Diesel high-pressure pump (diesel-powered pump) What is the working principle?

Diesel high-pressure pump, also called diesel-powered pump, is a centrifugal pump driven by diesel fuel in the power pump. This article describes the working principle of diesel-powered pumps, I believe after reading this article, you will have a deeper understanding of the working principle of diesel-powered pumps. Diesel high-pressure pump (diesel-powered pump) What is the working principle? High pressure pump cylinder pressure rapidly rose to 6-9MPa, the temperature also rose to 2000-2500K. And now more and more widely used electronically controlled diesel common rail eruption system can better handle this setback. Its main features are the following three aspects: fuel injection timing and fuel metering thoroughly separated, injection pressure and fuel injection process by the ECU command. Under high pressure gas propulsion, the piston moves downward and the crankshaft rotates to make work. The exhaust gas is discharged into the atmosphere through the exhaust pipe in the same way. Therefore, after the diesel is injected into the cylinder, it mixes with the air in a very short period of time and then ignites by itself. Due to the high compression ratio of diesel engine (usually 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 as high as 750-1000K (the mixture pressure of the gasoline engine at this moment will be 0.6-1.2MPa, Temperature up to 600-700K), greatly exceeding the auto-ignition temperature of diesel. Compared with gasoline engines, diesel engines with low fuel consumption (average 30% lower than the gasoline engine), and the low value of diesel, so fuel economy is better; together with the diesel engine speed is usually lower than the gasoline engine, torque greater than the gasoline engine, but Its quality, homework noise, production and maintenance of high, with emissions than gasoline engine. Where the crankshaft every revolution of a crankshaft, that is, reciprocating piston down the next two trips and completed a homework reincarnation of the engine. Where the crankshaft crankshaft every two revolutions, that is, reciprocating piston up and down the four stroke and completed a homework of the reincarnation of the engine. However, with the opening of modern skills, these defects of diesel engines are gradually being defeated. Nowadays, not all the advanced cars have now started to use diesel engines. The intake of diesel engine in the intake stroke is pure air. The engine can be used for two-stroke engine and four-stroke engine. Homework, the high-pressure pump to high pressure fuel delivery to the public supply pipe, high-pressure pump, pressure sensor and ECU form a closed-loop homework, the public within the oil supply pipe is completed and correct control of oil, completely changed the supply pressure with the engine speed changes The appearance. According to the engine homework to adjust the conditions of each cylinder fuel injection pressure, fuel injection point, duration, and then seek the best fuel injection point. This oil supply method to change with the speed of the engine changes, can not do the best at all speeds of fuel supply. The common rail eruption system is composed of high pressure oil pump, public fuel supply pipe, fuel injector, electronic control unit (ECU) and some pipe pressure sensors. Each injector in the system is connected to the public fuel supply The pipes are connected, and the common supply pipe plays a hydraulic pressure accumulation effect on the injector. Diesel engines are usually driven by crankshaft crankshafts, with the help of high-pressure oil pumps to deliver diesel fuel to each cylinder. Close to the end of the tightening stroke, the diesel fuel pump by the fuel pressure to 10MPa above, injected into the cylinder through the injector, in a very short period of time after the high-temperature air with compressed to form a combustible mixture. However, because the diesel fuel is diesel, its viscosity is larger than that of gasoline and it is not easy to evaporate. However, its autoignition temperature is lower than that of gasoline, so the composition and incineration method of the flammable mixture are different from those of the gasoline engine. Can finish very high injection pressure, and can finish the pre-eruption of diesel. Diesel engine homework process is really the same with the gasoline engine, each homework cycle also experienced air intake, tightening, work, exhaust four trip. Asia Fluid Network () Editor: Huang Nengwen, QQ: