Centrifugal Blower
First Claim
1. A centrifugal blower having:
- an impeller;
a casing that houses said impeller and forms a spiral flow passage that surrounds a radial direction outside of said impeller; and
a driving device that rotates said impeller about an axis, whereinsaid impeller has;
a disk shaped bottom plate that is rotated about said axis by said driving device;
a plurality of blades provided so as to project in said axial direction on a same circumference of said bottom plate; and
a substantially annular plate shape shroud that has said blades interposed between it and said bottom plate, and that is disposed concentric with said bottom plate, and that connects end sections of the respective blades,said shroud has;
an inclined section that comes closer to said bottom plate moving from a radial direction inside to a radial direction outside; and
a shroud side barrier that rises from a position on the radial direction outside of said inclined section towards a side opposite to said bottom plate, andsaid casing has;
a bell-mouth that opposes an area on a radial direction inside of an inner periphery of said shroud; and
a casing side barrier that projects from a position on the radial direction outside of said bell-mouth to an area between said inner periphery of said shroud and said shroud side barrier.
1 Assignment
0 Petitions
Accused Products
Abstract
An object is to provide a centrifugal blower with reduced noise. The centrifugal blower is provided with: an impeller; a casing that houses the impeller and forms a spiral flow passage that surrounds a radial direction outside of the impeller; and a driving device that rotates the impeller about an axis. The impeller has: a bottom plate; a plurality of blades provided on a same circumference of the bottom plate; and a substantially annular plate shape shroud that has the blades interposed between it and the bottom plate, and that is disposed concentric with the bottom plate, and that connects end sections of the respective blades. The shroud has: an inclined section that comes closer to the bottom plate moving from a radial direction inside to a radial direction outside; and a shroud side barrier that rises from a position on the radial direction outside of the inclined section towards a side opposite to the bottom plate. The casing is provided with a bell-mouth that opens from a radial direction inside of the shroud to a radial direction outside, and a casing side barrier that projects to an area between the inner periphery of the shroud and the shroud side barrier.
38 Citations
16 Claims
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1. A centrifugal blower having:
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an impeller; a casing that houses said impeller and forms a spiral flow passage that surrounds a radial direction outside of said impeller; and a driving device that rotates said impeller about an axis, wherein said impeller has;
a disk shaped bottom plate that is rotated about said axis by said driving device;a plurality of blades provided so as to project in said axial direction on a same circumference of said bottom plate; and a substantially annular plate shape shroud that has said blades interposed between it and said bottom plate, and that is disposed concentric with said bottom plate, and that connects end sections of the respective blades, said shroud has;
an inclined section that comes closer to said bottom plate moving from a radial direction inside to a radial direction outside; anda shroud side barrier that rises from a position on the radial direction outside of said inclined section towards a side opposite to said bottom plate, and said casing has;
a bell-mouth that opposes an area on a radial direction inside of an inner periphery of said shroud; anda casing side barrier that projects from a position on the radial direction outside of said bell-mouth to an area between said inner periphery of said shroud and said shroud side barrier. - View Dependent Claims (2, 5, 6, 7, 8, 11, 15)
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3. A centrifugal blower having:
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an impeller; a casing that houses said impeller and forms a spiral flow passage that surrounds a radial direction outside of said impeller; and a driving device that rotates said impeller about an axis, wherein said impeller has;
a disk shaped bottom plate that is rotated about said axis by said driving device;a plurality of blades provided so as to project in said axial direction on the same circumference of said bottom plate; and a substantially annular plate shape shroud that has said blades interposed between it and said bottom plate, and that is disposed concentric with said bottom plate, and that connects end sections of the respective blades, and said casing has;
a bell-mouth that opposes an area on the radial direction inside of an inner periphery of said shroud; anda wind shielding plate that rises from an area in the vicinity of a start point of said spiral flow passage of said bell-mouth toward the outside of said casing. - View Dependent Claims (10, 12, 13, 16)
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4. A centrifugal blower having:
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an impeller; a casing that houses said impeller and forms a spiral flow passage that surrounds a radial direction outside of said impeller; and a driving device that rotates said impeller about an axis, wherein said impeller has;
a disk shaped bottom plate that is rotated about said axis by said driving device;a plurality of blades provided so as to project in said axial direction on a same circumference of said bottom plate; and a substantially annular plate shape shroud that has said blades interposed between it and said bottom plate, and that is disposed concentric with said bottom plate, and that connects end sections of the respective blades, and said casing has;
a bell-mouth that opposes an area on the radial direction inside of an inner periphery of said shroud; anda backflow suppressing wall that projects from the radial direction outside of said bell-mouth towards said bottom plate, and that surrounds the radial direction outside of said shroud. - View Dependent Claims (14)
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9. A centrifugal blower having:
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an impeller; a casing that houses said impeller and forms a spiral flow-passage that surrounds a radial direction outside of said impeller; and a driving device that rotates said impeller about an axis, wherein said impeller has;
a disk shaped bottom plate that is rotated about said axis by said driving device;a plurality of blades provided so as to project in said axial direction on a same circumference of said bottom plate; and a substantially annular plate shape shroud that has said blades interposed between it and said bottom plate, and that is disposed concentric with said bottom plate and that connects end sections of the respective blades, said casing has;
a bell-mouth that opposes an area on the radial direction inside of an inner periphery of said shroud, andsaid shroud has a shape that inclines with respect to said axis so as to come close to said bottom plate when moving from the radial direction inside toward the radial direction outside, and in an area on the radial direction outside of said shroud, a plane that faces the radial direction inside is an inclined plane that inclines at a predetermined angle with respect to said axis, and in an area on the radial direction inside of said shroud, a plane that faces the radial direction inside has;
a first convex curved plane that gradually projects from an inner periphery of said shroud toward the radial direction inside; anda second convex curved plane that smoothly connects said first convex curved plane and said inclined plane.
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Specification