CN109883126B

CN109883126B - Refrigerating system of air-cooled refrigerator and air-cooled refrigerator

Info

Publication number: CN109883126B
Application number: CN201910216359.5A
Authority: CN
Inventors: 肖遥; 刘祥; 汪士雄
Original assignee: Hefei Hualing Co Ltd; Midea Group Co Ltd; Hefei Midea Refrigerator Co Ltd
Current assignee: Hefei Hualing Co Ltd; Midea Group Co Ltd; Hefei Midea Refrigerator Co Ltd
Priority date: 2019-03-19
Filing date: 2019-03-19
Publication date: 2021-08-27
Anticipated expiration: 2039-03-19
Also published as: CN109883126A

Abstract

The invention discloses a refrigerating system of an air-cooled refrigerator and the air-cooled refrigerator, wherein the refrigerating system comprises a main air duct, and an evaporator is arranged in the main air duct; the sub air duct is independent from the main air duct, and is communicated with the refrigeration chamber; the heat exchange structure comprises a main air cavity and a sub air cavity which are mutually independent, the main air cavity is communicated with the main air channel, the sub air cavity is communicated with the sub air channel, a heat exchange piece is arranged between the main air cavity and the sub air cavity, and the main air cavity and the sub air cavity are subjected to heat exchange through the heat exchange piece. In the refrigerating system of the air-cooled refrigerator, the main air duct and the sub air ducts are used as independent air ducts to perform circulating operation, so that moisture in air in the refrigerating chamber cannot be condensed on the evaporator to cause moisture loss, sufficient moisture in the air in the refrigerating chamber is kept, the problem of air drying of vegetables and fruits stored in the refrigerating chamber is solved, and the refrigerating system has the advantages of high space utilization rate and low energy consumption.

Description

Refrigerating system of air-cooled refrigerator and air-cooled refrigerator

Technical Field

The invention relates to the technical field of refrigeration equipment, in particular to a refrigeration system of an air-cooled refrigerator and the air-cooled refrigerator.

Background

At present, the air-cooled refrigerator becomes a mainstream product of a household refrigerator, and compared with the traditional direct-cooled refrigerator, the air-cooled refrigerator has the advantages of rapid refrigeration, uniform temperature, automatic defrosting and the like. However, due to the inherent characteristics of the automatic defrosting and air duct circulating system of the air-cooled refrigerator, water vapor in the air inside the refrigerator is continuously condensed on the evaporator and is discharged outside the refrigerator through the defrosting process, so that food in the refrigerator, particularly vegetables and fruits and the like are always in a dry and water-loss environment, and the problem that the food stored in the air-cooled refrigerator is easy to air-dry is caused.

Specifically, as shown in fig. 1, in the refrigeration system of the conventional air-cooled refrigerator, hot air (as opposed to cold air described later) in each compartment (including the refrigerating compartment, the temperature-changing compartment, and the freezing compartment) is delivered to the evaporator through the air duct, and is heat-exchanged in contact with the evaporator, whereby the hot air becomes cold air, and at the same time, water vapor in the hot air is condensed into ice on the evaporator and is trapped. Cold air generated by heat exchange is conveyed back to each chamber through the air channels to refrigerate foods and the like, the temperature of the refrigerated air is increased to become hot air, and the hot air is conveyed to the evaporator through the related air channels to complete a heat exchange cycle. The long-term heat exchange circulation makes a large amount of ice condense on the evaporator, when the ice gathers to a certain extent, the refrigerator starts an automatic defrosting mode, the gathered ice is melted into water through modes of high-power heating or accelerating air circulation and the like, and the water is discharged out of the refrigerator through a special drainage system. The process causes the moisture in the air in each chamber to be reduced continuously, although the air is exchanged in the forms of opening the door of the refrigerator and the like, the supplemented moisture is not enough to make up the moisture taken away by the system in a circulating way, so that the problem that the food stored in the existing air-cooled refrigerator is easy to air-dry is caused. Meanwhile, the regular heating and defrosting also bring energy consumption burden to the refrigerator, and the power consumption level of the whole refrigerator is improved.

In order to solve the problem that food stored in an air-cooled refrigerator is easy to air-dry, the air-cooled refrigerator is solved by adopting the following two technical schemes in the prior art: the first scheme is as follows: a sealed space, such as a sealed drawer, is independently arranged in a refrigerator compartment (particularly a refrigerating compartment), so that the air exchange between the sealed drawer and the outside is reduced, the loss of water vapor in the sealed drawer is reduced, the humidity in a local space is kept, and the moisturizing effect is achieved. Scheme II: a special humidifying device is additionally arranged in the refrigerator chamber or the independent moisturizing space and is used for balancing the loss of water caused by the operation of the system, so that the moisturizing effect is achieved.

However, the first solution has the following disadvantages: the space utilization rate is not high, in order to construct a new partitioned space, the waste of the whole storage space in the refrigerator is caused, and meanwhile, only the specified space is used for storing the food needing to be moisturized; the moisture retention effect is not good, and the air exchange can cause water vapor loss when the sealed space is opened and closed and food is stored and taken. At the same time, the cost is increased by adding mechanisms and related functional modules for improving the sealing effect. The second scheme has the following disadvantages: as a humidifying device is added, the refrigerator structure becomes complicated, the actual storage space becomes small, the product cost rises, and the after-sales maintenance difficulty is increased; as the interior of the refrigerator is forcedly humidified, the running load of a refrigerator system such as an evaporator, a compressor and the like is increased, the energy consumption of the whole refrigerator is improved, and the service life of the refrigerator is also reduced.

Disclosure of Invention

The invention mainly aims to provide a refrigerating system of an air-cooled refrigerator and the air-cooled refrigerator, and aims to solve the problems of low space utilization rate, high energy consumption and the like in the technical scheme of avoiding air drying of food in the air-cooled refrigerator in the prior art by independently arranging a sealed space or adding a special humidifying device in a refrigerator chamber.

In order to achieve the above object, the present invention provides a refrigeration system of an air-cooled refrigerator, comprising:

the main air duct is internally provided with an evaporator;

the sub air duct is independent from the main air duct, and is communicated with the refrigeration chamber;

the heat exchange structure comprises a main air cavity and a sub air cavity which are mutually independent, the main air cavity is communicated with the main air channel, the sub air cavity is communicated with the sub air channel, a heat exchange piece is arranged between the main air cavity and the sub air cavity, and the main air cavity and the sub air cavity are subjected to heat exchange through the heat exchange piece. .

Preferably, the heat exchange structure comprises:

the heat conduction inner pipe is internally provided with the main air cavity;

the heat-conducting inner pipe is sleeved outside the heat-conducting inner pipe, the sub-air cavity is formed between the heat-conducting inner pipe and the heat-insulating outer pipe, and the heat-conducting inner pipe is the heat exchange piece.

Preferably, the number of the refrigerating compartments is multiple, the number of the sub-air ducts is multiple, and the plurality of sub-air ducts are arranged independently;

each refrigerating compartment is communicated with at least one sub-air duct, the number of the sub-air cavities is multiple, the plurality of sub-air cavities are arranged independently, and each sub-air duct is communicated with at least one sub-air cavity.

Preferably, the number of the sub-air cavities and the number of the sub-air ducts are equal to the number of the refrigerating chambers, the plurality of sub-air cavities are arranged in one-to-one correspondence with the plurality of sub-air ducts, and the plurality of sub-air ducts are arranged in one-to-one correspondence with the plurality of refrigerating chambers.

Preferably, the heat exchange structure comprises a plurality of valve leaflets arranged at intervals, each valve leaflet is connected between the heat-conducting inner pipe and the heat-insulating outer pipe, and one sub-air cavity is formed between any two adjacent valve leaflets.

Preferably, the heat-conducting inner pipe and the valve leaflets are both made of rigid materials, and the heat-insulating outer pipe is made of elastic materials;

the first end of the valve leaf is fixed on the inner wall of the heat insulation outer pipe, and the second end of the valve leaf is hinged to the outer wall of the heat conduction inner pipe, so that the valve leaf can rotate relative to the heat conduction inner pipe and drive the heat insulation outer pipe to be close to or far away from the heat conduction inner pipe.

Preferably, the heat-conducting inner pipe, the heat-insulating outer pipe and the valve leaflets are all made of rigid materials;

the heat conduction inner pipe and the heat insulation outer pipe are coaxially arranged, the first end of the valve leaf is lapped on the inner wall of the heat insulation outer pipe, and the second end of the valve leaf is lapped on the outer wall of the heat conduction inner pipe, so that the valve leaf can slide relative to the heat conduction inner pipe and the heat insulation outer pipe.

Preferably, the heat conduction inner pipe and the heat insulation outer pipe are made of rigid materials;

the first end of the valve leaf is fixed on the inner wall of the heat insulation outer pipe, the second end of the valve leaf is fixed on the outer wall of the heat conduction inner pipe, and the valve leaf is made of elastic materials, so that the valve leaf can move in a telescopic mode and drive the heat conduction inner pipe to move to any position in the heat insulation outer pipe.

Preferably, the valve leaflets are arc valve leaflets, and the convex surfaces of the arc valve leaflets face the concave surfaces of the other adjacent valve leaflets.

The invention also provides an air-cooled refrigerator which comprises the refrigerating system of the air-cooled refrigerator.

In the refrigerating system of the air-cooled refrigerator, the main air duct and the sub air ducts are both used as an independent air duct for circulating operation, air in a refrigerating chamber does not need to enter the main air duct to exchange gas with gas in the main air duct, but cold air which is refrigerated by the evaporator and enters the main air duct is subjected to non-contact heat exchange through the sub air ducts and the sub air chambers, so that moisture in the air in the refrigerating chamber cannot be condensed on the evaporator to cause moisture loss, sufficient moisture in the air in the refrigerating chamber is kept, and the problem of air drying of vegetables and fruits stored in the refrigerating chamber is solved. And, because the moisture in the indoor air of refrigeration room can not condense on the evaporimeter, the condition of frosting of evaporimeter can significantly reduce or disappear to the defrosting frequency that has significantly reduced the evaporimeter or need not defrost, and then the energy resource consumption of the whole refrigerator that significantly reduces, simultaneously, for the evaporimeter that often frosts, the evaporimeter that frosts less or does not frost also improves greatly work efficiency, has further reduced the energy resource consumption of whole refrigerator, the life of extension refrigerator.

Compared with the technical scheme that food air drying is avoided by independently arranging a sealed space or adding a special humidifying device in a refrigerator chamber in the prior art, the refrigerating system of the air-cooled refrigerator does not need to be independently provided with the sealed space or add the special humidifying device, so that the effective use space of the refrigerator is not occupied, the space utilization rate is high, the functional structure of the original refrigerator is reserved to a large extent, only the air duct system of the original refrigerator is changed into the main air duct and the sub air duct which are mutually independent, and the non-contact heat exchange of cold air in the main air duct and hot air in the sub air duct is realized through the heat exchange structure.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic diagram of a refrigeration system of a prior art air-cooled refrigerator;

FIG. 2 is a schematic view of a refrigeration system of an air-cooled refrigerator according to an embodiment of the present invention;

FIG. 3 is a schematic perspective view of a heat exchange structure according to an embodiment of the present invention;

FIG. 4 is a schematic front view of a heat exchange structure according to an embodiment of the present invention;

FIG. 5 is a schematic front view of a heat exchange structure according to another embodiment of the present invention;

fig. 6 is a schematic front view of a heat exchange structure according to another embodiment of the present invention.

The reference numbers illustrate:

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The invention provides a refrigerating system of an air-cooled refrigerator.

As shown in fig. 2 and 3, in this embodiment, the cooling system of the air-cooled refrigerator includes a main air duct 10 and a sub-air duct 20 that are independent of each other, the sub-air duct 20 communicates with the cooling compartment 30, and hot air in the cooling compartment 30 can enter the sub-air duct 20. Be provided with evaporimeter 11 in the main wind channel 10, evaporimeter 11 can refrigerate the air in the main wind channel 10 and become cold wind, refrigerating system still includes heat transfer structure 40, heat transfer structure 40 includes mutually independent main wind chamber 401 and sub-wind chamber 402, main wind chamber 401 and main wind channel 10 intercommunication, sub-wind chamber 402 and sub-wind channel 20 intercommunication, be provided with the heat transfer piece between main wind chamber 401 and the sub-wind chamber 402, main wind chamber 401 and sub-wind chamber 402 carry out the heat exchange through the heat transfer piece.

Specifically, the refrigerating compartment 30 of the present embodiment includes a refrigerating compartment, a temperature-changing compartment, and a freezing compartment, and foods such as vegetables and fruits may be stored in the refrigerating compartment 30. In the embodiment, the evaporator 11 in the main air duct 10 cools the air in the main air duct 10 to change the cooled air into cold air, the cold air passes through the main air cavity 401 of the heat exchange structure 40, the hot air entering the refrigeration compartment 30 in the sub air duct 20 passes through the sub air cavity 402 of the heat exchange structure 40, after the cold air in the main air cavity 401 and the hot air in the sub air cavity 402 exchange heat by using the heat exchange member, the hot air in the sub air cavity 402 changes into the cold air and enters the sub air duct 20 and the refrigeration compartment 30 communicated with the sub air duct 20, the refrigeration compartment 30 is refrigerated, the cold air after being refrigerated changes into the hot air and then enters the sub air duct 20, and passes through the sub air cavity 402 of the heat exchange structure 40, and then the circulation is performed according to the above manner, so that the circulation refrigeration process of the refrigeration compartment 30 is realized, and the requirement of the cold quantity of the refrigeration compartment 30 is met. And after the cold air in the main air cavity 401 and the hot air in the sub air cavity 402 exchange heat by the heat exchange member, the cold air in the main air cavity 401 is changed into hot air and enters the main air duct 10, is changed into cold air after being cooled by the evaporator 11, enters the main air cavity 401 of the heat exchange structure 40, and then circulates according to the mode.

In the refrigeration system of the air-cooled refrigerator of this embodiment, the main air duct 10 and the sub air duct 20 both operate as an independent air duct in a circulating manner, the main air duct 10 is not directly butted with the sub air duct 20 and the refrigerating chamber 30, that is, the air in the refrigerating chamber 30 does not need to enter the main air duct 10 to exchange gas with the air in the main air duct 10, but does not exchange non-contact heat with the cold air which is refrigerated by the evaporator 11 and enters the main air chamber 401 through the sub air duct 20 and the sub air chamber 402, so that the moisture in the air in the refrigerating chamber 30 is not condensed on the evaporator 11 to cause moisture loss, sufficient moisture in the air in the refrigerating chamber 30 is maintained, and the problem of air drying of vegetables and fruits stored in the refrigerating chamber 30 is prevented. Moreover, because moisture in the air in the refrigeration compartment 30 cannot condense on the evaporator 11, the frosting condition of the evaporator 11 can be greatly reduced or eliminated, so that the defrosting frequency of the evaporator 11 is greatly reduced or defrosting is not needed, and further the energy consumption of the whole refrigerator is greatly reduced.

Compared with the technical scheme of avoiding food air drying by independently arranging a sealing space or adding a special humidifying device in a refrigerator chamber in the prior art, the refrigerating system of the air-cooled refrigerator does not need to independently arrange the sealing space or increase the special humidifying device, so that the effective use space of the refrigerator does not need to be occupied, the space utilization rate is high, the functional structure of the original refrigerator is reserved to a larger extent, only the air duct system of the original refrigerator is changed into the main air duct 10 and the sub air duct 20 which are mutually independent, and the non-contact heat exchange of cold air in the main air duct 10 and hot air in the sub air duct 20 is realized through the heat exchange structure 40.

In this embodiment, the heat exchange structure 40 includes a heat-conducting inner tube 41 and a heat-insulating outer tube 42 sleeved outside the heat-conducting inner tube 41, a main air cavity 401 is formed in the heat-conducting inner tube 41, an auxiliary air cavity 402 is formed between the heat-conducting inner tube 41 and the heat-insulating outer tube 42, and the heat-conducting inner tube 41 is a heat exchange member. The heat conducting inner tube 41 and the heat insulating outer tube 42 of the present embodiment are preferably circular tubes, the heat conducting inner tube 41 is a good heat conductor, so as to facilitate heat exchange between the hot air in the sub-air cavity 402 and the cold air in the main air cavity 401, and the heat insulating outer tube 42 is a bad heat conductor, so as to avoid affecting the temperature of other areas near the heat exchanging structure 40.

In this embodiment, the number of the cooling compartments 30 is plural, the number of the sub-ducts 20 is plural, and the plurality of sub-ducts 20 are arranged independently of each other; each refrigeration compartment 30 is communicated with at least one sub-air duct 20, the number of the sub-air cavities 402 is multiple, the plurality of sub-air cavities 402 are arranged independently, and each sub-air duct 20 is communicated with at least one sub-air cavity 402. According to the difference of refrigeration demands, one refrigeration chamber 30 can be refrigerated through one sub-air duct 20 or a plurality of sub-air ducts 20, and hot air in each sub-air duct 20 can exchange heat with cold air in the main air cavity 401 through one sub-air cavity 402 or a plurality of sub-air cavities 402, so that the refrigeration chamber is flexible and changeable and different refrigeration demands of a plurality of refrigeration chambers 30 are met. Preferably, in this embodiment, the number of the sub-air cavities 402 and the number of the sub-air ducts 20 are both equal to the number of the refrigeration compartments 30, the plurality of sub-air cavities 402 are arranged in one-to-one correspondence with the plurality of sub-air ducts 20, and the plurality of sub-air ducts 20 are arranged in one-to-one correspondence with the plurality of refrigeration compartments 30. As shown in fig. 3, when the plurality of refrigerating compartments 30 of the present embodiment are a refrigerating compartment, a temperature-changing compartment, and a freezing compartment, respectively, the number of the sub-ducts 20 is three, the three sub-ducts 20 are independently provided, and the three sub-ducts 20 correspond to the refrigerating compartment, the temperature-changing compartment, and the freezing compartment, respectively. The number of the sub-air cavities 402 is also three, and the three sub-air cavities 402 and the three sub-air ducts 20 are arranged in a one-to-one correspondence manner, so that each refrigerating chamber 30 is provided with an independent air duct circulating system, the accurate temperature control and function customization of each chamber are realized, and the problem of tainting of different foods among the refrigerating chambers 30 is also solved.

As shown in fig. 3, the heat exchanging structure 40 includes a plurality of valve leaflets 43 uniformly spaced, each valve leaflet 43 is connected between the inner heat conducting pipe 41 and the outer heat insulating pipe 42, and a sub-air cavity 402 is formed between any two adjacent valve leaflets 43. Specifically, the heat exchange structure 40 of the present embodiment includes three leaflets 43 arranged at intervals, one end of each leaflet 43 is connected to the outer wall of the heat conduction inner tube 41, and the other end of each leaflet 43 is connected to the inner wall of the heat insulation outer tube 42, so that an independent sub-air cavity 402 is formed between any two adjacent leaflets 43, and the heat exchange structure is simple in structure and easy to manufacture.

As shown in fig. 4, in an embodiment, the inner heat-conducting tube 41 and the leaflets 43 are made of rigid materials, the outer heat-insulating tube 42 is made of elastic materials, and the inner heat-conducting tube 41, the leaflets 43 and the outer heat-insulating tube 42 can be made of materials in the prior art, for example, the inner heat-conducting tube 41 can be made of metal with high heat conductivity coefficient in the prior art, and the outer heat-insulating tube 42 can be made of rubber with low heat conductivity coefficient in the prior art. In order to avoid the interference between the sub-air cavities 402, the leaflets 43 may be made of a metal with a low thermal conductivity as in the prior art. The first end of the valve leaf 43 is fixed on the inner wall of the heat insulation outer tube 42, and the second end of the valve leaf 43 is hinged on the outer wall of the heat conduction inner tube 41, so that the valve leaf 43 can rotate relative to the heat conduction inner tube 41 and drive the heat insulation outer tube 42 to approach or leave the heat conduction inner tube 41. When the leaflet 43 rotates relative to the heat-conducting inner tube 41, because the heat-insulating outer tube 42 has elasticity, the first end of the leaflet 43 can drive the heat-insulating outer tube 42 to move telescopically, and further drive the heat-insulating outer tube 42 to approach or leave the heat-conducting inner tube 41, so as to reduce or enlarge the space of the corresponding sub-air cavity 402, and meet different refrigeration requirements.

In another embodiment, as shown in fig. 5, the inner heat-conducting tube 41, the outer heat-insulating tube 42 and the leaflets 43 are made of rigid materials, and the inner heat-conducting tube 41, the leaflets 43 and the outer heat-insulating tube 42 can be made of materials known in the art. The first end of the leaflet 43 is lapped on the inner wall of the heat insulation outer pipe 42, and the second end of the leaflet 43 is lapped on the outer wall of the heat conduction inner pipe 41, so that the leaflet 43 can slide relative to the heat conduction inner pipe 41 and the heat insulation outer pipe 42. The heat conduction inner pipe 41 and the heat insulation outer pipe 42 are coaxially arranged, so that the sliding of the valve blades 43 is facilitated. When the valve leaflets 43 slide relative to the heat-conducting inner tube 41 and the heat-insulating outer tube 42, the first ends of the valve leaflets 43 are always lapped on the inner wall of the heat-insulating outer tube 42, and the second ends of the valve leaflets 43 are always lapped on the outer wall of the heat-conducting inner tube 41, so that the sub air cavities 402 do not interfere with each other. As the leaflets 43 slide, the space in the respective sub-plenum 402 increases or decreases to meet different cooling needs.

As shown in fig. 6, in another embodiment, the heat-conducting inner tube 41 and the heat-insulating outer tube 42 are both made of rigid material, the first end of the leaflet 43 is fixed on the inner wall of the heat-insulating outer tube 42, the second end of the leaflet 43 is fixed on the outer wall of the heat-conducting inner tube 41, and the leaflet 43 is made of elastic material, so that the leaflet 43 can move telescopically and drive the heat-conducting inner tube 41 to move to any position in the heat-insulating outer tube 42. The thermally conductive inner tube 41, the leaflets 43, and the thermally insulating outer tube 42 can be made of materials known in the art. Because the valve leaflets 43 have elasticity, in the process of extension and retraction of each valve leaflet 43, the other valve leaflets 43 are matched to drive the heat-conducting inner pipe 41 to move to any position in the heat-insulating outer pipe 42, and along with the movement of the heat-conducting inner pipe 41, the space of the corresponding sub-air cavity 402 is increased or reduced, so that different refrigeration requirements are met.

Preferably, the valve leaflet 43 of the present invention is an arc valve leaflet, the convex surface of the arc valve leaflet faces the concave surface of another adjacent arc valve leaflet, that is, the bending direction of each valve leaflet 43 is the same, so that the hot air in the sub-air duct 20 can smoothly enter the sub-air chamber 402.

The invention also provides an air-cooled refrigerator which comprises the refrigerating system of the air-cooled refrigerator. Since the air-cooled refrigerator adopts all technical schemes of all the embodiments, at least all the beneficial effects brought by the technical schemes of the embodiments are achieved, and detailed description is omitted.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A refrigeration system for an air-cooled refrigerator, said refrigeration system comprising:

the main air duct is internally provided with an evaporator;

the sub air duct is independent from the main air duct, the sub air duct is communicated with the refrigeration chamber, and the main air duct is separated from the refrigeration chamber;

the heat exchange structure comprises a main air cavity and a sub air cavity which are mutually independent, and the main air cavity is communicated with the main air channel to form an independent air channel circulating system separated from the refrigerating chamber; the sub-air cavity is communicated with the sub-air channel to form another independent air channel circulating system communicated with the refrigerating chamber, a heat exchange piece is arranged between the main air cavity and the sub-air cavity, and the main air cavity and the sub-air cavity exchange heat through the heat exchange piece so that non-contact heat exchange is carried out between the two air channel circulating systems.

2. The cooling system of an air-cooled refrigerator according to claim 1, wherein the heat exchanging structure comprises:

the heat conduction inner pipe is internally provided with the main air cavity;

3. The cooling system of an air-cooled refrigerator according to claim 2,

the number of the refrigerating chambers is multiple, the number of the sub-air ducts is multiple, and the plurality of sub-air ducts are arranged independently;

4. The cooling system of the air-cooled refrigerator according to claim 3, wherein the number of the sub-air cavities and the number of the sub-air ducts are equal to the number of the cooling compartments, a plurality of the sub-air cavities are arranged in one-to-one correspondence with a plurality of the sub-air ducts, and a plurality of the sub-air ducts are arranged in one-to-one correspondence with a plurality of the cooling compartments.

5. The cooling system of an air-cooled refrigerator according to claim 3, wherein the heat exchanging structure comprises a plurality of spaced apart leaflets, each leaflet is connected between the inner heat conducting tube and the outer heat insulating tube, and one of the sub-air cavities is formed between any two adjacent leaflets.

6. The cooling system of an air-cooled refrigerator according to claim 5,

the heat conduction inner pipe and the valve blades are both made of rigid materials, and the heat insulation outer pipe is made of elastic materials;

7. The cooling system of an air-cooled refrigerator according to claim 5,

the heat conduction inner pipe, the heat insulation outer pipe and the valve leaf are all made of rigid materials;

8. The cooling system of an air-cooled refrigerator according to claim 5,

the heat conduction inner pipe and the heat insulation outer pipe are made of rigid materials;

9. The refrigeration system of the air-cooled refrigerator as claimed in any one of claims 5 to 8, wherein the valve leaf is an arc-shaped valve leaf, and the convex surface of the arc-shaped valve leaf faces the concave surface of another adjacent valve leaf.

10. An air-cooled refrigerator characterized in that it comprises the refrigerating system of the air-cooled refrigerator according to any one of claims 1 to 9.