Working principle of the fire hose reel

The working principle of the fire hose reel mainly involves the following key links:

1. Water source connection and pressure transmission

Fire hose reels are usually connected to the fire water supply system of the building, such as the water supply network of the indoor fire hydrant system or the automatic sprinkler system. When a fire occurs, the pressure in the fire water supply system will push water to the fire hose reel. The source of this pressure can be a fire water pump, a high-level water tank or a municipal water supply network. Through the connection of the pipe, the water pressure is transmitted to the reel.

2. Reel structure and hose storage

The reel generally consists of a rotatable shaft and a housing. The hose is neatly wound around the shaft and is usually stored to save space and keep things tidy. The housing not only protects the hose, but also limits the hose from loosening and preventing it from getting tangled or damaged when not in use. When the fire hose reel is needed, people can pull the hose, and the shaft will rotate, allowing the hose to be pulled smoothly from the reel.

3. Valve controls water flow

There is a valve on the fire hose reel, which is usually a ball valve or a gate valve. The function of the valve is to control the flow of water. When the valve is closed, water cannot flow from the reel to the hose. When a fire occurs and needs to be extinguished, the operator opens the valve by rotating the handle or wrench, allowing water to flow from the water supply network into the hose.

4. The role of hose and spray gun

The hose is usually made of rubber or plastic and has a certain degree of flexibility and pressure resistance. After passing through the valve, the water flows along the hose to the spray gun. The spray gun is a key component for controlling the water flow, which can adjust the size and shape of the water flow. The spray gun is generally equipped with a trigger or valve. The operator can control whether the water flow is sprayed out, as well as the intensity and angle of the spray by operating the trigger or valve.

5. Fire extinguishing principle

When water is sprayed from the spray gun, a stream of water with a certain pressure and speed is formed. This stream of water rushes to the fire source and plays a role in extinguishing the fire. Its main principles include: first, cooling the burning material. Water has a large specific heat capacity and can absorb a large amount of heat, lowering the temperature of the burning material to below the ignition point, thereby preventing the combustion from continuing; second, isolating the air. The water flow covers the surface of the burning material, preventing oxygen from contacting the burning material and interrupting the combustion reaction; third, diluting the combustible gas and smoke produced by the combustion, reducing the danger of fire.

To summarize, the fire hose reel is connected to the fire water supply system, uses the reel structure to store the hose, controls the water flow through the valve, and sprays water with the help of the hose and spray gun to extinguish the fire.

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