Smoke Exhaust With An Air Curtain Fan

Abstract

A smoke exhaust has a casing, a suction fan and an air curtain fan. The casing has an air chamber, an air duct and a smoke collecting eaves. The air chamber has a lower inlet and an upper inlet. The smoke collecting eaves is mounted on the casing. The suction fan is mounted in the casing. The air curtain fan is mounted on the eaves and is capable generating a downward air curtain. The air curtain prevents the smoke from spreading out of the smoke exhaust.

1 . A smoke exhaust comprising:
 a casing being hollow and having
 an outside wall; 
 an inside wall; 
 an inside wall; 
 a top; 
 a bottom; 
 a partition board mounted in the casing between the outside and inside walls; 
 an air chamber defined in the casing between the partition board and the inside wall and having
 a lower inlet defined through the inside wall near the bottom and communicating with the air chamber; and 
 an upper inlet defined through the inside wall near the top, communicating with the air chamber and being higher than the lower inlet; 
 
 an air duct defined in the casing between the partition board and the outside wall and having
 a mounting hole mounting hole defined through the partition board and communicating with the air duct and the air chamber; and 
 an air outlet defined through the top of the casing and communicating with the air duct; and 
 
 a smoke collecting eaves mounted on and protruding laterally from the top of the casing, corresponding to the inside wall and having a front end and a bottom surface; 
   a suction fan mounted securely through the through hole, being capable of generating airflow from the upper and lower inlets to the air outlet and having a suction portion; and   an air curtain fan mounted on the bottom surface of the smoke collecting eaves, being capable of generating downward air curtain and having
 an air inlet hole defined through the air curtain fan and the smoke collecting eaves; and 
 an air outlet hole defined through the air curtain fan and facing downward. 
   
   
   
       2 . The smoke exhaust as claimed in  claim 1 , wherein the air curtain fan further has two sets of air baffles mounted rotatably in the air outlet hole of the air curtain fan and being capable of splitting the air curtain into two sub air curtains in two directions. 
   
   
       3 . The smoke exhaust as claimed in  claim 2 , wherein one sub air curtain is directed to uprightly downward and the other is directed to the lower inlet of the air chamber. 
   
   
       4 . The smoke exhaust as claimed in  claim 3 , wherein the suction fan further has an oil filter mounted on the suction portion of the suction fan. 
   
   
       5 . The smoke exhaust as claimed in  claim 4 , wherein the air curtain fan further has a screen mounted on the air inlet hole of the air curtain fan. 
   
   
       6 . The smoke exhaust as claimed in  claim 5 , wherein the air chamber further has an oil tank mounted detachably on the bottom of the casing.