Shulou(Shulou.com)11/24 Report--

Now the first thing many people do when they go out to stay in a hotel is to examine the room carefully for fear that cameras will be installed in the room again.

Usually two gadgets can be seen on the ceiling, one of which is a semicircle flashing red light intermittently, while the other is something with a toothed iron sheet. Many people don't know what it is and begin to worry about it. Will this also be some kind of camera, ah, and will take a closer look.

In fact, these are all indoor fire-fighting equipment, and the one with the red light flashing is the smoke alarm. when the smoke alarm detects that the indoor smoke reaches a certain concentration, the intermittent red light will always turn on the red light and sound the alarm, while the other one on the ceiling is the fire sprinkler. (of course, we don't rule out the possibility that pinhole cameras will be installed secretly.)

Fire sprinkler head, also known as fire sprinkler, is an important indoor automatic sprinkler equipment, which is not only a part of the national wet automatic fire extinguishing system, but also belongs to the compulsory fire control standard GB5135.

In the early stage of fire, fire sprinkler can effectively control the rapid spread of fire, thus greatly reducing the loss of life and property. However, fire sprinkler is often a kind of thing that is easy to be ignored.

Nowadays, this kind of fire sprinkler is not only installed in large factories, warehouses, shopping malls and other densely populated places, but also widely used in high-rise civil buildings.

The development history of fire sprinkler head the development of sprinkler technology has a history of nearly 300 years, which is also invented after the fire brought great disaster to human beings.

According to records, in England in 1723, buckets, water and some easily fused parts were assembled into a set of automatic sprinkler devices.

At the beginning of the 19th century, the perforated pipe sprinkler system was born. People punched countless holes in the metal pipe, usually did not give water to the pipe, opened the valve to the pipe in case of fire, and the water was sprayed through the small hole along the pipe to put out the fire.

Although this system has been widely used and promoted for a period of time, it is also found to have obvious shortcomings after use, that is, the small holes in the pipe are easy to be blocked by rust and debris over a long period of time.

In the middle of the 19th century, the automatic sprinkler was finally invented, but the product at that time was still bulky, and the sensitivity was not very high, although it was soon replaced by the improved new product. however, it has made a great contribution to the development of modern fire protection technology.

At the end of the 19th century, a modern sprinkler was manufactured, which uses the lever principle to seal the water with a metal diaphragm and a glass ball, and its structural principle has been used ever since.

The structure and types of fire spray is also relatively simple, which is mainly composed of sprinklers, liquid-filled thermal glass balls and water pipe plugs.

The most important of these is the thermal glass ball, which is composed of glass and internal kerosene / ether solutions, with different colors, which means that the spray will start at different temperatures.

Red means 68 ℃, yellow 79 ℃, green 93 ℃, blue 141 ℃, and red is the most commonly used shower head in our lives.

According to the different use in different places, the fire sprinkler head is mainly divided into drooping type, vertical type, ordinary type, sidewall type and hidden type.

Fire sprinklers work how fire sprinklers are installed on walls or ceilings, connected to pressurized water network pipes, or individual sprinklers are installed along the pipes to protect the area below them.

Because the water is always in the pipe, the fire sprinkler is in a state of "standing by". In the event of a fire, when the temperature in the air is high enough, the air temperature above the fire source will rise, and after the glass ball in the spray head is exposed to high temperature, the internal liquid will begin to expand, and when the expansion temperature exceeds the set temperature, the liquid will break the glass ball.

And this glass ball is like a lever, usually against the pipe plug, when the glass ball breaks, the pipe plug will fall without support, the sprinkler will start, the water will flow out, and it will be spread by the toothed sprinkler under the sprinkler head, so that the area of water spraying will become larger.

The sprinkler continues to spray water over the flame, which in most cases will completely extinguish the fire source, or at least control the heat and limit the production of toxic smoke until the fire brigade arrives.

Automatic fire extinguishing water cannon we can often see fire extinguishing water cannon hanging in high places, such as high-speed railway stations, shopping malls, stadiums and other large space places, which can automatically detect the fire source in the lower place and turn the water cannon muzzle to extinguish it.

This automatic fire extinguishing device is a new generation of high-tech fire-fighting products using a combination of infrared and ultraviolet detection technology. it can be monitored all the time. Once a fire occurs, it will be detected and picked up through the camera on the water cannon. The central processor calculates and obtains the coordinates and starts the water cannon controller.

Turn on the water pump to extinguish the fire, when the detector detects that there is no fire source, the water pump will automatically shut down, stop spraying and extinguish the fire, and will continue to observe the point. If it is reignited, the water cannon will be restarted.

Whether it is fire sprinkler or automatic fire extinguishing water cannon, before the fire brigade arrives at the scene, within a short time in the initial stage of the fire, quickly sprinkling water to control the fire, or even extinguish the fire, is the most effective means of indoor fire fighting at present. this can not only reduce property losses, but also save lives.

The picture in this article is taken from Youtube "History of Fire Sprinklers".

The gif is intercepted from Youtube "How does a sprinkler work"Auto Targeting Monitor".

This article is from the official account of Wechat: manufacturing principle (ID:zhizaoyuanli), author: Lao Zheng

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