Refrigerators and their defrosting control methods

Abstract

This invention provides a refrigerator and its defrosting control method. The refrigerator includes a refrigerator compartment, a freezer compartment, an evaporator compartment, and a controller. The controller is configured to: respond to a defrosting command for evaporator defrosting by controlling the evaporator return air damper and the freezer supply air damper to close; control the refrigerator supply air damper to open for a first preset time; close the refrigerator supply air damper and turn on the defrosting heater; acquire the evaporator temperature detected by a defrosting temperature sensor; if the evaporator temperature is within a first preset temperature range, control the defrosting heater to close, control the refrigerator supply air damper to open, and control the refrigeration fan to reverse for a second preset time. After defrosting, the fan reverses, opening the refrigerator supply air damper to introduce airflow from the refrigerator compartment into the evaporator compartment, thereby discharging the defrosting hot air from the evaporator compartment to the external environment, thus solving the problem of temperature rise in the freezer compartment during evaporator defrosting.

Description

Technical Field

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

[0002] A frost-free refrigerator is a household appliance that uses air for cooling. It works by using a built-in evaporator to cool the air, which is then blown by a fan to every corner of the refrigerator's interior, creating a continuously circulating cold air system.

[0003] However, during the defrosting stage of the evaporator, the temperature in the freezer compartment rises. Therefore, to address the impact of defrosting on preservation in frost-free refrigerators, one approach is to add a fan shielding device inside the evaporator compartment. When the freezer compartment defrosts, the shielding device opens, covering the fan and minimizing the flow of defrosting heat into the freezer compartment. However, while the shielding device prevents defrosting heat from flowing to the top of the freezer compartment to some extent, the evaporator compartment temperature remains high after defrosting. The refrigeration system needs to be activated to cool the evaporator before further cooling the refrigerator, which is detrimental to the overall energy efficiency of the refrigerator. Another method involves adding a cold storage device to the upper part of the freezer compartment where the temperature rises significantly. This stores a certain amount of cold air during the cooling phase and uses this stored cold air to alleviate the temperature rise at the top of the freezer during defrosting, which can also help maintain a constant freezer temperature. However, this requires storing even more cold air during the cooling phase, still increasing overall energy consumption and hindering energy efficiency.

[0004] Therefore, in some refrigerators, by reversing the fan at the end of defrosting, cold air from the cooling compartment is introduced into the evaporator chamber through the air vents at the top of the freezer compartment to blow the hot air generated during defrosting out of the evaporator, thereby cooling the evaporator and avoiding energy consumption during the initial cooling phase after defrosting, thus saving energy. However, when the air vents are open and the fan reverses, hot air from the outside environment will enter the evaporator chamber through the freezer door seal and the air vents in the freezer compartment in the opposite direction. During the airflow balancing process, relatively humid air from the outside environment will be introduced into the freezer compartment, causing the temperature in the upper part of the freezer compartment to rise. At the same time, the humid outside air is more likely to condense and frost in some parts of the freezer compartment, further aggravating the temperature rise at the top of the freezer and deteriorating the constant temperature preservation effect. Summary of the Invention

[0005] This application provides a refrigerator and a defrosting control method thereof to solve the problem of temperature rise in the freezer compartment during evaporator defrosting.

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

[0007] Refrigeration compartment;

[0008] Freezer compartment;

[0009] An evaporation chamber is provided with an evaporator, a defrost temperature sensor, a defrost heater, and a refrigeration fan.

[0010] Both the refrigerator compartment and the freezer compartment are connected to the evaporation chamber via an air duct assembly;

[0011] The refrigerator compartment is equipped with a refrigerator air supply damper, and the freezer compartment is equipped with a freezer air supply damper and a freezer return air damper.

[0012] The controller is connected to the evaporator, the defrost temperature sensor, the defrost heater, the refrigeration fan, the refrigeration air supply damper, the refrigeration air supply damper, and the refrigeration return air damper, respectively.

[0013] The controller is configured as follows:

[0014] In response to a defrost command for evaporator defrosting, control the refrigeration return air damper and the refrigeration supply air damper to close; control the refrigeration supply air damper to open for a first preset time;

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

[0016] Obtain the evaporator temperature detected by the defrosting temperature sensor;

[0017] If the evaporator temperature is within the first preset temperature range, then control the defrosting heater to turn off, control the refrigeration air supply damper to open, and control the refrigeration fan to reverse for a second preset time.

[0018] Optionally, it also includes a defrost drain pipe and a water collection tray. 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 collection pipe is disposed in the water collection tray.

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

[0020] The sealing cap is used to rotate away from the defrost drain pipe when the internal air pressure is greater than the external air pressure.

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

[0022] Obtain the compressor running time;

[0023] If the compressor running time is longer than the preset running time, then the defrosting command is generated.

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

[0025] Obtain the evaporator temperature detected by the defrosting temperature sensor;

[0026] If the evaporator temperature is within the second preset temperature range, then the defrosting command is generated.

[0027] Optionally, a temperature sensor may also be 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] Obtain the evaporation chamber temperature detected by the temperature sensor;

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

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

[0032] Secondly, this application provides a refrigerator defrosting control method, applied to the refrigerator described in the first aspect, comprising:

[0033] Responding to defrost commands for evaporator defrosting, control the refrigeration return air damper and the refrigeration supply air damper to close; control the refrigeration supply air damper to open for a first preset time;

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

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

[0036] If the evaporator temperature is within the first preset temperature range, then control the defrosting heater to turn off, control the refrigeration air supply damper to open, and control the refrigeration fan to reverse for a second preset time.

[0037] Optionally, the method further includes:

[0038] Obtain the compressor running time;

[0039] Obtain the evaporator temperature detected by the defrosting temperature sensor;

[0040] If the compressor running time is longer than the preset running time or the evaporator temperature is within the second preset temperature range, then the defrost command is generated.

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

[0042] Obtain the temperature of the evaporation chamber detected by the temperature sensor;

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

[0044] As can be seen from the above technical solutions, this application provides a refrigerator and its defrosting control method. The refrigerator includes a refrigerator compartment; a freezer compartment; and an evaporator compartment. The evaporator compartment is equipped with an evaporator, a defrost temperature sensor, a defrost heater, and a cooling fan. The refrigerator compartment and the freezer compartment are both connected to the evaporator compartment through an air duct assembly. The refrigerator compartment is equipped with a refrigerator air supply damper, and the freezer compartment is equipped with a freezer air supply damper and a freezer return air damper. A controller is connected to the evaporator, the defrost temperature sensor, the defrost heater, the cooling fan, and the refrigerator air supply damper. The system includes a damper, a refrigeration air supply damper, and a refrigeration return air damper. The controller is configured to: respond to a defrost command for evaporator defrosting; control the refrigeration return air damper and the refrigeration air supply damper; control the refrigeration air supply damper to open for a first preset time; close the refrigeration air supply damper and turn on the defrost heater; acquire the evaporator temperature detected by the defrost temperature sensor; if the evaporator temperature is within a first preset temperature range, control the defrost heater to close, control the refrigeration air supply damper to open, and control the refrigeration fan to reverse for a second preset time. During the defrost phase, the evaporator chamber closes the refrigeration air supply damper, the refrigeration return air damper, and the refrigeration air supply damper, maximizing the isolation of the hot air generated by defrosting heating from the freezer and refrigerator chambers, reducing the temperature rise in the freezer chamber during defrosting; after defrosting, the fan reverses, opening the refrigeration air supply damper to introduce airflow from the refrigerator chamber into the evaporator chamber, thereby discharging the defrosting hot air from the evaporator chamber to the external environment, thus solving the problem of temperature rise in the freezer chamber during evaporator defrosting. Attached Figure Description

[0045] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a schematic diagram of the refrigerator structure provided in an embodiment of this application;

[0047] Figure 2 A flowchart of a refrigerator defrosting control method provided in an embodiment of this application.

[0048] Figure label:

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

[0050] The embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described below do not represent all embodiments consistent with this application. They are merely examples of systems and methods consistent with some aspects of this application as detailed in the claims.

[0051] The refrigerator provided in this application embodiment is a refrigeration device, which, in order to achieve refrigeration and operation, includes at least a refrigeration system, a cooling system, a control system, and a cabinet. The refrigeration system is used to generate 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 inside the refrigerator, and the cabinet is used to provide storage space. It is understood that the refrigeration system, cooling system, and control system include specific components capable of achieving the above functions.

[0052] In some embodiments, the refrigeration system includes a compressor, a condenser, an evaporator, and a throttling device. The compressor compresses the refrigerant gas, increasing its pressure and temperature, thereby propelling the refrigerant through the system. During compression, the refrigerant changes from a low-pressure, low-temperature gas to a high-pressure, high-temperature gas, thus producing a cooling effect. The condenser cools the high-temperature, high-pressure gas discharged from the compressor into a liquid state. Heat is released through heat sinks, and the refrigerant gas transforms into a liquid state, ready to enter the next step of the refrigeration cycle. The evaporator absorbs heat in the refrigeration system. The refrigerant evaporates from a liquid state to a gaseous state in the evaporator, absorbing heat from the surrounding environment, thereby lowering the internal temperature of the refrigerator. The throttling device may include an expansion valve and a capillary tube, used to regulate the refrigerant flow rate, reduce its pressure, and convert it into a low-temperature, low-pressure gas-liquid mixture, ready to enter the evaporator.

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

[0054] It should be noted that the above examples are merely a simple division of refrigerator functions and do not limit the specific structural configuration of the refrigerator in the embodiments of this application.

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

[0056] However, during the defrosting stage of the evaporator, the temperature in the freezer compartment rises. Therefore, to address the impact of defrosting on freshness in frost-free refrigerators, one approach is to add a fan shielding device inside the evaporator compartment. When the freezer compartment defrosts, the shielding device opens, covering the fan and minimizing the heat generated during defrosting from flowing into the freezer compartment. While this shielding device prevents defrosting heat from flowing to the top of the freezer compartment to some extent, the evaporator compartment temperature remains high after defrosting. The refrigeration system needs to be activated to cool the evaporator before further cooling the refrigerator, which is detrimental to overall energy efficiency. Another method involves adding a cold storage device to the upper part of the freezer compartment where the temperature rises significantly. This stores a certain amount of cold air during the cooling phase and uses it to alleviate the temperature rise at the top of the freezer during defrosting, contributing to temperature stability. However, this requires storing even more cold air during the cooling phase, still increasing overall energy consumption and hindering energy efficiency.

[0057] Therefore, in some embodiments, after the evaporator defrosts, the fan is reversed to introduce cold air from the refrigeration compartment into the evaporator chamber through the air outlet at the top of the freezer compartment, thereby blowing the hot air generated during defrosting out of the evaporator chamber and cooling the evaporator, thus avoiding energy consumption during the initial cooling phase after defrosting and saving energy. However, when the air outlet is opened and the fan reverses, hot air from the outside environment will enter the evaporator chamber through the freezer door seal and the air outlet of the freezer compartment in the opposite direction. During the airflow balancing process, relatively high humidity air from the outside environment will be introduced into the freezer chamber, causing the temperature at the top of the freezer chamber to rise. At the same time, the high humidity air from the outside is more likely to condense and frost in some parts of the freezer chamber, further aggravating the temperature rise at the top of the freezer and deteriorating the constant temperature preservation effect.

[0058] To address the issue of temperature rise in the freezer compartment during evaporator defrosting, see [link / reference]. Figure 1 This application provides a refrigerator, including:

[0059] Refrigerator compartment 2 and freezer compartment 1.

[0060] Evaporation chamber 12, which is equipped with evaporator 7, defrost temperature sensor, defrost heater 8 and refrigeration fan 5;

[0061] Both the refrigerator compartment 2 and the freezer compartment 1 are connected to the evaporator compartment 12 through the air duct assembly 3.

[0062] The refrigerator compartment 2 is equipped with a refrigerator air supply damper 41, and the freezer compartment 1 is equipped with a freezer air supply damper 31 and a freezer return air 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 refrigeration air supply damper 31, and the refrigeration return air damper 32.

[0064] Specifically, the evaporation chamber 12 is equipped with an evaporator 7, a defrost temperature sensor 6, and a defrost heater 8. The defrost temperature sensor 6 monitors the surface temperature of the evaporator 7 in real time. When the surface temperature of the evaporator 7 drops to a certain level, the controller 11 generates a control command to initiate defrosting. The defrost heater 8 receives the signal from the controller 11 and begins operation. The defrost heater 8 is positioned below the evaporator 7 to directly heat it. The heat generated by the defrost heater 8 after it is turned on is conducted to the surface of the evaporator 7, causing the frost layer on the surface of the evaporator 7 to gradually melt.

[0065] During the defrosting process, the defrosting temperature sensor 6 monitors the surface temperature of the evaporator 7 in real time. Once the temperature of the evaporator 7 reaches the preset defrosting end temperature, such as 5 degrees Celsius, the defrosting heater 8 will stop working, and the defrosting of the evaporator 7 will be completed.

[0066] However, during the defrosting process of evaporator 7, the temperature of the gas in evaporator chamber 12 rises after defrosting heater 8 is turned on. After defrosting is completed, the temperature in evaporator chamber 12 needs to be lowered to prevent high-temperature gas from entering freezer chamber 1 and causing the temperature in freezer chamber 1 to rise. Therefore, in this application, by adding a freezer air supply damper 31, a freezer return air damper 32, and a refrigerator air supply damper 41 to the air duct assembly 3, and utilizing the existing configuration of a single-cycle air-cooled refrigerator, the problem of temperature rise in freezer chamber 1 during defrosting is reduced by controlling the opening or closing of the freezer air supply damper 31, the freezer return air damper 32, and the refrigerator air supply damper 41 after the defrosting conditions are detected.

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

[0068] In response to a defrost command for defrosting the evaporator 7, control the refrigeration return air damper 32 and the refrigeration supply air damper 31 to close; control the refrigeration supply air damper 41 to open for a first preset time;

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

[0070] Obtain the evaporator temperature detected by defrost temperature sensor 6.

[0071] If the evaporator temperature is within the first preset temperature range, then control the defrosting heater 8 to turn off, control the refrigeration air supply damper 41 to open, and control the refrigeration fan 5 to reverse for the second preset time.

[0072] When the single-cycle air-cooled refrigerator meets the defrosting conditions, the controller 11 generates a defrosting command, and the refrigerator enters defrosting mode. At this time, the freezer return air damper 32 and the freezer supply air damper 31 are first closed to prevent external air from entering the freezer compartment 1. The refrigerator supply air damper 41 is then opened for a first preset time, which is 1-3 minutes. For example, in this embodiment, the first preset time is 3 minutes. After the refrigerator supply air damper 41 is opened for 3 minutes, on the one hand, the higher temperature air in the refrigerator compartment 2 can be introduced into the evaporator compartment 12 to increase the temperature in the evaporator compartment 12. On the other hand, it can also balance the air pressure in the evaporator compartment 12. After the refrigerator supply air damper 41 has been opened for the first preset time, it is first closed to prevent the defrost heater 8 from affecting the temperature in the refrigerator compartment 2.

[0073] When the refrigeration air supply damper 41 is closed, the defrosting heater 8 can be turned on. The defrosting heater 8 heats the surface of the evaporator 7, melting the frost layer on the surface of the evaporator 7. During the process of the defrosting heater 8 heating the evaporator 7, the defrosting temperature sensor 6 monitors the evaporator temperature in real time. When the evaporator temperature is within the first temperature range, the defrosting heater 8 is deactivated. At this time, the controller 11 controls the refrigeration air supply damper 41 to open and simultaneously controls the refrigeration fan 5 to reverse. It can be understood that when the refrigeration fan 5 rotates forward, it can send the gas in the evaporation chamber 12 into the refrigeration chamber 2 or the freezer chamber 1 through the air duct assembly 3. When the refrigeration fan 5 rotates in reverse, it can quickly blow off the water droplets on the surface of the evaporator 7. At the same time, when the refrigeration fan 5 rotates in reverse, the refrigeration air supply damper 41 opens, introducing the relatively cool air in the refrigeration chamber 2 into the evaporation chamber 12, thereby expelling the hot air in the evaporation chamber 12 and cooling the evaporation chamber 12. With the refrigerated air supply damper 41 open, the flow path of outside air into the cabinet is increased, allowing for more thorough heat exchange between hot and cold air, resulting in higher efficiency of the refrigeration cycle and greater energy savings.

[0074] In addition, by drawing air from the cold storage compartment 2, air with relatively high humidity will be introduced into the cold storage compartment 2 from the outside environment during the airflow balancing process, which will further increase the relative humidity of the cold storage compartment 2 and is beneficial to the preservation of refrigerated fruits and vegetables.

[0075] In some embodiments, the refrigerator provided in this application further includes a defrost drain pipe 9 and a drip tray 10. The defrost drain pipe 9 is connected to the evaporator chamber 12, one end of the defrost drain pipe 9 is connected to the evaporator 7, and the other end of the defrost drain pipe is disposed in the drip tray 10. The defrost water generated by defrosting the evaporator 7 can be drained into the drip tray 10 through the defrost drain pipe 9. To prevent leakage of the cold energy generated by the evaporator 7 through the defrost drain pipe 9 during the cooling process, a sealing cap 91 is provided at the end of the defrost drain pipe 9 near the drip tray 10. The sealing cap 91 is hinged to the defrost drain pipe 9. The sealing cap 91 is used to rotate 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 is understood that when there is a certain amount of defrost water in the defrost drain pipe 9, the sealing cap 91 can be opened under the gravity of the defrost water.

[0076] During the operation of evaporator 7, the surface temperature of evaporator 7 decreases. When the air with high humidity comes into contact with the surface of evaporator 7, it will condense into frost. When the frost on the surface of evaporator 7 is thick, it will affect the cooling efficiency of evaporator 7. Therefore, it is necessary to accurately determine the defrosting start conditions of evaporator 7. In the application embodiment, the defrosting conditions can be determined by the compressor running time and the temperature of evaporator 7.

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

[0078] Obtain the compressor running time.

[0079] If the compressor runs for longer than the preset running time, a defrosting command will be generated.

[0080] Obtain the evaporator temperature detected by defrost temperature sensor 6.

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

[0082] Specifically, the compressor running time is the cumulative running time of the compressor, that is, the timer starts after the compressor starts and stops after the compressor is turned off. A preset running time is set, for example, 20 minutes. When the cumulative running time of the compressor reaches the preset running time, the controller 11 generates a defrost command, controlling the refrigeration air supply damper 31 and the refrigeration air return damper 32 to close. In addition, the temperature of the evaporator 7 can also be detected. When the temperature of the evaporator 7 reaches a second preset temperature range, the controller 11 generates a defrost command, controlling the refrigeration air supply damper 31 and the refrigeration air return damper 32 to close.

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

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

[0085] Obtain the temperature of the evaporation chamber detected by the temperature sensor.

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

[0087] After the refrigeration fan 5 reverses for a second preset time, the temperature of the evaporation chamber 12 can be detected by a temperature sensor, and the refrigeration can be started normally based on the evaporation chamber temperature. When the evaporation chamber temperature is lower than the preset evaporation temperature, it means that the temperature inside the evaporation chamber 12 has dropped to a suitable temperature. The gas in the evaporation chamber 12 entering the freezer chamber 1 will not raise the temperature inside the freezer chamber 1. Therefore, when the evaporation chamber temperature is lower than the preset evaporation temperature, the refrigeration fan 5 can be controlled to rotate forward, and the refrigeration air supply damper 31 and the refrigeration air return damper 32 can be opened.

[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 thermal insulation layer 33. By coating the surface of the evaporator 7 with a hydrophobic coating, the defrosting water droplets on the evaporator 7 and its surface can be blown off faster during the reversal of the refrigeration fan 5, thus accelerating the defrosting process. At the same time, the thermal insulation layer 33 provided in the air duct assembly 3 can reduce the temperature change of the freezer compartment 1 after the defrosting heater 8 is activated.

[0089] In some embodiments, such as Figure 2 As shown, this application also provides a refrigerator defrosting control method, applied to the refrigerator provided in the above embodiments, including:

[0090] S100: In response to a defrost command for defrosting the evaporator 7, control the refrigeration return air damper 32 and the refrigeration supply air damper 31 to close; control the refrigeration supply air damper 41 to open for a first preset time.

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

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

[0093] S400: If the evaporator temperature is within the first preset temperature range, then control the defrost heater 8 to turn off, control the refrigeration air damper 41 to open, and control the refrigeration fan 5 to reverse for the second preset time.

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

[0095] Obtain the compressor running time.

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

[0097] If the compressor running time exceeds the preset running time or the evaporator temperature is within the second preset temperature range, a defrost command will be 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] Obtain the temperature of the evaporation chamber detected by the temperature sensor.

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

[0101] As can be seen from the above technical solutions, this application provides a refrigerator and its defrosting control method. The refrigerator includes a refrigerator compartment 2; a freezer compartment 1; and an evaporator compartment 12. The evaporator compartment 12 is equipped with an evaporator 7, a defrost temperature sensor 6, a defrost heater 8, and a cooling fan 5. Both the refrigerator compartment 2 and the freezer compartment 1 are connected to the evaporator compartment 12 through an air duct assembly 3. The refrigerator compartment 2 is equipped with a refrigerator air supply damper 41, and the freezer compartment 1 is equipped with a freezer air supply damper 31 and a freezer return air damper 32. A controller 11 is connected to the evaporator 7, the defrost temperature sensor 6, the defrost heater 8, and the cooling fan 5. The refrigerated air supply damper 41, the frozen air supply damper 31, and the frozen return air damper 32 are connected; the controller 11 is configured to: respond to a defrost command for defrosting the evaporator 7 to control the frozen return air damper 32 and the frozen air supply damper 31 to close; control the refrigerated air supply damper 41 to open for a first preset time; close the refrigerated air supply damper 41 and turn on the defrost heater 8; acquire 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 air supply damper 41 to open, and control the refrigeration fan 5 to reverse for a second preset time. During the defrosting stage, the evaporator 12 closes the freezer air supply damper 31, the freezer return air damper 32, and the refrigerator air supply damper 41, which can isolate the hot air generated by defrosting heating from the freezer 1 and the refrigerator 2 to the greatest extent and reduce the temperature rise of the freezer 1 during defrosting. After defrosting, the fan reverses and opens the refrigerator air supply damper 41 to introduce the airflow of the refrigerator 2 into the evaporator 12, thereby exhausting the defrosting hot air in the evaporator 12 to the outside environment, so as to solve the problem of temperature rise in the freezer 1 during the defrosting of the evaporator 7.

[0102] Similar parts between the embodiments provided in this application can be referred to mutually. The specific implementation methods provided above are only a few examples under the overall concept of this application and do not constitute a limitation on the scope of protection of this application. For those skilled in the art, any other implementation methods extended from the solution of this application without creative effort shall fall within the scope of protection of this application.

Claims

1. A refrigerator, characterized in that, include: Refrigerator; Freezer compartment; An evaporation chamber is provided with an evaporator, a defrost temperature sensor, a defrost heater, and a refrigeration fan. Both the refrigerator compartment and the freezer compartment are connected to the evaporation chamber via an air duct assembly; The refrigerator compartment is equipped with a refrigerator air supply damper, and the freezer compartment is equipped with a freezer air supply damper and a freezer return air damper. The controller is connected to the evaporator, the defrost temperature sensor, the defrost heater, the refrigeration fan, the refrigeration air supply damper, the refrigeration air supply damper, and the refrigeration return air damper, respectively. The controller is configured as follows: In response to a defrost command for evaporator defrosting, control the refrigeration return air damper and the refrigeration supply air damper to close; control the refrigeration supply air damper to open for a first preset time; Close the refrigeration air supply damper and turn on the defrosting heater; Obtain the evaporator temperature detected by the defrosting temperature sensor; If the evaporator temperature is within the first preset temperature range, then control the defrosting heater to turn off, control the refrigeration air supply damper to open, and control the refrigeration fan to reverse 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 collection tray. 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 drain pipe is located in the water collection tray.

3. The refrigerator according to claim 2, characterized in that, A sealing cap is provided at one end of the defrost drain pipe near the water receiving tray; the sealing cap is hinged to the defrost drain pipe. The sealing cap is used to rotate away from the defrost drain pipe when the internal air pressure is greater than the external air pressure.

4. The refrigerator according to claim 1, characterized in that, It also includes a compressor connected to the controller, the controller being further configured to: Obtain the compressor running time; If the compressor running time is longer than the preset running time, then the defrosting command is generated.

5. The refrigerator according to claim 1, characterized in that, The controller is also configured to: Obtain the evaporator temperature detected by the defrosting temperature sensor; If the evaporator temperature is within the second preset temperature range, then the defrosting command is generated.

6. The refrigerator according to claim 1, characterized in that, It 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: Obtain the evaporation chamber temperature detected by the temperature sensor; If the temperature of the evaporation chamber is lower than the preset evaporation temperature, then control the refrigeration fan to rotate in the forward direction, control the refrigeration air supply damper to open, and control the refrigeration return air damper 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 assembly is provided with a heat insulation layer.

8. A defrosting control method for a refrigerator, applied to the refrigerator according to any one of claims 1-7, characterized in that, include: Responding to defrost commands for evaporator defrosting, control the refrigeration return air damper and the refrigeration supply air damper to close; control the refrigeration supply air damper to open for a first preset time; Close the refrigeration air supply damper 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, then control the defrosting heater to turn off, control the refrigeration air supply damper to open, and control the refrigeration fan to reverse for a second preset time.

9. The refrigerator defrosting control method according to claim 8, characterized in that, The method further includes: Obtain the compressor running time; Obtain the evaporator temperature detected by the defrosting temperature sensor; If the compressor running time is longer than the preset running time or the evaporator temperature is within the second preset temperature range, then the defrosting command 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: Obtain the temperature of the evaporation chamber detected by the temperature sensor; If the temperature of the evaporation chamber is lower than the preset evaporation temperature, then control the refrigeration fan to rotate in the forward direction, control the refrigeration air supply damper to open, and control the refrigeration return air damper to open.

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