Ignition nozzle of a high-thrust engine

Abstract

The application provides an ignition nozzle for a large-thrust engine, in which a ring plate is arranged on the outer ring surface of the middle part of the center electrode (4), and the upper insulator covering the center electrode is a hollow cylinder structure processed by high-alumina porcelain. The inner wall is provided with a stepped surface, and the inner wall of the upper insulator is electroplated with metallic nickel at the stepped surface, for when the central electrode (4) is installed in the insulator (7), the upper insulator (7) is electroplated with metallic nickel The part is welded with the ring plate of the center electrode (4); a compressed spring (10) is arranged between the stepped surface formed at the outer wall of the upper insulator (7) and the end of the lower insulator. In this application, the technology of metallizing the ceramic surface makes the insulator ceramic and metal form an integrated structure, which not only ensures the sealing performance of the product, but also ensures the strength of the product structure. In addition, high-temperature alloy springs are added inside the product to make the structure elastic and eliminate the impact of ignition and deflagration on the structure.

Description

technical field

[0001] The invention belongs to the technical field of engine ignition electric nozzle processing, and in particular relates to an ignition electric nozzle for a high-thrust engine. Background technique

[0002] The ceramic surface ignition nozzle is a product that uses the insulator ceramic surface as a medium to cause high-voltage electricity to break down the air between the center electrode 4 and the side electrode 1 to generate electric sparks to ignite the oil-gas mixture in the engine combustion chamber.

[0003] Existing technologies such as figure 1 As shown, the lower case 3 and the upper case 8 are first welded together, then the side electrode 1 is pressed into the bottom of the lower case 3, and then the lower insulator 2 is inserted, the center electrode 4 is inserted into the lower insulator 2, and the glass is filled. Material powder 5, after heating the glass material powder to make it melt, compact it with an insulator 7, put the contact ca...

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