Performance degradation model of roots pump in vacuum system based on leakage of rotor wear

As an important component of the vacuum system, the performance of Roots Pump affects the reliability of the system. This paper selects the rotor wear fault mode as the research object, based on the establishment of Roots Pump's basic model, through the analysis on the failure mechanism, models the leakage, and finally establishes the Roots Pump's performance degradation model of leakage caused by rotor wear. Combined with the actual conditions, by using MATLAB and ANSYS to do the verified simulation, this paper tests the validity, accuracy and precision of the model, gets the degradation curve of Roots Pump's performance and predicts the start time and the failure time of the Roots Pump's performance degradation. This paper provides the theoretical basis for the maintenance and repair of the Roots Pump in the vacuum system.

I. Introduction

Vacuum system is an important part of the space environment simulator (SES). Its function is to make the vacuum chamber simulate the vacuum environment of space^[1]. The reliability of the vacuum system is an important factor to determine whether the SES can work effectively. The vacuum system consists of roughing vacuum system, high vacuum system, vacuum measurement system, molecular pump system and repressurization system. All the subsystems are connected to the vacuum chamber. Through failure modes and effects analysis (FMEA) on the vacuum system, it is determined that the key component in determining the performance of the vacuum system is the Roots Pump in roughing vacuum system.