机载惰化系统流量调节阀结构改进研究

Research on structure improvement of flow regulating valve for onboard inerting system

机载惰化系统流量调节阀的气体流通能力会对飞机运行的安全性产生影响,为满足飞机油箱防火防爆的性能要求,解决机载惰化系统流量调节阀流量大小受入口压力及温度影响较大和通电后活门复位问题,从三方面实现了流量调节阀结构改进。采用纯套筒式活塞结构,减小入口压力对流量大小的影响;取消橡胶密封圈并增加配合精度及使用润滑脂,减小温度对流量大小的影响;改进装置内气体流通通道,增强气体流通能力使得活门复位后可关紧。计算相关参数后,进行了系列实验验证。结果表明:入口压力及温度对流量大小的影响得到显著改善,气体流通能力稳定,复位后活门不再发生泄漏,气密性良好,符合飞机油箱的防火防爆要求,拥有更好的安全性。

The gas flow capacity of flow regulating valve for onboard inerting system can cause effects on the safety of aircraft operation.In order to meet the performance requirements of fire and explosion prevention of aircraft fuel tank in flight and solve the problems of flow regulating valve for onboard inerting system that inlet pressure and temperature have important effects to flow rate and valve cannot reset normally,three aspects were analyzed to realize the structure improvement of flow regulating valve for onboard inerting system.Sleeve plunger structure was used to reduce the effects of inlet pressure on flow rate.Rubber sealing was canceled and fitting accuracy was increased and grease was used to reduce the effects of temperature on flow rate.Gas flow channel was improved to enhance the gas flow capacity to fasten the valve after resetting.Correlation parameters were calculated,finally a series of validating experiments were carried out.The results showed that:the effect of inlet pressure and temperature on flow rate were improved,the gas flow capacity was stable.The leak condition of flow regulating valve after resetting was improved,the air tightness was good.Optimized flow regulating valve met the fire and explosion proof requirements of aircraft fuel tank and has better safety.