| 摘要 |
A mechanical seal in which cooling and cleaning of each seal ring and, in addition, lubrication of a slide seal surface are improved, which can be reduced in size, and whose assembly and disassembly are facilitated. The mechanical seal device has a seal cover ( 30 ) attached to an outer surface ( 61 ) of a device body, having a fitting surface ( 30 C) through which a shaft is insertable, and forming a space section ( 30 G) that is more on the outside (B) of a machine than the fitting surface ( 30 C); a quenching path ( 40 ) penetrating through the space section ( 30 G) and supplying quenching fluid into the space section ( 30 G); an annular restriction section ( 30 F) constructed in the seal cover ( 30 ) and provided more on the outside of the machine than the space section ( 30 G); a first seal ring ( 3 ) having a movement surface ( 3 D) that is sealingly movably fitted to the fitting surface ( 30 C) of the seal cover ( 30 ) and having a seal surface ( 3 A) inward of the space section ( 30 G); a second seal ring ( 10 ) having a relative slide seal surface ( 10 A) that can be in tight contact with the seal surface ( 3 A) of the first seal ring ( 3 ) and having on its outer peripheral surface a seal surface ( 10 D) that faces the restriction surface ( 30 F); a seal collar ( 50 ) for holding the second seal ring ( 10 ) in a sealed state and sealingly fixed to the shaft; and a packing ( 4 ) in tight contact with the seal surface ( 10 D) of the second seal ring ( 10 ) and with the restriction surface ( 30 F) of the seal cover ( 30 ) to prevent the quenching fluid from leaking out of the machine.
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