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蒸汽流擴散泵的分類

發布時間:2017年04月29日 09:23   閱讀:5297   返回   來源:澤德

  蒸汽流擴散泵可根據工作液不同;結構材料不同和結構形式不同分類。

  按擴散泵的工作液分類有汞擴散泵和油擴散泵兩種。汞對人體有害,而且汞的飽和蒸氣壓高,即使加冷凝器它的極限真空也比不上油擴散泵。因此目前大量使用的是油擴散泵,汞擴散泵僅用于被抽容器中存在汞蒸氣的特殊情況(如熒光燈的排氣系統中)。

  按擴散泵的結構材料分類有金屬擴散泵和玻璃擴散泵兩種。玻璃擴散泵抽速較小,最大每秒僅有幾百升。但是玻璃擴散泵制造簡單,泵體本身以及與真空系統連接的地方都有可靠的氣密性,還有玻璃的透明性,可以用眼睛直接觀察擴散泵的工作狀態,所以在電光源生產上有著廣泛的應用。金屬擴散泵的抽速可以做得小,也可以制得較大,最大可達每秒十多萬升。

  按結構形式分類有立式泵和臥式泵;單級泵和多級泵。目前使用最多的是三級和四級立式擴散泵。

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