CENTRIFUGAL FAN

• US 3,698,833 A
• Filed: 03/31/1971
• Issued: 10/17/1972
• Est. Priority Date: 03/31/1971
• Status: Expired due to Term

• Current Assignee: Peter L. Cann, Richard J. Duell
• Original Assignee: Peter L. Cann, Richard J. Duell
• Inventors: Cann, Peter L., Duell, Richard J.
• Primary Examiner(s): Raduazo, Henry F.
• Application Number:
  US05/129,717
• Time in Patent Office: 566 Days
• Field of Search: 415/204,206,201,219C 417/363
• US Class Current: 415/201
• CPC Class Codes: F04D 29/626 Mounting or removal of fans

Abstract

A centrifugal fan assembly including a removable orifice ring having tabs thereon, the ring being formed from the material removed in the production of the side plate of the fan housing, the diameter of the orifice ring being substantially equal to the diameter of the opening in the side plate of the fan housing, the tabs on the orifice ring being utilized to locate the orifice ring on the side plate of the fan housing.

Claims

1. A centrifugal fan assembly comprising a housing having a scroll-shaped wrapper, a first side plate associated with said wrapper, a second side plate having a circular opening therein disposed opposite said first side plate on said scroll wrapper, said second side plate having a plurality of notches formed therein communicating with the circular opening, an orifice plate having a central circular opening therein, said orifice plate comprising material removed from said second side plate to provide the circular opening therein, said orifice plate thereby having a diameter substantially equal to the diameter of the circular opening in said second side plate, said orifice plate having tabs thereon resulting from the formation of the notches in said second side plate, said tabs being adapted for engagement with said second side plate at a location circumferentially spaced from the notChes in said second side plate to position said orifice plate on said second side plate over the circular opening therein, and a fan wheel having an outer diameter larger than said orifice in said plate and less diameter than the circular opening in said second side plate mounted for rotation within said housing between said side plates.

2. A centrifugal fan assembly according to claim 1 further including support means for rotatably supporting said fan wheel within said housing, and fastening means adapted for cooperation with the notches in said side plate for securing said support means to said second side plate.

3. A centrifugal fan assembly according to claim 2 wherein said fastening means comprise:

a resilient grommet having an enlarged portion on one end thereof, internally threaded means affixed to the other end of said grommet, said grommet being adapted for insertion through the notches in said second side plate with the other end thereof projecting into said housing, said enlarged portion engaging the outer surface of said orifice plate and said second side plate; and

bolt means adapted for insertion through the center of said grommet for engagement with said threaded means, said bolt being adapted for insertion through said support means into said grommet, subsequent tightening of said bolt causing the diameter of said resilient grommet internally of said housing to expand into engagement with said orifice plate and said second side plate to secure said orifice plate and said support means on said second side plate.

4. A centrifugal fan assembly according to claim 3 wherein said first side plate is provided with an orifice therein for passage of air into said housing.