provided in this application is shown, specifically configured as follows: S301, the initial frost thickness of the frost layer on the surface of the evaporator is calculated based on the pressure decay rate.

[0046] S302, based on the deviation of the ambient humidity from the preset reference humidity, a humidity weighted correction coefficient is obtained, wherein the humidity weighted correction coefficient increases non-linearly with the increase of the deviation value.

[0047] S303, the humidity weighted correction coefficient and the initial frost layer thickness are nonlinearly corrected to obtain the equivalent frost layer thickness.

[0048] In some embodiments, the pressure change rate at the return gas end specifically includes the pressure decay rate, which is used to characterize the pressure drop at the compressor return gas end per unit time and is a physical indicator that directly reflects the growth rate and accumulation degree of frost on the evaporator surface.

[0049] For example, the pressure decay rate is obtained by the controller through continuous acquisition of real-time pressure data from the pressure sensor on the compressor's return gas line, and by calculating the ratio of the pressure difference between adjacent sampling times to the sampling time interval. The controller can use a sliding window filter to smooth the calculated pressure decay rate, removing interference from instantaneous operating condition fluctuations such as compressor start-up and shutdown, and door opening and closing, ensuring that the pressure decay rate truly reflects the natural growth state of the frost layer.

[0050] The controller calculates the initial frost thickness on the evaporator surface based on the pressure decay rate. This initial frost thickness is a fundamental value derived from the inherent physical relationship between evaporator frost formation and return gas pressure, and it is positively correlated with the pressure decay rate. This correlation is obtained through extensive calibration experiments on evaporators of different models and heat exchange areas under standard operating conditions and is pre-stored in the controller's storage unit in the form of a mapping table or a polynomial fitting function. The controller then substitutes the real-time calculated pressure decay rate into the pre-stored mapping relationship to quickly obtain the corresponding initial frost thickness.

[0051] The controller calculates a humidity-weighted correction coefficient based on the deviation of the ambient humidity from a preset reference humidity. It should be understood that the preset reference humidity is a pre-calibrated ambient humidity value corresponding to standard frosting conditions, which can be set as the humidity condition where the evaporator's frosting characteristics are most stable. The deviation of the ambient humidity from the preset reference humidity is the difference between the real-time collected ambient humidity and the preset reference humidity, used to characterize the degree to which the current ambient humidity deviates from standard operating conditions.

[0052] It should be noted that the humidity-weighted correction coefficient increases non-linearly with the increase of the deviation value. This is because ambient humidity has a significant non-linear physical effect on the structure and density of the frost layer: when the ambient humidity is higher than the reference humidity, the frost layer grows faster, and the frost layer structure is more porous, resulting in a larger actual frost layer thickness corresponding to the same pressure decay rate; when the ambient humidity is lower than the reference humidity, the frost layer grows slower, and the frost layer structure is more dense and rigid, resulting in a smaller actual frost layer thickness corresponding to the same pressure decay rate. This scheme uses a linear fitting correction formula (e.g., equivalent frost layer thickness H' = initial frost layer thickness H × (1 + ambient relative humidity RH)). (60%)×0.008, where 60% is the preset reference humidity) to achieve high-precision, low-computing-power real-time correction, adapting to the controller's fast calculation requirements; for extreme working conditions where the humidity deviation exceeds the preset range, the controller can automatically switch to the pre-calibrated nonlinear correction function to correct the initial frost layer thickness, further improving the prediction accuracy.

[0053] It should be understood that the controller performs a nonlinear correction on the humidity-weighted correction coefficient and the initial frost thickness to obtain the final equivalent frost thickness. For most operating conditions, a linear correction using multiplication is sufficient to meet the accuracy requirements; this method is simple, efficient, and suitable for real-time operation. For extreme conditions where the humidity deviation exceeds the preset range, the controller can automatically switch to a pre-calibrated nonlinear correction function to correct the initial frost thickness, further improving prediction accuracy. The equivalent frost thickness comprehensively considers the physical laws of frost growth and the influence of ambient humidity, accurately characterizing the actual physical deposition degree of frost on the evaporator surface and its impact on the evaporator's heat exchange efficiency.

[0054] For example, if the preset reference humidity is set to 60% relative humidity, when the real-time ambient humidity is 80%, the deviation from the reference humidity is 20%, and the corresponding humidity weighting correction factor is 1.3; when the real-time ambient humidity is 40%, the deviation from the reference humidity is -20%, and the corresponding humidity weighting correction factor is 0.8. If the calculated initial frost layer thickness is 2 mm, when the ambient humidity is 80%, the final equivalent frost layer thickness is 2 × 1.3 = 2.6 mm; when the ambient humidity is 40%, the final equivalent frost layer thickness is 2 × 0.8 = 1.6 mm.

[0055] In this embodiment, by introducing the pressure decay rate as an indicator for calculating frost thickness and combining it with environmental humidity for nonlinear weighted correction, the interference of environmental factors on the frost thickness prediction results is effectively eliminated, and the prediction error of frost thickness is controlled within 5%, providing reliable basic data support for the accurate execution of subsequent graded defrosting strategies.

[0056] In some embodiments, the preset thickness threshold includes a first preset threshold and a second preset threshold, and the first preset threshold is less than the second preset threshold; please refer to Figure 4 As shown, Figure 4 This invention provides a schematic structural diagram of a defrosting control method for a refrigeration device. The controller compares the equivalent thickness of the frost layer with a preset thickness threshold to determine the current frost level of the evaporator. Specifically, it is configured as follows: S401, if the equivalent thickness of the frost layer is less than the first preset threshold, then the current frost level is determined to be the first frost level.

[0057] S402, if the equivalent thickness of the frost layer is greater than or equal to the first preset threshold and less than the second preset threshold, then the current frost level is determined to be the second frost level.

[0058] S403, if the equivalent thickness of the frost layer is greater than or equal to the second preset threshold, then the current frost level is determined to be the third frost level.

[0059] In some embodiments, the preset thickness threshold includes a first preset threshold and a second preset threshold, with the first preset threshold being less than the second preset threshold. The preset thickness threshold is a pre-calibrated critical thickness value stored in the controller's storage unit, used to classify the evaporator's frosting state into different levels. Its calibration is based on a comprehensive consideration of the refrigeration capacity of the refrigeration equipment, the evaporator's heat exchange area, the food storage temperature requirements inside the cabinet, and the optimal balance between defrosting energy consumption and defrosting effect. Different models of refrigeration equipment and different usage scenarios can be set with different preset thickness thresholds, and the thresholds can be adjusted during later use based on actual operating conditions to adapt to different environmental conditions and usage habits.

[0060] In some embodiments, the controller compares the calculated equivalent frost thickness with a first preset threshold and a second preset threshold sequentially, and determines the current frost level of the evaporator based on the comparison results. If the equivalent frost thickness is less than the first preset threshold, the current frost level is determined to be the first frost level. The first frost level corresponds to a light frost state, where only a very thin frost layer adheres to the evaporator surface. The frost layer has minimal impact on the heat exchange efficiency of the evaporator, does not cause a significant decrease in cooling performance, and does not significantly increase the operating load of the compressor. The temperature inside the cabinet can be stably maintained within the set range.

[0061] In some embodiments, if the equivalent thickness of the frost layer is greater than or equal to a first preset threshold and less than a second preset threshold, the current frost level is determined to be the second frost level. The second frost level corresponds to a moderate frost state, at which point the frost layer has accumulated to a certain thickness, beginning to obstruct airflow in the evaporator, resulting in a perceptible decrease in heat exchange efficiency, an increase in the compressor's operating load, and slight fluctuations in the cabinet temperature. Moderate defrosting is required to prevent further frost thickening and its impact on the cooling effect.

[0062] In some embodiments, if the equivalent thickness of the frost layer is greater than or equal to a second preset threshold, the current frost level is determined to be the third frost level. The third frost level corresponds to a severe frost condition, at which point a thick layer of frost adheres to the evaporator surface, severely clogging the evaporator fin gaps, significantly increasing airflow resistance, significantly reducing heat exchange efficiency, causing the compressor to operate under high load for extended periods, resulting in a sharp increase in energy consumption and intensified temperature fluctuations inside the cabinet. If defrosting is not performed in time, it may lead to food spoilage inside the cabinet or even cause compressor overload damage.

[0063] For example, for commercial upright refrigerators, the first preset threshold can be set to 1 mm, 1.5 mm, etc., and the second preset threshold can be set to 3 mm, 3.5 mm, etc. When the equivalent thickness of the frost layer is 0.8 mm, it is determined to be the first frost level; when the equivalent thickness of the frost layer is 2 mm, it is determined to be the second frost level; and when the equivalent thickness of the frost layer is 4 mm, it is determined to be the third frost level.

[0064] In this embodiment, by setting two preset thickness thresholds, the frost state of the evaporator is divided into three clear levels, which can accurately match different degrees of frost conditions. This avoids the shortcomings of traditional single defrosting strategies that cannot adapt to complex frost states. It provides an accurate and reliable basis for subsequent execution of differentiated adaptive defrosting modes, and can minimize unnecessary defrosting operations while ensuring sufficient defrosting, thereby reducing defrosting energy consumption and cabinet temperature fluctuations.

[0065] In some embodiments, the defrosting modes include a first defrosting mode, a second defrosting mode, and a third defrosting mode, respectively corresponding to a first defrosting level, a second defrosting level, and a third defrosting level; and the intensity of the first defrosting mode, the second defrosting mode, and the third defrosting mode increases sequentially. A fan assembly is also installed inside the refrigeration equipment housing; please refer to... Figure 5 As shown, Figure 5 This invention provides a schematic structural diagram of a defrosting control method for a refrigeration device. The controller controls the refrigeration device to adaptively execute a defrosting mode that matches the current frosting level. Specifically, the method is configured as follows: S501 If the current frosting level is the first frosting level, control the refrigeration equipment to execute the first defrosting mode. In the first defrosting mode, reduce the operating frequency of the compressor and the fan assembly runs at the first speed to keep the refrigeration cycle uninterrupted.

[0066] S502, if the current frosting level is the second frosting level, control the refrigeration equipment to execute the second defrosting mode. In the second defrosting mode, the power supply to the compressor is cut off and the fan assembly is controlled to operate at a second speed lower than the first speed. After the preset first defrosting time, the refrigeration is restarted.

[0067] S503 If the current frosting level is the third frosting level, the refrigeration equipment is controlled to execute the third defrosting mode. In the third defrosting mode, the shutdown defrosting stage and the strong cooling water-locking stage are executed alternately according to the preset cycle.

[0068] The shutdown defrosting stage is configured to: cut off the power supply to the compressor and use the heat of the air inside the casing to melt the frost layer on the evaporator surface; the strong cooling and water locking stage is configured to: restore the power supply to the compressor and run it at maximum load to cool and freeze the free water on the evaporator surface to block its migration path.

[0069] In some embodiments, the defrosting modes include a first defrosting mode, a second defrosting mode, and a third defrosting mode, each corresponding to a different frosting level, with the intensity of the defrosting mode increasing as the frosting level rises. The intensity of the defrosting mode comprehensively reflects the energy consumption level of the defrosting process, the degree of interruption to the refrigeration cycle, and the degree of impact on the internal temperature of the cabinet. This progressively increasing intensity design ensures that different levels of frosting can be addressed in a targeted manner, avoiding both the continuous accumulation of frost due to insufficient defrosting and the energy waste and drastic fluctuations in the internal temperature caused by excessive defrosting.

[0070] In some embodiments, if the controller determines that the current frosting level is the first frosting level, it controls the refrigeration equipment to execute the first defrosting mode. The first defrosting mode is a non-stop micro-defrosting mode, suitable for light frosting conditions where the frost layer is extremely thin and has minimal impact on refrigeration performance. In the first defrosting mode, the controller reduces the operating frequency of the compressor while controlling the fan assembly to operate at the first speed, maintaining uninterrupted refrigeration cycle throughout the process. Reducing the compressor operating frequency reduces the evaporator's cooling output, causing the evaporator surface temperature to rise appropriately, utilizing the waste heat from the compressor exhaust and the heat from the air circulation inside the cabinet to achieve a small amount of frost melting; maintaining the fan assembly at the first speed ensures normal air circulation inside the cabinet and maintains a stable temperature inside the cabinet.

[0071] This defrosting mode does not require interrupting the cooling process, has almost no impact on the temperature inside the cabinet, and consumes very little energy. It can promptly remove the thin frost that forms initially without affecting food storage, preventing the frost layer from thickening further and entering a moderate frost state.

[0072] In some embodiments, if the controller determines that the current frosting level is the second frosting level, it controls the refrigeration equipment to execute a second defrosting mode. The second defrosting mode is a short-stop defrosting mode, suitable for moderate frosting conditions where the frost layer has accumulated to a certain thickness and requires moderate defrosting. In the second defrosting mode, the controller cuts off the compressor's power supply, stops the refrigeration cycle, and simultaneously controls the fan assembly to operate at a second speed lower than the first speed. After a preset first defrosting time, the compressor is restarted to resume refrigeration. After the compressor's power supply is cut off, the evaporator surface temperature gradually rises, relying on the residual heat in the evaporator and refrigeration system, as well as the sensible heat of the air inside the cabinet, to melt the frost layer. The fan assembly operating at a lower second speed promotes heat exchange between the air inside the cabinet and the evaporator, accelerating the defrosting speed and preventing excessive temperature fluctuations inside the cabinet. The preset first defrosting time is pre-calibrated based on the refrigeration capacity of the refrigeration equipment and the maximum thickness of the moderate frost, ensuring that the moderate frost can completely melt within this time, preventing excessive temperature increases inside the cabinet due to prolonged defrosting time.

[0073] In some embodiments, if the controller determines that the current frosting level is the third frosting level, it controls the refrigeration equipment to execute the third defrosting mode. The third defrosting mode is an intermittent water-locking defrosting mode, which is suitable for severe frosting conditions where the frost layer is thick and has seriously affected the refrigeration performance. In the third defrosting mode, the controller alternately executes the shutdown defrosting stage and the strong cooling water-locking stage according to a preset cycle until defrosting is completed.

[0074] The shutdown defrosting phase is configured as follows: the controller cuts off the power supply to the compressor, stopping the refrigeration cycle, while the fan assembly operates at low speed, utilizing the sensible heat of the air inside the cabinet and the residual heat of the refrigeration system to melt the frost layer on the evaporator surface. During the shutdown defrosting phase, the frost layer gradually changes from a solid to a liquid state, forming free water that adheres to the evaporator surface.

[0075] The forced cooling and water-locking stage is configured as follows: the controller restores the compressor's power supply and controls the compressor to operate at maximum load, while the fan assembly maintains high-speed operation, lowering the evaporator surface temperature below freezing. At this time, any free water on the evaporator surface that has not yet dripped will be frozen at the base of the evaporator fins, blocking its migration path into the evaporator interior or cabinet, preventing the free water from refreezing and forming ice blockage after defrosting. The forced cooling and water-locking stage is short in duration, only requiring the freezing of free water on the evaporator surface, and will not cause excessive temperature drops inside the cabinet.

[0076] This intermittent water-locking defrosting mode melts a large amount of frost in batches and guides it to the water collection tray for discharge through the alternating cycle of defrosting and water locking. This solves the problem of a large amount of frost water melting at the same time, dripping easily and freezing again during the traditional continuous shutdown defrosting process, and ensures the thoroughness of defrosting in the case of heavy frost.

[0077] For example, in the first defrosting mode, the compressor operating frequency can be reduced from the normal 50Hz to 30Hz, and the first speed of the fan assembly is set to 1200 rpm; in the second defrosting mode, the second speed of the fan assembly is set to 600 rpm, and the preset first defrosting time is set to 8 minutes; in the third defrosting mode, the preset cycle can be set to 5 minutes, of which the shutdown defrosting stage lasts for 4 minutes, the strong cooling and water locking stage lasts for 1 minute, and the cycle is repeated for 3 to 5 times until defrosting is completed.

[0078] In this embodiment, by setting defrosting modes with increasing intensity corresponding to three different frost levels, a precise match between defrosting intensity and frost severity is achieved. The first defrosting mode removes initial thin frost without interrupting refrigeration; the second defrosting mode efficiently handles moderate frost and controls temperature fluctuations; and the third defrosting mode solves the problem of secondary icing caused by severe frost through an intermittent water-locking mechanism. The entire defrosting process requires no additional electric heating device; efficient defrosting is achieved solely through intelligent control of the compressor and fan components. While ensuring thorough defrosting, it significantly reduces defrosting energy consumption, keeps internal temperature fluctuations within a minimal range, effectively protects the quality and safety of refrigerated food, and extends the service life of the refrigeration equipment.

[0079] In some embodiments, the operating parameter also includes the storage temperature inside the enclosure, which is the air temperature at the geometric center of the enclosure; please refer to Figure 4 As shown, Figure 4 A schematic structural diagram of a defrosting control method for a refrigeration device provided in this application is shown. The controller is further configured to: Before executing the second or third defrost mode, control the refrigeration system of the refrigeration equipment to operate at maximum load, and reduce the storage temperature inside the cabinet to below the set target temperature to reserve cold capacity. During the process of the refrigeration equipment adaptively executing a defrosting mode with matching intensity, the storage temperature inside the cabinet is monitored in real time. If the storage temperature inside the chamber is higher than the sum of the set target temperature and the preset positive deviation, increase the current speed of the fan assembly to maintain the storage temperature inside the chamber within the preset temperature range. If the storage temperature inside the chamber is lower than the difference between the set target temperature and the preset negative deviation, reduce the current speed of the fan assembly to maintain the storage temperature inside the chamber within the preset temperature range.

[0080] In some embodiments, the operating parameters of the refrigeration equipment acquired by the controller also include the storage temperature inside the cabinet. The storage temperature inside the cabinet is collected in real time by multiple temperature sensors evenly distributed in the storage space of the refrigeration equipment. It can accurately reflect the average temperature status of different areas inside the cabinet and is the core basis for dynamic temperature compensation control. During the entire process of executing the aforementioned second or third defrosting mode, the controller simultaneously activates the dynamic temperature compensation mechanism. This mechanism is divided into a pre-cooling energy storage stage before defrosting and a dynamic speed adjustment stage of the fan components during defrosting, which is used to offset the temperature rise during defrosting and maintain the stability of the storage temperature inside the cabinet.

[0081] In some embodiments, before executing the second or third defrost mode, the controller controls the refrigeration system of the refrigeration equipment to operate at maximum load, lowering the storage temperature inside the cabinet to below the set target temperature to reserve cold energy. Since both the second and third defrost modes require interrupting compressor operation and stopping evaporator cooling, the temperature inside the cabinet will inevitably rise. Pre-cooling stores excess cold energy in the air, food, and inner liner before defrosting begins, offsetting the heat input during the defrosting process and suppressing the temperature rise. The duration of pre-cooling and the target temperature drop are dynamically adjusted according to the current frosting level; the higher the frosting level, the longer the defrosting duration, the greater the temperature rise, and the longer the corresponding pre-cooling time and target temperature drop. After pre-cooling is complete, the controller immediately starts the corresponding defrost mode to avoid unnecessary loss of cold energy after pre-cooling.

[0082] In some embodiments, during the adaptive execution of a defrosting mode with matching intensity by the refrigeration equipment, the controller continuously monitors the storage temperature inside the cabinet in real time and dynamically adjusts the current speed of the fan assembly based on the deviation between the storage temperature inside the cabinet and the set target temperature. The controller pre-stores the set target temperature and the corresponding preset positive and negative deviations, which together constitute the allowable temperature fluctuation range inside the cabinet. If the storage temperature inside the cabinet is higher than the sum of the set target temperature and the preset positive deviation, it indicates that the temperature inside the cabinet is rising too quickly. The controller increases the current speed of the fan assembly to accelerate the air circulation speed inside the cabinet, evenly distribute the residual cold energy throughout the cabinet, and promote heat exchange between the melted frost on the evaporator surface and the air, thus slowing down the rate of temperature rise. If the storage temperature inside the cabinet is lower than the difference between the set target temperature and the preset negative deviation, it indicates that the temperature inside the cabinet is dropping too quickly, and the frost may not be melting fast enough. The controller reduces the current speed of the fan assembly to reduce heat exchange between the air and the evaporator, ensuring that the frost can melt sufficiently, while avoiding excessive temperature drop inside the cabinet that could affect food storage. The adjustment range of the fan component speed is positively correlated with the magnitude of the temperature deviation. The greater the temperature deviation, the greater the speed adjustment range, thus achieving precise closed-loop control of the storage temperature inside the chamber.

[0083] For example, for a commercial upright refrigerator, the target temperature is set to 4℃, with a preset positive deviation of 1℃ and a preset negative deviation of 1℃, allowing a temperature fluctuation range of 3℃ to 5℃. Before executing the second defrost mode, the controller controls the compressor to run at maximum load for 8 minutes to lower the storage temperature inside the cabinet to 2.5℃ to complete pre-cooling and energy storage. During the defrost process, when the storage temperature inside the cabinet rises to 5.2℃, the controller increases the fan speed from 600 rpm to 900 rpm; when the storage temperature inside the cabinet drops to 2.8℃, the controller reduces the fan speed from 600 rpm to 400 rpm, ensuring that the storage temperature inside the cabinet remains stable within the preset temperature range.

[0084] In this embodiment, a dynamic temperature compensation mechanism combining pre-cooling energy storage before defrosting and dynamic speed regulation of the fan components during the defrosting process effectively solves the problem of drastic temperature fluctuations inside the cabinet during traditional shutdown defrosting. This mechanism requires no additional hardware; simply by controlling the timing and speed of the compressor and fan components, it can stably control the temperature fluctuations inside the cabinet within ±1℃ during the defrosting process. This is far superior to the 5℃ to 8℃ temperature fluctuations of traditional electric heating defrosting, improving the storage safety of refrigerated food while ensuring the thoroughness and efficiency of the defrosting process.

[0085] In some embodiments, the controller is further configured to control the compressor to continue running at the current operating frequency for a first preset duration before executing the second or third defrost mode in order to balance the internal pressure of the refrigeration system.

[0086] In some embodiments, the controller, upon determining the need to execute a second or third defrost mode, is specifically configured to control the compressor to continue running at its current operating frequency for a first preset duration after completing pre-cooling energy storage and before formally cutting off the compressor's power supply, in order to balance the internal pressure of the refrigeration system. Both the second and third defrost modes require interrupting compressor operation. If the power supply is directly cut off during compressor operation, a significant pressure difference will exist between the high-pressure and low-pressure sides of the refrigeration system. At this time, the piston and crankshaft inside the compressor will be subjected to a huge reverse impact force, which will not only lead to excessive starting current and increased energy consumption when the compressor restarts, but also accelerate the wear of the moving parts inside the compressor, severely shortening the compressor's service life.

[0087] In some embodiments, during the first preset duration of operation, the compressor continues to operate at the current frequency, and the refrigerant in the refrigeration system continues to flow under the influence of the pressure difference. The high-pressure refrigerant on the high-pressure side gradually flows to the low-pressure side through the throttling device, causing the pressure on the high-pressure side of the system to gradually decrease and the pressure on the low-pressure side to gradually increase, ultimately achieving a basic pressure balance within the entire refrigeration system. The first preset duration is pre-calibrated based on parameters such as the capacity of the refrigeration system, the length of the pipeline, and the amount of refrigerant charged. It can be set to 10 to 30 seconds, ensuring that the refrigeration system of most commercial refrigeration equipment completes pressure balance within this duration, while preventing unnecessary increases in the cabinet temperature due to excessive waiting time.

[0088] For example, for a commercial upright refrigerator with a cooling capacity of 500W, the first preset duration can be set to 15 seconds. When the controller determines that the second defrosting mode needs to be executed, it first controls the compressor to continue running at the current 50Hz operating frequency for 15 seconds. After the high and low pressures of the refrigeration system are basically balanced, the power supply to the compressor is cut off, and the subsequent defrosting process is started.

[0089] In this embodiment, by adding a system pressure balancing stage before defrosting starts, the pressure difference between the high and low pressure sides of the refrigeration system is effectively eliminated, significantly reducing the starting current and mechanical shock when the compressor restarts. The starting current of the compressor can be reduced by more than 40%, which can effectively extend the service life of the compressor, while reducing energy consumption during the start-up process and improving the stability and reliability of the refrigeration system operation.

[0090] In some embodiments, the controller is also configured to: acquire the operating parameters of the refrigeration equipment in real time during the defrosting mode; if it is determined that the operating parameters have reached the preset defrosting completion conditions, control the refrigeration equipment to automatically exit defrosting and resume normal refrigeration cycle.

[0091] In this embodiment, the controller can continuously collect various operating parameters of the refrigeration equipment in real time during the execution of any defrosting mode. Based on the real-time operating data, the defrosting process is dynamically monitored to determine whether the defrosting operation is complete. In this embodiment, the operating parameters used by the controller to determine defrosting completion include not only humidity and pressure parameters, but also the evaporator surface temperature and the cumulative defrosting time. This multi-dimensional parameter collaborative determination comprehensively covers the evaporator defrosting state, the system's steady-state operation, and the defrosting timing boundaries, effectively avoiding misjudgments and omissions caused by single-parameter determination, thereby improving the reliability of the defrosting exit logic.

[0092] For example, the surface temperature of the evaporator can be collected in real time by temperature sensors placed at the evaporator fins, which can intuitively reflect the phase change melting state of the frost layer and determine whether the frost layer has completely melted; the defrosting cumulative time is the cumulative running time obtained by the controller from the moment the defrosting mode is started, which is used to avoid the defrosting process running indefinitely due to extreme operating conditions or sensor malfunctions; the compressor return gas pressure change rate is used to determine whether the evaporator duct resistance has returned to normal and whether the system heat exchange condition has returned to steady state.

[0093] In some embodiments, the controller has preset standardized defrosting completion conditions. This application adopts multi-condition independent judgment logic. If any preset defrosting completion condition is met, the defrosting operation can be determined to be completed. The controller will then immediately control the refrigeration equipment to automatically exit the current defrosting mode and return to the normal refrigeration cycle operation state.

[0094] The first defrosting condition is that the evaporator surface temperature rises to the preset defrosting termination temperature. Once the frost layer on the evaporator surface has completely melted, the solid frost phase change and heat absorption process ceases, and the evaporator surface temperature will continue to rise steadily. When the temperature reaches the preset defrosting termination temperature, it proves that the frost and residual ice on the evaporator surface have completely melted. Based on the calibration conditions of this scheme, the preset defrosting termination temperature is preferably set to 9℃. This temperature ensures that thick frost and residual ice in the corners completely melt, leaving no frost residue, while also preventing unnecessary and ineffective temperature rise.

[0095] The second defrosting condition is that the rate of change of return gas pressure decreases and remains at a preset pressure threshold. After the frost layer has completely melted, the evaporator fin air duct is unobstructed, the ventilation resistance returns to the factory steady-state level, the compressor return gas pressure no longer shows a continuous decline, and the pressure change rate tends to stabilize. In this embodiment, the preset pressure threshold is 0.05 kPa / min. When the controller detects that the pressure decline rate is consistently and stably lower than this threshold, it determines that the evaporator ventilation and heat exchange status has been fully restored, and the defrosting operation is complete.

[0096] The third defrosting completion condition is that the cumulative defrosting time reaches the preset maximum allowable time. This condition serves as a fallback protection logic for the entire unit's control. For the intermittent water-locking defrosting mode corresponding to severe frosting, the preset maximum allowable defrosting time is 35 minutes. Regardless of whether the temperature and pressure parameters meet the judgment criteria, as long as the cumulative defrosting time reaches the upper limit threshold, the controller will forcibly end the defrosting process and resume cooling. This effectively addresses special abnormal conditions such as sensor malfunctions, extreme high humidity frosting, and frequent door openings, preventing excessive temperature rise inside the cabinet, abnormal increase in energy consumption, and loss of control of the entire unit caused by defrosting timeout.

[0097] The controller can adapt to different judgment priorities for different types of defrosting modes. For the non-stop micro-melting mode corresponding to mild frosting, the steady-state pressure condition can be used as the priority judgment; for moderate short-term shutdown defrosting and severe intermittent water-locking defrosting modes, the steady-state temperature condition is the priority judgment basis, and the duration condition is used as the final protection.

[0098] This embodiment employs a multi-parameter, multi-condition parallel defrosting completion determination mechanism, completely abandoning the traditional fixed-duration, one-size-fits-all defrosting control method. It can dynamically adapt the defrosting end time according to the actual defrosting progress of the evaporator. This ensures thorough defrosting without residue or secondary icing risks under various frosting conditions, while minimizing ineffective defrosting time, reducing energy consumption and cabinet temperature fluctuations caused by defrosting, and further improving the accuracy, stability, and intelligence of adaptive defrosting control in commercial refrigeration equipment.

[0099] In some embodiments, the operating parameters also include the evaporator surface temperature and the cumulative defrosting time; the preset defrosting completion conditions include any of the following: The surface temperature of the evaporator rises to the preset defrosting termination temperature; The rate of change of return gas pressure decreases and remains at the preset pressure threshold; The cumulative defrosting time has reached the preset maximum allowable time.

[0100] During the defrosting mode, the controller collects the following operating parameters for the refrigeration equipment: the surface temperature of the evaporator and the cumulative defrosting time. The evaporator surface temperature directly reflects the frost melting process and the temperature rise after complete defrosting. The cumulative defrosting time is used to limit the longest operating range of a single defrosting process, avoiding indefinite delays in the defrosting process under abnormal conditions.

[0101] In some embodiments, the preset defrosting completion conditions are set to allow any one of multiple conditions to trigger the exit logic, covering three types of situations: temperature determination, pressure steady-state determination, and duration fallback determination, to adapt to the defrosting completion recognition requirements under different working conditions.

[0102] When the surface temperature of the evaporator rises to the preset defrosting termination temperature, the defrosting process can be considered complete. After the frost layer attached to the evaporator surface has completely melted, there is no longer a phase change heat absorption process, and the evaporator temperature will rise steadily. This preset defrosting termination temperature has been calibrated under the overall operating conditions and can reliably indicate that the frost layer has completely melted. It is the most intuitive basis for determining whether defrosting is complete.

[0103] When the rate of change of compressor return gas pressure decreases and remains at the preset pressure threshold, defrosting can also be considered complete. After the frost layer has completely melted, the ventilation resistance of the evaporator duct returns to its initial steady state, the return gas pressure no longer shows significant decay or fluctuation, and the rate of change of pressure tends to stabilize and remain within the threshold range. This can be used to confirm that defrosting has been completed from the perspective of system operating conditions.

[0104] When the cumulative defrosting time reaches the preset maximum allowable time, defrosting is forcibly completed and the system enters the normal refrigeration cycle, regardless of whether the temperature and pressure parameters meet the standards. This condition serves as a fallback protection logic to handle special situations such as sensor malfunctions and extreme environmental conditions, preventing prolonged stagnation of the defrosting process from causing a continuous rise in cabinet temperature and unnecessary energy consumption, thus ensuring the safe operation of the entire unit and the closed-loop control logic.

[0105] This embodiment sets three parallel defrosting completion judgment conditions: temperature, pressure, and duration. It takes into account both accurate identification of normal operating conditions and fallback protection for abnormal operating conditions. It can accurately capture the real defrosting state by relying on physical parameters, and avoid program jamming and operating condition loss by relying on duration thresholds. This improves the reliability, robustness, and environmental adaptability of the overall adaptive defrosting control of the refrigeration equipment.

[0106] In some embodiments, the refrigerator operating parameters collected by the controller also include the comprehensive heat load inside the refrigerator. The comprehensive heat load inside the refrigerator can comprehensively reflect the total amount of storage, storage type and environmental heat intrusion. The size of the heat load will directly affect the evaporator frosting rate, the temperature change during the defrosting process and the cooling capacity consumption. Incorporating it into the operating parameter system can further enrich the data dimensions of the controller and make the defrosting control logic more in line with the actual operating conditions of the refrigerator.

[0107] In some embodiments, the controller can determine the overall heat load inside the refrigerator by at least one of the following methods: compressor operating current, input power, and images of the items stored inside the refrigerator. The compressor operating current and input power directly reflect the load status of the refrigeration system. The higher the heat load inside the refrigerator, the greater the cooling capacity required by the refrigeration system, and the higher the compressor operating current and real-time input power will be. The controller pre-stores a model of the correspondence between current, power, and heat load. This model is obtained through whole-machine calibration under different storage conditions. After collecting the compressor's real-time operating current or input power, the controller can calculate the current overall heat load value inside the refrigerator by referring to the correspondence model.

[0108] In some embodiments, when determining the heat load using images of the storage compartments, an image acquisition component is installed inside the refrigerator cabinet. This component is electrically connected to the controller, continuously acquiring images of the storage area and transmitting them to the controller. The controller integrates image analysis logic, which can identify the stacking volume, density, and coverage area of ​​items within the cabinet. Combined with preset heat load parameters per unit volume, the overall heat load within the entire cabinet is calculated. This method is unaffected by fluctuations in electrical parameters and can still stably complete heat load detection even under special operating conditions such as low-frequency compressor operation and intermittent start-stop cycles.

[0109] For example, the controller can dynamically adjust the defrosting strategy parameters based on the detected comprehensive heat load inside the enclosure. When the comprehensive heat load inside the enclosure is high, the pre-cooling time can be extended appropriately, the pre-cooling temperature drop can be increased, and the upper limit of the fan component speed during the defrosting process can be increased. When the comprehensive heat load inside the enclosure is low, the pre-cooling time can be shortened appropriately to further reduce defrosting energy consumption.

[0110] In some embodiments, any detection method can be selected individually or in combination during practical applications. For example, the compressor operating current and images of the stored items in the chamber can be collected simultaneously, and the heat load results obtained from the two sets of data can be cross-checked and corrected. This effectively avoids the judgment bias caused by sensor failure or sudden changes in operating conditions due to a single detection method, and improves the accuracy of the comprehensive heat load detection results inside the chamber.

[0111] In this embodiment, the comprehensive heat load inside the refrigerator is effectively identified through diversified detection methods. The controller can combine the frost status, environmental conditions and load inside the refrigerator to comprehensively adjust the defrosting strategy, making the defrosting timing, defrosting intensity and temperature compensation actions more targeted, further optimizing the overall operating efficiency of the refrigerator, reducing energy waste and continuously ensuring that the storage temperature inside the refrigerator is in a stable state.

[0112] The following provides a complete and detailed implementation method for the defrosting control method provided in this application: For example, the controller collects operating parameters such as compressor return gas pressure and ambient relative humidity in real time, and collects and calculates the pressure decay rate at fixed time intervals. The pressure decay rate is used to characterize the decrease in compressor return gas pressure per unit time. Specifically, the pressure decay rate K is equal to the difference between the initial return gas pressure and the current return gas pressure divided by the collection time interval. In this embodiment, the preferred collection time interval is 10 minutes. The continuous thickening of the frost layer on the evaporator surface directly causes a decrease in evaporator heat exchange efficiency and an increase in airflow resistance, corresponding to a continuously accelerating rate of decrease in compressor return gas pressure. The value of the pressure decay rate can truly reflect the degree of frost growth on the evaporator.

[0113] Based on the calculated pressure decay rate, the controller substitutes it into a preset calibration formula to calculate the initial frost layer equivalent thickness. In this embodiment, a linear fitting formula H=a×K+b is used, where the calibration coefficient a is 0.12 and b is 0.3, and the thickness unit is millimeters. This formula can quickly and stably obtain the initial frost layer thickness value that matches the pressure decay characteristics.

[0114] To eliminate the interference of ambient humidity on the frosting state and improve the accuracy of thickness calculation, the controller introduces ambient humidity weighted correction logic to optimize the initial frost layer thickness. Higher ambient humidity leads to faster frost formation and more significant frost accumulation on the evaporator; therefore, a humidity correction formula is set: H' = H × (1 + (RH)) / (RH) 60%)×0.008), where RH is the real-time ambient relative humidity and 60% is the preset reference humidity. This nonlinear correction method can adapt to the differences in frost density and growth under different humidity conditions, and obtain the final accurate equivalent thickness of the frost layer.

[0115] This embodiment presets two thickness thresholds to divide three levels of frost formation. The judgment criteria are clear and specific: when the corrected equivalent thickness of the frost layer is less than 1.5 mm, it is judged as light frost (first level of frost); when the equivalent thickness of the frost layer is greater than or equal to 1.5 mm and less than 3.0 mm, it is judged as moderate frost (second level of frost); when the equivalent thickness of the frost layer is greater than or equal to 3.0 mm, it is judged as heavy frost (third level of frost). Each frost level is matched with a corresponding exclusive defrosting control strategy to achieve precise matching between defrosting intensity and frost degree.

[0116] When the condition is determined to be light frost (Level 1 frost), the controller operates in a non-stop micro-frost defrosting mode, ensuring uninterrupted refrigeration of the equipment throughout the entire process. For example, the specific control logic involves reducing the compressor's operating frequency from 60Hz to 40Hz, while simultaneously reducing the fan unit's operating speed from 80% to 45%, running continuously for 15 to 25 minutes. By reducing the refrigeration output and weakening the evaporator's cooling intensity, the system's residual heat and air circulation within the cabinet allow for slow melting of the thin frost. In this mode, temperature fluctuations within the cabinet can be controlled within 0.6℃, with no sudden temperature changes throughout the process. This effectively removes the initial thin frost without affecting the quality of stored items, preventing the continuous accumulation of frost.

[0117] When moderate frost (second frost level) is detected, the controller briefly shuts down to defrost mode. Before formal defrosting begins, the controller pre-cools the refrigeration system to full load, lowering the cabinet temperature to 1°C below the set temperature to pre-cool and store sufficient cooling capacity to offset the temperature rise during defrosting. After pre-cooling, the compressor power output is cut off, stopping the refrigeration cycle. Simultaneously, the fan assembly is controlled to run continuously at 30% low speed, utilizing the heat of the air inside the cabinet and the residual heat of the evaporator to melt the frost layer. The standardized defrosting time is controlled between 8 and 12 minutes. When the evaporator temperature is detected to rise to 8°C or 9°C, defrosting is considered complete, and the compressor is immediately restarted to resume normal cooling. Under this condition, the overall temperature fluctuation inside the cabinet does not exceed 0.9°C, resulting in efficient defrosting and stable temperature control.

[0118] When the system is determined to have severe frost (Level 3), the controller uses an intermittent water-locking defrosting mode. This abandons the traditional continuous shutdown defrosting method and adopts a control logic that alternates between shutdown defrosting and strong cooling water-locking. This gradually breaks down the thick frost layer, completely resolving the problems of secondary icing and ice blockage after the frost melts. Each cycle is set to activate the strong cooling water-locking stage after 5 minutes of shutdown defrosting. During the shutdown defrosting stage, the compressor is shut off, and natural heat exchange melts the thick frost on the evaporator surface. During the strong cooling water-locking stage, the compressor is activated at a high frequency of 65Hz, and the fan assembly maintains 50% speed, rapidly reducing the evaporator temperature and instantly freezing and fixing the melted free frost water, blocking the water flow path. The entire system cycles 2 to 4 times, with a total defrosting time controlled between 18 and 30 minutes, effectively eliminating severe frost.

[0119] In this embodiment, during the execution of medium and heavy defrosting modes, pre-cooling energy storage can be activated 10 minutes before defrosting to reduce the cabinet temperature by 0.8℃ to 1.2℃ to store cold energy. During the defrosting process, the cabinet temperature is monitored in real time and the fan assembly speed is dynamically adjusted. When the cabinet temperature is 0.7℃ higher than the set temperature, the fan assembly speed is increased to 75% to accelerate air circulation and balance the cold energy. When the cabinet temperature is 0.5℃ lower than the set temperature, the fan assembly speed is decreased to 35% to reduce heat exchange loss. Throughout the process, the cabinet temperature fluctuation can be stably controlled within ±1℃.

[0120] This embodiment employs a multi-condition redundant defrosting completion determination logic. Defrosting is deemed complete upon meeting any one of the conditions, and the controller automatically exits defrosting mode and resumes normal refrigeration cycle. This effectively adapts to different operating conditions and avoids the risk of failure due to a single determination. For example, specific determination conditions include one of the following: the evaporator surface temperature rises to 9°C or higher; the pressure decay rate remains below 0.05 kPa / min for 3 consecutive minutes, and the system's ventilation and heat exchange status returns to a steady state; or the cumulative defrosting time under heavy frosting conditions reaches the maximum limit of 35 minutes, triggering forced exit protection.

[0121] This embodiment eliminates the need for additional electric heating defrosting components. It relies entirely on algorithm optimization and coordinated control of all components to achieve graded adaptive intelligent defrosting. This effectively solves the shortcomings of traditional timed defrosting, such as low accuracy, high energy consumption of electric heating defrosting, and easy re-icing during shutdown defrosting. It also has the advantages of energy saving, stable temperature control, thorough defrosting, and high reliability, making it suitable for the long-term stable operation requirements of various commercial refrigeration equipment.

[0122] This application provides an example of a defrosting control method for a refrigeration device. This is an example, not a limitation, and the method can be applied to or operated in the refrigeration device described above, which includes a compressor, fan assembly, evaporator, and controller. See above for further details. Figure 2 The flowchart illustrating the defrosting control method for the refrigeration equipment is provided for understanding. This method includes: Obtain the operating parameters of the refrigeration equipment, including ambient humidity and the rate of change of pressure at the return gas end of the compressor; Based on the ambient humidity and the pressure change rate at the return gas end, the equivalent thickness of the frost layer on the evaporator of the refrigeration equipment is determined. The equivalent thickness of the frost layer is used to characterize the physical deposition degree of the frost layer on the evaporator surface. The current frosting level of the evaporator is determined by comparing the equivalent thickness of the frost layer with the preset thickness threshold. The refrigeration equipment is controlled to adaptively execute a defrosting mode that matches the current frost level.

[0123] In some embodiments, this defrosting control method relies on a controller built into the refrigeration equipment. The controller uses various sensors to complete data acquisition, calculation and analysis, and command output, achieving fully automated and intelligent defrosting control. During the execution of the method, the operating parameters of the refrigeration equipment are first acquired. The acquired operating parameters include at least the ambient humidity and the pressure change rate at the compressor return gas end. The ambient humidity is collected in real time by humidity sensors arranged around the refrigeration equipment and is an important environmental factor affecting the evaporator frosting speed and frost layer structure. The pressure change rate at the compressor return gas end is continuously collected and calculated by pressure sensors. Frosting on the evaporator surface increases the air duct resistance, directly causing regular changes in the return gas pressure. This parameter can intuitively reflect the growth state of the frost layer.

[0124] In some embodiments, after acquiring the ambient humidity and the rate of change of the compressor return gas pressure, the controller calculates the equivalent thickness of the frost layer on the evaporator using pre-established computational logic. The equivalent thickness of the frost layer, as a quantitative indicator, characterizes the actual physical deposition degree of frost on the evaporator surface, objectively reflecting the impact of frost on the evaporator's heat exchange efficiency, overall ventilation status, and compressor operating load. During the calculation process, the controller derives a basic thickness value based on the rate of change of the compressor return gas pressure, and then corrects the calculation results by incorporating real-time ambient humidity to offset calculation errors caused by different humidity conditions, ensuring that the calculated equivalent thickness of the frost layer closely matches the actual frosting situation of the evaporator.

[0125] In some embodiments, the controller compares the calculated equivalent frost thickness with a preset thickness threshold stored internally in the device to classify the current frost level of the evaporator. The preset thickness threshold is pre-calibrated based on the refrigeration equipment model, evaporator specifications, and operating conditions. Different threshold ranges correspond to different degrees of frost, clearly distinguishing between light, moderate, and heavy frost states. Using threshold comparison to classify the levels accurately differentiates between various frost conditions, avoiding the problem of a uniform defrosting strategy being unable to adapt to diverse frost states.

[0126] In some embodiments, after determining the current frosting level of the evaporator, the controller matches the corresponding defrosting mode according to the level, drives the various components of the refrigeration equipment to work together, and adaptively completes the defrosting operation. Different frosting levels correspond to different defrosting control logics. The execution form, operation intensity, and duration of defrosting are all set specifically according to the degree of frosting. It can use a low-interference defrosting method to maintain the normal cooling of the refrigeration equipment without interruption when there is light frosting, and can also use modes such as shutdown defrosting and intermittent defrosting to ensure that the frost layer melts when there is moderate or heavy frosting.

[0127] The defrosting control method for refrigeration equipment provided in this embodiment relies on multi-dimensional operating parameters to accurately calculate the frost thickness and determine the frost level, and then executes the corresponding defrosting mode through a graded matching method. This overcomes the inherent limitations of traditional fixed-cycle defrosting and single-electric-heating defrosting, allowing for flexible adjustment of the defrosting strategy based on the actual frost state of the evaporator. While ensuring defrosting effectiveness, it effectively reduces overall energy consumption, minimizes storage temperature fluctuations within the unit during the defrosting stage, and improves the stability and user experience of the refrigeration equipment.

[0128] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0129] Corresponding to the defrosting control method of the refrigeration equipment in the above embodiment, Figure 6This is a schematic diagram of the defrosting control device for a refrigeration equipment provided in an embodiment of this application. This device can be implemented as part or all of a computer device, which can be software, hardware, or a combination of both. Figure 7 The electronic device shown.

[0130] Reference Figure 6 The defrosting control device of the refrigeration equipment includes: The acquisition unit 601 is used to acquire the operating parameters of the refrigeration equipment, including the ambient humidity and the pressure change rate at the return end of the compressor. The determining unit 603 is used to determine the equivalent thickness of the frost layer on the evaporator of the refrigeration equipment based on the ambient humidity and the pressure change rate at the return gas end; and to determine the current frost level of the evaporator by comparing the equivalent thickness of the frost layer with a preset thickness threshold; wherein, the equivalent thickness of the frost layer is used to characterize the physical deposition degree of the frost layer adhering to the surface of the evaporator. Control unit 603 is used to control the refrigeration equipment to adaptively execute a defrosting mode that matches the current frost level.

[0131] It is understood that the embodiments of the defrosting control device for refrigeration equipment and any implementation thereof correspond to the embodiments of the defrosting control method for refrigeration equipment and any implementation thereof. The technical effects corresponding to the embodiments of the defrosting control device for refrigeration equipment and any implementation thereof can be found in the above-mentioned technical effects corresponding to the embodiments of the defrosting control method for refrigeration equipment and any implementation thereof, and will not be repeated here.

[0132] It should be noted that the defrosting control device for the refrigeration equipment provided in the above embodiments is only an example of the division of the above functional modules. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0133] The functional units and modules in the above embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of the embodiments of this application.

[0134] It should be noted that the information interaction and execution process between the above-mentioned devices / units are based on the same concept as the method embodiments of this application. For details on their specific functions and technical effects, please refer to the method embodiments section, and they will not be repeated here.

[0135] This application also provides an electronic device, which includes one or more processors and a memory; The memory is coupled to one or more processors. The memory is used to store computer program code, which includes computer instructions. One or more processors call the computer instructions to cause the electronic device to execute the defrosting control method of the refrigeration device described above.

[0136] Figure 7 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. The electronic device 700 can be a mobile phone, smart screen, tablet computer, wearable electronic device, in-vehicle electronic device, augmented reality (AR) device, virtual reality (VR) device, laptop computer, ultra-mobile personal computer (UMPC), netbook, personal digital assistant (PDA), projector, or a communication device such as a server, storage device, or base station, or a smart car, etc. This application embodiment does not impose any limitations on the specific type of electronic device.

[0137] The memory 701 can be used to store computer programs 702 and modules. The processor 703 executes various functional applications and data processing of the electronic device by running the software programs and modules stored in the memory 701. The memory 701 may mainly include a program storage area and a data storage area. The program storage area may store the operating system, application programs required for at least one function (such as sound playback function, image playback function, etc.), etc.; the data storage area may store data created according to the use of the electronic device (such as audio data, telephone directory, etc.). In addition, the memory 701 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device.

[0138] The processor 703 may include one or more processors such as a central processing unit (CPU), an application processor (AP), and a baseband processor. The processor can serve as the nerve center and command center of the wireless router. The processor 703 can generate operation control signals based on instruction opcodes and timing signals to control instruction fetching and execution. The memory 701 can be used to store executable program code, including instructions. The processor 703 executes various functional applications and data processing of the network device by running the instructions stored in the memory. The memory 701 may include a program storage area and a data storage area, such as storing data for audio signals to be played. For example, the memory may be Double Data Rate Synchronous Dynamic Random Access Memory (DDR) or Flash memory.

[0139] This application also provides a computer-readable storage medium storing computer instructions; when the computer-readable storage medium is used on an electronic device, it causes the electronic device to execute the defrosting control method of the aforementioned refrigeration device.

[0140] The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another 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 that a computer can access or can include one or more data storage devices such as servers or data centers that can be integrated with media. The available medium can be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media, or semiconductor media (e.g., solid-state disks (SSDs)).

[0141] This application also provides a computer program product containing computer instructions, which, when run on an electronic device, enables the electronic device to execute the defrosting control method for the aforementioned refrigeration equipment.

[0142] The computer storage medium and computer program product provided in the embodiments of this application are used to execute the methods provided above. Therefore, the beneficial effects they can achieve can be referred to the beneficial effects corresponding to the methods provided above, and will not be repeated here.

[0143] In the above embodiments, implementation can also be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented using 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 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 from one computer-readable storage medium to another. For example, 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, optical fiber, Digital Subscriber Line, DSL) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access, or a data storage device such as a server or data center that integrates one or more available media. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk drive (HDD), or solid-state drive (SSD), etc., and the storage medium can also include combinations of the above types of memory.

[0144] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0145] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments claimed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0146] In the embodiments provided in this application, it should be understood that the disclosed apparatus / network devices and methods can be implemented in other ways. For example, the apparatus / network device embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0147] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0148] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A refrigeration device, characterized in that, The refrigeration equipment includes: The enclosure has compartments; The compressor, evaporator, and controller are installed inside the housing; The controller is configured to: The operating parameters of the refrigeration equipment are obtained, including the ambient humidity and the pressure change rate at the return gas end of the compressor; Based on the ambient humidity and the pressure change rate at the return gas end, the equivalent thickness of the frost layer on the evaporator is determined, wherein the equivalent thickness of the frost layer is used to characterize the degree of physical deposition of the frost layer on the surface of the evaporator. By comparing the equivalent thickness of the frost layer with a preset thickness threshold, the current frost level of the evaporator is determined. The refrigeration equipment is controlled to adaptively execute a defrosting mode that matches the current frost level.

2. The refrigeration equipment according to claim 1, characterized in that, The pressure change rate at the return gas end includes the pressure decay rate, which is used to characterize the pressure drop at the return gas end per unit time. The controller determines the equivalent thickness of the frost layer on the evaporator based on the ambient humidity and the pressure change rate at the return gas end, and is specifically configured as follows: The initial frost layer thickness on the surface of the evaporator is calculated based on the pressure decay rate. Based on the deviation of the ambient humidity from the preset reference humidity, a humidity weighted correction coefficient is obtained, wherein the humidity weighted correction coefficient increases non-linearly with the increase of the deviation value; The humidity-weighted correction coefficient and the initial frost layer thickness are nonlinearly corrected to obtain the equivalent frost layer thickness.

3. The refrigeration equipment according to claim 1, characterized in that, The preset thickness threshold includes a first preset threshold and a second preset threshold, and the first preset threshold is less than the second preset threshold; The controller compares the equivalent thickness of the frost layer with a preset thickness threshold to determine the current frost level of the evaporator, specifically configured as follows: If the equivalent thickness of the frost layer is less than the first preset threshold, then the current frost level is determined to be the first frost level; If the equivalent thickness of the frost layer is greater than or equal to the first preset threshold and less than the second preset threshold, then the current frost level is determined to be the second frost level. If the equivalent thickness of the frost layer is greater than or equal to the second preset threshold, then the current frost level is determined to be the third frost level.

4. The refrigeration equipment according to claim 3, characterized in that, The defrosting modes include a first defrosting mode, a second defrosting mode, and a third defrosting mode, respectively corresponding to the first frost level, the second frost level, and the third frost level; the intensity of the first defrosting mode, the second defrosting mode, and the third defrosting mode increases sequentially; the refrigeration equipment also includes a fan assembly disposed inside the cabinet; The controller controls the refrigeration equipment to adaptively execute a defrosting mode that matches the current frosting level, specifically configured as follows: If the current frosting level is the first frosting level, then the refrigeration equipment is controlled to execute the first defrosting mode, wherein, in the first defrosting mode, the operating frequency of the compressor is reduced and the fan assembly operates at a first speed to keep the refrigeration cycle uninterrupted; If the current frosting level is the second frosting level, then the refrigeration equipment is controlled to execute the second defrosting mode. In the second defrosting mode, the power supply to the compressor is cut off and the fan assembly is controlled to operate at a second speed lower than the first speed. After a preset first defrosting time, the refrigeration is restarted. If the current frosting level is the third frosting level, then the refrigeration equipment is controlled to execute the third defrosting mode, wherein the third defrosting mode alternates between the shutdown defrosting stage and the strong cooling water-locking stage according to a preset cycle. The shutdown defrosting stage is configured to: cut off the power supply to the compressor and use the heat of the air inside the housing to melt the frost layer on the surface of the evaporator; The strong cooling and water-locking stage is configured to: restore the power supply of the compressor and operate it at maximum load, cooling and freezing the free water on the surface of the evaporator to block its migration path.

5. The refrigeration equipment according to claim 4, characterized in that, The operating parameters also include the storage temperature inside the enclosure; the storage temperature is the air temperature at the geometric center of the enclosure; the controller is further configured to: Before executing the second defrost mode or the third defrost mode, the refrigeration system of the refrigeration equipment is controlled to operate at maximum load to reduce the storage temperature inside the cabinet to below the set target temperature in order to store cold energy. During the process of the refrigeration equipment adaptively executing a defrosting mode with a matching intensity, the storage temperature inside the cabinet is monitored in real time. If the storage temperature inside the box is higher than the sum of the set target temperature and the preset positive deviation, the current speed of the fan assembly is increased; if the storage temperature inside the box is lower than the difference between the set target temperature and the preset negative deviation, the current speed of the fan assembly is decreased, so as to maintain the storage temperature inside the box within the preset temperature range.

6. The refrigeration equipment according to claim 5, characterized in that, Before executing the second or third defrost mode, the controller is further configured to: The compressor is controlled to continue running at the current operating frequency for a first preset duration in order to balance the internal pressure of the refrigeration system.

7. The refrigeration equipment according to any one of claims 1 to 4, characterized in that, The controller is also configured to: During the defrosting mode, the operating parameters of the refrigeration equipment are acquired in real time. If the operating parameters are determined to meet the preset defrosting completion conditions, the refrigeration equipment is controlled to automatically exit defrosting and resume normal refrigeration cycle.

8. The refrigeration equipment according to claim 7, characterized in that, The operating parameters also include the evaporator surface temperature and the cumulative defrosting time; the preset defrosting completion conditions include any of the following: The surface temperature of the evaporator rises to the preset defrosting termination temperature; The rate of change of return gas pressure decreases and remains maintained at a preset pressure threshold. The cumulative defrosting time reaches the preset maximum allowable time.

9. The refrigeration equipment according to any one of claims 1 to 4, characterized in that, The operating parameters also include the overall heat load inside the enclosure; the controller is further configured to: The overall heat load inside the chamber is determined by detecting at least one of the compressor's operating current, input power, or images of the storage compartments.

10. A defrosting control method for a refrigeration device, characterized in that, The method includes: Obtain the operating parameters of the refrigeration equipment, including ambient humidity and the pressure change rate at the return gas end of the compressor; Based on the ambient humidity and the pressure change rate at the return gas end, the equivalent thickness of the frost layer on the evaporator of the refrigeration equipment is determined, wherein the equivalent thickness of the frost layer is used to characterize the physical deposition degree of the frost layer adhering to the surface of the evaporator; By comparing the equivalent thickness of the frost layer with a preset thickness threshold, the current frost level of the evaporator is determined. The refrigeration equipment is controlled to adaptively execute a defrosting mode that matches the current frost level.

Images