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Miniature heat dissipating fans with minimized thickness
| Details |
Inventors: Horng, Alex;
Assignee: Sunonwealth Electric Machine Industry Co., Ltd. (TW)
Primary Examiner: Look; Edward K.
Assistant Examiner: McDowell; Liam
Attorney, Agent or Firm: Stevens, Davis, Miller & Mosher, L.L.P.
A heat dissipating fan includes a casing, a stator seat, a fan wheel, and a lid. The casing includes a compartment for receiving the fan wheel, and a bottom wall that defines the compartment has an axle tube formed thereon. The casing further includes an air outlet defined in an end edge thereof and communicated with the compartment. The fan wheel includes a number of blades and an axle that is rotatably received in the axle tube. The lid is engaged on top of the casing and includes an air inlet. Each blade includes an upper section extended beyond the air inlet, while a lower section of each blade is below the lid. When the fan wheel rotates, ambient air is driven into the casing via the air inlet of the lid to carry heat in the casing away via the air outlet of the casing. The heat dissipating fan may drive more air by increasing an active area of the blades with reduced noise. |
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DETAILED DESCRIPTION It is a primary object of the present invention to provide an improved miniature heat dissipating fan with minimized thickness that has an increased blade area in a limited space to increase the amount of air driven, thereby improving the cooling effect.
It is another object of the present invention to provide an improved miniature heat dissipating fan with minimized thickness that may drive more air and reduce noise during rotation of the blades.
It is a further object of the present invention to provide an improved miniature heat dissipating fan with minimized thickness that may provide better convection effect.
In accordance with the present invention, a heat dissipating fan comprises a casing, a stator seat, a fan wheel, and a lid.
The casing includes a compartment for receiving the fan wheel, and a bottom wall that defines the compartment has an axle tube formed thereon.
The casing further includes an air outlet defined in an end edge thereof and having an appropriate shape.
The stator seat is mounted to the axle tube and includes polar plates, a circuit board, and a coil seat mounted thereon.
The fan wheel includes a number of blades and an axle that is rotatably received in the axle tube.
The lid is engaged on top of the casing and includes an air inlet.
Each blade includes an upper edge partially extended beyond the air inlet, while the remaining portion thereof is below the lid.
The upper edge inclines at an appropriate angle.
Since the upper section of each blade extends beyond the lid, the computer housing and the lid may have a larger gap therebetween for ambient air to enter the air inlet of the lid via the larger gap.
In addition, each blade of the fan wheel includes an upper section and a lower section.
The upper section of each blade is connected to the fan wheel at an arcuate end edge that extends in an angle with an axial direction of the axle.
The lower section of each blade is connected to the fan wheel at a rectilinear end edge that extends along a direction parallel to the axial direction of the axle
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