Submersible Recirculation Pump QJB-W10/12, Submersible Recirculation Pump Variable Frequency Control, Sludge Recirculation Pump Reserved Hole Diameter

I. Product Introduction of Submersible Recirculation Pumps:

Duwan QJB-W10/12Submersible recirculation pumps are a new product developed based on submersible mixer production technology. These pumps are specialized equipment for mixed liquid recirculation in secondary wastewater treatment plants and for denitrification and nitrogen removal. They can also be used to pump purified water during ground drainage, for irrigation and waterway control systems, and in the recycling process or sludge extraction circuits during wastewater treatment where low head and high flow rates are required.

Structure Overview of Submersible Recirculation Pump:

a:Three-phase motor380VThree-phase50HZIP ratingIP68Stator insulation gradeFDirect startup.

b:Bearings——Lifetime lubricated bearingsNSKOrSKFOriginal import brand, lifespan exceeds40000Hour(s)

c:Blade wheel——Submersible recirculation pump equipped with a technologically advanced axial three-blade impeller, featuring excellent self-cleaning and vibration-free capabilities. The impeller design meets both high flow rate and low head requirements, forming a large flow rate in the axial direction.

d:SealedScuba Diving Recirculating PumpUtilizing Swedish Flynn Diving Motor sealing technology, ensuring secure and reliable sealing.

e:Seal Monitoring——When water enters the oil chamber, the humidity sensor in the probe-side leakage system will automatically trigger an alarm signal, to promptly identify and preventOccurredSecondary failure.

f:Temperature MonitoringScuba Water Return PumpThe motor winding employs an internationally safe overheating protection process. In the event of motor overload, excessive medium temperature, or other causes of overheating, the temperature sensor will promptly send an alarm signal or automatically shut off the water pump before the temperature exceeds the allowable temperature limit.

g:Automatic Coupling System——Diving return pump with a single track automatic coupling system for quick installation, upgrade, and maintenance.

III. Du'anQJB-WThree Key Features of the 10/12 Diving Return Pump:

One: Low head, high flow; Two: No clogging, highUtilizeRate; 3: Full stainless steel structure, strong corrosion resistance.

Section 4: Product Description:

Rated Power:1.5-22KW Impeller Diameter:400-640mm Insulation Grade:F Material: Fully Cast Stainless Steel/Standard Cast Iron Style (Available for custom order as per customer's requirement)

V. Diving Recirculation Pump Performance Parameters Table:

Technical Performance

OriginalMaterialsConfiguration:

Axle                                   304Stainless Steel

Yee Wheel                                304Stainless steel

Housing                                 304Stainless Steel

Fasteners                               304Stainless steel

Install system                             304Stainless Steel

OO-Ring                               Nitrile Rubber70

Mechanical Seal                             Tungsten carbide

Du'an Environmental ProtectionQJB-W10/12ModelDiving return pump, Submerged return pumpControl cabinet with matching control boxVFD (Variable Frequency Drive)

Du'an Environmental ProtectionQJB-W10/12Recirculation PumpVariable FrequencyControl CabinetAdoptABB ACS880SchneiderATV630SiemensMM440Core components are sourced from imported products of renowned brands.VFD (Variable Frequency Drive)Variable frequency drive required to be compatible withPLCConnection control.

(1))Duwan Environmental ProtectionSubmersible return pump kits are equipped with high-performance inverters, which should internally contain both pressure-frequency ratio within the same inverter.V/F（2Dots3Dot-matrix, open-loop vector control without PG, quadratic load control method, energy-saving mode, for the convenience of engineers' debugging. Particularly to note, in order to demonstrate the energy-saving effect of the variable-frequency inverter and meetRelevantEnergy-saving policy requires inverters to adopt control methods suitable for driving fan pump loads. Easy operation and maintenance, inverters of different powers must be from the same series.

(2)In the event of a non-hardware fault in the variable frequency inverter, the inverter can opt for a shutdown mode (free shutdown)/Fault shutdowns; until the fault is resolved, the inverter returns to normal control, reducing the number of unexpected shutdowns.

(3)Variable speed drives must have a password lock feature to prevent accidental parameter modifications.

(4)The variable frequency drive should have an intermittent automatic skip function to prevent mechanical resonance, and it should have at least3A jump frequency.

(5)The inverter features protection functions such as overvoltage, overcurrent, undervoltage, phase loss of power supply, inverter overload, inverter overheating, motor overload, etc.; the protection grade is not less thanIP20In the control cabinet setup.

(6)Total harmonic current distortion produced by the inverterTHDI(％)Should not exceed40Input terminal fundamental current coefficient must not be less than % at full load.90％, the inverter's efficiency should not be less than under any load condition.0.95,Power factor should not be less than in the variable frequency inverter speed control range.0.90。

(7)Inverter electromagnetic interference resistance capability:

MeetsEMCInterference Resistance Standard:EMC - EN 61800-3。