【摘要】 对缸径为60～75mm涡流室柴油机喷油嘴结构和喷油过程进行了深入研究。分析造成匹配不合理的主要原因,从喷油嘴着手进行改进。通过减小针阀升程来相应的得到合理的喷油嘴流通面积,采用双锥面的针阀头部形状来减小压力室容积,减小针阀直径和升程来减小泵吸容积,得出喷油嘴结构参数的优化设计方案,并以165型柴油机为样机试验验证。结果表明喷油压力提高,喷油持续期合理,整机经济性得到改善,排烟降低。更多还原

【Abstract】 The in depth study of the structure of injection nozzles and the injection process has been carried out for the swirl chamber diesel engines with diameters from 60~75mm. Major causes of unreasonable matching were analyzed and the beginning of nozzles was improved. A reasonable passing area of nozzle correspondingly by reducing the lift of needle was obtained and the volume of press room was decreased by adopting bi-cone designed needle head; also decreased the volume of pump-suck through smaller diameter and lift of needles. Therefore, the settings of structure coefficients of nozzles were optimized. And there was tested on 165-diesel engine as instance. Results including increas of the pressure of fuel injection; reasonableness of duration of fuel infection; improvement of the economical performance of the engine and decreasing of the release of smoke were obtained.更多还原