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US 4,398,725 AGranted
Rotary shaft water seal device in hydraulic machine
AssigneeHitachi, Ltd.
InventorMuneo Maegawa
Life of this patent
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AssigneeHitachi, Ltd.
InventorMuneo Maegawa
Estimating the term…
A rotary shaft seal device in a hydraulic machine. With the water seal segments in the conventional water seal device, a gap tends to be generated between the inner peripheral surface of the segment packing and the outer peripheral surface of a liner of the rotary shaft due to the wear during use and progressively developed. The present invention contemplates to minimize the gaps between the adjacent segments and guide members interposed between the adjacent segments are solidly secured, whereby the flow rate of water leakage through the segments is reduced and the segments themselves are improved in mechanical strength, so that the segments can be reduced in size and the water seal device itself can be rendered compact in size.
A rotary shaft water seal device in a hydraulic machine, wherein a solid packing in which a plurality of circular arcuate segments are annularly arranged such that adjacent segments are spaced apart from each other through a slight gap is received in a packing box provided on the outer periphery of a rotary shaft with the inner peripheral surface of said packing being brought into sliding contact with the outer peripheral surface of said rotary shaft and guide members to guide the segments to be displaced in the radial direction of the axis of the segments are provided on the packing box, respectively, characterized in that each of said guide members is disposed in a space formed between the adjacent segments and outside said gap, being solidly secured to the packing box.
Dependencies are inferred from the claim text.