Duwan Environmental's QJB-W7.5 sludge recycle pump is used with a variable frequency control cabinet.

Full Copper Winding Motor

NSK Bearings

Tungsten Carbide Mechanical Seal

CM 10-meter Sealed Cable

304 Stainless Steel Through-Wall Pipe, Sliding Door, Installation System

The Duwan Sludge Recirculation Pump is a new product developed based on the submerged mixer production technology. It is a professional equipment for mixing liquid recirculation in secondary wastewater treatment plants and denitrification nitrogen removal. It can also be used for pumping purified water during ground drainage, irrigation, and controlling waterway systems, as well as in the recirculation process of wastewater treatment and sludge extraction circuits requiring low head and high flow rates.

Structure Introduction of Submersible Recirculation Pump:

a:Three-phase motor380VThree-phase50HZPlease provide the Chinese content to be translated.IP68Stator insulation gradeFLevel, start directly.

b:Bearings——Lifetime lubricated bearingsNSKOrSKFOriginal Imported Brand, Lifespan Exceeds40000Hour.

c:Propeller——The submersible recirculation pump is equipped with a state-of-the-art axial three-blade impeller, featuring excellent self-cleaning and vibration-free capabilities. The impeller's design meets both high flow and low head requirements, generating a large flow in the axial direction.

d:SealedSubmersible Recirculation PumpUtilizing Swedish Flyligh 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 detect and preventOccurredSecond failure.

f:Temperature MonitoringDiving Recirculating PumpThe motor winding utilizes an internationally advanced and safe overheat protection process. In the event of motor overload, excessive medium temperature, or other causes of overheating, the temperature sensor will promptly emit an alarm signal or automatically shut off the pump before the temperature exceeds the allowable temperature limit.

g:Automatic Coupling System——The submersible recirculation pump is paired with a single-track automatic coupling system, ensuring quick installation, upgrade, and maintenance.

ThreeQJB-WThree Key Features of the Series Submersible Recirculation Pumps:

Micro-elevation, high flow; No clogging, high efficiency.Utilize1. High efficiency 2. Full stainless steel construction, excellent corrosion resistance

Section 4: Product Description:

Power Rating:1.5-22KW Impeller Diameter:400-640mm Insulation Grade:F Material: Fully Cast Stainless Steel/Standard Cast Iron Model (Available for customization as per customer requirements)

Section 5: Submersible Recirculation Pump Performance Parameters Table

Duane sludge recirculation pump is equipped with a control cabinet.Variable-frequency drives are utilizedABB ACS880, Schneider ATV630, Siemens MM440, and other core components utilize imported brands. Variable-frequency drives require connection and control with PLCs.

 (1)Variable Frequency Control CabinetUtilizing high-performance inverters, the same inverter should simultaneously contain voltage-frequency ratio.V/F (2-point and 3-point), open-loop vector control without PG, quadratic load control method, and energy-saving mode are provided for ease of engineering debugging. It is particularly noted that to demonstrate the energy-saving effect of the variable-frequency inverter and comply with the national energy-saving policy guidelines, the inverter must employ control methods suitable for driving fan-pump loads. It should be user-friendly for operation and maintenance, and different power ratings of the inverter must be part of 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 shutdown); it will remain in this state until the fault is resolved, at which point the inverter will resume normal control, reducing the number of unexpected shutdowns.

(3) Variable-frequency drives must be equipped with a password lock feature to prevent accidental parameter changes.

(4) The inverter should be equipped with an intermittent automatic jump function to prevent mechanical resonance, and it should have at least 3 jump frequencies.

(5) The inverter features protection functions against overvoltage, overcurrent, under-voltage, missing phase of power supply, inverter overload, inverter overheating, motor overload, etc.; the protection rating is not less than IP20, and is set in the control cabinet.

(6) The total harmonic current distortion (THDI) generated by the variable frequency inverter should not exceed 40%; the fundamental wave current coefficient at the input terminal should be no less than 90% under full load, and the efficiency of the inverter should be no less than 0.95 under any load condition. The power factor should be no less than 0.90 within the variable frequency inverter's speed control range.

(7) Inverter's electromagnetic interference (EMI) resistance capability:

As per your request, there is no Chinese content provided to translate. Please provide the text you would like translated.EMC Interference Standard: EMC - EN 61800-3.