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VE分配泵低压系统结构及原理
来源:http://hfduoyi.com2017/3/9 23:04:35

VE分配主要由低压系统、调速系统、自动定时装置、高压系统、停油装置及各种附加装置组成。在这其中低压系统之至关重要的一部分,下面我们了解一下VE分配的低压系统。

  VE分配泵低压系统包括调压阀、回油螺钉、滑片式输油泵等3个部件。了解这些部件的作用,掌握其结构和工作原理对使用和维护VE分配泵非常有利。

  1.DIAOYAFA

  VE分配泵泵室内的燃油压力不但要满足高压系统进油的需要,同时还要利用泵室内燃油压力的变化来控制提前器工作。因此,必须使泵室内在不同的工况下,都要有相对稳定的压力。为此,在泵体内装一调压阀控制进入泵室内的燃油压力。其主要由阀体、堵塞、调节弹簧、滑阀零件组成。工作原理如下:油泵在静态时,燃油压力等于零,滑阀在弹簧力的作用下,压到优越下位置,完全关闭了阀体上的回流孔。这时泵室内燃油与输油泵进油口油路隔断,随着油泵转速的升高,输油泵出口压力与泵转速成正比地上升,直到压力P对滑阀的推力大于调节弹簧的预紧力时,滑阀被顶到开始打开回流孔位置,部分燃油将回流到输油泵的进口油路里,输油泵出口压力P的上升速度得到控制。这时P的上升速度既受输油泵特性的影响,又受燃油回流量的限制。当转速进一步提高,滑阀在油压P的作用下继续上升,回流孔开度加大,回流量增加,相应产生更大的压力降,使输油泵出口压力P随转速上升速度减小,呈缓慢上升趋势。

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  2.HUIYOULUODING

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  3.HUAPIANSHISHUYOUBENG

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本文标题:VE分配泵低压系统结构及原理

 
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