1. Characteristics of abnormal noise from connecting rod bearing:
When the engine accelerates suddenly, there is a continuous and obvious knocking noise of "block, block, block". The bearing and connecting rod journal are too tight and the radial adjustment clearance is too large. The alloy layer of the connecting rod bearing is burned or peeled off. The connecting rod bearing cap mounting bolts are loose or broken. Oil pressure is too low or oil is too thin. The engine operates for a long time at high temperature and heavy load.
2. Diagnosis and troubleshooting methods for abnormal noise in generator bearings:
First check whether the fan V-belt is shaking. If it operates normally, pay attention to the sound it makes. by the generator. If the sound is high and harsh, it means the brush is beating on the slip ring (you will see blue at night) if the sound is high and sharp, itela means the bearing is loose or the bushing is damaged; is heavy, this means that the rotor and stator collide.
The abnormal generator bearing noise is a soft, continuous “rusting” sound. As the engine speed increases, the tone of the abnormal noise becomes higher pitched. The reason for the abnormal noise of the generator bearings is that the generator has not been maintained in time and grease has been added to the bearings, causing the bearings to wear out due to lack of lubrication.
Abnormal noise from bearings of Shanyu generators is usually slight and is often mixed with engine operating noise, making diagnosis difficult. To determine whether the abnormal noise is caused by the generator bearing, you can remove the generator belt after stopping the engine, adjust its tension to completely loosen it, and then run the engine. If the abnormal noise disappearsat that moment, he. means the original abnormal noise was caused by the generator bearing race.
When the generator bearings make abnormal noise, the generator should be disassembled and disassembled, and the damaged bearings should be replaced. The bearing noise is relatively fragile, which can be determined by removing the belt. Remove the bearings and check the degree of wear, and add appropriate amount of grease if the rotor and stator collide, repair or replace the parts according to the surface marks, correct the curvature of the generator shaft, replace the carbon brushes with new ones, and assemble the belt pulley correctly to avoid collision with the generator heat sink.
The generator makes abnormal noises when operating, which is usually a mechanical failure. The reasons are: the fan belt is too loose ou too tense; the generator bearing is damaged, stuck or poorly lubricated; the rotor and stator collide (commonly called “sweep”); the ring is incorrect, causing the carbon brush to tip into the frame. The swing makes noise; the generator is not in place when reinstalled, the body tilts, causing the generator armature shaft to bend and the pulley to rub against the heat of the generator. to flow.
Detailed informationGenerator operating procedures:
1. Before starting, check whether there is sufficient oil in the fuel tank and whether there are oil leaks in each oil pipe and joint. Whether the water in the cooling system is sufficient, clean and leak-free, and whether the fan belt is properly tightened. Check that the transmission parts of the internal combustion engine and generator should be reliably connected, that the fils of the output line must be well insulated and all instruments must be complete and efficient.
2. After starting, it should run at low speed for 3-5 minutes. The operation can only be started after the oil temperature and pressure are normal. There should be no abnormal noise when the generator accelerates, the slip ring and commutator brushes should be in good contact, and there should be no jumps or sparks. After the operation is stable and the frequency and voltage reach the rated values, power can be supplied externally.
3. Abnormal noises, odors and sudden changes in water temperature occur during operation. When the oil pressure increases or decreases sharply, the machine should be stopped immediately to check and troubleshoot.
4. The power factor of the generator must not exceed the phaselate (lag) 0.95. The variation range of the frequency value should not exceed 0.5 Hz.
5. Before stopping, you must first turn off the main switches of each power branch, gradually reduce the load, then turn off the main power switch of the generator and return the excitation rheostat to the maximum resistance position to reduce the voltage to the minimum value, then turn off the excitation switch and the neutral point grounding switch, and finally stop the operation of the internal combustion engine. ?
Data source: Baidu Encyclopedia: Generator Operation Procedures