CN220038835U - Refrigerating apparatus - Google Patents

Abstract

The utility model relates to the technical field of low-temperature storage, and discloses refrigeration equipment which comprises a box body, a door body arranged at an opening of the box body, a cold guide base, a refrigerator, a terminal heat exchanger and a cold guide low-temperature heat pipe. The cold guide base is arranged at the outer side of the box body and comprises a cold guide channel for guiding cold and a mounting port connected with the cold guide channel; the cold end of the refrigerator is detachably arranged at the mounting port; the terminal heat exchanger is arranged in the inner cavity of the box body; the cold-conducting low-temperature heat pipe comprises a first end connected with the cold-conducting base and a second end inserted into the inner cavity of the box body, and can be used for connecting the cold-conducting runner and the terminal heat exchanger. The refrigerator can be arranged at the mounting opening of the cold guide base and is connected with the cold guide low-temperature heat pipe through the cold guide runner, and the cold guide low-temperature heat pipe is connected with the inner cavity of the box body so as to realize heat exchange between the refrigerator and the inner cavity of the box body. The cold-conducting runner and the cold-conducting low-temperature heat pipe can be arranged in the cold-conducting base and/or the box body, so that the complexity of the whole structure of the refrigeration equipment is reduced, and the whole volume of the refrigeration equipment is further reduced.

Description

Refrigerating apparatus

Technical Field

The utility model relates to the technical field of low-temperature storage, for example to refrigeration equipment.

Background

The ultra-low temperature refrigeration equipment is refrigeration equipment widely applied to the fields of medical cold chains, low-temperature preservation and experiments for preparing liquid nitrogen and special materials, and the like, and a Stirling refrigerator is generally adopted by the existing ultra-low temperature refrigerator for realizing better refrigeration effect. The Stirling refrigerator is a mechanical refrigerator driven by electric power based on Stirling refrigeration technology, and the working principle is that gas works by adiabatic expansion, namely, works according to reverse Stirling cycle to refrigerate. Therefore, the Stirling refrigerator can realize rapid refrigeration in a deep low temperature region, and has extremely high advantages in terms of volume, bump resistance, weight loss resistance and turnover resistance compared with other refrigerators.

In order to realize lower working temperature, the existing ultralow temperature refrigeration equipment is generally provided with a plurality of groups of Stirling refrigerators to work in a combined way.

In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

the existing ultralow temperature refrigeration equipment is provided with a plurality of groups of Stirling refrigerators, so that a plurality of groups of cold guide circuits are required to be correspondingly arranged, the complexity of the whole structure of the refrigeration equipment can be increased, and the whole volume of the refrigeration equipment is further increased.

It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the utility model and thus may include information that does not form the prior art that is already known to those of ordinary skill in the art.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview, and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended as a prelude to the more detailed description that follows.

The embodiment of the disclosure provides a refrigeration equipment, installs the refrigerator in leading cold base to realize heat exchange through leading cold runner and leading cold low temperature heat pipe and storing district in the box, in order to realize ultralow operating temperature, will lead cold runner setting and can reduce refrigeration equipment overall structure's complexity in leading cold base, and then reduce equipment holistic volume.

The embodiment of the disclosure provides refrigeration equipment, which comprises a box body, a door body arranged at an opening of the box body, a cold guide base, a refrigerator, a terminal heat exchanger and a cold guide low-temperature heat pipe. The cold guide base is arranged at the outer side of the box body and comprises a cold guide channel for guiding cold and a mounting port connected with the cold guide channel; the cold end of the refrigerator is detachably arranged at the mounting port; the terminal heat exchanger is arranged in the inner cavity of the box body; the cold-conducting low-temperature heat pipe comprises a first end connected with the cold-conducting base and a second end inserted into the inner cavity of the box body, and can be used for connecting the cold-conducting runner and the terminal heat exchanger.

In some embodiments, the cold end of the refrigerator and the cold guide base mounting port are correspondingly provided with screw thread structures to detachably mount the refrigerator to the cold guide base.

In some embodiments, when the cold guide base mounting opening and the refrigerator are provided in plurality, the cold guide base mounting opening and the refrigerator are symmetrically provided.

In some embodiments, the cold runner is a sealed structure, and the interior thereof is filled with a cold conducting medium.

In some embodiments, the refrigerator includes a refrigeration end mounted to the cold-conducting base and a heat dissipation end disposed opposite the refrigeration end, the heat dissipation end being provided with a heat sink.

In some embodiments, the cold-conducting low-temperature heat pipe is arranged in the box body in a penetrating way, and the heat-insulating material is arranged at the penetrating part of the box body.

In some embodiments, the cold-conducting low temperature heat pipe is less than or equal to a predetermined diameter.

In some embodiments, the plurality of cold-conducting low temperature heat pipes are arranged symmetrically.

In some embodiments, the terminal heat exchanger is provided in plurality and is connected with the cold-conducting low-temperature heat pipe respectively.

In some embodiments, the refrigeration appliance further includes a fan. The fan is arranged at the outer side of the box body, and the blowing direction of the fan is limited to be towards the refrigerator.

The refrigerating equipment provided by the embodiment of the disclosure can realize the following technical effects:

the embodiment of the disclosure provides refrigeration equipment, which comprises a box body, a door body arranged at an opening of the box body, a cold guide base, a refrigerator, a terminal heat exchanger and a cold guide low-temperature heat pipe. The cold guide base is arranged at the outer side of the box body and comprises a cold guide channel for guiding cold and a mounting port connected with the cold guide channel; the cold end of the refrigerator is detachably arranged at the mounting port; the terminal heat exchanger is arranged in the inner cavity of the box body; the cold-conducting low-temperature heat pipe comprises a first end connected with the cold-conducting base and a second end inserted into the inner cavity of the box body, and can be used for connecting the cold-conducting runner and the terminal heat exchanger. The refrigerator can be arranged at the mounting opening of the cold guide base and is connected with the cold guide low-temperature heat pipe through the cold guide runner, and the cold guide low-temperature heat pipe is connected with the inner cavity of the box body so as to realize heat exchange between the refrigerator and the inner cavity of the box body. The cold-conducting runner and the cold-conducting low-temperature heat pipe can be arranged in the cold-conducting base and/or the box body, so that the complexity of the whole structure of the refrigeration equipment is reduced, and the whole volume of the refrigeration equipment is further reduced.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the utility model.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which like reference numerals refer to similar elements, and in which:

fig. 1 is a schematic structural view of a refrigeration apparatus according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of another refrigeration appliance provided by an embodiment of the present disclosure;

FIG. 3 is a schematic view of a portion of a refrigeration appliance according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of a refrigerator according to an embodiment of the present disclosure;

fig. 5 is a schematic structural view of a cooling guide base according to an embodiment of the present disclosure.

Reference numerals:

10: a case; 20: a refrigerating machine; 201: a cold end is manufactured; 202: a heat dissipating end; 30: a terminal heat exchanger; 40: a cold guide base; 401: a cold guide base mounting port; 50: cold conducting low temperature heat pipe.

Detailed Description

So that the manner in which the features and techniques of the disclosed embodiments can be understood in more detail, a more particular description of the embodiments of the disclosure, briefly summarized below, may be had by reference to the appended drawings, which are not intended to be limiting of the embodiments of the disclosure. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawing.

The terms first, second and the like in the description and in the claims of the embodiments of the disclosure and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe embodiments of the present disclosure. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are used primarily to better describe embodiments of the present disclosure and embodiments thereof and are not intended to limit the indicated device, element, or component to a particular orientation or to be constructed and operated in a particular orientation. Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the embodiments of the present disclosure will be understood by those of ordinary skill in the art in view of the specific circumstances.

In addition, the terms "disposed," "connected," "secured" and "affixed" are to be construed broadly. For example, "connected" may be in a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the above terms in the embodiments of the present disclosure may be understood by those of ordinary skill in the art according to specific circumstances.

The term "plurality" means two or more, unless otherwise indicated.

In the embodiment of the present disclosure, the character "/" indicates that the front and rear objects are an or relationship. For example, A/B represents: a or B.

The term "and/or" is an associative relationship that describes an object, meaning that there may be three relationships. For example, a and/or B, represent: a or B, or, A and B.

It should be noted that, without conflict, the embodiments of the present disclosure and features of the embodiments may be combined with each other.

The ultralow temperature refrigerator, also called an ultralow temperature refrigerator or an ultralow temperature preservation box, is widely applied to the fields of medical cold chain transportation, preparation of liquid nitrogen, ultralow temperature preservation of special materials, scientific research experiments and the like. However, the manufacturing limitation of the traditional ultralow temperature refrigeration equipment such as the ultralow temperature refrigerator is large, and the ultralow temperature refrigerator with the working temperature lower than-60 ℃ cannot be produced in mass, so that the existing ultralow temperature refrigerator generally adopts a Stirling refrigerator for refrigeration.

The Stirling refrigerator is a mechanical refrigerator driven by electric power based on Stirling refrigeration technology, and the working principle is that gas works by adiabatic expansion, namely, the gas works according to reverse Stirling cycle to realize rapid refrigeration in a deep low temperature region, and the deep low temperature can reach-190 ℃. Meanwhile, compared with the traditional ultralow temperature refrigeration equipment of the compressor, the Stirling refrigerator has the advantages of no valve in the interior and small irreversible loss in the interior, high efficiency, compact structure, light weight and the like.

However, in order to achieve lower working temperature, the existing ultralow temperature refrigeration equipment generally adopts a plurality of groups of Stirling refrigerators, and performs heat exchange with a working area through corresponding cold guide lines, so that the overall complexity of the refrigeration equipment is increased, the overall size of the refrigeration equipment is further increased, and the use experience of a user is reduced.

When the refrigerating equipment is provided with the plurality of refrigerating machines, the plurality of corresponding cold guide flow passages can be arranged in the cold guide base, the refrigerating machines are correspondingly arranged on the cold guide base, and then the cold guide flow passages and the inner cavity of the box body are connected through the cold guide low-temperature heat pipes, so that heat exchange between the refrigerating machines and the inner cavity of the box body is realized, the complexity of the integral structure of the refrigerating equipment is reduced, and the integral size of the refrigerating equipment is further reduced.

As shown in fig. 1 to 5, the embodiment of the present disclosure provides a refrigeration apparatus including a cabinet 10 and a door body disposed at an opening of the cabinet 10, and further including a cold guide base 40, a refrigerator 20, a terminal heat exchanger 30, and a cold guide low temperature heat pipe 50. The cold guide base 40 is arranged at the outer side of the box body 10 and comprises a cold guide channel for guiding cold and a mounting port connected with the cold guide channel; the cold end of the refrigerator 20 is detachably arranged at the mounting port; the terminal heat exchanger 30 is arranged in the inner cavity of the box body 10; the cold-conducting low-temperature heat pipe 50 comprises a first end connected with the cold-conducting base 40 and a second end inserted into the inner cavity of the box body 10, and can be used for connecting the cold-conducting channel and the terminal heat exchanger 30.

Specifically, the first end of the cold-conducting low-temperature heat pipe 50 is connected to a surface of the cold-conducting base 40 corresponding to the box 10, and the cold-conducting low-temperature heat pipe 50 is detachably connected to the cold-conducting base 40. The cold guide base 40 is fixedly arranged on the outer side of the box body 10 so that the refrigerator 20 can rapidly dissipate heat, and the cold guide base 40 is arranged to be attached to the box body 10 so as to reduce the area of the cold guide low-temperature heat pipe 50 exposed in the external environment, so that the whole volume of the refrigeration equipment can be further reduced, and the loss of cold in the transmission process can be reduced.

Optionally, when the refrigeration temperature is higher than the preset temperature, a fan is further disposed in the box 10, and the terminal heat exchanger 30 is a tube-fin heat exchanger, so that the fan can uniformly blow the cooling capacity of the heat exchanger into the box 10 to make the temperature in the box 10 more average and the refrigeration speed faster.

It will be appreciated that the tube and fin heat exchanger has a higher heat transfer efficiency than other heat exchangers due to its secondary heat transfer characteristics. Meanwhile, the tube-fin heat exchanger has the advantages of compactness, light weight and the like, and the whole volume of the refrigeration equipment can be reduced.

Optionally, when the cooling temperature is lower than the preset temperature, the terminal heat exchanger 30 is of a blown-up structure, and directly emits the cooling energy into the box 10 to cool the box 10. The structure of the refrigeration equipment can be simplified, so that the volume of the refrigeration equipment is reduced, and the energy consumption of the refrigeration equipment is reduced.

It can be understood that the expansion heat exchanger is a heat exchanger formed by compounding double-layer aluminum plates, and is generally manufactured by printing a pattern of a pipeline on the joint surface of the aluminum plates after surface treatment of the aluminum plates with certain specification, welding the composite panel according to the pattern, and performing expansion by using nitrogen after heat treatment such as hot rolling.

As shown in fig. 1 and 2, optionally, the cold guide base 40 is disposed above the box 10, so that the cold generated by the refrigerator 20 can be transferred into the box 10 more quickly under the action of gravity, and the efficiency of transferring the cold of the refrigerator 20 is further increased.

As shown in fig. 4 and 5, in some embodiments, the cold end of the refrigerator 20 and the cold guide base mounting opening 401 are correspondingly provided with screw structures to detachably mount the refrigerator 20 to the cold guide base 40.

Specifically, the refrigerator 20 is detachably mounted on the mounting opening 401 of the cold guiding base through a screw structure, and compared with other detachable connection modes, the screw connection has the advantages of simple structure, reliable connection, convenient assembly and disassembly and the like.

In some embodiments, when the cold base mounting opening 401 and the refrigerator 20 are provided in plurality, the cold base mounting opening 401 and the refrigerator 20 are symmetrically provided.

It will be appreciated that the stirling cooler 20 is primarily cooled by the stirling cycle, and the driving force for its operation is derived from the linear motor portion of the component structure, which is in operation reciprocating axially along the stirling cooler 20, thereby causing axial vibration of the cooler 20 which, when exceeding a certain amplitude, affects the operating efficiency and life of the refrigeration unit.

Specifically, when a plurality of refrigerators 20 need to be provided, the cold guide base 40 is correspondingly provided with a plurality of cold guide base mounting openings 401, a plurality of cold guide channels are correspondingly provided in the cold guide base 40 to be respectively connected with the plurality of refrigerators 20, and the plurality of cold guide base mounting openings 401 are symmetrically arranged, so that vibration of the plurality of refrigerators 20 can be mutually offset to reduce vibration of the whole refrigeration equipment, and further work efficiency and service life of the refrigeration equipment are improved. When the number of refrigerators 20 is singular, one refrigerator 20 is mounted on the top end surface of the cold guide base 40, and the remaining refrigerators 20 are mounted on the side wall surface of the cold guide base 40.

In some implementations, the number of refrigerators 20 is one, and the number of cold guide base mounting openings 401 is also one. The cooling-conducting base mounting opening 401 is provided on the top surface of the cooling-conducting base 40, and the refrigerator 20 is detachably mounted on the top surface of the cooling-conducting base 40.

In other implementations, the number of refrigerators 20 is two, and the number of cold guide base mounting openings 401 is also two. The two cold guide base mounting openings 401 are respectively provided on two opposite side wall surfaces of the cold guide base 40, and the refrigerator 20 is symmetrically mounted on the two side wall surfaces of the cold guide base 40.

In other implementations, the number of refrigerators 20 is three, and the number of cold guide base mounting openings 401 is also three. One cold guide base mounting port 401 is arranged on the top end surface of the cold guide base 40, and the other two cold guide base mounting ports 401 are respectively arranged on two opposite side wall surfaces of the cold guide base 40; one refrigerator 20 is installed on the top end surface of the cold guide base 40, and the other two refrigerators 20 are symmetrically installed on both side wall surfaces of the cold guide base 40.

In some embodiments, the cold runner is a sealed structure, and the interior thereof is filled with a cold conducting medium.

Specifically, sealing structures are arranged at two ends of the cold guide flow channel, and the inside of the cold guide flow channel is vacuumized and filled with cold guide medium, so that the efficiency of cold energy transmission is improved.

Optionally, a sealing channel is formed inside the cold guide base 40, and the channel is filled with a cold guide medium after being vacuumized. In the present embodiment, the cooling base 40 forms a heat pipe type cooling base structure. Optionally, the material of the cold guide base 40 includes an aluminum material or an oxygen-free copper material.

In some practical applications, the cold-conducting base mounting opening 401, the cold-conducting runner and the cold-conducting low-temperature heat pipe 50 are communicated in pairs, the refrigerator 20 is mounted on the cold-conducting base mounting opening 401, and after the cold-conducting low-temperature heat pipe 50 and the cold-conducting runner are communicated, the cold-conducting medium is filled into the cold-conducting runner, and a sealing structure is arranged at the joint of the cold-conducting runner and the cold-conducting runner to prevent the cold-conducting medium from leaking.

In other practical applications, the cold guide base mounting port 401, the cold guide channel and the cold guide low-temperature heat pipe 50 are mutually independent, and sealing structures are arranged at two ends of the cold guide channel, so that the inside of the cold guide channel is vacuumized and refilled with cold guide medium.

As shown in fig. 4, in some embodiments, the refrigerator 20 includes a cooling end 201 mounted to the cooling guide base 40 and a heat dissipation end 202 disposed opposite the cooling end 201, the heat dissipation end 202 being provided with a heat sink.

Optionally, the heat sink is a tube-fin heat sink, and since the tube-fin heat sink has the characteristic of secondary heat transfer, the heat transfer efficiency is higher than other heat sinks to rapidly dissipate the heat of the refrigerator 20 to the surrounding environment. Meanwhile, the tube-fin radiator has the advantages of compactness, light weight and the like, and the whole volume of the refrigeration equipment can be further reduced.

In some embodiments, the case 10 includes a housing, a liner, and an insulating layer. The inner container is arranged in the shell; the heat preservation layer is arranged between the shell and the inner container. Wherein, the heat preservation is the thermal insulation material.

Specifically, the heat-insulating layer is a heat-insulating material such as a foam material. The box body 10 and the door body arranged at the opening of the box body 10 can jointly form a storage area, the door body and the box body 10 are correspondingly provided with sealing structures, and when the door body is closed, the storage area can be in a sealing state.

In some embodiments, the cold-conducting cryogenic heat pipe 50 is less than or equal to a predetermined diameter therebetween.

It will be appreciated that the cold-conducting low temperature heat pipe 50 is inserted into the box 10, so that the box 10 needs to be provided with a hole structure at a corresponding position, and the smaller the diameter of the hole structure is, the smaller the diameter of the cold-conducting low temperature heat pipe 50 is.

Specifically, the diameter of the cold-conducting low temperature heat pipe 50 is less than or equal to 8mm, for example, the diameter of the cold-conducting low temperature heat pipe 50 may be 8mm, 7mm, 6mm, 5mm or 4mm. By this arrangement, the leakage amount of the cold air in the case 10 can be reduced.

In some embodiments, the case 10 is provided with insulation cotton or insulation foam at the hole structure, which can prevent leakage of cool air in the case 10 while fixing the cool conducting low temperature heat pipe 50.

As shown in fig. 2, in some embodiments, a plurality of cold-conducting cryogenic heat pipes 50 are provided, and the plurality of cold-conducting cryogenic heat pipes 50 are symmetrically arranged.

Specifically, when a large amount of cold is required to be transferred, a plurality of cold-conducting low-temperature heat pipes 50 may be provided to secure the amount of cold transfer. When a plurality of cold-conducting low temperature heat pipes 50 are provided and the plurality of cold-conducting low temperature heat pipes 50 are all connected with one terminal heat exchanger 30, the plurality of cold-conducting low temperature heat pipes 50 are symmetrically arranged with the symmetry axis of the terminal heat exchanger 30.

In some embodiments, the terminal heat exchanger 30 is provided in plurality and is connected to the cold-conducting low temperature heat pipe 50, respectively.

Specifically, the plurality of terminal heat exchangers 30 are uniformly distributed in the box 10 and are respectively connected with the cold conduction runner through the cold conduction low-temperature heat pipes 50, so that the temperature in the box 10 can be more balanced and the cooling speed is faster.

In some embodiments, the refrigeration appliance further includes a fan. The blower is disposed outside the cabinet 10, and its blowing direction is defined toward the refrigerator 20.

Specifically, the fan is fixedly disposed at the outer side of the box 10, and can blow air to the heat dissipation end 202 of the refrigerator 20, so as to increase the heat dissipation efficiency of the heat dissipation end 202 of the refrigerator 20, and further ensure that the refrigeration equipment can stably work.

The above description and the drawings illustrate embodiments of the disclosure sufficiently to enable those skilled in the art to practice them. Other embodiments may include structural and other modifications. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in, or substituted for, those of others. The embodiments of the present disclosure are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (10)

1. The utility model provides a refrigeration plant, includes the box with set up in the door body of box opening part, its characterized in that still includes:

the cold guide base is arranged at the outer side of the box body and comprises a cold guide channel for guiding cold and a mounting port connected with the cold guide channel;

the cold end of the refrigerator is detachably arranged at the mounting port;

the terminal heat exchanger is arranged in the inner cavity of the box body; and, a step of, in the first embodiment,

the cold-conducting low-temperature heat pipe comprises a first end connected with the cold-conducting base and a second end inserted into the inner cavity of the box body, and can be used for connecting the cold-conducting runner with the terminal heat exchanger.

2. A refrigeration device according to claim 1, wherein,

the cold end of the refrigerator and the mounting opening of the cold guide base are correspondingly provided with threaded structures, so that the refrigerator is detachably mounted on the cold guide base.

3. A refrigeration device according to claim 1, wherein,

when the cold guide base mounting opening and the refrigerator are provided with a plurality of cold guide base mounting openings, the cold guide base mounting openings and the refrigerator are symmetrically arranged.

4. A refrigeration device according to claim 1, wherein,

the cold guide flow channel is of a sealing structure, and the inside of the cold guide flow channel is filled with cold guide medium.

5. A refrigeration device according to claim 1, wherein,

the refrigerator comprises a refrigeration end arranged on the cold guide base and a heat dissipation end arranged opposite to the refrigeration end, wherein the heat dissipation end is provided with a radiator.

6. A refrigeration device according to claim 1, wherein,

the cold-conducting low-temperature heat pipe penetrates through the box body, and a heat-insulating material is arranged at the penetrating position of the box body.

7. A refrigeration device according to claim 1, wherein,

the diameter of the cold-conducting low-temperature heat pipe is smaller than or equal to a preset diameter.

8. A refrigeration device according to claim 7, wherein,

the plurality of cold-conducting low-temperature heat pipes are symmetrically arranged.

9. A refrigeration device according to claim 1, wherein,

the terminal heat exchangers are provided with a plurality of heat exchangers and are respectively connected with the cold-conducting low-temperature heat pipes.

10. The refrigeration appliance according to any one of claims 1 to 9 further comprising:

the fan is arranged on the outer side of the box body, and the blowing direction of the fan is limited to be towards the refrigerator.