Hitachi, Ltd.

The Kansai Electric Power Co., Inc.

The Kansai Electric Co., Inc.

Ichiro Hitomi

Hisao Inoue

Osamu Sugimoto

Teiji Horita

Katsutoshi Nii

Takao Kuwabara

Akira Bando

Kazuhiko Kawaike

Kenichi Ono

Akihiro Sakayori

Junichi Shiozaki

Shigeaki Hayashi

Koozi Aizawa

Masahiro Minato

A lubricated bearing apparatus for a hydraulic machinery has rotary-side ceramic sliding plates disposed in contact with bearing-side ceramic sliding plates. The rotary-side ceramic sliding plates are disposed in receiving grooves of a main shaft sleeve member fixed to the main shaft. The main shaft sleeve member is provided with preventing portions for preventing the rotary-side ceramics sliding plates from being broken by the centrifugal force. Thus, ceramic materials can be used both on the rotary side and the bearing side, thereby lengthening the usable life of the bearing apparatus.

Lubricated bearing apparatus for hydraulic machinery

An end face mechanical shaft seal for use in a hydraulic machine includes a seal ring assembly detachably secured to a seal casing and having a sealing face which makes a sliding and fluid-tight contact with an annular seat face presented by a flange on the rotor shaft. The seal ring assembly is of a cartridge type which includes a ring casing having an annular groove formed in one end surface thereof and a seal ring partly received in the groove and fixed to the ring casing by an adhesive. Each of the ring casing and the seal ring is constituted by a plurality of arcuate sections or segments which are connected together in the circumferential direction.

End face mechanical shaft seal for use in hydraulic machines and seal

Disclosed in a variable speed pumping-up electrical power system comprising a variable speed generator/motor, a frequency converter connected between the generator/motor and an a.c. power system, a controller controlling an effective power input to the generator/motor by controlling the frequency converter on the basis of the difference between an actual effective power input from the a.c. power system and an externally-applied effective power command, and a correction circuit correcting the effective power command on the basis of the difference between the frequency of the a.c. power system and a frequency setting.

Variable speed pumping-up electrical power system

Growing community of inventors

Katsuta, Japan

Ichiro Hitomi