Title:
DRAINAGE PUMP
Document Type and Number:
Japanese Patent JP3647939
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reduce a noise of a drainage pump by arranging a space in outer peripheral parts of large diameter blades of a rotary blade having platelike large diameter blades and a platelike small diameter blade continuing with these.
SOLUTION: A rotary blade 50 has light platelike four large diameter blades 60 projecting in a radial shape from the outer periphery of a motor installing shaft part 52 and a small diameter blade 54 whose diameter is smaller than the large diameter blades 60 composed of plural plates projecting in a radial shape from the outer periphery with a small diameter blade shaft part 55 coaxial with a central shaft of the motor installing shaft part 52 as the center. A ring-shaped space 70 is formed in outer peripheral parts of the large diameter blades 60 of this rotary blade 50. This space 70 is formed by being surrounded by an outside cylindrical wall member 64 to cover the outer periphery of the platelike large diameter blade 60, an annular member 62 extending inside along the upper edge of the large diameter blades 60 from an upper end part of the cylindrical wall member 64 and an inside cylindrical member 66 opposed to the outside cylindrical wall member 64 by extending to the lower side from the inner peripheral end of the annular member 62.
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Inventors:
Masayuki Imai
Takashi Endo
Tatsushi Ninomiya
Takashi Endo
Tatsushi Ninomiya
Application Number:
JP23628895A
Publication Date:
May 18, 2005
Filing Date:
September 14, 1995
Export Citation:
Assignee:
Fuji Koki Co., Ltd.
International Classes:
F04D1/14; F04D11/00; F04D13/00; F04D29/22; F04D29/54; (IPC1-7): F04D11/00; F04D13/00; F04D29/22
Attorney, Agent or Firm:
Patent Business Corporation Daiichi International Patent Office
Yoshiaki Numagata
Takio Sumiyoshi
Yasue Numagata
Yoshiaki Numagata
Takio Sumiyoshi
Yasue Numagata