Multi-blade fan for air-cooled engine

Details Multi-blade fan for air-cooled engine Multi-blade fan for air-cooled engine

2006-06-01

2009-11-17

Nguyen, Ninh H (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

Rotor having flow confining or deflecting web, shroud or...

Radially extending web or end plate

C416S18600A, C416S189000, C416S243000, C416S22300B

Reexamination Certificate

active

07618239

ABSTRACT:
In a multi-blade fan for an air-cooled engine, by defining the inlet angle β1and the angle β′2to make the sum thereof less than 80° (preferably defining β1as 32° and β′2as 36°), the multi-blade fan achieves greater air volume than in the case where the sum is made 80° or greater, where β1is the angle between the relative velocity direction and the peripheral direction on the inlet side of the blades, β2is the angle between the relative velocity direction and the peripheral direction on the outlet side of the blades, and β′2is the difference obtained by subtracting β2from 180°. The number of blades can therefore be reduced to realize lower noise level while still maintaining the same air volume as the prior art multi-blade fan.

REFERENCES:
patent: 5964576 (1999-10-01), Fujita et al.
patent: 6558120 (2003-05-01), Kim et al.
patent: 6769876 (2004-08-01), Sakai et al.
patent: 7179050 (2007-02-01), Hopfensperger
patent: 7281898 (2007-10-01), Baek et al.
patent: 2003/0012649 (2003-01-01), Sakai et al.
patent: 2001-271791 (2001-10-01), None

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