Fire detector for electrical fire protection

The fire detector comprises a main body with the section being in a concave shape with an opening facing downwards, a mounting cavity and a working cavity are formed in the main body, a plurality of air holes are formed in the side wall of the main body and communicate with the working cavity and the outside, and a gear motor is fixedly connected to the inner top wall of the mounting cavity. An output shaft of the gear motor is fixedly connected with a main shaft, the main shaft is rotatably connected with the main body through a bearing in a penetrating mode and extends into a groove of the main body, the end, located in the groove of the main body, of the main shaft is in interference fit with a first gear, and the inner side wall of the groove of the main body is fixedly connected with a fixed gear ring; and two second gears are jointly engaged between the first gear and the fixed gear ring. The detector has the advantages that the detector is wider in detection range, the construction amount and cost are