罗茨鼓风机因其排气压力在允许范围内，调节时具有流量变动小、压力选择范围宽和强制输气的特点，因而在冶金、化工及环保行业得到广泛应用。罗茨鼓风机工作时最重要的便是叶轮，但由于长时间的使用，会出现一系列因受损或污染造成的操作故障或工作异常。

　　Roots blower is widely used in metallurgy, chemical and environmental protection industries due to its exhaust pressure being within the allowable range, small flow rate variation during adjustment, wide pressure selection range, and forced gas transmission characteristics. The most important component of a Roots blower during operation is the impeller, but due to prolonged use, a series of operational failures or abnormalities may occur due to damage or contamination.

　　接下来，我们聊一聊罗茨鼓风机叶轮故障该采用的修复方法。

　　Next, let's talk about the repair methods that should be adopted for Roots blower impeller faults.

　　01如果罗茨鼓风机叶轮的铆钉头部被磨损，可以通过压紧叶轮体与轮毂用电焊堆焊，让磨损的铆钉头部回到原来的正常状态。

　　If the rivet head of the Roots blower impeller is worn, the worn rivet head can be restored to its original normal state by welding and welding the impeller body and hub tightly.

　　02如果铆钉孔处容易产生疲劳裂纹，可用整根没有用过的新焊条焊接修复裂纹，但要注意以叶轮轴心线为中心对称进行，将该裂纹处补焊剩下的焊条留在该处，再用一根新焊条修补相对称的铆钉孔裂纹，焊完后剩下的焊条与对称铆钉修补时剩下的焊条一样长，以保证焊补上去的重量相等。

　　If fatigue cracks are prone to occur at the rivet hole, a new unused welding rod can be used to weld and repair the crack, but attention should be paid to symmetrical welding around the impeller axis. Leave the remaining welding rod at the crack repair location, and then use a new welding rod to repair the relatively symmetrical rivet hole crack. After welding, the remaining welding rod is the same length as the one left during symmetrical rivet repair to ensure that the weight of the welded repair is equal.

　　若是对称的铆钉孔处无裂纹也要将焊条堆焊于此处，用来抵消对称铆钉孔裂纹处新补的焊接重量。按照这种对称补重的方法焊接，就可以修复裂纹。

　　If there are no cracks at the symmetrical rivet hole, the welding rod should also be welded here to offset the newly added welding weight at the symmetrical rivet hole crack. By welding using this symmetrical weight repair method, cracks can be repaired.

　　03对罗茨鼓风机叶轮进行简单的动平衡试验，方法也很简单。把叶轮支起后用手拨动使之轻轻旋转，达不到平衡的地方会停到最低点而且会左右摆动。

　　03 Conduct a simple dynamic balance test on the impeller of the Roots blower, and the method is also very simple. After supporting the impeller, gently rotate it by hand. If it cannot reach balance, it will stop at the lowest point and swing left and right.

　　若有偏重可在对面的叶轮上点焊，增加重量使其平衡，或者用角磨机磨去偏重叶轮的焊痕，也能达到平衡，这样就可以把三叶罗茨鼓风机修复好进行正常工作了。

　　If there is a bias, spot welding can be done on the opposite impeller to increase its weight and balance it, or the welding marks on the bias impeller can be ground off with an angle grinder to achieve balance. This way, the three blade Roots blower can be repaired and operate normally.

　　在对罗茨鼓风机的修理过程中，不能用电焊随意点焊，将焊痕留到叶轮上，避免影响罗茨鼓风机叶轮的平衡，这不但达不到修复的目的，反而造成更大的损失。

　　During the repair process of the Roots blower, welding should not be used randomly to spot weld, leaving welding marks on the impeller to avoid affecting the balance of the Roots blower impeller. This not only fails to achieve the purpose of repair, but also causes greater losses.

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