CENTRIFUGAL FAN ASSEMBLY

• US 3,743,439 A
• Filed: 04/30/1971
• Issued: 07/03/1973
• Est. Priority Date: 04/30/1971
• Status: Expired due to Term

• Current Assignee: Peter L. Cann
• Original Assignee: Peter L. Cann
• Inventors: Cann, Peter L.
• Primary Examiner(s): Raduazo, Henry F.
• Application Number:
  US05/139,070
• Time in Patent Office: 795 Days
• Field of Search: 415/204,205,203,206,219C 29/156.8,156.8CF 220/5R,67
• US Class Current: 415/206
• CPC Class Codes: F04D 29/424 Double entry casings

Abstract

A centrifugal fan assembly including a housing having side plates with flanges formed thereon, the flanges providing recesses for insertion therein of the housing wrapper, the wrapper being secured in the flange recesses by deformation of portions of the flanges into the plane of the wrapper.

Claims

1. A centrifugal fan assembly including a motor having a rotatable shaft, a fan wheel mounted on the shaft, and a fan housing for admitting input air to the fan wheel and for directing discharge air from the fan wheel, said fan housing comprising:

a scroll-shaped wrapper wrapped substantially around the fan wheel, said wrapper having spaced ends forming part of a discharge port for said discharge air and side portions having edges spaced to receive the fan wheel therebetween; and

a pair of planar, parallel side plates attached to the side portions of said wrapper for cooperating with said wrapper to substantially enclose said fan wheel and to form a discharge port for said fan wheel, at least one of said side plates having a central opening for admitting air to the fan wheel, and each of said side plates comprising;

an end portion extending between the spaced ends of said wrapper to form in conjunction with the end portion of the other side plate and with the spaced ends of said wrapper, a discharge port for air discharged from the fan wheel; and

a peripheral flange for receiving a side edge of said wrapper, said flange including a first section extending outwardly from the fan wheel in one direction normal to the plane of the side plate and a second section bent back inwardly toward the fan wheel over the first section and extending parallel to the first section to form a recess for receiving said side edge of said wrapper;

each first and second section of said flange and the side edge portion of the wrapper received in the recess having cooperating pairs of discontinuous deformations transverse to the flange and to the wrapper for attaching each side plate to the wrapper, one deformation of each pair of deformations extending into the other deformation of the pair to form an interlocking connection.