Combined Piezoelectric Fuel Injection-Electromagnetic Jet Mixed Fuel Injection Device

Abstract

The invention aims at providing a combined piezoelectric oil injection-electromagnetic air injection mixed fuel injection device. The combined piezoelectric oil injection-electromagnetic air injection mixed fuel injection device comprises a piezoelectric-electromagnetic control part, a double-needle-valve nozzle part, an injection device upper end cover and an injection device shell. The double-needle-valve nozzle is used for injecting fuel oil and fuel gas, space is saved, and an engine structure is simplified. The oil injection process is achieved through a piezoelectric control valve, air injection is achieved through an electromagnetic valve, and the injection device can only inject fuel oil or fuel gas, or inject the two kinds of fuel at the same time or sequentially inject the two kinds of fuel or can work in multiple modes through changing of the work states and the work sequence of the piezoelectric control valve and the electromagnetic valve. An engine can work in a pure diesel mode or a mode that fuel gas is ignited by fuel oil. The lift of a fuel oil needle valve controlled by a piezoelectric element can be adjusted, accordingly, the ignition oil injection rate can be adjusted, and the requirements of the engine for oil and gas mixing under different work conditions are met.

Description

technical field [0001] The invention relates to a fuel injection device, in particular to a dual-fuel engine injection device. Background technique [0002] With the continuous consumption of fossil fuels and the increasingly stringent emission regulations of internal combustion engines, the development of engines is facing the dual pressure of energy crisis and environmental pollution. The use of alternative fuels is an effective means to solve both energy problems and environmental pollution. Natural gas and petroleum gas have become the main substitute fuels for internal combustion engines due to their abundant resources, low price, clean combustion, and high calorific value. [0003] At present, there are two main fuel supply methods for dual-fuel engines: one is to mix the gaseous fuel with the inhaled air before it is introduced into the engine cylinder, and then directly inject a certain amount of liquid fuel near the top dead center of the combustion chamber, thereby...

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Problems solved by technology

[0003] At present, there are two main fuel supply methods for dual-fuel engines: one is to mix the gaseous fuel with the inhaled air before it is introduced into the engine cylinder, and then directly inject a certain amount of liquid fuel near the top dead center of the combustion chamber, thereby causing Gas fuel, this method is easy to cause engine knocking, in addition, when the engine is under low load, the pre-mixed gas is too thin to be conducive to combustion

Another method is to inject the gas directly into the combustion chamber, and also use the pilot amount of liquid fuel to trigger the combustion of the gas fuel. This method will not cause the engine to deflagrate prematurely, and the fuel burns in the diffusion combustion mode, and the combustion effect is good. , but it also has certain problems: First, the structure of the modern engine cylinder head is complex and there are many parts, so it is difficult to arrange two injectors. In addition, if two injectors are installed to inject dual fuel, the original The diesel engine has undergone major changes, increasing the complexity of device processing and assembly

Third, the injection device has high requirements for gas sealing. With the movement of the needle valve, the gas leaks upward along the gap between the needle valve coupler, and the leaked gas enters the control chamber, resulting in a decrease in the gas injection pressure and injection rate, which seriously affects the working stability of the device.

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