Shield pump troubleshooting tips Pump shield repair where to pay attention

[Asia Pump Network] Regular inspection of shielded pump In order to avoid and reduce the sudden damage of shielded pump accident, shielded pump requires regular maintenance. In case of bearing monitor "alarm", must be immediately overhaul. Chemical plant is generally continuous operation, shielding pump regular maintenance only when the device is scheduled to stop. Shielding Pumps Most shield pumps can be serviced once a year. Shielding pump troubleshooting tips Shielding pump repair should pay attention to what areas will shield pump disintegration: to improve the cleaning of parts, and then make an apparent inspection of them, whether there is any exception. And then measure the size of the hub site for electrical inspection of the motor windings. (1) Mechanical inspection, measuring the diameter of the graphite bearing and shaft sleeve diameter, and look at the surface finish with them. Such as graphite bearings and bushings with the clearance gap exceeds the test scale (0.55-11kw with the gap, the diameter difference of 0.4 mm, 15-45kw with the gap, the diameter difference of 0.5 mm) or with poor surface finish, according to the situation Replace bearing, sleeve or thrust plate. Measure and check the upper and lower outer impellers of the impeller and the size of the inner diameter of the buckle and the pump seat matched with them. Whether these two cooperating gaps are within the range delineated by the test scale, such as changing parts or adopting other Measures (such as: surfacing, set) to meet the requirements of the designated gap. Otherwise it will affect the shielding pump performance, flow, lift, axial balance and so on. Observe the inspection set, the apparent appearance of the rotor shield sleeve, with particular attention to whether there is any abnormal weld, if necessary, should be for testing, leak check. After long-term operation, the balance of the rolling department may change. Therefore, it is necessary to rotate the rotor together with the impeller and other rotating parts assembled to do dynamic balancing test. (2) electrical inspection, DC resistance check: three-phase resistance unbalance shall not exceed 2%. Insulation resistance check: shielding pump motor winding insulation resistance can generally reach more than 100MΩ. Such as less than 5MΩ need to analyze the reasons for insulation is damp, or shield pump sleeve leaks and so on. If no leakage through the stator shield no problem, then purely moisture insulation, the need for drying, such as the stator shield has a problem, you need to replace the shield sleeve. (Editor: Huang Nengwen QQ:)

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