Modular, magnetically-coupled drive for a cryogenic refrigerator
US4044567A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 2, 1975 |
| Grant date | Aug 30, 1977 |
| Priority date | — |
| Expiry date | Sep 2, 1995 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02G2250/18
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An improved Vuilleumier cycle refrigerator is disclosed. To reduce fluid contamination and inactive refrigerant volume, the hot and cold fluid displacers of the refrigerator are driven by a magnetic drive mechanism. The magnetic drive mechanism has a first and second assembly. The first assembly is contained in the fluid chamber together with the hot and cold displacers; the second assembly including the drive motor is mounted exteriorly of the fluid chamber. The first and second assemblies of the drive mechanism include adjacent magnets separated by the wall of the fluid chamber. Thus, the first and second assemblies are coupled together by their magnetic field for rotation to drive the hot and cold displacers and the fluid chamber provides an hermetic seal to contain the working fluid thereby removing the motor with its air space and contaminants from the fluid chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.