Piston for natural gas engine

Abstract

Provided is a piston for a natural gas engine. The technical scheme is that the piston for the natural gas engine comprises a piston body, wherein the upper portion of the piston body is provided with a combusting chamber, an axial section of the combusting chamber is 'Omega'-shaped with closed-up flat arc bottoms. The piston for the natural gas engine has the advantages that the combusting chamber with the 'Omega'-shaped axial section can improve the mixed gas motion linear speed, powerful turbulent flow and eddy flow motions are formed, mixed gas can be rapidly and effectively combusted, accordingly the explosion pressure is reduced, and CH discharge is reduced.

Description

[0001] The invention relates to a piston for a natural gas engine. Background technique [0002] figure 1 The piston and combustion chamber for a natural gas engine shown are used in a 420-horsepower engine. When the power performance index is met, the margin for misfire limit and knock limit is very small, and there is no room for adjustment, so it is difficult to upgrade to the national standard. IV and higher emission levels. Analyzing the piston used in the original engine, it was found that the top clearance of the piston was too large, resulting in a large area of ​​"dead zone" in the combustion chamber, the mixture could not be completely combusted, resulting in high CH emissions; the shape of the combustion chamber could not be well combined with the shape of the flame propagation , causing the combustion to be unstable and soft, and the explosion pressure to rise. Contents of the invention [0003] The invention aims at the deficiencies of the prior art. In order ...

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Problems solved by technology

[0002] figure 1 The piston and combustion chamber for a natural gas engine shown are used in a 420-horsepower engine. Under the condition of meeting the power performance index, the margin for misfire limit and knock limit is very small, and there is no room for adjustment, so it is difficult to upgrade to the national standard. IV and higher emission levels

Analysis of the piston used in the original engine found that the top clearance of the piston is too large, resulting in a large area of ​​"dead zone" in the combustion chamber, the mixture cannot be completely combusted, resulting in high CH emissions; the shape of the combustion chamber cannot be well combined with the shape of the flame propagation , causing the combustion to be unstable and soft, and the explosion pressure to rise

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