CN1506600A - Cryogenic insulating and sealing method - Google Patents
Cryogenic insulating and sealing method Download PDFInfo
- Publication number
- CN1506600A CN1506600A CNA021553521A CN02155352A CN1506600A CN 1506600 A CN1506600 A CN 1506600A CN A021553521 A CNA021553521 A CN A021553521A CN 02155352 A CN02155352 A CN 02155352A CN 1506600 A CN1506600 A CN 1506600A
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- cylinder
- cylinders
- sealing
- outer cylinder
- cryogenic
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Abstract
The cryogenic insulating and sealing method is belongs to the field of cryogenic apparatus manufacturing technology. Two cylinders of different metal materials to be sealed are made to in coaxial and embedding position, and low temperature sealing glue is filled between the two metal cylinders to constitute sealing and connecting structure. The outer cylinder has cold shrinkage greater than that of the inside cylinder, and the radii of the outer cylinder and the inside cylinder and the shrinkages of the outer cylinder, the inside cylinder and the sealing glue meet certain relational expression. By means of the shrinkage difference between the two cylinders, the adhering interfaces between each of the cylinders and the sealing glue are always in compressed state so as to avoid damage in sealing caused by cracking in cryogenic environment.
Description
Technical field
The present invention relates to the insulated enclosure method under the low temperature, belong to deep cooling seal arrangement 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, the bonding plane during cold the contraction between epoxy 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, 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 method existence connection bad mechanical strength, the shortcoming that the joint volume is bigger.
Summary of the invention
The invention provides a kind of new deep cooling insulated enclosure method, it has compact structure, characteristics that mechanical strength is high, and is applicable to any accessible cryogenic temperature.The feature of deep cooling insulated enclosure method of the present invention is, a metallic cylinder is placed in another metallic cylinder coaxially, two cylinders are that different materials is made, and the cold shrinkage of the cold shrinkage ratio inner cylinder of outer cylinder is big, is full of the low-temperature insulation sealer between two cylinders.
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 the cold shrinkage of inside and outside cylinder and sealer.Following formula represents, when temperature reduces because inside and outside the cold contraction contraction that reduces sealing compound layer thickness in the ratio gap of the gap width between the cylinder big, the former is 1.5 times of the latter.Therefore, the insulation 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 glue and the metal.
Description of drawings
Fig. 1 is the low-temperature insulation sealed structure chart of prior art, 1---epoxy cap, 2---metal light wall pipe, 3---lead-in wire among the figure.The deep cooling insulation and sealing structure figure that Fig. 2 proposes for the present invention, 1---outer cylinder, 2---sealer, 3---inner cylinder among the figure.
Embodiment
Be one embodiment of the present of invention below.Inner cylinder 3 is the red copper material in this embodiment, and outer cylinder 1 is a brass material, and sealer 2 is a DW-3 low temperature glue.The inside radius R of outer cylinder 1
2=18mm.Read up the literature red copper and brass (65Cu, 35Zn) linear shrinkage ratio from room temperature (20 ℃) to absolute zero point is respectively 0.00326 and 0.00384, 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.Because DW-3 low temperature glue mobile fine, when particularly heating, do not spill when filling the space between two cylinders at low temperature glue, one end is blocked earlier before filling with Instant cement.Cylinder is vertically placed, low temperature glue is injected in the slit room temperature or heating cure.
The sealability of the deep cooling seal arrangement 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)
1, a kind of deep cooling insulated enclosure method, 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 cold shrinkage ratio inner cylinder of outer cylinder is big, outer cylinder inside radius (R
2) and inner cylinder outer radius (R
1) between 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 cold shrinkage 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 true CN1506600A (en) | 2004-06-23 |
| CN1321282C 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) |
Cited By (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 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL6903512A (en) * | 1969-03-07 | 1970-09-09 | ||
| 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
Cited By (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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1321282C (en) | 2007-06-13 |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |