Supercharger provides pressurized gas for diesel engine, which makes fuel medium incineration more and more sufficient and maximizes diesel engine power. Therefore, the turbocharger is a main auxiliary equipment for diesel engine operation, so it is necessary to ensure its normal operation. However, the supercharger is a fine, high speed equipment, the probability of damage is high. In order to avoid the maximum extent of the turbocharger usually in the operation of the attack of damage, timely and accurate identification of the turbocharger damage factors, adopt accurate methods to eliminate the fault, listed the supercharger more damage phenomenon, analysis of damage factors and prior to and after the handling method, about the handling, especially for the first degree of handling is very necessary! Damage to the supercharger shell usually occurs at the exhaust end of the supercharger. Because the temperature of the exhaust gas end is high, the exhaust gas end contains sulfur that corrodes the shell greatly, so it is easy to form the shell corrosion breakdown of the exhaust gas end, and then the supercharger cooling chamber cannot operate normally, resulting in the supercharger cannot operate. This repair method is economical, reliable and effective. Usually iron cement repair can be used after half a year at the mercy of. Under this condition, it is not necessary to replace the supercharger shell, because the replacement of the supercharger shell cost is higher, the amount of engineering is larger, especially in the period of operation of the ship should not be completed. If you must replace the shell, to order second-hand spare parts, choose the appropriate opportunity to replace. At ordinary times, when handling every maintenance, the shell should be routinely inspected and recorded, so as to timely find the corrosion and damage, adopt the repair method, avoid increasing the damage, add the difficulty of repair and form unprepared.

Nozzle ring damage

The damage of nozzle ring is usually the deformation of nozzle ring. The elements of deformation are largely caused by the collision of foreign bodies. The foreign body comes from the exhaust valve and piston of the main engine, causing the debris and bolts and gaskets in the system to collide with the nozzle ring through the grille in front of the supercharger. After the nozzle ring is damaged, the supercharger will burst out surge and shock, usually pay special attention to the maintenance of other parts of the supercharger and the working condition of the host, ignore the view of the nozzle ring. When the supercharger surges and stirs, the model of the ship should be used to check whether the nozzle ring is deformed. Once the nozzle ring deformation is recognized, contact the professional manufacturer to remove it to the land workshop for repair by professional personnel. Usually, check the condition of the barrier and remove the debris in the system in time.

Damage to exhaust vane of supercharger

The damage of the gas guide ring at the exhaust gas end is usually due to groove and gas guide ring crack on the operating surface of the gas guide ring. Groove attack is the exhaust gas and impurities in the exhaust gas for a long time of erosion. The crack occurs because the thermal stress is too large and the thickness of the air guide ring becomes thinner. Damage to the gas guide ring at the exhaust end will seriously reduce the power of the supercharger, which usually goes unnoticed. When the main engine incineration is not good, power down, in most cases only the main engine and supercharger other aspects of the view, the results may not be addressed. If air guide ring appears groove and crack should undertake restorative repair. It is customary to check the appearance of the air guide ring during inspection.

The bearing of supercharger is damaged

There are many factors of bearing damage to the supercharger, usually the situation is :(1) the bearing device is not in place, the formation of the supercharger rotor axial string momentum is too large, increased the shock load of the bearing, so that the bearing smooth and shock reduction effect falls, in this situation, the supercharger long time operation will damage the bearing. (2) bearing is a second-hand spare parts, bearing ball rack and shock absorber function and life greatly reduced, once they damage will directly cause bearing damage. (3) unbalanced rotor causes bearing damage. The rotor is unbalanced because of various factors, so the unbalanced factors are not eliminated. The supercharger works under unbalanced condition for a long time and transfers the shock to the bearing damping plate. The damping plate is damaged first and then the bearing is damaged. (4) the bearing is directly damaged when the oil pump does not supply oil. Bearing in the case of oil break will be burned quickly, in the installation of bearing should be repeated to determine whether the bearing is in place, the best use of torque wrench according to the torque specification device bearing. Used bearings to shorten their operating cycle, usually controlled within 10,000 hours, to avoid the shock absorber and bearing frame damage caused by bearing damage. Each turbocharger maintenance to do dynamic balance test and repair. Take care not to damage the rotor when transporting and installing it. When the supercharger changes the oil, the oil tank should be added to the oil pump to avoid that the oil pump cannot set up vacuum.

Oil pump damage

Oil pump damage is usually gear meshing is not good, inhalation pipe damage. The underengagement of oil pump is mostly caused by the long operation time of oil pump. Suction pipe damage is caused by rotor shock forming tubing bracket shock, and then damage to the suction pipe. Oil pump according to the maintenance cycle sent to the professional factory for maintenance, do not rely on their own experience for general inspection. Regarding the second-hand oil pump should pay attention to the regular inspection repair. Usually in the handling to often check the pump suction pipe fixed condition, found loose fixed in time. Measure the pump runout to keep the pump operating within the allowable runout size.

The turbocharger rotor is damaged

The damage of turbocharger rotor is usually caused by other factors. Bearing damage, blade damage, blade scaling too much to form unbalanced and rotor transport and device damage, etc., will make the rotor damage. After the rotor is damaged, the shaft pulsation exceeds the limit, and the shaft head is damaged. Because the rotor's damage is not easily by the naked eye observation. In peacetime should be mindful of blade fouling conditions, particularly is a blade fouling too much, to remove fouling cannot handle problems for a while, to root out orderly fouling, otherwise will form a turbocharger rotor unbalance and the supercharger rotor damage. Supercharger is the main equipment of ships, because of its fine device, high speed, high probability of trouble. This puts forward a very high request for the handling of the event, to avoid the occurrence of the incident beforehand, in the event can timely identify the elements of the incident, the adoption of accurate methods, about the handling of the knowledge and experience is necessary.

Damage to exhaust vane of supercharger

The damage of blades is mostly caused by the collision of foreign bodies in the system. These come from piston orders in the system, exhaust valve fragments and bolts and gaskets dropped from the system, which pass through the grille and nozzle ring into the supercharger and break the exhaust gas end blade. Another damage factor is that impurities in the exhaust gas wash the blade for a long time, forming damage to the top of the blade, making the top of the blade become irregular shape and the blade height decrease. The damage of exhaust gas blade of the supercharger can easily lead to unbalanced supercharger, surge and decrease the operating efficiency of the supercharger. The exhaust gas blade should be broken to replace the blade. The top damage of the blade should be repaired in a restorative way. The top damage of the blade is usually not noticed, but the blade height is reduced too much, which will seriously affect the working efficiency of the supercharger, so it is necessary to repair. At ordinary times, to regularly check the system is not clean. Measure the blade height and compare with the standard blade height. It is also necessary to ensure that the cabin air is clean.