CN216409454U - Fresh-keeping device and refrigerator - Google Patents

Abstract

The utility model discloses a fresh-keeping device and a refrigerator with the fresh-keeping device, wherein the fresh-keeping device comprises an inner barrel and a shell, the shell is sleeved outside the inner barrel, an air duct is arranged between the shell and the inner barrel, the air duct comprises a refrigerating channel, and the refrigerating channel surrounds the periphery of the inner barrel. The outer wall of the inner barrel is cooled by the arrangement of the refrigeration channels surrounding the periphery of the inner barrel. The cold air can cool the periphery of the inner barrel, and the temperature uniformity of the inner barrel is improved. In the whole process, no cold air enters the inner space of the inner barrel, the whole cooling process carries out heat conduction through the outer wall of the inner barrel, the temperature fluctuation inside the inner barrel is very small, and the constant temperature control is realized.

Description

Fresh-keeping device and refrigerator

Technical Field

The utility model relates to the technical field of preservation, in particular to a preservation device and a refrigerator.

Background

The technology of keeping fresh is the auxiliary means that increases on the basis of temperature and humidity, can increase the fresh-keeping of fruit vegetables to a certain extent, but to the storage space of temperature fluctuation, fresh-keeping effect is not too good. Because the fluctuation of the temperature drives the respiration and transpiration of the vegetables, the larger the fluctuation of the temperature is, the more serious the water loss of the vegetables is.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides a fresh-keeping device which can reduce temperature fluctuation.

The utility model also provides a refrigerator with the fresh-keeping device.

The fresh-keeping device comprises an inner barrel and a shell, wherein the shell is sleeved outside the inner barrel, an air duct is arranged between the shell and the inner barrel, and the air duct comprises a refrigerating channel which surrounds the periphery of the inner barrel.

The fresh-keeping device provided by the embodiment of the utility model at least has the following beneficial effects: the outer wall of the inner barrel is cooled by the arrangement of the refrigeration channels surrounding the periphery of the inner barrel. The cold air can cool the periphery of the inner barrel, and the temperature uniformity of the inner barrel is improved. In the whole process, no cold air enters the inner space of the inner barrel, the whole cooling process carries out heat conduction through the outer wall of the inner barrel, the temperature fluctuation inside the inner barrel is very small, and the constant temperature control is realized.

According to some embodiments of the present invention, the cold passage includes a first main passage at a top surface of the inner tub and a plurality of first branch passages extending toward a side surface of the inner tub.

According to some embodiments of the present invention, the first main passage is located at a middle portion of a top surface of the inner tub, and the plurality of first branch passages are all disposed at both sides of the first main passage.

According to some embodiments of the present invention, the air duct includes an air inlet passage communicating with the first main duct, the air inlet passage being located at an end side of the inner tub.

According to some embodiments of the present invention, the cooling passage includes a second main passage at a bottom surface of the inner tub and a plurality of second branch passages extending toward a side surface of the inner tub.

According to some embodiments of the present invention, the second main passage is located at a middle portion of a bottom surface of the inner tub, and the plurality of second branch passages are uniformly arranged at both sides of the second main passage.

According to some embodiments of the present invention, the duct includes a return air passage communicating with the second main duct, the return air passage being located at an end side of the inner tub.

According to some embodiments of the present invention, the refreshing device further comprises a foam member positioned between the outer casing and the inner tub, the foam member being provided with a groove defining the air duct with the inner tub.

According to some embodiments of the present invention, the top surface of the inner tub is provided with a concave-convex structure for increasing a heat exchange area.

According to some embodiments of the utility model, the rugged structure comprises a diamond face having convex points facing a bottom surface of the inner barrel.

The refrigerator according to the second aspect embodiment of the utility model comprises the freshness keeping device of the first aspect embodiment of the utility model.

According to the refrigerator provided by the embodiment of the utility model, at least the following beneficial effects are achieved: the outer wall of the inner barrel is cooled by the arrangement of the refrigeration channels surrounding the periphery of the inner barrel. The cold air can cool the periphery of the inner barrel, and the temperature uniformity of the inner barrel is improved. In the whole process, no cold air enters the inner space of the inner barrel, the whole cooling process is carried out through the heat conduction of the outer wall, the temperature fluctuation in the inner barrel is very small, and the constant temperature control is realized.

Additional aspects and advantages of the utility model 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 utility model.

Drawings

The utility model is further described with reference to the following figures and examples, in which:

FIG. 1 is a cross-sectional view of a preservation apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic view of the arrangement of the air duct on the inner barrel according to the embodiment of the present invention;

FIG. 3 is a schematic view from the front of the foam part shown in FIG. 1;

FIG. 4 is a schematic view from the back of the foam part shown in FIG. 3;

FIG. 5 is a schematic view of the foam part shown in FIG. 3 with the top surface removed;

FIG. 6 is another schematic view of the foam part shown in FIG. 3 with the top surface removed;

FIG. 7 is a schematic view of the crisper device shown in FIG. 1 with the drawer removed;

FIG. 8 is a schematic view from above of the top plate shown in FIG. 7;

fig. 9 is a schematic view from below of the top plate shown in fig. 7.

Reference numerals:

101. an inner barrel; 102. a foam member; 103. a housing; 104. a drawer;

201. an air inlet channel; 202. an air return channel; 203. a refrigeration channel; 204. a first trunk road; 205. a first branch road; 206. a connecting channel;

301. a groove;

401. an air inlet; 402. an air return opening;

501. a second trunk road; 502. a second branch road;

701. an opening; 702. a top plate; 703. a relief structure;

801. a diamond surface; 802. and (4) bumps.

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 or similar 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 accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, 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, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.

The refrigerator is a household appliance frequently used in daily life of people, and the refrigerator in the house of a conventional user has the functions of refrigeration and freezing. With the acceleration of life rhythm, more and more users like to accumulate certain food materials to meet the long-time life demand, and the preservation of fruits and vegetables is a constant topic all the time. With the development of technology, the preservation means of the existing refrigerator are more abundant, such as the technology of humidity conditioning space, low oxygen space and the like.

In the related art, the principle of the air-cooled refrigerator is that air is used for cooling, when high-temperature air flows through a built-in evaporator (separated from the inner wall of the refrigerator), the air temperature is reduced and cold air is formed because the air temperature is high and the evaporator temperature is low and the air and the evaporator directly exchange heat. Meanwhile, the refrigerating chamber is provided with a through hole, and an air door is arranged at the through hole, so that cold air can be conveyed into the refrigerating chamber through the air door, and cold air is blown into the refrigerating chamber; because the air door is provided with the control device, and the temperature sensor connected with the air door is arranged in the refrigerating chamber, the opening and closing of the air door can be controlled through the sensor, and cold air is intermittently conveyed to the refrigerating chamber, so that the temperature in the refrigerating chamber is kept within a certain range.

To the drawer structure, air conditioning passes through the wind gap and gets into inside the drawer, carries out inside cooling and accuse temperature to the drawer through the cold wind circulation, and the cold wind that newly gets into will be lower than the inside air temperature of drawer, and this kind of accuse temperature means is because the entering of cold wind can arouse the fluctuation of temperature certainly, because the fluctuation of temperature drives the breathing and the transpiration of vegetables, and temperature fluctuation is big more, and vegetables are the more serious dehydration, so fresh-keeping effect is not too good. Therefore, this temperature control method cannot be used for a space requiring sealing.

In the related art, there is a scheme of attaching evaporators to both sides of an inner casing corresponding to an upper side and both side surfaces of a storage space. The evaporator performs a heat exchange between the refrigerant flowing inside and the air inside the storage space. But this scheme is higher cost to easily frost in the storage space, frostbite fruit vegetables, influence fresh-keeping effect, also increase power consumption simultaneously, can reduce the usage space of refrigerator. Therefore, this solution also leaves room for improvement.

With reference to fig. 1 to 9, how the freshness retaining device according to the embodiment of the present invention solves the above problem will be described.

Referring to fig. 1, it can be understood that the freshness protection device according to the embodiment of the present invention includes an inner barrel 101, a foam member 102, and a housing 103, wherein the foam member 102 is disposed on an outer sidewall of the inner barrel 101, and the housing 103 is disposed on an outer sidewall of the foam member 102, i.e., the foam member 102 is located between the inner barrel 101 and the housing 103.

Referring to fig. 7, it can be understood that the inner tub 101 is provided with a storage space, and an opening 701 is also provided, the opening 701 being located at a front end surface of the inner tub 101, the opening 701 communicating with the storage space. Referring to fig. 1, it can be understood that the preservation apparatus further includes a drawer 104, the drawer 104 enters the storage space through an opening 701, and the drawer 104 can be accommodated in the storage space, while a panel of the drawer 104 closes the opening 701 to form a closed storage space.

It should be noted that the drawer 104 may also be replaced by a door body, and the door body is disposed at the opening 701 of the inner barrel 101 and is used for closing or opening the opening 701.

Referring to fig. 2, it can be understood that an air duct is disposed outside the inner barrel 101, the air duct includes an air inlet channel 201, a cooling channel 203 and a return air channel 202, the cooling channel 203 surrounds the inner barrel 101, and cold air enters from the air inlet channel 201 and then flows through the cooling channel 203 to cool the outer wall of the inner barrel 101. Because the refrigeration channel 203 is tightly attached to the four peripheral walls of the inner barrel 101, the cold air can exchange heat with the peripheral side of the inner barrel 101, and the temperature uniformity of the inner barrel 101 is improved. The cold air finally flows out from the air return channel 202, and cold air circulation is realized.

In the whole process, no cold air enters the inner space of the inner barrel 101, the whole cooling process carries out heat conduction through the outer wall of the inner barrel 101, the temperature fluctuation inside the inner barrel 101 is very small, and the constant temperature control is realized. The fluctuation of the degree is small, the transpiration of the vegetables is reduced, so that the moisture is kept more favorably, and the fresh-keeping period of the vegetables is prolonged.

Referring to fig. 2, it can be understood that the cooling passage 203 includes a first main passage 204 and a plurality of first branch passages 205, the first main passage 204 and the plurality of first branch passages 205 are located on the top surface of the inner tub 101, and the air inlet passage 201 delivers cool air to the first main passage 204 and then flows toward each of the first branch passages 205, thereby making the distribution of the cool air on the top surface of the inner tub 101 more uniform, improving the uniformity of the temperature of the inner tub 101, and reducing the temperature fluctuation inside the inner tub 101.

Referring to fig. 2, it can be understood that the first main duct 204 is disposed in a front-rear direction, the first branch duct 205 is disposed in a left-right direction, the air inlet passage 201 delivers cool air to the first main duct 204 at a rear end of the inner tub 101, the cool air flows to a front end of the inner tub 101 along the first main duct 204, and at the same time, when the cool air flows through a junction of the first main duct 204 and the first branch duct 205, a part of the cool air is also branched to the first branch duct 205, thereby changing a flow direction, i.e., spreading in the left-right direction and flowing toward a side surface of the inner tub 101.

Referring to fig. 2, it can be appreciated that the first main channel 204 is located in the middle of the inner tub 101, the plurality of first branch channels 205 are divided into two parts, one part of the first branch channels 205 is disposed at the left side of the first main channel 204, the other part of the first branch channels 205 is disposed at the right side of the first main channel 204, the first branch channels 205 located at the left side of the first main channel 204 extend toward the left side of the inner tub 101, and the first branch channels 205 located at the right side of the first main channel 204 extend toward the right side of the inner tub 101.

It should be noted that the first main channel 204 may also be located at one side of the inner tub 101, and the plurality of first branch channels 205 extend from the first main channel 204 to the other side of the inner tub 101. For example, the first main duct 204 is located at the left side of the inner tub 101, and the plurality of first branches 205 extend from the left side of the inner tub 101 to the right side of the inner tub 101. However, this scheme has a disadvantage in that the cool air is more easily concentrated at the left side of the inner tub 101 than at the right side of the inner tub 101, resulting in a lower temperature at the left side of the inner tub 101 than at the right side of the inner tub 101. Therefore, the advantage of disposing the first main duct 204 in the middle of the inner tub 101 and disposing the plurality of first branch ducts 205 on both sides of the first main duct 204 is that the cool air can be distributed more uniformly, thereby improving the uniformity of the temperature of the inner tub 101 without causing one side of the inner tub 101 to have a lower temperature than the other side.

It should be noted that the first main duct 204 and the plurality of first branch ducts 205 may be arranged obliquely and may also extend in a wavy manner, in addition to extending linearly.

Referring to fig. 2, it can be understood that the refrigerating passage 203 further includes a connection passage 206, the connection passage 206 is disposed in an up-down direction, the connection passage 206 is located at a side of the inner tub 101, and the first branch passage 205 has one end connected to the first main passage 204 and the other end connected to the connection passage 206. The air inlet channel 201 conveys cold air to the first main channel 204 at the rear end of the inner barrel 101, the cold air flows to the front end of the inner barrel 101 along the first main channel 204, meanwhile, when the cold air flows through the junction of the first main channel 204 and the first branch channel 205, part of the cold air is also divided to the first branch channel 205, so that the flowing direction is changed, namely the cold air is dispersed along the left-right direction and flows towards the connecting channel 206, and heat exchange between the cold air and the inner barrel 101 at the side surface of the inner barrel 101 is realized.

Referring to fig. 2, it can be understood that the air inlet channel 201 is located at the rear end surface of the inner barrel 101, and the cool air firstly passes through the air inlet channel 201 and then flows through the cooling channel 203, that is, the cool air can cool the rear end surface of the inner barrel 101 when flowing through the air inlet channel 201. Therefore, the cold air can cool five surfaces of the inner barrel 101, and the temperature uniformity of the inner barrel 101 is improved.

Referring to fig. 2, it can be understood that the return air channel 202 is located at the rear end surface of the inner barrel 101, and the cold air firstly passes through the air inlet channel 201, then passes through the refrigeration channel 203, and finally flows out through the return air channel 202, that is, the cold air can cool the rear end surface of the inner barrel 101 when passing through the return air channel 202. The air inlet channel 201 and the air return channel 202 are both positioned on the rear end face of the inner barrel 101, so that the heat exchange effect on the rear end face of the inner barrel 101 can be enhanced.

Referring to fig. 2, it can be appreciated that the air intake channel 201 is located above the return air channel 202, and the cooling channel 203 is also configured to allow cool air to flow from the top surface of the inner tub 101 to the bottom surface of the inner tub 101. Because the cold air is heavier, sinks easily, consequently, through above-mentioned setting, can make cold wind diffuse more easily, improves heat exchange efficiency to reduce cold wind and gather in the bottom surface of interior bucket 101, and the less possibility of top surface cold wind of interior bucket 101.

It should be noted that, the refrigeration channel 203 may have only one channel, for example, the refrigeration channel 203 is arranged in an S shape, and the effect of uniformly distributing the cold air and further improving the uniformity of the temperature of the inner barrel 101 can also be achieved. The S-shaped arrangement of the refrigeration channels 203 has the disadvantages of being complex to manufacture, having large turns for the airflow to pass through, receiving large resistance, causing capacity loss, and having a large temperature difference between the air inlet end and the air return end. That is, the scheme that the refrigeration channel 203 comprises the first main channel 204 and the plurality of first branch channels 205 can improve the uniformity of the temperature of the inner barrel 101, reduce the manufacturing difficulty, reduce the loss of the air flow and reduce the temperature difference between the air inlet end and the air return end.

Referring to fig. 3, it can be understood that the foam member 102 is provided with a groove 301, an opening of the groove 301 faces the inner barrel 101, and when the foam member 102 is sleeved on the inner barrel 101, an outer surface of the inner barrel 101 closes the opening of the groove 301 to form a structure with a closed cross section, that is, the groove 301 and the inner barrel 101 jointly define an air outlet channel.

It should be noted that, in other embodiments, the foam member 102 may further be provided with a complete air duct, the air duct is located on a side of the foam member 102 facing the inner barrel 101, and a thin wall of the foam member 102 is located between the air duct and the outer surface of the inner barrel 101, so that the inner barrel 101 may be cooled. And adopt the scheme advantage of recess 301 and interior bucket 101 injecing the exhaust passage jointly, cold wind can be directly with the surface contact of interior bucket 101, and the cooling rate is faster, also can reduce the energy consumption simultaneously.

Referring to fig. 4, it can be understood that the foam member 102 is further provided with an intake vent 401 and a return vent 402, the intake vent 401 is communicated with the intake air passage 201, the return vent 402 is communicated with the return air passage 202, and the intake vent 401 is located above the return vent 402.

It should be noted that in some embodiments, the foam member 102 may be eliminated, that is, the air duct is formed directly by the cooperation of the inner barrel 101 and the outer casing 103. For example, an air duct is provided directly inside the housing 103; or the shell 103 is provided with a semicircular through groove, the outer surface of the inner barrel 101 is also provided with a semicircular through groove, and the two semicircular barrel grooves are mutually matched to form an air duct with a circular section; or a square through groove is arranged on the shell 103, and the square through groove and the outer surface of the inner barrel 101 are matched with each other to form an air duct with a square section. The use of the foam member 102 has the advantages of easier manufacture, lower cost, and a certain thermal insulation effect, and reduced energy loss.

Referring to fig. 3, 5 and 6, it can be understood that the cooling channel 203 further includes a second main channel 501 and a plurality of second branch channels 502, the second main channel 501 and the plurality of second branch channels 502 are located on the bottom surface of the inner tub 101, one end of each second branch channel 502 is communicated with the connecting channel 206, the other end is communicated with the second main channel 501, the second main channel 501 is communicated with the return air channel 202, the return air channel 201 delivers cold air to the first main channel 204, and then flows to each first branch channel 205, and then flows to the second branch channels 502 through the connecting channel 206, and the cold air in the plurality of second branch channels 502 is collected to the second main channel 501 and finally flows out from the return air channel 202 to complete cold air circulation, so that the cold air is more uniformly distributed on the circumferential surface of the inner tub 101, the uniformity of the temperature of the inner tub 101 is improved, and the temperature fluctuation inside the inner tub 101 is reduced.

Referring to fig. 3, 5 and 6, it can be understood that the second main duct 501 is arranged in a front-rear direction, the second branch duct 502 is arranged in a left-right direction, the second main duct 501 is located at the middle of the inner tub 101, the plurality of second branch ducts 502 are divided into two parts, one part of the second branch ducts 502 is disposed at the left side of the second main duct 501, the other part of the second branch ducts 502 is disposed at the right side of the second main duct 501, the second branch duct 502 located at the left side of the second main duct 501 extends toward the left side of the inner tub 101, and the second branch duct 502 located at the right side of the second main duct 501 extends toward the right side of the inner tub 101.

It should be noted that the second main channel 501 may also be located at one side of the inner tub 101, and the plurality of second branch channels 502 extend from the second main channel 501 to the other side of the inner tub 101. For example, the second main duct 501 is located at the left side of the inner tub 101, and the plurality of second branch ducts 502 extend from the left side of the inner tub 101 to the right side of the inner tub 101. However, this scheme has a disadvantage in that the cool air is more easily concentrated at the left side of the inner tub 101 than at the right side of the inner tub 101, resulting in a lower temperature at the left side of the inner tub 101 than at the right side of the inner tub 101. Therefore, the second main duct 501 is disposed in the middle of the inner tub 101, and the plurality of second branch ducts 502 are respectively disposed at both sides of the second main duct 501, which is advantageous in that the cool air can be distributed more uniformly, thereby improving the uniformity of the temperature of the inner tub 101 without causing one side of the inner tub 101 to have a lower temperature than the other side.

It should be noted that the second main road 501 and the plurality of second branch roads 502 may be arranged obliquely and may also extend in a wavy manner, in addition to extending linearly.

Referring to fig. 7, it can be understood that the inner tub 101 includes a top plate 702, the top plate 702 is provided with a concave-convex structure 703, and the concave-convex structure 703 increases a surface area with respect to a planar structure, so that a contact area with cold wind can be increased. Therefore, by arranging the concave-convex structure 703, the concave-convex structure 703 is matched with the air duct, and the heat exchange efficiency can be improved.

It can be understood that the top plate 702 can be provided with the sealing rings all around, and the sealing rings are arranged between the top plate 702 and the four side plates of the inner barrel 101, so that the inner barrel 101 can be sealed, and the overall sealing performance is improved.

Referring to fig. 8 and 9, it is understood that the concave-convex structure 703 may be configured as a diamond surface 801, and the diamond surface 801 may be configured as a convex portion on a side facing the bottom surface of the inner barrel 101 and a concave portion on a side close to the foam member 102, i.e., the diamond surface 801 is configured as a structure with a plurality of inner convex portions and outer concave portions, and the diamond surface 801 is defined by a plurality of triangular or diamond-shaped surfaces, which are connected to form a lowest point, which is a convex point 802 of the diamond surface 801, and the convex point 802 faces the bottom surface of the inner barrel 101.

Because the transpiration of vegetables, the moisture of production can collect on roof 702, and diamond face 801 is protruding downwards, and moisture can collect diamond face 801 on, can have the function of secondary humidification to the edible material in interior bucket 101, has guaranteed that the inner space has certain humidity, more is favorable to the fruit vegetables fresh-keeping.

The concave-convex structure 703 may have a tapered surface, a spherical surface, or the like.

The top plate 702 may be integrally formed with other side plates and the bottom plate. The top plate 702 and the other side plates are of a split structure, so that the concave-convex structure 703 on the top plate 702 is convenient to manufacture, and the manufacturing difficulty is reduced.

The fresh-keeping device of the embodiment of the utility model can control the temperature of the sealed drawer 104 space, and the temperature fluctuation is +/-1 degree, thereby realizing the constant temperature control of the sealed space and having important function and significance for the fresh-keeping of fruits and vegetables. Meanwhile, the top surface of the inner barrel 101 is provided with a diamond surface 801, which plays an important role in maintaining the humidity in the space.

The refrigerator provided by the embodiment of the utility model comprises the fresh-keeping device provided by the embodiment of the utility model, and has all the advantages due to all the technical characteristics of the fresh-keeping device, and the detailed description is omitted.

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 within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims (11)

1. Fresh-keeping device, its characterized in that includes:

an inner barrel;

the shell is sleeved on the outer side of the inner barrel, an air duct is arranged between the shell and the inner barrel, the air duct comprises a refrigeration channel, and the refrigeration channel surrounds the periphery of the inner barrel.

2. The freshness keeping device of claim 1, wherein the cooling passage comprises a first main passage and a plurality of first branch passages at a top surface of the inner barrel, the first branch passages extending toward a side surface of the inner barrel.

3. The freshness keeping device according to claim 2, wherein the first main duct is located at a middle portion of a top surface of the inner barrel, and the plurality of first branch ducts are disposed at both sides of the first main duct.

4. The freshness keeping device according to claim 2, wherein the air duct includes an air inlet passage communicating with the first main duct, the air inlet passage being located at an end side of the inner tub.

5. The freshness keeping device of claim 1, wherein the cooling passage comprises a second main passage at a bottom surface of the inner tub and a plurality of second branch passages extending toward a side surface of the inner tub.

6. The freshness keeping device according to claim 5, wherein the second main channel is located at a middle portion of a bottom surface of the inner barrel, and the plurality of second branch channels are uniformly arranged at both sides of the second main channel.

7. The freshness retaining device of claim 5, wherein the air duct includes a return air passage communicating with the second main duct, the return air passage being located at an end side of the inner tub.

8. The freshness device according to any one of claims 2 to 7, further comprising a foam member located between the outer casing and the inner barrel, the foam member being provided with a groove defining the air duct with the inner barrel.

9. The freshness keeping device according to claim 1, wherein the top surface of the inner barrel is provided with a concave-convex structure for increasing a heat exchange area.

10. The freshness retaining device of claim 9, wherein the concavo-convex structure includes a diamond surface having convex points facing a bottom surface of the inner barrel.

11. Refrigerator characterized in that it comprises a freshness retaining device according to any one of claims 1 to 10.

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