Concave groove spark plug

Abstract

The invention relates to a concave groove spark plug which is characterized in that a lateral electrode is welded on a shell, a central electrode is arranged in the center of a porcelain core, and the upper end of the porcelain core exposes out of a porcelain surface, and concave grooves are respectively arranged at the discharging end of the central electrode and the discharging end of the lateral electrode. As the technical scheme is adopted, particularly, the central electrode and the lateral electrode are both provided with the concave grooves, and planar discharging is changed into angular-tip and perforated-type discharging, the concave groove spark plug improves the arc breakdown capability, reduces covering and flame-suppressing roles of the lateral electrode, promotes the instant expansion of flame, decreases the ignition voltage and the load of an ignition system, accelerates the combustion speed of mixture gas and prolongs the service life of related components; and as spark generated between the electrodes is approximately and directly exposed in the mixture gas, the ignition energy loss is reduced, and the combustion efficiency of the mixture gas is improved; therefore, the invention ensures that an engine is easier to start and the mixture gas is more sufficient to combust, saves fuels, reduces the operating cost, reduces the pollution and improves the engine power.

Description

technical field [0001] The invention belongs to a spark plug for igniting an internal combustion engine using gasoline (including gasoline with a certain proportion of ethanol or methanol added), gas and all alcohols as fuel, in particular to a concave groove spark plug. technical background [0002] At present, most of the traditional spark plugs in use at home and abroad are spark plugs with a single center electrode and a single side electrode structure. The discharge end of the side electrode bend of this kind of spark plug is covered on the top of the center electrode, thereby covering the electric spark, and the center electrode and the side electrode are basically geometrically opposite, so it is easy to produce the following disadvantages: one is not It is conducive to the maximum effective contact between the electric spark and the combustible mixture. This kind of shielded electrode structure can instantly expand the instantaneous flame nucleus generated by the el...

AI Technical Summary

Problems solved by technology

The discharge end of the side electrode bend of this kind of spark plug is covered on the upper part of the center electrode, thereby covering the electric spark, and the center electrode and the side electrode are basically all geometrically opposite, therefore, it is easy to produce the following disadvantages: one is not Conducive to the maximum effective contact between the spark and the combustible mixture

This kind of shielded electrode structure can instantly expand the instantaneous flame nucleus generated by the electric spark between the spark plug electrodes, forming a cover and flame suppression effect, weakening the ignition energy of the electric spark, resulting in insufficient instantaneous combustion of the mixture, thereby reducing the engine Power, increase fuel consumption and exhaust gas generation; second, it is not conducive to engine cold machine or start at low temperature

When the engine is started at cold or low temperature, due to the low temperature, it is easy to produce condensed fuel droplets in the center electrode, side electrode or the area between the two electrodes, especially the need for atomization If the liquid fuel is used, the phenomenon is more obvious, resulting in ignition failure, resulting in difficulty in starting the engine and unnecessary loss of related components

Third, it is not conducive to the full formation and utilization of the electric field strength, resulting in a relatively high breakdown voltage

Since the discharge parts of the central electrode and the side electrodes are geometrically shaped, the arc needs to break through the high-density gas mixture. If an ionization channel capable of discharge is to be formed, a relatively high ignition voltage must be required, especially as the two electrodes are separated. Corrosion, when the gap between the electrodes is constantly increasing, the ignition voltage that needs to break down the mixture gas will be higher, which will increase the workload of each component of the ignition system invisibly, and in severe cases will cause high-voltage coils, high-voltage lines and other components Reduced service life

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