Evaporation fan

The utility model discloses an evaporation fan. Draught fan, including a base, mounting base and shell, a connecting ring is fixedly mounted on the side surface of the end part of the shell; grooves are uniformly formed in the side surface of the connecting ring; a sliding rod is connected into the groove in a sliding manner; a clamping rod is fixedly mounted at one end of the sliding rod; one endof the clamping rod is slidably connected into a positioning groove formed in the side face of the mounting base. The side face of one end of the sliding rod is slidably sleeved with a spring. One end of each spring is fixedly installed on the side face of the end of the corresponding groove, the other end of each spring is fixedly installed on the side face of the end of the corresponding sliding rod, a containing groove is formed in one end of the shell, a fixing ring is slidably connected into the containing groove, a dustproof net is fixedly installed on the inner surface of the fixing ring, and an elastic clampi