中继阀性能检测系统设计

Design of performance testing system for relay valve

目前中继阀的检测主要依靠整体制动机试验台,且检测步骤繁琐,测试精度、效率无法保障。针对中继阀由总风遮断阀、管座、双阀口式中继阀3部分组成的结构,采用自动控制与数字信号处理技术,设计一套中继阀性能检测系统。基于PCI数据采集控制卡,设计计算机数据采集控制系统,开发Lab VIEW中继阀数据采集控制软件,搭建中继阀实验平台。模拟中继阀在缓解充气、缓解保压、制动、制动保压、过充5种状态下,实现对总风遮断阀动态响应、列车管阶段增压减压、活塞灵敏度、供气阀供气、排气阀排气、过充等6项测试,并采用差压法对其密封性进行测试。测试得到总风遮断阀平均动态响应时间为0.206 s,活塞灵敏度平衡性能最大压力不确定度为0.849 k Pa,供气阀供气性能最大压力不确定度为0.864 k Pa,排气阀排气性能最大压力不确定度为0.854 k Pa,过充最大压力不确定度为0.851 k Pa。实验结果表明:系统性能稳定,满足中继阀各性能测试要求。

Currently, the performance testing of relay valve mainly relies on whole brake test bench and the testing steps are complicated and the precision and efficiency cannot be guaranteed.As the relay valve is composed of three parts, i.e. main air shutoff valve, pipe base and doubleported relay valve, the technology of automatic control and digital signal processing is used to design a set of performance testing system for relay valve. Based on PCI data acquisition and control card, a computer data acquisition and control system is designed, Lab VIEW relay valve data acquisition and control software is developed, and a relay valve test bench is established.Under the five conditions of relieved inflation, relieved pressure maintaining, brake, service lap and over-inflation, the dynamic response of main air shutoff valve, staged pressure increase and decrease of train pipe, piston sensitivity, air supply of air supply valve, air exhaust of air exhaust valve and over-inflation are tested and differential pressure method is used to test its sealing performance. The testing results show that the average dynamic response time of the main air shutoff valve is 0.206 s, the maximum pressure uncertainty of piston sensitivity performance is0.849 k Pa, the maximum pressure uncertainty of air supply valve performance is 0.864 k Pa, the maximum pressure uncertainty of air exhaust valve performance is 0.854 k Pa, and the maximum pressure uncertainty of over-inflation performance is 0.851 k Pa. The testing results show that the system has stable performance and meets the performance testing requirements of relay valve.