Self-cleaning burn-proof device of heat exchanger

The utility model relates to a self-cleaning device of a high-efficiency heat exchanger. A centre shaft is arranged in a heat exchange tube of a gas-liquid heat exchanger and is pivoted with a plurality of fan blades, and each fan blade is composed of blades on a pivoting seat and blades molded on the pivoting seat. The angle of the blades is designed according to exhaust gas flow velocity to control the rotate speed of the fan blade. The blades are fixedly connected with cleaning wiping rod which are touched with the inner wall of the heat exchange tube. When high-temperature exhaust gas flows pass through the heat exchange tube, the pressure of high-temperature exhaust gas blow the fan blades to rotate, and the fan blades drive the cleaning wiping rod to rotate to constantly clean away greasy dirt on the inner wall of the heat exchange tube, so that the greasy dirt is not adhered to the inner wall of the heat exchange tube. High heat exchange efficiency is ensured, and scaling and clogging and fire accident