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轴针式喷油器使用一段时间后,经常出现喷油嘴关闭不严、雾化不良,甚至喷油压力调不上去等故障。有时更换新喷油嘴、新弹簧或在弹簧端面添加垫片,仍不见效,最终只得更换喷油器总成。出现上述故障,除了销针与喷孔的配合、喷油嘴密封、针阀导向面及导向孔表面被损坏外,还有钢球磨损问题。轴针式喷油器的结构原理是:当喷油嘴与喷油器体紧固后,调压弹簧在调整螺钉的作用下,通过顶杆将针阀的密封锥面压紧在针阀体相应的锥面上。当喷油泵供油时,高压柴油进入针阀体环形油腔,作用在针阀锥面上,产生向上推力,克服调压弹簧压力后,使
After using the needle-type injector for a period of time, it often happens that the injector is not closed properly, the atomization is poor, and even the injection pressure can not be adjusted. Sometimes the replacement of a new nozzle, a new spring or the end of the spring to add gaskets, still not effective, and ultimately had to replace the fuel injector assembly. In addition to the above pinpointing, in addition to the cooperation of the pin and the nozzle hole, the sealing of the nozzle, the guide surface of the needle valve and the surface of the guide hole are damaged, there is also the ball wear problem. Axial needle injector structure principle is: When the nozzle and injector body fastening, the pressure regulating spring in the role of the adjusting screw, the needle through the mandrel will seal the sealing cone in the needle valve body The corresponding cone. When the fuel injection pump, the high-pressure diesel into the needle valve ring oil chamber, acting on the needle cone, resulting in upward thrust to overcome the pressure regulating spring, so that