Fan wheel
AssigneeHP Intellectual Corp.
InventorEugen Schloetzer
Life of this patent
Estimating the term…
Abstract
An electric fan having an electric motor and a fan wheel connected to the electric motor. The fan wheel has a hub and fan blades extending from the hub. The fan blades include a proximal section at the hub, a distal section and a middle section. The proximal section has a flat surface at a trailing edge of the blade. The trailing edge at the distal section is curved with an angle of curvature of about 10°. The trailing edge at the middle section is curved with an angle of curvature of about 36°. When the fan wheel is rotated by the electric motor at a constant speed, air pushed by each of the fan blades is propelled at a substantially same velocity and direction from the blade measured across a radial length of the blade.
Claims17
A fan wheel comprising:
- a center section;
- and
- blades extending from the center section, each blade comprising a first section proximate a blade tip, a second section, a leading edge along the first and second sections, a trailing edge along the first and second sections, the blade tip being formed at a junction of the leading and trailing edges, wherein the first section is curved at the trailing edge with a first angle relative to a tangent to the first section at the trailing edge of between about 7°-13°, wherein the second section is curved at the trailing edge with a second angle relative to a tangent to the second section at the trailing edge of between about 33°-39°, said second section being curved upwardly from the leading edge to the trailing edge, said second section having a substantially inverted cup-like shape.
A fan wheel comprising:
- a center hub section;
- and
- blades extending from the center hub section, each blade having a leading edge and a trailing edge, a section of the blade extending from the center hub section at the trailing edge having a forward facing substantially flat surface.
An electric fan comprising:
- an electric motor;
- and
- a fan wheel connected to the electric motor, the fan wheel comprising a hub and fan blades extending from the hub, the fan blades comprising a proximal section at the hub, a distal section and a middle section, the proximal section having a flat surface at a trailing edge of the blade, the trailing edge at the distal section being curved with an angle of curvature of about 10°, and the trailing edge at the middle section being curved with an angle of curvature of about 36°, wherein when the fan wheel is rotated by the electric motor at a constant speed, air pushed by each of the fan blades is propelled at a substantially same velocity and direction from the blade measured across a radial length of the blade.
Dependencies are inferred from the claim text.