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离子漏斗是质谱传输系统的一种,具有传输、聚焦离子等作用。由于压力差的作用,从离子漏斗进入质量分析器的空气会造成质量分析器真空度降低,影响质谱灵敏度。为了增大下一级质量分析器的真空度,对离子漏斗内部气体运动规律进行研究。利用Fluent软件并基于Density-Based、Implicit算法首次对低真空状态下的质子转移反应质谱仪中离子漏斗及改进后的结构内部粘滞流状态气体流动进行模拟、对比,根据模拟结果得出了气体运动的基本规律,加挡板改进后的结构能有效的降低挡板后的速度。经过分析,挡板横截面直径为10mm,到入口距离为20mm时速度降低效果明显,对质谱仪灵敏度的增强有较大的意义。
Ion funnel is a mass spectrometry transmission system, with transmission, focusing ions and so on. Due to the pressure difference, the air entering the analyzer from the ion funnel will cause the analyzer vacuum to decrease, affecting the mass spectral sensitivity. In order to increase the vacuum degree of the next level analyzer, the gas movement inside the ion funnel is studied. Using Fluent software and based on Density-Based, implicit algorithm for the first time in the low vacuum proton transfer reaction mass spectrometer ion funnel and improved viscous flow inside the structure of the gas flow simulation, comparison, based on the simulation results obtained gas The basic law of movement, plus baffle improved structure can effectively reduce the baffle speed. After analysis, the baffle cross-sectional diameter of 10mm, to the inlet distance of 20mm speed reduction effect is obvious, the sensitivity of the mass spectrometer has a greater significance.