Small liquid nitrogen generating device

Abstract

The utility model relates to the technical field of liquid nitrogen, in particular to a small liquid nitrogen generating device which comprises a cabinet, a man-machine interaction interface and a nitrogen using equipment port are installed on a machine shell of the cabinet, a plurality of trundles are installed on the bottom face of the cabinet, a heat dissipation filter screen is installed on a shell body of the cabinet, and a nitrogen processing chamber and a liquid nitrogen preparation chamber are arranged in the cabinet. The nitrogen treatment chamber is used for separating air into high-purity nitrogen, and the liquid nitrogen preparation chamber is used for storing liquefied nitrogen; the small-sized liquid nitrogen generating device has the beneficial effects that compared with a traditional molecular sieve, the small-sized liquid nitrogen generating device provided by the utility model is simpler in structure, more stable in gas production and smaller in overall volume and weight through a membrane separation technology; the problem that the existing liquid nitrogen generating device is difficult to meet the requirements of low-temperature physics and medical research is further solved; and high-purity liquid nitrogen can be prepared and taken at any time in most regions.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid nitrogen, in particular to a small liquid nitrogen generating device. Background Art

[0002] Liquid nitrogen is liquefied nitrogen, and the nitrogen content in the air is as high as 78%. Liquid nitrogen is widely used in freezing and transporting food, preserving living tissue and high-temperature superconductivity.

[0003] In the prior art, industrial liquid nitrogen is usually a by-product of the production of liquid oxygen and other products, but its purity is difficult to meet the requirements of low-temperature physics and medical research, and its transportation is time-consuming and labor-intensive.

[0004] Therefore, we need a small liquid nitrogen generator to solve the problem that existing liquid nitrogen generators are difficult to meet the requirements of low-temperature physics and medical research; it can meet the needs of making and taking high-purity liquid nitrogen in most areas. Utility Model Content

[0005] The utility model aims to provide a small liquid nitrogen generator to solve the problem that the existing liquid nitrogen generators mentioned in the background technology are difficult to meet the requirements of low-temperature physics and medical research; and can meet the needs of producing and taking high-purity liquid nitrogen in most areas.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a small liquid nitrogen generating device, comprising a cabinet, a human-machine interaction interface and a nitrogen equipment port are installed on the cabinet casing, a plurality of casters are installed on the bottom surface of the cabinet, a heat dissipation filter is installed on the cabinet shell, a nitrogen treatment chamber and a liquid nitrogen preparation chamber are arranged inside the cabinet, the nitrogen treatment chamber is used to separate high-purity nitrogen from air, and the liquid nitrogen preparation chamber is used to liquefy nitrogen and store it.

[0007] Preferably, a partition is fixed inside the cabinet, and the nitrogen treatment chamber and the liquid nitrogen preparation chamber are respectively distributed on the upper and lower sides of the partition.

[0008] Preferably, the nitrogen treatment chamber comprises an air compressor, a desiccant, a filter and a separation membrane, and the air compressor, the desiccant, the filter and the separation membrane are sequentially connected through pipelines.

[0009] Preferably, the air outlet of the air compressor is connected to the air inlet of a dryer through a pipe, the dryer is used to remove water from the air, and the air outlet of the dryer is connected to the air inlet of a filter through a pipe, the filter is used to remove residual water vapor in the air.

[0010] Preferably, the air outlet of the filter is connected to the air inlet of a separation membrane through a pipeline. The separation membrane is used to separate high-purity nitrogen from the air. The air outlet of the separation membrane is connected to the liquid nitrogen preparation chamber after passing through the partition through a pipeline.

[0011] Preferably, the liquid nitrogen preparation chamber comprises a nitrogen condenser, a refrigerator, a water cooler, a liquid outlet, an air outlet, an air inlet and a safety valve. An air inlet is provided on the surface of the nitrogen condenser, and an electromagnetic valve is installed at the other end of the air inlet. The air inlet receives high-purity nitrogen injected from the nitrogen treatment chamber. The nitrogen condenser is connected to the refrigerator through a flange, and the refrigerator is connected to the water cooler through a pipeline. The safety valve, liquid outlet and air outlet are all installed at the top of the nitrogen condenser.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The small liquid nitrogen generating device proposed by the utility model is simpler in structure than the traditional molecular sieve through membrane separation technology, and the gas production is more stable, and the overall volume and weight are also smaller; it further solves the problem that the existing liquid nitrogen generating device is difficult to meet the requirements of low-temperature physics and medical research; it can meet the needs of making and taking high-purity liquid nitrogen in most areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 This is a structural cross-sectional view of the utility model.

[0016] In the figure: cabinet 1, human-machine interface 2, nitrogen equipment port 3, casters 4, heat dissipation filter 5, air compressor 6, desiccant 7, filter 8, separation membrane 9, nitrogen condenser 10, refrigerator 11, water cooler 12, liquid outlet 13, air outlet 14, air inlet 15, safety valve 16. DETAILED DESCRIPTION

[0017] In order to make the purpose and technical solution of the utility model clearly and completely described, and the advantages more clearly understood, the embodiments of the utility model are further described in detail in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are part of the embodiments of the utility model, not all of the embodiments, and are only used to explain the embodiments of the utility model, and are not used to limit the embodiments of the utility model. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] See also Figure 1 to Figure 2The utility model provides a technical solution: a small liquid nitrogen generating device, comprising a cabinet 1, a human-machine interface 2 and a nitrogen equipment port 3 are installed on the casing of the cabinet 1, and a plurality of casters 4 are installed on the bottom surface of the cabinet 1, and a heat dissipation filter 5 is installed on the shell of the cabinet 1, and a nitrogen treatment chamber and a liquid nitrogen preparation chamber are arranged inside the cabinet 1, the nitrogen treatment chamber is used to separate high-purity nitrogen from air, and the liquid nitrogen preparation chamber is used to store nitrogen after liquefaction; a partition is fixed inside the cabinet 1, and the nitrogen treatment chamber and the liquid nitrogen preparation chamber are respectively distributed on the upper and lower sides of the partition.

[0019] The nitrogen treatment chamber includes an air compressor 6, a desiccant 7, a filter 8 and a separation membrane 9, which are connected in sequence through pipelines; the air outlet of the air compressor 6 is connected to the air inlet of the desiccant 7 through a pipeline, the desiccant 7 is used to remove water from the air, the air outlet of the desiccant 7 is connected to the air inlet of the filter 8 through a pipeline, the filter 8 is used to remove residual water vapor and solid particles in the air; the air outlet of the filter 8 is connected to the air inlet of the separation membrane 9 through a pipeline, the separation membrane 9 is used to separate high-purity nitrogen from the air, and the air outlet of the separation membrane 9 is connected to the liquid nitrogen preparation chamber after penetrating the partition through a pipeline.

[0020] The liquid nitrogen preparation room includes a nitrogen condenser 10, a refrigerator 11, a water cooler 12, a liquid outlet 13, a gas outlet 14, an air inlet 15 and a safety valve 16. The air inlet 15 is provided on the surface of the nitrogen condenser 10, and a solenoid valve is installed at the other end of the air inlet 15. The air inlet 15 receives the high-purity nitrogen injected from the nitrogen treatment chamber. The nitrogen condenser 10 is connected to the refrigerator 11 through a flange, and the refrigerator 11 is connected to the water cooler 12 through a pipeline. The safety valve 16, the liquid outlet 13 and the gas outlet 14 are all installed at the top of the nitrogen condenser 10.

[0021] In actual use, the device can extract high-purity nitrogen from the air and then liquefy it. The process is as follows: after the air is pressurized by the air compressor 6, it enters the desiccant 7 for preliminary water removal, and then enters the filter 8 to remove the remaining water vapor and solid particles. The dried air enters the separation membrane 9 to separate high-purity nitrogen, and finally enters the nitrogen condenser 10. The desiccant 7 and the filter 8 can be adjusted forward and backward, and each has its own advantages. The desiccant 7 at the front end can make the air entering the separation membrane 9 drier, and the filter 8 at the front end can preferentially filter particles to protect the desiccant 7.

[0022] The process of preparing liquid nitrogen includes nitrogen purging, hot tank start-up, nitrogen liquefaction, and automatic filling. First, the nitrogen purging process is that high-purity nitrogen enters the nitrogen condenser 10 from the air inlet 15 and is directly discharged from the liquid outlet 13. After the purge is completed, all liquid outlet valves are closed, and the refrigerator 11 and the water cooler 12 are started to start the hot tank. After the temperature in the nitrogen condenser 10 is lower than 195°C, the hot tank start-up is ended. If there is unused liquid nitrogen pre-stored in the tank, nitrogen purging and hot tank start-up are not required. When the liquid level in the nitrogen condenser 10 reaches the predetermined threshold, the automatic filling function is activated, and the liquid nitrogen enters the nitrogen equipment port 3 through the vacuum tube.

[0023] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A small liquid nitrogen generating device, comprising a cabinet (1), a human-machine interface (2) and a nitrogen equipment port (3) are installed on the housing of the cabinet (1), a plurality of casters (4) are installed on the bottom surface of the cabinet (1), and a heat dissipation filter (5) is installed on the housing of the cabinet (1), characterized in that: The cabinet (1) is provided with a nitrogen treatment chamber and a liquid nitrogen preparation chamber inside. The nitrogen treatment chamber is used to separate high-purity nitrogen from air, and the liquid nitrogen preparation chamber is used to liquefy nitrogen and store it.

2. A small liquid nitrogen generating device according to claim 1, characterized in that: A partition is fixed inside the cabinet (1), and the nitrogen treatment chamber and the liquid nitrogen preparation chamber are respectively distributed on the upper and lower sides of the partition.

3. A small liquid nitrogen generating device according to claim 1, characterized in that: The nitrogen treatment chamber comprises an air compressor (6), a desiccant (7), a filter (8) and a separation membrane (9), and the air compressor (6), the desiccant (7), the filter (8) and the separation membrane (9) are connected in sequence through pipelines.

4. A small liquid nitrogen generating device according to claim 3, characterized in that: The air outlet of the air compressor (6) is connected to the air inlet of a desiccant (7) through a pipeline, and the desiccant (7) is used to remove water from the air. The air outlet of the desiccant (7) is connected to the air inlet of a filter (8) through a pipeline, and the filter (8) is used to remove residual water vapor in the air.

5. A small liquid nitrogen generating device according to claim 3, characterized in that: The gas outlet end of the filter (8) is connected to the gas inlet end of the separation membrane (9) through a pipeline. The separation membrane (9) is used to separate high-purity nitrogen from the air. The gas outlet end of the separation membrane (9) is connected to the liquid nitrogen preparation chamber after passing through the partition through a pipeline.

6. A small liquid nitrogen generating device according to claim 1, characterized in that: The liquid nitrogen preparation chamber comprises a nitrogen condenser (10), a refrigerator (11), a water cooler (12), a liquid outlet (13), a gas outlet (14), an air inlet (15) and a safety valve (16); the nitrogen condenser (10) is provided with an air inlet (15) on its surface; a solenoid valve is installed at the other end of the air inlet (15); the air inlet (15) receives high-purity nitrogen injected from the nitrogen treatment chamber; the nitrogen condenser (10) is connected to the refrigerator (11) via a flange; the refrigerator (11) is connected to the water cooler (12) via a pipeline; and the safety valve (16), the liquid outlet (13) and the gas outlet (14) are all installed at the top of the nitrogen condenser (10).

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