Hitachi, Ltd.

Eiichi Ito

Kazuo Kobayashi

Masayuki Fujio

Susumu Yamazaki

Hiroshi Asabuki

Kengo Hasegawa

Yukio Chihara

Takashi Watanabe

Hiromoto Ashihara

Hajime Fujita

Kanzi Mizutani

Yuichi Nakatsuhama

Yukio Makuta

Kazuo Yanagiya

Tomoya Tamura

Toshiharu Yoshidomi

Takeshi Abe

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

A vortex flow blower including a blower casing having an annular flow passageway extending from an inlet port for receiving fluid to an outlet port for discharging the fluid, the outlet port being disposed adjacent to the inlet port, and an impeller accommodated in the blower casing for producing a vortex flow of the fluid in the annular flow passageway. The vortex flow blower is configured for enabling at least one of noise reduction pressure increase and reduction of power requirements of the vortex flow blower, by providing at least one of sectional area reducer for reducing a sectional area of the annular flow passageway which annular flow passageway includes an annular groove disposed in facing relation to vanes of the impeller, and a partition wall partitioning a part of the circumference of the annular groove so that the inlet port and the outlet port being provided at opposite end portions of the annular groove partitioned by the partition wall with the sectional area reducer is disposed at a position of the annular passageway located between the outlet port of the annular passageway and a midpoint between the inlet port and the outlet port of the annular passageway, and an auxiliary flow supply path for supplying an auxiliary flow of the fluid introduced to the annular flow passageway from the inlet port so as to conduct the fluid in a direction to form the vortex flow.

Vortex flow blower

Vortex blower

Growing community of inventors

Narashino, Japan

Eiichi Ito