Sealing structure for reciprocating pistons exposed to high pressure differentials
US4304410A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 20, 1979 |
| Grant date | Dec 8, 1981 |
| Priority date | — |
| Expiry date | Sep 20, 1999 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16J15/44
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
This invention effects a significant reduction in leakage along a piston reciprocating in a cylinder and having a high fluid pressure differential existing between one end of the piston and the other. A large number of closely spaced, annular grooves are provided on the periphery of the piston and the clearance between the non-grooved piston diameter and the interior wall of the cylinder is maintained at a value significantly larger than that commonly employed between a smooth cylindrical shaft and a cylindrical interior sealing surface. The employment of such unexpectedly large clearance not only provides reduced fluid leakage for lighter density fluids when the equipment is relatively new, but the leakage becomes substantially less than that encountered in a smooth surface bearing construction as the piston and cylinder surfaces wear and increase the clearance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.