Refrigerator defrosting device and control method thereof
By designing a defrost device including a defrost heater, a semiconductor module and a controller in the refrigerator, the problems of long defrost process and large heating power consumption of the air-cooled refrigerator are solved, and efficient and accurate defrost operation is achieved, improving the quality of food preservation and reducing energy consumption.
Patent Information
- Application Number
- CN202510410302.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-02
- Publication Date
- 2025-06-06
AI Technical Summary
The defrosting process of air-cooled refrigerators is long and the heating power consumption is large, which leads to fluctuations in the room temperature and affects the quality of food preservation.
A refrigerator defrosting device is designed, including a defrosting heater, a semiconductor module and a controller. By setting a defrosting temperature sensor in the inlet or outlet pipe section of the evaporator and a room temperature sensor in the room, the controller collects temperature data in real time, and accurately controls the opening and closing of the defrosting heater and semiconductor module.
It realizes efficient and precise operation of the defrost process, shortens the defrost time, reduces the room temperature rebound, improves the quality of food preservation, and reduces energy consumption.
Smart Images
Figure CN120101392A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of refrigerators, and in particular to a refrigerator defrosting device and a control method thereof. Background Art
[0002] The refrigerator refrigeration system is a key device to ensure the freshness of food. Its core component, the evaporator, exchanges heat with the air in the compartment, lowers the compartment temperature and deposits water vapor to form frost. In air-cooled refrigerators, the finned evaporator is an important component for achieving efficient refrigeration, but frost on its surface will reduce the heat exchange efficiency, so it needs to be defrosted regularly. How to complete the defrosting process efficiently and quickly while avoiding the impact of compartment temperature fluctuations on food preservation has become an important requirement in the design of air-cooled refrigerators.
[0003] In the related art, defrosting of air-cooled refrigerators mainly adopts electric heater devices, such as steel tube heaters, which are usually arranged at the bottom of the evaporator. During defrosting, the heater is powered on to heat up, and the frost layer on the surface of the evaporator is gradually melted by heat radiation and convection. This solution relies on the heat transfer of the heater, and defrosts from the bottom of the evaporator upwards. It takes a long time for the temperature of the entire evaporator to rise evenly to above the freezing point.
[0004] However, the above defrosting method has obvious shortcomings: because the heater is located at the bottom of the evaporator, the heat transfer is slow, resulting in low defrosting efficiency on the upper part of the evaporator, a long overall defrosting time and high energy consumption. At the same time, hot air easily penetrates into the compartment during the defrosting process, causing the compartment temperature to rise, affecting the quality of food preservation; and more energy is consumed to cool down during re-refrigeration, further increasing the energy consumption of the refrigerator. Therefore, there is an urgent need for a defrosting device and control method that can speed up the defrosting speed and reduce compartment temperature fluctuations. Summary of the invention
[0005] The present application provides a refrigerator defrosting device and a control method thereof to solve the problem that the defrosting process takes a long time and consumes a lot of heating power.
[0006] In a first aspect, the present application provides a refrigerator defrosting device, comprising a refrigerator liner, an evaporator, a defrosting heater, an air duct system, a semiconductor module, and a controller;
[0007] Wherein, the evaporator is arranged between the refrigerator inner tank and the rear side wall of the air duct of the air duct system, and the defrost heater is arranged at the lower part of the evaporator; a refrigeration air duct is formed between the refrigerator inner tank and the rear side wall of the air duct;
[0008] The refrigeration air duct includes an air supply air duct and a plurality of air outlets, the air supply air duct is located between the front side wall of the air duct system and the rear side wall of the air duct, and the air outlets are opened on the front side wall of the air duct;
[0009] The semiconductor module is arranged in the middle of the cooling air duct, a semiconductor cooling sheet is arranged in the semiconductor module, a hot end of the semiconductor cooling sheet is located in the cooling air duct, and a cold end of the semiconductor cooling sheet is located in the air supply air duct;
[0010] The inlet or outlet pipe section of the evaporator is provided with a defrost temperature sensor, the compartment temperature sensor is provided in the compartment, and the controller is respectively connected to the evaporator, the defrost heater, the semiconductor module, the defrost temperature sensor and the compartment temperature sensor for communication; the controller is configured as follows:
[0011] Control the defrost temperature sensor and compartment temperature sensor to collect the evaporator temperature and compartment temperature in real time;
[0012] When the difference between the compartment temperature and the temperature at the start of defrosting is less than a preset temperature rise threshold, and the evaporator temperature is less than a preset evaporator temperature threshold, the defrost heater and the semiconductor module are controlled to turn on;
[0013] When the difference between the compartment temperature and the temperature at the start of defrosting reaches a preset temperature rise threshold, the defrost heater is controlled to be turned off;
[0014] When the evaporator temperature reaches a preset evaporator temperature threshold, the defrost heater and the semiconductor module are controlled to be turned off.
[0015] The refrigerator defrosting device is provided with a defrosting temperature sensor at the inlet or outlet pipe section of the evaporator, and a compartment temperature sensor in the compartment, and the controller is connected to the evaporator, the defrosting heater, the semiconductor module, and the two sensors for communication. The controller can collect the temperature of the evaporator and the compartment in real time, and accurately control the opening and closing of the defrosting heater and the semiconductor module according to the temperature difference between the compartment temperature and the defrosting start time and the evaporator temperature, so as to realize efficient and accurate defrosting operation. It can not only speed up the defrosting process of the evaporator, but also effectively reduce the rise of the compartment temperature, realize the constant temperature effect of the freezing compartment, effectively improve the food preservation time and quality, and solve the problem of long defrosting process time and high heating power consumption.
[0016] Optionally, the semiconductor module further includes a cooling block and a heat sink fin; the cold end of the semiconductor refrigeration plate is in contact with the cooling block, and the cooling block is located in the air supply duct; the cooling block is in contact with the heat sink fin, and the heat sink fin is located in the compartment.
[0017] The semiconductor module forms an efficient heat conduction path by providing a cooling block and a heat sink fin, and making the cold end of the semiconductor refrigeration plate close to the cooling block, the cooling block close to the heat sink fin, and the heat sink fin located in the compartment. This structural design not only accelerates the heat transfer process from the semiconductor refrigeration plate through the cooling block to the heat sink fin and then to the compartment, but also significantly improves the refrigeration efficiency and heat exchange effect. This helps to maintain a more stable low-temperature environment in the refrigerator compartment, reduce energy consumption, extend the food preservation time, improve user experience, and enhance the overall reliability and durability of the refrigerator.
[0018] Optionally, a mounting hole is provided in the middle of the refrigeration duct, and the semiconductor module is fixedly connected to the refrigeration duct through the mounting hole; a refrigeration return air port is provided at the bottom of the refrigeration duct, so that the humid air in the compartment is cooled by the evaporator and then sent back to the compartment through the air duct system.
[0019] The semiconductor module is firmly connected to the refrigeration duct through the mounting hole, ensuring the stability and reliability of the equipment operation. At the same time, the setting of the refrigeration return air outlet cleverly guides the humid air in the compartment to be cooled by the evaporator and then sent back to the compartment through the duct system, forming an efficient air circulation and humidity control mechanism. This process not only effectively reduces the temperature and humidity in the compartment, but also significantly improves the refrigeration efficiency and speed, ensuring the constancy and suitability of the internal environment of the refrigerator, and providing a strong guarantee for the long-term preservation of food. In addition, the structure also optimizes the air flow path, reduces energy consumption and noise, and further enhances the user experience and energy-saving performance of the refrigerator.
[0020] Optionally, a compressor is further included; the compressor is connected to the evaporator, and the controller is in communication connection with the compressor; the controller is configured as follows:
[0021] When the refrigerator refrigeration operation time reaches the preset time threshold, the command to enter the defrosting stage is executed;
[0022] Controlling the compressor to stop running according to the instruction of entering the defrost stage;
[0023] When the defrost heater and the semiconductor module are turned off, a refrigerator refrigeration instruction is executed;
[0024] The compressor is controlled to start running according to the refrigerator refrigeration instruction.
[0025] The refrigerator defrosting device introduces a compressor and connects it to the evaporator, which is intelligently controlled by the controller to achieve efficient switching between the refrigeration and defrosting stages. When the refrigerator reaches the preset refrigeration time, the defrosting program is automatically started, the compressor is turned off, and the defrosting heater and semiconductor module are turned off to ensure that the defrosting process proceeds smoothly. After defrosting is completed, the system automatically resumes the refrigeration mode and restarts the compressor to ensure a constant temperature environment inside the refrigerator.
[0026] Optionally, the evaporator is a fin-tube evaporator; a fan is arranged on the top of the evaporator, and an air outlet end of the fan faces the air supply duct.
[0027] The fan is arranged on the top of the evaporator, and the design of the fan outlet facing the air supply duct greatly enhances the air circulation and heat exchange efficiency inside the refrigerator. The airflow generated by the operation of the fan effectively accelerates the heat exchange between the evaporator surface and the air in the compartment, making the refrigeration process faster and more uniform, which not only improves the refrigeration speed, but also ensures the temperature balance of each area in the refrigerator. This configuration also promotes the formation and discharge of condensed water on the evaporator surface, reducing the possibility of frost accumulation.
[0028] Optionally, the defrost heater adopts a steel tube heater, and the rated power of the steel tube heater is 100W-250W.
[0029] The defrost heater uses a steel tube heater with a rated power of 100W-250W, which ensures that the defrosting process is both efficient and energy-saving, can quickly remove frost on the surface of the evaporator, shorten the defrosting cycle, and thus reduce the impact on the normal refrigeration operation of the refrigerator. At the same time, the steel tube material has good heat resistance and corrosion resistance, which ensures the stability and safety of the heater during long-term use. In addition, the design also optimizes the heat distribution, making the defrosting more uniform and thorough, effectively preventing the reduction in refrigeration efficiency or the generation of odors that may be caused by incomplete defrosting, and providing users with a healthier and more reliable food storage environment.
[0030] Optionally, the heat dissipation fins include a plurality of fins; the plurality of fins are arranged in a wave shape, and a distance between adjacent fins is 2-5 mm.
[0031] The heat dissipation fins are designed with multiple wave-shaped arrangements, and the spacing between adjacent fins is maintained between 2-5mm. This structural design significantly enhances the heat dissipation performance and air circulation efficiency of the refrigerator. The wave-shaped arrangement not only increases the heat dissipation area, but also promotes turbulent mixing of air, allowing heat to be transferred from the heat source to the surrounding environment more quickly. At the same time, the moderate fin spacing ensures smooth air circulation while avoiding increased wind resistance and energy consumption caused by too dense fins.
[0032] A second aspect of the present application provides a refrigerator defrosting control method, which is applied to the refrigerator defrosting device according to the first aspect, and the method comprises:
[0033] Control the defrost temperature sensor and compartment temperature sensor to collect the evaporator temperature and compartment temperature in real time;
[0034] When the difference between the compartment temperature and the temperature at the start of defrosting is less than a preset temperature rise threshold, and the evaporator temperature is less than a preset evaporator temperature threshold, the defrost heater and the semiconductor module are controlled to turn on;
[0035] When the difference between the compartment temperature and the temperature at the start of defrosting reaches a preset temperature rise threshold, the defrost heater is controlled to be turned off;
[0036] When the evaporator temperature reaches a preset evaporator temperature threshold, the defrost heater and the semiconductor module are controlled to be turned off.
[0037] The refrigerator defrosting control method realizes intelligent optimization of the defrosting process by precisely regulating the operation of the defrosting heater and the semiconductor module. It monitors the temperature changes of the compartment and the evaporator in real time, ensuring that the defrosting device is started and shut down under appropriate temperature rise thresholds and temperature conditions, thereby avoiding energy waste and ensuring thorough defrosting. This refined temperature management not only improves the defrosting efficiency of the refrigerator, but also reduces the problem of decreased refrigeration effect caused by excessive or insufficient defrosting.
[0038] Optionally, the step of controlling the defrost temperature sensor and the compartment temperature sensor to collect the evaporator temperature and the compartment temperature in real time includes:
[0039] When the refrigerator refrigeration operation time reaches the preset time threshold, the command to enter the defrosting stage is executed;
[0040] The compressor is controlled to stop running according to the instruction of entering the defrost stage, and the defrost temperature sensor and the compartment temperature sensor are controlled to collect the evaporator temperature and the compartment temperature in real time.
[0041] By automatically triggering the defrost stage when the refrigerator's refrigeration operation reaches a preset time threshold and simultaneously shutting down the compressor, the defrost process can be accurately started and energy consumption optimized.
[0042] Optionally, the method further includes:
[0043] When the defrost heater and the semiconductor module are turned off, a refrigerator refrigeration instruction is executed;
[0044] The compressor is controlled to start running according to the refrigerator refrigeration instruction.
[0045] After the defrost heater and semiconductor module are turned off, the refrigerator refrigeration command is executed and the compressor is started, realizing the seamless switch from defrosting to refrigeration. This design not only improves the operating efficiency of the refrigerator, but also ensures the rapid recovery and stability of the internal temperature of the refrigerator by accurately controlling the start and stop of the compressor, thereby effectively extending the freshness of food. At the same time, this mechanism reduces the impact of the defrosting process on the overall performance of the refrigerator and reduces energy consumption.
[0046] It can be seen from the above technical scheme that the present application provides a refrigerator defrosting device and a control method thereof, the device comprising a refrigerator liner, an evaporator, a defrosting heater, an air duct system, a semiconductor module and a controller; the evaporator is arranged between the refrigerator liner and the rear side wall of the air duct of the air duct system, and the defrosting heater is arranged at the lower part of the evaporator; a refrigeration air duct is formed between the refrigerator liner and the rear side wall of the air duct; the refrigeration air duct comprises an air supply duct and a plurality of air outlets, the air supply duct is located between the front side wall of the air duct of the air duct system and the rear side wall of the air duct, and the air outlet is opened on the front side wall of the air duct; the semiconductor module It is arranged in the middle of the refrigeration duct, a semiconductor refrigeration sheet is arranged in the semiconductor module, the hot end of the semiconductor refrigeration sheet is located in the refrigeration duct, and the cold end of the semiconductor refrigeration sheet is located in the air supply duct; a defrost temperature sensor is arranged on the inlet or outlet pipe section of the evaporator, and a compartment temperature sensor is arranged in the compartment; the controller is respectively communicated with the evaporator, the defrost heater, the semiconductor module, the defrost temperature sensor and the compartment temperature sensor; the controller controls the opening and closing of the defrost heater and the semiconductor module through the evaporator temperature and the compartment temperature to solve the problem that the defrost process takes a long time and has a large heating power consumption. BRIEF DESCRIPTION OF THE DRAWINGS
[0047] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0048] Figure 1 A schematic diagram of the structure of a refrigerator defrosting device provided in an embodiment of the present application;
[0049] Figure 2 A schematic diagram of the cross-sectional structure of the refrigerator defrosting device at point BB provided in an embodiment of the present application;
[0050] Figure 3 A schematic flow chart of a refrigerator defrost control method provided in an embodiment of the present application.
[0051] Illustration Description:
[0052] Among them, 1-refrigerator liner, 2-evaporator, 3-defrost heater, 4-air duct system, 41-rear side wall of air duct, 42-front side wall of air duct, 5-semiconductor module, 51-semiconductor refrigeration plate, 52-cooling block, 53-heat dissipation fin, 6-defrost temperature sensor, 7-chamber temperature sensor. DETAILED DESCRIPTION
[0053] The embodiments will be described in detail below, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation methods described in the following embodiments do not represent all implementation methods consistent with the present application. They are only examples of systems and methods consistent with some aspects of the present application.
[0054] It should be noted that the brief description of terms in this application is only for the convenience of understanding the embodiments described below, and is not intended to limit the embodiments of this application. Unless otherwise specified, these terms should be understood according to their common and usual meanings.
[0055] The terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover but not exclude inclusion, for example, a product or device comprising a list of components is not necessarily limited to all the components expressly listed but may include other components not expressly listed or inherent to such product or device.
[0056] The refrigerator refrigeration system usually consists of an evaporator, a compressor, a condenser, an anti-condensation tube, a filter, and a capillary tube. The main function of the evaporator is that when the refrigerator is running, the refrigerant in the refrigerator evaporator absorbs the heat of the compartment for heat exchange to ensure that the compartment is in a low temperature state. In the current air-cooled refrigerator, the evaporator is mainly a finned evaporator, which is an important component of the refrigerator refrigeration system. The finned evaporator cools the compartment and exchanges heat with the air in the compartment to achieve the effect of cooling the compartment. The evaporator exchanges heat with the air in the compartment, which not only reduces the temperature of the compartment, but also cools the water vapor in the compartment and deposits it on the surface of the evaporator to form frost. Therefore, air-cooled refrigerators need to regularly defrost the evaporator.
[0057] In the relevant embodiments, an electric heater device is arranged at the lower part of the evaporator; when the evaporator is defrosted, the heater is powered on, the surface temperature of the heater gradually increases, and the frost layer on the surface of the evaporator is defrosted by surface radiation and convection generated by the air around the evaporator. Since the evaporator has a certain height and the heater is located at the bottom of the evaporator, the temperature of the finned evaporator gradually rises to above the freezing point from bottom to top during the defrosting process. The slow heating of the upper part of the evaporator causes the temperature of the entire evaporator to be uneven, and the entire defrosting process takes a long time and the heating power consumption is large; at the same time, when the evaporator is defrosted, the heater will heat the air in the space where the evaporator is set, and the heated air will cause convection, and a part of the hot air will penetrate into the interior of the compartment, causing the compartment temperature to rise, affecting the quality of food preservation; and when switching to refrigeration, a large amount of compressor cooling capacity is required to cool the evaporator, which further increases the energy consumption of the refrigerator.
[0058] To solve the above problems, see Figure 1-Figure 3 Some embodiments of the present application provide a refrigerator defrosting device, comprising a refrigerator liner 1, an evaporator 2, a defrosting heater 3, an air duct system 4, a semiconductor module 5 and a controller; wherein the evaporator 2 is arranged between the refrigerator liner 1 and the air duct rear side wall 41 of the air duct system 4, and the defrosting heater 3 is arranged at the lower part of the evaporator 2; a refrigeration air duct is formed between the refrigerator liner 1 and the air duct rear side wall 41;
[0059] The refrigeration air duct includes an air supply duct and a plurality of air outlets, the air supply duct is located between the front side wall 42 of the air duct and the rear side wall 41 of the air duct system 4, and the air outlet is opened on the front side wall 42 of the air duct; the semiconductor module 5 is arranged in the middle of the refrigeration air duct, and a semiconductor refrigeration sheet 51 is arranged in the semiconductor module 5, the hot end of the semiconductor refrigeration sheet 51 is located in the refrigeration air duct, and the cold end of the semiconductor refrigeration sheet 51 is located in the air supply duct; the inlet or outlet pipe section of the evaporator 2 is provided with a defrost temperature sensor 6, and the compartment temperature sensor 7 is provided in the compartment, and the controller is respectively communicated with the evaporator 2, the defrost heater 3, the semiconductor module 5, the defrost temperature sensor 6 and the compartment temperature sensor 7.
[0060] It should be understood that the evaporator 2, as the core heat exchange component of the refrigeration system, achieves cooling by absorbing the heat of the compartment through the refrigerant. The defrost temperature sensor 6 can monitor the temperature change of the evaporator 2 in real time, and the compartment temperature sensor 7 can monitor the temperature fluctuation of the food storage area to provide temperature feedback for the defrost stage. The controller can be a single-chip microcomputer for controlling the components connected thereto. The rear side wall 41 of the air duct refers to the side wall of the air duct system 4 close to the back plate of the refrigerator, and the front side wall 42 of the air duct refers to the side wall of the air duct system 4 away from the back plate of the refrigerator.
[0061] The controller is configured to:
[0062] Control the defrost temperature sensor 6 and the compartment temperature sensor 7 to collect the evaporator temperature and the compartment temperature in real time;
[0063] When the difference between the compartment temperature and the temperature at the start of defrosting is less than the preset temperature rise threshold, and the evaporator temperature is less than the preset evaporator temperature threshold, the defrost heater 3 and the semiconductor module 5 are controlled to turn on;
[0064] When the difference between the compartment temperature and the temperature at the start of defrosting reaches a preset temperature rise threshold, the defrost heater 3 is controlled to be turned off;
[0065] When the evaporator temperature reaches a preset evaporator temperature threshold, the defrost heater 3 and the semiconductor module 5 are controlled to be turned off.
[0066] It should be understood that the preset temperature rise threshold is set according to the actual preservation requirement, and the preset temperature rise threshold can be selected as +2°C or +3°C. The preset evaporator temperature threshold should be greater than the preset temperature rise threshold, and the preset evaporator temperature threshold can be selected as 8°C.
[0067] The refrigerator defrosting device is provided with a defrosting temperature sensor 6 in the inlet or outlet pipe section of the evaporator 2, a compartment temperature sensor 7 in the compartment, and the controller is connected to the evaporator 2, the defrosting heater 3, the semiconductor module 5, and the two sensors. The controller can collect the evaporator and compartment temperatures in real time, and accurately control the opening and closing of the defrosting heater 3 and the semiconductor module 5 according to the temperature difference between the compartment temperature and the defrosting start time and the evaporator temperature, so as to realize efficient and accurate defrosting operation. This not only effectively prevents the problem of decreased refrigeration efficiency and air duct blockage caused by untimely defrosting, but also avoids the energy waste caused by excessive defrosting, improves the overall operating energy efficiency of the refrigerator, and solves the problem of long defrosting time and high heating power consumption.
[0068] In some embodiments, the semiconductor module 5 also includes a cooling block 52 and a heat dissipation fin 53; the cold end of the semiconductor refrigeration plate 51 is in contact with the cooling block 52, and the cooling block 52 is located in the air supply duct; the cooling block 52 is in contact with the heat dissipation fin 53, and the heat dissipation fin 53 is located in the compartment.
[0069] The semiconductor module 5 forms an efficient heat conduction path by providing a cooling block 52 and a heat sink fin 53, and making the cold end of the semiconductor refrigeration plate 51 abut against the cooling block 52, the cooling block 52 abut against the heat sink fin 53, and the heat sink fin 53 is located in the compartment. This structural design not only accelerates the heat transfer process from the semiconductor refrigeration plate 51 to the heat sink fin 53 and then to the compartment via the cooling block 52, but also significantly improves the refrigeration efficiency and heat exchange effect. This helps to maintain a more stable low-temperature environment in the refrigerator compartment, reduce energy consumption, extend the food preservation time, improve user experience, and enhance the overall reliability and durability of the refrigerator.
[0070] In some embodiments, a mounting hole is provided in the middle of the refrigeration duct, and the semiconductor module 5 is fixedly connected to the refrigeration duct through the mounting hole; a refrigeration return air port is provided at the bottom of the refrigeration duct so that the humid air in the compartment is cooled by the evaporator 2 and then sent back to the compartment through the duct system 4.
[0071] The semiconductor module 5 is firmly connected to the refrigeration air duct through the mounting hole, ensuring the stability and reliability of the equipment operation. At the same time, the setting of the refrigeration return air port cleverly guides the humid air in the compartment to be cooled by the evaporator 2 and then sent back to the compartment through the air duct system 4, forming an efficient air circulation and humidity control mechanism. This process not only effectively reduces the temperature and humidity in the compartment, but also significantly improves the refrigeration efficiency and speed, ensures the constancy and suitability of the internal environment of the refrigerator, and provides a strong guarantee for the long-term preservation of food. In addition, the structure also optimizes the air flow path, reduces energy consumption and noise, and further enhances the user experience and energy-saving performance of the refrigerator.
[0072] In some embodiments, a compressor is further included; the compressor is connected to the evaporator 2, and the controller is in communication connection with the compressor; the controller is configured as follows:
[0073] When the refrigerator refrigeration operation time reaches the preset time threshold, the command to enter the defrosting stage is executed;
[0074] Controlling the compressor to stop running according to the instruction of entering the defrost stage;
[0075] When the defrost heater 3 and the semiconductor module 5 are turned off, the refrigerator refrigeration instruction is executed;
[0076] The compressor is controlled to start running according to the refrigerator refrigeration instruction.
[0077] The refrigerator defrosting device introduces a compressor and is connected to the evaporator 2, and is intelligently controlled by the controller to achieve efficient switching between the refrigeration and defrosting stages. When the refrigerator reaches the preset refrigeration time, the defrosting program is automatically started, the compressor is turned off, and the defrosting heater 3 and the semiconductor module 5 are turned off at the same time to ensure that the defrosting process proceeds smoothly. After the defrosting is completed, the system automatically resumes the refrigeration mode and restarts the compressor to ensure a constant temperature environment inside the refrigerator.
[0078] In some embodiments, the evaporator 2 is a fin-tube evaporator; a fan is disposed on the top of the evaporator 2, and an air outlet end of the fan faces the air supply duct.
[0079] The fan is arranged on the top of the evaporator 2, and the design of the fan outlet facing the air supply duct greatly enhances the air circulation and heat exchange efficiency inside the refrigerator. The airflow generated by the operation of the fan effectively accelerates the heat exchange between the surface of the evaporator 2 and the air in the compartment, making the refrigeration process faster and more uniform, which not only improves the refrigeration speed, but also ensures the temperature balance of each area in the refrigerator. This configuration also promotes the formation and discharge of condensed water on the surface of the evaporator 2, reducing the possibility of frost accumulation.
[0080] In some embodiments, the defrost heater 3 is a steel tube heater, and the rated power of the steel tube heater is 100W-250W.
[0081] The defrost heater 3 uses a steel tube heater with a rated power of 100W-250W, which ensures that the defrosting process is both efficient and energy-saving, can quickly remove frost on the surface of the evaporator 2, shorten the defrosting cycle, and thus reduce the impact on the normal refrigeration operation of the refrigerator. At the same time, the steel tube material has good heat resistance and corrosion resistance, which ensures the stability and safety of the heater during long-term use. In addition, the design also optimizes the heat distribution, making the defrosting more uniform and thorough, effectively preventing the reduction in refrigeration efficiency or the generation of odors that may be caused by incomplete defrosting, and providing users with a healthier and more reliable food storage environment.
[0082] In some embodiments, the heat dissipation fins 53 include a plurality of fins; the plurality of fins are arranged in a wave shape, and the distance between adjacent fins is 2-5 mm.
[0083] The heat dissipation fins 53 are designed with multiple wave-shaped arrangements, and the spacing between adjacent fins is maintained between 2-5 mm. This structural design significantly enhances the heat dissipation performance and air circulation efficiency of the refrigerator. The wave-shaped arrangement not only increases the heat dissipation area, but also promotes turbulent mixing of air, so that heat can be transferred from the heat source to the surrounding environment more quickly. At the same time, the moderate fin spacing ensures smooth air circulation while avoiding increased wind resistance and energy consumption caused by too dense fins.
[0084] See again Figure 3 Some embodiments of the present application also provide a refrigerator defrosting control method, which is applied to the refrigerator defrosting device described in the above embodiment, and the method includes:
[0085] S300: Control the defrost temperature sensor 6 and the compartment temperature sensor 7 to collect the evaporator temperature and the compartment temperature in real time.
[0086] S400: When the difference between the compartment temperature and the temperature at the start of defrosting is less than a preset temperature rise threshold, and the evaporator temperature is less than a preset evaporator temperature threshold, the defrost heater 3 and the semiconductor module 5 are controlled to turn on.
[0087] S500: When the difference between the compartment temperature and the temperature at the start of defrosting reaches a preset temperature rise threshold, the defrost heater 3 is controlled to be turned off.
[0088] S600: When the evaporator temperature reaches a preset evaporator temperature threshold, the defrost heater 3 and the semiconductor module 5 are controlled to be turned off.
[0089] It should be understood that when the difference between the compartment temperature and the temperature at the start of defrosting reaches the preset temperature rise threshold, the semiconductor module 5 continues to operate.
[0090] The refrigerator defrosting control method realizes intelligent optimization of the defrosting process by precisely regulating the operation of the defrosting heater 3 and the semiconductor module 5. It monitors the temperature changes of the compartment and the evaporator in real time, and ensures that the defrosting device is started and shut down under appropriate temperature rise thresholds and temperature conditions, which not only avoids energy waste but also ensures the thoroughness of defrosting. This refined temperature management not only improves the defrosting efficiency of the refrigerator, but also reduces the problem of decreased refrigeration effect caused by excessive or insufficient defrosting.
[0091] In some embodiments, the step of controlling the defrost temperature sensor 6 and the compartment temperature sensor 7 to collect the evaporator temperature and the compartment temperature in real time includes:
[0092] S100: When the refrigerator refrigeration operation time reaches a preset time threshold, an instruction to enter the defrosting stage is executed.
[0093] S200: Controlling the compressor to stop running according to the instruction to enter the defrost stage.
[0094] S300: Control the defrost temperature sensor 6 and the compartment temperature sensor 7 to collect the evaporator temperature and the compartment temperature in real time.
[0095] It should be understood that the controller has a built-in timing device, which controls the compressor to start running and synchronously calculates the refrigerator refrigeration operation time. The preset time threshold is a preset parameter in the refrigerator control system, which is used to determine how long the refrigerator needs to automatically enter the defrosting stage after the refrigeration operation. This time threshold is set based on factors such as the design of the refrigerator, the use environment, and the refrigeration load.
[0096] By automatically triggering the defrost stage when the refrigerator's refrigeration operation reaches a preset time threshold and simultaneously shutting down the compressor, the defrost process can be accurately started and energy consumption optimized.
[0097] In some embodiments, the method further comprises:
[0098] S700: When the defrost heater 3 and the semiconductor module 5 are turned off, a refrigerator refrigeration instruction is executed.
[0099] S800: Controlling the compressor to start running according to the refrigerator refrigeration instruction.
[0100] After the defrosting heater 3 and the semiconductor module 5 are turned off, the refrigerator refrigeration instruction is executed and the compressor is started to operate, realizing a seamless switch from the defrosting to the refrigeration stage of the refrigerator. This design not only improves the operating efficiency of the refrigerator, but also ensures the rapid recovery and stability of the temperature inside the refrigerator by accurately controlling the start and stop of the compressor, thereby effectively extending the freshness of food. At the same time, this mechanism reduces the impact of the defrosting process on the overall performance of the refrigerator and reduces energy consumption.
[0101] It can be seen from the above technical scheme that the embodiment of the present application provides a refrigerator defrosting device and a control method thereof, the device comprising a refrigerator liner 1, an evaporator 2, a defrost heater 3, an air duct system 4, a semiconductor module 5 and a controller; the evaporator 2 is arranged between the refrigerator liner 1 and the air duct rear side wall 41 of the air duct system 4, and the defrost heater 3 is arranged at the lower part of the evaporator 2; a refrigeration air duct is formed between the refrigerator liner 1 and the air duct rear side wall 41; the refrigeration air duct comprises an air supply duct and a plurality of air outlets, the air supply duct is located between the air duct front side wall 42 of the air duct system 4 and the air duct rear side wall 41, and the air outlet is opened on the air duct front side wall 42; the semiconductor module 5 The body module 5 is arranged in the middle of the refrigeration duct, and a semiconductor refrigeration sheet 51 is arranged in the semiconductor module 5. The hot end of the semiconductor refrigeration sheet 51 is located in the refrigeration duct, and the cold end of the semiconductor refrigeration sheet 51 is located in the air supply duct; a defrost temperature sensor 6 is arranged at the inlet or outlet pipe section of the evaporator 2, and a compartment temperature sensor 7 is arranged in the compartment; the controller is respectively communicated with the evaporator 2, the defrost heater 3, the semiconductor module 5, the defrost temperature sensor 6 and the compartment temperature sensor 7; the controller controls the defrost heater 3 and the semiconductor module 5 to turn on and off according to the evaporator temperature and the compartment temperature to solve the problem that the defrost process takes a long time and has a large heating power consumption.
[0102] Similar parts between the embodiments provided in this application can be referenced to each other. The specific implementation methods provided above are only a few examples under the general concept of this application and do not constitute a limitation on the protection scope of this application. For those skilled in the art, any other implementation methods expanded based on the scheme of this application without creative work belong to the protection scope of this application.
Claims
1. A refrigerator defrosting device, characterized in that: include: Refrigerator liner (1), evaporator (2), defrost heater (3), air duct system (4), semiconductor module (5) and controller; The evaporator (2) is arranged between the refrigerator inner tank (1) and the rear side wall (41) of the air duct of the air duct system (4), and the defrost heater (3) is arranged at the bottom of the evaporator (2); a refrigeration air duct is formed between the refrigerator inner tank (1) and the rear side wall (41) of the air duct; The refrigeration air duct comprises an air supply air duct and a plurality of air outlets, the air supply air duct is located between the air duct front side wall (42) and the air duct rear side wall (41) of the air duct system (4), and the air outlets are arranged on the air duct front side wall (42); The semiconductor module (5) is arranged in the middle of the refrigeration air duct, a semiconductor refrigeration sheet (51) is arranged in the semiconductor module (5), a hot end of the semiconductor refrigeration sheet (51) is located in the refrigeration air duct, and a cold end of the semiconductor refrigeration sheet (51) is located in the air supply air duct; The inlet or outlet pipe section of the evaporator (2) is provided with a defrost temperature sensor (6), the compartment temperature sensor (7) is provided in the compartment, and the controller is respectively connected to the evaporator (2), the defrost heater (3), the semiconductor module (5), the defrost temperature sensor (6) and the compartment temperature sensor (7) in communication; the controller is configured as follows: Controlling the defrosting temperature sensor (6) and the compartment temperature sensor (7) to collect the evaporator temperature and the compartment temperature in real time; When the difference between the compartment temperature and the temperature at the start of defrosting is less than a preset temperature rise threshold, and the evaporator temperature is less than a preset evaporator temperature threshold, the defrost heater (3) and the semiconductor module (5) are controlled to turn on; When the difference between the compartment temperature and the temperature at the start of defrosting reaches a preset temperature rise threshold, the defrosting heater (3) is controlled to be turned off; When the evaporator temperature reaches a preset evaporator temperature threshold, the defrost heater (3) and the semiconductor module (5) are controlled to be turned off.
2. The refrigerator defrosting device according to claim 1, characterized in that: The semiconductor module (5) further comprises a cooling block (52) and heat dissipation fins (53); The cold end of the semiconductor refrigeration plate (51) is in contact with the cooling block (52), and the cooling block (52) is located in the air supply duct; the cooling block (52) is in contact with the heat dissipation fins (53), and the heat dissipation fins (53) are located in the chamber.
3. The refrigerator defrosting device according to claim 1, characterized in that: A mounting hole is provided in the middle of the refrigeration air duct, and the semiconductor module (5) is fixedly connected to the refrigeration air duct through the mounting hole; a refrigeration return air port is provided at the bottom of the refrigeration air duct so that the humid air in the compartment is cooled by the evaporator (2) and then sent back to the compartment through the air duct system (4).
4. The refrigerator defrosting device according to claim 1, characterized in that: It also includes a compressor; the compressor is connected to the evaporator (2), and the controller is in communication connection with the compressor; the controller is configured as follows: When the refrigerator refrigeration operation time reaches the preset time threshold, the command to enter the defrosting stage is executed; Controlling the compressor to stop running according to the instruction of entering the defrost stage; When the defrosting heater (3) and the semiconductor module (5) are turned off, a refrigerator refrigeration instruction is executed; The compressor is controlled to start running according to the refrigerator refrigeration instruction.
5. The refrigerator defrosting device according to claim 1, characterized in that: The evaporator (2) is a fin-tube evaporator; a fan is arranged on the top of the evaporator (2), and the air outlet end of the fan faces the air supply duct.
6. The refrigerator defrosting device according to claim 1, characterized in that: The defrost heater (3) is a steel tube heater, and the rated power of the steel tube heater is 100W-250W.
7. The refrigerator defrosting device according to claim 2, characterized in that: The heat dissipation fins (53) include a plurality of fins; the plurality of fins are arranged in a wave shape, and the spacing between adjacent fins is 2-5 mm.
8. A refrigerator defrosting control method, characterized in that: The refrigerator defrosting device applied to any one of claims 1 to 7, the method comprising: Controlling the defrosting temperature sensor (6) and the compartment temperature sensor (7) to collect the evaporator temperature and the compartment temperature in real time; When the difference between the compartment temperature and the temperature at the start of defrosting is less than a preset temperature rise threshold, and the evaporator temperature is less than a preset evaporator temperature threshold, the defrost heater (3) and the semiconductor module (5) are controlled to turn on; When the difference between the compartment temperature and the temperature at the start of defrosting reaches a preset temperature rise threshold, the defrosting heater (3) is controlled to be turned off; When the evaporator temperature reaches a preset evaporator temperature threshold, the defrost heater (3) and the semiconductor module (5) are controlled to be turned off.
9. The refrigerator defrosting control method according to claim 8, characterized in that: The steps of controlling the defrosting temperature sensor (6) and the compartment temperature sensor (7) to collect the evaporator temperature and the compartment temperature in real time include: When the refrigerator refrigeration operation time reaches the preset time threshold, the command to enter the defrosting stage is executed; The compressor is controlled to stop running according to the instruction of entering the defrost stage, and the defrost temperature sensor (6) and the compartment temperature sensor (7) are controlled to collect the evaporator temperature and the compartment temperature in real time.
10. The refrigerator defrosting control method according to claim 9, characterized in that: The method further comprises: When the defrosting heater (3) and the semiconductor module (5) are turned off, a refrigerator refrigeration instruction is executed; The compressor is controlled to start running according to the refrigerator refrigeration instruction.