QJB Submersible Suspended Underwater Propeller

Du'an Environmental Protection QJB Low-Speed Submersible Mixer is suitable for various water treatment processes and industrial applications requiring uniform mixing and reaction of solid-liquid two-phase or solid-liquid-gas three-phase media. It is mainly composed of a submersible motor, gear reducer, spiral impeller, sealing system, manual hoist mechanism, installation system, and electrical control device.

QJB Low-Speed Submersible Mixer Model Description

QJB------Low-Speed Submersible Mixer (Submersible Agitator)

1.5-----Motor Power (KW)

4-----Motor Poles

42-----Impeller Diameter (mm)

2-----Number of Blades

1800-----Rated Speed (r/min)

S/P-----Material: S stands for stainless steel, P stands for polyurethane 

Du'an Environmental Protection Submersible Mixer Technical Performance Requirements:

The submersible mixer produced by Du'an Environmental Protection can be fully installed on the original mounting bracket without stopping water on site.

All electrical interfaces of the submersible mixer are consistent with the on-site electrical control equipment interfaces to avoid causing failures in the electrical control system.

Submersible Mixer Performance and Structure:

The submersible mixer mainly consists of a two-blade propeller, gear reducer, submersible motor, and submersible sealed cable.

The output power of the submersible mixer ensures thorough mixing of the pool without significant sedimentation, meeting the required hydraulic and flow conditions.

The submersible agitator is mounted on a bracket at the bottom of the pool via guide rails. The installation slide allows free lifting along the guide rails, and no pool draining is required for lifting and installation. The entire weight of the submersible mixer should be supported by the lifting bracket, which can withstand the thrust generated by the agitator.

Each submersible mixer must operate continuously under full submersion conditions at a maximum allowable depth of 20 meters underwater, while also meeting intermittent operation and resuming operation after long-term shutdown. Throughout the operation, the agitator must run smoothly without jamming or vibration.

Housing Material:

The housing of the submersible mixer is made of high-quality gray cast iron GG25 or better material. The design thickness of the housing is sufficient to withstand loads, with a smooth surface free of pores and a compact structure. All water-sealed surfaces should be sealed with nitrile rubber O-rings.

Propeller Impeller Material:

The propeller is two-bladed, made of polyurethane or fiberglass, with an internal metal skeleton and an external protective coating. It is designed for handling conventional wastewater. It features a rear-swept, hydraulically balanced, non-clogging, self-cleaning design. The propeller has excellent hydraulic performance, promoting the flow of wastewater in the pool channel.

The blades should be "flexible" and capable of absorbing changing hydraulic loads. Each blade is mounted in a socket on the side of the hub via a cast iron shaft. The hub is fixed to the end of the shaft with a single key, sealed with a protective cap, and secured with a locking washer system.

Main Shaft Material Description:

The motor shaft and propeller shaft are connected via a gearbox. The shafts are made of wear-resistant stainless steel and can withstand all axial and radial loads. The propeller shaft is fully protected by mechanical seals, O-rings, and radial seals, completely isolating it from the mixing medium to prevent corrosion.

Bearing Description:

All bearings of the submersible agitator are high-quality maintenance-free bearings with long-term grease lubrication, capable of withstanding axial and radial loads. The design life of the bearings is not less than 100,000 hours.

Shaft Seal or Mechanical Seal:

A mechanical seal and two radial seal rings are installed between the agitator gearbox and the hub. The radial seal rings are placed on bronze sleeves, providing additional protection for the mechanical seal and facilitating replacement. The shaft seal system includes a sealed oil chamber where the mechanical seal is installed and operates. A pair of radial seal rings is also installed between the motor chamber and the gearbox. The mechanical seal is maintenance-free and can rotate clockwise or counterclockwise without affecting its sealing function. The mechanical seal is made of silicon carbide or tungsten carbide, offering good mechanical strength and resistance to thermal shock. The medium's pH range should be between 4 and 10. The seal material is nitrile rubber, with strong tear resistance and a long service life. The design life of the mechanical seal is greater than 25,000 hours.

Submersible Motor Description:

The submersible motor is a three-phase squirrel-cage induction motor. The motor has an IEC IP68 protection rating and an F-class insulation rating, 155°C. The rated power of the motor ensures that the submersible mixer does not experience overload during use. The motor can be started more than 10 times per hour. The motor shaft and rotor have passed dynamic and static balance tests. The motor is designed to operate in environments up to 40°C (104°F), capable of submerging and continuously agitating liquids at 40°C, with the average temperature rise of the stator windings not exceeding 80°C. To monitor the temperature of each phase winding, thermal switches are installed in each phase stator winding coil. The thermal switches are set to open at 130°C and are connected to the control cabinet and control relay.

The motor and cable can be used continuously at a maximum depth of 20 meters without losing their waterproof performance (compliant with IP68 protection rating). The submersible motor can be adequately cooled by the surrounding medium without relying on a cooling jacket or external cooling system. Additionally, the motor chamber is filled with insulating oil to ensure excellent insulation and cooling performance and to prevent water leakage from burning out the motor.

Submersible Sealed Cable Description:

The motor is equipped with a submersible sealed cable, which includes both control and power cores in the same cable. The motor has a separate and reliable cable entry. The cable complies with IEC standards and is provided with sufficient length to connect to the junction box or local control cabinet without splicing. The cable enters the terminal chamber using a reusable double-compression rubber sleeve seal, ensuring quick cable replacement. The cable seal is specially vulcanized to prevent liquid from penetrating the motor due to cable sheath damage. The cable outlet should be axial, flush with the outer surface of the motor housing, and secured with cable clamps to the cable tensioner to avoid swaying due to water flow impact and to prevent snagging during lifting. Both the motor and cable can be used continuously at a depth of 20 meters without losing their waterproof performance.

Gearbox Description:

The submersible mixer is driven by an efficient planetary gearbox. The gearbox housing is integrated with the agitator housing, and its surface should transition smoothly to the hub and motor housing, ensuring high flow stability and good hydraulic characteristics, thereby improving the overall efficiency of the submersible mixer. The gearbox is equipped with high-precision, high-efficiency, low-load two-stage planetary gears made of high-wear-resistant alloy steel. The gearbox is filled with oil to lubricate and cool the transmission system. The gearbox brand is Shuntian or SEW. The design life is not less than 100,000 hours.

Monitoring System Description:

Three series-connected thermal switches are installed in the three-phase stator windings of the submersible mixer to monitor stator temperature rise. The thermal protection activates at 130°C, triggering an alarm and stopping the motor. The submersible mixer is equipped with a leakage sensor to detect leaks in the sealed oil chamber, preventing water from entering the motor and causing damage. The leakage sensor is an electrode-type sensor, and its signal can be monitored by a protection relay, issuing an alarm signal if water enters the motor.

Main Material Description:

The materials of the submersible mixer are suitable for industrial wastewater treatment requirements.

Anti-Corrosion Coating Description:

All materials used in the manufacture of the submersible mixer are suitable for the corrosive environment of industrial sewage plants. Unprotected or non-corrosion-resistant materials are treated according to general technical requirements.

Submersible Mixer Technical Parameters:

Other Random Accessories or Requirements

The submersible mixer is randomly equipped with 6 sets of manual hoisting devices (including steel wire ropes and three-prong hooks) installed on the original lifting bracket. Some steel wire ropes and hooks can be reused, with the required quantity replaced or supplemented based on site conditions. The material of the hoisting device: the underwater part requires stainless steel 304 or better, and the above-water part requires stainless steel 201, 304, or 316 or better. The hoisting device should operate flexibly in both forward and reverse directions and should brake immediately after stopping. The brake is automatically released during manual operation. The hand crank of the hoisting device must have an anti-loosening structure to prevent the crank from falling off.

The submersible mixer has a two-year warranty. During the warranty period, on-site or remote guidance is provided for equipment maintenance. If a non-human-operated fault occurs during the warranty period, repairs must be arranged, and the warranty period for that submersible mixer will be recalculated from the date it is put back into service after repair. During the warranty period, if the same fault occurs twice or more on the same submersible mixer, it must be replaced free of charge with a new mixer of the same model.

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