Fan blade
AssigneeRevcor, Inc.
InventorLing-Zhong Zeng
Life of this patent
Estimating the term…
Abstract
The present invention employs improved fan blade shapes to improve fan blade performance in one or more manners (i.e., increased fan efficiency, lower fan noise, greater fluid moving capability, and the like). In some embodiments, the fan blade has a front side, a rear side, an inner attachment portion, an outer edge, a curved leading edge and a curved trailing edge. The outer edge can define an arc between a forward position and a rearward position of the fan blade. In some embodiments, the leading edge extends outward and intercepts the arc of the outer edge at the forward position, and the trailing edge extends outward to the rearward position. Various angles, lengths, and other dimensions of the blade can have selected values to produce superior fan performance.
Claims103
A fan blade for rotation about an axis, the fan blade comprising:
- a blade body;
- a front side;
- a back side;
- an arcuate concave leading edge, the arcuate leading edge extending along a first arcuate line;
- an outer edge extending along a second line, at a free end of the blade body, the outer edge at least partially defining a radius of the fan blade extending from the axis;
- a first point at which the first and second lines intersect;
- a second point on the concave leading edge at a location substantially equal to 0.65 times the radius of the fan blade;
- an angle defined between a first line extending from the axis to the first point and a second line extending from the axis to the second point, the angle being between 15 and 35 degrees.
The fan blade as claimed in claim 68, wherein the camber-to-chord ratio of the cross-sectional shape is between 3.0% and 4.0%.
A fan blade for rotation about an axis, the fan blade comprising:
- an arcuate concave leading edge;
- the arcuate concave leading edge extending along a first arcuate line;
- an outer edge extending along a second line, at a free end of the fan blade, the outer edge at least partially defining a radius of the fan blade extending from the axis;
- a first point at which the first and second lines intersect;
- and
- a second point on the concave leading edge at a location substantially equal to 0.65 times the radius of the fan blade, the arcuate concave leading edge having a camber-to-chord ratio between the first and second points of between 0.08 and 0.17.
The fan blade as claimed in claim 59, further comprising:
- a concave front surface;
- a convex rear surface;
- and
- a cross-sectional shape defined at a cross-section of the blade taken at 0.65 times the radius of the fan blade, the cross-sectional shape having a camber-to-chord ratio of between 4.0% and 6.5%.
A fan blade for rotation about an axis, the fan blade comprising:
- an arcuate concave leading edge;
- an arcuate concave trailing edge, the arcuate convex trailing edge extending along a first arcuate line;
- an outer edge extending along a second line, at a free end of the fan blade, the outer edge at least partially defining a radius of the fan blade extending from the axis;
- a first point at which the first and second lines intersect;
- a second point on the convex trailing edge at a location substantially equal to 0.65 times the radius of the fan blade;
- an angle defined between a first line extending from the axis to the first point and a second line extending from the axis to the second point, the angle being between 10 and 35 degrees.
A fan blade for rotation about an axis, the fan blade comprising:
- an arcuate convex trailing edge, the arcuate convex trailing edge extending along a first arcuate line;
- an outer edge extending along a second line at a free end of the fan blade, the outer edge at least partially defining a radius of the fan blade extending from the axis;
- a first point at which the first and second lines intersect;
- and
- a second point on the convex trailing edge at a location substantially equal to 0.65 times the radius of the fan blade, the arcuate convex trailing edge having a camber-to-chord ratio between the first and second points of between 0.05 and 0.17.
A fan blade for rotation about an axis, the fan blade comprising:
- a blade body;
- a concave front surface;
- a convex rear surface;
- an arcuate concave leading edge;
- an outer edge at least partially defining a radius of the fan blade extending from the axis;
- a cross-sectional shape defined at a cross-section of the blade body taken at 0.65 times the radius of the fan blade, the cross-sectional shape having a camber-to-chord ratio of between 4.0% and 6.5%.
A fan blade for rotation about an axis, the fan blade comprising:
- a blade body;
- a concave front surface;
- a convex rear surface;
- an arcuate concave leading edge;
- an outer edge at least partially defining a radius of the fan blade extending from the axis;
- a cross-sectional shape defined at a cross-section of the blade body taken at 0.75 times the radius of the fan blade, the cross-sectional shape having a camber-to-chord ratio of between 3.5% and 7.0%.
A fan blade for rotation about an axis, the fan blade comprising:
- a blade body;
- a concave front surface;
- a convex rear surface;
- an arcuate concave leading edge;
- an outer edge at least partially defining a radius of the fan blade extending from the axis;
- a cross-sectional shape defined at a cross-section of the blade body taken at 0.85 times the radius of the fan blade, the cross-sectional shape having a camber-to-chord ratio of between 3.0% and 6.5%.
A fan blade for rotation about an axis, the fan blade comprising:
- a blade body;
- a concave front surface;
- a convex rear surface;
- an arcuate concave leading edge;
- an outer edge at least partially defining a radius of the fan blade extending from the axis;
- a cross-sectional shape defined at a cross-section of the blade body taken at 0.95 times the radius of the fan blade, the cross-sectional shape having a camber-to-chord ratio of between 2.0% and 5.5%.
Dependencies are inferred from the claim text.