A Solenoid Valve Injector with Adjustable Fuel Pressure

Abstract

The invention discloses an electromagnetic valve fuel injector with adjustable fuel pressure. The adopted technical scheme includes the top of the fuel injector, the body of the fuel injector, and the nozzle. The conical platform at the small end of the needle valve in the nozzle is connected by a thread pair; the injector body and the valve sleeve are connected by a thread pair, and the valve sleeve protrusion provided at the upper end of the valve sleeve and the armature provided at the lower end of the armature A return spring for returning the armature is installed between the protrusions. The advantages are as follows: due to the different fuel injection volumes and injection pressures required under different working conditions of the engine, the pressure regulating gasket is used in the present invention to engage with the valve sleeve with external threads, and the spring is adjusted by the armature protrusion and the valve sleeve protrusion Preload, so as to achieve the purpose of adjusting the injector pressure.

Description

technical field [0001] The invention relates to a solenoid valve fuel injector. Background technique [0002] At present, most automobiles use solenoid valve injectors, which can quickly respond to the fuel injection signal of the automobile ECU and control the opening of the solenoid valve. The electromagnetic armature is often connected with the push rod, valve seat, needle valve body and other components to control the fuel injection process together. In addition, a spherical surface or a conical surface is generally used as the pressure bearing surface of the pressurized fuel, and the fuel return line is arranged at the top part of the injector body. The matching accuracy of the needle valve and the needle valve body is less than 3um, and the matching accuracy of the curved surface of the ball valve body and the valve seat is less than 8um. However, most of the solenoid valve injectors cannot adjust the fuel pressure of the injector according to the specific situation,...

AI Technical Summary

Problems solved by technology

However, most of the solenoid valve injectors cannot adjust the fuel pressure of the injector according to the specific situation, and the manufacturing process for the injector needle valve is relatively complicated, such as the manufacture of the ball valve body, the manufacture of the shaft needle, and the oil return line of the injector. It is generally installed at the top of the injector where parts are densely installed, such as hollowing out part of the electromagnetic armature to install an oil return pipe or setting an oil return valve

The cooperation between the needle valve and the needle valve body, the cooperation between the ball valve body and the valve seat and other precision requirements are very high, and the use of Kong injectors also has serious carbon deposition problems (affecting the fuel injection volume and fuel injection angle)

When the metal surface sealing method is used in fuel injection, especially in high-pressure injection, there is more oil return, which affects the fuel injection volume and fuel injection pressure

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