阅读说明：本技术 一种液氦杜瓦 (Liquid helium dewar ) 是由 汤忠喜 于 2020-12-29 设计创作，主要内容包括：本发明涉及一种液氦杜瓦,包括真空罩、液氮腔、液氮冷屏、液氦腔、真空层、吊杆和防辐射屏；液氦腔设于真空罩中,液氦腔的顶部开口处密封固定在真空罩的内部顶部,液氦腔与真空罩之间形成了真空层；液氮腔同心环绕在液氦腔外并设于真空罩中,液氮冷屏套设在液氦腔外部并处于真空层内,液氮冷屏的顶部开口处固定在液氮腔的底部并与液氮腔形成热传导连接,液氮冷屏的内壁与液氦腔的外壁间隔一定距离；本发明借助液氮腔和液氮冷屏实现了对液氦腔的保温,进而能长时间的维持低温环境以有效减少液氦的挥发,从而大幅延长了液氦的可储存时间,而且借助多个防辐射屏大幅减少了液氦的辐射漏热,即使在振动要求极高的实验中途也能补充液氦,进而能用于一些持续时间较长的实验以扩大了适用范围。(The invention relates to a liquid helium dewar, which comprises a vacuum cover, a liquid nitrogen cavity, a liquid nitrogen cold screen, a liquid helium cavity, a vacuum layer, a suspender and a radiation-proof screen; the liquid helium cavity is arranged in the vacuum cover, an opening at the top of the liquid helium cavity is hermetically fixed at the top of the interior of the vacuum cover, and a vacuum layer is formed between the liquid helium cavity and the vacuum cover; the liquid nitrogen cavity is concentrically wound outside the liquid helium cavity and is arranged in the vacuum cover, the liquid nitrogen cold screen is sleeved outside the liquid helium cavity and is positioned in the vacuum layer, the opening at the top of the liquid nitrogen cold screen is fixed at the bottom of the liquid nitrogen cavity and is in heat conduction connection with the liquid nitrogen cavity, and the inner wall of the liquid nitrogen cold screen is spaced from the outer wall of the liquid helium cavity by a certain distance; the liquid helium storage device has the advantages that the liquid helium cavity is insulated by virtue of the liquid nitrogen cavity and the liquid nitrogen cold screen, so that the low-temperature environment can be maintained for a long time to effectively reduce the volatilization of the liquid helium, the storage time of the liquid helium is greatly prolonged, the radiation heat leakage of the liquid helium is greatly reduced by virtue of the plurality of radiation-proof screens, the liquid helium can be supplemented even in the middle of an experiment with extremely high vibration requirement, and further, the liquid helium storage device can be used for experiments with long duration to expand the application range.)

1. A liquid helium Dewar is characterized by comprising a vacuum cover, a liquid nitrogen cavity, a liquid nitrogen cold screen, a liquid helium cavity, a vacuum layer, a suspender and a radiation-proof screen; the liquid helium cavity is arranged in the vacuum cover, an opening at the top of the liquid helium cavity is hermetically fixed at the top of the interior of the vacuum cover, and a vacuum layer is formed between the liquid helium cavity and the vacuum cover; the liquid nitrogen cavity is concentrically wound outside the liquid helium cavity and is arranged in the vacuum cover, the hanging rods comprise a plurality of hanging rods, the hanging rods are fixed between the top of the liquid nitrogen cavity and the top of the inside of the vacuum cover at equal angles along the circumferential direction, the liquid nitrogen cold screen is sleeved outside the liquid helium cavity and is positioned in the vacuum layer, an opening at the top of the liquid nitrogen cold screen is fixed at the bottom of the liquid nitrogen cavity and is in heat conduction connection with the liquid nitrogen cavity, and a certain distance is reserved between the inner wall of the liquid nitrogen cold screen and the outer wall of the liquid helium cavity; the radiation protection screen includes a plurality ofly, it is a plurality of the radiation protection screen all cup joints on the outer wall in liquid helium chamber and along vertical direction equidistant distribution.

2. The liquid helium dewar according to claim 1, wherein the number of the radiation protection screens is 3-10.

3. The liquid helium dewar of claim 1, wherein the outer walls of the liquid nitrogen cavity, the liquid nitrogen cold shield and the liquid helium cavity are coated with adsorption layers.

Technical Field

The invention relates to a liquid helium dewar.

Background

Some scientific experiments need to be carried out in a liquid helium environment, wherein soaking a sample in liquid helium is a common method for obtaining a low-temperature environment, a liquid helium dewar is a low-temperature container for containing liquid helium, and existing liquid helium dewars are all insulated by adopting a steam-cooled multilayer cold shield and combining a vacuum heat-insulating material.

Disclosure of Invention

In view of the above-mentioned current situation of the prior art, the present invention provides a liquid helium dewar capable of maintaining a low temperature environment for a long time to effectively reduce volatilization of liquid helium, thereby greatly prolonging the storage time of liquid helium, and greatly reducing radiation heat leakage of liquid helium to expand the application range.

The technical scheme adopted by the invention for solving the technical problems is as follows: a liquid helium Dewar is characterized by comprising a vacuum cover, a liquid nitrogen cavity, a liquid nitrogen cold screen, a liquid helium cavity, a vacuum layer, a suspender and a radiation-proof screen; the liquid helium cavity is arranged in the vacuum cover, an opening at the top of the liquid helium cavity is hermetically fixed at the top of the interior of the vacuum cover, and a vacuum layer is formed between the liquid helium cavity and the vacuum cover; the liquid nitrogen cavity is concentrically wound outside the liquid helium cavity and is arranged in the vacuum cover, the hanging rods comprise a plurality of hanging rods, the hanging rods are fixed between the top of the liquid nitrogen cavity and the top of the inside of the vacuum cover at equal angles along the circumferential direction, the liquid nitrogen cold screen is sleeved outside the liquid helium cavity and is positioned in the vacuum layer, an opening at the top of the liquid nitrogen cold screen is fixed at the bottom of the liquid nitrogen cavity and is in heat conduction connection with the liquid nitrogen cavity, and a certain distance is reserved between the inner wall of the liquid nitrogen cold screen and the outer wall of the liquid helium cavity; the radiation protection screen includes a plurality ofly, it is a plurality of the radiation protection screen all cup joints on the outer wall in liquid helium chamber and along vertical direction equidistant distribution.

Preferably, the number of the radiation protection screens is 3-10.

Preferably, the outer walls of the liquid nitrogen cavity, the liquid nitrogen cold screen and the liquid helium cavity are coated with adsorption layers.

Compared with the prior art, the invention has the advantages that: the liquid helium storage device has the advantages that the liquid helium cavity is insulated by virtue of the liquid nitrogen cavity and the liquid nitrogen cold screen, so that the low-temperature environment can be maintained for a long time to effectively reduce the volatilization of the liquid helium, the storage time of the liquid helium is greatly prolonged, the radiation heat leakage of the liquid helium is greatly reduced by virtue of the plurality of radiation-proof screens, the liquid helium can be supplemented even in the middle of an experiment with extremely high vibration requirement, and further, the liquid helium storage device can be used for experiments with long duration to expand the application range.

Drawings

FIG. 1 is a sectional view showing the structure of the present invention.

Detailed Description

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

To maintain the following description of the embodiments of the present invention clear and concise, a detailed description of known functions and known components of the invention have been omitted.

As shown in fig. 1, a liquid helium dewar comprises a vacuum cover 1, a liquid nitrogen cavity 2, a liquid nitrogen cold screen 3, a liquid helium cavity 4, a vacuum layer 5, a hanger rod 6 and a radiation-proof screen 7; the liquid helium cavity 4 is arranged in the vacuum cover 1, the opening at the top of the liquid helium cavity 4 is hermetically fixed at the top of the interior of the vacuum cover 1, and a vacuum layer 5 is formed between the liquid helium cavity 4 and the vacuum cover 1; the liquid nitrogen chamber 2 concentric ring is around outside the liquid helium chamber 4 and locate in vacuum hood 1, jib 6 includes a plurality ofly, a plurality of jibs 6 along the inside top of fixing of the equal angle of circumferencial direction at liquid nitrogen chamber 2 and vacuum hood 1, 3 covers of liquid nitrogen cold screen are established outside and in vacuum layer 5 in the liquid helium chamber 4, the open-top department of liquid nitrogen cold screen 3 fixes in the bottom of liquid nitrogen chamber 2 and is connected with the heat conduction of liquid nitrogen chamber 2, the inner wall of liquid nitrogen cold screen 3 and the outer wall interval of liquid helium chamber 4 keep a certain distance apart.

The radiation protection screens 7 comprise a plurality of radiation protection screens 7 which are all sleeved on the outer wall of the liquid helium cavity 4 and are distributed at equal intervals along the vertical direction.

The number of the radiation protection screens 7 is 3-10.

And the outer walls of the liquid nitrogen cavity 2, the liquid nitrogen cold screen 3 and the liquid helium cavity 4 are all coated with an adsorption layer 8.

The working principle is as follows: under the normal working state, the vacuum degree in the vacuum layer 5 is between 10 & lt-6 & gt Pa and 10 & lt-3 & gt Pa; liquid nitrogen is filled in the liquid nitrogen cavity 2, the coldness of the liquid nitrogen cavity 2 is transmitted to the liquid nitrogen cold screen 3, and the liquid nitrogen cold screen 3 can ensure that the low-temperature of the liquid nitrogen cold screen can be maintained as long as liquid nitrogen is in the liquid nitrogen cavity 2, so that the radiation heat leakage of the liquid nitrogen cold screen 3 to the liquid helium cavity is reduced; in the process that the cold helium gas evaporated in the liquid helium cavity 4 is discharged out of the liquid helium cavity 4, the cold helium gas sequentially passes through the plurality of radiation-proof screens 7, and the plurality of radiation-proof screens 7 form a temperature gradient along the arrangement direction, so that the radiation heat leakage in the area from the opening at the top of the liquid helium cavity 4 to the surface of the liquid helium can be reduced to a great extent; the adsorption layer 8 is made of an adsorption material, and can effectively maintain the static vacuum of the vacuum layer 5.

The liquid helium storage device realizes heat preservation of the liquid helium cavity 4 by virtue of the liquid nitrogen cavity 2 and the liquid nitrogen cold screen 3, further can maintain a low-temperature environment for a long time to effectively reduce volatilization of liquid helium, thereby greatly prolonging the storage time of the liquid helium, and greatly reduces radiation heat leakage of the liquid helium by virtue of the plurality of radiation-proof screens 7, so that the liquid helium can be supplemented even in the middle of an experiment with extremely high vibration requirement, and further can be used for experiments with long duration to expand the application range.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that various changes in the embodiments and modifications thereof may be made, and equivalents may be substituted for elements thereof; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions of the embodiments of the present invention.