Roots blower and motor are connected by coupling to transmit motion and torque. Misalignment is a common fault of Roots blower, and 60% of the fan faults are related to misalignment. The misalignment fault of the fan refers to the inclination or offset degree between the axis lines of the two rotors of the fan and motor and the center line of the bearing. Main reasons for misalignment of Roots blower rotor system:

1.轴承间隙过大或滚珠有点蚀现象，这种情况一般是由于润滑不足或油质较差引起的，出现这种状况容易引起不对中而产生震动，应视情况更换轴承。

1. The bearing clearance is too large or the ball has pitting corrosion, which is generally caused by insufficient lubrication or poor oil quality. This condition is likely to cause misalignment and vibration, so the bearing should be replaced as appropriate.

2.轴承座长时间震动产生偏移。由于大型罗茨风机产生震动是不可避免的，这样就容易造成底座紧固螺栓轻微松动，后果就是引起不对中而震动。

2. The bearing pedestal vibrates for a long time, causing displacement. As the vibration of large Roots blower is inevitable, it is easy to cause slight looseness of the fastening bolts of the base, resulting in misalignment and vibration.

3.主电机本身引起的。大型电机对动平衡本身要求较高，长时间运行由于各种原因，电机本身动平衡破坏而要求不对中等等。

3. It is caused by the main motor itself. Large motors have high requirements for dynamic balance itself. Due to various reasons, the dynamic balance of the motor itself is damaged and the requirements are misaligned.

小结：罗茨风机转子系统产生不对中故障后，在旋转过程中会产生一系列对设备运行不利的动态效应，引起联轴器的偏转、轴承的磨损、油膜稳态和轴的挠曲变形等，使转子受力及轴承所受的附加力导致罗茨风机的异常震动和轴承的早期损坏，危害非常大。对于风机的不对中故障，目前我们一般采取原始办法来处理。对罗茨风机主轴找水平，并且盘动叶轮旋转，保证风机主轴在每个点的水平度偏差在范围内；然后对风机与电机联轴器找对中度，一般采用百分表，分四个点检测跳动度，保证四个点跳动度在技术范围内，这样对中度基本找好了。的办法可以用激光对中仪来解决，方便快捷。

Summary: After the misalignment fault occurs in the rotor system of Roots blower, a series of dynamic effects adverse to equipment operation will be generated during the rotation process, which will cause the deflection of the coupling, wear of the bearing, oil film stability, shaft deflection and deformation, etc., so that the force on the rotor and the additional force on the bearing will lead to abnormal vibration of Roots blower and early damage of the bearing, which is very harmful. At present, we generally adopt the original method to deal with the misalignment fault of the fan. Firstly, level the main shaft of Roots blower, and turn the impeller to rotate to ensure that the levelness deviation of the main shaft of the blower at each point is within the range; Then, align the fan and motor coupling. Generally, use a dial indicator to detect the runout at four points to ensure that the runout at four points is within the technical range, so that the alignment is basically found. The advanced method can be solved by laser alignment instrument, which is convenient and fast.

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