Research on precision manufacturing technology of space high-sealing and long-life plunger type constant current output device

Focusing on a plunger type constant current output device designed for high sealing and long-life with complex multi-component coupling composition, high assembly precision, many influencing factors and other manufacturing problems, based on the in-depth analysis of the assembly precision of the plunger type constant current output device and the mechanism of the influencing factors of the operational performance, the surface quality of the structure, the axial runout of the system and the structural dimensional accuracy are accurately controlled by the precision error analysis and the corresponding design; The analysis decouples the rotational precision of the screw to propose a directional assembly method based on the principle of error compensation. Analyzing the leakage rate of sealing sub-factors in the constant-flow device, this study proposes solutions such as analyzing and controlling surface quality, dynamic sealing sub-filtering and matching, as well as regulating sealing sub-factor parameters to achieve shaft system runout accuracy of over 0. 007mm; The system's overall lifespan has been verified through an equivalent simulation test, achieving over 10500 hours of safe and stable operation and performance. This verification was conducted through an equivalent simulation test, resulting in a lifespan increase of 60%. This provides strong assurance for the space transportation system.