US3725565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expansion member for superconducting cable
Assignee: Siemens AG
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Filing: 1972-04-21
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Granted: 1973-04-03
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Expires: 1992-04-21
Abstract
Abstract An expansion member for superconducting cable, designed to compensate for the expansion and contraction of the cable, having two corrugated tubes is arranged between the rigid tubes of the superconducting cable with transition sections connecting the corrugated tubes to the rigid tubes. The corrugated portions of the expansion member enables the expansion member to expand and contract. Bushings guide such expansion and there are stops provided to limit the amount of expansion. Wires or braids are provided to control the expansion.
Inventors
- 👤 F Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:04
CPC Classifications
H; H01; H01B; H01B12/00; Y; Y02; Y02E; Y02E40/00; Y02E40/60; Y10; Y10S; Y10S285/00; Y10S285/904; Y10S505/00; Y10S505/825; Y10S505/884
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
241 words
An expansion member for superconducting cables of the type having a rigid outer tube and a rigid inner tube disposed within the rigid outer tube, comprising: a. a corrugated outer tube of normally-conducting material; b. a corrugated inner tube of normally-conducting material which is disposed inside of the corrugated outer tube; c. two outer transition sections, one of which is disposed at each end of the corrugated outer tube, the rigid outer tube being connected to the outer transition sections; d. two inner transition sections, one of which is disposed at each end of the corrugated inner tube, the rigid inner tube being connected to the inner transition sections; e. superconducting layers which are applied as a coating to the outside surfaces of the rigid inner tube, the corrugated inner tube and the inner transition sections and to the inner surfaces of the rigid outer tube, the corrugated outer tube and the outer transition sections; f. guide elements holding said corrugated tubes centrically with respect to each other and to the axis of the cable; g. said two inner transition sections each have a flared portion which is conical in shape, the minimum diameter of the inner corrugated tube being greater than the minimum diameter of the rigid inner tube so that the magnetic field strength at the outer surface of the inner corrugated tube does not exceed the magnetic field strength at the outer surface of the rigid inner tube.
Claim 2
Dependent Claim
241 words
An expansion member for superconducting cables of the type having a rigid outer tube and a rigid inner tube disposed within the rigid outer tube, comprising: a. a corrugated outer tube of normally-conducting material; b. a corrugated inner tube of normally-conducting material which is disposed inside of the corrugated outer tube; c. two outer transition sections, one of which is disposed at each end of the corrugated outer tube, the rigid outer tube being connected to the outer transition sections; d. two inner transition sections, one of which is disposed at each end of the corrugated inner tube, the rigid inner tube being connected to the inner transition sections; e. superconducting layers which are applied as a coating to the outside surfaces of the rigid inner tube, the corrugated inner tube and the inner transition sections and to the inner surfaces of the rigid outer tube, the corrugated outer tube and the outer transition sections; f. guide elements holding said corrugated tubes centrically with respect to each other and to the axis of the cable; g. said two inner transition sections each have a flared portion which is conical in shape, the minimum diameter of the inner corrugated tube being greater than the minimum diameter of the rigid inner tube so that the magnetic field strength at the outer surface of the inner corrugated tube does not exceed the magnetic field strength at the outer surface of the rigid inner tube.
Claim 3
Dependent Claim
26 words
An expansion member for superconducting cables according to claim 1, wherein the two outer transition sections each have a flared portion which is conical in shape.
Claim 4
Dependent Claim
35 words
An expansion member for superconducting cables according to claim 2, wherein the minimum distance between the outer and inner corrugated tubes is at least equal to the distance between the outer and inner rigid tubes.
Claim 5
Dependent Claim
37 words
An expansion member for superconducting cables according to claim 1, wherein at the points where the rigid tubes are connected to the transition sections of the corrugated tubes the superconducting layers are thicker and are welded together.
Claim 6
Dependent Claim
83 words
An expansion member for superconducting cables according to claim 1, and further comprising an inner wire which is connected to the individual ribs of the corrugated inner tube and an outer wire which is connected to the individual ribs of the corrugated outer tube, the length of the wires being such that in the expanded configuration of the expansion member the wires force the individual ribs of each corrugated tube to have the same distance between adjacent ribs and thereby prevent local overstressing.
Claim 7
Dependent Claim
36 words
An expansion member for superconducting cables according to claim 1, wherein the guide elements comprise an outer bushing disposed outside of the outer corrugated tube and an inner bushing disposed inside of the inner corrugated tube.
Claim 8
Dependent Claim
73 words
An expansion member for superconducting cables according to claim 6, and further comprising stops at one end of the inner surface of the outer bushing, on the outer surface of one of the outer transition sections, at one end of the outer surface of the inner bushing and on the inner surface of one of the inner transition sections, said stops being for the purpose of limiting the expansion of the expansion member.
Claim 9
Dependent Claim
18 words
An expansion member for superconducting cables according to claim 1, wherein the corrugated tubes are made of copper.
Claim 10
Dependent Claim
18 words
An expansion member for superconducting cables according to claim 1, wherein the corrugated tubes are made of aluminum.
Claim 11
Dependent Claim
42 words
An expansion member for superconducting cables according to claim 1, wherein the guide elements comprise a spacer disposed between the corrugated outer tube and the corrugated inner tube, said spacer having a longitudinal canal to allow the passage of a cooling medium.
Claim 12
Dependent Claim
17 words
An expansion member for superconducting cables according to claim 10, wherein the spacer is made of plastic.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |