Mixed flow impeller
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsTeruhiko Tomohiro, Masahiro Atarashi
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Abstract
The disclosure is directed to a mixed flow impeller with a low noise, to be used for a blower of an air conditioner or the like. The mixed flow impeller of the present invention is characterized in three points, i.e., thin thickness blade member increased in its thickness only at its leading edge, a plate-like triangular protrusion provided at an outer peripheral portion of the leading edge, and blade curvature line having its maximum curvature position deviated toward the trailing edge side through employment of a cubic curve. Since each of the above features may be caused to function independently, noise reduction is possible even if it is executed singly, but the maximum effect is available when the are effected in combination.
Claims8
A mixed flow impeller which comprises a hub portion of a generally truncated conical shape, and a plurality of blade members secured to a peripheral portion of said hub portion, each of said blade members being arranged to be generally in a straight line shape at its leading edge portion as viewed in a direction of a rotary axis thereof, and having an approximately arcuate shape in a cross section at said leading edge portion, with a thickness larger than that of said blade member.
A mixed flow impeller which comprises a hub portion of a generally truncated conical shape, and a plurality of blade members secured to a peripheral portion of said hub portion, each of said blade members being arranged to be generally in a straight line shape at its leading edge portion as viewed in a direction of a rotary axis thereof, and being integrally formed, at an outer side of its leading edge, with a triangular portion having a thickness generally equal to that of the blade-member so that a base of said triangular portion closely adheres to said leading edge portion, with an apex thereof being located at a forward portion in a rotating direction of said blade member, and with one side of said triangular portion generally extending along an external circumference of said impeller.
A mixed flow impeller which comprises a hub portion of a generally truncated conical shape, and a plurality of blade members secured to a peripheral portion of said hub portion, wherein a curvature curve connecting the leading edge and trailing edge of each of said blade members is formed by a cubic curve, with a maximum curvature height (h.sub.max) of said blade member being located nearer the trailing edge than a central portion between said leading edge and trailing edge, and said maximum curvature height (h.sub.max) being generally equal to a maximum curvature height (h.sub.arc) when the blade member is formed by an arc.
Dependencies are inferred from the claim text.