Hitachi, Ltd.

Minoru Sato

Toshio Hatada

Masaaki Itoh

Minetoshi Izushi

Masami Suzuki

Kensaku Oguni

Takao Senshu

Isao Takahashi

Hiromu Yasuda

Yoshio Yoshioka

Hirokiyo Terada

Hideyuki Kimura

Yoshihiko Mochizuki

Takeo Tanaka

Yutaka Imaizumi

Tatsuya Sugiyama

Naoto Katsumata

Makoto Nagai

Mineo Takahashi

Kazumi Aiba

Yukio Nakagawa

Sumiyoshi Takeda

Naoki Shikazono

Takanao Kurasawa

Minoru Tanikawa

Hiromi Tsuji

A heat exchanger composed by overlapping a plurality of heat exchanger units each of which is formed by inserting a plurality of fins over one or a plurality of heat transfer tubes. The fins are worked so that a pair of opposed fins of the overlapped heat exchanger units are brought into contact with each other at one or more points. This heat exchanger constitutes an air conditioner when the heat exchanger units are overlapped in a direction of gravity.

Heat exchanger and air conditioner using same

A fin-tube type heat exchanger has parallel heat transfer tubes and a stack of a plurality of plate fins mounted on the tubes. Heat exchange is conducted between a first fluid flowing through the tubes and a second fluid flowing through the stack across each of the fins. Each fin has flat tube-mounting portions spaced in the longitudinal direction of the fin and formed with tube-mounting holes and a louver section disposed between each adjacent pair of tube-mounting portions. The louver section has elongated slats extending longitudinally of the fin and having side edges each spaced from an adjacent side edge of an adjacent slat. The slats are classified into two groups in respect of the cross-sectional shape. The slats of one group have generally flat cross-sections to reduce the resistance of the fin to the flow of the second fluid through the stack and are disposed in planes offset from the plane of the tube-mounting portions. The slats of the other group have V-shaped or inverted V-shaped cross-sections to increase stiffness of the fin in the longitudinal direction thereof.

Fin-tube type heat exchanger

An improved method of producing a scroll type compressor having an orbital scroll member and a stationary scroll member. The orbital scroll member is fabricated by a process comprising the steps of: forming an end plate and a spiral wrap separately, the end plate being composed of an upper half part having a discontinuous joining portion for joining the spiral wrap and a lower half part having an oil passage. The upper half part and the lower half part of the end plate are fixed to each other through mutual engagement between locating projections formed by a plastic work on one of the half parts and mating holes formed in the other of the half parts. The stationary scroll member is produced by a process similar to the process used in fabricating the orbital scroll, comprising the steps of: forming an end plate and a spiral wrap separately, the end plate being punched from a sheet blank; forming a discontinuous joining portion on one side of the end plate; joining the spiral wrap to the end plate at the discontinuous joining portion; joining the end plate to one end of a sleeve; and joining a flange to the other end of the sleeve. The discontinuous joining portion may be constituted by a plurality of projections formed to project from the surface of the end plate, or may include a plurality of grooves or recesses formed in the surface of the end plate and projections formed on the end surface of the wrap at positions corresponding to the grooves or recesses.

Method of producing scroll type compressor

A puffer type gas circuit breaker comprises a first and a second arcing electrodes movable relative to each other, an insulating nozzle surrounding the second arcing electrode, a puffer device for introducing an arc-suppressing gas into the insulating nozzle to puff out the arc produced between the two arcing electrodes when the breaker is in motion for circuit breaking, and a movable shield device for relieving the concentration of an electric field at the front end of the first arcing electrode during the breaker motion for circuit breaking. When the breaker is closed and the circuit made, the movable shield device surrounds the first arcing electrode and insulating nozzle, with a predetermined gap between itself and the insulating nozzle opposite thereto, and is kept at the same potential as the first arcing electrode. The circuit breaker further includes a device for maintaining the predetermined gap and the same potential at least in the early stage of the breaker motion for current breaking.

Puffer type gas circuit breaker

Growing community of inventors

Shimizu, Japan

Minoru Sato