A High Thermal Stability Ion Thruster Screen Barrel

Abstract

The invention discloses a grid cylinder of an ion thruster, which overcomes the deficiency of thermal stability of the existing grid cylinder and can meet the requirements of structural stability and thermal deformation resistance of a high-power ion thruster in a high-temperature environment. The screen cylinder body adopts a cylindrical thin-walled structure, and outwardly protruding reinforcing ribs with the same wall thickness as the cylinder are processed on the circumference of the screen cylinder body, and the reinforcement ribs are integrated with the screen grid cylinder body. Both ends of the screen cylinder body are bent inwardly to form annular inner folds; the screen cylinder body connects the upper fixed structure and the lower fixed structure through the annular inner folds at both ends. Positioning structures are designed at the contact surface between the screen cylinder and the upper fixed structure and at the contact surface between the screen cylinder and the lower fixed structure; the positioning structure includes a positioning boss and a positioning groove that cooperate with each other; the positioning groove Located at the two ends of the screen cylinder, the positioning bosses are located at the upper and lower fixing structures, and a limiting ring-shaped boss is designed on the upper and lower fixing structures.

Description

technical field [0001] The invention belongs to the field of plasma propulsion technology and thermal control technology, and in particular relates to a high-thermal-stable ion thruster screen grid cylinder. Background technique [0002] The ion thruster uses plasma as the energy transfer medium, and the area where the plasma is generated is inside the screen cylinder. The screen cylinder has two main functions for a thruster, one is to provide a space for plasma generation, Isolate the external environment, and the second is to provide the high voltage of thousands of volts required by the discharge chamber, coupled with the working characteristics of the thruster, the screen cylinder must work for a long time in a high voltage, high and low temperature alternating, and high sputtering plasma environment middle. [0003] With the increasing power of the thruster, the original traditional cylindrical thin-walled screen grid tube can no longer meet the thermal stability requ...

AI Technical Summary

Problems solved by technology

[0003] As the power of the thruster increases, the original traditional cylindrical thin-walled screen grid can no longer meet the thermal stability requirements at high temperatures. The traditional screen grid is a simple cylindrical cylindrical structure made of duralumin. At a high temperature of 400°C, the screen cylinder expands severely, and the mounting ring must be made of a magnetically conductive material. The inconsistency of the linear expansion coefficients of the two materials exacerbates the uncontrollable deformation of the screen cylinder. In most cases, the screen The expanded size of the grid cylinder can only be distorted inward, resulting in a decrease in the distance between the screen cylinder and the anode cylinder. This tendency to become smaller will gradually deteriorate in the heat-alternating environment where the thruster is turned on and off repeatedly, and will eventually cause the screen cylinder to , the anode barrel is short-circuited, making the thruster invalid

The deformation of the screen cylinder also causes changes in the shape of the discharge chamber, which in turn changes the plasma density distribution, making the performance of the thruster deviate from the design operating point. The deformation of the screen cylinder will also have adverse effects on the stability of the discharge chamber and the flatness of the beam. influences

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