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US 4,969,799 AGranted
Blower fan blade
AssigneeUsui Kokusai Sangyo Kaisha Limited
InventorsMasayoshi Usui, Takeshi Matsumoto
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AssigneeUsui Kokusai Sangyo Kaisha Limited
InventorsMasayoshi Usui, Takeshi Matsumoto
Estimating the term…
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.
A blade of a blower fan having a plurality of blades projecting radially outward from the outer periphery of an attaching member with an attaching wall, characterized in that a parallel wire group whose thermal expansion coefficient is smaller than that of the blade is provided substantially over the whole area of a suction-side surface and of a discharge-side surface of the blade such that the two parallel wire groups 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".
Dependencies are inferred from the claim text.