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:
Nov. 15, 1983
Filed:
Dec. 02, 1982
Leonard J Martini, San Diego, CA (US);
The United States of America as represented by the Secretary of the Navy, Washington, DC (US);
Abstract
A shaft seal is presented which combines the attributes of the low pressure ealing of an O-ring and the high pressure sealing of a carbon face seal. This invention provides a dynamic shaft seal with the advantage of a very reliable, positive elastomeric O-ring seal for low pressure sealing and the advantage of a reliable graphite face seal for high pressure sealing incorporated into an integral configuration. This integral configuration allows a smooth transition between the low pressure O-ring seal and the high pressure carbon face seal without leakage. Springs are designed to provide the correct preload compression on the dynamic O-ring seal and the forces required such that the transition operation occurs at the proper differential pressure. Mechanically, a rotating shaft within an aperture in a pressure housing wall is fitted with a sleeve containing a carbon face seal that mates against the face of an elastomeric/graphite-interface seal. The carbon face seal components are keyed to rotate with the shaft while the elastomeric/graphite-interface seal is keyed to the aperture and remains fixed in place during the shaft's rotation. The elastomeric/graphite-interface seal also houses an O-ring which provides a dynamic seal for the shaft at low pressure. Actuation of either the high pressure face type seal or the low pressure O-ring seal is adjustably controlled by compression springs in the mechanism.