Cyclonic vacuum cleaner

Abstract

A cyclonic vacuum cleaner whose components are few enough to simplify maintenance, preventing the leakage of airflow. A dust collecting container 23 includes an outer cyclonic cylinder 21 and an inner cyclonic cylinder 22 . The inner cylinder 22 is formed integrally with a vortex flow generating member 30 including outer and inner vortex flow generating portions 32 and 33 . The outer portion 32 allows dust-laden air to turn into a vortex flow falling helically along a peripheral inner surface of the outer cylinder 21 . The vortex flow is then turned upwardly on a bottom of the container 23 , turning into a vortex flow along a peripheral outer surface of the inner cylinder 22 . This vortex flow is then turned into a vortex flow along the peripheral inner surface of the inner cylinder 22 by the inner portion 33 , turned upwardly in the center of the bottom of the container 23 , passing through a mesh filter 45 and finally sucked into an air suction hole 19 of the cleaner body 1.

What is claimed:  
     
         1 . A cyclonic vacuum cleaner comprising: 
 a cleaner body, including an attachment portion;    a fan unit provided in the cleaner body;    an outer cylinder attached to the cleaner body;    an inner cylinder provided inside the outer cylinder; and    a vortex flow generating means for generating a vortex flow in said outer and inner cylinders,    wherein said inner cylinder and vortex flow generating means are provided detachably from said outer cylinder, while these outer cylinder, inner cylinder and vortex flow generating means are provided detachably from said attachment portion, and    wherein said vortex flow generating means is formed integrally with an outer vortex flow generating portion for introducing air from above to generate a vortex flow and then guiding the vortex flow into said outer cylinder and an inner vortex flow generating portion for introducing air from below to generate a vortex flow and then guiding the vortex flow into said inner cylinder.    
     
     
         2 . A cyclonic vacuum cleaner according to  claim 1 , further comprising: 
 a suction opening formed in said attachment portion for allowing the airflow generated by the fan unit to flow therethrough;    a first packing provided around said suction opening;    a connecting portion provided in said vortex flow generating means, said connecting portion communicating with said suction opening;    a second packing provided in an outer periphery of an upper portion of said vortex flow generating means,    wherein said vortex flow generating means is attached to the neighborhood of an opening of said outer cylinder, and    wherein said first packing is abutted against the connecting portion, while the second packing is abutted against both an inner surface of the opening of said outer cylinder and said attachment portion simultaneously.    
     
     
         3 . A cyclonic vacuum cleaner according to  claim 1 , wherein said inner cylinder is integrally formed with said vortex flow generating means.  
     
     
         4 . A cyclonic vacuum cleaner according to  claim 2 , wherein said inner cylinder is integrally formed with said vortex flow generating means.  
     
     
         5 . A cyclonic vacuum cleaner according to  claim 1 , wherein said attachment portion is a holder, said holder including a bottom plate, outside and inside guide walls protruding therefrom, and a guiding duct extending tangentially with respect to each of the guide walls.  
     
     
         6 . A cyclonic vacuum cleaner according to  claim 2 , wherein said attachment portion is a holder, said holder including a bottom plate, outside and inside guide walls protruding therefrom, and a guiding duct extending tangentially with respect to each of the guide walls.  
     
     
         7 . A cyclonic vacuum cleaner according to  claim 3 , wherein said attachment portion is a holder, said holder including a bottom plate, outside and inside guide walls protruding therefrom, and a guiding duct extending tangentially with respect to each of the guide walls.  
     
     
         8 . A cyclonic vacuum cleaner according to  claim 4 , wherein said attachment portion is a holder, said holder including a bottom plate, outside and inside guide walls protruding therefrom, and a guiding duct extending tangentially with respect to each of the guide walls.