A high temperature resistant spark plug

Abstract

The invention discloses a high temperature resistant spark plug, which comprises a spark plug shell, an insulator and a central electrode; a negative ignition unit is arranged above the central electrode, and the negative ignition unit includes a shell and a negative electrode; the lower end of the shell is embedded in the The spark plug is fixed inside the shell, and the cavity in the shell and the hollow cavity in the spark plug shell form an expansion chamber; it is characterized in that: a central exhaust hole is provided at the center of the bottom surface of the negative ignition unit, and the outside of the shell A longitudinal arc-shaped groove is provided on the wall, and the arc-shaped groove extends from the lower end of the housing to the upper end not covered by the spark plug shell; the housing is provided with a horizontally arranged negative electrode, and the negative electrode terminal The distance between the head and the top of the central electrode is the firing distance. The high-temperature-resistant spark plug of the present invention does not have heat accumulation at the top of the negative electrode ignition unit, which ensures that the negative electrode will not be damaged by overheating, and at the same time effectively prevents the accumulation of exhaust gas in the hollow cavity.

Description

technical field [0001] The invention relates to the field of spark plugs for automobiles, in particular to a high temperature resistant spark plug. Background technique [0002] see figure 1 As shown, the Chinese patent No. 201621291326.5 "a kind of spark plug" discloses a spark plug, including a spark plug shell 10, an insulator 11 and a central electrode 12; the spark plug shell is provided with a hollow cavity 13, and the insulator 11 is fixed in the hollow cavity 13, the central electrode 12 is covered in the insulator 11, and the top of the central electrode 12 extends through the insulator 11 and is exposed in the hollow cavity 13 of the spark plug shell 10; Unit 20, the negative electrode ignition unit 20 includes a housing 21 and a negative electrode 22; the lower end of the housing 21 is fixedly connected to the upper end of the spark plug housing 10, such as welding, screwing, etc.; the cavity in the housing 21 and The hollow cavity 13 in the spark plug housing 1...

AI Technical Summary

Problems solved by technology

However, after the hollow cavity 13 is ignited, the center of the top of the negative ignition unit is the area where the heat is most concentrated. After multiple ignitions, the electrodes of the negative ignition unit are always in a high-temperature environment, resulting in a greatly increased damage rate.

[0005] 2) The housing side wall of the above-mentioned spark plug is provided with a plurality of exhaust gas outlets 24, but the accumulation of exhaust gas is mainly at the bottom of the hollow cavity 13. After fresh air enters from the top of the housing of the negative ignition unit 20 and ignites, The exhaust gas outlet 24 located on the upper part of the side wall of the housing cannot effectively help the exhaust gas to be discharged

As a result, the exhaust gas at the bottom of the hollow cavity 13 accumulates more and more, which hinders the effective ignition of the spark plug

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