Service HotlineAnd the malfunction that cannot be started. After disassembling the diesel engine, it was found that all six wet Qingzhou pump SL3NB1300 cylinder liners had varying degrees of pitting corrosion, and some parts had severe pitting corrosion. The reason for the cavitation of the SL3NB1300 cylinder liner of the Qingzhou pump is that the cavitation area of the SL3NB1300 cylinder liner of the Qingzhou pump appears on both sides of the outer surface of the cylinder liner along the direction of the connecting rod swing, with a honeycomb shaped hole group with a diameter of 1-5 mm and a depth of 2-3 mm. The main causes of cavitation in the SL3NB1300 cylinder liner of Qingzhou pump are analyzed as follows:
When the impact vibration diesel engine is working, the cylinder liner of Qingzhou pump SL3NB1300 is vibrated, and the outer wall cooling water generates local high pressure and high vacuum, which then evaporates to form small bubbles attached to the outer wall of Qingzhou pump SL3NB1300 cylinder liner. When the bubbles burst, a large impact pressure is generated. The outer wall of the cylinder sleeve of Qingzhou pump SL3NB1300 has been subjected to repeated strong shock and vibration of pressure waves for a long time, and its metal surface has fatigue damage, which first produces pitting, and then expands to foam or sponge like cavitation, or even perforation.
Manufacturing errors specifically include: excessive clearance between the SL3NB1300 cylinder liner and cylinder block hole of Qingzhou pump; The clearance between the piston and the SL3NB1300 cylinder liner of Qingzhou pump is too large; Deformation of connecting rod and excessive axial clearance of crankshaft; The cylinder liner wall of Qingzhou pump SL3NB1300 is relatively thin, the material is poor, and the manufacturing process has defects.
The cooling water is often contaminated with impurities and heavily polluted hard water, which can easily cause cavitation and damage to the SL3NB1300 cylinder liner of Qingzhou pump. The temperature of the cooling water is too low, and there is insufficient cooling water. Mixing different coolant can accelerate the damage to the outer wall of the SL3NB1300 cylinder liner of the Qingzhou pump.
During the operation of a chemical corrosion diesel engine, iron and iron carbide in the gas form micro cells in the high-temperature area of the upper part of the SL3NB1300 cylinder liner of the Qingzhou pump, resulting in chemical corrosion. Combined with impact and vibration, it accelerates the corrosion and pitting of the SL3NB1300 cylinder liner of the Qingzhou pump.
Preventive measures should be taken to reduce cavitation of the SL3NB1300 cylinder liner of the wet type Qingzhou pump for diesel engines, mainly from the aspects of manufacturing, maintenance, and use. Improving the quality of repair and assembly, including the cylinder block group, piston connecting rod group, crankshaft flywheel group, etc., and improving the dynamic balance of diesel engines can reduce the vibration intensity of the SL3NB1300 cylinder liner of Qingzhou pump.
The design and manufacturing department should take measures in structural design, material selection, processing technology, and surface processing quality to improve the corrosion resistance and wear resistance of the Qingzhou pump SL3NB1300 cylinder liner. If a protective layer is coated on the outer wall of the SL3NB1300 cylinder liner of the Qingzhou pump, it can improve the ability of the Qingzhou pump SL3NB1300 cylinder liner to resist pitting corrosion.
Reducing impact and vibration, adjusting the injection advance angle, injection pressure of the injector, and the uniformity of fuel injection in each cylinder to meet technical requirements, can reduce the impact of the piston on the SL3NB1300 cylinder liner of Qingzhou pump.
Reasonable use of coolant: The coolant temperature should not be too high or too low, and should be maintained within the range of 80-90 ° C. Soft water should be consistently used and the cooling water should be kept clean to promptly remove dirt from the water jacket.
Those who are familiar with the SL3NB1300 cylinder liner of Qingzhou pump should know that there are two types of cylinder liners: dry and wet. We should selectively purchase according to our own actual situation.
Let's first introduce the dry Qingzhou pump SL3NB1300 cylinder liner. The dry Qingzhou pump SL3NB1300 cylinder liner does not directly contact cold water, has a thin wall, and fits snugly with the cylinder block bearing hole, making it less prone to water leakage and wetting; Next, let's take a look at the SL3NB1300 cylinder liner of the wet Qingzhou pump. The SL3NB1300 cylinder liner of the wet Qingzhou pump is in direct contact with cold water, has a thick wall, good heat dissipation effect, and is prone to air and cold leakage.
The cylinder liners of Qingzhou pump SL3NB1300 are divided into two categories: dry Qingzhou pump SL3NB1300 cylinder liners and wet Qingzhou pump SL3NB1300 cylinder liners. The SL3NB1300 cylinder liner of Ganqingzhou pump has a thin thickness, simple structure, and easy processing. The SL3NB1300 cylinder liner of the wet Qingzhou pump comes into direct contact with cooling water, which is beneficial for engine cooling and the miniaturization and lightweighting of the engine.
The Qingzhou pump SL3NB1300 cylinder liner is the abbreviation for the engine gas Qingzhou pump SL3NB1300 cylinder liner. It is embedded in the cylinder of the cylinder block and together with the piston and cylinder head, forms the combustion chamber. The SL3NB1300 cylinder liner of the Qingzhou pump that does not come into contact with cooling water on the back is called a dry Qingzhou pump SL3NB1300 cylinder liner, while the SL3NB1300 cylinder liner of the Qingzhou pump that comes into contact with cooling water on the back is a wet Qingzhou pump SL3NB1300 cylinder liner.
