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Title:
CENTRIFUGAL BLOWER
Document Type and Number:
Japanese Patent JPH01170798
Kind Code:
A
Abstract:

PURPOSE: To reduce noise when ventilating pressure changes and to improve fan efficiency by varying a winding angle according to a ventilating resistance value when air is sucked or discharged by a centrifugal fan and varying an expansion angle extending over the whole winding angle.

CONSTITUTION: A winding angle of an air passage 18 and an expansion angle thereof extending over the whole winding angle are varied by a movable wall 23 provided in the air passage 18 of a blower 11 according to a change of ventilating resistance value for air sucked or discharged by operation of a centrifugal fan 14. in this arrangement, even if ventilating resistances downstream and upstream from the blower 11 change, the winding angle of the air passage 18 and the expansion angle extending over the whole winding angle can be changed, so that an air flow generated by operation of the centrifugal fan 14 can keep a flow based on free vortex motion. Accordingly, it is possible to increase an effect of reducing blowing noise and improving fan efficiency produced by changing the winding angle and expansion angle according to a change of ventilating resistance.


Inventors:
AKAIKE SHIGERU
KOKUBO AKIHISA
SAKA KOICHI
Application Number:
JP1987000328157
Publication Date:
July 05, 1989
Filing Date:
December 24, 1987
Export Citation:
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Assignee:
NIPPON DENSO CO
International Classes:
F04D29/46; (IPC1-7): F04D29/46
Attorney, Agent or Firm:
小西 淳美



 
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