Solenoid-controlled accumulator-stabilized fuel injector

Abstract

The invention aims to provide an electromagnetic control pressure-storage and pressure-stabilizing oil sprayer. The oil sprayer comprises an oil sprayer head, an oil sprayer body, a flow limiting assembly, a needle valve reset spring, a spray nozzle, a needle valve, a cap nut, an electromagnetic valve assembly and a locking sleeve. The structure of the flow limiting assembly is adopted in the oil sprayer, therefore, fuel oil economy reduction caused due to the fact that the oil sprayer sprays oil abnormally and interruptedly can be effectively avoided and the working reliability of oil sprayer is guaranteed. A pressure storage cavity in the oil sprayer body can reduce pressure fluctuation caused in the fuel oil injection process and facilitate accurate control over oil spraying stability. Meanwhile, when the oil sprayer is used in a common rail fuel oil system, the structural size of a common rail pipe can be reduced, therefore, the requirements for strength of materials of the common rail pipe are reduced, the service life can be prolonged and the spatial utilization rate can be increased. The action process of the needle valve is directly driven by a solenoid valve, the response speed of the needle valve is high, the control precision is high, oil spraying is regular, flexible and changeable, the dynamic property and the economy of a diesel engine are effectively improved, and therefore the diesel engine can meet stricter emission regulations.

Description

technical field [0001] The invention relates to a fuel injector, specifically a diesel fuel injector. Background technique [0002] The traditional mechanically controlled fuel injector is mainly composed of the injector body, nozzle, needle valve couple, etc., with simple structure and high working reliability as the main advantages, but due to its injection timing, fuel injection pressure and fuel injection rate are limited. Due to the restriction of the cam shape of the high-pressure fuel supply pump, there are inflexible fuel injection characteristics, slow response, and low accuracy of fuel injection quantity control. It also cannot meet the requirements of the current market for engines. [0003] Compared with the mechanically controlled fuel injector, the electromagnetically controlled fuel injector applied to the diesel electronically controlled fuel injection system has a faster response speed, flexible and controllable fuel injection characteristics, and more prec...

AI Technical Summary

Problems solved by technology

Although the electromagnetically controlled fuel injector has improved the emission performance of the diesel engine, there are still some shortcomings: because there is a control piston above the needle valve, it has a certain restrictive effect on further improving the response speed of the fuel injector; at the same time, due to the The turbulent flow will be intensified during the fuel injection and fuel cut-off of the injector, causing severe pressure fluctuations in the fuel injection system, causing large fluctuations in the fuel injection pressure and fuel injection rate, and increasing the precise control of the fuel injection volume. Difficulty

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