Horizontal multi-stage pump pump shaft lock fault reason analysis and check the maintenance process

Horizontal multistage pump in power plant, building, life has been widely used, and the horizontal multistage pump once appear, fault, may cause the whole production stopped, the corresponding inspection maintenance work must be done. Horizontal multi-stage pump at run time if there is a big noise, motor current surge, the outlet pressure is reduced, the vibration of the drive end bearing, can preliminarily identified as fault, water pump shaft, holding in death of the horizontal multi-stage pump water pump shaft lock fault how to check the maintenance process?

horizontal multi-stage pump pump shaft lock failure cause analysis:

1. In the pump and motor shaft for deviation, local bolt installation not fixed to loosen or coupling when the connection is not reasonable, easy to cause the water pump and motor shaft in deviation, the motor once started, will cause two rotor, holding in death of. Warm the pump work does not reach the designated position, the fastest will cause pump shaft load lock. If the machine was in a state of cold, warm startup needs enough pump work, because the boiler water temperature is higher, if warm pump work does not reach the designated position, is likely to increase in boiler water flow pump inside and outside temperature difference, the status of the uneven expansion. In addition, when the drum need a lot of water, the recharge rate of the pump should be uniform, if a sudden increase supply flow, overload, the pump shaft will form a larger impact, leading to the rotor, holding in death of happening. 3. Stop the pump time too early. In just stop the pump work, due to the long run, a shaft is still in the hot, barring incomplete, has not been in a cold, once stopped for a long time, a shaft bending deformation is easy to happen, so that when you restart a rotating shaft. 4. Impurities clogging. Caused by is commissioning phase, the rotor, holding in death of the possibility for many reasons, such as drum and pipe flushing is not thorough, impurities to enter, in the water supply system is filled with scrap iron, welding slag many hard impurities, the pump flow channel cause jams, cause a shaft lock 5. Rotor support parts loose, if the bracket is loose, bearing is not fixed, a shaft center will have a certain degree of deviation, and motor shaft, bearing is damage, cause a shaft lock. Influenced by structure, bearing damping, and stiffness in vertical and horizontal direction there is a big difference, when motor and shaft to the deviation of the difference is bigger, but its offset value reaches a certain degree, will change the working conditions, the bearing axis of instability.

horizontal multi-stage pump pump shaft collapse check: due to the horizontal multistage pump, pump shaft, holding in death of the horizontal multi-stage centrifugal pump can not work normally, need to strip inspection, further to understand the status of the fault. 1. For the failure of pump, if the disk dynamic coupling with the hand, is difficult. Motor and pump are faced with the risk of damaged, in order to ensure the safety of its spread effectively restrain the fault, immediately disconnect the power switch, and cannot be restarted. Remove the anchor bolt, the centrifugal pump to the repair shop for maintenance. 2. Detailed reading was studied for the product specifications and manufacturing drawings, familiar with the structure, working principle and performance of master pump, etc. , thus preventing hastily removed. Then, the required special tools to be complete, thoroughly clean up the site, with convenient place after removal of a variety of 3 parts. Pull down the bolt, the disintegration of the pump work. Should be in the correct sequence to remove, begin with accessories, and then the parts of pump itself, by inside and outside to remove: if some parts installation Angle or position of the limitation of demolition should be obvious markers, to provide convenient installation work. In addition, the disassembly should also make a record of each components fit clearance work, provide convenience for complex loading and repetition measurement conditions. Remove the approach is reasonable, not at all, remove the components of the classification.

       4. Check after removal of parts and clear the grease on the bearing, observe whether cage is distorted, if the ball wasn't damaged and outer track, show that the bearing can be used normally; Check whether there is any damage on the sealing strip, the internal spring is distorted: shaft lock, whether its bending deformation; To examine the impeller, found no hard impurities cause scratches, and there are no signs of cracks and action to touch the ground. 5. After a careful check, four failure of centrifugal pump, only two scratches in the rotation, but there was no other parts damaged, this needs further to analyze the cause of the problem.

horizontal multi-stage pump treatment countermeasure and the pump shaft, holding in death of the complex loading work: for anchor bolt to be fixed, prevent loose. Adopts high precision level check the pump and motor base levelness, the elements are conform to the requirement of installation, installation work no problem, without grouting again. Because it is a failure, horizontal multistage pump rotor, holding in death of the difficulty of motor and pump shaft to check the case, but check the data representation in the qualified range, to the good. If in the cold start the multistage pump, is easy to cause the difference in temperature, therefore, maintenance staff should adopt appropriate warm pump scheme, do sufficient warm pump work. Returned it should work in strict accordance with the steps used to inverse the collapse, especially the dynamic and static clearance, axial channeling control of momentum, needs to strengthen. After loading after work, in the work place, build a dial indicator on the coupling, and motor shaft coupling is a good of, then tighten the anchor bolts and the coupling bolt. Plate moving axis with the hand, if there is no jamming, pump can try.

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