Basic introduction to diesel generators

Working principle of diesel generator set:

       The operating principle of a generator set is that a diesel engine drives a generator to generate electricity. In the cylinder of the generator set, the clean air filtered by the air filter is fully mixed with the high-pressure atomized diesel injected by the fuel injection nozzle. Under the squeeze of the piston upward, the volume is reduced, the temperature is increased sensitively, and the ignition point of the diesel is reached. . Diesel fuel is ignited, and the mixed gas is burned violently. The volume is swelled sensibly, and the piston is pushed downward, which is called 'work'. The cylinders of each generator set work in sequence in a certain order. The thrust force acting on the piston passes through the connecting rod and becomes the force to propel the crankshaft to roll, and then drives the generator set crankshaft to rotate. The brushless synchronous communication between the generator and the coaxial equipment of the crankshaft of the diesel engine can use the rotation of the diesel engine to drive the rotor of the generator. Using the principle of "electromagnetic induction", the generator set will output the induced electromotive force and the current will occur through the closed load circuit. . Wanting to use the generator set to obtain a usable and stable power output also requires a series of diesel and generator control, protection equipment and circuits.

Diesel generator set open process:

    Power generation equipment operation is a state-supported fixed asset investment operation. It shoulders the burden of supplying power generation equipment for the national economy and people's daily life. It has been rapidly opened in recent years. In 2008, the production of power generation equipment across the country continued to increase. From January to October, the cumulative output value of power generation equipment reached 1074.5483 million kilowatts, a year-on-year increase of 1.9%. China's industrial policy for electric power operations will turn to optimize the structure of the power supply, that is, priority will be given to renewable energy and new energy such as hydropower, nuclear power, wind power, solar power, and biomass power, while coal power will "save itself to optimize structure and save Resources, attach importance to environmental protection, and trek through technological and economic levels. " In a period in the future, renewable and new energy power generation equipment will usher in an outstanding opportunity to open up, and its proportion in China's total installed power generation capacity will gradually increase.

The future turning direction of diesel generators:

The generator set shoulders the burden of supplying power generation equipment for the national economy and the people's daily life, so it will occupy a very important position for a long time. With the traversing of the society, the original generator set was obviously not suitable for the needs of the society. It is bulky, fuel-consuming, noise, and polluting. Therefore, in the future, the turning direction of the generator set should be energy saving, environmental protection, lightweight, miniaturization, and elegant. In this way, the potential advantages of the generator set can be brought into play.

Analysis of the defects of diesel generators:

After long-term operation of the generator set, various defects will occur. In order to ensure the normal operation of each equipment, the defects of the generator set should be dealt with in a timely manner, and talents are useful to ensure the normal operation of the generator set. How to clean the defects of the generator set?

Blown fuse

原因 Defective causes of generator set:

① The stator and rotor windings are open (one phase is broken) or the power is lost in one phase;

② The winding leads are wrongly connected at the beginning or end or the windings are internally reversed

③ The power circuit contacts are loose and the contact resistance is large;

④ The generator set is overloaded or the rotor is stuck;

⑤ The power supply voltage is too low;

⑥ The equipment of the small generator set is too tight or the grease in the bearing is too hard;

⑦The bearing is stuck.

缺陷 Analysis of defects of generator set:

① identify the breakpoints and correct them;

② Check the winding polarity; determine whether the winding ends are correct;

③ Tighten the loose wiring screws, use a multimeter to determine whether each connector is falsely connected, and correct it; whether the voltage drop is too large due to the power supply wire being too thin, and correct it;

④ Make equipment active from scratch; replace qualified grease;

Overheated bearings

原因 Defective causes of generator set:

① Too much or too little grease;

② The cooperation between the bearing and the journal or end cover is improper (too loose or too tight);

③ The end cover or bearing cover of the generator set is not installed flat;

④ The coupling between the generator set and the load is not calibrated, or the belt is too tight;

缺陷 Analysis of defects of generator set:

① Add smooth fat according to rules (1 / 3-2 / 3 of volume);

② Replace clean and smooth grease;

③ Too loose can be corrected with adhesive, too tight to the car, grinding the journal or the inner hole of the end cover to make it suitable;

④ Proofread from scratch and adjust the belt tension;

⑤ Correct the motor shaft or replace the rotor.

Abnormal sound during operation

原因 Defective causes of generator set:

① The rotor and the stator insulation paper or slot wedge rub against each other;

② Bearings are worn or there are foreign bodies such as sand in the oil;

③ The stator and rotor cores are loose;

④ The stator windings are misconnected or short-circuited.

缺陷 Analysis of defects of generator set:

① Trim insulation and cut groove wedges;

② Replace or clean bearings;

③ Overhaul, rotor core;

④ Eliminate scratches and small rotors in the car if necessary;

⑤ Eliminate defects in the stator winding.