Ignition device of natural gas engine

Abstract

The invention discloses an ignition device of a natural gas engine. The ignition device comprises an injection body, an injection head and a sparking plug; the injection body is cylindrical, a sparking plug installation counter bore is formed in the upper end of the injection body, and a gas channel is formed in one side of the sparking plug counter bore; an injection head installation counter bore communicated with the sparking plug installation counter bore and the gas channel is formed in the lower end of the injection body; the injection head is barrel-shaped, the upper end of the injection head is installed in the injection head installation counter bore to form a combustion space, and a flame injection hole is formed in the lower end of the injection head; the sparking plug is installed in the sparking plug installation counter bore, and an electrode at the lower end of the sparking plug stretches into the combustion space. According to the ignition device of the natural gas engine, the step-by-step combustion flame injection technology is adopted, a small quantity of rich gas mixture is ignited through a little ignition energy, a great deal of lean gas mixture is ignited after flames are produced, and therefore the successive combustion mode of the rich gas mixture in the combustion space and the lean gas mixture in a combustion chamber is achieved. The ignition device of the natural gas engine is reasonable and simple in structure, low in ignition energy requirement, and good in durability and ignition stability.

Description

technical field [0001] The invention relates to the field of engines, in particular to an ignition device for a natural gas engine. Background technique [0002] Spark plugs (spark plugs), commonly known as the burner, its function is to discharge the pulsed high-voltage electricity sent by the high-voltage wire (burner wire), break down the air between the two electrodes of the spark plug, and generate an electric spark to ignite the mixture in the cylinder. gas. The basic conditions for a high-performance engine: high-energy and stable spark, a well-mixed mixture, and a high compression ratio. [0003] Traditional natural gas engines usually use an open combustion chamber, and the spark plug needs to extend into the combustion chamber to directly ignite the mixture in the combustion chamber. The disadvantage of this structure is that it is limited by the degree of leanness of the mixture in the combustion chamber. The gas mixture concentration is low, so that the ignitio...

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Problems solved by technology

[0003] Traditional natural gas engines usually use an open combustion chamber, and the spark plug needs to extend into the combustion chamber to directly ignite the mixture in the combustion chamber. The disadvantage of this structure is that it is limited by the degree of leanness of the mixture in the combustion chamber. The gas mixture concentration is low, so that the ignition of the spark plug requires a considerable amount of ignition energy, that is, a higher pulse voltage is required to send a higher pulse voltage from the high-voltage wire (igniter wire) to increase the ignition energy of the spark plug, which in turn affects the durability and ignition stability of the spark plug , which also makes the combustion and flame propagation of the mixture unstable and prone to fire

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