Supercharged leak-free piezoelectric control gas injection device

Abstract

The invention aims to provide a pressurization no-leakage piezoelectric control type gas injection device; and the device comprises a gas pressurization part, a piezoelectric control part, a gas nozzle part, a piezoelectric element, an injection device shell, a needle valve limiting rod, a needle valve return spring, a pressurization oil inlet way, a pressurization oil drainage way, an air inlet, an air intake channel, a control oil inlet way, a control oil return way, a center oil way, a sealing oil inlet way and the like. The pressurization oil inlet way enters the gas pressurization part; the control oil inlet way enters the gas nozzle part through the piezoelectric control part and the needle valve limiting rod; the sealing oil inlet way enters the gas nozzle part through the injection device shell; and the air intake channel enters the gas nozzle part through the gas pressurization part, the piezoelectric control part and the injection device shell. The pressurization no-leakage piezoelectric control type gas injection device is high in gas injection stability and consistency, can satisfy the system injection rule variability requirement, and can preferably solve the problem of gas leakage through a needle valve matching part.

Description

technical field [0001] The invention relates to an engine, specifically a gas injection device for a dual-fuel engine. Background technique [0002] At present, gaseous fuel (such as natural gas), which is one of clean new energy sources, has attracted people's attention due to its advantages of abundant reserves, low price and low pollution emissions. Therefore, the use of gaseous fuel as an alternative fuel for engines has a good development prospect. Engines burning gaseous fuel mainly include spark ignition single-fuel gas engines and diesel ignition dual-fuel engines. Although the spark-ignition single-fuel gas engine has clean emissions, the gas fuel used has low energy density, high fuel consumption, and limited use direction; while the diesel-ignition dual-fuel engine can flexibly switch between the two fuels when used, fuel substitution High efficiency, good power, economy and emission. [0003] The existing in-cylinder direct-injection dual-fuel engines mostly us...

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Problems solved by technology

[0003] The existing in-cylinder direct-injection dual-fuel engines mostly use an electromagnetically controlled gas injection device, and use a high-pressure pump to compress the gas to a specified pressure. The disadvantages are: the high-pressure pump has a complex structure and there are matching problems, and the boosted gas is transferred from the high-pressure pump The path to the gas injection device through the common rail pipe is long, and the pressure fluctuation is large; the gas injection device uses pressure gas to lift the valve core, but due to the strong compressibility of the gas, it is not conducive to the precise control of the valve core movement, and the gas injection is unstable; In addition, during the gas injection process, with the movement of the valve core, the leakage of gas to the solenoid valve end through the gap between the valve core and the valve body intensifies, resulting in a decrease in the gas injection pressure and injection rate, which has a negative impact on the stability of the gas injection , affecting engine power and fuel economy

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