Resonance hole-plate type electronic control fuel injector with carved grooves

Abstract

The invention aims to provide a resonance hole-plate type electronic control fuel injector with carved grooves. The resonance hole-plate type electronic control fuel injector comprises a fuel injector body, a flow-limiting valve assembly, an electromagnetic valve, a needle valve assembly and a jet nozzle. The fuel injector body is internally provided with a pressure accumulation cavity which communicates with a main fuel inlet and the flow-limiting valve assembly, so that stability of fuel injection processes of all cylinders is guaranteed in the large-pulse-width fuel injection process. The bottom of the flow-limiting valve assembly is provided with a resonance through hole and a resonance throttling hole, and fluctuation of fuel passing through the flow-limiting valve assembly is effectively reduced. Through two-path fuel feeding of a hole-plate throttling hole and an annular side face fuel path, the pressure building-up process of a control cavity is accelerated, and the falling response speed of a needle valve is increased. The surface of the needle valve is provided with the grooves of micron-level depth, hole flowing stability can be effectively improved, and the cavitation erosion degree of the fuel injector is lowered. Through a hole-plate structure machined in the needle valve assembly, the dynamic fuel return quantity in the fuel spraying process is effectively reduced, and the effect of micro-dynamic fuel return is achieved.

Description

technical field [0001] The invention relates to an engine fuel injection device, in particular to a high-pressure common rail fuel injection device. Background technique [0002] At present, the market is gradually adopting high-speed solenoid valve injectors to meet the latest emission regulations. The prominent feature of this electronically controlled fuel injector is to use the electrical signal output by the electronic control unit to control the high-speed solenoid valve to achieve flexible fuel injection rules. The fuel injector with high-speed solenoid valve has fast system response, high control precision and the ability to inject multiple times. But this electronically controlled fuel injector also has a place to be improved: during the fuel injection process, there is always high-pressure fuel flowing through the inlet and outlet orifices. This part of high-pressure fuel is pressurized by the oil pump, but returns directly to the fuel tank without doing any work...

AI Technical Summary

Problems solved by technology

This part of high-pressure fuel is pressurized by the oil pump, but it returns directly to the fuel tank without doing work. The dynamic oil return is large, resulting in energy loss

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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