Method for enhancing internal sealing performance of spark plug and spark plug

• Main Authors: DENG JUN, LI FANG, LI YAO, YANG HUIMU
• Format: Patent
• Language: Chinese; English
• Published: 05.04.2022
• Subjects: BASIC ELECTRIC ELEMENTS; CORONA DEVICES; ELECTRICITY; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARK GAPS; SPARKING PLUGS

According to the method, by increasing the thickness-to-height ratio of an expansion groove after plastic deformation, the expansion groove has larger pre-pressing elasticity in the axial direction, so that the influence of contraction force reduction caused by thermal expansion is reduced, the pre-tightening force between an insulator and a shell is guaranteed, and the sealing performance of the interior of the spark plug is improved. The sealing performance in the spark plug is enhanced. And meanwhile, the elastic ring is arranged between the edge covering opening of the shell and the insulator flange, so that the elastic ring generates elastic deformation, and the pre-tightening force between the insulator and the shell is further improved by utilizing the resilience force generated after the elastic ring is compressed, so that the influence of shrinkage force reduction caused by thermal expansion is further reduced. Then the pre-pressing elasticity of the elastic ring and the inner gasket is increased by