China Naming Network - Almanac query - What are fire signs, smoke signs and broadcast signs?

What are fire signs, smoke signs and broadcast signs?

As shown in the figure: 13 smoke sense, 15 fire broadcast (sound box).

Extended data:

1, smoke detector is actually another name for smoke detector or smoke detector. This smoke detector is the first domestic detector to obtain the latest 3C certification, and it is recommended to fire brigades all over the country.

2. Working principle:

(1) The infrared beam of the infrared emission tube is scattered by smoke particles, and the intensity of the scattered light is directly proportional to the smoke concentration, so the intensity of the infrared beam received by the photosensitive tube will change and be converted into a point signal, and finally into an alarm signal.

(2) When there is smoke, the smoke particles enter the maze to scatter the infrared light emitted by the emission tube. There is a linear relationship between the intensity of scattered infrared light and smoke concentration, and the subsequent sampling circuit changes. The main control chip built in the alarm can confirm whether there is a fire by judging these changes.

(3) The smoke sensing of the alarm is mainly completed by the optical maze, and there is a set of infrared emitting and receiving photocells in the maze, and the incident angle is 135 degrees. When there is no smoke in the environment, the receiving tube can't receive the infrared light emitted by the infrared emitting tube, and the subsequent sampling circuit has no electric signal change.

3. Fire broadcast system, also known as emergency broadcast system, is an important equipment for fire escape, evacuation and fire fighting command, and plays an extremely important role in the whole fire control and management system. In case of fire, the sound source equipment sends out an emergency broadcast signal, and after power amplification, the broadcast switching module switches to the speakers in the designated broadcast area to realize emergency broadcast.

Baidu encyclopedia-smoke alarm

Baidu Encyclopedia-Fire Broadcasting System