Seal of centrifugal pump, impeller, shaft parts, such as the maintenance is introduced

Mechanical seal centrifugal pump is a water pump casing, impeller, shaft, support, motor parts, such as the use of centrifugal pump is very common, centrifugal pump after a long time use will inevitably fail, for parts, seal, impeller, shaft repair method is introduced to vulnerable parts do you know? Detailed below this several parts inspection methods and installation: a centrifugal pump mechanical seal 1, gland and static ring sealing ring contact parts, roughness in Ra3. 2. Gland and the diameter of the shaft sleeve clearance of 0. 75-1. 00 mm, capping and sealing gasket thickness between the cavity for 1 ~ 2 mm. 2, installation, mechanical seal parts of the shaft or shaft sleeve, the surface can not have rusty spot, defects such as cracks, roughness Ra1. 6. Gland bolts should be uniform tightening, prevent gland face tilt. After the static ring into the gland, should check the static ring without deviation. 3, according to all that the axial thrust using rolling bearing pump, the axial clearance of bearing outer ring should be 0. 02 ~ 0. 06mm。 Rolling bearing dismantling, will use the hot charging temperature does not exceed 120 ℃, it is forbidden to use directly flame heating, high frequency induction heater is recommended for the. Rolling bearings of rolling element and raceway surface should be no corrosion, pit scar with spots, contact smooth without a murmur, remain intact. 4, mechanical seal and coil spring XuanXiangYing and pump shaft rotate in opposite directions. After the spring compression work length should comply with the design requirements. Second, with the impeller, the impeller and shaft 1 for H7 / js6. Replacement impeller should be static balance and work the impeller speed at 3000 r/min, allow surplus imbalance on outside diameter shall not be greater than the requirements of table 6. When necessary after assembly rotor dynamic balance check, under normal circumstances, the dynamic balancing precision to reach 6. Level 3. 2, balance calibration, general situation in the impeller is heavy, but cutting thickness shall not be greater than 1/3 of the impeller wall thickness. 3, for the hot oil pump, the impeller and shaft assembly, button at the top of the zero shall be maintained. 10 to 0. 40 mm clearance, before and after impeller and partition the axial clearance of not less than 1 ~ 2 mm. 3, line 1, the main neck cylindricity for trunnion of 0. 25%, big value less than 0. 025 mm, and the surface should be no scars, the surface roughness of Ra1. 6. 2, shell ring and the impeller mouth ring, between watts and the diameter of the shaft sleeve clearance value should comply with the requirements in the middle. Based on two shaft neck, look for coupling and shaft radial circular run-out tolerance in the central part of the value is 0. 04mm。 3, the rotor and the water pump body after assembly, determining total amount of axial channeling, rotor rotor fixed center should take half the amount of total channeling; For supporting the hot oil pump, the entrance of the axial clearance should be bigger than export the axial clearance of 0. 5 ~ 1. 00mm。
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