Combined mechanical fuel injection-supercharged electromagnetic jet mixed fuel injection device

Abstract

The invention aims at providing a combined mechanical fuel oil injection and pressurizing electromagnetic fuel gas injection mixed fuel injection device. The mixed fuel injection device comprises a pressurizing part, a control part, a dual-needle-valve nozzle part and an injection device shell. A dual-needle-valve nozzle is adopted to inject the two fuels of fuel oil and fuel gas respectively, the space is saved, and the engine structure is simplified; an electromagnetic valve is adopted to control the fuel gas injection process, the fuel gas injection amount is precisely controllable, and the injection device can achieve multiple working modes of only injecting fuel oil or fuel gas, simultaneously injecting the fuel oil and the fuel gas, sequentially injecting the fuel oil and the fuel gas and the like. An engine can work in the modes of only adopting pure diesel oil and igniting the fuel gas through the fuel oil, and the working reliability is high. A pressurizing piston is adopted to pressurize the fuel gas, fuel gas pressurizing control is separated from fuel gas injection control, the fuel gas injection process can be freely switched between a pressurizing mode and a non-pressurizing mode, the fuel gas injection pressure is adjustable, a boot-shaped fuel gas injection rule of conducting injection from slow to rapid is obtained, and the requirements of the engine on fuel oil and fuel gas mixing under different working conditions are met.

Description

Technical field [0001] The present invention relates to a fuel injection device, specifically a dual-fuel engine injection device. Background technique [0002] With the continuous consumption of fossil fuels and the increasingly strict emission regulations of internal combustion engines, the development of engines is facing the dual pressure of energy crisis and environmental pollution problems. The use of alternative fuels is an effective means to solve energy problems and environmental pollution problems at the same time. Natural gas, petroleum gas, etc. have become the main alternative fuels for internal combustion engines due to their abundant resources, low price, clean combustion, and high calorific value. [0003] There are currently 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 o...

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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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