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. 27, 1990
Filed:
Nov. 01, 1988
Abraham Lipschitz, Warwick, RI (US);
EG&G Sealol, Inc., Providence, RI (US);
Abstract
A seal assembly between a rotatable hollow outer shaft and a rotatable inner shaft for sealing a high pressure fluid reservoir from a low pressure fluid reservoir. Axially spaced radially extending first and second runners are attached to the inner shaft. An annular seal ring surrounds and is radially spaced from the inner shaft and disposed between the runners. Fluid flow from the high pressure reservoir to the low pressure reservoir in a path defined by spaces formed between the seal ring and the shafts and runners, and axially through passages in the seal ring. The hydrostatic forces imposed on the seal ring tend to maintain it in its proper position. Radially extending grooves are machined in the opposed surfaces of the runners generating a hydrodynamic lift force between the seal ring and runners proportionate to relative rotation between the shafts, for axially sliding the seal ring relative to the outer shaft in response to relative axial movement between the shafts and for maintaining the flow of fluid and preventing rubbing contact between the seal ring and the runners.