The 250QJB Deep Well Submersible Pump is a high-performance engineering solution designed for demanding water extraction environments. Featuring an advanced frequency conversion motor capable of stable operation between 1Hz and 50Hz, this series maximizes energy efficiency while significantly extending the operational lifespan of the equipment. Its specialized waterproof wire design and high-frequency impact-resistant windings ensure unmatched stability even under pulse peak voltage and high-temperature conditions.
Engineered for versatility, the 250QJB series is optimized for harsh water quality, supporting a wide range of flow rates and head heights. With a water-filled wet submersible motor design for superior cooling and lubrication, and a sophisticated sand-prevention structure, these pumps are the ideal choice for agricultural irrigation, high-rise water supply, and industrial deep-well intake, ensuring a continuous and reliable water flow in the most challenging geological conditions.
Detailed Parameters
| Power Supply | Three-phase AC 380V, 50HZ | Max Water Depth | 70 Meters |
|---|---|---|---|
| Water Temperature | Below 20 °C | PH Value Range | 6.5 - 8.5 |
| Impurity Content | ≤ 0.01% Solid Impurities | Chloride Ion Content | ≤ 400mg/L |
| Hydrogen Sulfide | ≤ 1.5mg/L | Motor Structure | Closed or Water Immersion |
| Cooling Method | Water-filled Wet Submersible | Installation Mode | Strictly Vertical |
Key Advantages
Superior Insulation
Utilizes special water-resistant conductors resistant to high-frequency impact and thermal aging for extreme durability.
Energy Efficient
Frequency conversion winding design reduces power consumption while prolonging the pump's service life.
Sand-Proof Design
Equipped with dual sand sealing rings and a discharging ring to prevent particles from entering the motor.
Precise Engineering
Designed via computer CAD to ensure a simple yet high-performance structure with excellent technical stability.
Adaptive Cooling
The motor cavity is filled with water to provide simultaneous cooling and bearing lubrication during operation.
Flexible Operation
Supports stable conversion operations within the 1HZ-50HZ frequency range for precise flow control.
Product Gallery
Management Platforms
Application Range
Ideal for deep well intake, mountain water supply, and large-scale agricultural irrigation systems.
Installation Guard
Comprehensive guides for vertical installation, including precise cable jointing and grounding.
Safety Protocols
Includes strict mandates for overload protection, short-circuit prevention, and idling safeguards.
Maintenance Logic
Scheduled inspections for insulation resistance (min 0.5MΩ) to ensure long-term reliability.
Component Quality
High-grade impellers, rubber bearings, and thrust plates designed for minimal wear and tear.
Storage Standards
Winterization protocols including cavity draining to prevent ice damage in freezing climates.
Investment Return Comparison
| Feature | Standard Submersible | 250QJB Frequency Series |
|---|---|---|
| Energy Cost | High (Fixed Speed) | Low (Variable Frequency) |
| Service Life | Average | Extended (Reduced Wear) |
| Operational Stability | Moderate | High (Pulse Resistant) |
| Maintenance Frequency | Frequent | Optimized / Low |
| Water Quality Adaptability | Basic Clean Water | Harsh/Special Environments |
Frequently Asked Questions
The frequency conversion design allows the motor to operate stably between 1HZ-50HZ, which significantly reduces energy consumption and minimizes mechanical stress, thereby prolonging the pump's service life.
No, this pump is designed for clean water. Pumping sediment or muddy water is strictly prohibited as it can cause premature damage. However, it does feature sand-sealing rings to protect the motor from minor particulates.
The pump must be installed strictly vertically. It must be fully immersed in water (not exceeding 70m depth) before starting; no-load test runs are strictly prohibited to avoid bearing damage.
To prevent ice damage, all water must be discharged from the motor cavity before storage. Store the unit in a dry environment below 40°C and protect it from corrosive gases.
Immediately shut down the machine to investigate. Potential causes include the pump running against the well wall, insufficient water levels at the inlet, or internal mechanical wear.
Upon installation, the insulation resistance should not be less than 100MΩ. After the first four hours of operation, the thermal insulation resistance should be tested and should not be lower than 0.5MΩ.
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