Well, submersible pump is composed of pump body, lifting pipe, pump base, submersible motor (including cable) and starting protection device. The pump body is the working part of the submersible pump, which consists of the water inlet section, the guide shell, the check valve, the pump shaft and the impeller.

There are two ways to fix the impeller on the shaft: the impellers of the 150QJ30, 200QJ80, 250QJ80 and QJC types are fastened on the pump shaft with a tapered sleeve; the impellers of other types are fixed on the pump shaft with a key and a shaft sleeve. superior. The guide shells are connected with bolts; the whole pump body of the 150QJT15 type is fastened with four flat ties. The pump body and the submersible motor are connected by bolts on the flange surface, and the two shafts are connected by couplings. The lift pipes are also connected by bolts.

The motor is a water-filled well submersible three-phase asynchronous motor that runs vertically, and the cable is waterproof rubber sheathed cable. The starting protection device should be a self-coupling decompression starting box with overload, undervoltage, and disconnection protection functions.

Working principle of submersible well pump

The impeller of the submersible pump is driven by the submersible motor to rotate, so that a vacuum is formed at the inlet of the impeller, water is sucked in, and the water generates centrifugal force under the action of the impeller blades, thereby obtaining speed energy and pressure energy. The water with a certain amount of energy passes through the guide casing and enters the impeller of the next stage. With the increase of pump stages, the pressure increases continuously, and finally it is sent into the pipeline system on the ground through the lift pipe and the pump base.

Installation of submersible pumps for wells

✔️Inspection and preparation before installation

1. Check whether the well conforms to the conditions of use of the pump, that is, the diameter of the well, the quality of the vertical and the good wall, as well as the static water level, dynamic water level, water inflow and water quality conditions.

1. Check whether the power supply equipment and power supply lines can ensure the normal operation of the electric pump.

1. Whether the power supply voltage and frequency meet the conditions of use.

1. Familiar with the installation and operation instructions, the newly drilled well must be flushed, and the submersible electric pump can be installed only after the mud and sand are removed from the water.

1. Check whether the electrical wiring, control and protection devices are reasonable, safe and reliable.

1. Prepare all kinds of installation and use tools, and erect tripods and slings (or other hoisting tools) to be safe, reliable and easy to use.

✔️When installing

1. Remove the water filter screen in one unit with the pump, and then open the water injection and air vent bolts to fill the inner cavity of the motor with clean water. Make sure to fill it up to prevent false full. And check all parts of the motor for water leakage. If water leakage is found, adjust the gasket and tighten the bolts according to the location.

1. Carefully check whether the cables and connectors are bumped or damaged, and wrap them up in time if any problems are found.

1. Use a 500-volt megohmmeter to measure the insulation resistance of the windings not less than 150 megohms.

1. Install the protection switch and starting equipment, and check whether the water in the motor is full. Tighten the water injection and air vent bolts, and then install the wire guard and water filter to prepare for installation.

1. Install a short water delivery pipe section at the water outlet of the pump, clamp it with a splint, lift it and drop it into the well, so that the splint is seated on the good platform.

1. Use a pair of splints to clamp another section of the water pipe, then lift and lower it to connect with the short water pipe flange. Lift the hoisting chain to remove the first pair of splints, so that the pump tube is lowered into the well and sits on the good platform, and the installation is repeated in sequence, and then goes down the well until all the installations are completed, and the last splint is not removed to fix the pump on the wellhead.

1. Finally put on the manhole cover, elbow, gate valve outlet pipe, etc.

1. Each time the flange is connected, a rubber pad should be added, and the fastening screws should be tightened in the direction of the dime at the same time after alignment to prevent skewed water leakage.

1. The cable should be fixed in the groove on the flange of the water delivery pipe, and each section should be fixed with a rope. Be careful during the process of going down the well. The cable cannot be used as a sling, let alone bump the cable.

1. There is a stuck phenomenon in the process of pumping down. It is necessary to overcome the stuck point and not force the pump to avoid being stuck.

1. When installing a pump in a large well, etc., it is strictly forbidden for personnel to go down.

1. The protection switch and starting equipment should be equipped with voltage, ammeter and indicator lights, and should be installed on the switchboard and placed in appropriate positions.

Conclusion

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