Refrigerating box and cold chain transport vehicle with refrigerating box

Abstract

The utility model discloses a refrigerated container and a cold chain transport vehicle with the refrigerated container, and relates to the technical field of refrigeration equipment, the refrigerated container comprises a container body and a refrigerating unit, the refrigerating unit comprises a shell, an outer unit and an inner unit are installed in the shell, the outer unit and the inner unit are connected through a pipeline, and the outer unit and the inner unit are connected through a pipeline. A mounting opening matched with the refrigerating unit is formed in the side wall of the refrigerator body, the refrigerating unit is mounted in the mounting opening in an embedded mode, one part of the refrigerating unit penetrates through the mounting opening to be located in the refrigerator body, the other part of the refrigerating unit penetrates through the mounting opening to be located outside the refrigerator body, and the mounting opening is formed in the side wall of the refrigerator body. The refrigerating unit is embedded through the mounting opening so that the refrigerating unit can be located on the side wall of the refrigerating box, and therefore the space, occupied by the refrigerating unit, in the box body is reduced, and the effective space utilization rate of the refrigerating box is increased.

Description

Technical Field

[0001] The present application relates to the technical field of refrigeration equipment, and more specifically to a refrigerated box and a cold chain transport vehicle equipped with the refrigerated box. Background Art

[0002] As a small cold chain transportation tool, the refrigerated insulated box plays a very important role in the transportation of food, medicine and vaccine. It has the advantages of being easy to carry, compact and simple in structure. In the prior art, refrigerated boxes are generally divided into two forms. One is a refrigerated box with built-in ice bags. When in use, the ice bags need to be frozen first, and then the ice bags and fresh products and other items to be refrigerated are placed in the refrigerated box. In this way, the refrigerated temperature in the refrigerated box is generally maintained by the melting and heat absorption of the ice bags themselves. The refrigerated temperature in the refrigerated box is difficult to control. In long-distance transportation, the ice bags need to be replaced, and the space occupied by the ice bags is large, which greatly reduces the effective space utilization rate of the refrigerated box. The other is a refrigerated box with built-in refrigeration equipment. The refrigerated box uses its own refrigeration equipment to continuously cool in the box to maintain the refrigerated temperature in the refrigerated box. For example, the utility model patent with publication number: CN218583510U discloses a cold storage box, including a box body and a refrigerator, the box body includes a protective outer layer and a heat-insulating inner layer, the heat-insulating inner layer is made of foamed polyurethane, and the heat-insulating inner layer and the protective outer layer are rotationally molded and foamed in one piece; the upper surface of the box body is provided with a groove, and the external unit of the refrigerator is installed in the groove; the opening of the groove is connected to a top cover, the top cover seals the opening of the groove, and the top cover is provided with a plurality of ventilation holes; in this scheme, the external unit of the refrigerator is installed by providing a groove on the upper surface of the box body, and the refrigerator is located on the top of the box body. The refrigerator occupies a large space inside the box body, which greatly reduces the effective space utilization rate of the cold storage box. Summary of the invention

[0003] The technical problem to be solved by the present application is to provide a refrigerated box and a cold chain transport vehicle equipped with the refrigerated box. The refrigerated box is provided with an installation opening on the side wall, and a refrigeration unit is embedded through the installation opening so that the refrigeration unit is located on the side wall of the refrigerated box, thereby reducing the space inside the box occupied by the refrigeration unit and improving the effective space utilization rate of the refrigerated box.

[0004] The present application provides a refrigerator, comprising a box body and a refrigeration unit, wherein the refrigeration unit comprises a shell, an external unit and an internal unit are installed in the shell, the external unit and the internal unit are connected by a pipeline, a side wall of the box body is provided with an installation opening adapted to the refrigeration unit, the refrigeration unit is embedded in the installation opening, a part of the refrigeration unit passes through the installation opening and is located inside the box body, and another part of the refrigeration unit passes through the installation opening and is located outside the box body.

[0005] In the present technical scheme, the interior of the box is cooled by the refrigeration unit to maintain the refrigerated temperature in the refrigerator. The outer unit and the inner unit of the refrigeration unit are formed as a whole through the shell, with high integration and easy disassembly and assembly. The inner unit and the outer unit realize refrigeration cycle through pipelines. By opening a mounting port on the side wall of the box, the refrigeration unit is embedded in the mounting port and is limited to the side wall of the box. The refrigeration unit is installed as a whole. The refrigeration unit and the mounting port of the box are modularly combined and assembled, which is easy to install, occupies a small space and is simple to maintain. It can easily meet the needs of different scenarios, and the overall refrigeration unit is small and light, which is more conducive to movement and mobile operation. A part of the refrigeration unit with the inner unit passes through the mounting port and is located inside the box. The cold air in the box circulates through the inner unit to maintain the refrigerated temperature. The other part of the refrigeration unit with the outer unit passes through the mounting port and is located outside the box. The refrigeration unit is not entirely installed in the box, thereby reducing the space occupied by the refrigeration unit inside the box and improving the effective space utilization rate of the refrigerator.

[0006] As an improvement, the outer unit is installed below the inner unit, and the inner unit and the outer unit are distributed up and down in the shell. In this technical solution, the inner unit and the outer unit are distributed up and down in the shell, and the overall structure distribution is more compact, which is conducive to reducing the thickness of the refrigeration unit, and the refrigeration unit is more compatible with the side wall of the refrigerator, reducing the space occupied by the refrigeration unit inside the box, and improving the effective space utilization rate of the refrigerator.

[0007] As an improvement, a partition is provided in the shell, and the partition is installed between the external unit and the internal unit to separate the external unit and the internal unit up and down. In this technical solution, the internal unit and the external unit are distributed up and down. By being provided in the shell, the partition can not only separate the external unit and the internal unit, but also seal the internal unit in the box, prevent the cold air in the box from leaking, reduce the loss of cold, and improve the sealing of the box.

[0008] As an improvement, the shell includes a first shell and a second shell. The first shell is connected to the partition to form a first cavity for accommodating an external unit, and the opening of the first cavity faces the outside of the box. The second shell is connected to the partition to form a second cavity for accommodating an internal unit, and the opening of the second cavity faces the inside of the box. The bottom of the second shell is provided with an air inlet, and the top of the second shell is provided with an air outlet. In the present technical solution, the shell is provided to be composed of a first shell and a second shell connected. The first shell is connected to the partition to form a first cavity. The first cavity is used to install and accommodate an external unit. The opening of the first cavity is set to the outside of the box, so that the external unit is isolated from the inside of the box to prevent the heat generated by the external unit from affecting the refrigeration efficiency inside the box, isolating external heat from entering the box, and improving the sealing of the box. The second shell is connected to the partition to form a second cavity. The second cavity is used to install and accommodate an internal unit. The opening of the second cavity faces the inside of the box, so that the internal unit is isolated from the outside of the box to prevent the cold air generated by the internal unit from leaking. Reduce the loss of cold air, improve the sealing of the box, the indoor unit and the outdoor unit are separated and installed up and down by a partition, and the installation is simple and reliable; by arranging an air inlet at the bottom of the second shell and an air outlet at the top, the air inlet is the air inlet of the indoor unit, and the air outlet is the air outlet of the indoor unit. The air inlet arranged at the bottom of the second shell is closer to the bottom of the box. As the fan in the indoor unit works, the air enters the indoor unit from the bottom air duct and is discharged from the top air duct, so that the air duct forms a circular closed-loop circulation of cold air, so that the cold air wraps the goods and cools them from all sides to the center without blockage, resulting in small area cooling or no circulation and damage to the refrigeration system.

[0009] As an improvement, the partition is S-shaped; the partition is made of high-density aluminum foil thermal insulation film. In this technical solution, by setting up an S-shaped partition, the indoor and outdoor units can not only be separated up and down but also left and right, and the overall structure is more compact and the structural distribution is reasonable; a high-density aluminum foil thermal insulation film is used as a partition between the indoor and outdoor units to prevent the appearance of cold bridges. The high-density aluminum foil thermal insulation film has good thermal insulation performance, waterproof performance, corrosion resistance and other characteristics. The high-density aluminum foil thermal insulation film itself has adhesive on the inner wall, which can better fit the conductive surface perfectly and reduce the loss of cold.

[0010] As an improvement, the indoor unit includes a fin-type evaporator and a first fan, and the fin-type evaporator is installed above the first fan. In the present technical scheme, the indoor unit adopts a finned evaporator, which has good rigidity and stability, increases the conduction area and heat transfer coefficient of the copper tube and the fin, and increases the disturbance and stirring effect when the air flows through the corrugated fins, thereby improving the heat transfer efficiency and refrigeration efficiency of the evaporator. The finned evaporator mainly provides the heat required for evaporation through the heating chamber, promotes the boiling and vaporization of the liquid, and then passes through the evaporation chamber to completely separate the gas and liquid phases to achieve the refrigeration effect. In the present scheme, the fin spacing of the evaporator is set to 4mm, and the large gap fin spacing is used, which not only reduces the wind resistance but also reduces the energy consumption. At the same time, it can solve the problems of frosting and thawing of the evaporator, meet the long-term working capacity of the refrigeration unit, and there is no need to deliberately add a defrosting device. The evaporator material is set to aluminum foil, which has super high heat conduction efficiency; on the other hand, when the small refrigeration unit is working, the energy stored on the surface of the evaporator is reduced, the amount of water accumulation will also be reduced, and there is no long-term contact between water and components, which further extends the service life of the small refrigeration unit system.

[0011] As an improvement, the external machine includes a microchannel condenser, a second fan and a compressor, and the microchannel condenser and the compressor are connected by a pipeline. In this technical solution, the external machine is set to use a microchannel condenser, which has the advantages of compact structure, high heat exchange efficiency, small size, light weight, energy saving and environmental protection. The microchannel condenser performs heat exchange on the high-temperature and high-pressure gas discharged from the compressor. The high-temperature and high-pressure gas passes through the condenser to become a medium-temperature and high-pressure liquid and is stored in a condensation tank. Since the refrigerant has a very short flow path inside the microchannel condenser, the heat transfer distance is greatly shortened, thereby improving the heat transfer efficiency and reducing the refrigeration energy consumption.

[0012] As an improvement, the microchannel condenser is connected to a liquid storage tank, and the microchannel condenser stores cooling liquid through the liquid storage tank. In this technical solution, the microchannel condenser adopts the form of a self-contained liquid storage tank, and the liquid storage tank and the microchannel condenser are modular and integrated, so that the functions of the condenser and the liquid storage tank are two-in-one. The microchannel condenser is cooled into liquid and stored in the liquid storage tank. The liquid storage tank has the advantages of expanding the condenser capacity, balancing the pressure, and storing liquid refrigerant. At the same time, it ensures the safety during production and the efficient operation of the refrigeration system; in terms of technology, the two components are processed into one component to reduce material costs and assembly risks, which is more suitable for small refrigeration units.

[0013] As an improvement, the sum of the internal volumes of the microchannel condenser and the liquid storage tank is greater than the internal volume of the finned evaporator in the indoor unit. In this technical solution, the temperature difference deviation of the refrigeration unit under different temperature environments can be solved, so that it is more suitable for various working requirements such as 20℃, 30℃, 40℃, etc., and there are no problems such as failure to meet the target temperature, excessive cooling capacity, severe frosting and blockage, and unstable operation.

[0014] As an improvement, the shell is made of polycarbonate plastic. In this technical solution, the shell is mainly made of polycarbonate plastic, which has the advantages of excellent transparency and strength, not easy to deform, and has good heat resistance, impact resistance, and UV resistance. It is particularly suitable as the shell material of a small refrigeration unit to protect important refrigeration components. The shell reserves ventilation space and blocks external heat from entering the refrigeration heat exchange part. At the same time, it also enhances the service life and damage resistance of the small refrigeration unit, which is more conducive to long-term sustainable development.

[0015] The present application may also provide a cold chain transport vehicle, comprising any one of the aforementioned refrigerated boxes. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of a refrigerator box in the present application.

[0017] Figure 2 This is a schematic diagram of the explosion structure of a refrigerator in the present application.

[0018] Figure 3 This is a schematic cross-sectional view of a refrigerator box according to the present application.

[0019] Figure 4 It is a schematic diagram of the three-dimensional structure of the refrigeration unit in this application.

[0020] Figure 5 This is a schematic diagram of the explosion structure of the refrigeration unit in this application.

[0021] Figure 6 It is a schematic diagram of the structure of the external unit and the internal unit in this application.

[0022] As shown in the figure: 1. Box body; 11. Installation port; 2. Refrigeration unit; 21. External unit; 211. Microchannel condenser; 212. Second fan; 213. Compressor; 214. Liquid storage tank; 22. Internal unit; 221. Finned evaporator; 222. First fan; 23. Partition; 24. First shell; 25. Second shell; 251. Air inlet; 252. Air outlet. DETAILED DESCRIPTION

[0023] In order to better understand the present application, a more detailed description of various aspects of the present application will be made with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and do not limit the scope of the present application in any way. Throughout the specification, the same figure numerals refer to the same elements.

[0024] In the drawings, the thickness, size and shape of objects have been slightly exaggerated for ease of explanation. The drawings are only examples and are not drawn strictly to scale.

[0025] It should also be understood that the terms “comprises,” “including,” “has,” “contains,” and “comprising,” when used in this specification, indicate the presence of the described features, integers, steps, operations, elements, and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, and / or combinations thereof.

[0026] like Figures 1 to 6 As shown, the present application discloses a refrigerator, including a box body 1 and a refrigeration unit 2, the refrigeration unit 2 includes a shell, an external machine 21 and an internal machine 22 are installed in the shell, the external machine 21 and the internal machine 22 are connected by a pipeline, a side wall of the box body 1 is provided with an installation opening 11 adapted to the refrigeration unit 2, the refrigeration unit 2 is embedded in the installation opening 11, the interior of the box body 1 is refrigerated by the refrigeration unit 2 to maintain the refrigerated temperature in the refrigerator, the external machine 21 and the internal machine 22 of the refrigeration unit 2 are formed as a whole through the shell, the integration is high and it is easy to disassemble and assemble, the internal machine 22 and the external machine 21 realize the refrigeration cycle through the pipeline, the installation opening 11 is provided on the side wall of the box body 1, the refrigeration unit 2 is embedded in the installation opening 11 so as to be limited on the side wall of the box body 1, the refrigeration unit 2 is installed as an integral part, the refrigeration unit 2 and the box The mounting opening 11 of the body 1 is modularly assembled, which is easy to install, occupies a small space, and is simple to maintain. It can easily meet the use requirements according to the needs of different scenarios, and the overall refrigeration unit 2 is small and light, which is more conducive to movement and mobile operation. A part of the refrigeration unit 2 passes through the mounting opening 11 and is located inside the box body 1, and another part of the refrigeration unit 2 passes through the mounting opening 11 and is located outside the box body 1. A part of the refrigeration unit 2 with an internal machine 22 passes through the mounting opening 11 and is located inside the box body 1. The cold air circulates in the box body 1 through the internal machine 22 to maintain the refrigeration temperature. The other part of the refrigeration unit 2 with an external machine 21 passes through the mounting opening 11 and is located outside the box body 1. The refrigeration unit 2 is not entirely installed in the box body 1, thereby reducing the space occupied by the refrigeration unit 2 inside the box body 1 and improving the effective space utilization rate of the cold storage box.

[0027] More specifically, Figure 5 and Figure 6As shown, the outer unit 21 is installed below the inner unit 22, and the inner unit 22 and the outer unit 21 are distributed up and down in the shell. The inner unit 22 and the outer unit 21 are distributed up and down in the shell, and the overall structure distribution is more compact, which is beneficial to reducing the thickness of the refrigeration unit 2. The refrigeration unit 2 is more compatible with the side wall of the cold storage box, reducing the space occupied by the refrigeration unit 2 inside the box body 1, and improving the effective space utilization rate of the cold storage box.

[0028] More specifically, Figure 5 and Figure 6 As shown, a partition 23 is provided in the shell, and the partition 23 is installed between the external unit 21 and the internal unit 22 to separate the external unit 21 and the internal unit 22 up and down. The internal unit 22 and the external unit 21 are distributed up and down. By being provided in the shell, the partition 23 can not only separate the external unit 21 and the internal unit 22, but also can seal the internal unit 22 in the box body 1, thereby preventing the leakage of cold air in the box body 1, reducing the loss of cold, and improving the sealing of the box body 1.

[0029] More specifically, Figures 4 to 6 As shown, the housing includes a first housing 24 and a second housing 25. The first housing 24 is connected to the partition 23 to form a first cavity for accommodating the external unit 21. The second housing 25 is connected to the partition 23 to form a second cavity for accommodating the internal unit 22. The housing is configured to be composed of the first housing 24 and the second housing 25 connected. The first housing 24 is connected to the partition 23 to form a first cavity. The first cavity is used to install and accommodate the external unit 21. The opening of the first cavity is configured to face the outside of the housing 1, so that the external unit 21 is isolated from the inside of the housing 1 to prevent The heat generated by the external machine 21 affects the refrigeration efficiency inside the box 1, and the external heat is isolated from entering the box 1 to improve the sealing of the box 1. A second shell 25 is provided to be connected with the partition 23 to form a second cavity, and the second cavity is used to install and accommodate the internal machine 22. The opening of the second cavity faces the inside of the box 1, so that the internal machine 22 is isolated from the outside of the box 1, and the cold air generated by the internal machine 22 is prevented from leaking, reducing the loss of cold, and improving the sealing of the box 1. The internal machine 22 and the external machine 21 are separated and installed up and down through the partition 23, and the installation is simple and reliable;

[0030] like Figures 4 to 6As shown, an air inlet 251 is provided at the bottom of the second shell 25, and an air outlet 252 is provided at the top of the second shell 25. By providing the air inlet 251 at the bottom of the second shell 25 and the air outlet 252 at the top, the air inlet 251 is the air inlet 251 of the indoor unit 22, and the air outlet 252 is the air outlet 252 of the indoor unit 22. The air inlet 251 provided at the bottom of the second shell 25 is closer to the bottom of the box body 1. As the fan in the indoor unit 22 works, air enters the indoor unit 22 from the bottom air duct and is then discharged from the top air duct, so that the air duct forms a circular closed-loop circulation of cold air, so that the cold air wraps the goods and cools them from all sides to the center without blockage, resulting in small area cooling or no circulation and damage to the refrigeration system.

[0031] More specifically, Figure 5 As shown, the partition 23 is S-shaped. By setting the S-shaped partition 23, the indoor unit 22 and the outdoor unit 21 can be separated not only up and down but also left and right, and the structure of the whole machine is more compact and the structural distribution is reasonable; the partition 23 adopts high-density aluminum foil thermal insulation film, and the high-density aluminum foil thermal insulation film is used as the partition between the indoor unit 22 and the outdoor unit 21 to prevent the occurrence of cold bridges. The high-density aluminum foil thermal insulation film has good thermal insulation performance, waterproof performance, corrosion resistance and other characteristics. The inner wall of the high-density aluminum foil thermal insulation film itself has adhesive, which can better fit the conduction surface perfectly and reduce the loss of cold.

[0032] More specifically, Figure 5 and Figure 6 As shown, the indoor unit 22 includes a finned evaporator 221 and a first fan 222. The finned evaporator 221 is installed above the first fan 222. The indoor unit 22 adopts the finned evaporator 221. The finned evaporator 221 has good rigidity and stability, increases the conduction area and heat transfer coefficient of the copper tube and the fin, and increases the disturbance and stirring effect when the air flows through the corrugated fins, thereby improving the heat transfer efficiency and cooling efficiency of the evaporator. The finned evaporator 221 mainly provides the heat required for evaporation through the heating chamber, promotes the boiling and vaporization of the liquid, and then passes through the evaporation chamber to completely separate the gas and liquid phases. To achieve the cooling effect, the fin spacing of the evaporator is set to 4mm in this solution. The large-gap fin spacing not only reduces wind resistance but also reduces energy consumption. At the same time, it can solve the problems of frosting and thawing of the evaporator, meet the long-term working capacity of the refrigeration unit 2, and there is no need to specially add a defrosting device. The evaporator material is set to aluminum foil, which has ultra-high heat conduction efficiency; on the other hand, when the small refrigeration unit 2 is working, the energy stored on the surface of the evaporator is reduced, the amount of water accumulation will also be reduced, and there is no long-term contact between water and components, which further extends the service life of the small refrigeration unit 2 system.

[0033] More specifically, Figure 5 and Figure 6As shown, the external unit 21 includes a microchannel condenser 211, a second fan 212 and a compressor 213. The microchannel condenser 211 and the compressor 213 are connected by a pipeline. The external unit 21 adopts the microchannel condenser 211. The microchannel condenser 211 has the advantages of compact structure, high heat exchange efficiency, small size, light weight, energy saving and environmental protection. The microchannel condenser 211 performs heat exchange on the high-temperature and high-pressure gas discharged from the compressor 213. The high-temperature and high-pressure gas passes through the condenser to become a medium-temperature and high-pressure liquid and is stored in a condensation tank. Since the refrigerant flow path inside the microchannel condenser 211 is very short, the heat transfer distance is greatly shortened, thereby improving the heat transfer efficiency and reducing the refrigeration energy consumption.

[0034] More specifically, Figure 6 As shown, the microchannel condenser 211 is connected to a liquid storage tank 214, and the microchannel condenser 211 stores cooling liquid through the liquid storage tank 214. The microchannel condenser 211 adopts the form of a built-in liquid storage tank 214, and the liquid storage tank 214 and the microchannel condenser 211 are in a modular integrated structure, so that the functions of the condenser and the liquid storage tank 214 are two-in-one. The microchannel condenser 211 is cooled into liquid and stored in the liquid storage tank 214. The liquid storage tank 214 has the advantages of expanding the condenser capacity, balancing the pressure, and storing liquid refrigerant. At the same time, it ensures the safety during production and the efficient operation of the refrigeration system; in terms of technology, the two components are processed into one component, which reduces material costs and assembly risks, and is more suitable for small refrigeration units 2.

[0035] More specifically, the sum of the internal volumes of the microchannel condenser 211 and the liquid storage tank 214 is greater than the internal volume of the finned evaporator 221 in the indoor unit 22, which can solve the temperature difference deviation of the refrigeration unit 2 in different temperature environments, making it more suitable for various working requirements such as 20°C, 30°C, 40°C, and there are no problems such as target temperature not meeting the standard, excessive cooling capacity, severe frosting and blockage, and unstable operation.

[0036] More specifically, the shell is made of polycarbonate plastic. The shell is mainly made of polycarbonate plastic. Polycarbonate plastic has the advantages of excellent transparency and strength, and is not easy to deform. At the same time, it also has good heat resistance, impact resistance, and UV resistance. It is particularly suitable as the shell material of a small refrigeration unit 2 to protect important refrigeration components. The shell reserves ventilation space and blocks external heat from entering the refrigeration heat exchange part. At the same time, it also enhances the service life and damage resistance of the small refrigeration unit 2, which is more conducive to long-term sustainable development.

[0037] The present application may also provide a cold chain transport vehicle, comprising the aforementioned refrigerated box.

[0038] The present application is not limited to the above-mentioned optimal implementation mode. Anyone can derive other forms of products under the inspiration of the present application. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present application.

Claims

1. A refrigerator, comprising a box body (1) and a refrigeration unit (2), characterized in that: The refrigeration unit (2) comprises a shell, an external unit (21) and an internal unit (22) are installed in the shell, the external unit (21) and the internal unit (22) are connected via a pipeline, a side wall of the housing (1) is provided with an installation opening (11) adapted to the refrigeration unit (2), the refrigeration unit (2) is embedded in the installation opening (11), a part of the refrigeration unit (2) passes through the installation opening (11) and is located inside the housing (1), and another part of the refrigeration unit (2) passes through the installation opening (11) and is located outside the housing (1).

2. A refrigerator according to claim 1, characterized in that: The outer machine (21) is installed below the inner machine (22), and the inner machine (22) and the outer machine (21) are arranged vertically in the housing.

3. A refrigerator according to claim 2, characterized in that: A partition (23) is arranged in the shell, and the partition (23) is installed between the external unit (21) and the internal unit (22) to separate the external unit (21) and the internal unit (22) up and down.

4. A refrigerator according to claim 3, characterized in that: The shell comprises a first shell (24) and a second shell (25); the first shell (24) is connected to the partition (23) to form a first cavity for accommodating an external unit (21); the opening of the first cavity faces the outside of the box (1); the second shell (25) is connected to the partition (23) to form a second cavity for accommodating an internal unit (22); the opening of the second cavity faces the inside of the box (1); an air inlet (251) is provided at the bottom of the second shell (25); and an air outlet (252) is provided at the top of the second shell (25).

5. A refrigerator according to claim 3, characterized in that: The partition (23) is S-shaped; the partition (23) is made of high-density aluminum foil thermal insulation film.

6. A refrigerator according to claim 1, characterized in that: The indoor unit (22) comprises a fin-type evaporator (221) and a first fan (222), and the fin-type evaporator (221) is installed above the first fan (222).

7. A refrigerator according to claim 1 or 6, characterized in that: The external unit (21) comprises a microchannel condenser (211), a second fan (212) and a compressor (213), and the microchannel condenser (211) and the compressor (213) are connected via a pipeline.

8. A refrigerator according to claim 7, characterized in that: The microchannel condenser (211) is connected to a liquid storage tank (214), and the microchannel condenser (211) stores cooling liquid through the liquid storage tank (214).

9. A refrigerator according to claim 8, characterized in that: The sum of the internal volumes of the microchannel condenser (211) and the liquid storage tank (214) is greater than the internal volume of the finned evaporator (221) in the internal unit (22).

10. The refrigerator according to claim 1, characterized in that: The shell is made of polycarbonate plastic.

11. A cold chain transport vehicle, characterized in that: A refrigerator comprising the refrigerator described in any one of claims 1-10.

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