Views: 88 Author: Site Editor Publish Time: 2020-07-21 Origin: Site
The speed is a cycle process of the working room of the high speed 6 cylinder diesel engine set. In the continuous cycle work, a unit is needed to describe the index of the number of work. Usually, we use the crankshaft revolutions per minute, which is called the speed.
Under normal operation, the speed of the diesel generator suddenly increases until it exceeds the rated speed and loses control, a huge roar is emitted, and a large amount of black smoke or blue smoke is emitted from the exhaust pipe. The root cause of diesel engine over speed is that the diesel engine loses or changes its speed regulation characteristics. The failure of the fuel injection pump and governor, such as the related parts stuck or loose, will make it oversupply and lose the normal speed control characteristics.
Malfunction of fuel injection pump and governor
The oil volume adjustment screw of the plunger of the fuel injection pump loosens and the plunger loses control. The ball head of the plunger adjustment arm of the fuel injection pump or the rack adjustment arm does not enter the groove of the adjustment fork, so that the plunger is in the rated oil supply position. The moving part of the accelerator pedal lever or the fuel supply adjusting gear lever and the governor is stuck, and the oil quantity adjusting gear lever and the governor lever are disconnected. There is too much lubricating oil in the governor, the viscosity is too big or too dirty, and the weight of the high speed 6 cylinder diesel engine generator cannot be thrown away in time when the speed is increased, causing the lever or gear rod to lose control of the governor.
The above-mentioned reasons increase the speed of the 420KW Power generator diesel engine, and the "speed characteristic" of the plunger type fuel injection pump increases the fuel supply amount as the speed increases, resulting in a vicious cycle of speed and fuel supply mutual promotion, resulting in an over speed accident.
Additional fuel in the combustion chamber
The oil level of the engine oil is too high, causing excessive engine oil to enter the cylinder and enter the combustion chamber for combustion.
The piston ring is seriously worn, and the clearance of the cylinder wall is too large, causing a large amount of oil to enter the combustion chamber and burn. The clearance between the valve and its duct is too large, and the engine oil in the gas distribution chamber is sucked into the combustion chamber for combustion. Excessive oil in the inertial oil-bath air filter is sucked into the combustion chamber for combustion. After cleaning the air filter, there is too much residual gasoline, so that the higher concentration of gasoline vapor enters the combustion chamber and burns. For the 4 stroke electric starting diesel engine with a supercharger, the oil of the supercharger is damaged and the engine oil enters the combustion chamber for combustion. The solenoid valve of the low-temperature starting device leaks oil, causing excess diesel to enter the combustion chamber for combustion. The horizontal diesel engine tilts severely, causing the oil to flow into the intake valve chamber and be sucked into the combustion chamber for combustion. As long as new type diesel engine generator is used correctly, these problems can be avoided.