Roots fan spindle component accuracy, refers to the rotational accuracy after assembly and adjustment, which includes the spindle radial circular runout, axial runout and spindle rotation uniformity and smoothness. Factors affecting the rotational accuracy of the spindle components are as follows.

I. Factors affecting radial circular runout of spindle parts

1, the accuracy of the spindle itself. Such as spindle journal of different axis, taper and out of roundness. Spindle journal of different axis will directly cause the radial runout of the spindle, and spindle journal of taper and out of roundness in the assembly will cause deformation of the inner raceway of the rolling bearing, destroying its accuracy.

2, the accuracy of the bearing itself. One of the most important is the bearing inner raceway surface of the out-of-roundness, roughness, and rolling body size difference or sliding bearing shingle quality.

3, the speed booster shell before and after the bearing hole of different axiality, taper and not roundness will cause deformation of the bearing jacket, the bearing can be adjusted to get the minimum clearance to be affected.

Second, the factors affecting the axial runout of spindle parts

1. Non-perpendicularity and runout of spindle journal shoulder table.

2. The axial circular runout and non-parallelism of the nuts, bushings, washers, etc. of the fastened bearings.

3, the bearing itself axial circular runout and axial runout.

4. Axial circular runout of the bearing shell hole of the speed increaser.

III. Factors affecting the uniformity and smoothness of rotation of spindle parts

Dealing with the spindle and rotating parts on the shaft, such as gears, pulleys or couplings and other precision and assembly quality, external vibration sources and motors, turbines, forging hammers and other important causes of spindle vibration. The impeller manufacturing quality is more important, it will be the rotor output vibration and direct damage to the spindle rotation uniformity and smoothness.

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