CN217979459U - Return airway subassembly and refrigerator - Google Patents

Abstract

The utility model discloses a return air duct subassembly and refrigerator, the return air duct subassembly includes first apron, the second apron, the insulating board with shelter from the device, first apron is provided with the first return air inlet of intercommunication storeroom, the second apron is provided with the second return air inlet of intercommunication evaporation cavity, the insulating board sets up between first apron and second apron, the insulating board is provided with the return air passageway, shelter from the device including shielding piece and driving piece, the driving piece is used for driving shielding piece and removes between primary importance and secondary importance, when changing the frost, driving piece drive shielding piece removes to the secondary importance and makes storeroom and evaporation cavity cut off, can reduce the hot convection of the hot-air of evaporation cavity and the cold air of storeroom, avoid the food in the storeroom to lead to rotting because the temperature rise is too big, can reduce required energy consumption when storeroom refrigerates again simultaneously, be favorable to improving the efficiency of refrigerator, the efficiency of changing the frost has been improved simultaneously.

Description

Return airway subassembly and refrigerator

Technical Field

The utility model relates to the technical field of household appliances, in particular to return air duct assembly and refrigerator.

Background

Among the correlation technique, the refrigerator is provided with the return air duct of intercommunication evaporation cavity and storeroom, and the refrigerator is normal during operation, and the hot-air that the fan drove the storeroom flows into evaporation cavity through the return air duct, thereby the evaporimeter in hot-air and the evaporation cavity carries out the heat transfer and forms cold air, and cold air flows back to the storeroom again to make the temperature of storeroom can maintain lower temperature. After the refrigerator is refrigerated for a long time, part of water vapor can frost on an evaporator of the evaporation chamber, so that the heat exchange performance of the evaporator is reduced, and therefore the frost on the evaporator needs to be heated and melted regularly. However, in the defrosting process, hot air in the evaporation chamber can be subjected to heat convection with cold air in the storage chamber through the air return duct, so that the defrosting efficiency is reduced, the temperature of the storage chamber is increased, food in the storage chamber is heated too much to cause deterioration, the humidity of the storage chamber is increased, more energy consumption is needed when the storage chamber is cooled again after the temperature is increased, and the energy efficiency of the refrigerator is reduced.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a return air duct assembly can reduce the cold air of storeroom and the hot-air's of evaporation cavity heat convection when changing the frost, improves and changes white efficiency.

The utility model also provides a refrigerator of having above-mentioned return air duct subassembly.

According to the utility model discloses return air duct assembly of first aspect embodiment, include:

the first cover plate is provided with a first air return opening communicated with the storage chamber;

the second cover plate is provided with a second air return inlet communicated with the evaporation chamber;

the heat insulation plate is arranged between the first cover plate and the second cover plate and is provided with a return air channel, one end of the return air channel is communicated with the first return air inlet, and the other end of the return air channel is communicated with the second return air inlet;

the shielding device comprises a shielding piece and a driving piece, the driving piece is used for driving the shielding piece to move between a first position and a second position, the shielding piece can enable the storage chamber to be communicated with the evaporation chamber at the first position, and the shielding piece can enable the storage chamber to be isolated from the evaporation chamber at the second position.

According to the utility model discloses return air duct subassembly of first aspect embodiment has following beneficial effect at least:

when defrosting, the driving piece drives the shielding piece to move to the second position to separate the storage chamber from the evaporation chamber, so that hot water vapor in the evaporation chamber can be prevented from sequentially passing through the second air return opening, the air return channel and the first air return opening to enter the storage chamber, the heat convection of the hot air in the evaporation chamber and cold air in the storage chamber can be reduced, the temperature rise amplitude of the storage chamber during defrosting is reduced, the humidity rise amplitude of the storage chamber is reduced, the low-temperature and low-humidity environment of the storage chamber is favorably kept, the food in the storage chamber is prevented from deteriorating due to overlarge temperature rise, meanwhile, the energy consumption required when the storage chamber refrigerates again can be reduced, the energy efficiency of the refrigerator is favorably improved, and the hot water vapor in the evaporation chamber can be fully subjected to heat exchange with frost in the evaporator due to the reduction of the heat convection between the evaporation chamber and the storage chamber, the defrosting efficiency is improved, and the energy consumption of the refrigerator is favorably further reduced.

According to some embodiments of the invention, the first return air opening is configured as a grille air opening, the grille air opening comprising a plurality of elongated openings.

According to some embodiments of the invention, the shield is provided with a scraper facing the elongated opening.

According to some embodiments of the utility model, follow first return air inlet orientation the direction of second return air inlet, the diapire downward sloping setting of return air passageway.

According to some embodiments of the invention, the bottom wall is provided with a heat generating device.

According to some embodiments of the utility model, the shielding part includes shielding part and transmission portion, shielding part with transmission portion connects, transmission portion is provided with the rack, the driving piece includes motor and gear, the gear install in the output of motor, the rack with gear engagement connects.

According to some embodiments of the utility model, the shielding part is provided with the guide way, first apron is provided with the guide block, guide block slidable mounting in the guide way.

According to some embodiments of the utility model, shelter from the device and still include the heat preservation, the heat preservation install in shelter from the piece and keep away from one side of first return air mouth.

According to some embodiments of the invention, the first cover plate and the second cover plate are metal cover plates, the first cover plate and the second cover plate are connected by a heat insulation member.

According to the utility model discloses refrigerator of second aspect embodiment, include the utility model discloses return air duct assembly of first aspect embodiment.

According to the utility model discloses refrigerator of second aspect embodiment has following beneficial effect at least:

the air return channel assembly is provided with the shielding device, and when defrosting, the driving piece drives the shielding piece to move to the second position to separate the storage chamber from the evaporation chamber, so that hot water vapor in the evaporation chamber can be prevented from entering the storage chamber through the second air return opening, the air return channel and the first air return opening sequentially, the heat convection of the hot air in the evaporation chamber and cold air in the storage chamber can be reduced, the temperature rise amplitude of the storage chamber during defrosting is reduced, the humidity rise amplitude of the storage chamber is reduced, the low-temperature and low-humidity environment of the storage chamber is favorably maintained, food in the storage chamber is prevented from deteriorating due to excessive temperature rise, meanwhile, the energy consumption required when the storage chamber refrigerates again can be reduced, the energy efficiency of the refrigerator is favorably improved, and due to the reduction of the heat convection of the evaporation chamber and the storage chamber, the hot water vapor in the evaporation chamber can be fully subjected to heat exchange with frost in the evaporator, the defrosting efficiency is improved, and the energy consumption of the refrigerator is favorably further reduced.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural view of a blocking member of a return air duct assembly according to some embodiments of the present invention in a first position;

FIG. 2 is a cross-sectional view of the return air duct assembly of FIG. 1;

fig. 3 is a schematic structural view of a blocking member of the return air duct assembly according to some embodiments of the present invention in a second position;

FIG. 4 is a schematic cross-sectional view of the return air duct assembly of FIG. 3;

FIG. 5 is an enlarged view of a portion of FIG. 4 at A;

fig. 6 is a schematic structural view of another angle of the return air duct assembly according to some embodiments of the present invention (the first cover plate is omitted);

fig. 7 is a schematic structural view of a blocking member of a return air duct assembly according to some embodiments of the present invention.

The reference numbers are as follows:

a first cover plate 100; a first return air opening 110; the elongated opening 111; a guide block 112;

a second cover plate 200; a second air return opening 210;

a heat insulating plate 300; a return air duct 310; a bottom wall 311; a heat generating device 312; an avoidance groove 313; a wiring groove 314;

a shielding device 400; a shield 410; a shielding portion 411; a transmission part 412; a rack 413; a guide groove 414; a doctor blade 415; a driver 420; a motor 421; a gear 422; and a thermal insulation member 430.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, if there are first and second descriptions for distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the precedence of the indicated technical features.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

Among the correlation technique, the refrigerator is provided with the return air duct of intercommunication evaporation cavity and storeroom, and the refrigerator is normal during operation, and the hot-air that the fan drove the storeroom flows in evaporation cavity through return air duct, thereby the evaporimeter in hot-air and the evaporation cavity carries out the heat transfer and forms the cold air, and the cold air flows back to the storeroom again to make the temperature of storeroom can maintain lower temperature. After the refrigerator is refrigerated for a long time, part of water vapor can frost on an evaporator of the evaporation chamber, so that the heat exchange performance of the evaporator is reduced, and the frost on the evaporator needs to be heated and melted regularly. However, in the defrosting process, hot air in the evaporation chamber can be subjected to heat convection with cold air in the storage chamber through the air return channel, so that the defrosting efficiency is reduced, the temperature of the storage chamber is increased, food in the storage chamber is heated excessively to cause deterioration, the humidity of the storage chamber is increased, more energy consumption is required when the storage chamber is cooled again after heating, and the energy efficiency of the refrigerator is reduced.

Therefore, the utility model provides a return air duct assembly, this return air duct assembly can reduce the cold air of storeroom during the defrosting and the hot-air's of evaporation cavity heat convection, improves the efficiency of defrosting.

Referring to fig. 1 to 4, an embodiment of the present invention provides a return air duct assembly, including a first cover plate 100, a second cover plate 200, a thermal insulation plate 300 and a shielding device 400, wherein the first cover plate 100 is provided with a first return air opening 110 communicating with a storage chamber. The second cover plate 200 is provided with a second return air inlet 210 communicating with the evaporation chamber. The thermal insulation plate 300 is interposed between the first cover plate 100 and the second cover plate 200, and thus the contact area between the first cover plate 100 and the second cover plate 200 can be reduced. The thermal insulation panel 300 is made of a material having good thermal insulation properties, such as a thermal insulation foam, so that heat transfer between the first cover sheet 100 and the second cover sheet 200 can be reduced. The heat insulating plate 300 is provided with a return air passage 310, and one end of the return air passage 310 is communicated with the first return air inlet 110, and the other end is communicated with the second return air inlet 210. The shielding device 400 includes a shielding member 410 and a driving member 420, the driving member 420 is used for driving the shielding member 410 to move between a first position and a second position, the shielding member 410 can conduct the storage chamber and the evaporation chamber when in the first position, at this time, the air flow can flow between the evaporation chamber and the storage chamber to realize heat exchange, and the shielding member 410 can isolate the storage chamber from the evaporation chamber when in the second position, at this time, the air flow cannot flow between the evaporation chamber and the storage chamber. Specifically, the shielding member 410 may be disposed between the first cover plate 100 and the thermal insulation plate 300, so as to open the first air return opening 110 to conduct the air return channel 310, and close the first air return opening 110 to close the air return channel 310. Of course, the shielding member 410 may also be disposed between the second cover plate 200 and the thermal insulation plate 300, so that the conduction of the return air channel 310 is realized by opening the second return air inlet 210, and the closure of the return air channel 310 is realized by closing the second return air inlet 210; alternatively, the shielding member 410 may be disposed inside the heat insulating plate 300, and the shielding member 410 may move vertically to open or close the return air duct 310.

When the refrigerator is used for refrigerating, referring to fig. 3 and 4, the driving member 420 drives the shielding member 410 to move to the first position, so that the storage chamber is conducted with the evaporation chamber, at this time, hot airflow of the storage chamber enters the return air channel 310 through the first return air inlet 110 of the first cover plate 100, then enters the evaporation chamber from the second return air inlet 210 of the second cover plate 200, and the hot airflow exchanges heat with the evaporator in the evaporation chamber to become cold airflow, and then is sent back to the refrigerating chamber through the air supply channel. When the refrigerator defrosts, referring to fig. 1 and 2, the driving member 420 drives the shielding member 410 to move to the second position to separate the storage chamber from the evaporation chamber, so that hot water vapor in the evaporation chamber can be prevented from entering the storage chamber through the second air return 210, the air return channel 310 and the first air return 110 in sequence, thereby reducing heat convection between the hot air in the evaporation chamber and cold air in the storage chamber, reducing the temperature rise range of the storage chamber during defrostation, reducing the humidity rise range of the storage chamber, being beneficial to maintaining the low-temperature and low-humidity environment of the storage chamber, avoiding food in the storage chamber from deteriorating due to excessive temperature rise, reducing energy consumption required when the storage chamber refrigerates again, being beneficial to improving energy efficiency of the refrigerator, and improving defrosting efficiency and being beneficial to further reducing energy consumption of the refrigerator.

It should be noted that, in some embodiments of the present invention, referring to fig. 4 and 5, in order to prevent the articles in the storage room from entering the return air channel 310 through the first return air inlet 110, the first return air inlet 110 is configured as a grid air inlet, the grid air inlet is formed by a plurality of strip-shaped openings 111, and the width of the strip-shaped openings 111 is relatively small, so that the articles can be blocked from entering the return air channel 310, and the articles can be prevented from entering the return air channel 310 to block the return air channel 310.

It should be noted that, when the refrigerator is refrigerated, the temperature in the evaporation chamber is lower than the temperature in the storeroom, therefore the hot air flow in the storeroom enters the evaporation chamber through the first return air inlet 110 by the return air channel 310, and partial water vapor in the air flow can condense into frost at the long strip-shaped opening 111, causing the blockage of the first return air inlet 110, for this reason, in some embodiments of the present invention, referring to fig. 5, the shielding member 410 is disposed between the first cover plate 100 and the heat insulating plate 300, the heat insulating plate 300 is provided with the avoiding groove 313 for avoiding the shielding member 410 and the driving member 420, the shielding member 410 can be conducted or cut off by opening or closing the first return air inlet 110 to realize the storeroom and the evaporation chamber, and the shielding member 410 is further provided with the scraper 415 matched with the long strip-shaped opening 111, and the scraper 415 stretches out towards the long strip-shaped opening 111 to be set. Specifically, the scraper 415 is provided in plural, and when the shielding member 410 moves between the first position and the second position, the scraper 415 can scrape the frost on the elongated opening 111, so that the first air return opening 110 can be prevented from being blocked. Specifically, when the refrigerator normally works, the driving member 420 can be controlled to periodically drive the shielding member 410 to move, so that frost at the air opening of the grille can be periodically scraped, and the first air return opening 110 is prevented from being blocked.

It should be noted that, the below of evaporimeter is provided with the water receiving tank, after the frost of grid wind gap was struck off by scraper 415, partial refrigerator can drop to in the water receiving tank, and partial frost can drop and pile up on the diapire 311 of return air passageway 310, in order to reduce the frost and pile up on the diapire 311 of return air passageway 310 and influence the unobstructed of return air passageway 310, in some embodiments of the utility model, refer to fig. 4, along first return air inlet 110 towards the direction of second return air inlet 210, the diapire 311 of return air passageway 310 downward sloping gradually, consequently after the frost drops to the diapire 311 of return air passageway 310, the frost will slide down to the water receiving tank of below gradually under the effect of self gravity to reduce the piling up of refrigerator on the diapire 311 of return air passageway 310.

It can be understood that when the frost drops to the bottom wall 311 of the return air channel 310 from the first return air inlet 110, the frost may condense on the bottom wall 311 of the return air channel 310 and cannot slide to the water receiving tank below, for this reason, in some embodiments of the present invention, referring to fig. 4, the heating device 312 is installed on the bottom wall 311, and the heating device 312 can melt the refrigerator on the bottom wall 311 of the return air channel 310 when operating, so as to avoid the accumulation of the frost on the bottom wall 311 of the return air channel 310. The heat generating device 312 may be a heat generating tube, which may be periodically activated by a control system of the refrigerator.

It should be noted that, in order to enable the shielding member 410 to move more reliably, in some embodiments of the present invention, referring to fig. 6 and fig. 7, the shielding member 410 includes a shielding portion 411 and a transmission portion 412, the shielding portion 411 is connected to the transmission portion 412, the transmission portion 412 is provided with a rack 413, the driving member 420 includes a motor 421 and a gear 422, the motor 421 is mounted on the first cover plate 100, the thermal insulating plate 300 is further provided with a wiring slot 314 for arranging a wiring of the motor 421, the gear 422 is mounted at an output end of the motor 421, and the rack 413 is connected to the gear 422 in a meshing manner. When the motor 421 rotates, the output end drives the gear 422 to rotate, and the gear 422 drives the transmission portion 412 to move, so that the shielding portion 411 moves to close or open the first air return opening 110. The movement of the shutter 410 is more reliable by the cooperation of the motor 421, the gear 422 and the rack 413.

It can be understood that, in order to improve the stability of the movement of the shielding member 410, in some embodiments of the present invention, the shielding member 410 is provided with the guide groove 414, the first cover plate 100 is provided with the guide block 112, the guide block 112 is slidably mounted in the guide groove 414, and when the shielding member 410 moves, the shielding member 410 can move smoothly along the length direction of the guide groove 414 by the cooperation of the guide block 112 and the guide groove 414, so as to prevent the shielding member 410 from shaking too much, thereby improving the stability of the movement of the shielding member 410. Specifically, the guide groove 414 is elongated, the guide block 112 may be square column-shaped or cylindrical, and the guide block 112 may be screwed or otherwise mounted on the first cover plate 100, and the guide block 112 is located in the guide groove 414 and can slide relative to the guide groove 414.

It should be noted that, in some embodiments of the present invention, referring to fig. 6 and 7, the guide groove 414 is provided in plural, the guide block 112 is also provided in plural corresponding to the guide groove 414, and the plurality of guide blocks 112 and the plurality of guide grooves 414 are provided in one-to-one correspondence. Wherein a part of the guide groove 414 is provided at the driving part 412 and the remaining part of the guide groove 414 is provided at the shielding part 411, thereby making the movement of the shielding member 410 more smooth. Specifically, in one embodiment, the guide portion is connected to the middle of the shielding portion 411, at this time, three guide grooves 414 are provided, one of the guide grooves 414 is provided in the transmission portion 412, the other two guide grooves 414 are respectively provided at two ends of the shielding portion 411 in the length direction, the three guide grooves 414 are arranged in parallel in the vertical direction, correspondingly, three guide blocks 112 are provided, the three guide blocks 112 correspond to the three guide grooves 414 one to one, and the three guide blocks 112 are respectively installed in the corresponding guide grooves 414, so that when the shielding member 410 moves, the three guide blocks 112 can guide the shielding member 410, and therefore the moving stability of the shielding member 410 can be effectively improved.

It should be noted that, in order to further reduce the heat exchange between the hot air in the evaporation chamber and the cold air in the storage chamber during defrosting, in some embodiments of the present invention, referring to fig. 2 and fig. 6, the shielding device 400 further includes a heat preservation member 430, the heat preservation member 430 is installed on one side of the shielding member 410 away from the first air return opening 110, and the heat preservation member 430 can play a role of heat insulation, so as to reduce the heat exchange. Specifically, the heat insulating member 430 may be made of heat insulating foam or other materials with good heat insulating performance.

It should be noted that although the plastic has a good heat insulation performance, it is easy to be embrittled and broken in a low temperature environment, and therefore, in order to prevent the first cover plate 100 and the second cover plate 200 from being embrittled easily in a low temperature environment, in some embodiments of the present invention, the first cover plate 100 is a metal cover plate, the second cover plate 200 is also a metal cover plate, the metal cover plate may be made of an aluminum alloy or other metal materials, and still has a good toughness and is not easy to embrittle in a low temperature environment of the refrigerator, however, since the metal cover plate has a good heat conduction performance, in order to reduce the heat transfer from the evaporation chamber to the storage chamber through the first cover plate 100 and the second cover plate 200 during defrosting, in some embodiments, the first cover plate 100 and the second cover plate 200 are connected and fixed through a heat insulation member, which may be a plastic member or other structural member, thereby preventing the first cover plate 100 and the second cover plate 200 from directly contacting, and further effectively reducing the heat transfer from the evaporation chamber to the storage chamber through the two cover plates, thereby reducing the heat rise during defrosting.

The utility model discloses refrigerator of second aspect embodiment, include the utility model discloses return air duct assembly of first aspect embodiment. The refrigerator may be a cryogenic refrigerator, or other type of refrigerator. The refrigerator comprises a refrigerator body, an air return channel assembly and an air supply channel assembly, wherein the refrigerator body is provided with a storage chamber and an evaporation chamber, two ends of the air return channel assembly are respectively communicated with the storage chamber and the evaporation chamber, and two ends of the air supply channel assembly are respectively communicated with the evaporation chamber and the storage chamber. When the refrigerator refrigerates, hot air of the storeroom enters the evaporation cavity through the air return channel assembly, the hot air is changed into cold air through heat exchange of the evaporator in the evaporation cavity, and then the cold air returns to the storeroom through the air supply channel, so that the storeroom can refrigerate articles placed in the storeroom.

When the refrigerator is refrigerated, the driving part 420 drives the shielding part 410 to move to the first position, so that the storage chamber is communicated with the evaporation chamber, at this time, hot airflow of the storage chamber enters the return air channel 310 through the first return air inlet 110 of the first cover plate 100, then enters the evaporation chamber from the second return air inlet 210 of the second cover plate 200, and the hot airflow exchanges heat with an evaporator in the evaporation chamber to become cold airflow, and then is sent back to the refrigeration chamber through the air supply channel. When the refrigerator defrosts, the driving member 420 drives the shielding member 410 to move to the second position to separate the storage chamber from the evaporation chamber, so that hot water vapor in the evaporation chamber can be prevented from entering the storage chamber through the second air return inlet 210, the air return channel 310 and the first air return inlet 110 in sequence, heat convection of hot air in the evaporation chamber and cold air in the storage chamber can be reduced, the temperature rise amplitude of the storage chamber during defrostation is reduced, the humidity rise amplitude of the storage chamber is reduced, the low-temperature and low-humidity environment of the storage chamber is favorably maintained, food in the storage chamber is prevented from deteriorating due to overlarge temperature rise, meanwhile, energy consumption required by the storage chamber during refreezing can be reduced, the energy efficiency of the refrigerator is favorably improved, and due to the reduction of the heat convection of the evaporation chamber and the storage chamber, the hot water vapor in the evaporation chamber can be fully thermally exchanged with frost in the evaporator, the defrosted efficiency is improved, and the energy consumption of the refrigerator is favorably further reduced.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge scope of those skilled in the art.

Claims (10)

1. Return air duct assembly, its characterized in that includes:

the first cover plate is provided with a first air return opening communicated with the storage chamber;

the second cover plate is provided with a second air return inlet communicated with the evaporation chamber;

the heat insulation plate is arranged between the first cover plate and the second cover plate and is provided with a return air channel, one end of the return air channel is communicated with the first return air inlet, and the other end of the return air channel is communicated with the second return air inlet;

the shielding device comprises a shielding piece and a driving piece, the driving piece is used for driving the shielding piece to move between a first position and a second position, the shielding piece can enable the storage chamber to be communicated with the evaporation chamber at the first position, and the shielding piece can enable the storage chamber to be separated from the evaporation chamber at the second position.

2. The return duct assembly of claim 1, wherein the first return air opening is configured as a grille opening, the grille opening including a plurality of elongated openings.

3. The return duct assembly of claim 2, wherein the shield is provided with a scraper facing the elongated opening.

4. The return duct assembly of claim 3, wherein a bottom wall of the return duct is inclined downwardly in a direction from the first return opening toward the second return opening.

5. The return air duct assembly according to claim 4, wherein the bottom wall is mounted with a heat generating device.

6. The return air duct assembly according to claim 3, wherein the shielding member includes a shielding portion and a transmission portion, the shielding portion is connected to the transmission portion, the transmission portion is provided with a rack, the driving member includes a motor and a gear, the gear is mounted to an output end of the motor, and the rack is connected to the gear in a meshing manner.

7. The return air duct assembly according to claim 6, wherein the shield is provided with a guide groove, and the first cover plate is mounted with a guide block slidably mounted in the guide groove.

8. The return air duct assembly according to claim 3, wherein the shielding device further comprises a heat insulating member mounted on a side of the shielding member away from the first return air opening.

9. The return duct assembly according to any one of claims 1 to 8, wherein the first cover plate and the second cover plate are metal cover plates, and the first cover plate and the second cover plate are connected by a heat insulator.

10. A refrigerator comprising the return duct assembly of any one of claims 1 to 9.

Images