(1) the main cause of compressor surge:
Diesel engine emergency flameout or sudden unloading (emergency throttle).
Surge caused by atmospheric temperature variation. In the summer of the turbocharger with the test, in winter may occur surge, this is because the temperature changes caused by the change of the operating point.
Contamination of compressor, especially the contamination of vaned diffuser.
An engine unit two supercharger, a common air intake manifold, when a cylinder does not work, you can cause the compressor surge.
(2) reducing intake pressure of diesel engine
Main cause：
Compressor filter contamination.
Impeller and vaned diffuser contamination.
Baotou North Ben heavy truck turbocharger turbocharger parts have more carbon deposits, so that the increase in resistance to rotation.
The intercooler is polluted and the air inlet resistance is increased.
Turbine exhaust is not smooth. This is due to the exhaust pipe blockage, deformation caused by the rotor speed is not high.
The Baotou beiben heavy truck parts turbocharger outlet pressure suddenly drops, generally due to bearing damage caused by.
(3) diesel engine intake pressure is too high, in general, the intake pressure is not too high supercharger itself, but caused by the engine.
The main reasons are:
Baotou North heavy truck parts exhaust valve leakage.
Due to the improper timing of the engine fuel injection or other reasons caused by the additional combustion period is too long, so that the thermal energy of the turbine, the speed increases, the intake pressure increases.
(4) abnormal vibration of supercharger
Main cause：
Turbine blades are damaged, resulting in imbalance.
Turbine rotor carbon deposition, causing the rotor imbalance.
Bearing damage.
(5) the occurrence of continuous abnormal sound is caused by the collision between the rotor and the shell. Due to the small gap between the rotor and the casing assembly, if the installation is not properly adjusted or serious damage to the bearing, you can rub.
(6) the main reason why the oil return temperature is too high (more than 105 DEG C):
At the end of the turbine, the oil and gas seal are damaged.
Bearing damage
(7) oil leakage compressor sealing device near the impeller is a low pressure area, prone to oil leakage fault. The main reasons are:
Oil return oil is not smooth. The reason for return pipe plug, return pipe cross-sectional area is too small, pipe joint sealing pad hole is smaller than the return pipe diameter; diesel engine crankcase oil level is higher than the standard, resulting in the difficulty of returning oil; diesel engine crankcase ventilation obstruction or cylinder seal bad, gas leaking into the crankcase pressure increased.
Compressor O sealing ring damage or material aging and loss of sealing effect.
Turbocharger inlet pressure is too high. Normal pressure of 0.25~0.4 MPa, if the pressure is higher than 0.6 MPa, from the exhaust muffler nozzle will be found from the turbocharger turbine oil leakage.
Baotou North heavy truck parts seal is not installed correctly or damaged.