CN201753830U - Dewar type container with sapphire part - Google Patents
Dewar type container with sapphire part Download PDFInfo
- Publication number
- CN201753830U CN201753830U CN2010202576944U CN201020257694U CN201753830U CN 201753830 U CN201753830 U CN 201753830U CN 2010202576944 U CN2010202576944 U CN 2010202576944U CN 201020257694 U CN201020257694 U CN 201020257694U CN 201753830 U CN201753830 U CN 201753830U
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- type container
- wall
- dewar type
- sapphire
- superconductor
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Abstract
A Dewar type container with a sapphire part comprises a tank body and a top cover (12); the tank body is composed of an inner wall (4) and an outer wall (2), and a vacuum interlayer is formed between the inner wall and the outer wall, and the Dewar type container is characterized in that: the middle of the bottom of the inner wall (4) is constructed by a sapphire piece (15), a superconductor (16) is fixedly adhered on the lower surface of the sapphire piece (15), and the distance between the lower surface of the superconductor (16) and the inner surface of the outer wall (2) is 0.8-1mm. in the Dewar type container, the distance between the superconductor and a magnet outside the Dewar type container is effectively reduced, the vortex of the Dewar type container caused by the external magnetic field also can be effectively weakened, and the heat preservation effect of the Dewar type container and the superconductor is good.
Description
Technical field
The utility model relates to the employed Dewar type container 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 type container (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 type container has been proposed very high requirement.Simultaneously, give full play to its effect for making the superconducting material that is placed in the Dewar type container, 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 type container of dress liquid nitrogen and superconducting coil requires thin as much as possible.This has just made restriction to the structure of Dewar type container, and its wall thickness is to get over Bao Yuehao.
In addition, because when Dewar type container is in the external magnetic field of variation, metal parts in the Dewar type container 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 type container, thereby influence systematic function, even may cause the suspension system collapse, this also is a kind of restriction to the Dewar type container 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.
The model utility content
The purpose of this utility model provides a kind of Dewar type container that contains the sapphire parts, this Dewar type container can effectively reduce the distance between superconductor and the Dewar type container magnet outward, can weaken the eddy current that external magnetic field causes, the high insulating effect of Dewar type container and superconductor effectively again in Dewar type container.
The technological scheme that its goal of the invention that realizes the utility model adopts is: a kind of Dewar type container that contains the sapphire parts, 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 beneficial effects of the utility model are:
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 type container 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 type container 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 type container, increase the mechanical strength of Dewar type container 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 type container outer wall outer surface, can reduce the decisive range between the outer magnet that interacts of superconductor and Dewar type container 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 type container 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 utility model is described in more detail below in conjunction with the drawings and specific embodiments
Description of drawings
Fig. 1 is the utility model embodiment's a sectional structure schematic representation, and 17 is liquid nitrogen or liquid helium among the figure.
Embodiment
Embodiment
Fig. 1 illustrates, a kind of embodiment of the present utility model is: a kind of Dewar type container that contains the sapphire parts, 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 type container outer wall 2 bottoms, in order to obtain better mechanical strength, other parts of Dewar type container inwall 4, outer wall 2 can be thickeied as required.
Claims (7)
1. Dewar type container that contains the sapphire parts, 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 type container that contains the sapphire parts 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 type container that contains the sapphire parts 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 type container that contains the sapphire parts 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 type container that contains the sapphire parts 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 type container that contains the sapphire parts 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 type container that contains the sapphire parts 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 |
|---|---|---|---|
| CN2010202576944U CN201753830U (en) | 2010-07-14 | 2010-07-14 | Dewar type container with sapphire part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202576944U CN201753830U (en) | 2010-07-14 | 2010-07-14 | Dewar type container with sapphire part |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201753830U true CN201753830U (en) | 2011-03-02 |
Family
ID=43621562
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202576944U Expired - Fee Related CN201753830U (en) | 2010-07-14 | 2010-07-14 | Dewar type container with sapphire part |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201753830U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102166538A (en) * | 2011-05-09 | 2011-08-31 | 兰州大学 | Device for providing low-temperature environment |
| CN102540114A (en) * | 2011-06-01 | 2012-07-04 | 兰州大学 | Device for measuring characteristics of ultra-magnetostrictive material under extremely low temperature environment |
| CN107120522A (en) * | 2017-06-06 | 2017-09-01 | 西南交通大学 | A kind of thin bottom Dewar of high-temperature superconductor permanent magnet suspension low drain heat |
| CN109003774A (en) * | 2018-06-26 | 2018-12-14 | 西南交通大学 | A kind of floating Dewar of high-temperature superconductor magnetic |
-
2010
- 2010-07-14 CN CN2010202576944U patent/CN201753830U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102166538A (en) * | 2011-05-09 | 2011-08-31 | 兰州大学 | Device for providing low-temperature environment |
| CN102540114A (en) * | 2011-06-01 | 2012-07-04 | 兰州大学 | Device for measuring characteristics of ultra-magnetostrictive material under extremely low temperature environment |
| CN102540114B (en) * | 2011-06-01 | 2014-07-16 | 兰州大学 | Device for measuring characteristics of ultra-magnetostrictive material under extremely low temperature environment |
| CN107120522A (en) * | 2017-06-06 | 2017-09-01 | 西南交通大学 | A kind of thin bottom Dewar of high-temperature superconductor permanent magnet suspension low drain heat |
| CN109003774A (en) * | 2018-06-26 | 2018-12-14 | 西南交通大学 | A kind of floating Dewar of high-temperature superconductor magnetic |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110302 Termination date: 20130714 |