Hitachi, Ltd.

Hitachi Const. Machinery Co.

Keiji Taguchi

Akiomi Kohno

Akihiko Yamamoto

Kazuaki Yokoi

Takahiro Daikoku

Koji Hayashi

Masami Masuda

Toshihiro Yamada

Nobuo Abe

Ryoji Okada

Yoshiharu Ueyama

Mitsuaki Haneda

Shigeya Kawaminami

Toshio Yamanaka

Toshimi Sasaki

Kazuo Ikeda

Atushi Shimada

Nobuyoshi Hidao

Motohiro Satoh

Kooichi Inaba

Kazuo Niikura

Takeshi Hachisu

Fumiuki Kobayashi

Hidenari Takada

Kunio Fukami

Tatuya Wakana

Motohiro Satou

Hiroshi Misumi

Akiomi Kohono

Toshihiri Yamada

Masanori Wakaizumi

Nobutoshi Hoshino

Tatuo Horie

Kazuyuki Koide

Kiyohito Tani

Tetsuo Matsumoto

A vane member comprises a first member and a second member, the first member and the second member are joined by that an insert member whose melting temperature is lower than melting temperatures of the first and second members contacts the first and second members, the insert member is heated to a welding temperature which is lower than the melting temperatures of the first and second members and is higher than the melting temperature of the insert member so that a mutual diffusion between at least an original base component of the insert member and at least an original base component of the first member different from the original base component of the insert member and a mutual diffusion between at least the original base component of the insert member and at least an original base component of the second member different from the original base component of the insert member are caused by the heating, and the mutual diffusions by the heating are continued at least until the original base component of the insert member is replaced by at least one of the original base components of the first member and the second member and the at least one of the original base components of the first member and the second member becomes a substitute base component of the insert member.

Vane member and method for producing joint

A water machinery runner, which is highly reliable and is so excellent in wear and corrosion resistances that it can be used even under conditions where sediment is contained in a fluid includes crown 21, band 22 and blade 23 of a water machinery runner 2 to be rotated by a working fluid or a fluid flowing in a passage. The elements of the machinery runner are coated on at least portions of their individual surfaces with a first surface film containing a metal, as selected from the group consisting of Ni, Cr and Co, and a chromium carbide, and a second surface film containing a metal, as selected from the group consisting of Ni, Cr and Co, and a tungsten carbide.

Runner, water wheel and method of manufacturing the same

A closed type motor-driven compressor includes a motor accommodated in a closed container and a compression mechanism connected through a crank shaft to the motor. A shielding member having a cylindrical portion substantially concentric with the axis of the compression mechanism is disposed between the motor and the compression mechanism. This shielding member defines a shielding air space between the motor and the compression mechanism for preventing a permeation of a lubricating oil. An inlet of a discharge pipe of the closed type motor-driven compressor is positioned inwardly of this shielding air space.

Closed type motor-driven compressor, a scroll compressor and a scroll

In a sealed structure consisting of ceramic members opposing each other and a frame coupled to the ceramic members and defining an He-tight chamber with the ceramic members, the melting point of a joint member for bonding one of the ceramic members to the frame is lower than the melting point of another joint member for bonding the other of the ceramic members to the frame so that rebonding can be made.

Sealed structure and production method thereof

This invention discloses a method of soldering together at least two members selected form metals and ceramics, which comprises successively jointing a high-melting jointing material, a medium-melting jointing material, and a low-melting jointing material, and a sealing structure prepared by this method. The method according to present invention enables the preparation of a sealing structure having a soldered area which is excellent in tightness.

Sealing structure, method of soldering and process for preparing sealing

A quenching method wherein an object to be quenched is sprayed with a mixed spray jet of a liquid and a gas. The diameter of droplets in the mixed spray jet is from 50 to 200 .mu.m, and the mixing ratio between the liquid and the gas is varied during the period from the start to the end of cooling. Also disclosed is a quenching apparatus having nozzles for spraying an object to be quenched with a mixed spray jet of a liquid and a gas, a liquid supply source for supplying a pressurized liquid, and a gas supply source for supplying a pressurized gas. Each of the nozzles has a liquid-jetting port formed in the surface opened to the atmosphere and a gas-jetting port annularly formed around the liquid-jetting port on the same plane. The liquid-jetting port is communicated with the liquid supply source, while the gas-jetting port is communicated with the gas supply source. A flow rate regulating valve for regulating the flow rate of the pressurized liquid is disposed between the liquid-jetting port and the liquid supply source, while a flow rate regulating valve for regulating the flow rate of the pressurized gas is disposed between the gas-jetting port and the gas supply source.

Method and apparatus for quenching

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Ibaraki-ken, Japan

Keiji Taguchi