CN102661482B - Nonmetal magnetism-free liquid nitrogen dewar - Google Patents
Nonmetal magnetism-free liquid nitrogen dewar Download PDFInfo
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- CN102661482B CN102661482B CN201210122287.6A CN201210122287A CN102661482B CN 102661482 B CN102661482 B CN 102661482B CN 201210122287 A CN201210122287 A CN 201210122287A CN 102661482 B CN102661482 B CN 102661482B
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Abstract
The invention discloses a nonmetal magnetism-free liquid nitrogen dewar which is composed of a vacuum cover and a dewar liner (1). The vacuum cover comprises an outer casing (2) and a cover plate (3), the dewar liner (1) is arranged inside the outer casing (2), at least one liquid inlet tube (4) or liquid outlet tube (5) is arranged on the dewar liner (1), at least one circular hole (6) is arranged on the cover plate (3), the circular hole (6) is matched with the liquid inlet tube (4) or the liquid outlet tube (5), a heat insulation layer (7) is arranged at the periphery of the dewar liner (1), a through hole (8) is arranged in the middle of the cover plate (3), the diameter of the through hole (8) is matched with the inner diameter of the dewar liner (1), and a vacuum pumping port (9) is further arranged on the cover plate (3). By means of the structure, the nonmetal magnetism-free liquid nitrogen dewar can be used for installing a high temperature superconducting radio frequency coil, simultaneously has the effects of containing liquid nitrogen and cooling the high temperature superconducting radio frequency coil.
Description
Technical field
The present invention relates to a kind of Dewar container for liquefied nitrogen, relate in particular to a kind of nonmetal Dewar container for liquefied nitrogen device that is used for splendid attire liquid nitrogen and installation, cooling high-temperature superconducting radio-frequency coil.
Background technique
The inner metallic material that mostly adopts of current existing Dewar is made, for example: stainless steel material, because shell is used metallic material, make shell can shield magnetic resonance imaging signal, in addition, Dewar metallic material has magnetic, magnetic resonance imaging signal is impacted, also there is on the market nonmetal Non-magnetic dewar, existing nonmetal Dewar is mainly used to holding low-temperature liquid, can not lay high-temperature superconductive radio-frequency coil, and the part-structure in Dewar is still being used metal species material, for example: stainless steel, aluminium foil etc., although use amount is little, but still can shield magnetic resonance imaging signal, affect imaging effect.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of non-magnetic Dewar container for liquefied nitrogen, and this Dewar container for liquefied nitrogen, simultaneously also can splendid attire liquid nitrogen for the high-temperature superconductive radio-frequency coil of using with cooling magnetic resonance imaging is installed.
In order to solve the problems of the technologies described above, the invention provides a kind of nonmetal non-magnetic Dewar container for liquefied nitrogen, it is by evacuated housing, Dewar inner bag forms, described evacuated housing comprises shell and cover plate, described Dewar inner bag is arranged at enclosure, described Dewar inner bag is provided with at least one liquid inlet pipe or drain pipe, described cover plate is provided with at least one circular hole, described circular hole and liquid inlet pipe or drain pipe are suitable, described Dewar inner bag is arranged with heat insulation layer outward, heat insulation layer is multi-layer structure, described heat insulation layer is made by thermoinsulation material, described thermoinsulation material comprises pearlife or silica dioxide gel felt, described cover plate middle part is provided with through hole, described through-hole diameter and Dewar inner bag internal diameter are suitable, on described cover plate, be also provided with vacuum pumping port.Described shell and Dewar inner bag are made by nonmetal non-magnetic material, described nonmetal non-magnetic material comprises glass fibre reinforced plastics or epoxy resin or polyphenyl ether ether ketone composite material, between described Dewar inner bag and shell, be provided with vacuum layer, and keeping enclosure high vacuum state by sorbent, described Dewar inner bag and evacuated housing form by nonmetal nonmagnetic low temperature resistant glue bonding.
Adopt said structure, its beneficial effect is: described Dewar inner bag is arranged at enclosure, cover plate middle part is provided with through hole, described through-hole diameter and Dewar inner bag internal diameter are suitable, the high-temperature superconductive radio-frequency coil that magnetic resonance imaging is used can be installed, for knee joint or head magnetic resonance scanning imagery on Dewar inner bag; Described shell and Dewar inner bag are made by nonmetal non-magnetic material, described nonmetal non-magnetic material comprises glass fibre reinforced plastics or epoxy resin or polyphenyl ether ether ketone composite material, can shielded radio frequency signal, do not affect magnetic resonance imaging, for high-temperature superconductive radio-frequency coil provides good working environment; Described heat insulation layer is made by thermoinsulation material, and described thermoinsulation material comprises pearlife or silica dioxide gel felt, reduces Dewar and leaks heat, extends liquid nitrogen service time.
Between described Dewar inner bag and shell, be provided with vacuum layer, and keep the inner high vacuum state of Dewar by sorbent, on described cover plate, be also provided with vacuum pumping port, vacuum pumping port is connected with seal valve, can keep enclosure to seal completely, air tight, there is good sealing effect; Described Dewar inner bag is provided with at least one liquid inlet pipe or drain pipe, described cover plate is provided with circular hole, and described circular hole and liquid inlet pipe or drain pipe are suitable, and described liquid inlet pipe or drain pipe are double layer construction, guarantee that liquid nitrogen reduces and leaks heat when flowing into or flowing out Dewar inner bag, safe and applicable.
Accompanying drawing explanation
Fig. 1 is the structural representation of non-magnetic Dewar container for liquefied nitrogen of the present invention.
In figure: 1-Dewar inner bag, 2-shell, 3-cover plate, 4-liquid inlet pipe, 5-drain pipe, 6-circular hole, 7-heat insulation layer, 8-through hole, 9-vacuum pumping port, 10-vacuum layer.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
As shown in Figure 1, a kind of nonmetal non-magnetic Dewar container for liquefied nitrogen, it is by evacuated housing, Dewar inner bag 1 forms, described evacuated housing comprises shell 2 and cover plate 3, described Dewar inner bag 1 is arranged at shell 2 inside, described shell 2 and Dewar inner bag 1 are made by nonmetal non-magnetic material, described nonmetal non-magnetic material comprises glass fibre reinforced plastics or epoxy resin or polyphenyl ether ether ketone composite material, described Dewar inner bag 1 is provided with at least one liquid inlet pipe 4 or drain pipe 5, described cover plate 3 is provided with at least one circular hole 6, described circular hole 6 is suitable with liquid inlet pipe 4 or drain pipe 5, the outer heat insulation layer 7 that is arranged with of described Dewar inner bag 1, heat insulation layer 7 is multi-layer structure, described heat insulation layer 7 is made by thermoinsulation material, described thermoinsulation material comprises pearlife or silica dioxide gel felt, described cover plate 3 middle parts are provided with through hole 8, described through hole 8 diameters and Dewar inner bag 1 internal diameter are suitable, on described cover plate 3, be also provided with vacuum pumping port 9.
Between described Dewar inner bag 1 and shell 2, be provided with vacuum layer 10, and keep the inner high vacuum state of shell 2 by sorbent.
Described Dewar inner bag 1 forms by nonmetal nonmagnetic low temperature resistant glue bonding with evacuated housing.
First cover plate 3 is installed on shell 2, Dewar inner bag 1 is provided with two liquid inlet pipes 4 or drain pipe 5, cover plate 3 is provided with two circular holes 6, liquid inlet pipe 4 or drain pipe 5 are through circular hole 6, after cover plate 3 and shell 2 combinations, form Dewar container for liquefied nitrogen shell, high-temperature superconductive radio-frequency coil is installed on Dewar inner bag 1, cover plate 3 middle parts are provided with through hole 8, this through hole 8 is open through-hole structure, through hole 8 diameters and Dewar inner bag 1 internal diameter are suitable, after merging, through hole 8 and Dewar inner bag internal diameter overlap, through hole 8 is used for placing imaging object, Dewar inner bag 1 is arranged at shell 2 inside, Dewar inner bag 1 is shaped as annular tank structure, be used for splendid attire liquid nitrogen and cooling high-temperature superconducting radio-frequency coil, on cover plate 3, be also provided with vacuum pumping port 9, between Dewar inner bag 1 and shell 2, be provided with vacuum layer 10, after Dewar vacuumizes end for can 2.
Liquid nitrogen flows into Dewar inner bag 1 inside by liquid inlet pipe 4, Dewar inner bag 1 outside is in vacuum state, Dewar inner bag 1 is connected with high-temperature superconductive radio-frequency coil, by its cooling down, unnecessary liquid nitrogen flows out by drain pipe 5, and whole Dewar container for liquefied nitrogen parts adopt glass fibre reinforced plastic material to make, and heat insulation layer 7 adopts pearlife or silica dioxide gel felt material to make, can shielded radio frequency signal, for high-temperature superconductive radio-frequency coil provides good working environment.
Claims (2)
1. be used for the nonmetal Dewar container for liquefied nitrogen of splendid attire liquid nitrogen and cooling high-temperature superconducting radio-frequency coil, it is comprised of evacuated housing and Dewar inner bag (1), described evacuated housing comprises shell (2) and cover plate (3), described Dewar inner bag (1) is arranged at shell (2) inside, the outer heat insulation layer (7) that is arranged with of described Dewar inner bag (1), on described cover plate (3), be also provided with vacuum pumping port (9), it is characterized in that: described Dewar inner bag (1) is provided with double-deck liquid inlet pipe (4) and drain pipe (5), described cover plate (3) is provided with at least one circular hole (6), described circular hole (6) is suitable with liquid inlet pipe (4) and drain pipe (5), described cover plate (3) middle part is provided with through hole (8), through hole (8) diameter and Dewar inner bag (1) internal diameter are suitable, after merging, through hole (8) and Dewar inner bag internal diameter overlap, through hole (8) is used for placing imaging object, Dewar inner bag (1) is arranged at shell (2) inside, Dewar inner bag (1) is shaped as annular tank structure, be used for splendid attire liquid nitrogen and cooling high-temperature superconducting radio-frequency coil, described heat insulation layer (7) is multi-layer structure, described heat insulation layer (7) is made by thermoinsulation material, described thermoinsulation material comprises pearlife or silica dioxide gel felt.
2. be used for according to claim 1 the nonmetal Dewar container for liquefied nitrogen of splendid attire liquid nitrogen and cooling high-temperature superconducting radio-frequency coil, it is characterized in that: described shell (2) and Dewar inner bag (1) are made by nonmetal non-magnetic material, described nonmetal non-magnetic material comprises glass fibre reinforced plastics or epoxy resin or polyphenyl ether ether ketone composite material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210122287.6A CN102661482B (en) | 2012-04-25 | 2012-04-25 | Nonmetal magnetism-free liquid nitrogen dewar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210122287.6A CN102661482B (en) | 2012-04-25 | 2012-04-25 | Nonmetal magnetism-free liquid nitrogen dewar |
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| Publication Number | Publication Date |
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| CN102661482A CN102661482A (en) | 2012-09-12 |
| CN102661482B true CN102661482B (en) | 2014-12-10 |
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| CN201210122287.6A Active CN102661482B (en) | 2012-04-25 | 2012-04-25 | Nonmetal magnetism-free liquid nitrogen dewar |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103129843B (en) * | 2013-03-12 | 2015-01-07 | 北京宇航世纪超导技术有限公司 | Non-magnetic cryogenic container used for high-speed operation of high-temperature superconductivity maglev system and manufacturing method of non-magnetic cryogenic container |
| CN104188650B (en) * | 2014-09-26 | 2016-07-20 | 北京美尔斯通科技发展股份有限公司 | Non-shielded magnetocardiograph |
| CN104943162A (en) * | 2015-05-05 | 2015-09-30 | 上海和鸣变压器有限公司 | Glass steel barrel manufacturing technology for superconducting transformer |
| CN105870775B (en) * | 2016-05-24 | 2020-07-10 | 中国人民解放军战略支援部队航天工程大学 | Integrated inert gas frequency reference device for laser frequency locking |
| CN105957684B (en) * | 2016-06-28 | 2018-04-24 | 上海烙嘉科技有限公司 | Superconduction Dewar tank |
| CN110690023A (en) * | 2019-10-31 | 2020-01-14 | 株洲联诚集团控股股份有限公司 | Dewar for superconducting power device |
| CN110957098B (en) * | 2019-11-04 | 2021-10-12 | 中车工业研究院有限公司 | High-temperature superconducting magnet supporting device and magnetic levitation train |
| CN111804212B (en) * | 2020-07-08 | 2021-10-26 | 北京中科富海低温科技有限公司 | Dewar device with magnetic stirring |
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| CN1356491A (en) * | 2001-12-30 | 2002-07-03 | 上海交通大学 | High-frequency non-magnetic Dewar container for liquefied nitrogen |
| CN1554917A (en) * | 2003-12-19 | 2004-12-15 | 上海交通大学 | Adjustable distance liquid nitrogen metal dewar for high temperature super conductive quantum interferometer |
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| JPS60155099A (en) * | 1984-01-21 | 1985-08-14 | Sumitomo Electric Ind Ltd | Low-temperature liquid container |
| JP3557984B2 (en) * | 2000-02-03 | 2004-08-25 | 株式会社日立製作所 | Dewar and biomagnetic field measurement device using the same |
| CN101307862B (en) * | 2008-05-12 | 2011-03-30 | 中国科学院等离子体物理研究所 | Conduction cooling superconducting magnet dewar convenient for loading and unloading |
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- 2012-04-25 CN CN201210122287.6A patent/CN102661482B/en active Active
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| CN1356491A (en) * | 2001-12-30 | 2002-07-03 | 上海交通大学 | High-frequency non-magnetic Dewar container for liquefied nitrogen |
| CN1584386A (en) * | 2003-08-18 | 2005-02-23 | 新疆特变电工股份有限公司 | Nonmetallic composite low thermal leak Dewar type container |
| CN1554917A (en) * | 2003-12-19 | 2004-12-15 | 上海交通大学 | Adjustable distance liquid nitrogen metal dewar for high temperature super conductive quantum interferometer |
| CN102062843A (en) * | 2010-11-23 | 2011-05-18 | 中国科学院电工研究所 | Open type superconductivity MRI (magnetic resonance imaging) magnet system with iron core and capable of cancelling electromagnetic force by self |
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| 传导冷却磁分离用高温超导磁体的杜瓦设计;周超 汪良斌;《低温物理学报》;20090531;第31卷(第2期);第154页 * |
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| CN102661482A (en) | 2012-09-12 |
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