Combined type supercharged dual-piezoelectricity gas jetting device

Abstract

The invention provides a combined type supercharged dual-piezoelectricity gas jetting device. The combined type supercharged dual-piezoelectricity gas jetting device is formed through combination of a supercharging device and two gas nozzles adopting the same structure. An electromagnetic valve is used for controlling the supercharging of gas through a supercharging piston, the supercharging pressure of the gas and the supercharging efficiency of the gas are high, and switching between gas supercharging jet and gas non-supercharging jet can be quickly realized. When electromagnetic valve coils and piezoelectric elements are sequentially energized, supercharged gas is jetted, and when the electromagnetic valve coils are not energized but the piezoelectric elements are energized, non-supercharged gas is jetted; dual piezoelectric elements control the jetting of two-path gas through dual needle valves, so that the control accuracy is high, and the jetting stability and the jetting flexibility of the gas are high; when the single piezoelectric element is energized, low-power output can be realized; when the dual piezoelectric elements are energized at the same time, high-power output can be realized; when the single piezoelectric element is energized firstly and then the dual piezoelectric elements are energized, the sequential regular gas jetting can be realized. The avoidance of gas leakage through needle valve matching parts is facilitated, and the power performance and the fuel economy of an engine are improved.

Description

technical field [0001] The invention relates to a gas injection device for a dual-fuel engine, in particular to a combined double-pressurization and double-pressure electric gas injection device. 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. [0003] The existing in-cylinder direct-injection gas injection devices mostly use high-pressure pumps to compress the gas to a specified pressure, and control the movement of the needle valve through a solenoid valve to realize gas injection. The supercharged gas pressure of the injection device fluctuates greatly; the single-cylinder power coverage of the engine is large and the gas injection law control requirements are high. Th...

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Problems solved by technology

[0003] The existing in-cylinder direct-injection gas injection devices mostly use high-pressure pumps to compress the gas to a specified pressure, and control the movement of the needle valve through a solenoid valve to realize gas injection. The supercharged gas pressure of the injection device fluctuates greatly; the single-cylinder power coverage of the engine is large and the gas injection law control requirements are high. The single-nozzle gas injection device is used to match the limited engine power, which cannot meet the engine gas injection law control requirements and different working conditions at the same time. The lower power and serialized engine power requirements; although the two gas injection devices can meet the gas injection requirements of the engine, the size and installation position are limited by the cylinder head; the gas injection device uses pressure gas to lift the valve core, but due to the compression of the gas Strong resistance, which is not conducive to the precise control of the movement of the valve core, and the gas injection is unstable; in addition, with the movement of the valve core, the leakage of gas to the solenoid valve end through the gap between the valve core and the valve body intensifies, resulting in gas injection pressure and injection pressure. Reduced speed, affecting engine power and fuel economy

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