Conical air supply combustion device with large regulating ratio

The invention discloses a conical air supply combustion device with a large regulating ratio. The conical air supply combustion device with the large regulating ratio comprises an air regulating baffle, an air bellows, a conical diffusion disc, a flame tube, an ignition electrode, a gas nozzle and a flame detecting bar. The air regulating baffle is hinged to an air inlet of the air bellows, the gas nozzle is installed at the front end inside the air bellows, and the conical diffusion disc is installed at the rear end inside the air bellows and connected with the gas nozzle. The flame detecting bar penetrates through the whole gas nozzle, one end of the flame tube is inserted into the air bellows and overlaps part of the conical diffusion disc, and the ignition electrode is installed at the lower end of the air bellows. According to the device, the air regulating baffle, the gas nozzle and the conical diffusion disc are matched, an air duct distributed in a trapezoid shape is arranged in the conical diffusion