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:
Dec. 04, 2001
Filed:
May. 22, 2000
Yasutaka Iwamoto, Osaka, JP;
Masaaki Furuya, Tokyo, JP;
Masahito Ikehara, Tokyo, JP;
Yoshimitsu Sekiya, Tokyo, JP;
Other;
Abstract
A static pressure non-contact type mechanical seal that exhibits and maintains a high sealing function or performance for a prolonged period even when sealing gases containing foreign matter such as oil. A labyrinth seal (,) comprising a plurality of annular grooves (,) and annular plates (,) extending into the grooves is provided, the labyrinth seal partitioning a region C on the outside diameter side of the seal faces (,) in the seal case (,) from the inside region A of a gas treatment machine (,). The seal case is provided with a return passage (,) communicating with the bottom portions of the annular grooves,and opening into the inside region A of the machine. The seal case also includes a purge gas feed passage for supplying purge gas to the region C on the outside diameter side of the seal faces, the purge gas pressure being higher than that in the inside region. A foreign matter recovery passage (,) is also provided in the seal case, the recovery passage opening into the region C on the outside diameter side of the seal faces and communicating with a foreign matter recovery tank (,) maintained under the same pressure as the region C.