Liquid nitrogen conveying pipeline and liquid nitrogen supply system

Abstract

The utility model discloses a liquid nitrogen conveying pipeline and a liquid nitrogen supply system. A vacuum interlayer (21) and an exhaust interlayer (22) are arranged on the pipe wall of the liquid nitrogen conveying pipeline; the liquid nitrogen conveying pipeline is further provided with a vacuumizing pipe opening (24) and a vacuum degree detection pipe opening (26), the vacuumizing pipe opening is communicated to the vacuum interlayer and used for vacuumizing the vacuum interlayer, and the vacuum degree detection pipe opening is communicated to the vacuum interlayer and used for arranging a vacuum degree detection instrument to detect the vacuum degree in the vacuum interlayer; a gas outlet of the gas-liquid separator (27) is communicated to the exhaust interlayer, the exhaust pipe opening (23) is communicated to the exhaust interlayer, and gas in liquid nitrogen conveyed in the liquid nitrogen conveying pipeline can be transferred into the exhaust interlayer through the gas-liquid separator and then is exhausted to the atmosphere through the exhaust pipe opening. When the vacuum degree in the vacuum interlayer of the liquid nitrogen conveying pipeline is reduced, the vacuum interlayer can be vacuumized through the vacuumizing pipe opening.

Description

Technical Field

[0001] The utility model relates to a liquid nitrogen supply device, in particular to a liquid nitrogen conveying pipeline and a liquid nitrogen supply system. Background Art

[0002] In the current liquid nitrogen supply system, most of the liquid nitrogen conveying pipelines adopted are pipelines with vacuum insulation on the pipe wall, that is, a vacuum interlayer is provided on the pipe wall of the pipeline to achieve the effect of heat insulation.

[0003] The current problem is that the vacuum interlayer of the liquid nitrogen conveying pipeline is evacuated and sealed at one time, that is, the vacuum interlayer of the liquid nitrogen conveying pipeline is pre-evacuated and then sealed when it is finished, and then it is put into use. During the use process, the vacuum interlayer cannot be evacuated repeatedly. If the vacuum degree of the liquid nitrogen conveying pipeline decreases due to aging and air leakage, the liquid nitrogen conveying pipeline can only be scrapped and a new liquid nitrogen conveying pipeline must be replaced. In this way, not only will it cause waste of the liquid nitrogen conveying pipeline, but also during the process of replacing the new liquid nitrogen conveying pipeline, the entire liquid nitrogen supply system has to stop running, resulting in the interruption of liquid nitrogen supply. Summary of the Invention

[0004] The purpose of the utility model is to provide a liquid nitrogen conveying pipeline and a liquid nitrogen supply system. A vacuum evacuation pipe orifice is provided for the vacuum interlayer in the liquid nitrogen conveying pipeline. When the vacuum degree in the vacuum interlayer decreases, the vacuum interlayer can be evacuated through the vacuum evacuation pipe orifice.

[0005] In order to achieve the above technical purpose, the utility model adopts the following technical solutions:

[0006] A liquid nitrogen conveying pipeline is used to convey liquid nitrogen. A vacuum interlayer and an exhaust interlayer are provided on the pipe wall of the liquid nitrogen conveying pipeline. A vacuum evacuation pipe orifice and a vacuum degree detection pipe orifice are also provided on the liquid nitrogen conveying pipeline. The vacuum evacuation pipe orifice is communicated with the vacuum interlayer and is used to evacuate the vacuum interlayer. The vacuum degree detection pipe orifice is communicated with the vacuum interlayer and is used to set a vacuum degree detection instrument to detect the vacuum degree in the vacuum interlayer. A gas-liquid separator and an exhaust pipe orifice are also provided on the liquid nitrogen conveying pipeline. The liquid inlet of the gas-liquid separator is communicated with the inner space of the liquid nitrogen conveying pipeline, the gas outlet of the gas-liquid separator is communicated with the exhaust interlayer, and the exhaust pipe orifice is communicated with the exhaust interlayer. For the liquid nitrogen conveyed in the liquid nitrogen conveying pipeline, the gas therein can be transferred to the exhaust interlayer by the gas-liquid separator and then discharged to the atmosphere through the exhaust pipe orifice.

[0007] Further, a check valve is provided at the vacuum evacuation pipe orifice.

[0008] Further, a gas heater is provided at the exhaust pipe orifice.

[0009] A liquid nitrogen supply system is used to supply liquid nitrogen to liquid nitrogen demand points. The liquid nitrogen supply system includes a liquid nitrogen supply source and a main conveying pipe. One end of the main conveying pipe is communicated with the liquid nitrogen supply source, and the liquid nitrogen demand points are communicated with the main conveying pipe. The liquid nitrogen supply source supplies liquid nitrogen to the liquid nitrogen demand points through the main conveying pipe. The main conveying pipe adopts the liquid nitrogen conveying pipe as described above, and a vacuum pump is configured for the main conveying pipe. The vacuum extraction pipe orifice of the main conveying pipe is connected to the suction port of the vacuum pump, and the vacuum pump can evacuate the vacuum interlayer of the main conveying pipe through the vacuum extraction pipe orifice.

[0010] Further, the liquid nitrogen demand points are several biological sample boxes, and the several biological sample boxes are all communicated with the main conveying pipe through branch pipes.

[0011] The liquid nitrogen conveying pipe and the liquid nitrogen supply system of the present utility model, compared with the prior art, have the beneficial effects that:

[0012] When the vacuum degree in the vacuum interlayer of the liquid nitrogen conveying pipe decreases, the vacuum pump can be used to evacuate the vacuum interlayer through the vacuum extraction pipe orifice, which can not only avoid waste of the liquid nitrogen conveying pipe, but also reduce the frequency of replacing the new liquid nitrogen conveying pipe, so as to ensure the effective supply of liquid nitrogen as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic diagram of the liquid nitrogen supply system of the present utility model;

[0014] Figure 2 is a schematic structural diagram of the liquid nitrogen conveying pipe of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The following uses specific embodiments to further illustrate the present utility model:

[0016] This embodiment provides a liquid nitrogen supply system, which is used to supply liquid nitrogen to liquid nitrogen demand points.

[0017] In this embodiment, the liquid nitrogen demand points are several biological sample boxes 8. That is to say, in this embodiment, the liquid nitrogen supply system is used to supply liquid nitrogen to several biological sample boxes 8.

[0018] See Figure 1 , the liquid nitrogen supply system of this embodiment includes a liquid nitrogen supply source 1 and a main conveying pipe 2. One end of the main conveying pipe 2 is communicated with the liquid nitrogen supply source 1, and the several biological sample boxes 8 are all communicated with the main conveying pipe 2 through branch pipes. In this way, the liquid nitrogen supply source 1 can supply liquid nitrogen to the biological sample boxes 8 through the main conveying pipe 2.

[0019] It should be noted that the liquid nitrogen supply source 1 generally refers to equipment or pipelines capable of supplying liquid nitrogen.

[0020] It should be noted that the main conveying pipe 2 adopts a pipe with a special structure, which is a liquid nitrogen conveying pipe designed specifically for conveying liquid nitrogen.

[0021] See Figure 2 , specifically,

[0022] The pipe wall of the liquid nitrogen conveying pipe has two sandwich spaces. Among them, the outer sandwich space is a vacuum sandwich 21, which is used to set up vacuum isolation to achieve the effect of heat insulation; the inner sandwich space is an exhaust sandwich 22, which is used to circulate the gasified gas (detailed description will be given later).

[0023] A number of vacuum pumping nozzles 24 are also provided on the liquid nitrogen conveying pipe. The vacuum pumping nozzles 24 communicate with the vacuum sandwich 21 and only communicate with the vacuum sandwich 21. A vacuum pump 5 should also be configured for the liquid nitrogen conveying pipe. The vacuum pumping nozzles 24 are used to connect to the suction port of the vacuum pump 5. In this way, the vacuum pump 5 can evacuate the vacuum sandwich 21 of the liquid nitrogen conveying pipe through the vacuum pumping nozzles 24, so that the vacuum sandwich 21 has the effect of vacuum isolation, and further achieves the effect of heat insulation.

[0024] It should be noted that a one-way valve is provided at the vacuum pumping nozzle 24. Through the vacuum pumping nozzle 24, only the gas in the vacuum sandwich 21 can be pumped out, and the gas cannot flow back. In this way, even if the vacuum pump 5 stops running, the vacuum degree can still be maintained in the vacuum sandwich 21.

[0025] A number of vacuum degree detection nozzles 26 are also provided on the liquid nitrogen conveying pipe. The vacuum degree detection nozzles 26 communicate with the vacuum sandwich 21 and only communicate with the vacuum sandwich 21. A corresponding vacuum degree detection instrument should be configured for the vacuum degree detection nozzles 26. The vacuum degree detection nozzles 26 are used to connect to the detection end nozzle of the vacuum degree detection instrument. In this way, the vacuum degree detection instrument can detect the vacuum degree in the vacuum sandwich 21 of the liquid nitrogen conveying pipe through the vacuum degree detection nozzles 26, so as to provide data support for the selection of the automatic start-stop operation timing of the vacuum pump 5.

[0026] A number of gas-liquid separators 27 are also provided on the liquid nitrogen conveying pipe. Those skilled in the art can understand that the gas-liquid separator 27 itself is a device of the prior art, which has a liquid inlet and a gas outlet, and can separate the gas in the liquid nitrogen.

[0027] On the liquid nitrogen delivery pipeline, the liquid inlet of the gas-liquid separator 27 communicates with the inner space of the liquid nitrogen delivery pipeline, that is, the space for delivering liquid nitrogen, and the gas outlet of the gas-liquid separator 27 communicates with the exhaust interlayer 22 of the liquid nitrogen delivery pipeline.

[0028] On the liquid nitrogen delivery pipeline, a number of exhaust pipe orifices 23 are also provided. The exhaust pipe orifices 23 communicate with the exhaust interlayer 22 and only communicate with the exhaust interlayer 22.

[0029] For the liquid nitrogen delivered in the liquid nitrogen delivery pipeline, the gas therein can be transferred by the gas-liquid separator 27 to the exhaust interlayer 22, and then discharged to the atmosphere through the exhaust pipe orifices 23, so as to ensure that the liquid nitrogen delivered in the liquid nitrogen delivery pipeline is as pure as possible.

[0030] In addition, since the gas discharged from the exhaust pipe orifices 23 has a low temperature, it may affect the surrounding atmospheric environment. To solve the above problems, in this embodiment, a gas heater 25 is also provided at the exhaust pipe orifices 23. The gas heater 25 can heat the gas discharged from the exhaust pipe orifices 23 to avoid affecting the environment.

[0031] The specific working principle of the liquid nitrogen supply system of this embodiment is as follows:

[0032] The liquid nitrogen supply source 1 supplies liquid nitrogen to the biological sample box 8 through the delivery main pipe 2. The delivery main pipe 2 uses the previously mentioned liquid nitrogen delivery pipeline, and a vacuum pump 5 is also configured for the delivery main pipe 2.

[0033] Before supplying liquid nitrogen, first turn on the vacuum pump 5, and evacuate the vacuum interlayer 21 of the delivery main pipe 2 through the vacuum extraction pipe orifice 24, so that the vacuum interlayer 21 is in a vacuum state, thereby achieving the effect of adiabatic heat preservation and preventing the temperature of the liquid nitrogen delivered in the delivery main pipe 2 from rising.

[0034] During the process of the delivery main pipe 2 delivering liquid nitrogen, a vacuum degree detection instrument configured at the vacuum degree detection pipe orifice 26 is used to continuously detect the vacuum degree in the vacuum interlayer 21. If the vacuum degree does not meet the standard, the vacuum pump 5 is started to evacuate the vacuum interlayer 21 again, so as to ensure that the vacuum interlayer 21 can always maintain a certain vacuum degree and ensure a continuous and good adiabatic heat preservation effect.

[0035] During the process of the delivery main pipe 2 delivering liquid nitrogen, the gas in the liquid nitrogen can be transferred by the gas-liquid separator 27 to the exhaust interlayer 22, and then discharged to the atmosphere through the exhaust pipe orifices 23, so as to ensure that the liquid nitrogen delivered in the delivery main pipe 2 is as pure as possible.

[0036] In the liquid nitrogen delivery pipeline of this embodiment, the vacuum interlayer 21 is not evacuated and sealed once, but can be repeatedly evacuated through the vacuum extraction pipe orifice 24.

[0037] In this way, when the vacuum degree in the vacuum interlayer 21 decreases, the vacuum pump 5 can be used to evacuate the vacuum interlayer 21 through the evacuation pipe orifice 24, which can not only avoid waste of the liquid nitrogen delivery pipeline, but also reduce the frequency of "replacing the new liquid nitrogen delivery pipeline", so as to ensure the effective supply of liquid nitrogen as much as possible.

[0038] In addition, a corresponding vacuum degree detection instrument should be configured for the vacuum degree detection pipe orifice 26, and then set that "the vacuum pump 5 starts and stops according to the detection data of the vacuum degree detection instrument". If the vacuum degree in the vacuum interlayer 21 is insufficient, the vacuum pump 5 automatically starts to operate, so as to maintain the constancy of the vacuum degree in the vacuum interlayer 21 and ensure the heat insulation effect.

[0039] The above is only the preferred embodiment of the present utility model, and is not used to limit the protection scope of the present utility model. Therefore, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A liquid nitrogen delivery pipeline, which is used to deliver liquid nitrogen, characterized in that: The pipe wall of the liquid nitrogen delivery pipe is provided with a vacuum interlayer (21) and an exhaust interlayer (22); The liquid nitrogen delivery pipeline is also provided with a vacuum pipe opening (24) and a vacuum degree detection pipe opening (26). The vacuum pipe opening (24) is connected to the vacuum interlayer (21), and the vacuum pipe opening (24) is used to vacuum the vacuum interlayer (21). The vacuum degree detection pipe opening (26) is connected to the vacuum interlayer (21), and the vacuum degree detection pipe opening (26) is used to set a vacuum degree detection instrument to detect the vacuum degree in the vacuum interlayer (21); The liquid nitrogen delivery pipeline is also provided with a gas-liquid separator (27) and an exhaust pipe port (23). The liquid inlet of the gas-liquid separator (27) is connected to the inner space of the liquid nitrogen delivery pipeline, and the gas outlet of the gas-liquid separator (27) is connected to the exhaust interlayer (22). The exhaust pipe port (23) is connected to the exhaust interlayer (22). The gas in the liquid nitrogen transported in the liquid nitrogen transport pipeline can be transferred to the exhaust interlayer (22) through the gas-liquid separator (27), and then discharged to the atmosphere through the exhaust pipe port (23).

2. The liquid nitrogen delivery pipeline according to claim 1, characterized in that: A one-way valve is provided at the vacuum pipe port (24).

3. The liquid nitrogen delivery pipeline according to claim 1, characterized in that: A gas heater (25) is provided at the exhaust pipe opening (23).

4. A liquid nitrogen supply system, the liquid nitrogen supply system is used to supply liquid nitrogen to a liquid nitrogen demand point; Features: The liquid nitrogen supply system comprises a liquid nitrogen supply source (1) and a transport main pipe (2), one end of the transport main pipe (2) is connected to the liquid nitrogen supply source (1), the liquid nitrogen demand point is connected to the transport main pipe (2), and the liquid nitrogen supply source (1) supplies liquid nitrogen to the liquid nitrogen demand point through the transport main pipe (2); The transport main pipe (2) adopts the liquid nitrogen transport pipeline as described in any one of claims 1 to 3, and a vacuum pump (5) is configured for the transport main pipe (2). The vacuum pipe opening (24) of the transport main pipe (2) is connected to the suction port of the vacuum pump (5), and the vacuum pump (5) can evacuate the vacuum interlayer (21) of the transport main pipe (2) through the vacuum pipe opening (24).

5. The liquid nitrogen supply system according to claim 4, characterized in that: The liquid nitrogen demand points are a plurality of biological sample boxes (8), and the plurality of biological sample boxes (8) are all connected to the main transport pipe (2) via branch pipes.

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