| 摘要 |
<p>Provided is an underwater water turbine generator that comprises a shaft-sealing device that does not require a lubricant and can rotate at high speed. A first sealing unit 110 of a shaft-sealing device 100 that performs shaft sealing between a water turbine chamber 40 and a generator chamber 50 includes a first rotating ring 112 that is arranged on the side of the water turbine chamber and fixed to a rotating shaft member, a first fixed ring 114 that is arranged on the side of the generator chamber and fixed to a casing 10, and an urging member (116) that urges the first fixed ring to the first rotating ring. One of the first rotating ring and the first fixed ring is a pressureless sintered SiC sliding member, and the other one is a carbon-SiC sliding member in which a part of carbon in a surface layer is changed to SiC. A second sealing unit 150 includes a second rotating ring 152 that is arranged on the side of the water turbine chamber and fixed to the rotating shaft member and a second fixed ring 154 that is arranged on the side of the generator chamber to slide-contact the second rotating ring. One of the second rotating ring and the second fixed ring is a pressureless sintered SiC sliding member, and the other one is a carbon sliding member.</p> |
