Refrigerator

Abstract

The utility model relates to a refrigerator, which belongs to the technical field of refrigeration equipment and comprises a box body, a mounting box, a compressor, an evaporator, a first return air inlet, a fan and an air outlet. Wherein the top of the box body is opened; the mounting box is arranged on the inner bottom wall of the box body; the compressor is arranged in the box body; the evaporator is arranged in the mounting box and is connected with the compressor; the first return air inlet is formed in one end of the top of the mounting box; the upper surface of the mounting box inclines towards one side away from the first air return port from top to bottom; the fan is arranged in the box body; the air outlet is formed in the box body; under the action of the fan, air in the box body enters the mounting box through the first return air inlet, the air entering the mounting box is output through the air outlet after being subjected to heat exchange by the evaporator when passing through the evaporator, and when an article is placed above the mounting box, the article can slide to the side away from the first return air inlet on the upper surface of the mounting box under the action of gravity.

Description

Technical Field

[0001] The present application relates to the technical field of refrigeration equipment, and in particular to a refrigerator. Background Art

[0002] A freezer is a household or commercial appliance used to refrigerate or freeze food and items. It usually uses refrigeration technology to keep the temperature at a lower level to keep the food fresh and extend its shelf life.

[0003] In the prior art, the refrigerator comprises a box body, an installation box is arranged inside the box body, an evaporator is arranged in the installation box, and a return air outlet is opened on the installation box.

[0004] However, in the prior art, the return air vent is arranged above the installation box. When goods are placed in the box, the goods will cover the return air vent, affecting the return air effect, thereby reducing the air volume exchanged by the evaporator, and further affecting the overall refrigeration effect of the refrigerator. Utility Model Content

[0005] The utility model solves one of the technical problems in the related art at least to a certain extent.

[0006] To this end, the present application aims to provide a refrigerator, when an item is placed on the installation box, the item will slide on the upper surface of the installation box to a side away from the first return air outlet under the action of gravity, so as to avoid the item covering the first return air outlet and affecting the return air effect of the first return air outlet. The return air effect is ensured, thereby improving the refrigeration effect of the refrigerator.

[0007] In order to achieve the above object, the utility model provides a refrigerator, comprising:

[0008] A box body, wherein the top of the box body is open;

[0009] An installation box, the installation box is arranged on the inner bottom wall of the box body;

[0010] A compressor, wherein the compressor is arranged in the box;

[0011] an evaporator, the evaporator being arranged inside the installation box and connected to the compressor;

[0012] A first air return port, the first air return port being opened at one end of the top of the installation box;

[0013] The upper surface of the installation box is inclined from top to bottom toward a side away from the first return air outlet;

[0014] A fan, wherein the fan is arranged in the box;

[0015] An air outlet, the air outlet being arranged in the box;

[0016] Under the action of the fan, the air in the box body enters the installation box through the first return air port. The air entering the installation box is heated by the evaporator when passing through the evaporator and then output through the air outlet.

[0017] In the technical solution, when an item is placed on the installation box, the item will slide on the upper surface of the installation box to the side away from the first return air outlet under the action of gravity, so as to avoid the item covering the first return air outlet and affecting the return air effect of the first return air outlet. The return air effect is ensured, thereby improving the refrigeration effect of the refrigerator.

[0018] In addition, the present application also provides a refrigerator, which includes:

[0019] A box body, wherein the top of the box body is open;

[0020] An installation box, the installation box is arranged on the inner bottom wall of the box body;

[0021] A compressor, wherein the compressor is arranged in the box;

[0022] an evaporator, the evaporator being arranged inside the installation box and connected to the compressor;

[0023] A first air return port, the first air return port being opened at one end of the top of the installation box;

[0024] The upper surface of the installation box is inclined from the side away from the first return air outlet toward the bottom wall of the box body;

[0025] A fan, wherein the fan is arranged in the box;

[0026] An air outlet, the air outlet being arranged in the box;

[0027] Under the action of the fan, the air in the box body enters the installation box through the first return air port. The air entering the installation box is heated by the evaporator when passing through the evaporator and then output through the air outlet.

[0028] In the technical solution, when an item is placed on the installation box, the item will slide on the upper surface of the installation box to the side away from the first return air outlet under the action of gravity, so as to avoid the item covering the first return air outlet and affecting the return air effect of the first return air outlet. The return air effect is ensured, thereby improving the refrigeration effect of the refrigerator.

[0029] In some embodiments of the present application, a return air portion is protruded upward from the top of the box body, and the first return air outlet is opened on the side wall of the first return air outlet.

[0030] In the technical solution, since the return air portion is protruding, it is prevented that the first return air port is covered when the object is placed on the installation box. Even when the object is placed above the return air portion, since the return air portion is protruding, the bottom of the object will be lifted up to form a space for air flow, so that the air can enter the installation box through the first return air port.

[0031] In some embodiments of the present application, the first return air outlet is opened on two opposite side walls of the return air portion.

[0032] In the technical solution, air can enter the installation box through the return air ports on both sides of the return air portion. Even if one side of the return air portion is blocked, air can be returned through the first return air port on the other side of the return air portion, further preventing objects from covering the first return air port and affecting the return air effect of the first return air port. The return air effect is ensured, thereby improving the refrigeration effect of the freezer.

[0033] In some embodiments of the present application, the height direction of the return air portion is perpendicular to the top wall of the installation box.

[0034] In the technical solution, the molding and manufacturing of the return air part is facilitated.

[0035] In some embodiments of the present application, the height direction of the return air portion is arranged along the height direction of the box body.

[0036] In the technical solution, dust or debris is reduced from falling directly from above into the first return air inlet, the probability of dust and debris entering the installation box is reduced, and the service life of the evaporator is increased.

[0037] In some embodiments of the present application, the length direction of the return air portion is perpendicular to the length direction of the installation box; and a plurality of return air portions are arranged at intervals along the length direction of the installation box.

[0038] In the technical solution, multiple air return parts are provided so that when an object is placed above the air return parts, it will be lifted up by the multiple air return parts so that there is space for air to flow under the object. In addition, the number of first air return ports is increased to improve the air return efficiency.

[0039] In some embodiments of the present application, a second return air outlet is provided on the vertical side wall of the installation box.

[0040] In the technical solution, the return air efficiency is improved. Even if the first return air inlet is blocked, air can enter the installation box through the second return air inlet, thereby avoiding damage to the heat exchanger due to lack of air flowing through the heat exchanger.

[0041] In some embodiments of the present application, the second return air outlet is arranged on an end of the side wall corresponding to the installation box close to the first return air outlet.

[0042] In the technical solution, the airflow passing through the air outlet is prevented from being immediately sucked in from the first return air outlet and the second return air outlet, ensuring that the cold air passing through the air outlet can fully cool the inside of the refrigerator before flowing back into the installation through the first return air outlet and the second return air outlet. In this way, the effects of surrounding wind and circulating wind are achieved, and the cooling effect is improved.

[0043] In some embodiments of the present application, a ventilation shell is further provided in the box body, and the ventilation shell is provided at one end of the installation box away from the first return air outlet; the air outlet is opened in the ventilation shell;

[0044] The evaporator has an output section and an input end, the return air port is close to the input end of the evaporator, and the ventilation shell is close to the output end of the evaporator.

[0045] In the technical solution, air enters the installation box through the return air port, and the air moves along the evaporator under the action of the fan, and the air is cooled when passing through the evaporator. The cold air moves to the output end of the evaporator and is output through the air outlet. The contact area and duration between the air and the evaporator are increased.

[0046] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 is a schematic diagram of the overall structure of a refrigerator according to an embodiment of the present application;

[0048] Figure 2 is a top view of a refrigerator according to an embodiment of the present application;

[0049] Figure 3 is a front view of a refrigerator according to an embodiment of the present application;

[0050] Figure 4 yes Figure 3 Sectional view in the AA direction;

[0051] Figure 5 is a schematic diagram of the internal structure of a refrigerator according to an embodiment of the present application;

[0052] Figure 6 is a front view of the internal structure of the refrigerator according to the embodiment of the present application;

[0053] Figure 7 is a schematic structural diagram of an installation box of a refrigerator according to an embodiment of the present application;

[0054] Figure 8 is a front view of an installation box of a refrigerator according to an embodiment of the present application;

[0055] Fig. 9 is a front view of an installation box of a refrigerator according to an embodiment of the present application;

[0056] Fig.10 It is a front view of the installation box of the refrigerator according to the embodiment of the present application.

[0057] In the above figures: 100, box body; 400, installation box; 4011, return air section; 40111, first return air outlet; 4012, second return air outlet; 500, ventilation shell. DETAILED DESCRIPTION

[0058] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0059] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0061] In the present utility model, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0062] The present invention is described in detail below by way of exemplary embodiments. However, it should be understood that, without further description, elements, structures and features in one embodiment may also be beneficially combined in other embodiments.

[0063] In the present application, the refrigerator includes a box body, a door body and a refrigeration system: the box body is usually made of metal or plastic and has certain heat preservation performance. A refrigeration chamber or a freezer chamber is arranged inside the box body. The door body is used to open and close the refrigerator. The refrigeration system includes a compressor, a condenser, an evaporator and a refrigerant, etc. The heat inside the refrigerator is transferred to the outside, thereby achieving a cooling effect.

[0064] Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0065] Please refer to all the drawings. In an illustrative embodiment of the refrigerator of the present invention, the refrigerator includes: a box body 100, an installation box 400, a compressor, an evaporator, a first return air port 40111, a fan and an air outlet; wherein the top of the box body 100 is open.

[0066] The installation box 400 is disposed on the inner bottom wall of the box body 100 .

[0067] The compressor is disposed in the housing 100 .

[0068] The evaporator is disposed inside the installation box 400, and the evaporator is connected to the compressor.

[0069] The first air return port 40111 is opened at one end of the top of the installation box 400 .

[0070] The upper surface of the installation box 400 is inclined from top to bottom toward a side away from the first return air outlet 40111 .

[0071] The fan is disposed in the box 100 .

[0072] The air outlet is disposed in the box body 100 .

[0073] Under the action of the fan, the air in the box body 100 enters the installation box 400 through the first return air port 40111. The air entering the installation box 400 is heated by the evaporator when passing through the evaporator and then output through the air outlet.

[0074] Through the above solution, when an object is placed on the installation box 400, the object will slide on the upper surface of the installation box 400 to a side away from the first return air port 40111 under the action of gravity, so as to avoid the object covering the first return air port 40111 and affecting the return air effect of the first return air port 40111. The return air effect is ensured, thereby improving the refrigeration effect of the refrigerator.

[0075] In some embodiments, the box body 100 is rectangular, the installation box 400 is arranged in a rectangular shape, and the length direction of the installation box 400 is perpendicular to the length direction of the box body 100 .

[0076] In some embodiments, the length direction of the installation box 400 is arranged horizontally.

[0077] Please refer to all the drawings. In addition, the present application also provides a refrigerator, which includes: a box body 100, an installation box 400, a compressor, an evaporator, a first return air port 40111, a fan and an air outlet; wherein the top of the box body 100 is open.

[0078] The installation box 400 is disposed on the inner bottom wall of the box body 100 .

[0079] The compressor is disposed in the housing 100 .

[0080] The evaporator is disposed inside the installation box 400, and the evaporator is connected to the compressor.

[0081] The first air return port 40111 is opened at one end of the top of the installation box 400 .

[0082] The upper surface of the installation box 400 is inclined from the side away from the first return air outlet 40111 to the bottom wall of the box body 100 .

[0083] The fan is disposed in the box 100 .

[0084] The air outlet is disposed in the box body 100 .

[0085] Under the action of the fan, the air in the box body 100 enters the installation box 400 through the first return air port 40111. The air entering the installation box 400 is heated by the evaporator when passing through the evaporator and then output through the air outlet.

[0086] Through the above solution, when an object is placed on the installation box 400, the object will slide on the upper surface of the installation box 400 to a side away from the first return air port 40111 under the action of gravity, so as to avoid the object covering the first return air port 40111 and affecting the return air effect of the first return air port 40111. The return air effect is ensured, thereby improving the refrigeration effect of the refrigerator.

[0087] In some embodiments, the box body 100 is rectangular, the installation box 400 is arranged in a rectangular shape, and the length direction of the installation box 400 is perpendicular to the length direction of the box body 100 .

[0088] In some embodiments, the two sides of the box body 100 in the width direction are the front side and the rear side of the box body 100 respectively.

[0089] In some embodiments, the length direction of the installation box 400 is arranged horizontally.

[0090] In some embodiments, two ends of the installation box 400 in the length direction are respectively connected to two inner side walls of the box body 100 in the width direction.

[0091] In some embodiments, the inclined direction of the upper surface of the installation is the length direction of the upper surface of the installation box 400. The length direction of the upper surface of the installation box 400 is intersected with the length direction of the installation box 400.

[0092] In some embodiments, a plurality of first return air vents 40111 are provided on the upper surface of the installation box 400 .

[0093] In some embodiments, the opening direction of the first return air outlet 40111 is the return air direction of the first return air outlet 40111 .

[0094] In some embodiments, the return air direction of the first return air outlet 40111 is perpendicular to the upper surface of the installation box 400 .

[0095] In some embodiments, the return air direction of the first return air outlet 40111 is set along the height direction of the box body 100.

[0096] In some embodiments, the first return air vent 40111 is disposed on an upper surface of the installation box 400 at one end close to the front side of the box body 100 .

[0097] In some embodiments, the first return air vent 40111 is disposed on an upper surface of the installation box 400 at one end close to the rear side of the box body 100 .

[0098] In some embodiments, a return air portion 4011 protrudes upward from the top of the box body 100 , and a first return air port 40111 is opened on a side wall of the first return air port 40111 .

[0099] Because the return air portion 4011 is protruding, it is prevented from covering the first return air port 40111 when objects are placed on the installation box 400 .

[0100] Even when an object is placed above the return air portion 4011 , because the return air portion 4011 is protruding, the bottom of the object will be lifted up to form a space for air flow, thereby allowing air to enter the installation box 400 through the first return air port 40111 .

[0101] In some embodiments, the return air portion 4011 is arranged in a long strip shape.

[0102] In some embodiments, the first return air port 40111 is opened at one end of the return air portion 4011 in the length direction.

[0103] In some embodiments, the first return air inlet 40111 is opened at both ends of the return air portion 4011 in the length direction.

[0104] In some embodiments, the first return air port 40111 is opened on one side of the return air portion 4011 in the width direction.

[0105] In some embodiments, the first return air ports 40111 are opened on both sides of the return air portion 4011 in the width direction.

[0106] In some embodiments, the first return air port 40111 is opened on two opposite side walls of the return air portion 4011 .

[0107] In some embodiments, the length direction of the return air portion 4011 is arranged along the length direction of the upper surface of the box body 100 .

[0108] In some embodiments, the length direction of the return air portion 4011 is perpendicular to the length direction of the installation box 400 .

[0109] In some embodiments, the length direction of the return air portion 4011 is the same as the length direction of the box body 100 .

[0110] Air can enter the installation box 400 through the return air ports on both sides of the return air portion 4011. Even if one side of the return air portion 4011 is blocked, air can be returned through the first return air port 40111 on the other side of the return air portion 4011, further preventing objects from covering the first return air port 40111 and affecting the return air effect of the first return air port 40111. The return air effect is ensured, thereby improving the refrigeration effect of the refrigerator.

[0111] In some embodiments, the height direction of the return air portion 4011 is perpendicular to the top wall of the installation box 400, so as to facilitate the molding and manufacturing of the return air portion 4011.

[0112] In some embodiments, when the height direction of the return air portion 4011 is perpendicular to the top wall of the installation box 400 , the opening direction of the first return air port 40111 is the same as the length direction of the upper surface of the installation box 400 .

[0113] In some embodiments, a plurality of first return air ports 40111 on the same return air portion 4011 are interconnected. When any first return air port 40111 is blocked, air can also be returned through the remaining first return air ports 40111.

[0114] In some embodiments, the height direction of the return air portion 4011 is arranged along the height direction of the box body 100. This reduces the possibility of dust or debris falling directly from above into the first return air port 40111, reduces the probability of dust and debris entering the installation box 400, and increases the service life of the evaporator.

[0115] In some embodiments, when the height direction of the return air portion 4011 is arranged along the height direction of the box body 100 , the opening direction of the first return air port 40111 is the same as the length direction of the installation box 400 .

[0116] In some embodiments, the height direction of the air return portion 4011 is the protruding direction of the air return portion 4011 on the upper surface of the installation box 400 .

[0117] In some embodiments, the air return portion 4011 is integrally formed with the upper surface of the installation box 400 .

[0118] In some embodiments, a plurality of return air portions 4011 are disposed at intervals along the width direction of the installation box 400 .

[0119] In some embodiments, a plurality of return air portions 4011 are provided at intervals along the length direction of the installation box 400. By providing a plurality of return air portions 4011, when an object is placed above the return air portion 4011, the plurality of return air portions 4011 are provided to lift the object so that there is space for air to flow under the object. In addition, the number of first return air ports 40111 is increased to improve the return air efficiency.

[0120] In some embodiments, the installation box 400 includes an installation box body and an installation box cover. The top of the installation box body is open, and the installation box cover is detachably arranged on the top of the installation box body, and the installation box cover is used to close the opening of the installation box body.

[0121] In some embodiments, the first return air vent 40111 is opened on the installation box cover.

[0122] In some embodiments, the return air portion 4011 is opened on the installation box cover.

[0123] In some embodiments, the return air portion 4011 is integrally formed with the installation box cover.

[0124] In some embodiments, the vertical side wall of the installation box 400 is provided with a second return air port 4012 to improve the return air efficiency. Even if the first return air port 40111 is blocked, air can enter the installation box 400 through the second return air port 4012 to avoid damage to the heat exchanger due to lack of air flowing through the heat exchanger.

[0125] In some embodiments, the second air return port 4012 is disposed on the corresponding side wall of the installation box 400, close to one end of the first air return port 40111. This prevents the airflow passing through the air outlet from being immediately sucked in from the first air return port 40111 and the second air return port 4012, and ensures that the cold air passing through the air outlet can fully cool the inside of the refrigerator before flowing back into the installation through the first air return port 40111 and the second air return port 4012. This achieves the effects of surrounding wind and circulating wind, and improves the cooling effect.

[0126] In some embodiments, the second air return port 4012 is arranged in a rectangular shape. The length direction of the second air return port 4012 is arranged along the height direction of the box body 100 .

[0127] In some embodiments, the length direction of the second air return port 4012 is arranged along the length direction of the cabinet 100 .

[0128] In some embodiments, a ventilation shell 500 is further disposed in the box body 100 , and the ventilation shell 500 is disposed at one end of the installation box 400 away from the first return air outlet 40111 ; an air outlet is opened in the ventilation shell 500 .

[0129] In some embodiments, the evaporator has an output section and an input end, the return air port is close to the input end of the evaporator, and the vent shell 500 is close to the output end of the evaporator.

[0130] The air enters the installation box 400 through the return air port, and the air moves along the evaporator under the action of the fan, and the air is cooled when passing through the evaporator, and the cold air moves to the output end of the evaporator and is output through the air outlet, thereby increasing the contact area and duration between the air and the evaporator.

[0131] In some embodiments, the inner bottom wall of the box body 100 is formed with a step upward, and the installation box 400 is attached to the side wall of the step. Through the formation of the step, the compressor can be accommodated under the step, which facilitates the overall layout of the box body 100.

[0132] In some embodiments, the step is located at one end of the length direction of the box body 100. The upper surface of the step is directly connected to the vertical side wall at one end of the length direction of the box body 100.

[0133] In some embodiments, the side of the installation box 400 close to the step is attached to the vertical side panel of the step.

[0134] In some embodiments, the second air return port 4012 is opened on a side of the installation box 400 that is vertical and away from the steps.

[0135] In some embodiments, the air outlet includes a first air outlet, and the first air outlet is opened on a vertical side wall of the ventilation shell 500.

[0136] In some embodiments, the first air outlet is opened on a side of the installation box 400 away from the first return air outlet 40111 .

[0137] In some embodiments, the first air outlet is opened on the upper surface of the installation box 400 .

[0138] In some embodiments, the first air outlet is opened on a vertical side of the installation box 400 .

[0139] In some embodiments, the angle between the upper surface of the installation box 400 and the inner bottom wall of the box body 100 is greater than 1°.

[0140] In some embodiments, the angle between the upper surface of the installation box 400 and the inner bottom wall of the box body 100 is less than 30°.

[0141] In some embodiments, the angle between the upper surface of the installation box 400 and the inner bottom wall of the box body 100 is 3°.

[0142] In some embodiments, the angle between the upper surface of the installation box 400 and the inner bottom wall of the box body 100 is 5°.

[0143] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A refrigerator, characterized in that: It includes: A box body, wherein the top of the box body is open; An installation box, the installation box is arranged on the inner bottom wall of the box body; A compressor, wherein the compressor is arranged in the box; an evaporator, the evaporator being arranged inside the installation box and connected to the compressor; A first air return port, the first air return port being opened at one end of the top of the installation box; The upper surface of the installation box is inclined from top to bottom toward a side away from the first return air outlet; A fan, wherein the fan is arranged in the box; An air outlet, the air outlet being arranged in the box; Under the action of the fan, the air in the box body enters the installation box through the first return air port. The air entering the installation box is heated by the evaporator when passing through the evaporator and then output through the air outlet.

2. A refrigerator, characterized in that: It includes: A box body, wherein the top of the box body is open; An installation box, the installation box is arranged on the inner bottom wall of the box body; A compressor, wherein the compressor is arranged in the box; an evaporator, the evaporator being arranged inside the installation box and connected to the compressor; A first air return port, the first air return port being opened at one end of the top of the installation box; The upper surface of the installation box is inclined from the side away from the first return air outlet toward the bottom wall of the box body; A fan, wherein the fan is arranged in the box; An air outlet, the air outlet being arranged in the box; Under the action of the fan, the air in the box body enters the installation box through the first return air port. The air entering the installation box is heated by the evaporator when passing through the evaporator and then output through the air outlet.

3. The refrigerator according to claim 1 or 2, characterized in that: The top of the box body is protruded upward to form an air return portion, and the first air return port is opened on the side wall of the first air return port.

4. The refrigerator according to claim 3, characterized in that: The first return air port is disposed on two opposite side walls of the return air portion.

5. The refrigerator according to claim 3, characterized in that: The height direction of the air return portion is perpendicular to the top wall of the installation box.

6. The refrigerator according to claim 3, characterized in that: The height direction of the air return portion is arranged along the height direction of the box body.

7. The refrigerator according to claim 3, characterized in that: The length direction of the air return portion is perpendicular to the length direction of the installation box; a plurality of air return portions are arranged at intervals along the length direction of the installation box.

8. The refrigerator according to claim 1 or 2, characterized in that: The vertical side wall of the installation box is provided with a second air return port.

9. The refrigerator according to claim 8, characterized in that: The second air return port is arranged on a side wall corresponding to the installation box and close to one end of the first air return port.

10. The refrigerator according to claim 1 or 2, characterized in that: A ventilation shell is also provided in the box body, and the ventilation shell is provided at one end of the installation box away from the first return air outlet; the air outlet is opened in the ventilation shell; The evaporator has an output section and an input end, the return air port is close to the input end of the evaporator, and the ventilation shell is close to the output end of the evaporator.

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