Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent
1996-02-23
1997-09-09
DePumpo, Daniel G.
Seal for a joint or juncture
Seal between relatively movable parts
Relatively rotatable radially extending sealing face member
277 81R, F16J 1534
Patent
active
056647875
ABSTRACT:
A non-contacting shaft sealing device comprises an even number of dynamic pressure generating grooves arranged in the peripheral direction on a sealing end face of either the seal case side or the rotary shaft side. Each dynamic pressure generating groove comprises a shallow L-shaped groove of a specific groove width and depth and includes a fluid lead in part extending in the radial direction from a peripheral edge of the high pressure side of the sealing end face and a dynamic pressure generating part extending in the peripheral direction from the end portion thereof. Each groove is symmetrical with respect to one adjacent groove on one side thereof around a first sealing end face diametral line passing between adjacent fluid lead-in parts or symmetrical with respect to a second groove on the other side around a second sealing end face diametral line passing between the dynamic pressure generating grooves. The groove land ratio .theta..sub.1 /.theta..sub.2 in the peripheral direction is 0.5 to 0.9 wherein the angle of intersection .theta..sub.1 is the angle between a third sealing end face diametral line running along the fluid lead-in part of the dynamic pressure generating groove and a fourth sealing end face diametral line on which the end portion of the dynamic pressure generating part is positioned, while the angle .theta..sub.2 is the angle between the fourth sealing end face diametral line and the third sealing end face diametral line.
REFERENCES:
patent: 5066026 (1991-11-01), Heck et al.
patent: 5092612 (1992-03-01), Victor et al.
Fuse Toshihiko
Okumachi Eiji
DePumpo Daniel G.
Nippon Pillar Packing Co. Ltd.
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