Overview of the QJB-W Submersible Sludge Recirculation Pump:

The QJB‑W series sludge recirculation pumps are a new product developed on the basis of submersible mixer manufacturing technology. These pumps are specialized equipment for mixed‑liquor recirculation and denitrification in secondary wastewater treatment plants, and can also be used for pumping clarified water in surface water supply and drainage systems; for irrigation and control of waterway systems; and in wastewater treatment processes where low head and high flow rates are required in recirculation or sludge‑pumping circuits.

Operating Conditions for the QJB-W Submersible Sludge Recirculation Pump

1. During continuous operation, the medium temperature shall not exceed 40°C.

2. The medium’s pH is 6–9.

3. Diving depth: 10 m. Scope of product application;

Product Features of the QJB-W Submersible Sludge Recirculation Pump

1. Specifically designed for low head and high flow, with high efficiency;

2. Specifically designed for resistance to clogging and entanglement, ensuring reliable operation;

3. The use of sealing materials enables the pump to operate safely and continuously for more than 10,000 hours.

4. Compact structure; easy installation and maintenance.

5. The host unit features a stamped‑steel structure, offering a compact footprint, high precision, corrosion resistance, and quiet operation.

6. The product is equipped with protective and alarm devices for leakage current, water leakage, and motor overload, ensuring its safety and reliability.

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Introduction to the Structure of the QJB-W Submersible Sludge Recirculation Pump

Specially designed components and spare parts ensure the sludge recirculation pump delivers stable performance.

1. Cables: The cables are made of special water-tight materials;

2. Junction Box: The junction box is fully enclosed and isolated from the surrounding liquid and the stator housing.

3. Motor: 50 Hz squirrel-cage three-phase submersible induction motor, Class F insulation, IP68 protection rating, with the motor cooled by the surrounding medium.

4. Shaft: The motor shaft is made of stainless steel, and the rotor undergoes dynamic balancing tests.

5. Sealing: Static seals are O-rings, and shaft seals are mechanical seals, isolating the oil chamber from the surrounding medium.

6. Bearings: Equipped with imported bearings, designed for a service life of over 1,000 hours.

7. Oil Chamber: The oil is used to lubricate and cool the similar‑type seals and friction surfaces, while also isolating the permeate.

8. Impeller: The impeller features three blades that are wide and thin, with smooth, swept-back surfaces, enabling high efficiency, drag-free operation, and self-cleaning capabilities.

9. Inlet conical tube: The purpose of the inlet conical tube is to establish a favorable flow regime.

10. Drain fitting: The drain fitting is used to secure the inlet tapered pipe to the outlet pipe.

11. Guiding Device: The guiding device consists of two tubes (catheters) and an upper catheter clamp.