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. 16, 2025
Filed:
Jan. 10, 2023
Pillar Corporation, Osaka, JP;
PILLAR CORPORATION, Osaka, JP;
Abstract
A circulation pump mechanism of a mechanical seal device includes a rotor having mounting grooves formed therein, vanes provided in the mounting grooves, a plurality of biasing members provided in a space on a deep side with respect to the vane in each mounting groove and configured to bias each vane in a direction in which the vane is caused to project, a housing having an inner circumferential surface which is eccentric with respect to an outer circumferential surface of the rotor and on which a tip of each vane slides, a pump chamber demarcated on a leading side in a rotation direction of the rotor with respect to the tip of each vane between the outer circumferential surface of the rotor and the inner circumferential surface of the housing, and a communication flow path formed in the rotor and providing communication between the space and the pump chamber.