US4543794A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Superconducting magnet device
Assignee: Toshiba Corp
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Filing: 1984-07-19
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Granted: 1985-10-01
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Expires: 2004-07-19
Abstract
Abstract A cold insulation vessel comprises an inner chamber in which cryogen is enclosed, an outer chamber to enclose this inner chamber and a shield member against heat radiation which is provided between the inner chamber and the outer chamber. This vessel is provided to hold a superconducting coil which is enclosed in the inner chamber at a very low temperature. A power lead is provided to supply an exciting current to this superconducting coil. A recondenser is provided to recondense the evaporated gas of the cryogen in the inner chamber. The small refrigerator means has a plurality of refrigeration stages which are directly coupled to the power lead and the recondenser.
Inventors
- 👤 Kinya Matsutani
- 👤 Katutoki Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:23
CPC Classifications
H; H01; H01F; H01F6/00; H01F6/06; H01F6/065; F; F25; F25D; F25D19/00; F25B; F25B9/00; F25B9/10; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/888; Y10S505/892
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
139 words
A superconducting magnet device comprising: a cold insulation vessel which is composed of an inner chamber in which cryogen is sealed, and outer chamber for enclosing said inner chamber and a shield member for heat radiation which is provided between said inner chamber and said outer chamber, said vessel holding a superconducting coil which is enclosed in said inner chamber at a very low temperature; a power lead for supplying an exciting current to said superconducting coil; a recondenser for recondensing the evaporated gas of the cryogen in said inner chamber; small refrigerator means having a plurality of refrigeration stages which are directly and respectively coupled to said power lead and said recondenser; and control means for controlling the refrigerating capability of said small refrigerator means in accordance with the quantity of heat penetrating into said add insulation vessel.
Claim 2
Dependent Claim
139 words
A superconducting magnet device comprising: a cold insulation vessel which is composed of an inner chamber in which cryogen is sealed, and outer chamber for enclosing said inner chamber and a shield member for heat radiation which is provided between said inner chamber and said outer chamber, said vessel holding a superconducting coil which is enclosed in said inner chamber at a very low temperature; a power lead for supplying an exciting current to said superconducting coil; a recondenser for recondensing the evaporated gas of the cryogen in said inner chamber; small refrigerator means having a plurality of refrigeration stages which are directly and respectively coupled to said power lead and said recondenser; and control means for controlling the refrigerating capability of said small refrigerator means in accordance with the quantity of heat penetrating into said add insulation vessel.
Claim 3
Dependent Claim
34 words
A device according to claim 1, wherein the conduction cross-sectional areas and the conduction lengths of said power lead among said refrigeration stages are set such that the quantity of penetration heat becomes minimum.
Claim 4
Dependent Claim
19 words
A device according to claim 1, wherein said small refrigerator means is directly attached to said cold insulation vessel.
Claim 5
Dependent Claim
25 words
A device according to claim 1, wherein said small refrigerator means includes a refrigeration stage which is directly coupled to said thermal radiation shield member.
Claim 6
Dependent Claim
36 words
A device according to claim 1, wherein said small refrigerator means includes first and second small refrigerators each having a plurality of refrigeration stages which are respectively directly coupled to said power lead and said recondenser.
Claim 7
Dependent Claim
36 words
A device according to claim 1, wherein said small refrigerator means includes a single small refrigerator having a plurality of refrigeration stages, which is partially directly commonly coupled to said power lead and to said recondenser.
Claim 8
Dependent Claim
32 words
A device according to claim 1, wherein said control means has rotating speed control means for controlling the rotating speed of a motor to drive a compressor of said small refrigerator means.
Claim 9
Dependent Claim
33 words
A device according to claim 1, wherein said control means has cryogen flow rate control means for controlling the discharge flow rate of the refrigerant from a compressor of said small refrigerator means.
Claim 10
Dependent Claim
43 words
A device according to claim 1, wherein said control means has cryogen pressure control means for controlling the pressure of the cryogen in a compressor of said small refrigerator means in a J - T piping system which is connected to said compressor.
Claim 11
Dependent Claim
26 words
A device according to claim 1, wherein said control means includes a means for opening and closing an automatic valve for bursting in said inner chamber.
Claim 12
Dependent Claim
28 words
A device according to claim 1, wherein said control means includes a means for compensating the deterioration of the refrigerating capability of said small refrigerator means with time.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-30 | 1989-04-01 | 1989-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-30 | 1993-04-01 | 1993-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-30 | 1997-04-01 | 1997-10-01 | $7700.00 | Window Closed / Lapsed |