Fire alarm device for fan

The utility model discloses a fire alarm device for a fan. The fire alarm device comprises a fan main body and an alarm mechanism, the fan main body is connected with an exhaust pipe; the alarm mechanism is installed on the exhaust pipe and comprises an installation box, a power source and an alarm are arranged in the installation box and electrically connected, a fixing plate is arranged on the inner wall of the exhaust pipe, a pair of bimetallic strips are installed on the fixing plate and electrically connected with the power source and the alarm respectively, and a protection mechanism is installed on the fixing plate. The mounting box is mounted on the outer wall of the exhaust pipe and used for mounting a power supply and an alarm; the side wall of the installation box is provided with the sound outlet hole, the sound outlet hole corresponds to the alarm, and when the alarm operates, the alarm can be given through the sound outlet hole, so that a user can find the alarm in time. Through the arrangement