Technical data of sludge pump for QJB-W reflux pump in denitrification tank

The technical data of the QJB-W reflux pump sludge pump in the denitrification tank is a new product developed on the production technology of submersible mixers. This pump is a professional equipment for mixed liquid reflux and denitrification denitrification in secondary sewage treatment plants. It can also be used for pumping purified water during surface drainage, irrigation, and controlling waterway systems. In the process of wastewater treatment, micro head and high flow places are required in the recirculation or mud suction circuit.

Product introduction of submersible reflux pump:

The QJB-W submersible reflux pump is a new product developed based on the production technology of submersible mixers. This pump is a professional equipment for mixed liquid reflux, denitrification and denitrification in secondary sewage treatment plants. It can also be used for pumping purified water during surface drainage, irrigation and controlling waterway systems. In the process of wastewater treatment, micro head and high flow areas are required in the recirculation or mud suction circuit.

Introduction to the structure of submersible reflux pump:

a: Three phase motor, 380V three-phase 50HZ, protection level IP68, stator insulation level F, direct start.

b: Bearings - use lifetime lubricated bearings, NSK or SKF, with a service life of over 40000 hours.

c: Impeller - The submersible reflux pump is equipped with an advanced axial running three bladed impeller, which has good self-cleaning and vibration free functions. The design of the impeller can simultaneously meet the requirements of high flow rate and low head, and form a large flow rate in the axial direction.

d: Sealing - The submersible reflux pump adopts Swedish Feili submersible motor sealing technology to ensure safe and reliable sealing.

e: Sealed monitoring - When water enters the oil chamber, the humidity sensor in the probe leakage system will automatically issue an alarm signal to detect it in a timely manner and prevent a second malfunction.

f: Temperature monitoring - The motor winding of the submersible reflux pump adopts a safe overheating protection process. Once overheating occurs due to motor overload, high medium temperature, or other reasons, the temperature sensor will promptly issue an alarm signal or automatically shut down the water pump before the temperature exceeds the allowable temperature limit.

g: Automatic coupling system - The submersible reflux pump is equipped with a single guide rail automatic coupling system to ensure quick installation, lifting, and maintenance.

The three major features of the QJB-W series submersible reflux pump are:

1： Micro head, high flow rate; 2： No blockage, high utilization rate; 3： All stainless steel structure, strong corrosion resistance;

Product Description:

Power consumption: 1.5-22KW Impeller diameter: 400-640mm Insulation grade: F Material: Cast all stainless steel/ordinary cast iron (can be customized according to customer requirements)

Technical data of sludge pump for QJB-W reflux pump in denitrification tankMain component materials:

General requirements for Du'an environmental protection submersible reflux pump:

a. Each reflux pump should be able to operate continuously, intermittently, and resume operation after a long period of shutdown under fully submerged conditions.

b. The pump should be able to withstand reversal caused by backflow water without causing any harm to the pump.

c. The water pump device should have no vibration, no cavitation, and operate smoothly within the designed supply scope. The rotor components of the pump should undergo dynamic and static balance tests.

d. The pump casing should have sufficient thickness to withstand all loads, including hydrostatic test pressure and continuous working pressure.

e. The impeller and pump shaft are fixed at the end of the shaft with a key connection and sealed. The impeller and shaft are locked to prevent loosening, whether they rotate forward or occasionally reverse.

f. The impeller should undergo dynamic and static balance tests.

g. The shafts of the pump and motor should be continuous and uninterrupted, with the pump shaft being an extension of the motor shaft. Coupling is not acceptable.

h. The upper bearing should be a single row ball bearing. The lower bearing is a double row radial thrust bearing used to bear radial force and axial thrust. The smaller working life of its bearings is 100000 hours.

i. The lower bearing should be equipped with a thermal detector to monitor the temperature of the bearing. The detector needs to be in direct contact with the outer shell of the thrust bearing. If the temperature rises, the detector will sound an alarm and stop the pump.

j. Each pump should be equipped with a dual independent mechanical seal system with upper and lower components. The lower seal should be separated from the impeller hub. Mechanical seals need to operate within an oil chamber that can lubricate overlapping sealing surfaces at a stable flow rate. Mechanical seals should be able to rotate clockwise or counterclockwise without damaging or losing sealing components, and do not require maintenance or adjustment.

k. The mixed liquid reflux pump is mainly composed of impeller, submersible motor, self coupling system, outlet check valve and short pipe, guide rod and lifting device, etc. Its design should ensure the convenient and reliable operation of the pump. The pump is installed on the guide rod for easy placement. The self coupling system ensures fast, convenient, and reliable connection with the pool wall water pipes.

l. The impeller of the mixed liquid reflux pump is a self-cleaning propeller blade impeller. Its structure should ensure full utilization, no blockage or slagging, and the angle of the blades should be selected according to the normal operating conditions.

m. All mixed liquid reflux pumps use imported NSK bearings.

Exit check flap door (including outlet short pipe)

a. The sealing surface of the valve body of the flap door should have a slope of about 10 °, and use rubber soft seal water stop. It should be connected to the outlet short pipe flange of the mixed liquid reflux pump through a flange.

b. The door adopts a double hinge structure, and the valve body and valve plate are not allowed to have any casting defects. Apply anti-corrosion coating on the surface.

c. The resistance of the outlet flap does not affect the normal start-up and operation of the mixed liquid reflux pump, and it is required that the flap has no leakage under the given reverse head pressure.

Installation of Jiangsu Du'an Environmental Protection Sludge Internal Reflux Pump:

Install

Jiangsu Du'an Environmental Protection should strictly follow the manufacturer's instructions and recommendations for installation at the locations specified on the drawings, and should also provide the manufacturer's recommended oil and grease for equipment warranty period operation. The anchor bolts shall be provided and installed by the supplier and shall comply with the requirements of the manufacturer.

concrete foundation

The concrete foundation of the reflux pump is the responsibility of the civil engineering supplier. The equipment supplier should coordinate with the civil engineering supplier to ensure the correct foundation position. The concrete strength grade should meet the needs of the installation and operation of the mixer, and unless otherwise specified, the foundation bolts should be placed correctly during grouting.

Factory painting

A. Before painting, all equipment surfaces should be cleaned and dried to remove grease, rust, soil, and other surface dirt.

B. All reflux pumps, motors, and other driving equipment should be coated with a layer of primer and topcoat in the factory according to the requirements of this specification, and reliable anti-corrosion treatment should be carried out on the surfaces that come into direct contact with sewage during future operation.

Jiangsu Du'an Environmental Protection Reflux Pump Wire Connection Method:

Four core wire: Three core thick wire is the three-phase live wire, and one core wire with yellow/green dual color is the ground wire.

Five core wire: The three core thick wire is the three-phase live wire, the one core wire is the yellow/green dual color ground wire, and the one core wire is the 31 # wire (motor leakage signal wire)

Seven core wire: The three core thick wire is the three-phase live wire, the one core wire is the yellow/green dual color ground wire, the one core wire is the 31 # wire (motor leakage signal wire), and the other two core wires are the 11 # and 12 # wires (motor overheating protection signal wire)