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QJ Deep Well Submersible Electric Pump with 5–1,500 m³/h Flow Range and 10–600 m Head Range for Vertical Multistage Water Extraction
Detail Information
Flow Range:
5–1,500 M³/h
Head Range:
10–600 M
Pumped Medium:
Clean Water
Installation Position:
Vertical Submerged Installation
Driving Method:
Submersible Electric Motor
Control Options:
Manual, Remote Or Automatic Control
Product Description
QJ Deep Well Submersible Electric Pump for Water Supply and Irrigation
The QJ Deep Well Submersible Electric Pump is designed for extracting and delivering clean water from deep wells, boreholes, reservoirs and other underground water sources.
With a wide flow range of 5–1,500 m³/h and a head range of 10–600 m, the QJ series can meet various water-transfer requirements, from agricultural irrigation and domestic water supply to industrial circulation and pressure-boosting systems.
The pump and submersible motor operate underwater as an integrated unit. Its vertical, multistage structure allows it to generate high pressure while requiring limited installation space above ground.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Name | QJ Deep Well Submersible Electric Pump |
| Pump Type | Vertical multistage deep-well submersible pump |
| Flow Range | 5–1,500 m³/h |
| Head Range | 10–600 m |
| Pumped Medium | Clean water |
| Installation Position | Vertical submerged installation |
| Driving Method | Submersible electric motor |
| Main Applications | Deep-well water extraction, irrigation, water supply, clean-water circulation and pressure boosting |
| Control Options | Manual, remote or automatic control |
| Customization | Available according to project requirements |
Final pump specifications depend on the selected model, well dimensions and actual operating conditions.
Product Features
- Wide Performance Range: Covers flow rates from 5 to 1,500 m³/h and heads from 10 to 600 m, suitable for both small water-supply projects and large-capacity deep-well pumping systems.
- High-Head Water Delivery: Multistage impeller design gradually increases water pressure, allowing delivery from deep wells and transport over long distances or to elevated storage facilities.
- Integrated Submersible Design: Pump and motor operate below water level as an integrated unit, eliminating need for separate pump room or long transmission shaft.
- Space-Saving Vertical Installation: Slim vertical structure suitable for installation inside deep wells and boreholes, occupying minimal surface space.
- Stable Water Supply: Provides continuous and stable clean-water delivery for irrigation, municipal supply, industrial systems and other water-management projects.
- Low Operating Noise: Underwater operation reduces noise compared with surface-mounted pumping systems.
- Suitable for Automatic Control: Can be connected to control cabinet, water-level sensor, pressure sensor, storage tank or variable-frequency drive for automatic operation.
- Flexible Project Configuration: Pump capacity, head, motor specification, cable length, control method and discharge connection can be selected according to project requirements.
Working Principle
The QJ deep-well submersible pump uses a vertical multistage centrifugal hydraulic structure. When the motor starts, it drives the pump shaft and impellers to rotate at high speed. Water enters through the pump inlet and passes through the impellers and guide vanes.
Each hydraulic stage increases the pressure of the water. After passing through the required number of stages, the water is discharged through the pump outlet and delivered to the surface through a rising pipe. Because the motor and pump operate below the water level, no suction pipe or priming procedure is required under normal installation conditions.
Typical Applications
- Deep-well and borehole water extraction
- Agricultural irrigation systems
- Farmland and greenhouse irrigation
- Sprinkler and drip-irrigation systems
- Municipal and rural water-supply systems
- Residential and commercial water supply
- Industrial clean-water circulation
- Factory process-water supply
- Clean-water pressure boosting
- Reservoir and storage-tank filling
- Livestock and farm water supply
- Landscape and garden irrigation
- Mining and construction-site clean-water supply
- Fire-water storage and supply systems
- Groundwater transfer projects
Advantages of a Deep-Well Submersible Pump
- Operates directly below the water level
- Does not normally require suction priming
- Can extract water from depths beyond the suction limit of a surface pump
- Vertical structure requires limited ground space
- Underwater operation helps reduce noise
- Multistage structure can generate high discharge pressure
- Can be integrated with automatic water-level or pressure-control systems
Pump Selection Guide
Correct pump selection is essential for achieving reliable performance and avoiding motor overload, insufficient flow or excessive energy consumption.
Please provide the following information when requesting a pump selection:
- Required flow rate in m³/h
- Required total head in metres
- Well depth
- Well casing or borehole diameter
- Static water level
- Dynamic water level during pumping
- Distance between the well and discharge point
- Vertical elevation difference
- Pipe diameter, length and material
- Water temperature
- Water quality and sand content
- Available power supply
- Required cable length
- Manual, automatic or variable-frequency control requirements
How to Calculate the Required Head
The required pump head is not equal to the well depth alone. A complete head calculation should normally include:
Total Head = Dynamic Water Level + Vertical Elevation + Required Outlet Pressure + Pipeline Friction Losses
For example, if water must be lifted from a deep well and then transported through a long pipeline to an elevated tank, both the vertical lifting height and the pipeline resistance must be included.
Accurate operating information helps ensure that the selected pump operates close to its recommended performance range.
Installation Recommendations
For safe and reliable operation:
- Install the pump vertically unless otherwise confirmed by the manufacturer
- Make sure the well diameter is suitable for the pump's outside diameter
- Keep the pump inlet sufficiently below the dynamic water level
- Avoid positioning the pump directly in mud or sediment at the bottom of the well
- Use a suitable rising pipe, cable and suspension arrangement
- Check the motor's direction of rotation before normal operation
- Secure the power cable to the rising pipe without excessive tension
- Install appropriate electrical and motor-protection devices
- Make sure the pump remains submerged during operation
- Flush or clean newly drilled wells before installing the pump
- Commissioning should be carried out by qualified personnel
Recommended Control and Protection Functions
A control cabinet can be configured with:
- Manual start and stop
- Automatic water-level control
- Constant-pressure control
- Variable-frequency speed control
- Dry-running protection
- Motor overload protection
- Phase-loss protection
- Phase-sequence protection
- Overvoltage and undervoltage protection
- Motor overheating protection
- Leakage protection
- High- and low-water-level alarms
- Remote monitoring and control
Available functions depend on the selected motor and control system.
Frequently Asked Questions
1. What is a QJ deep-well submersible electric pump?
A QJ deep-well submersible electric pump is a vertical pump designed to operate underwater inside a deep well or borehole. It is primarily used to extract clean groundwater and deliver it to irrigation, water-supply, circulation or pressure-boosting systems.
2. What are the available flow and head ranges?
The available flow range is 5–1,500 m³/h, and the head range is 10–600 m. The actual flow and head depend on the selected pump model, number of hydraulic stages, motor power and system conditions.
3. Is the pump suitable for deep wells?
Yes. The QJ series is specifically designed for deep-well and borehole water extraction. The selected pump diameter must be compatible with the internal diameter of the well casing.
4. Can the pump be used for agricultural irrigation?
Yes. It can supply water to farmland, greenhouses, storage ponds, sprinkler systems and drip-irrigation systems. The required flow and pressure should be calculated according to the irrigation area, pipe network and irrigation equipment.
5. Can the pump be used for pressure boosting?
Yes. High-head models can be used in clean-water pressure-boosting systems. The pump can also be combined with a pressure tank, pressure sensor, control cabinet or variable-frequency drive for automatic pressure regulation.
6. Can it pump sewage or water containing large solids?
No. The QJ deep-well pump is mainly intended for clean water. Water containing large solids, long fibres, sludge or other abrasive materials may block or damage the hydraulic components. If the water contains sand or other particles, please provide a water-quality analysis before selecting the pump.
7. Can the pump handle water containing sand?
A small amount of fine sand may be unavoidable in some wells, but excessive sand can cause rapid wear to the impellers, guide vanes and bearings. The well should be properly developed and cleaned before pump installation. Please provide the expected sand content so that suitability can be evaluated.
8. Can the pump run without water?
No. Dry running must be avoided. The pump and motor rely on the surrounding water for cooling, and some internal components may also depend on water for lubrication. Dry-running protection and water-level control are strongly recommended.
9. Does a deep-well pump require priming?
Normally, no. Because the pump inlet is submerged below the water level, the pump does not require the suction priming procedure commonly associated with surface-mounted centrifugal pumps.
10. How deep should the pump be installed?
The pump inlet must remain sufficiently below the dynamic water level during operation. However, the pump should not be placed directly at the bottom of the well, where sand and sediment may accumulate. The final installation depth should be determined according to the static water level, dynamic water level, well depth and pump model.
11. How do I choose the correct pump diameter?
The pump's maximum outside diameter must be smaller than the internal diameter of the well casing, with sufficient clearance for installation, cooling-water circulation and future removal. Please provide the actual internal diameter of the well rather than only the nominal casing size.
12. How is the required pump head calculated?
The required head includes the dynamic water level, vertical lifting height, required outlet pressure and friction losses in pipes, valves and fittings. Selecting a pump based only on well depth may result in incorrect performance.
13. Can the pump operate automatically?
Yes. It can work with float switches, water-level probes, pressure sensors, control cabinets and variable-frequency drives. The system can be configured for automatic start and stop, constant-pressure water supply, dry-running protection and remote control.
14. Can a variable-frequency drive be used?
A variable-frequency drive may be used when the motor and control system are suitable for frequency control. It can help regulate flow, maintain constant pressure and reduce the impact of frequent starts. The permitted frequency range and cooling conditions must be confirmed before operation.
15. Can several pumps be used in one water-supply system?
Yes. Multiple pumps can operate alternately, in parallel or as duty-and-standby units. This configuration can provide variable capacity and improve system reliability. The pipeline and control system must be designed for multi-pump operation.
16. What causes insufficient water flow?
Possible causes include: incorrect pump selection, excessive total head, falling groundwater level, blocked inlet or hydraulic components, incorrect motor rotation, low supply voltage, worn impellers or guide vanes, excessive pipe resistance, or leakage in the rising pipe. The actual cause should be determined through systematic inspection.
17. What information is required for a quotation?
Please provide: required flow and head, well depth and internal diameter, static and dynamic water levels, water quality and temperature, power-supply voltage and frequency, required cable length, installation and control requirements, and intended application. For replacement projects, please also send the existing pump nameplate, performance curve, installation drawing or clear product photos.
18. Can the pump be customized?
Yes. The pump model, hydraulic stages, motor specification, cable length, discharge connection and control system can be configured according to the project conditions. Customization must be confirmed through technical pump selection before production.
