Patent ID: 7878509
Filing Date: 2011-02-01
Classification: F16J

Abstract:
1. A mechanical seal device for being provided in an apparatus main body mounting a shaft therethrough for effecting a seal on a circumference of said shaft, said mechanical seal device comprising: a) a seal cover being mounted on an outboard surface of said apparatus main body and having a fit surface to which said shaft is inserted and defining a cavity portion in an outboard side relative to said fit surface; b) a quenching passage communicating with said cavity portion and feeding a quenching fluid to within said cavity portion; c) a reducing face being disposed on said seal cover and being arranged in an annular form, said reducing face being located in said outboard side relative to said cavity portion; d) a first seal ring retaining a moveable face and a seal face, said moveable face being sealingly fitted with said fit surface of said seal cover in freely moveable a manner, said seal face being located within said cavity portion; e) a second seal ring retaining a relatively sliding seal face and a seal-tight face, said relatively sliding seal face being able to form a sealing contact with said seal face of said first seal ring, said seal-tight face being disposed on the outer circumference and facing against said reducing face; and f) a seal collar retaining said second seal ring in a seal-tight manner and being sealably secured to said shaft, g) a packing is provided to prevent said quenching fluid from leaking outboard, wherein said second seal ring further comprising a contact face disposed axially opposite said relatively sliding seal face; said seal collar further comprising a retainer face configured to oppose said contact face; and said packing further comprising an installation portion sandwiched between said contact face of said second seal ring and said retainer face of said seal collar, wherein a seal contact face opposite said installation portion is arranged in a seal-tight contact with said reducing face, thereby preventing the quenching fluid within said cavity portion from leaking outboard.