A riveted ion thruster grid component and its manufacturing method

Abstract

A riveted ion thruster grid electrode part comprises a grid piece and a grid electrode mounting ring, wherein first fixing holes are formed in the periphery of the grid piece, second fixing holes are formed in the periphery of the grid electrode mounting ring, the grid piece and the grid electrode mounting ring are riveted and fixed by using titanium rivets, and the titanium rivets penetrate through the first fixing holes in the grid piece and are riveted with the second fixing holes in the grid electrode mounting ring at the other side. According to the riveted ion thruster grid electrode part, the fixing manner of the grid piece and the grid electrode mounting ring of the grid electrode part is changed to a riveting structure from a conventional nut connecting structure, and the technical problems caused by the conventional nut connecting technique, which is used by people for a long time, are solved. By adopting a titanium rivet riveting and fastening manner to fix the grid piece and the grid electrode mounting ring, the structure of a grid electrode assembly is simplified, the number of standard components is reduced, the reliability of a grid electrode is effectively improved, no looseness occurs, the mechanics resistance is good, the centering performance of the assembly of the grid electrode is improved, intercepted current is reduced, and the service life of the ion thruster is prolonged.

Description

technical field [0001] The invention belongs to the field of aerospace electric propulsion technology and vacuum electronics technology, and specifically relates to a grid part of an ion thruster riveted with titanium rivets. grid assembly. Background technique [0002] The function of the ion thruster grid assembly is to focus, accelerate and orientate the ionized xenon ions in the discharge chamber. It is a key component of the ion thruster. composition) overlay composition. The performance of the grid assembly is directly related to the performance and life of the thruster, and even affects the success or failure of the space mission. [0003] The commonly used method of fixing the grid and the grid installation ring is screw connection. There are threaded holes or through holes with a diameter larger than the major diameter of the screw used on the grid installation ring (one side is fastened with a nut). There are also through holes with a diameter larger than the ma...

AI Technical Summary

Problems solved by technology

[0003] The commonly used method of fixing the grid and the grid installation ring is screw connection. There are threaded holes or through holes with a diameter larger than the major diameter of the screw used on the grid installation ring (one side is fastened with a nut). There are also through holes with a diameter larger than the major diameter of the screw used, which causes the problem of poor alignment between the grid and the grid installation ring during the assembly process, resulting in a high intercepted current and a reduced life of the thruster.

In addition, the screw connection method is prone to loosening when subjected to the harsh mechanical environment during the launch of the spacecraft, which affects the performance of the ion thruster. In severe cases, it will fall off, causing the thruster to fail and affect the reliability of the entire star.

Images