BELLOWS TYPE MECHANICAL SEAL

摘要

A bellows type mechanical seal including a sealing ring and a mating ring, wherein either one of the sealing ring or the mating ring is retained in a housing and the other one is mounted on a shaft and wherein the sealing ring is supported by a bellows and the bellows has a retainer welded thereto on one of the sides for retaining the sealing ring and a collar welded on the other side to form a bellows assembly, is characterized in that the entire surface of the bellows assembly is covered by an erosion-resistant film formed by the physical vapor deposition, such as ion-plating.

主权项

1. A bellows type mechanical seal which is a mechanical seal for providing sealing between a rotating shaft and a housing, 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, 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 end of said bellows and a collar is welded and fixed to the other end 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.