Static pressure non-contact gas seal
US6135458A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 28, 1999 |
| Grant date | Oct 24, 2000 |
| Priority date | — |
| Expiry date | Jun 28, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16J15/3448
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A static pressure-type generating non-contact gas seal in which a diameter d2 of a second outer circumferential portion (42) of a stationary seal ring (4) in contact with a second O-ring (62) is made smaller than the diameter d1 of a first outer circumferential portion (41) of the stationary seal ring (4) in contact with a first O-ring (62). Because of d1>d2, the pressure of a seal gas (8) led to a first closed space (71) produces a force thrusting the stationary seal ring (4) toward a rotary seal ring (2). A second closed space (72) communicates with an inside region (F) through a back pressure lead-in path (45). The inside gas pressure in the second closed space (72) acts as back pressure on the stationary seal ring (4). The groove width b of static pressure generating grooves (9) formed on the seal end face of the stationary seal ring (4) is decided so that a ratio of the groove width d to the radial width, that is, the seal face width B of the stationary seal ring end face (40), i.e. b/B, is 0.05.ltoreq.b/B.ltoreq.0.03. The radial distance Bo from the outer edge of the seal end face (40) of the stationary seal ring to the static pressure generating groove (9) or the radial dist…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.