Permanent magnet Submersible mixer QJBE

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Product details

Product Introduction

The submersible mixer was successfully developed by introducing the sealing technology of German submersible motors. After years of practical exploration, due to its innovations in form, structure and testing methods, the overall performance of the submersible mixer has reached the level of similar foreign products. The QJB submersible mixer can be divided into two major series: mixing and low-speed circulation. The mixed series of agitators are suitable for stirring liquids containing suspended solids in sewage treatment plants and industrial processes. The low-speed circulation series of agitators are suitable for aeration tanks in industrial and urban sewage treatment plants. They generate a strong low-tangential flow, which can be used for circulation and to create water flow in the nitrification, denitrification and phosphorus removal stages.

Scope of application

The mixer should be able to operate normally and continuously under the following conditions:

The maximum medium temperature shall not exceed 40°C.

The PH value of the medium is between 5 and 9.

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

It can operate underwater for a long time, and the general diving depth does not exceed 20 meters.

Key points to note

The submersible mixer must operate fully submerged in water. Do not work in an environment with flammable, explosive or strongly corrosive liquids. Steel expansion bolts must be fixed as required. After installation, the cables must be tightened and fixed properly.

When selecting a submersible propeller, if the diameter of the impeller exceeds 2 meters, it is recommended to use a gearbox reducer.

Performance features

Compact structure, simple operation and maintenance, convenient installation and inspection, and long service life.

The impeller features an optimal hydraulic design structure, with high working efficiency. The swept-back blades have a self-cleaning function, which can prevent entanglement and blockage by debris.

When used in combination with the aeration system, it can significantly reduce energy consumption, greatly increase the oxygenation capacity, and effectively prevent sedimentation.

The insulation class of the motor winding is F grade, and the protection class is IP68. High-quality bearings and motor anti-condensation devices are selected to make the motor operation safer.

Five mechanical seals;

Model representation method

Performance parameters

The mixer operates under the conditions of a rated voltage of 380V, a frequency of 50Hz, winding insulation class F, protection class IP68, and working system I.

Appearance of submersible mixer

Installation dimensions of the mixer:

Installation system (support frame is optional):

Selection considerations

The selection of submersible mixers is a rather complex task. The correctness of the selection directly affects the normal operation of the equipment. The principle of selection is to ensure that the mixer can fully exert its stirring function in a suitable volume, which can generally be determined by the flow rate. 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. Therefore, before selecting the model, it is necessary to first determine the application site of the submersible mixer, such as: sewage tank, sludge tank, biochemical tank; Secondly, there are the parameters of the medium, such as: suspended solids content, viscosity, temperature, and PH value; There are also the shape and depth of the pool, etc.

The required matching power of the agitator is determined by the volume size, the density of the liquid to be stirred and the stirring depth. One or more agitators are adopted according to the specific situation.

Mixed stirring type

1. Determine the sludge correction coefficient of the medium to be stirred according to Figure B1 or Table B1.

2. Determine the tank type correction coefficient of the stirring tank according to Figure B2 or Table B2.

Based on the power consumption of 5w per cubic meter of clear water, multiply it by the sludge correction factor and then by the tank type correction factor to obtain the actual power consumption per cubic meter of the medium to be mixed and stirred. Then multiply it by the volume of the medium to be stirred to get the power required for the entire tank of the medium to be mixed and stirred.

Low-speed circulation type

1. Determine the tank type correction coefficient of the stirring tank according to Figure B1 or Table B1.

2. Determine the sludge correction coefficient of the medium to be stirred according to Figure B2 or Table B2.

3. Based on the initial flow rate y of the stirring medium, determine the power consumption per unit flow rate through Figure B3.

The flow rate of the agitator is calculated by multiplying the initial flow velocity y of the stirred medium by the cross-sectional area formed when the impeller rotates.

The power required for the entire tank medium can be obtained by multiplying the flow rate of the agitator by the power consumption per unit flow rate, and then by the sludge correction factor and the tank type correction factor.

Table B1: Pool Type Correction Coefficient Table

Table B2: Sludge Correction Coefficient Table

Operating conditions

Mixing and stirring series

Low-speed circulation mixer series