Liquid helium pump
US4365942A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 15, 1980 |
| Grant date | Dec 28, 1982 |
| Priority date | — |
| Expiry date | Dec 15, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S505/91
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A pump includes a pump housing defining a pumping chamber and having two opposite end walls and a piston arranged in the pumping chamber for alternating motion towards and away from the end walls for drawing a cryogenic liquid into and driving it out of the pumping chamber. There are further provided first and second superconducting energizing coils mounted on respective end walls for generating a radial electromagnetic field in the pumping chamber. The energizing coils are coaxial with the piston axis. A superconducting control coil is fixedly mounted on the piston for generating a further magnetic field in the pumping chamber. The control coil is coaxial with the piston axis. The energizing coils and the control coil form part of an electromagnetic drive for generating, in the pumping chamber, an electromagnetic force which propels the piston back and forth between the end walls. Further, a bellows is affixed to peripheral regions of the piston and to the end walls for enclosing the pumping chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.