IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0349207
(2006-02-08)
|
등록번호 |
US-7497086
(2009-03-03)
|
우선권정보 |
GB-0505904.3(2005-03-23); GB-0515936.3(2005-08-03) |
발명자
/ 주소 |
- Atkins,Andrew Farquhar
- Gilgrass,Graham
- Stautner,Wolfgang
|
출원인 / 주소 |
- Siemens Magnet Technology Ltd.
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
6 인용 특허 :
13 |
초록
▼
The present provides a cryogenic thermal battery arrangement for maintaining a superconducting magnet coil or similar apparatus at cryogenic temperature for a required shipping period, such as thirty days, without consuming a significant amount of costly cryogen. According to another aspect, the inv
The present provides a cryogenic thermal battery arrangement for maintaining a superconducting magnet coil or similar apparatus at cryogenic temperature for a required shipping period, such as thirty days, without consuming a significant amount of costly cryogen. According to another aspect, the invention allows extended shipping periods without incurring excessive costs.
대표청구항
▼
The invention claimed is: 1. A thermal battery for maintaining an article at a cryogenic temperature for a required shipping period, by absorption of heat into the thermal battery, wherein the thermal battery comprises a first component and a second component, each in thermal contact with the artic
The invention claimed is: 1. A thermal battery for maintaining an article at a cryogenic temperature for a required shipping period, by absorption of heat into the thermal battery, wherein the thermal battery comprises a first component and a second component, each in thermal contact with the article, said first component comprising a first cryogen which serves to hold the article at a first temperature by boiling of the first cryogen, said second component comprising a second cryogen which is held at the first temperature by said boiling of the first cryogen, the second cryogen serving to hold the system at a second temperature, higher than the first temperature, after the first cryogen has boiled dry. 2. A thermal battery according to claim 1 wherein the first temperature is the boiling point of the first cryogen, and the second temperature is the boiling point of the second cryogen. 3. A thermal battery according to claim 1 wherein the first temperature is the boiling point of the first cryogen, and the second temperature is the melting point of the second cryogen. 4. A thermal battery according to claim 1 wherein the first temperature is the boiling point of the first cryogen, and the second temperature is a solid phase transition temperature of the second cryogen. 5. A thermal battery according to claim 1, wherein the thermal battery comprises a cryogen tank for holding the first cryogen and the second cryogen is accommodated within the cryogen tank, in contact with the first cryogen. 6. A thermal battery according to claim 1, wherein the thermal battery comprises a first cryogen tank for holding the first cryogen and a second cryogen tank for holding the second cryogen in thermal contact with a part of the article, such second cryogen tank being separate from the first cryogen tank. 7. A thermal battery according to claim 6, wherein the second cryogen tank is integrated within the part of the article. 8. A thermal battery according to claim 6 wherein the second cryogen tank is formed as a thermal shield, substantially enclosing a part of the article, thereby substantially blocking thermal radiation from reaching the part of the article. 9. A thermal battery according to claim 1, wherein the second component is formed by a tank containing the second cryogen, said tank being least partly filled with finned structures, a thermally conducting mesh or open-celled filler of thermally conductive material. 10. A thermal battery according to claim 1, arranged to cool a substantially cylindrical former for a solenoidal magnet, wherein the second component is formed by a tank containing the second cryogen, which is attached by an outer surface in thermal and mechanical attachment with the former, the former comprising an inner part of first diameter and at least one outer part of a second diameter, greater than the first diameter, wherein the tank is substantially toroidal or cylindrical in shape, and is coaxial with the former, the tank being substantially housed within a substantially cylindrical volume, said volume being coaxial with the former, and having an outer diameter equal to the second diameter, and an inner diameter equal to the first diameter. 11. A thermal battery according to claim 1, wherein the second cryogen substantially comprises nitrogen. 12. A magnetic resonance imaging (MRI) system, comprising superconducting coils wound around a thermally conductive former, said coils and said former being arranged to be cooled by a thermal battery according to claim 1. 13. A method for transporting apparatus at a cryogenic temperature, including the steps of: providing a second cryogen in a tank, in thermal connection with the apparatus; and adding a first cryogen, in thermal connection to the apparatus and the second cryogen, to maintain the apparatus and the second cryogen at a first cryogenic temperature by boiling of the first cryogen; maintaining the apparatus at the first cryogenic temperature until the first cryogen has boiled dry; and after the first cryogen has boiled dry, allowing the second cryogen to change phase, thereby maintaining the apparatus at a second cryogenic temperature, higher than said first cryogenic temperature, being a phase transition temperature of the second cryogen. 14. A method according to claim 13, further comprising the step of cooling the second cryogen by use of a closed loop refrigerator, prior to the addition of the first cryogen. 15. A method according to claim 13 wherein the phase transition is the boiling of the second cryogen. 16. A method according to claim 13 wherein the phase transition is the melting of the second cryogen. 17. A method according to claim 13 wherein the phase transition is a solid phase transition of the second cryogen.
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