Electrically-controlled pump nozzle for injecting fuel of diesel motor

Abstract

The invention discloses an electrically-controlled pump nozzle for injecting fuel of a diesel motor, comprising plunger matching parts, a plunger spring, a plunger spring seat, an elastic collar, a rocking arm cushion block, fuel injector nuts, an electromagnetic valve and a fuel injector. The fuel injector and the electromagnetic valve are overlapped in fuel injector screw caps from bottom to top and are connected with the plunger matching parts in a pre-tightening way by using screw threads; the plunger spring, the elastic collar and the rocking arm cushion block are fixed on the plunger spring seat and are fixedly limited with the plunger matching parts by using pins, and the fuel-injection time of a pump nozzle is limited through an electronic control unit driving the high-speed electromagnetic control valve. In the invention, the precise and flexible control of the optimal fuel-injection amount, the optimal fuel-injection time and the fuel-injection pressure can be realized, the combustion in a motor cylinder is improved, harmful effluents of the motor are decreased, and the economical efficiency, the dynamic property and the intelligence of the motor are enhanced.

Description

technical field [0001] The invention relates to a nozzle for a diesel engine, in particular to a fuel injection electronically controlled pump nozzle for a medium-power diesel engine. Background technique [0002] Existing diesel engine fuel injection devices are mechanical synthetic pumps or electronically controlled unit pumps. The mechanical synthetic pump is composed of fuel injection pressure regulating mechanism, fuel injection quantity regulating mechanism, fuel injection time regulating mechanism and injection mechanism. The fuel injector of the electronically controlled unit pump has an independent oil pump, which is simplified in structure, but still retains the high-pressure pipeline. These two types of injection devices have low control precision, poor flexibility, and narrow control range. The road is long, there is pressure loss, the pressure of the fuel injection pump is usually lower than 1500bar, and pressure fluctuations such as residual pressure and refl...

AI Technical Summary

Problems solved by technology

These two injection devices have low control accuracy, poor flexibility, and narrow control range. The road is long, there is pressure loss, the pressure of the fuel injection pump is usually lower than 1500bar, and pressure fluctuations such as residual pressure and reflected waves will cause abnormal injection; there are various straight grooves and inclined grooves on the plunger, which increase leakage and reduce strength and stiffness , the pressure at the pump end is difficult to increase above 1300bar

Due to these shortcomings, mechanical synthetic pumps cannot meet Euro III and above emission standards

The electronically controlled unit pump also limits the increase in fuel injection pressure and the reduction of emission standards

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