Showing papers on "Centrifugal fan published in 1972"

Scroll washer for centrifugal fans

Abstract: This invention relates to a centrifugal fan having a rotating fan wheel and means for removing centrifuged particulate matter from the interior wall of the fan scroll. A conduit, capable of carrying a fluid under pressure, is provided with a plurality of perforations so that jets of water may be applied to the inside surface of the scroll to dislodge and maintain the particulate matter in a fluidized state to enable the matter to be removed from the scroll by a suitable drain. The conduit is disposed adjacent the inner surface of the scroll and aligned substantially transversely with respect to the direction of rotation of the fan wheel.

Machine for distributing seed, fertilizer and other grain or powder masses

Abstract: An impeller for controlling the flow of grain or pulverulent materials between a container containing such materials and a centrifugal fan for distributing said materials over a wide area, the impeller feeding a predetermined quantity per revolution to the fan.

Centrifugal fan inlet and vane capacity control

Abstract: This invention relates to a centrifugal fan having an inlet cone and a rotating fan wheel, and more particularly to a centrifugal fan inlet capacity control. The capacity control consists of a plurality of spin inducing inlet vanes and means to pivotably support the vanes circumferentially around the outer wall of the inlet cone. The vanes may be pivoted in unison through their respective pivot axes which are adjacent the periphery of the inlet cone and generally parallel to the cone outer wall. As the vanes are pivoted away from the outer inlet cone wall, the induced spin can be thereby increased and also the volume of gas flowing through the inlet cone can be reduced.

Room air conditioner fresh air intake duct

Abstract: An elongated semi-cylindrical conduit damper rotatably supported about one end on the partition shround wall of a room air conditioner adjacent the evaporator centrifugal fan orifice with a fresh air opening in the wall aligned on one side of its axis of rotation. The conduit is biased to a first selected closed position in which a peripheral flange defining its elongated mouth is in continuous flush contact with the partition wall preventing passage of outside air through the wall opening. The conduit damper being rotatable to a second selected open position with its semi-spherical free end disposed in the path of the evaporator fan orifice so as to communicate a portion of its mouth therewith whereby the conduit provides an air flow passage connecting the suction side of the evaporator fan to the fresh air opening causing fresh air to be drawn through the conduit and the fan orifice for distribution to the room being conditioned.