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Patent Searching and Data


Title:
IMPELLER FOR BLOWER
Document Type and Number:
Japanese Patent JP3513367
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To uniformize the distribution of speeds by inclining a line of intersection of a cylindrical surface around the center of an impeller and a pressure surface (negative pressure surface) of a vane in relation to a rotary shaft, and forming an angle between the pressure surface (negative pressure surface) of the vane and the radial direction in the line of intersection nearly equal over the whole in the height direction.
SOLUTION: In a blower, in which a suction guide 9 is inserted into a suction part of an impeller 5 and the impeller 5 is driven for rotation by a motor 4, an angle between a tangent of a pressure surface of a vane and the radial direction at a position, in which a shroud side A-A cross section and a boss side B-B cross section and a cylindrical surface at an optional radius (r) from the center of rotation intersect each other, is set nearly equal to each other in a cylindrical surface having a radius (r). An E-E cross section of the vane in the cylindrical surface having the radius (r) is set at a nearly constant angle of inclination in relation to a rotary shaft of the impeller. With this structure, peeling of a flow at a vane inlet shroud side is restrained by the rotation of the impeller 5, and the distribution of speed is uniformized so as to improve the performance and lower the generation of noise.


Inventors:
Watanabe, Masatoshi
Otaguro, Toshio
Shimoide, Shinichi
Nagai, Makoto
Sato, Ryoji
Yoneyama, Hiroyasu
Hata, Yoshiki
Application Number:
JP1997000240979
Publication Date:
March 31, 2004
Filing Date:
September 05, 1997
Export Citation:
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Assignee:
HITACHI LTD
International Classes:
F04D23/00; F04D29/30; (IPC1-7): F04D29/30; F04D23/00
Attorney, Agent or Firm:
特許業務法人第一国際特許事務所 (外1名)