Product Overview
QJB Submersible Mixer is a direct-drive submersible mixing unit designed for continuous agitation and flow circulation in wastewater treatment basins.
It resolves sludge sedimentation, dead zones and insufficient hydraulic circulation in biological and equalization tanks.
It is suitable for municipal sewage tanks, oxidation ditches, anaerobic/anoxic basins and industrial wastewater mixing processes.
Model Designation
Applications
- Biological aeration tank internal circulation
- Anoxic and anaerobic tank sludge suspension
- Equalization basin flow homogenization
- Industrial wastewater reaction tank mixing
- Sludge holding tank anti-settling operation
Engineering Advantages
- Direct-connected submersible motor eliminates transmission loss and improves torque efficiency.
- Swept-back impeller blade design generates axial thrust flow for wide-area circulation.
- Low-speed high-thrust configuration prevents sludge deposition without excessive turbulence.
- Fully submerged operation reduces noise and structural vibration transmission.
System Components
QJB Submersible Mixer mainly consists of:
- Submersible motor
- Mixing impeller
- Mechanical seal system
- Guide rail & lifting bracket system
- Motor housing
- Power cable assembly
Technical Specifications
Service Conditions
Suitable for long-term submerged mixing in municipal and industrial wastewater treatment facilities.
Operating Conditions
- Flow Thrust: 0.163 – 3.3 kN (163 – 3300 N)
- Power Range: 0.85 – 10 kW
- Speed: 480 – 980 rpm
- Liquid Temperature: ≤ 40°C
- Working Depth: ≤ 20 m
Detailed parameter tables are provided below.
Specifications & Installation
Outline Drawing
Performance Parameters
| QJB Submersible Mixer — performance data at rated voltage 380 V and frequency 50 Hz are shown in the table below: | ||||||
| Model | Motor Power | Rated Current | Impeller Speed | Impeller Diameter | Thrust | Weight |
| kW | A | r/min | mm | N | kg | |
| QJB0.85/8-260/3-740/S | 0.85 | 3.2 | 740 | 260 | 163 | 55/65 |
| QJB1.5/6-260/3-980/S | 1.5 | 4 | 980 | 260 | 290 | 55/65 |
| QJB2.2/8-320/3-740/S | 2.2 | 5.9 | 740 | 320 | 582 | 88/93 |
| QJB4/6-320/3-960/S | 4 | 10.3 | 960 | 320 | 609 | 88/93 |
| QJB1.5/8-400/3-740/S | 1.5 | 5.2 | 740 | 400 | 600 | 74/82 |
| QJB2.5/8-400/3-740/S | 2.5 | 7 | 740 | 400 | 800 | 74/82 |
| QJB3/8-400/3-740/S | 3 | 8.6 | 740 | 400 | 920 | 74/82 |
| QJB4/6-400/3-980/S | 4 | 10.3 | 980 | 400 | 1200 | 74/82 |
| QJB4/12-620/3-480/S | 4 | 14 | 480 | 620 | 1400 | 190/206 |
| QJB5/12-620/3-480/S | 5 | 18.2 | 480 | 620 | 1800 | 196/212 |
| QJB7.5/12-620/3-480/S | 7.5 | 28 | 480 | 620 | 2600 | 240/256 |
| QJB10/12-620/3-480/S | 10 | 32 | 480 | 620 | 3300 | 250/266 |
| Note: 1) In the above mixing series, the values shown in the “Weight” column include the guide shroud. 2) Motor winding insulation class: F; protection class: IP68; motor duty type: S1 (continuous 24-hour operation). |
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How to Select a Pump Model
- Determine tank geometry and effective mixing volume
- Calculate required flow velocity to prevent sludge settling
- Confirm installation depth and guide rail configuration
- Evaluate continuous duty or intermittent operation requirements
Engineering Notes
- Mixing effectiveness depends on thrust-to-volume ratio
- Blade diameter affects flow coverage radius
- Installation angle influences hydraulic circulation pattern
- Continuous mixing improves biological stability
Compliance & Quality Assurance
- Factory hydraulic thrust verification
- Motor insulation resistance and winding test
- Mechanical seal pressure integrity test
- Material inspection for corrosion resistance
Safety Notice
- Do not operate under dry-running condition
- Ensure full submergence before startup
- Disconnect power before maintenance
- Do not exceed rated voltage and frequency
OEM & Custom
This pump series supports engineered configuration and duty-based matching. Technical adjustments can be made according to system requirements and installation conditions.
Available options include:
• Motor voltage & frequency
• Mechanical seal type and configuration
• Impeller diameter and thrust rating
• Surface coating and corrosion protection
Configuration is determined based on duty point and project specifications.
Based on duty point and project specifications.
FAQs
Q: Can the mixer operate under VFD control?
A: Yes, VFD can regulate rotational speed and adjust hydraulic thrust.
Q: What is the maximum submergence depth?
A: It depends on motor sealing structure and insulation class; refer to model data.
Q: What sealing system is applied?
A: Dual mechanical seal with oil chamber protection is standard configuration.
Q: How is required thrust calculated?
A: Based on tank volume, sludge concentration and required minimum flow velocity.
Q: Can it handle fibrous solids?
A: It is suitable for typical wastewater solids within specified limits.
Q: Is continuous operation supported?
A: Yes, the unit is designed for continuous submerged duty.