QJB4/12-620/3-480S Submersible Mixer

Duoan QJB4/12-620/3-480s Submersible Mixer

Motor power 4kw

Impeller diameter 620mm

Impeller speed 480r/min

Full copper coil motor

Weight 285kg

Duoan QJB submersible mixer, main component materials of submersible mixer

Component

Material

Submersible mixer high speed

Propeller AISI 316L, main unit AISI304

Submersible flow pusher low flow

Propeller fiberglass, main unit anti-corrosion carbon steel

Shaft

AISI 420

Mechanical seal

Tungsten carbide or silicon carbide

Chain/Wire rope

AISI 304

Guide rail and bracket

AISI 304

Lifting frame and support

AISI 304

All connecting accessories/chemical anchor bolts

AISI 316

Mixing equipment mainly includes submersible mixers and vertical mixers.

Submersible mixer equipment requires technical standards equivalent to imported brands like KBS, and manufacturer authorization must be provided.

Submersible mixer equipment should use technically mature products and provide operational records of similar equipment in no less than 3 projects over the past 5 years.

Submersible mixer technical agreement:

1. Scope of supply

The sewage mixer produced by Jiangsu Duoan is a complete device, equipped with guide rails, 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 and intermittent operation under fully submerged conditions. It must operate smoothly without vibration throughout the entire process, with a design service life of 15 years and 8000 hours.

Each submersible mixer should work in sewage and must promote the flow of sewage.

The submersible mixer should operate with balanced rotation, without jamming, stalling, or vibration.

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

Each submersible mixer is equipped with stainless steel guide rails and stainless steel wire ropes for free lifting and steering.

1 Wiring chamber

The motor wiring chamber has an IP68 protection rating 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-sealing system is adopted. Even if the lower seal fails and liquid enters the stator chamber, it will not contact the bearings or stator. The mechanical seal uses 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 transmission is a single shaft, sealed and not in contact with the liquid.

5 Submersible mixer impeller

Designed with a propulsion-type anti-twist curve, the impeller has a stamped structure that is lightweight, high-strength, and excellently balanced. The optimized impeller surface has a self-cleaning function 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 protection rating IP68 and insulation class F. The motor should not overload even under heavy mixing loads. It should start 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 use of bolts, pins, or other connectors that require drilling into 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. For long-term operation, imported NSK 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 sealed control and power underwater cables. If the power cable is multi-core, each cable must be individually sealed. Cables should extend into the wiring chamber 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 alarm signals should be issued before 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

Duoan provides all 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 Duoan QJB high-speed submersible mixer

1 Fully assembled submersible mixer;

2 Matching submersible motor;

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

4 A set of shared lifting devices including movable lifting支架, 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 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 spare parts and matching tools within the warranty period.