Defrosting method, evaporator mechanism and refrigerator

Abstract

The invention relates to a defrosting method, an evaporator mechanism and a refrigerator, the defrosting method is applied to the refrigerator, the refrigerator comprises at least two chambers, each chamber is correspondingly provided with an evaporator, a heat insulation plate is arranged between every two adjacent evaporators, and the refrigerator further comprises defrosting heaters connected with the evaporators; according to the defrosting method, through targeted defrosting and adjacent chamber cooling, the problem that in the prior art, due to the fact that a whole machine is shut down for defrosting, food materials are repeatedly frozen and thawed is effectively solved, when the target chamber is defrosted, only refrigerant flowing of the corresponding evaporator is stopped, the adjacent chamber reduces the temperature through the corresponding evaporator, and the heat insulation effect of the heat insulation plate is combined, so that the defrosting efficiency is improved. The temperature of the adjacent chambers can be kept stable, food materials are prevented from being damaged due to temperature rise, and the fresh-keeping quality is guaranteed.

Description

Technical Field

[0001] This application relates to the field of refrigerators, and more particularly to a defrosting method, an evaporator mechanism, and a refrigerator. Background Technology

[0002] As consumers increasingly demand diverse food preservation functions from refrigerators, multi-temperature zone refrigerators with variable temperature compartments have gradually become the mainstream in the market. To achieve precise and independent temperature control, the variable temperature zone and the freezer zone typically require separate evaporators.

[0003] In existing technical solutions, defrosting a parallel dual-evaporator refrigerator can only be done by shutting down the entire unit. When one evaporator is defrosting, the temperature in both compartments rises rapidly, causing food to freeze and thaw repeatedly. Heating at the same time leaves residual ice, which accelerates secondary frosting, increases wind resistance and energy consumption, and can cause ice blockage and burn out the fan. Summary of the Invention

[0004] This application provides a defrosting method, an evaporator mechanism, and a refrigerator to solve the problems of dual-evaporator refrigerators where defrosting requires the entire unit to be shut down, where the temperature of the two compartments rises rapidly when one evaporator is defrosting, causing food to freeze and thaw repeatedly, where unified heating leaves residual ice, accelerates secondary frosting, increases wind resistance and energy consumption, and causes ice blockage to burn out the fan.

[0005] In a first aspect, this application provides a defrosting method for a refrigerator, the refrigerator comprising at least two compartments, each compartment corresponding to an evaporator, with a heat insulation plate disposed between adjacent evaporators, the refrigerator further comprising: a defrosting heater connected to each evaporator, characterized in that the method comprises the following steps: Identify the target room in at least two compartments; If the frost thickness in the target compartment meets the preset thickness condition, the refrigerant flow in the evaporator corresponding to the target compartment is stopped. The evaporator of the adjacent room next to the target room is controlled to cool down the adjacent room, and the defrost heater is controlled to heat the evaporator of the target room so that the evaporator of the target room is heated. The temperature of the evaporator in the target chamber is detected to determine whether the temperature of the evaporator in the target chamber meets the preset temperature condition. If the preset temperature condition is met, the defrosting heater stops heating the evaporator of the target compartment, and the refrigerant flow in the evaporator corresponding to the target compartment is restored.

[0006] Optionally, controlling the evaporator of the adjacent compartment to cool the adjacent compartment and controlling the defrost heater to heat the evaporator of the target compartment includes: Detect the temperature of the adjacent rooms; The temperature reduction value of the adjacent room is determined based on the frost thickness of the target room; Increase the refrigerant flow rate based on the current refrigerant flow rate of the evaporator in the adjacent compartment; When the temperature of the adjacent compartment drops below the set temperature, the current refrigerant flow rate of the evaporator in the adjacent compartment is restored.

[0007] Optionally, determining the temperature drop value of the adjacent room based on the frost thickness of the target room includes: Calculate the estimated defrosting temperature and estimated defrosting time corresponding to the thickness of the frost layer; Calculate the estimated defrosting heat accumulation value based on the estimated defrosting temperature and estimated defrosting time; Obtain the heat transfer coefficient between the target room and the adjacent room; The estimated temperature rise of the adjacent room is calculated based on the estimated cumulative defrosting heat value and the heat transfer coefficient, and the estimated temperature rise value is added to the preset temperature margin to obtain the temperature drop value.

[0008] Optionally, the defrosting method further includes: obtaining the frost thickness of the adjacent compartments; Calculate the difference between the frost thickness of the adjacent compartment and the thickness threshold. The difference is multiplied by a preset negative factor to obtain the preset temperature margin.

[0009] Optionally, determining whether the temperature of the evaporator in the target chamber meets a preset temperature condition includes: Determine whether the temperature of the evaporator in the target chamber after the temperature rises is greater than a preset temperature value; If the temperature of the evaporator in the target chamber rises above a preset temperature value, determine whether the temperature of the evaporator in the target chamber remains above the preset temperature value for a first preset duration. If the temperature of the evaporator in the target chamber remains above the preset temperature value for a first preset duration, the preset temperature condition is determined to be met.

[0010] Optionally, determining the target room among at least two rooms includes: Obtain the frost thickness of each compartment and the space type of each compartment, including: freezing type and refrigeration type; When there is only one compartment where the frost thickness is greater than the preset thickness threshold, the compartment with the frost thickness greater than the preset thickness threshold is identified as the target compartment. When two or more frost layers have a thickness greater than a preset thickness threshold, the room with the space type of freezing is selected as the target room.

[0011] Optionally, controlling the defrosting heater to heat the evaporator of the target compartment includes: The frost thickness of the target compartment is obtained, and the temperature of the defrosting heater corresponding to the evaporator of the target compartment is adjusted according to the frost thickness. The temperature of the defrosting heater gradually increases as the frost thickness increases.

[0012] Optionally, each of the evaporators is equipped with a fan; Before restoring the refrigerant flow in the evaporator corresponding to the target compartment, the following steps are also included: Turn on the fan corresponding to the target room to blow away the defrost water generated on the evaporator of the target room; Determine whether the operating time of the fan is greater than a preset time. If the operating time is greater than the preset time, shut down the fan and execute the step of restoring the refrigerant flow in the evaporator corresponding to the target room.

[0013] Optionally, each of the rooms is provided with a corresponding door, and the method includes: While controlling the defrosting heater to heat the evaporator of the target compartment, the state of the door of the target compartment is detected; If the door of the target room changes from closed to open, heating of the evaporator in the target room will stop. When heating of the evaporator in the target chamber is stopped, if the door of the target chamber switches from the open state to the closed state, then heating of the evaporator in the target chamber continues. Alternatively, when controlling the defrosting heater to heat the evaporator of the target compartment, the heating time is timed, and if the timed duration is greater than a second preset duration, an alarm message is generated and the defrosting heater is turned off.

[0014] Secondly, this application provides an evaporator mechanism, comprising: A housing, wherein the housing has an air duct; A heat insulation board, wherein the heat insulation board divides the air duct into a first air duct and a second air duct, the first air duct and the second air duct being arranged side by side in a horizontal direction; A first evaporator is connected to the housing and located in the first air duct; A second evaporator is connected to the housing and located in the second air duct; The controller is electrically connected to the defrost heater and to the control valves on the first evaporator and the second evaporator, and is used to execute the defrost method provided in the first aspect of this application.

[0015] Thirdly, this application provides a refrigerator, comprising: The refrigerator body has a first compartment and a second compartment. The second aspect of this application provides an evaporator mechanism in which the first evaporator and the second evaporator are used to cool the first compartment and the second compartment, respectively.

[0016] The technical solutions provided in this application have the following advantages compared with the prior art: The defrosting method provided in this application effectively solves the problem of repeated freeze-thaw cycles caused by the shutdown of the entire machine during defrosting in the prior art. By targeting defrosting and cooling adjacent compartments, the method stops the refrigerant flow in the corresponding evaporator during defrosting in the target compartment. The defrosting heater only heats the target evaporator. Combined with the design that stops the refrigerant flow in the target evaporator, the temperature of the target evaporator can be rapidly increased. Simultaneously, the partition can insulate the temperature of the target compartment, minimizing heat transfer to adjacent compartments. Because the evaporator in the adjacent compartment is controlled to cool it, even if the transferred heat raises the temperature of the adjacent compartment, it will offset the cooling, preventing the adjacent compartment from overheating and maintaining relative stability. This ensures stable temperature in the adjacent compartments, preventing damage to food due to temperature increases and guaranteeing freshness. It also ensures complete melting of the frost layer, eliminating residual ice and fundamentally preventing the risks of secondary frosting, increased wind resistance, and ice blockage burning out the fan. The entire refrigerator does not need to be shut down during the defrosting process. Adjacent compartments maintain a low-temperature storage environment through active cooling, preventing the temperature of adjacent compartments from being affected by the temperature rise of the target compartment. After the target compartment is defrosted, the refrigerator quickly resumes cooling, which not only ensures the refrigerator's continuous cooling capacity, but also significantly shortens the defrosting time and reduces energy consumption. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0020] Figure 1This is a schematic diagram of the evaporator mechanism provided in an embodiment of this application; Figure 2 The process of the defrosting method provided in the embodiments of this application Figure 1 ; Figure 3 The process of the defrosting method provided in the embodiments of this application Figure 2 ; Figure 4 The graph showing the relationship between real-time frost thickness and defrost heater temperature is provided for an embodiment of this application.

[0021] Explanation of reference numerals in the attached figures: 1. Shell; 2. Insulation plate; 1a. First air duct; 1b. Second air duct; 3. First evaporator; 4. Second evaporator; 5. First fan; 6. Second fan. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0024] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0025] To address the technical problems in existing dual-evaporator refrigerators where defrosting requires shutting down the entire unit, and where rapid temperature increases in both compartments during defrosting of one evaporator leads to repeated freezing and thawing of food; and where unified heating leaves residual ice, accelerating secondary frosting, drastically increasing wind resistance and energy consumption, and potentially causing ice blockage and fan burnout, this application provides a defrosting method. By independently controlling the shutdown of the corresponding evaporator and the activation of the defrosting heater, independent defrosting of the evaporators corresponding to the target compartment and adjacent compartments is achieved. While one evaporator is defrosting, the other evaporator can operate normally, ensuring that the cooling needs of the corresponding compartment of the refrigerator are not affected and maintaining a stable storage environment.

[0026] Figure 2 and Figure 4 This application provides a defrosting method for a refrigerator, the refrigerator including at least two compartments, each compartment corresponding to an evaporator, and a heat insulation plate 2 disposed between adjacent evaporators. The refrigerator also includes a defrosting heater connected to each evaporator. The method is characterized by comprising the following steps: Step S100: Identify the target room among at least two rooms; Step S200: When the frost layer thickness in the target compartment meets the preset thickness condition, stop the refrigerant flow in the evaporator corresponding to the target compartment; In step S300, the evaporator of the adjacent room next to the target room is controlled to cool down the adjacent room, and the defrost heater is controlled to heat the evaporator of the target room so that the evaporator of the target room is heated. Step S400: Detect the temperature of the evaporator in the target chamber and determine whether the temperature of the evaporator in the target chamber meets the preset temperature conditions. In step S500, if the preset temperature is met, stop the defrosting heater from heating the evaporator of the target compartment and restore the refrigerant flow in the evaporator corresponding to the target compartment.

[0027] In one embodiment, the two compartments of the refrigerator can be any two of a freezer compartment, a refrigerator compartment, or a variable temperature compartment. The insulation board 2 can be made of insulation materials such as polyurethane insulation board 2 or vacuum insulation board 2. First, the frost thickness detection module built into the refrigerator, such as an infrared ranging sensor or a capacitive frost detection device, continuously monitors the frost thickness of the evaporator in each compartment. The system presets a frost thickness threshold h (e.g., frost thickness ≥ 3 mm). When the frost thickness of a certain compartment meets the threshold, the compartment is determined as the target compartment, and the adjacent compartment is determined (e.g., if the target compartment is the freezer compartment, the adjacent compartment is the variable temperature compartment; if the target compartment is the variable temperature compartment, the adjacent compartment is the refrigerator compartment).

[0028] The system sends a shut-off signal to the electromagnetic shut-off valve in the evaporator circuit corresponding to the target compartment, cutting off the refrigerant path between the evaporator and the refrigeration system, stopping the refrigerant flow to the target evaporator, and creating conditions for defrosting heating. The system controls the evaporator in the adjacent compartment to start an enhanced cooling mode, specifically by increasing the refrigerant circulation rate and the operating power of the refrigeration compressor to actively cool the adjacent compartment. Simultaneously, the insulation plate 2 between adjacent evaporators blocks the heat generated during defrosting in the target compartment from being conducted to the adjacent compartment, providing double protection to lower the temperature of the adjacent compartment and maintain it within the set low-temperature range. Simultaneously, the defrosting heater, such as an electric heating wire, matched to the evaporator in the target compartment is activated, outputting heat to the target evaporator to melt the frost layer on its surface. A PTC heater is used instead of an electric heating wire for the defrosting heater, improving heating stability and safety. The frost thickness threshold h can be adjusted to 2mm or 4mm according to the ambient humidity to adapt to different climatic conditions. The preset defrosting temperature can be set to 3℃-5℃ to meet the defrosting needs of different types of evaporators.

[0029] The system uses a temperature sensor mounted on the surface of the target evaporator to collect the evaporator temperature in the target compartment in real time. The preset temperature condition is an evaporator temperature ≥ 3℃ (the critical temperature to ensure complete frost melting). The system compares the detected temperature with the preset temperature condition in real time. After maintaining the evaporator temperature in the target compartment at the preset temperature for a period of time, the system ensures that the frost can melt normally. When the target evaporator temperature is detected to have reached the preset temperature, the system issues a stop command to shut down the defrosting heater and simultaneously controls the solenoid shut-off valve to reset, restoring refrigerant flow to the target evaporator and allowing it to re-enter the normal refrigeration cycle, thus completing the defrosting operation.

[0030] The defrosting method provided in this application effectively solves the problem of repeated freeze-thaw cycles caused by the shutdown of the entire machine during defrosting in the prior art. By targeting defrosting and cooling adjacent compartments, the method stops the refrigerant flow in the corresponding evaporator during defrosting in the target compartment. The defrosting heater only heats the target evaporator. Combined with the design that stops the refrigerant flow in the target evaporator, the temperature of the target evaporator can be rapidly increased. Simultaneously, the partition can insulate the temperature of the target compartment, minimizing heat transfer to adjacent compartments. Because the evaporator in the adjacent compartment is controlled to cool it, even if the transferred heat raises the temperature of the adjacent compartment, it will offset the cooling, preventing the adjacent compartment from overheating and maintaining relative stability. This ensures stable temperature in the adjacent compartments, preventing damage to food due to temperature increases and guaranteeing freshness. It also ensures complete melting of the frost layer, eliminating residual ice and fundamentally preventing the risks of secondary frosting, increased wind resistance, and ice blockage burning out the fan. The entire refrigerator does not need to be shut down during the defrosting process. Adjacent compartments maintain a low-temperature storage environment through active cooling, preventing the temperature of adjacent compartments from being affected by the temperature rise of the target compartment. After the target compartment is defrosted, the refrigerator quickly resumes cooling, which not only ensures the refrigerator's continuous cooling capacity, but also significantly shortens the defrosting time and reduces energy consumption.

[0031] Please see Figure 2 and Figure 3 The system controls the evaporators of adjacent compartments to cool those compartments and controls the defrost heaters to heat the evaporators of the target compartment, including: Detect the temperature of adjacent rooms; The temperature reduction value of adjacent rooms is determined based on the frost thickness of the target room; Increase the refrigerant flow rate based on the current refrigerant flow rate of the evaporator in the adjacent compartment; When the temperature of an adjacent compartment drops below the set temperature, the current refrigerant flow rate of the evaporator in the adjacent compartment is restored.

[0032] In this embodiment, after determining the target room and ensuring its frost thickness meets preset conditions, the temperature of the adjacent room is detected in real time by a temperature sensor located in the adjacent room, and the frost thickness detection data of the target room is recorded simultaneously. The system presets the correspondence between frost thickness and temperature reduction value as follows: when the frost thickness is 2-3mm, the temperature reduction value is set to 2℃; when the frost thickness is 3-4mm, the temperature reduction value is set to 3℃. That is, the corresponding temperature reduction value of the adjacent room is automatically matched according to the actual frost thickness of the target room, and the required temperature reduction range of the adjacent room is determined. The main reason is that the greater the frost thickness, the longer the defrosting time is required. As the defrosting time progresses, the temperature of the adjacent room will be affected by the temperature rise of the target room, resulting in a temperature increase or poor cooling effect.

[0033] By controlling the electronic expansion valve or refrigerant flow regulating valve corresponding to the evaporator in the adjacent compartment of the refrigerator's refrigeration system, the opening degree is increased based on the current refrigerant flow rate, such as adjusting it from the initial opening of 50% to 70%-80%, thereby increasing the refrigerant flow rate, enhancing the cooling capacity of the evaporator in the adjacent compartment, and driving the temperature of the adjacent compartment to drop rapidly. The system continuously monitors the temperature changes of the adjacent compartment through a temperature sensor. When the temperature drop of the adjacent compartment exceeds the preset temperature drop value, such as the preset temperature drop value of 2℃ and the actual temperature drop of 2.5℃, the system immediately controls the electronic expansion valve or refrigerant flow regulating valve to reset, restoring the initial refrigerant flow rate of the evaporator in the adjacent compartment, maintaining the temperature of the adjacent compartment stable within the set range, and simultaneously continuously controlling the defrost heater to heat the evaporator in the target compartment until its temperature meets the preset conditions.

[0034] The defrosting method of this application dynamically determines the cooling value of adjacent rooms based on the frost thickness of the target room, achieving a precise match between cooling demand and defrosting heat interference. When the frost layer is thicker, the defrosting heat is stronger, and a larger cooling value is set accordingly to avoid the temperature of adjacent rooms rising. Combined with the on-demand increase and timely recovery of refrigerant flow, it ensures that the temperature of adjacent rooms drops rapidly to offset the impact of defrosting heat, while preventing excessive cooling and energy waste. This solves the problem of uncontrolled temperature in adjacent rooms during traditional defrosting. Through real-time closed-loop monitoring by temperature sensors and dynamic adjustment of refrigerant flow, it ensures that the temperature reduction of adjacent rooms is precisely controlled within a reasonable range. This effectively prevents food from being damaged by excessively low or fluctuating temperatures, ensuring freshness. Simultaneously, the evaporator in the target compartment receives targeted heating while the refrigerant is stopped, resulting in more thorough frost melting and eliminating residual ice. This fundamentally avoids the risks of secondary frost formation, increased air resistance, and ice blockage that could burn out the fan. The refrigerant flow is only temporarily increased when adjacent compartments require cooling, and immediately returns to normal once the desired temperature is reached. This eliminates the need for continuous high-load operation, significantly reducing energy consumption during the defrosting process. Compared to a fixed increase in refrigerant flow, this method reduces energy consumption, and the control logic adapts to different frost thickness scenarios, offering strong compatibility and improving the refrigerator's operational stability and lifespan.

[0035] Please see Figure 2 and Figure 3 The temperature reduction value of adjacent rooms is determined based on the frost thickness of the target room, including: Calculate the estimated defrosting temperature and estimated defrosting time corresponding to the frost thickness; Calculate the estimated cumulative defrosting heat based on the estimated defrosting temperature and estimated defrosting time; Obtain the heat transfer coefficient between the target room and adjacent rooms; The estimated temperature rise of adjacent rooms is calculated based on the estimated cumulative defrosting heat and heat transfer coefficient. The estimated temperature rise is then added to the preset temperature margin to obtain the temperature drop value.

[0036] In one embodiment, after obtaining the actual frost thickness of the evaporator in the target compartment through the frost thickness detection module, the system calls the preset frost thickness-defrosting parameter mapping model, and calculates the estimated defrosting temperature (e.g., 5°C for a frost thickness of 3mm; 7°C for a frost thickness of 4mm) and the estimated defrosting time (e.g., 3 minutes for a frost thickness of 3mm; 5 minutes for a frost thickness of 4mm) corresponding to the frost thickness. Based on the heat calculation formula Q=P×t (P is the power of the defrosting heater, t is the estimated defrosting time), and combined with the heat loss coefficient corresponding to the estimated defrosting temperature, the estimated cumulative defrosting heat value is calculated. By using the heat transfer test data of the insulation board 2, the heat transfer coefficient K between the target compartment and the adjacent compartment is obtained. For example, based on the material and structure of the insulation board 2, the heat transfer coefficient of the insulation board 2 is determined to be K, which is pre-stored in the refrigerator control system. According to the heat transfer formula ΔT=Q / (K×S×t) (Q is the estimated cumulative defrosting heat value, K is the heat transfer coefficient, S is the contact area of ​​the insulation board 2, and t is the estimated defrosting time), the estimated temperature rise value ΔT=P / (K×S) of the adjacent compartment is calculated. Then, a preset temperature margin is added to offset the influence of ambient temperature fluctuations, and finally the temperature drop value of the adjacent compartment is determined.

[0037] This application derives the estimated defrosting temperature, time, and cumulative heat value based on the frost thickness, and combines this with the actual heat transfer coefficients of the target room and adjacent rooms to accurately calculate the estimated temperature drop value of adjacent rooms. Furthermore, through preset temperature margin compensation, the temperature drop value is perfectly matched with the actual heat interference during the defrosting process (e.g., the thicker the frost layer, the stronger the defrosting heat, and the larger the calculated temperature drop value, accurately offsetting the temperature rise caused by heat conduction). This effectively solves the problems of traditional fixed temperature drops not being adaptable to different defrosting scenarios and the tendency for adjacent room temperatures to become uncontrollable. The calculation of the temperature drop value covers all parameters of the defrosting process. Based on its heat transfer characteristics, it avoids both insufficient cooling leading to increased temperature in adjacent compartments and damage to food from freezing and thawing, and excessive cooling causing energy waste. At the same time, the evaporator in the target compartment melts the frost more thoroughly under targeted heating, eliminating residual ice and fundamentally avoiding the risks of secondary frosting, increased wind resistance, and ice blockage burning out the fan. The calculation logic is based on the refrigerator's inherent structural parameters and core defrosting variables, requiring no additional hardware costs. It is also adaptable to different frost thicknesses and different compartment combinations, exhibiting strong compatibility and significantly improving the stability of the refrigerator's defrosting process and the food preservation effect, while reducing overall energy consumption.

[0038] Please see Figure 2 and Figure 3 The defrosting method also includes: obtaining the frost thickness of adjacent compartments; Calculate the difference between the frost thickness of adjacent compartments and the thickness threshold. Multiply the difference by a preset negative factor to obtain the preset temperature margin.

[0039] In one embodiment of this application, after determining the target compartment and calculating its estimated cumulative defrosting heat, the real-time frost thickness of the evaporator in the adjacent compartment is obtained through a frost thickness detection module installed in the adjacent compartment; a pre-stored frost thickness threshold (e.g., 2mm) for the adjacent compartment is retrieved, and the difference between the real-time frost thickness of the adjacent compartment and the threshold is calculated (difference = real-time frost thickness - thickness threshold); according to the correlation rule that the difference is inversely proportional to the preset temperature margin, the calculated difference is multiplied by a preset negative factor (e.g., -0). The negative factor (.5℃ / mm) is used to achieve an inverse relationship between the difference and the temperature margin. The calculation result is the preset temperature margin required for this defrosting. For example, when the real-time frost thickness of the adjacent room is 3mm, the difference = 3mm - 2mm = 1mm, and the preset temperature margin = 1mm × (-0.5℃ / mm) = -0.5℃. When the real-time frost thickness of the adjacent room is 4mm, the difference = 4mm - 2mm = 2mm, and the preset temperature margin = 2mm × (-0.5℃ / mm) = -1℃. Based on this, the temperature drop value is determined by combining the aforementioned steps: the estimated temperature rise value of the adjacent compartment is calculated using the heat transfer formula, and the estimated temperature rise value is added to the calculated preset temperature margin to obtain the final temperature drop value; then, the electronic expansion valve corresponding to the evaporator of the adjacent compartment is controlled to increase the opening degree and increase the refrigerant flow. When the temperature drop of the adjacent compartment is detected to exceed the final temperature drop value, the initial refrigerant flow of the evaporator is restored, and the defrosting heater is continuously controlled to heat the evaporator of the target compartment until its temperature reaches the preset condition.

[0040] This application further improves the accuracy and adaptability of defrosting control by adding a design that links the frost layer thickness of adjacent compartments to the preset temperature margin. Utilizing the inverse relationship between the difference between the frost layer thickness and the thickness threshold of adjacent compartments and the preset temperature margin, dynamic adjustment of the temperature margin is achieved. The thicker the frost layer in adjacent compartments, the larger the difference, the smaller the corresponding preset temperature margin, and the lower the final temperature drop. This avoids energy waste caused by excessive cooling in adjacent compartments and matches reasonable cooling needs according to the actual frost state of adjacent compartments, accurately offsetting the impact of defrosting heat conduction and preventing repeated freezing and thawing of food due to increased temperature in adjacent compartments. The calculation of quantities requires no additional hardware and can be achieved using existing detection modules and algorithms, reducing the implementation cost of the technical solution. At the same time, it forms a closed-loop control with the previous frost layer thickness and defrosting parameter mapping model and the dynamic adjustment logic of refrigerant flow, making the entire defrosting process more in line with the actual operating state of the refrigerator. The dynamically adjusted cooling value can effectively avoid the problem of excessive load on the evaporator of adjacent compartments due to continuous high refrigerant flow. Combined with targeted heating of the target compartment, it can not only ensure that the frost layer melts completely and eliminate residual ice, but also extend the service life of the evaporator and compressor, further reducing the overall energy consumption of the refrigerator and improving operational stability.

[0041] Please see Figure 2 and Figure 3 Determine whether the temperature of the evaporator in the target compartment meets the preset temperature conditions, including: Determine whether the temperature of the evaporator in the target compartment after the temperature rises is greater than the preset temperature value; If the temperature of the evaporator in the target chamber rises above the preset temperature value, determine whether the temperature of the evaporator in the target chamber remains above the preset temperature value for a first preset duration. If the temperature of the evaporator in the target chamber remains above the preset temperature value for a first preset duration, the preset temperature condition is determined to be met.

[0042] In this embodiment, during the process of controlling the defrosting heater to heat the evaporator corresponding to the target compartment, and the evaporator in the adjacent compartment to complete active cooling and restore the initial refrigerant flow, the temperature data of the target evaporator is collected in real time by a temperature sensor attached to the surface of the target evaporator. The system continuously judges whether the temperature of the evaporator after the rise is greater than the preset temperature value of the system, such as 5°C. This temperature is the critical temperature to ensure that the frost layer melts completely and there is no residual ice. If the temperature of the target evaporator is detected to be greater than 5°C, the system timing function is triggered to determine whether the temperature state lasts for a first preset time, such as 3 minutes. If the target evaporator temperature is stable above 5°C for 3 minutes, the system immediately determines that the preset temperature condition is met and the defrosting process is completed. Otherwise, the system continues to maintain the heating state of the defrosting heater until the temperature meets the duration requirement.

[0043] This application employs a dual defrosting completion judgment logic based on temperature threshold determination and duration verification. Compared to solutions that rely solely on temperature reaching a threshold as the basis for defrosting completion, the addition of a first preset duration verification step effectively avoids misjudgments caused by a sudden surge in evaporator surface temperature due to rapid melting of local frost layers, resulting in incomplete melting of the actual frost layer. This ensures that the frost layer on the target evaporator surface melts, effectively preventing the risk of residual ice. The combination of preset temperature value and duration judgment criteria can adapt to defrosting scenarios with different frost thicknesses, improving the accuracy and reliability of defrosting control.

[0044] Please see Figure 2 and Figure 3 Identify the target room in at least two rooms, including: Obtain the frost thickness of each compartment and the space type of each compartment, including: freezer type and refrigerator type; When there is only one compartment where the frost thickness is greater than the preset thickness threshold, the compartment with the frost thickness greater than the preset thickness threshold is identified as the target compartment. When two or more frost layers have a thickness greater than a preset thickness threshold, the room with the space type of freezing is selected as the target room.

[0045] In one embodiment, the system acquires real-time frost thickness data of the evaporators in all compartments of the refrigerator, while simultaneously retrieving pre-stored space type information for each compartment. The space types are divided into freezing and refrigeration types, such as a freezer with a set temperature less than -18°C, a variable temperature compartment with a set temperature of 0°C-2°C, and a refrigeration compartment with a set temperature of 2-8°C. The system compares the frost thickness of each compartment with a preset thickness threshold of 3mm. If only one compartment has a frost thickness greater than the threshold, that compartment is directly identified as the target compartment, and the defrosting process for that compartment is initiated. If two or more compartments have frost thicknesses greater than the preset thickness threshold, the compartment with the freezing type is selected as the target compartment. After the freezing type compartment has been defrosted, the remaining variable temperature or refrigeration type compartments that exceed the threshold are then defrosted sequentially.

[0046] This application determines the target compartment through a dual priority rule of frost thickness and space type. Prioritizing frost thickness as the core criterion ensures that compartments with severe frost accumulation are defrosted first, avoiding the impact of excessive frost on evaporator cooling efficiency and increased energy consumption. When the frost in multiple compartments exceeds the threshold, the freezing type compartment is selected first because the temperature in the freezing type compartment is lower, the frost is more difficult to melt, and the frost accumulation has a more significant impact on the freeze-thaw damage of frozen food. Prioritizing defrosting can minimize the loss of food quality and avoid the risk of ice blockage caused by excessive frost in the freezer compartment.

[0047] Please see Figures 2 to 4 The method of controlling the defrost heater to heat the evaporator of the target compartment includes: obtaining the frost thickness of the target compartment, adjusting the temperature of the defrost heater at the position corresponding to the evaporator of the target compartment according to the frost thickness, and the temperature of the defrost heater gradually increasing as the frost thickness increases.

[0048] In this embodiment, during the defrosting process, the thickness sensor continuously collects the real-time frost thickness A of the evaporator under defrosting conditions. The collection frequency can be set to once every 5 seconds, and the data is transmitted to the refrigerator controller in real time. The controller sets multiple sets of matching relationships between thickness ranges and target temperatures: when A≥h (h is the frost thickness threshold of 3mm), the defrosting heater temperature T is set to the highest level (e.g., 60℃); when h / 2<A<h, T is adjusted to the medium level (e.g., 45℃); when A≤h / 2, T is adjusted to the low level (e.g., 30℃); when A approaches 0mm, T is reduced to the heat preservation level (e.g., 25℃). The thickness range can be further refined into four levels (A≥3mm, 2mm≤A<3mm, 1mm≤A<2mm, A<1mm), corresponding to T values ​​of 55℃, 40℃, 30℃, and 22℃, respectively. The defrosting heater uses a variable frequency controlled PTC heater or electric heating wire. Its temperature is adjusted by changing the power supply voltage or current through the controller. At the same time, the temperature sensor on the surface of the evaporator provides real-time feedback on the heating temperature, forming a closed-loop control to ensure that T accurately follows the change of A and dynamically adjusts.

[0049] This dynamic defrosting temperature adjustment design monitors the frost thickness in real time and matches the corresponding heater temperature, precisely adapting to the heat requirements at different stages of frost melting: when the frost is thick, it rapidly melts the ice with high temperature; as the frost thins, it gradually cools down to avoid overheating. This ensures complete frost melting and reduces energy waste at the source, significantly improving defrosting efficiency. It avoids the redundant heating problem caused by traditional constant-temperature defrosting, reducing the risk of excess heat generated by the heater spreading to the refrigerator compartments during defrosting, further ensuring the temperature stability of non-defrosting compartments, and reducing the refrigerator's cooling compensation energy consumption after defrosting. The closed-loop adjustment logic and multi-level temperature settings make the defrosting process more controllable and precise, avoiding the impact of frost residue or overheating on the evaporator's lifespan and improving the reliability of the refrigeration system. Multiple thickness ranges and temperature adjustment options are available to adapt to refrigerators with different types of evaporators and different usage environments, enhancing the versatility and adaptability of the solution, while also conforming to the trend of energy-saving and consumption-reducing product design.

[0050] Please see Figure 2 and Figure 3 Each evaporator is equipped with a fan; Before restoring refrigerant flow in the evaporator corresponding to the target compartment, the following steps are also required: Turn on the fan corresponding to the target room to blow away the defrost water generated on the evaporator of the target room; Determine if the fan's operating time exceeds the preset time. If the operating time exceeds the preset time, shut down the fan and execute the step of restoring refrigerant flow in the evaporator corresponding to the target room.

[0051] In one embodiment, after stopping the defrosting heater and before restoring refrigerant flow to the target compartment evaporator, the system starts the fan corresponding to the target compartment evaporator, such as a centrifugal silent fan or an axial fan, and uses the airflow generated by the fan to blow the evaporator surface to completely dry the condensate generated during the defrosting process; when there are no visible water stains on the evaporator surface and the humidity sensor detects that the humidity on the evaporator surface has dropped to a preset humidity threshold, the fan is turned off, and then the electromagnetic reversing valve corresponding to the target compartment evaporator is reset to restore refrigerant flow, so that the target compartment re-enters the refrigeration cycle.

[0052] This application adds a step of drying defrost water with a fan after defrosting. This dries the defrost water on the evaporator surface before refrigerant flow is restored, preventing residual moisture from freezing rapidly after refrigerant circulation restarts. This effectively eliminates the problems of secondary icing and accelerated frost buildup on the evaporator surface. The fan drying operation requires no additional hardware; it can be achieved directly using the evaporator's built-in fan, reducing the implementation cost of the technical solution. Furthermore, since the drying process is completed before refrigerant restoration, it does not cause significant fluctuations in the target compartment temperature. Combined with the low-temperature maintenance strategy for adjacent compartments, this further ensures the freshness of food. This step, together with the previous dynamic temperature-controlled defrosting and continuous temperature verification processes, forms a complete closed loop, making the entire defrosting process more precise and reliable. This effectively extends the service life of components such as the evaporator and fan, improves the overall operational stability of the refrigerator, and reduces subsequent maintenance costs.

[0053] Please see Figure 2 and Figure 3 Each room has a corresponding door, the method of which includes: While controlling the defrosting heater to heat the evaporator of the target compartment, the status of the door of the target compartment is detected; If the door of the target room changes from closed to open, heating of the evaporator in the target room will stop. When heating the evaporator of the target compartment is stopped, if the door of the target compartment changes from the open state to the closed state, then heating of the evaporator of the target compartment will continue. Alternatively, when controlling the defrosting heater to heat the evaporator of the target compartment, the heating time is timed, and if the timed duration is greater than the second preset duration, an alarm message is generated and the defrosting heater is turned off.

[0054] In this embodiment, a door status sensor (such as a Hall sensor or microswitch) is installed on the refrigerator door. Its signal output terminal is electrically connected to the controller to collect the door's open / closed status in real time. Simultaneously, the controller has a built-in timing module to record the cumulative duration of a single defrosting process. The second preset duration is set to 30 minutes. During defrosting, the controller continuously receives feedback signals from the door status sensor: if the door is detected as open, it immediately issues a command to pause the defrosting heater and freeze the current defrosting timer; after the sensor reports that the door is closed, the controller resumes the defrosting heater operation and continues the previous defrosting timer and process. At the same time, the timing module accumulates the defrosting time in real time. If this time exceeds 30 minutes, the controller immediately triggers a fault alarm (such as flashing the alarm light on the refrigerator panel and sounding a buzzer) and cuts off the power supply circuit to all defrosting heaters, stopping the defrosting operation.

[0055] The door status monitoring and defrost pause mechanism design prevents excessive heat loss from the defrost heater when the door is opened, reducing internal cold loss and energy waste. It also prevents external humid air from entering the refrigerator and accumulating with the defrost heat, thus preventing drastic temperature fluctuations and ensuring a stable food storage environment. The defrost time over-limit alarm and heater cut-off function effectively mitigate the risk of continuous heating caused by defrost heater malfunctions (such as short circuits in the heating wire or temperature sensor failure), preventing evaporator overheating or excessive internal temperature rise that could lead to safety hazards and improving refrigerator operational safety. This design enhances the safety control logic of the defrost process, covering special scenarios such as door malfunctions and equipment failures, making the defrost process more reliable and safe.

[0056] Secondly, please refer to Figure 1 This application provides an evaporator mechanism, including: Housing 1, with an air duct inside housing 1; Heat insulation board 2 divides the air duct into a first air duct 1a and a second air duct 1b, which are arranged side by side in the horizontal direction. The first evaporator 3 is connected to the housing 1 and located in the first air duct 1a; The second evaporator 4 is connected to the housing 1 and located in the second air duct 1b; The controller is electrically connected to the defrost heater and to the control valves on the first evaporator 3 and the second evaporator 4. The controller is used to execute the defrosting method provided in the first aspect of this application.

[0057] In one embodiment of this application, the evaporator mechanism is designed to adapt to the aforementioned defrosting method. Its structure and control logic are deeply integrated. Specifically, the shell 1 is integrally injection molded from flame-retardant ABS material, forming a through-type air duct inside. The cross-section of the air duct is rectangular to ensure smooth airflow. The heat insulation plate 2 is made of polyurethane foam heat insulation material and is fixed to the inner wall of the shell 1 along the horizontal centerline, rigidly dividing the air duct into a first air duct 1a and a second air duct 1b arranged side by side. The two air ducts are independently sealed and do not communicate with each other, blocking the conduction of heat between the air ducts. The first evaporator 3 and the second evaporator 4 are both finned evaporators, which are fixed to the inner wall of the corresponding air duct of the shell 1 by a snap-fit ​​structure. The fin spacing is adapted to the airflow speed of the air duct, and the first and second evaporators 4 correspond to two independent compartments of the refrigerator, such as the first evaporator 3 corresponding to the freezer compartment and the second evaporator 4 corresponding to the temperature compartment. The defrosting heaters use heating elements, which are respectively attached and fixed to the fin roots of the first and second evaporators 4, making close contact with the evaporator surface to improve heat transfer efficiency. Electronic expansion valves are used as control valves, connected in series in the refrigerant input lines of the first evaporator 3 and the second evaporator 4, for independently controlling the refrigerant on / off and flow regulation of each evaporator. The controller uses an MCU microcontroller, electrically connected to the two defrosting heaters and two electronic expansion valves via wires. It also provides signal interfaces for the frost thickness detection module, temperature sensor, and fan in the refrigerator compartments. The controller has a built-in program for the aforementioned defrosting method, can receive real-time data from the detection module, and automates the process of determining the target compartment, controlling the refrigerant on / off, cooling adjacent compartments, dynamic defrosting, drying residual water, and refrigerant recovery by controlling the opening of the electronic expansion valves, the start / stop and temperature regulation of the defrosting heaters, and the operation of the fan. This application adopts a horizontally arranged dual-duct structure, combined with the rigid separation of polyurethane insulation board 2, to achieve physical isolation and independent duct design of the first and second evaporators 4. Structurally, it blocks the heat transfer from the target duct to the adjacent duct during the defrosting process, providing a structural basis for active cooling of adjacent compartments and solving the problem of heat crosstalk in traditional evaporator layouts. The first and second evaporators 4 are independently equipped with defrosting heaters and electronic expansion valves, and are deeply integrated with the defrosting method through the controller, which can realize independent defrosting control and refrigerant flow regulation of the two evaporators, perfectly adapting to the core needs of targeted defrosting and cooling of adjacent compartments, avoiding the drawbacks of whole-unit shutdown for defrosting. The sealing design of the shell 1 and insulation board 2, and the compatible installation of the evaporator and duct, ensure airflow circulation efficiency. Combined with the blower drying step after defrosting, defrosting water can be quickly discharged, further preventing residual water from freezing and secondary frosting. At the same time, the integrated control of the controller reduces signal interference between components and improves the stability and accuracy of the defrosting process.

[0058] Thirdly, please refer to Figures 1 to 4 This application provides a refrigerator, comprising: The refrigerator body has a first compartment and a second compartment. The evaporator mechanism provided in the second aspect of this application includes a first evaporator 3 and a second evaporator 4, which are used to cool the first compartment and the second compartment, respectively.

[0059] In this embodiment, the refrigerator includes a refrigerator body with an insulation layer and the aforementioned evaporator mechanism. The refrigerator body is divided into an independent and sealed first compartment and a second compartment. The first evaporator 3 and the second evaporator 4 of the evaporator mechanism are connected to the refrigerator's main refrigeration circuit through independent refrigerant pipelines, corresponding to the first compartment and the second compartment for refrigeration. The first air duct 1a and the second air duct 1b where the two evaporators are located are completely separated by a heat insulation plate 2, and the air outlets of the air ducts are precisely connected to the air supply channels of the two compartments respectively. Both the first and second compartments are equipped with frost thickness detection modules and temperature sensors. The detection signals are transmitted to the controller of the evaporator mechanism, and the controller has a built-in defrosting method program. The refrigeration and defrosting systems of the two compartments of this refrigerator are completely independent. The heat insulation plate 2 blocks the conduction of defrosting heat from the target compartment to the adjacent compartment. Combined with the active cooling strategy of the adjacent compartment, the temperature fluctuation of the adjacent compartment during defrosting can be controlled within ±1℃. This effectively avoids the pain point of repeated freezing and thawing of food during defrosting in traditional refrigerators and greatly improves the preservation quality. The dynamic temperature adjustment of the defrosting heater and the drying of defrosting water prevent residual ice on the evaporator and secondary frost formation, reduce wind resistance and energy consumption, and eliminate the need to shut down the entire unit for defrosting, ensuring the refrigerator's continuous cooling capacity and extending the service life of core components such as the compressor and evaporator.

[0060] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0061] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0062] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A defrosting method for a refrigerator, the refrigerator comprising at least two compartments, each compartment corresponding to an evaporator, and a heat insulation plate disposed between adjacent evaporators, the refrigerator further comprising: A defrosting heater connected to each evaporator, characterized in that the method comprises the following steps: Identify the target room in at least two compartments; If the frost thickness in the target compartment meets the preset thickness condition, the refrigerant flow in the evaporator corresponding to the target compartment is stopped. The evaporator of the adjacent room next to the target room is controlled to cool down the adjacent room, and the defrost heater is controlled to heat the evaporator of the target room so that the evaporator of the target room is heated. The temperature of the evaporator in the target chamber is detected to determine whether the temperature of the evaporator in the target chamber meets the preset temperature condition. If the preset temperature condition is met, the defrosting heater stops heating the evaporator of the target compartment, and the refrigerant flow in the evaporator corresponding to the target compartment is restored.

2. The defrosting method according to claim 1, characterized in that, The method of controlling the evaporator of the adjacent compartment to cool the adjacent compartment and controlling the defrost heater to heat the evaporator of the target compartment includes: Detect the temperature of the adjacent rooms; The temperature reduction value of the adjacent room is determined based on the frost thickness of the target room; Increase the refrigerant flow rate based on the current refrigerant flow rate of the evaporator in the adjacent compartment; When the temperature of the adjacent compartment drops below the set temperature, the current refrigerant flow rate of the evaporator in the adjacent compartment is restored.

3. The defrosting method according to claim 2, characterized in that, Determining the temperature drop value of the adjacent compartment based on the frost thickness of the target compartment includes: Calculate the estimated defrosting temperature and estimated defrosting time corresponding to the thickness of the frost layer; Calculate the estimated defrosting heat accumulation value based on the estimated defrosting temperature and estimated defrosting time; Obtain the heat transfer coefficient between the target room and the adjacent room; The estimated temperature rise of the adjacent room is calculated based on the estimated cumulative defrosting heat value and the heat transfer coefficient, and the estimated temperature rise value is added to the preset temperature margin to obtain the temperature drop value.

4. The defrosting method according to claim 3, characterized in that, The method further includes: obtaining the frost thickness of the adjacent compartments; Calculate the difference between the frost thickness of the adjacent compartment and the thickness threshold. The difference is multiplied by a preset negative factor to obtain the preset temperature margin.

5. The defrosting method according to claim 1, characterized in that, Determining whether the temperature of the evaporator in the target compartment meets the preset temperature condition includes: Determine whether the temperature of the evaporator in the target chamber after the temperature rises is greater than a preset temperature value; If the temperature of the evaporator in the target chamber rises above a preset temperature value, determine whether the temperature of the evaporator in the target chamber remains above the preset temperature value for a first preset duration. If the temperature of the evaporator in the target chamber remains above the preset temperature value for a first preset duration, the preset temperature condition is determined to be met.

6. The defrosting method according to claim 1, characterized in that, The step of identifying the target room among at least two rooms includes: Obtain the frost thickness of each compartment and the space type of each compartment, including: freezing type and refrigeration type; When there is only one compartment where the frost thickness is greater than the preset thickness threshold, the compartment with the frost thickness greater than the preset thickness threshold is identified as the target compartment. When two or more frost layers have a thickness greater than a preset thickness threshold, the room with the space type of freezing is selected as the target room.

7. The defrosting method according to claim 1, characterized in that, The control of the defrosting heater to heat the evaporator of the target compartment includes: The frost thickness of the target compartment is obtained, and the temperature of the defrosting heater corresponding to the evaporator of the target compartment is adjusted according to the frost thickness. The temperature of the defrosting heater gradually increases as the frost thickness increases.

8. The defrosting method according to claim 1, characterized in that, Each of the evaporators is equipped with a fan; Before restoring the refrigerant flow in the evaporator corresponding to the target compartment, the following steps are also included: Turn on the fan corresponding to the target room to blow away the defrost water generated on the evaporator of the target room; Determine whether the operating time of the fan is greater than a preset time. If the operating time is greater than the preset time, shut down the fan and execute the step of restoring the refrigerant flow in the evaporator corresponding to the target room.

9. The defrosting method according to claim 1, characterized in that, Each of the aforementioned rooms is provided with a corresponding door, and the method includes: While controlling the defrosting heater to heat the evaporator of the target compartment, the state of the door of the target compartment is detected; If the door of the target room changes from closed to open, heating of the evaporator in the target room will stop. When heating of the evaporator in the target chamber is stopped, if the door of the target chamber switches from the open state to the closed state, then heating of the evaporator in the target chamber continues. Alternatively, when controlling the defrosting heater to heat the evaporator of the target compartment, the heating time is timed, and if the timed duration is greater than a second preset duration, an alarm message is generated and the defrosting heater is turned off.

10. An evaporator mechanism, characterized in that, include: A housing (1) having an air duct inside; The heat insulation board (2) divides the air duct into a first air duct (1a) and a second air duct (1b), which are arranged side by side in the horizontal direction. The first evaporator (3) is connected to the housing (1) and located in the first air duct (1a); The second evaporator (4) is connected to the housing (1) and located in the second air duct (1b); The controller is electrically connected to the defrost heater and to the control valves on the first evaporator (3) and the second evaporator (4), and the controller performs the defrosting method according to any one of claims 1-9.

11. A refrigerator, characterized in that, include: The refrigerator body has a first compartment and a second compartment. The evaporator mechanism as claimed in claim 10, wherein the first evaporator (3) and the second evaporator (4) are respectively used to cool the first compartment and the second compartment.

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