Patent ID: 9709174
Date: 2017-07-18
CPC Classifications: F04D,F16J

Claim:
1. A sealing device provided with a floating ring between an outer periphery of a rotating shaft and an inner periphery of a casing, the sealing device being characterized in that: a plurality of inversely directed dynamic pressure generation grooves for creating an action, whereby a sealed fluid on a sealed fluid side attempting to leak out to an atmospheric side is pushed back upstream and an axis of the floating ring and an axis of the rotating shaft are to be aligned when in use, are provided and discretely aligned along one circle on an inner peripheral surface of the floating ring in a circumferential direction in a manner continuously overlapping each other as viewed in a direction perpendicular to the circumferential direction, all the grooves being inclined with respect to the circumferential direction and closed at least on the atmospheric side, wherein the floating ring is disposed between and in contact with an atmospheric fluid and the sealed fluid that attempts to leak out downstream to the atmospheric fluid along the inner peripheral surface of the floating ring and that is pushed back upstream by dynamic pressure generated by the grooves when in use, and a turn-stopping pin is provided to an outermost peripheral surface of the floating ring facing the inner periphery of the casing so as to protrude radially outward, wherein the turn-stopping pin is loosely fitted into a groove formed radially outward from the inner periphery of the casing so as to allow the floating ring to move to match the center of the floating ring and the center of the rotating shaft by dynamic pressure generated by the grooves when in use.