Refrigeration system and holding cabinet having the same

Abstract

The utility model provides a kind of refrigeration system and the preservation box with it, wherein the refrigeration circuit of refrigeration system includes the compressor and gas-liquid separator of intercommunication;First freezing branch includes the first throttling member and first evaporator of series connection;Second freezing branch includes second throttling member;Freezing main road includes second evaporator, the other end of first freezing branch and the other end of second freezing branch are connected with the one end of freezing main road, the other end of freezing main road is connected with the inlet of compressor;Wherein, when refrigeration system is in freezing state, first freezing branch is communicated with gaseous outlet, second freezing branch is disconnected with gaseous outlet, or, second freezing branch is communicated with gaseous outlet, first freezing branch is communicated with gaseous outlet;When refrigeration system is in extreme freezing state, second freezing branch and first freezing branch are communicated with gaseous outlet.The utility model effectively solves the problem of poor storage versatility of existing preservation box in prior art.

Description

Technical Field

[0001] This utility model relates to the field of compressor technology, and more specifically, to a refrigeration system and a storage box having the same. Background Technology

[0002] Currently, in the medical, biological, and scientific research fields, the long-term preservation of various products such as pharmaceuticals, vaccines, blood, and cells requires different low-temperature environments. For example, medical drugs often require a refrigerated environment of 2°C to 8°C, microorganisms and freeze-dried vaccines require a freezing environment of -40°C to -60°C, while blood, tissues, and cells require an extreme freezing environment of -60°C to -80°C for preservation.

[0003] However, existing cryogenic storage boxes typically only provide a single target temperature. When users have storage needs in multiple temperature zones, they have to configure multiple storage boxes with different temperature zones. Multiple independent storage boxes occupy a lot of space, increasing site costs. Existing storage boxes cannot flexibly store items in different temperature zones, reducing the storage versatility and flexibility of the storage boxes. Utility Model Content

[0004] The main objective of this invention is to provide a refrigeration system and a storage box having the same, in order to solve the problem of poor versatility of storage boxes in the prior art.

[0005] To achieve the above objectives, this utility model provides a refrigeration system, comprising: a refrigeration circuit including a compressor and a gas-liquid separator connected in series; a first refrigeration branch including a first throttling element and a first evaporator arranged in series, one end of the first refrigeration branch selectively connected to or disconnected from the gaseous outlet of the gas-liquid separator; a second refrigeration branch including a second throttling element, one end of the second refrigeration branch selectively connected to or disconnected from the gaseous outlet; and a main refrigeration circuit including a second evaporator, the other ends of the first and second refrigeration branches being connected to one end of the main refrigeration circuit, the other end of the main refrigeration circuit being connected to the inlet of the compressor; wherein, the refrigeration system has a freezing state and an extreme freezing state; when the refrigeration system is in the freezing state, the first refrigeration branch is connected to the gaseous outlet and the second refrigeration branch is disconnected from the gaseous outlet, or the second refrigeration branch is connected to the gaseous outlet and the first refrigeration branch is disconnected from the gaseous outlet; when the refrigeration system is in the extreme freezing state, both the second and first refrigeration branches are connected to the gaseous outlet.

[0006] Furthermore, the refrigeration system also includes: a switching valve having an inlet, a first switching port, and a second switching port, the inlet being selectively connected to at least one of the first and second switching ports, the inlet being connected to a gaseous outlet, the first switching port being connected to or disconnected from a first refrigeration branch, and the second switching port being used to connect to or disconnect from a second refrigeration branch; and / or, a first flow control valve disposed on the first refrigeration branch for controlling the flow rate of the mixed refrigerant within the first refrigeration branch.

[0007] Furthermore, the refrigeration system also includes: a refrigeration branch, comprising a refrigeration throttling device and a refrigeration evaporator arranged in series, one end of the refrigeration branch being connected to the liquid outlet of the gas-liquid separator, and the other end of the refrigeration branch being connected to the main refrigeration line; and a second flow control valve, which is installed on the refrigeration branch to control the flow rate of the mixed refrigerant in the refrigeration branch.

[0008] Furthermore, the refrigeration system also includes a regenerative structure, which includes: a first regenerative section, one end of which is connected to a gas outlet, and the other end of which is optionally connected to at least one of a first refrigeration branch and a second refrigeration branch; and a second regenerative section, both ends of which are connected to the main refrigeration circuit and the compressor inlet, respectively; wherein the second regenerative section is used for heat exchange with the first regenerative section.

[0009] Furthermore, the refrigeration system also includes a heat exchange structure; the heat exchange structure includes: a first heat exchange section, one end of which is connected to a first regenerating section, and the other end of which is optionally connected to at least one of a first refrigeration branch and a second refrigeration branch; and a second heat exchange section, which is disposed on the main refrigeration branch; wherein the second heat exchange section is used to exchange heat with the first heat exchange section.

[0010] Furthermore, the refrigeration circuit also includes a condenser, one end of which is connected to the outlet of the compressor, and the other end of which is connected to the inlet of the gas-liquid separator; wherein, the refrigeration circuit also includes: a filter structure, disposed in the connecting flow path between the inlet of the condenser and the inlet of the gas-liquid separator, for filtering the condensed mixed refrigerant; and / or, an anti-condensation structure, one end of which is connected to the condenser, and the other end of which is connected to the inlet of the gas-liquid separator; and / or, a heat dissipation structure, disposed on one side of the condenser, for dissipating heat from the condenser.

[0011] This application also provides a storage box, including: a box body having a storage space, the storage space including a refrigeration zone, a first freezing zone and a second freezing zone; the aforementioned refrigeration system is disposed in the storage space, the refrigeration evaporator of the refrigeration system is located in the refrigeration zone, the first evaporator of the refrigeration system is located in the first freezing zone, and the second evaporator of the refrigeration system is located in the second freezing zone.

[0012] Furthermore, the storage box also includes: a temperature detection device, which is installed on the box body, the temperature detection device including a first temperature detection element and a second temperature detection element, the first temperature detection element and the second temperature detection element being used to detect the temperature at the first evaporator and the temperature at the second evaporator respectively; and a control structure, which is connected to both the first temperature detection element and the second temperature detection element and the refrigeration system, so as to control the refrigeration system according to the detection results of the first temperature detection element and the second temperature detection element.

[0013] Furthermore, the storage box also includes: a door, movably disposed on the box body; wherein at least a portion of the anti-condensation structure of the refrigeration system is disposed around the periphery of the door.

[0014] Furthermore, the storage box also includes a pressure detection device, comprising a first pressure detection element and a second pressure detection element. The first pressure detection element is located at the outlet of the compressor, and the second pressure detection element is located at the inlet of the compressor, for detecting the gas pressure at the compressor outlet and inlet.

[0015] The refrigeration circuit of the refrigeration system using the technical solution of this utility model includes a compressor and a gas-liquid separator connected in series. A first refrigeration branch includes a first throttling element and a first evaporator arranged in series, and one end of the first refrigeration branch is selectively connected to or disconnected from the gaseous outlet of the gas-liquid separator. A second refrigeration branch includes a second throttling element, and one end of the second refrigeration branch is selectively connected to or disconnected from the gaseous outlet. A main refrigeration circuit includes a second evaporator, and the other ends of both the first and second refrigeration branches are connected to one end of the main refrigeration circuit, which is connected to the compressor inlet. The refrigeration system has a freezing state and an extreme freezing state. When the refrigeration system is in the freezing state, the first refrigeration branch is connected to the gaseous outlet, and the second refrigeration branch is disconnected from the gaseous outlet, or vice versa. When the refrigeration system is in the extreme freezing state, both the second and first refrigeration branches are connected to the gaseous outlet. In this way, when users need to store different types of items, the refrigeration system inside the storage box compresses the mixed refrigerant into a high-temperature, high-pressure gas through the compressor in the refrigeration circuit. This gas is then condensed into a two-phase (gas and liquid) mixed refrigerant in the refrigeration circuit. Afterward, the gas-liquid separator separates the two-phase mixed refrigerant into gaseous and liquid refrigerant. If the user chooses to keep the refrigeration system in freezing mode, the first refrigeration branch connects to the gaseous outlet of the gas-liquid separator. This allows the gaseous refrigerant to pass through the first throttling device for pressure reduction and throttling, and then be evaporated and absorb heat by the first evaporator. The gaseous refrigerant flowing out of the first evaporator continues to flow to the second evaporator in the main refrigeration circuit, where it is evaporated and absorbs heat, thus lowering the temperature at both the first and second evaporators and achieving frozen storage in the storage box. Alternatively, the second refrigeration branch is connected to the gaseous outlet of the gas-liquid separator, allowing the gaseous refrigerant to pass through the second throttling device for pressure reduction and throttling, and then be evaporated and absorb heat by the second evaporator, thus lowering the temperature at the second evaporator and achieving frozen storage in the storage box. The first or second refrigeration branch is connected to the gaseous outlet of the gas-liquid separator, ensuring that the storage box meets the requirements of a freezing environment of -40℃ to -60℃, guaranteeing the storage of items such as microorganisms and freeze-dried vaccines. At this point, if the user chooses to put the refrigeration system in extreme freezing mode, both the first and second refrigeration branches are connected to the gaseous outlet of the gas-liquid separator. This allows the gaseous refrigerant in both branches to flow into the second evaporator, further reducing the temperature at the second evaporator. This ensures that the second evaporator meets the requirements of an extreme freezing environment of -60℃ to -80℃, guaranteeing the storage of items such as blood, tissues, and cells. Simultaneously, it also ensures that the temperature at the first evaporator meets the requirements of a freezing environment of -40℃ to -60℃. Thus, the storage box can simultaneously meet the requirements of both freezing and extreme freezing environments, enabling it to store different types of items at the same time. This improves the storage versatility of the storage box and solves the problem of poor storage versatility in existing technologies. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0017] Figure 1 A schematic diagram of an embodiment of the refrigeration system according to the present invention is shown.

[0018] The above figures include the following reference numerals:

[0019] 10. Refrigeration circuit; 11. Compressor; 12. Gas-liquid separator; 13. Condenser; 14. Filter structure; 15. Anti-condensation structure; 16. Heat dissipation structure;

[0020] 20. First refrigeration branch; 21. First throttling element; 22. First evaporator;

[0021] 30. Second refrigeration branch; 31. Second throttling element;

[0022] 40. Refrigeration main circuit; 41. Second evaporator;

[0023] 50. Switching valve;

[0024] 60. First flow control valve;

[0025] 70. Refrigeration branch circuit; 71. Refrigeration throttling device; 72. Refrigeration evaporator;

[0026] 80. Second flow control valve;

[0027] 90. Regenerative structure; 91. First regenerative section; 92. Second regenerative section;

[0028] 100. Heat exchange structure; 110. First heat exchange section; 120. Second heat exchange section. Detailed Implementation

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0031] In this utility model, unless otherwise stated, directional terms such as "upper" and "lower" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" are generally used in relation to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0032] To address the problem of poor versatility in storage boxes in the prior art, this application provides a refrigeration system and a storage box having the same.

[0033] like Figure 1 As shown, the refrigeration system includes a refrigeration circuit 10, a first refrigeration branch 20, a second refrigeration branch 30, and a main refrigeration circuit 40. The refrigeration circuit 10 includes a compressor 11 and a gas-liquid separator 12 connected in series. The first refrigeration branch 20 includes a first throttling element 21 and a first evaporator 22 arranged in series. One end of the first refrigeration branch 20 can be selectively connected to or disconnected from the gaseous outlet of the gas-liquid separator 12. The second refrigeration branch 30 includes a second throttling element 31. One end of the second refrigeration branch 30 can be selectively connected to or disconnected from the gaseous outlet. The main refrigeration circuit 40 includes a second evaporator 41. The other ends of the first refrigeration branch 20 and the second refrigeration branch 30 are both connected to one end of the main refrigeration circuit 40, and the other end of the main refrigeration circuit 40 is connected to the inlet of the compressor 11. The refrigeration system has both a freezing state and an extreme freezing state. When the refrigeration system is in freezing mode, the first refrigeration branch 20 is connected to the gas outlet, and the second refrigeration branch 30 is disconnected from the gas outlet; alternatively, the second refrigeration branch 30 is connected to the gas outlet, and the first refrigeration branch 20 is disconnected from the gas outlet. When the refrigeration system is in extreme freezing mode, both the second refrigeration branch 30 and the first refrigeration branch 20 are connected to the gas outlet.

[0034] Applying the technical solution of this embodiment, the refrigeration circuit 10 of the refrigeration system includes a compressor 11 and a gas-liquid separator 12 connected to each other. The first refrigeration branch 20 includes a first throttling element 21 and a first evaporator 22 arranged in series. One end of the first refrigeration branch 20 can be selectively connected to or disconnected from the gaseous outlet of the gas-liquid separator 12. The second refrigeration branch 30 includes a second throttling element 31. One end of the second refrigeration branch 30 can be selectively connected to or disconnected from the gaseous outlet. The main refrigeration circuit 40 includes a second evaporator 41. The other ends of the first refrigeration branch 20 and the second refrigeration branch 30 are both connected to one end of the main refrigeration circuit 40, and the other end of the main refrigeration circuit 40 is connected to the inlet of the compressor 11. The refrigeration system has a freezing state and an extreme freezing state. When the refrigeration system is in the freezing state, the first refrigeration branch 20 is connected to the gaseous outlet, and the second refrigeration branch 30 is disconnected from the gaseous outlet; or, the second refrigeration branch 30 is connected to the gaseous outlet, and the first refrigeration branch 20 is disconnected from the gaseous outlet. When the refrigeration system is in extreme freezing mode, both the second refrigeration branch 30 and the first refrigeration branch 20 are connected to the gas outlet. Thus, when the user needs to store different types of items, the refrigeration system inside the storage box compresses the mixed refrigerant into a high-temperature, high-pressure gas through the compressor 11 of the refrigeration circuit 10. This gas is then condensed into a gas-liquid two-phase mixed refrigerant through the refrigeration circuit 10, and subsequently separated into gaseous and liquid refrigerant by the gas-liquid separator 12. If the user chooses to freeze the refrigeration system, the first refrigeration branch 20 is connected to the gas outlet of the gas-liquid separator 12. This allows the gaseous refrigerant to be throttled and depressurized by the first throttling element 21 and evaporated and absorbed heat by the first evaporator 22. The gaseous refrigerant flowing out of the first evaporator 22 continues to flow to the second evaporator 41 of the main refrigeration circuit 40, where it is evaporated and absorbed heat, lowering the temperature at both the first and second evaporators 22 and achieving frozen storage in the storage box. Alternatively, the second refrigeration branch 30 is connected to the gaseous outlet of the gas-liquid separator 12, so that the gaseous refrigerant is throttled and depressurized by the second throttling element 31 and evaporated and absorbed heat by the second evaporator 41, thereby reducing the temperature at the second evaporator 41 and realizing the frozen storage of the storage box. The connection between the first refrigeration branch 20 or the second refrigeration branch 30 and the gaseous outlet of the gas-liquid separator 12 makes the storage box meet the requirements of the freezing environment of -40℃ to -60℃, ensuring the storage of microorganisms and freeze-dried vaccines.At this time, if the user chooses to put the refrigeration system in extreme freezing mode, both the first refrigeration branch 20 and the second refrigeration branch 30 are connected to the gaseous outlet of the gas-liquid separator 12, so that the gaseous refrigerant in the first refrigeration branch 20 and the second refrigeration branch 30 flows into the second evaporator 41, further reducing the temperature at the second evaporator 41. This allows the second evaporator 41 to meet the requirements of an extreme freezing environment of -60℃ to -80℃, ensuring the storage of items such as blood, tissues, and cells. At the same time, it also ensures that the temperature at the first evaporator 22 meets the requirements of a freezing environment of -40℃ to -60℃. Thus, the storage box can meet the requirements of both freezing and extreme freezing environments, allowing the storage box to store different types of items at the same time. This improves the storage versatility of the storage box and solves the problem of poor storage versatility in the prior art.

[0035] In this embodiment, the mixed refrigerant is a mixture of two non-azeotropic refrigerants, optionally a mixture of R600a and R1150; or a mixture of R14 and R23.

[0036] Specifically, the two non-azeotropic refrigerants have different boiling points, causing the refrigerant mixture to be condensed into gaseous and liquid refrigerants in the refrigeration circuit 10.

[0037] Specifically, the refrigeration system is located inside the storage box.

[0038] like Figure 1 As shown, the refrigeration system also includes a switching valve 50 and a first flow control valve 60. The switching valve 50 has an inlet, a first switching port, and a second switching port. The inlet can be selectively connected to at least one of the first and second switching ports. The inlet is connected to a gaseous outlet. The first switching port is connected to or disconnected from the first refrigeration branch 20, and the second switching port is used to connect to or disconnect from the second refrigeration branch 30. And / or, the first flow control valve 60 is disposed on the first refrigeration branch 20 to control the flow rate of the mixed refrigerant within the first refrigeration branch 20. Thus, by setting the switching valve 50, automated and reliable control of the connection state of the first refrigeration branch 20 and the second refrigeration branch 30 is achieved, as well as the convenience and speed of connecting the first refrigeration branch 20 and the second refrigeration branch 30 to the gaseous outlet of the gas-liquid separator 12, improving the accuracy and reliability of the refrigeration system control. Meanwhile, the addition of a first flow control valve 60 enables fine adjustment of the flow rate of the gaseous refrigerant in the first refrigeration branch 20, achieving further independent control of the first refrigeration branch 20. This, in turn, enables independent and precise control of the cooling capacity of the first evaporator 22, improving the control independence and accuracy of the refrigeration system. It also allows the refrigeration system to adapt to the needs of different operating conditions, ensuring stable operation and temperature control accuracy of the refrigeration system under various operating conditions, and enhancing the versatility of the refrigeration system.

[0039] like Figure 1 As shown, the refrigeration system also includes a refrigeration branch 70. The refrigeration branch 70 includes a refrigeration throttling device 71 and a refrigeration evaporator 72 connected in series. One end of the refrigeration branch 70 is connected to the liquid outlet of the gas-liquid separator 12, and the other end is connected to the main refrigeration circuit 40. A second flow control valve 80 is installed on the refrigeration branch 70 to control the flow rate of the mixed refrigerant within it. Thus, the liquid refrigerant separated by the gas-liquid separator 12 is throttled and depressurized by the refrigeration throttling device 71 in the refrigeration branch 70 and then absorbed heat by the refrigeration evaporator 72, lowering the temperature at the refrigeration evaporator 72. This ensures that the temperature at the refrigeration evaporator 72 meets the requirements of a refrigeration environment of 2℃~8℃, thereby enabling the storage box to meet the requirements of a refrigeration environment of 2℃~8℃. This allows the storage box to simultaneously possess refrigeration, freezing, and extreme freezing storage capabilities, improving its versatility for storing different types of items. Meanwhile, the setting of the second flow control valve 80 enables the refrigeration system to control the flow rate of the liquid refrigerant in the refrigeration branch 70, realizes the independent controllability of the refrigeration branch 70, and also enables the temperature at the refrigeration evaporator 72 to be precisely controlled completely independently of the first evaporator 22 and the second evaporator 41, thereby improving the adaptability of the refrigeration system to multi-temperature zone storage requirements and enhancing the independent and precise controllability of the multi-temperature zone of the refrigeration system.

[0040] In this embodiment, the refrigeration system can achieve dual-temperature and tri-temperature zones in the storage box through the first refrigeration branch 20, the second refrigeration branch 30, and the refrigeration branch 70. When the first refrigeration branch 20 is connected to the gaseous outlet of the gas-liquid separator 12, and the second refrigeration branch 30 is disconnected from the gaseous outlet (or the first refrigeration branch 20 is disconnected from the gaseous outlet, and the second refrigeration branch 30 is connected to the gaseous outlet), and the refrigeration branch 70 is connected to the liquid outlet of the gas-liquid separator 12, the storage box achieves dual-temperature zones of refrigeration and freezing. When both the first refrigeration branch 20 and the second refrigeration branch 30 are connected to the gaseous outlet, and the refrigeration branch 70 is connected to the liquid outlet, the storage box achieves tri-temperature zones of refrigeration, freezing, and extreme freezing, improving the storage diversity and versatility.

[0041] like Figure 1As shown, the refrigeration system also includes a regenerative structure 90, which comprises a first regenerative section 91 and a second regenerative section 92. One end of the first regenerative section 91 is connected to the gas outlet, and the other end of the first regenerative section 91 is optionally connected to at least one of the first refrigeration branch 20 and the second refrigeration branch 30. The two ends of the second regenerative section 92 are connected to the main refrigeration circuit 40 and the inlet of the compressor 11, respectively. The second regenerative section 92 is used for heat exchange with the first regenerative section 91. Thus, the regenerative structure 90 cools the gaseous refrigerant flowing from the gas outlet through the first regenerative section 91, causing the gaseous refrigerant to be pre-cooled before entering the first refrigeration branch 20 or the second refrigeration branch 30. This improves the refrigeration efficiency of the first evaporator 22 and the second evaporator 41, reduces the temperature at the first evaporator 22 and the second evaporator 41, and ensures the reliability of the freezing and extreme freezing environments of the storage box. Meanwhile, the regenerator structure 90 heats the mixed refrigerant flowing out of the main refrigeration circuit 40 through the second regenerator section 92, so that the mixed refrigerant flows out of the compressor 11 after being heated, avoiding the risk of liquid slugging in the compressor 11, ensuring the operational reliability of the compressor 11, and enabling the mixed refrigerant to be recycled in the refrigeration system, thus achieving the environmental protection, energy saving and operational reliability of the refrigeration system.

[0042] In this embodiment, since the refrigeration branch 70 is connected to the refrigeration main branch 40, the gaseous refrigerant flowing out from the second evaporator 41 mixes with the gaseous refrigerant after being heated by the refrigeration evaporator 72 and flows into the second regenerating section 92. After being heated by the second regenerating section 92, it flows into the inlet of the compressor 11.

[0043] In this embodiment, the first regenerative structure 90 is one of an evaporative condenser 13, a shell-and-tube heat exchanger, and a plate heat exchanger.

[0044] like Figure 1As shown, the refrigeration system also includes a heat exchange structure 100. The heat exchange structure 100 includes a first heat exchange section 110 and a second heat exchange section 120. One end of the first heat exchange section 110 is connected to the first regenerator section 91, and the other end of the first heat exchange section 110 is optionally connected to at least one of the first refrigeration branch 20 and the second refrigeration branch 30. The second heat exchange section 120 is disposed on the main refrigeration circuit 40. The second heat exchange section 120 is used for heat exchange with the first heat exchange section 110. Thus, by adding the heat exchange structure 100 to the regenerator section 90, the gaseous refrigerant from the gaseous outlet of the gas-liquid separator 12 is pre-cooled by the first regenerator section 91 and then cooled again by the first heat exchange section 110 of the heat exchange structure 100. This allows the gaseous refrigerant to undergo two cooling cycles, further improving the refrigeration efficiency of the first evaporator 22 and the second evaporator 41, and enhancing the reliability of the storage tank's freezing and extreme freezing environments. Meanwhile, the gaseous refrigerant flowing out of the second evaporator 41 is heated by the second heat exchange section 120 and then mixed with the gaseous refrigerant flowing out of the refrigeration evaporator 72. It is then further heated by the second regeneration section 92, which further increases the temperature of the mixed refrigerant flowing into the compressor 11. This allows the mixed refrigerant to be heated more fully and returned to the compressor 11, further ensuring the operational reliability and safety of the compressor 11 and improving the environmental protection, energy saving, and operational reliability of the refrigeration system.

[0045] like Figure 1As shown, the refrigeration circuit 10 also includes a condenser 13, one end of which is connected to the outlet of the compressor 11, and the other end of which is connected to the inlet of the gas-liquid separator 12. The refrigeration circuit 10 further includes a filter structure 14, an anti-condensation structure 15, and a heat dissipation structure 16. The filter structure 14 is disposed in the connecting flow path between the condenser 13 and the inlet of the gas-liquid separator 12 to filter the condensed mixed refrigerant; and / or, one end of the anti-condensation structure 15 is connected to the condenser 13, and the other end of the anti-condensation structure 15 is connected to the inlet of the gas-liquid separator 12; and / or, the heat dissipation structure 16 is disposed on one side of the condenser 13 to dissipate heat from the condenser 13. In this way, the refrigeration circuit 10 cools and condenses the high-temperature, high-pressure gaseous mixed refrigerant flowing out of the compressor 11 through the condenser 13, making the mixed refrigerant a two-phase gas-liquid mixture, ensuring the separation reliability of the gas-liquid separator 12, and also ensuring the operational reliability of the refrigeration system. Meanwhile, the filter structure 14 filters the condensed mixed refrigerant, ensuring its cleanliness and preventing damage to components in the refrigeration system from moisture and impurities. This ensures the operational safety of the refrigeration system and extends its service life. Simultaneously, the anti-condensation structure 15 utilizes the heat from the mixed refrigerant to seal and heat the perimeter of the storage box door, increasing the temperature of the area in contact with the external environment. This prevents frost and condensation caused by temperature differences between the storage box and the external environment, ensuring the safe operation and use of the storage box. Furthermore, the heat dissipation structure 16, located on one side of the condenser 13, cools the condenser 13, ensuring its condensation reliability and efficiency, and consequently, the operational reliability and efficiency of the refrigeration system.

[0046] In this embodiment, the condenser 13 includes a condenser tube.

[0047] Specifically, the anti-condensation structure 15 is also tubular, with one branch of the condenser tube forming the anti-condensation structure 15.

[0048] In this embodiment, the heat dissipation structure 16 is a fan.

[0049] This application also provides a storage box, which includes a box body and the aforementioned refrigeration system. The box body has a storage space, which includes a refrigeration zone, a first freezer zone, and a second freezer zone. The aforementioned refrigeration system is disposed within the storage space. The refrigeration evaporator 72 of the refrigeration system is located in the refrigeration zone, the first evaporator 22 of the refrigeration system is located in the first freezer zone, and the second evaporator 41 of the refrigeration system is located in the second freezer zone. In this way, the refrigeration system is disposed within the storage space of the box body, and by using the first evaporator 22, the second evaporator 41, and the refrigeration evaporator 72, the storage temperature of the first freezer zone, the second freezer zone, and the refrigeration zone is maintained, ensuring the reliability of multi-temperature zone storage in the storage box.

[0050] In this embodiment, the storage box also includes a temperature detection device and a control structure. The temperature detection device is mounted on the box body and includes a first temperature sensor and a second temperature sensor. The first and second temperature sensors are used to detect the temperatures at the first evaporator 22 and the second evaporator 41, respectively. The control structure is connected to both the first and second temperature sensors and the refrigeration system to control the refrigeration system based on the detection results of the first and second temperature sensors. Thus, the temperature detection device, through the first and second temperature sensors, detects the temperatures of the first and second freezing zones respectively, achieving real-time monitoring and precise measurement of the temperatures of the first and second freezing zones of the storage box. Simultaneously, the control structure can control the refrigeration system based on the detection results of the first and second temperature sensors, enabling the refrigeration system to monitor the precise temperatures of each zone in real time and automatically and accurately adjust the operating parameters of the refrigeration system. This achieves intelligent and automated operation of the storage box, ensuring high stability and uniformity of the storage environment and maximizing the safety of the stored items.

[0051] In this embodiment, both the first temperature detection element and the second temperature detection element are temperature sensors.

[0052] In this embodiment, the storage box also includes a door. The door is movably mounted on the box body. At least a portion of the anti-condensation structure 15 of the refrigeration system is arranged around the periphery of the door. By placing the anti-condensation structure 15 of the refrigeration system around the periphery of the door, precise and efficient local heating can be provided to the door area, effectively increasing the surface temperature of the door and ensuring it remains above the ambient dew point temperature. This completely eliminates condensation and frosting problems in the storage box, ensuring the long-term sealing reliability of the box body. It also avoids cold loss, equipment corrosion, and safety hazards caused by condensation, extending the service life of the storage box.

[0053] In this embodiment, pressure sensors are provided at both the outlet and the inlet of the compressor 11 to detect the suction and discharge pressures of the compressor 11.

[0054] Specifically, the storage box also includes an alarm device. The temperature sensor, pressure sensor, and alarm device are all connected to the control structure. The control structure controls the alarm device to turn on and off based on the detection data from the temperature sensor and pressure sensor.

[0055] Optionally, the alarm device is an alarm clock.

[0056] This application also provides a control method applicable to the aforementioned storage box. The control method includes: acquiring the temperature T1 at the first evaporator 22 and the temperature T2 at the second evaporator 41; and controlling the operation of the compressor 11 of the refrigeration system based on the temperatures T1 and T2. In this way, the refrigeration system controls the operating state of the compressor 11 through temperature feedback from the first evaporator 22 (T1) and the second evaporator 41 (T2), thereby increasing or decreasing the refrigeration efficiency of the refrigeration system. This ensures the freezing reliability of both the first and second freezing zones while balancing the cooling rate and operating energy efficiency.

[0057] In this embodiment, controlling the operation of the compressor 11 of the refrigeration system based on temperatures T1 and T2 includes: comparing temperature T1 with a first preset temperature range T10, and comparing temperature T2 with a second preset temperature range T20. The operation of the compressor 11 is adjusted based on the comparison results of temperature T1 with the first preset temperature range T10 and / or temperature T2 with the second preset temperature range T20. Thus, by comparing the real-time temperature with the preset target range, the fuzzy temperature requirement is transformed into precise control logic. Adjusting the operating state of the compressor 11 based on the differential comparison results makes the refrigeration system control more refined and intelligent, enabling the most appropriate adjustment measures to be taken for different temperature deviations, thereby improving the adaptability and efficiency of the refrigeration system control.

[0058] Specifically, based on the comparison results of temperature T1 with the first preset temperature range T10 and / or temperature T2 with the second preset temperature range T20, the operation of compressor 11 is adjusted, including: when temperature T1 is lower than the lower limit of the first preset temperature range T10 and temperature T2 is lower than the lower limit of the second preset temperature range T20, the operating frequency of compressor 11 is reduced to a first preset frequency value P1; when temperature T1 is higher than the upper limit of the first preset temperature range T10 or temperature T2 is higher than the upper limit of the second preset temperature range T20, the operating frequency of compressor 11 is increased to the second preset frequency value P2. Thus, when the temperatures of the first and second freezing zones are lower than the lower limit of the preset target range, it indicates that the cooling effect of the first and second freezing zones has met the requirements, and the operating frequency of compressor 11 in the refrigeration system needs to be reduced to the first preset frequency value P1. This avoids increasing the energy consumption of the refrigeration system due to continued high-frequency operation of compressor 11, keeping the refrigeration system in an energy-saving mode and improving its environmental friendliness. Meanwhile, when the temperature of the first freezing zone and the second freezing zone is higher than the upper limit of the preset target range, it indicates that the cooling effect of the first freezing zone and the second freezing zone is insufficient. It is necessary to control the operating frequency of the compressor 11 of the refrigeration system to increase to the second frequency preset value P2, thereby enhancing the cooling intensity of the refrigeration system, enhancing the cooling effect of the first freezing zone and the second freezing zone, and ensuring the storage reliability of the storage box.

[0059] In this embodiment, the refrigeration circuit 10 of the refrigeration system further includes a condenser 13 and a heat dissipation structure 16. One end of the condenser 13 is connected to the outlet of the compressor 11, and the other end of the condenser 13 is connected to the inlet of the gas-liquid separator 12. The heat dissipation structure 16 is disposed on one side of the condenser 13 in the refrigeration circuit 10 to dissipate heat from the condenser 13. The refrigeration system also includes a refrigeration branch 70, which includes a refrigeration throttling element 71 and a refrigeration evaporator 72 connected in series. One end of the refrigeration branch 70 is connected to the liquid outlet of the gas-liquid separator 12, and the other end of the refrigeration branch 70 is connected to the main refrigeration circuit 40. The control method further includes: acquiring temperatures T1 and T2. Based on temperatures T1 and T2, adjusting at least one of the rotational speed of the heat dissipation structure 16 and the opening ratio of the refrigeration branch 70 and the first refrigeration branch 20. In this way, adjusting the heat dissipation structure 16 can optimize the condensation effect, ensuring that the refrigeration system can maintain the best condensation effect under different refrigeration loads, thereby guaranteeing the efficient operation of the refrigeration system. At the same time, by adjusting the opening ratio of the refrigeration branch 70 and the first freezing branch 20, that is, by adjusting the distribution of liquid refrigerant and gaseous refrigerant flowing out of the gas-liquid separator 12, the distribution of refrigerant in the refrigeration branch 70 can be reduced or increased according to the temperature requirements of the first freezing zone and the second freezing zone. This realizes the flexibility of refrigerant distribution in the refrigeration system and also improves the automation control of the refrigeration system.

[0060] Specifically, based on temperatures T1 and T2, at least one of the following is adjusted: the rotation speed of the heat dissipation structure 16 and the opening ratio of the refrigeration branch 70 and the first freezing branch 20. This includes comparing temperature T1 with a first preset temperature range T10 and comparing temperature T2 with a second preset temperature range T20. Based on the comparison results of temperature T1 and the first preset temperature range T10 and / or temperature T2 and the second preset temperature range T20, at least one of the rotation speed of the heat dissipation structure 16 and the opening ratio of the refrigeration branch 70 and the first freezing branch 20 is adjusted. In this way, by comparing the real-time temperature with a preset target range, the fuzzy temperature requirement is transformed into precise control logic. Differential adjustment of the rotation speed of the heat dissipation structure 16 and the opening ratio of the refrigeration branch 70 and the first freezing branch 20 based on the comparison results makes the refrigeration system control more refined and intelligent, enabling the most appropriate adjustment measures to be taken for different temperature deviations, thus improving the adaptability and efficiency of the refrigeration system control.

[0061] Specifically, based on the comparison results of temperature T1 with the first preset temperature range T10 and / or temperature T2 with the second preset temperature range T20, at least one of the rotation speed of the heat dissipation structure 16 and the opening ratio of the refrigeration branch 70 and the first freezing branch 20 is adjusted, including: when temperature T1 is lower than the lower limit of the first preset temperature range T10 and temperature T2 is lower than the lower limit of the second preset temperature range T20, the rotation speed of the heat dissipation structure 16 is reduced to a first preset rotation speed value R1; and / or, the opening ratio of the refrigeration branch 70 and the first freezing branch 20 is increased to a first preset ratio value Z1; when temperature T1 is higher than the upper limit of the first preset temperature range T10 or temperature T2 is higher than the upper limit of the second preset temperature range T20, the rotation speed of the heat dissipation structure 16 is increased to a second preset rotation speed value R2; and / or, the opening ratio of the refrigeration branch 70 and the first freezing branch 20 is reduced to a second preset ratio value Z2. Thus, when the temperatures of the first and second freezing zones are below the lower limit of the preset target range, it indicates that the cooling effect of the first and second freezing zones has met the requirements. The rotation speed of the heat dissipation structure 16 of the refrigeration system needs to be reduced to a preset first rotation speed value R1 to prevent the heat dissipation structure 16 from continuing to operate at high speed, which would increase the energy consumption of the refrigeration system. This puts the refrigeration system in an energy-saving mode, improving its environmental friendliness. Simultaneously, the opening ratio of the refrigeration branch 70 and the first freezing branch 20 is also increased to a preset first ratio value Z1, ensuring that the gaseous and liquid refrigerants in the gas-liquid separator 12 are delivered to the first freezing branch 20 and the refrigeration branch 70 in a more equal proportion. This guarantees the freezing reliability of the first and second freezing zones while also enhancing the refrigeration effect of the refrigeration zone. When the temperatures of the first and second freezing zones are above the upper limit of the preset target range, it indicates that the cooling effect of the first and second freezing zones is insufficient. The rotation speed of the heat dissipation structure 16 of the refrigeration system needs to be increased to a preset second rotation speed value R2 to enhance the heat dissipation effect on the condenser 13, improve the condensation effect of the refrigeration system, and ensure the operational reliability of the refrigeration system. At the same time, the opening ratio of the refrigeration branch 70 and the first freezing branch 20 is reduced to the second ratio preset value Z2, so that the gaseous refrigerant and liquid refrigerant in the gas-liquid separator 12 are mainly transported to the first freezing branch 20, ensuring the freezing reliability of the first freezing zone and the second freezing zone, ensuring the cooling effect of the first freezing zone and the second freezing zone, and ensuring the storage reliability of the storage box.

[0062] In this embodiment, the first preset temperature range T10 satisfies: -89℃ ≤ T10 ≤ -86℃; and / or, the second preset temperature range T20 satisfies: -43℃ ≤ T20 ≤ -40℃; and / or, the first preset frequency value P1 satisfies: 43Hz ≤ P1 ≤ 47Hz; and / or, the second preset frequency value P2 satisfies: 73Hz ≤ P2 ≤ 77Hz. Thus, when temperature T1 is below -89℃ and temperature T2 is below -43℃, it is determined that the first and second freezing zones have achieved a cooling effect, and the frequency of compressor 11 is reduced to 45Hz. When temperature T1 is above -86℃, or temperature T2 is above -40℃, it is determined that the first and second freezing zones have not achieved a cooling effect, and the frequency of compressor 11 is increased to 75Hz.

[0063] Specifically, the first frequency preset value P1 satisfies: P1=45Hz, making the value of the first frequency preset value P1 more appropriate.

[0064] Specifically, the second frequency preset value P2 satisfies: P2=75Hz, making the value of the second frequency preset value P21 more appropriate.

[0065] In this embodiment, the first preset rotational speed R1 satisfies: 784rpm≤R1≤816rpm; and / or, the second preset rotational speed R2 satisfies: 1764rpm≤R2≤1836rpm; and / or, the first preset proportional ratio Z1 satisfies: 0.90≤Z1≤1.11; and / or, the second preset proportional ratio Z2 satisfies: 0.39≤Z2≤0.47. Thus, when temperature T1 is below -89℃ and temperature T2 is below -43℃, it is determined that the first and second freezing zones have achieved a cooling effect, and the rotational speed of the heat dissipation structure 16 is reduced to 800rpm, and the opening ratio of the refrigeration branch 70 and the first freezing branch 20 is controlled to be proportional. When temperature T1 is above -86℃, or temperature T2 is above -40℃, it is determined that the first and second freezing zones have not achieved a cooling effect, and the rotational speed of the heat dissipation structure 16 is increased to 1800rpm, and the opening ratio of the refrigeration branch 70 and the first freezing branch 20 is controlled to be 0.43.

[0066] Specifically, the first speed preset value R1 satisfies: R1=800rpm, making the value of the first speed preset value R1 more appropriate.

[0067] Specifically, the second speed preset value R2 satisfies: R2=1800rpm, making the value of the second speed preset value R2 more appropriate.

[0068] Specifically, the first ratio preset value Z1 satisfies: Z1=1, making the value of the first ratio preset value Z1 more appropriate.

[0069] Specifically, the second ratio preset value Z2 satisfies: Z2=0.43, making the value of the second ratio preset value Z2 more appropriate.

[0070] Specifically, both the first flow control valve 60 and the second flow control valve 80 are electronic expansion valves. These electronic expansion valves are connected to the control structure. The control structure controls the opening ratio of the refrigeration branch 70 and the first refrigeration branch 20 by controlling the second flow control valve 80 and the first flow control valve 60. When the opening ratio of the refrigeration branch 70 and the first refrigeration branch 20 is increased to the first preset value Z1, both the second flow control valve 80 and the first flow control valve 60 open by 50%, achieving proportional opening. When the opening ratio of the refrigeration branch 70 and the first refrigeration branch 20 is decreased to the second preset value Z2, the second flow control valve 80 opens by 30%, and the first flow control valve 60 opens by 70%, increasing the flow rate of the refrigerant in the first refrigeration branch 20.

[0071] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0072] The refrigeration circuit of the refrigeration system includes a compressor and a gas-liquid separator connected in series. A first refrigeration branch includes a first throttling element and a first evaporator arranged in series. One end of the first refrigeration branch is selectively connected to or disconnected from the gaseous outlet of the gas-liquid separator. A second refrigeration branch includes a second throttling element. One end of the second refrigeration branch is selectively connected to or disconnected from the gaseous outlet. The main refrigeration circuit includes a second evaporator. The other ends of both the first and second refrigeration branches are connected to one end of the main refrigeration circuit, and the other end of the main refrigeration circuit is connected to the compressor inlet. The refrigeration system has a freezing state and an extreme freezing state. When the refrigeration system is in the freezing state, the first refrigeration branch is connected to the gaseous outlet, and the second refrigeration branch is disconnected from the gaseous outlet, or the second refrigeration branch is connected to the gaseous outlet, and the first refrigeration branch is connected to the gaseous outlet. When the refrigeration system is in the extreme freezing state, both the second and first refrigeration branches are connected to the gaseous outlet. In this way, when users need to store different types of items, the refrigeration system inside the storage box compresses the mixed refrigerant into a high-temperature, high-pressure gas through the compressor in the refrigeration circuit. This gas is then condensed into a two-phase (gas and liquid) mixed refrigerant in the refrigeration circuit. Afterward, the gas-liquid separator separates the two-phase mixed refrigerant into gaseous and liquid refrigerant. If the user chooses to keep the refrigeration system in freezing mode, the first refrigeration branch connects to the gaseous outlet of the gas-liquid separator. This allows the gaseous refrigerant to pass through the first throttling device for pressure reduction and throttling, and then be evaporated and absorb heat by the first evaporator. The gaseous refrigerant flowing out of the first evaporator continues to flow to the second evaporator in the main refrigeration circuit, where it is evaporated and absorbs heat, thus lowering the temperature at both the first and second evaporators and achieving frozen storage in the storage box. Alternatively, the second refrigeration branch is connected to the gaseous outlet of the gas-liquid separator, allowing the gaseous refrigerant to pass through the second throttling device for pressure reduction and throttling, and then be evaporated and absorb heat by the second evaporator, thus lowering the temperature at the second evaporator and achieving frozen storage in the storage box. The first or second refrigeration branch is connected to the gaseous outlet of the gas-liquid separator, ensuring that the storage box meets the requirements of a freezing environment of -40℃ to -60℃, guaranteeing the storage of items such as microorganisms and freeze-dried vaccines. At this point, if the user chooses to put the refrigeration system in extreme freezing mode, both the first and second refrigeration branches are connected to the gaseous outlet of the gas-liquid separator. This allows the gaseous refrigerant in both branches to flow into the second evaporator, further reducing the temperature at the second evaporator. This ensures that the second evaporator meets the requirements of an extreme freezing environment of -60℃ to -80℃, guaranteeing the storage of items such as blood, tissues, and cells. Simultaneously, it also ensures that the temperature at the first evaporator meets the requirements of a freezing environment of -40℃ to -60℃. Thus, the storage box can simultaneously meet the requirements of both freezing and extreme freezing environments, enabling it to store different types of items at the same time. This improves the storage versatility of the storage box and solves the problem of poor storage versatility in existing technologies.

[0073] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0074] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0075] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A refrigeration system characterized by, include: The refrigeration circuit (10) includes a compressor (11) and a gas-liquid separator (12) that are connected to each other. The first refrigeration branch (20) includes a first throttling element (21) and a first evaporator (22) arranged in series. One end of the first refrigeration branch (20) can be selectively connected to or disconnected from the gas outlet of the gas-liquid separator (12). The second refrigeration branch (30) includes a second throttling element (31), and one end of the second refrigeration branch (30) can be selectively connected to or disconnected from the gas outlet; The main refrigeration circuit (40) includes a second evaporator (41), the other end of the first refrigeration branch (20) and the other end of the second refrigeration branch (30) are both connected to one end of the main refrigeration circuit (40), and the other end of the main refrigeration circuit (40) is connected to the inlet of the compressor (11); The refrigeration system has a freezing state and an extreme freezing state. When the refrigeration system is in the freezing state, the first freezing branch (20) is connected to the gas outlet and the second freezing branch (30) is disconnected from the gas outlet, or the second freezing branch (30) is connected to the gas outlet and the first freezing branch (20) is disconnected from the gas outlet. When the refrigeration system is in the extreme freezing state, both the second freezing branch (30) and the first freezing branch (20) are connected to the gas outlet.

2. The refrigeration system of claim 1, wherein, The refrigeration system also includes: A switching valve (50) having an inlet, a first switching port, and a second switching port, the inlet being selectively connected to at least one of the first switching port and the second switching port, the inlet being connected to the gas outlet, the first switching port being connected to or disconnected from the first refrigeration branch (20), and the second switching port being used to connect to or disconnect from the second refrigeration branch (30); and / or, A first flow control valve (60) is provided on the first refrigeration branch (20) to control the flow rate of the mixed refrigerant in the first refrigeration branch (20).

3. The refrigeration system of claim 1, wherein, The refrigeration system also includes: The refrigeration branch (70) includes a refrigeration throttling device (71) and a refrigeration evaporator (72) connected in series. One end of the refrigeration branch (70) is connected to the liquid outlet of the gas-liquid separator (12), and the other end of the refrigeration branch (70) is connected to the main refrigeration line (40). A second flow control valve (80) is provided on the refrigeration branch (70) to control the flow rate of the mixed refrigerant in the refrigeration branch (70).

4. The refrigeration system of claim 1, wherein, The refrigeration system further includes a heat recovery structure (90), which comprises: The first reheating section (91) has one end connected to the gas outlet, and the other end of the first reheating section (91) may be connected to at least one of the first refrigeration branch (20) and the second refrigeration branch (30). The second reheat section (92) is connected at both ends to the main refrigeration circuit (40) and the inlet of the compressor (11), respectively. The second regenerating section (92) is used to exchange heat with the first regenerating section (91).

5. The refrigeration system of claim 4, wherein, The refrigeration system further includes a heat exchange structure (100); the heat exchange structure (100) includes: A first heat exchange section (110) is connected at one end to a first regenerating section (91), and the other end of the first heat exchange section (110) is optionally connected to at least one of the first refrigeration branch (20) and the second refrigeration branch (30). The second heat exchange section (120) is provided on the main refrigeration circuit (40); The second heat exchange section (120) is used to exchange heat with the first heat exchange section (110).

6. The refrigeration system of claim 1, wherein, The refrigeration circuit (10) further includes a condenser (13), one end of which is connected to the outlet of the compressor (11), and the other end of which is connected to the inlet of the gas-liquid separator (12); wherein, the refrigeration circuit (10) further includes: A filter structure (14) is provided in the connecting flow path between the inlet of the condenser (13) and the gas-liquid separator (12) to filter the condensed mixed refrigerant; and / or, An anti-condensation structure (15), one end of which is connected to the condenser (13), and the other end of which is connected to the inlet of the gas-liquid separator (12); and / or, A heat dissipation structure (16) is provided on one side of the condenser (13) to dissipate heat from the condenser (13).

7. A preservation case characterized by comprising: include: The cabinet has storage space, which includes a refrigeration area, a first freezer area, and a second freezer area; The refrigeration system according to any one of claims 1 to 6 is disposed in the storage space, wherein the refrigeration evaporator (72) of the refrigeration system is located in the refrigeration zone, the first evaporator (22) of the refrigeration system is disposed in the first freezing zone, and the second evaporator (41) of the refrigeration system is located in the second freezing zone.

8. The storage box according to claim 7, characterized in that, The storage box also includes: A temperature detection device is installed on the housing. The temperature detection device includes a first temperature detection element and a second temperature detection element. The first temperature detection element and the second temperature detection element are used to detect the temperature at the first evaporator (22) and the temperature at the second evaporator (41), respectively. The control structure is connected to both the first and second temperature sensors and the refrigeration system to control the refrigeration system based on the detection results of the first and second temperature sensors.

9. The storage box according to claim 7, characterized in that, The storage box also includes: The cabinet door is movably mounted on the cabinet body; At least a portion of the anti-condensation structure (15) of the refrigeration system is arranged around the periphery of the cabinet door.

10. The storage box according to claim 7, characterized in that, The storage box also includes: The pressure detection device includes a first pressure detection element and a second pressure detection element. The first pressure detection element is located at the outlet of the compressor (11), and the second pressure detection element is located at the inlet of the compressor (11) for detecting the gas pressure at the outlet and inlet of the compressor (11).

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