Patent ID: 9568108
Date: 2017-02-14
CPC Classifications: F16J

Claim:
1. A bellows type mechanical seal providing sealing between a rotating shaft and a housing, the bellows type mechanical seal comprising: a seal ring, and a mating ring that is arranged in opposition to said seal ring so as to be in sliding contact therewith, wherein one of said seal ring and said mating ring is supported by said housing, and the other thereof is supported on said rotating shaft so as to rotate together with said rotating shaft, wherein said seal ring is supported through a bellows having two ends, and said bellows is constructed as a bellows assembly of an integral structure in which a retainer for holding said seal ring is welded and fixed to one of the ends of said bellows and a collar is welded and fixed to the other of the ends of said bellows, and wherein the bellows assembly, after said bellows, said retainer and said collar are welded to one another, is covered with an anti-corrosion coating film formed by means of a physical vapor deposition method, and the bellows assembly only has a single anti-corrosion coating film that comprises a single layer of material, with the anti-corrosion coating film disposed over every surface of the bellows assembly.