Importance

Loading Importance Indicators...

Abstract

A motor and fan apparatus a centrifugal fan including a generally circular impeller having a plurality of generally radial vanes. The apparatus also includes a common shaft on which the impeller and the rotor are mounted in axially spaced relation. A circular pan shaped cover encloses the impeller and has a centrally disposed inlet and a wall disposed around the periphery of the impeller in spaced relationship from the periphery of the impeller. A fluid barrier is disposed axially adjacent to the impeller. The barrier and the cover collectively direct fluid flow from the periphery of the impeller in an axial direction parallel to the shaft. The apparatus includes a housing disposed axially adjacent to the barrier. The housing has a generally toroidal shaped part and a smaller generally circular shaped part, the generally toroidal shaped part and the generally circular shaped part are disposed in generally concentric relationship. The generally circular part includes a socket for a first bearing that supports the shaft, the housing including a plurality of generally radially extending curved vanes depending from the toroidal shaped part and abutting the barrier member. The generally radially extending vanes are disposed at intervals about the angular extent of the generally toroidal shaped part whereby fluid flow from the periphery of the impeller continues up and around the barrier member, intermediate adjacent vanes and upwards intermediate the generally circular part and the generally toroidal shaped part. The generally toroidal shaped part has a cross section that has the maximum height at the periphery thereof and a surface intermediate adjacent vanes which slopes upward at all parts thereof which are progressively closer to the geometric center thereof. In some forms of the invention the surfaces intermediate adjacent vanes slopes upward at a progressively increasing rate at all parts thereof which are progressively closer to the geometric center thereof and at least two spokes couple the generally circular shaped part and the generally toroidal shaped part and the spokes are joined to two of the vanes.

Loading the Abstract Image...

First Claim