Burner for exhaust purifying device

A burner for an exhaust purifying device comprising:

• a tube, which includes:
• a premixing chamber for mixing air for combustion and fuel to generate a pre-mixed air-fuel mixture;
• a combustion chamber for combusting the pre-mixed air-fuel mixture to generate post-combustion gas;
• and
• a discharge port for discharging the post-combustion gas;
• an air supply port for supplying the air for combustion into the tube;
• a fuel supply port for supplying fuel into the tube;
• and
• an ignition portion for igniting the pre-mixed air-fuel mixture in the combustion chamber,
• wherein the premixing chamber includes a first mixing chamber and a second mixing chamber, the second mixing chamber connected to the first mixing chamber and the combustion chamber,
• the tube further includes:
• a swirling flow generation unit, which is arranged upstream of the first mixing chamber and is configured to generate a swirling flow of which a center direction corresponds to a fuel injection direction;
• and
• a diffusion unit, which is arranged between the first mixing chamber and the second mixing chamber and is configured to diffuse the fuel incorporated in the swirling flow;
• and
• the diffusion unit includes a connecting hole having a diameter less than the inner diameter of the tube.