航天飞行器用高温密封的工作环境苛刻，为保障飞行安全需进行密封件性能测试，然而现有的测试设备和方法无法达到理想的高温高压且可变的模拟工作环境。以W形金属密封圈气密性测试为例，设计密封件试验器并搭建高温热密封试验平台；对试验器模型进行瞬态热分析，得到试验器温度场分布和结构总变形；完成W形金属密封圈从室温至740 ℃的多种温度、0~1.2 MPa内外压差工况下的连续、自动化的泄漏率测试。结果表明：试件在试验器内受热均匀，可达到要求的最高温度740 ℃，试验器可承受1.1 MPa内压，在高温工况下无塑性变形；提出的测试技术可有效判定不同W形金属密封圈的密封性能优劣，可实现W形密封件在多种压差、温度工况的气密性测试。
The working environment for high-temperature seals used in aerospace vehicles is harsh,and performance testing of seals is necessary to ensure flight safety.However,the existing testing equipment and methods cannot achieve the ideal high-temperature,high-pressure,and variable simulation working environment.Taking the airtightness testing of W-shaped metal sealing rings as an example,a seal tester was designed and a high-temperature thermal sealing test platform was build.Transient thermal analysis was carried out on the tester model to obtain the temperature field distribution and total structural deformation of the tester.The continuous and automated leakage rate testing of W-shaped metal sealing rings was carried out at various temperatures from room temperature to 740 ℃,with the internal and external pressure difference from 0 to 1.2 MPa.The results show that the test piece is uniformly heated in the tester and can reach the required maximum temperature of 740 ℃.The tester can withstand an internal pressure of 1.1 MPa and has no plastic deformation under high temperature conditions.The proposed testing technology can effectively evaluate the sealing performance of different W-shaped metal sealing rings,and can achieve airtightness testing of W-shaped seals under various pressure and temperature conditions.
CHEN Lifang, ZHOU Yuhang, GUO Yixiang. Research on High Temperature Sealing Test Technology for Spacecraft[J]. Lubrication Engineering,2023,48(10):74-79.