300QJR Deep Well Submersible Pump

This hot water pump adopts the motor made of 50W400 grade high quality cold rolled silicon steel, which is stamped by high speed punch press. It has the advantages of low stator iron loss and low self-heating. The motor winding is designed for hot water pump, high temperature resistance and anti-aging. The winding has water resistance, and adopts 3CR13 stainless steel blade shaft, high temperature resistant bushing and other high quality accessories to enable it to operate for a long time at high temperature, and can be used with frequency converter, so as to automatically adjust according to the amount of water used. This hot water pump is the ideal choice for your hot water equipment, which can operate stably and efficiently, providing you with a lasting hot water supply.

The product is a three-phase AC 380V (tolerance + / - 5%), 50HZ (tolerance + / - 1%) power supply submersible pump. With water quality requirements: water temperature is not higher than 20 °C; solid impurities content (mass ratio) is not more than 0.01%; PH value (pH) is 6.5-8.5; hydrogen sulfide content is not more than 1.5mg/L; chloride ion content is not more than 400mg/L. The electric pump adopts closed or water sealed wet structure, before use must be submersible motor inner cavity filled with clean water to prevent empty, and then tighten the water and air bolts, otherwise not to use. Its work should be completely immersed in water, immersion depth is not more than 70 meters, the distance between the bottom of the pump and the bottom of the well is not less than 3 meters. Well water inflow quantity should be able to meet the electric pump water output and continuous operation, the output water quantity should be controlled at 0.7-1.2 times of the rated flow. The well should be vertical, the electric pump can not be used horizontally or inclined, only vertically placed. The electric pump must be equipped with cables and external overload protection device as required. It is strictly prohibited to conduct no-load test under no water condition.

1, well submersible pump for clean water pump, prohibit the new well, pumping sediment and muddy water,

2, well water pump voltage grade of 380/50HZ, the use of other voltage grades of submersible motors need to be customized. The underground cable must use waterproof cable, must be equipped with starting equipment, such as distribution box, start not ready should have commonly used motor comprehensive protection function, such as short circuit overload protection, phase protection, undervoltage protection, grounding protection, idling protection, in case of abnormal conditions, the protection device should be timely action trip.

3, the installation and use of the pump must be reliably grounded, prohibit the push and pull switch when the hands and feet are wet, the installation and maintenance of the pump must be cut off the power supply, the use of the pump place to set up "to prevent electric shock" obvious signs:

4, down the well or before installation, the motor cavity must be filled with distilled water or non-corrosive clean cold boiling water, tighten the / water bolt, the pump on the ground test run, must be to the pump chamber water lubrication rubber bearings, instant start not more than a second, see whether the steering is the same as the steering instructions. When the pump is upright, pay attention to safety, prevent overturning injury.

5, strictly according to the provisions of the pump lift, flow range of use, to prevent low flow or high lift pumping force, the thrust bearing and other parts of the wear, the motor overload burned

6, after the pump down the well, the measurement of the motor to the ground insulation resistance should not be less than 100M, after the start to observe the voltage and current, check the motor winding insulation, whether in line with the requirements; pump storage location temperature if less than freezing point, should be dry the water in the motor cavity, prevent the motor cavity water ice damage caused by low temperature.

The pump part is mainly composed of pump shaft, impeller, shunt shell, rubber bearing, check valve body (optional) and other components. The motor part is mainly composed of base, pressure regulating diaphragm, thrust bearing, thrust plate, lower guide bearing seat, stator, rotor, upper guide bearing seat, sand discharging ring, water inlet section, lead cable and other components. The main characteristic of this product is that the motor is a water-cooled submersible three-phase asynchronous motor, and the motor cavity is filled with water to cool the motor and lubricate the bearing. The pressure regulating diaphragm at the bottom is used to adjust the expansion-contraction pressure difference in the body caused by the change of the temperature rise of the motor. In order to prevent the sand particles in the well water from entering the motor, two oil seals are installed at the upper end of the motor shaft extension, and a sand discharging ring is installed to form a sand discharging structure. In order to prevent the pump shaft from jumping when starting, the pump shaft and the motor shaft are connected together through a coupling, and a thrust bearing is installed at the bottom of the motor. The lubrication of the motor and the pump bearing is realized through water lubrication. The stator winding of the motor is made of high-quality well motor winding wire, with high insulation performance. The pump is designed by computer CAD, with simple structure and good technical performance.

(1)Preparation before installation:
1. Check whether the submersible pump meets the usage conditions and scope specifed in the manual.
2. Using a heavy obiect with a diameter equal to the maximum outer diameter of the submersible pump, measure whether the inneldiameter of the wellbore can fit the submersible pump, and measure whether the well depth meets the installation requirements.
3. Check whether the wellbore is clean and whether the well water is turbid. Never use a submersible electric pump to wash the welor pump mud and sand water to avoid premature damage to the submersible electric pump.
4. Check whether the position of the welhead installation clamp is suitable and whether it can withstand the qualty of the entire unit
5. Check if the submersible pump components are complete and installed properly according to the assembly diagram in the manualRemove the filter screen and rotate the coupling to see if it rotates flexibly
6. Unscrew the water screw and fillthe motor cavity with clean, non corrosive water (note. be sure to fil it up), then tighten the waterscrew. After 12 hours of water injection, the insulation resistance of the motor should not be less than 150M Q when measured witha 500V shaking table.
7. Cable joint, cut off a 120mm rubber sleeve from one end of the outgoing cable and the matching cable with an electrician's knifethen stagger the length of the three core wires in a stepped shape, peel off a 20mm copper core, scrape of the oxide layer on theoutside of the copper wire with a knife or sand cloth, and insert the two connected wire ends in palirs.After tying the layer tightly with fine copper wire, solder it thoroughly and firmly, and sand of any. burrs on the surface. Then, forthe three joints, use polyvester insulation tape to wrap them in a semi stacked manner for three lavers. Wrap the two ends of thewrapping layer tightywith nyion thread,and then use a semi stacked method to wrap the tape for three layers. Wrap the outellayer with high-pressure insulation tape for three layers. Finally, fold the threestrands together and repeatedly wrap them for fivelayers with high-pressure tape. Each layer must be tightly tied, and the interlayer joints must be tight and fimm to prevent water frompenetrating and damaging the insulation, After wrapping, soak in water at room temperature of 20 ’c for 12 hours, and measurethe insulation resistance with a shaking table, which should not be less than 100M Ω

The attached cable wiring process diagram is as follows:

8. Use a multimeter to check whether the three-phase wires are connected and whether the DC resistance is approximately balanced.
9. Check whether the circuit and transformer capacity are overloaded, and then connect the overload protection switch or starting equipment. See Table 2 for specific models, and thenPour a bucket of water into the water pump from the water pump outlet to lubricate the rubber bearings in the pump, and then place the submersible electric pump upright and steady.Start (no more than one second) and check whether the steering direction is consistent with the steering sign. If not, swap any two connectors of the three-phase cable.Then install the filter and prepare to go down the well. If used in special occasions (such as ditches, ditches, rivers, ponds, ponds, etc.), the electric pump must be reliably grounded.

(2)Installation equipment and tools:
1. One pair of lifting chains for more than two tons.
2. A tripod with a vertical height of no less than four meters.
3. Two hanging ropes (wire ropes) that can bear a weight of more than one ton (can bear the weight of a complete set of water pumps).
4. Install two pairs of clamps (splints).
5. Wrenches, hammers, screwdrivers, electrical tools and instruments, etc.

(3)Electric pump installation:
1. The installation diagram of the submersible electric pump is shown in Figure 2. The specific installation dimensions are shown in Table 3 "List of Installation Dimensions of the Submersible Electric Pump".

2. Submersible electric pumps with a head less than 30 meters can be hoisted directly into the well using hoses and wire ropes or other hemp ropes that can bear the full weight of the entire machine, water pipes, and water in the pipes.

3. Pumps with a head of more than 30 meters use steel pipes, and the installation sequence is as follows:
①Use a clamp to clamp the upper end of the water pump part (the motor and water pump have been connected at this time), lift it with a hanging chain, and slowly tie it into the well untilPut the clamp on the wellhead and remove the hanging chain.
② Use another pair of clamps to clamp a pipe, lift it with a hanging chain 15 cm away from the flange, and lower it slowly. Between pipe flange and pump flangePut the rubber pad in place and tighten the pipe and pump evenly with bolts, nuts and spring washers.
③ Lift the submersible pump slightly, remove the clamp on the upper end of the water pump, tie the cable firmly to the water pipe with a plastic tape, and slowly tie it down until The clamp is placed at the wellhead.
④Use the same method to tie all water pipes into the well.
⑤After the lead-out cable is connected to the control switch, it is connected to the three-phase power supply.

(4)Things to note during installation:
1. If a jamming phenomenon is found during the pumping process, turn or pull the water pipe to overcome the jamming point. If various measures still do not work, pleaseDo not force the pump down to avoid damage to the submersible electric pump and the well.
2. During installation, a rubber pad should be placed at the flange of each pipe and tightened evenly.
3. When the water pump is lowered into the well, it should be placed in the middle of the well pipe to prevent the pump from running against the well wall for a long time, causing the pump to vibrate and the motor to sweep and burn.
4. Determine the depth of the water pump to the bottom of the well according to the flowing sand and silt conditions of the well. Do not bury the pump in the mud. The distance from the water pump to the bottom of the well is generally not less than 3 meters (see Figure 2).
5. The water entry depth of the water pump should be no less than 1-1.5 meters from the dynamic water level to the water inlet node (see Figure 2). Otherwise, the water pump bearings may be easily damaged.
6. The lift of the water pump cannot be too low. Otherwise, a gate valve needs to be installed on the wellhead water pipeline to control the pump flow at the rated flow point to prevent the motor from being overloaded and burned out due to large flow rates.
7. When the water pump is running, the water output should be continuous and even, the current should be stable (under rated working conditions, generally no more than 10% of the rated current), and there should be no vibration or noise. If there is any abnormality, the machine should be stopped to find out the cause and eliminate it.
8. When installing, pay attention to the setting of the motor grounding wire (see Figure 2). When the water pipe is a steel pipe, lead it from the wellhead clamp; when the water pipe is a plastic pipe, lead it from the grounding mark of the electric pump.

 After installation of the underwater pump, it is necessary to recheck the insulation resistance and three-phase continuity of the switch, and check whether the connection between the instrument and the starting equipment is wrong. If there is no problem, you can start the test machine. After starting, observe whether the indication reading of each instrument is correct. If the rated voltage and current specified on the nameplate are exceeded, observe whether the pump has any noise or vibration. If everything is normal, it can be put into operation. Four hours after the first operation of the pump, it should be turned off and the thermal insulation resistance of the motor should be quickly tested, and its value should not be less than 0.5 megaohm. After stopping the pump, it should be restarted after an interval of five minutes to prevent the water column in the pipeline from completely reversing, resulting in the motor burning due to excessive current. After the pump is put into normal operation, in order to prolong its service life, it is necessary to check regularly whether the supply voltage, working current and insulation resistance are normal. If the following conditions are found, the machine should be stopped immediately to eliminate the fault:

1 the current exceeds 20% under the rated working condition.

2 the dynamic water level drops to the inlet section, resulting in intermittent drainage.

3 the underwater pump vibrates violently or emits huge noise.

4 the supply voltage is lower than 340 volts.

5 a fuse is burned.

6 the water pipe is damaged.

7 the thermal insulation resistance of the motor to the ground is less than 0.5 megaohm.

When disassembling the device, it is necessary to untie the cable bundle and remove the pipeline part and the line protection plate. Remove the drain bolt and exclude all water in the motor chamber. Remove the filter element and loosen the screw on the coupling fixed to the motor shaft. Unscrew the bolt connecting the water inlet section and the motor, and separate the pump and the motor (pay attention to placing the device horizontally when separating to prevent the bending of the pump shaft). The sequence of disassembling the pump is as follows: (see Figure 1) water inlet section, impeller, water inlet shell, impeller. Check the valve body, and use a special tool to loosen the cone sleeve fixed to the impeller when removing the impeller. In the process of disassembly, avoid bending the pump shaft and damaging various components. The disassembly process of the motor is as follows: (see Figure 1) put the motor on the platform, and remove the nuts on the screw (pull rod bolt), base, shaft head lock nut, thrust plate, key and lower guide rail - bearing seat, bolt, and then remove the rotor (be careful not to damage the wiring harness), and finally remove the connecting parts and upper guide bearing seat. Unit assembly: before assembly, the rust and dirt of each component should be cleaned, and the sealant should be coated on each mating surface and fastener, and then assembled in the opposite order of disassembly (the movement of the motor shaft after assembly is about one millimeter), after the assembly is completed, the coupling should be flexibly rotated, and then the filter element should be placed for testing. Each time the underwater electric pump has been used for one year, or less than one year but has been immersed for two years, it must be disassembled and inspected in accordance with Article 5 and replace the worn parts.

 1, put out the water in the motor cavity (especially in winter to prevent the motor from freezing), and tie the cable well.

 2, store in an indoor room without corrosive substances and gases, with a temperature below 40 °C.

 3, long-term use should pay attention to the rust prevention of submersible pumps.

01 Deep well water intake

02 High-rise water supply

03 mountain water supply 

04 tower water

05 Agricultural irrigation

06 garden irrigation

07 river water intake

08 domestic water