QJB Submersible Propulsion Technology Agreement
Instructions for Low-Speed Submersible Propeller
Duwan Environmental's QJB Submersible Propeller is designed for mixing suspended liquids in wastewater treatment plants and industrial processes, including aeration basins in industrial and urban wastewater treatment plants. It generates a powerful water flow with low tangential velocity, which is usable Established water flow during the cycles of nitrification, denitrification, and phosphorus removal.
The low-speed thrusters feature a compact structure, small size, and light weight. They are easy to operate and maintain, with convenient and quick installation, and a long service life. The blades have an auto-cleaning function, preventing debris entanglement and clogging. When used in conjunction with the aeration system, they significantly reduce energy consumption, increase oxygenation levels, and effectively prevent sedimentation. The motor windings of the low-speed thrusters are F-grade insulated, with an IP68 protection rating. They are equipped with a single-lubrication, maintenance-free imported bearing, featuring oil chamber leakage detection and motor winding overheating protection, ensuring safer and more reliable motor operation.
The low-speed propulsion equipment features a seal friction part material made of corrosion-resistant tungsten carbide, with all fasteners made of stainless steel. The diving depth can be adjusted vertically as needed, and the lifting system can rotate around the guide rod by ±60° within the horizontal plane. The base, support frame, and lower support bracket of the lifting system are all fixed with expansion bolts, eliminating the need for pre-drilled holes. When the pool depth H is greater than 4 meters, it is recommended to use System II, which requires a concrete foundation to be constructed at the bottom of the pool.
The base of the low-speed thruster hoisting system, the steel rope bracket, and the guide base are all connected to the pool with expansion bolts, no pre-drilled holes required.Low-speed Propulsion SystemInstalled the systemThe II guide replaces steel wire ropes, featuring convenient transportation and simple on-site installation. The low-speed thrusters fundamentally avoid the issue of wire rod bending and deformation during transportation, which could affect normal use. Additionally, they effectively improve situations where it's difficult to hoist due to installation errors of the wire rod in excessively deep pools.
The low-speed propeller installation system is made of stainless steel (or carbon steel). In the installation system, excluding the guide rod or guide wire, and the lifting base, multiple QJB submerged propellers can share a single lifting device. It is widely applicable in the anaerobic and aerobic treatment of industrial wastewater and urban domestic sewage in industries such as oil, chemicals, dyeing, leather, food, papermaking, textiles, and pesticides.Slow-speed PropellerPress-molded using special materials, the impeller diameter reachesΦ2500, the blades, optimized and designed with a sweptback shape, offer high hydrodynamic efficiency and feature an automatic self-cleaning function.
1． Equipment Name Diving Propulsion Device
2． Model Specifications QJB4/4-2500/2-42/P
3． Primary Technical Parameters
Model | QJB4/4-2500/2-42/P |
Motor Power | 4.0kW |
Impeller Speed | 42rpm |
Impeller Diameter | 2500mm |
Motor Protection Rating | IP68 |
Insulation Grade for Electric Motors | F |
4． Usage
Used for low-speed stirring in biological treatment ponds to ensure thorough mixing of sludge and water without causing aeration.
5. Technical Performance
5.1 The underwater mixer rotates smoothly and ensures there is no jamming, stalling, or vibration.
5.2 Submersible mixers undergo a sealed air pressure test before shipment, with a test pressure of 3 kg/m³.2Please provide the Chinese content you would like translated into American English.5 minutes without any leakage.
March 5.3 Submersible Concrete Mixers feature dual mechanical seal and lip seal structureMaterialsThe mechanical seal ensuresOperates reliably for 8,000 hours without the need for replacement.
The submersible mixer's lead cable is made of YZW type rubber sheathed flexible cable as specified in GB5013.2, or equivalent cables with similar performance. The standard configuration length for each unit is 10 meters. The cable sealing head is treated with a special vulcanization process to prevent cable sheath damage and water leakage into the motor.
The 5.5 submersible mixer surface is coated with anti-corrosion paint, featuring a glossy finish without any stains, dents, or cracks; the bottom paint of the motor housing is PVC epoxy resin, while the surface is coated with chlorinated rubber paint.
5.6 The oil mixing pump room is equipped with a sealing leakage protection device.
5.7 The color-coded wires (yellow/green) in the submersible mixer's cable are designated as the ground wire, ensuring reliable connection. The ground symbol is clearly marked and is not easily worn off during the use period.
On August 5th, the propellers and rotors of the submerged mixer were tested using dynamic balancing, achieving a balance accuracy of G6.3.
5.9 The underwater mixer can rotate horizontally within a 120° range, allowing for adjustable flow angle adjustments.
6. Service Life
Submersible mixers operate for an average of not less than10,000 hours, with a total service life of not less than 15 years.
7. Structural Design
7.1 Terminal Box
The junction box is completely sealed and isolated from the surrounding liquids and motor parts; Cooling: The motor stator is cooled by the surrounding liquid.
7.2 Gear
Utilizing planetary gear transmission to reduce the impeller speed.
7.3 Blade
The blades are in a double banana shape, cast in aluminum alloy, effectively preventing blade breakage; the import edge of the blades is bent backward, featuring...Long-termAutomatic cleaning performance; secured on the shaft with a locking nut, easy to dismantle and replace during lifting and maintenance.
7.4 Motor
Our company has adopted a full-submerged squirrel-cage induction motor, with the insulation level of the submersible motor windings being...F rating, protection class IP68. No more than 1,500 rpm per minute. The motor can run continuously, starting at least 12 times per hour without causing any harmful effects.
7.5 Oil Chamber
The oil chamber plays a shock-absorbing and noise-reducing role between the lubricating and cooling sealing devices, bearing supports, reduction boxes, motors, and liquids. A bladder device can be installed as needed to reduce and lower the pressure rise within the oil chamber.
7.6 Bearings
The motor shaft is supported by two bearings, which are double-row ball bearings; while the main bearing is a double-row spherical roller bearing; the impeller shaft is supported by a double-row angular contact ball bearing and a cylindrical roller bearing.
The service life of the mixer bearing is greater than60,000 hours.
7.7 Axle Seal
The mixer is composed of two mechanical seals and one lip seal. Seal material: Tungsten Carbide.Tungsten Carbide
7.8 Mechanical Seal
Each wheel shaft is equipped with a series-type double independent rotating shaft mechanical sealing system, with the sealing unit operating within a single oil tank. The mechanical sealing design has a lifespan greater than...25,000 hours.
7.9 Monitoring System
Two thermosensitive switches are installed in the stator winding, with the thermosensitive switches inAt 125℃ operation, the motor's temperature should not exceed 80℃ under normal conditions.
7.10 Control System
The control box provides self-protection for the equipment, featuring overheat, overcurrent, and leakage protection functions, and is customizable.PLC Interface.
8. Materials
Shell GG25 Cast Iron
Propeller Composite Polyurethane
Spindle Stainless Steel
Mechanical Seals Tungsten CarbideCarbide Tungsten
Pilot Bar Stainless Steel
Lifting Bracket Stainless Steel
Enhance Steel Rope Stainless Steel
Silicone Sealing Materials Dacron rubber
Fasteners Stainless SteelASTM321
9. Scope of Compatibility
Fully Assembled Submersible Propulsion System
National Standard All-Tin Copper CoilSubmersible Motor
Complete lifting equipment, guide rods, brackets, wire ropes, etc.
YCW Model10-meter underwater cable, cable clamp, junction box
Pusher accessoriesAll attached connections, foot bolts
Low-Speed Flow Inducer On-SiteControl Box
