Importance

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Abstract

The object of the present invention is to provide a divisional type mechanical seal of outside type which joins the seal face in flat and strongly even in a seal ring having a different thickness in the radial direction, and to exhibit an appropriate sealing ability. In the mechanical seal device of the present invention, the circumference grooves 31 to 34 and 71 to 74 are formed in correspondence with the thicker area 38 and 78 and the thinner area 39 and 79 at the outer peripheral face of the seal ring 30, 70; and the circumference grooves 51 to 54 and 91 to 94 are formed in correspondence with the circumference direction grooves 31 to 34 and 71 to 74 at the inner peripheral face of the holder 50 and 90. By placing the O rings 41 to 44 and 81 to 84 in between the circumference grooves 31 to 34 and 71 to 74 of the seal ring 30 and 70, and the circumference grooves 51 to 54 and 91 to 94 of the holder 50 and 90, the holder having a ring shape of which the divisional parts of each holder is joined by the bolts 55, 95 and 56 and 96 respectively corresponding to the thicker area 38, 78 and thinner area 39, 79; each divisional parts of the divided seal ring can be strongly joined and the each seal ring 30 and 70 are formed in ring shape.

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First Claim