流量自调式真空发生器的分隔式气-磁驱动技术研究

Research on the Chamber-separating Pneumatic-magnetic Driving Technology for the Flow Self-regulated Vacuum Ejector

针对目前使用的射流式真空发生器存在的持续定量供气空气消耗量大的问题,提出了一种新的流量自调式射流真空发生器的总体技术方案。研究了该技术方案中的分隔式气-磁驱动关键技术,提出了真空检测-压差致动和共轴环芯结构非接触式气-磁驱动技术方案。研究了气-磁驱动系统的动态特性并进行了试验。结果表明:共轴环芯气-磁驱动系统的磁驱动起动时间约为0.06 s。同时,对共轴环芯结构主要设计参数间的匹配关系进行了试验研究。通过对流量自调式真空发生器的整机测试表明,采用共轴环芯气-磁驱动结构的流量自调式真空发生器在真空产生阶段具有与固定式真空发生器相同的真空响应特性,在真空维持阶段比固定式真空发生器节省供气流量约14.8%。

Aimed at the problem of a lot of pressurized air consumption under continuous and constant air supply with currently used vacuum ejector, a novel technical structure of a flow self-regulated vacuum ejector was presented. The key technology for the new structure called chamber-separating pneumatic-magnetic driving was studied, in which a vacuum detecting-differential pressure actuating and non-contacting pneumatic-magnetic driving with a coaxial magnetic ring- axial structure were designed. The dynamic characteristic of the driving system, was researched and experiment was conducted. The experiment result shows that the starting time of the magnetic driving component is about 0. 06s. The relationship of main design parameters was studied through experiment. Experimental resuits for the flow self-regulated vacuum ejector show that this new ejector has the same vacuum response speed and could save air consumption about 14. 8% compared with constant- area ejector.