CN101881370A - Dewar flask - Google Patents
Dewar flask Download PDFInfo
- Publication number
- CN101881370A CN101881370A CN 201010227046 CN201010227046A CN101881370A CN 101881370 A CN101881370 A CN 101881370A CN 201010227046 CN201010227046 CN 201010227046 CN 201010227046 A CN201010227046 A CN 201010227046A CN 101881370 A CN101881370 A CN 101881370A
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- wall
- dewar vessel
- superconductor
- inwall
- dewar
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Abstract
The invention relates to a dewar flask which comprises a flask body and a top cover (12); the flask body comprises an inner wall (4) and an outer wall (2); a vacuum interlayer is formed between the inner wall and the outer wall; the flask is characterized in that the middle part of the bottom of the inner wall (4) comprises a sapphire film (15); a superconductor (16) is spliced and fixed on the lower surface of the sapphire film (15); and the distance between the lower surface of the superconductor (16) and the inner surface of the outer wall (2) is 0.8 to 1mm. The dewar flask can effectively reduce the distance between the superconductor and a magnet body outside the dewar bottle and effectively weaken the vortex of an external magnetic field in the dewar bottle, and the heat insulating effect of the dewar bottle and the superconductor is good.
Description
Technical field
The present invention relates to the employed Dewar vessel of a kind of superconductor applications.
Background technique
For making superconducting material be in superconducting state, superconducting material need be remained under the low-temperature condition.The practice commonly used is that superconducting material is immersed in (as: liquid nitrogen or liquid helium) in the cooling liquid, and cooling liquid is contained in the Dewar vessel, to keep low temperature, avoids the explosive evaporation of cooling liquid.
The desired temperature of superconduction is lower than 90K, keep such low temperature, and Dewar vessel has been proposed very high requirement.Simultaneously, give full play to its effect for making the superconducting material that is placed in the Dewar vessel, also require the distance between superconductor and the outside magnet (electromagnetic coil or permanent magnet) that is under the room temperature condition near more good more, so that the effect between superconduction and the magnet strengthens, thereby can improve the performance of whole system.For example: in the superconducting linear motor, the superconduction field coil remains on liquid nitrogen temperature, and armature is under the room temperature state.The superconduction field coil is near more from armature, and the driving force of generation is big more, apart from increase driving force is reduced.Therefore, for improving motor performance, the base thickness of the Dewar vessel of dress liquid nitrogen and superconducting coil requires thin as much as possible.This has just made restriction to the structure of Dewar vessel, and its wall thickness is to get over Bao Yuehao.
In addition, because when Dewar vessel is in the external magnetic field of variation, metal parts in the Dewar vessel can induce eddy current in the variation magnetic field, eddy current causes eddy current loss and causes the moment rising of metal parts temperature, if metal parts contacts with superconduction block material or liquid nitrogen, then can cause the superconduction block material temperature to raise, influence the thermal insulation property of Dewar vessel, thereby influence systematic function, even may cause the suspension system collapse, this also is a kind of restriction to the Dewar vessel structure.
The Chinese patent of the patent No. 200810219415.2 discloses another Dewar vessel, comprises matrix, and matrix comprises inner and outer wall, and inner wall surface has one deck reflection material, and matrix is prepared from by plastics.Though the material of this Dewar is a non-metallic material, avoided the generation of eddy current, but, made the distance of the outer magnetic field sources of superconductor and Dewar bigger because superconductor is separated with vacuum sandwich mutually with bottom outer surface, limited the interaction between the two.
Summary of the invention
The purpose of this invention is to provide a kind of Dewar vessel, this Dewar vessel can effectively reduce the distance between superconductor and the Dewar vessel magnet outward, can weaken the eddy current that external magnetic field causes, the high insulating effect of Dewar vessel and superconductor effectively again in Dewar vessel.
The present invention realizes that the technological scheme that its goal of the invention adopts is: a kind of Dewar vessel, comprise tank body and top cover, tank body is made up of inner and outer wall, form the interlayer of vacuum between the inner and outer wall, its structural feature is: inwall is made of sapphire sheet in the middle of the bottom, superconductor is adhesively fixed on the lower surface of sapphire sheet, and the distance between the lower surface of superconductor and outer wall internal surface is 0.8-1mm.
Compared with prior art, the invention has the beneficial effects as follows:
Place its upper surface of vacuum sandwich and sapphire lower surface to fit tightly superconductor, because sapphire has splendid thermal conductivity in liquid nitrogen temperature, be much better than copper at its heat-conducting property of 77K, therefore the low temperature of liquid nitrogen region can be that medium conducts to superconductor by sapphire sheet well, the good cooling results of superconductor.The sapphire sheet of fitting with superconductor is an insulating material, the time external magnetic field that becomes in the time, sapphire sheet can not produce the eddy current temperature rise, has further guaranteed the refrigeration heat insulation effect of superconductor yet.Simultaneously, superconductor is except that upper surface, and other each surface all is in the vacuum layer, is also isolated by vacuum layer between the liquid nitrogen and the external world, makes insulation, the good heat-insulation effect of superconductor and liquid nitrogen, and the superconduction physical efficiency keeps the state of cooling well.
In the prior art, superconductor is immersed in inwall with in the interior liquid nitrogen region, and the distance of superconductor and outer magnet is greater than the thickness sum of inside and outside wall and vacuum sandwich; And the utility model since superconductor be in the vacuum sandwich between the inside and outside wall, distance between its lower surface and outer wall internal surface is 0.8-1mm, the outer magnet distance of superconductor and Dewar vessel is dwindled greatly, distance can narrow down to 2.5mm, strengthen the interaction force between superconductor and the magnet, improved the performance of whole magnetic suspension system.
Part and the top cover of above-mentioned inwall except that the sapphire sheet of bottom made by epoxy glass plate.
Like this, the epoxy glass plate that is thermal insulation and insulation with part that liquid nitrogen directly contacts constitutes, and it can have heat insulation effect well; Simultaneously, when Dewar vessel is in the external magnetic field of variation, can induce eddy current and produce temperature rise, further guarantee refrigeration, the heat insulation effect of liquid nitrogen and superconductor.
On the sapphire sheet of inwall bottom be entrenched on the inwall, and chimeric position is with the sealing of low temperature glue.
Like this, sapphire sheet can be fixed on the inwall preferably, and can guarantee the sealing of inwall again.
Be provided with support between the above-mentioned inwall bottom and the bottom of outer wall.
Can when not increasing the inside and outside wall thickness of Dewar vessel, increase the mechanical strength of Dewar vessel like this.
The wall thickness of above-mentioned outer wall bottom is 1-1.5mm.
In the thickness 2.5mm of the lower surface of superconductor apart from Dewar vessel outer wall outer surface, can reduce the decisive range between the outer magnet that interacts of superconductor and Dewar vessel to greatest extent like this.
Above-mentioned closure stud fastens at the top of tank body and covers a jar mouthful place, and top cover is provided with the relief opening of inlet and band check valve, and the outer wall side is provided with the mouth of bleeding.
Inlet on the top cover can inject liquid nitrogen easily in the inwall chamber, the gas that liquid-nitrogen boiling produces can avoid the higher gas backstreaming of temperature in Dewar by being discharged by the relief opening of band check valve.The mouth of establishing by the outer wall side of bleeding can vacuumize the interlayer between inner and outer wall easily.
Above-mentioned outer wall is that stainless steel material is made.Can guarantee the mechanical strength of whole Dewar vessel like this.Simultaneously since between itself and the inwall with vacuum screened, it also can not influence the heat insulating effect of liquid nitrogen.
The present invention will be further described in detail below in conjunction with the drawings and specific embodiments
Description of drawings
Fig. 1 is the sectional structure schematic representation of the embodiment of the invention, and 17 is liquid nitrogen or liquid helium among the figure.
Embodiment
Embodiment
Fig. 1 illustrates, a kind of embodiment of the present invention is: a kind of Dewar vessel, comprise tank body and top cover 12, tank body is made up of inwall 4 and outer wall 2, form the interlayer of vacuum between the inner and outer wall, it is characterized in that: be made of sapphire sheet 15 in the middle of inwall 4 bottoms, superconductor 16 is adhesively fixed on the lower surface of sapphire sheet 15, and the distance between the lower surface of superconductor 16 and outer wall 2 internal surfaces is 0.8-1mm.
Part and the top cover 12 of inwall 4 except that bottom sapphire sheet 15 made by epoxy glass plate.The sapphire sheet 15 of inwall 4 bottoms is entrenched on the inwall 4, and chimeric position seals with low temperature glue.
Be provided with between the bottom of inwall 4 bottoms and outer wall 2 and support 9.The wall thickness of outer wall 2 bottoms is 1-1.5mm.
The top that top cover 12 bolton fix on tank body covers a jar mouthful place, and top cover 12 is provided with the relief opening 13 of inlet 11 and band check valve, and outer wall 2 sides are provided with the mouth 14 of bleeding.Outer wall 2 is made for stainless steel material.
In this example, the shape of the sapphire sheet 15 of inwall 4 bottoms interlocking is by the superconductor shape decision of need cooling.Sapphire sheet 15 can be monocrystalline or polycrystalline, and sapphire sheet 15 is used the sealing of low temperature glue with the chimeric position of inwall 4 bottoms.
During enforcement, except Dewar vessel outer wall 2 bottoms, in order to obtain better mechanical strength, other parts of Dewar vessel inwall 4, outer wall 2 can be thickeied as required.
Claims (7)
1. Dewar vessel, comprise tank body and top cover (12), tank body is made up of inwall (4) and outer wall (2), form the interlayer of vacuum between the inner and outer wall, it is characterized in that: inwall (4) is made of sapphire sheet (15) in the middle of the bottom, superconductor (16) is adhesively fixed on the lower surface of sapphire sheet (15), and the distance between the lower surface of superconductor (16) and outer wall (2) internal surface is 0.8-1mm.
2. a kind of Dewar vessel according to claim 1 is characterized in that: part and the top cover (12) of described inwall (4) except that bottom sapphire sheet (15), make by epoxy glass plate.
3. a kind of Dewar vessel according to claim 1 is characterized in that: the sapphire sheet (15) of described inwall (4) bottom is entrenched on the inwall (4), and chimeric position seals with low temperature glue.
4. a kind of Dewar vessel according to claim 1 is characterized in that: be provided with support (9) between the bottom of described inwall (4) bottom and outer wall (2).
5. a kind of Dewar vessel according to claim 1 is characterized in that: the wall thickness of described outer wall (2) bottom is 1-1.5mm.
6. a kind of Dewar vessel according to claim 1, it is characterized in that: the top that described top cover (12) bolton fixes on tank body covers a jar mouthful place, top cover (12) is provided with the relief opening (13) of inlet (11) and band check valve, and outer wall (2) side is provided with the mouth of bleeding (14).
7. a kind of Dewar vessel according to claim 1 is characterized in that: described outer wall (2) is made for stainless steel material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010227046 CN101881370A (en) | 2010-07-14 | 2010-07-14 | Dewar flask |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010227046 CN101881370A (en) | 2010-07-14 | 2010-07-14 | Dewar flask |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101881370A true CN101881370A (en) | 2010-11-10 |
Family
ID=43053455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010227046 Pending CN101881370A (en) | 2010-07-14 | 2010-07-14 | Dewar flask |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101881370A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107068323A (en) * | 2017-06-22 | 2017-08-18 | 四川菲创能达科技有限公司 | A kind of high-temperature superconducting magnet liquid nitrogen automatic filling refrigerating plant |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3611746A (en) * | 1968-03-26 | 1971-10-12 | Siemens Ag | Cryostat for cooling vacuum-housed radiation detector |
| EP1009039A2 (en) * | 1998-12-11 | 2000-06-14 | Sumitomo Electric Industries, Ltd. | Apparatus for cooling superconductor |
| CN100402915C (en) * | 2006-02-16 | 2008-07-16 | 北京英纳超导技术有限公司 | Dewar flask |
-
2010
- 2010-07-14 CN CN 201010227046 patent/CN101881370A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3611746A (en) * | 1968-03-26 | 1971-10-12 | Siemens Ag | Cryostat for cooling vacuum-housed radiation detector |
| EP1009039A2 (en) * | 1998-12-11 | 2000-06-14 | Sumitomo Electric Industries, Ltd. | Apparatus for cooling superconductor |
| CN100402915C (en) * | 2006-02-16 | 2008-07-16 | 北京英纳超导技术有限公司 | Dewar flask |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107068323A (en) * | 2017-06-22 | 2017-08-18 | 四川菲创能达科技有限公司 | A kind of high-temperature superconducting magnet liquid nitrogen automatic filling refrigerating plant |
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| PB01 | Publication | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20101110 |