Professional manufacturer Haixing Power analyzes the diesel generator fuel supply system for you

The function of the fuel supply system of the diesel generator set is to store and filter diesel, and inject diesel into the combustion chamber in a prescribed working sequence with timing, quantity, constant pressure and corresponding injection quality according to the different working conditions of the diesel engine. , causing it to mix and burn quickly and well with air, and discharge the exhaust gas into the atmosphere.

What route does the fuel take to achieve fuel supply and combustion? Let’s explore the specific process with Haixing Dynamics.

The fuel transfer pump sucks the diesel from the fuel tank, filters out impurities through the filter, and enters the low-pressure oil chamber of the fuel injection pump. The fuel injection pump increases the fuel pressure and injects it into the combustion chamber through the high-pressure fuel pipe to the injector. A very small amount of fuel leaks from the gap between the needle valve coupler in the fuel injector and excess fuel in the low-pressure oil chamber of the fuel injection pump flows back to the fuel tank through the fuel return pipe. Next, let's take a look at the relevant knowledge of the important components of the combustion system.

1. What is the function of the fuel injector? What are the requirements for it?

The function of the fuel injector is to atomize the fuel into fine particles and reasonably distribute the fuel into the combustion chamber according to the shape of the combustion chamber to facilitate even mixing with air and promote ignition and combustion.

The main requirements for the injector include corresponding injection pressure; the sprayed mist oil beam characteristics must have sufficient range, appropriate injection cone angle and good atomization quality; the injector should spray and stop quickly. In time, no dripping will occur.

2. What is the function of the fuel injection pump? What are the requirements for it?

The function of the fuel injection pump is to deliver high-pressure diesel fuel from the fuel pump to the fuel injector in a prescribed working sequence at a regular, quantitative and constant pressure according to the different working conditions of the engine. The fuel injection pump of a multi-cylinder diesel engine should ensure: ① The fuel supply volume of each cylinder is uniform, and the unevenness is not greater than 3% to 5% under rated working conditions. ② Supply oil cylinder by cylinder according to the working sequence of the engine. The oil supply advance angle of each cylinder is the same, and the difference shall not be greater than 0.5° crankshaft angle. ③In order to avoid dripping of the fuel injector, the oil pressure must be established and the oil supply must be stopped quickly.

3. How to adjust the fuel supply advance angle of the fuel injection pump?

There are two ways to adjust the fuel supply advance angle of the fuel injection pump: (1) Adjust the coupling, or change the relative angular position of the fuel injection pump camshaft and the diesel engine crankshaft through the fuel supply advance angle automatic regulator. (2) Change the height of the roller tappet, thereby changing the time when the plunger closes the oil inlet hole on the plunger sleeve, so that the oil supply interval angle of the multi-cylinder engine is equal

4. What is the function of the speed regulator?

The function of the speed governor is to enable the diesel engine to automatically adjust the fuel supply amount as the external load changes, thereby automatically stabilizing the idling speed; limiting the engine speed to prevent overspeeding; under normal engine operating conditions, the two-speed speed governor is directly operated by the driver. The oil supply lever is operated to control the oil supply amount. The full-speed governor can automatically control the oil supply amount and keep the rotation speed stable. When there is a correction device, the engine torque characteristics can be corrected under full load conditions and the adaptability to instantaneous overload can be improved.

5. The composition and function of the speed stabilizing device in the speed regulator.

The speed stabilizing device consists of a push rod, a spring, an adjusting nut, a locking nut and a sheath. Its function is to buffer and stabilize the speed when the oil supply gear rod suddenly returns to the idle oil supply position to prevent the gear rod from inertia. Excessive fuel reduction can cause unstable idling or even engine stalling.

6. What is the function of the fuel injection pump coupling? What types are there?

The function of the fuel injection pump coupling is to transmit the power between the drive shaft and the fuel injection pump camshaft; to compensate for the coaxiality deviation between the two shafts during installation and to use a small amount of relative angular displacement between the two shafts to adjust the fuel supply of the fuel injection pump On time. Commonly used couplings include rigid cross bakelite disc couplings and flexible steel plate couplings.

7. What is the function of the automatic oil supply advance angle regulator?


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