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柴油机的引燃孔(起动喷孔)堵塞问题,一直困扰着许多机手和维修人员。过去大多认为引燃孔堵塞与主燃室内产生过多积炭有关,但实际使用中,许多烧、排机油或喷油雾化不好的机器,主燃室内虽积有厚厚的炭却不堵塞引燃孔,而一些工作状态良好甚至试车期间的机器却有引燃孔堵塞的情况。笔者经过无数次拆检发现,引燃孔堵塞的原因是起动时喷油嘴喷出的油束不能顺利通过引燃孔,使孔中积油,柴油机起动后油束不再从此通过,积油便在孔中形成积炭造成堵塞。 1.锥形孔不光滑。引燃孔是锥形的,许多孔壁留有明显的“台阶”,当起动喷油时,油束便会受到“台阶”的阻挡产生积油。起动后油束不从此经过,积油便形成
Diesel engine pilot hole (start nozzle) blockage problems, has been plagued many aircraft and maintenance personnel. Most of the past that the pilot hole plug and the main combustion chamber produced too much coke, but in actual use, many burning, row oil or spray atomization of bad machines, although the main combustion chamber has a thick carbon deposition but not Plug the ignition hole, and some work in good condition even during the test machine has the ignition hole is blocked. After numerous inspections, the author found that the reason for the clogging of the pilot hole is that the jet of fuel ejected by the injector can not smoothly pass through the pilot hole during start-up, so that the oil in the hole does not pass through after the diesel engine starts, It formed in the hole coke cause blockage. 1. The tapered hole is not smooth. The pilot hole is tapered, and many of the hole walls leave clear “steps,” and when starting fuel injection, the oil bundles are blocked by the “steps” to create oil accumulation. After the start of the beam does not pass, the oil will be formed