CN218348407U

CN218348407U - Liquid helium dewar

Info

Publication number: CN218348407U
Application number: CN202222805140.9U
Authority: CN
Inventors: 梁丽丽
Original assignee: Sinoscience Fullcryo Zhongshan Low Temperature Equipment Manufacturing Co Ltd
Current assignee: Sinoscience Fullcryo Zhongshan Low Temperature Equipment Manufacturing Co Ltd
Priority date: 2022-10-24
Filing date: 2022-10-24
Publication date: 2023-01-20
Anticipated expiration: 2032-10-24

Abstract

The utility model provides a liquid helium dewar relates to liquid helium dewar technical field. The liquid helium dewar comprises an outer shell, an inner container, a neck tube, a reflection assembly and a heat insulation assembly. The inner container is arranged in the shell, the reflection assembly comprises a first reflection piece and a second reflection piece, and the first reflection piece and the second reflection piece are sleeved on the neck pipe at intervals along the axial direction of the neck pipe; adiabatic subassembly includes first adiabatic layer group, the adiabatic layer group of second and the adiabatic layer group of third, on the fixed inner bag of one end of first adiabatic layer group and the vertical spiral winding of first adiabatic layer group on the inner bag, on the fixed first adiabatic layer group of one end of the adiabatic layer group of second and the vertical spiral winding of the adiabatic layer group of second on first adiabatic layer group and first reflection piece, on the fixed adiabatic layer group of second of one end of the adiabatic layer group of third and the vertical spiral winding of the adiabatic layer group of third on adiabatic layer group of second and second reflection piece. The utility model provides a liquid helium dewar has effectively promoted the adiabatic performance.

Description

Liquid helium dewar

Technical Field

The utility model relates to a liquid helium dewar technical field especially relates to a liquid helium dewar.

Background

In the fields of low-temperature liquid storage, low-temperature research and superconduction, a Dewar flask occupies a very important position, is also called a thermos flask, and can well maintain a low-temperature environment, so that the energy consumption of refrigeration equipment is reduced.

The liquid helium dewar is a container for containing a 4.5K liquid helium medium, the liquid helium dewar is an inner-outer interlayer container structure, the middle part is a high vacuum interlayer, and the inner container is wrapped with a heat insulating material. In the prior art, a plurality of areas are mostly arranged along the vertical direction according to the appearance of the liquid helium dewar liner, the plurality of areas are sequentially sleeved with corresponding heat insulating layers, commonly called as 'quilt covering', and the mode ensures that the conduction between the heat insulating layers corresponding to the plurality of areas is disconnected, thereby reducing the heat insulating performance.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at overcoming not enough among the prior art, this application provides a liquid helium dewar to solve among the prior art mostly to set up a plurality of regions according to the appearance of liquid helium dewar inner bag along vertical direction, a plurality of regions overlap in proper order and establish corresponding heat insulation layer, make the conduction disconnection between the heat insulation layer that a plurality of regions correspond, lead to it to reduce the technical problem of adiabatic performance.

The utility model provides a following technical scheme:

a liquid helium dewar comprising:

the top of the shell is provided with a first through hole;

the inner container is arranged in the shell and used for storing liquid helium, and a second through hole corresponding to the first through hole is formed in the top of the inner container;

the neck pipe is respectively arranged in the second through hole and the first through hole in a penetrating mode;

the reflecting assembly comprises a first reflecting piece and a second reflecting piece, and the first reflecting piece and the second reflecting piece are sleeved on the neck pipe at intervals along the axial direction of the neck pipe;

adiabatic subassembly, adiabatic subassembly includes first adiabatic layer group, the adiabatic layer group of second and the adiabatic layer group of third, the one end of first adiabatic layer group is fixed on the inner bag just the vertical spiral winding of first adiabatic layer group in on the inner bag, the one end of the adiabatic layer group of second is fixed on the first adiabatic layer group just the vertical spiral winding of the adiabatic layer group of second in first adiabatic layer group with on the first reflection part, the one end of the adiabatic layer group of third is fixed on the adiabatic layer group of second just the vertical spiral winding of the adiabatic layer group of third in the adiabatic layer group of second with on the second reflection part.

In some embodiments of the present application, the first thermal insulation layer group includes a first thermal insulation layer and a second thermal insulation layer, one end of the first thermal insulation layer is fixed on the liner, and the first thermal insulation layer is longitudinally and spirally wound on the liner, one end of the second thermal insulation layer is fixed on the first thermal insulation layer, and the second thermal insulation layer is longitudinally and spirally wound on the first thermal insulation layer.

In some embodiments of the present application, the liquid helium dewar further comprises a first cladding layer located between the first thermal insulation layer and the second thermal insulation layer.

In some embodiments of the present application, the second thermal insulation layer is provided with a plurality of layers sequentially spirally wound longitudinally on the first thermal insulation layer.

In some embodiments of the present application, the second insulation layer group includes a third insulation layer and a fourth insulation layer, the one end of the third insulation layer is fixed on the first insulation layer group and the third insulation layer is longitudinally spirally wound on the first insulation layer group and the first reflector, the one end of the fourth insulation layer is fixed on the third insulation layer and the fourth insulation layer is longitudinally spirally wound on the third insulation layer.

In some embodiments of the present application, the liquid helium dewar further comprises a second cladding layer between the third and fourth thermal insulation layers.

In some embodiments of this application, the third heat insulation layer with the fourth heat insulation layer all is provided with the multilayer, and the multilayer the third heat insulation layer in proper order vertical spiral winding in first heat insulation layer group with on the first reflection piece, the multilayer the fourth heat insulation layer in proper order vertical spiral winding in on the third heat insulation layer.

In some embodiments of the present application, the third thermal insulation layer group includes a fifth thermal insulation layer and a sixth thermal insulation layer, the one end of the fifth thermal insulation layer is fixed on the second thermal insulation layer group and the fifth thermal insulation layer is longitudinally spirally wound on the second thermal insulation layer group and the second reflector, the one end of the sixth thermal insulation layer is fixed on the fifth thermal insulation layer and the sixth thermal insulation layer is longitudinally spirally wound on the fifth thermal insulation layer.

In some embodiments of the present application, the liquid helium dewar further comprises a third cladding layer between the fifth thermal insulation layer and the sixth thermal insulation layer.

In some embodiments of the present application, the fifth heat insulating layer and the sixth heat insulating layer are both provided with a plurality of layers, the fifth heat insulating layer is sequentially and longitudinally spirally wound on the second heat insulating layer group and the second reflector, and the sixth heat insulating layer is sequentially and longitudinally spirally wound on the fifth heat insulating layer.

The embodiment of the utility model has the following advantage:

the application provides a liquid helium dewar fixes on the inner bag and with the vertical spiral winding of first thermal insulation layer group on the inner bag through the one end with first thermal insulation layer group to cover the inner bag, reduce inner bag and external heat exchange, promote the thermal insulation performance. One end of the second heat insulation layer group is fixed on the first heat insulation layer group, and the second heat insulation layer group is longitudinally spirally wound on the first heat insulation layer group and the first reflecting piece to cover the first heat insulation layer group and the first reflecting piece, so that heat exchange between the inner container and the outside is further reduced, and the heat insulation performance is further improved. One end of the third heat insulation layer group is fixed on the second heat insulation layer group, and the third heat insulation layer group is longitudinally spirally wound on the second heat insulation layer group and the second reflecting piece to cover the second heat insulation layer group and the second reflecting piece, so that the heat exchange between the inner container and the outside is further reduced, and the heat insulation performance is further improved. Through setting up first adiabatic layer group, second adiabatic layer group and third adiabatic layer group vertical spiral winding in proper order, make first adiabatic layer group, second adiabatic layer group and third adiabatic layer group be continuous connection and uninterrupted like this to fully conduct in the cold volume of liquid helium returns the inner bag, effectively promoted adiabatic performance. The technical problem of most among the prior art according to the appearance of liquid helium dewar inner bag along vertical direction setting up a plurality of regions, corresponding heat insulation layer is established to a plurality of regions cover in proper order for conduction between the heat insulation layer that a plurality of regions correspond breaks off, leads to it to reduce adiabatic performance has been improved.

In order to make the aforementioned and other objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 illustrates a perspective, perspective view of a liquid helium Dewar according to some embodiments of the present application;

FIG. 2 illustrates another perspective, schematic view of a liquid helium Dewar according to some embodiments of the present application;

FIG. 3 illustrates a schematic cross-sectional view from a perspective of a liquid helium Dewar according to some embodiments of the present application;

FIG. 4 illustrates another perspective cross-sectional view of a liquid helium Dewar according to some embodiments of the present application.

Description of the main element symbols:

100-liquid helium dewar; 110-an inner container; 111-a second via; 120-neck tube; 130-a reflective component; 131-a first reflector; 132-a second reflector; 140-an insulation assembly; 141-a first insulation layer group; 1411-first thermal insulation layer; 1412 — a second thermal insulation layer; 142-a second insulation layer set; 1421 — third insulation layer; 1422-fourth insulation layer; 143-a third insulation layer group; 1431-fifth insulating layer; 1432-sixth insulating layer.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the templates is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that the liquid helium dewar is a container for containing a liquid helium medium with a temperature of 4.5K, and a helium simple substance is changed from gaseous helium to liquid helium at an extremely low temperature, and the gaseous helium is an expensive rare gas. Liquid helium is an ultra-low temperature medium, and relatively small heat flows are accumulated to generate serious evaporation loss. There are three ways of heat transfer, namely heat conduction, heat convection and heat radiation, and since the liquid helium dewar is sandwiched in a high vacuum (0.001 Pa) environment, the heat conduction and heat convection are extremely small, so that the vacuum insulation is mainly considered to reduce the radiation heat transfer.

According to the low-temperature heat transfer distribution rule, the radiation heat transfer is dominant at the position of the heat insulation layer close to the thermal boundary. Whereas solid thermal conduction dominates in the insulator layer near the cold boundary. Therefore, the heat conduction of the solid can be reduced by arranging less heat insulation layers at the cold boundary, and the radiation heat transfer can be reduced by arranging more heat insulation layers at the hot boundary, so that the total heat flow is effectively reduced, and the heat insulation performance is improved.

As shown in fig. 1-3, embodiments of the present application provide a liquid helium dewar 100 primarily for storing liquid helium. The liquid helium dewar 100 includes a housing, an inner vessel 110, a neck tube 120, a reflective assembly 130 and a thermal insulation assembly 140.

Wherein, the top of shell is seted up first through-hole. The inner container 110 is disposed in the outer shell and used for storing liquid helium, and a second through hole 111 corresponding to the first through hole is formed at the top of the inner container 110. The neck 120 is respectively inserted into the second through hole 111 and the first through hole. The reflection assembly 130 includes a first reflection member 131 and a second reflection member 132, and the first reflection member 131 and the second reflection member 132 are sleeved on the neck tube 120 at intervals along the axial direction of the neck tube 120.

Referring to fig. 4, the heat insulation assembly 140 includes a first heat insulation layer group 141, a second heat insulation layer group 142, and a third heat insulation layer group 143, one end of the first heat insulation layer group 141 is fixed to the inner container 110, the first heat insulation layer group 141 is longitudinally and spirally wound on the inner container 110, one end of the second heat insulation layer group 142 is fixed to the first heat insulation layer group 141, the second heat insulation layer group 142 is longitudinally and spirally wound on the first heat insulation layer group 141 and the first reflective member 131, one end of the third heat insulation layer group 143 is fixed to the second heat insulation layer group 142, and the third heat insulation layer group 143 is longitudinally and spirally wound on the second heat insulation layer group 142 and the second reflective member 132.

According to the liquid helium dewar 100 provided by the embodiment of the application, the first through hole is formed in the top of the outer shell, the inner container 110 for storing liquid helium is arranged in the outer shell, and the second through hole 111 corresponding to the first through hole is formed in the top of the inner container 110, so that the neck tube 120 can sequentially penetrate through the second through hole 111 and the first through hole to be communicated with the inner container 110, and liquid helium can be added into the inner container 110 or taken out of the inner container 110. The junction of the neck 120 and the first through hole may be provided with a sealing connector and a reinforcement, and the junction of the neck 120 and the second through hole 111 may also be provided with a sealing connector and a reinforcement, so as to achieve sealing connection and stable connection.

Through setting up first reflection part 131 and second reflection part 132 along the axial looks interval cover of neck 120 locate the neck 120 on, first reflection part 131 and second reflection part 132 all can be for radiating the copper screen, and radiation copper screen surface is bright for utilize the reflection principle with external heat to reflect back to external world, effectively reduce neck 120 and external heat exchange, reduced radiation heat transfer, thereby effectively promoted thermal-insulated performance.

Specifically, one end of the first thermal insulation layer group 141 is fixed on the inner container 110, and the first thermal insulation layer group 141 is longitudinally and spirally wound on the inner container 110 to cover the inner container 110, so that heat exchange between the inner container 110 and the outside is reduced, and thermal insulation performance is improved.

One end of the second insulation layer group 142 is fixed to the first insulation layer group 141, and the second insulation layer group 142 is longitudinally and spirally wound on the first insulation layer group 141 and the first reflection member 131 to cover the first insulation layer group 141 and the first reflection member 131, so that heat exchange between the inner container 110 and the outside is further reduced, and the insulation performance is further improved.

One end of the third insulation layer group 143 is fixed on the second insulation layer group 142, and the third insulation layer group 143 is longitudinally and spirally wound on the second insulation layer group 142 and the second reflection member 132 to cover the second insulation layer group 142 and the second reflection member 132, so that heat exchange between the inner container 110 and the outside is further reduced, and the insulation performance is further improved.

Through setting up first adiabatic layer group 141, second adiabatic layer group 142 and third adiabatic layer group 143 longitudinal spiral winding in proper order, make first adiabatic layer group 141, second adiabatic layer group 142 and third adiabatic layer group 143 be continuous connection and uninterrupted like this to in the cold volume of fully conducting liquid helium returns inner bag 110, reduced the radiation heat transfer, effectively promoted thermal insulation performance. The technical problems that in the prior art, a plurality of areas are mostly arranged along the vertical direction according to the appearance of the liquid helium dewar liner, and the corresponding heat insulation layers are sequentially sleeved in the areas, so that the heat insulation layers corresponding to the areas are disconnected in conduction, and the heat insulation performance is reduced are solved.

Illustratively, the first insulation group, the second insulation group and the third insulation group may be composed of an aluminum foil layer and a composite layer, the cold quantity of the liquid helium is fully conducted by using the insulation performance of the aluminum foil layer and returns to the inner container 110, so that the temperature gradient is reduced, the insulation performance is effectively improved, and the composite layer may be formed by integrally forming a double-sided aluminum-plated film and an insulation paper, so as to improve the insulation performance. The heat insulation assembly 140 can completely cover the liner 110 by adopting a longitudinal spiral winding manner, the spiral direction can be left-handed or right-handed, and the lap value can be between 20mm and 40mm.

As shown in fig. 3 and 4, in an embodiment of the present application, optionally, the first thermal insulation layer group 141 includes a first thermal insulation layer 1411 and a second thermal insulation layer 1412, one end of the first thermal insulation layer 1411 is fixed on the liner 110, the first thermal insulation layer 1411 is longitudinally and spirally wound on the liner 110, one end of the second thermal insulation layer 1412 is fixed on the first thermal insulation layer 1411, and the second thermal insulation layer 1412 is longitudinally and spirally wound on the first thermal insulation layer 1411.

In the embodiment, one end of the first thermal insulation layer 1411 is fixed on the inner container 110, and the first thermal insulation layer 1411 is longitudinally and spirally wound on the inner container 110 to cover the inner container 110, so that heat exchange between the inner container 110 and the outside is reduced, and the thermal insulation performance is improved. By fixing one end of the second thermal insulation layer 1412 to the first thermal insulation layer 1411 and spirally winding the second thermal insulation layer 1412 on the first thermal insulation layer 1411 in a longitudinal direction to cover the first thermal insulation layer 1411, heat exchange between the inner bladder 110 and the outside is reduced, and thermal insulation performance is improved.

For example, the first thermal insulation layer 1411 may be a pure aluminum foil layer, and the cold energy of the liquid helium is fully conducted back into the inner container 110 by using the thermal insulation performance of the pure aluminum foil layer, so that the temperature gradient is reduced, and the thermal insulation performance is effectively improved. The second thermal insulation layer 1412 may be a composite layer formed by integrally molding a double-sided aluminum-plated film and a thermal insulation paper to improve thermal insulation performance. The first thermal insulation layer 1411 can completely cover the liner 110 by adopting a longitudinal spiral winding manner, the second thermal insulation layer 1412 can completely cover the first thermal insulation layer 1411, the spiral direction can be left-handed or right-handed, the lap joint value of the first thermal insulation layer 1411 can be 20mm, and the lap joint value of the second thermal insulation layer 1412 can be 40mm.

In the above-described embodiment of the present application, optionally, the liquid helium dewar 100 further comprises a first cladding layer (not shown) between the first thermal insulation layer 1411 and the second thermal insulation layer 1412.

In the present embodiment, by providing a first cladding between the first thermal insulation layer 1411 and the second thermal insulation layer 1412, the first cladding is used to tighten the first thermal insulation layer 1411. Specifically, after the first thermal insulation layer 1411 is longitudinally and spirally wound on the inner container 110 and completely covers the inner container 110, the first thermal insulation layer 1411 needs to be compressed to be tightly attached to the inner container 110. By arranging the first coating layer, the first heat insulation layer 1411 is tightly coated, so that the first heat insulation layer 1411 is tightly attached to the liner 110, the cold energy of the liquid helium is fully conducted and returned to the liner 110, and the heat insulation performance is improved.

For example, the material of the first coating layer may be nylon mesh.

As shown in fig. 3 and 4, in the above-described embodiment of the present application, optionally, the second thermal insulation layer 1412 is provided with a plurality of layers, and the plurality of layers of the second thermal insulation layer 1412 are sequentially spirally wound longitudinally on the first thermal insulation layer 1411.

In the embodiment, the number of the second heat insulation layers 1412 is set to be multiple, and the multiple second heat insulation layers 1412 are sequentially and longitudinally spirally wound on the first heat insulation layer 1411, so that the total thickness of the first heat insulation layer group 141 is increased, heat exchange between the liner 110 and the outside is reduced, and the heat insulation performance is effectively improved.

For example, the first thermal insulation layer 1411 may have one layer, and the second thermal insulation layer 1412 may have ten layers.

As shown in fig. 3 and 4, in an embodiment of the present application, optionally, the second insulation layer group 142 includes a third insulation layer 1421 and a fourth insulation layer 1422, one end of the third insulation layer 1421 is fixed on the first insulation layer group 141, and the third insulation layer 1421 is longitudinally spirally wound on the first insulation layer group 141 and the first reflector 131, one end of the fourth insulation layer 1422 is fixed on the third insulation layer 1421, and the fourth insulation layer 1422 is longitudinally spirally wound on the third insulation layer 1421.

In this embodiment, by fixing one end of the third heat insulating layer 1421 to the first heat insulating layer group 141 and spirally winding the third heat insulating layer 1421 on the first heat insulating layer group 141 and the first reflective member 131 in a longitudinal direction to cover the first heat insulating layer group 141 and the first reflective member 131, heat exchange of the inner container 110 with the outside is further reduced, and the heat insulating performance is further improved. By fixing one end of the fourth insulating layer 1422 to the third insulating layer 1421 and spirally winding the fourth insulating layer 1422 on the third insulating layer 1421 in a longitudinal direction to cover the third insulating layer 1421, heat exchange between the inner container 110 and the outside is further reduced, and the insulating performance is further improved.

For example, the third thermal insulation layer 1421 may be a pure aluminum foil layer, and the cold energy of the liquid helium is fully conducted back into the inner container 110 by using the thermal insulation property of the pure aluminum foil layer, so that the temperature gradient is reduced, and the thermal insulation property is effectively improved. The fourth thermal insulation layer 1422 may be a composite layer formed by integrally forming a double-sided aluminum-plated film and a thermal insulation paper to improve thermal insulation performance. The third thermal insulation layer 1421 can completely cover the first thermal insulation layer group 141 and the first reflector 131 by using the longitudinal spiral winding manner, the fourth thermal insulation layer 1422 can completely cover the third thermal insulation layer 1421, the spiral direction may be left-handed or right-handed, the lap value of the third thermal insulation layer 1421 may be 20mm, and the lap value of the fourth thermal insulation layer 1422 may be 40mm.

In the above-described embodiment of the present application, optionally, the liquid helium dewar 100 further comprises a second cladding layer (not shown) between the third thermal insulation layer 1421 and the fourth thermal insulation layer 1422.

In this embodiment, a second cladding layer is provided between the third insulation layer 1421 and the fourth insulation layer 1422 to tightly surround the third insulation layer 1421. Specifically, after the third thermal insulation layer 1421 is longitudinally spirally wound on the first thermal insulation layer group 141 and completely covers the first thermal insulation layer group 141 and the first reflective member 131, the third thermal insulation layer 1421 is compressed to be closely attached to the first thermal insulation layer group 141 and the first reflective member 131. By providing the second cladding layer to tightly wrap the first thermal insulation layer group 141 and the first reflection member 131, the third thermal insulation layer 1421 is tightly attached to the first thermal insulation layer group 141 and the first reflection member 131, so that the cold energy of the liquid helium is sufficiently conducted and returned to the inner container 110, and the thermal insulation performance is improved.

For example, the second coating layer may be made of nylon mesh.

As shown in fig. 3 and 4, in the above-mentioned embodiment of the present application, optionally, the third thermal insulation layer 1421 and the fourth thermal insulation layer 1422 are each provided with a plurality of layers, the plurality of layers of the third thermal insulation layer 1421 are sequentially longitudinally spirally wound on the first thermal insulation layer group 141 and the first reflector 131, and the plurality of layers of the fourth thermal insulation layer 1422 are sequentially longitudinally spirally wound on the third thermal insulation layer 1421.

In this embodiment, the third thermal insulation layer 1421 and the fourth thermal insulation layer 1422 are disposed in multiple layers, and the multiple third thermal insulation layers 1421 are sequentially and longitudinally spirally wound on the first thermal insulation layer group 141 and the first reflector 131, and the multiple fourth thermal insulation layers 1422 are sequentially and longitudinally spirally wound on the third thermal insulation layer 1421, so that the total thickness of the second thermal insulation layer group 142 is increased, heat exchange between the liner 110 and the outside is reduced, and the thermal insulation performance is effectively improved.

For example, the number of layers of the third insulating layer 1421 may be four, and the number of layers of the fourth insulating layer 1422 may be sixteen.

As shown in fig. 2, 3 and 4, in one embodiment of the present application, optionally, the third insulation layer group 143 includes a fifth insulation layer group 1431 and a sixth insulation layer 1432, one end of the fifth insulation layer 1431 is fixed to the second insulation layer group 142 and the fifth insulation layer 1431 is longitudinally and spirally wound on the second insulation layer group 142 and the second reflector 132, one end of the sixth insulation layer 1432 is fixed to the fifth insulation layer 1431 and the sixth insulation layer 1432 is longitudinally and spirally wound on the fifth insulation layer 1431.

In the embodiment, one end of the fifth thermal insulation layer 1431 is fixed on the second thermal insulation layer group 142, and the fifth thermal insulation layer 1431 is longitudinally and spirally wound on the second thermal insulation layer group 142 and the second reflection member 132 to cover the second thermal insulation layer group 142 and the second reflection member 132, so that heat exchange between the inner container 110 and the outside is further reduced, and the thermal insulation performance is further improved. By fixing one end of the sixth heat insulating layer 1432 to the fifth heat insulating layer 1431 and spirally winding the sixth heat insulating layer 1432 on the fifth heat insulating layer 1431 in a longitudinal direction to cover the fifth heat insulating layer 1431, heat exchange between the inner container 110 and the outside is further reduced, and heat insulating performance is further improved.

For example, the fifth thermal insulation layer 1431 may be a pure aluminum foil layer, and the cold energy of the liquid helium is fully conducted back to the inner container 110 by using the thermal insulation performance of the pure aluminum foil layer, so that the temperature gradient is reduced, and the thermal insulation performance is effectively improved. Sixth insulating layer 1432 may be a composite layer formed by integrally molding a double-sided aluminum-plated film and an insulating paper, so as to improve insulating performance. By using the longitudinal spiral winding manner, the fifth thermal insulation layer 1431 can completely cover the second thermal insulation layer group 142 and the second reflective member 132, the sixth thermal insulation layer 1432 can completely cover the fifth thermal insulation layer 1431, the spiral direction may be left-handed or right-handed, the overlap value of the fifth thermal insulation layer 1431 may be 20mm, and the overlap value of the sixth thermal insulation layer 1432 may be 40mm.

In the above-described embodiment of the present application, optionally, the liquid helium dewar 100 further comprises a third cladding layer (not shown) between the fifth thermal insulation layer 1431 and the sixth thermal insulation layer 1432.

In the present embodiment, by providing a third cladding layer between fifth insulating layer 1431 and sixth insulating layer 1432, the third cladding layer is used to tightly wrap fifth insulating layer 1431. Specifically, after the fifth thermal insulation layer 1431 is longitudinally and spirally wound on the second thermal insulation layer group 142 and completely covers the second thermal insulation layer group 142 and the second reflective member 132, the fifth thermal insulation layer 1431 needs to be tightly pressed to be tightly attached to the second thermal insulation layer group 142 and the second reflective member 132. Through setting up the third cladding layer to realize tightly packing second heat insulation layer group 142 and second reflection piece 132, make fifth heat insulation layer 1431 closely laminate on second heat insulation layer group 142 and second reflection piece 132, thereby fully conduct the cold volume of liquid helium and return to in inner bag 110, promoted adiabatic performance.

For example, the third coating layer may be made of nylon mesh.

As shown in fig. 2, 3 and 4, in the above-described embodiment of the present application, optionally, each of the fifth thermal insulation layer 1431 and the sixth thermal insulation layer 1432 is provided with a plurality of layers, and the fifth thermal insulation layer 1431 is sequentially longitudinally and spirally wound on the second thermal insulation layer group 142 and the second reflective member 132, and the sixth thermal insulation layer 1432 is sequentially longitudinally and spirally wound on the fifth thermal insulation layer 1431.

In this embodiment, the fifth heat insulation layer 1431 and the sixth heat insulation layer 1432 are respectively provided in multiple layers, the multiple fifth heat insulation layers 1431 are sequentially longitudinally and spirally wound on the second heat insulation layer group 142 and the second reflection member 132, and the multiple sixth heat insulation layers 1432 are sequentially longitudinally and spirally wound on the fifth heat insulation layers 1431, so that the total thickness of the third heat insulation layer group 143 is increased, heat exchange between the inner container 110 and the outside is reduced, and the heat insulation performance is effectively improved.

Illustratively, the number of fifth insulating layer 1431 layers may be four, the number of sixth insulating layer 1432 layers may be twenty-five, the total number of insulating assemblies 140 may be sixty layers, and the total thickness may be 30mm, which may effectively reduce the total heat flow and improve the insulating performance.

In all examples shown and described herein, any particular value should be construed as merely exemplary, and not as a limitation, and thus other examples of example embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

The above-mentioned embodiments only represent several embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which all fall within the scope of the present invention.

Claims

1. A liquid helium dewar comprising:

the top of the shell is provided with a first through hole;

2. The liquid helium dewar of claim 1, wherein the first thermal insulation layer group comprises a first thermal insulation layer and a second thermal insulation layer, one end of the first thermal insulation layer is fixed on the liner and the first thermal insulation layer is longitudinally spirally wound on the liner, one end of the second thermal insulation layer is fixed on the first thermal insulation layer and the second thermal insulation layer is longitudinally spirally wound on the first thermal insulation layer.

3. The liquid helium dewar of claim 2, further comprising a first cladding layer between the first and second thermal insulation layers.

4. The liquid helium dewar of claim 2, wherein the second thermal insulation layer is provided with a plurality of layers, the plurality of layers being sequentially longitudinally spirally wound on the first thermal insulation layer.

5. The liquid helium dewar of claim 1, wherein the second insulation layer set comprises a third insulation layer set having one end fixed to the first insulation layer set and longitudinally spirally wound thereon, and a fourth insulation layer set having one end fixed to the third insulation layer set and longitudinally spirally wound thereon.

6. The liquid helium dewar of claim 5, further comprising a second cladding layer between the third and fourth thermal insulation layers.

7. The liquid helium dewar according to claim 5, wherein each of the third and fourth heat insulating layers is provided with a plurality of layers, the plurality of layers of the third heat insulating layer being sequentially longitudinally spirally wound on the first heat insulating layer group and the first reflector, and the plurality of layers of the fourth heat insulating layer being sequentially longitudinally spirally wound on the third heat insulating layer.

8. The liquid helium dewar of claim 1, wherein the third insulation layer group comprises a fifth insulation layer having one end fixed to the second insulation layer group and longitudinally spirally wound on the second insulation layer group and the second reflector, and a sixth insulation layer having one end fixed to the fifth insulation layer and longitudinally spirally wound on the fifth insulation layer.

9. The liquid helium dewar of claim 8, further comprising a third cladding layer between the fifth thermal insulation layer and the sixth thermal insulation layer.

10. The liquid helium dewar according to claim 8, wherein each of the fifth thermal insulation layer and the sixth thermal insulation layer is provided with a plurality of layers, the fifth thermal insulation layer is sequentially longitudinally spirally wound on the second thermal insulation layer group and the second reflector, and the sixth thermal insulation layer is sequentially longitudinally spirally wound on the fifth thermal insulation layer.