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, 1983
Filed:
Jan. 18, 1982
Izhak Etsion, Haifa, IL;
Technion Research & Development Foundation Ltd., Haifa, IL;
Abstract
A hydrodynamic, non-contacting end-face seal for a rotary machine comprises a rotor mounted on the machine shaft and a ring-shaped stator facing the flat and smooth surface of the rotor at a short distance. The stator encloses the machine shaft, is eccentrically positioned in respect of the rotor center, and is urged towards the rotor surface by a helical spring. The surface of the stator ring is shaped to form a circular rim separated from the rotor surface by a very small gap of varying width, and the space enclosed by this rim is raised to a higher pressure than the surroundings by the hydrodynamic action of the surface velocity of the rotor on the liquid in the machine, by making the gap width as follows: the gap width between rotor and stator is of a mechanically permissible minimum in all points of the rim at which the velocity vector of the rotor surface extends from the inside of the rim to the outside, and the gap width is larger in all points of the rim at which the velocity vector extends from the outside to the inside. The gap width is changed, in accordance with pressure conditions in the machine by action of the helical sprin