Fire extinguisher is a portable fire extinguishing tool. Chemicals were put in the fire extinguisher to put out the fire. Fire extinguisher is one of the common fire prevention facilities. They are stored in public places or places where fires may occur. Different types of fire extinguishers contain different components and are specially designed for different fires. Care must be taken to avoid counterproductive and dangerous use.
Fire-fighting equipment is a kind of fire-fighting necessity that is often ignored at ordinary times and shows its talents when it is urgently needed. Especially in today's high-rise buildings and indoor decoration, wood, plastic and fabric are widely used. Once a fire breaks out, there is no suitable fire extinguishing equipment, which may lead to great disaster.
In ancient times, fire fighting equipment was very simple, nothing more than hooks, axes, shovels, buckets and the like. The first real special fire extinguisher was invented by British captains Manby and Norfolk in 18 16. This is just one or two barrels filled with 1 water and compressed air.
By the middle of19th century, French doctor galil invented the portable chemical fire extinguisher. Mix sodium bicarbonate and water in a barrel, and put sulfuric acid in a glass bottle at the mouth of the barrel. When in use, the hammer breaks the bottle, so that the chemicals are mixed to produce carbon dioxide, which is discharged out of the barrel by water pressure.
1905, Professor Laurent of Russia invented a foam fire extinguishing agent in St. Petersburg. Aluminum sulfate is mixed with sodium bicarbonate solution, and stabilizer is added. Foam containing carbon dioxide produced after spraying floats on burning oil, paint or gasoline, which can effectively isolate oxygen and suffocate the flame.
1909, Davidson of new york obtained a patent. He used carbon dioxide to squeeze carbon tetrachloride out of a fire extinguisher, and this liquid immediately turned into a heavier nonflammable gas to extinguish the flame. Since then, small fire extinguishers such as dry powder fire extinguishers and liquid carbon dioxide fire extinguishers have appeared.