Combined Mechanical Injection-Piezoelectric Jet Mixed Fuel Injection Device

Abstract

The invention aims at providing a combined mechanical fuel oil injection and piezoelectric fuel gas injection mixed fuel injection device. The mixed fuel injection device comprises a pressure adjusting spring, a piezoelectric control part, a mechanical nozzle, a fuel gas nozzle, a fuel gas inlet channel, a fuel oil inlet channel and the like. The mechanical nozzle is used for achieving fuel oil injection, the piezoelectric control part is used for controlling the fuel gas nozzle to achieve fuel gas injection, the flexibility of fuel injection is high, and switching of pure fuel oil injection and fuel oil and fuel gas dual-fuel working injection can be achieved; a piezoelectric element is adopted to control motion of a needle valve of the fuel gas nozzle, the needle valve lift is adjustable, and the control accuracy of the fuel gas injection amount and fuel gas injection rate is high; fuel oil in a needle valve cavity of the fuel gas nozzle and fuel oil at needle valve matching parts of the fuel gas nozzle are the same oil, the oil pressures are equal, and static leakage of the fuel oil at the needle valve matching parts is avoided; fuel gas of the fuel gas nozzle is sealed with the fuel oil, the situation that the fuel gas is leaked through the needle valve matching parts is avoided, the fuel gas injection pressure and injection speed are increased, and the power property of an engine and the fuel economical efficiency are improved.

Description

technical field [0001] The invention relates to a fuel injection device, in particular to a fuel injection device for a dual-fuel engine. Background technique [0002] The development of alternative fuels for engines is one of the very effective means to solve the problems of energy shortage and environmental pollution. Due to the advantages of abundant reserves, low price and low pollution emissions, gaseous fuel has become an alternative fuel for engines with good development prospects. Although the gas engine using only one gas fuel has clean emissions, the gas fuel used has low energy density, high fuel consumption, and limited use direction; while the dual-fuel engine using diesel as the pilot fuel and gas fuel as the main fuel can be used in Flexible switching between the two fuels, high fuel substitution rate, good power, economy and emissions. [0003] The existing in-cylinder direct-injection dual-fuel engines mostly use gas nozzles and mechanical nozzles to achie...

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Problems solved by technology

[0003] The existing in-cylinder direct-injection dual-fuel engines mostly use gas nozzles and mechanical nozzles to achieve dual-fuel injection, wherein the gas nozzles are controlled by solenoid valves to achieve gas injection, and mechanical nozzles to achieve fuel injection. The disadvantages are: gas nozzles It is independently installed on the cylinder head with the mechanical nozzle, and the size and installation position are limited by the cylinder head; the gas nozzle uses the pressure gas to prop up the needle valve, but due to the strong compressibility of the gas, it is not conducive to the precise control of the needle valve movement, and the gas injection Unstable; during the gas injection process, with the movement of the needle valve, the gas leaks to the solenoid valve end through the gap between the needle valve and the valve body, resulting in a decrease in the gas injection pressure and injection rate, which has adverse effects on the stability of the gas injection impact, affecting engine power and fuel economy

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