Products Description
The submersible mixer for an anoxic tank is one of the key pieces of equipment in the water treatment process. It can meet the process requirements for homogenization and the flow of solid-liquid two-phase and solid-liquid-gas three-phase mixtures in biochemical processes.
Submersible mixers for anoxic tanks often use multi-stage motors and adopt a direct-connected structure. Compared with traditional designs, they feature a compact structure, low energy consumption, high efficiency, and easy maintenance. The impeller is manufactured with high precision and generates large thrust. This series of products is suitable for applications that require solid-liquid or solid-liquid-gas mixing.
Main Structure
The submersible agitator can treat sewage, sludge, or backwash wastewater. The mixer can be raised and lowered for easy movement, and inspection or maintenance does not require personnel to enter the sewage tank. The guide rod bracket is an integral part of the mixer. The entire weight of the mixer rests on the bracket, which is designed to withstand the thrust generated during operation. The mixer can operate continuously while fully submerged.
Each submersible stirrer is designed as an integral unit with a sealed, submersible structure. All components of the mixer, including the motor, are capable of continuous underwater operation. The main components in contact with the liquid are made of stainless steel (SS304 or SS316) or other durable materials. The critical contact surfaces of the waterproof seal on the main body are machined and embedded with two sets of nitrile or fluorinated rubber O-rings.
Cables and Cable Seals
The motor is equipped with a cable featuring an anti-pull function, meeting industry standards and providing sufficient length to reach the junction box without splicing. Each cable has a separate inlet and is reliably sealed. The power cable is a multi-core cable, such as 4-core, 5-core, or 7-core, and each cable is sealed individually. The cable outer sheath is made of low-absorption, oil-resistant neoprene, and its mechanical flexibility can withstand the pressure at the cable entry point.
The cable entry seal is designed to prevent torque from compromising the waterproof seal, forming a reliable submersible seal. The seal is reusable and allows for convenient cable replacement.
Motor
The motor of the submersible mixer is a squirrel-cage induction motor installed in a waterproof housing with a protection rating of IP68. The insulation class of the stator windings is F (180°C) or optionally H class. The motor is designed for continuous operation while stirring media at 40°C and can be started multiple times per hour. To monitor the temperature of each phase winding, a thermal switch is installed in the stator windings and connected to the control cabinet.
Bearing
The motor shaft is continuous and uninterrupted, rotating on three grease-lubricated bearings. Bearings from NSK or SKF are used. The upper bearing is a single ball bearing for radial loads. The lower bearing assembly consists of a ball bearing to handle radial forces and a radial-thrust bearing to handle axial forces. The design life of all bearings is at least 100,000 hours.
Integrated Mechanical Seal
The submersible mixer is equipped with an integrated double mechanical seal, operating in an oil chamber that lubricates the sealing surfaces at a stable flow rate.
The outer mechanical seal is made of corrosion-resistant sintered tungsten carbide to prevent the process liquid from entering the oil chamber.
The inner mechanical seal is also made of corrosion-resistant sintered tungsten carbide to prevent the oil in the oil chamber from entering the motor.
The inner and outer seals operate independently. The shaft sealing system includes an oil chamber designed to prevent overfilling and allow room for oil expansion. Oil filling and inspection ports with leak-proof seals are accessible externally for easy maintenance.
Shaft
The propeller shaft is an extension of the motor shaft, made of stainless steel (e.g., S420). The propeller is fully isolated from the mixing medium.
Impeller
The impeller is made of SS304 or SS316 and features a hydraulically balanced, non-clogging design. It is suitable for handling conventional sewage, sludge, or backwash wastewater. The propeller may have two or three blades.
Protection
Each motor phase winding is connected to a thermal switch.
A water leakage sensor detects water in the stator chamber. If activated, the motor stops and an alarm is triggered.
A monitoring relay can be installed in the control cabinet to provide real-time monitoring of thermal and leakage signals.
Installation Kits
Guide rods and lifting crane are made of stainless steel 304.
The support can be adjusted every 10° horizontally from 0° to 180°.
Stainless steel 304 lifting chains, bolts, nuts, washers, rotating operating handles, and chemical anchor bolts are included.
Conditions of Use
To ensure normal operation, the submersible mixer should be used under the following conditions:
Stirring medium temperature: 0°C – 40°C
pH value: 5–9
Medium density: ≤1150 kg/m³
Maximum continuous submersion depth: ≤20 m
Note: The mixer must be fully submerged in water and must not operate in flammable, explosive, highly corrosive, or high-temperature environments.
How to Choose a Suitable Model
The principle of model selection is to ensure the mixer fully performs its mixing function within the required tank volume. The recommended flow rate in sewage treatment applications is 0.15–0.3 m/s:
Flow rate < 0.15 m/s: Plug-flow mixing effect cannot be achieved.
Flow rate > 0.3 m/s: Process performance may be affected, causing waste.
Before selecting a model, consider the following:
Tank type and location: e.g., sewage tank, sludge tank, or biochemical tank.
Medium parameters: suspended solids content, viscosity, temperature, pH, etc.
Tank geometry and depth, as well as installation method.
Energy-saving considerations, which affect future operating costs.
The required motor power is determined by the tank volume, liquid density, and mixing depth. One or more mixers may be used depending on the application.
For a simplified selection process, you can provide the following information to our engineers:
Tank volume
Voltage
Material requirements
Corrosiveness of the medium
Our engineers will recommend a suitable mixer model. We use process mathematical modeling confirmed by CFD simulations to assist in the qualified selection of mixers. CFD modeling examples are available upon request.
specification
|
Model |
Rated power(KW) |
Rated current(A) |
Blades diameter(mm) |
|
QJB0.37/6-220/3-960 |
0.37 |
1.3 |
220 |
|
QJB0.85/8-260/3-740 |
0.85 |
4 |
260 |
|
QJB1.5/6-260/3-960 |
1.5 |
4 |
260 |
|
QJB1.5/8-400/3-740 |
1.5 |
5.8 |
400 |
|
QJB2.5/8-400/3-740 |
2.5 |
9 |
400 |
|
QJB3/8-400/3-740 |
3 |
11 |
400 |
|
QJB4/6-400/3-960 |
4 |
12 |
400 |
|
QJB4/12-620/3-480 |
4 |
14.2 |
620 |
|
QJB5/12-620/3-480 |
5 |
18.2 |
620 |
|
QJB7.5/12-620/3-480 |
7.5 |
28 |
620 |
|
QJB10/12-620/3-480 |
10 |
32 |
620 |
|
QJB15/12-620/3-480 |
15 |
43 |
620 |
|
QJB18.5/12-620/3-480 |
18.5 |
51 |
620 |
|
QJB22/12-620/3-480 |
22 |
60 |
620 |
|
Model |
RPM |
Weight(kg) |
Force(N) |
|
QJB0.37/6-220/3-960 |
960 |
45 |
138 |
|
QJB0.85/8-260/3-740 |
740 |
55 |
180 |
|
QJB1.5/6-260/3-960 |
960 |
55 |
260 |
|
QJB1.5/8-400/3-740 |
740 |
100 |
600 |
|
QJB2.5/8-400/3-740 |
740 |
100 |
800 |
|
QJB3/8-400/3-740 |
740 |
100 |
920 |
|
QJB4/6-400/3-960 |
960 |
100 |
1200 |
|
QJB4/12-620/3-480 |
480 |
184 |
1400 |
|
QJB5/12-620/3-480 |
480 |
184 |
1800 |
|
QJB7.5/12-620/3-480 |
480 |
229 |
2600 |
|
QJB10/12-620/3-480 |
480 |
229 |
3300 |
|
QJB15/12-620/3-480 |
480 |
260 |
4000 |
|
QJB18.5/12-620/3-480 |
480 |
276 |
4400 |
|
QJB22/12-620/3-480 |
480 |
290 |
5300 |
Drawing
If the tank or pool has a limited manhole size (e.g., in a round tank), and you are unsure whether the mixer can be installed, you can check the required manhole dimensions for the submersible mixer. For example, for model QJB7.5/12-620/3-480, the manhole should be at least 1500 × 1500 mm.
Alternatively, you can send us your tank layout, and our engineers will create a drawing showing the submersible mixer installed, so you can verify the fit.
Installation methods
How to place submersible mixers in tanks, please see some common installation methods, we can also send you drawings of placement after knowing your tank size.
Application range
Submersible mixers are primarily used for mixing, stirring, and circulation in municipal and industrial sewage treatment processes. They can also be applied to the maintenance of landscape water environments. The rotation of the impeller generates water flow, improves water quality, increases oxygen content, and effectively prevents the deposition of suspended solids.
FAQ
Q: If I can't find the model in the specification table, can you customize it?
A: Yes. Just provide us with your requirements, such as voltage, RPM, and material, and we can customize it for you.
Q: How many units do I need for my project?
A: Please provide your tank dimensions or send us your tank layout, and we can advise you on the appropriate model and quantity.
Q: Can I get the catalog or operation manual?
A: Certainly. A detailed catalog or manual will be sent to you.
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