Liquid nitrogen normal temperature storage device

Abstract

The application discloses a liquid nitrogen normal-temperature storage device, wherein a plurality of cooling plates of a cooling assembly are arranged in a liquid nitrogen tank in sequence from top to bottom and separate the liquid nitrogen tank into a plurality of cooling cavities, a communication port for communicating the upper and lower cooling cavities is arranged on each cooling plate, a cooling pipeline is installed on a flange, one end of each cooling pipeline is connected with a low-temperature refrigerator, the other end of each cooling pipeline penetrates through all the cooling plates above a cooling plate and is connected with the cooling plate for refrigerating the cooling plate, the liquid nitrogen tank is separated into a plurality of sub-zones arranged in sequence from top to bottom through the plurality of cooling plates, and the corresponding cooling plates are refrigerated through the plurality of cooling pipelines respectively, so that the nitrogen gas evaporated from the liquid nitrogen rises, meets the cooling plate above and is immediately condensed, the stability and safety of the liquid nitrogen normal-temperature storage are ensured to the maximum extent, the liquid nitrogen tank is uniformly cooled, the pressure fluctuation caused by the gasification of the liquid nitrogen is reduced, the liquid nitrogen normal-temperature stable storage is ensured, and leakage is avoided.

Description

Technical Field

[0001] This invention relates to the field of liquid nitrogen room temperature storage devices, and more particularly to a liquid nitrogen room temperature storage device. Background Technology

[0002] Liquid nitrogen is an inert, colorless, odorless, non-corrosive, non-flammable liquid with an extremely low temperature. Due to its low temperature and inertness, liquid nitrogen is widely used in industrial, biological, and medical fields. However, during the transportation and use of liquid nitrogen, existing liquid nitrogen storage tanks, due to prolonged storage at normal temperature and pressure, suffer from a high leakage rate. Furthermore, accidents during transportation can cause drastic changes within the tank, leading to a sudden increase in pressure and potentially causing the tank to rupture. Summary of the Invention

[0003] To address the technical problems existing in the background art, the present invention proposes a liquid nitrogen room temperature storage device.

[0004] The present invention proposes a liquid nitrogen room temperature storage device, comprising: a liquid nitrogen tank, a flange, a cooling assembly, and a cryogenic refrigerator;

[0005] The liquid nitrogen tank has an opening at the top, and a flange is installed at the opening. The cooling assembly includes multiple cooling plates and multiple cooling pipes. The multiple cooling plates are located inside the liquid nitrogen tank and are arranged sequentially from top to bottom to divide the liquid nitrogen tank into multiple cooling chambers. Each cooling plate has a connecting port for connecting the upper and lower cooling chambers. The cooling pipes are installed on the flange. One end of each cooling pipe is connected to a cryogenic refrigerator, and the other end passes through all the cooling plates above a cooling plate and is connected to the cooling plate to cool the cooling plate.

[0006] Preferably, the liquid nitrogen tank includes an inner tank and an outer tank, with an insulation cavity formed between the inner tank and the outer tank.

[0007] Preferably, the flange is provided with a nitrogen overflow port, which is connected to the insulation cavity through a pipeline.

[0008] Preferably, it also includes a nitrogen recovery unit, wherein the insulation cavity has a recovery port, and the nitrogen recovery unit is connected to the recovery port through a pipeline for recovering nitrogen.

[0009] Preferably, a nitrogen detection sensor is installed inside the liquid nitrogen tank. When the nitrogen detection sensor detects the presence of nitrogen in the liquid nitrogen tank, the cryogenic refrigerator cools the liquid nitrogen through cooling pipes and cooling plates.

[0010] Preferably, the nitrogen detection sensor is a pressure sensor. When the pressure sensor detects an increase in the pressure inside the liquid nitrogen tank, the cryogenic refrigerator cools the nitrogen through cooling pipes and cooling plates.

[0011] Preferably, each cooling chamber is equipped with a pressure sensor. When the pressure sensor detects an increase in the pressure inside the cooling chamber, the cryogenic refrigerator cools the cooling plate at the top of the cooling chamber.

[0012] Preferably, the liquid nitrogen tank is also equipped with a liquid level sensor. When the liquid level sensor detects that the liquid nitrogen level is in the Nth cooling chamber, the cryogenic refrigerator cools the cooling plate through a cooling pipe connected to the top cooling plate of the Nth cooling chamber.

[0013] Preferably, the bottom of the cooling plate is provided with condensation protrusions.

[0014] In this invention, the proposed liquid nitrogen ambient temperature storage device comprises multiple cooling plates located inside the liquid nitrogen tank, arranged sequentially from top to bottom to divide the tank into multiple cooling chambers. Each cooling plate has a connecting port for linking the upper and lower cooling chambers. Cooling pipes are mounted on flanges, with one end connected to a cryogenic refrigerator and the other end passing through all the cooling plates above a given cooling plate to cool it. Through this optimized design, the liquid nitrogen ambient temperature storage device divides the liquid nitrogen tank into multiple zones arranged sequentially from top to bottom using multiple cooling plates. Simultaneously, multiple cooling pipes cool the corresponding cooling plates, ensuring that the nitrogen gas evaporated from the liquid nitrogen rises and immediately cools and condenses upon encountering the upper cooling plate. This maximizes the stability and safety of the liquid nitrogen storage at ambient temperature, while also ensuring uniform cooling within the tank, reducing pressure fluctuations caused by liquid nitrogen vaporization, and thus guaranteeing stable ambient temperature storage and preventing leakage. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of one embodiment of a liquid nitrogen room temperature storage device proposed in this invention.

[0016] Figure 2 This is a schematic diagram of the internal structure of one embodiment of a liquid nitrogen room temperature storage device proposed in this invention. Detailed Implementation

[0017] like Figure 1 and 2 As shown, Figure 1 This is a schematic diagram of one embodiment of a liquid nitrogen room temperature storage device proposed in this invention. Figure 2 This is a schematic diagram of the internal structure of one embodiment of a liquid nitrogen room temperature storage device proposed in this invention.

[0018] Reference Figure 1 and 2 The present invention proposes a liquid nitrogen room temperature storage device, comprising: a liquid nitrogen tank, a flange 2, a cooling assembly and a cryogenic refrigerator 4;

[0019] The liquid nitrogen tank has an opening at the top, and a flange 2 is installed at the opening. The cooling assembly includes multiple cooling plates 31 and multiple cooling pipes 32. The multiple cooling plates 31 are located inside the liquid nitrogen tank and are arranged sequentially from top to bottom to divide the liquid nitrogen tank into multiple cooling chambers. Each cooling plate 31 is provided with a connecting port for connecting the upper and lower cooling chambers. The cooling pipes 32 are installed on the flange 2. One end of each cooling pipe 32 is connected to the cryogenic refrigerator 4, and the other end passes through all the cooling plates 31 above a cooling plate 31 and is connected to the cooling plate 31 to cool the cooling plate 31.

[0020] In this embodiment, the proposed liquid nitrogen ambient temperature storage device comprises multiple cooling plates located inside the liquid nitrogen tank, arranged sequentially from top to bottom to divide the tank into multiple cooling chambers. Each cooling plate has a connecting port for linking the upper and lower cooling chambers. Cooling pipes are mounted on flanges, with one end connected to a cryogenic refrigerator and the other end passing through all the cooling plates above a given cooling plate to cool it. Through this optimized design, the liquid nitrogen ambient temperature storage device divides the liquid nitrogen tank into multiple zones arranged sequentially from top to bottom using multiple cooling plates. Simultaneously, multiple cooling pipes cool the corresponding cooling plates, ensuring that the nitrogen gas evaporated from the liquid nitrogen rises and immediately cools and condenses upon encountering the upper cooling plate. This maximizes the stability and safety of the liquid nitrogen ambient temperature storage, while ensuring uniform cooling within the tank, reducing pressure fluctuations caused by liquid nitrogen vaporization, and thus guaranteeing stable ambient temperature storage and preventing leakage.

[0021] In the specific design of the liquid nitrogen tank, the liquid nitrogen tank includes an inner tank 11 and an outer tank 12, with an insulation cavity formed between the inner tank 11 and the outer tank 12. The insulation cavity serves to insulate against heat and reduce the influence of ambient temperature.

[0022] In a further specific embodiment, a nitrogen overflow port is provided on flange 2, and the nitrogen overflow port is connected to the insulation cavity through a pipeline; after the low-temperature nitrogen gas evaporated in the inner tank overflows from the overflow port, it enters the insulation cavity between the inner and outer tanks as an insulation medium, further improving the insulation effect of the liquid nitrogen tank.

[0023] Furthermore, this embodiment also includes a nitrogen recovery unit 5, which has a recovery port on the insulation cavity. The nitrogen recovery unit 5 is connected to the recovery port through a pipeline for recovering nitrogen. In the specific selection of the nitrogen recovery device, a nitrogen purification device and an air compressor can be used to realize the recovery and reuse of excess nitrogen.

[0024] To accurately monitor the evaporation of liquid nitrogen within the liquid nitrogen tank, a nitrogen detection sensor is installed inside the tank. When the sensor detects nitrogen, the cryogenic refrigerator 4 activates cooling via cooling pipes 32 and cooling plates 31. The cryogenic refrigerator 4 only activates cooling via cooling pipes 32 and cooling plates 31 when nitrogen is detected, effectively saving energy.

[0025] When liquid nitrogen evaporates into nitrogen gas, it causes a change in the internal pressure inside the liquid nitrogen tank. Therefore, in the specific selection of the nitrogen detection sensor, a pressure sensor is used to detect nitrogen by detecting the pressure. When the pressure sensor detects an increase in pressure inside the liquid nitrogen tank, the cryogenic refrigerator 4 cools the tank through the cooling pipes 32 and the cooling plate 31.

[0026] In the specific arrangement of the pressure sensors, each cooling chamber is equipped with a pressure sensor. When nitrogen gas is generated in a cooling chamber, it causes a change in pressure within that chamber. The pressure sensor in the cooling chamber can immediately detect this pressure change, ensuring sensitivity in nitrogen detection. When the pressure sensor detects an increase in pressure within the cooling chamber, the cryogenic refrigerator 4 cools the cooling plate 31 at the top of the cooling chamber, ensuring direct cooling of the chamber. Simultaneously, when nitrogen gas rises and encounters the nearest cooling plate, it cools down and condenses.

[0027] To achieve precise control, a liquid nitrogen tank is also equipped with a liquid level sensor. The liquid level sensor determines which cooling chamber the liquid nitrogen level is in, thus cooperating with the nitrogen detection mechanism to accurately detect nitrogen levels and precisely control the cooling of the corresponding cooling plate. That is, when the liquid level sensor detects that the liquid nitrogen level is in the Nth cooling chamber, the cryogenic refrigerator 4 cools the cooling plate 31 through the cooling pipe 32 connected to the top cooling plate 31 of the Nth cooling chamber.

[0028] In other specific embodiments, the bottom of the cooling plate 31 is provided with a condensation protrusion 311. By designing the condensation protrusion, on the one hand, the heat exchange area is increased, and on the other hand, it helps the water droplets condensed by nitrogen at the bottom of the cooling plate to gather on the condensation protrusion and then fall back into the liquid nitrogen.

[0029] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A liquid nitrogen room temperature storage device, characterized in that, include: Liquid nitrogen tank, flange (2), cooling components and cryogenic refrigerator (4); The liquid nitrogen tank has an opening at the top, and a flange (2) is installed at the opening. The cooling assembly includes multiple cooling plates (31) and multiple cooling pipes (32). The multiple cooling plates (31) are located inside the liquid nitrogen tank and are arranged sequentially from top to bottom to divide the liquid nitrogen tank into multiple cooling chambers. Each cooling plate (31) has a connecting port for connecting the upper and lower cooling chambers. The cooling pipes (32) are installed on the flange (2). One end of each cooling pipe (32) is connected to the cryogenic refrigerator (4), and the other end passes through all the cooling plates (31) above a cooling plate (31) and is connected to the cooling plate (31) for cooling the cooling plate (31). The liquid nitrogen tank includes an inner tank (11) and an outer tank (12), with an insulation cavity formed between the inner tank (11) and the outer tank (12); The flange (2) is provided with a nitrogen overflow port, which is connected to the insulation cavity through a pipeline; It also includes a nitrogen recovery unit (5), the heat insulation cavity has a recovery port, and the nitrogen recovery unit (5) is connected to the recovery port through a pipeline for recovering nitrogen; The liquid nitrogen tank is also equipped with a liquid level sensor. When the liquid level sensor detects that the liquid nitrogen level is in the Nth cooling chamber, the cryogenic refrigerator (4) cools the cooling plate (31) through the cooling pipe (32) connected to the cooling plate (31) at the top of the Nth cooling chamber.

2. The liquid nitrogen room temperature storage device according to claim 1, characterized in that, The liquid nitrogen tank is equipped with a nitrogen detection sensor. When the nitrogen detection sensor detects that there is nitrogen in the liquid nitrogen tank, the cryogenic refrigerator (4) cools the tank through the cooling pipe (32) and the cooling plate (31).

3. The liquid nitrogen room temperature storage device according to claim 2, characterized in that, The nitrogen detection sensor uses a pressure sensor. When the pressure sensor detects an increase in pressure inside the liquid nitrogen tank, the cryogenic refrigerator (4) cools the nitrogen through the cooling pipe (32) and the cooling plate (31).

4. The liquid nitrogen room temperature storage device according to claim 3, characterized in that, Each cooling chamber is equipped with a pressure sensor. When the pressure sensor detects an increase in pressure inside the cooling chamber, the cryogenic refrigerator (4) cools the cooling plate (31) on top of the cooling chamber.

5. The liquid nitrogen room temperature storage device according to claim 1, characterized in that, The bottom of the cooling plate (31) is provided with condensation protrusions (311).

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