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柱塞泵的泵油机构包括两套精密偶件

(2009-04-27 08:37:10)
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柱塞泵

杂谈

    柱塞和柱塞套是一对精密偶件,经配对研磨后不能互换,要求有高的精度和光洁度和好的耐磨性,其径向间隙为0.002~0.003mm
  柱塞头部圆柱面上切有斜槽,并通过径向孔、轴向孔与顶部相通,其目的是改变循环供油量;柱塞套上制有进、回油孔,均与泵上体内低压油腔相通,柱塞套装入泵上体后,应用定位螺钉定位。
  柱塞头部斜槽的位置不同,改变供油量的方法也不同。 出油阀和出油阀座也是一对精密偶件,配对研磨后不能互换,其配合间隙为0.01 。
  出油阀是一个单向阀,在弹簧压力作用下,阀上部圆锥面与阀座严密配合,其作用是在停供时,将高压油管与柱塞上端空腔隔绝,防止高压油管内的油倒流入喷油泵内。
  出油阀的下部呈十字断面,既能导向,又能通过柴油。 出油阀的锥面下有一个小的圆柱面,称为减压环带,其作用是在供油终了时,使高压油管内的油压迅速下降,避免喷孔处产生滴油现象。当环带落入阀座内时则使上方容积很快增大,压力迅速减小,停喷迅速。

Plunger and the plunger is a sophisticated set of dual pieces, the pair are not interchangeable, after grinding, requires high precision and smoothness and good wear resistance, the radial clearance was 0.002 ~ 0.003mm
Cylindrical surface of plunger head chute cut there, and through the radial hole, the axial hole and at the top of the same, the purpose is to change the cycle of oil production; plunger has put into the system, back hole, with the pump the body cavity at the same low-pressure oil, pump plunger into the upper body suit, the application of positioning screw positioning.
Plunger head chute different location, change the amount of oil in a different manner. Valve seat and the oil is even a pair of precision parts, after the pair are not interchangeable grinding, and its clearance of 0.01.
Valve is a one-way valve, under pressure in the spring, the upper conical valve seat surface and close co-ordination role for the stop, it will be high-pressure pipeline isolation cavity with the plunger top to prevent the high pressure of the oil pipeline flows down inside the fuel pump.
Valve cross-section of the lower part was not only driven, but also the adoption of diesel. Valve of the cone there is a small cylindrical surface, known as the decompression zone, and its role in the supply end, so that the hydraulic high-pressure pipeline decreased rapidly to avoid the spray drop phenomenon resulting hole. When the ring fell into the seat so that when in the top of the volume increases rapidly, the pressure rapidly decreases rapidly停喷.
柱塞泵的泵油机构包括两套精密偶件柱塞泵的泵油机构包括两套精密偶件

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