Filtering device for vacuum cleaner

Abstract

A filtering device for a vacuum cleaner comprises: a casing having a collecting space therein, a suction opening through which air including dust is sucked and a discharge opening through which purified air is discharged; a filter installed at the internal space of the casing, for filtering dust from air sucked through the suction opening; and a filter cleaning unit disposed to encompass an outer circumferential surface of the filter, for cleaning the filter by being rotated by a rotation force of air sucked through the suction opening. Accordingly, the filtering device can remove fine dust attached to the filter in a cleaning operation, thereby preventing a channel of the filter from being closed with the dust.

1 . A filtering device for a vacuum cleaner comprising: 
 a casing having a collecting space therein, a suction opening through which air including dust is sucked and a discharge opening through which purified air is discharged;    a filter installed at the internal space of the casing, for filtering dust from air sucked through the suction opening; and    a filter cleaning unit disposed to encompass an outer circumferential surface of the filter, for cleaning the filter by being rotated by a rotation force of air sucked through the suction opening.    
   
   
       2 . The filtering device of  claim 1 , wherein the suction opening of the casing is eccentrically formed at one side of the casing so that sucked air can be rotated in the casing.  
   
   
       3 . The filtering device of  claim 1 , wherein the filter cleaning unit comprises: 
 a rotary ring disposed to encompass an outer circumferential surface of the filter;    a blade mounted to an outer circumferential surface of the rotary ring, for rotating and lifting the rotary ring by the rotation force of air sucked through the suction opening; and    a brush mounted at an inner circumferential surface of the rotary ring, for removing dust attached to a surface of the filter by being rotated together with the rotary ring.    
   
   
       4 . The filtering device of  claim 3 , wherein the blade is integrally protruded from the outer circumferential surface of the rotary ring.  
   
   
       5 . The filtering device of  claim 4 , wherein the blade is inclined at a predetermined angle on the basis of an axial direction of the filter so that the rotary ring is lifted.  
   
   
       6 . The filtering device of  claim 5 , wherein at least two blades are formed.  
   
   
       7 . The filtering device of  claim 6 , wherein one pair of blades are formed in a diagonal direction of the rotary ring.  
   
   
       8 . The filtering device of  claim 6 , wherein several pairs of blades are formed in diagonal directions of the rotary ring.  
   
   
       9 . The filtering device of  claim 6 , wherein a plurality of blades are formed at an outer circumferential surface of the rotary ring at regular intervals.  
   
   
       10 . The filtering device of  claim 4 , wherein the blade is formed in a curved shape.  
   
   
       11 . The filtering device of  claim 3 , wherein the brushes are protruded from an inner circumferential surface of the rotary ring toward the center of the rotary ring at regular intervals.  
   
   
       12 . The filtering device of  claim 3 , wherein the brushes are successively protruded from the entire inner circumferential surface of the rotary ring toward the center of the rotary ring.