Mechanical face seal with a reverse trapezoidal face pattern
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United States of America Patent
Stats
-
Feb 21, 2017
Grant Date -
Jul 24, 2014
app pub date -
Jan 23, 2014
filing date -
Jan 23, 2013
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An improved mechanical face seal is provided which includes a pair of relatively rotatable seal rings having opposing seal faces. At least one of the seal faces includes a reverse trapezoidal face pattern having a sine wave depth profile wherein individual face features are circumferentially spaced over the seal face. The reverse trapezoidal face pattern serves to generate a hydrodynamic lift which provides a stable separation of the seal faces that permits formation of a fluid film between the seal faces. The individual trapezoidal grooves have a sinusoidal or similarly shaped depth profile wherein the trapezoid shape is arranged with the narrower edge communicating with the high pressure side of the seal, and the wider edge forms a circumferential dam region towards the low pressure side of the seal. Alternatively, the reverse trapezoidal face pattern may also be provided as a primary face pattern on a dry gas seal in combination with a secondary face pattern wherein the faces operate with a controlled gap under normal pressure conditions as well as when the pressure direction across the seal face is reversed.
First Claim
Other Claims data not available
Family
International Classification(s)
- 2014 Application Filing Year
- F16J Class
- 613 Applications Filed
- 500 Patents Issued To-Date
- 81.57 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 10 Citation Count
- F16J Class
- 33.33 % this patent is cited more than
- 8 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Aug 21, 2028 |
