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Product Introduction

Submersible propeller mixers, also known as low-speed propeller mixers or propeller agitators, are sewage stirring equipment with low rotational speed and large impellers, mostly used in hydraulic circulation. It is mainly composed of submersible motors, reduction devices, propellers, installation systems, etc., and is usually installed underwater by means of guide rods. The research and development of submersible mixers is based on the production technology of submersible mixers. Therefore, their production processes and performance characteristics share many similarities with those of submersible mixers. The main differences lie in that the rotational speed of submersible mixers is generally lower, usually ranging from 36 to 115r/min, and the diameter of the impeller is larger, typically between 1100 and 2500mm.

Product function

The flow field distribution of the submersible propeller is relatively uniform, with a low flow velocity, but it has a wide range of action. This type of product is suitable for treatment structures where there are no requirements for the GT value (coagulation stirring intensity value), the tank space is relatively large, and the purpose is to achieve hydraulic circulation and maintain flow rate. This type of equipment is widely used in the stirring of anaerobic tanks and the pushing flow of oxidation ditches in industrial and urban sewage treatment plants, generating low-speed tangential flow to create water flow conditions for nitrogen and phosphorus removal processes.

Operating conditions

To ensure the normal operation and process effect of the submersible propeller, please confirm whether the following working conditions are met:

The temperature of the processing medium shall not exceed 40 ° C

The density of the medium does not exceed 1150kg/m ³

The medium to be processed is non-flammable, non-explosive or strongly corrosive liquid (the pH value of the medium is preferably between 5 and 9)

The equipment operates submerged for a long time at a depth of less than 20 meters

Common shapes of submersible propellers

Structural features

The mainframe has a compact structure, is easy to install and maintain, simple to operate, and has a long service life. The impeller optimized based on "Computational Fluid Dynamics" (CFD) design has a high working efficiency, and the swept-back blades effectively prevent entanglement and blockage by debris

Pure copper motors have strong magnetic induction, high melting points, and an insulation grade of F, providing long-lasting and stable power. Imported NSK bearings and effective anti-condensation measures for the motor are selected to ensure the safety and stability of motor operation for a long time

Two mechanical seals strictly prevent leakage and ensure the safe operation of the motor

Product function

The selection of submersible mixers is rather complex. Whether the selection is correct directly affects the normal operation of the submersible mixer and the processing effect. The following steps can be referred to for selection :1. First, it is necessary to determine the purpose and application of the selected submersible mixer product, clarify whether the submersible mixer has other comprehensive functional requirements such as aeration, and the function of the water pool to which it is applied

Secondly, it is necessary to clearly define the shape, size and water inlet and outlet positions of the water tank where the submersible mixer is located, and understand the positions of obstacles in the tank (such as columns, pipes, aeration systems, etc.), so as to select an ideal installation location for the submersible mixer.

3. Determine the initial flow velocity of the medium in the tank or the average flow velocity, specific gravity, PH, specific gravity of solid sludge or the content of fibrous substances in the medium of the fluid in the tank, etc. According to the different process requirements of the sewage treatment plant, the optimal flow rate of the agitator should be maintained between 0.15 and 0.3m/s. If the flow rate is lower than 0.15m/s, the push-flow stirring effect cannot be achieved. If it exceeds 0.3m/s, it will affect the process effect and cause waste.

4. Subsequently, based on the pool shape, size, liquid depth, and the required process speed (average speed)Vm, etc., select appropriate criteria, calculate the total thrust F or power required to meet the Vm requirements, and then choose the appropriate agitator specification and model Make the thrust number of the mixer equal to or greater than the total thrust F. If one unit cannot meet the requirements, multiple units can be used to achieve this.