Discussion on maintenance technology of submersible pump for well

Structure and working principle of submersible pump for well

Structure of submersible pump for 1.1 well

Well submersible pumps are used by the pump body, Yang pipe, pump seat, submersible motor (including the cable) and the

Dynamic protection device and other components. The pump body is a working part of the submersible pump, which is composed of a water inlet section, a guide shell, a check valve, a pump shaft and an impeller. There are two ways to fix the shaft of the impeller: 150QJ30,

200QJ80, 250QJ80 and QJC type impeller is taper sleeve is fastened on the pump shaft; other types of impeller with keys and a shaft sleeve is fixed on the pump shaft. Bolt connection between diversion shell

The entire pump body of the 150QJT15 type is fixed with four flat steel bars. Between the pump and the submersible motor with flange bolt connection, two axis is connected with the coupling. Also lifting pipes connected by bolts.

Motor for vertical movement of water filling well submersible three-phase asynchronous motors, with the cable waterproof rubber sheathed cable, starting protection device should be used with overload, undervoltage, broken equal protection function of lotus root decompression starter box.

1.2 well submersible pump working principle

The impeller of the submersible pump driven by the submersible motor rotates to form a vacuum at the inlet of the impeller, the water is sucked in, and the water is generated under the action of the impeller blade to obtain the centrifugal force, thereby obtaining the speed and the pressure energy. With a certain energy of water through the diversion shell, into the next level of the impeller, with the increase of pump series, the pressure is increasing, and finally through the pipe and pump seat into the pipeline system in the ground.

Two, the installation of submersible pump wells

Inspection and preparation before 2.1. installation:

(1) inspection wells is in line with the conditions of use for the pump well diameter, vertical and wellbore quality and static water level, water level, water inflow and water quality conditions and, if not in line with the conditions must be used to take corresponding measures, otherwise can't pump wells.

(2) check the power supply equipment and power lines can ensure the normal operation of the pump.

(3) the power supply voltage and frequency are in compliance with the conditions of use.

(4) familiar with the installation instructions, of newly drilled wells must be well washing and removal of mud and sand, can install submersible pump.

(5) check the electrical circuit, control and protection device is reasonable and safe and reliable.

(6) for all the good installation and use tools, erect triangular frame and a chain (or other lifting tools) to safety, reliable, easy to use.

2.2. installation

(1) of the pump body discharge under the strainer, and then open the water injection and gas hole bolt to the motor cavity is filled with clean water, make sure fill, prevent false full. And check whether the motor is leaking. That should be adjusted according to the site Water Leakage plastic pad bolt.

(2) carefully check the cables and connectors are bruised or damaged, found problems in a timely manner.

(3) 500 volt megohm table determination of insulation resistance of not less than 150 megohm winding.

(4) installed protection switch and starting equipment, and check the motor internal water is filled, tighten the water injection, a vent hole bolt, and good protecting wire plate, a water strainer to install wells.

(5) a short pipe section in the installation of the pump outlet, and a splint to lift the splint falls into the well, located in jingtai.

(6) and a pair of clamping plates of another section of the water pipe, and then lift the lower flange is connected with short pipes. Rising chain split first pay plywood, to make the pump down wells and is located in Jingtai, successively repeated installation, well, until all of the Bahrain, finally, a splint are not discharged will pump is fixed on the wellhead.

(7) finally put on the cover, pipe, valve outlet pipe etc..

(8) to pad each connecting flange, on the rear fastening screws to tighten the diagonal direction at the same time, to prevent Water Leakage skew.

(9) cables to fixed in conveying pipe flange groove, each section with fixed rope tied, well to be careful, cable can not be when using a sling, more not to bruise cable.

(10) under the pump process has stuck phenomenon, to overcome the card point, can not force the pump, so as not to die.

(11) personnel under wells wells pump installation is prohibited.

(12) the protection switch and starting equipment shall be equipped with voltage, current meter, indicator light, and installed on the distribution panel, placed in the appropriate location.