Patent ID: 9157530
Filing Date: 2015-10-13
Classification: F01D,F16J

Abstract:
1. A sealing device which is fitted into an annular groove formed in an outer periphery of a shaft so as to seal an annular gap between said shaft and a housing which rotate relative to each other, thereby to hold a fluid pressure in a region to be sealed which is constructed such that the fluid pressure therein changes, comprising: an outer peripheral ring made of resin that is in intimate contact with a side wall surface of said annular groove at a low pressure side thereof, and slides with respect to an inner peripheral surface of a shaft hole in said housing through which said shaft is inserted; and an inner peripheral ring made of a rubber-like elastic body that is in intimate contact with an inner peripheral surface of said outer peripheral ring and a groove bottom surface of said annular groove, respectively, thereby to push said outer peripheral ring toward an outer peripheral surface side thereof; wherein said outer peripheral ring is formed on its outer peripheral surface with a concave portion which extends from an end of a high pressure side to a position which does not arrive at an end of a low pressure side, so as to introduce fluid thereinto from the high pressure side, in a state where said outer peripheral ring is fitted in a normal direction; and wherein said outer peripheral ring is formed with a fitting direction detection passage that forms a flow passage through which fluid to be sealed leaks from the high pressure side to the low pressure side, in a state where said outer peripheral ring is fitted in a reverse direction.