CENTRIFUGAL FAN AND AIR-CONDITIONING APPARATUS
A centrifugal fan and an air-conditioning apparatus are to be provided in which flow separation in a shroud-side region on a suction surface of a blade of the centrifugal fan is reduced to improve efficiency. A centrifugal fan includes a main plate, a blade connected to the main plate, and a shroud...
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Format: | Patent |
Sprache: | eng |
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Zusammenfassung: | A centrifugal fan and an air-conditioning apparatus are to be provided in which flow separation in a shroud-side region on a suction surface of a blade of the centrifugal fan is reduced to improve efficiency. A centrifugal fan includes a main plate, a blade connected to the main plate, and a shroud having an annular shape and connected to a shroud-side end of the blade that is an end opposite a main-plate-side end of the blade connected to the main plate. The centrifugal fan rotates about a rotation axis to suction a fluid through an opening of the shroud and discharge the fluid through the blade in a radial direction. The blade has a leading edge that is an edge of the blade located forward in a rotation direction and a trailing edge that is an edge opposite the leading edge and is located farther from the rotation axis than is the leading edge. The leading edge includes a recess located next to a point P4 at which a shroud inner surface of the shroud that faces the main plate is connected to the leading edge and curving inwardly from the point P4 toward the trailing edge and a projection located closer to the main plate than is the recess and projecting in the rotation direction. |
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