Refrigerator

Abstract

The utility model relates to a refrigerator which comprises a refrigeration assembly, a first storage chamber, a cooling air duct, an air return duct and an air door, the refrigeration assembly is configured to cool air, the first storage chamber is used for storing articles, and the cooling air duct is communicated with fluid of the refrigeration assembly. Cooling air from the refrigeration assembly enters the cooling air duct and then exchanges heat with objects located in the first storage chamber, the air return duct is arranged between the cooling air duct and the refrigeration assembly and is configured to send air in the cooling air duct back to the refrigeration assembly, and the temperature of return air in the air return duct is smaller than that in the first storage chamber. The air door is arranged on the air return duct in an openable and closable mode, and when the air door is in an open state, pressure difference is formed between the air return duct and the first storage chamber, so that water vapor formed by sublimation of a frost layer in the first storage chamber enters the air return duct; when the air door is in a closed state, the air return duct and the first storage chamber are relatively closed.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration, in particular to a refrigerator. Background Art

[0002] After the direct cooling heat exchange chamber is frequently opened and closed, because there is no cold air circulation system in the chamber, the high temperature and high humidity gas from the outside will exchange heat with its low temperature surface and frost will occur on the low temperature surface. The frost layer covering the heat exchange surface will reduce the cooling efficiency of the chamber.

[0003] Currently, the main method of automatic defrosting in related technologies is to use electric heating coils. However, the temperature of the compartment rises during the heating process, and some of the defrost water often accumulates at the bottom of the compartment, unable to flow into the drain pipe. This causes the meat to refreeze during the next refrigeration cycle, affecting the frozen quality of the meat. Therefore, the defrosting effect of electric heating is not very ideal.

[0004] It should be noted that the information disclosed in the background section of this utility model is intended solely to enhance understanding of the overall background of this utility model and should not be construed as an admission or any form of implication that such information constitutes prior art already known to those skilled in the art. The above statements are intended solely to provide background information related to this application and do not necessarily constitute prior art. Utility Model Content

[0005] The embodiment of the utility model provides a refrigerator, which can effectively improve the defrosting effect of the refrigerator.

[0006] According to one aspect of the present invention, there is provided a refrigerator comprising:

[0007] a refrigeration assembly configured to cool the gas;

[0008] a first storage room, for storing items;

[0009] a cooling air duct in fluid communication with the refrigeration assembly, wherein cooling gas from the refrigeration assembly enters the cooling air duct and exchanges heat with items located in the first storage chamber;

[0010] a return air duct, disposed between the cooling air duct and the refrigeration assembly, the return air duct being configured to return the gas in the cooling air duct to the refrigeration assembly, wherein the return air temperature in the return air duct is lower than the temperature in the first storage chamber; and

[0011] The damper is arranged on the return air duct in an openable and closable manner. When the damper is in the open state, a pressure difference is formed between the return air duct and the first storage chamber, so that water vapor formed by sublimation of the frost layer in the first storage chamber enters the return air duct; when the damper is in the closed state, the return air duct and the first storage chamber are relatively closed.

[0012] In some embodiments, the refrigerator also includes a second storage chamber for storing items, the cooling air duct includes a freezing section, the cooling gas in the freezing section is used to exchange heat with the items located in the second storage chamber to put the items into a frozen state, and the return air duct is connected to the freezing section.

[0013] In some embodiments, an angle between a flow direction of the air flow in the return air duct and a flow direction of the water vapor in the first storage chamber entering the return air duct is an acute angle.

[0014] In some embodiments, the flow direction of the air flow in the return air duct is perpendicular to the flow direction of the water vapor in the first storage chamber entering the return air duct.

[0015] In some embodiments, the refrigerator further includes a driving device, which is drivingly connected to the damper, and the driving device is configured to drive the damper to move relative to the return air duct so that the damper is opened or closed.

[0016] In some embodiments, the refrigerator further includes a humidity detection device disposed in the first storage chamber, and the humidity detection device is configured to detect the humidity in the first storage chamber.

[0017] In some embodiments, the refrigerator further includes an adjusting device, which is signal-connected to the humidity detecting device and the driving device, and the adjusting device is configured to adjust the driving device to open the damper when the humidity detecting device detects that the humidity in the first storage chamber is greater than 90%.

[0018] In some embodiments, the refrigerator further includes a temperature detection device and an adjustment device, the temperature detection device is configured to detect the temperature of the first storage chamber, the adjustment device is connected to the temperature detection device and the refrigeration component signal, and the adjustment device is configured to adjust the driving device when the temperature detection device detects that the temperature of the first storage chamber is greater than a first preset value, so as to close the damper and start the refrigeration component.

[0019] In some embodiments, the regulating device is further configured to regulate the driving device to open the damper when the temperature of the first storage chamber is less than or equal to a first preset value.

[0020] In some embodiments, the refrigerator further includes a monitoring device configured to monitor a rate of decrease in humidity within the first storage chamber.

[0021] In some embodiments, the refrigerator also includes a fan and a regulating device, the fan is configured to drive the air flow in the return air duct, the regulating device is connected to the monitoring device and the fan signal, and the regulating device is configured to increase the fan speed when the monitoring device detects that the humidity drop rate in the first storage chamber is less than a second preset value.

[0022] In some embodiments, the refrigeration assembly includes a compressor, the regulating device is connected to the compressor signal, and the regulating device is configured to increase the speed of the compressor when the speed of the fan is increased and the humidity drop rate in the first storage chamber is still less than a second preset value.

[0023] In some embodiments, the refrigerator further includes a cold conduction plate, which is disposed between the cooling air duct and the first storage chamber, and the cooling gas and the items exchange heat through the cold conduction plate.

[0024] Based on the above technical solution, the embodiment of the utility model is provided with an openable and closable damper, which can be opened during defrosting, so that the water vapor formed by the sublimation of the frost layer in the first storage chamber enters the return air duct under the action of the pressure difference, thereby reducing the humidity in the first storage chamber, effectively preventing the defrost water from refreezing, and reducing the impact on the freezing quality of meat items. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1 This is a partial structural diagram of an embodiment of a refrigerator provided by the utility model.

[0027] Figure 2 This is a schematic diagram from another angle showing a partial structure of an embodiment of the refrigerator provided by the present invention.

[0028] Figure 3 This is a defrosting principle diagram of a refrigerator according to an embodiment of the present invention.

[0029] Figure 4 This is a defrosting flow chart of an embodiment of a refrigerator provided by the utility model.

[0030] In the picture:

[0031] 1. First storage chamber; 2. Cooling air duct; 3. Air door; 4. Humidity detection device; 5. Cooling plate. DETAILED DESCRIPTION

[0032] The following will be combined with the accompanying drawings of the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the scope of protection of the present invention.

[0034] like Figure 1 and Figure 2 As shown, the refrigerator includes a refrigeration assembly, a first storage chamber 1, a cooling air duct 2, a return air duct, and a cold plate 5. The refrigeration assembly is used to cool the gas, and the first storage chamber 1 is used to store items. The cooling air duct 2 is connected to the pipeline in the refrigeration assembly, and the cold plate 5 is arranged between the cooling air duct 2 and the first storage chamber 1. The cooling gas from the refrigeration assembly enters the cooling air duct 2 and blows toward the cold plate 5. After the cold plate 5 cools down, it exchanges heat with the items in the first storage chamber 1, achieving the effect of cooling the items. After cooling the items, the cooling gas in the cooling air duct 2 enters the return air duct and returns to the refrigeration assembly to be cooled again, thus forming a cycle.

[0035] In order to improve the defrosting effect of the refrigerator, avoid refreezing of meat items, and improve the freezing quality of meat items, the utility model conducts a careful study on the defrosting method of the refrigerator.

[0036] Research has found that after closing the first storage chamber 1, which is used to store items, and cooling the items within it, the humidity in the first storage chamber 1 will initially rise and then fall due to the different thermal properties of water vapor and air. The initial rise occurs because the air temperature in the first storage chamber 1 drops faster than the water vapor temperature. With the water vapor content remaining essentially unchanged, the saturated vapor pressure of the gas decreases rapidly, leading to a gradual increase in humidity. However, when the water vapor temperature drops below its desublimation point, it freezes into frost, covering the cooling plate 5 of the first storage chamber 1 and the surface of the frozen items. At this point, the humidity within the first storage chamber 1 decreases.

[0037] When the items are completely frozen and the refrigerator enters shutdown mode, the temperature of the first storage chamber 1 begins to rise. At this time, the first storage chamber 1 is in a low-temperature, low-humidity environment. Due to the different thermal properties (such as specific heat capacity, thermal conductivity, thermal diffusivity, etc.) between the cold plate 5 and the items in the first storage chamber 1, the frost layer on the cold plate 5 and the frost layer condensed on the surface of the items in the first storage chamber 1 rise in temperature and sublime at different rates.

[0038] Specifically, the sublimation and temperature recovery rate of the frost layer on the surface of the cold guide plate 5 is much higher than the temperature recovery and sublimation rate of the frost layer on the surface of the frozen object. Figure 3 As shown, over the same period of time, the temperature of the frost layer covering the cold plate 5 increases from T1 to T4, the temperature of the surface of the frozen item increases from T2 to T3, the water vapor pressure near the cold plate 5 rises from P4 to P1, and the water vapor pressure near the item rises from P3 to P2. Therefore, the temperature and humidity near the cold plate 5 are higher than those near the frozen item, forming a stable temperature and vapor pressure difference. Simultaneously, under the influence of this temperature and pressure difference, the water vapor originally located near the cold plate 5 will diffuse or mix with the air near the item, and may even re-frost the item. This will cause the humidity in the first storage chamber 1 to continue to increase.

[0039] To this end, in the embodiment provided by the present invention, the refrigerator also includes an air damper 3, which is arranged on the return air duct. The return air flows in the return air duct, so that a negative pressure is formed in the return air duct. After the air damper 3 is opened, the water vapor formed by the sublimation of the frost layer in the first storage chamber 1 enters the return air duct under the action of the negative pressure, thereby achieving a dehumidification effect, while the return air in the return air duct will not enter the first storage chamber 1, thereby achieving the effect of defrosting and dehumidification, and will not cause the items to refrozen, thereby avoiding affecting the freezing quality of meat items and improving the defrosting effect.

[0040] like Figure 1 and Figure 2 As shown, in some embodiments of the refrigerator provided by the present invention, the refrigerator includes a refrigeration component, a first storage chamber 1, a cooling air duct 2, a return air duct and an air damper 3. The refrigeration component is configured to cool the gas. The first storage chamber 1 is used to store items. The cooling air duct 2 is fluidly connected to the refrigeration component. The cooled gas from the refrigeration component enters the cooling air duct 2 and exchanges heat with the items located in the first storage chamber 1. The return air duct is arranged between the cooling air duct 2 and the refrigeration component. The return air duct is configured to return the gas in the cooling air duct 2 to the refrigeration component. The return air temperature in the return air duct is lower than the temperature in the first storage chamber 1. The air damper 3 can be opened and closed on the return air duct. When the air damper 3 is in an open state, a pressure difference is formed between the return air duct and the first storage chamber 1, so that water vapor formed by sublimation of the frost layer in the first storage chamber 1 enters the return air duct; when the air damper 3 is in a closed state, the return air duct and the first storage chamber 1 are relatively closed.

[0041] By setting an openable and closable damper 3, the damper 3 can be opened during defrosting, so that the water vapor formed by the sublimation of the frost layer in the first storage chamber 1 enters the return air duct under the action of the pressure difference, thereby reducing the humidity in the first storage chamber 1, effectively preventing the defrost water from refreezing, and reducing the impact on the freezing quality of meat products.

[0042] In an embodiment of the present invention, the refrigeration component may include a compressor, a condenser, a throttling element and an evaporator. The gas can be cooled by the evaporator. The low-temperature gas enters the cooling air duct 2 to cool the cold guide plate 5. After the cold guide plate 5 is cooled, the items in the first storage chamber 1 are cooled. Then the gas is sent back to the refrigeration component through the return air duct and cooled again, and the cycle is repeated.

[0043] In some embodiments, the refrigerator also includes a second storage chamber for storing items, the cooling air duct 2 includes a freezing section, the cooling gas in the freezing section is used to exchange heat with the items located in the second storage chamber to put the items into a frozen state, and the return air duct is connected to the freezing section.

[0044] By setting up a freezing section and connecting the return air duct to the freezing section, the gas after freezing the items can enter the return air duct. The gas temperature is close to the freezing temperature and the humidity is low, which has a better dehumidification effect on the first storage chamber 1.

[0045] In some embodiments, the angle between the flow direction of the air flow in the return air duct and the flow direction of the water vapor in the first storage chamber 1 entering the return air duct is an acute angle.

[0046] By constructing the return air duct so that the angle between the air flow direction in the return air duct and the flow direction of water vapor in the first storage chamber 1 entering the return air duct is an acute angle, the return air can be effectively prevented from entering the first storage chamber 1 and affecting the storage quality of meat items.

[0047] In some embodiments, the flow direction of the air flow in the return air duct is perpendicular to the flow direction of the water vapor in the first storage chamber 1 entering the return air duct.

[0048] By constructing the return air duct so that the airflow direction in the return air duct is perpendicular to the flow direction of water vapor in the first storage chamber 1 entering the return air duct, the effect of preventing return air from entering the first storage chamber 1 can be further improved, thereby ensuring the storage quality of meat items.

[0049] In some embodiments, the refrigerator further includes a driving device, which is drivingly connected to the damper 3 , and the driving device is configured to drive the damper 3 to move relative to the return air duct so that the damper 3 is opened or closed.

[0050] By providing a driving device, the damper 3 can be driven to automatically open or close, thereby realizing automatic control of the damper 3 .

[0051] In some embodiments, the driving device may be configured to drive the damper 3 to rotate relative to the return air duct, so as to open or close the damper 3 by rotation.

[0052] In other embodiments, the driving device may be configured to drive the damper 3 to translate relative to the return air duct, so as to open or close the damper 3 by moving it up and down or left and right.

[0053] The driving device can be an oil cylinder, an air cylinder or an electric motor.

[0054] By providing a driving device, the regulating device can realize the opening and closing of the damper 3 by adjusting the driving device.

[0055] In some embodiments, the refrigerator further includes a humidity detection device 4 disposed in the first storage chamber 1 , and the humidity detection device 4 is configured to detect the humidity in the first storage chamber 1 .

[0056] By providing the humidity detection device 4 , the humidity in the first storage chamber 1 can be detected in real time, so that the opening and closing of the damper 3 can be adjusted according to the humidity in the first storage chamber 1 .

[0057] In some embodiments, the refrigerator further includes an adjusting device, which is signal-connected to the humidity detection device 4 and the driving device, and the adjusting device is configured to adjust the driving device to open the damper 3 when the humidity detection device 4 detects that the humidity in the first storage chamber 1 is greater than 90%.

[0058] In some embodiments, the refrigerator further includes a temperature detection device and an adjustment device, the temperature detection device is configured to detect the temperature of the first storage chamber 1, the adjustment device is connected to the temperature detection device and the refrigeration component signal, and the adjustment device is configured to adjust the driving device when the temperature detection device detects that the temperature of the first storage chamber 1 is greater than a first preset value, so as to close the damper 3 and start the refrigeration component.

[0059] By providing a temperature detection device, the temperature in the first storage chamber 1 can be detected in real time to prevent the temperature in the first storage chamber 1 from rising.

[0060] When the temperature detecting device detects that the temperature of the first storage chamber 1 is greater than a first preset value, the regulating device adjusts the driving device to close the damper 3, stop dehumidification, and start the refrigeration component to start cooling the first storage chamber 1.

[0061] The temperature detection device can be arranged at the same position as the humidity detection device 4, such as at a position adjacent to the damper 3, so as to improve the detection accuracy of temperature and humidity and facilitate the control of temperature and humidity.

[0062] In some embodiments, the regulating device is further configured to regulate the driving device when the temperature of the first storage chamber 1 is less than or equal to a first preset value, so as to open the damper 3 .

[0063] After cooling, when the temperature of the first storage chamber 1 is less than or equal to the first preset value and the humidity in the first storage chamber 1 still does not meet the preset requirement, the regulating device regulates the driving device to open the damper 3 to continue dehumidification.

[0064] In some embodiments, the refrigerator further comprises a monitoring device configured to monitor a rate of decrease of humidity in the first storage chamber 1 .

[0065] By setting up a monitoring device, the humidity drop rate in the first storage chamber 1 can be monitored in real time, so as to facilitate taking measures to increase the humidity drop rate when the humidity drop rate in the first storage chamber 1 cannot meet the preset requirements.

[0066] In some embodiments, the refrigerator also includes a fan and a regulating device, the fan is configured to drive the air flow in the return air duct, the regulating device is connected to the monitoring device and the fan signal, and the regulating device is configured to increase the fan speed when the monitoring device detects that the humidity drop rate in the first storage chamber 1 is less than a second preset value.

[0067] By increasing the rotation speed of the fan, the flow speed of the air flow in the return air duct can be increased, thereby enhancing the dehumidification effect and increasing the humidity reduction speed in the first storage chamber 1.

[0068] In some embodiments, the refrigeration assembly includes a compressor, the regulating device is connected to the compressor signal, and the regulating device is configured to increase the speed of the compressor when the fan speed is increased and the humidity drop rate in the first storage chamber 1 is still less than a second preset value.

[0069] By increasing the speed of the compressor in the refrigeration assembly, the refrigeration effect can be improved, the temperature of the cooling gas in the cooling air duct can be reduced, and the gas temperature in the return air duct can be reduced, thereby increasing the pressure difference between the return air duct and the first storage chamber 1 and improving the dehumidification effect.

[0070] Based on the refrigerator in the above embodiment, the defrosting step includes:

[0071] The damper 3 is opened to allow the water vapor formed by the sublimation of the frost layer in the first storage chamber 1 to enter the return air duct, so as to reduce the humidity in the first storage chamber 1 .

[0072] By opening the damper 3, the water vapor formed by the sublimation of the frost layer in the first storage chamber 1 can enter the return air duct under the action of the pressure difference, thereby reducing the humidity in the first storage chamber 1, effectively preventing the defrost water from refreezing, and reducing the impact on the freezing quality of meat products.

[0073] In some embodiments, the defrosting step further comprises:

[0074] A second storage chamber is provided for storing articles, the cooling air duct 2 includes a freezing section, and the cooling gas in the freezing section is used to exchange heat with the articles in the second storage chamber to put the articles into a frozen state; and

[0075] The return air duct is connected to the freezing section so that the cooled gas after heat exchange in the freezing section enters the return air duct to dehumidify the first storage chamber 1.

[0076] By setting up a freezing section and connecting the return air duct to the freezing section, the gas after freezing the items can enter the return air duct. The gas temperature is close to the freezing temperature and the humidity is low, which has a better dehumidification effect on the first storage chamber 1.

[0077] In some embodiments, the defrosting step further comprises:

[0078] detecting the humidity in the first storage chamber 1; and

[0079] When the humidity in the first storage chamber 1 is greater than 90%, the damper 3 is opened.

[0080] In some embodiments, the defrosting step further comprises:

[0081] detecting the temperature of the first storage chamber 1; and

[0082] When the temperature of the first storage chamber 1 is greater than a first preset value, the damper 3 is closed and the refrigeration component is started.

[0083] When the temperature detecting device detects that the temperature of the first storage chamber 1 is greater than a first preset value, the regulating device adjusts the driving device to close the damper 3, stop dehumidification, and start the refrigeration component to start cooling the first storage chamber 1.

[0084] In some embodiments, the defrosting step further comprises:

[0085] After the refrigeration component is started, the temperature of the first storage chamber 1 continues to be detected, and when the temperature of the first storage chamber 1 is less than or equal to a first preset value, the damper 3 is opened.

[0086] In some embodiments, the defrosting step further comprises:

[0087] A fan is provided for driving the air flow in the return air duct;

[0088] monitoring the rate of decrease of humidity in the first storage chamber 1; and

[0089] When the humidity drop rate in the first storage chamber 1 is less than the second preset value, the rotation speed of the fan is increased.

[0090] By increasing the rotation speed of the fan, the flow speed of the air flow in the return air duct can be increased, thereby enhancing the dehumidification effect and increasing the humidity reduction speed in the first storage chamber 1.

[0091] In some embodiments, the refrigeration assembly includes a compressor, and the defrosting step further includes:

[0092] After increasing the rotational speed of the blower, and when the rate of decrease in humidity in the first storage chamber 1 is still less than the second preset value, increase the rotational speed of the compressor.

[0093] By increasing the rotational speed of the compressor in the refrigeration assembly, the refrigeration effect can be improved, the temperature of the cooling gas in the cooling air duct can be reduced, and further the temperature of the gas in the return air duct can be reduced, so that the pressure difference between the return air duct and the first storage chamber 1 is greater and the dehumidification effect is better.

[0094] Such as Figure 4 As shown, during the process of the increase in humidity in the first storage chamber 1, the humidity detection device 4 and the temperature detection device continuously monitor the humidity and temperature of the first storage chamber 1. When it is detected that the humidity RH in the first storage chamber 1 is greater than 90%, the air door 3 is opened. Due to the characteristics of the low temperature and low humidity of the refrigerated return air and the flow rate of the refrigerated return air, the partial pressure of water vapor thereof is less than the partial pressure of water vapor in the first storage chamber 1. Therefore, under the action of the humidity difference, the water vapor in the first storage chamber 1 diffuses into the refrigerated return air duct, thereby reducing the humidity of the first storage chamber 1. The humidity detection device 4 and the temperature detection device continuously monitor the rate of decrease in humidity V of the first storage chamber 1. If V < V1, increase the rotational speed of the blower of the refrigerated return air; if the rate of decrease in humidity V in the first storage chamber 1 is still less than the second preset value V1, increase the rotational speed of the compressor until V > V1. Moreover, during the dehumidification process, if the temperature T of the first storage chamber 1 is greater than the first preset value T1, close the air door 3 and stop defrosting until the temperature in the first storage chamber 1 drops back to the first preset value T1 again, and then continue dehumidifying to keep the humidity of the first storage chamber 1 within the range of 50% - 90%.

[0095] The refrigerator provided by the present utility model can effectively improve the defrosting effect, directly sublime the frost layer into water vapor, and make the water vapor enter the return air duct under the action of the pressure difference to achieve the purpose of dehumidification, and effectively prevent the refreezing of meat products, prevent the loss of juice of meat products, and ensure the freezing quality of meat products.

[0096] The descriptions of the above embodiments tend to emphasize the differences between the embodiments. Their similarities or similarities can be referred to each other. For the sake of brevity, they will not be elaborated herein.

[0097] The regulating device can be a general-purpose processor, a programmable logic controller (PLC), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any appropriate combination thereof for performing the functions described in the present invention.

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that without departing from the principles of the present invention, the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents. These modifications and equivalent replacements should all be included in the scope of the technical solutions claimed for protection in the present invention.

Claims

1. A refrigerator, characterized in that: include: a refrigeration assembly configured to cool the gas; A first storage chamber (1), used for storing items; a cooling air duct (2) in fluid communication with the refrigeration component, wherein cooling gas from the refrigeration component enters the cooling air duct (2) and exchanges heat with the items in the first storage chamber (1); a return air duct, arranged between the cooling air duct (2) and the refrigeration component, the return air duct being configured to return the gas in the cooling air duct (2) to the refrigeration component, the return air temperature in the return air duct being lower than the temperature in the first storage chamber (1); and The damper (3) is openably and closably arranged on the return air duct. When the damper (3) is in an open state, a pressure difference is formed between the return air duct and the first storage chamber (1), so that water vapor formed by sublimation of the frost layer in the first storage chamber (1) enters the return air duct; when the damper (3) is in a closed state, the return air duct and the first storage chamber (1) are relatively closed.

2. The refrigerator according to claim 1, characterized in that: It also includes a second storage chamber for storing items, the cooling air duct (2) includes a freezing section, the cooling gas in the freezing section is used to exchange heat with the items located in the second storage chamber so that the items enter a frozen state, and the return air duct is connected to the freezing section.

3. The refrigerator according to claim 1, characterized in that: The angle between the flow direction of the air flow in the return air duct and the flow direction of the water vapor in the first storage chamber (1) entering the return air duct is an acute angle.

4. The refrigerator according to claim 1, characterized in that: The flow direction of the air flow in the return air duct is perpendicular to the flow direction of the water vapor in the first storage chamber (1) entering the return air duct.

5. The refrigerator according to claim 1, characterized in that: It also comprises a driving device, which is drivingly connected to the damper (3), and is configured to drive the damper (3) to move relative to the return air duct so as to open or close the damper (3).

6. The refrigerator according to claim 5, characterized in that: It also comprises a humidity detection device (4) arranged in the first storage chamber (1), wherein the humidity detection device (4) is configured to detect the humidity in the first storage chamber (1).

7. The refrigerator according to claim 6, characterized in that: It also includes an adjusting device, which is signal-connected to the humidity detection device (4) and the driving device, and is configured to adjust the driving device when the humidity detection device (4) detects that the humidity in the first storage chamber (1) is greater than 90%, so as to open the damper (3).

8. The refrigerator according to claim 5, characterized in that: The invention also comprises a temperature detection device and an adjustment device, wherein the temperature detection device is configured to detect the temperature of the first storage chamber (1), the adjustment device is connected to the temperature detection device and the refrigeration component by signal, and the adjustment device is configured to adjust the driving device when the temperature detection device detects that the temperature of the first storage chamber (1) is greater than a first preset value, so as to close the damper (3) and start the refrigeration component.

9. The refrigerator according to claim 8, characterized in that: The regulating device is also configured to regulate the driving device when the temperature of the first storage chamber (1) is less than or equal to a first preset value, so as to open the damper (3).

10. The refrigerator according to claim 1, characterized in that: It also comprises a monitoring device, which is configured to monitor the humidity drop rate in the first storage chamber (1).

11. The refrigerator according to claim 10, characterized in that: It also includes a fan and a regulating device, wherein the fan is configured to drive the air flow in the return air duct, the regulating device is connected to the monitoring device and the fan signal, and the regulating device is configured to increase the speed of the fan when the monitoring device detects that the humidity drop rate in the first storage chamber (1) is less than a first preset value.

12. The refrigerator according to claim 11, characterized in that: The refrigeration assembly comprises a compressor, the regulating device is connected to the compressor signal, and the regulating device is configured to increase the speed of the compressor when the speed of the fan is increased and the humidity drop rate in the first storage chamber (1) is still less than a second preset value.

13. The refrigerator according to any one of claims 1 to 12, characterized in that: It also comprises a cooling plate (5), wherein the cooling plate (5) is arranged between the cooling air duct (2) and the first storage chamber (1), and the cooling gas and the object exchange heat through the cooling plate (5).

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