Burner

Abstract

A burner includes a partition wall that partitions a mixing chamber, which generates an air-fuel mixture, and a combustion chamber, which burns the air-fuel mixture. The partition wall includes a plurality of communication passages that communicate the mixing chamber with the combustion chamber. Further, a heating unit that heats the partition wall is attached to the partition wall. Such a structure heats the partition wall and a mesh with the heating unit and burns particulate matter deposited on the partition wall and the mesh.

What is claimed is: 
     
         1 . A burner comprising:
 a mixing chamber that generates an air-fuel mixture;   a combustion chamber that burns the air-fuel mixture;   a partition wall that partitions the combustion chamber from the mixing chamber;   a plurality of communication passages formed by the partition wall to communicate the mixing chamber with the combustion chamber;   a heating unit that heats the partition wall; and   an ignition portion that ignites the air-fuel mixture in the combustion chamber, wherein   the partition wall includes, as viewed from the front, a first portion, which is located closer to the ignition portion than an outer rim of the partition wall, and a second portion, which is located closer to the outer rim of the partition wall than the ignition portion;   the first portion includes at least one of the communication passages; and   the heating unit is configured to increase the first portion to a higher temperature than the second portion.   
     
     
         2 . (canceled) 
     
     
         3 . (canceled) 
     
     
         4 . The burner according to  claim 1 ,
 each of the first portion and the second portion includes at least one of the communication passages; and   the heating unit includes a heating element that contacts the first portion and the second portion.   
     
     
         5 . The burner according to  claim 1 , wherein the heating unit is attached in the mixing chamber. 
     
     
         6 . The burner according to  claim 1 , further comprising a controller that controls burning of the air-fuel mixture and driving of the heating unit,
 wherein the controller is configured to start burning the air-fuel mixture when the heating unit heats and increases the temperature of the partition wall.   
     
     
         7 . The burner according to  claim 6 , wherein the controller is configured to also perform heating with heating unit while the air-fuel mixture is being burned in the combustion chamber. 
     
     
         8 . The burner according to  claim 1 , comprising:
 a combustion tube including a distal end defining an injection port that injects combustion gas, which is the burned air-fuel mixture;   a first inner tube extending through the combustion tube toward the injection port, wherein the air-fuel mixture flows into the first inner tube from a side opposite to the injection port;   a second inner tube arranged in the combustion tube and fitted into the first inner tube, wherein the second inner tube includes a closed opening located toward the injection port;   a connection wall connected to an inner surface of the combustion tube and an outer surface of the first inner tube, wherein the connection wall closes a gap between the combustion tube and the first inner tube;   the partition wall that is annular and connected to the inner surface of the combustion tube and an outer surface of the second inner tube; and   an ignition portion located closer to the injection port than the partition wall to ignite the air-fuel mixture.