Mechanism for forming a seal around the shaft of a liquid pump
US6098988A · kind A · utility
2Cited by
6References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 9, 1998 |
| Grant date | Aug 8, 2000 |
| Priority date | — |
| Expiry date | Apr 9, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S277/938
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A mechanism for forming a liquid-tight seal around the rotary shaft of a liquid pump having a stationary ring attached to the casing of the pump and a rotating ring attached to the rotary shaft and contacting the stationary ring. The stationary ring is formed from baked carbon, while the rotating ring is a sintered product of silicon nitride. The stationary ring has an effective seal width ratio, rp/Di, of 0.07/1 to 0.22/1, where rp is the width of the effective seal surface of the stationary ring and Di is its inside diameter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.