CN212778131U

CN212778131U - Refrigerator with a door

Info

Publication number: CN212778131U
Application number: CN202020950375.5U
Authority: CN
Inventors: 刘山山; 宋向鹏; 戚斐斐; 刘建如; 崔展鹏
Original assignee: Qingdao Haier Refrigerator Co Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Haier Refrigerator Co Ltd; Haier Smart Home Co Ltd
Priority date: 2020-05-29
Filing date: 2020-05-29
Publication date: 2021-03-23
Anticipated expiration: 2030-05-29

Abstract

The utility model provides a refrigerator, which comprises a refrigerator body, wherein a first storage chamber is formed inside the refrigerator body, and the refrigerator also comprises an air supply device, a first evaporator and a second evaporator; the air supply device is arranged in the box body and comprises a first cooling cavity and a second cooling cavity; the first evaporator is arranged in the first cooling cavity, and the second evaporator is arranged in the second cooling cavity; the air supply device is configured to controllably promote the airflow of the first storage chamber to enter the first cooling cavity, and circularly flow back to the first storage chamber after exchanging heat with the first evaporator; and controllably causing the airflow of the first storage compartment to enter the second cooling cavity, and circularly flow back to the first storage compartment after exchanging heat with the second evaporator. Through first cooling chamber and second cooling chamber, set up first evaporimeter and second evaporimeter in two cooling chambeies, can avoid or reduce the mutual influence between first evaporimeter and the second evaporimeter.

Description

Refrigerator with a door

Technical Field

The utility model relates to a refrigeration field especially relates to a refrigerator.

Background

At present, the temperature range of the temperature-changing chamber of the refrigerator on the market is mostly adjusted between 8 ℃ and 18 ℃, and the overall design is more conventional. With the gradual improvement of living standard of people, the refrigerator with the temperature zone can not well meet the requirements of people, a high-end refrigerator which has a wider temperature range and more complete functions and can meet more requirements of users needs to be designed, the food is stored at a glass state below-40 ℃, the food nutritive value can be stored to the maximum extent, the market of the high-end user has the requirement on an ultralow temperature compartment (minus 40 ℃ to minus 60 ℃), and the user experience is grasped tightly for improving the satisfaction degree of the user. For this reason, the conventional cascade compression refrigeration system is generally composed of two separate refrigeration cycles, which are called a high-temperature stage refrigeration cycle (referred to as a high-temperature portion) and a low-temperature stage refrigeration cycle (referred to as a low-temperature portion), respectively. The high temperature portion uses a first refrigerant having a relatively high evaporation temperature, and the low temperature portion uses a second refrigerant having a relatively low evaporation temperature. And a condensing evaporator is adopted, which utilizes the cold energy produced by the first refrigerant in the high-temperature part to condense the second refrigerant vapor discharged by the compressor in the low-temperature part, thereby realizing the low temperature below minus 60 ℃. However, in the partial overlapping type compression refrigeration system in the prior art, the high-temperature stage refrigeration cycle loop is only used for supplying cold to the condenser of the low-temperature stage refrigeration cycle loop, so that the refrigeration efficiency of the overlapping type compression refrigeration system is low, and the conventional deep cooling refrigerator only has a single temperature function, so that the system efficiency is low.

SUMMERY OF THE UTILITY MODEL

In order to overcome at least one technical defect of current cryrogenic refrigerator, the utility model discloses an inventor has provided the first evaporimeter that utilizes high temperature system and the second evaporimeter of low temperature part all to the storing compartment cooling, realizes that the multi-temperature district compartment can reach extremely low temperature, also can set conventional warm area when not needing the ultra-low temperature simultaneously, satisfies the diversified demand of user. However, the inventor found that the first evaporator and the second evaporator are integrally provided, and the two evaporators have a certain degree of mutual influence during refrigeration, and based on this, the utility model provides a novel refrigerator.

The utility model provides a refrigerator, which comprises a refrigerator body, wherein a first storage chamber is formed inside the refrigerator body, and the refrigerator also comprises an air supply device, a first evaporator and a second evaporator;

the air supply device is arranged in the box body and comprises a first cooling cavity and a second cooling cavity;

the first evaporator is arranged in the first cooling cavity, and the second evaporator is arranged in the second cooling cavity; and is

The air supply device is configured to controllably promote the airflow of the first storage compartment to enter the first cooling cavity, and circularly flow back to the first storage compartment after exchanging heat with the first evaporator; and controllably causing the airflow of the first storage compartment to enter the second cooling cavity, and circularly flow back to the first storage compartment after exchanging heat with the second evaporator.

Optionally, the air supply device further comprises a first fan and a second fan;

the first fan is configured to be controlled to be started to promote airflow of the first storage compartment to enter the first cooling cavity and circulate back to the first storage compartment after heat exchange with the first evaporator;

the second fan is configured to be controlled to be started to promote airflow of the first storage compartment to enter the second cooling cavity and circulate the airflow back to the first storage compartment after the airflow exchanges heat with the second evaporator.

Optionally, the air supply device further comprises an air supply duct structure, and the first fan and the second fan both blow airflow to the first storage compartment through the air supply duct structure; and is

The air supply duct structure comprises two air inlets, at least one air supply outlet and a communication air duct, the two air inlets are respectively communicated with the first cooling cavity and the second cooling cavity, the communication air duct is communicated with the two air inlets and each air supply outlet, and each air supply outlet faces the first storage compartment;

the first fan is arranged in the first cooling cavity or at one air inlet, and the second fan is arranged in the second cooling cavity or at the other air inlet.

Optionally, the air supply device further comprises a return air duct structure, an inlet of the return air duct structure is connected to the first storage compartment, and an outlet of the return air duct structure is communicated with the first cooling cavity and the second cooling cavity.

Optionally, the refrigerator further includes a damper installed in the second cooling chamber or at an outlet of the second cooling chamber and at a downstream side of the second evaporator to close a passage between the second evaporator and the first storage compartment when the first evaporator operates.

Optionally, the first cooling cavity and the second cooling cavity are both arranged at the rear part of the first storage compartment, and

at least part of the space of the second cooling cavity is positioned behind the first cooling cavity; the second evaporator is positioned at the rear side of the first evaporator; the air door is arranged at the upper end of the space of the second cooling cavity, which is positioned right behind the first cooling cavity.

Optionally, the refrigerator further comprises a high-temperature stage refrigeration cycle loop and a low-temperature stage refrigeration cycle loop;

the high-temperature-stage refrigeration cycle circuit comprises an evaporation part and the first evaporator; the low-temperature-stage refrigeration cycle loop comprises a condensation part and the second evaporator, and the condensation part is thermally connected with the evaporation part.

Optionally, a second storage compartment is further formed inside the box body, and the high-temperature refrigeration cycle loop further includes a third evaporator, where the third evaporator is used for cooling the second storage compartment;

the third evaporator with the evaporation plant sets up in series, just high temperature level refrigeration cycle return circuit still includes the control valve, the import of first evaporator with an export intercommunication of control valve, the import of third evaporator with another export intercommunication of control valve, the export of first evaporator with the import intercommunication of third evaporator, the export of third evaporator with the import intercommunication of evaporation plant.

Optionally, a third storage compartment and a third cooling cavity are formed inside the box body; the high-temperature stage refrigeration cycle loop further comprises a fourth evaporator, the fourth evaporator is used for supplying cold to the third storage compartment, an inlet of the fourth evaporator is communicated with the other outlet of the control valve, and an outlet of the fourth evaporator is communicated with an inlet of the third evaporator;

the evaporation part and the condensation part are plate heat exchangers, and the plate heat exchangers and the third evaporator are arranged in the third cooling cavity.

Optionally, the low temperature stage refrigeration cycle loop further comprises a low temperature stage compressor and an expansion device, the expansion device comprising a pressure reducing valve and an expansion vessel; the inlet of the pressure reducing valve is arranged on a pipeline between the outlet of the second evaporator and the suction inlet of the low-temperature stage compressor, the inlet of the expansion container is communicated with the outlet of the pressure reducing valve, and the outlet of the expansion container is arranged on a pipeline between the discharge port of the low-temperature stage compressor and the inlet of the condensing part.

The utility model discloses a refrigerator through first cooling chamber and second cooling chamber, sets up first evaporimeter and second evaporimeter in two cooling intracavity, can avoid or reduce the influence each other between first evaporimeter and the second evaporimeter. Furthermore, two fans can be adopted to supply air respectively and independently.

Furthermore, when the ultralow temperature function is used, the load is large, the cold quantity demand is high, a second evaporator which is relatively large is adopted, cold air enters the second evaporator for circulation when normal temperature change refrigeration is reduced, cold quantity loss is caused, and an air door is arranged at the top of the second evaporator to reduce air leakage. Because the second evaporator is large and the temperature of the room is extremely low during low-temperature refrigeration, the wind-crossing influence of the first evaporator is not needed to be considered.

Further, a first evaporator is arranged in the high-temperature refrigeration circulating loop and used for supplying cold to the first storage compartment. And a second evaporator is arranged in the low-temperature refrigeration circulation loop and used for supplying cold to the first storage compartment. The first evaporator and the second evaporator can both supply cold to the first storage chamber, so that a single storage chamber of the refrigerator has a multi-temperature-zone function, even if the first storage chamber can obtain different refrigeration effects, different refrigeration requirements and storage requirements are met, the temperature zone range of the first storage chamber can be enlarged, namely, the refrigerator can have a deep cooling function and meet the energy-saving requirement of daily refrigeration.

Furthermore, the tail end of the third evaporator is provided with an evaporation part, namely, the tail end of the freezing evaporator is provided with a plate heat exchanger, so that the cold energy of the refrigerant can be fully utilized without adding a liquid storage bag, and the heat of the low-temperature chamber is transferred to the freezing chamber through the plate heat exchanger.

Furthermore, the arrangement positions of each evaporator and the evaporation part in the high-temperature refrigeration circulation loop can ensure the refrigeration efficiency of each evaporator during normal refrigeration, improve the energy efficiency of the refrigerator and have obvious energy-saving effect. That is to say, the refrigerator can ensure that the temperature of each room is controlled when the high-temperature refrigeration circulation loop operates independently, the aim of saving energy is achieved, and the deep cooling function of the refrigerator can be realized by utilizing the low-temperature refrigeration circulation loop.

Further, an expansion container is arranged at the low-temperature stage compressor, so that the low-temperature stage compressor is prevented from being damaged due to overlarge pressure difference when the low-temperature stage compressor is started, and meanwhile, a pressure retaining valve is arranged for maintaining the pressure difference for ensuring the pressure difference when the compressor is stopped. And when the freezing defrosting is set, the low-temperature stage compressor stops running, and the low-temperature stage compressor is started again when the temperature of the third evaporator reaches the starting temperature.

Further, when the first storage chamber is set to be at an ultralow temperature, the multi-temperature chamber is precooled to-18 ℃ through the high-temperature refrigeration circulation loop for reducing energy consumption, and then the low-temperature refrigeration circulation loop is opened to independently refrigerate the multi-temperature chamber.

The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.

Drawings

Some specific embodiments of the present invention will be described in detail hereinafter, by way of illustration and not by way of limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:

fig. 1 is a schematic front view of a refrigerator according to an embodiment of the present invention;

fig. 2 is a schematic side view of a refrigerator according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a refrigeration system in a refrigerator according to an embodiment of the present invention.

Detailed Description

Fig. 1 is a schematic front view of a refrigerator according to an embodiment of the present invention. As shown in fig. 1, and referring to fig. 2 and 3, an embodiment of the present invention provides a refrigerator, which may include a cabinet 20, a refrigeration system, and an air supply device. One or more storage compartments are formed in the box body 20, and the storage compartment may include one storage compartment, such as the first storage compartment 21. Alternatively, the storage compartment may comprise a plurality of storage compartments, such as a first storage compartment 21, a second storage compartment 22 and a third storage compartment 23. A refrigeration system may be provided within the cabinet 20, and the refrigeration system may include a first evaporator 35 and a second evaporator 44 for absorbing heat.

The air blowing device is disposed in the cabinet 20, and includes a first cooling chamber 51 and a second cooling chamber 52. The first evaporator 35 is disposed in the first cooling chamber 51, and the second evaporator 44 is disposed in the second cooling chamber 52. The air supply device is configured to controllably promote the airflow of the first storage compartment 21 to enter the first cooling cavity 51, and circularly flow back to the first storage compartment 21 after exchanging heat with the first evaporator 35; and controllably causes the air flow of the first storage compartment 21 to enter the second cooling cavity 52, to circulate back to the first storage compartment 21 after exchanging heat with the second evaporator 44. The utility model discloses a refrigerator through spaced apart first cooling chamber 51 and second cooling chamber 52, sets up first evaporator 35 and second evaporator 44 in two cooling chambers, can avoid or reduce the influence each other between first evaporator 35 and the second evaporator 44.

Further, as shown in fig. 2, the air supply device further includes a first fan 53 and a second fan 54. The first fan 53 is configured to be controllably activated to cause an airflow from the first compartment 21 to enter the first cooling chamber 51, circulate back to the first compartment 21 after exchanging heat 35 with the first evaporator. The second fan 54 is configured to be controllably activated to cause airflow from the first compartment 21 into the second cooling chamber 52 to circulate back to the first compartment 21 after heat exchange with the second evaporator 44. Two fans can be adopted to supply air respectively and independently.

In some embodiments of the present invention, the air supply device further includes an air supply duct structure 55, and the first fan 53 and the second fan 54 both blow an air flow to the first storage compartment 21 through the air supply duct structure 55. The air supply duct structure 55 includes two air inlets, at least one air supply outlet and a communication duct, the two air inlets are respectively communicated with the first cooling cavity 51 and the second cooling cavity 52, the communication duct is communicated with the two air inlets and each air supply outlet, and each air supply outlet faces the first storage compartment 21. The first fan 53 is disposed in the first cooling chamber 51 or at one air inlet, and the second fan 54 is disposed in the second cooling chamber 52 or at another air inlet. That is, the two fans utilize the same air supply duct structure 55 to supply air, so that the refrigerator is compact in structure and the components are fully utilized. Further, the air supply device further comprises a return air duct structure 56, an inlet of the return air duct structure 56 is connected to the first storage compartment 21, and an outlet of the return air duct structure 56 is communicated with the first cooling cavity 51 and the second cooling cavity 52.

For example, the first cooling cavity 51 and the second cooling cavity 52 are both provided at the rear portion of the first storage compartment 21. At least a part of the space of the second cooling chamber 52 is located rearward of the first cooling chamber 51. The second evaporator 44 is located at the rear side of the first evaporator 35. The air supply duct structure 55 may be disposed between the first storage compartment 21 and the first cooling chamber 51. The first fan 53 is disposed at an upper portion of the first cooling chamber 51. A portion of the second cooling chamber 52 may be located above the first cooling chamber 51, and the second fan 54 is installed above the first fan 53. The return air duct structure 56 is disposed below the supply air duct structure 55 and is communicated with both the lower end of the first cooling chamber 51 and the lower end of the second cooling chamber 52.

In some embodiments of the present invention, the refrigerator further comprises a damper 57 installed in the second cooling chamber 52 or at an outlet of the second cooling chamber 52 and at a downstream side of the second evaporator 44 to close a passage between the second evaporator 44 and the first storage compartment 21 when the first evaporator 35 is operated. Preferably, the damper 57 is provided at an upper end of the space of the second cooling chamber 52 directly behind the first cooling chamber 51. That is, the damper 57 is disposed between the second evaporator 44 and the second fan 54.

In some embodiments of the present invention, as shown in fig. 1-3, the refrigeration system includes a high temperature stage refrigeration cycle 30 and a low temperature stage refrigeration cycle 40, which may also be referred to as a cascade compression refrigeration system. The "high temperature" and the "low temperature" in the "high temperature stage refrigeration cycle circuit 30" and the "low temperature stage refrigeration cycle circuit 40" are relative, and the evaporation temperature of the refrigerant flowing through the high temperature stage refrigeration cycle circuit 30 is relatively higher than the evaporation temperature of the refrigerant flowing through the low temperature stage refrigeration cycle circuit 40.

The high-temperature-stage refrigeration cycle circuit 30 is configured to circulate a first refrigerant, and the first evaporator 35 and the evaporation unit for absorbing heat are provided therein. The first evaporator 35 and the evaporation portion serve to cause the first refrigerant flowing therethrough to absorb heat. The high temperature stage refrigeration cycle circuit 30 also includes a high temperature stage compressor 31 and a high temperature stage condensing device. The low-temperature-stage refrigeration cycle circuit 40 is for circulating the second refrigerant, and is provided therein with a condensing portion and the above-described second evaporator 44. The second evaporator 44 is used for promoting the second refrigerant flowing through the second evaporator to absorb heat and supplying cold to the first storage compartment 21. The low-temperature stage refrigeration cycle circuit 40 also includes a low-temperature stage compressor 41. The evaporation portion serves to cause the first refrigerant flowing therethrough to absorb heat of the second refrigerant flowing through the condensation portion within the low-temperature-stage refrigeration cycle circuit 40. The first refrigerant and the second refrigerant may be the same refrigerant, such as R600a, or different refrigerants.

The utility model discloses refrigerator, first evaporimeter 35 can be to the cooling of first storing compartment 21, second evaporimeter 44 also can be to the cooling of first storing compartment 21, can make the single storing compartment of refrigerator have the multi-temperature-zone function, even first storing compartment 21 can obtain different refrigeration effects, in order to satisfy different refrigeration demands, can enlarge the warm area scope of first storing compartment 21, that is to say can make the refrigerator both possess cryrogenic function, can satisfy daily cryogenic energy-conserving demand again. By arranging the first evaporator 35 and the second evaporator 44 in the two cooling chambers by means of the first cooling chamber 51 and the second cooling chamber 52, the mutual influence between the first evaporator 35 and the second evaporator 44 can be avoided or reduced.

The high-temperature-stage refrigeration cycle further comprises a third evaporator 36 and a fourth evaporator 37, wherein the third evaporator 36 is used for cooling the second storage compartment 22, and the fourth evaporator 37 is used for cooling the third storage compartment 23. In some embodiments of the present invention, the second storage compartment 22 and the first storage compartment 21 are disposed in parallel along the lateral extension direction of the refrigerator, and the third storage compartment 23 is disposed on the upper side of the second storage compartment 22 and the first storage compartment 21. In some embodiments of the present invention, the second storage compartment 22, the first storage compartment 21 and the third storage compartment 23 may be arranged in sequence from bottom to top. The second storage compartment 22 may be a freezing compartment, the first storage compartment 21 may be a multifunctional compartment having multiple temperature zones, and the third storage compartment 23 may be a refrigerating compartment. The arrangement can ensure that the compartment layout is more reasonable and the corresponding articles can be more conveniently stored and taken. In some optional embodiments of the present invention, the high-temperature stage refrigeration cycle does not have the fourth evaporator 37, and the third evaporator 36 can supply cold to the second storage compartment 22 and the third storage compartment 23 through the air duct.

In some embodiments of the present invention, the high temperature stage refrigeration cycle loop 30 further includes a control valve 33. The inlet of the control valve 33 may be in communication with the inlet of the high temperature stage condensing unit. The control valve 33 has a first outlet and a second outlet, with the inlet of the first evaporator 35 communicating with the first outlet. The inlet of the third evaporator 36 communicates with the second outlet. The outlet of the first evaporator 35 communicates with the inlet of the third evaporator 36, and the outlet of the third evaporator 36 communicates with the inlet of the evaporation portion. The control valve 33 may be a switching valve. Further, the control valve 33 also has a third outlet, and an inlet of the fourth evaporator 37 communicates with the third outlet, and an outlet of the fourth evaporator 37 communicates with an inlet of the third evaporator 36. The arrangement positions of each evaporator and the evaporation part in the high-temperature refrigeration circulation loop can ensure the refrigeration efficiency of each evaporator during conventional refrigeration, improve the energy efficiency of the refrigerator and have obvious energy-saving effect. That is, the refrigerator can ensure temperature control of each compartment when the high-temperature refrigeration cycle circuit 30 operates alone, achieve the purpose of energy saving, and can realize the deep cooling function of the refrigerator by using the low-temperature refrigeration cycle circuit 40.

In some embodiments of the present invention, a first throttle device 343 is disposed between the inlet and the first outlet of the first evaporator 35. A second throttle device 342 is provided between the inlet and the second outlet of the third evaporator 36. A third throttling means 341 is provided between the inlet and the third outlet of the fourth evaporator 37. In alternative embodiments, a total restriction may be provided at the inlet of the control valve 33. Further, the first throttling means 343, the second throttling means 342 and the third throttling means 341 may each be a capillary tube. Alternatively, the first throttling device 343, the second throttling device 342 and the third throttling device 341 may be electromagnetic expansion valves. The control valve 33 may now be selected as a one-in-many flow divider valve.

In some embodiments of the present invention, the high temperature stage condensing device may include a condenser 321 and a dew prevention pipe 322. The inlet of the high-temperature stage condensing device is communicated with the outlet of the high-temperature stage compressor 31, and the outlet of the evaporation part is communicated with the inlet of the high-temperature stage compressor 31. The low temperature stage refrigeration cycle circuit 40 further includes a low temperature stage throttling device 43. The outlet of the low-temperature stage compressor 41 is communicated with the inlet of the condensing part, the outlet of the condensing part is communicated with the low-temperature stage throttling device 43, the outlet of the low-temperature stage throttling device 43 is communicated with the inlet of the second evaporator 44, and the outlet of the second evaporator 44 is communicated with the inlet of the low-temperature stage compressor 41. Optionally, the low-temperature stage refrigeration cycle 40 further includes a low-temperature stage condensation device, an outlet of the low-temperature stage compressor 41 is communicated with an inlet of the low-temperature stage condensation device, and an outlet of the low-temperature stage condensation device is communicated with an inlet of the condensation portion.

In some embodiments of the present invention, the cabinet 20 is further formed with a third cooling chamber for arranging a third evaporator 36 at a position corresponding to the rear side of the second storage compartment 22. The condensing portion and the evaporating portion may form a condensing evaporator. The condensing evaporator may be a double pipe heat exchanger. Alternatively, the condensation section and the evaporation section may be two copper tubes attached to each other. The two copper pipes are arranged in a mutual attaching mode. The contact part between the two copper pipes can be fixed by tin soldering to strengthen the heat transfer. The two copper pipes can be wrapped with aluminum foils. In other alternative embodiments, the condensing portion and the evaporating portion may share heat exchange fins. In some preferred embodiments, the evaporation section and the condensation section are plate heat exchangers 60. The evaporation part and the condensation part are arranged in the third cooling cavity. Of course, the evaporation portion and the condensation portion may be provided at other positions of the refrigerator.

In some embodiments of the present invention, the low temperature stage refrigeration cycle further comprises an expansion device comprising a pressure relief valve and an expansion vessel. An inlet of the pressure reducing valve is provided in a pipeline between an outlet of the second evaporator 44 and a suction port of the low-temperature stage compressor 41, an inlet of the expansion vessel is communicated with an outlet of the pressure reducing valve, and an outlet of the expansion vessel is provided in a pipeline between a discharge port of the low-temperature stage compressor 41 and an inlet of the condensing portion. An expansion container is arranged at the low-temperature stage compressor 41, so that the low-temperature stage compressor 41 is prevented from being damaged due to overlarge pressure difference when the low-temperature stage compressor 41 is started, and meanwhile, a pressure retaining valve is arranged for maintaining the pressure difference to ensure the pressure difference when the compressor is stopped. When the defrosting of the refrigerant is set, the low-temperature stage compressor 41 is stopped, and the low-temperature stage compressor 41 is restarted when the temperature of the third evaporator 36 reaches the start-up temperature. The rear side of the bottom of the box 20 is provided with a compressor bin 24, and the high-temperature stage compressor 31, part or all of the high-temperature stage condensing device (such as the condenser 321) and the low-temperature stage compressor 41 are all arranged in the compressor bin.

Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been shown and described in detail herein, many other variations and modifications can be made, consistent with the principles of the invention, which are directly determined or derived from the disclosure herein, without departing from the spirit and scope of the invention. Accordingly, the scope of the present invention should be understood and interpreted to cover all such other variations or modifications.

Claims

1. A refrigerator comprises a refrigerator body, wherein a first storage chamber is formed in the refrigerator body, and the refrigerator is characterized by further comprising an air supply device, a first evaporator and a second evaporator;

2. The refrigerator according to claim 1,

the air supply device also comprises a first fan and a second fan;

3. The refrigerator according to claim 2,

the air supply device also comprises an air supply duct structure, and the first fan and the second fan both blow airflow to the first storage compartment through the air supply duct structure; and is

4. The refrigerator according to claim 1,

the air supply device further comprises a return air duct structure, an inlet of the return air duct structure is connected to the first storage compartment, and an outlet of the return air duct structure is communicated with the first cooling cavity and the second cooling cavity.

5. The refrigerator of claim 1, further comprising a damper installed in the second cooling chamber or at an outlet of the second cooling chamber and at a downstream side of the second evaporator to close a passage between the second evaporator and the first locker room when the first evaporator is operated.

6. The refrigerator according to claim 5,

the first cooling cavity and the second cooling cavity are arranged at the rear part of the first storage chamber and are used for cooling

7. The refrigerator of claim 1, further comprising a high temperature stage refrigeration cycle circuit and a low temperature stage refrigeration cycle circuit;

8. The refrigerator according to claim 7,

a second storage chamber is formed in the box body, the high-temperature refrigeration cycle loop further comprises a third evaporator, and the third evaporator is used for supplying cold to the second storage chamber;

9. The refrigerator according to claim 8,

a third storage compartment and a third cooling cavity are formed in the box body; the high-temperature stage refrigeration cycle loop further comprises a fourth evaporator, the fourth evaporator is used for supplying cold to the third storage compartment, an inlet of the fourth evaporator is communicated with the other outlet of the control valve, and an outlet of the fourth evaporator is communicated with an inlet of the third evaporator;

10. The refrigerator according to claim 7,

the low-temperature stage refrigeration cycle loop further comprises a low-temperature stage compressor and an expansion device, wherein the expansion device comprises a pressure reducing valve and an expansion container; the inlet of the pressure reducing valve is arranged on a pipeline between the outlet of the second evaporator and the suction inlet of the low-temperature stage compressor, the inlet of the expansion container is communicated with the outlet of the pressure reducing valve, and the outlet of the expansion container is arranged on a pipeline between the discharge port of the low-temperature stage compressor and the inlet of the condensing part.