Blower fan blade

Details Blower fan blade Blower fan blade

1989-11-03

1990-11-13

Wayner, William E.

Fluid reaction surfaces (i.e., impellers)

With control means responsive to non-cyclic condition...

Temperature or icing condition responsive

415 12, B63H 300, F01D 512

Patent

active

049697994

ABSTRACT:
Each blade of a blower fan has a parallel wire group for each side whose thermal expansion coefficient is smaller than that of the blade. The two parallel wire groups are provided substantially over the whole area of a suction-side surface and of a discharge-side surface of the blade such that they extend from the front edge of the suction-side surface and from the rear edge of the discharge-side surface outward obliquely to the radial direction of the blade to cross each other on the face and back sides so as to result in the shape of an "X". Due to a difference of thermal expansion coefficient, in a high-temperature state, camber appears on the blade in oblique directions, and the front edge and the rear edge camber in opposite directions; thus, the blade undergoes torsional deformation to largely vary the angle of incidence.

REFERENCES:
patent: 3373930 (1968-03-01), Rom
patent: 4778339 (1988-10-01), Usui et al.
patent: 4846629 (1989-07-01), Takigawa
patent: 4859150 (1989-08-01), Takigawa

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