Refrigerator

Abstract

The present invention provides a refrigerator, which includes a box body. A first storage compartment and a second storage compartment are formed inside the box body. The refrigerator further includes a high-temperature stage refrigeration cycle circuit and a low-temperature stage refrigeration cycle circuit. The high-temperature stage refrigeration cycle circuit includes a control valve, as well as a first evaporator, a second evaporator and an evaporation section. The first evaporator is used for cooling the first storage compartment, and the second evaporator is used for cooling the second storage compartment. The control valve has a first outlet and a second outlet. The inlet of the first evaporator is communicated with the first outlet. The inlet of the second evaporator is communicated with the second outlet. And the outlet of the second evaporator is communicated with the inlet of the evaporation section, and the outlet of the evaporation section is communicated with the inlet of the first evaporator. The low-temperature stage refrigeration cycle circuit includes a condensation section and a third evaporator. The condensation section is thermally connected to the evaporation section, and the third evaporator is used for cooling the second storage compartment. It can supply cold to multiple storage compartments of the refrigerator, and enables the refrigerator to have storage compartments with multiple temperature zones and multiple functions of deep cooling and conventional refrigeration.

Description

Technical Field

[0001] The present invention relates to the field of refrigerated storage, and particularly to a refrigerator. Background Art

[0002] Currently, the temperature range of the variable-temperature compartment in refrigerators on the market is mostly adjusted between 8 - 18°C, and the overall design is relatively conventional. With the gradual improvement of people's living standards, such temperature-range refrigerators can no longer well meet everyone's needs. There is a need to design high-end refrigerators with a wider temperature range and more complete functions to meet more user needs. For the preservation of food in a vitreous state below -40°C, which is beneficial to maximizing the nutritional value of food, there is a demand for an ultra-low temperature compartment (-40~-60°C) in the high-end user market. To improve user satisfaction and closely grasp the user experience. For this reason, a conventional cascade compression refrigeration system usually consists of two separate refrigeration cycle circuits, which are respectively called the high-temperature stage refrigeration cycle circuit (referred to as the high-temperature part) and the low-temperature stage refrigeration cycle circuit (referred to as the low-temperature part). The high-temperature part uses a first refrigerant with a relatively high evaporation temperature, and the low-temperature part uses a second refrigerant with a relatively low evaporation temperature. And a condensing evaporator is adopted, which uses the cold quantity produced by the first refrigerant in the high-temperature part to condense the second refrigerant vapor discharged from the compressor in the low-temperature part, thereby achieving a low temperature below -60. However, in some of the existing cascade compression refrigeration systems, the high-temperature stage refrigeration cycle circuit is only used to supply cold to the condenser of the low-temperature stage refrigeration cycle circuit, resulting in low refrigeration efficiency of the cascade compression refrigeration system. Moreover, conventional deep-freeze refrigerators only have a single temperature function, which also makes the system efficiency low. Summary of the Invention

[0003] An object of the present invention is to provide a refrigerator that at least partially solves the above problems.

[0004] A further object of the present invention is to improve the refrigeration efficiency of the cascade compression refrigeration system in the refrigerator so that it can supply cold to multiple storage compartments.

[0005] A further object of the present invention is to enable the same storage compartment in the refrigerator to obtain different refrigeration effects.

[0006] The present invention provides a refrigerator, including a box body, inside which a first storage compartment and a second storage compartment are formed. Among them, it also includes a high-temperature stage refrigeration cycle circuit and a low-temperature stage refrigeration cycle circuit;

[0007] The high-temperature stage refrigeration cycle circuit includes a control valve, and a first evaporator, a second evaporator, and an evaporation part for absorbing heat. The first evaporator is used to supply cold to the first storage compartment, and the second evaporator is used to supply cold to the second storage compartment;

[0008] The control valve has a first outlet and a second outlet. The inlet of the first evaporator is in communication with the first outlet; the inlet of the second evaporator is in communication with the second outlet; and

[0009] the outlet of the second evaporator is in communication with the inlet of the first evaporator, and the inlet of the evaporation section is in communication with the outlet of the first evaporator; or, the outlet of the second evaporator is in communication with the inlet of the evaporation section, and the outlet of the evaporation section is in communication with the inlet of the first evaporator;

[0010] The low-temperature stage refrigeration cycle loop includes a condensation section and a third evaporator for absorbing heat. The condensation section is thermally connected to the evaporation section, and the third evaporator is used for cooling the second storage compartment.

[0011] Optionally, the control valve has a third outlet, and the third outlet is in communication with the inlet of the evaporation section.

[0012] Optionally, a third storage compartment is formed inside the box body. The high-temperature stage refrigeration cycle loop further includes a fourth evaporator. The fourth evaporator is disposed between the third outlet and the evaporation section, and the fourth evaporator is used for cooling the third storage compartment.

[0013] Optionally, a first throttling device is disposed between the inlet of the first evaporator and the first outlet;

[0014] a second throttling device is disposed between the inlet of the second evaporator and the second outlet;

[0015] a third throttling device is disposed between the inlet of the fourth evaporator and the third outlet;

[0016] The first storage compartment and the second storage compartment are arranged in parallel along the lateral extension direction of the refrigerator, and the third storage compartment is disposed above the first storage compartment and the second storage compartment.

[0017] Optionally, a valve that only allows the refrigerant from the second evaporator to flow out unidirectionally is disposed on the outlet pipe of the second evaporator.

[0018] Optionally, the refrigerator further includes a air supply device for promoting the air flow to flow through the second evaporator and / or the third evaporator and for promoting the air flow to enter the second storage compartment.

[0019] Optionally, the second evaporator includes a first cooling evaporation pipe, the third evaporator includes a second cooling evaporation pipe, and the first cooling evaporation pipe and the second cooling evaporation pipe are disposed through the same fin group.

[0020] Optionally, the second evaporator is disposed above the third evaporator, and a first refrigerating chamber for arranging the second evaporator and the third evaporator is further formed at a corresponding position on the rear side of the second storage compartment of the cabinet. The first refrigerating chamber is communicated with the second storage compartment through a first air supply structure to supply a refrigerating air flow to the second storage compartment through the first air supply structure.

[0021] Optionally, the first air supply structure is disposed between the first refrigerating chamber and the second storage compartment; an air inlet is provided on the rear side surface of the first air supply structure, a plurality of air outlets are provided on the front side surface of the first air supply structure, and an air supply air duct is provided inside the first air supply structure.

[0022] Optionally, a second refrigerating chamber for arranging the first evaporator is further formed at a corresponding position on the rear side of the first storage compartment of the cabinet. The second refrigerating chamber is communicated with the first storage compartment through a second air supply structure to supply a refrigerating air flow to the first storage compartment through the second air supply structure; the evaporation part and the condensation part are disposed in the second refrigerating chamber.

[0023] In the refrigerator of the present invention, a first evaporator and a second evaporator are provided in the high-temperature stage refrigeration cycle loop. The first evaporator and the second evaporator are respectively used to supply cold to the first storage compartment and the second storage compartment. A third evaporator is provided in the low-temperature stage refrigeration cycle loop for supplying cold to the second storage compartment. The energy utilization efficiency in the high-temperature stage refrigeration cycle loop is improved, and cold can be supplied to multiple storage compartments of the refrigerator simultaneously, improving the refrigeration efficiency of the refrigerator. Both the second evaporator and the third evaporator can supply cold to the second storage compartment, enabling the single storage compartment of the refrigerator to have a multi-temperature zone function, that is, the second storage compartment can obtain different refrigeration effects to meet different refrigeration requirements and storage requirements, and the temperature zone range of the second storage compartment can be expanded. That is to say, the refrigerator can have both a deep cooling function and meet the energy-saving requirements of daily refrigeration.

[0024] Furthermore, the cold supply to the second storage compartment is carried out in an air-cooled manner, which can prevent frosting inside the second storage compartment, ensure the heat exchange efficiency, and cause no inconvenience to the user, that is, air-cooled and frost-free, without the hidden danger of frosting, improving the product use effect and user experience.

[0025] Further, the second evaporator and the third evaporator are of an integral structure and can share fins. For example, they are a two-inlet and two-outlet double-flow channel evaporator, and the structure is an up-and-down structure. When the refrigerator is set to normal operation, the high-temperature stage refrigeration cycle circuit operates, and the upper second evaporator refrigerates. At this time, the evaporators share the fins of the lower evaporator, with a large heat exchange area and high heat exchange efficiency. When the refrigerator is set to deep cooling operation, the lower third evaporator is connected, and the deep cooling system works, cooling the lower evaporator. At the same time, it shares the fins of the upper evaporator, with a large heat exchange area and high heat exchange efficiency. The up-and-down arranged evaporator structure can also make the heat exchange uniform. It can ensure the utilization rate of the heat exchange area of the evaporator, reduce the size of the double-flow channel evaporator, and at the same time make the heat exchange uniform, ensure the uniform distribution of pipelines, and cooperate with the air duct system and the refrigeration fan to achieve both the functions of normal temperature refrigeration and deep cooling refrigeration, and ensure the energy-saving purpose during conventional refrigeration.

[0026] Further, the layout positions of each evaporator and evaporation part in the high-temperature stage refrigeration cycle circuit can ensure the refrigeration efficiency of each evaporator during normal temperature refrigeration, improve the energy efficiency of the refrigerator, and have obvious energy-saving effects.

[0027] From the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more clear about the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Some specific embodiments of the present invention will be described in detail hereinafter with reference to the accompanying drawings in an exemplary but not restrictive manner. The same reference numerals in the drawings denote the same or similar components or parts. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0029] Figure 1 is a schematic diagram of a refrigerator according to an embodiment of the present invention;

[0030] Figure 2 is a schematic diagram of a cascade compression refrigeration system in a refrigerator according to an embodiment of the present invention;

[0031] Figure 3 is a schematic diagram of a cascade compression refrigeration system in a refrigerator according to an embodiment of the present invention;

[0032] Figure 4 is a schematic diagram of a partial structure of a refrigerator according to an embodiment of the present invention;

[0033] Figure 5 is a schematic diagram of a partial structure cross-section of a refrigerator according to an embodiment of the present invention;

[0034] Figure 6 is a schematic diagram of a partial structure of a refrigerator according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] Figure 1 is a schematic diagram of a refrigerator according to an embodiment of the present invention. As Figure 1 shown, and with reference to Figures 2 to 6 , an embodiment of the present invention provides a refrigerator, which may include a cabinet 20 and a refrigeration system. Among them, a plurality of storage compartments are further formed in the cabinet 20, and the storage compartments may include a first storage compartment 21, a second storage compartment 22, and a third storage compartment 23. In the refrigerator of this embodiment, two or three storage compartments may be formed in the cabinet 20. The refrigeration system may be disposed in the cabinet 20, and the refrigeration system includes a high-temperature refrigeration cycle circuit 30 and a low-temperature refrigeration cycle circuit 40, and this refrigeration system may also be referred to as a cascade compression refrigeration system.

[0036] The high-temperature refrigeration cycle circuit 30 is used for circulating a first refrigerant, and a control valve 33 is disposed therein, as well as a first evaporator 35, a second evaporator 36, and an evaporation section 37 for absorbing heat. The first evaporator 35 and the second evaporator 36 are used to cause the first refrigerant flowing through them to absorb heat, and are respectively used to supply cold to the first storage compartment 21 and the second storage compartment 22. The high-temperature refrigeration cycle circuit 30 further includes a high-temperature compressor 31 and a high-temperature condensing device 32. The low-temperature refrigeration cycle circuit 40 is used for circulating a second refrigerant, and a condensing section 42 and a third evaporator 44 are disposed therein. Among them, the third evaporator 44 is used to cause the second refrigerant flowing through it to absorb heat, and is used to supply cold to the second storage compartment 22. The low-temperature refrigeration cycle circuit 40 further includes a low-temperature compressor 41. That is, the high-temperature refrigeration cycle circuit 30 may include: a high-temperature compressor 31, a high-temperature condensing device 32, a control valve 33, an evaporation section 37, a first evaporator 35, and a second evaporator 36. The low-temperature refrigeration cycle circuit 40 may include: a low-temperature compressor 41, a condensing section 42, and a third evaporator 44. The evaporation section 37 is used to cause the first refrigerant flowing through it to absorb the heat of the second refrigerant flowing through the condensing section 42 in the low-temperature refrigeration cycle circuit 40. The first refrigerant and the second refrigerant may be the same refrigerant, such as R600a, or different refrigerants.

[0037] The refrigerant, also known as the refrigerant medium, usually completes energy conversion through phase change, and is a working substance that circulates in the refrigeration system of a refrigeration device. Its working principle is: the refrigerant absorbs the heat of the substance to be cooled in the evaporator and evaporates, and transfers the absorbed heat to the surrounding air or water in the condenser and is cooled into a liquid, and circulates reciprocally, achieving the refrigeration effect by means of state changes. The "high temperature" and "low temperature" in the "high-temperature refrigeration cycle circuit 30" and the "low-temperature refrigeration cycle circuit 40" are relative. Relatively speaking, the evaporation temperature of the first refrigerant flowing through the high-temperature refrigeration cycle circuit 30 is higher than the evaporation temperature of the second refrigerant flowing through the low-temperature refrigeration cycle circuit 40.

[0038] In the refrigerator according to the embodiment of the present invention, a first evaporator 35 and a second evaporator 36 are provided in the high-temperature stage refrigeration cycle circuit 30. The first evaporator 35 and the second evaporator 36 are respectively used to supply cold to the first storage compartment 21 and the second storage compartment 22. A third evaporator 44 is provided in the low-temperature stage refrigeration cycle circuit 40 and is used to supply cold to the second storage compartment 22. The energy utilization efficiency in the high-temperature stage refrigeration cycle circuit 30 is improved, and cold can be supplied to multiple storage compartments of the refrigerator simultaneously, improving the refrigeration efficiency of the refrigerator. Both the second evaporator 36 and the third evaporator 44 can supply cold to the second storage compartment 22, enabling a single storage compartment of the refrigerator to have a multi-temperature zone function, that is, the second storage compartment 22 can obtain different refrigeration effects to meet different refrigeration requirements, and the temperature zone range of the second storage compartment 22 can be expanded. That is to say, the refrigerator can have both a deep cooling function and meet the energy-saving requirements of daily refrigeration.

[0039] Preferably, in the embodiment of the present invention, the inlet of the control valve 33 can be communicated with the inlet of the high-temperature stage condensing device 32. The control valve 33 has a first outlet and a second outlet. The inlet of the first evaporator 35 is communicated with the first outlet; the inlet of the second evaporator 36 is communicated with the second outlet. The outlet of the second evaporator 36 is communicated with the inlet of the first evaporator 35, and the inlet of the evaporation part 37 is communicated with the outlet of the first evaporator 35. In some other embodiments, the outlet of the second evaporator 36 is communicated with the inlet of the evaporation part 37, and the outlet of the evaporation part 37 is communicated with the inlet of the first evaporator 35. The control valve 33 can be a switching valve. The layout positions of the evaporators and the evaporation part 37 in the high-temperature stage refrigeration cycle circuit 30 can ensure the refrigeration efficiency of each evaporator during normal temperature refrigeration, improve the energy efficiency of the refrigerator, and the energy-saving effect is obvious.

[0040] In some embodiments of the present invention, the control valve 33 has a third outlet, and the third outlet is communicated with the inlet of the evaporation part 37. It can make the evaporation part 37 work alone or make the evaporation part 37 and the first evaporator 35 work while the second evaporator 36 does not work, improving the deep cooling efficiency. Further, the high-temperature stage refrigeration cycle circuit 30 further includes a fourth evaporator 38. The fourth evaporator 38 is disposed between the third outlet and the evaporation part 37, and the fourth evaporator 38 is used for the third storage compartment 23. When the evaporation part 37 works, the third storage compartment 23 can also be refrigerated simultaneously, improving the working efficiency of the high-temperature stage refrigeration cycle circuit 30, and the energy-saving effect is obvious.

[0041] A first throttling device 341 is provided between the inlet and the first outlet of the first evaporator 35; a second throttling device 342 is provided between the inlet and the second outlet of the second evaporator 36; a third throttling device 343 is provided between the inlet and the third outlet of the fourth evaporator 38. In some alternative embodiments, a total throttling device may be provided at the inlet of the control valve 33. Further, the first throttling device, the second throttling device, and the third throttling device may all be capillary tubes. Optionally, the first throttling device, the second throttling device, and the third throttling device may all be electromagnetic expansion valves. Then the control valve 33 may be selected as a multi-outlet diverter valve at this time.

[0042] In some embodiments of the present invention, the first storage compartment 21 and the second storage compartment 22 are arranged in parallel along the lateral extension direction of the refrigerator, and the third storage compartment 23 is arranged above the first storage compartment 21 and the second storage compartment 22. The first storage compartment 21 may be a freezer compartment, the second storage compartment 22 is a multi-temperature multi-functional compartment, and the third storage compartment 23 may be a refrigerating compartment. Such an arrangement can make the compartment layout more reasonable and make it more convenient to access the corresponding items.

[0043] In some embodiments of the present invention, such as Figure 2 , Figure 4 , Figure 5 shown, the refrigerator further includes a blowing device 50 for promoting the air flow to flow through the second evaporator 36 and / or the third evaporator 44, and for promoting the air flow to enter the second storage compartment 22. In some preferred embodiments, the second evaporator 36 includes a first cooling evaporation tube, the third evaporator 44 includes a second cooling evaporation tube, and the first cooling evaporation tube and the second cooling evaporation tube are arranged through the same fin group. The second evaporator 36 may form a double-tube evaporator together with the third evaporator 44 and the fin group through which they are arranged. That is to say, the double-tube evaporator has two sets of evaporation tubes, namely the second evaporator 36 and the third evaporator 44. The second evaporator 36 is arranged above the third evaporator 44.

[0044] Further, a first refrigeration chamber 24 for arranging the second evaporator 36 and the third evaporator 44 is further formed at the corresponding position on the rear side of the second storage compartment 22 of the box body 20, and the first refrigeration chamber 24 is communicated with the second storage compartment 22 through a first air blowing structure to provide a refrigerating air flow to the second storage compartment 22 through the first air blowing structure.

[0045] Such as Figure 2 , Figure 4 and Figure 5As shown, the second evaporator 36 and the third evaporator 44 are of an integral structure and can share fins. For example, they are two-inlet two-outlet double-flow channel evaporators with an up-and-down structure. When the refrigerator is set to normal operation, the high-temperature stage refrigeration cycle circuit 30 operates, and the upper second evaporator 36 cools. At this time, the evaporators share the fins of the lower evaporator, with a large heat exchange area and high heat exchange efficiency. When the refrigerator is set to deep cooling operation, the lower third evaporator 44 is connected, and the deep cooling system works to cool the lower evaporator. At the same time, the fins of the upper evaporator are shared, with a large heat exchange area and high heat exchange efficiency. The up-and-down arrangement of the evaporator structure can also make the heat exchange uniform. It can ensure the utilization rate of the evaporator heat exchange area, reduce the size of the double-flow channel evaporator, and at the same time, the heat exchange is uniform, ensuring the uniform distribution of the pipeline. Cooperating with the air duct system and the refrigeration fan, it can not only realize the two functions of normal temperature refrigeration and deep cooling refrigeration but also ensure the energy-saving purpose during conventional refrigeration.

[0046] In some embodiments of the present invention, as Figure 1 and Figure 6 shown, a second refrigeration chamber for arranging the first evaporator 35 is further formed at the corresponding position on the rear side of the first storage compartment 21 of the cabinet 20. The second refrigeration chamber is communicated with the first storage compartment 21 through the second air supply structure 52 to supply cold air flow to the first storage compartment 21 through the second air supply structure 52. A third refrigeration chamber for arranging the fourth evaporator 38 is further formed at the corresponding position on the rear side of the third storage compartment 23 of the cabinet 20. The third refrigeration chamber is communicated with the third storage compartment 23 through the third air supply structure to supply cold air flow to the third storage compartment 23 through the third air supply structure.

[0047] The first air supply structure is arranged between the first refrigeration chamber 24 and the second storage compartment 22; an air inlet is arranged on the rear side surface of the first air supply structure, and the air supply device 50 is arranged at the air inlet. A plurality of air supply outlets 54 are arranged on the front side surface of the first air supply structure, and an air supply air duct 55 is arranged in the first air supply structure 51. A return air duct 56 can be arranged on the lower side of the first air supply structure to realize the evaporator to supply air from the bottom and discharge air from the upper part. The second air supply structure and the third air supply structure are both similar to the first air supply structure 51.

[0048] As Figure 2 and Figure 3As shown, a valve that only allows the refrigerant from the second evaporator 36 to flow out unidirectionally is provided on the outlet pipe of the second evaporator 36. This valve can be a check valve 39, and the check valve 39 can prevent the refrigerant downstream of the check valve 39 from flowing backward. When the low-stage compressor 41 operates, the temperature of the third evaporator 44 is very low. Due to the short distance between the second evaporator 36 and the third evaporator 44, the pipeline temperature of the second evaporator 36 is also relatively low, and even significantly lower than the temperatures of other evaporators downstream of the second evaporator 36 in the high-stage refrigeration cycle circuit 30. This valve can prevent the first refrigerant in other cooling evaporators downstream of the second evaporator 36 from flowing into the second evaporator 36 from the discharge outlet of the second evaporator 36, thereby avoiding the reverse flow of the first refrigerant in the high-stage refrigeration cycle circuit 30, ensuring the effective flow rate of the first refrigerant, and improving the overall refrigeration efficiency.

[0049] Taking R600a as an example, when the refrigerant temperature is -50°C, the pressure is about 0.017 Mpa, and the suction pressure of the compressor for R600a is about 0.06 Mpa. The pressure on the second evaporator 36 side is lower than the suction pressure of the high-stage compressor 31, resulting in the gradual accumulation of the high-stage refrigeration cycle circuit in the second evaporator 36, a gradual reduction in the refrigerant in the high-stage refrigeration cycle circuit, and poor refrigeration. The check valve 39 can prevent the refrigerant from flowing backward and accumulating in the second evaporator 36, causing poor refrigeration. By using the check valve 39, the problem of refrigerant accumulation caused by low temperature can be solved without using a control program to adjust the operation of the valve body. The structure is simple and the operability is strong.

[0050] The high-stage condensing device 32 can include a condenser and an anti-dew tube. The low-stage refrigeration cycle circuit 40 further includes a low-stage condensing device 45 and a low-stage throttling device 43. The inlet of the high-stage condensing device 32 is connected to the outlet of the high-stage compressor 31, the outlet of the evaporation part 37 is connected to the inlet of the first evaporator 35, and the outlet of the first evaporator 35 is connected to the inlet of the high-stage compressor 31. The outlet of the low-stage compressor 41 is connected to the inlet of the low-stage condensing device 45, the outlet of the low-stage condensing device 45 is connected to the inlet of the condensing part 42, the outlet of the condensing part 42 is connected to the low-stage throttling device 43, and the outlet of the low-stage throttling device 43 is connected to the inlet of the third evaporator 44. The outlet of the third evaporator 44 is connected to the inlet of the low-stage compressor 41.

[0051] In some alternative embodiments, the condensation part 42 and the evaporation part 37 may form a condensing evaporator. The condensing evaporator may be a double-pipe heat exchanger, which is formed by sleeving and connecting two standard pipes of different sizes to form concentric double pipes. The outer channel is called the shell side, and the inner channel is called the tube side. Two different media can flow in opposite (or the same) directions in the shell side and the tube side to achieve the heat exchange effect. The evaporation part 37 may be the tube side, and the condensation part 42 may be the shell side. In some other alternative embodiments, the condensation part 42 and the evaporation part 37 may also be two copper pipes that are in contact with each other. The two copper pipes are arranged in contact with each other. At the contact part between the two copper pipes, soldering can be used for fixation to enhance heat transfer. The outsides of the two copper pipes can be wrapped with aluminum foil. In some other alternative embodiments, the condensation part 42 and the evaporation part 37 may share heat exchange fins. The evaporation part 37 and the condensation part 42 are arranged in the second refrigeration chamber. Of course, the evaporation part 37 and the condensation part 42 may also be arranged at other positions of the refrigerator.

[0052] At this point, those skilled in the art should recognize that although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived from the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and determined to cover all these other variations or modifications.

Claims

1. A refrigerator, comprising a box body, wherein a first storage compartment and a second storage compartment are formed inside the box body, and it is characterized in that, It further includes a high-temperature stage refrigeration cycle circuit and a low-temperature stage refrigeration cycle circuit; The high-temperature stage refrigeration cycle circuit includes a control valve, and a first evaporator, a second evaporator and an evaporation part for absorbing heat. The first evaporator is used to supply cooling to the first storage compartment, and the second evaporator is used to supply cooling to the second storage compartment; The control valve has a first outlet and a second outlet. The inlet of the first evaporator is communicated with the first outlet; the inlet of the second evaporator is communicated with the second outlet; and The outlet of the second evaporator is communicated with the inlet of the first evaporator, and the inlet of the evaporation part is communicated with the outlet of the first evaporator; or, the outlet of the second evaporator is communicated with the inlet of the evaporation part, and the outlet of the evaporation part is communicated with the inlet of the first evaporator; The low-temperature stage refrigeration cycle circuit includes a condensation part and a third evaporator for absorbing heat. The condensation part is thermally connected to the evaporation part, and the third evaporator is used to supply cooling to the second storage compartment; At a position corresponding to the rear side of the first storage compartment of the box body, a second refrigeration chamber for arranging the first evaporator is further formed. The second refrigeration chamber is communicated with the first storage compartment through a second air supply structure, so as to supply a cooling air flow to the first storage compartment through the second air supply structure; The evaporation part and the condensation part are arranged in the second refrigeration chamber; The control valve has a third outlet, and the third outlet is communicated with the inlet of the evaporation part.

2. The refrigerator according to claim 1, wherein A third storage compartment is formed inside the box body. The high-temperature stage refrigeration cycle circuit further includes a fourth evaporator. The fourth evaporator is arranged between the third outlet and the evaporation part, and the fourth evaporator is used to supply cooling to the third storage compartment.

3. The refrigerator according to claim 2, wherein A first throttling device is arranged between the inlet of the first evaporator and the first outlet; A second throttling device is arranged between the inlet of the second evaporator and the second outlet; A third throttling device is arranged between the inlet of the fourth evaporator and the third outlet; The first storage compartment and the second storage compartment are arranged in parallel along the transverse extension direction of the refrigerator, and the third storage compartment is arranged above the first storage compartment and the second storage compartment.

4. The refrigerator according to claim 1, wherein A valve that only allows the refrigerant from the second evaporator to flow out unidirectionally is arranged on the outlet pipe of the second evaporator.

5. The refrigerator according to claim 1, wherein It further includes: An air supply device for promoting the air flow to flow through the second evaporator and / or the third evaporator, and promoting the air flow to enter the second storage compartment.

6. The refrigerator according to claim 1, wherein The second evaporator includes a first cooling evaporation pipe, and the third evaporator includes a second cooling evaporation pipe. The first cooling evaporation pipe and the second cooling evaporation pipe are arranged through the same fin group.

7. The refrigerator according to claim 6, wherein The second evaporator is disposed above the third evaporator, and a first refrigerating chamber for arranging the second evaporator and the third evaporator is further formed at a corresponding position on the rear side of the second storage compartment of the box body. The first refrigerating chamber is communicated with the second storage compartment through a first air supply structure to supply a refrigerating air flow to the second storage compartment through the first air supply structure.

8. The refrigerator according to claim 7, wherein the first air supply structure is disposed between the first refrigerating chamber and the second storage compartment; an air inlet is disposed on the rear side surface of the first air supply structure, a plurality of air outlets are disposed on the front side surface of the first air supply structure, and an air supply air duct is disposed inside the first air supply structure.

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