CN117588889A - Refrigerator and control method - Google Patents

Abstract

The application provides a refrigerator and a control method, wherein the refrigerator comprises a freezing chamber and a refrigerating chamber, and an evaporator, a first air duct and a defrosting heater are arranged on one side of the freezing chamber. The first air duct and the defrosting heater are respectively arranged at the top end and the bottom end of the evaporator, and a refrigerating fan is arranged in the first air duct. The top of the freezing chamber is provided with a second air duct which is respectively communicated with the first air duct and the freezing chamber. The top and the bottom of the refrigerating chamber are respectively provided with an air inlet and an air return opening, and the air inlet is provided with a refrigerating air door so as to form air circulation with the freezing chamber. The temperature sensor, the refrigerating fan, the refrigerating air door and the defrosting heater on the evaporator are respectively connected with the controller, the controller is used for controlling the opening and closing of the refrigerating fan, the refrigerating air door and the defrosting heater at different time points in a defrosting mode and a refrigerating mode respectively, hot air generated during defrosting and heating can be reduced to enter the freezing chamber, the temperature impact on the freezing chamber is reduced, and the problem that the temperature of the refrigerator chamber is increased in the defrosting process can be solved.

Description

Refrigerator and control method

Technical Field

The application relates to the technical field of refrigerator defrosting, in particular to a refrigerator and a control method.

Background

In the refrigerating process of the air-cooled refrigerator, moisture in the air in the refrigerator is separated out on the surface of an evaporator and is frozen into frost or ice, the heat resistance of the evaporator is increased along with the increase of the frost or ice, the heat exchange efficiency is reduced, meanwhile, the channel of the air flowing through the surface of the evaporator is reduced, the refrigerating circulation air quantity of the refrigerator is reduced, the refrigerating capacity of the refrigerator is gradually deteriorated, and even the refrigerator is not refrigerated, so that the air-cooled refrigerator needs to periodically remove the frost and ice accumulated on the surface of the evaporator, and the normal refrigerating function of the refrigerator is maintained.

The air-cooled refrigerator mainly adopts an electric heating mode to defrost the evaporator, for example, a defrosting heater can be adopted to heat and defrost the evaporator in a combined heat transfer mode of heat radiation, heat conduction and natural convection. However, experiments show that only 15% -20% of the heat emitted by the defrosting heater is effectively utilized, the rest heat is taken away by the structural components and the refrigerant and enters the refrigerating chamber through the air duct, so that the temperature of the refrigerating chamber rises too high in the defrosting process, the temperature impact on the stored food materials is large, and the fresh-keeping storage of the food materials is affected. And the hot air in the refrigerator downtime room is concentrated at the top and gathered, so that the temperature fluctuation of a local area of the room is also caused to be large, and the fresh-keeping storage of food materials is affected.

Disclosure of Invention

The application provides a refrigerator and a control method, which are used for solving the problem that the temperature of a refrigerator compartment is increased in the defrosting process.

In a first aspect, the present application provides a refrigerator comprising: a freezing chamber and a refrigerating chamber;

an evaporator, a first air duct and a defrosting heater are arranged on one side of the freezing chamber; the first air duct is arranged at the top end of the evaporator, and the defrosting heater is arranged at the bottom end of the evaporator; a refrigerating fan is arranged in the first air duct;

the top surface of the freezing chamber is provided with a second air channel, one end of the second air channel is communicated with the first air channel, and the other end of the second air channel is communicated with the freezing chamber;

the top of the refrigerating chamber is provided with an air inlet, and the bottom of the refrigerating chamber is provided with an air return opening; the freezing chamber is communicated with the refrigerating chamber through the air inlet and the air return opening; a refrigerating air door is arranged at the air inlet;

the evaporator is provided with a temperature sensor, and the temperature sensor, the refrigerating fan, the refrigerating air door and the defrosting heater are respectively connected with a controller;

the controller is configured to:

acquiring a working mode of the refrigerator, wherein the working mode comprises a defrosting mode and a refrigerating mode;

when the working mode is a defrosting mode, sending an opening instruction to the refrigeration air door so as to control the refrigeration air door to be opened for a first preset time;

sending a closing instruction to the refrigeration fan and the refrigeration air door respectively so as to control the refrigeration fan and the refrigeration air door to be closed;

sending an opening instruction to the defrosting heater so as to control the defrosting heater to be opened for a second preset time;

sending a closing instruction to the defrosting heater to control the defrosting heater to be closed, and simultaneously sending an opening instruction to the refrigeration air door to control the refrigeration air door to be opened;

when the working mode is a refrigeration mode, sending an opening instruction to a compressor of the refrigerator so as to control the opening of the compressor;

acquiring the temperature of the evaporator acquired by the temperature sensor, and sending an opening instruction to the refrigeration fan when the temperature is smaller than a temperature threshold value so as to control the refrigeration fan to be opened; and simultaneously sending a closing instruction to the refrigeration air door so as to control the refrigeration air door to be closed.

Optionally, a first air outlet is formed in the top of the first air channel, and the first air channel is communicated with the second air channel through the first air outlet.

Optionally, a second cold accumulation plate is arranged in the first air duct, and the second cold accumulation plate is arranged between the refrigeration fan and the first air outlet. Through setting up the second cold-storage board, can cool down the hot air that defrosting process formed to reduce the heat gets into the probability in the freezer.

Optionally, a second air outlet is arranged at one end of the second air channel away from the first air channel, and the second air channel is communicated with the freezing chamber through the second air outlet.

Optionally, the top surface and the bottom surface of the second air channel are both provided with first cold accumulation plates, and a cavity between the two first cold accumulation plates forms the second air channel. Through setting up first cold-storage board, can carry out the hot air cooling with unnecessary hot air to reduce hot air gets into the freezer. Meanwhile, when the refrigerator is stopped, the hot air converged at the top is cooled, so that the temperature return speed of the freezing chamber is slowed down.

Optionally, an insulation board is arranged on the bottom surface of the first cold accumulation board on the bottom surface, and the insulation board is made of sponge. By arranging the heat-insulating plate, the probability of the first cold accumulation plate at the bottom of the freezing chamber to form frost can be reduced in a state of returning to the temperature or opening the door.

Optionally, the refrigerator further comprises a freezing door body arranged on the outer side of the freezing chamber, a third cold accumulation plate is arranged on the inner side face of the freezing door body, and the third cold accumulation plate is arranged at the top of the freezing door body. By arranging the third cold accumulation plate, the heat load generated by heat leakage of the door seal and the door body foaming layer can be absorbed, and the temperature fluctuation of the freezing chamber is reduced.

Optionally, the controller is further configured to:

acquiring a working mode of the refrigerator, wherein the working mode further comprises a shutdown mode;

and when the working mode is the shutdown mode, sending an opening instruction to the refrigeration air door so as to control the refrigeration air door to be opened.

In a second aspect, the present application provides a control method for a refrigerator, which is applied to the refrigerator in the first aspect, and the method includes:

acquiring a working mode of the refrigerator, wherein the working mode comprises a defrosting mode and a refrigerating mode;

when the working mode is a defrosting mode, sending an opening instruction to a refrigeration air door so as to control the refrigeration air door to be opened for a first preset time;

sending a closing instruction to a refrigeration fan and the refrigeration air door respectively so as to control the refrigeration fan and the refrigeration air door to be closed;

sending an opening instruction to a defrosting heater to control the defrosting heater to be opened for a second preset time;

sending a closing instruction to the defrosting heater to control the defrosting heater to be closed, and simultaneously sending an opening instruction to the refrigeration air door to control the refrigeration air door to be opened;

when the working mode is a refrigeration mode, sending an opening instruction to a compressor of the refrigerator so as to control the opening of the compressor;

acquiring the temperature of an evaporator acquired by a temperature sensor, and sending an opening instruction to the refrigeration fan when the temperature is smaller than a temperature threshold value so as to control the refrigeration fan to be opened; and simultaneously sending a closing instruction to the refrigeration air door so as to control the refrigeration air door to be closed.

Optionally, the method further comprises:

acquiring a working mode of the refrigerator, wherein the working mode further comprises a shutdown mode;

and when the working mode is the shutdown mode, sending an opening instruction to the refrigeration air door so as to control the refrigeration air door to be opened.

According to the technical scheme, the application provides a refrigerator and a control method, wherein the refrigerator comprises: the refrigerating room comprises a freezing room and a refrigerating room, wherein an evaporator, a first air duct and a defrosting heater are arranged on one side of the freezing room. The first wind channel sets up the top at the evaporimeter, and defrosting heater sets up the bottom at the evaporimeter, is provided with cooling fan in the first wind channel. The top of freezer is provided with the second wind channel, and the one end and the first wind channel intercommunication of second wind channel, the other end and freezer intercommunication. The top and the bottom of the refrigerating chamber are respectively provided with an air inlet and an air return opening, and the air inlet is provided with a refrigerating air door so as to form air circulation with the freezing chamber. The evaporator is provided with a temperature sensor, the refrigerating fan, the refrigerating air door and the defrosting heater are respectively connected with the controller, the controller is used for controlling the opening and closing of the refrigerating fan, the refrigerating air door and the defrosting heater at different time points in a defrosting mode and a refrigerating mode respectively, hot air generated during defrosting and heating can be reduced to enter the freezing chamber, the temperature impact on the freezing chamber is reduced, and the problem that the temperature of the refrigerator chamber is increased in the defrosting process can be solved. Meanwhile, the first cold accumulation plate and the second cold accumulation plate absorb heat, so that the probability that heat generated in a defrosting mode of the refrigerator enters the freezing chamber can be reduced, and the temperature rise of the freezing chamber is reduced; the first cold accumulation plate absorbs heat, so that the concentration of hot air in the freezing chamber at the top in a shutdown mode of the refrigerator can be reduced, the temperature return speed of the freezing chamber is reduced, and the temperature fluctuation is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.

Fig. 1 is a schematic structural diagram of a refrigerator according to an embodiment of the present application;

FIG. 2 is a schematic view of a partial cross-sectional structure of a freezer compartment provided herein;

fig. 3 is a schematic structural view of a refrigerating chamber provided in the present application;

fig. 4 is a schematic view of a structure of a refrigerator with a freezing door opened;

fig. 5 is a flowchart of a refrigerator control method provided in the present application.

Reference numerals:

wherein, 1-freezing chamber; 101-a third cold accumulation plate; 2-a refrigerating chamber; 201-an air inlet; 202, an air return port; 3-an evaporator; 4-a first air duct; 401-a refrigeration fan; 402-a first air outlet; 403-a second cold accumulation plate; 5-defrost heater; 6-a second air duct; 601-a first cold accumulation plate; 603-a second air outlet; 604-an insulation board; 8-a controller.

Detailed Description

Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the examples below do not represent all embodiments consistent with the present application. Merely as examples of systems and methods consistent with some aspects of the present application as detailed in the claims.

The air-cooled refrigerator mainly adopts an electric heating mode to defrost the evaporator, for example, a defrosting heater can be adopted to heat and defrost the evaporator in a combined heat transfer mode of heat radiation, heat conduction and natural convection. However, experiments show that only 15% -20% of the heat emitted by the defrosting heater is effectively utilized, the rest heat is taken away by the structural components and the refrigerant and enters the refrigerating chamber through the air duct, so that the temperature of the refrigerating chamber rises too high in the defrosting process, the temperature impact on the stored food materials is large, and the fresh-keeping storage of the food materials is further affected. And the hot air in the refrigerator downtime room is concentrated at the top and gathered, so that the temperature fluctuation of a local area of the room is also caused to be large, and the fresh-keeping storage of food materials is further affected.

In order to solve the problem that the temperature of the refrigerator compartment is increased in the defrosting process, some embodiments of the present application provide a refrigerator, referring to fig. 1, fig. 1 is a schematic diagram of a refrigerator provided in the present application, including: the freezing chamber 1 and the refrigerating chamber 2 can be arranged in a left-right split structure, namely, the freezing chamber 1 is arranged on one side of the box body, and the refrigerating chamber 2 is arranged on the other side of the box body. One side of the freezing chamber 1 is provided with an evaporator 3, a first air duct 4, and a defrost heater 5. With one side of the refrigerator door as the front side of the refrigerator, the evaporator 3, the first air duct 4, and the defrost heater 5 may be disposed at the rear side of the freezing chamber 1 in some embodiments.

The evaporator 3 is used for refrigerating the freezing chamber 1 of the refrigerator, the first air duct 4 is arranged at the top end of the evaporator 3, the refrigerating fan 401 is arranged in the first air duct 4, and the refrigerating fan 401 can be arranged at the bottom of the first air duct 4, namely at the top end of the evaporator 3, so that the first air duct 4 can take away the cold energy of the evaporator 3, and then the cold energy is conveyed to the freezing chamber 1 and the refrigerating chamber 2, and the cooling of a refrigerator compartment is realized. Since the evaporator 3 needs to periodically remove ice or frost on its surface to perform a normal cooling function, a defrost heater 5 is provided at the bottom end of the evaporator 3 to heat the evaporator 3 and defrost the evaporator 3.

The top surface of freezer 1 is provided with second wind channel 6, and the one end in second wind channel 6 communicates first wind channel 4, and the other end in second wind channel 6 communicates with freezer 1. It will be appreciated that the first air duct 4 and the second air duct 6 are perpendicular. Referring to fig. 2, fig. 2 is a schematic partial sectional structure of the freezing chamber provided in the present application, a first air outlet 402 is provided at the top of the first air duct 4, and the second air duct 6 is communicated with the first air duct 4 through the first air outlet 402. In some embodiments, to reduce the probability of air leakage at the junction and icing, a sponge may be disposed around the first air outlet 402 to seal the junction between the first air duct 4 and the second air duct 6. The second air duct 6 is provided with the second air outlet 603 far away from the one end of first air duct 4, and the second air duct 6 is communicated with the freezing chamber 1 through the second air outlet 603. The first air duct 4 is communicated with the second air duct 6, and the second air duct 6 is communicated with the freezing chamber 1, so that the cold energy of the evaporator 3 can be discharged through the top end of the freezing chamber 1, and the cold energy is discharged from the top end of the freezing chamber 1 according to the cold energy sinking principle, so that the freezing chamber 1 can be refrigerated better.

With continued reference to fig. 2, the top and bottom surfaces of the second air duct 6 are provided with first cold accumulation plates 601, and a cavity between the two first cold accumulation plates 601 forms the second air duct 6. The coolant in the first cold accumulation plate 601 may absorb external heat, thereby lowering the temperature of air. After the hot air formed in the defrosting process of the evaporator 3 enters the second air duct 6 through the first air duct 4, the hot air and the two first cold accumulation plates 601 exchange heat fully, so that the temperature of the hot air can be reduced, and the probability of temperature rise of the freezing chamber 1 in the defrosting process of the evaporator 3 is reduced. In some embodiments, a thermal insulation board 604 may be further disposed on the bottom surface of the first cold accumulation board 601, and the thermal insulation board 604 may be made of sponge. By providing the heat insulation plate 604, the probability of frost formation of the first cold accumulation plate 601 at the bottom can be reduced in a state where the freezing chamber 1 is warmed or opened.

Referring to fig. 3, fig. 3 is a schematic structural diagram of a refrigerating chamber provided by the application, an air inlet 201 is provided at the top of the refrigerating chamber 2, an air return port 202 is provided at the bottom of the refrigerating chamber 2, and the freezing chamber 1 is communicated with the refrigerating chamber 2 through the air inlet 201 and the air return port 202, so as to realize air circulation in the freezing chamber 1 and the refrigerating chamber 2. The air inlet 201 is provided with a refrigerating air door, the refrigerating air door is an electric air door, and the opening and closing of the refrigerating air door are controlled by the controller 8, so that the air circulation of the refrigerating chamber 2 and the freezing chamber 1 can be controlled.

Referring again to fig. 2, in some embodiments, a second cold accumulation plate 403 may also be disposed inside the first wind tunnel 4, the second cold accumulation plate 403 being disposed between the cooling fan 401 and the first wind outlet 402. When the refrigerator enters the defrosting mode, in the heat exchange process of the hot and humid air formed in the defrosting process of the evaporator 3 and the two first cold accumulation plates 601, frost or ice may be formed on the surfaces of the first cold accumulation plates 601, and abnormal refrigeration of the refrigerator may be caused when serious, in order to avoid the phenomenon, the second cold accumulation plates 403 are arranged above the refrigerating fans 401 in the first air channels 4, and the hot and humid air formed in the defrosting process of the evaporator 3 firstly passes through the second cold accumulation plates 403 to cool and dehumidify and then enters the second air channels 6, so that the frosting quantity of the first cold accumulation plates 601 can be reduced. And when the frost or ice formed on the surface of the second cold accumulation plate 403 melts, the frost or ice is discharged out of the refrigerator through the evaporator 3, so that the use reliability of the refrigerator is not affected.

The evaporator 3 is provided with a temperature sensor for detecting the temperature of the evaporator 3. The temperature sensor, the cooling fan 401, the refrigerating damper and the defrosting heater 5 are respectively connected with the controller 8, and when the evaporator 3 needs defrosting heating, the controller 8 is used for: acquiring a working mode of the refrigerator, wherein the working mode comprises a defrosting mode and a refrigerating mode; when the working mode is a defrosting mode, sending an opening instruction to the refrigeration air door so as to control the refrigeration air door to be opened for a first preset time; sending a closing instruction to the refrigeration fan 401 and the refrigeration damper respectively to control the refrigeration fan 401 and the refrigeration damper to be closed; sending an opening command to the defrosting heater 5 to control the defrosting heater 5 to be opened for a second preset time; sending a closing instruction to the defrosting heater 5 to control the defrosting heater 5 to be closed, and sending an opening instruction to the refrigeration air door to control the refrigeration air door to be opened; when the working mode is a refrigeration mode, sending an opening instruction to a compressor of the refrigerator so as to control the opening of the compressor; acquiring the temperature of the evaporator 3 acquired by the temperature sensor, and sending an opening instruction to the refrigeration fan 401 when the temperature is smaller than a temperature threshold value so as to control the refrigeration fan 401 to be opened; and simultaneously sending a closing instruction to the refrigeration air door to control the refrigeration air door to be closed.

Illustratively, when the evaporator 3 is required to defrost, the refrigerator enters a defrost mode and the compressor stops, at which time the controller acquires the operating mode of the refrigerator and starts the following control. The refrigeration fan 401 continues to maintain the working state, synchronously opens the refrigeration air door, so that the air in the refrigeration chamber 2 enters the freezing chamber 1, and after the refrigeration air door is opened for a first preset time, the air temperature in the refrigeration chamber 2 is higher than the air temperature in the freezing chamber 1, and the air path circulation is performed through the refrigeration chamber 2 and the evaporator 3, so that the temperature of the evaporator 3 and the surface thereof can be raised, the temperature of the evaporator 3 and the surface thereof at the heating starting time of the defrosting heater 5 can be raised, and the heating time of the defrosting heater 5 can be shortened.

The refrigerating fan 401 is closed, and meanwhile, the refrigerating air door is closed, so that the circulating channels of the refrigerating chamber 2 and the evaporator 3 are blocked by closing the refrigerating air door, the heat of the defrosting heater 5 can be greatly reduced from leaking to the refrigerating chamber 2 through the air inlet 201, and the heat utilization rate is improved. After that, the defrosting heater 5 is started, after the defrosting heater 5 heats for a second preset time, the evaporator 3 finishes defrosting, the defrosting heater 5 is closed, the refrigerating air door is opened again, and part of hot air in the evaporator 3 enters the refrigerating chamber 2 through the refrigerating air door, so that the hot air is reduced from entering the freezing chamber 1, and the temperature rise of the freezing chamber 1 in the defrosting process is reduced.

After the defrosting mode is finished, the refrigerator enters a refrigerating mode, the compressor is started, and the refrigerating fan 401 is started in a delayed manner in order to reduce the influence of the air temperature in the evaporator 3 on the temperature of the freezing chamber 1 due to the fact that the air temperature in the evaporator is higher. The temperature of the evaporator 3 is obtained through the temperature sensor, when the temperature of the air in the evaporator 3 is reduced to a lower temperature, the refrigerating fan 401 is started, and the refrigerating air door is synchronously closed, so that the freezing chamber 1 is refrigerated preferentially, and the temperature rise of the freezing chamber 1 in the defrosting process is reduced.

In some embodiments, the controller 8 is further configured to: acquiring a working mode of the refrigerator, wherein the working mode also comprises a shutdown mode; and when the working mode is the shutdown mode, sending an opening instruction to the refrigeration air door so as to control the refrigeration air door to be opened.

Illustratively, the refrigerator enters a shutdown mode, a refrigeration air door is opened, cold air in the evaporator 3 naturally flows to the middle lower part of the refrigeration chamber 2 through the air inlet 201, so that the temperature of the bottom of the refrigeration chamber 2 is reduced, and the temperature uniformity of the refrigeration chamber 2 is improved.

Referring to fig. 4, fig. 4 is a schematic structural view of a refrigerator when a freezing door is opened, the refrigerator further includes a freezing door disposed at the outer side of the freezing chamber 1, a third cold accumulation plate 101 is disposed on the inner side surface of the freezing door, and the third cold accumulation plate 101 is disposed at the top of the freezing door. When the refrigerator is in defrosting mode or shutdown mode, the heat load generated by the heat leakage of the back and top foaming layers of the freezing chamber 1 is absorbed by the cold source of the first cold accumulation plate 601 of the second air duct 6, so that the heat load of the upper space of the freezing chamber 1 can be reduced, and at this time, the heat load generated by the heat leakage of the upper door seal and the door foaming layers of the freezing chamber 1 becomes the main factor of the temperature return of the upper space of the freezing chamber 1, therefore, the third cold accumulation plate 101 is arranged at the top of the freezing door body, so as to achieve the purpose of reducing the temperature fluctuation of the freezing chamber 1. The third cold accumulation plate 101 may be disposed inside the door liner foaming layer or outside the door liner, and is not particularly limited in this application.

Some embodiments of the present application further provide a method for controlling a refrigerator, which is applied to the refrigerator provided in the foregoing embodiments, referring to fig. 5, fig. 5 is a flowchart of the method for controlling a refrigerator provided in the present application, where the method includes:

s10: the method comprises the steps of obtaining the working modes of the refrigerator, wherein the working modes comprise a defrosting mode and a refrigerating mode.

S20: and when the working mode is a defrosting mode, sending an opening instruction to the refrigeration air door so as to control the refrigeration air door to be opened for a first preset time.

S30: a closing command is sent to the cooling fan 401 and the refrigeration damper, respectively, to control the cooling fan 401 and the refrigeration damper to close.

S40: an on command is sent to the defrost heater 5 to control the defrost heater 5 to be on for a second preset time.

S50: a close command is sent to the defrost heater 5 to control the defrost heater 5 to close, while an open command is sent to the refrigeration damper to control the refrigeration damper to open.

S60: and when the working mode is a refrigeration mode, sending an opening instruction to a compressor of the refrigerator so as to control the opening of the compressor.

S70: acquiring the temperature of the evaporator 3 acquired by the temperature sensor, and sending an opening instruction to the refrigeration fan 401 when the temperature is smaller than a temperature threshold value so as to control the refrigeration fan 401 to be opened; and simultaneously sending a closing instruction to the refrigeration air door to control the refrigeration air door to be closed.

Since the refrigerator may be temporarily stopped when encountering some emergency, that is, the working mode of the refrigerator includes a stop mode in addition to a cooling mode, the method further includes:

acquiring a working mode of the refrigerator, wherein the working mode also comprises a shutdown mode;

and when the working mode is the shutdown mode, sending an opening instruction to the refrigeration air door so as to control the refrigeration air door to be opened.

As can be seen from the above technical solutions, the embodiments of the present application provide a refrigerator and a control method, where the refrigerator includes: the freezing chamber 1 and the refrigerating chamber 2, one side of the freezing chamber 1 is provided with an evaporator 3, a first air duct 4, and a defrosting heater 5. The first air duct 4 is arranged at the top end of the evaporator 3, the defrosting heater 5 is arranged at the bottom end of the evaporator 3, and the refrigerating fan 401 is arranged in the first air duct 4. The top of freezer 1 is provided with second wind channel 6, and the one end and the first wind channel 4 intercommunication of second wind channel 6, the other end and freezer 1 intercommunication. The top and bottom of the refrigerating chamber 2 are respectively provided with an air inlet 201 and an air return 202, and the air inlet 201 is provided with a refrigerating air door so as to form air circulation with the freezing chamber 1. The evaporator 3 is provided with a temperature sensor, the refrigerating fan 401, the refrigerating air door and the defrosting heater 5 are respectively connected with the controller 8, the controller 8 is used for respectively controlling the opening and closing of the refrigerating fan 401, the refrigerating air door and the defrosting heater 5 at different time points in a defrosting mode and a refrigerating mode, hot air generated during defrosting and heating can be reduced to enter the freezing chamber 1, the temperature impact on the freezing chamber 1 is reduced, and the problem that the temperature of the freezing chamber is increased in the defrosting process can be solved.

The foregoing detailed description of the embodiments is merely illustrative of the general principles of the present application and should not be taken in any way as limiting the scope of the invention. Any other embodiments developed in accordance with the present application without inventive effort are within the scope of the present application for those skilled in the art.

Claims (10)

1. A refrigerator, comprising: a freezing chamber (1) and a refrigerating chamber (2);

an evaporator (3), a first air duct (4) and a defrosting heater (5) are arranged on one side of the freezing chamber (1); the first air duct (4) is arranged at the top end of the evaporator (3), and the defrosting heater (5) is arranged at the bottom end of the evaporator (3); a refrigerating fan (401) is arranged in the first air duct (4);

the top surface of the freezing chamber (1) is provided with a second air channel (6), one end of the second air channel (6) is communicated with the first air channel (4), and the other end of the second air channel (6) is communicated with the freezing chamber (1);

an air inlet (201) is formed in the top of the refrigerating chamber (2), and an air return opening (202) is formed in the bottom of the refrigerating chamber (2); the freezing chamber (1) is communicated with the refrigerating chamber (2) through the air inlet (201) and the air return opening (202); a refrigerating air door is arranged at the air inlet (201);

the evaporator (3) is provided with a temperature sensor, and the temperature sensor, the refrigerating fan (401), the refrigerating air door and the defrosting heater (5) are respectively connected with a controller (8);

the controller (8) is configured to:

acquiring a working mode of the refrigerator, wherein the working mode comprises a defrosting mode and a refrigerating mode;

when the working mode is a defrosting mode, sending an opening instruction to the refrigeration air door so as to control the refrigeration air door to be opened for a first preset time;

sending closing instructions to the refrigeration fan (401) and the refrigeration air door respectively to control the refrigeration fan (401) and the refrigeration air door to be closed;

sending an opening instruction to the defrosting heater (5) so as to control the defrosting heater (5) to be opened for a second preset time;

sending a closing instruction to the defrosting heater (5) to control the defrosting heater (5) to be closed, and simultaneously sending an opening instruction to the refrigeration air door to control the refrigeration air door to be opened;

when the working mode is a refrigeration mode, sending an opening instruction to a compressor of the refrigerator so as to control the opening of the compressor;

acquiring the temperature of the evaporator (3) acquired by the temperature sensor, and sending an opening instruction to the refrigeration fan (401) when the temperature is smaller than a temperature threshold value so as to control the refrigeration fan (401) to be opened; and simultaneously sending a closing instruction to the refrigeration air door so as to control the refrigeration air door to be closed.

2. The refrigerator according to claim 1, characterized in that a first air outlet (402) is provided at the top of the first air duct (4), and the first air duct (4) communicates with the second air duct (6) through the first air outlet (402).

3. The refrigerator according to claim 2, characterized in that a second cold accumulation plate (403) is provided inside the first air duct (4), the second cold accumulation plate (403) being provided between the cooling fan (401) and the first air outlet (402).

4. The refrigerator according to claim 1, characterized in that a second air outlet (603) is arranged at one end of the second air duct (6) far away from the first air duct (4), and the second air duct (6) is communicated with the freezing chamber (1) through the second air outlet (603).

5. The refrigerator according to claim 1, characterized in that the top and bottom surfaces of the second air duct (6) are provided with first cold accumulation plates (601), and a cavity between two first cold accumulation plates (601) forms the second air duct (6).

6. The refrigerator according to claim 5, wherein a thermal insulation plate (604) is provided on the bottom surface of the first cold accumulation plate (601) of the bottom surface, and the thermal insulation plate (604) is made of sponge.

7. The refrigerator according to claim 1, further comprising a freezing door body provided outside the freezing chamber (1), a third cold accumulation plate (101) being provided on an inner side surface of the freezing door body, the third cold accumulation plate (101) being provided at a top of the freezing door body.

8. The refrigerator according to claim 1, wherein the controller (8) is further configured to:

acquiring a working mode of the refrigerator, wherein the working mode further comprises a shutdown mode;

and when the working mode is the shutdown mode, sending an opening instruction to the refrigeration air door so as to control the refrigeration air door to be opened.

9. A control method of a refrigerator, applied to the refrigerator of any one of claims 1 to 8, the method comprising:

acquiring a working mode of the refrigerator, wherein the working mode comprises a defrosting mode and a refrigerating mode;

when the working mode is a defrosting mode, sending an opening instruction to a refrigeration air door so as to control the refrigeration air door to be opened for a first preset time;

sending closing instructions to a refrigeration fan (401) and the refrigeration air door respectively to control the refrigeration fan (401) and the refrigeration air door to be closed;

sending an opening instruction to the defrosting heater (5) to control the defrosting heater (5) to be opened for a second preset time;

sending a closing instruction to the defrosting heater (5) to control the defrosting heater (5) to be closed, and simultaneously sending an opening instruction to the refrigeration air door to control the refrigeration air door to be opened;

when the working mode is a refrigeration mode, sending an opening instruction to a compressor of the refrigerator so as to control the opening of the compressor;

acquiring the temperature of the evaporator (3) acquired by a temperature sensor, and sending an opening instruction to the refrigeration fan (401) when the temperature is smaller than a temperature threshold value so as to control the refrigeration fan (401) to be opened; and simultaneously sending a closing instruction to the refrigeration air door so as to control the refrigeration air door to be closed.

10. The refrigerator control method of claim 9, further comprising:

acquiring a working mode of the refrigerator, wherein the working mode further comprises a shutdown mode;

and when the working mode is the shutdown mode, sending an opening instruction to the refrigeration air door so as to control the refrigeration air door to be opened.