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How to judge the speeding failure of Volvo diesel generator set?
May 30, 2022
The most common occurrence of speeding failures is the diesel generator set using the mechanical speed control device, which refers to the phenomenon that the speed of the diesel engine is out of control, and the speed greatly exceeds the specified maximum operating speed. Once the diesel generator set has a flying fault, it will bring great harm to the diesel generator set, and even directly threaten the personal safety of the unit operator. Therefore, the user must pay attention to avoid the flying fault of the generator set as much as possible.
Recently, I received a fault repair report: the diesel generator set automatically turned off after being loaded. Our company arranged for after-sales technicians to rush to the scene to check and find that the high-pressure oil pump rack of the unit was issued, and the rack moved until there was a little gap, and checked the governor, and started the car. howling. Immediately stopped the car and found that the car could not be stopped. Due to improper handling, the diesel engine was running at overspeed, resulting in a speeding incident.
The most common occurrence of speeding failures is the diesel generator set using the mechanical speed control device, which refers to the phenomenon that the speed of the diesel engine is out of control, and the speed greatly exceeds the specified maximum operating speed. Once the diesel generator set has a speeding failure, due to severe overspeed, the bolts will be broken, and the cylinder head, body, piston and other parts will be damaged. Major accidents such as breakage and scrapping of the whole machine will bring great harm to the diesel generator set, and even directly threaten the personal safety of the generator set operator. Therefore, users must pay attention to avoid the speeding failure of the generator set as much as possible.
How to judge the fault of diesel generator set flying car?
The speeding fault of the diesel generator set can be judged mainly according to the operation condition of the diesel engine and the change of the sound. Since the speed of the generator set increases rapidly, the working sound of the generator set will suddenly increase during operation, and a harsh whistling sound will be issued. Once you hear this kind of sound, you must take decisive and effective measures to stop the machine immediately to avoid major losses.
Reasons for the failure of diesel generator set flying
1. The speed is too high during operation and exceeds the rated speed for a long time. For example, the rated speed is usually 1500 rpm, but in use, due to other reasons, the voltage of the unit cannot be raised at this speed. At this time, in order to ensure the operating voltage, the speed is artificially increased.
2. The oil level control plug at the lower part of the governor shell is loose or falls off, resulting in the lack of lubricating oil inside the governor, causing wear.
3. The adjustment spring is broken.
4. The connecting pin of the rack and the tie rod falls off, and the spring locking piece is broken.
5. The lever pin falls off.
6. The fuel injection pump rack is stuck.
7. The ball bearing of the governor is damaged.
8. The lubricating oil surface in the fuel injection pump is too high, and the viscosity of the oil is too large.
Among them, 3-8 can directly cause serious consequences of out-of-control oil supply.
Emergency measures for diesel generator set crashing
The emergency treatment of the diesel generator set speeding failure is to try to stop it quickly. The method is as follows:
1. Quickly cut off the oil circuit: quickly pull the accelerator to the parking position, turn off the oil circuit switch, and quickly disconnect the fuel injection pump inlet pipeline if necessary.
2. The actuator that quickly cuts off the circuit.
3. Quickly cut off the air passage: If there is a diesel engine with explosion-proof device, the intake passage can be quickly closed. Most of the diesel generator sets we use now do not have such a diesel engine. For such diesel engines, the air filter can be wrapped with clothes, or the air intake holes can be directly blocked with items prepared in advance.
4. When the situation is out of control, personnel should quickly evacuate the scene, disconnect the oil circuit from the outside, and do a good job of peripheral security.
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