QJB Submersible Mixer

Du'an Environmental Protection QJB4/12-620/3-480S Submersible Mixer 

Stainless Steel Sewage Mixer Installation Diagram

Motor Power 4KW

Impeller Diameter 620mm

Impeller Speed 480r/min

All-Copper Coil Motor

Weight 285kg

Four Installation Methods for Du'an Environmental Protection QJB Submersible Mixer:

The installation system of the QJB submersible mixer has four installation methods, one of which can be selected based on the actual site conditions.

Installation System One Installation Sequence: Support Bracket (Upper) → Upper Turntable → Guide Rod → Support Bracket (Lower) → Submersible Mixer (Including Lower Turntable) → Adjust the Angle of the Submersible Mixer as Required → Cable Expansion Hook → Cable Fixing Clamp.

Installation System Two Installation Sequence: Base → Guide Rod → Support Seat → Support Bracket (Middle) → Lifting Frame → Hand Chain Hoist → Lifting Chain → Submersible Mixer → Adjust the Angle of the Submersible Mixer as Required → Cable Expansion Hook → Cable Fixing Clamp.

Installation System Three Installation Sequence: Base → Guide Rod → Support Bracket (Upper) → Support Bracket (Middle) → Hanger Seat → Lifting Frame → Hand Chain Hoist → Lifting Chain → Submersible Mixer → Adjust the Angle of the Submersible Mixer as Required → Cable Expansion Hook → Cable Fixing Clamp.

Installation System Four Installation Sequence: Guide Rod → Bracket → Hanger Seat → Lifting Frame → Hand Chain Hoist → Lifting Chain → Submersible Mixer → Cable Expansion Hook → Cable Fixing Clamp.

Du'an Environmental Protection QJB Submersible Mixer, Main Component Materials of Submersible Mixer

Mixing equipment mainly includes submersible mixers and vertical mixers.

The technical standards and quality requirements for submersible mixer equipment should be equivalent to imported brands like KBS, and manufacturer authorization must be provided.

Submersible mixer equipment should use mature products with advanced technology and provide operational performance records of similar equipment in no fewer than three projects over the past five years.

Submersible Mixer Technical Agreement:

1. Scope of Supply

The sewage mixer produced by Jiangsu Du'an Environmental Protection is a complete unit, equipped with guide rods, lifting devices, underwater cables, fixing bolts, fasteners, and other accessories necessary for installation and safe operation.

2. Technical Requirements

The submersible mixer should be capable of continuous or intermittent operation under fully submerged conditions. It must operate smoothly without vibration throughout the entire process, with a designed service life of 15 years and a mean time between failures of 8,000 hours.

Each submersible mixer should be able to work in sewage and promote the flow of sewage.

The submersible mixer should rotate smoothly without jamming, stalling, or vibration.

The submersible mixer should undergo a sealed air pressure test at a pressure of 3 kg/cm² for 5 minutes without leakage.

Each submersible mixer should be equipped with stainless steel guide rods and stainless steel wire ropes for free lifting and steering.

1) Terminal Box

The motor terminal box should have a protection rating of IP68 and must be completely sealed from the surrounding liquid.

2) Cooling

Motor cooling is achieved through heat conduction from the stator to the housing.

3) Shaft Seal

An independent high-quality sealing system should be used to ensure that even if the lower seal fails and liquid enters the stator chamber, it will not come into contact with the bearings and stator. The mechanical seal should be made of corrosion-resistant silicon carbide/silicon carbide, suitable for a pH range of 6-9. The mechanical seal should be maintenance-free, resistant to thermal shock, and capable of emergency operation.

The manufacturer should ensure that the service life of the mechanical seal is not less than 25,000 hours.

4) Shaft

The motor shaft should be a single shaft, reliably sealed and not in contact with the liquid.

5) Submersible Mixer Impeller

The impeller should adopt a propulsion-type anti-twist curve design, with a stamped structure that is lightweight, high-strength, and well-balanced. The optimized impeller surface should have a self-cleaning function to avoid clogging and scaling.

Equipped with a flow guide cover to rectify the flow, increase axial flow and directionality, and enhance circulation flow.

6) Motor

The motor should be a three-phase squirrel cage motor, 3-phase 380V, 50Hz, with protection rating IP68 and insulation class F. The motor should not overload even under heavy mixing loads. It should be capable of starting no less than 15 times per hour, with the average temperature rise of the stator windings not exceeding 80°C. The stator should be thermally pressed into the stator chamber without the need for drilling holes, bolts, pins, or other connecting devices on the stator chamber.

7) Bearings

The impeller shaft should be supported by a double-row angular contact ball bearing and a single-row deep groove ball bearing. To ensure long-term and reliable operation, imported NSK bearings should be used, with a service life of not less than 100,000 hours.

8) Cable and Cable Seal

The motor should be equipped with underwater control and power cables, with reliable sealing. If the power cable is multi-core, each cable should be individually sealed. The cable should extend into the terminal box and be sealed with reusable rubber seals. Resin or other canned sealing materials are not allowed. Each cable should be equipped with a cable net or cable clamp to hang the cable on a hook and support its own weight.

9) Leakage Sensor

A sensor should be provided in the sealing cavity to detect liquid leakage. All signals should be monitored separately, and alarm signals should be issued before serious damage occurs to the impeller or motor.

10) Thermal Protection

Each phase of the motor should be protected by a normally closed temperature sensor. The three sensors should be connected in series, activating at 140°C, and connected to the control cabinet.

11) Installation and Lifting System

Du'an Environmental Protection should provide a complete set of installation and fastening materials for the submersible mixer. The installation system should include guide rails, wire ropes, an arm-type lifting frame, and a hand-operated lifting device.

Main Components of Jiangsu Du'an Environmental Protection QJB High-Speed Submersible Mixer

(1) Fully assembled submersible mixer;

(2) Matching submersible motor;

(3) Complete installation system (guide rails, brackets, fasteners, etc.);

(4) A set of shared lifting device (movable lifting frame, lifting hoist, stainless steel lifting chain, etc.);

(5) Submersible cable for each mixer;

(6) Submersible mixer protection components, including leakage protection, temperature protection, and protection controller;

(7) Local control cabinet and junction box;

(8) All connecting accessories and fasteners for installation (including stainless steel chemical anchor bolts, nuts, washers, etc.);

(9) Two-year supply of spare parts and matching tools during the warranty period.

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