QJB Submersible Mixer Wastewater Sludge Mixing and Flow Propeller

Introduction of QJB Submersible Mixer‌

‌The QJB Series is a versatile submersible solution engineered for diverse industrial needs. Depending on the process, it offers two configurations: the direct-drive "Mixed-Type" for turbulence and the gear-reduced "Low-Speed Propeller" for circulation. Available in Cast Iron (Casted) or Stainless Steel (Stamped) body options to suit various corrosive environments.

High-Speed Mixing Series‌

Ideal for wastewater treatment plant balancing tanks, nitrification/denitrification tanks, sludge treatment/storage tanks, and industrial processes involving liquid mixing with suspended solids. Effectively prevents sedimentation.

‌Low-Speed Propeller Series‌

• Suitable for industrial & municipal wastewater aeration tanks, anaerobic tanks, large-scale nitrification/denitrification tanks, disc-type activated sludge tanks, disinfection pools, and industrial mixing. Generates low-shear, open-channel strong water flow, enabling easy creation of:

Large-volume fluid circulation

• Nitrification/denitrification/phosphorus removal phase water flow

Model Designation Methods

‌Operating Conditions‌

• Maximum medium temperature‌: ≤40°C

• pH range of medium‌: 5–9

• Medium density‌: ≤1150 kg/m³

• Maximum submergence depth for continuous operation‌: ≤20 m

Structure of submersible mixer

The QJB submersible mixer is mainly composed of the mixer body, installation system and the electrical control equipment.

According to the function mode, the QJB submersible mixer can be divided into two categories: 1) Mixed-type submersible mixer (corresponding to the direct-connected submersible mixer); 2) Low-speed flow propeller submersible mixer (corresponding to the non-direct-connected submersible mixer).

According to the blade forming method, the QJB submersible mixer is further divided into two subcategories: 1) Casted mixer: The blades (impellers) are formed by casting, and the main body casing is made of cast iron; 2) Stamping mixer: The blades are formed by stamping, and the main body casing is made of stainless steel.

1.Mixed-type submersible mixer

As shown in Figure 1, the direct-connected submersible mixer is mainly composed of two parts: the impeller and the submersible motor, with the impeller directly mounted on the motor shaft. It is generally equipped with a jet ring (its function is to increase axial flow, reduce radial flow, reduce impeller vibration, and improve operation stability); while the low-speed flow propeller submersible mixer is not equipped with such a jet ring.

2.Low-speed flow propeller submersible mixer

As shown in Figure 2, the low-speed flow propeller submersible mixer is mainly composed of three parts: an impeller, a submersible motor, and a speed reduction device. The impeller is mounted on the output shaft of the speed reduction device.

Table 1 Main performance parameters of QJB submersible mixer

Table 2 Main performance parameters of low-speed submersible propeller

• Sewage/wastewater/sludge mixing & homogenization

• Thickening processes

• Sludge dewatering

• Heat transfer optimization

• Tank cleaning

• Preventing particle deposition on tank walls/bottoms

• Suspended solids removal

• Anti-icing

• Water flow generation

• Recirculation systems

Features

• Structure and Maintenance: Compact structure, small size, light weight, simple operation and maintenance, convenient installation and overhaul, and long service life.

• Impeller Design: The hydraulic design structure is optimized for high working efficiency; the backward-swept blades have a built-in self-cleaning function, which can prevent debris from winding and clogging.

• Energy Saving and Anti-Settling: When used in conjunction with an aeration system, energy consumption is significantly reduced, oxygen transfer efficiency is notably improved, and sedimentation is effectively prevented.

• Cable Sealing: The unique cable sealing design completely eliminates the risk of water leakage through the cable.

• Motor Protection: The motor windings feature Class F insulation with an IP68 protection rating. High-quality bearings with one-time lubrication and maintenance-free performance are adopted, equipped with oil chamber leakage detection and motor winding overheating protection functions to ensure safe and reliable operation of the motor.

• Mechanical Sealing: Two independent mechanical seals are used, with the friction pair made of corrosion-resistant tungsten carbide; all fasteners are made of stainless steel.

• Anti-Corrosion Technology: Standard components adopt electrolytic separation technology, which can effectively prevent corrosion.

Advantages

To ensure the best results, please provide the following information: 

• Purpose of use; 

• Tank shape; 

• Tank dimensions, including water depth; 

• Medium characteristics: including viscosity, density, temperature, solid content, etc. 

The matching power required for the mixer is determined according to the volume, tank size, density and viscosity of the stirring liquid. One or more mixers are used according to specific conditions. 

The QJB submersible mixer must work completely submerged in water and cannot work in flammable and explosive environments or environments with highly corrosive liquids! If users have special usage requirements, they can keep in touch with our technical engineering department to provide the best solution.