Kabushiki Kaisha Toshiba

Yasuhiko Aida

Hiroshi Niwa

Kiyoshi Hattori

Hiroshi Miyano

Akira Nakamura

Tadashi Narabayashi

Nobuhiko Tanaka

Katsumi Yamada

Takao Fujii

Osamu Ozaki

Katsuhiko Mawatari

Akimitsu Omori

Shigeaki Tsunoyama

Hideo Komita

Takashi Ishitori

Kunio Shimano

Yuuji Maeda

Toshiaki Nasuda

Eiji Manome

Yoshiyuki Sakurai

Iwao Oshima

Yuji Maeda

The storage device reduces vibration accompanied by high-speed rotation of a storage media, and raises reliability as well. In a stationary position of amass object, each magnetic pole of the movable portion magnet is disposed so that their position is provided in opposite relation to each magnetic pole of a fixed portion magnet, and each magnetic pole of a movable portion magnet and the fixed portion magnet is opposite a different magnetic pole with respect to each other. An attraction force:F,and a repulsion force:F,between facing (or confronting) magnetic pole can be used efficiently, and a large vibration energy or inertia force can be obtained by a small-sized magnet.

Storage device with vibration reduction unit

A dynamic vibration absorber comprises a movable portion including a movable weight portion, a movable portion magnet assembly provided with a movable inside magnet and a movable outside magnet which are mounted to the movable weight portion through a yoke so as to alternately provide different magnetic poles, a fixed portion fixed to an object to be damped, a fixed portion magnet assembly provided with a fixed portion inside magnet and a fixed portion outside magnet mounted to the fixed portion through a yoke so that the fixed portion magnet assembly has magnetic poles different from those of the movable portion magnet in opposed positions, respectively, and a conductor plate disposed in a gap defined between the fixed portion magnet assembly and the movable portion magnet assembly.

Dynamic vibration absorber

A dynamic vibration absorber includes a movable weight portion, and a movable portion magnet assembly provided for the movable weight portion. The movable portion magnet assembly includes a magnet train having a plurality of cylindrical magnets disposed coaxially in such a manner that adjacent cylindrical magnets have different adjacent magnetic poles. A fixed portion is provided in opposed relation to the movable weight portion and a fixed portion magnet train is provided on the fixed portion and includes a plurality of magnets having magnetic poles different, in a stationary state, from opposed magnetic poles of the cylindrical magnets. The movable weight portion is preferrably disposed in a vessel. A magnetic damper is further provided, which has a plurality of conductor plates mounted on an outer peripheral surface of the movable weight portion, and a plurality of yokes are secured to an inner surface of the peripheral side portions of the cylindrical vessel at portions corresponding to the conductor plates. Each of the yokes have a pair of yoke portions facing each other, and a pair of magnets are provided on the facing surfaces of the paired yoke portions with a gap therebetween into which the corresponding conductor plates are inserted.

A boiling water reactor comprises a reactor pressure vessel accommodated in a vertical fashion, a core disposed at a low portion in the reactor pressure vessel, a plurality of control rods to be inserted from an upper side of the core into the spaces between adjacent fuel assemblies and withdrawn therefrom upwardly, a shroud surrounding the fuel assemblies so as to define the core and having an upper end opening, a shroud head which closes the upper end opening of the shroud and through which the control rods are inserted or withdrawn, a separator standing upward from the shroud head to carry out gas-water separation of steam generated from the core, a fixing pedestal disposed above the separator, a control rod driving mechanism mounted on the fixing pedestal and adapted to drive the control rods, a drier unit including a plurality of drier elements annularly arranged along an upper inner wall surface of the reactor pressure vessel and adapted to dry the steam passing through the steam flow hole of the fixing pedestal, and a jet pump unit disposed in a space between an outer surface of the shroud and an inner wall surface of the reactor pressure vessel.

Boiling water reactor

Growing community of inventors

Yokohama, Japan

Yasuhiko Aida