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:
Oct. 04, 1994
Filed:
Nov. 16, 1992
Kenneth H Wenzel, Edmonton, CA;
Dean Foote, Edmonton, CA;
Vector Oil Tool Ltd., , CA;
Abstract
A flow restrictor for a mud lubricated earth drilling motor consisting of a first seal support non-rotatably coupled to an outer housing and a second seal support non-rotatably coupled to an inner tubular member which is telescopically received within the outer housing. The first seal support having a first seal face and the second seal support having a second seal face. The first seal support and the second seal support are axially movable. A plurality of springs engage the first seal support to exert a biasing force bringing the first seal face into sealing engagement with the second seal face to form a mechanical seal, having a first side adjacent the outer housing and a second side adjacent the inner tubular member. A first fluid flow passage extends from the interior drilling mud flow passage of the inner tubular member the first side of the mechanical seal. A second fluid flow passage extends from the second side of the mechanical seal to exterior of the outer housing. At least one groove is provided across the first seal face and the second seal face, extending from the first side to the second side of the mechanical seal, such that a continuous flow of drilling mud passes through the groove and is vented to the exterior of the outer housing via the second fluid flow passage.