Dual-fuel injector and internal combustion engine

Abstract

The invention discloses a dual-fuel injector and an internal combustion engine, and belongs to the technical field of automobile internal combustion engines. The dual-fuel injector comprises an oil inlet assembly, a second midbody, an oil injection control assembly, a piezoelectric actuating mechanism and an injection assembly. The second midbody is connected to the bottom end of a first midbody;a first oil channel and a second oil channel penetrate through the first midbody and extend to the second midbody; the second midbody is provided with a gas inlet channel allowing natural gas to flowin; the oil injection control assembly is used for controlling oil injection and is arranged on the first midbody and the second midbody; the piezoelectric actuating mechanism is used for controllingair injection and is arranged on the second midbody and a transitional piece; the injection assembly is used for injecting fuel oil or natural gas, is arranged at the other end of a long needle valveand comprises a needle valve body, a nozzle sleeve and a coupling sleeve; the nozzle sleeve is arranged on the outer side of the needle valve body; and the coupling sleeve is arranged between the needle valve body and the nozzle sleeve. The dual-fuel injector has the advantages that independent control and injection of two kinds of fuel can be compatible, the use value for users is higher and theinjection response speed is higher.

Description

technical field [0001] The invention relates to the technical field of automobile internal combustion engines, in particular to a dual fuel injector and an internal combustion engine. Background technique [0002] The internal combustion engine is a kind of power machinery, which is a heat engine that directly converts the heat energy released into power by burning fuel inside the machine. At present, most of the internal combustion engines for medium and heavy vehicles, construction machinery and marine engines on the market use diesel as fuel, and a small part use natural gas as fuel. The injectors of internal combustion engines can only inject diesel or natural gas as a single fuel, that is, an internal combustion engine can only use diesel alone. One of the working modes in diesel fuel ignition mode or natural gas mode, it is easy to cause that when the price of diesel or natural gas fluctuates, the user cannot flexibly choose the working mode of the internal combustion ...

AI Technical Summary

Problems solved by technology

At present, most of the internal combustion engines for medium and heavy vehicles, construction machinery and marine engines on the market use diesel as fuel, and a small part use natural gas as fuel. The injectors of internal combustion engines can only inject diesel or natural gas as a single fuel, that is, an internal combustion engine can only use diesel alone. One of the working modes in diesel fuel ignition mode or natural gas mode, it is easy to cause that when the price of diesel or natural gas fluctuates, the user cannot flexibly choose the working mode of the internal combustion engine according to the real-time price of the fuel, and the actual use value of the user is low. Poor adaptability to fuel

[0003] In order to solve the above problems, a dual-fuel injector is now used. The housing of the dual-fuel injector is provided with a natural gas solenoid valve for controlling natural gas injection, a diesel solenoid valve for controlling diesel injection, and a needle valve inside it. The valve body of the gas valve; although it can realize the independent control and independent injection of diesel and natural gas dual fuels, which makes the fuel control more flexible; but the natural gas solenoid valve on the fuel injector is arranged at the head of the dual fuel injector. The gas valve is located at the bottom of the dual fuel injector, and the gas valve control chamber runs through the housing of the dual fuel injector, so that the volume of the gas valve control chamber is too large, and the speed of pressure change is slow, resulting in a slow response speed of the entire natural gas injection. Slow, making the internal combustion engine work less efficiently when using natural gas as fuel, and the structure is complex

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