JOSEPH H HOFFMAN
Engineering in Norwood, MA
License number
Massachusetts 32208
Issued Date
May 3, 1985
Expiration Date
Jun 30, 2006
Type
Mechanical Engineer
Address
Address
Norwood, MA 02062
Professional information
Centrifugal Fan, Shaft, Plate And Hub Assembly
US Patent:
4173429, Nov 6, 1979
Filed:
Dec 5, 1977
Appl. No.:
5/857483
Inventors:
Joseph H. Hoffman - Norwood MA
Daniel G. Thompson - Plum Borough PA
Daniel G. Thompson - Plum Borough PA
Assignee:
Westinghouse Electric Corp. - Pittsburgh PA
International Classification:
F04D 1708
US Classification:
416184
Abstract:
A hub assembly for a centrifugal fan subjected to large transient thermal stresses is provided in which a pair of opposed hubs sandwich the inner peripheral margin of a disc-shaped fan plate, with the inner peripheral margin of the plate including a thickened ring portion to provide oppositely projecting annular shoulders at the outer periphery of the thickened ring portion, with the opposing hubs having annular recesses to receive the thickened ring portion and with the outer peripheries of the recesses in closely abutting relation with the shoulders to provide a shoulder-recess bearing area and with a plurality of fastener means extending through the hubs and through the thickened ring portion so that the shoulder-recess bearing area, which is located radially outwardly from the bearing stress areas at the bolt holes, largely receives the transient thermal stresses and therefore reduces the stress in the bolts and plate.
Double-Walled Centrifugal Fan Scroll And System Of Operation
US Patent:
4526510, Jul 2, 1985
Filed:
Mar 7, 1983
Appl. No.:
6/472628
Inventors:
Joseph H. Hoffman - Norwood MA
Steven R. Thayer - Weymouth MA
Steven R. Thayer - Weymouth MA
International Classification:
F04D 2958, F04B 2304
US Classification:
415175
Abstract:
A hot gas centrifugal fan is constructed with a scroll part comprising spaced-apart walls 16 and 18 to define a hot gas passage 22 therebetween to which hot gas is conveyed when the fan is in a non-operating condition to hold the fan temperature sufficiently high to avoid unacceptable vibration brought on by thermal distortion of the fan wheel upon a re-start of the fan.