Hitachi, Ltd.

Hajime Fujita

Kazuo Kobayashi

Takashi Watanabe

Susumu Yamazaki

Masayuki Fujio

Hiroshi Asabuki

Kengo Hasegawa

Eiichi Ito

Hiromoto Ashihara

Yukio Chihara

Kazuo Yanagiya

Tomoya Tamura

Kanzi Mizutani

Yuichi Nakatsuhama

Yukio Makuta

Shinya Yoshinaga

Youji Sekine

Yoshiro Takada

Atsushi Ootsuka

A vortex flow blower used as an air source to be incorporated into general industrial machines. The vortex flow blower is characterized in that the shape of the blade in its impeller is three dimensionally formed such that at least the inner portion of the blade can be adapted to the three dimensional internal flow. According to the present invention, the aerodynamic performance can be significantly improved and the size of a vortex flow blower can be reduced. Furthermore, an impeller having three dimensionally shaped blades is manufactured by independently manufacturing the shroud and the blades and coupling them, so that the impeller of a complicated shape can be readily manufactured. Furthermore, since the blade can be made of a thin and light material, the secondary moment of inertia of the impeller can be reduced.

Method of manufacturing an impeller

Vortex flow blower having blades each formed by curved surface

Vortex flow blower having blades each formed by curved surface and

An air blower for an air conditioning unit or system including a cross-flow fan, with stabilizer being mounted in a passage on a suction side of the cross-flow fan so as to extend from both side plates of the cross-flow fan toward a central part thereof within a range of L/D.ltoreq.2.5, where L equals the length of each of the stabilizers and D equals the outside diameter of the cylindrical bladed rotor of the cross-flow fan. By virtue of such an arrangement the back flow developing at positions of low flow velocities near both side plates when the flowing resistance of the suction passage has increased is prevented thereby preventing the occurrence of cyclic unsteady noise.

Air conditioner employing cross-flow fan

Growing community of inventors

Tsuchiura, Japan

Hajime Fujita