Zero-backpressure electronically-controlled diesel injector driven by magnetostrictive component

Abstract

The invention discloses a zero-backpressure electronically-controlled diesel injector driven by a magnetostrictive component, which comprises a diesel injector shell provided with a diesel inlet passage and a diesel return passage, a nut cap, a magnetostrictive actuator, a zero-backpressure two-position three-way valve, a lock nut, an adjusting shim, a transition block, a return spring, a pressure spring and injection nozzle matching parts. The return spring, the transition block, the zero-backpressure two-position three-way valve, the adjusting shim, the lock nut, and the magnetostrictive actuator are orderly arranged in the diesel injector shell along the axial direction. The pressure spring and the injection nozzle matching parts are orderly arranged in the nut cap. The upper end surface and the lower end surface of the diesel injector shell, the two end surfaces of the transition block, the two end surfaces of the zero-backpressure two-position three-way valve, the two end surfaces of the adjusting shim and the lower end surface of the magnetostrictive actuator are high flatness plane; and the end surfaces of the components are connected tightly with one another to form a seal. Thus, a mechanism of which the magnetostrictive actuator controls the axial movement of a valve needle of an injection nozzle of the zero-backpressure two-position three-way valve under high-pressure diesel condition is formed. The diesel injector can realize more precise and high-frequency high pressure diesel injection.

Description

Technical field: [0001] The invention relates to a fuel injector used in an electronically controlled diesel engine fuel injection system, in particular to an electronically controlled diesel fuel injector driven by a magnetostrictive element using common rail electronically controlled fuel injection technology. Background technique: [0002] At present, the fuel supply system of the common rail electronically controlled diesel engine uses an electromagnetic injector to inject high-pressure diesel into the cylinder. Since the electromagnetic coil of the electromagnetic injector has a certain degree of inductance when it works, it is difficult to respond to the requirements of higher injection frequency. , which limits the development of diesel engines in the direction of lower fuel consumption, cleaner emissions, and lower noise. Moreover, the two-position three-way valve used in the injector of the electronically controlled injector has a large force due to back pressure. R...

AI Technical Summary

Problems solved by technology

[0002] At present, the fuel supply system of the common rail electronically controlled diesel engine uses an electromagnetic injector to inject high-pressure diesel into the cylinder. Since the electromagnetic coil of the electromagnetic injector has a certain degree of inductance when it works, it is difficult to respond to the requirements of higher injection frequency. , which limits the development of diesel engines in the direction of lower fuel consumption, cleaner emissions, and lower noise. Moreover, the two-position three-way valve used in the injector of the electronically controlled injector has a large force due to back pressure. Requires greater control to control

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