Burner for exhaust purifying device

Abstract

A burner used in an exhaust purifying device that purifies exhaust in an exhaust pipe of a diesel engine is provided with a tubular flame stabilizer including an ejection port from which fluid generated through combustion is ejected. The flame stabilizer includes a connecting passage, which connects the interior of the flame stabilizer and the exterior of the flame stabilizer. A recirculation unit is arranged at an outer side of the flame stabilizer. The recirculation unit includes a flow receiving portion that receives the fluid ejected from the ejection port, and an outer guiding portion that guides the fluid received by the flow receiving portion to the connecting passage.

1 . A burner used in an exhaust purifying device that purifies exhaust in an exhaust pipe of an engine, the burner comprising:
 a tubular flame stabilizer including an ejection port in a distal end to eject fluid generated through combustion;   a connecting passage that connects an interior of the flame stabilizer and an exterior of the flame stabilizer; and   a recirculation unit arranged at an outer side of the flame stabilizer, wherein the recirculation unit includes,   a flow receiving portion that receives the fluid ejected from the ejection port, and   a guiding portion that guides the fluid received by the flow receiving portion from the flow receiving portion to the connecting passage.   
     
     
         2 . The burner according to  claim 1 , wherein the flow receiving portion is formed to be annular to face an edge of the ejection port in an axial direction of the flame stabilizer. 
     
     
         3 . The burner according to  claim 2 , wherein the guiding portion is formed to surround the flame stabilizer. 
     
     
         4 . The burner according to  claim 2 , wherein the guiding portion includes
 a tubular outer guiding portion that surrounds the flame stabilizer, and   a tubular inner guiding portion that extends from an inner edge of the flow receiving portion toward the ejection port.   
     
     
         5 . The burner according to  claim 1 , wherein the connecting passage is arranged closer to a basal end of the flame stabilizer with respect to a middle of the flame stabilizer in the axial direction. 
     
     
         6 . The burner according to  claim 1 , wherein
 the flame stabilizer includes an inner tube and an outer tube that surrounds the inner tube,   the flame stabilizer is connected to an air supply pipe that supplies air to a gap between the inner tube and the outer tube, and   the inner tube includes an air supplying hole that connects the gap between the inner tube and the outer tube with the interior of the inner tube.   
     
     
         7 . The burner according to  claim 1 , wherein the distal end of the flame stabilizer has an enlarged diameter. 
     
     
         8 . The burner according to  claim 1 , further comprising an ignition unit in the flame stabilizer. 
     
     
         9 . The burner according to  claim 1 , wherein the interior of the flame stabilizer is partitioned into a premixing chamber, which generates a mixture of fuel and air, and a combustion region, which burns the mixture supplied from the premixing chamber.