Centrifugal fan with airfoil vanes in annular volute envelope
First Claim
1. A centrifugal blower comprising(a) an impeller mounted to rotate on an axis, said impeller comprising a plurality of rearwardly curved blades which draw air in through a central inlet and force air radially outward, into an annular envelope around said impeller, and out of an annular discharge from said envelope, and(b) a plurality of airfoil vanes positioned in said annular envelope;
- said airfoil vanes being positioned to form at least two stages axially displaced with respect to each other;
said vanes being angled with respect to airflow entering said envelope to turn and diffuse airflow in said envelope, converting swirl energy into pressure,said blower having a blade chord Reynolds number of 40,000-200,000.
2 Assignments
0 Petitions
Accused Products
Abstract
A rearwardly curved centrifugal blower having an annular envelope around the impeller, so that the rotating impeller draws air in through a central inlet and forces it radially outward into the envelope and out of an annular discharge. Multiple airfoil vanes are positioned in the annular envelope, in two axially displaced stages. The vanes are angled to turn and diffuse airflow entering the envelope.
111 Citations
8 Claims
-
1. A centrifugal blower comprising
(a) an impeller mounted to rotate on an axis, said impeller comprising a plurality of rearwardly curved blades which draw air in through a central inlet and force air radially outward, into an annular envelope around said impeller, and out of an annular discharge from said envelope, and (b) a plurality of airfoil vanes positioned in said annular envelope; - said airfoil vanes being positioned to form at least two stages axially displaced with respect to each other;
said vanes being angled with respect to airflow entering said envelope to turn and diffuse airflow in said envelope, converting swirl energy into pressure,said blower having a blade chord Reynolds number of 40,000-200,000. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- said airfoil vanes being positioned to form at least two stages axially displaced with respect to each other;
Specification