Axial-flow fan-blade with profiled guide fins
First Claim
Patent Images
1. An axial-flow fan having a axial portion formed along an axis and several fan blades installed around said axial portion;
- each fan blade being defined as having two surfaces positioned relative to said axis;
the rotation of said fan blades causing fluid flow through said blades, said fluid flow causing centrifugal force; and
means for producing centripetal force to balance said centrifugal force;
said centripetal force producing means including at least one fin extending from at least one of said surfaces of said fan blade;
each fin having an inner surface and an outer surface relative to the axis; and
the length of the fin measured along the outer surface being shorter than the length of the fin measured along the inner surface for producing said centripetal force.
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Abstract
An axial-flow fan-blade, with at least one profiled guide fin extending from the surface of each blade of the fan-blade, is able to control flow direction of the fluid and keep fluid flow speed stable; and, furthermore, offsets the centrifugal force (which is caused by rotation of the blade) with the centripetal force that is generated by pressure difference of the fluid flowing across both sides of each profiled guide fin. The fan blade minimizes turbulent flow, reduces noise generated by vibration of the blades, and increases rigidity of the blades.
56 Citations
16 Claims
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1. An axial-flow fan having a axial portion formed along an axis and several fan blades installed around said axial portion;
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each fan blade being defined as having two surfaces positioned relative to said axis; the rotation of said fan blades causing fluid flow through said blades, said fluid flow causing centrifugal force; and means for producing centripetal force to balance said centrifugal force; said centripetal force producing means including at least one fin extending from at least one of said surfaces of said fan blade; each fin having an inner surface and an outer surface relative to the axis; and the length of the fin measured along the outer surface being shorter than the length of the fin measured along the inner surface for producing said centripetal force. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An axial-flow fan having a axial portion formed along an axis and several fan blades installed around said axial portion;
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each fan blade being defined as having two surfaces positioned relative to said axis; the rotation of said fan blades causing fluid flow through said blades, said fluid flow causing centrifugal force; and means for producing centripetal force to balance said centrifugal force; said means for producing centripetal force including at least one fin on at least one surface of said fan blade; each fin having a front end and a rear end relative to the direction of rotation; and said front end and said rear end being the same distance from said axis for providing parallel fluid flow relative to said axis. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification