Assembly method of centrifugal pump impeller

Centrifugal pump impeller bore and journal between the gap with the gap between the value of 0.1 ~ 0.15 mm. When the impeller is to be fitted, the impeller shall be slid on the journal without swinging. When the gap is too small, you can use the file cutting method to reduce the size of the shaft diameter, but also in the lathe on the impeller of the hole car larger, in order to ensure that the gap should be. When the gap is too large, replace the new impeller so that the clearance accuracy is not affected by the clearance.
When assembling the centrifugal pump impeller to the shoulder, the M should be facing the pump body out of the M pipe, should not produce axial displacement. No friction between the impeller back and the pump body, but the axial gap between them can not be too large. If the axial clearance is large here, the amount of leakage of the axial seal is increased. In order to reduce the axial clearance here, the thickness of the gasket on the front and rear axle cover can be readjusted, that is, the thickness of the gasket of the front bearing of the pump to the M side is thinned and will be close to the coupling The thickness of the rear bearing gland is thickened. In adjusting the thickness of the bearing gland gasket, the total weight of the front and rear bearing glands should be equal to the total thickness of the original assembly, ie the thickness of the front bearing gland pad minus the thickness of the rear bearing gland pad To be equal. While adjusting the gasket, tap the pump shaft slightly rearward to move it a very small distance, and then press the rear cover, thus reducing the axial clearance between the impeller's back and the pump The If the back of the impeller and the pump body is too small between the friction between the friction, the adjustment of the gasket is the same as above, but the rear bearing gland pad thinner, the front bearing gland pad thickening, and the pump shaft Move forward a little distance can be.