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What is the cause of excessive clearance of Roots blower? Here's the solution!

Source: Roots blower manufacturer Published on: February 28, 2022 Hits:

Roots blower Some faults may occur during use. Many people don't know how to repair them because they don't know much about them. Today, I will show you how to solve the problem of large clearance of roots blower.

The rotation mode is V-belt transmission. Its working principle is that there is an approximately elliptical casing and two wall panels to form a cylinder. When the long axes of the cross sections of the two impellers are parallel to each other, the "meshing point" just falls on the midpoint of the connecting line between the centers of the two rotors. A certain clearance shall be kept between two impellers, between impellers and wallboards, and between impellers and casings to ensure the policy operation of the fan. If the clearance is too large, the return flow of the compressed gas through the clearance will increase, affecting the efficiency of the fan; If the clearance is too small, thermal expansion may lead to collision between the impeller and the casing or between the impellers, affecting the normal operation of the fan.

Since the position of the bearing hole on the wallboard has been determined, the value of the total clearance is determined. The so-called clearance adjustment is mainly to distribute the taper clearance and non taper clearance on the node. During operation, due to the torsional deformation of the shaft and gear wear, the taper clearance tends to decrease, while the non taper clearance tends to increase. In order to ensure the long-term reliable operation of the blower, the taper clearance can be adjusted a little larger and the non taper clearance can be adjusted a little smaller during assembly. When the soft tooth surface gear is used for transmission, the gear wear is fast. Generally, the taper clearance is taken as about 2/3 of the total clearance, and the non taper clearance is taken as about 1/3 of the total clearance. When the gear is hard, the gear wear is very slow, and the taper clearance and non taper clearance can be roughly equal.

The original radial gap value of the bearing is determined according to the accuracy grade of the bearing. If the outer end of the impeller is found to rub against the casing, remove the fan gear box cover, loosen the bolts on both ends of the fan casing, and remove the locating pin. Put the outer diameter gauge on the drive gear and the pulley at the other end. Gently and symmetrically strike the gear and the belt pulley at the other end with a copper hammer, and measure with a feeler gauge every time. Repeat until the clearance meets the requirements, and then tighten the shell bolts at both ends symmetrically.

If it is found that the end face of the impeller rubs against the side wall plate of the casing, the clearance between the impeller and the side wall of the casing can be detected with a feeler gauge, the screws for fixing the bearing cover can be pulled out, and padding paper can be added or extracted between the bearing seat and the bearing cover near the pulley end to adjust, so that the impeller can move axially. Depending on the measured clearance. After correction, let's talk again; Tighten the bolts symmetrically in order to fix the bearing cover.

The above is the solution to the excessive clearance of Roots blower. I believe it will be helpful to you after reading it.

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