SCREW COMPRESSOR

WIPO Patent Application WO/2018/117276

A8

This screw compressor is equipped with: a screw rotor 2 that is formed from a rotor part 21 and a shaft part 23; a casing 4 that is provided with a shaft hole 53a through which the shaft part 23 is inserted, and that houses the screw rotor 2; and a discharge-side shaft sealing portion that seals leakage of a working fluid from a gap G2 between the shaft part 23 and the shaft hole 53a. The discharge-side shaft sealing portion is provided with: an annular groove 71 that is provided to the shaft part 23; a sealing ring 72 that is disposed within the annular groove 71 in a manner capable of movement in the axial direction of the shaft part 23, and that is capable of sliding contact with the shaft hole 53a and the side wall surfaces 77, 78 of the annular groove 71; and a shaft-sealing fluid supply channel that communicates with the shaft hole 53a and is for supplying fluid to either side of the sealing ring 72 in the axial direction. The pressure of the fluid supplied via the shaft-sealing fluid supply channel to one side of the sealing ring 72 in the axial direction is set higher than the pressure acting on the other side in the axial direction. As a result, excellent shaft sealing performance can be achieved even if there is circumferential direction pressure distribution in the working fluid on the discharge side of the screw rotor 2.

CHIBA KOTARO (JP)
TAKANO MASAHIKO (JP)
MORITA KENJI (JP)
TAKEUCHI YOSHITAKA (JP)
TSUCHIYA TAKESHI (JP)

PCT/JP2018/006146

August 23, 2018

February 21, 2018

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HITACHI INDUSTRY EQUIPMENT SYSTEMS CO LTD (JP)

F04C27/00; F04C18/16; F04C29/00; F04C29/02

KAICHI IP (JP)

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