In areas such as small and medium-sized towns, industrial and mining terminals, and rural areas, fire engines are difficult to reach or cannot arrive in a timely manner due to traffic restrictions. Portable motor-driven fire pumps, equipped with fire hoses and nozzles, are suitable for fighting general material fires and are not restricted by traffic, power supply, or regional factors. At present, the two main types commonly used are portable motor-driven fire pumps and floating fire pumps. A portable motor-driven fire pump is generally composed of a gasoline engine, a single-stage centrifugal fire pump, a priming device, and accessories such as a portable frame.
Portable motor-driven fire pumps are divided into four-stroke and two-stroke types according to the working cycle of the gasoline engine. A four-stroke gasoline engine completes one working cycle with two revolutions, while a two-stroke gasoline engine completes one working cycle per revolution. Due to its relatively complete valve mechanism, the four-stroke gasoline engine ensures high cylinder volumetric efficiency, good combustion process, and excellent fuel economy. The four-stroke gasoline engine is equipped with a dedicated lubrication mechanism, which provides good lubrication conditions for components and a long service life. Meanwhile, the four-stroke gasoline engine does not require mixed oil (gasoline + lubricant), making it easy to use. Currently, four-stroke gasoline engines have been widely used in portable motor-driven pumps, such as BJ15, BJ10A, etc.
The two-stroke gasoline engine has no valve mechanism or dedicated lubrication mechanism, but it features a simple structure, small size, high power, and light weight. These advantages make the overall portable pump compact, lightweight, and highly maneuverable, so it is also widely used. However, the two-stroke gasoline engine has low cylinder volumetric efficiency, and part of the unburned fresh mixture is discharged during the intake process, resulting in poor fuel economy. In addition, the two-stroke gasoline engine requires burning mixed oil (gasoline mixed with lubricating oil). High-power portable pumps such as BJ25D and BJ22 mostly adopt two-stroke gasoline engines.
Portable motor-driven fire pumps can also be divided into single-cylinder and twin-cylinder types according to the number of engine cylinders. For example, BJ7, BJ331, and BJ10A are all single-cylinder engines, while BJ20, BJ22, BJ25, etc., are twin-cylinder engines.
According to the rated maximum power of the engine, they are classified into 7 horsepower (hp), 9 hp, 11 hp, 15 hp, 20 hp, 22 hp, 25 hp, and other types. At present, the 46 hp high-power fire pump developed by our company fills the domestic gap and is the best alternative to imported products.
