Product Description
Model Code Explanation
Product Overview
QJB submersible mixer is a key piece of equipment in wastewater treatment processes. It is used to achieve uniform mixing and circulation of solid–liquid two-phase flow or solid–liquid–gas three-phase flow during biological treatment. The mixer consists of a submersible motor, impeller and mounting system, and adopts a direct-drive structure.
Compared with traditional large-power motors with gear reducers, it features a more compact structure, lower energy consumption and easier maintenance.
The impeller is precision cast or stamped for high accuracy and high thrust, with a streamlined profile that is both efficient and aesthetically clean. This series is designed for applications requiring intensive solid–liquid mixing and homogenization. A schematic structure diagram is shown below:
Applications
QJB submersible mixers are mainly used for mixing, agitation and circulation in municipal and industrial wastewater treatment processes. They can also be used as circulation and water quality maintenance equipment in landscape water bodies, where the generated flow improves water quality, increases dissolved oxygen and effectively prevents the settling of suspended solids.
Operating Conditions
To ensure reliable operation of the QJB submersible mixer, the correct operating environment and running mode must be selected:
- Medium temperature ≤ 40 °C
- Medium pH range: 5–9
- Medium density ≤ 1150 kg/m³
- Submergence depth ≤ 10 m
Important: The QJB submersible mixer must operate fully submerged and must not be used in flammable, explosive, highly corrosive or high-temperature environments. For special operating conditions, customized designs can be provided on request.
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). |
||||||
Selection Guide
Selection of a QJB submersible mixer is a relatively complex task, and a correct selection has a direct impact on system performance and reliability. The basic principle is to ensure that the mixer delivers adequate mixing performance within the specified tank volume, which is generally evaluated by flow velocity.
According to typical process requirements in wastewater treatment plants, the design flow velocity for mixer selection should be in the range of 0.15–0.30 m/s. When the velocity is lower than 0.15 m/s, sufficient propulsion and mixing cannot be achieved; when it exceeds 0.30 m/s, process performance may be affected and energy will be wasted.
Therefore, before selection it is necessary to determine the application location, such as wastewater tank, sludge tank or biological tank; then define the medium properties, including suspended solids content, temperature and pH value; and consider tank geometry, water depth and installation method, all of which will influence the selection. Energy efficiency should also be taken into account, as it affects long-term operating cost. Refer to the typical flow field diagrams of submersible mixers for guidance.
To meet the mixing requirements under different operating conditions, we provide a wide range of QJB submersible mixer models and can offer professional selection support and engineering advice on request.
OEM & Custom Solutions
Chaodun Pump offers OEM and ODM customization for QJB series mixers, including material upgrades (stainless steel, duplex steel), explosion-proof motors, and adjustable mounting systems. Export-ready packaging, voltage customization, and private label branding are available upon request.
FAQs for Overseas Buyers
1. What is the QJB submersible mixer used for?
It is used for mixing and circulation in wastewater, sludge, and aeration tanks.
2. Can it be used continuously?
Yes, it is designed for 24-hour continuous submerged operation.
3. What materials are available?
Standard models use cast iron; stainless-steel versions can be customized.
4. What is the suitable flow speed?
The mixing velocity should be maintained between 0.15–0.3 m/s.
5. Can it operate in corrosive environments?
Yes, with optional corrosion-resistant coatings or stainless materials.
6. Is installation complicated?
No, the mixer can be mounted with a guide rail system for quick maintenance.
7. DoesChaodun Pump support OEM export?
Yes, full OEM customization and export packaging are supported.