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笔者在一次压缩机检修中发现这样一种现象,有一台6AW—12.5氨压缩机,它的油泵是由压缩机主轴带动。当压缩机由启动到投入正常运转时,压缩机汽缸内有金属的敲击声,每当曲轴旋转一周,这种响声将重复一次,并且声音是由大变小逐渐消失。经过二十四小时运行,压缩机的所有运行参数都在正常范围之内,且能使库温下降,当按下压缩机的停止按扭,汽缸内的敲击声又开始由小变大逐渐响起来,直至响到电机停止转动为止。打开缸盖和侧盖检查,用铝丝压入法测量了活塞上死隙和连杆大头轴瓦与曲柄销径向间隙,发现该两处间隙都在正常范围之内,因此排除了这两处可能出现的故障,继而将活塞连杆体全部从压缩机中拿出来,检查6个缸的活塞销与小头衬套配合情况,发现小头衬套
The author found such a phenomenon in a compressor overhaul, there is a 6AW-12.5 ammonia compressor, the pump is driven by the compressor spindle. When the compressor is started up and put into normal operation, there is a metal percussion sound in the compressor cylinder. Whenever the crankshaft rotates for one week, the sound will be repeated once and the sound gradually disappears from large to small. After twenty-four hours of operation, all operating parameters of the compressor are within the normal range, and can make the library temperature drop, when you press the compressor stop button, the percussion in the cylinder began to change from small to large gradually Sounds until it stops until the motor stops. Open the cylinder head and side cover inspection, with aluminum wire into the law measured on the deadbolt and connecting rod bearing bush and crankpin radial clearance and found that the gap between the two are within the normal range, thus excluding the two Possible failure, and then all the piston rod body out from the compressor to check the six cylinder piston pin and head bush with the situation, found that the small head bushings