Dilution cryostat
US4672823A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 13, 1985 |
| Grant date | Jun 16, 1987 |
| Priority date | — |
| Expiry date | Dec 13, 2005 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25D2400/28
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A .sup.3 He-.sup.4 He dilution cryostat is provided in which a series of concentric dismountable enclosures permit ready disassembly for servicing and sample changing, and in which a secondary pumping circuit and a secondary cryogenic material delivery circuit provide rapid and convenient internal cooling of the dilution chamber by means of cooled cryogenic material, the dilution chamber being subsequently filled with the same cryogenic material in the liquified state. More particularly, the cryostat possesses a primary pumping circuit by which a .sup.3 He-.sup.4 He mixture is forced through cooling elements to liquify it, transferred into the dilution chamber and an associated evaporator, and the .sup.3 He finally recycled. A secondary pumping circuit includes a second evaporator connected to the dilution chamber, tubing connecting this evaporator with the tubing leading to the inlet side of a pump in the principal pumping circuit, and a valve located between the second evaporator and the tubing of the principal pumping circuit. A secondary cryogenic material delivery circuit includes heat exchanging elements connected in series between the pump of the principal pumping circuit an…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.