旋片真空泵气镇阀优缺点

  • Article source:Industry News
  • Website editor:莱诺真空泵
  • Reading volume:
  • Publication time:2020-04-13 11:02:23
旋片真空泵气镇原理:

油封机械真空泵的压缩室上开一小孔,并装上调节阀,当打开阀并调节入气量,转子转到某一位置,空气就通过此孔掺入压缩室以降低压缩比,从而使大部分蒸汽不致凝结而和掺入的气体一起被排除泵外起此作用的阀门称为气镇阀

原因:由于真空泵的抽气过程是一压缩过程,故当有水蒸汽之类的可凝性气体时,如果在排出泵腔前达到其饱和蒸汽压力,则会凝结在油中,使泵油乳化变质,润滑密封性能变坏,凝结物在吸气腔中还会重新变成气态,使真空度降低

原理:排气腔的压力是由空气分压力和蒸汽分压力二部分组成的,只有当二者之和足以克服排气阀的大气压力和弹力时,才发生排气。气镇阀的作用,是在排气发生之前向泵的排气腔充入一定量空气,以降低排气压力中的蒸汽分压力,当它低于泵温下的饱和蒸汽压时,即可随充入气体排出泵外,而避免凝结在泵油中。另外,当密闭泵口运转时,已混入油内的可凝性气体的凝结物或气相就会溶于油中,油中的物质又会在泵腔内从油中逸出,这时如果开气镇工作,也可抽除一定量的可凝性物质,从而起到一定净化作用,延长泵油的使用期。真空泵油较贵,货源亦有限,因此合理使用气镇有着很大的经济意义
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气镇阀优缺点

优点:

满足抽出潮湿空气的要求,而不致水蒸气污染油质

可以恢复真空泵的极限压力

净化真空泵的泵油

恢复真空泵的极限真空度


缺点:

大气会漏入到泵的吸气端,影响泵的抽速与极限真空,使泵的极限真空度降低。但是仅在气镇阀工作的时候才有影响

在油封旋片真空泵中,国内习惯上称皮带传动的为旋片真空泵,而把泵与电机直接连接或用联轴器连接的称为直联旋片真空泵。并且有单级和双级之分。普诺克旋片真空泵共同特点是结构较简单,使用方便,能从大气压力下起动,可直接排入大气,偏心质量较小,维护简便,双级泵的极限压力为6×10-2~1×10-2Pa,单级泵的极限压力为10~200Pa左右

Article source:https://www.leynow.com.cn/news/415.html

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