Refrigerator and defrosting control method thereof

Abstract

The invention discloses a refrigerator and a defrosting control method thereof, when the refrigerator meets a preset defrosting condition, a defrosting heater is controlled to operate to enable the refrigerator to enter a defrosting mode, and a fan is controlled to work; and when the real-time evaporator temperature reaches a preset defrosting ending threshold value, the draught fan and the defrosting heater are controlled to stop working so that the refrigerator can exit the defrosting mode. According to the embodiment of the invention, when the refrigerator is in the defrosting mode, the fan is controlled to work, the heat generated by the defrosting heater is blown to the air duct, so that the refrigerator is uniformly defrosted, and when the temperature of the evaporator reaches the defrosting finishing temperature, the refrigerator is controlled to quit defrosting, so that the influence on food stored in the compartment is reduced, effective defrosting of the air duct is realized, and the service life of the refrigerator is prolonged. And the defrosting effect of the refrigerator is improved.

Description

Technical Field

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

[0002] At present, the automatic defrosting method for air-cooled refrigerators in the industry is to hang a tubular heater under the evaporator and achieve the purpose of defrosting by heat radiation from the heater. The defrosting by heat radiation may be uneven. If the defrosting time is too long, it may cause a great impact on the temperature of the compartment and affect the freezing effect of food. If the heating time is too short, the air duct cannot be effectively defrosted and the defrosting effect is poor. Summary of the invention

[0003] The purpose of the embodiment of the present invention is to provide a refrigerator and a defrost control method thereof, which can control the operation of the fan when the refrigerator is in the defrost mode to blow the heat generated by the defrost heater to the air duct, so that the refrigerator defrosts evenly, and control the refrigerator to exit defrosting when the evaporator temperature reaches the defrost end temperature, thereby reducing the impact on the food stored in the room, realizing the effective defrosting of the air duct, and improving the defrosting effect of the refrigerator.

[0004] To achieve the above object, an embodiment of the present invention provides a refrigerator, comprising:

[0005] The evaporator is located in the refrigerator and is used to generate cold air;

[0006] Air duct, located inside the refrigerator, is used to direct the cold air to the refrigerator compartment;

[0007] The defrost heater is arranged near the evaporator and is used to generate heat for defrosting the air duct and the evaporator;

[0008] The fan is located near the evaporator and is used to blow the heat into the air duct;

[0009] A defrost sensor is provided on the evaporator and is used to monitor the real-time evaporator temperature of the evaporator;

[0010] Controller for:

[0011] When the refrigerator meets the preset defrosting conditions, the defrosting heater is controlled to operate so that the refrigerator enters the defrosting mode;

[0012] Control fan operation;

[0013] When the real-time evaporator temperature reaches the preset defrost end threshold, the fan and the defrost heater are controlled to stop working so that the refrigerator exits the defrost mode.

[0014] As an improvement of the above solution, the control of the fan operation includes:

[0015] When the refrigerator is in the defrost mode, if the real-time evaporator temperature monitored by the defrost sensor is less than a preset wind speed adjustment threshold, the fan is controlled to run at a first operating speed; wherein the wind speed adjustment threshold is less than the defrost end threshold;

[0016] When the refrigerator is in the defrost mode, if the real-time evaporator temperature is greater than or equal to the wind speed adjustment threshold, and the real-time evaporator temperature is less than the defrost end threshold, the fan is controlled to operate at a second operating speed; wherein the first operating speed is greater than the second operating speed.

[0017] As an improvement of the above solution, the refrigerator further includes an air duct sensor, which is arranged in the air duct, and the air duct sensor is used to monitor the real-time air duct temperature of the air duct;

[0018] The controller is further used for:

[0019] When the refrigerator is in the defrost mode, if the real-time air duct temperature monitored by the air duct sensor is less than or equal to a preset device safety threshold, the defrost heater is controlled to continue heating;

[0020] When the refrigerator is in the defrost mode, if the real-time air duct temperature is greater than the device safety threshold, the defrost heater is controlled to stop heating.

[0021] As an improvement of the above solution, the defrost heater is a defrost heating wire, and the defrost heater is arranged on the blades of the fan.

[0022] As an improvement of the above solution, the control of the fan operation includes:

[0023] When the refrigerator is in the defrost mode, if the continuous working time of the defrost heater reaches a preset preheating time, the fan is controlled to work.

[0024] As an improvement of the above solution, the controller is further used for:

[0025] When the refrigerator meets the defrosting condition, the air supply port of the compartment of the refrigerator is controlled to be closed, and the air return port of the compartment of the refrigerator is controlled to be closed.

[0026] To achieve the above object, an embodiment of the present invention further provides a refrigerator defrosting control method, comprising:

[0027] When the refrigerator meets the preset defrosting condition, controlling the defrost heater of the refrigerator to operate so that the refrigerator enters the defrosting mode;

[0028] Controlling the operation of the fan of the refrigerator; wherein the fan is arranged near the evaporator;

[0029] When the real-time evaporator temperature monitored by the defrost sensor reaches a preset defrost end threshold, the fan and the defrost heater are controlled to stop working so that the refrigerator exits the defrost mode; wherein the defrost sensor is arranged on the evaporator.

[0030] As an improvement of the above solution, the controlling of the fan operation of the refrigerator includes:

[0031] When the refrigerator is in the defrost mode, if the real-time evaporator temperature monitored by the defrost sensor is less than the wind speed adjustment threshold, the fan is controlled to run at a first operating speed; wherein the wind speed adjustment threshold is less than the defrost end threshold;

[0032] When the refrigerator is in the defrost mode, if the real-time evaporator temperature is greater than or equal to the wind speed adjustment threshold, and the real-time evaporator temperature is less than the defrost end threshold, the fan is controlled to operate at a second operating speed; wherein the first operating speed is greater than the second operating speed.

[0033] As an improvement of the above scheme, it also includes:

[0034] When the refrigerator is in the defrost mode, if the real-time air duct temperature monitored by the air duct sensor is less than or equal to a preset device safety threshold, the defrost heater is controlled to continue heating; wherein the air duct sensor is arranged in the air duct;

[0035] When the refrigerator is in the defrost mode, if the real-time air duct temperature is greater than the device safety threshold, the defrost heater is controlled to stop heating.

[0036] As an improvement of the above solution, the defrost heater is a defrost heating wire, and the defrost heater is arranged on the blades of the fan.

[0037] Compared with the prior art, the refrigerator and the defrost control method thereof described in the embodiment of the present invention are provided with a defrost sensor on the evaporator to monitor the real-time evaporator temperature, and then determine whether to control the refrigerator to enter the defrost mode. When the refrigerator is in the defrost mode, the fan is controlled to work to blow the heat generated by the defrost heater to the air duct, so that the refrigerator defrosts evenly. When the evaporator temperature reaches the defrost end temperature, the refrigerator is controlled to exit defrosting, which reduces the impact on the food stored in the room, realizes the effective defrosting of the air duct, and improves the defrosting effect of the refrigerator. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a three-dimensional diagram of a refrigerator provided by an embodiment of the present invention;

[0039] Figure 2 is a three-dimensional diagram of a refrigerator door provided by an embodiment of the present invention;

[0040] Figure 3 is a schematic structural diagram of a refrigeration system provided by an embodiment of the present invention;

[0041] Figure 4 is a schematic diagram of the flow direction of the refrigerant during refrigeration provided by an embodiment of the present invention;

[0042] Figure 5 is a schematic diagram of an air duct provided by an embodiment of the present invention;

[0043] Figure 6 is a schematic diagram of the back of the air duct provided by an embodiment of the present invention;

[0044] Figure 7 is an internal schematic diagram of an air duct provided by an embodiment of the present invention;

[0045] Figure 8 is a first working flow diagram of a controller provided by an embodiment of the present invention;

[0046] Fig. 9 is a second working flow diagram of the controller provided by an embodiment of the present invention;

[0047] Fig.10 is a third working flow diagram of the controller provided in an embodiment of the present invention;

[0048] Fig.11 is a fourth working flow diagram of the controller provided by an embodiment of the present invention;

[0049] Fig.12 The present invention is a flowchart of a refrigerator defrosting control method provided by an embodiment of the present invention.

[0050] Among them, 100, box body, 200, door body, 210, door body shell, 220, door body liner, 230, upper end cover, 240, lower end cover; 1, compressor, 2, condenser, 3, anti-condensation tube, 4, drying filter, 5, pressure reducer, 6, evaporator, 7, gas-liquid separator, 30, air supply outlet damper, 31, return air outlet damper, 32, air supply outlet, 33, return air outlet, 34, fan, 35, defrost sensor, 36, air duct sensor, 37, air duct. DETAILED DESCRIPTION

[0051] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0052] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0053] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0054] See also Figure 1 , Figure 1 is a perspective view of a refrigerator provided by an embodiment of the present invention. The refrigerator of this embodiment is approximately in the shape of a rectangular parallelepiped. The refrigerator includes a box body 100 defining a storage space and a plurality of door bodies 200 disposed at the opening of the box body 100. Figure 2 As shown, the door body 200 includes a door body outer shell 210 located on the outside of the box body 100, a door body liner 220 located on the inside of the box body 100, an upper end cover 230, a lower end cover 240, and an insulation layer located between the door body outer shell 210, the door body liner 220, the upper end cover 230, and the lower end cover 240; usually, the insulation layer is filled with foam. The box body 100 is provided with a chamber, wherein the chamber includes a component storage chamber for placing components in the refrigerator, such as a compressor, etc., and also includes a storage space for storing food, medicine, etc. Among them, the refrigerator in the embodiment of the present invention includes a refrigeration system, see Figure 3 The refrigeration system structure diagram shown in the figure, the refrigeration system is arranged in the component storage cavity, and is used to provide power for the refrigeration cycle of the refrigerator, including a compressor, an evaporator, a pressure reducer and a condenser; the storage space can be divided into multiple storage rooms (compartments), and the storage rooms can be configured as refrigerators, freezers, and temperature-changing rooms (also called fresh-keeping rooms) according to different uses. Each storage room corresponds to one or more door bodies, for example, Figure 1 The storage room at the upper part is provided with a double-opening door body. The door body can be pivotally arranged at the opening of the box body, and can also be opened in a drawer-like manner to realize drawer-like storage.

[0055] See also Figure 3 , Figure 31 is a schematic diagram of the structure of a refrigeration system in a refrigerator provided in an embodiment of the present invention, wherein the refrigeration system comprises a compressor 1, a condenser 2, an anti-condensation tube 3, a drying filter 4, a pressure reducer 5, an evaporator 6 and a gas-liquid separator 7. The working process of the refrigeration system comprises a compression process, a condensation process, a throttling process and an evaporation process.

[0056] Among them, combined Figure 3 The compression process is as follows: plug in the refrigerator power cord, and when the contacts of the thermostat are connected, compressor 1 starts working, and the low-temperature, low-pressure refrigerant is sucked into compressor 1, compressed into high-temperature, high-pressure superheated gas in the cylinder of compressor 1, and then discharged into condenser 2; the condensation process is as follows: the high-temperature, high-pressure refrigerant gas dissipates heat through condenser 2, the temperature continues to drop, and is gradually cooled to a saturated vapor at room temperature and high pressure, and further cooled to a saturated liquid, and the temperature no longer drops. The temperature at this time is called the condensation temperature, and the pressure of the refrigerant remains almost unchanged during the entire condensation process; the throttling process is as follows: the system after condensation The saturated liquid refrigerant is filtered through the drying filter 4 to remove moisture and impurities and then flows into the pressure reducer 5 (such as a capillary tube), through which the refrigerant is throttled and depressurized, and becomes wet steam at room temperature and low pressure; the evaporation process is as follows: the wet steam at room temperature and low pressure begins to absorb heat and vaporizes in the evaporator 6, which not only reduces the temperature of the evaporator and its surroundings, but also turns the refrigerant into a low-temperature, low-pressure gas. The refrigerant coming out of the evaporator 6 passes through the gas-liquid separator 7 and then returns to the compressor 1 again, repeating the above process to transfer the heat in the refrigerator to the air outside the box, thus achieving the purpose of refrigeration. The flow direction of the refrigerant can also be seen in Figure 4 shown.

[0057] See also Figure 5 , is an example diagram of an air duct provided by an embodiment of the present invention, including a supply air outlet damper 30, a return air outlet damper 31, a supply air outlet 32 ​​and a return air outlet 33. The supply air outlet damper is controlled to control the opening and closing state of the supply air outlet, and the return air outlet damper is controlled to control the opening and closing state of the return air outlet, thereby realizing the connection and isolation between the compartment and the air duct. Figure 6 , is a schematic diagram of the back of the air duct, including a fan 34 (in a preferred embodiment, also including a defrost heating wire integrated on the fan blade) and a defrost sensor 35. Figure 7 , is an internal schematic diagram of the air duct, including an air duct sensor 36 and an air duct 37.

[0058] Exemplarily, the air supply outlet damper or the return air outlet damper is composed of a damper position switch (reed switch) and a magnet to achieve closing and opening of the air supply outlet or the return air outlet.

[0059] Specifically, the refrigerator also includes a controller (not shown in the figure). In an embodiment of the present invention, the controller is used to: when the refrigerator meets the preset defrost conditions, control the defrost heater to operate so that the refrigerator enters the defrost mode; control the fan to work; when the real-time evaporator temperature reaches the preset defrost end threshold, control the fan and the defrost heater to stop working so that the refrigerator exits the defrost mode.

[0060] For example, see Figure 8 , Figure 8 is a first working flow chart of a controller provided in an embodiment of the present invention, wherein the controller is used to execute steps S11 to S12:

[0061] S11. When the refrigerator meets the preset defrosting conditions, the defrost heater is controlled to operate so that the refrigerator enters the defrosting mode; and the fan is controlled to operate.

[0062] S12: When the real-time evaporator temperature reaches a preset defrost end threshold, the fan and the defrost heater are controlled to stop working so that the refrigerator exits the defrost mode.

[0063] Specifically, in step S11, the defrost condition may be that the time from the last defrost is greater than a preset defrost time interval (for example, 1.5 hours may be taken); or, the defrost condition may be that the temperature of the compartment is greater than a preset temperature threshold for a preset time period; or, the defrost condition may be that the monitored real-time evaporator temperature is greater than a preset upper temperature limit, which is not limited here. The defrost condition may refer to the prior art and will not be described in detail here. In addition, the preset defrost time interval, preset temperature threshold and preset upper temperature limit are all set by the manufacturer according to actual conditions and are not specifically limited here.

[0064] For example, in step S12, the defrost end threshold may be 5° C. It is worth noting that the specific value of the defrost end threshold is not limited to the above 5 degrees Celsius, and the specific value is set by the manufacturer according to actual conditions and is not limited here.

[0065] The embodiment of the present invention controls the operation of the fan when the refrigerator is in the defrost mode, blows the heat generated by the defrost heater to the air duct, so that the refrigerator defrosts evenly, and controls the refrigerator to exit defrosting when the evaporator temperature reaches the defrost end temperature, thereby reducing the impact on the food stored in the room, achieving effective defrosting of the air duct, and improving the defrosting effect of the refrigerator.

[0066] In a preferred embodiment, the controlling the fan operation includes:

[0067] When the refrigerator is in the defrost mode, if the real-time evaporator temperature monitored by the defrost sensor is less than a preset wind speed adjustment threshold, the fan is controlled to run at a first operating speed; wherein the wind speed adjustment threshold is less than the defrost end threshold;

[0068] When the refrigerator is in the defrost mode, if the real-time evaporator temperature is greater than or equal to the wind speed adjustment threshold, and the real-time evaporator temperature is less than the defrost end threshold, the fan is controlled to operate at a second operating speed; wherein the first operating speed is greater than the second operating speed.

[0069] For example, see Fig. 9 , Fig. 9 : is a second working flow chart of the controller provided in an embodiment of the present invention, wherein the controller controls the fan to work through the following steps:

[0070] S13, obtain the operating mode of the refrigerator, and then enter step S14.

[0071] S14, determining whether the operation mode is the defrost mode, if so, proceeding to step S15, if not, returning to step S13.

[0072] S15, determining whether the real-time evaporator temperature monitored by the defrost sensor is less than a preset wind speed adjustment threshold, if so, proceeding to step S16, if not, proceeding to step S17.

[0073] S16, controlling the fan to run at a first operating speed; wherein the wind speed adjustment threshold is less than the defrost end threshold.

[0074] S17. When the real-time evaporator temperature is less than the defrost end threshold, control the fan to operate at a second operating speed; wherein the first operating speed is greater than the second operating speed.

[0075] For example, when the defrost end threshold is 5° C., the wind speed adjustment threshold may be 3° C. It is worth noting that the defrost end threshold and the wind speed adjustment threshold are not limited to the above specific values, and can be set by the manufacturer according to actual conditions, and are not limited here.

[0076] It is understandable that when the defrost mode is first entered, there is more frost in the air duct. At this time, controlling the fan to run at a higher speed (first operating speed) can allow the heat generated by the defrost heater to enter the air duct faster, thereby speeding up the defrost process. After the defrost heater has been working for a period of time, the temperature in the air duct begins to rise and the amount of frost gradually decreases. Therefore, when the real-time evaporator temperature is monitored to be greater than or equal to the wind speed adjustment threshold, controlling the fan to run at a lower speed (second operating speed) can reduce the noise and energy consumption generated during the operation of the fan.

[0077] In a preferred embodiment, the refrigerator further comprises an air duct sensor disposed in the air duct, the air duct sensor being used to monitor the real-time air duct temperature of the air duct;

[0078] The controller is further used for:

[0079] When the refrigerator is in the defrost mode, if the real-time air duct temperature monitored by the air duct sensor is less than or equal to a preset device safety threshold, the defrost heater is controlled to continue heating;

[0080] When the refrigerator is in the defrost mode, if the real-time air duct temperature is greater than the device safety threshold, the defrost heater is controlled to stop heating.

[0081] For example, see Fig.10 , Fig.10 is a third working flow chart of the controller provided in an embodiment of the present invention, wherein the controller is further configured to execute steps S18 to S22:

[0082] S18, obtain the operating mode of the refrigerator, and then enter step S19.

[0083] S19, determining whether the operation mode is the defrost mode, if so, proceeding to step S20, if not, returning to step S18.

[0084] S20, determining whether the real-time air duct temperature monitored by the air duct sensor is less than or equal to a preset device safety threshold, if so, proceeding to step S21, if not, proceeding to step S22.

[0085] S21, controlling the defrost heater to continue heating.

[0086] S22, controlling the defrost heater to stop heating.

[0087] It is understandable that as the defrost heater enters the working state, the temperature in the air duct will rise. When the temperature in the air duct is too high, it will affect the air duct and even cause safety hazards. Therefore, in a preferred embodiment of the present invention, an air duct sensor is also provided to monitor the real-time air duct temperature. When the real-time air duct temperature is greater than the device safety threshold, the defrost heater is controlled to stop heating to prevent the temperature in the air duct from continuing to rise. At this time, the heat generated previously is used for defrosting. When it is monitored that the real-time air duct temperature is less than or equal to the device safety threshold, the defrost heater is controlled to continue heating.

[0088] It is worth noting that the device safety threshold is set according to the characteristics of the air duct itself. When the temperature of the air duct exceeds the device safety threshold, there is a risk of damage to the air duct. The specific value of the device safety threshold is set by the manufacturer based on actual conditions and is not limited here.

[0089] Furthermore, in order to prevent the defrost heater from repeatedly jumping between the heating and stopping heating states, the device safety threshold is set to include a first device safety threshold and a second device safety threshold, the first device safety threshold is greater than the second device safety threshold, and when the refrigerator is in the defrost mode, when the real-time air duct temperature is less than the first device safety threshold, the defrost heater is controlled to continue heating, and when the real-time air duct temperature is greater than or equal to the first device safety threshold, the defrost heater is controlled to stop heating until the real-time air duct temperature is less than the second device safety threshold, and the defrost heater is controlled to start heating.

[0090] In a preferred embodiment, the defrost heater is a defrost heating wire, and the defrost heater is arranged on the blades of the fan.

[0091] Compared with the prior art of suspending a tubular heater under the evaporator, in a preferred embodiment of the present invention, a defrost heating wire is used as a defrost heater, and the defrost heater (defrost heating wire) is integrated on the fan blades, which can save installation space, reduce material consumption, improve production efficiency, and facilitate after-sales maintenance.

[0092] In a preferred embodiment, the controlling the fan operation includes:

[0093] When the refrigerator is in the defrost mode, if the continuous working time of the defrost heater reaches a preset preheating time, the fan is controlled to work.

[0094] In a preferred embodiment, the controller is further used for:

[0095] When the refrigerator meets the defrosting condition, the air supply port of the compartment of the refrigerator is controlled to be closed, and the air return port of the compartment of the refrigerator is controlled to be closed.

[0096] It is understandable that when the refrigerator is in the defrosting condition, the air supply outlet door is controlled to be closed and the return air outlet door is controlled to be opened, so that the air supply outlet and the return air outlet are separated from the compartment (the air supply outlet / air outlet are closed), thereby forming an "evaporator→fan→air duct→evaporator" air circulation path. In a preferred embodiment of the present invention, when the refrigerator is in the defrosting condition, the defrosting heater is controlled to operate to put the refrigerator into the defrosting mode only when it is detected that the air supply outlet door is completely closed and the return air outlet door is completely opened.

[0097] In order to make the working process of the refrigerator controller clearer, see Fig.11 , Fig.11 This is a fourth working flow diagram of the controller provided in an embodiment of the present invention, which is described below with a specific example:

[0098] The main control board (controller) continuously reads the working status of the refrigerator to determine whether the refrigerator has reached the defrost condition; when the refrigerator has reached the defrost condition, the air supply outlet damper is closed, the return air outlet damper is opened, and it is determined whether the two dampers are in place (whether the air supply outlet damper is closed in place, and whether the return air outlet damper is opened in place); when the two dampers are in place, the defrost heating wire is controlled to work and preheat for a period of time; thereafter, the fan is controlled to run at a high speed (the first operating speed), and the defrost heating wire continues to work, and the readings of the defrost sensor and the air duct sensor are read at the same time to determine whether the reading of the defrost sensor reaches the wind speed adjustment threshold: b) If the wind speed adjustment threshold is not reached, it is determined whether the reading of the air duct temperature sensor reaches the device safety threshold. If so, the defrost heating wire is controlled to stop working, and the wind The machine continues to run at a low speed, and continues to determine whether the reading of the defrost sensor reaches the wind speed adjustment threshold, until the reading of the defrost sensor reaches the wind speed adjustment threshold; a), if the reading of the defrost sensor reaches the wind speed adjustment threshold, the fan is controlled to run at a low speed (the second operating speed), the defrost heating wire continues to work, and the readings of the defrost sensor and the air duct sensor are read at the same time to determine whether the reading of the defrost sensor reaches the defrost end threshold. If so, the fan is controlled to stop, the defrost heating wire stops working, and the defrost process ends. Otherwise, determine whether the reading of the air duct temperature sensor reaches the device safety threshold. If so, the defrost heating wire is controlled to stop working, the fan continues to run at a low speed, and then continues to determine whether the reading of the defrost sensor reaches the defrost end threshold. Repeat the above steps until the defrost process ends.

[0099] Compared with the prior art, the refrigerator described in the embodiment of the present invention is provided with a defrost sensor on the evaporator to monitor the real-time evaporator temperature, and then determine whether to control the refrigerator to enter the defrost mode. When the refrigerator is in the defrost mode, the fan is controlled to work to blow the heat generated by the defrost heater to the air duct, so that the refrigerator defrosts evenly. When the evaporator temperature reaches the defrost end temperature, the refrigerator is controlled to exit defrosting, which reduces the impact on the food stored in the room, realizes the effective defrosting of the air duct, and improves the defrosting effect of the refrigerator.

[0100] See also Fig.12 , is a flow chart of a refrigerator defrosting control method provided by an embodiment of the present invention, comprising steps S1 to S2:

[0101] S1. When the refrigerator meets the preset defrosting conditions, control the defrost heater of the refrigerator to operate so that the refrigerator enters the defrosting mode; control the fan of the refrigerator to operate; wherein the fan is arranged near the evaporator;

[0102] S2. When the real-time evaporator temperature monitored by the defrost sensor reaches a preset defrost end threshold, the fan and the defrost heater are controlled to stop working so that the refrigerator exits the defrost mode; wherein the defrost sensor is arranged on the evaporator.

[0103] In a preferred embodiment, the controlling the operation of the fan of the refrigerator includes:

[0104] When the refrigerator is in the defrost mode, if the real-time evaporator temperature monitored by the defrost sensor is less than the wind speed adjustment threshold, the fan is controlled to run at a first operating speed; wherein the wind speed adjustment threshold is less than the defrost end threshold;

[0105] When the refrigerator is in the defrost mode, if the real-time evaporator temperature is greater than or equal to the wind speed adjustment threshold, and the real-time evaporator temperature is less than the defrost end threshold, the fan is controlled to operate at a second operating speed; wherein the first operating speed is greater than the second operating speed.

[0106] In a preferred embodiment, it also includes:

[0107] When the refrigerator is in the defrost mode, if the real-time air duct temperature monitored by the air duct sensor is less than or equal to a preset device safety threshold, the defrost heater is controlled to continue heating; wherein the air duct sensor is arranged in the air duct;

[0108] When the refrigerator is in the defrost mode, if the real-time air duct temperature is greater than the device safety threshold, the defrost heater is controlled to stop heating.

[0109] In a preferred embodiment, the defrost heater is a defrost heating wire, and the defrost heater is arranged on the blades of the fan.

[0110] It is worth noting that the working process of any refrigerator defrost control method of the embodiments of the present invention can refer to the specific working process of the refrigerator controller described in the above embodiments, which will not be repeated here.

[0111] Compared with the prior art, the refrigerator defrost control method described in the embodiment of the present invention controls the operation of the fan when the refrigerator is in the defrost mode, blows the heat generated by the defrost heater to the air duct, so that the refrigerator defrosts evenly, and controls the refrigerator to exit defrosting when the evaporator temperature reaches the defrost end temperature, thereby reducing the impact on the food stored in the room, achieving effective defrosting of the air duct, and improving the defrosting effect of the refrigerator.

[0112] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A refrigerator, characterized in that: include: The evaporator is located in the refrigerator and is used to generate cold air; Air duct, located inside the refrigerator, is used to direct the cold air to the refrigerator compartment; The defrost heater is arranged near the evaporator and is used to generate heat for defrosting the air duct and the evaporator; The fan is located near the evaporator and is used to blow the heat into the air duct; A defrost sensor is provided on the evaporator and is used to monitor the real-time evaporator temperature of the evaporator; Controller for: When the refrigerator meets the preset defrosting conditions, the defrosting heater is controlled to operate so that the refrigerator enters the defrosting mode; Control fan operation; When the real-time evaporator temperature reaches the preset defrost end threshold, the fan and the defrost heater are controlled to stop working so that the refrigerator exits the defrost mode.

2. The refrigerator according to claim 1, characterized in that: The control of the fan operation includes: When the refrigerator is in the defrost mode, if the real-time evaporator temperature monitored by the defrost sensor is less than a preset wind speed adjustment threshold, the fan is controlled to run at a first operating speed; wherein the wind speed adjustment threshold is less than the defrost end threshold; When the refrigerator is in the defrost mode, if the real-time evaporator temperature is greater than or equal to the wind speed adjustment threshold, and the real-time evaporator temperature is less than the defrost end threshold, the fan is controlled to operate at a second operating speed; wherein the first operating speed is greater than the second operating speed.

3. The refrigerator according to claim 1 or 2, characterized in that: Also included is an air duct sensor, which is disposed in the air duct, and the air duct sensor is used to monitor the real-time air duct temperature of the air duct; The controller is further used for: When the refrigerator is in the defrost mode, if the real-time air duct temperature monitored by the air duct sensor is less than or equal to a preset device safety threshold, the defrost heater is controlled to continue heating; When the refrigerator is in the defrost mode, if the real-time air duct temperature is greater than the device safety threshold, the defrost heater is controlled to stop heating.

4. The refrigerator according to claim 3, characterized in that: The defrost heater is a defrost heating wire, and the defrost heater is arranged on the fan blades of the fan.

5. The refrigerator according to claim 3, characterized in that: The control of the fan operation includes: When the refrigerator is in the defrost mode, if the continuous working time of the defrost heater reaches a preset preheating time, the fan is controlled to work.

6. The refrigerator according to claim 3, characterized in that: The controller is further configured to: When the refrigerator meets the defrosting condition, the air supply port of the compartment of the refrigerator is controlled to be closed, and the air return port of the compartment of the refrigerator is controlled to be closed.

7. A refrigerator defrosting control method, characterized in that: include: When the refrigerator meets the preset defrosting condition, controlling the defrost heater of the refrigerator to operate so that the refrigerator enters the defrosting mode; Controlling the operation of the fan of the refrigerator; wherein the fan is arranged near the evaporator; When the real-time evaporator temperature monitored by the defrost sensor reaches a preset defrost end threshold, the fan and the defrost heater are controlled to stop working so that the refrigerator exits the defrost mode; wherein the defrost sensor is arranged on the evaporator.

8. The refrigerator defrosting control method according to claim 7, characterized in that: The controlling the operation of the fan of the refrigerator comprises: When the refrigerator is in the defrost mode, if the real-time evaporator temperature monitored by the defrost sensor is less than the wind speed adjustment threshold, the fan is controlled to run at a first operating speed; wherein the wind speed adjustment threshold is less than the defrost end threshold; When the refrigerator is in the defrost mode, if the real-time evaporator temperature is greater than or equal to the wind speed adjustment threshold, and the real-time evaporator temperature is less than the defrost end threshold, the fan is controlled to operate at a second operating speed; wherein the first operating speed is greater than the second operating speed.

9. The refrigerator defrosting control method according to claim 7 or 8, characterized in that: Also includes: When the refrigerator is in the defrost mode, if the real-time air duct temperature monitored by the air duct sensor is less than or equal to a preset device safety threshold, the defrost heater is controlled to continue heating; wherein the air duct sensor is arranged in the air duct; When the refrigerator is in the defrost mode, if the real-time air duct temperature is greater than the device safety threshold, the defrost heater is controlled to stop heating.

10. The refrigerator defrosting control method according to claim 9, characterized in that: The defrost heater is a defrost heating wire, and the defrost heater is arranged on the fan blades of the fan.

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