How to maintain the submersible pump

How to maintain the submersible pump

1. Check vulnerable parts:

Remove the water pump and check whether the impeller, retaining ring, shaft sleeve and bearing seat of the submersible pump are in good condition. 

It is forbidden to use damaged and unqualified parts than avoid accidents.

2. Replace lubricating oil: 

Open the oil hole screws in the sealing chamber and the motor respectively.

All the lubricating oil of is drained and replaced with new oil to ensure the normal operation of the lubricating system.

3. Remove the pump casing to prevent rusting: 

Before use in spring, in order to maintain the water-filled motor and prevent the parts from rusting and burning the motor, 

the top pump casing should be removed, and the impeller should be turned before closing and starting.

4. Ensure sealing: 

The agricultural submersible pump has strict requirements for sealing. When replacing the lubricating oil in the sealing chamber.

If the oil quality is turbid and the water content is high, 

it is necessary to replace or replace the sealing box or sealing ring as a whole to ensure its good sealing performance.

5. Drying motor: 

If the insulation resistance between the winding and the shell of the submersible pump is less than 0.5 megohm, the motor water should be removed.

Drying methods include external drying method, electric current drying method and combined drying method.

-The external drying method is to use the external heat source for treatment.

The common measures include: 

(1) Blowing hot air: 

     using the blower of electric heater (electric hair dryer can be used for small agricultural submersible pump) to blow hot air to achieve the drying treatment day.

(2) Bulb baking: 

     use several 200-watt bulbs to bake in an airtight box. Note that the baking temperature should not be too high and should be controlled below 125 ℃.

-Current drying: 

The three-phase winding of the motor can be connected in series or parallel according to the impedance of the submersible pump 

and the size of the power supply, and then a variable resistor can be connected to adjust the current to about 60% of the rated current value, and then power on for drying.

6. Ensure bearing lubrication: 

check and replace the skeleton oil seal and lithium base lubrication of the upper and lower end cover bearing chambers of the water-filled submersible pump Grease. 

In order to ensure that the bearing works under good lubrication for a long time.

7. Check the bearing: 

If the upper and lower bearings of the motor are worn or the gap is too large, it is necessary to replace the new bearing in time. 

The inspection method is as follows: 

-When the motor is running, it feels hard to rotate the rotor by hand, and it makes a "click" sound at the same time following the speed, 

which is a little astringent or torn off on the bearing raceway. 

-When rotating the rotor by hand, there are uncertain dead points and intermittent "thumping" noises, which are generally caused by damage to the ball rack, 

broken inner ring or broken ball. In case of the above conditions, the bearing must be replaced to avoid further damage.

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