Double-path oil-taking long needle valve hole plate type electronic fuel injector with carving grooves

Abstract

The invention aims at providing a double-path oil-taking long needle valve hole plate type electronic fuel injector with carving grooves. The fuel pressure in a control cavity is reduced slowly in the early stage of oil draining through the existence of oil outlet amount holes in a control plate, and consequently a long needle valve is uplifted slowly; along with the reduction of the pressure of the control cavity, the opening speed of the long needle valve is accelerated; and an oil inlet path is formed by a main oil channel, a third oil conveying channel, a connection oil channel surrounding a control valve rod, a middle oil channel, the oil outlet amount holes in the control plate and an annular side face oil channel to the control cavity surrounding the control plate, the pressure reduction speed of the fuel oil in the control cavity is accelerated, the long needle valve falling speed is increased, the movement of the long needle valve meets the requirement that rapidness is achieved after slowness in the whole working process, and it is guaranteed that the electronic fuel injector achieves the first slow and then quick oil injection law. The carving grooves with micrometer-level depths are formed in the surface of the long needle valve, the stability of hole flowing can be effectively improved, and the cavitation erosion of the fuel injector is reduced.

Description

technical field [0001] The invention relates to an engine fuel injector, specifically a high-pressure common rail fuel injector. Background technique [0002] As an advanced system of diesel fuel injection, the high-pressure common rail system separates the injection pressure generation from the injection process, and precisely and flexibly controls the fuel injection quantity and fuel injection timing. So that the diesel engine has good economical and emission characteristics, it has been widely used in the field of diesel engines, and the technology is gradually becoming mature. In the actual working process of a diesel engine equipped with a high-pressure common rail system, there is a problem of dynamic leakage of high-pressure fuel in the electronically controlled fuel injector in the components of the high-pressure common rail system. Part of the fuel will not participate in the work of the electronically controlled fuel injector, and will directly return to the low-p...

AI Technical Summary

Problems solved by technology

In the actual working process of a diesel engine equipped with a high-pressure common rail system, there is a problem of dynamic leakage of high-pressure fuel in the electronically controlled fuel injector in the components of the high-pressure common rail system. Part of the fuel will not participate in the work of the electronically controlled fuel injector, and will directly return to the low-pressure fuel tank through the low-pressure oil passage, resulting in waste of high-pressure fuel, a drop in fuel pressure in the common rail pipe, and a relative increase in power consumption

As the work of the injector increases gradually and the flow rate increases, the degree of cavitation and cavitation in the injector increases significantly, and the reliability of the injector decreases.

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