The glass ball of the glass ball nozzle is filled with an organic solution with high thermal expansion coefficient, usually kerosene. At room temperature, the spherical shell can bear a certain supporting force to ensure the sealing performance of the nozzle. When a fire occurs, the temperature of the organic solution rises and expands until the glass body breaks, and the ball seat and seal lose their support and are washed away by the water flow, thus starting to spray water to extinguish the fire.

The red liquid on the spray head is extremely sensitive to heat. When the temperature rises, it expands rapidly, breaking the glass in which it is installed, and then the pressure sensor in the glass will make the fire pump spray water.

Extended data

Fire sprinkler classification:

1, the hanging sprinkler is the most widely used, hanging on the water supply branch pipe, spraying water in the shape of throwing objects, spraying 80 ~ 100% of the total water to the ground. Mainly used in places that do not need decoration, such as workshops, warehouses, parking garages, kitchens and other places. ?

2. The vertical sprinkler is vertically installed on the water supply branch pipe, and the spraying shape is a throwing object, which sprays 80 ~ 100% of the total water downwards, and at the same time, partially sprays it on the ceiling, which is suitable for installation in places where there are many moving objects and are vulnerable to impact, such as warehouses, and can also be hidden on the roof in the interlayer of the ceiling of a room to protect the top boron of the ceiling with more combustible substances.

3. Common sprinklers can be directly installed or hung on the sprinkler pipe network, spraying 40%-60% of the total water downwards and spraying a larger part to the ceiling. Suitable for restaurants, shops, warehouses, underground garages and other places. ?

Fire sprinklers are used in fire sprinkler systems. When a fire breaks out, water overflows through the splash plate of the sprinkler to put out the fire. At present, it is divided into drooping nozzles, vertical nozzles, ordinary nozzles and side wall nozzles.

According to the definition in GB 5135.1.3.1,the sprinkler is automatically started within a predetermined temperature range under the action of heat, or is started by the control device according to the fire signal, and sprays water according to the designed sprinkler shape and flow.

Baidu Encyclopedia-Fire Control spray head