High speed, low torque axial flow fan

Claim 2

An axial flow fan characterized by operating at high speed and low torque for producing airflow through an engine compartment of a vehicle comprising: a hub rotatable about an axis; an annular band concentric with the hub and spaced radially outward from the hub; a plurality of fan blades distributed circumferentially around the hub and extending radially from the hub to the annular band, wherein each blade has substantially the parameters defined by Blade Section Stagger Radius/Tip Radius ξ Solidity r = R/R tip Degrees σ 38.5% 76.0 0.522 46.6% 72.0 0.490 52.7% 71.5 0.470 57.8% 70.7 0.452 63.0% 71.1 0.432 68.1% 72.0 0.410 73.3% 72.9 0.385 78.4% 73.9 0.359 83.6% 74.4 0.332 88.7% 75.1 0.302 93.9% 76.7 0.267 100.0% 78.6 0.225 wherein r is the non-dimensional radius from the rotational axis, (r=R/R tip with R being the radius from the rotational axis and R tip being the radius from the rotational axis at the blade tip), ξ is the stagger angle of the blade at the radial distance R, and σ is the solidity C/S, with C being chord length and S being the circumferential blade spacing at the radial distance R.

Claim 3

The fan according to claim 1 , wherein said blades are distributed evenly about the hub.

Claim 4

The fan according to claim 1 , wherein said hub, said blades and said band are made integral.

Claim 5

The fan according to claim 1 , wherein five blades are provided.

Claim 6

The fan according to claim 1 , wherein a diameter of the fan is in a range of about 420 to 520 mm.

Claim 7

An axial flow fan characterized by operating at high speed and low torque for producing airflow through an engine compartment of a vehicle comprising: a hub rotatable about an axis; an annular band concentric with the hub and spaced radially outward from the hub; a plurality of fan blades distributed circumferentially around the hub and extending radially from the hub to the annular band, wherein each blade has substantially the parameters defined by Radius Stagger Chord Thickness R ξ C T Camber mm Degrees mm % of Chord θ 85.0 76.0 55.80 0.105 15.00 102.8 72.0 63.25 0.0928 15.00 116.2 71.5 68.59 0.0836 15.00 127.5 70.7 72.39 0.0773 15.00 138.9 71.1 75.33 0.0725 15.00 150.3 72.0 77.43 0.0687 15.00 161.6 72.9 78.29 0.0654 15.00 173.0 73.9 78.02 0.063 15.00 184.3 74.4 76.94 0.0612 15.00 195.7 75.1 74.37 0.0606 15.00 207.0 76.7 69.40 0.0618 15.00 220.5 78.6 62.33 0.0715 15.00 wherein R is the non-dimensional radius from the rotational axis, ξ is the stagger angle of the blade at the radial distance R, C is the chord length at the radial distance R, T is the thickness as a percent of chord C, and θ is the chamber angle of the blade at the radial distance R.

Claim 8

An axial flow fan characterized by operating at high speed and low torque for producing airflow through an engine compartment of a vehicle comprising: a hub rotatable about an axis; an annular band concentric with the hub and spaced radially outward from the hub; a plurality of fan blades distributed circumferentially around the hub and extending radially from the hub to the annular band, wherein each blade has substantially the parameters defined by Radius Stagger Chord Thickness R ξ C T Camber mm Degrees mm % of Chord θ 85.0 76.0 55.80 0.105 15.00 102.8 72.0 63.25 0.0928 15.00 116.2 71.5 68.59 0.0836 15.00 127.5 70.7 72.39 0.0773 15.00 138.9 71.1 75.33 0.0725 15.00 150.3 72.0 77.43 0.0687 15.00 161.6 72.9 78.29 0.0654 15.00 173.0 73.9 78.02 0.063 15.00 184.3 74.4 76.94 0.0612 15.00 195.7 75.1 74.37 0.0606 15.00 207.0 76.7 69.40 0.0618 15.00 220.5 78.6 62.33 0.0715 15.00 wherein R is the non-dimensional radius from the rotational axis, ξ is the stagger angle of the blade at the radial distance R, C is the chord length at the radial distance R, T is the thickness as a percent of chord C, and θ is the chamber angle of the blade at the radial distance R.

Claim 9

The fan according to claim 6 , wherein said blades are distributed evenly about the hub.

Claim 10

The fan according to claim 6 , wherein said hub, said blades and said band are made integral.

Claim 11

The fan according to claim 6 , wherein five blades are provided.

Claim 12

The fan according to claim 6 , wherein a diameter of the fan is in a range of about 420 to 520 mm.