TOP > 外国特許検索 > Circulation-type liquid helium reliquefaction apparatus with contaminant discharge function, method of discharging contaminant from the apparatus, and refiner and transfer tube both of which are used for the apparatus

Circulation-type liquid helium reliquefaction apparatus with contaminant discharge function, method of discharging contaminant from the apparatus, and refiner and transfer tube both of which are used for the apparatus

外国特許コード F110003141
整理番号 A091-09US
掲載日 2011年6月15日
出願国 アメリカ合衆国
出願番号 54410003
公報番号 20060230766
公報番号 7565809
出願日 平成15年9月18日(2003.9.18)
公報発行日 平成18年10月19日(2006.10.19)
公報発行日 平成21年7月28日(2009.7.28)
国際出願番号 JP2003011886
国際公開番号 WO2004070296
国際出願日 平成15年9月18日(2003.9.18)
国際公開日 平成16年8月19日(2004.8.19)
優先権データ
  • 特願2003-025525 (2003.2.3) JP
  • 2003WO-JP11886 (2003.9.18) WO
発明の名称 (英語) Circulation-type liquid helium reliquefaction apparatus with contaminant discharge function, method of discharging contaminant from the apparatus, and refiner and transfer tube both of which are used for the apparatus
発明の概要(英語) (US7565809)
This invention relates to a circulation type liquid helium recondensation device with a contaminant-purging function capable of vaporizing and removing contaminants deposited on the refiner in the device.
Helium gas vaporizing in the liquid helium storage tank 2 is pumped by the circulating pump 7 and refined in the refiner 6.
The refiner is provided with heaters and also a discharge circuit on the inflow side.
The vaporized contaminants generated when the refiner 6 is heated by the heaters are pumped by the circulating pump 7 or the dedicated purge pump 8 and vented to the atmosphere via said discharge circuit.
特許請求の範囲(英語) [claim1]
1. A circulation type liquid helium recondensation device with a contaminant-purging function comprising: a pump which pumps helium gas evaporating from a liquid helium storage tank a refiner connected to the liquid helium storage tank through a first passage, which refines the pumped helium gas; a condensing pot connected to the refiner through a second passage, which liquefies the gas; and a third passage though which the liquefied helium is returned to the liquid helium storage tank; and a discharge circuit connected to the first passage between the refiner and the liquid helium storage tank, wherein the pump is connected to the discharge circuit through a normally closed valve, wherein a heater is provided in the refiner, wherein in a contaminant discharge operation, the normally closed valve is opened and contaminants that vaporize by heating the refiner by the heater are pumped by the pump and discharged to the atmosphere via said discharge circuit.
[claim2]
2. A circulation type liquid helium recondensation device with a contaminant-purging function as claimed in claim 1 in which a dedicated purge pump is installed in said discharge circuit to pump and discharge vaporized contaminants to the atmosphere.
[claim3]
3. A circulation type liquid helium recondensation device with a contaminant-purging function as claimed in claim 2 in which mass flow controllers are installed on the inflow side of said refiners to control the flow rate of the incoming helium gas.
[claim4]
4. A circulation type liquid helium recondensation device with a contaminant-purging function as claimed in claim 2 in which two or more valves are installed on the inflow side of the refiner to control the flow rate of the incoming helium gas by combining said valves.
[claim5]
5. A circulation type liquid helium recondensation device with a contaminant-purging function as claimed in claim 1 in which said discharge circuit is a circuit connecting the inflow side circuit of the refiner and the inflow valve of said circulating pump, and an electromagnetic valve for discharge is installed in said discharge circuit, and another electromagnetic valve for atmospheric discharge is installed on the downstream side of said circulating pump.
[claim6]
6. A circulation type liquid helium recondensation device with a contaminant-purging function as claimed in any of claims 1 through 5 in which the condensing pot is installed to store the refined helium from the refiner as gas or liquid at near-4K temperature, and said condensing pots are provided with heaters.
[claim7]
7. A circulation type liquid helium recondensation device with a contaminant-purging function as claimed in any of claims 1 through 5 in which said liquid helium storage tank is provided with an electromagnetic valve to regulate the pressure of the liquid helium storage tank.
[claim8]
8. A contaminant-purging method for the circulation type liquid helium recondensation device that is employed in liquid helium recondensation procedure comprising steps of pumping helium gas evaporating from a liquid helium storage tank using a circulating pump, refining the pumped helium gas in a refiner, liquefying the gas in a cooler, and returning the liquefied helium to the liquid helium storage tank for recycling, in which said refiner is heated to vaporize contaminants deposited on the refiner, and discharging the vaporized contaminants from an inflow side of the refiner to the atmosphere.
[claim9]
9. A contaminant-purging method for the circulation type liquid helium recondensation device that is employed in a liquid helium recondensation procedure comprising steps of pumping helium gas evaporating from a liquid helium storage tank using a circulating pump, refining the pumped helium gas in a refiner, liquefying the gas in a cooler, storing the liquefied helium in a condensing pot, and transferring the liquid helium from said condensing pot to the liquid helium storage tank for recycling, in which at least either of said condensing pot or said refiner is heated to vaporize the contaminants deposited on the refiner, and the vaporized contaminants are discharged from an inflow side of the refiner to the atmosphere.
[claim10]
10. A contaminant-purging method for the circulation type liquid helium recondensation device as claimed in claim 8 or 9 in which said vaporized contaminants are pumped by a dedicated pump and discharged to the atmosphere.
[claim11]
11. A contaminant-purging method for the circulation type liquid helium recondensation device as claimed in claim 8 or 9 in which said vaporized contaminants are pumped by the circulating pump and discharged to the atmosphere.
[claim12]
12. A contaminant-purging method for the circulation type liquid helium recondensation device as claimed in claim 9 in which heating of said condensing pot or the refiner starts when the pressure in the refiner rises to a preset level and stops when the pressure falls to a preset level.
[claim13]
13. A contaminant-purging method for the circulation type liquid helium recondensation device as claimed in claim 9 in which heating of said condensing pot or the refiner starts when the flow velocity in the refiner falls to a preset level and stops when the flow velocity rises to a preset level.
[claim14]
14. A contaminant-purging method for the circulation type liquid helium recondensation device as claimed in claim 9 in which heating and cooling of said condensing pot or the refiner is performed in the operating mode sequence of heating/back-flow, cooling, circulation recovery, and liquid level recovery.
[claim15]
15. A refiner for a circulation type liquid helium recondensation device with a contaminant-purging function designed to pump helium gas evaporating from a liquid helium storage tank using a circulating pump, refine the pumped helium gas in the refiner, liquefy the gas in a condensing pot, and return the liquefied helium to the liquid helium storage tank for recycling, in which said refiner is made up of a thermally conductive housing, with contaminant solidification unit installed on the housing, an infeed means to transfer helium gas to said housing, and a heating means to vaporize the contaminants attached to said solidification unit, and in which the contaminants vaporized in the refiner by said heating means are discharged from an inflow side of the refiner to the atmosphere via said infeed means.
[claim16]
16. A refiner for the circulation type liquid helium recondensation device with a contaminant-purging function as claimed in claim 15 in which said contaminant solidification unit is a staggered zigzag passage made up of thermally conductive fins.
[claim17]
17. A refiner for the circulation type liquid helium recondensation device with a contaminant-purging function as claimed in claim 15 or 16 in which said infeed means is supported on the housing via a component that reduces the thermal gradient.
[claim18]
18. A helium gas refiner as claimed in claim 17 in which said component to reduce the thermal gradient is a stainless steel bellows component.
[claim19]
19. A circulation type liquid helium recondensation device with a contaminant-purging function as claimed in claim 6 in which said liquid helium storage tank is provided with an electromagnetic valve to regulate the pressure of the liquid helium storage tank.
[claim20]
20. A contaminant-purging method for the circulation type liquid helium recondensation device as claimed in claim 10 in which heating of said condensing pot or the refiner starts when the pressure in the refiner rises to a preset level and stops when the pressure falls to a preset level.
[claim21]
21. A contaminant-purging method for the circulation type liquid helium recondensation device as claimed in claim 11 in which heating of said condensing pot or the refiner starts when the pressure in the refiner rises to a preset level and stops when the pressure falls to a preset level.
[claim22]
22. A contaminant-purging method for the circulation type liquid helium recondensation device as claimed in claim 10 in which heating of said condensing pot or the refiner starts when the flow velocity in the refiner falls to a preset level and stops when the flow velocity rises to a preset level.
[claim23]
23. A contaminant-purging method for the circulation type liquid helium recondensation device as claimed in claim 11 in which heating of said condensing pot or the refiner starts when the flow velocity in the refiner falls to a preset level and stops when the flow velocity rises to a preset level.
[claim24]
24. A contaminant-purging method for the circulation type liquid helium recondensation device as claimed in claim 10 in which heating and cooling of said condensing pot or the refiner is performed in the operating mode sequence of heating/back-flow, cooling, circulation recovery, and liquid level recovery.
[claim25]
25. A contaminant-purging method for the circulation type liquid helium recondensation device as claimed in claim 11 in which heating and cooling of said condensing pot or the refiner is performed in the operating mode sequence of heating/back-flow, cooling, circulation recovery, and liquid level recovery.
[claim26]
26. A contaminant-purging method for the circulation type liquid helium recondensation device as claimed in claim 12 in which heating and cooling of said condensing pot or the refiner is performed in the operating mode sequence of heating/back-flow, cooling, circulation recovery, and liquid level recovery.
[claim27]
27. A contaminant-purging method for the circulation type liquid helium recondensation device as claimed in claim 13 in which heating and cooling of said condensing pot or the refiner is performed in the operating mode sequence of heating/back-flow, cooling, circulation recovery, and liquid level recovery.
[claim28]
28. A circulation type liquid helium recondensation device with a contaminant-purging function designed to pump helium gas evaporating from a liquid helium storage tank using a circulating pump, to refine the pumped helium gas in refiners, to liquefy the gas in a condensing pot, and to return the liquefied helium to the liquid helium storage tank for recycling, in which said refiners are provided with a first heater and also a discharge circuit on the inflow side, said condensing pot is provided with a second heater, and contaminants that vaporize when the refiners and said condensing pot are heated by said first and second heaters are pumped and discharged to the atmosphere via said discharge circuit.
[claim29]
29. The circulation type liquid helium recondensation device with a contaminant-purging function as claimed in claim 1, wherein the refiner and the cooler are provided in a single cold box.
[claim30]
30. The contaminant-purging method for the circulation type liquid helium recondensation device as claimed in claim 8, wherein the refiner and the cooler are provided in a cool box.
[claim31]
31. The contaminant-purging method for the circulation type liquid helium recondensation device as claimed in claim 9, wherein the refiner and the cooler are provided in a cool box.
[claim32]
32. The contaminant-purging method for the circulation type liquid helium recondensation device as claimed in claim 15, wherein the refiner and the condensing pot are provided in a single cool box.
[claim33]
33. The circulation type liquid helium recondensation device with a contaminant-purging function as claimed in claim 1, wherein a flow control valve is provided in an inflow side of the refiner and between the discharge circuit and liquid helium storage tank.
  • 発明者/出願人(英語)
  • TAKEDA TSUNEHIRO
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
国際特許分類(IPC)
参考情報 (研究プロジェクト等) CREST Creating the Brain AREA
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