QJB-W4/6 Submersible Recirculation Pump Q: 500 Cubic Meters H: 1.2 Meters

Motor Power: 4 kW

Motor Grade 6

Impeller diameter: 400mm

Recirculation pump structural description:

（1Cable entry seal

The cable entry seal is a complete unit with a fixed plate. The cable entrance is strictly ensured for waterproof and潜水sealing.

（2Motor

Three-phase squirrel cage induction motor, with shell design, air-filled inside, for direct start-up. The motor can continuously stir. 40Medium temperature, per hourPlease provide the Chinese content to be translated into American English.Large startup times 15 The intervals between each startup are evenly distributed.

The motor design can accommodate voltage fluctuations of ±5Provide its rated output within % range. As long as the motor does not overheat and has not reached full load continuous operation, ±10The rated voltage error of % is also acceptable. The motor allows for a certain degree of phase voltage imbalance in2Within %. The stator is cooled by the surrounding liquid. Cable diameter is greater than.1．5mm2 Connect thermal switch and optional protective sensor; cable sheath resists sewage corrosion.

（3Mechanical Seal

Recirculation pumpEquipped with two independent mechanical sealing systems. Sealing elements operate within the oil chamber, lubricating the sealing surface at a constant rate using liquid power. The external primary sealing component is located between the agitated liquid and the oil chamber, featuring a stationary and positively driven rotating tungsten carbide ring. The internal secondary seal is situated between the oil chamber and the motor housing, containing a stationary tungsten carbide ring and a positively driven rotating tungsten carbide ring. Only the external sealing surface comes into contact with the agitated medium. Each sealing interface is secured by a spring system. The sealing does not require maintenance, adjustment, or rotation direction adjustment. The oil chamber is filled with paraffin-type white oil, which does not contain aromatic hydrocarbons.

（4Bearings

Impeller shaft and motor shaft are an integrated unit.,The motor features two full-sealed deep groove ball bearings internally. The main bearings are single-row spherical roller bearings to bear the axial load, with a service life of not less than10 10,000 hours.

（5Oil Chamber

Oil serves as a lubricant and coolant for the seals, and also acts as an additional barrier against infiltrated liquids. The pressure accumulated in the oil chamber is mitigated through a volume of internal space.

（6Propeller Blade

The impeller is three-blade design, with wide blades, thin sides, smooth surface, and a swept-back configuration. This self-cleaning feature ensures the efficient and clog-free operation of the mixer.

（7Protect

1)All motor windings are connected to thermal switches, which are串联, and the thermal switches are equipped with...

125At °C, the motor stops rotating and an alarm sounds.

2)The motor room is equipped with humidity sensors, providing an alarm monitor for over-temperature and humidity limits for each sludge recirculation pump. In the event of temperature and humidity exceeding limits, the control circuit immediately stops the sludge recirculation pump to protect the motor, with the alarm monitor located in the electrical control cabinet.

（8Impeller shaft

The impeller shaft and the motor shaft are the same shaft, ensuring smooth and high-efficiency operation of the motor.

（9Cooling System

The motor can be adequately cooled by the surrounding liquid that is stirred.

Recirculation pumpProcess Conditions：

Installation Location: Aeration Zone, Bio-reactor Underwater Medium: Wastewater within the Bio-reactor

Medium Temperature:8～35Medium temperaturePH：5～9

Ambient Temperature:-10℃～45℃

Work Mode: Submerged intermittent operation or24h/d Continuous Operation

Recirculating sludge pump supply scope

All components, devices, accessories, matching equipment, and material specifications, materials, power ratings, performance curves, etc., for Jiangsu Du'an Environmental Protection Recirculation Pumps, are listed individually in the technical agreement and after-sales service quotation sheets.

The scope of supply should include the complete set of equipment for the normal operation of submersible pumps. This encompasses each unit of submersible sludge pump along with the necessary components for installation such as coupling bases, pump guides, lifting chains, pump discharge connections, bolt fasteners, submersible cables, etc., as well as replacement parts to ensure normal operation within the warranty period. Suppliers must also consider that different submersible centrifugal pumps are suited for various working applications and require specific pump features and auxiliary parts.

Jiangsu Du'an Environmental Protection is responsible for the supply of operation and installation of return sludge pump, necessary auxiliary systems, including all accessories, and is in charge of installation until normal operation.