# US 4,398,725 A · Rotary shaft water seal device in hydraulic machine

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- Number: US 4,398,725 A
- Document ID: US4398725A
- Status: Granted
- Kind: A
- Application number: 06/435,627
- Filed: 1982-10-20
- Granted: 1983-08-16
- Earliest claimed: 1982-10-20
- Assignees: Hitachi, Ltd.
- Inventors: Muneo Maegawa
- Web page: https://patentgrep.com/patent/US4398725A

## CPC

- F03B 11/006: {Sealing arrangements (F03B3/14, F03B3/183, F03B13/083 takes precedence; sealings in general F16J)}
- F16J 15/26: with stuffing-boxes for rigid sealing rings
- Y02E 10/20: Hydro energy
- Y10S 277/922: Bonding or joining for manufacture of seal
- F03B: MACHINES OR ENGINES FOR LIQUIDS (positive-displacement engines for liquid F03C; machines for liquids and gases F01; positive-displacement machines for liquids F04, rotary fluid gearing of the hydrokinetic type F16H41/00)
- F16J: PISTONS {(specially adapted for dampers F16F9/32)}; CYLINDERS; SEALINGS
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

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.

## Claims

### Claim 1

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.

### Claim 2 (depends on 1)

A rotary shaft water seal device in a hydraulic machine as set forth in claim 1, wherein said guide member, upon being accurately positioned, is welded at the peripheral portion of said guide member.