CN111720726A - A Large Diameter Low Volatile Loss Dewar - Google Patents

A Large Diameter Low Volatile Loss Dewar Download PDF

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CN111720726A
CN111720726A CN201910216140.5A CN201910216140A CN111720726A CN 111720726 A CN111720726 A CN 111720726A CN 201910216140 A CN201910216140 A CN 201910216140A CN 111720726 A CN111720726 A CN 111720726A
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cylinder
liquid helium
dewar
inner cylinder
outer cylinder
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陈培
贾振俊
茆雪健
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Beihang University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
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    • F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
    • F17C1/02—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge involving reinforcing arrangements
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
    • F17C1/02—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge involving reinforcing arrangements
    • F17C1/08—Integral reinforcements, e.g. ribs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
    • F17C1/12—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge with provision for thermal insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
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    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/005—Details of vessels or of the filling or discharging of vessels for medium-size and small storage vessels not under pressure
    • F17C13/006—Details of vessels or of the filling or discharging of vessels for medium-size and small storage vessels not under pressure for Dewar vessels or cryostats
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    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
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    • F17C2203/013—Reinforcing means in the vessel, e.g. columns
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    • F17C2203/00—Vessel construction, in particular walls or details thereof
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    • F17C2203/0304—Thermal insulations by solid means
    • F17C2203/0308—Radiation shield
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0602—Wall structures; Special features thereof
    • F17C2203/0612—Wall structures
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    • F17C2203/0631—Three or more walls
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    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0636—Metals
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    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/01—Mounting arrangements
    • F17C2205/0123—Mounting arrangements characterised by number of vessels
    • F17C2205/013—Two or more vessels
    • F17C2205/0149—Vessel mounted inside another one
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    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
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    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
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    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F17C2221/016—Noble gases (Ar, Kr, Xe)
    • F17C2221/017—Helium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F17C2270/00—Applications
    • F17C2270/05—Applications for industrial use
    • F17C2270/0509—"Dewar" vessels

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Abstract

本发明公开了一种满足实验操作的大口径低挥发损耗的液氦杜瓦装置。包括外筒，悬吊在外筒内的内筒，还包括嵌套在内筒中的液氦筒，还包括连接实验设备的伸入杆。其特征在于：所述液氦筒外部有外筒和内筒两层结构，所述内筒和外筒之间通过细不锈钢丝悬吊固定，降低两层间的热传导功率；液氦筒和外筒之间馈线管是螺旋的细波纹管，增加了传导热距离；内筒和液氦筒的焊接法兰采用厚法兰连接，减少沿液氦筒向下传导的热流；外筒，内筒，液氦筒侧壁均采用波纹管设计，液氦筒波纹管延长热传导距离，降低挥发损耗，波纹管还可以提供抗弯刚度；内筒底板是铝辐射板，所述外筒、内筒侧壁和辐射板中心开通气孔，外筒通气孔安装有真空阀，所述真空阀定期抽出挥发的氦气，保证外筒和内筒之间，内筒和液氮筒之间，液氮筒和液氦筒之间的真空度。本发明提供的杜瓦装置，解决了大口径实验杜瓦高漏热的问题，提高了杜瓦的保温性能，降低了液氦的挥发损耗。

Figure 201910216140

The invention discloses a large-diameter and low-volatility-loss liquid helium Dewar device that satisfies experimental operation. It includes an outer cylinder, an inner cylinder suspended in the outer cylinder, a liquid helium cylinder nested in the inner cylinder, and an extending rod connecting the experimental equipment. It is characterized in that: the outside of the liquid helium cylinder has a two-layer structure of an outer cylinder and an inner cylinder, and the inner cylinder and the outer cylinder are suspended and fixed by a thin stainless steel wire to reduce the heat conduction power between the two layers; The feeder pipe between the cylinders is a spiral thin corrugated pipe, which increases the heat conduction distance; the welding flange of the inner cylinder and the liquid helium cylinder is connected by a thick flange to reduce the heat flow down the liquid helium cylinder; the outer cylinder and the inner cylinder are connected by thick flanges. , the side walls of the liquid helium cylinder are designed with bellows, the bellows of the liquid helium cylinder prolongs the heat conduction distance, reduces the volatilization loss, and the bellows can also provide bending stiffness; A vent hole is opened in the center of the wall and the radiant plate, and a vacuum valve is installed in the vent hole of the outer cylinder. The vacuum between the liquid helium cylinders. The Dewar device provided by the invention solves the problem of high heat leakage of the large-caliber experimental Dewar, improves the thermal insulation performance of the Dewar, and reduces the volatilization loss of liquid helium.

Figure 201910216140

Description

一种大口径低挥发损耗杜瓦A Large Diameter Low Volatile Loss Dewar

技术领域technical field

本发明属于低温液体储存领域，具体涉及一种大口径杜瓦容器。The invention belongs to the field of cryogenic liquid storage, in particular to a large-diameter Dewar container.

背景技术Background technique

杜瓦装置也叫低温容器，是由苏格兰物理学家和化学家詹姆斯-杜瓦爵士发明的。杜瓦装置是一种储存低温液体较理想容器和工具，具有储存能力强、易于运输、使用便利、操作简易、安全性好等特点。The Dewar apparatus, also called a cryogenic vessel, was invented by Scottish physicist and chemist Sir James Dewar. Dewar device is an ideal container and tool for storing cryogenic liquid. It has the characteristics of strong storage capacity, easy transportation, convenient use, simple operation and good safety.

液氦在一个标准大气压下温度可以达到4.2K，很多低温超导实验经常需要依靠液氦浸泡产生一个恒定的低温环境。液氦主要来源于天然气，属于不可再生资源。The temperature of liquid helium can reach 4.2K at a standard atmospheric pressure, and many low-temperature superconductivity experiments often rely on liquid helium immersion to generate a constant low temperature environment. Liquid helium is mainly derived from natural gas, which is a non-renewable resource.

现有的液氦储存杜瓦大都采用细口径的双层容器的方案，其包括罐体和顶盖，其中罐体包括内筒和外筒。其中内筒和外筒之间是真空层，用于隔热。在许多科研和工程领域，经常需要将大尺寸的实验器件伸入液氦杜瓦中进行浸泡，现有的实验杜瓦大都是采取直接增大顶盖的尺寸的方案，这样加速了杜瓦内部液氦的挥发速率，增加了杜瓦装置的液氦损耗。Most of the existing liquid helium storage Dewars adopt the scheme of a thin-bore double-layer container, which includes a tank body and a top cover, wherein the tank body includes an inner cylinder and an outer cylinder. The vacuum layer between the inner cylinder and the outer cylinder is used for heat insulation. In many scientific research and engineering fields, it is often necessary to extend large-sized experimental devices into the liquid helium Dewar for immersion. Most of the existing experimental Dewars adopt the scheme of directly increasing the size of the top cover, which accelerates the internalization of the Dewar. The volatilization rate of liquid helium increases the loss of liquid helium in the Dewar device.

发明内容SUMMARY OF THE INVENTION

本发明针对现有技术问题做出改进，即发明一种满足实验操作的大口径、高保温性能、低挥发率的杜瓦装置。The present invention makes improvements in view of the existing technical problems, that is, to invent a Dewar device with large diameter, high heat preservation performance and low volatilization rate that satisfies the experimental operation.

针对上述技术问题：本发明提供的技术方案为：一种满足实验操作的大口径低挥发损耗的液氦杜瓦装置。包括外筒，悬吊在外筒内的内筒，还包括嵌套在内筒中的液氦筒，还包括连接实验设备的伸入杆。其特征在于：所述液氦筒外部有外筒和内筒两层结构，所述内筒和外筒之间通过细不锈钢丝悬吊固定；外筒和液氦筒之间使用螺旋波纹管作为馈线管；内筒和液氦筒的焊接法兰采用厚法兰连接；外筒，内筒，液氦筒侧壁均采用波纹管设计；内筒底板是铝辐射板，所述外筒、内筒侧壁和辐射板中心开通气孔，外筒通气孔安装有真空阀，所述真空阀定期抽出挥发的氦气，保证外筒和内筒之间，内筒和液氮筒之间，液氮筒和液氦筒之间的真空度。In view of the above technical problems: the technical solution provided by the present invention is: a liquid helium Dewar device with large diameter and low volatilization loss that satisfies the experimental operation. It includes an outer cylinder, an inner cylinder suspended in the outer cylinder, a liquid helium cylinder nested in the inner cylinder, and a protruding rod connecting the experimental equipment. It is characterized in that: the liquid helium cylinder has a two-layer structure of an outer cylinder and an inner cylinder, and the inner cylinder and the outer cylinder are suspended and fixed by a thin stainless steel wire; a spiral bellows is used between the outer cylinder and the liquid helium cylinder as the inner cylinder. Feeder tube; the welding flanges of the inner tube and the liquid helium tube are connected by thick flanges; the outer tube, the inner tube and the side walls of the liquid helium tube are all designed with bellows; the bottom plate of the inner tube is an aluminum radiant plate, the outer tube, the inner tube The side wall of the cylinder and the center of the radiant plate are opened with a vent hole, and a vacuum valve is installed in the vent hole of the outer cylinder. vacuum between the cylinder and the liquid helium cylinder.

基于上述满足实验操作的大口径低挥发损耗的液氦杜瓦装置，阻挡或降低了热传导，热辐射，热对流三种漏热形式。其中通过不锈钢丝悬吊的方式，将原本液氦杜瓦的顶盖处的温度从室温降低至某一温度，顶盖温度稳定后会远远低于室温，内筒与室温状态的外筒的热传导途径是三根悬吊不锈钢丝，降低两层间的热传导功率，将馈线管设计成螺旋型，可以增加外筒顶盖与液氦筒顶盖的热传导距离，同时外筒和内筒之间是真空层，相当于增加了一层冷屏，阻止了大口径液氦杜瓦开口顶盖处的热传导途径。Based on the large-diameter and low-volatility-loss liquid helium Dewar device that satisfies the above-mentioned experimental operation, the three heat leakage forms of heat conduction, heat radiation and heat convection are blocked or reduced. Among them, the temperature of the top cover of the original liquid helium Dewar is lowered from room temperature to a certain temperature by means of stainless steel wire suspension. After the temperature of the top cover is stabilized, it will be much lower than room temperature. The heat conduction path is three suspended stainless steel wires to reduce the heat conduction power between the two layers. The feeder tube is designed into a spiral shape, which can increase the heat conduction distance between the top cover of the outer cylinder and the top cover of the liquid helium cylinder. The vacuum layer is equivalent to adding a layer of cold shield, which prevents the heat conduction path at the open top cover of the large-diameter liquid helium Dewar.

进一步，液氦杜瓦侧壁采用两端管焊接，下部是普通圆管，上部是为峰距较短的波纹管，使用波纹管延长热传导距离。外筒，内筒，液氮筒侧壁均采用波纹管，波纹峰距相对液氦杜瓦侧壁使用的波纹管较长，由于外筒和内筒之间，内筒和液氮筒，液氮筒和液氦筒之间是真空层，受压差作用会有径向压力，波纹管可以提供抗压刚度。Further, the side walls of the liquid helium Dewar are welded with two-end tubes, the lower part is an ordinary round tube, and the upper part is a bellows with a short peak distance, and the bellows is used to extend the heat conduction distance. The outer cylinder, the inner cylinder and the side walls of the liquid nitrogen cylinder are all bellows. There is a vacuum layer between the nitrogen cylinder and the liquid helium cylinder, and there will be radial pressure due to the pressure difference, and the bellows can provide compressive stiffness.

附图说明Description of drawings

为了更清楚的说明本发明具体实施方式，下面对具体实施方式描述中所需要使用的附图作简单的介绍，应该了解的，下面描述中的附图是本发明的一些实施方式，在不脱离本发明精神和范围的前提下，还可以有各种变化。In order to illustrate the specific embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the specific embodiments. It should be understood that the accompanying drawings in the following description are some embodiments of the present invention. Various changes may be made without departing from the spirit and scope of the present invention.

图1为本发明的大口径低挥发损耗液氦杜瓦装置的剖面结构示意图：1-上外筒、2-下外筒、3-内筒、4-液氦筒、5-实验杆、6-铝辐射板、7-碳过滤网、8-MLI夹层、9-真空泵、10-连接不锈钢丝、11-耳片、12-外筒法兰、13-谐振阻尼杆、14-馈线管、15-室温线缆接口、16-安全阀Fig. 1 is the sectional structure schematic diagram of the large-diameter low-volatility loss liquid helium Dewar device of the present invention: 1-upper outer cylinder, 2-lower outer cylinder, 3-inner cylinder, 4-liquid helium cylinder, 5-experimental rod, 6-experimental rod -Aluminum radiant plate, 7-carbon filter, 8-MLI interlayer, 9-vacuum pump, 10-connecting stainless steel wire, 11-lug, 12-outer cylinder flange, 13-resonance damping rod, 14-feeder tube, 15- - Room temperature cable interface, 16- safety valve

具体实施方式Detailed ways

下面描述为了便于本领域普通技术人员更好理解和实现本发明。以下实例仅作为举例，不应理解为本发明局限于这里描述的示例性实例。The following description is for the convenience of those of ordinary skill in the art to better understand and implement the present invention. The following examples are by way of example only and should not be construed as limiting the invention to the illustrative examples described herein.

实施例一：Example 1:

如图1所示，本发明提供了一种满足实验操作的大口径低挥发损耗的液氦杜瓦装置。该杜瓦分为3层结构，分别是外筒(1和2)，内筒3，液氦杜瓦4。该三层结构均采用波纹管设计。As shown in FIG. 1 , the present invention provides a large-diameter and low-volatility-loss liquid helium Dewar device that satisfies the experimental operation. The Dewar is divided into 3-layer structures, namely outer cylinders (1 and 2), inner cylinder 3, and liquid helium Dewar 4. The three-layer structure adopts a corrugated tube design.

液氦杜瓦4中储存液氦，用于浸泡实验杆5，实验杆5上盖是一法兰盘，和液氦杜瓦4顶盖螺栓连接，并通过O型圈密封。Liquid helium is stored in the liquid helium Dewar 4 for soaking the test rod 5. The upper cover of the test rod 5 is a flange, which is bolted to the top cover of the liquid helium Dewar 4 and sealed by an O-ring.

外筒由上外筒1和下外筒2组成，两部分焊接有外筒法兰12，外筒法兰12通过螺栓连接，并通过O型圈进行密封，外筒波纹管侧壁焊接有谐振阻尼杆13，增加波纹管的稳定性。The outer cylinder is composed of an upper outer cylinder 1 and a lower outer cylinder 2. The outer cylinder flange 12 is welded to the two parts. The outer cylinder flange 12 is connected by bolts and sealed by an O-ring. The side wall of the outer cylinder bellows is welded with resonance. The damping rod 13 increases the stability of the bellows.

三层杜瓦结构，外筒1和2，内筒3，液氦杜瓦4同轴心安装。上外筒1的波纹管内壁上沿周向焊接3只耳片11，内筒3的波纹管外壁上相应位置也焊接三只耳片11，内筒3通过不锈钢丝10悬吊在上外筒1上。内筒3和液氦杜瓦4通过内筒顶盖法兰焊接连接。Three-layer Dewar structure, outer cylinders 1 and 2, inner cylinder 3, and liquid helium Dewar 4 are installed concentrically. Three lugs 11 are welded on the inner wall of the bellows of the upper outer cylinder 1 along the circumferential direction, and three lugs 11 are also welded at the corresponding positions on the outer wall of the bellows of the inner cylinder 3. The inner cylinder 3 is suspended from the upper outer cylinder through stainless steel wires 10. 1 on. The inner cylinder 3 and the liquid helium Dewar 4 are connected by welding through the inner cylinder top cover flange.

液氦杜瓦4上部安装安全阀16，下外筒2上波纹管侧壁焊接有两个KF40的真空泵接口9，内筒3侧壁开一个40mm的孔，内筒3底部焊接铝辐射板6，铝辐射板6中心开口，焊接有碳过滤层7。通过从杜瓦外部使用真空泵，使外筒1和2和内筒3之间，内筒3和液氦杜瓦4之间形成真空夹层。真空层中使用MLI夹层8填充。A safety valve 16 is installed on the upper part of the liquid helium Dewar 4, two KF40 vacuum pump ports 9 are welded on the bellows side wall of the lower outer cylinder 2, a 40mm hole is opened on the side wall of the inner cylinder 3, and an aluminum radiant plate 6 is welded at the bottom of the inner cylinder 3. , the center of the aluminum radiant plate 6 is open, and the carbon filter layer 7 is welded. By using a vacuum pump from outside the Dewar, a vacuum interlayer is formed between the outer cylinders 1 and 2 and the inner cylinder 3, and between the inner cylinder 3 and the liquid helium Dewar 4. The vacuum layer is filled with MLI interlayer 8.

实验杆6的上法兰顶盖上开孔，安装LEMO接口，通过O型圈密封；在上外筒1的顶盖上开孔焊接有异型KF40法兰15，安装LEMO接口，通过O型圈密封；实验杆上法兰接口和外筒上法兰接口之间通过馈线管14连接，馈线管14是螺旋结构，该馈线管内部有线缆，用于实验器件的室温段和低温段电路连通。实验杆6顶盖的LEMO接口处焊接有低温段线缆通道，在液氦筒4内部向下延伸至液氦浸泡中的实验器件，构成低温段线缆通路。The top cover of the upper flange of the test rod 6 has a hole, and the LEMO interface is installed, which is sealed by an O-ring; the top cover of the upper outer cylinder 1 is welded with a special-shaped KF40 flange 15, and the LEMO interface is installed, which is sealed by the O-ring. Sealing; the upper flange interface of the experimental rod and the upper flange interface of the outer cylinder are connected by a feeder tube 14, the feeder tube 14 is a spiral structure, and the feeder tube has a cable inside, which is used for the circuit connection between the room temperature section and the low temperature section of the experimental device . A low-temperature section cable channel is welded at the LEMO interface of the top cover of the experimental rod 6, and extends downward from the inside of the liquid helium cylinder 4 to the experimental device soaked in liquid helium to form a low-temperature section cable channel.

Claims (6)

1. A liquid helium Dewar device with large caliber and low volatilization loss satisfies experimental operation. The device comprises an outer cylinder, an inner cylinder suspended in the outer cylinder, a liquid helium cylinder nested in the inner cylinder, and an extension rod connected with experimental equipment. The method is characterized in that: the liquid helium cylinder is externally provided with an outer cylinder and an inner cylinder, and the inner cylinder and the outer cylinder are suspended and fixed through a thin stainless steel wire; a spiral corrugated pipe is used as a feed line pipe between the outer cylinder and the liquid helium cylinder; the welding flanges of the inner cylinder and the liquid helium cylinder are connected by a thick flange; the side walls of the outer cylinder, the inner cylinder and the liquid helium cylinder are all designed by corrugated pipes.
2. The liquid helium dewar apparatus satisfying experimental operation of claim 1, wherein: the outer barrel is of a split structure, the top cover and the bottom cover are welded plane plugs, the sealing surface is a welded sealing flange, and three pairs of lugs are welded on the inner side of the side wall of the upper corrugated pipe and are connected with the three pairs of lugs on the outer side of the side wall of the inner barrel through thin stainless steel wires.
3. The liquid helium dewar apparatus satisfying experimental operation of claim 1, wherein: the side wall of the liquid helium Dewar is welded by two end pipes, the lower part is a common circular pipe, and the upper part is a corrugated pipe with shorter peak distance. The outer cylinder, the inner cylinder and the side wall of the liquid nitrogen cylinder are corrugated pipes, and the corrugated peak distance is longer than that of the corrugated pipe used on the side wall of the liquid helium Dewar.
4. The liquid helium dewar apparatus satisfying experimental operation of claim 1, wherein: the vacuum layers of the liquid nitrogen cylinder and the liquid helium cylinder are filled by a multi-layer heat insulation Material (MLI) interlayer.
5. The liquid helium dewar apparatus satisfying experimental operation of claim 3, wherein: the low-temperature liquid in the liquid helium cylinder can be any one of liquid helium, liquid oxygen and liquid argon.
6. The liquid helium dewar apparatus satisfying experimental operation of claim 3, wherein: the welding flanges of the inner cylinder and the liquid helium cylinder are connected by a thick flange.
CN201910216140.5A 2019-03-21 2019-03-21 A Large Diameter Low Volatile Loss Dewar Pending CN111720726A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112815226A (en) * 2021-02-05 2021-05-18 氢合科技(广州)有限公司 High-vacuum maintained liquid helium dewar
CN114198633A (en) * 2021-12-14 2022-03-18 江阴市富仁高科股份有限公司 Vacuum heat-insulation deep-cooling hydrogen storage pressure vessel and manufacturing process thereof
WO2022161155A1 (en) * 2021-01-29 2022-08-04 上海兴邺材料科技有限公司 Tank

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022161155A1 (en) * 2021-01-29 2022-08-04 上海兴邺材料科技有限公司 Tank
CN112815226A (en) * 2021-02-05 2021-05-18 氢合科技(广州)有限公司 High-vacuum maintained liquid helium dewar
CN114198633A (en) * 2021-12-14 2022-03-18 江阴市富仁高科股份有限公司 Vacuum heat-insulation deep-cooling hydrogen storage pressure vessel and manufacturing process thereof

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Application publication date: 20200929