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众所周知,传统的喷油器的针阀锥角为60°或90°,它的阀座流道的流通面积向下逐渐减小,这就限制了每循环喷油量。本文提出了等截面流道的针阀理想型线的设想、理论和计算公式。受加工条件的限制,试验时使用简化型针阀型线。在油泵试验台上进行的试验表明:如果保持柴油机原有的全负荷循环油量不变,柴油机的针阀升程可降低44％,这样可大大减少针阀对阀座的冲击力,针阀副的使用寿命将得到延长。
As we all know, the traditional injector needle cone angle of 60 ° or 90 °, its flow passage area of the valve seat down gradually reduced, which limits the amount of fuel injection per cycle. In this paper, the concept, theory and calculation formula of the ideal line of the needle valve of the cross-section flow channel are proposed. Limited by the processing conditions, the test uses a simplified needle valve line. Tests carried out on the pump test bench show that if the diesel engine is maintained at its full full load cycle, the needle lift of the diesel engine can be reduced by 44%, which greatly reduces the impact of the needle valve on the valve seat. The needle valve Vice life will be extended.