CN116007269B - Refrigeration and freezing equipment - Google Patents

Abstract

The present invention relates to a refrigeration and freezing device, comprising: a box body, a storage compartment is defined therein, the storage compartment has an air supply port and a first air return port and a second air return port, the second air return port is adjacent to the bottom of the storage compartment; a storage device, which is arranged in the storage compartment and has a moisture permeable membrane for allowing moisture therein to permeate outwards, the moisture permeable membrane being located on an air flow path between the air supply port and the first air return port; and a switching device, which is configured to open the first air return port when the storage device is in a moisturizing mode and the humidity in the storage device is higher than a preset maximum humidity threshold so that the air flow flows out of the storage compartment along the air flow path between the air supply port and the first air return port, and to open the second air return port when the storage device is in a moisturizing mode and the humidity in the storage device is lower than or equal to the preset maximum humidity threshold so that the air flow flows out of the storage compartment along the air flow path between the air supply port and the second air return port.

Description

Refrigeration and freezing equipment

Technical Field

The invention relates to refrigeration and freezing technology, in particular to a refrigeration and freezing device.

Background Art

As refrigerators and other refrigeration and freezing devices have become more and more integrated into people's daily lives, users have higher and higher requirements for the quality of food preservation in such refrigeration and freezing devices. For example, users hope to set up an area in the refrigeration and freezing device specifically for storing fruits and vegetables with high water content, so as to improve the preservation effect of fruits and vegetables and prevent the loss of water in fruits and vegetables. For another example, users also hope to set up an area in the refrigeration and freezing device specifically for storing treasures, tea and other dry goods, so as to prevent the dry goods from getting damp and deteriorating. For another example, in order to avoid wasting storage space, users also hope that a certain area in the refrigeration and freezing device can be switched between a moisturizing mode for storing fruits and vegetables and a drying mode for storing dry goods, so as to flexibly select its functional mode, thereby selectively storing food with different humidity requirements.

In order to meet the above-mentioned needs of users, a moisturizing drawer or a dry-wet adjustable drawer is provided in the prior art in the refrigeration and freezing device. In order to prevent the humidity in the drawer from being too high in the moisturizing mode, a moisture permeable membrane is also provided on the drawer to allow the moisture in the drawer to penetrate outward. However, the drawer is usually placed at the bottom of the refrigerator compartment, the moisture permeable membrane is provided at the top of the drawer, and a shelf is provided above the drawer, so that the space above the moisture permeable membrane is very limited, resulting in a slow airflow speed in the space where the moisture permeable membrane is located. When the humidity inside the drawer is high, the outside of the moisture permeable membrane will also have a high humidity due to the slow airflow speed, causing the humidity inside and outside the moisture permeable membrane to reach a balance, so that the moisture permeable membrane loses its moisture permeability, resulting in excessive humidity inside the drawer, which affects the freshness preservation effect of fruits, vegetables and other ingredients, and may even produce condensation.

Summary of the invention

An object of the present invention is to overcome at least one defect of the prior art and to provide a refrigeration and freezing device that can effectively prevent excessive humidity in a storage device to improve the preservation effect.

Another object of the present invention is to avoid a significant impact on the refrigeration effect of the storage compartment.

In order to achieve the above object, the present invention provides a refrigeration and freezing device, comprising:

a box body, wherein a storage compartment for storing articles is defined therein, the storage compartment having an air supply port for air flow into the storage compartment and a first air return port and a second air return port for air flow out of the storage compartment, the second air return port being adjacent to a bottom of the storage compartment;

a storage device, disposed in the storage compartment and having a moisture-permeable membrane for allowing moisture therein to permeate outward, the moisture-permeable membrane being located on an airflow path between the air supply port and the first air return port; and

A switching device is configured to open the first return air outlet when the storage device is in a moisturizing mode and the humidity in the storage device is higher than a preset maximum humidity threshold so that the airflow flows out of the storage compartment along an airflow path between the air supply outlet and the first return air outlet, and to open the second return air outlet when the storage device is in a moisturizing mode and the humidity in the storage device is lower than or equal to the preset maximum humidity threshold so that the airflow flows out of the storage compartment along an airflow path between the air supply outlet and the second return air outlet.

Optionally, the first return air vent and the second return air vent are located on the same side of the storage compartment; and

The switching device includes a shielding plate movable along a line connecting the first return air outlet and the second return air outlet so as to selectively shield the first return air outlet or the second return air outlet.

Optionally, the switching device further includes a driving mechanism for driving the shielding plate to move along a direction of a line connecting the first return air outlet and the second return air outlet.

Optionally, the first return air outlet and the second return air outlet are both located at the rear side of the storage compartment; and

The first air return outlet is located above the second air return outlet.

Optionally, the moisture permeable membrane is located on the top of the storage device; and

The height of the first air return port is equivalent to the height of the moisture permeable membrane.

Optionally, the air flow path between the air supply port and the first return air port includes a first return air sub-path formed above the storage device, and the first return air sub-path is directly connected to the first return air port.

Optionally, the air flow path between the air supply port and the second air return port includes a second air return sub-path formed below the storage device, and the second air return sub-path is directly connected to the second air return port;

The first return air sub-path and the second return air sub-path are independent of each other.

Optionally, the refrigeration and freezing device further comprises:

A shelf is arranged in the storage compartment; wherein

The storage device is located below the shelf, and the first return air sub-path is formed between the shelf and the storage device.

Optionally, the storage device has an air inlet for allowing air to flow into it and an air outlet for allowing air to flow out of it; and

The refrigeration and freezing device also includes an evaporator for providing a cooling airflow, an air inlet damper arranged on the airflow path between the air inlet and the evaporator, and an air outlet damper arranged at the air outlet. When the storage device is in a moisturizing mode, the air inlet damper and the air outlet damper are both in a closed state.

Optionally, the second air return port is arranged adjacent to the air outlet; and

When the storage device is in a drying mode, the air inlet damper and the air outlet damper are both controlled to open, and the switching device is configured to controllably open the second return air vent and close the first return air vent when the storage device is in a drying mode.

The refrigeration and freezing device of the present invention includes a box body defining a storage compartment and a storage device arranged in the storage compartment. In particular, in addition to the air supply port and the second air return port adjacent to the bottom of the storage compartment, a first air return port is additionally provided, and the moisture permeable membrane of the storage device is located on the air flow path between the air supply port and the first air return port. In addition, the refrigeration and freezing device is also provided with a switching device for selectively opening the first air return port or the second air return port. When the storage device is in a moisturizing mode and the humidity therein exceeds a preset maximum humidity threshold, the humidity in the storage device is too high, affecting the preservation effect of fruits and vegetables, and the moisture in the storage device will leak out through the moisture permeable membrane. At this time, the switching device opens the first return air outlet, and the air flow in the storage room can flow out of the storage room along the air flow path between the air supply outlet and the first return air outlet, thereby promoting the air flow in the external space where the moisture permeable membrane is located, and timely updating the air outside the moisture permeable membrane, thereby preventing the air humidity outside the moisture permeable membrane from being too high and affecting the moisture permeability effect of the moisture permeable membrane, thereby effectively preventing the humidity in the storage device from being too high and improving its preservation effect.

When the storage device is in the moisturizing mode and the humidity therein is lower than or equal to the preset maximum humidity threshold, it means that the humidity in the storage device is appropriate and the moisture therein will not leak out through the moisture permeable membrane. At this time, the switching device opens the second return air outlet, and the airflow in the storage room can flow out of the storage room along the airflow path between the air supply outlet and the second return air outlet. Since the second return air outlet is adjacent to the bottom of the storage room, the airflow entering the storage room from the air supply outlet can flow through most areas of the storage room before flowing out of the storage room, ensuring a more balanced cooling effect in the storage room. In other words, when the humidity in the storage device drops, the switching device opens the second return air outlet in time to avoid a significant impact on the cooling effect of the storage room.

Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

FIG1 is a schematic structural diagram of a refrigeration and freezing device according to an embodiment of the present invention;

FIG2 is a schematic enlarged view of portion A in FIG1 ;

3 is a schematic structural diagram of a refrigerator-freezer in a state where a first air return port is opened according to an embodiment of the present invention;

Fig. 4 is a schematic structural diagram of a refrigeration and freezing device according to an embodiment of the present invention in a state where the second air return port is opened.

DETAILED DESCRIPTION

When faced with the technical problems raised in the background technology section of the present invention, the technical means generally adopted by those skilled in the art is to increase the height of the shelf to expand the gap between the shelf and the breathable membrane. However, the space between the shelf and the breathable membrane cannot store items, resulting in a huge waste of space. Another technical means generally adopted by those skilled in the art is to use a driving device to speed up the airflow in the space where the breathable membrane is located, such as adding a small fan. However, this will make the air duct structure very complicated and the fan arrangement difficult.

To this end, the present invention provides a refrigeration and freezing device, FIG1 is a schematic structural diagram of a refrigeration and freezing device according to an embodiment of the present invention, and FIG2 is a schematic enlarged diagram of part A in FIG1. Referring to FIG1 and FIG2, the refrigeration and freezing device 1 of the present invention includes a box body 10, a storage device 20 and a switching device 30.

A storage compartment 11 for storing articles is defined in the box body 10, and the storage compartment 11 has an air supply port 111 for air flow into the storage compartment 11, and a first air return port 112 and a second air return port 113 for air flow out of the storage compartment 11, and the second air return port 113 is adjacent to the bottom of the storage compartment 11. Further, the storage compartment 11 has a front opening located at the front side thereof, and the refrigerator-freezer 1 further includes a door body 60, which is connected to the front side of the box body 10 to selectively open or close the front opening of the storage compartment 11.

The storage device 20 is disposed in the storage compartment 11 and has a moisture permeable membrane 21 for allowing moisture therein to permeate outward, and the moisture permeable membrane 21 is located on the air flow path between the air supply port 111 and the first air return port 112. Specifically, the storage compartment 11 is preferably a refrigerated compartment with a refrigerated storage environment, and may also be other compartments capable of preserving freshness, such as a variable temperature chamber.

The switching device 30 is configured to open the first return air vent 112 when the storage device 20 is in the moisturizing mode and the humidity inside the storage device 20 is higher than a preset maximum humidity threshold so that the airflow flows out of the storage compartment 11 along the air flow path between the air supply vent 111 and the first return air vent 112, and to open the second return air vent 113 when the storage device 20 is in the moisturizing mode and the humidity inside the storage device 20 is lower than or equal to the preset maximum humidity threshold so that the airflow flows out of the storage compartment 11 along the air flow path between the air supply vent 111 and the second return air vent 113.

The refrigeration and freezing device 1 of the present invention comprises a box body 10 defining a storage compartment 11 and a storage device 20 disposed in the storage compartment 11. In particular, in addition to the air supply port 111 and the second air return port 113 adjacent to the bottom of the storage compartment 11, the storage compartment 11 is additionally provided with a first air return port 112, and the moisture permeable membrane 21 of the storage device 20 is located on the air flow path between the air supply port 111 and the first air return port 112. In addition, the refrigeration and freezing device 1 is further provided with a switching device 30 for selectively opening the first air return port 112 or the second air return port 113. FIG. 3 is a schematic structural diagram of a refrigeration and freezing device according to an embodiment of the present invention in a state where the first air return port is opened, and the arrows in the figure indicate the approximate flow direction of the air flow. When the storage device 20 is in a moisturizing mode and the humidity therein exceeds a preset maximum humidity threshold, the humidity in the storage device 20 is too high, affecting the preservation effect of fruits and vegetables, and the moisture in the storage device 20 will be transmitted outward through the moisture permeable membrane 21. At this time, the switching device 30 opens the first return air outlet 112, and the air flow in the storage compartment 11 can flow out of the storage compartment 11 along the air flow path between the air supply outlet 111 and the first return air outlet 112, thereby promoting the air flow in the external space where the moisture permeable membrane 21 is located, timely updating the air outside the moisture permeable membrane 21, reducing the air humidity, and avoiding the air humidity outside the moisture permeable membrane 21 from being too high to affect the moisture permeability effect of the moisture permeable membrane 21, thereby effectively avoiding the humidity in the storage device 20 from being too high and improving its preservation effect.

That is, the present invention adds a first return air port 112 to the storage compartment 11, and changes the return air path of the storage compartment 11 to cause the airflow in the storage compartment 11 to selectively flow through the external space where the moisture permeable membrane 21 is located, thereby preventing the humidity in the external space where the moisture permeable membrane 21 is located from being too high and affecting the moisture permeability of the moisture permeable membrane 21. In other words, the present invention utilizes the flow of the return airflow of the storage compartment 11 itself, and does not need to add a new airflow driving mechanism. The design concept is very novel and does not bring about design difficulties in the air duct structure.

FIG4 is a schematic structural diagram of a refrigeration and freezing device in a state of opening the second air return port according to an embodiment of the present invention, and the arrows in the figure indicate the approximate direction of the airflow. When the storage device 20 is in a moisturizing mode and the humidity therein is lower than or equal to the preset maximum humidity threshold, it indicates that the humidity in the storage device 20 is appropriate and the moisture therein will not leak out through the moisture permeable membrane 21. At this time, the switching device 30 opens the second air return port 113, and the airflow in the storage compartment 11 can flow out of the storage compartment 11 along the airflow path between the air supply port 111 and the second air return port 113. Since the second air return port 113 is adjacent to the bottom of the storage compartment 11, the airflow entering the storage compartment 11 from the air supply port 111 can flow through most of the area in the storage compartment 11 before flowing out of the storage compartment 11, thereby ensuring a relatively balanced refrigeration effect in the storage compartment 11. That is to say, when the humidity in the storage device 20 drops, the switching device 30 opens the second air return port 113 in time, which can avoid a significant impact on the cooling effect of the storage compartment 11.

Furthermore, the refrigeration and freezing device 1 of the present invention also includes an evaporator 50 for providing a cooling airflow. The evaporator 50 is arranged in an evaporator chamber 12 located at the rear side of the storage compartment 11. The top of the evaporator chamber 12 is connected to the storage compartment 11 through an air supply duct 13 to supply a cooling airflow to the storage compartment 11; the bottom of the evaporator chamber 12 is connected to the storage compartment 11 through a return air duct 14 to allow the return airflow in the storage compartment 11 to return to the evaporator chamber 12.

Furthermore, the first return air port 112 is in communication with the return air duct 14 through the connecting channel 15 , so as to allow the return air flowing out through the first return air port 112 to return to the evaporator 50 through the return air duct 14 .

In some embodiments, the first return air vent 112 and the second return air vent 113 are located on the same side of the storage compartment 11. The switching device 30 includes a shielding plate 31 movable along a line between the first return air vent 112 and the second return air vent 113 to selectively shield the first return air vent 112 or the second return air vent 113.

Specifically, when the storage device 20 is in the moisturizing mode and the humidity in the storage device 20 is higher than the preset maximum humidity threshold, the shielding plate 31 can be in a state of shielding the second return air outlet 113 and opening the first return air outlet 112; when the storage device 20 is in the moisturizing mode and the humidity in the storage device 20 is lower than or equal to the preset maximum humidity threshold, the shielding plate 31 can be in a state of opening the second return air outlet 113 and shielding the first return air outlet 112. In other words, shielding the second return air outlet 113 and opening the first return air outlet 112, as well as opening the second return air outlet 113 and shielding the first return air outlet 112 can be achieved through a translation action of a shielding plate 31, the structure and control logic are very simple, and the action control is more precise, and it is not easy to have a large error.

In some embodiments, the switching device 30 further includes a driving mechanism 32 for driving the shielding plate 31 to move along the line direction between the first return air outlet 112 and the second return air outlet 113. In a specific embodiment, the driving mechanism 32 may include a micro motor, a gear, and a rack provided on the shielding plate 31. In some alternative embodiments, the driving mechanism 32 may also be other mechanisms capable of stably driving the shielding plate 31 to translate. Since the specific structure of such a mechanism is relatively easy to obtain for those skilled in the art, it will not be described in detail here.

Since the cooling chamber for accommodating the evaporator of the refrigeration and freezing device 1 is usually located at the rear of the storage compartment 11, in some embodiments, the first return air outlet 112 and the second return air outlet 113 are both located at the rear side of the storage compartment 11 to facilitate the return air in the storage compartment 11 to return to the evaporator, thereby shortening the return air path and simplifying the structure of the return air duct.

Furthermore, in order to prevent the moisture permeable membrane 21 from being blocked by the items stored in the storage device 20, the moisture permeable membrane 21 is generally arranged at the upper part or the bottom of the storage device 20, and therefore, the moisture permeable membrane 21 has a certain height relative to the bottom of the storage compartment 11. To this end, the present invention arranges the first return air outlet 112 above the second return air outlet 113. Specifically, the first return air outlet 112 may be located obliquely above the second return air outlet 113, or may be located directly above the second return air outlet 113. In order to facilitate the movement of the shielding plate 31 and the arrangement of the driving mechanism 32, the first return air outlet 112 is preferably located directly above the second return air outlet 113, that is, the connecting line direction of the first return air outlet 112 and the second return air outlet 113 extends in the vertical direction, and the shielding plate 31 is translated in the vertical direction under the drive of the driving mechanism 32.

In some embodiments, the moisture permeable membrane 21 is preferably disposed at the top of the storage device 20. The height of the first return air port 112 is substantially equal to the height of the moisture permeable membrane 21. Thus, when the first return air port 112 is opened, it can be ensured that the return air flow flowing toward the first return air port 112 due to the negative pressure formed at the first return air port 112 will inevitably flow through the space outside the moisture permeable membrane 21, thereby ensuring that the high-humidity air outside the moisture permeable membrane 21 is effectively replaced. It should be noted that the space outside the moisture permeable membrane 21 in the present invention refers to the space outside the moisture permeable membrane 21 away from the storage device 20.

Furthermore, the airflow path between the air supply port 111 and the first air return port 112 includes a first air return sub-path 114 formed above the storage device 20, and the first air return sub-path 114 is directly connected to the first air return port 112. Specifically, since the moisture permeable membrane 21 is disposed on the top of the storage device 20, the first air return sub-path 114 includes the space outside the moisture permeable membrane 21, and when the airflow flows through the first air return sub-path 114, the airflow speed of the space outside the moisture permeable membrane 21 is accelerated, thereby realizing continuous replacement of the air in the space outside the moisture permeable membrane 21.

In some embodiments, the air flow path between the air supply port 111 and the second air return port 113 includes a second air return sub-path 115 formed below the storage device 20, and the second air return sub-path 115 is directly connected to the second air return port 113. The first air return sub-path 114 and the second air return sub-path 115 are independent of each other. Therefore, when the second air return port 113 is opened, almost all of the return air flows out of the storage compartment 11 through the second air return sub-path 115. Since the second air return port 113 is adjacent to the bottom of the storage compartment 11 and the second air return sub-path 115 is located at the bottom of the storage device 20, the air flow at the bottom of the storage device 20 can also be effectively replaced, ensuring a better cooling effect in the storage device 20.

In some embodiments, the refrigerator-freezer 1 further includes a shelf 40, which is disposed in the storage compartment 11. The storage device 20 is located below the shelf 40, and a first return air sub-path 114 is formed between the shelf 40 and the storage device 20. The arrangement of the shelf 40 provides a platform for the user to place items, and the first return air sub-path 114 is located below the shelf 40 and is blocked by the shelf 40, so as not to affect the appearance of the entire storage compartment 11.

In some embodiments, the storage device 20 has an air inlet 22 for allowing air to flow into it and an air outlet 23 for allowing air to flow out of it. In the prior art, a damper is usually provided at the air inlet 22 to selectively allow the cooling air generated by the evaporator to flow into the storage device 20, however, the air outlet 23 is open and directly exposed to the storage compartment, and there is a situation where the return air in the storage compartment 11 or the return air duct enters the storage device 20 through the air outlet 23, affecting the temperature and humidity in the storage device 20.

To this end, the refrigeration and freezing device 1 of the present invention further includes an air inlet damper 24 disposed on the air flow path between the air inlet 22 and the evaporator 50 and an air outlet damper 25 disposed at the air outlet 23. When the storage device 20 is in the moisturizing mode, the air inlet damper 24 and the air outlet damper 25 are both in a closed state. Thus, a closed space can be formed in the storage device 20, and the fruits and vegetables and other items with a large water content stored in the storage device 20 evaporate a large amount of water, so that a high humidity space with a high humidity is formed in the storage device 20, which is conducive to the preservation of fruits and vegetables and other items. When the humidity in the storage device 20 is too high, for example, when it exceeds the preset maximum humidity threshold, the excessive moisture will be transmitted through the moisture permeable membrane 21, and the transmitted moisture will flow out of the storage compartment 11 along with the return air flow in the storage compartment 11, maintaining the humidity difference between the inside and outside of the moisture permeable membrane 21, and ensuring that the excessive moisture in the storage device 20 is smoothly transmitted.

Furthermore, due to the presence of the air outlet door 25 , regardless of whether negative pressure is formed in the storage device 20 , the airflow in the storage compartment 11 will not flow into the storage device 20 and affect the humidity in the storage device 20 due to the obstruction of the air outlet door 25 .

In some embodiments, the second air return port 113 is disposed adjacent to the air outlet 23 , so that the airflow out of the storage device 20 returns to the evaporator 50 through the second air return port 113 .

Furthermore, when the storage device 20 is in the drying mode, the air inlet door 24 and the air outlet door 25 are both controlled to open, and the switching device 30 is configured to controllably open the second return air port 113 and close the first return air port 112 when the storage device 20 is in the drying mode. That is to say, when the storage device 20 is in the drying mode, the storage compartment 20 returns air through the second return air port 113. On the one hand, the airflow entering the storage compartment 11 from the air supply port 111 can flow through most of the area in the storage compartment 11 before flowing out of the storage compartment 11, ensuring a relatively balanced cooling effect in the storage compartment 11; on the other hand, it is also convenient for the return air in the storage device 20 flowing out of the air outlet 23 to return to the evaporator 50 through the adjacent second return air port 113, and the airflow flows relatively smoothly.

In some embodiments, the number of the storage devices 20 may be one, two, or more than two. When the number of the storage devices 20 is two, the two storage devices 20 may be arranged side by side in the horizontal direction at the bottom of the storage compartment 11 .

Those skilled in the art should understand that the refrigeration and freezing device 1 of the present invention includes not only refrigerators, but also storage devices with refrigeration, freezing or other storage functions, such as refrigerators, freezers, and the like.

Those skilled in the art should also understand that the terms "upper", "lower", "front", "back", "top", "bottom", etc. used to indicate orientation or positional relationships in the embodiments of the present invention are based on the actual use status of the refrigeration and freezing device 1. These terms are only used to facilitate the description and understanding of the technical solution of the present invention, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived based on the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all these other variations or modifications.

Claims (10)

1. A refrigerated chiller comprising:

the box body is internally provided with a storage compartment for storing articles, the storage compartment is provided with an air supply port for air flow to flow into the storage compartment, and a first air return port and a second air return port for air flow to flow out of the storage compartment, and the second air return port is adjacent to the bottom of the storage compartment;

The storage device is arranged in the storage compartment and is provided with a moisture permeable membrane for the moisture in the storage compartment to permeate outwards, and the moisture permeable membrane is positioned on an airflow flowing path between the air supply port and the first air return port; and

The switching device is configured to open the first air return opening so that air flows out of the storage compartment along an air flow path between the air supply opening and the first air return opening when the storage device is in a moisturizing mode and the humidity in the storage device is higher than a preset maximum humidity threshold value, and open the second air return opening so that air flows out of the storage compartment along an air flow path between the air supply opening and the second air return opening when the storage device is in the moisturizing mode and the humidity in the storage device is lower than or equal to the preset maximum humidity threshold value.

2. The refrigeration and freezer of claim 1, wherein

The first air return opening and the second air return opening are positioned on the same side of the storage compartment; and is also provided with

The switching device comprises a shielding plate which can move along the connecting line direction between the first air return opening and the second air return opening so as to selectively shield the first air return opening or the second air return opening.

3. The refrigeration and freezer of claim 2, wherein

The switching device further comprises a driving mechanism for driving the shielding plate to move along the connecting line direction between the first air return opening and the second air return opening.

4. The refrigeration and freezer of claim 2, wherein

The first air return port and the second air return port are both positioned at the rear side of the storage compartment; and is also provided with

The first air return opening is positioned above the second air return opening.

5. The refrigeration and freezer of claim 4, wherein

The moisture permeable film is positioned at the top of the storage device; and is also provided with

The height of the first air return opening is equal to that of the moisture permeable film.

6. The refrigeration and freezer of claim 5, wherein

The airflow flowing path between the air supply opening and the first air return opening comprises a first air return sub-path formed above the storage device, and the first air return sub-path is directly communicated with the first air return opening.

7. The refrigeration and freezer of claim 6, wherein

The airflow flowing path between the air supply opening and the second air return opening comprises a second air return sub-path formed below the storage device, and the second air return sub-path is directly communicated with the second air return opening;

The first return air sub-path and the second return air sub-path are independent of each other.

8. The refrigeration and freezer of claim 6, further comprising:

The rack is arranged in the storage compartment; wherein the method comprises the steps of

The storage device is located below the rack, and the first return air sub-path is formed between the rack and the storage device.

9. The refrigeration and freezer of claim 1, wherein

The storage device is provided with an air inlet allowing air flow to flow into the storage device and an air outlet allowing the air flow in the storage device to flow out; and is also provided with

The refrigerating and freezing device further comprises an evaporator for providing cooling air flow, an air inlet air door arranged on an air flow path between the air inlet and the evaporator, and an air outlet air door arranged at the air outlet, wherein the storage device is in a moisturizing mode, and the air inlet air door and the air outlet air door are both in a closed state.

10. The refrigeration and freezer of claim 9, wherein

The second air return port is arranged adjacent to the air outlet; and is also provided with

And when the storage device is in a drying mode, the air inlet air door and the air outlet air door are controlled to be opened, and the switching device is configured to controllably open the second air return opening and close the first air return opening.