What are the necessary maintenance for submersible pumps?

Dadonghai Pump Technical Support: 4, to ensure that the seal: agricultural submersible pumps on the sealing requirements are very strict, in the replacement of sealed indoor lubricants, if you find the oily turbidity and high water content, you must replace the entire replacement or replace the seal box or Sealing ring to ensure good sealing performance.

5. Drying motor: Measure the insulation resistance of the winding and the shell of the submersible pump with a 500 megohmmeter. If the resistance is lower than 0.5 megohms, the motor water should be driven off. Drying methods include: external drying method, current drying method, and a combination of the two drying methods. The external drying method is to use an external heat source for treatment. Common measures include: (1) blowing hot air: using an electric heater blower (a small agricultural submersible pump can use a hair dryer) blowing hot air to achieve the purpose of drying; (2) bulb baking: In a closed box, several 200-watt bulbs are used for baking. Pay attention to the baking temperature can not be too high, should be controlled below 125 °C; (3) current drying: according to the impedance of the submersible pump and the size of the power supply, the motor three-phase windings in series or in parallel, and then access a variable resistor, adjust the amount of current About 60% of the rated current, the power is dry.

6, to ensure that the bearing lubrication: The water-filled submersible pump should check the replacement of the upper and lower end cap bearing chamber skeleton oil seal and lithium grease. To ensure that the bearings work well under long-term lubrication conditions.

7, check the bearing: check the motor part of the upper and lower bearings, if it is found that the wear or clearance is too large, it is necessary to replace the new bearings in time, is strictly prohibited "sick" make do with. The inspection method is as follows: If the motor is running, a “click” sound is generated, and the cycle is proportional to the rotation speed, and when the rotor is turned by hand, it feels laborious. It is a bit astringent or avulsed on the bearing raceway; if the bearing is intermittent The "click" sound, there is an indeterminate dead point when turning the rotor by hand, generally the ball frame is damaged, the inner ring is broken or the ball is broken. In the above situation, the bearing must be replaced to avoid further damage.