深空探测航天器推进系统永磁自锁式电磁阀设计及仿真

Scheme Design and Simulation Analysis of Permanent Magnetic Self-locking Solenoid Valve in Deep Space Exploration Spacecraft Propulsion System

给出了一种应用于地月运输航天器的先导式高压、大流量永磁自锁式电磁阀(以下简称“自锁阀”)设计方案,对该自锁阀的电磁铁磁路设计进行了理论推导。对磁路中导磁材料铁钴钒软磁合金开展了不同热处理状态下的材料级试验,结果表明,两轮次880℃热处理条件可使材料获得较好的磁性能,其饱和磁感应强度达2.25 T以上,矫顽力低于150 A/m。根据使用工况对永磁体材料及O胶圈材料进行了选型和分析。采用有限元方法进行了磁回路静态及动态仿真,结果表明,-55~70℃工况下,永磁体对衔铁产生的静磁吸力在167~208 N之间,通电24 V条件下衔铁在70 ms内可完成全程动作。采用零维模型搭建主阀部分流通性能仿真系统,结果表明,来流压强为35 MPa氦气时,氦气流量0~350 g/s条件下,自锁阀主阀流阻低于0.35 MPa。

A scheme design for a pilot operated high-pressure and large flow permanent magnet self-locking solenoid valve(hereinafter referred to as the"self-locking solenoid valve")applied to earth-moon transportation spacecraft is proposed,and the magnetic circuit design of the self-locking solenoid valve is theoretically derived.The effect of different heat treatment conditions on the magnetic properties of Fe-Co-V soft magnetic alloy is experimentally studied.The results show that the material can obtain better magnetic properties after two rounds of 880℃heat treatment.The saturation magnetic flux density is more than 2.25T,and the coercive force is less than 150A/m.The selection and analysis of permanent magnet materials and O-ring materials are conducted based on the working conditions.The static and dynamic simulations of the magnetic circuit is conducted using finite element method.The results show that under the working conditions of-55℃~70℃,the static magnetic attraction generated by the permanent magnet on the armature is between 167N and 208N.Under the condition of 24V power on,the armature completes the entire movement within 70ms.A zero dimensional model is used to build a flow capacity simulation system for the main valve part.The results show that when the inlet pressure is 35MPa helium gas and the flow rate is 0~350g/s,the flow resistance of the self-locking solenoid valve main valve was lower than 0.35MPa.