Selecting the right submersible mixer is a complex task; the correctness of the selection directly affects the normal operation of the equipment. The principle of selection is to ensure the mixer performs full agitation functions within an appropriate volume, usually determined by flow rate.
Application:
QJB modelDiving agitatorIt is divided into two main series: mixed stirring and low-speed plug flow.
The Mixed Series Agitators are suitable for mixing suspended liquid in wastewater treatment plants and industrial processes.
Low-speed impeller mixers are suitable for industrial and urban wastewater treatment plant aeration tanks, generating strong water currents with low tangential flow, which can be used to create water currents for circulation and stages such as nitrification, denitrification, and phosphorus removal.
FQJB Type Buoyant BuoyDiving mixer
The FQJB-type Submersible Mixing Pump with Buoyant Float is a modified version of the standard submersible mixing pump, enhanced with a stainless steel buoyant float. The specific model selection is implemented according to the QJB-type submersible mixing pump.
Application Scope:
The blender should be able to operate continuously under the following conditions:
1. Medium temperature not exceeding 40°C.
2. The medium's pH value is between 5~9.
3. Liquid density not exceeding 1150 kg/m³.
4. Long-term dive operations, with dive depths generally not exceeding 20 meters.
Key Points to Note:
Submersible mixers must be fully submerged in water during operation; they cannot be used in environments with flammable, explosive, or highly corrosive liquids. The steel expansion bolts must be securely fastened according to specifications, and the cables must be tightened and properly secured after installation.
The propellers of our submersible flow controllers are made entirely of polyurethane material, equipped with a bevel gear box reducer.
Performance Features:
1. Compact structure, simple operation and maintenance, easy installation and inspection, and long service life.
2. The impeller features a rational hydraulic design structure, with backward-tilted blades that have self-cleaning capabilities, preventing debris entanglement and blockage.
3. Blending with the aeration system can significantly reduce energy consumption, significantly increase oxygenation, and effectively prevent sedimentation.
4. Motor winding insulation grade: F, protection grade: IP68, equipped with NSK/SKF bearings. The motor can be optionally fitted with a condensation prevention device. The motor utilizes an over-temperature protection system for enhanced reliability.
5. Two mechanical seals; the seals are made of silicon carbide for sealing, with fluoroelastomer as the rubber material.
Model Representation Method:
Performance Parameters of Submersible Mixers:
The mixer operates at rated voltage 380V, frequency 50Hz, with F-grade winding insulation, IP68 protection rating, and under working mode I.
Installation Method and Dimensions
Diving MixersMultiple installation methods are available. Here, we offer more versatile options for selection. Dimensions can be referenced in the table below. Our company can also provide special designs according to customer requirements.
Submersible mixer, submersible flow director dimensions
Installation System & Dimensions
Submersible mixers can be installed in various ways. Below are some of the more common methods, with others also available. These installations allow for quick disassembly and assembly of the submersible mixer without draining the pool water, ensuring both speed and safety.
FQJB Type Buoyant Submerged Impeller Mixer Installation Site
Submersible mixers can also be installed with buoyant floats. The FQJB type buoyant submersible mixer is a modified version of the standard submersible mixer, featuring a stainless steel buoyant float. It is primarily suitable for locations with uneven, non-firm pool floors and where it is not convenient to install bridge structures. It is specifically designed for wastewater treatment plants, without discharge of modified wastewater or river treatment.
Selection Considerations:
Selecting a submersible mixer is a complex task, as the correctness of the selection directly affects the normal operation of the equipment. The principle of selection should be to ensure that the mixer operates efficiently within the appropriate volume, typically determined by flow rate. According to the different process requirements of wastewater treatment plants, the flow rate of the mixer should be maintained between 0.15~0.3 m/s. A flow rate below 0.15 m/s fails to achieve proper push flow mixing, while a flow rate above 0.3 m/s can impair process effectiveness and lead to waste. Therefore, before selecting, first determine the application site of the submersible mixer, such as a sewage pool, sludge pool, or biochemical pool. Next, consider the medium parameters like suspended solids content, viscosity, temperature, and pH. Also, take into account the pool shape and water depth.
The required matching power for a mixer is determined by the volume size, the density of the mixing liquid, and the mixing depth. A single mixer or multiple mixers are used based on the specific circumstances.
Blended Mixing Type:
1. Determine the sludge correction factor for the medium to be agitated based on Figure B1 or Table B1.
2. Determine the tank type correction coefficient for the mixing tank based on Figure B2 or Table B2.
3. Multiply the power consumption per cubic meter of clean water by 5 W, then by the sludge correction factor, and finally by the tank type correction factor to obtain the actual power consumption required per cubic meter of the medium to be mixed and agitated. Multiply this by the volume of the medium to be mixed, and you get the total power required for the entire tank's mixed and agitated medium.
Low-speed Turbulent Flow Type:
1. Determine the tank type correction coefficient for the mixing tank based on Figure B1 or Table B1.
2. Determine the sludge correction factor for the medium to be mixed based on Figure B2 or Table B2.
3. Determine the work consumed per unit flow based on the initial flow velocity y of the mixing medium, as indicated in Figure B3.
4. Calculate the flow rate of the agitator by multiplying the initial flow velocity of the stirring medium (y) by the cross-sectional area formed by the impeller as it rotates.
5. Multiply the flow rate of the mixer by the power consumption per unit flow, then by the sludge correction factor and the pond type correction factor to obtain the total power required for the entire pond medium.
Operating Conditions:
Compared to traditional vertical mixers, vertical mixers have a limited service range. For pools with large water volume and a high width-to-length ratio, multiple vertical mixers are required to achieve effective mixing. However, the QJB submersible mixer typically requires only 1-2 units to achieve the desired mixing effect. For open-air large pools, a bridge frame is needed to install vertical mixers, whereas submersible mixers do not require one.
The QJB type submersible mixer's advantage lies in its ability to generate different flow directions. Due to the varying installation positions of the mixer, multiple flow patterns can be achieved, thereby creating a better flow effect in the pool and eliminating dead mixing spots. The required matching power for the submersible mixer is determined based on the pool volume, medium density, viscosity, and depth of the mixing medium. Depending on the specific situation, one or more mixers should be selected.
To ensure energy-saving operation of the submersible mixer in different pool types, refer to the following typical installation forms.
