Multi-blade centrifugal fan

Abstract

A multi-blade centrifugal fan, the fan arranged with a plurality of blades in round shape and equipped with an end plate mounted with a tip end of the plurality of blades, wherein the end plate is centrally mounted with protruded hub toward an air intake, and here a protruded height (Hb) of the hub is less than 0.3 times the outer diameter (Df), such that although a hub is mounted with a driving motor, an overall structural size is miniaturized to minimize a flow rate loss and to prevent a remarkable fan performance decrease.

What is claimed is:  
     
         1 . A multi-blade centrifugal fan, the fan arranged with a plurality of blades in round shape and equipped with an end plate mounted with a tip end of the plurality of blades, wherein the end plate is centrally mounted with protruded hub toward an air intake, and here a protruded height (Hb) of the hub is less than 0.3 times the outer diameter (Df).  
     
     
         2 . The fan as defined in  claim 1 , wherein the hub is a conical shape having a narrow diameter at air intake.  
     
     
         3 . The fan as defined in  claim 1 , wherein the hub is shaped of a cylindrical form.  
     
     
         4 . The fan as defined in  claim 1 , wherein the hub is formed at lateral surfaces thereof with a plurality of holes for cooling the heat of a motor disposed at a space of the hub.