插装式液控能源选择阀的设计与分析

针对液压系统油源的安全性及可靠性问题，提出油源冗余设计方法，即多油源供给多负载，当某一油源发生故障时能源选择阀切断故障油源，由其他油源给负载提供基本液压能源，系统能完成必须的服役性能。针对液压系统能源选择阀存在的频繁换向与振动问题，提出一种插装式液控能源选择阀，其先导阀采用锥阀和可变阻尼形式，主阀采用三台肩且终端有缓冲功能的滑阀。建立了插装式液控能源选择阀的数学模型，分析了能源选择阀在两种模拟故障下的切换压力及切换时间、油源压力脉动等特性。理论分析结果表明，油源压力阶跃和线性变化时，某能源选择阀切换时间分别为5 ms和7 ms。当压力发生波动时，主阀不会发生振动，还可通过液控先导阀结构设计来控制切换压力和回复压力大小。

Design and Analysis of Cartridge Hydraulic Control Energy Selection Valve

Aiming at the safety and reliability of the oil source in the hydraulic system, an oil source redundancy design method is proposed. In the case of multiple oil sources supplying multiple loads, the energy selection valve cuts off the failed oil source when it fails, and other oil sources provide basic hydraulic energy to the load, so that the system can complete the necessary service performance. To help address the problems of the frequent reversing and vibration of the hydraulic system energy selection valve, a cartridge hydraulic control energy selection valve is proposed. The pilot valve adopts a poppet valve and a variable damping structure, and the main valve adopts a sliding valve structure with three shoulders and a buffer function at the end. The mathematical model of the cartridge hydraulically controlled energy selection valve is built which analyses the switching pressure, switching time, and oil source pressure pulsation of the energy selection valve under two types of simulated malfunction. Theoretical analysis results show that the switching time of a certain energy selection valve is 5 ms and 7 ms respectively when there is a step and linear change in the oil source pressure. When the pressure fluctuates, the main valve will not vibrate, and the switching pressure and return pressure can also be controlled through the structural design of the hydraulic pilot valve.