Smoke alarm

Abstract

The utility model provides a smoke alarm. The smoke alarm comprises a bottom shell and an upper cover which is matched and connected with the upper part of the bottom shell, a control circuit board and a smoke sensor are arranged in an inner space defined by the upper cover and the bottom shell, a plurality of connecting ribs are integrally formed and arranged on the top of the upper cover in a surrounding mode, and a top plate is arranged on the upper portions of the connecting ribs. The smoke sensor is arranged on the back surface of the top plate; smog channels for smog circulation are formed between the adjacent connecting ribs; external smoke flows into the smoke sensor part through the smoke channel; the power supply bin is integrally formed in the bottom shell; the buzzer is used for generating alarm sound; the upper cover is provided with a vent hole and a sounding hole; the buzzer is arranged close to the inner side of the sound production hole; the alarm device further comprises a control button arranged on the upper cover, in practical application, the alarm device can be well disassembled and fixedly connected, and the use convenience is higher.

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