During the working process of a diesel engine, there are many working cycles. These cycles go through four strokes of intake, compression, power, and exhaust. However, generally speaking, the fuel used by the diesel engine in the diesel engine fire pump is diesel oil. The characteristic of diesel oil is that its viscosity is higher than that of gasoline, and it is not easy to evaporate, but its autoignition temperature is lower than that of gasoline, so the formation of combustible mixture and the way of ignition are different. Unlike gasoline engines.
Working principle of diesel engine:
The diesel engine inhales pure air during the intake stroke, and uses the air to change the pressure to generate power. When the compression stroke is near the end, the diesel fire pump will increase the oil pressure to above 10MPa, spray it into the cylinder through the injector, and mix it with the compressed high-temperature air in a short time to form a combustible mixture. During this period, due to the high compression ratio of the diesel engine (generally 16-22), the air pressure in the cylinder can reach 3.5-4.5MPa at the end of the compression, and the temperature can reach 750-1000K at the same time, while the gas mixture pressure of the gasoline engine at this time will be 0.6- 1.2MPa, the temperature reaches 600-700K, which is much higher than the self-ignition temperature of diesel. For this reason, after the diesel fuel is injected into the cylinder, it will ignite and burn by itself immediately after mixing with the air in a very short time. The air pressure in the cylinder rises rapidly to 6-9MPa, and the temperature also rises to 2000-2500K. Pushed by the high-pressure gas, the piston moves downward and drives the crankshaft to rotate to do work, and the exhaust gas is also discharged into the atmosphere through the exhaust pipe. This is the whole process of diesel engine operation.
To understand the diesel engine fire pump, you must understand the working principle of the diesel engine fire pump. More knowledge about diesel engine fire pumps, high-quality diesel engine fire pump models, hot-selling XBC-D diesel engine fire pumps, pls contact us.