There are many types of fire extinguishers. According to their moving methods, they can be divided into: portable and cart type; according to the power source of driving the fire extinguishing agent, they can be divided into: Gas Cylinder type, pressure storage type, chemical reaction type; according to the fire extinguishing filled The agent can be divided into: foam, dry powder, halogenated alkane, carbon dioxide, water and so on.

Dry powder Fire Extinguisher

Principle: The dry powder fire extinguisher is filled with dry powder fire extinguishing agent. Dry powder fire extinguishing agent is a dry and easy-to-flow fine powder used for fire extinguishing. It is composed of inorganic salt with fire extinguishing effect and a small amount of additives through drying, crushing and mixing to form a fine solid powder. Use compressed carbon dioxide to blow out dry powder (mainly containing sodium bicarbonate) to extinguish the fire.

Structure: The dry powder fire extinguisher uses carbon dioxide gas or nitrogen gas as power to spray the dry powder in the bottle to extinguish the fire. Dry powder is a kind of dry, easy-to-flow fine solid powder, which is composed of a base material capable of extinguishing fire and additives such as moisture-proof agent, flow promoter, and anti-caking agent.

Foam Fire Extinguisher

Principle: There are two containers in the foam fire extinguisher, which respectively hold two liquids. They are aluminum sulfate and sodium bicarbonate solutions. The two solutions do not touch each other and do not cause any chemical reaction. (Never touch the foam fire extinguisher at ordinary times) When a foam fire extinguisher is needed, turn the fire extinguisher upside down. If the two solutions are mixed together, a large amount of carbon dioxide gas will be produced:

In addition to the two reactants, some foaming agents are added to the fire extinguisher. When the switch is turned on, the foam is sprayed from the fire extinguisher, covering the burning material, isolating the burning material from the air, and reducing the temperature to achieve the purpose of extinguishing the fire.

Structure: The acid-base fire extinguisher is composed of a cylinder, a cap, a sulfuric acid bottle, and a nozzle. The cylinder is filled with sodium bicarbonate aqueous solution, and the sulfuric acid bottle is filled with concentrated sulfuric acid. There is a lead stopper at the mouth of the bottle, which is used to seal the mouth of the bottle to prevent the concentrated sulfuric acid in the bottle from being diluted by water or mixing with the liquid medicine outside the bottle. The working principle of the acid-base fire extinguisher is to use the two kinds of agents to mix and produce a chemical reaction to generate pressure to spray out the agent, thereby extinguishing the fire.

Carbon dioxide fire extinguisher

Principle: Liquid carbon dioxide is stored in the fire extinguisher bottle. When it is working, when the pressure of the bottle valve is pressed down. The internal carbon dioxide fire extinguishing agent is sprayed from the siphon tube through the bottle valve to the nozzle, so that the concentration of oxygen in the combustion zone drops rapidly. When the carbon dioxide reaches a sufficient concentration, the flame will suffocate and extinguish. At the same time, the liquid carbon dioxide will quickly vaporize. It absorbs a lot of heat within a period of time, so it has a certain cooling effect on the burning material and also helps to extinguish the fire. The cart-type carbon dioxide fire extinguisher is mainly composed of several parts such as the bottle body, the head assembly, the nozzle assembly, and the frame assembly. The built-in fire extinguishing agent is liquid carbon dioxide fire extinguishing agent.

Structure: The barrel of the carbon dioxide fire extinguisher is made of high-quality alloy steel through a special process, and its weight is reduced by 40% compared to carbon steel. It has the characteristics of convenient operation, safe and reliable, easy to store, light and beautiful.

Applicable occasions: It is suitable for putting out the first fire of flammable liquid and gas, and also for putting out the fire of live equipment. It is often used in laboratories, computer rooms, substations, and places with high maintenance requirements for precision electronic instruments, valuable equipment or items.

Water Fire Extinguisher

The fire extinguishing agent in the clear water fire extinguisher is clear water. Water has lower viscosity, higher thermal stability, higher density and higher surface tension at room temperature. It is an ancient and widely used natural fire extinguishing agent, easy to obtain and store.
It mainly relies on cooling and suffocation to extinguish fires. Because each kilogram of water is heated from room temperature to the boiling point and completely vaporized, it can absorb 2593.4KJ of heat. Therefore, it uses its own ability to absorb sensible and latent heat to play a cooling and extinguishing effect, which is unmatched by other fire extinguishing agents. In addition, the water vapor formed after the water is vaporized is an inert gas, and the volume will expand by about 1700 times.

When extinguishing a fire, the water vapor generated by water vaporization will occupy the space of the combustion zone, dilute the oxygen content around the combustion material, prevent fresh air from entering the combustion zone, and greatly reduce the oxygen concentration in the combustion zone, so as to achieve the purpose of suffocating and extinguishing. When the water is in the form of spray mist, the specific surface area of the formed water droplets and mist droplets will greatly increase, enhancing the heat exchange between water and fire, thereby enhancing its cooling and asphyxiating effects.

In addition, it can also dilute some combustible and flammable liquids that are soluble in water; the water mist produced by strong jets can emulsify the combustible and flammable liquids, so that the surface of the liquid can be rapidly cooled, and the rate of flammable vapor generation can be reduced. To achieve the purpose of extinguishing fire.

Simple fire extinguisher

Simple fire extinguisher is a portable fire extinguisher developed in recent years. Its characteristic is that the fire extinguishing agent is filled below 500 grams, the pressure is below 0.8 MPa, and it is a small fire extinguisher that can be used for one-time use and cannot be refilled.

According to the type of fire extinguishing agent, there are 1211 fire extinguishers, also called aerosol halogenated fire extinguishers; simple dry powder fire extinguishers, also called portable dry powder fire extinguishers; and simple air foam fire extinguishers, also called portable air foam Fire extinguisher. Simple fire extinguishers are suitable for home use. Simple 1211 fire extinguishers and simple dry powder fire extinguishers can put out first-time fires in LPG stoves and upper angle valves of steel cylinders, or gas stoves, and can also put out solids such as hot pot fires and waste paper baskets. A fire that burns combustible materials. Simple air foam is suitable for initial fires caused by oil pans, kerosene stoves, oil lamps and candles, and can also extinguish solid combustible fires.

Simple fire extinguishers are more suitable for standing homes, which is convenient for extinguishing sudden fire situations.