Cryogenic refrigerator
US4840043A · kind A · utility
Inventors
Key dates
| Filing date | May 18, 1987 |
| Grant date | Jun 20, 1989 |
| Priority date | — |
| Expiry date | May 18, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25B9/10
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
In a cryogenic refrigerator having a precooling refrigerating circuit including a cryostat for cooling and maintaining a cryogenic working apparatus which is operated at a very low temperature level, an expander for expanding refrigerant gas, such as helium gas, and a J-T circuit for generating cold by Joule-Thomson expanding refrigerant gas precooled by the precooling refrigerating circuit, the present invention prevents the working vibration of the expander from unduly effecting the cryogenic working apparatus and to maintain the cryogenic working apparatus at a very low temperature level for many hours, even while the precooling refrigerating circuit is stopped thereby enabling a stabilized operation of the cryogenic working apparatus to be performed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.