Segmented seal

摘要

Provided is a segmented seal that is capable of suppressing the progress of wear in a key groove and thereby attains improvement in the durability of a seal ring. The segmented seal includes a key groove (15), as seen in an axial direction, has a groove body portion (15a) extending in a radial direction and a pair of clearance groove portions (15b, 15c) expanding to both sides of the groove body portion (15a) so as to be away from a key (50) on the inner peripheral surface side, and among the pair of clearance groove portions (15b, 15c), the clearance groove portion (15c) on an upstream side in a rotating direction ® of the rotating shaft (200) is configured to expand to an outer peripheral surface side beyond a tip end (50a) on an inner peripheral surface side of the key (50).

主权项

1. A segmented seal to seal an annular gap between a rotating shaft and a housing having a shaft hole through which the rotating shaft is inserted and having an annular concave portion opened to each of an inner peripheral surface side and one side in an axial direction, the segmented seal comprising:
a seal ring made of carbon being in intimate contact with a side wall face of the annular concave portion, and being disposed to be slidable on an outer peripheral surface of the rotating shaft, the seal ring being structured to be segmented into a plurality of segments in a circumferential direction thereof; and a key being secured to the housing in a state of being engaged with a key groove provided on the one side in the axial direction of the seal ring; wherein the key groove, as seen in an axial direction, has a groove body portion extending in a radial direction and a pair of clearance groove portions, each of the pair of clearance groove portions expanding to each side of the groove body portion respectively so as to be away from the key on the inner peripheral surface side, and among the pair of clearance groove portions, a clearance groove portion on an upstream side in a rotating direction of the rotating shaft is configured to expand to an outer peripheral surface side beyond a tip end on an inner peripheral surface side of the key, and is configured such that radial and circumferential dimensions thereof are large as compared with a clearance groove portion on a downstream side.