QJB Submersible Mixer

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

Installation Diagram of Stainless Steel Sewage Mixer

Motor Power 4KW

Impeller Diameter 620mm

Impeller Speed 480r/min

Full Copper Coil Motor

Weight 285kg

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 of 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 less 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 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 its service life, with a design lifespan of 15 years and a mean time between failures of 8,000 hours.

Each submersible mixer should work in sewage and must 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 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 an IP68 protection rating and must be completely sealed against surrounding liquids.

2) Cooling

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

3) Shaft Seal

An independent high-quality sealing system is used to ensure that even if the lower seal fails and liquid enters the stator chamber, it will not contact the bearings or 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 the mechanical seal has a service life of no less than 25,000 hours.

4) Shaft

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

5) Submersible Mixer Impeller

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

Equipped with a flow guide cover to rectify 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 IP68 protection and F-class insulation. The motor should not overload under high mixing loads. It should start no less than 15 times per hour, with the average stator winding temperature rise not exceeding 80°C. The stator should be thermally pressed into the stator chamber without the use of bolts, pins, or other connectors requiring drilling on the stator chamber.

7) Bearings

The impeller shaft is supported by a double-row angular contact ball bearing and a single-row deep groove ball bearing. To ensure long-term and reliable operation, NSK imported bearings are selected with a service life of no less than 100,000 hours.

8) Cable and Cable Seal

The motor should be equipped with underwater cables for control and power, with reliable sealing. If the power cable is multi-core, each cable should be individually sealed. Cables 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 suspend the cable from a hook and support its weight.

9) Leakage Sensor

A sensor is provided in the sealing cavity to detect liquid leakage. All signals should be monitored separately and trigger alarms before severe damage occurs to the impeller or motor.

10) Thermal Protection

Each phase of the motor is 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 provides 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 hoisting 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 devices (movable lifting bracket, hoist, stainless steel lifting chain, etc.);

(5) Submersible cable for each mixer;

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

(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 within the warranty period.

Main contents of disassembly and inspection include:

1. Check the packing or mechanical seal condition, such as the clearance of shaft sleeves, gland, bottom sleeve, pressure relief ring, oil seal ring, mouth ring, partition, bushing, etc., ensuring it meets requirements. For bearing structures, measure the clearance;

2. Measure the clearance of various pump components;

3. Check shaft straightness, calibrate pressure gauges and valves, inspect lubricating oil pumps, seal oil pumps, coolers, filters, and pipelines; inspect piston linkage mechanisms.        Proper disassembly and assembly steps prevent damage to the equipment during the process and lay a foundation for the subsequent installation of the submersible mixer.

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