Cryogenic pump with a device for preventing the memory effect
US8955339B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 25, 2011 |
| Grant date | Feb 17, 2015 |
| Priority date | — |
| Expiry date | Dec 9, 2031 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B37/08
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The invention relates to a device (21) for avoiding the memory effect in cryogenic pumps having a first cooling stage (23) and a second cooling stage (25) which adjoins the first cooling stage (23) in the axial direction. A cylindrical shield (31) has an opening (37) and a base (35), which base (35) is penetrated centrally by the two-stage cooling head (21) in such a way that the first cooling stage (23) is arranged outside the shield (31) and the second cooling stage (25) is arranged within the shield (31). An intermediate chamber (34) is formed between the shield (31) and the first cooling stage (23), and the base of the shield (31) is connected in a thermally conductive manner to the first cooling stage (23) by means of a thermal bridge (33). A cooling panel (43) which serves as pumping surface is connected to the second cooling stage (25) and is provided within the shield (31). A baffle (39) is arranged in the region of the opening (37) of the cylindrical shield (31) and is in thermally conductive contact with the shield (31) and/or the first cooling stage (21). The thermal bridge (33) is provided between the shield (31) and the first cooling stage (23) at a spacing from its en…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.