Premix rotational flow flat-flame type combustor for hot-air engine

The invention discloses a pre-mixing swirling flow flat flame burner for heat engines, which comprises a firebox, an combustible gas intake pipe, an air intake pipe, a burner body arranged at top of a firebox, an air pre-heater, a lighter and a water gas discharging pipe. The burner body, shaped as a disc valve block, is evenly provided with combustible gas intake holes vertically and pre-heatingair intake holes along the circumferential direction; the pre-heating air intake holes incline with certain angles with the radial of the burner body; a truncated cone cavum is arranged at internal side at lower half of the burner body, which is communicated with the combustible gas intake holes and the air intake holes; the combustible gas and the pre-heating air sprayed will sufficiently mix with each other in the cavum. The invention is characterized by simple structure, compact size, good mixing of combustible gas and air, short flame, sufficient burning and good discharge, which is fairly suitable for small scale