Bypass type piezoelectric type inner guide fuel gas injection valve with floating valve seat

Abstract

The invention aims at providing a bypass type piezoelectric type inner guide fuel gas injection valve with a floating valve seat. Through the floating valve seat structure, reverse leakage caused by imbalance of the internal and external pressure of a fuel gas injection valve is avoided, and the working reliable of the fuel gas injection valve is guaranteed. The gas intake and flow guide process is realized through a bypass structure and a flow guide cavity structure. A valve element and a gas circuit are controlled through a piezoelectric actuator to realize the function of gas injection of the fuel gas valve. Through matching of an inner guide structure, pressure balance holes and pressure balance slots, the perpendicularity of the valve element is guaranteed, the work stability and reliable of gas flow are realized, and the response speed is high. The mixed gas intake mode of direct gas intake through an axial main gas slot and gas intake through circumferential gas make-up holes, the large flow is realized, and the gas supply efficiency of an engine is effectively improved; meanwhile, gas flow interference can be avoided, and the stability of the gas circuit is realized; and through multiple ring band structures between the valve element and the valve seat, surface sealing and high stability of the fuel gas injection valve are realized.

Description

technical field [0001] The invention relates to a gas injection valve, in particular to a gas injection valve for a natural gas engine. Background technique [0002] In recent years, with the rapid growth of my country's oil consumption, oil is heavily dependent on imports. Natural gas burns cleanly and has abundant reserves in my country, making it the most likely fuel to replace diesel. Natural gas engines have good application prospects as ship power, especially as propulsion power for inland watercraft. As a fuel supply device for a natural gas engine, the performance of the gas injection valve directly determines the economy and emission performance of the natural gas engine. At present, natural gas engines often have insufficient gas supply when working under full working conditions, resulting in unstable speed when the engine is running under full working conditions, which will be more serious on high-power engines, which seriously affects the normal use of the engi...

AI Technical Summary

Problems solved by technology

At present, natural gas engines often have insufficient gas supply when working under full working conditions, resulting in unstable speed when the engine is running under full working conditions, which will be more serious on high-power engines, which seriously affects the normal use of the engine and engine performance

In the case of severe engine operating conditions, the injection valve is prone to reverse leakage

Images