Piston compressor for the oilfree compression of gases
US5347915A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 30, 1992 |
| Grant date | Sep 20, 1994 |
| Priority date | — |
| Expiry date | Sep 30, 2012 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF05C2225/04
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The piston (6) guided in a cylinder (1) has at least one split so-called trapped piston ring (10) disposed in an annular groove on the piston. The circumferential face (12) of the ring remote from the inner face (11) of the cylinder bounds in the annular groove a space (23) which is acted upon by the pressure of the gas in the compression space. Starting from this circumferential face (12) the piston ring exhibits two radial boundary areas (13, 14) parallel with one another, of which the area (14) next to the compression space extends over part of the radial width of the ring. The piston ring (10) is guided by its two parallel boundary areas (13, 14) to slide against corresponding areas in the annular groove. The remaining area (16) of the piston ring next to the compression space, starting from the circumferential face (15) next the inner face (11) of the cylinder, forms a wedge face which extends at an angle of from 5.degree. to 15.degree. up to a boundary area parallel with the boundary area (14) next to the compression space. The face in the annular groove adjacent to the wedge face (16) has the same angle and is parallel to the wedge face (16).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.