Patent ID: 8382121

Claim:
A double mechanical seal device, for an apparatus having a shaft bore into which a rotary shaft is penetrated, said double mechanical seal device being mountable on an outer surface surrounding said shaft bore of said apparatus without using space in said apparatus, said double mechanical seal device comprising: a rotary ring mounted on said rotary shaft so as to rotate together with the rotary shaft, the rotary ring having seal surfaces formed on each of both axial end surfaces; an inside stationary ring arranged at an inside of said rotary ring, the inside stationary ring having a seal surface sealingly contacting and sliding with said seal surface of the rotary ring at an inside end of the rotary ring; an outside stationary ring arranged at an outside of said rotary ring, the outside stationary ring having a seal surface sealingly contacting and sliding with said seal surface of the rotary ring at an outside end of the rotary ring; a seal case axially-movable supporting said inside stationary ring; and a seal cover into which said rotary shaft is penetrated, mounted sealingly on said outer surface of said apparatus having said rotary shaft with a gasket interposed between an inside end surface thereof and said outer surface of said apparatus, the seal cover having an inner bore, the seal cover accommodating said seal case, said inside stationary ring, said rotary ring and said outside stationary ring in said inner bore, and the seal cover axially-movably supporting said outside stationary ring at an outside end of the apparatus; wherein said seal cover is provided with a flange portion having a groove for getting through a member for fixing the seal cover on an outer surface of said apparatus, the groove being cut in from an outer diameter toward an inner diameter of said rotary shaft; and wherein said seal case is radially fixed to said seal cover and installed at the inside end of said seal cover by a screw member installed so as to reach said inner bore from an inner diameter side of said groove toward further inner diameter side.