Centrifugal type blower
AssigneeDenso Corporation
InventorsChie Watanabe, Hideki Seki
Life of this patent
Estimating the term…
Abstract
A centrifugal-type blower includes a shaft, a fan, and a casing. The casing includes an inlet, an air passage, and a side wall part. A first distance from a center of the fan to the wall part at an inlet side end portion in a radial direction of the fan gradually increases from a volute start part to a volute end part. A second distance from the center to the wall part at any position thereof from an intermediate position to a counter-inlet side end portion in the radial direction is larger than the first distance within a first range. The second distance gradually decreases from the volute start part to a predetermined position. The second distance has the same length as the first distance within a second range.
Claims5
A centrifugal-type blower comprising:
- a rotatable shaft;
- a centrifugal-type multiblade fan having a plurality of blades around the rotatable shaft;
- and
- a casing having an involuted shape and accommodating the fan, the casing including:
- a volute start part and a volute end part of the involuted shape;
- an inlet for air on one end side of the casing in an axial direction of the rotatable shaft;
- an air passage on an outer circumferential side of the fan;
- and
- a side wall part radially outward of the fan, wherein:
- the side wall part, the fan, the volute start part, and the volute end part define the air passage;
- the side wall part includes an inlet side end portion on a side of the inlet, a counter-inlet side end portion on an opposite side from the inlet, and an intermediate position between the inlet side end portion and the counter-inlet side end portion in the axial direction of the rotatable shaft;
- a first distance from a center of the fan to the side wall part at the inlet side end portion thereof in a radial direction of the fan gradually increases from the volute start part to the volute end part in a rotational direction of the fan;
- a second distance from the center to the side wall part at any position thereof from the intermediate position to the counter-inlet side end portion in the radial direction of the fan is larger than the first distance within a first range from the volute start part to a predetermined position, which is located halfway from the volute start part to the volute end part, in the rotational direction of the fan except the predetermined position;
- the second distance gradually decreases from the volute start part to the predetermined position;
- and
- the second distance has a same length as the first distance within a second range from the predetermined position to the volute end part in the rotational direction of the fan.
Dependencies are inferred from the claim text.