1. Causes of serious wear of cylinder liner of natural gas generator set

活塞在缸套内壁高速运动，不可避免地会造成缸套的磨损。若气缸套在装配时的位置误差较大，或活塞环在装配时不符合技术要求，气缸套会很快出现严重磨损。

The high-speed movement of piston in the inner wall of cylinder liner will inevitably cause the wear of cylinder liner. If the position error of the cylinder liner is large during assembly, or the piston ring does not meet the technical requirements during assembly, the cylinder liner will be seriously worn soon.

2、气缸套发生裂纹的原因

2. Causes of cylinder liner crack

如厂家在铸造时存在缺陷，或是操作人员使用保养不当，在缸套外壁经过冷热突变、长时间超负荷运转或缸套外壁结冰时，都会造成缸套裂纹；若气缸套装配不正确，会造成气缸套和气缸体之间的配合间隙发生变化，导致气缸套在气缸体中产生歪斜现象。

If the manufacturer has defects in casting, or the operator does not use and maintain properly, the cylinder liner cracks will be caused when the outer wall of the cylinder liner goes through cold and hot mutation, long-time overload operation or the outer wall of the cylinder liner freezes; if the cylinder liner is not matched correctly, the matching gap between the cylinder liner and the cylinder block will change, resulting in the cylinder liner skew in the cylinder block.

 

3、天然气发电机组气缸套发生拉缸的原因

3. Causes of cylinder liner pulling of natural gas generator set

一般地，发生拉缸的原因有五种，一是活塞与气缸套之间的间隙较小；二是磨合期的保养没有按技术要求进行;三是装配的活塞环切口间隙过小；四是润滑油内固体颗粒较多；五是操作者在没有润滑油压力或润滑油压力较低时，快速地提高柴油发电机组转速。

Generally, there are five reasons for cylinder pulling: the first is that the clearance between piston and cylinder liner is small; the second is that the maintenance during running in period is not carried out according to the technical requirements; the third is that the clearance of piston ring notch is too small; the fourth is that there are more solid particles in lubricating oil; the fifth is that the operator can quickly increase the speed of diesel generator set when there is no lubricating oil pressure or the lubricating oil pressure is low.

4、气缸套产生穴蚀的原因

4. Causes of cavitation erosion in cylinder liner

气缸套发生穴蚀的原因一般有以下三种。一是厂家在铸造时存在缺陷；二是缸套与活塞间的配合间隙过大；三是缸套与气缸体之间的配合间隙过大。

There are three reasons for cavitation of cylinder liner. The first is that there are defects in casting; the second is that the fit clearance between cylinder liner and piston is too large; the third is that the fit clearance between cylinder liner and cylinder block is too large.

天然气发电机组气缸套易产生的故障

Trouble of cylinder liner of natural gas generator set

天然气发电机组的气缸套在长期的使用过程中，由于受到高温高压、冷却液的穴蚀破坏和机械应力的作用，易产生严重磨损、裂纹、穴蚀和拉缸等故障。当气缸套出现严重磨损后，会导致气缸内部压缩压力下降、功率降低等。

During the long-term use of the cylinder liner of natural gas generator set, due to the high temperature and high pressure, cavitation damage of coolant and mechanical stress, it is easy to cause serious wear, crack, cavitation and cylinder pulling. When the cylinder liner is seriously worn, the compression pressure and power in the cylinder will decrease.

若用一字旋具在飞轮监视孔拨动柴油发电机组飞轮齿圈，还会昕见漏气声；缸套出现裂纹或穴蚀后，气缸套可能会漏气，油底壳内部润滑油会进入冷却液。如果裂纹或穴蚀位置在活塞上止点以上，柴油发电机组起动后还会出现水箱(或散热器)向外反水的现象；柴油发电机组出现拉缸后的明显特征是转速下降、功率降低、润滑油温度升高和排烟增多等。

If you move the flywheel ring gear of diesel generator set with a straight bit in the flywheel monitoring hole, you will hear the sound of air leakage; after the cylinder liner cracks or cavitation, the cylinder liner may leak, and the lubricating oil in the oil pan will enter the coolant. If the crack or cavitation is located above the top dead center of the piston, the water tank (or radiator) will return to the outside after the start of the diesel generator set; the obvious characteristics of the diesel generator set after the cylinder pulling are the decrease of speed, the decrease of power, the increase of lubricating oil temperature and the increase of smoke exhaust.