The reasons for the damage of the shielding sleeve of the chemical shielding pump and the rotor shielding sleeve are mainly due to the bearing damage or wear exceeding the limit value and the damage of the stator and rotor shielding sleeves due to friction; secondly, due to chemical corrosion, welding seams and other places leakage. Insulation resistance check of chemical shield pump: The insulation resistance of shield pump motor winding can generally reach more than 100MΩ. Observe the inspection of the chemical shielding pump and the apparent situation of the rotor shielding sleeve, especially pay attention to whether there is any abnormality at the welding seam. (2) Electrical check DC resistance check: The unbalance of the three-phase resistance must not exceed 2%. Other measures (such as: surfacing welding, bushing) make the fit clearance meet the specified requirements.55-11kw matching clearance, diameter difference is 0. After a long period of operation, the balance of the rotating part may change. The maintenance method of chemical canned pump is: dismantle the canned pump: clean the parts first, then make an apparent inspection on them, whether there is any abnormality. If the matching clearance between the graphite bearing and the shaft sleeve exceeds the maintenance standard (0. Most canned pumps can be repaired once a year.4㎜, 15-45kw matching clearance, diameter difference is China Filter Suppliers 0. If the chemical monitor pump encounters an 'alarm' from the bearing monitor, it must be repaired immediately. Otherwise, it will affect the pump performance, flow, head, axial balance force, etc. Chemical plants are generally in continuous operation, and regular maintenance of canned pumps can only be carried out when the plant is scheduled to shut down. Then measure the dimensions of the key parts, and make electrical inspections on the motor windings (1) Mechanical inspection and measurement of the graphite bearing bore diameter and shaft sleeve shaft diameter, and observe the smoothness of their mating surfaces. Chemical canned pumps are mainly damaged in the following ways: (1) Graphite bearings, bushings and thrust plates are worn or dry due to shortage of lubricating fluid and damaged.The maintenance method of chemical canned pump is: dismantle the canned pump: clean the parts first, then make an apparent inspection on them, whether there is any abnormality. (3) The damage of the stator winding is the same as that of the ordinary motor: overload, short-circuit between turns, ground breakdown and other causes of damage to the stator winding, as well as the damage to the stator shield and the dielectric corrosion of the motor winding and winding insulation damage. Therefore, it is necessary to assemble the rotor together with the rotating parts such as the impeller to do the dynamic balance test. Whether these two clearances are within the range specified by the maintenance standard. Then measure the dimensions of the key parts and make electrical inspections of the motor windings.. If there is no problem with the leakage of the stator shielding sleeve, the insulation is purely damp and needs to be dried. The chemical shielding pump is measured to check the size of the upper and lower outer stop of the impeller and the inner diameter of the buckle and pump seat matched with them. Periodic maintenance of chemical canned pumps In order to avoid and reduce the sudden damage accidents of canned pumps, canned pumps need regular maintenance. If the reason is lower than 5MΩ, it is necessary to analyze the reason, whether the insulation is damp, or whether the shielding sleeve has leakage points, etc.5㎜) or when the mating surface finish is poor, the chemical shielding pump needs Replace bearings, bushings or thrust plates as appropriate. If necessary, it should be inspected for flaw detection and leak detection. If there is a problem with the stator shielding sleeve, The shielding sleeve needs to be replaced
