| 摘要 |
In the apparatus of the present invention, air flow control inserts are disposed within the formed tube air outlet manifolds of a heat exchanger of the counterflow type wherein the manifolds have openings communicating with air passages of the heat exchanger core. Each insert is generally tubular in shape, having an intermediate cylindrical tube portion, and larger diameter end portions, which are substantially equal to the diameter of an outlet manifold. Each intermediate insert portion is initially provided with a plurality of peripheral, longitudinally equally spaced slots, equal in number to the number of openings in a manifold, and of such circumferential lengths as to subtend angles substantially equal to the angles subtended by the manifold openings. Tube material adjacent the slots is then urged inwardly of the tube to form apertures and adjacent louvers. The tube inserts are positioned within the air outlet manifolds with their longitudinal axes coinciding with the longitudinal axes of the manifolds to define air chambers therebetween, while the louvers are each disposed opposite a manifold opening. The louvers gradually direct air flow from the air chambers into the apertures to substantially reduce the pressure drop the air would ordinarily experience merely abruptly dumping into the manifolds from the openings. The size of each aperture is adjustable, and determined by the extent to which each adjacent louver is inwardly urged within the insert. Adjustment of the individual aperture sizes with the louvers regulates air flow through the apertures and adjacent manifold openings, and can be utilized to provide for a more uniform air flow distribution throughout the heat exchanger core air passages. According to another aspect of the invention, inserts are provided which are positionable within the air outlet manifolds, and provide for rapid movement of air flowing from the manifold openings in a circular direction within, and then axially out of the manifolds to distribute temperature more uniformly throughout the manifolds, thus reducing core thermal stresses.
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