Device and method for cooling and/or low-temperature liquefaction
US10393428B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 2014 |
| Grant date | Aug 27, 2019 |
| Priority date | — |
| Expiry date | Jun 19, 2036 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25J2270/912
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention relates to a device for cooling and/or liquefying, at a low-temperature, a working fluid containing helium or consisting of pure helium. The device includes a working circuit provided with a compressor station and a cold box. The compressor station includes one or more compression stages, each using one or more compressors that include a compressor wheel rigidly connected to an axle that is rotatably mounted on bearings. The axle of each compressor is rotated by an output shaft of a motor via a gear mechanism placed in a mechanical housing including lubricating oil. Said device is characterized in that the inner space of the mechanical housing contains a gaseous atmosphere consisting of a gaseous mixture having a mean molar mass that smaller than the molar mass of the air.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.