Hitachi, Ltd.

Hitachi Plant Technologies, Ltd.

Shinichi Hirose

Seiji Tsuru

Junji Okita

Katsuaki Kikuchi

Tadashi Kaneki

Masaki Ohura

Hiroshi Tani

Katsuo Abe

Katsuyuki Tanaka

Muneo Mizumoto

Youichi Inoue

Yoshihiro Sato

Takashi Saito

Kazuya Kanazaki

Makoto Yamazaki

In a system for monitoring each of compressors distant from each other through at least one of internet communication, optical communication line, electric communication line and wireless communication, a server computer obtains actual condition data of the each of the compressors through the at least one of internet communication, optical communication line, electric communication line and wireless communication, and stores therein the obtained actual condition data and predetermined database to be compared with the obtained actual condition data to find a remarkable technical point in the compressor, and a service center computer outputs the remarkable technical point to at least one of a service person and the compressor so that the at least one of the service person, the compressor and the user of the compressor can handle appropriately the remarkable technical point in the compressor.

Compressor remote monitoring system

A screw compressor system comprises a plurality of screw compressors the capacity of each of which is controlled by repeating load operation and no-load operation. Using a timer output corresponding to compressed gas consumption in a demander including gas consumption equipments, a parent controller determines the number of compressors to be operated among the plurality of compressors. Among the compressors determined to be operated, all compressors other than one are put in load operation. In accordance with a load factor of the excepted one screw compressor, the parent controller controls discharge pressure of each compressor. At this time, the control is made so that discharge pressure of the screw compressor system measured by a pressure gauge be lower than that upon the maximum gas consumption.

Screw compressor system and operating method thereof

Compressor bodies, an accelerator and a main motor are disposed on a base, while an innercooler, an aftercooler an oil cooler and a coolant cooler are disposed perpendicular to the axial direction of the motor so that the directions, in which the tube nests of the gas coolers are drawn out, are made to be the same. A control panel having a maintenance display is mounted on a front panel composed of panel portions which are mounted pivotally around respective remote or opposite side ends. Portions to be inspected daily are disposed near the front panel and one side panel adjacent thereto.

Package-type screw compressor

The present invention provides a magnetic recording medium wherein the surface layer of the protective film of the medium is irradiated by ions to give a protective film having high reliability in resistance to sliding with the magnetic head, a process for producing the medium, an apparatus for producing the medium, and a magnetic recording apparatus having the medium mounted therein. The essentials of the present invention lie in introducing a minute surface roughness of atomic order in the surface of the protective film 5 constituting the outermost layer of a magnetic recording medium by irradiating atoms accelerated by high voltage (that is, by implanting ions) to the surface.

Magnetic recording medium, process for producing magnetic recording

Compressor bodies, an accelerator and a main motor are disposed on a base, while an intercooler, an aftercooler, an oil cooler and a coolant cooler are disposed perpendicular to the axial direction of the motor so that the directions, in which the tube nests of the gas coolers are drawn out, are made to be the same. A control panel having a maintenance display is mounted on a front panel composed of panel portions which are mounted pivotally around respective remote or opposite side ends. Portions to be inspected daily are disposed near the front panel and one side panel adjacent thereto. The compressor bodies including rotors that have been coated with a melted and solidified substantially homogeneous and continuous layer of a tetrafluoroethylene-perfluoroalkylvinylether copolymer that is substantially devoid of pinholes.

Package-type screw compressor having coated rotors

Growing community of inventors

Chiyoda, Japan

Shinichi Hirose