1、电机噪声
电机质量良荞不一，电机噪声往往掩盖了罗茨真空泵的噪声，一是风扇噪声普遍都比较大，一般是塑料风扇变形所致；二是使用了质量不好的轴承所引起的轴承噪声
2、罗茨真空泵内部零件噪声
(1)转子碰撞
包括转子与转子、转子与泵体和转子与侧盖的碰撞噪声
主要原因：轴的刚度不足，转子和齿轮在轴上定位的径向移位，齿轮间隙过大或过小，轴承的轴向游隙过大等
(2)罗茨真空泵的齿轮
影响齿轮噪声的因素除齿轮本身的加工精度外，还有安装齿轮的二个转子轴的平行度
(3)轴承
除了轴承本身的精度外，设计不足也可能造成轴承噪声的增加，如轴承内、外圈安装过盈量过大，轴刚度不足，润滑油供应不足，以及受到粉尘、水、腐蚀性气体和液体污染等
罗茨真空泵在运转过程中传出的噪音声，基本是内部零部件之间的碰撞、磨损等产生，且这些容易发出声音的零部件也是比较容易磨损的物件，因此应该对罗茨真空泵设备进行定期检修、保养操作时，要重 点维护零部件
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