ZJQ Submersible sand pump manual
Feature
1. Large flow and low lift, the wide application range
2. High efficiency, High Anti-abrasive
3. Work under the water, low noise
4. Simple installation
5. Unique bearing and mechanical sealing
Overview
ZJQ submersible sand pump has been comprehensively optimized and innovatively designed in the hydraulic model, sealing technology, mechanical structure, and protection control. The product has a simple structure, convenient installation, safe and reliable use, and long service life. The pump does not need to build a complex ground pump room and fixtures, no noise and vibration, and the site is tidier.
Main usage
This product is suitable for conveying abrasives containing abrasive particles such as sand, cinder, and tailings. It is mainly used in metallurgy, mining, electric power, chemical industry, environmental protection, river dredging, sand pumping, municipal engineering, and other industries. This product is easy to install and move, has high slag extraction efficiency, and can operate safely under severe working conditions for a long time. It is an ideal product to replace the traditional vertical submerged pump and submersible sewage pump.
The Model name’s meaning
Conditions of Use
1.380v voltage, 3 phases, frequency 50hz ( can be customized voltage and frequency )
2. The liquids temperature is under 60℃， PH4-10, Density ≤1300kg/m³
3. Adapted to strong abrasive solid particles and mildly corrosive sewage slurry
4. The diameter of the solids in the medium is not more than 80% of the minimum runner pipe size of the pump
Product structure description
1. Signal line
2. Motor wiring
3. Junction Box
4. Motor cover
5. Bearing
6. Upper shaft base
7. Motor shell
8. Stator
9. Axis
10. Bearing
11. Oil-water probe
12. Oil room
13. Machinery Seal
14. Guard plate
15. Outlet flange
16. Support frame
17. Pump body
18. Impeller
19. Base filter
20. Agitator
Structure description
1. Pump body and impeller
Based on the actual test, carefully select and match the pump body and impeller. The pump body impeller adopts high-chromium wear-resistant material, which has good over-flow, high efficiency, flat power curve, is not easy to overload, accurate impeller balance, and stable vibration and small operation.
2. Agitator
The mixing wheel is located at the bottom of the pump. It can stir the sludge deposited on the bottom of the water into a turbulent flow and extract it. It collects diving, stirring, blowing sand, and pumping sand. The sand absorption efficiency is high and the dredging is more thorough.
3. Motor
Specially designed submersible motor, IPX8 protection, F-class insulation allows temperature rise, under normal temperature rise conditions, motor insulation life is long, while the submersible cooling effect is good, the actual temperature rise is low, motor insulation life is longer
4. Motor cooling
The heat of the motor is dissipated through the casing, and the medium can be reliably and safely operated as long as the medium is submerged. The more submerged, the more favorable the motor is.
5. Shaft seal
The motor shaft seal adopts two independent mechanical seals in series to form two reliable sealing lines. In the pumped medium, the sealing surface is pressed tighter with the pressure of the medium to effectively prevent water from entering the oil chamber. In the oil compartment,
prevent oil from entering the motor. If the first pass fails (its operating conditions are worse than the second pass), the second pass prevents oil from entering the motor. The bellows-type machine seal cooperates with the innovative structural cavity to further improve the reliability of the shaft seal. Under normal use, the trouble-free running time exceeds 8000 hours.
6. Oil chamber
The oil chamber is a barrier to prevent the medium from entering the motor from the pump shaft, preventing the medium from penetrating into the electrode. If the first machine seal leaks, the oil chamber buffer medium cannot directly enter the motor. At the same time, the two independent machine sealing friction surfaces are lubricated and cooled, which makes the machine seal work more reliable. Except that it can take away the heat of the bearing and some heat of the motor.
7. Bearing
The lower double-row angular contact bearing has a strong bearing capacity, and the upper deep groove bearing constitutes the reliable support of the motor water pump shaft, and has a large bearing capacity for the radial, axial force, and other forces generated when the sewage pump works, ensuring the unit Smooth operation and long life
8. Cable and its seal
1)The cable is a heavy-duty rubber flexible cable with anti-sewage. The cable core section is designed for long-term reliable operation under the ambient temperature of 40 °C and the full load of the motor. If the blower is working, the motor runs under non-full load power or below 40 °C. Life expectancy will be longer.
2)The cable rubber sleeve and the motor gland are sealed and pressed to prevent the medium from penetrating into the motor cavity from the cable and motor cover interface.
3)There is rubber vulcanization between the cable sleeve and the core. Once the rubber jacket is cut, it can effectively prevent the medium from entering the motor from the cable sleeve.
9. Motor Housing
The casing, the upper-end cover, the gland, and the like form a motor casing, and each part has a reliable static seal at the joint and joint, and each of them undergoes a strict hydraulic test to ensure that no leakage is ensured.
10. Safety protection inside the pump (acting through a dedicated electric control cabinet)
1）Oil-water probe: installed in the oil chamber to detect the leakage of the first machine seal (in the medium). When the leakage medium reaches the oil chamber, it will give an alarm signal when it reaches a certain proportion.
2）Float switch: Installed in the motor cavity to detect the second seal. When the oil (oil-water mixture) enters the motor, the float switch will send an alarm signal and stop working
3）Thermal signal: Installed in the stator winding of the motor. If the motor is overloaded for a long time, the motor winding temperature (or other reason the motor winding heats up) reaches a certain value, an alarm signal is issued and stops working.
11. External control system
The supporting special electric control cabinet can process various signals in the pump to realize functions such as control, protection, sound and light alarm, and various automatic control of single pump and multi-pump.
When the user owns the electric control cabinet, he should contact the professional control cabinet of our company to guide the user to install the protection controller in the self-provided electric control cabinet.
12. Optional
Forced cooling system. A metal sleeve is added to the motor casing to introduce a cooling water circulation to achieve forced cooling.
13. Performance curve and main parameters
The actual portion of the curve on the performance graph indicates the recommended range of use for the pump. The shaft power of the pump rises as the flow rate increases. If the flow rate of the pump exceeds the rated flow limit, the shaft power will exceed the rated power of the motor. When the medium temperature is high or the motor is not sufficiently cooled, the motor cannot work for a long time. If the flow rate is less than the rated flow limit, the shaft power of the pump is much lower than the rated power of the motor, and the efficiency of the unit is very low. It is very uneconomical to use the pump under such conditions.
Pump usage and precautions
1. Before the trial, carefully check whether the cable is damaged, whether the fastener is loose or falling off, whether the pump is deformed or damaged during transportation, storage and installation.
2. Use 500V megger to measure the same or relative ground insulation resistance of the electric
pump motor, the value should be no less than 2 megohms, otherwise the stator winding of the motor should be dried. The temperature of the drying process is not allowed to exceed 120 °C.
3. When the pump is turned on, the direction of rotation is counterclockwise from the water inlet. If the motor is reversed, just adjust any two wires in the cable to the wiring position.
4. The ground wire of the casing of the electric pump must be strictly in accordance with the relevant regulations. In order to ensure the personal safety during use, the installation personnel are strictly prohibited from launching water in the vicinity when the electric pump is running.
5. The electric pump must be equipped with automatic pump control without special circumstances. Do not connect the power grid directly or use the knife switch to turn on the power to ensure the normal operation of the pump.
6. Do not operate the pump for a long period of time with low lift (usually the head is not lower than 60% of the rated head). It is best to control it within the recommended head range to prevent the motor from burning out the motor due to overload.
7. The pump without a self-circulating cooling device is forbidden to be exposed to the water surface for a long time to prevent the electric pump from overheating.
8. The pump is equipped with a variable frequency speed control device, which is suitable for a wider range of working conditions.
Maintenance
1. Insufficient flow or no water
1) Reason: Motor reversal Solution: Correct motor steering
2)Reason: Impeller flow path or pipe blockage
Solution: To remove debris from the impeller or pipe, it is best to place a filter around the pump (but not at the pump inlet)
3)Reason: The lift of the device is too high, or the lift of the selected pump is much lower than the actual need.
Solution: Try to lower the lift (such as changing large diameter tubes or smooth tubes, reducing the number of bends, or increasing the radius of the elbow) or switching to a higher lift pump
4)Reason: impeller Heavy worn
Solution: Replace it with a new impeller
5)Reason: The liquid level is too low, causing the pump to draw in air
Solution: Adjust the position of the float switch so that the minimum liquid level meets the installation size requirements
6) Reason: Check valve direction reversed Solution: correct the valve direction
2. pump not work
1)Reason: lack of phase power
Solution: Check the line to eliminate the lack of phase
2)Reason: Impeller stuck
Solution: To remove debris from the impeller or pipe, it is best to place a filter around the pump (but not at the pump inlet)
3)Reason: Winding connector or cable break Solution: Repair with an ohmmeter
4)Reason: Stator winding burnout
Solution: Repair and replace the winding or stator
5)Reason: Control electrical failure
Solution: Check the control cabinet, repair or exchange electrical parts
6)Reason: low voltage
Solution: Symptomatic solution to the problem of power supply voltage
3. Stator burnout
1)Reason: In the absence of protection control appliances, the phase loss operation or phase loss state starts, the impeller is stuck or detached, the medium concentration is large, and the cooling system is blocked.
Solution: After repairing the motor, the protective control device must be configured and the circuit must be cleaned before use to clear the phase loss and remove dirt. Tighten the impeller to tighten the impeller screw and the stainless steel spring washer; dilute the medium with water, rinse, and clear the cooling system.
2) Reason: Seal damage, water comes into the motor Solution: Replace mechanical seal or O-ring seal
3) Reason: Loose fasteners cause water comes into the motor Solution: Tighten the fasteners
4)Reason: The motor runs out of water for a long time
Solution: Ensure that the minimum liquid level is not lower than the installation size chart
4. Overcurrent
1)Reason: Pumping liquid has a higher density or viscosity
Solution: Change the liquid’s density or viscosity of the liquid or change the pump
2)Reason: The lift of the selected pump greatly exceeds the actual needs or the conditions of use change, the lift of the device is greatly reduced so that the pump exceeds the recommended flow.
Solution: Close small outlet valve, reduce flow, or change to the small impeller, or replace the pump with lower lift
3)Reason: Bearing broken Solution: replace new bearing
4)Reason: There is debris between the impeller and the pump body Solution: Remove debris
5)Reason: Power supply voltage is too low
Solution: Symptomatic solution to the problem of power supply voltage
5. Vibration, loud noise
1)Reason: The lift of the selected pump greatly exceeds the actual needs, or the use conditions change, the lift of the device is greatly reduced so that the pump exceeds the recommended flow rate.
Solution: Close the small outlet valve, reduce the flow, or use the small impeller
2)Reason: The liquid level is too low, causing air to be drawn in
Solution: Adjust the position of the float switch so that the minimum liquid level meets the installation size requirements
3)Reason: If the pipeline is improperly installed, such as close to the pump outlet and closing the valve, close the pump outlet and install the elbow. The diameter of the discharge pipe close to the pump outlet is suddenly reduced. The suction diameter of the installed pump is smaller than the elbow inlet’ caliber
Solution: Check the specific problem of the pipeline set to solve the problem
4)Reason: Bearing lack of grease or damage
Solution: Add grease for bearing or replace a new one
5)Reason: There is something stuck between the impeller and the pump body (with an increase in current)
Solution: Remove debris
