Why does hanging something on the fire sprinkler of a hotel cause an emergency fire?

Children who have stayed in the hotel know that there is a fire sprinkler on the ceiling of the hotel, which will automatically spray water when encountering thick smoke to prevent fire. This system is called automatic sprinkler system, which consists of sprinkler, alarm valve group, water flow alarm device (water flow indicator or pressure switch), pipeline and water supply facilities, and plays a vital role in preventing fire.

So this fire hydrant can hang heavy objects. The answer is obvious, absolutely not. This may trigger the alarm system, causing the alarm of the whole floor. If it is serious, you may have to bear legal responsibility. The structure of this alarm includes a hydraulic alarm bell and a pressure switch. The most obvious feature of its structure is that a heat-sensitive glass ball is blocked at the water outlet of the nozzle. Once there is a fire in the room, the temperature will inevitably rise. At this time, the glass ball will expand and explode when heated, and the fire water in the fire hose above the nozzle will be sprayed out to achieve the fire extinguishing effect.

Of course, the nozzles used in different places are different. For example, the most commonly used nozzles in some civil buildings are those heated to 68℃ for blasting. Think about it, since the liquid expands, it can break the glass ball, which shows that it is very fragile. When it breaks down, the fire fighting system will start, and all alarms such as water flow indicator, pressure switch, flow alarm device, hydraulic alarm bell, fire pump and pressurized water supply device will cause unnecessary trouble.

Fire sprinklers are fragile. Hanging clothes on it and knocking on it may cause it to be damaged, so don't touch the fire sprinkler casually when staying in the hotel. Don't be curious about its internal structure and disassemble it at will. Once the fire control system is started, it is likely to wake up the alarm of the whole building and all customers will be evacuated outside. This trip is very troublesome and may alarm the fire brigade. In the end, I still suffer.