The utility model discloses a washing and
drying all-in-one
machine, relates to the technical field of
textile equipment, aims to solve the problems that hot air generated by a hot
air drying box of the all-in-one
machine is wasted and pollutes the environment, and adopts the technical scheme that a hot
air recovery device comprises a hot air pipeline I, a fan, a hot air pipeline II, a plurality of heaters and a hot air pipeline III, the heater comprises a heat conduction roller, bearings and a preheating roller, the heat conduction roller is hollow, the two ends of the heat conduction roller communicate with the second hot air pipeline and the third hot air pipeline correspondingly, the multiple bearings are fixedly connected to the outer wall of the heat conduction roller, the preheating roller is rotationally connected to the outer rings of the multiple bearings, and a plurality of vent grooves are formed in the
peripheral wall of the heat conduction roller. The hot air is discharged into the preheating
pipe, so that the preheating
pipe is heated, cloth is preheated in advance, the
drying time of the cloth in the hot
air drying box is shortened, high-temperature
waste gas is discharged through the
waste gas purification device connected with the third hot air pipeline, the high-temperature
waste gas is recycled and purified,
energy consumption is reduced, and environmental
pollution is relieved.