摘要
活塞式压力计量中,微量的压力变化需要依赖微小砝码,无法实现连续压力变化输出,且自动化存在一定困难.鉴于此,提出了一种基于光机电设计的磁平衡法压力计量方法并进行装置研究,以探索电磁平衡法实现压力计量的可行性.在该装置中,原本用于平衡的砝码重力计量用电子天平代替,无需人为手动加减砝码,直接由天平称量平衡力;另一方面,通过磁斥力方式,调节磁铁对的间距以连续输出计量所需压力,此方法可将手动放置砝码达到平衡的过程转变为天平实时连续读取力值最终实现平衡的过程.在装置设计中,实验分析论证了磁铁对电子天平的示数影响,并通过压力输出测试实验与分析,获得了磁铁间距与磁力输出的精确关系,证明了本文提出并搭建的磁平衡法压力计量方法与装置是有效的,以电磁平衡法替代活塞式压力计中的微小砝码是可行的.
Abstract
In piston pressure measurement,small pressure changes rely on small weights,which cannot achieve continuous change of pressure output,and weights-based pressure measurement also has difficulties in automation.This paper proposes a pressure measurement device using magnetic balance based on opto-mechanical design,to explore the feasibility of the electromagnetic balance method to achieve pressure measurement.In the device,the weight gravity measurement originally used for balance is replaced by an electronic scale,without manual weight addition and subtraction,and the balance force is directly weighed by the scale.Through magnetic repulsion,the spacing in the magnet pair is adjusted to continuously output the required pressure.This method can transform the process of manually placing weights for the balance into the process of real-time continuous force value reading of the scale to finally achieve balance.The experimental analysis demonstrates the influence of the magnet on the reading of the electronic scale.In the pressure output test experiment and analysis,the precise relationship of the distance between the magnets and the magnetic force output is obtained,which proves that the device is effective.It is feasible to replace the small weight in piston manometer with the electromagnetic balance method.
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