Power plants in addition to the brine for pump motor bearing high temperature solutions

A certain power plant in addition to salt water stations a total of 5 for in addition to salt water pump, bearing factory in addition to salt water supply. The pump of the drive motor: Y3315M - model 2搭配; The power of 132 kw. Yet every summer hot weather, the motor bearing high temperature (5 Up to 90 ℃) By repeated motor overhaul, bearing replacement, and the type of grease is still no improvement after debugging. Every year during the summer high temperature requirements operation and maintenance personnel for special inspection, the five motors brought great effort, to the operation at the same time also to the stability of the factory in addition to salt water pipe network pressure brought bigger risk.

except salt analysis for water pump motor bearing temperature plateau

since this series motors are simply chassis, bearing high temperature, and motor noumenon and both ends of bearing vibration, motor noise, current, etc are all within the normal range, so can be ruled out because of anchor bolt looseness, motor rotor imbalance, coupling on the temperature rise caused by factors such as bad.

      ( 1) High ambient temperature: for motor, especially exposed at the scene, the pump and the heat and direct sunlight to the influence of the temperature of the motor bearing particularly evident, especially from three to five in the afternoon, the motor bearing temperature almost reached the peak of temperature, relative to the nearly 10 ℃ higher than that of the evening.

      ( 2) External load volatility: for in addition to salt water pump outside the normal run time is 3 pump operation, when the load suddenly increases, in addition to salt water pipe network pressure is reduced, increases the output of water pump, motor overload operation, resulting in bearing temperature casing on the high side.

      ( 3) Grease filling is not reasonable: motor grease filling amount, inadequate or excessive can cause bearing temperature on the high side, and the filling of the grease unlike oil, which can directly read the liquid level, only with the experience of maintenance personnel, so that each filling grease quantity is not easy to grasp. Or to set time failed to timely filling grease, long running the grease emulsification, deterioration, not good lubrication and cooling effect.

      ( 4) High temperature in the motor itself: considering the temperature of the motor end cover before the runtime is generally higher than motor drive end bearing temperature, and the motor maintenance unit zhongke electromechanical series motors are identified, problems of internal structure, the test results for this batch of motor to prevent heat from inside the stator iron core is very good. At the same time this batch of motor has been run continuously since in addition to salt water station was put into operation, a longer operating life, coil anti aging, heat dissipation can cause temperature rise of the motor itself.

in addition to salt water supply pump motor bearing high temperature solution

1) Motor repair: check the motor stator winding, if there are flicking boring, slightly boring, motor coil insulation aging or unqualified phenomenon, need to change the motor stator winding; Check whether the motor rotor dynamic balancing is accord with a standard, if does not meet the required weight, the standard of dynamic balance; Check the motor shaft, see if there is a bend of shaft center; Check whether the motor drive, the drive bearing chamber wear, whether there is a race bearing outer or inner ring phenomenon; 2, 6317 / C3 bearing replacement motor back to start-up.

      ( 2) Motor transformation: the series motor after the repair, the related result is not ideal, stop motor heat from the internal disintegration of stator iron core, detected the rotor temperature of 70 ℃, the stator temperature is 72 ℃. Because the stator iron core and internal cooling in motor design has to finalize the design, through the maintenance can't change the status quo. In the center of the and equipment and electrical professional communication obtain consent, decided to replace the cooling fan and fan casing drilling to increase into the air to the motor stator cooling. Drive end end cover increase induced air cover to give at the same time the drive end bearing ventilation cooling. Again after the no-load test results are as follows: the environment temperature of 35 ℃, measured stator temperature of 55 ℃, drive end bearing temperature for 52 ℃, returned it after loading the related, motor drive end bearing temperature up to 60 ℃. Cooling effect is obvious, the related results show that the highest temperature of end bearing motor driving are 60 ℃.

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