某型号柴油机漏气量高故障分析
2021-09-10卞光祥叶飞齐行飞
卞光祥 叶飞 齐行飞





摘要:针对某型号柴油机漏气量异常偏高进行故障原因分析,最终确定故障初始原因为机油滤清器总成漏装旁通阀。含有异物杂质的机油直接通过机油滤清器总成漏装的旁通阀通道(不经过机滤滤芯)进入各摩擦配副,并破坏其对高压气体的密封作用。随着柴油机持续运行,最终导致漏气量持续恶化超限值。
Abstract: The missing bypass valve of oil filter assembly has been confirmed as the original cause of high blow-by failure according to the failure analysis of one type of diesel engines. The function of friction pairs as high-pressure gas sealer was affected/destroyed since the engine oil with impurities went straightly through the route of the oil filter assembly without a bypass valve (without passing machine filter element) and entered into each friction pair. With continuous running of the diesel engine, the amount of air leakage kept increasing and then exceeded the specified limit in the end.
關键词:柴油机;漏气量;机油滤清器总成;故障分析
Key words: diesel engine;blow-by;oil filter assembly;failure analysis
中图分类号:TK428 文献标识码:A 文章编号:1674-957X(2021)10-0121-03
0 引言
除了动力性、经济性等常规指标,漏气量也是评判柴油机性能特点及运行状态的一个重要指标。发动机漏气量主要是指高压气体通过各配副密封面进入曲轴箱后,从曲轴箱通风管路中逃逸出的气体流量,主要分为活塞漏气量、气门导管漏气量、增压器漏气量、空压机漏气量等。定型柴油机的漏气量,在使用过程中的变化通常直接反映各摩擦配副或相关零部件是否工作正常。漏气量过低通常意味着相关摩擦配副配合过于紧密,在使用过程中会导致相关摩擦配副润滑不良并加速其磨损,进而影响发动机寿命。漏气量过高通常意味着相关摩擦配副密封不良,进而会产生机燃油消耗增加、机油老化加速、排放恶化、活塞等零部件散热不良等一系列负面影响。因此,需要将发动机漏气量控制在合理范围内。本文针对某型号柴油机运行过程中漏气量异常偏高故障进行排查分析。
1 故障描述
某型号柴油机……
