Centrifugal pump parts maintenance standards are as follows: First, the pump shaft 1, clean and check the pump shaft, the pump shaft should be free of cracks, serious wear and tear and other defects. If there is wear, cracks, erosion, etc., should be detailed records, and analyze the reasons. 2, testing the straightness of the pump shaft, its value should not be greater than 0.05mm in length. Journal surface shall not have pits, grooves and other defects, the maximum allowable surface roughness of 0.8μm, spindle circularity and cylindricity error should be less than 0.02mm. 3, keyway centerline parallel to the axis of the center line error should be less than 0.03mm / 100 Second, the impeller 1, clean and check all levels of impeller surface, the impeller surface should be free of cracks, wear and other defects, impeller runner surface should be smooth, and no Scaling, burrs, leaves should be no cracks, erosion thinning and other defects. 2. Inspect the impeller inlet and outlet seal rings at all levels without loosening. The surface of the seal ring is smooth and burr-free. The maximum allowable value of the surface roughness Ra is 0.8μm and the clearance between the impeller and the impeller should be 0.05 ~ 0.10mm. Impeller hole as a benchmark, check the impeller radial runout should not exceed 0.05 mm. End runout is not greater than 0.04 mm. 3, Impeller and shaft with interference fit, generally H7 / h6. Key and keyway interference with the amount of 0.09 ~ 0.12 mm, after assembly, the key top of the gap is 0.04 ~ 0.07 mm. 4, Impeller for static balance. Third, the pump head, pump housing and guide vane 1, clean and check all levels of impeller, there should be no wear, cracks, erosion and other defects. 2, Anti-rotation guide vane wheel should be no bending, broken and loose. Pump head, pump housing seal ring surface should be no pitting, scars, grooves, the maximum allowable surface roughness Ra of 0.8μm, the seal ring and the pump head, the pump assembly clearance of 0.05 ~ 0.10mm, the seal ring should Not loose. 3, to the pump head, pump housing only the mouth as a benchmark, measurement ring radial bore circle beating, the value of not more than 0.50 mm, the end round beating should not exceed 0.04 mm. 4, measuring the amount of the gap between the pump head, pump housing seal ring and seal ring assembly, the value should be between 0.50 ~ 0.60 mm. Fourth, the throttle seal 1, clean and check the throttle seal surface, there should be no cracks, partial wear and other defects, the maximum allowable surface roughness Ra 0.8μm; 2, throttle seal and pump body H7 / p6 with. Take the outer circle as a reference and measure the radial runout of the inner bore. The value should not be more than 0.02mm. 3. Measure the clearance between the throttle seal and the pump shaft. The value should be between 0.25 and 0.30 mm.
