Cryogenic piston ring improvement
US11326694B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 15, 2020 |
| Grant date | May 10, 2022 |
| Priority date | — |
| Expiry date | Dec 15, 2040 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16J9/18
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A piston ring set of a cryogenic pump includes a first piston ring and a second piston ring which are dissimilarly shaped and cooperatively shaped to form a hollow cylindrical shape when in abutment to one another. The first piston ring is C-shaped and defines a middle portion disposed between a first end portion and a second end portion. A piston ring gap is disposed between a first distal end of the first end portion and a second distal end of the second end portion. When the first piston ring is in abutment with the second piston ring forming the hollow cylindrical shape, the second piston ring does not extend along the middle portion of the first piston ring while the second piston ring does extend along the first end portion and second end portion of the first piston ring.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.