1 Shell and pump cover 1.1 The shell and pump cover shall not be cracked or large defects such as trachoma, ceramic lining shall not be damaged.
1.2 Cast iron pump cover and shell end corrosion or erosion serious, can not guarantee the sealing requirements, should be scrapped. If the lining of the ceramic pump cover is damaged, it can be repaired by replacing the liner.
2 Spindle, impeller and sleeve 2.1 spindle should not have corrosion, cracks and other defects.
2.2 Spindle and rolling bearing with H7 / js6 or H7 / k6
2.3 spindle and impeller with H7 / m6.
2.4 Both ends of the impeller and the gap between the front cover and rear cover shall comply with the provisions of Table 5:
The sum of the clearance between the impeller and the pump before and after the cover Sz-1: install the gap 0.30, overhaul gap 0.40, replace the gap 1;
Sz-2: Installation clearance 0.30, Service clearance 0.40, Change clearance 1;
Sz-3: Installation clearance 0.40, Service clearance 0.50, Change clearance 1;
Sz-4: Installation clearance 0.40, Service clearance 0.50, Change clearance 1;
2.5 Spindle straightness should be Φ0.08-0.10mm / m.
2.6 impeller blades should not have burrs and cracks.
2.7 serious impeller corrosion or blade thickness reduced by half, it should be replaced.
2.8 Concentricity of impeller and shaft hole is Φ0.06mm.
2.9 impeller balance test should be done when necessary, its requirements should be consistent with the provisions:
SZ-2: Impeller speed: 1450r / min, Impeller width / Impeller diameter: 220/200 = 1.10, Balance type: Dynamic balance area, Measured on the impeller diameter Allowable deviation Static balance Allowable deviation 5g, Dynamic balance Allow residual amplitude 0.06 ~ 0.08mm
SZ-3: impeller speed: 975r / min, impeller width / impeller diameter: 320/332 = 0.93, balance types: static and dynamic balance area, measured on the impeller diameter tolerances static balance allowable deviation 8g, dynamic balance allowed residual amplitude 0.07 ~ 0.10mm
SZ-4: Impeller speed: 730r / min, Impeller width / Impeller diameter: 520/450 = 1.15, Balance type: Static and dynamic balance area, Measured on the impeller diameter Allowable deviation Static balance Allowable deviation 10g, Dynamic balance Allow residual amplitude 0.07 ~ 0.10mm
2.10 Impeller and shaft assembly, the end of the round beating is 0.10mm.
2.11 sleeve and shaft shall not use the same material, so as not to bite.
2.12 The end face of the shaft perpendicular to the axis is Φ0.01mm.
2.13 Sleeve and shaft contact surface roughness of not more than 1.6, using H7 / h6 with.
3 sealing device 3.1 packing seal 3.1.1 packing gland end face and packing box end face should be parallel, tightness of the fastening bolts should be consistent to avoid bias.
3.1.2 gland into the depth of the stuffing box is generally a circle of filler height, but not less than 5.00mm.
3.1.3 Filler incision should be parallel, neat, not loose, incision 30o angle, the filler should be staggered when the interface 120o.
3.2 mechanical seal 3.2.1 dynamic and static ring surface quality is good, does not allow defects, cracks, radial scratches and other defects.
3.2.2 The seals should be intact, rubber seals should be replaced each time you remove.
3.2.3 spring performance is good, no significant deformation.
4 Rolling bearings 4.1 roller bearings and slide surface should be no scars, spots, smooth contact surface, no noise rotation.
4.2 Rolling bearing outer ring with the bearing should be H7 / h6.
4.3 When mounting the bearing, the rear bearing should be fixed and the front bearing (on the motor side) should have an axial clearance of 0.20-0.30mm.
4.4 hot mounted bearings, with 100-120 ℃ oil and oil bath bearings 10-15 minutes, or heated with electric heaters, non-direct flame heating is strictly prohibited.
5 Flexible Couplings 5.1 Flexible Couplings and Shafts with H7 / js6 or H7 / k6.
5.2 The radial coupling of two halves should not be greater than 0.07-0.09mm. '
5.3 elastic sleeve pin with uranium two-axis deviation and the gap between the end face of the coupling shall comply with the provisions of Table 7

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