Double-valve internal supercharged electronic controlled injector

Abstract

The invention discloses a double-valve internal supercharged electronic controlled injector. A first oil inlet passage and a second oil inlet passage are arranged in a shell of the injector, and the first oil inlet passage communicates with an oil storage cavity; the second oil inlet passage communicates with a balance cavity, and a control cavity is formed in the shell of the injector; a supercharging piston, a pressure relief piston and a driving mechanism are arranged in the control cavity, and a pressure relief oil passage is arranged on the surface of the pressure relief piston; a pressurized oil cavity is formed in the shell of the injector, the upper part of the pressurized oil cavity communicates with an upper oil passage, and the lower part of the pressurized oil cavity communicates with a lower oil passage; and the supercharging piston closes the upper oil passage under the action of the driving mechanism while pressurizing the pressurized oil cavity. According to the double-valve internal supercharged electronic controlled injector, the pressure relief piston is pushed to move through the driving mechanism, and high and low pressure oil passages are in communication witheach other through the pressure relief oil passage, the sealing problem caused by an existing injector controlling the communication of the high and low pressure oil passages through a ball valve issolved, and on the other hand, the driving mechanism is used for pushing the supercharging piston to achieve secondary pressurization of fuel to achieve better injection pressure and high-precision oil injection of the fuel.

Description

technical field [0001] The invention relates to a dual-valve internal booster electronically controlled fuel injector. Background technique [0002] Existing electronically controlled fuel injectors are generally composed of electromagnets, armatures, ball valves, release control holes, oil filling control holes, needle valve stems, nozzle needle valve pressure rings and spray holes. The principle is: when the electromagnet is energized, it will generate electromagnetic force, attract the armature, and at the same time the ball valve will open, and the high-pressure fuel will return to the oil through the release control hole. Since the fuel pressure at the lower part of the pressure ring of the nozzle needle valve is relatively high, the pressure difference Under the action, the needle valve rod moves upward, the needle valve opens, and the fuel is sprayed out through the injection hole to realize fuel injection. When the electromagnet is powered off, the armature resets u...

AI Technical Summary

Problems solved by technology

The tightness of the control room is affected by the pressure of the ball valve acting on the cone surface. If the seal is not tight, the needle valve of the oil nozzle will not open normally.

At the same time, the pressure of the high-pressure fuel in the existing electronically controlled fuel injector is the pressure of the fuel in the high-pressure fuel pipe, and its atomization effect is affected by the output fuel pressure of the high-pressure fuel pump.

If the diesel engine is running at a low speed, the fuel pressure output by the high-pressure fuel pump is relatively low, so the atomization effect after being sprayed out by the fuel injector becomes poor, resulting in a decline in the combustion effect

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