Quieter centrifugal blower with suppressed BPF tone
AssigneesDENSO International America, Inc., Denso Corporation
InventorsHiroyuki Hayashi, Justin Black, Prakash Thawani, Melissa Buczek, Jie Zeng
Life of this patent
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Abstract
A centrifugal blower assembly including a ring-shaped planar portion and a sloped guide surface. The ring-shaped planar portion defines a central aperture at which a centrifugal fan is seated. The ring-shaped planar portion is elevated relative to a lower surface of a scroll casing. The sloped guide surface is between the ring-shaped planar portion and the lower surface of the scroll casing. The sloped guide surface slopes towards the lower surface, and extends in a downstream direction towards a partition of the scroll casing at a scroll starting position of the scroll casing.
Claims20
A centrifugal blower assembly comprising:
- a ring-shaped planar portion defining a central aperture at which a centrifugal fan is seated, the ring-shaped planar portion is elevated relative to a lower surface of a scroll casing;
- and
- a sloped guide surface between the ring-shaped planar portion and the lower surface of the scroll casing, the sloped guide surface sloping towards the lower surface, and extending in a downstream direction towards a partition of the scroll casing at a scroll starting position of the scroll casing.
A centrifugal blower assembly comprising:
- a ring-shaped planar portion defining a central aperture at which a centrifugal fan is seated, the ring-shaped planar portion is elevated relative to a lower surface of a scroll casing;
- and
- a sloped guide surface extending from the ring-shaped planar portion towards the lower surface of the scroll casing, the sloped guide surface sloping towards the lower surface and extending in a downstream direction to a partition of the scroll casing at a scroll starting position of the scroll casing, the sloped guide surface increases in width in the downstream direction.
A centrifugal blower assembly comprising:
- a centrifugal fan defining an air inlet at a center of the centrifugal fan, a plurality of air outlets at an outer periphery of the centrifugal fan, and a plurality of blades at the air outlets;
- a scroll casing housing the centrifugal fan and including:
- a scroll starting position, a scroll ending position, and an air passage extending between the scroll starting and ending positions, the scroll ending position is downstream from the scroll starting portion relative to airflow through the scroll casing;
- an air outlet extending from the scroll ending portion;
- a partition between the scroll starting position and the air outlet;
- a ring-shaped planar portion defining a central aperture at which the centrifugal fan is seated, the ring-shaped planar portion is elevated relative to a lower surface of the scroll casing;
- and
- a sloped guide surface adjacent to the ring-shaped planar portion and extending in a downstream direction to the partition, the sloped guide surface sloping downward away from the ring-shaped planar portion towards the lower surface.
Dependencies are inferred from the claim text.