Patent ID: 8231130
Filing Date: 2012-07-31
Classification: F16J

Abstract:
1. A mechanical seal device disposed in an outboard side relative to an external surface of an end portion of a bore diameter surface in a seal housing for sealing a sealed fluid between said seal housing installing a shaft within said bore diameter surface and said shaft, said mechanical seal device comprising: a seal cover being attachable to said external surface of said seal housing and retaining an inner circumferential surface surrounding said shaft, a fit engagement surface being formed on said inner circumferential surface, an annular groove configured to be larger than said fit engagement surface and being formed on said inner circumferential surface, and a flange portion extending radially inward in a surrounding relation relative to said shaft at said seal housing side; a bellows having a first mounting portion and a second mounting portion, wherein a cylindrical portion between said first mounting portion and said second mounting portion forms a resilient urging means; a case retaining a coupling portion which is formed on an inner circumference thereof and which couples with said first mounting portion and a lock engagement surface which is formed on an outer circumference thereof and which couples with said fit engagement surface of said seal cover in a freely detachable manner along an axial direction of said shaft, and houses an outer circumferential surface of said bellows; a stationary seal ring being sealingly mounted to the circumferential surface of said second mounting portion of said bellows and having a ring formed seal surface, said seal surface being urged by the resilient urging means of said bellows; a rotary seal ring having a ring formed opposing seal surface, said opposing seal surface opposing and forming a seal tight contact with said seal surface in a slidable manner; and a seal collar fitting and being coupled with said rotary seal ring in a sealing relation and being fittingly fixed with said shaft in a sealing relation, wherein said seal cover is provided with a flushing passage configured to supply flushing fluid and a quenching passage configured to supply quenching fluid, a passageway defined between said flange portion and a said first mounting portion, and which communicates with a said flushing passage, and a fluid chamber (C) is defined between said annular groove of said seal cover, said stationary seal ring, and said rotary seal ring, and which communicates with said quenching passage.