초록 ▼

A seal construction is provided for sealing a rotating shaft against passage of a fluid along its central axis. The sealed construction includes a sealing flange fixedly mounted on the shaft and rotatable with the shaft. The sealing flange has a forward and rear surface extending radially from the c

A seal construction is provided for sealing a rotating shaft against passage of a fluid along its central axis. The sealed construction includes a sealing flange fixedly mounted on the shaft and rotatable with the shaft. The sealing flange has a forward and rear surface extending radially from the central axis of the rotating shaft, the forward surface of which is exposed to the fluid to be sealed against. There is then provided a stationary sealing mechanism for creating a fluid seal between the rear surface of the rotatable sealing flange and this stationary sealing mechanism. A diaphragm is then provided across a fluid passageway associated with the rear surface of the stationary sealing mechanism in such a way such that any increase in pressure in the fluid to be sealed against upon the diaphragm will cause the diaphragm to flex radially inwardly, thereby increasing the area of the rear surface of the engaging member exposed to the fluid pressure which then further urges a tighter seal.

대표청구항 ▼

A seal construction for sealing a rotating shaft against passage of a fluid along a central axis of said rotating shaft, said seal construction comprising: a) a sealing flange means fixedly mounted on said shaft and rotatable therewith about said central axis, said sealing flange having a forward an

A seal construction for sealing a rotating shaft against passage of a fluid along a central axis of said rotating shaft, said seal construction comprising: a) a sealing flange means fixedly mounted on said shaft and rotatable therewith about said central axis, said sealing flange having a forward and rear surface, each of said surfaces central axis, said forward surface of said flange being exposed to said fluid to be sealed against and a stationary sealing means for creating a fluid seal between said rear surface of said rotatable sealing flange and said stationary sealing means, said stationary sealing means comprising: an engaging member having a first forward surface located for sealing engagement with said rear surface of said sealing flange and a second rearward surface, said engaging member being spaced radially outwardly from and extending circumferentially around said rotating shaft, biasing means for normally urging said first forward surface of said engaging member into sealing engagement with said rear surface of said sealing flange, a fluid passageway communicating said fluid to be sealed with said second rearward surface of said engaging member, and a diaphragm means extending across said fluid passageway for determining the amount of force placed on the said second rearward surface of said engaging member by said fluid to be sealed, said diaphragm means being attached across said fluid passageway in such a way that any increase in pressure of said fluid to be sealed upon said diaphragm will cause said diaphragm to flex radially inwardly, thereby increasing the surface area of said second rearward surface of said engaging member exposed to the pressure of said fluid to be sealed, the net effect of said radially inward flexing of said diaphragm means being to further urge said first forward surface of said engaging member into sealing engagement with said rear surface of said sealing flange.