Low-temperature storage device based on liquid nitrogen

Abstract

The utility model relates to a low-temperature preservation device based on liquid nitrogen. According to the technical scheme, a heat preservation inner container is arranged in a refrigeration barrel, a plurality of air holes are evenly formed in the bottom of the heat preservation inner container, the lower portion, right opposite to the air holes, of the inner container is connected with an air collection cavity in a sealed mode, and the left side and the right side of the air collection cavity are communicated with air inlet pipes of circulating pumps installed on the left side and the right side of the bottom of the refrigeration barrel respectively. Exhaust ends of the left and right circulating pumps are respectively communicated with the lower ends of the air guide pipes, the upper ends of the left and right air guide pipes are respectively connected with the lower end of the middle part of the semicircular circulating pipe, and a plurality of air inlet nozzles are arranged on the circular arc surface of the inner side of the semicircular circulating pipe in a circumferential array manner and are respectively and fixedly inserted into the edge of the circumferential side wall of the upper end opening of the heat preservation liner; the upper portions of the front side wall and the rear side wall of the heat preservation inner container are fixedly inserted into the two ends of a semi-circular-ring air inlet pipe correspondingly, and the right end of the semi-circular-ring air inlet pipe is connected with a main air inlet pipe inserted into the right side wall of the refrigeration barrel. The utility model has the beneficial effects that the air circulation flow is enhanced, the uniformity is ensured, and the refrigeration effect is improved.

Description

Technical Field

[0001] This utility model belongs to the field of liquid nitrogen cryopreservation technology and relates to a cryopreservation device based on liquid nitrogen. Background Technology

[0002] Liquid nitrogen refrigeration, as a relatively practical cooling method, works by utilizing the extremely low temperature of liquid nitrogen to rapidly cool and freeze items. When liquid nitrogen comes into contact with refrigerated items, it quickly absorbs heat and vaporizes into nitrogen gas, releasing a significant amount of cold energy to achieve refrigeration or freezing. It is commonly used in sample storage. However, existing low-temperature storage devices, by directly introducing liquid nitrogen from the storage tank into the storage device, result in uneven distribution of the liquid nitrogen within the device. The air or objects surrounding the liquid nitrogen are rapidly cooled, while areas further away from the liquid nitrogen experience insufficient cooling, leading to poor refrigeration performance.

[0003] Therefore, this invention provides a cryogenic storage device based on liquid nitrogen to solve the above problems. Utility Model Content

[0004] In view of the problems existing in the prior art, this utility model discloses a cryogenic preservation device based on liquid nitrogen. The technical solution adopted includes a refrigeration barrel, with several support columns arranged in a circular array on the inner sidewall of the bottom of the refrigeration barrel. The top of the support columns is fixedly connected to an insulated inner liner. Several vent holes are evenly opened in the middle of the bottom of the insulated inner liner. A gas collection chamber is sealed and connected to the lower part of the inner liner opposite the vent holes. The left and right sides of the gas collection chamber are respectively opened and connected to the air inlet pipes of the circulation pumps installed on the left and right sides of the bottom of the refrigeration barrel. The exhaust of the left and right circulation pumps is... The air end is connected to the lower end of the air guide pipe that is attached to the outer side wall of the heat-insulating inner liner. The upper ends of the left and right air guide pipes are connected to the lower end of the middle part of the semi-circular circulation pipe. Several air inlets are arranged in a circular array on the inner arc surface of the semi-circular circulation pipe. The air inlets are fixedly inserted into the edge of the circumferential side wall of the upper opening of the heat-insulating inner liner. The symmetrical openings on the upper part of the front and rear side walls of the heat-insulating inner liner are fixedly inserted into the two ends of the semi-circular air inlet pipe. The right end of the semi-circular air inlet pipe is connected to the main air inlet pipe inserted into the right side wall of the refrigerator.

[0005] As a preferred embodiment of this utility model, several protruding ridges are provided horizontally between the gaps between two adjacent horizontal rows of the vent holes; by using protruding ridges, the container of the sample placed in the heat-insulating inner liner is prevented from blocking the vent holes at the bottom of the heat-insulating inner liner.

[0006] As a preferred embodiment of this utility model, the upper opening of the refrigerated container is screwed on with a lid.

[0007] As a preferred embodiment of this utility model, a sealing boss is provided on the lower side wall of the lid, facing the upper opening of the heat-insulating inner liner. By using a sealing boss, it is convenient to squeeze and seal between the sealing boss and the upper opening of the heat-insulating inner liner when the lid is tightened, thereby improving the sealing effect.

[0008] As a preferred embodiment of this utility model, a handle is fixedly installed in the middle of the upper side wall of the cover, and a pressure relief valve is installed on the left side of the handle.

[0009] In a preferred embodiment of this utility model, the right end of the main air intake pipe is connected to the liquid nitrogen storage tank via a pipeline.

[0010] The beneficial effects of this utility model are as follows: By setting an insulated inner liner inside the refrigeration container, and inserting several air inlets into the left and right outer walls of the upper end of the insulated inner liner, the outside of each air inlet is connected to a semi-circular circulation pipe. The bottom of the left and right semi-circular circulation pipes is connected to their respective circulation pumps through air guide pipes. This allows the circulation pumps to draw the sinking liquid nitrogen and cold air from the gas collection chamber at the lower end of the insulated inner liner back into the left and right semi-circular circulation pipes, and then discharge them back into the insulated inner liner through the air inlets for circulation. This creates an upward-inward and downward-outward gas flow inside the insulated inner liner, thereby effectively improving the uniformity of liquid nitrogen distribution inside the insulated inner liner and enhancing the refrigeration effect. Attached Figure Description

[0011] Figure 1 This is a cross-sectional view of the overall structure of this utility model;

[0012] Figure 2 This is a cross-sectional view of the refrigeration container of this utility model;

[0013] Figure 3 This is a top view of the interior of the refrigerated container of this utility model.

[0014] In the diagram: 1-Refrigerated container, 2-Circulation pump, 3-Gas pipe, 4-Semi-circular circulation pipe, 5-Semi-circular air inlet pipe, 6-Liquid nitrogen storage tank, 11-Support column, 12-Insulated inner liner, 13-Ventilation hole, 14-Gas collection chamber, 15-Main air inlet pipe, 16-Protruding ridge, 17-Lid, 171-Sealing boss, 172-Handle, 173-Pressure relief valve, 41-Air inlet nozzle. Detailed Implementation

[0015] Example 1

[0016] like Figures 1 to 3As shown, the present invention discloses a cryogenic storage device based on liquid nitrogen. The technical solution includes a refrigerated container 1. Several support columns 11 are arranged in a circular array on the inner sidewall of the bottom of the refrigerated container 1. An insulated inner liner 12 is fixedly connected to the top of each support column 11. Several vent holes 13 are evenly distributed in the middle of the bottom of the insulated inner liner 12. A gas collection chamber 14 is sealed to the lower part of the inner liner opposite to each vent hole 13. A main air inlet pipe 15 is inserted into the right sidewall of the refrigerated container 1. Several protruding ridges 16 are horizontally arranged between adjacent rows of vent holes 13. A lid 17 is screwed onto the upper opening of the refrigerated container 1. A sealing boss 171 is provided downwards on the lower sidewall of the lid 17, opposite the upper opening of the insulated inner liner 12. A handle 172 is fixedly installed in the middle of the upper sidewall of the lid 17. A pressure relief valve 17 is installed on the left side of the handle 172. 3. The left and right sides of the gas collection chamber 14 are respectively opened and connected to the air inlet pipes of the circulation pumps 2 installed on the left and right sides of the bottom of the refrigerator 1. The exhaust ends of the left and right circulation pumps 2 are respectively connected to the lower ends of the air guide pipes 3 that are attached to the outer side wall of the heat-insulating inner liner 12. The upper ends of the left and right air guide pipes 3 are respectively connected to the lower ends of the middle part of the semi-circular circulation pipe 4. Several air inlets 41 are arranged in a circular array on the inner arc surface of the semi-circular circulation pipe 4. The air inlets 41 are respectively fixedly inserted into the edge of the circumferential side wall of the upper opening of the heat-insulating inner liner 12. The upper symmetrical openings of the front and rear side walls of the heat-insulating inner liner 12 are respectively fixedly inserted into the two ends of the semi-circular air inlet pipe 5. The right end of the semi-circular air inlet pipe 5 is connected to the main air inlet pipe 15 inserted into the right side wall of the refrigerator 1. The right end of the main air inlet pipe 15 is connected to the liquid nitrogen storage tank 6 through a pipe.

[0017] The working principle of this utility model is as follows: In use, open the lid 17, place the sample or item to be refrigerated on the protruding ridge 16 at the bottom of the insulated inner liner 12, tighten the lid 17, open the valve on the liquid nitrogen storage tank 6, and introduce liquid nitrogen through the main air inlet pipe 15. After passing through both ends of the semi-circular air inlet pipe 5, the liquid nitrogen is introduced into the insulated inner liner 12. During the introduction process, the pressure relief valve 173 on the lid 17 needs to be opened to maintain pressure balance within the insulated inner liner 12. After the introduction is complete, close the valve on the liquid nitrogen storage tank 6 and simultaneously close the pressure relief valve 173. Then, the circulation pumps 2 on the left and right sides of the lower part of the heat-insulating inner liner 12 are started. Liquid nitrogen slowly flows to the bottom of the heat-insulating inner liner 12, cooling the air at the bottom. The cooled air is carried by the airflow formed by the circulation pump into the vent 13 at the bottom of the heat-insulating inner liner 12, and then enters the air collection chamber 14. Finally, it is circulated again into the left and right semi-circular circulation pipes 4 through the left and right air guide pipes 3, and then discharged into the upper part of the heat-insulating inner liner 12 through the air inlet 41 at the end, cooling the air at the upper and middle parts, thereby cooling the air in the entire heat-insulating inner liner 12 evenly and increasing the airflow.

[0018] Electrical connection methods or structures not described in detail in this article are existing technologies.

[0019] While the specific embodiments of this utility model have been described in detail above, this utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this utility model. Modifications or variations that do not involve creative labor are still within the protection scope of this utility model.

Claims

1. A cryogenic storage device based on liquid nitrogen, characterized in that: The refrigerator includes a refrigerated container (1). Several support columns (11) are arranged in a circular array on the inner sidewall of the bottom of the refrigerated container (1). The top of each support column (11) is fixedly connected to an insulated inner liner (12). Several vent holes (13) are evenly distributed in the middle of the bottom of the insulated inner liner (12). A gas collecting chamber (14) is sealed to the lower part of the inner liner directly opposite each vent hole (13). The left and right sides of the gas collecting chamber (14) are respectively opened and connected to the air inlet pipes of circulation pumps (2) installed on the left and right sides of the bottom of the refrigerated container (1). The exhaust ends of the left and right circulation pumps (2) are respectively connected to the outer sidewall of the insulated inner liner (12). The lower end of the air guide pipe (3) is connected, and the upper ends of the left and right air guide pipes (3) are respectively connected to the lower end of the middle part of the semi-circular circulation pipe (4). The inner arc surface of the semi-circular circulation pipe (4) is provided with several air inlets (41). The air inlets (41) are respectively fixedly inserted into the edge of the circumferential side wall of the upper opening of the heat-insulating inner liner (12). The upper symmetrical openings of the front and rear side walls of the heat-insulating inner liner (12) are respectively fixedly inserted into the two ends of the semi-circular air inlet pipe (5). The right end of the semi-circular air inlet pipe (5) is connected to the main air inlet pipe (15) inserted into the right side wall of the refrigerator (1).

2. The cryogenic preservation device based on liquid nitrogen according to claim 1, characterized in that: Several protruding ridges (16) are respectively arranged horizontally between the gaps between two adjacent horizontal rows of the vent holes (13).

3. The cryogenic preservation device based on liquid nitrogen according to claim 1, characterized in that: The upper opening of the refrigerated container (1) is screwed with a lid (17).

4. The cryogenic preservation device based on liquid nitrogen according to claim 3, characterized in that: A sealing boss (171) is provided on the lower side wall of the lid (17) at the part of the upper opening of the heat-insulating inner liner (12).

5. A cryogenic storage device based on liquid nitrogen according to claim 3, characterized in that: A handle (172) is fixedly installed in the middle of the upper side wall of the cover (17), and a pressure relief valve (173) is installed on the left side of the handle (172).

6. The cryogenic preservation device based on liquid nitrogen according to claim 1, characterized in that: The right end of the main air intake pipe (15) is connected to the liquid nitrogen storage tank (6) via a pipe.

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