High-temperature-resistant spark plug for lean gas

Abstract

The invention discloses a high-temperature-resistant spark plug for lean gas. The high-temperature-resistant spark plug comprises a spark plug shell, an insulator and a central electrode, wherein a negative electrode ignition unit is arranged above the central electrode and comprises a shell and a negative electrode; the lower end of the shell is embedded into the spark plug shell to be fixed, anda cavity in the shell and a hollow cavity in the spark plug shell form an expansion cavity; a central exhaust hole is formed in the center of the bottom surface of a shell of the negative electrode ignition unit, a longitudinal arc-shaped groove is formed in the outer side wall of the shell, and the arc-shaped groove extends from the lower end of the shell to the upper end, which is not wrapped by the spark plug shell, of the shell; a horizontally-arranged negative electrode is arranged on the shell, and an ignition distance is reserved between the end of the negative electrode and the top end of the central electrode. According to the high-temperature-resistant spark plug, the heat accumulation phenomenon does not occur at the top end of the negative electrode ignition unit any more, itis guaranteed that the negative electrode is not damaged due to overheating, and waste gas is effectively prevented from accumulating in the hollow cavity; and the thin gas in the cylinder can be stably ignited.

Description

technical field [0001] The invention relates to the field of spark plugs for automobiles, in particular to a high-temperature-resistant spark plug for rare gas. 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 p...

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 provided on the upper part of the side wall of the housing cannot effectively help the discharge of exhaust gas; resulting in the accumulation of exhaust gas at the bottom of the hollow cavity 13, which hinders the effective ignition of the spark plug

[0006] 3) When the gas in the cylinder is a rare gas, the existing spark plug cannot be ignited stably

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