The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 09, 1997
Filed:
Feb. 23, 1996
Toshihiko Fuse, Sanda, JP;
Eiji Okumachi, Sanda, JP;
Nippon Pillar Packing Co., Ltd., Osaka, JP;
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.