Blade configuration for a ventilation fan

Details Blade configuration for a ventilation fan Blade configuration for a ventilation fan

1996-01-29

1997-07-22

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Radial flow devices

416234, 416238, 416243, 416DIG2, 415220, F04D 2938

Patent

active

056498071

ABSTRACT:
A structure of a ventilation fan provided with a plurality of blades has a performance curve characterized by a gentle slope throughout the wide operating range instead of an S-hysteresis curve, in order to overcome a fluctuation phenomena of the operating flow rate. The blade tip cross-section lies on a first imaginary cylindrical surface and an angle of attack and pitch angle of the blade tip are formed as respective trajections by intersecting the first cylindrical surface by a second cylindrical surface whose center axis has been rotated about two axes.

REFERENCES:
patent: 4373861 (1983-02-01), Papst et al.

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