Patent ID: 6077033
Filing Date: 2000-06-20
Classification: F04D

Abstract:
A portable air-blowing working machine, comprising:a prime mover having a rotatable output drive shaft;a centrifugal first-stage air-blowing section driven by said rotatable output drive shaft for drawing in external air and increasing the velocity and pressure thereof, said first-stage air-blowing section comprising an air-intake port for drawing in said external air and an outer circumferentially extending volute chamber having a plurality of air-discharge outlets adjacent the outer circumferential portion thereof;a centrifugal second-stage air-blowing section driven by said output drive shaft for receiving air discharged from said first-stage air-blowing section and further increasing the velocity and pressure thereof, said second-stage air-blowing section having an air-intake port for receiving said air from said first-stage air-blowing section;an air-blowing passage having a plurality of inlet portions respectively positioned adjacent said plurality of air-discharge outlets of said first-stage air-blowing section and at least one air-discharge portion positioned adjacent to said air-intake port of said second-stage air-blowing section; andan air-discharge outlet port for discharging air from said second-stage air-discharge section to the atmosphere.