Dual-fuel electric control monomer ejector

Abstract

The invention aims at providing a dual-fuel electric control monomer ejector, which comprises an ejector body, and a control diesel oil electromagnetic valve, a control natural gas electromagnetic valve, a control piston, a needle valve, a needle valve offsetting spring and a nozzle which are arranged in the ejector body, wherein the ejector body is provided with a diesel oil inlet, an oil discharge port and a natural gas inlet, a control room, an oil storage room and a gas storage room are arranged in the ejector, the diesel oil inlet is respectively communicated with the control room, the oil storage room and a fuel pipe of an engine, the natural gas inlet is communicated with the gas storage room, the control diesel oil electromagnetic valve is arranged above the control room, a control piston is arranged below the control room and is connected with the needle valve, the control natural gas electromagnetic valve is arranged outside the needle valve, the nozzle is arranged on the lower end of the ejector body, and the needle valve offsetting spring is arranged between the needle valve and the ejector body. According to the invention, less lean mixture of fuel ignition air and natural gas is ejected at an initial ejection stage, the ejection performance of the fuel and the atomizing effect are improved, and emission and economy of the engine are improved.

Description

technical field [0001] The invention relates to a diesel engine, in particular to a fuel injection device for the diesel engine. Background technique [0002] With the rapid increase in the number of automobiles and ships, the harmful emissions of engines have an increasingly serious impact on the human living environment. Therefore, it is imminent to solve engine exhaust pollution as soon as possible; at the same time, the ever-increasing contradiction between fuel supply and demand restricts the The further development of modern engines advances. These are prompting countries around the world to formulate various strict emission regulations to regulate the production and use of various engines, and at the same time begin to vigorously develop mixed-fuel clean engines to optimize the energy supply structure and achieve fuel diversification, and improve the efficiency of comprehensive energy utilization. . [0003] In order to realize the dual fuel supply of the engine, an...

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Problems solved by technology

[0003] In order to realize the dual fuel supply of the engine, and realize the simultaneous or separate injection of two fuels and its flexible adjustment, the electronically controlled fuel injection device of the existing engine is obviously not satisfactory, and the engine must be refitted to a certain extent, such as The German MAN company used two injectors to inject diesel and natural gas into the cylinder respectively on a separated diesel engine combustion chamber. Larger changes are made, more accessories are added, and the installation becomes cumbersome and complicated, which limits the scope of application of the dual-fuel diesel engine and reduces the economy

[0004] In order to improve the atomization degree of liquid fuel, increase the combustion surface area of ​​the injected fuel, accelerate the heat and mass exchange rate during combustion, and maximize the thermal efficiency of fuel, the existing engine is committed to continuously increasing the fuel pressure. The large diesel engine The fuel injection pressure can reach about 160MPa, but the increasing fuel pressure will cause engine reliability problems, such as: due to the increase of fuel injection pressure, the tension and compression stress of the material will increase, which will aggravate the wear of the fuel injection pump and fuel injection devices , plastic deformation, or even fatigue fracture damage due to long-term work under a large load, which has an adverse effect on the safety and economy of the engine.

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