Title:
CENTRIFUGAL FAN
Document Type and Number:
Japanese Patent JP2005098272
Kind Code:
A
Abstract:
To provide a centrifugal fan for a ventilating device of extremely low resonance noise.
Resonance noise generated by overlap or the like of prominent frequency of natural vibration as a latent characteristic of the centrifugal fan and natural frequency of a used DC motor is suppressed by reducing area which transmits vibration of a disk like hub plate 9 which is a support member of a blade 11 in an impeller 7. As an embodiment, area of the hub plate contacting air is reduced by providing a hole 10 on the hub plate or attaching damping material 19.
Inventors:
SHIBATA HIDETOSHI
Application Number:
JP2003371278A
Publication Date:
April 14, 2005
Filing Date:
September 25, 2003
Export Citation:
Assignee:
ROYAL ELECTRIC CO LTD
International Classes:
F04D29/28; F04D29/66; (IPC1-7): F04D29/28; F04D29/66
Domestic Patent References:
JPS61116098A | 1986-06-03 | |||
JPH03260398A | 1991-11-20 | |||
JPH09242693A | 1997-09-16 | |||
JP2003097488A | 2003-04-03 | |||
JPH09195980A | 1997-07-29 | |||
JPS60194194U | 1985-12-24 | |||
JPS63192993A | 1988-08-10 | |||
JPS57122198A | 1982-07-29 | |||
JPH0842495A | 1996-02-13 |
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