Local exhaust ventilator with rotating swirler

Abstract

The present invention relates to a local exhaust ventilator which has a rotating swirler to make a swirl flow for increasing exhaust efficiency by expanding an exhaust region. Disclosed is a local exhaust ventilator with a simplified structure, wherein noise due to interference of turbulence is reduced and exhaust gas is removed at a wide area. The local exhaust ventilator includes a disk-shaped swirler rotatably mounted at an exhaust tube, a wing installed at the swirler perpendicular thereto to form a swirl flow, and a driving unit installed at the exhaust tube to rotate the swirler.

1 . A local exhaust ventilator comprising: 
 a disk-shaped swirler rotatably mounted at an exhaust tube;    a wing installed at the swirler perpendicular thereto to form a swirl flow; and    a driving unit installed at the exhaust tube to rotate the swirler.    
   
   
       2 . The local exhaust ventilator of  claim 1 , wherein the wing has a linear structure.  
   
   
       3 . The local exhaust ventilator of  claim 1 , wherein the wing has a curved structure bent toward the central axis of the swirler.  
   
   
       4 . The local exhaust ventilator of  claim 1 , wherein the angle between the rotation axis of the swirler and an inclined side of the swirler is in the range from 60° to 120°.  
   
   
       5 . The local exhaust ventilator of  claim 4 , wherein the wing is spaced apart from the exhaust tube by a predetermined distance, and is elongated outwardly such that the length of the wing is enlarged.  
   
   
       6 . The local exhaust ventilator of  claim 1 , wherein the driving unit has a structure where the swirler is rotatably fitted to the outer circumference of the exhaust tube via a bearing with a circular rack mounted along the top thereof, and a pinion gear is installed at the rotation shaft of a driving motor provided external to the exhaust tube while being coupled to the rack.  
   
   
       7 . A local exhaust ventilator comprising: 
 a swirler comprising an annular plate which is placed near an inlet of an exhaust pipe and which rotates about an axis of the exhaust pipe, and a plurality of blades which are placed along an outer rim of the annular plate, each blade being fixed in the radial direction on the annular plate while protruding toward the exhaust pipe;    a driving unit installed within the exhaust pipe and having a shaft of the swirler attached thereto for rotating the swirler.    
   
   
       8 . The local exhaust ventilator of  claim 7 , further comprising a swirler cover comprising a ring-shaped top cover which covers a top of the blades and provides a first gap between an outer surface of the exhaust pipe and an inner rim of the top cover, and a ring-shaped bottom cover which covers a bottom of the blades and is positioned apart from the top cover by a second gap.  
   
   
       9 . The local exhaust ventilator of  claim 8 , wherein the swirler cover forms a gap space between the top cover and the bottom cover such that the gap space decreases in height as the distance from the rotational axis of the swirler increases in a radial direction.  
   
   
       10 . The local exhaust ventilator of  claim 8 , wherein the top cover has a hole with a diameter larger than the outer diameter of the exhaust pipe, and the bottom cover has a hole with a diameter close to the inner diameter of the exhaust pipe.  
   
   
       11 . The local exhaust ventilator of  claim 8 , wherein each blade is in a streamlined shape of which the height decreases as a distance from the rotational axis of the swirler is increased in a radial direction.  
   
   
       12 . The local exhaust ventilator of  claim 11 , wherein the top cover of the swirler cover is formed in a shape contoured to the shape of the blade of the swirler.  
   
   
       13 . The local exhaust ventilator of  claim 8 , wherein the outer portion of the blade extends in a radial direction beyond the outer rim of the annular plate.  
   
   
       14 . The local exhaust ventilator of  claim 8 , wherein each blade of the swirler is straight in a radial direction.  
   
   
       15 . The local exhaust ventilator of  claim 8 , wherein each blade of the swirler is curved toward the perimeter of the annular plate.  
   
   
       16 . The local exhaust ventilator of  claim 8 , wherein each blade of the swirler is fixed perpendicular to the surface of the annular plate.  
   
   
       17 . The local exhaust ventilator of  claim 8 , wherein the driving unit comprises a driving motor which is mounted inside the exhaust pipe by brackets, and a driving rod of the driving motor which is fixed at the center of rotation of the swirler and which rotates the swirler.