WO2022037381A1 - Air-cooled refrigerator - Google Patents

Abstract

An air-cooled refrigerator, comprising a bottom liner, a plurality of upper liners, and a return air duct. The bottom of the bottom liner is provided with a refrigerating cavity for providing an evaporator of the refrigerator, and is provided with a side return air opening in communication with the refrigerating cavity; the plurality of upper liners are arranged in sequence above the bottom liner, and each upper liner is provided with an exhaust opening; the return air duct extends downwards to the side return air opening along the exhaust openings of the plurality of upper liners to introduce the return air flow of the plurality of upper liners into the refrigerating cavity. In the air-cooled refrigerator of the present invention, a single return air duct is used to divert the return air flow of the refrigerating cavity and a variable temperature cavity, thereby effectively saving the foaming space of the refrigerator, improving the heat preservation performance of the refrigerator, and reducing the cost of the refrigerator.

Description

air-cooled refrigerator technical field

The invention relates to refrigeration and freezing technology, in particular to an air-cooled refrigerator.

Background technique

In the refrigerator with the evaporator at the bottom in the prior art, the return air duct is mainly used to introduce the return air flow of the variable temperature compartment to the cooling compartment located at the bottom of the refrigerator, while the refrigeration compartment located at the top of the refrigerator adopts an independent air supply system. This design has certain defects. For example, the return air duct can only ensure variable temperature return air, which has certain limitations; and the two independent air supply systems must occupy more foaming space, which not only affects the heat load, but also has certain limitations. Added the cost of the refrigerator.

SUMMARY OF THE INVENTION

One object of the present invention is to overcome at least one defect in the prior art and provide an air-cooled refrigerator.

A further object of the present invention is to use a separate return air duct to guide the return air flow of the upper inner tank into the cooling chamber for an air-cooled refrigerator with a cooling chamber located at the bottom.

Another further object of the present invention is to improve the heat exchange efficiency of the refrigerator.

In particular, the present invention provides an air-cooled refrigerator, comprising:

a bottom inner tank, the bottom of which is provided with a cooling chamber for arranging the evaporator of the refrigerator, and is provided with a side air return port leading to the cooling chamber;

A plurality of upper inner pots are arranged in sequence above the bottom inner pot, and each upper inner pot is provided with an air outlet;

A return air duct extends down to the side air return openings along the plurality of air exhaust openings of the upper inner bladder, so as to introduce the return air flow of the plurality of upper inner bladders into the cooling chamber.

Further, a plurality of the air exhaust openings are arranged at positions corresponding to the rear wall of the upper inner container close to one side edge.

Further, the upper liner includes a first upper liner located above the bottom liner and a second upper liner located above the first upper liner; wherein

The space above the cooling chamber of the bottom liner is configured as a freezing chamber;

The inner space of the first upper inner liner is configured as a greenhouse;

The inner space of the second upper inner container is configured as a refrigerator compartment.

Further, the section of the air return duct located between the second upper inner bladder and the first upper inner bladder is gradually bent to extend from the position where the air outlet of the second upper inner bladder is located. To the position where the air outlet of the first upper inner tank is located.

Further, the air-cooled refrigerator also includes:

A partition cover plate, which is laterally arranged in the bottom inner tank, is used to separate the cooling chamber and the freezing chamber; and

Areas of the bottom surface of the bottom liner close to both sides protrude upward to form support parts for supporting the partition cover,

The evaporator is arranged in the concave area between the support parts.

Further, the air-cooled refrigerator also includes:

an air return hood, which is arranged at the front of the cooling chamber, and is provided with at least one forward air return port that communicates with the cooling chamber and the freezing chamber;

There is a set interval between the front end of the support part on one side and the air return hood, and

The side air return port is disposed at the front end of the support part, so that the air from the air return duct enters the cooling chamber from the space between the front end of the support part and the air return hood.

Further, after the air return duct extends from the outside of the rear wall of the bottom liner to the outside of the bottom wall of the bottom liner, it extends along the outside of the bottom wall of the bottom liner to the side air return port. connected.

Further, the evaporator is a fin evaporator, which includes:

A group of fins are arranged in parallel along the front and rear directions of the refrigerator;

an evaporation tube, which is inserted between the fins;

The support end plates are arranged on both sides of the fins, and the front end of the support end plates close to the side of the side air return port is bent to the support part to form a shielding part, so as to use the shielding part to avoid airflow Pass through the gap between the evaporator and the support part.

Further, the air-cooled refrigerator also includes:

The centrifugal fan is arranged obliquely at the rear of the evaporator, and its air suction port faces the front and upper side, and its air outlet faces the rear;

The air supply air duct communicates with the air outlet of the centrifugal fan and extends upward, and is configured to deliver the airflow discharged from the centrifugal fan to the freezing chamber and/or the changing chamber and/or the refrigerating chamber.

Further, the air return duct is a flat square tube, and uses a wider side to abut on the bottom inner bladder and the plurality of upper inner bladders.

In the air-cooled refrigerator of the present invention, the cooling chamber is arranged at the bottom of the bottom inner liner, the upper inner liner is located above the bottom inner liner, and each upper inner liner is provided with an air outlet, and the bottom inner liner is provided with a cooling chamber. Connected side air return ports, the return air duct extends down to the side air return ports along the exhaust ports of the multiple upper liner, so as to introduce the return air flow of the multiple upper liner into the cooling chamber to continue with the evaporator. Heat exchange to form circulating air flow.

Further, in the air-cooled refrigerator of the present invention, a plurality of exhaust ports are arranged in the position of the rear wall of the corresponding upper inner tank close to one side edge, and the return air duct is located in the second upper inner tank and in the first upper inner tank. The section between the bladders is gradually curved, which can avoid that when the return air duct is vertical and there are return air flows from the refrigerating room and the changing room at the same time, the return air flow of the refrigerating room enters the changing room through the first air outlet , which offsets or suppresses the tendency of the return air flow of the variable room to enter the refrigerating room upward through the second air outlet, reducing the pressure loss of the return air duct and improving the heat exchange efficiency of the refrigerator.

The above and other objects, advantages and features of the present invention will be more apparent to those skilled in the art from the following detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings.

Description of drawings

Hereinafter, some specific embodiments of the present invention will be described in detail by way of example and not limitation with reference to the accompanying drawings. The same reference numbers in the figures designate the same or similar parts or parts. It will be understood by those skilled in the art that the drawings are not necessarily to scale. In the attached picture:

1 is a schematic diagram of a refrigerator according to an embodiment of the present invention;

FIG. 2 is a longitudinal sectional view of a refrigerator according to an embodiment of the present invention, wherein the upper inner container is hidden;

Figure 3 is an exploded view of a refrigerator according to an embodiment of the present invention, wherein the casing is hidden;

Figure 4 is a schematic diagram of the positional relationship of the bottom liner, the first upper liner, and the second upper liner in a refrigerator according to an embodiment of the present invention;

FIG. 5 is a rear view of a refrigerator according to an embodiment of the present invention, wherein the casing is hidden;

FIG. 6 is a left side view of a refrigerator according to an embodiment of the present invention, wherein the casing is hidden;

7 is a transverse cross-sectional view of a bottom inner container of a refrigerator according to an embodiment of the present invention.

detailed description

In the description of this embodiment, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", The orientation or placement relationship indicated by "left", "right", "vertical", "horizontal", "top", "bottom", "depth", etc. is based on the orientation of the refrigerator under normal use as a reference, and refer to the appendix The orientation or positional relationship shown in the figure can be determined, for example, "front" indicating orientation refers to the side of the refrigerator facing the user. This is only to facilitate the description of the present invention and to simplify the description, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as a limitation of the present invention.

Referring to FIG. 1 , the refrigerator 1 of this embodiment may generally include a box body 10 , and the box body 10 may include an outer shell, an inner tank, a heat insulation layer, and other accessories. The casing is the outer structure of the refrigerator 1 and protects the entire refrigerator 1 . In order to isolate the heat conduction with the outside world, a heat insulating layer is added between the outer shell and the inner tank of the box body 10 , and the heat insulating layer is generally formed by a foaming process. There can be one or more inner liner, which can be arbitrarily divided into refrigerating inner liner, temperature-changing inner liner, freezing inner liner, etc. according to the function. In this embodiment, the inner container at least includes a bottom inner container 110, and the bottom inner container 110 can generally be a frozen inner container.

Referring to FIG. 2 , a cooling chamber 140 is disposed at the bottom of the bottom inner container 110 of the refrigerator 1 in this embodiment, and an evaporator 220 is disposed in the cooling chamber 140 , and the evaporator 220 provides cooling capacity for the refrigerator 1 . Specifically, a partition cover plate 210 is provided below the bottom inner tank 110 , and the partition cover plate 210 is laterally arranged in the bottom inner tank 110 to separate the bottom inner tank 110 from the cooling chamber 140 and the freezing chamber located above the cooling chamber 140 160.

That is, the evaporator 220 in this embodiment is located below the bottom inner container 110, and this arrangement can avoid the evaporator in the conventional refrigerator occupying the rear space of the freezer compartment, thereby reducing the depth of the freezer compartment, especially for side-to-side doors. For a refrigerator 1 , when the lateral size of the freezer is small, it is particularly important to increase the depth of the freezer, thereby improving the space utilization rate of the refrigerator 1 and facilitating the storage of bulky and difficult-to-separate items.

In addition, in traditional refrigerators, the freezer compartment at the bottom is located at a relatively low position, and the user needs to bend or squat down significantly to pick up and place items in the freezer compartment, which is inconvenient for users, especially for the elderly. In this embodiment, since the cooling chamber 140 occupies the space below the bottom liner 110 , the height of the freezing chamber 160 above the cooling chamber 140 is raised, and the bending degree of the user when picking and placing items in the freezing chamber 160 is reduced. , which can improve the user experience.

Referring to FIG. 3 , in this embodiment, the evaporator 220 may be a flat rectangular parallelepiped as a whole, which is arranged at the front of the cooling chamber 140 and is inclined in the cooling chamber 140 . This method breaks through the technical shackles of the existing technology that reduce the depth dimension and need to place the evaporator horizontally. Although the oblique placement of the flat rectangular parallelepiped evaporator 220 will lead to an increase in the length in the front and rear directions, the oblique placement of the evaporator 220 makes the arrangement of other components in the cooling chamber 140 more reasonable, and the actual air flow field analysis confirms that the air circulation efficiency is also higher, and the drainage Also more comfortable. The oblique arrangement of the evaporator 220 is one of the main technical improvements made in this embodiment. In some specific embodiments, the inclination angle range of the evaporator 220 is set to 7° to 8°, for example, it can be set to 7°, 7.5°, 8°, preferably 7.5°.

Referring to FIGS. 2 and 3 , in this embodiment, the refrigerator 1 may further include an air supply assembly, and the air supply assembly is disposed behind the evaporator 220 . The air supply assembly may include a centrifugal fan and an air supply air duct 150 . The centrifugal fan is disposed obliquely at the rear of the evaporator 220, with its air suction port facing forward and downward, and the air outlet facing the rear, and is configured to promote the formation of a cooling airflow sent to the freezing chamber 160 through the evaporator 220. The air supply duct 150 is connected to the centrifugal fan. The air outlet of the fan communicates and extends upward, and is configured to deliver the airflow discharged from the centrifugal fan to the freezing chamber 160 . The ratio of the horizontal distance from the front end of the centrifugal fan to the evaporator 220 to the depth dimension of the casing 10 in the front-rear direction is less than 4.5%, for example, set to 4.3%.

2 and 3, the refrigerator 1 may further include an air duct back panel 240. The air duct back panel 240 is disposed in front of the rear wall of the bottom inner pot 110, and may be substantially parallel to the rear wall of the bottom inner pot 110, so as to The air supply air duct 150 is defined together with the rear wall of the bottom inner pot 110 , and the air supply air duct 150 communicates with the air outlet of the centrifugal fan and extends upward. In addition, the air duct back plate 240 is provided with at least one air supply port 242 , and the air supply port 242 is used to communicate with the air supply air duct 150 and the freezer compartment 160 . Since the air supply air duct 150 communicates with the cooling chamber 140, and the partition cover plate 210 serves as a partition of the cooling chamber 140, the air duct back plate 240 can abut against the partition cover plate 210 to seal the cooling chamber 140 and the cooling chamber 140. The role of the gap between the air supply air ducts 150.

Referring to FIGS. 2 and 3 , the centrifugal fan may further include fan blades 250 , a fan upper cover 252 and a fan bottom casing 254 . The upper cover 252 of the fan is inclined and protrudes downward into the cooling chamber 140 from the lower end of the air duct back plate 240 , the bottom casing 254 of the fan is covered and fastened on the upper cover 252 of the fan, and the fan blades 250 are arranged on the upper cover 252 of the fan and the bottom casing 254 of the fan. inside the fan cavity (not numbered in the figure). The air duct back plate 240 and the fan upper cover 252 can also be configured as an integral molded part, so as to simplify the installation process, reduce the cost, and make the entire air duct structure more stable.

Referring to FIGS. 1 to 3 , the refrigerator 1 may further include a return air cover 230 . The return air cover 230 is disposed at the front of the cooling chamber 140 and is provided with at least one front air return port 232 connecting the cooling chamber 140 and the freezing chamber 160 .

The evaporator 220 in the cooling chamber 140 exchanges heat with the surrounding air to reduce its temperature to form a cooling airflow. Under the impetus of the centrifugal fan, the cooling airflow is discharged from the cooling chamber 140 to the air supply air duct 150, and then from the back of the air duct. The air supply port 242 on the plate 240 enters the freezing chamber 160 to exchange heat with the air in the freezing chamber 160 to reduce the temperature of the freezing chamber 160 . After heat exchange, the refrigerated air flow can return to the cooling chamber 140 through the front air return port 232 on the air return hood 230, and continue to exchange heat with the evaporator 220, thereby forming a circulating air flow path.

Referring to FIGS. 3 to 6 , in some embodiments of the present invention, the bottom inner bladder 110 is provided with a side air return port 114 leading to the cooling chamber 140 , and the refrigerator 1 may further include a plurality of upper inner bladders and a return air duct 300, a plurality of upper inner bladders are arranged in sequence above the bottom inner bladder 110, each upper inner bladder 110 is provided with an air outlet, and the return air duct 300 extends down to the side along the air outlet of the plurality of upper inner bladders. To the return air port 114 , the return air flow of the plurality of upper inner bladders is introduced into the cooling chamber 140 .

The side air return port 114 can be located on one side of the cooling chamber 140, so that the return air flow of the upper liner can be discharged to the side of the evaporator 220 through the side return air port 114, so that the return air flow of the upper liner can be connected to the evaporator. The contact path of 220 is extended to improve the heat exchange efficiency.

In this embodiment, each upper liner is configured independently of the bottom liner 110, so that the upper liner no longer occupies the space of the bottom liner 110, and the volume of the freezing chamber 160 defined by the bottom liner 110 can be increased. .

Please refer to FIG. 3 and FIG. 4 , specifically, the upper inner container includes a first upper inner container 120 located above the bottom inner container 110 and a second upper inner container 130 located above the first upper inner container 120. The first upper inner container The rear wall of 120 is provided with a first air outlet 122 , and the rear wall of the second upper inner container 130 is provided with a second air outlet 132 . The air return duct 300 has a lower end pipe port 312 connected with the side air return port 114 , a middle pipe port 314 connected with the first air outlet port 122 , and an upper end pipe port 316 connected with the second air outlet port 132 . That is, the air return duct 300 is integrally extended and disposed at the rear walls of the bottom inner pot 110 , the first upper inner pot 120 and the second upper inner pot 130 .

Referring to FIG. 5 , the rear wall of the first upper inner pot 120 is further provided with a first upper air supply air duct 256 communicating with the air supply air duct 150 of the bottom inner pot 110 and communicating with the first upper air supply air duct 256 The second upper air supply air duct 258. That is, the air supply duct 150 communicates with the first upper air supply air duct 256, or, the air supply air duct 150, the first upper air supply air duct 256 and the second upper air supply air duct 258 are in communication. The refrigerating air flow in the air supply air duct 150 enters the first upper air supply air duct 256 and the second upper air supply air duct 258 under the action of the centrifugal fan, and then the refrigerating air flow can pass through the upper air supply air duct. It is discharged into the upper liner and exchanges heat with the air in the upper liner to reduce the temperature of the upper liner. Since the cooling chamber 140 of the refrigerator 1 is located at the bottom of the bottom inner bladder 110, that is, the bottom of the refrigerator 1, the return air in the upper inner bladder is discharged into the cooling chamber 140 through the return air duct 300, and exchanges heat with the evaporator 220 for cooling. to form a circulating air flow.

In some preferred embodiments, the interior of the first upper inner container 120 can be divided into two storage areas, left and right, and these two storage areas can also be configured as changing rooms, for example, temperature-changing drawers are arranged respectively. The second upper inner container 130 is located above the first upper inner container 120, and the inner space thereof can also be configured as a refrigerator compartment. Specifically, as known to those skilled in the art, the temperature in the refrigerating chamber can also be set between 2°C and 10°C, preferably between 4°C and 7°C; °C. The optimal storage temperature for different types of items is different, and the suitable storage locations are also different. For example, fruit and vegetable food is suitable for storage in the refrigerator.

As described in the background art, for the refrigerator with the bottom evaporator in the prior art, the return air duct is mainly used to introduce the return air flow from the variable temperature compartment to the cooling chamber located at the bottom of the refrigerator, and the refrigerating chamber located at the top of the refrigerator The room adopts an independent air supply system. There are certain defects in this design. For example, the return air duct can only ensure variable temperature return air, which has certain limitations; and the two independent air supply systems must occupy more foaming space, which not only affects the heat load, but also has certain limitations. It adds to the cost of the refrigerator.

The air-cooled refrigerator 1 of this embodiment adopts a single air return duct 300 to guide the return air flow of the refrigerating room and the variable room, which can effectively save the foaming space of the refrigerator 1, reduce the blocking of the foaming layer, and ensure the thickness of the foaming. , the heat preservation performance of the refrigerator 1 can be improved, and the cost of the refrigerator 1 can also be reduced.

In addition, as is well known to those skilled in the art, the temperature of the refrigerating room is higher than that of the changing room and the freezing room, so the air pressure of the return air flow of the refrigerating room is higher. When the air-cooled refrigerator 1 adopts the single return air duct 300 to guide the return air flow of the refrigerating room and the variable room to the cooling room 140 at the same time, the return air flow of the refrigerating room can increase the air pressure of the entire return air duct 300, so that the return air flow of the refrigerating room can increase the air pressure of the whole return air duct 300. The return air flow velocity of the air duct 300 is increased, and the return air efficiency is increased, which further improves the refrigeration effect of the refrigerator 1. The inventor also verified the technical effect on the trial product.

Referring to FIG. 5 and FIG. 6 , in some embodiments of the present invention, a plurality of exhaust ports are disposed at positions of the rear wall of the corresponding upper inner container close to one side edge. By arranging the plurality of air exhaust openings near the edge of one side, the return air duct 300 can be kept in a substantially vertical state as much as possible, so as to ensure the aesthetics of the box body 10 .

The section of the return air duct 300 between the second upper inner pot 130 and the first upper inner pot 120 is gradually bent to extend from the position of the second air outlet 132 of the second upper inner pot 130 to the first upper portion The position where the first air outlet 122 of the inner tank 120 is located.

Referring to FIG. 5 , in this embodiment, a certain distance can be maintained between the first air outlet 122 and the second air outlet 132 in the lateral and horizontal direction, so that the return air duct 300 is located in the second upper inner bladder 130 and is located in the At the position of the first upper inner bladder 120, a transverse horizontal bending section is generated.

Referring to FIG. 6, at the same time, a certain distance can be maintained between the first air outlet 122 and the second air outlet 132 in the horizontal direction of the depth, so that the return air duct 300 is located in the second upper inner bladder 130 and in the first At the position of the upper inner bladder 120, a bending section in the depth and horizontal direction is generated.

The inventor found through experiments that when the return air flow of the refrigerating room and the changing room is simultaneously directed in the return air duct 300, the optimal pipe shape of the return air duct 300 is not completely vertical. When the return air duct 300 is vertical and there are both the return air flow of the refrigerating room and the changing room in the pipe, the return air flow of the refrigerating room can enter the changing room through the first air outlet 122, and the return air flow of the changing room will also There is a tendency to enter the refrigerating room upward through the second air outlet 132 , which reduces the overall flow velocity of the return air in the return air duct 300 , which further reduces the heat exchange efficiency.

In this embodiment, the section of the return air duct 300 between the second upper inner bladder 130 and the first upper inner bladder 120 is bent in the depth and lateral directions at the same time, which can counteract or restrain the above-mentioned tendency of the return air flow , so that when the return air flow of the refrigerating room and the changing room exists in the return air duct 300 at the same time, mutual interference is avoided, the pressure loss of the return air duct 300 is effectively reduced, the heat exchange efficiency is improved, and the above technical effects are also obtained. The verification of trial products has made significant progress.

Referring to FIG. 3 and FIG. 4 , in some embodiments of the present invention, the regions of the bottom surface of the bottom inner pot 110 close to both sides protrude upward to form support portions 112 for supporting the partition cover plate 210 , and the evaporator 220 is disposed at in the concave area between the support parts 112 .

In this embodiment, the area of the bottom surface of the bottom inner pot 110 close to both sides protrudes upward to form the support portion 112 , which can also be understood as the two sides of the area where the rear wall and the bottom wall of the bottom inner pot 110 meet and protrude inward and upward to form the supporting portion 112 . The support part 112, the upper surface of the support part 112 can be used to support the partition cover plate 210, and the middle area of the two support parts 112 forms a concave area relative to the two support parts for arranging the evaporator 220.

Optionally, the bottom surface of the concave area can also be set as an inclined plate from the back to the front, so that the evaporator 220 can be disposed in the cooling chamber 140 obliquely, so as to realize the inclined installation of the evaporator 220 in the above embodiment technical effect.

In addition, the inwardly recessed support portion 112 can also provide a larger space for the compressor cabin located below the cooling chamber 140 , so that the arrangement of the entire box body 10 is more reasonable.

Referring to FIG. 7 , in some embodiments of the present invention, there is a set interval between the front end of the support portion 112 on one side and the air return cover 230 , and the side air return port 114 is disposed at the front end of the support portion 112 to The air from the return air duct 300 is allowed to enter the cooling chamber 140 from the space between the front end of the support part 112 and the return air cover 230 .

In this embodiment, the evaporator 220 is disposed in the concave area formed by the two side support parts 112 , which is located in the center of the cooling chamber 140 , and the side air return port 114 is disposed at the front end of one of the support parts 112 . That is to say, the side air return port 114 is located at the side of the evaporator 220, and the return air cover 230 is located in front of the evaporator 220. A return air area is formed between the return air port 114 and the return air hood 230, and the return air area is located in front of the side of the evaporator 220, that is, the return air flow entering the cooling chamber 140 can be discharged to the side and front of the evaporator 220, This can serve to lengthen the contact path between the return air flow and the evaporator 220, so as to improve the heat exchange efficiency.

Among them, the set interval value can also be configured to any value within the range of 20mm to 60mm, for example, 20mm, 30mm, 50mm, 60mm, etc., to ensure that while improving the return air efficiency of the upper inner tank, it will not affect the bottom inner tank. The normal return air of gallbladder 110.

Referring to FIG. 7 , further, the evaporator 220 may also be a finned evaporator, which includes a set of fins 222 , an evaporation tube 224 and a support end plate 226 . The fins 222 are arranged in parallel along the front-rear direction of the refrigerator 1, and the evaporating tube 224 has a refrigerant in it to provide cooling capacity for the refrigerator 1, and is inserted between the fins 222; the support end plates 226 are arranged on both sides of the fins 222, and The front end of the support end plate 226 on the side close to the side air return port 114 is bent toward the support portion 112 to form a shielding portion to prevent airflow from passing through the gap between the evaporator 220 and the supporting portion 112 .

In this embodiment, the evaporator 220 is disposed in the concave area formed by the two side support parts 112 , and has a certain gap with the side support parts 112 . The support end plate 226 plays the role of blocking the gap, preventing the airflow from passing through the evaporator 220 directly under the action of the centrifugal fan without heat exchange by the evaporator 220 , thereby further improving the cooling efficiency of the refrigerator 1 .

Referring to FIGS. 3 , 5 and 6 , in some embodiments of the present invention, the air return duct 300 extends from the outer side of the rear wall of the bottom inner pot 110 to the outer side of the bottom wall of the bottom inner pot 110 , and then runs along the bottom inner pot 110 . The outer side of the bottom wall extends to connect with the side air return port 114 .

That is, the upper end of the return air duct 300 in this embodiment extends downward from the second air outlet 132 to the first air outlet 122 , and then extends from the first air outlet 122 to the bottom liner 110 . The outer side of the rear wall finally extends approximately laterally to be in contact with the side air return port 114 . That is to say, the air return duct 300 in this embodiment is located at the rear of the inner bladder as a whole. Compared with the side air return duct, this arrangement can reduce the lateral size of the box body 10 , making the box body 10 more reasonable and efficient. beautiful.

Further, the return air duct 300 can also be set as a flat square tube, and use the wider side to abut against the bottom inner liner 110 and a plurality of upper inner liner, which can not only meet the normal return air demand, but also reduce the return air. The lateral dimension occupied by the air duct 300 improves the stability of the return air duct 300 at the same time.

By now, those skilled in the art will recognize that, although various exemplary embodiments of the present invention have been illustrated and described in detail herein, the present invention may still be implemented in accordance with the present disclosure without departing from the spirit and scope of the present invention. The content directly determines or derives many other variations or modifications consistent with the principles of the invention. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims (10)

An air-cooled refrigerator, comprising: a bottom inner tank, the bottom of which is provided with a cooling chamber for arranging the evaporator of the refrigerator, and is provided with a side air return port leading to the cooling chamber; A plurality of upper inner pots are arranged in sequence above the bottom inner pot, and each upper inner pot is provided with an air outlet; A return air duct extends down to the side air return openings along the plurality of air exhaust openings of the upper inner bladder, so as to introduce the return air flow of the plurality of upper inner bladders into the cooling chamber. The air-cooled refrigerator according to claim 1, wherein The plurality of exhaust ports are arranged at positions corresponding to the rear wall of the upper inner bladder close to one side edge. The air-cooled refrigerator according to claim 2, wherein The upper liner comprises a first upper liner located above the bottom liner and a second upper liner located above the first upper liner; wherein The space above the cooling chamber of the bottom liner is configured as a freezing chamber; The inner space of the first upper inner liner is configured as a greenhouse; The inner space of the second upper inner container is configured as a refrigerator compartment. The air-cooled refrigerator according to claim 3, wherein The section of the air return duct located between the second upper inner liner and the first upper inner liner is gradually bent to extend from the position of the air outlet of the second upper inner liner to the The position of the air outlet of the first upper inner tank. The air-cooled refrigerator according to claim 3, further comprising: A partition cover plate, which is laterally arranged in the bottom inner tank, is used to separate the cooling chamber and the freezing chamber; and Areas of the bottom surface of the bottom liner close to both sides protrude upward to form support parts for supporting the partition cover, The evaporator is arranged in the concave area between the support parts. The air-cooled refrigerator according to claim 5, further comprising: an air return hood, which is arranged at the front of the cooling chamber, and is provided with at least one forward air return port that communicates with the cooling chamber and the freezing chamber; There is a set interval between the front end of the support part on one side and the air return hood, and The side air return port is disposed at the front end of the support part, so that the air from the air return duct enters the cooling chamber from the space between the front end of the support part and the air return hood. The air-cooled refrigerator according to claim 6, wherein The air return pipe extends from the outer side of the rear wall of the bottom inner pot to the outer side of the bottom wall of the bottom inner pot, and then extends along the outer side of the bottom wall of the bottom inner pot to connect with the side air return port. The air-cooled refrigerator according to claim 6, wherein The evaporator is a fin evaporator, which includes: A group of fins are arranged in parallel along the front and rear directions of the refrigerator; an evaporation tube, which is inserted between the fins; The support end plates are arranged on both sides of the fins, and the front end of the support end plates close to the side of the side air return port is bent to the support part to form a shielding part, so as to use the shielding part to avoid airflow Pass through the gap between the evaporator and the support part. The air-cooled refrigerator according to claim 8, further comprising: The centrifugal fan is arranged obliquely at the rear of the evaporator, and its air suction port faces the front and upper side, and its air outlet faces the rear; The air supply air duct communicates with the air outlet of the centrifugal fan and extends upward, and is configured to deliver the airflow discharged from the centrifugal fan to the freezing chamber and/or the changing chamber and/or the refrigerating chamber. The air-cooled refrigerator of claim 1, wherein The air return pipe is a flat square pipe, and uses a wider side to abut the bottom inner bladder and the plurality of upper inner bladders.

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