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Fan stator assembly for heat exchanger

  • US 4,971,143 A
  • Filed: 05/22/1989
  • Issued: 11/20/1990
  • Est. Priority Date: 05/22/1989
  • Status: Expired due to Fees
First Claim
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1. Heat exchanger and fan assembly comprising:

  • a heat exchanger coil having a flat, generally rectangular face having a rectangular perimeter and a plurality of fins that define air passages therebetween which pass through the heat exchanger generally perpendicular to said flat face;

    an axial flow propeller fan positioned to face said heat exchanger flat face with an axis which passes through the heat exchanger, including a hub, a plurality of blades that radiate from the hub, and drive means for rotating the hub and blades, said blades having a pitch selected to impart a generally axial flow to air when the fan rotates, the flow also having a swirl component in the circumferential direction;

    shroud means over said fan and heat exchanger for guiding air into said fan to be forced thereby through the heat exchanger; and

    a generally rectangular stator of a predetermined thickness mounted against said flat face of said heat exchanger and substantially coextensive therewith, including a plurality of radial blades that extend to the perimeter of the heat exchanger face and have a pitch complementary to that of the fan blades for bending the swirl component of air flow at said heat exchanger face generally toward the axial direction so that the air enters the heat exchanger passages more directly;

    and wherein said fan and said stator are spaced apart a distance that is significantly greater than the thickness of the stator, such that the air flow from the fan has an opportunity to diffuse prior to encountering the stator, thus reducing its swirl component at the stator.

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