Reinforced flow guide type large-flow injection device of gaseous fuel engine

Abstract

The invention aims to provide a reinforced flow guide type large-flow injection device of a gaseous fuel engine. The device comprises an air cylinder cover, an air cylinder wall, a piston, an air inlet channel, a fuel gas injection valve and a fuel gas nozzle, wherein the air cylinder cover is located above the air cylinder wall, the piston is located in the air cylinder wall, the air inlet channel is formed on the air cylinder cover, the fuel gas nozzle is located in the air inlet channel and in front of the air inlet valve, the fuel gas injection valve is located outside the air inlet channel, the fuel gas nozzle is connected with the fuel gas injection valve through a fuel gas flow guide pipe, spraying holes are formed at a tail end of the fuel gas nozzle in the circumferential direction, the spraying holes distributed in the same circumference of the tail end of the fuel gas nozzle are a set of spraying holes, each set of spraying holes are evenly distributed in the circumferentialdirection, and the diameter-depth ratio of the spray holes is reduced by thickening a tail end part of the fuel gas nozzle. The device is advantaged in that the fuel gas flow guide effect of a multi-hole spraying nozzle can be enhanced, and the requirements for different working conditions and different emission properties of an engine can be met through different spraying hole arrangement schemes.

Description

technical field [0001] The invention relates to a fuel injection device, in particular to a gas fuel engine injection device. Background technique [0002] With the increasingly severe energy crisis and environmental pollution, domestic and foreign engine manufacturers are actively researching and exploring various energy-saving and emission-reducing technologies. Natural gas has become the most promising alternative energy source due to its advantages such as wide sources, high calorific value and less pollution. Among them, the lean combustion technology can reduce the intake throttling loss, can adopt a higher compression ratio, and the combustion temperature is lower, so that the engine produces higher thermal efficiency and lower NOx emissions, and has become an important technology for energy saving and emission reduction of the engine. measure. For natural gas engines with perforated sidewall gas nozzles with porous structures, if the nozzle is not thickened for lar...

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Problems solved by technology

The purpose of this structure is to change the injection hole of the injection duct from one injection hole to multiple side hole injection, which can more effectively improve the uniformity of gas mixing, thereby improving the engine performance, but this device is only suitable for natural gas with small flow and small aperture Engine, when the engine needs to inject a large amount of natural gas, the intake efficiency of natural gas will be hindered because the hole diameter is too small. If the size of the injection hole is changed to improve this situation, the ratio of the depth of the injection hole to the diameter of the injection hole will be too small. Better gas diversion effect, thus affecting the quality of natural gas and air mixing, and then affecting the quality of natural gas combustion in the cylinder

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