罗茨真空泵是一种旋转式容积真空泵，利用一对8字形转子在泵壳中保持一定的间隙作等速反向旋转而产生吸气和排气的运作
罗茨真空泵与其它油封式真空泵相比有以下特点：
1、罗茨真空泵在较宽的压力范围内有较大的抽速
2、罗茨真空泵的转子具有良好的几何对称性，故振动小，运转平稳。转子间及转子和壳体间均有间隙，不用润滑，摩擦损失小，可大大降低驱动功率，从而可实现较高转速
3、罗茨真空泵泵腔内无需用油密封和润滑，可减少油蒸气对真空系统的污染
4、泵腔内无压缩，无排气阀。罗茨真空泵结构简单、紧凑，对被抽气体中的灰尘和水蒸汽不敏感
5、压缩比较低，罗茨真空泵对氢气抽气效果差
6、罗茨真空泵的转子表面为形状较为复杂的曲线柱面，加工和检查比较困难
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