Patent ID: 6951312

Claim:
An eductor-spike nozzle device for mounting through side walls of a fluidized bed jet mill to discharge a composite stream of high velocity fluid for receiving, entraining and delivering particles of material into a grinding chamber of a fluidized bed jet mill for particle to particle collisions, the eductor-spike nozzle device comprising: (a) a first cylindrical member having a first wall, said first wall including a cowl lip and defining a first hollow interior, and (b) a second cylindrical member mounted within said first hollow interior and having a second wall, said second wall (i) externally defining an annular flow path with said first wall for flow of a first stream of fluid, and said second wall including a radially protruding and roundish portion defining a fluid compressing throat region with said cowl lip, said second cylindrical member having a small diameter second end and a roundish relatively larger diameter first ends for accelerating said first low velocity stream of fluid into a first high velocity stream of fluid, and (ii) said second wall internally defining a second hollow interior for flow of a second stream of fluid for forming the composite stream of high velocity fluid with said first high velocity stream of fluid, thereby increasing a probability of the composite stream of high velocity fluid receiving and entraining the particles of material introduced into the composite stream of high velocity fluid.