Title:
SUCTION PORT STRUCTURE OF CENTRIFUGAL BLOWER
Document Type and Number:
Japanese Patent JP3394165
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To lower the generation of noises in a suction port by fitting a suction box having a suction flow lead-in space having a specified lateral cross sectional shape and formed of a porous inner panel and a nonporous outer panel to a suction port of a centrifugal blower, and covering an appropriate part of the suction box with a sound absorbing material.
SOLUTION: A suction box 5 partitioned with a suction flow lead-in space 4 continued to an impeller inlet 6a and formed of a porous inner panel 9A and a nonporous outer panel 9B surrounding the inner panel 9A through an air layer 10 is fitted to a suction port 2 of a centrifugal blower 1. The suction flow lead-in space 4 is formed of a nearly semi-cylindrical space 4A extended in the direction of an impeller shaft 6b and a nearly trapezoidal space 4B continuously provided to the space 4A and extended in a direction crossing the impeller shaft 6b and opened to the atmospheric air at an end thereof, and has a nearly bell-shaped lateral cross section. A back surface of the inner panel 9A is covered with sound absorbing materials 11A-11C, and an inner surface of the outer panel 9B is covered with a sound absorbing material 11D so as to improve the sound absorbing effect.
Inventors:
Kinichi Shima
Application Number:
JP25755497A
Publication Date:
April 07, 2003
Filing Date:
September 04, 1997
Export Citation:
Assignee:
Showa Denki Co., Ltd.
International Classes:
F04D29/44; F04D29/66; (IPC1-7): F04D29/44; F04D29/66
Domestic Patent References:
| JP8189333A | ||||
| JP6045900U | ||||
| JP178298U |
Attorney, Agent or Firm:
Yoshimura Katsutoshi (1 outside)
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