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以PW 2000喷油泵为基础,通过喷油泵性能测试对比研究与分析,研究在高喷射压力强化条件下,等压出油阀偶件回油阀开启压力、回油孔直径、回油阀座面角度对喷油泵泵端压力、嘴端压力、残余压力、喷油规律综合性能及燃油液力系统穴蚀、二次喷射的影响规律与程度。研究表明,等压出油阀偶件回油阀开启压力的高低直接影响系统残余压力的大小,加大回油孔直径、降低回油阀开启压力、增加回油阀座面角度不同程度地增加了回油量,降低了残余压力,这有利于解决二次喷射问题,但对喷油定时稳定性及解决燃油液力系统穴蚀问题不利。
Based on the PW 2000 fuel injection pump, the performance of the fuel injection pump was compared and analyzed. The results showed that under the conditions of high injection pressure enhancement, the pressure of the equalizing discharge valve, the diameter of the oil return valve, Angle on the pump pump end pressure, pressure at the mouth, residual pressure, fuel injection law and the performance of the fuel hydraulic system cavitation, the impact of secondary injection rules and extent. The research shows that the opening pressure of oil return valve directly affects the size of system residual pressure, increases the diameter of oil return hole, reduces the opening pressure of return valve and increases the angle of return valve seat surface to varying degrees The amount of oil back to reduce the residual pressure, which is conducive to solving the secondary injection problem, but the injection timing stability and solve the hydraulic system of cavitation problems adverse.