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. 07, 2025
Filed:
Jan. 10, 2023
Pillar Corporation, Osaka, JP;
PILLAR CORPORATION, Osaka, JP;
Abstract
A mechanical seal device includes: a seal case surrounding a rotary shaft of a rotary machine and separating a machine inner area and a machine outer area of the rotary machine; a mechanical seal placed between the seal case and the rotary shaft; a sealing liquid chamber which is formed in the seal case and into which a sealing liquid for lubricating a sliding portion of the mechanical seal is introduced; and a circulation pump mechanism configured to circulate the sealing liquid in the sealing liquid chamber. The circulation pump mechanism includes: an annular rotor having a mounting groove open at an outer circumferential surface thereof; a vane provided in the mounting groove; a spring provided on a deep side with respect to the vane in the mounting groove; and a retaining member provided on the deep side with respect to the vane in the mounting groove.