CN114484994A

CN114484994A - Refrigerator and defrosting method

Info

Publication number: CN114484994A
Application number: CN202210184444.XA
Authority: CN
Inventors: 卢起彪; 邓涵; 陆文怡; 李凯; 牛二帅; 钟胜兵
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2022-02-24
Filing date: 2022-02-24
Publication date: 2022-05-13
Anticipated expiration: 2042-02-24
Also published as: CN114484994B

Abstract

The invention discloses a refrigerator and a defrosting method, wherein when the refrigerator and the defrosting method are used, the risk of frosting at a second heat exchange end can be reduced, or the refrigeration requirement of a first storage space can be ensured when the second heat exchange end frosts, so that the temperature fluctuation of the first storage space is reduced.

Description

Refrigerator and defrosting method

Technical Field

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

Background

When the air-cooled refrigerator is used, air in the refrigerator is cooled by the air duct and the air door, then is sent to each compartment and then returns to the evaporation chamber, and the circulation is carried out.

When circulating air in a traditional air-cooled refrigerator passes through a refrigerating chamber, the humidity of the circulating air is high, and when the circulating air returns to an evaporation chamber, the circulating air is easily condensed into frost on an evaporator to influence the performance of the refrigerator; because the frosting amount on the evaporator is increased, the traditional air-cooled refrigerator needs longer defrosting time when defrosting, and then the temperature fluctuation of the refrigerating chamber is easy to cause larger, and the food preservation is influenced.

Disclosure of Invention

On the basis, the refrigerator and the defrosting method are provided, and when the refrigerator and the defrosting method are used, the risk of frosting at the second heat exchange end can be reduced, or the refrigeration requirement of the first storage space can be ensured when the second heat exchange end frosts, and the temperature fluctuation of the first storage space is reduced.

The specific technical scheme is as follows:

in one aspect, the present application relates to a refrigerator comprising:

the heat exchange unit is provided with a heat exchange space, a refrigeration assembly and a heat exchanger, the heat exchanger is arranged in the heat exchange space and divides the heat exchange space into a refrigeration air duct and a heat exchange air duct, the heat exchanger comprises a first heat exchange end and a second heat exchange end which are mutually heat-conducting, the first heat exchange end is arranged in the heat exchange air duct, the second heat exchange end is arranged in the refrigeration air duct, and the refrigeration assembly is used for refrigerating and cooling air in the heat exchange air duct;

the refrigerating unit is provided with a first storage space, and the first storage space is communicated with the refrigerating air duct;

the first fan is used for driving the airflow positioned in the first storage space to pass through the second heat exchange end and then return to the first storage space through the refrigeration air channel; the second fan is used for driving air in the heat exchange air duct to blow towards the first heat exchange end;

the air door is arranged in the heat exchange air channel, is arranged on a path of air in the heat exchange air channel blowing to the first heat exchange end and is used for controlling the air quantity of the air in the heat exchange air channel blowing to the first heat exchange end;

the first temperature sensor is used for detecting the temperature at the second heat exchange end, and the second temperature sensor is used for detecting the air temperature at the first storage space; and

the controller is in communication connection with the first temperature sensor, the second temperature sensor, the first fan, the second fan and the air door, and controls the rotating speed of the first fan and/or the second fan and/or the opening of the air door according to temperature information detected by the first temperature sensor and the second temperature sensor so as to adjust the temperature of the second heat exchange end and the air temperature of the first storage space.

When the refrigerator is used, the air in the heat exchange air channel is cooled by the refrigerating assembly, the first heat exchange end can be cooled by the air in the heat exchange air channel under the action of the second fan, and the first heat exchange end and the second heat exchange end exchange heat to further cool the second heat exchange end. Circulating air between first storing space and the cold-stored wind channel circulates under the effect of first fan and flows to can obtain the cooling at the second heat transfer end department that is located cold-stored wind channel, so can ensure the low temperature of air in the first storing space. Furthermore, the heat exchanger separates the refrigeration air duct from the heat exchange air duct, and the cold quantity is transferred in a heat exchange mode between the first heat exchange end and the second heat exchange end, so that air with high humidity in the refrigeration air duct cannot directly enter the heat exchange air duct, frost cannot be formed at the refrigeration assembly, and the frost forming amount of the refrigeration assembly can be reduced; furthermore, the first temperature sensor is used for detecting the temperature at the second heat exchange end, the second temperature sensor is used for detecting the air temperature at the first storage space, and the controller controls the rotating speed of the first fan and/or the second fan and/or the opening of the air door according to the temperature information detected by the first temperature sensor and the second temperature sensor so as to adjust the temperature of the second heat exchange end and the air temperature of the first storage space, so that the risk of frosting at the second heat exchange end is reduced, or the refrigeration requirement of the first storage space can be ensured when the second heat exchange end frosts, and the temperature fluctuation of the first storage space is reduced.

The technical solution is further explained below:

in one embodiment, the refrigeration assembly includes an evaporator and a compressor, the evaporator is disposed in the heat exchange air duct, the compressor and the evaporator are communicated with each other so that the evaporator can reduce the air temperature in the heat exchange air duct, the compressor is in communication connection with the controller, and the second fan is configured to drive at least part of the air flow in the heat exchange air duct to flow through the evaporator and then blow towards the first heat exchange end for heat exchange.

In one embodiment, the heat exchange unit further comprises a first air return duct, the air return opening of the evaporator is communicated with the heat exchange duct through the first air return duct, and the first air return duct is used for collecting the air after heat exchange with the first heat exchange end of the heat exchanger back to the evaporator.

In one embodiment, the refrigerator further comprises a freezing unit, the freezing unit is provided with a second storage space and a freezing air duct, the heat exchange air duct is provided with a freezing air port, and the freezing air duct is used for communicating the freezing air port with the second storage space.

In one embodiment, the refrigeration unit further comprises a second return air duct, the return air inlet of the evaporator is communicated with the return air inlet of the second storage space through the second return air duct, and the second return air duct is used for collecting the heat-exchanged air in the second storage space back to the evaporator.

In one embodiment, the first storage space is formed with a refrigerating compartment, and the second temperature sensor is used for detecting the temperature of air in the refrigerating compartment.

In one embodiment, the heat exchanger is one of a finned heat exchanger, a heat pipe heat exchanger and a plate-fin heat exchanger.

In another aspect, the present application also relates to a defrosting method for a refrigerator in any of the above embodiments, including the steps of:

detecting the temperature T3 of the second heat transfer end;

when T3 is detected to be less than or equal to 0 ℃, the rotating speed of the first fan is increased, and the opening degree of the air door is reduced, so that T3 is greater than 0 ℃; or the rotating speed of the first fan is increased, the opening degree of the air door is reduced, the rotating speed of the second fan is reduced, and the operating frequency of the compressor is reduced, so that T3 is greater than 0 ℃; the refrigeration assembly comprises an evaporator and a compressor, the evaporator is arranged in the heat exchange air duct, and the compressor is connected and communicated with the evaporator;

detecting the temperature T4 of the air in the first storage space;

when the T4 is detected to be greater than or equal to the set temperature of the first storage space, the rotating speed of the first fan is increased, the opening degree of the air door is increased, and the T3 is still maintained to be greater than 0 ℃; or the rotating speed of the first fan is increased, the opening degree of the air door is increased, the rotating speed of the second fan is increased, and the operating frequency of the compressor is increased, but the T3 is still maintained to be more than 0 ℃;

when the T4 is detected to be lower than the set temperature of the first storage space, the current running state of the refrigerator is maintained.

The technical solution is further explained below:

in one embodiment, when the T4 is detected to be greater than or equal to the set temperature of the first storage space, the rotating speed of the first fan is increased, the opening degree of the air door is increased, and the T3 is still maintained to be greater than 0 ℃; or the following steps are included after the steps of increasing the rotating speed of the first fan, increasing the opening degree of the air door, increasing the rotating speed of the second fan and increasing the operating frequency of the compressor, and still maintaining the temperature T3 to be more than 0 ℃:

when the T4 is detected to be still greater than or equal to the set temperature of the first storage space, the rotating speed of the first fan is continuously increased, and the opening degree of the air door is increased; or continuously increasing the rotating speed of the first fan, increasing the opening degree of the air door, increasing the rotating speed of the second fan and increasing the operating frequency of the compressor.

In one embodiment, when the T4 is detected to be still greater than or equal to the set temperature of the first storage space, the rotating speed of the first fan is continuously increased, and the opening degree of the air door is increased; or the steps of continuously increasing the rotating speed of the first fan, increasing the opening degree of the air door, increasing the rotating speed of the second fan and increasing the operating frequency of the compressor further comprise the following steps:

obtaining the duration T1 that the second heat exchange end of the heat exchanger is continuously in a state that T3 is less than or equal to 0 ℃;

when the duration T1 is greater than or equal to a set defrosting interval T2 of the refrigerator, closing the air door for a preset time period or reducing the opening degree of the air door until T3 is greater than 0 ℃; or closing the air door for a preset time period or reducing the opening of the air door, reducing the rotating speed of the second fan and reducing the operating frequency of the compressor until T3 is greater than 0 ℃.

When the defrosting method is used, the temperature T3 of the second heat exchange end is detected, when the temperature T3 is detected to be less than or equal to 0 ℃, the frosting risk exists at the second heat exchange end or the frosting already exists at the second heat exchange end, at the moment, the rotating speed of the first fan is increased to increase the air flow rate between the first storage space and the refrigerating air duct, the heat exchange efficiency of the air and the second heat exchange end is increased to increase the temperature of the second heat exchange end, the opening degree of the air door is reduced to reduce the cold energy of the heat exchange with the first heat exchange end to increase the temperature of the second heat exchange end, and the temperature T3 is more than 0 ℃; or when the rotating speed of the first fan is increased and the opening degree of the air door is reduced, the rotating speed of the second fan is reduced, and the operating frequency of the compressor is reduced, so that the cold quantity of the heat exchange with the first heat exchange end is further reduced, and the temperature of the second heat exchange end is increased, and the T3 is more than 0 ℃. Then, detecting the air temperature T4 in the first storage space, and when detecting that T4 is greater than or equal to the set temperature of the first storage space, indicating that the air temperature of the first storage space cannot meet the refrigeration requirement at the moment, increasing the rotating speed of the first fan to increase the air flow rate between the first storage space and the refrigeration air duct to increase the cold energy of the first storage space, and increasing the opening of the air door to increase the cold energy of heat exchange with the first heat exchange end to reduce the temperature of the second heat exchange end so as to reduce the air temperature in the first storage space, wherein T3 is still maintained to be greater than 0 ℃ at the moment to avoid frosting of the second heat exchange end; or when the rotating speed of the first fan is increased and the opening degree of the air door is increased, the rotating speed of the second fan is increased, the operating frequency of the compressor is increased, so that the cold quantity of heat exchange with the first heat exchange end is increased, the temperature of the second heat exchange end is reduced, and the T3 is still maintained to be more than 0 ℃; when T4 is detected to be smaller than the set temperature of the first storage space, the air temperature of the first storage space can meet the refrigeration requirement at the moment, the current running state of the refrigerator is further maintained, the frosting risk at the second heat exchange end is further reduced, or the temperature fluctuation of the first storage space can be reduced when the second heat exchange end frosts, and the refrigeration requirement of the first storage space is ensured.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without inventive labor.

Furthermore, the drawings are not to scale of 1:1, and the relative dimensions of the various elements in the drawings are drawn only by way of example and not necessarily to true scale.

Fig. 1 is a schematic view of an internal structure of a refrigerator according to an embodiment;

fig. 2 is a sectional view of one of views of a refrigerator according to an embodiment;

FIG. 3 is a cross-sectional view of an embodiment from another perspective;

FIG. 4 is a schematic structural diagram of a heat exchanger according to an embodiment;

FIG. 5 is a partially enlarged schematic view of a refrigerator according to an embodiment;

fig. 6 is a flowchart illustrating a defrosting method according to an embodiment.

Description of reference numerals:

10. a refrigerator; 100. a heat exchange unit; 110. a heat exchange air duct; 112. a first heat exchange air duct; 114. a second heat exchange air duct; 120. a refrigeration assembly; 122. an evaporator; 124. a compressor; 130. a heat exchanger; 132. a first heat exchanging end; 134. a second heat exchanging end; 140. a damper; 150. a first return air duct; 200. a refrigeration unit; 210. a refrigeration air duct; 220. a first storage space; 300. a freezing unit; 310. a second storage space; 410. a first fan; 420. a second fan; 500. a water pan.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

When circulating air in a traditional air-cooled refrigerator passes through a refrigerating chamber, the humidity of the circulating air is high, and when the circulating air returns to an evaporation chamber, the circulating air is easily condensed into frost on an evaporator to influence the performance of the refrigerator; because the frosting amount on the evaporator is increased, the defrosting time required by the traditional air-cooled refrigerator is longer when defrosting, and then the temperature fluctuation of the refrigerating chamber is easily caused to be larger, and the food preservation is influenced. Based on this, the application provides a refrigerator and a defrosting method, and when the refrigerator and the defrosting method are used, the risk of frosting at the second heat exchange end can be reduced, or the refrigeration requirement of the first storage space can be ensured when the second heat exchange end frosts, and the temperature fluctuation of the first storage space is reduced.

Referring to fig. 1 to 4, in an embodiment, a refrigerator 10 includes a heat exchange unit 100, the heat exchange unit 100 is provided with a heat exchange space (not shown), a refrigeration component 120 and a heat exchanger 130, the heat exchanger 130 is disposed in the heat exchange space to divide the heat exchange space into a refrigeration air duct 210 and a heat exchange air duct 110, the heat exchanger 130 includes a first heat exchanging end 132 and a second heat exchanging end 134 that are mutually heat-conductive, the first heat exchanging end 132 is disposed in the heat exchange air duct 110, the second heat exchanging end 134 is disposed in the refrigeration air duct 210, and the refrigeration component 120 is configured to refrigerate and cool air in the heat exchange air duct 110. Optionally, the heat exchanger 130 is one of a finned heat exchanger 130, a heat pipe heat exchanger 130, and a plate-fin heat exchanger 130.

It should be noted that the refrigerating air duct 210 and the heat exchange air duct 110 are separated by the heat exchanger 130, and the air between the refrigerating air duct 210 and the heat exchange air duct 110 does not flow through each other or flows less.

Referring to fig. 1 to 4, the refrigerator 10 further includes a refrigerating unit 200, the refrigerating unit 200 is provided with a first storage space 220, the first storage space 220 is communicated with the refrigerating air duct 210, and air between the first storage space 220 and the refrigerating air duct 210 can be communicated with each other; specifically, the refrigerator 10 further includes a first fan 410, the first fan 410 is configured to drive the airflow in the first storage space 220 to pass through the second heat exchanging point 134 and then return to the first storage space 220 through the refrigerating air duct 210, and since the second heat exchanging point 134 is disposed in the refrigerating air duct 210, the air in the refrigerating air duct 210 can exchange heat with the second heat exchanging point 134. The refrigerator 10 further includes a second fan 420, and the second fan 420 is configured to blow air in the heat exchange air duct 110 toward the first heat exchanging end 132 to exchange heat at the first heat exchanging end 132.

Referring to fig. 1, the refrigerator 10 further includes an air door 140, wherein the air door 140 is disposed in the heat exchange air duct 110, and is disposed on a path of the air in the heat exchange air duct 110 blowing toward the first heat exchanging end 132, and is used for controlling an amount of air blown toward the first heat exchanging end 132 by the air in the heat exchange air duct 110.

Specifically, referring to fig. 1, the heat exchange air duct 110 includes a first heat exchange air duct 112 and a second heat exchange air duct 114 that are communicated with each other, the second fan 420 is disposed in the first heat exchange air duct 112, the refrigeration component is configured to cool air in the first heat exchange air duct 112, the first heat exchanging end 132 and the air door 140 are disposed in the second heat exchange air duct 114, so that the second fan 420 is configured to drive air in the first heat exchange air duct 112, which has exchanged heat with the refrigeration component 120, to enter the second heat exchange air duct 114 for heat exchange with the first heat exchanging end 132, and at this time, the air door 140 controls an air volume blown into the second heat exchange air duct 114 by adjusting an opening of the air door 140. Alternatively, the first fan 410 may be a centrifugal fan or an axial fan, and the second fan 420 may be an axial fan or a centrifugal fan.

The refrigerator 10 further includes a first temperature sensor (not shown) for detecting a temperature at the second heat exchanging end 134, and a second temperature sensor (not shown) for detecting a temperature of air at the first storage space 220. Specifically, the first storage space 220 is formed with a refrigerating compartment, and the second temperature sensor is used to detect the temperature of air in the refrigerating compartment.

Optionally, the first temperature sensor and the second temperature sensor may be both temperature sensing bulbs or fiber optic sensors.

The refrigerator 10 further includes a controller (not shown) in communication with the first temperature sensor, the second temperature sensor, the first fan 410, the second fan 420 and the damper 140, and the controller controls the rotation speed of the first fan 410 and/or the second fan 420 and/or the opening of the damper 140 according to the temperature information detected by the first temperature sensor and the second temperature sensor to adjust the temperature of the second heat exchanging end 134 and the air temperature of the first storage space 220.

Alternatively, the controller may be a micro control unit or a single chip microcomputer. The communication connection mode can be an electrical connection mode or a wireless transmission mode.

When the refrigerator 10 is in use, the cooling component 120 cools the air in the heat exchanging air duct 110, so that the air in the heat exchanging air duct 110 cools the first heat exchanging end 132 under the action of the second fan 420, and the first heat exchanging end 132 exchanges heat with the second heat exchanging end 134 to cool the second heat exchanging end 134. The circulating air between the first storage space 220 and the refrigerating air duct 210 circularly flows under the action of the first fan 410, and can be cooled at the second heat exchanging end 134 of the refrigerating air duct 210, so that the low temperature of the air in the first storage space 220 can be ensured. Further, the heat exchanger 130 separates the refrigeration air duct 210 from the heat exchange air duct 110, and the first heat exchanging end 132 and the second heat exchanging end 134 transfer cold energy in a heat exchange manner, so that air with higher humidity in the refrigeration air duct 210 cannot directly enter the heat exchange air duct 110, frost cannot be formed at the refrigeration assembly 120, and meanwhile, the frost forming amount of the refrigeration assembly 120 can also be reduced; further, the first temperature sensor is used for detecting the temperature of the second heat exchanging end 134, the second temperature sensor is used for detecting the air temperature of the first storage space 220, and the controller controls the rotating speed of the first fan 410 and/or the second fan 420 and/or the opening degree of the air door 140 according to the temperature information detected by the first temperature sensor and the second temperature sensor so as to adjust the temperature of the second heat exchanging end 134 and the air temperature of the first storage space 220, so that the risk of frosting at the second heat exchanging end 134 is reduced, or the refrigeration requirement of the first storage space 220 can be ensured when the second heat exchanging end 134 frosts, and the temperature fluctuation of the first storage space 220 is reduced.

Referring to fig. 1, in some embodiments, the refrigeration assembly 120 includes an evaporator 122 and a compressor 124, the evaporator 122 is disposed in the heat exchange air duct 110, and the compressor 124 is connected and communicated with the evaporator 122. Air located within the heat exchange air duct 110 may exchange heat through the evaporator 122. Specifically, the evaporator 122 is disposed in the first heat exchange air duct 112.

Referring to fig. 1, the refrigerator 10 further includes a freezing unit 300, the freezing unit 300 is provided with a second storage space 310 and a freezing air duct (not shown), the heat exchanging air duct 110 is provided with a freezing air port (not shown), and the freezing air duct is used for communicating the freezing air port with the second storage space 310. In this way, the refrigerating air in the heat exchanging air duct 110 partially exchanges heat with the first heat exchanging end 132, and partially enters the freezing air duct through the freezing air opening and enters the second storage space 310 through the freezing air duct, so as to perform freezing storage on the food in the second storage space 310.

Specifically, the first heat exchange air duct 112 is provided with a freezing air port (not shown), when in use, part of the refrigerated air in the first heat exchange air duct 112 enters the second heat exchange air duct 114 to exchange heat with the first heat exchanging end 132 for cooling, and part of the refrigerated air in the first heat exchange air duct 112 enters the freezing air duct through the freezing air port and enters the second storage space 310 through the freezing air duct to freeze and store food in the second storage space 310.

Referring to fig. 1, in some embodiments, the heat exchange unit 100 further includes a first return air duct 150, the return air inlet of the refrigeration assembly 120 is communicated with the heat exchange air duct 110 through the first return air duct 150, and the first return air duct 150 is used for collecting the air after heat exchange with the first heat exchanging end 132 back to the evaporator 122. In this way, the air after heat exchange at the first heat exchanging end 132 can return to the evaporator 122 through the first return air duct 150 for cooling again, so as to be recycled.

Similarly, in some embodiments, the refrigeration unit 300 further comprises a second return air duct (not shown), through which the return air inlet of the refrigeration assembly 120 communicates with the return air inlet of the second storage space 310, the second return air duct being used for taking the heat exchanged air in the second storage space 310 back to the evaporator 122. In this way, the air after heat exchange in the second storage space 310 returns to the evaporator 122 through the second return air duct to be cooled again, and is continuously cooled again in the evaporator 122, so as to be recycled.

In addition to any of the foregoing embodiments, in some embodiments, the refrigerator 10 further includes a third temperature sensor (not shown), the refrigerating unit 200 is provided with an air inlet (not shown) communicated with the first storage space 220, the first storage space 220 is communicated with the refrigerating air duct 210 through the air inlet, and the third temperature sensor is used for detecting the air temperature at the air inlet. Alternatively, the third temperature sensor may be a fiber optic sensor or a bulb.

The temperature at the air inlet is detected by the third temperature sensor, and when the temperature at the air inlet is detected by the third temperature sensor to be too low, for example, lower than 0 ℃, the heat exchange air volume with the first heat exchanging end 132 is adjusted by driving the first fan 410 to rotate in an accelerated manner or by controlling the opening degree of the air door 140 in the foregoing embodiment.

It is understood that the third temperature sensor may be in communication with the controller, such that the opening degree of the damper 140 and the rotation speed of the first fan 410 are controlled by the controller receiving the temperature information detected by the third temperature sensor. Specifically, the controller may be a micro control unit or a single chip microcomputer.

In some embodiments, the refrigerator 10 further comprises a fourth temperature sensor (not shown), the refrigeration unit 200 is provided with a refrigeration return air inlet (not shown) communicated with the first storage space 220, the first storage space 220 is communicated with the refrigeration air duct 210 through the refrigeration return air inlet, and the fourth temperature sensor is used for detecting the temperature of air at the refrigeration return air inlet. Alternatively, the fourth temperature sensor may be a fiber optic sensor or a bulb.

In the foregoing embodiment, the air temperature at the air inlet is detected by the third temperature sensor, the air temperature at the cold storage air return inlet is detected by the fourth temperature sensor, and the uniformity of the temperature of the air in the first storage space 220 can be determined by calculating the difference between the air temperature at the cold storage air return inlet and the air temperature at the air inlet. When the difference between the first storage space and the second storage space is larger, it is determined that the uniformity is poor, that is, the flow rate of the air between the first storage space 220 and the refrigerating duct 210 can be increased by adjusting the rotation speed of the first fan 410. When the difference between the two is within the preset range, the refrigerator 10 can be kept in the current operation state.

Specifically, the fourth temperature sensor may be in communication connection with the controller in the foregoing embodiment, and the controller receives the temperatures detected by the third temperature sensor and the fourth temperature sensor and calculates a difference therebetween, so as to control the rotation speed of the first fan 410 according to the magnitude of the difference.

Referring to fig. 1 and 5, based on the foregoing embodiment, the refrigerator 10 further includes a water pan 500, and the water pan 500 is used for receiving water dropped from the second heat exchanging end 134. The water pan 500 is provided with a drain hole.

Referring to fig. 6, a defrosting method includes the following steps:

l100: detecting the temperature T1 of the second heat exchanging end 134;

in particular, the temperature at the second heat exchanging end 134 may be detected by a corresponding fourth sensor.

L200: when T1 is detected to be less than or equal to 0 ℃, the rotating speed of the first fan 410 is increased, and the opening degree of the air door 140 is reduced, so that T1 is greater than 0 ℃; or the rotating speed of the first fan 410 is increased, the opening degree of the damper 140 is reduced, the rotating speed of the second fan 420 is reduced, and the operating frequency of the compressor 124 is reduced, so that T1 is greater than 0 ℃, wherein the refrigeration assembly 120 comprises an evaporator 122 and a compressor 124, the evaporator 122 is arranged in the first heat exchange air duct 112, and the compressor 124 is connected and communicated with the evaporator 122.

When the temperature T1 is less than or equal to 0 ℃, it is indicated that frost will form at the second heat exchanging end 134, the flow rate of air between the first storage space 220 and the refrigerating air duct 210 can be driven to increase by increasing the rotation speed of the first fan 410, and the heat exchange efficiency between the air and the second heat exchanging end 134 is further increased, so that the temperature of the second heat exchanging end 134 is increased; meanwhile, by reducing the opening degree of the air door 140 and the rotating speed of the second fan 420, the cold quantity of heat exchange with the first heat exchanging end 132 can be reduced, and therefore the temperature of the second heat exchanging end 134 is increased.

Specifically, the rotation speed of the first fan 410, the opening degree of the damper 140, and the operating frequency of the compressor 124 may be controlled by the controller in the foregoing embodiment.

L300: the temperature T2 of the air in the first storage space 220 is detected. After the temperature of the second heat exchanging end 134 is raised, the temperature of the air in the first storage space 220 is affected, and the temperature of the air in the first storage space 220 is detected by the third sensor in the foregoing embodiment.

L400: when the T2 is detected to be greater than or equal to the set temperature of the first storage space 220, the rotating speed of the first fan 410 is increased, the opening degree of the air door 140 is increased, and the T1 is still maintained to be greater than 0 ℃; or increasing the rotational speed of the first fan 410, increasing the opening of the damper 140, increasing the rotational speed of the second fan 420, increasing the operating frequency of the compressor 124, but still maintaining T1 > 0 ℃.

When T2 is greater than or equal to the set temperature of the first storage space 220, it indicates that the air temperature in the first storage space 220 cannot satisfy the cooling requirement of the first storage space 220. Based on the foregoing description, the opening degree of the damper 140 can increase the cooling capacity of the heat exchange with the first heat exchanging end 132, and the rotation speed of the first fan 410 is increased to accelerate the air flow in the first storage space 220, so as to reduce the air temperature in the first storage space 220, but at this time, T1 must be maintained to be greater than 0 ℃, so as to avoid the second heat exchanging end 134 from frosting. The rotating speed of the first fan 410 is increased, the opening degree of the air door 140 is increased, meanwhile, the rotating speed of the second fan 420 is also increased, and the operating frequency of the compressor 124 is increased to increase the cooling capacity for heat exchange of the first heat exchanging end 132, but at the moment, T1 is required to be maintained to be more than 0 ℃, and frosting of the second heat exchanging end 134 is avoided.

L500: when it is detected that T2 is less than the set temperature of the first storing space 220, the current operation state of the refrigerator 10 is maintained.

When the defrosting method is used, the temperature T1 of the second heat exchanging end 134 is detected, when the temperature T1 is detected to be less than or equal to 0 ℃, it is indicated that the second heat exchanging end 134 is at risk of frosting or frosting exists at the moment, the rotating speed of the first fan 410 is increased to increase the air flow rate between the first storage space 220 and the refrigerating air duct 210, the heat exchange efficiency of the air and the second heat exchanging end 134 is increased to increase the temperature of the second heat exchanging end 134, the opening degree of the air door 140 is reduced to reduce the cold energy exchanging with the first heat exchanging end 132 to increase the temperature of the second heat exchanging end 134, and T1 is greater than 0 ℃; or when the rotating speed of the first fan 410 is increased and the opening degree of the air door 140 is reduced, the rotating speed of the second fan 420 is reduced and the operating frequency of the compressor 124 is reduced, so that the cold energy exchanging with the first heat exchanging end 132 is further reduced to increase the temperature of the second heat exchanging end 134, and the T1 is more than 0 ℃. Subsequently, detecting an air temperature T2 in the first storage space 220, and when detecting that T2 is greater than or equal to a set temperature of the first storage space 220, which indicates that the air temperature of the first storage space 220 cannot meet a refrigeration requirement at this time, increasing the rotation speed of the first fan 410 to increase the air flow rate between the first storage space 220 and the refrigeration air duct 210 to increase the cold energy of the first storage space 220, and increasing the opening degree of the air door 140 to increase the cold energy of heat exchange with the first heat exchanging end 132 to reduce the temperature of the second heat exchanging end 134, so as to reduce the air temperature in the first storage space 220, but to avoid frosting of the second heat exchanging end 134, at this time, still maintaining T1 > 0 ℃; or when the rotating speed of the first fan 410 is increased, the opening degree of the air door 140 is increased, the rotating speed of the second fan 420 is increased, and the operating frequency of the compressor 124 is increased, so that the cold energy of heat exchange with the first heat exchange end 132 is increased, the temperature of the second heat exchange end 134 is reduced, and the temperature T1 is still maintained to be greater than 0 ℃; when it is detected that T2 is less than the set temperature of the first storage space 220, it indicates that the air temperature of the first storage space 220 can meet the refrigeration requirement, so as to maintain the current operation state of the refrigerator 10, thereby reducing the risk of frosting at the second heat exchanging end 134 or reducing the temperature fluctuation of the first storage space when frosting at the second heat exchanging end 134, and ensuring the refrigeration requirement of the first storage space.

In some embodiments, the following steps are also included after L400:

l600: when the T2 is detected to be still greater than or equal to the set temperature of the first storage space 220, the rotating speed of the first fan 410 is continuously increased, and the opening degree of the air door 140 is increased; or the rotation speed of the first fan 410 is continuously increased, the opening degree of the damper 140 is increased, the rotation speed of the second fan 420 is increased, and the operation frequency of the compressor 124 is increased. Thus, the temperature of the first storage space 220 is reduced.

It should be noted that when it is detected that T2 is still greater than or equal to the set temperature of the first storage space 220, and the temperature of the first storage space 220 is reduced by the method of the foregoing embodiment, the temperature T1 of the second heat exchanging end 134 may be less than or equal to 0 ℃, so as to preferentially ensure that the temperature of the first storage space 220 meets the refrigeration requirement.

In some embodiments, after L600, further comprising:

l700: obtaining the duration time T1 that the second heat exchange end 134 is continuously in a state that T1 is less than or equal to 0 ℃;

in particular, the duration t1 may be calculated by a corresponding timing module.

L800: when the duration T1 is greater than or equal to the set defrost interval T2 of the refrigerator 10, closing the damper 140 for a preset period of time or reducing the opening of the damper 140 until T1 > 0 ℃; alternatively, the damper 140 is closed for a preset period of time or the opening of the damper 140 is decreased, and the rotational speed of the second fan 420 is decreased, decreasing the operating frequency of the compressor 124 until T1 > 0 ℃. At this time, the refrigerator 10 enters the defrosting mode, and the cooling capacity of the first heat exchanging end 132 can be reduced by closing the damper 140 or reducing the opening degree of the damper 140, reducing the rotation speed of the second fan 420 or reducing the operating frequency of the compressor 124, so as to increase the temperature of the second heat exchanging end 134.

The present application also relates to a temperature adjustment method applied to the refrigerator 10 in any of the foregoing embodiments, including the steps of:

s100: detecting the temperature T3 of the air delivered to the first storage space 220 by the refrigerating air duct 210;

specifically, T3 may be obtained by the third temperature sensor in the foregoing embodiment detecting the air temperature at the air intake.

S200: when T3 is detected to be less than or equal to 0 ℃, the rotating speed of the first fan 410 is increased; or increasing the rotation speed of the first fan 410 and decreasing the opening degree of the damper 140;

specifically, the rotation speed of the first fan 410 can be increased by the controller in the foregoing embodiment, and the opening degree of the damper 140 can also be controlled by the controller.

Based on the refrigerator 10 in the foregoing embodiment, the first fan 410 is disposed in the refrigerating air duct 210, the first fan 410 is configured to drive air between the first storage space 220 and the refrigerating air duct 210 to circularly flow and control an air flow rate, the air door 140 is located on a path of the heat exchange air duct 110 through which air is blown to the first heat exchanging end 132, and the air door 140 is configured to control an air volume of the refrigerating air in the heat exchange air duct 110 through which air is blown to the first heat exchanging end 132.

When the temperature adjusting method is used, the temperature T3 of the air conveyed to the first storage space 220 by the refrigerating air duct 210 is detected, when the temperature T3 is detected to be less than or equal to 0 ℃, the rotating speed of the first fan 410 is increased, at the moment, the flowing speed of the air between the first storage space 220 and the refrigerating air duct 210 can be accelerated, the heat exchange efficiency of the air and the second heat exchange end 134 is further improved, the temperature of the second heat exchange end 134 is increased to a certain extent, the temperature of the air between the first storage space 220 and the refrigerating air duct 210 is increased, and the phenomenon that food close to the air inlet of the first storage space 220 is frozen due to the fact that the temperature is too low is avoided; or when the rotating speed of the first fan 410 is increased, the opening degree of the air door 140 is reduced, so that the air volume for cooling the first heat exchange end 132 is reduced, the temperature of the second heat exchange end 134 is indirectly increased, and the phenomenon that food close to the first storage space 220 is frostbitten due to too low temperature at the air inlet is avoided.

The step of S200 includes the following steps:

when the temperature T3 is detected to be less than or equal to 0 ℃, detecting the current rotating speed of the first fan 410, and when the rotating speed of the first fan 410 is lower than the preset rotating speed, increasing the rotating speed of the first fan 410;

specifically, the rotation speed of the first fan 410 may be detected by detecting the rotation speed of the motor of the first fan 410.

When the rotating speed of the first fan 410 is detected to reach the first preset value and T3 is still detected to be less than or equal to 0 ℃, the opening degree of the air door 140 is reduced.

It should be noted that the preset rotation speed may be the maximum rotation speed of the first fan 410 or a value near the maximum rotation speed, or the preset rotation speed may be set according to the user's needs.

It can be understood that the opening degree of the damper 140 is reduced, so that the amount of heat exchanged to the first heat exchanging end 132 is reduced, which is not beneficial to maintaining the low temperature of the first storage space 220. When the temperature T3 is detected to be less than or equal to 0 ℃, if the rotating speed of the first fan 410 does not reach the first preset value, the rotating speed of the first fan 410 is preferably increased to increase the flow rate of the air between the first storage space 220 and the cold storage air duct 210, so that the value T3 is increased, and the opening degree of the air door 140 is maintained to maintain the cold energy exchanging with the first heat exchanging end 132. When the rotation speed of the first fan 410 has reached the first preset value, the opening degree of the damper 140 is decreased.

An embodiment also relates to a temperature adjusting method applied to the refrigerator 10 in any one of the preceding embodiments, including:

t100: detecting the temperature T4 of the air delivered to the first storage space 220 by the refrigerating air duct 210 and the temperature T5 of the air delivered to the refrigerating air duct 210 by the first storage space 220, wherein T5-T4 are recorded as delta T;

specifically, T4 may be obtained by detecting the air temperature at the air inlet by the third temperature sensor in the foregoing embodiments, and T5 may be obtained by detecting the air temperature at the refrigerated return air inlet by the fourth temperature sensor.

T200: when the Δ T is greater than or equal to the second preset value, increasing the rotation speed of the first fan 410;

specifically, the first fan 410 may be controlled by the controller in the foregoing embodiment to increase its rotation speed.

T300: when the Δ T is less than the second preset value, maintaining the current operation state of the refrigerator 10; the first fan 410 is disposed in the refrigerating air duct 210, and the first fan 410 is used for driving air between the first storage space 220 and the refrigerating air duct 210 to circularly flow and controlling the air flow rate.

It should be noted that the second preset value can be set according to the needs of the user.

When the temperature adjusting method is used, the temperature T4 of the air delivered to the first storage space 220 by the refrigerating air duct 210 and the temperature T5 of the air delivered to the refrigerating air duct 210 by the first storage space 220 are detected, wherein T5-T4 are denoted by Δ T, and the magnitude of Δ T reflects the temperature uniformity of the air between the first storage space 220 and the refrigerating air duct 210; when the Δ T is greater than or equal to the second preset value, it indicates that the temperature uniformity of the air between the first storage space 220 and the refrigerating air duct 210 is poor, and at this time, the flow of the air between the first storage space 220 and the refrigerating air duct 210 can be accelerated by increasing the rotation speed of the first fan 410; when the Δ T is smaller than the second preset value, it indicates that the temperature uniformity of the air between the first storage space 220 and the refrigerating air duct 210 is better, and at this time, the current operation state of the refrigerator 10 is maintained.

In one embodiment, the steps after T200 include:

detecting the temperature T6 of the first storage space 220;

specifically, the air temperature of the first storage space 220 may be detected by the second temperature sensor in the foregoing embodiment.

When T6 is detected to be less than or equal to the minimum value of the set temperature of the first storage space 220, the opening degree of the air door 140 is reduced; or the opening degree of the damper 140 is decreased, the rotation speed of the second fan 420 is decreased, and the operation frequency of the compressor 124 is decreased. When the temperature T6 is less than or equal to the minimum value of the set temperature of the first storage space 220, it indicates that the input cold energy in the first storage space 220 is large at this time and is not beneficial to the storage of food, and at this time, the cold energy exchanging heat with the first heat exchanging end 132 is adjusted by reducing the opening degree of the air door 140; or the opening degree of the air door 140 is reduced, and simultaneously, the rotating speed of the second fan 420 is reduced, and the running frequency of the compressor 124 is reduced, so that the cold energy exchanging with the first heat exchanging end 132 is further reduced.

When it is detected that T6 is within the range of the set temperature of the first storage space 220, the current operation state of the refrigerator 10 is maintained.

In addition, the range of the set temperature of the first storage space 220 is set according to the user's needs, and the refrigerator 10 includes the same step switch, and sets a corresponding temperature on the step switch.

Based on the structure of the refrigerator 10 in the foregoing embodiment, the air door 140 is located on a path where air in the heat exchange air duct 110 blows to the first heat exchanging end 132, the air door 140 is used to control an amount of air blown to the first heat exchanging end 132 by cooling air in the heat exchange air duct 110, the evaporator 122 is disposed in the heat exchange air duct 110, the compressor 124 is connected to and communicated with the evaporator 122, the evaporator 122 is used to exchange heat with air in the heat exchange air duct 110, the second fan 420 is disposed in the heat exchange air duct 110, and the second fan 420 is used to drive air flow located in the heat exchange air duct 110 to blow to the first heat exchanging end 132 and control an amount of air in the heat exchange air duct 110 that exchanges heat with the first heat exchanging end 132.

When the refrigerator 10 is used, it is required to ensure that the humidity in the first storage space 220 is within the humidity set by the user, and since the humidity in the first storage space 220 fluctuates during the use of the refrigerator 10, the humidity in the first storage space 220 needs to be adjusted.

One of the embodiments is a humidity adjusting method applied to the refrigerator 10 in any one of the embodiments, including the steps of:

h100: detecting the current humidity H1 of the first storage space 220;

specifically, the humidity of the first storage space 220 may be detected by a humidity sensor.

H200: when the humidity H1 of the first storage space 220 is detected to be greater than or equal to the set humidity H0 of the first storage space 220, the opening degree of the air door 140 is lifted, and the rotating speed of the first fan 410 is reduced;

specifically, the set humidity of the first storage space 220 may be set by a user on a humidity level switch of the refrigerator 10 during use, and the humidity level switch may include a plurality of levels such as 50%, 70%, 90% (or dry, normal, moisture-retaining).

H300: when it is detected that the current humidity H1 of the first storage space 220 is less than the set humidity H0 of the first storage space 220, the humidity H1 of the first storage space 220 is maintained at the required humidity.

Specifically, the required humidity may be 0.95H0-1.05H0, and of course, the specific size and range of the required humidity may be limited according to the needs of the user, which is not described herein in detail.

When the humidity adjusting method is used, the humidity H1 of the current first storage space 220 is detected, and when the humidity H1 of the current first storage space 220 is detected to be greater than or equal to the set humidity H0 of the first storage space 220, it is indicated that the humidity of the first storage space 220 is high, dehumidification is required, at this time, the opening of the air door 140 is increased, the cold quantity of heat exchange of the first heat exchanging end 132 is increased to reduce the temperature of the second heat exchanging end 134, and the rotating speed of the first fan 410 is reduced to reduce the heat exchange efficiency between the circulating air in the first storage space 220 and the refrigerating air duct 210 and the second heat exchanging end 134, so that the temperature of the second heat exchanging end 134 is reduced, the air in the first storage space 220 is condensed or frosted, and the humidity of the first storage space 220 is reduced.

Further, when it is detected that the humidity H1 of the first storage space 220 is greater than or equal to the set humidity H0 of the first storage space 220, the opening degree of the damper 140 is increased, the rotation speed of the first fan 410 is reduced, and meanwhile, when it is ensured that the temperature of the air in the first storage space 220 is not lower than the set temperature of the first storage space 220, the operation frequency of the compressor 124 is increased, so that the surface temperature of the second heat exchanging end 134 is reduced, and the air in the first storage space is condensed into water or frost.

In some embodiments, the step at H300 comprises:

when the humidity H1 of the first storage space 220 is detected to be lower than the set humidity H0 of the first storage space 220, the temperature T7 of the second heat exchanging end 134 and the air temperature T8 of the first storage space 220 are detected, and the dew point temperature T9 of the air in the first storage space 220 in the current temperature and humidity environment is calculated according to T8 and H0;

specifically, the dew point temperature is directly obtained by back calculation through a saturated water vapor pressure formula. For example, the calculation can be performed by using the Goff-Gratch formula recommended by the world weather organization, and the specific calculation process is not described herein too much.

When T7 is detected to be more than or equal to T9, the running state of the refrigerator 10 is maintained;

when T7 < T9 is detected, the opening degree of the damper 140 is decreased, and the rotation speed of the first fan 410 is increased. When T7 is less than T9, it indicates that water vapor in the air in the refrigerating air duct 210 will condense into water or frost at the second heat exchanging end 134, at this time, the opening degree of the damper 140 may be reduced to reduce the amount of heat exchanged with the first heat exchanging end 132, and the rotation speed of the first fan 410 is increased to improve the heat exchange efficiency between the air in the refrigerating air duct 210 and the second heat exchanging end 134, so as to increase the temperature T7 of the second heat exchanging end 134.

Specifically, similar to the previous embodiment, the opening degree of the damper 140 and the rotation speed of the first fan 410 may be adjusted by the controller.

Since the temperature of the second heat exchanging end 134 is increased correspondingly when the opening degree of the air door 140 is reduced and the rotation speed of the first fan 410 is increased, it is required to ensure that the temperature of the first storage space 220 is within the set temperature.

For example, in some embodiments, the step of decreasing the opening degree of the damper 140 and increasing the rotation speed of the first fan 410 when T7 < T9 is detected further comprises:

detecting the current air temperature T10 of the first storage space 220, and when the temperature T10 is less than the set temperature of the first storage space 220, reducing the rotating speed of the second fan 420 and the operating frequency of the compressor 124; the evaporator 122 is disposed in the first heat exchange air duct 112, and the compressor 124 is connected and communicated with the evaporator 122. At this time, it is explained that when T7 < T9 is detected, the cooling requirement of the first storage space 220 can still be ensured by implementing the measure of reducing the opening degree of the damper 140 and increasing the rotation speed of the first fan 410, and at this time, the temperature of the second heat exchanging end 134 is increased by reducing the rotation speed of the second fan 420 and reducing the operation frequency of the compressor 124, so as to avoid the humidity reduction of the first storage space 220.

Specifically, similar to the previous embodiment, the operating frequency of the compressor 124 and the rotational speed of the second fan 420 may be adjusted by the controller.

It should be noted that, when it is detected that T7 < T9, the air temperature in the first storage space 220 is obtained after the temperature T7 of the second heat exchanging end 134 is raised after the rotation speed of the first fan 410 is raised by reducing the opening degree of the damper 140.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A refrigerator, characterized by comprising:

2. The refrigerator according to claim 1, wherein the cooling assembly includes an evaporator and a compressor, the evaporator is disposed in the heat-exchanging air duct, the compressor and the evaporator are communicated with each other so that the evaporator can reduce the temperature of the air in the heat-exchanging air duct, the compressor is communicatively connected to the controller, and the second fan is configured to drive at least a portion of the air flow in the heat-exchanging air duct to flow through the evaporator and then blow the air flow to the first heat-exchanging end for heat exchange.

3. The refrigerator of claim 2, wherein the heat exchanging unit further comprises a first return air duct, the return air inlet of the evaporator is communicated with the heat exchanging air duct through the first return air duct, and the first return air duct is used for collecting the air after heat exchanging with the first heat exchanging end of the heat exchanger back to the evaporator.

4. The refrigerator as claimed in claim 2, further comprising a freezing unit, wherein the freezing unit is provided with a second storage space and a freezing air duct, the heat exchange air duct is provided with a freezing air port, and the freezing air duct is used for communicating the freezing air port with the second storage space.

5. The refrigerator of claim 4, wherein the freezer unit further comprises a second return air duct, wherein the return air inlet of the evaporator is in communication with the return air inlet of the second storage space through the second return air duct, and the second return air duct is configured to take heat-exchanged air in the second storage space back to the evaporator.

6. The refrigerator according to any one of claims 1 to 5, wherein the first storage space is formed with a refrigerating compartment, and the second temperature sensor is configured to detect an air temperature in the refrigerating compartment.

7. The refrigerator of any one of claims 1 to 5, wherein the heat exchanger is one of a finned heat exchanger, a heat pipe heat exchanger, and a plate-fin heat exchanger.

8. A defrosting method applied to the refrigerator of any one of claims 1 to 7, comprising the steps of:

detecting the temperature T3 of the second heat transfer end;

detecting the temperature T4 of the air in the first storage space;

9. The defrosting method of claim 8 wherein in step when it is detected that T4 is greater than or equal to the set temperature of the first storage space, the rotational speed of the first fan is increased, the opening of the damper is increased, but still maintaining T3 > 0 ℃; or the steps of increasing the rotating speed of the first fan, increasing the opening degree of the air door, increasing the rotating speed of the second fan, and increasing the operating frequency of the compressor, and still maintaining T3 to be more than 0 ℃ comprise the following steps:

10. The defrosting method according to claim 9, wherein when it is detected that T4 is still greater than or equal to the set temperature of the first storage space, the rotation speed of the first fan is continuously increased, and the opening degree of the damper is increased; or the steps of continuously increasing the rotating speed of the first fan, increasing the opening degree of the air door, increasing the rotating speed of the second fan and increasing the operating frequency of the compressor further comprise the following steps: