无油真空泵和油式真空泵的区别,如何选择实验室真空泵

  • Article source:Industry News
  • Website editor:莱诺真空泵
  • Reading volume:
  • Publication time:2022-09-22 11:12:53

无油真空泵又称干式真空泵是泵的工作腔内没有任何介质可以原汁原味的回收气体。而有油真空泵像旋片泵是靠介质油来工作,同样的水环泵是靠水来工作(那么水就受到污染)。

一、有油真空泵

有油真空泵是通过油来密封,润滑,降温,这个类型的真空泵可以接受一点水分,而无油真空泵由于叶片材质多是石墨制作的,如果遇到水分,就容易膨胀,损坏,但是无油真空泵用起来比较干净,在一些环境要求比较高的地方可以使用。

二、无油真空泵

它的工作原理和一般容积泵相同,由定子、转子、旋片、缸体、电机等主要零件组成。带有旋片的转子,偏心地安装在定缸内,当转子高速旋转时,转子槽内四个径向滑动旋片将泵腔分隔成四个工作室,由于离心力作用,旋片紧贴在缸壁,把定子进排出口分离开来,周而复始运转,进行变容,将吸入气体,从排气口排出,从而达到抽气目的。而实验室一般采用无油真空泵,其是一种直接连接电源既可以使用的真空泵,不需要添加水或者添加真空泵油。无油泵优势是操作简便,同时免保养。由于干式运行原理,真空泵工作室不会产生油雾挥发,或者泵油和水到吸入泵管的现象。无油真空泵适合用于真空抽滤或吸液、细胞培养液废液抽取,这些用途对真空度要求不高,如果使用油泵会倒吸油及油雾污染会影响实验。例如在抽滤时倒吸会污染已过滤的滤液,抽吸培养基上清液一般在洁净室也完全不能使用油泵或水循环真空泵类产品。部分真空度和抽速较高的无油真空泵,也可以用于搭配真空干燥箱或小型真空干燥器。

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