Refrigerator and defrosting control method thereof

Abstract

The invention provides a refrigerator and a defrosting control method thereof.The refrigerator comprises a refrigerating chamber, a freezing chamber, an evaporation chamber and a controller, and the controller is configured to respond to a defrosting instruction used for defrosting of an evaporator so as to control a freezing air return door and a freezing air supply door to be closed; a refrigeration air supply air door is controlled to be opened for first preset time; a refrigeration air supply air door is closed, and a defrosting heater is started; the evaporator temperature detected by a defrosting temperature sensor is obtained; and if the temperature of the evaporator is within the first preset temperature range, the defrosting heater is controlled to be closed, the refrigeration air supply air door is controlled to be opened, and the refrigeration fan is controlled to rotate reversely for second preset time. And after defrosting is finished, the fan rotates reversely, the refrigeration air supply air door is opened to introduce air flow of the refrigeration chamber into the evaporation chamber, and therefore defrosting hot air in the evaporation chamber is exhausted to the external environment, and the problem that the temperature of the freezing chamber rises again in the evaporator defrosting period is solved.

Description

Technical Field

[0001] The present application relates to the technical field of refrigeration equipment, and in particular to a refrigerator and a defrosting control method thereof. Background Art

[0002] An air-cooled refrigerator is a household appliance that uses air for refrigeration. Its working principle is to cool the air through the built-in evaporator, and then the fan blows the cold air to every corner of the refrigerator, forming a continuously circulating cold air system.

[0003] However, during the defrosting stage of the evaporator, the temperature of the freezer rises. Therefore, in order to address the impact of defrosting of air-cooled refrigerators on freshness preservation, a fan shielding device can be added to the evaporator room. When the freezer compartment of the refrigerator is defrosted, the shielding device is turned on to shield the fan around, so as to minimize the flow of evaporator defrosting heat into the freezer compartment. However, although the shielding device blocks the problem of defrosting hot steam flowing to the top of the freezer compartment to a certain extent, the temperature of the evaporator room is high after defrosting, and the refrigeration system needs to be started to cool the evaporator first before further refrigerating the refrigerator, which is not conducive to energy saving of the refrigerator. Another way is to add a cold storage device to the upper part of the freezer compartment where the temperature return is larger, store a certain amount of cold during the refrigeration stage, and use the stored cold during the defrosting stage to alleviate the temperature return of the top of the freezer during the defrosting stage, which can also play a certain role in freezing constant temperature. However, more cold needs to be stored during the refrigeration stage, which will still increase the energy consumption of the whole machine and is not conducive to energy saving.

[0004] Therefore, in some refrigerators, by controlling the fan to reverse at the end of defrosting, the cold air in the refrigeration room is introduced into the evaporator room through the air supply port on the upper part of the freezer to blow the hot air generated by defrosting out of the evaporator room, thereby cooling the evaporator and avoiding the consumption of cold energy in the initial refrigeration stage after defrosting, saving energy and reducing consumption. However, when the air supply port is opened and the fan is reversed, the hot air from the outside environment will pass through the freezer door seal and the air supply port of the freezer to enter the evaporator room in the opposite direction, and drain from the freezer. During the air flow balance process, relatively high-humidity air will be introduced from the outside environment into the freezer, causing the temperature of the upper part of the freezer to rise. At the same time, the high-humidity air from the outside is more likely to condense and frost locally in the freezer, further exacerbating the temperature rise at the top of the freezer and worsening the constant temperature preservation effect of the freezer. Summary of the invention

[0005] The present application provides a refrigerator and a defrost control method thereof to solve the problem of temperature rise in a freezing chamber during defrosting of an evaporator.

[0006] In a first aspect, the present application provides a refrigerator, comprising:

[0007] Cold room;

[0008] Freezer;

[0009] An evaporation chamber, wherein an evaporator, a defrost temperature sensor, a defrost heater and a refrigeration fan are arranged in the evaporation chamber;

[0010] The refrigerating chamber and the freezing chamber are both connected to the evaporating chamber through an air duct assembly;

[0011] The refrigerating chamber is provided with a refrigerating air supply damper, and the freezing chamber is provided with a freezing air supply damper and a freezing air return damper;

[0012] A controller, wherein the controller is respectively connected to the evaporator, the defrost temperature sensor, the defrost heater, the refrigeration fan, the refrigeration air supply damper, the freezing air supply damper, and the freezing return air damper;

[0013] The controller is configured as:

[0014] In response to a defrost instruction for defrosting the evaporator, the refrigerated return air damper and the refrigerated supply air damper are controlled to be closed; and the refrigerated supply air damper is controlled to be opened for a first preset time;

[0015] Close the refrigeration air supply damper and turn on the defrost heater;

[0016] Acquiring the evaporator temperature detected by the defrost temperature sensor;

[0017] If the evaporator temperature is within a first preset temperature range, the defrost heater is controlled to be turned off, the refrigeration air supply damper is controlled to be opened, and the refrigeration fan is controlled to be reversed for a second preset time.

[0018] Optionally, it also includes a defrost drain pipe and a water receiving tray, wherein the defrost drain pipe is connected to the evaporation chamber, one end of the defrost drain pipe is connected to the evaporator, and the other end of the defrost water receiving pipe is arranged in the water receiving tray.

[0019] Optionally, a sealing cover is provided at one end of the defrost drain pipe close to the water receiving tray; the sealing cover is hinged to the defrost drain pipe;

[0020] The sealing cover is used for rotating in a direction away from the defrost drain pipe when the internal air pressure of the defrost drain pipe is greater than the external air pressure.

[0021] Optionally, a compressor is further included, the compressor is connected to the controller, and the controller is further configured as:

[0022] Get the compressor running time;

[0023] If the compressor operation time is greater than the preset operation time, the defrost instruction is generated.

[0024] Optionally, the controller is further configured to:

[0025] Acquiring the evaporator temperature detected by the defrost temperature sensor;

[0026] If the evaporator temperature is within a second preset temperature range, the defrost instruction is generated.

[0027] Optionally, a temperature sensor is further included; the temperature sensor is used to detect the temperature of the evaporation chamber;

[0028] After controlling the refrigeration fan to reverse for a second preset time, the controller is further configured to:

[0029] Acquiring the evaporation chamber temperature detected by the temperature sensor;

[0030] If the temperature of the evaporation chamber is lower than the preset evaporation temperature, the refrigeration fan is controlled to rotate forward, the refrigeration air supply damper is controlled to open, and the refrigeration return air damper is controlled to open.

[0031] Optionally, the surface of the evaporator is coated with a hydrophobic coating, and the air duct assembly is provided with a thermal insulation layer.

[0032] In a second aspect, the present application provides a refrigerator defrosting control method, which is applied to the refrigerator described in the first aspect, comprising:

[0033] In response to a defrost instruction for defrosting the evaporator, the refrigeration return air damper and the refrigeration supply air damper are controlled to be closed; and the refrigeration supply air damper is controlled to be opened for a first preset time;

[0034] Close the refrigerated air supply damper and turn on the defrost heater;

[0035] Get the evaporator temperature detected by the defrost temperature sensor;

[0036] If the evaporator temperature is within a first preset temperature range, the defrost heater is controlled to be turned off, the refrigeration air supply damper is controlled to be opened, and the refrigeration fan is controlled to be reversed for a second preset time.

[0037] Optionally, the method further includes:

[0038] Get the compressor running time;

[0039] Acquiring the evaporator temperature detected by the defrost temperature sensor;

[0040] If the compressor operation time is greater than the preset operation time or the evaporator temperature is within a second preset temperature range, the defrost instruction is generated.

[0041] Optionally, after controlling the refrigeration fan to reverse for a second preset time, the method further includes:

[0042] Obtaining the evaporation chamber temperature detected by the temperature sensor;

[0043] If the temperature of the evaporation chamber is lower than the preset evaporation temperature, the refrigeration fan is controlled to rotate forward, the refrigeration air supply damper is controlled to open, and the refrigeration return air damper is controlled to open.

[0044] It can be seen from the above technical scheme that the present application provides a refrigerator and a defrost control method thereof, wherein the refrigerator comprises a refrigerating chamber; a freezing chamber; an evaporating chamber, wherein an evaporator, a defrosting temperature sensor, a defrosting heater and a refrigerating fan are arranged in the evaporating chamber; the refrigerating chamber and the freezing chamber are both connected to the evaporating chamber through an air duct component; the refrigerating chamber is provided with a refrigerating air supply damper, and the freezing chamber is provided with a freezing air supply damper and a freezing return air damper; a controller, wherein the controller is respectively connected to the evaporator, the defrosting temperature sensor, the defrosting heater, the refrigerating fan, the refrigerating air supply damper The air door, the refrigerated air supply air door, and the refrigerated air return air door are connected; the controller is configured to: respond to the defrosting instruction for evaporator defrosting to control the refrigerated return air door and the refrigerated air supply air door; control the refrigerated air supply air door to open for a first preset time; close the refrigerated air supply air door and turn on the defrost heater; obtain the evaporator temperature detected by the defrost temperature sensor; if the evaporator temperature is within the first preset temperature range, control the defrost heater to close, control the refrigerated air supply air door to open, and control the refrigeration fan to reverse for a second preset time. The evaporator closes the refrigerated air supply air door, the refrigerated air return air door, and the refrigerated air supply air door during the defrosting stage, which can isolate the hot air generated by defrosting heating from the freezing chamber and the refrigerating chamber to the maximum extent, and reduce the temperature rise of the freezing chamber during the defrosting period; after the defrosting is completed, the fan reverses, and the refrigerated air supply air door is opened to introduce the airflow of the refrigerating chamber into the evaporating chamber, so as to discharge the defrosting hot air in the evaporating chamber to the external environment, so as to solve the problem of temperature rise of the freezing chamber during the defrosting period of the evaporator. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] 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.

[0046] Figure 1 A schematic diagram of the refrigerator structure provided in an embodiment of the present application;

[0047] Figure 2 A flow chart of a refrigerator defrost control method provided in an embodiment of the present application.

[0048] Reference numerals:

[0049] Among them, 1-freezer; 2-refrigerator; 3-air duct assembly; 31-refrigerator supply air damper; 32-refrigerator return air damper; 33-insulation layer; 41-refrigerator supply air damper; 5-refrigeration fan; 6-defrost temperature sensor; 7-evaporator; 8-defrost heater; 9-defrost drain pipe; 91-sealing cover; 10-water tray; 11-controller; 12-evaporation chamber. DETAILED DESCRIPTION

[0050] The following embodiments are described in detail, 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 implementations described in the following embodiments do not represent all implementations consistent with the present application. They are only examples of systems and methods consistent with some aspects of the present application as detailed in the claims.

[0051] The refrigerator provided in the embodiment of the present application is a refrigeration device, which at least includes a refrigeration system, a cooling system, a control system and a cabinet to achieve refrigeration and operation. Among them, the refrigeration system is used to produce a refrigeration effect, the cooling system is used to maintain a low temperature environment, the control system is used to control the temperature and humidity in the refrigerator, etc., and the cabinet is used to provide storage space. It can be understood that the refrigeration system, the cooling system, and the control system include specific components that can achieve the above functions.

[0052] In some embodiments, the refrigeration system includes a compressor, a condenser, an evaporator, and a throttling device. Among them, the compressor is used to compress the refrigerant gas, increase the pressure and temperature, and thus promote the flow of the refrigerant in the system. During the compression process, the refrigerant changes from a low-pressure and low-temperature gas to a high-pressure and high-temperature gas, thereby producing a refrigeration effect. The condenser is used to cool the high-temperature and high-pressure gas discharged from the compressor into a liquid state. The heat is released through the heat sink, and the refrigerant gas is converted into a liquid state, ready to enter the next step of the refrigeration cycle. The evaporator is used to absorb heat in the refrigeration system. The refrigerant evaporates from a liquid state to a gas state in the evaporator, absorbing heat from the surrounding environment, thereby achieving the purpose of lowering the temperature inside the refrigerator. The throttling device may include an expansion valve and a capillary tube, which are used to adjust the flow rate of the refrigerant, reduce its pressure, and make it become a low-temperature and low-pressure gas-liquid mixed state, ready to enter the evaporator.

[0053] In some embodiments, the cooling system includes a fan connected to the evaporator. The fan circulates air in the compartments, such as the freezer and refrigerator, to transfer heat to the evaporator, helping to maintain a low temperature environment inside the refrigerator.

[0054] It should be noted that the above example is merely a simple division of the functions of the refrigerator and does not constitute a limitation on the specific structure of the refrigerator in the embodiment of the present application.

[0055] Among them, the air-cooled refrigerator is a household appliance that uses air for refrigeration. Its working principle is to cool the air through the built-in evaporator, and then the fan blows the cold air to every corner inside the refrigerator, forming a continuously circulating cold air system.

[0056] However, during the defrosting stage of the evaporator, the temperature of the freezer rises. Therefore, in order to address the impact of defrosting of air-cooled refrigerators on freshness preservation, a fan shielding device can be added to the evaporator chamber. When the freezer compartment of the refrigerator is defrosted, the shielding device is turned on to shield the fan around, so as to minimize the heat generated by the evaporator defrosting and flow into the freezer. However, although the shielding device blocks the problem of defrosting hot air flowing to the top of the freezer to a certain extent, the temperature of the evaporator chamber is high after defrosting, and the refrigeration system needs to be started to cool the evaporator first before the refrigerator can be further cooled, which is not conducive to the energy saving of the refrigerator. Another way is to add a cold storage device to the upper part of the freezer where the temperature returns more, store a certain amount of cold during the refrigeration stage, and use the stored cold during the defrosting stage to alleviate the temperature return of the top of the freezer during the defrosting stage, which can also play a certain role in freezing constant temperature. However, more cold needs to be stored during the refrigeration stage, which will still increase the energy consumption of the whole machine and is not conducive to energy saving.

[0057] Therefore, in some embodiments, when the evaporator is defrosted, the fan is controlled to reverse, and the cold air in the refrigeration room is introduced into the evaporator room through the air supply port at the top of the freezer to blow the hot air generated by defrosting out of the evaporator room, thereby cooling the evaporator, avoiding the consumption of cold energy in the initial refrigeration stage after defrosting, and saving energy and reducing consumption. However, when the air supply port is opened and the fan is reversed, the hot air from the outside environment will pass through the freezer door seal and the air supply port of the freezer to enter the evaporator room in the opposite direction, and be drained from the freezer. During the air flow balance process, relatively high-humidity air will be introduced from the outside environment into the freezer, causing the temperature of the upper part of the freezer to rise. At the same time, the high-humidity air from the outside is more likely to condense and frost locally in the freezer, further exacerbating the temperature rise at the top of the freezer, and worsening the freezing constant temperature preservation effect.

[0058] To solve the problem of the freezer compartment temperature rising during the evaporator defrosting period, refer to Figure 1 , an embodiment of the present application provides a refrigerator, comprising:

[0059] Refrigerator 2 and freezer 1.

[0060] An evaporation chamber 12, in which an evaporator 7, a defrost temperature sensor, a defrost heater 8 and a refrigeration fan 5 are arranged;

[0061] The refrigerating chamber 2 and the freezing chamber 1 are both connected to the evaporation chamber 12 via the air duct assembly 3 .

[0062] The refrigerating chamber 2 is provided with a refrigerating air supply damper 41, and the freezing chamber 1 is provided with a freezing air supply damper 31 and a freezing air return damper 32;

[0063] The controller 11 is connected to the evaporator 7, the defrost temperature sensor, the defrost heater 8, the refrigeration fan 5, the refrigeration air supply damper 41, the freezing air supply damper 31, and the freezing return air damper 32 respectively.

[0064] Specifically, the evaporator 7, the defrost temperature sensor 6, and the defrost heater 8 are arranged in the evaporation chamber 12. The defrost temperature sensor 6 detects the temperature of the surface of the evaporator 7 in real time. When the temperature of the surface of the evaporator 7 drops to a certain temperature, the controller 11 generates a control instruction to start defrosting. The defrost heater 8 receives the signal from the controller 11 and starts working. The defrost heater 8 is arranged below the evaporator 7 so as to directly heat the evaporator 7. The heat generated by the defrost heater 8 after it is turned on will be conducted to the surface of the evaporator 7, so that the frost layer on the surface of the evaporator 7 will gradually melt.

[0065] During the defrosting process, the defrosting temperature sensor 6 monitors the surface temperature of the evaporator 7 in real time. Once it is detected that the temperature of the evaporator 7 reaches the preset defrosting end temperature, such as 5 degrees Celsius, the defrosting heater 8 stops working and the defrosting of the evaporator 7 ends.

[0066] However, during the defrosting process of the evaporator 7, the temperature of the gas in the evaporation chamber 12 will rise because the defrosting heater 8 is turned on. After the defrosting is completed, the temperature in the evaporation chamber 12 needs to be lowered to prevent the gas with a higher temperature from entering the freezing chamber 1 and raising the temperature in the freezing chamber 1. Therefore, in the present application, by adding a freezing air supply damper 31, a freezing return air damper 32 and a refrigerated air supply damper 41 to the air duct assembly 3, and utilizing the existing configuration of the single-cycle air-cooled refrigerator, after detecting that the defrosting reaches the opening condition, the freezing air supply damper 31, the freezing return air damper 32 and the refrigerated air supply damper 41 are controlled to be opened or closed, so as to reduce the problem of the temperature rising in the freezing chamber 1 during the defrosting period.

[0067] Specifically, the controller 11 is configured as follows:

[0068] In response to the defrost instruction for defrosting the evaporator 7, the refrigeration return air damper 32 and the refrigeration supply air damper 31 are controlled to be closed; and the refrigeration supply air damper 41 is controlled to be opened for a first preset time;

[0069] Close the refrigeration air supply damper 41 and turn on the defrost heater 8.

[0070] The evaporator temperature detected by the defrost temperature sensor 6 is obtained.

[0071] If the evaporator temperature is within the first preset temperature range, the defrost heater 8 is controlled to be turned off, the refrigeration air supply damper 41 is controlled to be opened, and the refrigeration fan 5 is controlled to be reversed for a second preset time.

[0072] When the single-cycle air-cooled refrigerator meets the defrosting conditions, the controller 11 will generate a defrosting instruction, and the refrigerator enters the defrosting mode. At this time, the frozen return air damper 32 and the frozen supply air damper 31 are first closed to isolate the external air from entering the freezing chamber 1, and the refrigerated supply air damper 41 is opened for the first preset time, wherein the first preset time is 1-3 minutes. For example, in the embodiment of the present application, the first preset time is 3 minutes. After the refrigerated supply air damper 41 is opened for 3 minutes, on the one hand, the gas with a higher temperature in the refrigerating chamber 2 can be introduced into the evaporation chamber 12 to increase the temperature in the evaporation chamber 12, and on the other hand, the air pressure in the evaporation chamber 12 can be balanced. After the refrigerated supply air damper 41 is opened for the first preset time, the refrigerated supply air damper 41 is first closed to prevent the defrosting heater 8 from affecting the temperature in the refrigerating chamber 2 after it is turned on.

[0073] When the refrigerated air supply damper 41 is closed, the defrost heater 8 can be turned on, and the surface of the evaporator 7 can be heated by the defrost heater 8 to melt the frost layer on the surface of the evaporator 7. In the process of the defrost heater 8 heating the evaporator 7, the defrost temperature sensor 6 detects the evaporator temperature in real time. When the evaporator temperature is within the first temperature range, the defrost heater 8 disconnection condition is reached. At this time, the controller 11 controls the refrigerated air supply damper 41 to open, and at the same time controls the refrigeration fan 5 to reverse. It can be understood that the forward rotation of the refrigeration fan 5 can send the gas in the evaporation chamber 12 into the cold storage chamber 2 or the freezing chamber 1 through the air duct assembly 3. When the refrigeration fan 5 reverses, the refrigeration fan 5 can quickly blow off the water droplets on the surface of the evaporator 7. At the same time, the refrigeration fan 5 reverses, and the refrigeration supply damper 41 is opened to introduce the relatively cold air in the cold storage chamber 2 into the evaporation chamber 12, and then the hot air flow in the evaporation chamber 12 is discharged outside the evaporation chamber 12, so that the evaporation chamber 12 is cooled down. The refrigerated air supply damper 41 is opened, which increases the flow path of external air into the box body, making the heat exchange between cold and hot air more complete, making the refrigeration cycle thermal cycle more efficient and more energy-saving.

[0074] In addition, air is drawn from the cold storage room 2, and air with a relatively high humidity is introduced from the external environment into the cold storage room 2 during the air flow balance process, further increasing the relative humidity of the cold storage room 2, which is beneficial to the preservation of refrigerated fruits and vegetables.

[0075] In some embodiments, the refrigerator provided by the present application further includes a defrost drain pipe 9 and a water receiving tray 10. The defrost drain pipe 9 is connected to the evaporation chamber 12. One end of the defrost drain pipe 9 is connected to the evaporator 7, and the other end of the defrost water receiving pipe is arranged in the water receiving tray 10. The defrost water formed by the defrosting of the evaporator 7 can be discharged into the water receiving tray 10 through the defrost drain pipe 9. In order to prevent the cold energy generated by the evaporator 7 from leaking through the defrost drain pipe 9 during the refrigeration process, a sealing cover 91 is arranged at one end of the defrost drain pipe 9 close to the water receiving tray 10; the sealing cover 91 is hinged to the defrost drain pipe 9; the sealing cover 91 is used to rotate in a direction away from the defrost drain pipe 9 when the internal air pressure of the defrost drain pipe 9 is greater than the external air pressure. It can be understood that when there is a certain amount of defrost water in the defrost drain pipe 9, the sealing cover 91 can be opened under the gravity of the defrost water.

[0076] During the operation of the evaporator 7, the surface temperature of the evaporator 7 decreases, and the air with high humidity will condense into frost after contacting the surface of the evaporator 7. When the frost on the surface of the evaporator 7 is thicker, it will affect the refrigeration efficiency of the evaporator 7. Therefore, it is necessary to accurately judge the defrost start conditions of the evaporator 7. In the application embodiment, the defrost conditions can be judged by the compressor running time and the evaporator 7 temperature.

[0077] Specifically, the controller 11 is further configured as follows:

[0078] Get the compressor running time.

[0079] If the compressor running time is greater than the preset running time, a defrost command is generated.

[0080] The evaporator temperature detected by the defrost temperature sensor 6 is obtained.

[0081] If the evaporator temperature is within the second preset temperature range, a defrost instruction is generated.

[0082] Specifically, the compressor operation time is the cumulative operation time of the compressor, that is, the timing starts after the compressor is started and stops after the compressor is turned off. The cumulative operation time of the compressor is calculated, and a preset operation time is set. For example, the preset operation time is 20 minutes. When the cumulative operation time of the compressor reaches the preset operation time, the controller 11 generates a defrost instruction to control the refrigerated air supply damper 31 and the refrigerated return air damper 32 to close. In addition, the temperature of the evaporator 7 can also be detected. When the temperature of the evaporator 7 reaches the second preset temperature range, the controller 11 generates a defrost instruction to control the refrigerated air supply damper 31 and the refrigerated return air damper 32 to close.

[0083] In some embodiments, the refrigerator provided in the present application further includes a temperature sensor; the temperature sensor is used to detect the temperature of the evaporation chamber 12 .

[0084] After controlling the refrigeration fan 5 to reverse for a second preset time, the controller 11 is further configured to:

[0085] Get the evaporation chamber temperature detected by the temperature sensor.

[0086] If the temperature of the evaporation chamber is lower than the preset evaporation temperature, the refrigeration fan 5 is controlled to rotate forward, the refrigeration air supply damper 31 is controlled to open, and the refrigeration air return damper 32 is controlled to open.

[0087] After the refrigeration fan 5 is reversed for the second preset time, the temperature of the evaporation chamber 12 can be detected by the temperature sensor, and then it can be determined whether the refrigeration can be started normally according to the temperature of the evaporation chamber. When the temperature of the evaporation chamber is lower than the preset evaporation temperature, it means that the temperature in the evaporation chamber 12 has been reduced to a suitable temperature, and the gas in the evaporation chamber 12 entering the freezing chamber 1 will not increase the temperature in the freezing chamber 1. Therefore, when the temperature of the evaporation chamber is lower than the preset evaporation temperature, the refrigeration fan 5 can be controlled to rotate forward, and the freezing air supply damper 31 and the freezing air return damper 32 can be controlled to open.

[0088] In some embodiments, the surface of the evaporator 7 is coated with a hydrophobic coating, and the air duct assembly 3 is provided with a heat preservation layer 33. By coating the surface of the evaporator 7 with a hydrophobic coating, the speed of blowing off the evaporator 7 and the defrosting water droplets on the surface of the evaporator 7 can be increased during the reversal of the refrigeration fan 5, thereby accelerating the defrosting process. At the same time, the air duct assembly 3 is provided with a heat preservation layer 33, which can reduce the temperature change of the freezing chamber 1 after the defrosting heater 8 is started.

[0089] In some embodiments, Figure 2 As shown, the present application also provides a refrigerator defrosting control method, which is applied to the refrigerator provided in the above embodiment, comprising:

[0090] S100: Responding to the defrosting instruction for defrosting the evaporator 7 to control the refrigeration return air damper 32 and the refrigeration supply air damper 31 to be closed; and controlling the refrigeration supply air damper 41 to be opened for a first preset time.

[0091] S200: Close the refrigeration air supply damper 41 and turn on the defrost heater 8.

[0092] S300: Acquire the evaporator temperature detected by the defrost temperature sensor 6.

[0093] S400: If the evaporator temperature is within the first preset temperature range, the defrost heater 8 is controlled to be turned off, the refrigeration air supply damper 41 is controlled to be opened, and the refrigeration fan 5 is controlled to be reversed for a second preset time.

[0094] In some embodiments, the refrigerator defrost control method further includes:

[0095] Get the compressor running time.

[0096] The evaporator temperature detected by the defrost temperature sensor 6 is obtained.

[0097] If the compressor operation time is greater than the preset operation time or the evaporator temperature is within the second preset temperature range, a defrost instruction is generated.

[0098] In some embodiments, after controlling the refrigeration fan 5 to reverse for a second preset time, the refrigerator defrosting control method further includes:

[0099] Get the evaporation chamber temperature detected by the temperature sensor.

[0100] If the temperature of the evaporation chamber is lower than the preset evaporation temperature, the refrigeration fan 5 is controlled to rotate forward, the refrigeration air supply damper 31 is controlled to open, and the refrigeration air return damper 32 is controlled to open.

[0101] It can be seen from the above technical scheme that the present application provides a refrigerator and a defrost control method thereof, wherein the refrigerator comprises a refrigerating chamber 2; a freezing chamber 1; an evaporating chamber 12, wherein the evaporating chamber 12 is provided with an evaporator 7, a defrosting temperature sensor 6, a defrosting heater 8 and a refrigerating fan 5; the refrigerating chamber 2 and the freezing chamber 1 are both connected to the evaporating chamber 12 through an air duct assembly 3; the refrigerating chamber 2 is provided with a refrigerating air supply damper 41, and the freezing chamber 1 is provided with a freezing air supply damper 31 and a freezing return air damper 32; a controller 11, wherein the controller 11 is respectively connected to the evaporator 7, the defrosting temperature sensor 6, the defrosting heater 8, the refrigerating fan 5, The refrigerated supply air damper 41, the frozen supply air damper 31, and the frozen return air damper 32 are connected; the controller 11 is configured to: respond to the defrost instruction for defrosting the evaporator 7 to control the frozen return air damper 32 and the frozen supply air damper 31 to close; control the refrigerated supply air damper 41 to open for a first preset time; close the refrigerated supply air damper 41, and turn on the defrost heater 8; obtain the evaporator temperature detected by the defrost temperature sensor 6; if the evaporator temperature is within the first preset temperature range, control the defrost heater 8 to close, control the refrigerated supply air damper 41 to open, and control the refrigeration fan 5 to reverse for a second preset time. The evaporator chamber 12 closes the refrigerated air supply damper 31, the refrigerated return air damper 32 and the refrigerated air supply damper 41 during the defrosting stage, which can isolate the hot air generated by defrosting heating from the freezer chamber 1 and the refrigerator chamber 2 to the greatest extent, reducing the temperature rise of the freezer chamber 1 during the defrosting period; after the defrosting is completed, the fan is reversed, and the refrigerated air supply damper 41 is opened to introduce the airflow from the refrigerator chamber 2 into the evaporator chamber 12, thereby discharging the defrosting hot air in the evaporator chamber 12 to the external environment, so as to solve the problem of temperature rise in the freezer chamber 1 during the defrosting of the evaporator 7.

[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, characterized in that: include: Cold room; Freezer; An evaporation chamber, wherein an evaporator, a defrost temperature sensor, a defrost heater and a refrigeration fan are arranged in the evaporation chamber; The refrigerating chamber and the freezing chamber are both connected to the evaporating chamber through an air duct assembly; The refrigerating chamber is provided with a refrigerating air supply damper, and the freezing chamber is provided with a freezing air supply damper and a freezing air return damper; A controller, wherein the controller is respectively connected to the evaporator, the defrost temperature sensor, the defrost heater, the refrigeration fan, the refrigeration air supply damper, the freezing air supply damper, and the freezing return air damper; The controller is configured as: In response to a defrost instruction for defrosting the evaporator, the refrigerated return air damper and the refrigerated supply air damper are controlled to be closed; and the refrigerated supply air damper is controlled to be opened for a first preset time; Close the refrigeration air supply damper and turn on the defrost heater; Acquiring the evaporator temperature detected by the defrost temperature sensor; If the evaporator temperature is within a first preset temperature range, the defrost heater is controlled to be turned off, the refrigeration air supply damper is controlled to be opened, and the refrigeration fan is controlled to be reversed for a second preset time.

2. The refrigerator according to claim 1, characterized in that: It also includes a defrost drain pipe and a water receiving tray. The defrost drain pipe is communicated with the evaporation chamber, one end of the defrost drain pipe is connected to the evaporator, and the other end of the defrost water receiving pipe is arranged in the water receiving tray.

3. The refrigerator according to claim 2, characterized in that: A sealing cover is provided at one end of the defrost drain pipe close to the water receiving tray; the sealing cover is hinged to the defrost drain pipe; The sealing cover is used for rotating in a direction away from the defrost drain pipe when the internal air pressure of the defrost drain pipe is greater than the external air pressure.

4. The refrigerator according to claim 1, characterized in that: Also included is a compressor, the compressor is connected to the controller, and the controller is further configured to: Get the compressor running time; If the compressor operation time is greater than the preset operation time, the defrost instruction is generated.

5. The refrigerator according to claim 1, characterized in that: The controller is also configured to: Acquiring the evaporator temperature detected by the defrost temperature sensor; If the evaporator temperature is within a second preset temperature range, the defrost instruction is generated.

6. The refrigerator according to claim 1, characterized in that: Also includes a temperature sensor; the temperature sensor is used to detect the temperature of the evaporation chamber; After controlling the refrigeration fan to reverse for a second preset time, the controller is further configured to: Acquiring the evaporation chamber temperature detected by the temperature sensor; If the temperature of the evaporation chamber is lower than the preset evaporation temperature, the refrigeration fan is controlled to rotate forward, the refrigeration air supply damper is controlled to open, and the refrigeration return air damper is controlled to open.

7. The refrigerator according to claim 1, characterized in that: The surface of the evaporator is coated with a hydrophobic coating, and the air duct component is provided with a thermal insulation layer.

8. A refrigerator defrosting control method, applied to the refrigerator according to any one of claims 1 to 7, characterized in that: include: In response to a defrost instruction for defrosting the evaporator, the refrigeration return air damper and the refrigeration supply air damper are controlled to be closed; and the refrigeration supply air damper is controlled to be opened for a first preset time; Close the refrigerated air supply damper and turn on the defrost heater; Get the evaporator temperature detected by the defrost temperature sensor; If the evaporator temperature is within a first preset temperature range, the defrost heater is controlled to be turned off, the refrigeration air supply damper is controlled to be opened, and the refrigeration fan is controlled to be reversed for a second preset time.

9. The refrigerator defrosting control method according to claim 8, characterized in that: The method further comprises: Get the compressor running time; Acquiring the evaporator temperature detected by the defrost temperature sensor; If the compressor operation time is greater than the preset operation time or the evaporator temperature is within a second preset temperature range, the defrost instruction is generated.

10. The refrigerator defrosting control method according to claim 8, characterized in that: After controlling the refrigeration fan to reverse for a second preset time, the method further includes: Obtaining the evaporation chamber temperature detected by the temperature sensor; If the temperature of the evaporation chamber is lower than the preset evaporation temperature, the refrigeration fan is controlled to rotate forward, the refrigeration air supply damper is controlled to open, and the refrigeration return air damper is controlled to open.

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