a spark plug

Abstract

The invention relates to a spark plug. The spark plug includes an insulator, a center electrode, a shell, a flow guide plug-in and grounding electrodes; a shaft hole extending along an axial is formed in the insulator; the center electrode is inserted into and penetrates the shaft hole of the insulator, an end portion of the center electrode protruding out from the insulator; the shell is hollow column-shaped and sleeves the surface of the insulator; the flow guide plug-in is fixed in the shell; the front end of the flow guide plug-in is aligned with the center electrode; the rear end of the flow guide plug-in is located at the opening end of the shell; a fire spraying hole which penetrates the front end surface and rear end surface of the flow guide plug-in is formed at the center of the flow guide plug-in; the aperture of the front end of the fire spraying hole is larger than that of the rear end of the fire spraying hole; an annular flow guide channel is formed between the flow guide plug-in and the shell; the grounding electrodes are arranged at the front end portion of the fire spraying hole, so that an ignition portion with spark discharge gaps can be formed between the grounding electrodes and the end portion of the center electrode. According to the spark plug of the invention, deposits will not appear in the center electrode, and the center electrode will not be corroded; and with the flow guide plug-in adopted, the ignition efficiency and backflow efficiency of the spark plug can be improved, and therefore, the combustion efficiency of an internal combustion engine can be improved.

Description

technical field [0001] The invention relates to the ignition field of an internal combustion engine, in particular to a spark plug. Background technique [0002] The internal combustion engine is a heat engine that converts heat energy into mechanical energy by mixing liquid or gaseous fuel with air and directly inputting it into the high-pressure combustion chamber inside the cylinder for combustion and explosion to generate power. The spark plug is installed on the internal combustion engine and is used to ignite the mixed gas in the combustion chamber. [0003] see figure 1 , which is a schematic structural diagram of the spark plug 10 in the prior art. The spark plug 10 includes a center electrode 11 , an insulator 12 , a casing 13 and a ground electrode 14 . The insulator 12 is a ceramic insulator with an axis hole extending along the axis, and the center electrode 11 is inserted through the axis hole of the insulator 12 . The casing 13 is disposed on the outer peri...

AI Technical Summary

Problems solved by technology

However, setting the center electrode and the ground electrode in the cavity of the housing will increase the distance for the sparks generated by the two electrodes to enter the combustion chamber, thereby delaying the ignition time of the mixed gas in the combustion chamber. If the time of the stroke and the expansion stroke is fixed, the combustion time of the mixed gas will be shortened, which will reduce the combustion efficiency of the internal combustion engine to a certain extent, which is not conducive to energy saving and environmental protection.

And the ignition gap 25 between the ground electrode 23 and the discharge end 211 of the central electrode is extremely important, and must be within a certain distance to facilitate its discharge, but the ignition gap 25 is too small to be unfavorable for the mixed gas to enter the air intake stroke. The discharge gap also reduces the ignition efficiency of the spark plug to a certain extent

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