CN1321282C - Cryogenic insulating and sealing method - Google Patents
Cryogenic insulating and sealing method Download PDFInfo
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- CN1321282C CN1321282C CNB021553521A CN02155352A CN1321282C CN 1321282 C CN1321282 C CN 1321282C CN B021553521 A CNB021553521 A CN B021553521A CN 02155352 A CN02155352 A CN 02155352A CN 1321282 C CN1321282 C CN 1321282C
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- alpha
- cylinder
- sealing
- cooling
- outer cylinder
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Abstract
The present invention relates to an insulating and sealing method which belongs to the field of deep cooling device manufacturing technology. Two sealed metal cylinders adopt different materials, are arranged in a coaxial position and are mutually nested, and low temperature sealing glue is filled between the metal cylinders to form a sealing connection structure. The cooling shrinkage rate of the outer cylinder is greater than that of the inner cylinder, the inner radius R2 of the outer cylinder and the outer radius R1 of the inner cylinder satisfy the relationship that R2 alpha 2 minus R1 alpha 1 approximately equals to 1.5 (R2-R1) alpha 3, wherein alpha 1, alpha 2 and alpha 3 are respectively the cooling shrinkage rate of the inner cylinder, the outer cylinder and the sealing glue. A bonding surface of the metal cylinders and the sealing glue can be always in a compression state during the cooling contraction by the difference of the cooling shrinkage rate of the two cylinders; thereby, the sealing damage caused by cracking is avoided, and the present invention is suitable for deep cooling environment.
Description
Technical field
The present invention relates to the insulation seal device under the low temperature, belong to cryogenic system manufacturing technology field.
Background technique
The high molecular polymer binder is used for the bonding and sealing under the room temperature, simple to operate, reliable performance.When being used for low temperature, because the cold shrinkage difference of different materials needs to adopt special structure, to avoid adhesive material to be subjected to big cold contractile force cracking appears.Because the cold shrinkage ratio metal of high molecular polymer insulating material such as epoxy resin is much bigger, structure shown in Figure 1 is adopted in the sealing between epoxy resin and the metal parts usually.In this structure, thin-wall metal pipe 2 and draw the outside that lead 3 all is in epoxy cap 1, the bonding plane during cold contraction between epoxy resin and the metal parts is in all the time and compresses, thereby cracking can not occur.Adopting thin-walled (about 0.25 millimeters thick) metal tube, is that metal tube is surrendered easily when making cold contraction, avoids epoxy resin to be subjected to big cold contractile force.
Also can in epoxy resin, add fillers such as alumina powder, aluminum nitride powder, make its cold shrinkage close with metal.
Also can adopt glass to carry out insulated enclosure, but the manufacturing process complexity.
Above-mentioned existing sealing structure existence connection bad mechanical strength, the shortcoming that the joint volume is bigger.
Summary of the invention
The purpose of this invention is to provide a kind of new low-temperature insulation seal arrangement, it has compact structure, characteristics that mechanical strength is high, and is applicable to any accessible cryogenic temperature.
The feature of the low-temperature insulation seal arrangement that the present invention proposes is, a metallic cylinder places in another metallic cylinder coaxially, two cylinders are that different materials is made, and the linear shrinkage ratio of outer cylinder is bigger than the linear shrinkage ratio of inner cylinder, is full of the low-temperature insulation sealer between two cylinders.
Description of drawings
Fig. 1 is the low-temperature insulation sealed structure chart of prior art, among the figure: 1 epoxy resin cap, 2 metal light wall pipes, 3 lead-in wires.
Fig. 2 is an insulation and sealing structure schematic representation of the present invention, among the figure: 4 outer cylinder, 5 electric insulating sealants, 6 inner cylinders.
Embodiment
Fig. 2 is an insulation and sealing structure schematic representation of the present invention.The outer radius R of inner cylinder wherein
1, outer cylinder inside radius R
2Between satisfy following relation:
R
2α
2-R
1α
1≈1.5(R
2-R
1)α
3 (1)
α in the formula
1, α
2, α
3Be respectively inner cylinder 6, outer cylinder 4 and the electric insulating sealant 5 cold shrinkage from the room temperature to low temperature.Following formula represents that owing to cold contraction, the contraction that reduces electric insulating sealant thickness in the ratio gap of the gap width between the inside and outside cylinder is (the former is 1.5 times of the latter) greatly when temperature reduces.Therefore, the insulated enclosure glue-line is in the inside and outside state of pressurized simultaneously all the time in the temperature reduction process, thereby the bonding cracking that can not occur between electric insulating sealant and the metal.
Be one embodiment of the present of invention below.Inner cylinder 6 is the red copper material in this embodiment, and outer cylinder 4 is a brass material, and electric insulating sealant 5 is a DW-3 low temperature glue.The inside radius R of outer cylinder 4
2=18mm.(" principle of low-temperature physic experiment and method " the 194th page reads up the literature, Science Press, 1985) red copper and brass (65Cu, 35Zn) linear shrinkage ratio from room temperature (20 ℃) to absolute zero point is respectively 0.00326 and 0.00384, and the linear shrinkage ratio of sealer (epoxy resin) is 0.0106.Get R by formula (1)
1=17.17mm.Present embodiment is got R
1=17.2mm.
Even for guaranteeing the gap between two cylinders, insert equably in the slit, cylinder two ends with the thin slice of suitable thickness.DW-3 is a kind of three component glue, and flowability is fine when just preparing.Do not spill when filling the space between two cylinders at low temperature glue when heating, with Instant cement one end is blocked earlier before filling.Cylinder is vertically placed, low temperature glue is injected in the slit room temperature or heating cure.
The sealability of the low temperature seal device that the employing said method is made is reliable, and repeatedly the cold cycling performance does not have significant change.Owing to can adopt thicker inside and outside cylinder, sealant layer is thin, and bonding plane is big, therefore has the characteristics that volume is little, mechanical strength is high.But this sealing configuration is applied to low-temperature (low temperature) vessel, liquid nitrogen, liquid helium experimental setup simplification device structure, reduces the device manufacture cost.
Claims (1)
- A kind of deep cooling insulation seal device, it comprises coaxial inside and outside two metallic cylinder and be filled in sealer between two cylinders, it is characterized in that: two sealed metallic cylinder adopt different materials, are in coaxial position, and mutually nested; The linear shrinkage ratio of outer cylinder is bigger than inner cylinder, outer cylinder inside radius R 2With inner cylinder outer radius R 1Between satisfy R 2α 2-R 1α 1≈ 1.5 (R 2-R 1) α 3Relation, α in the formula 1, α 2, α 3Be respectively the linear shrinkage ratio of inside and outside cylinder and sealer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021553521A CN1321282C (en) | 2002-12-11 | 2002-12-11 | Cryogenic insulating and sealing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021553521A CN1321282C (en) | 2002-12-11 | 2002-12-11 | Cryogenic insulating and sealing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1506600A CN1506600A (en) | 2004-06-23 |
| CN1321282C true CN1321282C (en) | 2007-06-13 |
Family
ID=34235867
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021553521A Expired - Fee Related CN1321282C (en) | 2002-12-11 | 2002-12-11 | Cryogenic insulating and sealing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1321282C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102523676A (en) * | 2011-12-29 | 2012-06-27 | 西北核技术研究所 | Self-expandable sealing target and manufacturing method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1244948A (en) * | 1969-03-07 | 1971-09-02 | Philips Nv | Means forming a vaccum-tight seal |
| CN2106333U (en) * | 1991-11-25 | 1992-06-03 | 何曙安 | Liquid nitrogen metal dewar bottle of refrigerating 180 units infrared devices |
| US5228703A (en) * | 1992-02-18 | 1993-07-20 | Ronald White | Sealing member |
-
2002
- 2002-12-11 CN CNB021553521A patent/CN1321282C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1244948A (en) * | 1969-03-07 | 1971-09-02 | Philips Nv | Means forming a vaccum-tight seal |
| CN2106333U (en) * | 1991-11-25 | 1992-06-03 | 何曙安 | Liquid nitrogen metal dewar bottle of refrigerating 180 units infrared devices |
| US5228703A (en) * | 1992-02-18 | 1993-07-20 | Ronald White | Sealing member |
Non-Patent Citations (4)
| Title |
|---|
| DW型低温胶在大型制氧装置上的应用工艺 江镇海，化工生产与技术，第3期 1997 * |
| DW型低温胶在大型制氧装置上的应用工艺 江镇海，化工生产与技术，第3期 1997;双环氧树脂灌封胶的研制 张继新，黄春娟，张瑛，试验与研究－化学与粘合 2001;轴向温度作用自赋能（自紧）式深冷密封结构研究 牛宝林，导弹与航天运载技术，第6期 2000 * |
| 双环氧树脂灌封胶的研制 张继新，黄春娟，张瑛，试验与研究－化学与粘合 2001 * |
| 轴向温度作用自赋能（自紧）式深冷密封结构研究 牛宝林，导弹与航天运载技术，第6期 2000 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1506600A (en) | 2004-06-23 |
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