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.軸承間隙過大或滾珠有點蝕現(xiàn)象，這種情況一般是由于潤滑不足或油質(zhì)較差引起的，出現(xiàn)這種狀況容易引起不對中而產(chǎn)生震動，應(yīng)視情況更換軸承。

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.軸承座長時間震動產(chǎn)生偏移。由于大型羅茨風(fēng)機產(chǎn)生震動是不可避免的，這樣就容易造成底座緊固螺栓輕微松動，后果就是引起不對中而震動。

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.主電機本身引起的。大型電機對動平衡本身要求較高，長時間運行由于各種原因，電機本身動平衡破壞而要求不對中等等。

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.

小結(jié)：羅茨風(fēng)機轉(zhuǎn)子系統(tǒng)產(chǎn)生不對中故障后，在旋轉(zhuǎn)過程中會產(chǎn)生一系列對設(shè)備運行不利的動態(tài)效應(yīng)，引起聯(lián)軸器的偏轉(zhuǎn)、軸承的磨損、油膜穩(wěn)態(tài)和軸的撓曲變形等，使轉(zhuǎn)子受力及軸承所受的附加力導(dǎo)致羅茨風(fēng)機的異常震動和軸承的早期損壞，危害非常大。對于風(fēng)機的不對中故障，目前我們一般采取原始辦法來處理。對羅茨風(fēng)機主軸找水平，并且盤動葉輪旋轉(zhuǎn)，保證風(fēng)機主軸在每個點的水平度偏差在范圍內(nèi)；然后對風(fēng)機與電機聯(lián)軸器找對中度，一般采用百分表，分四個點檢測跳動度，保證四個點跳動度在技術(shù)范圍內(nèi)，這樣對中度基本找好了。的辦法可以用激光對中儀來解決，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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