Centrifugal blower with partitioned scroll diffuser
View Patent ↗A centrifugal blower having at least one radial plane dividing its scroll into sub-sections which may vary as to cut-off points and axial and radial dimensions as well as axial displacement to meet requirements of individual application system flow paths.
1. A centrifugal blower assembly comprising:
a centrifugal impeller adapted to receive air axially and discharge the same radially throughout an outer periphery;
an electric motor connected in driving relationship with the impeller;
a scroll diffuser defining a single axial inlet opening for supplying air to the impeller, and at least one scroll section for collecting and discharging air from the impeller, and
at least one partition extending substantially in a radial plane mounted within the scroll section with an inner opening having an edge in close proximity to the periphery of the centrifugal impeller, said partition serving to divide the scroll section into at least two discrete axially separated flows for the discharge of air from the scroll section, each through a single discharge opening, said scroll section comprising at least two discrete scroll sub-sections associated respectively with said at least two axially separated flows, and each of said at least two scroll sub-sections being configured to provide different and independently optimized expansion angles.
2. A centrifugal blower assembly as set forth in claim 1 , wherein said at least two scroll sub-sections have differing configurations of their outer walls.
3. A centrifugal blower assembly as set forth in claim 2 , wherein the discharge openings of the at least two sub-sections are substantially rectangular in cross section and are arranged in adjacent end-to-end relationship to provide an elongated discharge opening.
4. A centrifugal blower assembly as set forth in claim 3 , wherein the at least two scroll sub-sections are configured with varying axial dimensions and at least one scroll sub-section is displaced axially as it approaches its discharge opening to provide for an aggregate elongated discharge opening having substantially a common longitudinal centerline.
5. A centrifugal blower assembly as set forth in claim 2 , wherein the discharge openings of the at least two sub-sections are arranged in adjacent side-by-side relationship to provide an aggregate discharge opening of substantially enlarged width.
6. A centrifugal blower assembly as set forth in claim 2 , wherein the discharge openings of the at least two sub-sections are arcuately spaced apart from one another along a scroll path.
7. A centrifugal blower assembly as set forth in claim 1 , wherein an axial dimension of at least a first one of said at least two scroll sub-sections varies as the air proceeds from the impeller to an associated discharge opening.
8. A centrifugal blower assembly as set forth in claim 7 , wherein the axial dimension of said first one of said at least two scroll sub-sections varies differently than an axial dimension of a second one of said at least two scroll sub-sections.
9. A centrifugal blower assembly as set forth in claim 1 , wherein respective centerlines of the flows through the at least two sub-sections differ.
10. A centrifugal blower assembly as set forth in claim 1 , wherein said at least two scroll sub-sections have respective cut-off points substantially at the same point circumferentially along the periphery of the impeller opening in the partition.
11. A centrifugal blower assembly as set forth in claim 1 , wherein said at least two scroll sub-sections have respective cut-off points spaced circumferentially from each other.
12. A centrifugal blower assembly as set forth in claim 1 , wherein said at least two scroll sub-sections have discharge openings with respective centerlines that are substantially parallel to each other.
13. A centrifugal blower assembly as set forth in claim 1 , wherein said at least two scroll sub-sections have discharge openings with respective centerlines that are angularly related to each other.
14. A centrifugal blower assembly as set forth in claim 1 , wherein said edge of said inner opening in said partition has a thin rounded configuration facing the impeller.
15. A centrifugal blower assembly as set forth in claim 14 , wherein said edge is inclined gradually outwardly on opposite sides from said rounded configuration to a full thickness of the partition.
16. A centrifugal blower assembly as set forth in claim 1 , wherein a flow balancing restriction is incorporated in at least one of said at least two scroll sub-sections.