An evaporation box and a refrigerator

Abstract

The utility model discloses an evaporative box and refrigerator relates to refrigeration technical field. The specific implementation mode of this refrigerator includes: including refrigerator body and evaporative box, the refrigerator body sets up refrigeration return air outlet and refrigeration air outlet, the evaporative box is connected with the refrigerator body through the refrigeration return air outlet and the refrigeration air outlet, opens defrosting air inlet (101) and defrosting air outlet (102) in response to defrosting instruction, closes the refrigeration return air outlet and the refrigeration air outlet, closes defrosting air inlet (101) and defrosting air outlet (102) in response to stop instruction, opens the refrigeration return air outlet and the refrigeration air outlet. This implementation mode can improve the security of refrigerator defrosting, guarantees the normal use of refrigerator components simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration technology, and in particular to an evaporator and a refrigerator. Background Technology

[0002] Air-cooled refrigerators use a fan to blow cold air generated by the evaporator into the refrigerator and freezer compartments. As the air flows through the low-temperature evaporator, the water vapor in it condenses and freezes on the evaporator surface, forming frost.

[0003] Frost is extremely harmful. Frost has very poor thermal conductivity, acting like a thick layer around the evaporator, causing a sharp decrease in its heat absorption efficiency. Thick frost can clog the gaps in the evaporator, hindering airflow and preventing cold air from reaching the refrigerator and freezer compartments, thus stopping the refrigerator from cooling. Therefore, it is essential to regularly remove frost from the evaporator.

[0004] Frost-free refrigerators primarily rely on automatic defrosting to prevent excessive frost buildup on the evaporator, which can negatively impact cooling performance. Currently, most refrigerators use electric heating defrosting or hot gas bypass defrosting.

[0005] In the process of realizing this utility model, the inventors discovered that the prior art has at least the following problems: both electric heating defrosting and hot gas bypass defrosting have low safety and are prone to damage to the components in the refrigerator. Utility Model Content

[0006] In view of this, the present invention provides an evaporator and a refrigerator, which can improve the safety of refrigerator defrosting and ensure the normal use of the refrigerator components.

[0007] To achieve the above objectives, according to one aspect of the present invention, an evaporator is provided, the evaporator being provided with a defrost air inlet, a defrost air outlet and an evaporator, wherein both the defrost air inlet and the defrost air outlet are connected to the outside of the evaporator;

[0008] In response to a defrost command, the defrost air inlet and the defrost air outlet are opened;

[0009] The outside air of the evaporator passes through the defrost air inlet and the evaporator, and is discharged to the outside of the evaporator through the defrost air outlet.

[0010] In response to the stop command, the defrost air inlet and the defrost air outlet are closed.

[0011] The evaporator is also equipped with an evaporation fan;

[0012] The evaporator fan is located between the defrost air inlet and the evaporator.

[0013] The evaporator coil of the evaporator is equipped with a temperature sensor;

[0014] If the temperature from the temperature sensor exceeds the temperature threshold, the stop command is sent.

[0015] According to another aspect of the present invention, a refrigerator is provided, including a refrigerator body and the aforementioned evaporator;

[0016] The refrigerator body is equipped with a refrigeration return air vent and a refrigeration air outlet;

[0017] The evaporator is connected to the refrigerator body through the refrigeration return air vent and the refrigeration air outlet;

[0018] In response to the defrost command, the refrigeration return air vent and the refrigeration outlet are closed;

[0019] In response to the stop command, the cooling return air vent and the cooling air outlet are opened.

[0020] The side panel of the refrigerator body and the five side panels of the evaporator box together form the evaporator box;

[0021] The refrigeration return air vent and the refrigeration outlet air vent are located in the side panel connecting the refrigerator body and the evaporator.

[0022] The refrigeration return air vent and the refrigeration air outlet are located in the side panels of the refrigerator body and the evaporator adjacent to the refrigerator body and the evaporator, respectively.

[0023] The defrosting air inlet is located on the side panel adjacent to the refrigeration return air inlet;

[0024] The defrost air outlet is located on the side panel adjacent to the cooling air outlet.

[0025] The evaporator housing is equipped with a torque motor, which includes a helical gear for damper 1 and a helical gear for damper 2.

[0026] The torque motor responds to the defrosting command by controlling the damper 1 linkage and the damper 1 drive shaft through the helical gear of damper 1 to close the cooling return air inlet and open the defrosting air inlet. It also controls the damper 2 linkage and the damper 2 drive shaft through the helical gear of damper 2 to close the cooling air outlet and open the defrosting air outlet. The rotating shaft of damper 1 is located between the cooling return air inlet and the defrosting air inlet, and the rotating shaft of damper 2 is located between the cooling air outlet and the defrosting air outlet.

[0027] In response to a stop command, the torque motor controls the damper 1 linkage and the damper 1 drive shaft to close the defrost air inlet and open the cooling air return outlet by means of the damper 1 helical gear 1. In addition, it controls the damper 2 linkage and the damper 2 drive shaft to close the defrost air outlet and open the cooling air outlet by means of the damper 2 helical gear 2.

[0028] The evaporator includes a torque motor 11, a torque motor 22, a damper 1 drive shaft disposed between the refrigeration return air inlet and the defrost air inlet, and a damper 2 drive shaft disposed between the refrigeration air outlet and the defrost air outlet.

[0029] In response to the defrosting command, the torque motor 11 controls the damper 1 drive shaft to drive the damper 1, closing the refrigeration return air inlet and opening the defrosting air inlet. In response to the defrosting command, the torque motor 22 controls the damper 2 drive shaft to drive the damper 2, closing the refrigeration air outlet and opening the defrosting air outlet.

[0030] In response to a stop command, the torque motor 11 controls the damper 1 drive shaft to close the defrost air inlet and open the cooling air return outlet. In response to a stop command, the torque motor 22 controls the damper 2 drive shaft to close the defrost air outlet and open the cooling air outlet.

[0031] The evaporator housing is located above the refrigerator housing.

[0032] One embodiment of the above-described utility model has the following advantages or beneficial effects: the evaporator is provided with a defrost air inlet, a defrost air outlet, and an evaporator, both of which are connected to the outside of the evaporator; in response to a defrost command, the defrost air inlet and the defrost air outlet are opened; external air from the evaporator passes through the defrost air inlet and is discharged to the outside of the evaporator through the defrost air outlet; in response to a stop command, the defrost air inlet and the defrost air outlet are closed. Defrosting is achieved externally by controlling the evaporator without the need for electrical equipment, improving the safety of refrigerator defrosting and ensuring the normal operation of refrigerator components.

[0033] The further effects of the aforementioned unconventional alternative methods will be explained below in conjunction with specific implementation methods. Attached Figure Description

[0034] The accompanying drawings are provided to better understand this utility model and do not constitute an undue limitation thereof. Wherein:

[0035] Figure 1 This is a schematic diagram of the main structure of the evaporator according to an embodiment of the present utility model;

[0036] Figure 2 This is a schematic diagram of the main structure of a refrigerator according to an embodiment of the present utility model;

[0037] Figure 3 This is a schematic diagram of a structure that uses a torque motor to control the damper according to an embodiment of the present utility model;

[0038] Figure 4 This is a schematic diagram of a damper controlled by two torque motors according to an embodiment of the present invention. Detailed Implementation

[0039] The following description, in conjunction with the accompanying drawings, illustrates exemplary embodiments of the present invention, including various details to aid understanding. These embodiments should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0040] Electric defrosting works by directly heating the evaporator with an installed electric heating element. This element is located below the evaporator. The heating element directly heats the evaporator fins and coils, melting the frost. As an example, a timer or main control board issues commands as planned or on demand. The electric heater is responsible for heating and defrosting. A defrost thermostat ensures safety and prevents overheating. A drain tray or condensate pan handles the water generated during defrosting. This process ensures the evaporator maintains maximum heat exchange efficiency, achieving a frost-free user experience and guaranteeing continuous and efficient cooling of the refrigerator.

[0041] Advantages of electric defrosting: simple structure, convenient control, and low cost. Disadvantages of electric defrosting: high energy consumption, large temperature fluctuations inside the chamber, which may affect food quality. In particular, the electric heating element directly heats the evaporator to defrost, and the high-voltage electricity connected to the chamber poses a safety hazard of electric shock.

[0042] Hot gas bypass defrosting involves directly introducing the high-temperature, high-pressure refrigerant gas discharged from the compressor into the evaporator for defrosting. Advantages: Utilizes the system's own heat, resulting in faster defrosting. Disadvantages: Using a four-way valve increases system complexity and the risk of leaks. Without a four-way valve, the gas bypasses the condenser, leading to shorter but less thorough defrosting, prolonged defrosting time, and the potential for liquid slugging that could damage the compressor.

[0043] To address the issue of low safety during defrosting, which can easily damage components inside the refrigerator, the following technical solutions from the embodiments of this utility model can be adopted.

[0044] See Figure 1 , Figure 1 This is a schematic diagram of the main structure of the evaporator according to an embodiment of the present utility model. Figure 1 As shown in Figure 100:

[0045] The evaporator is equipped with a defrost air inlet 101, a defrost air outlet 102, and an evaporator 103. Both the defrost air inlet 101 and the defrost air outlet 102 are connected to the outside of the evaporator.

[0046] The defrost air inlet 101 is connected to the outside of the evaporator, and outside air can enter the evaporator through the defrost air inlet 101.

[0047] The defrost outlet 102 is connected to the outside of the evaporator, and the air inside the evaporator can enter the outside of the evaporator through the defrost outlet 102.

[0048] In an embodiment of this invention, the controller in the evaporator can send a defrost command based on the defrost cycle. In response to the defrost command, the evaporator opens the defrost air inlet 101 and the defrost air outlet 102.

[0049] Frost forms on the evaporator 103 in the evaporator chamber, and the temperature inside the evaporator chamber is lower than the temperature outside the evaporator chamber. Opening the defrost air inlet 101 and the defrost air outlet 102 enables heat exchange between the internal and external air of the evaporator chamber.

[0050] Outside air enters the evaporator through the defrost inlet 101, passes through the evaporator 103, and is discharged to the outside of the evaporator through the defrost outlet 102. Since the temperature of the outside air is above zero degrees Celsius, the outside air through the defrost inlet 101 is used to defrost the evaporator 103, and the air inside the evaporator is discharged to the outside of the evaporator through the defrost outlet 102.

[0051] In response to a stop command, the evaporator closes the defrost inlet 101 and the defrost outlet 102. As an example, the controller in the evaporator can send a stop command based on a defrost cycle. At the end of a defrost cycle, the controller in the evaporator sends a stop command.

[0052] Continue to participate Figure 1 To accelerate airflow within the evaporator, an evaporator fan 104 is also installed. The evaporator fan 104 is positioned between the defrost air inlet 101 and the evaporator 103. This accelerates airflow within the evaporator while reducing condensate buildup in the evaporator fan 104.

[0053] In one embodiment of this invention, a temperature sensor is installed on the evaporator coil of the evaporator 103. If the temperature measured by the temperature sensor is greater than a temperature threshold, it indicates that the evaporator 103 has completed defrosting, and a stop command is sent. As an example, the temperature sensor sends the temperature to the controller of the evaporator chamber. If the controller determines that the temperature measured by the temperature sensor is greater than the temperature threshold, it sends a stop command.

[0054] See Figure 2 , Figure 2This is a schematic diagram of the main structure of a refrigerator according to an embodiment of the present utility model. Figure 2 This includes the refrigerator body and Figure 1 The evaporator box in the refrigerator. The interior space of the refrigerator is the space within the refrigerator cabinet.

[0055] Figure 2 The evaporator is located at the top of the refrigerator body. The evaporator can also be located at the bottom, left, or right of the refrigerator body.

[0056] The refrigerator body has a cooling return air vent and a cooling air outlet. The evaporator is connected to the refrigerator body through the cooling return air vent and the cooling air outlet. In other words, the cooling return air vent and the cooling air outlet are located inside the refrigerator body and the evaporator body.

[0057] In response to the defrost command, the defrost air inlet 101 and defrost air outlet 102 in the evaporator are opened, and the cooling return air inlet and cooling air outlet are closed. Defrosting is performed inside the evaporator using external air.

[0058] In response to the stop command, the defrost air inlet 101 and defrost air outlet 102 in the evaporator are closed, while the refrigeration return air vent and refrigeration air outlet are opened. After defrosting is complete, the refrigerator compartment's refrigeration function is turned on.

[0059] exist Figure 2 In this embodiment, the refrigerator body is connected to the evaporator box using a refrigeration return air vent and a refrigeration air outlet. The evaporator 103 is defrosted using external air in the evaporator box, which can improve the safety of refrigerator defrosting and ensure the normal use of the components in the refrigerator.

[0060] In one embodiment of this utility model, the evaporator and the refrigerator body share a side panel. (Continue to see...) Figure 2 , Figure 2 The top of the refrigerator serves as the lower side panel of the evaporator. In other words, the side panels of the refrigerator body and the five side panels of the evaporator together form the evaporator.

[0061] The refrigeration return air vent and the refrigeration air outlet are located in the side panel connecting the refrigerator body and the evaporator.

[0062] See also Figure 2 The refrigeration return air vent and the refrigeration air outlet are respectively located on the left and right sides of the side panel connecting the refrigerator body and the evaporator.

[0063] In one embodiment of this utility model, both the evaporator and the refrigerator body are separate, enclosed enclosures. The evaporator and the refrigerator body are arranged adjacent to each other. The refrigeration return air vent and the refrigeration air outlet are located in the side panels of the refrigerator body and the evaporator adjacent to each other.

[0064] In other words, the side panel adjacent to the evaporator of the refrigerator body is equipped with a cooling return air vent and a cooling air outlet; the side panel adjacent to the refrigerator body of the evaporator is equipped with a cooling return air vent and a cooling air outlet. In this way, the refrigerator body ensures cooling inside the refrigerator body through the cooling return air vent and the cooling air outlet.

[0065] In one embodiment of this utility model, in order to improve the switching speed of defrosting and refrigeration of the evaporator 103, a defrosting air inlet 101, a refrigeration return air inlet, a defrosting air outlet 102, and a refrigeration air outlet can be provided in the evaporator box.

[0066] Specifically, the defrost air inlet 101 is located on the side panel adjacent to the refrigeration return air inlet. The defrost air outlet 102 is located on the side panel adjacent to the refrigeration air outlet.

[0067] See also Figure 2 The refrigeration return air vent is located on the top left side of the refrigerator, and the defrost air inlet 101 is located below the side panel adjacent to the refrigeration return air vent. The refrigeration air outlet is located on the top right side of the refrigerator, and the defrost air outlet 102 is located below the side panel adjacent to the refrigeration air outlet. Figure 2 The defrosting air inlet 101 is closed and opened using damper 1, and the defrosting air outlet 102 is closed and opened using damper 2.

[0068] In one embodiment of this invention, the defrosting air inlet 101, the cooling return air inlet, the defrosting air outlet 102, and the cooling air outlet can be controlled by a motor to close and open. As an example, the motor may be one or more of the following: a torque motor, a linear motor, and a push rod motor.

[0069] See Figure 3 , Figure 3 This is a schematic diagram of a damper controlled by a torque motor according to an embodiment of the present invention. Figure 3 The system uses a torque motor to control two dampers via a helical gear output from the motor.

[0070] The evaporator housing is equipped with a torque motor, which includes a motor output helical gear, a damper 1 helical gear, and a damper 2 helical gear. Damper 1 helical gear controls damper 1, and damper 2 helical gear controls damper 2. As an example, damper 1 helical gear is right-handed, and damper 2 helical gear is left-handed. The right-hand motor output helical gear controls damper 1, and the left-hand motor output helical gear controls damper 2.

[0071] The right-hand motor output helical gear is coaxial with the left-hand motor output helical gear. The right-hand motor output helical gear runs in the same direction as the helical gear of damper 1. The left-hand motor output helical gear runs in the same direction as the helical gear of damper 2.

[0072] The torque motor responds to the defrosting command by controlling the damper 1 linkage and the damper 1 drive shaft through the helical gear of damper 1 to close the cooling return air inlet and open the defrosting air inlet 101. It also controls the damper 2 linkage and the damper 2 drive shaft through the helical gear of damper 2 to close the cooling air outlet and open the defrosting air outlet 102. The rotating shaft of damper 1 is located between the cooling return air inlet and the defrosting air inlet 101, and the rotating shaft of damper 2 is located between the cooling air outlet and the defrosting air outlet 102.

[0073] As an example, the pivot of damper 1 is located at the edge of the adjacent side panel of the cooling return air inlet and the defrost air inlet 101; the pivot of damper 2 is located at the edge of the adjacent side panel of the cooling outlet and the defrost air outlet 102.

[0074] And open

[0075] Figure 3 The dashed lines corresponding to the medium torque motor represent the state diagram of the refrigeration return air inlet and refrigeration outlet when the defrost inlet 101 and defrost outlet 102 are closed, and the state diagram of the damper 1 helical gear, damper 1 connecting rod, damper 1 drive shaft, damper 1, damper 2 helical gear, damper 2 connecting rod, damper 2 drive shaft, and damper 2.

[0076] In response to a stop command, the torque motor controls the damper 1 linkage and the damper 1 drive shaft via the helical gear of damper 1 to close the defrost air inlet 101 and open the cooling air return outlet. Additionally, it controls the damper 2 linkage and the damper 2 drive shaft via the helical gear of damper 2 to close the defrost air outlet 102 and open the cooling air outlet.

[0077] Figure 3 The solid lines corresponding to the medium torque motor represent the state diagram of the refrigeration return air inlet and refrigeration outlet air outlet when they are open and the defrost inlet air inlet 101 and defrost outlet air outlet 102 are closed. The diagram shows the state of the damper 1 helical gear, damper 1 connecting rod, damper 1 drive shaft, damper 1, damper 2 helical gear, damper 2 connecting rod, damper 2 drive shaft, and damper 2.

[0078] See Figure 4 , Figure 4 This is a schematic diagram of a damper controlled by two torque motors according to an embodiment of the present invention.

[0079] The evaporator is equipped with a torque motor 11 and a torque motor 22. As an example, the torque motor 11 is located on the edge of the adjacent side panel of the refrigeration return air inlet and the defrost air inlet 101; the torque motor 22 is located on the edge of the adjacent side panel of the refrigeration air outlet and the defrost air outlet 102.

[0080] The evaporator is equipped with a damper 1 drive shaft located between the refrigeration return air inlet and the defrost air inlet 101, and a damper 2 drive shaft located between the refrigeration outlet air inlet and the defrost outlet air inlet 102.

[0081] As an example, the drive shaft of damper 1 is located at the edge of the adjacent side plate of the refrigeration return air inlet and the defrost air inlet 101; the drive shaft of damper 2 is located at the edge of the adjacent side plate of the refrigeration outlet and the defrost outlet 102.

[0082] In response to the defrosting command, torque motor 11 controls the drive shaft of damper 1 to close the cooling return air inlet and open the defrosting air inlet 101. In response to the defrosting command, torque motor 22 controls the drive shaft of damper 2 to close the cooling air outlet and open the defrosting air outlet 102.

[0083] Figure 4 The dashed line at the refrigeration return air vent indicates that the refrigeration return air vent is closed and the defrost air inlet vent 101 is open, and the dashed line at the refrigeration outlet indicates that the refrigeration outlet is closed and the defrost outlet vent 102 is open.

[0084] In response to the stop command, torque motor 11 controls the drive shaft of damper 1 to close the defrost air inlet 101 and open the cooling return air inlet. In response to the stop command, torque motor 22 controls the drive shaft of damper 2 to close the defrost air outlet 102 and open the cooling air outlet.

[0085] Figure 4 The solid line of the defrost air inlet 101 indicates that the defrost air inlet 101 is closed and the cooling return air inlet is open, and the solid line of the defrost air outlet 102 indicates that the defrost air outlet 102 is closed and the cooling air outlet is open.

[0086] A drip tray is installed below the evaporator 103. Frost in the evaporator 103 melts into water through the outside air, and the evaporator 103 drains water through the drip tray.

[0087] In the above embodiment, the evaporator is provided with a defrost air inlet 101, a defrost air outlet 102, and an evaporator 103. Both the defrost air inlet 101 and the defrost air outlet 102 are connected to the outside of the evaporator. In response to a defrost command, the defrost air inlet 101 and the defrost air outlet 102 are opened. External air from the evaporator passes through the defrost air inlet 101 and the evaporator 103, and is then discharged to the outside of the evaporator through the defrost air outlet 102. In response to a stop command, the defrost air inlet 101 and the defrost air outlet 102 are closed. Defrosting in the evaporator 103 does not require electrical equipment; defrosting is achieved through external control of the evaporator, which improves the safety of refrigerator defrosting and ensures the normal operation of the refrigerator components.

[0088] This embodiment of the invention utilizes an evaporator to introduce external air, using the heat of the external air for defrosting. While defrosting, the refrigerator body is closed to isolate the defrosting space from the cooling space, thus completing defrosting without affecting the internal temperature changes of the cooling space, resulting in energy saving and environmental protection. It reduces energy consumption and improves energy efficiency.

[0089] Table 1 shows an example of using this utility model embodiment, using a four-door refrigerator with a volume of 1m³, an electric heating power of 600W, a defrosting cycle of 4 hours / time, 20 minutes / time, 6 times / day, calculated over 12 months and 360 days a year.

[0090]

[0091] Compared to a conventional four-door refrigerator, the technical solution described in this utility model embodiment saves 424.8 yuan in electricity costs per year, resulting in the following economic benefits:

[0092] Cost savings from 100 units: 424.8 yuan / year × 100 = 42,480 yuan / year.

[0093] Cost savings from 1000 units: 424.8 yuan / year × 1000 = 424,800 yuan / year.

[0094] Cost savings from 10,000 units: 424.8 yuan / year × 10,000 = 4.248 million yuan / year.

[0095] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can occur depending on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model. It should be noted that the acquisition, storage, and application of user personal information involved in the technical solutions disclosed herein comply with relevant laws and regulations and do not violate public order and good morals.

Claims

1. An evaporator, characterized in that, The evaporator is provided with a defrost air inlet (101), a defrost air outlet (102) and an evaporator (103). The defrost air inlet (101) and the defrost air outlet (102) are both connected to the outside of the evaporator. In response to the defrost command, the defrost air inlet (101) and the defrost air outlet (102) are opened. The outside air of the evaporator box passes through the defrost air inlet (101) and the evaporator (103), and is discharged to the outside of the evaporator box through the defrost air outlet (102); In response to the stop command, the defrost air inlet (101) and the defrost air outlet (102) are closed.

2. The evaporator according to claim 1, characterized in that, The evaporator is also equipped with an evaporation fan (104). The evaporator fan (104) is located between the defrost air inlet (101) and the evaporator (103).

3. The evaporator according to claim 1, characterized in that, The evaporator coil of the evaporator (103) is equipped with a temperature sensor; If the temperature from the temperature sensor exceeds the temperature threshold, the stop command is sent.

4. A refrigerator, characterized in that, Includes a refrigerator body and an evaporator as described in any one of claims 1 to 3; The refrigerator body is equipped with a refrigeration return air vent and a refrigeration air outlet; The evaporator is connected to the refrigerator body through the refrigeration return air vent and the refrigeration air outlet; In response to the defrost command, the refrigeration return air vent and the refrigeration outlet are closed; In response to the stop command, the cooling return air vent and the cooling air outlet are opened.

5. The refrigerator according to claim 4, characterized in that, The side panel of the refrigerator body and the five side panels of the evaporator box together form the evaporator box; The refrigeration return air vent and the refrigeration outlet air vent are located in the side panel connecting the refrigerator body and the evaporator.

6. The refrigerator according to claim 4, characterized in that, The refrigeration return air vent and the refrigeration air outlet are located in the side panels of the refrigerator body and the evaporator adjacent to the refrigerator body and the evaporator, respectively.

7. The refrigerator according to claim 4, characterized in that, The defrosting air inlet (101) is located on the side plate adjacent to the refrigeration return air inlet; The defrost air outlet (102) is located on the side panel adjacent to the refrigeration air outlet.

8. The refrigerator according to claim 7, characterized in that, The evaporator is equipped with a torque motor, which includes a damper (1) helical gear and a damper (2) helical gear; The torque motor responds to the defrosting command by controlling the damper (1) linkage and the damper (1) drive shaft through the damper (1) helical gear to close the cooling return air port and open the defrosting air inlet (101), and by controlling the damper (2) linkage and the damper (2) drive shaft through the damper (2) helical gear to close the cooling air outlet and open the defrosting air outlet (102). The rotating shaft of the damper (1) is located between the cooling return air port and the defrosting air inlet (101), and the rotating shaft of the damper (2) is located between the cooling air outlet and the defrosting air outlet (102). In response to a stop command, the torque motor controls the damper (1) linkage and the damper (1) drive shaft to close the defrost air inlet (101) and open the refrigeration return air inlet via the damper (1) helical gear, and controls the damper (2) linkage and the damper (2) drive shaft to close the defrost air outlet (102) and open the refrigeration air outlet via the damper (2) helical gear.

9. The refrigerator according to claim 7, characterized in that, The evaporator includes a torque motor (11), a torque motor (22), a damper (1) drive shaft disposed between the refrigeration return air inlet and the defrost air inlet (101), and a damper (2) drive shaft disposed between the refrigeration air outlet and the defrost air outlet (102). In response to the defrosting command, the torque motor (11) controls the damper (1) drive shaft to close the refrigeration return air inlet and open the defrosting air inlet (101). In response to the defrosting command, the torque motor (22) controls the damper (2) drive shaft to close the refrigeration air outlet and open the defrosting air outlet (102). In response to a stop command, the torque motor (11) controls the damper (1) drive shaft to close the defrost air inlet (101) and open the refrigeration return air inlet. In response to a stop command, the torque motor (22) controls the damper (2) drive shaft to close the defrost air outlet (102) and open the refrigeration air outlet.

10. The refrigerator according to claim 4, characterized in that, The evaporator (103) housing is located above the refrigerator housing.

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