Method and dilution refrigerator for cooling at temperatures below 1.degree. K.
US4499737A · kind A · utility
14Cited by
11References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 7, 1983 |
| Grant date | Feb 19, 1985 |
| Priority date | — |
| Expiry date | Mar 7, 2003 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25B9/12
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The dilution refrigerator operates by sucking a .sup.4 He-rich mixture from a tank and returning it to the tank through a superleak. Thereby the .sup.3 He is separated and returned to the .sup.3 He-rich content of the tank. By this cycling process, a drop in temperature is obtained at the exit of the superleak and through re-mixing of the .sup.3 He with the .sup.4 He. Cycling of the liquid .sup.3 He-.sup.4 He mixture is performed by a bellows pump maintained in a container 16 at a temperature below 2.degree. K. and by specially designed valves comprising a steel ball as a plug and a gold ring as the valve seat.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.