Working principle of the diesel engine fire pump
To better understand the diesel engine fire pump, we must first to know the working principle of the diesel fire pump.
During the working process of a diesel engine, there are many working cycles, and these cycles, through the four strokes of the air intake, compression, work, and exhaust. However, in general, the fuel used in diesel engine fire pumps is diesel. The characteristics of diesel oil are that the viscosity is larger than that of gasoline, and it is not easy to evaporate. The self-ignition temperature is lower than that of gasoline, so the formation and ignition method of the combustible mixture is different from gasoline engines.
Detailed analysis of the working principle of diesel engine operation:
The diesel engine draws in the pure air during the intake stroke, and the use of air to change the pressure induce power. At the end of the compression stroke, the diesel fire pump will increase the oil pressure to more than 10 MPa, spray it into the cylinder through the injector, and mix with the compressed high-temperature air in a short time to form a combustible mixture. During the period, because the compression ratio of the diesel engine is high (generally 16-22), the air pressure in the cylinder can reach 3.5-4.5MPa at the end of compression, and the temperature is as high as 750-1000K, and the gas pressure of the gasoline engine at this time will be 0.6- 1.2MPa, the temperature reaches 600-700K, which greatly exceeds the auto-ignition temperature of diesel. For this reason, after being injected into the cylinder, the diesel fuel is automatically ignited and burned after being mixed with the air in a short time. The air pressure in the cylinder rises rapidly to 6-9 MPa and the temperature rises to 2000-2500K. Under the push of high-pressure gas, the piston moves downward and drives the crankshaft to rotate, and the exhaust gas is also discharged into the atmosphere through the exhaust pipe. This is a complete process of diesel engine operation.
As an improved large-flow water supply equipment in fire pump products, diesel fire pumps are now more and more popular in the market. In the past two years, it has been transferred from the original docks, stations, airports and other large transportation sites with high traffic flow to the enterprise buildings. With the development of the economy, today’s enterprises are gradually becoming larger, and the production workshops are getting bigger and bigger. The more the production workers are, the more comprehensive the safety of all aspects, the diesel engine fire pump has gradually become replaced by the ordinary fire pump. As a new era, especially entrepreneurs, we should understand the working principle of diesel fire pumps.