Centrifugal fan assembly for an automotive vehicle
First Claim
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1. An apparatus for imparting a rotation to a volume of air entering a centrifugal blower rotatable about an axis of rotation, comprising:
- a hub;
a first annular ring having a predetermined diameter disposed around said hub and which defines a first annular region between said hub and said first annular ring;
a plurality of stationary blades disposed in said first annular region generally perpendicular to the axis of rotation of the centrifugal blower, said plurality of blades each having a leading edge and a trailing edge and defining a transition portion therebetween, each of the blades being configured to cause a volume of air to rotate a predetermined amount after said volume of air passes through said plurality of blades; and
a second annular ring disposed around said hub having a diameter greater than the diameter of the first annular ring and defining a second annular region having a plurality of blades disposed therein generally perpendicular to the axis of rotation of the centrifugal blower, each of the blades in said second annular region having a different trailing edge profile than the blades in said first annular region.
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Abstract
A centrifugal blower assembly is disclosed. The blower assembly includes a centrifugal fan driven by an electric motor and a stationary device which imparts a predetermined amount of spin to a volume of air as the air enters the centrifugal blower assembly. The device is disposed axially with respect to the axis of rotation of the fan and is secured thereto so as not to include any moving parts.
51 Citations
17 Claims
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1. An apparatus for imparting a rotation to a volume of air entering a centrifugal blower rotatable about an axis of rotation, comprising:
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a hub; a first annular ring having a predetermined diameter disposed around said hub and which defines a first annular region between said hub and said first annular ring; a plurality of stationary blades disposed in said first annular region generally perpendicular to the axis of rotation of the centrifugal blower, said plurality of blades each having a leading edge and a trailing edge and defining a transition portion therebetween, each of the blades being configured to cause a volume of air to rotate a predetermined amount after said volume of air passes through said plurality of blades; and a second annular ring disposed around said hub having a diameter greater than the diameter of the first annular ring and defining a second annular region having a plurality of blades disposed therein generally perpendicular to the axis of rotation of the centrifugal blower, each of the blades in said second annular region having a different trailing edge profile than the blades in said first annular region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An apparatus for imparting a rotation to a volume of air entering a centrifugal blower rotatable about an axis of rotation, comprising:
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a hub; a first annular ring having a predetermined diameter disposed around said hub and which defines a first annular region between said hub and said first annular ring; a second annular ring disposed around said hub having a diameter greater than the diameter of the first annular ring; a third annular ring disposed around said hub having a diameter greater than the diameter of the second annular ring; each of said annular regions including a plurality of stationary, airfoil-shaped blades disposed generally perpendicular to the axis of rotation of the centrifugal blower, said plurality of blades each having a leading edge and a trailing edge and defining a transition portion therebetween, each of the blades in said first, second and third annular regions has a different trailing edge profile, and each of the blades being configured to cause a volume of air to rotate a predetermined amount after said volume of air passes through said plurality of blades. - View Dependent Claims (16)
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17. An apparatus for imparting a rotation to a volume of air entering a centrifugal blower rotatable about an axis of rotation, comprising:
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a hub; a plurality of stationary, airfoil-shaped blades disposed generally perpendicular to the axis of rotation of the centrifugal blower, each blade of said plurality of blades having a leading edge and a trailing edge and defining a transition portion therebetween; a first annular ring having a predetermined diameter disposed around said hub and which defines a first annular region between said hub and said first annular ring and including a plurality of said blades, each blade being configured to rotate a volume of air approximately 65 degrees after said volume of air passes through said plurality of blades, said first annular region having the fewest number of blades; a second annular ring having a predetermined diameter and disposed around said hub the diameter of said second annular ring being greater than the diameter of the first annular ring and which defines a second annular region between said hub and said second annular ring, said second annular region including a plurality of blades, each blade being configured to rotate a volume of air approximately 55 degrees after said volume of air passes through said plurality of blades, the blades in said second annular region having a different trailing edge profile than in said first annular region; a third annular ring having a predetermined diameter and disposed around said hub, the diameter of said third annular ring being greater than the diameter of the second annular ring and which defines a third annular region between said hub and said third annular ring, said third annular region including a plurality of blades, each blade being configured to rotate a volume of air approximately 45 degrees after said volume of air passes through said plurality of blades, said third annular region having the greatest number of blades, the trailing edge profiles of said blades being configured differently than in said first or second annular regions; whereby the rotation imparted upon the total volume of air exiting said apparatus and entering the centrifugal blower is approximately 45 degrees.
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Specification