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US 2012/0057971 A1Published application
Centrifugal blower
AssigneesDenso Corporation, Nippon Soken, Inc.
InventorsYasushi Mitsuishi, Masaharu Sakai, Masanori Yasuda, Shouichi Imahigashi, Syunsuke Ishiguro
Life of this patent
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Abstract
A centrifugal blower provided with a spiral shaped scroll chamber where a bottom part of the scroll chamber gradually expands downward in the axial direction of the fan well along with expansion of the spiral and where a flow area gradually expands toward an air outlet from a spiral start part of the casing, the centrifugal blower having an initial slant angle θ0 at the spiral start part of the bottom part of the scroll chamber of a range of angle of 5.2° to 27.5° or setting a backflow prevention rib at the fan outlet.
Claims13
A centrifugal blower which is provided with
- a multi-blade fan comprised of a large number of blades arranged in a circumferential direction at fixed intervals to form a fan wheel and of an air inlet provided upward in an axial direction of the fan wheel, the multi-blade fan having a fan outlet angle of the multi-blade fan in the range of an angle of 20° to 75° and having a fan wheel diameter in the range of 0.05 to 0.15D when an outside diameter of the multi-blade fan is D, and with
- a scroll chamber surrounded, around the multi-blade fan, by a spiral shaped casing which has an expansion angle of the spiral of an angular range of 2° to 6° from a spiral start part as the starting point, the spiral shaped scroll chamber having a chamber bottom part of the scroll chamber which gradually expands downward in the axial direction together with the expansion of the spiral and having a flow area which gradually increases toward an air outlet from the spiral start part,
- an initial slant angle θ0 downward in the axial direction at the spiral start part of the chamber bottom part being a range of angle of 5.2° to 27.5°.
A centrifugal blower which is provided with
- a multi-blade fan comprised of a large number of blades arranged in a circumferential direction at fixed intervals to form a fan wheel and an air inlet provided upward in an axial direction of the fan wheel, the multi-blade fan having a fan outlet angle of the multi-blade fan in the range of an angle of 20° to 75° and having a fan wheel diameter in the range of 0.05 to 0.15D when an outside diameter of the multi-blade fan is D, and with
- a scroll chamber surrounded, around the multi-blade fan, by a spiral shaped casing which has an expansion angle of the spiral of an angular range of 2° to 6° from a spiral start part as a start point, the spiral shaped scroll chamber having a chamber bottom part of the scroll chamber which gradually expands downward in the axial direction together with the expansion of the spiral and having a flow area which gradually increases toward the air outlet from the spiral start part,
- a backflow prevention rib being arranged at the scroll chamber at a top end of the fan outlet and with an angle formed from the spiral start part to the circumferential direction centered at the axis of the fan wheel of near 0° to 45° in range,
- a maximum width of the backflow prevention rib being made 0.1 to 0.3h1 in range with respect to a fan outlet length hi measured from the top end of the fan outlet downward in the axial direction,
- the backflow prevention rib being provided separated by a predetermined distance from the fan outlet.
2 more elements
A centrifugal blower which is provided with
- a multi-blade fan comprised of a large number of blades arranged in a circumferential direction at fixed intervals to form a fan wheel and an air inlet provided upward in an axial direction of the fan wheel, the multi-blade fan having a fan outlet angle of the multi-blade fan in the range of an angle of 20° to 75° and having a fan wheel diameter in the range of 0.05 to 0.15D when an outside diameter of the multi-blade fan is D, and with
- a scroll chamber surrounded, around the multi-blade fan, by a spiral shaped casing which has an expansion angle of the spiral of an angular range of 2° to 6° from a spiral start part as a start point, the spiral shaped scroll chamber having a chamber bottom part of the scroll chamber which gradually expands downward in the axial direction together with the expansion of the spiral and having a flow area which gradually increases toward the air outlet from the spiral start part,
- a backflow prevention rib being arranged at the scroll chamber at a top end of the fan outlet in a range from 45° (−45°) to one side of the circumferential direction to 45° (+45°) to the other side of the circumferential direction from the spiral start part as the starting point (0°) centered about the axis of the fan wheel,
- a maximum width of the backflow prevention rib being made 0.1 to 0.3h1 in range with respect to a fan outlet length h1 measured from the top end of the fan outlet downward in the axial direction,
- the backflow prevention rib being provided separated by a predetermined distance from the fan outlet.
2 more elements
Dependencies are inferred from the claim text.