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Telephone:13605213465
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Product Description
Unit pump refers to a cylinder of an oil pump, the oil pump here refers to the high-pressure pump, or as a fuel injection pump. The whole pump means that all cylinders share a high pressure oil pump. Unit Pump body and the pump overall than done relatively large, such as high power diesel engine are generally single pump, in addition Unit Pump if damage to the oil pump only needs to replace a pump without the need to like the whole pump that all replacement and lower cost.
单体泵指一个气缸一个油泵，这里的油泵指的是高压油泵，或称为喷油泵。整体泵指所有气缸共用一个高压油泵。单体泵与整体泵相比可以做得比较大，如大功率柴油机一般都是单体泵的，另外单体泵如果油泵损坏只需要更换一只油泵而不需要像整体泵那样全部更换，成本更低。
摊铺机
Question: monomer pump working principle and working process?
Answer: (1) working principle: electronic unit pump injection separated into the following phases: Unit Pump lectromagnetic valve installed in the upper part of the Unit Pump, solenoid valve power, the oil return opening, Unit Pump plunger even have begun to pump oil system in the process, also cannot establish a high, only when the solenoid valve is energized, oil return channel is closed, oil pressure is increased rapidly; the fuel high-pressure after high-pressure tubing into injector so that the fuel injection. When the electromagnetic valve is cut off, the oil return oil channel is opened, and the relief pressure of the oil injection stops.
Solenoid valve power continues to determine the amount of circulation.
(2) oil filling process: solenoid valve is not energized, when the piston moves down, injection pressure will be lower than the low fuel injection pressure. At the same time, the low pressure system fuel through the plunger oil inlet into the high-pressure injection system.
(3) to bypass the process: when the rise of the plunger, plunger fuel is compressed, but if the electromagnetic valve is in a power down state, then fuel pressure in the piston chamber will by oil pressure relief valve opening pressure, far below the injector opening pressure; then the fuel will be through the oil return passage to the oil tank.
(4) injection process: the rise of the plunger in the process, if the electronic control unit (ECU) at a particular moment in time issued a controlled fuel injection pulse signal, solenoid valve, then back to oil channel is closed, the plunger cavity formed a closed volume, with the rise of the plunger, the Feng Birong area in the fuel is compressed, pressure to rise rapidly, and injector nozzle pressure also increased sharply. When the pressure is higher than the injector opening pressure (about 300bar), the injector is open, the fuel is sprayed into the combustion chamber. Maximum injection pressure up to 1800bar. (5) unloading process:
When the fuel injection pulse signal is controlled, the electromagnetic valve is cut off, the oil return channel is re opened, the fuel oil is overflow, the plunger cavity and the nozzle pressure drop rapidly, the nozzle is closed, and the spray process is finished.
问：单体泵工作原理及工作过程？
答：（1）工作原理：电控单体泵喷射系统的工作过程分为以下几个阶段：单体泵电磁阀安装在单体泵的上部，电磁阀断电时，回油道打开，单体泵内的柱塞即使已开始泵油，也不能建立高压，只有当电磁阀通电时，回油油道关闭，油压才迅速升高；高压燃油经过高压油管进入喷油器使其喷油。电磁阀断电时，回油油道打开，迅速溢流卸压，喷油停止。
电磁阀通电的持续时间决定了循环供油量。
（2）充油过程：电磁阀不通电，当柱塞下移时，喷射系统内部压力将低于低压油路的喷油压力，此时低压系统燃油将通过柱塞套上的进油口进入高压喷射系统。
（3）旁通过程：当柱塞上升时，柱塞腔里的燃油被压缩，但是如果电磁阀仍处于断电状态，那么柱塞腔里的燃油压力将由回油溢流阀的开启压力决定，远低于喷油器的开启压力，这样燃油将通过回油通道流回到油箱。
（4）喷射过程：柱塞上升过程中，如果电控单元（ECU）在某个特定时刻发出了一个控制喷油脉冲信号，使电磁阀通电，这时回油通道被关闭，柱塞腔形成了一封闭容积，随着柱塞上升，封闭容积里的燃油被压缩，压力迅速上升，并且喷油器的嘴端压力也急剧上升，当压力高于喷油器的开启压力（约300bar）时，喷油器打开，燃油喷到燃烧室中。最高喷射压力可达1800bar。（5）卸荷过程：
当控制喷油脉冲信号终止时，电磁阀断电，回油通道重新打开，燃油由此溢流，柱塞腔以及喷嘴压力迅速下降，喷嘴闭合，喷射过程结束。
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3. Delivery times:7-15 Days
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Phone:13605213465
Tel:0516-85859756
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