Duwan Environmental Equipment (Jiangsu) Co., Ltd

Sludge Recirculation Pump Technical Performance and Structure

QJB-W7.5 Through-the-Wall Pump

Submersion Wall Penetration Pump Installation Diagram

Stainless Steel Sludge Through-the-Wall Pump Quotation

(1) General Requirements

Each recirculating pump should be capable of continuous operation, intermittent operation, and resuming operation after a long-term shutdown under full immersion conditions.

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

c. The pump unit, within the scope of the designed supply, should be vibration-free, free from cavitation, and operate smoothly. The pump's rotor components should undergo dynamic and static balance tests.

d. The pump casing must have sufficient thickness to bear all loads, including static water pressure test pressure and continuous working pressure.

e. The impeller and pump shaft are keyed and fixed at the end of the shaft, with sealing applied. A locking device must be used on the impeller and shaft to prevent loosening, whether the impeller and shaft are rotating clockwise or occasionally reversing.

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

g. The shaft of the pump and motor should be a continuous, uninterrupted shaft, with the pump shaft being an extension of the motor shaft. Couplings are not acceptable.

h. The upper bearing should be a single row ball bearing. The lower bearing should be a double row radial thrust bearing, used for bearing radial forces and axial thrust. The bearings' moreThe small unit has a working life of 100,000 hours.

i. The lower bearing should be equipped with a thermosensitive detector to monitor the bearing temperature. The detector must be in direct contact with the thrust bearing housing. If the temperature rises, the detector will trigger an alarm and stop the pump.

Each pump should be equipped with a double independent mechanical seal system, with the lower seal separated from the impeller hub. The mechanical seal must operate within the oil cavity, which lubricates the overlapping seal surfaces at a steady flow rate. The mechanical seal should be able to operate normally in both clockwise and counterclockwise directions without damaging or losing any seal elements, and without requiring maintenance or adjustment.

k. The mixed liquid recirculation pump is mainly composed of a impeller, submersible motor, self-coupling system, check valve at the outlet, short pipe, guide rod, and lifting device, with its design ensuring the pump's easy and reliable operation. The pump is mounted on the guide rod for easy lowering. The self-coupling system ensures quick, convenient, and reliable connection to the pool wall piping.

The impeller of the mixed liquid recirculation pump is a self-cleaning spiral propeller blade type. Its structure should ensure maximum utilization without clogging or slag formation, and the blade angle should be selected at a normal value based on the operating conditions.

All mixed fluid recirculation pumps are equipped with imported NSK bearings.

Export Check Valve (including outlet short pipe)

a. The door valve body sealing surface should have approximately 10°The inclination is sealed with a rubber soft seal, connecting to the short pipe flange of the mixed liquid recirculation pump outlet via a flange.

b. The gate valve is equipped with a double-hinged structure, with no casting defects permitted on the valve body and valve plate. Anti-corrosion spray painting is applied to the surface.

c. The resistance of the butterfly valve during export does not affect the normal start-up and operation of the mixing liquid recirculation pump, and it is required that the butterfly valve be leak-proof under the specified reverse water head pressure.

(2) Electric motor

The motor is an induction squirrel-cage motor.

Motor utilizes a design specifically for submersible pumps and capable of continuously pumping water at a temperature of 40°Medium C. To monitor the temperature of each phase winding, a thermosensitive switch should be installed in the stator winding coils. The thermosensitive switch should be connected to the external motor overload protection and connected to the control cabinet.

Motor voltage fluctuation tolerance is 10%, motor designed for 40%°Operating in C environment, and the average temperature rise of the stator winding does not exceed 85°C, a performance sheet that displays torque, current, power factor, input/output power, and efficiency should be provided. The sheet should also include data on start-up and no-load characteristics.

Please provide the signal specifications for each protective sensor of the motor, ensuring the signals can be transmitted to the MCC.

The motor's stator winding must be installed with an over-temperature sensor.

Install leakage prevention sensors to prevent liquid from entering the stator windings.

The water detection device should be installed in the motor's cable junction box.

(3) Cable Entry Seal

The cable entry seal design should be capable of eliminating certain torque to form a waterproof diving seal. Measures should be taken in the cable joint section to prevent air exchange between the cable's internal and external air due to temperature differences. The cable entry seal should ensure ease of cable replacement and should not be sealed with epoxy, silicone, or any other secondary sealing systems.

Cable joint sections should take measures to prevent air exchange between the cable's inner and outer parts due to temperature differences.

Cables should be protected reliably and secured to prevent damage due to water flow impact.

Jiangsu Du'an Environmental Protection Sludge Recirculation Pump Key Parts Material

QJB-W7.5 Wall Penetrating Pump

Wall Penetration Pump Installation Diagram

304 Stainless Steel Sludge Wall-Penetrating Pump

Sludge Recirculation Pump Technical Performance and Structure

(1) General Requirements

Each recirculating pump should be capable of continuous operation, intermittent operation, and resuming operation after a long-term shutdown under full immersion conditions.

b. The pump should be able to withstand reverse due to backflow without causing any damage to the pump.

c. The pump unit, within the designed scope of supply, should be vibration-free, free of cavitation, and operate smoothly. The pump's rotor components should undergo dynamic and static balance tests.

d. The pump housing must have sufficient thickness to withstand all loads, including the hydrostatic test pressure and continuous working pressure.

e. The impeller and pump shaft are keyed and fixed at the end of the shaft with sealing. Locking devices must be used on the impeller and shaft to prevent loosening, whether they are rotating clockwise or occasionally reversing.

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

g. The shaft of the pump and motor should be a continuous, uninterrupted shaft, 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 should be a double row radial thrust ball bearing, designed to withstand radial forces and axial thrust. Its service life is at least 100,000 hours.

i. The lower bearing should be equipped with a thermosensitive sensor to monitor the bearing temperature. The sensor must be in direct contact with the thrust bearing housing. If the temperature rises, the sensor will trigger an alarm and stop the pump.

Each pump should be equipped with a double independent mechanical seal system, with the lower seal separated from the impeller hub. The mechanical seal must operate within the oil cavity, which can lubricate the overlapping sealing surfaces at a stable flow rate. The mechanical seal should be able to operate normally in both clockwise and counterclockwise directions without damaging or losing any sealing elements, and without requiring maintenance or adjustment.

k. The mixed liquid recirculation pump is mainly composed of a impeller, submersible motor, self-coupling system, check valve and short pipe, guide rod, and lifting device, etc. Its design should ensure the pump's easy and reliable operation. The pump is mounted on the guide rod for easy placement. The self-coupling system ensures quick, convenient, and reliable connection to the pool wall piping.

The impeller of the mixed-liquid recirculation pump is a self-cleaning propeller blade type impeller. Its structure should ensure maximum utilization rate, with no blockage or slagging. The blade angle should be selected at the normal value based on the operating conditions.

All mixed liquid recirculation pumps are equipped with imported NSK bearings.

Export Check Valve (inclusive of outlet short pipe)

The door valve body sealing surface should have an approximate 10° inclination, utilize rubber soft sealing to prevent water leakage, and be connected to the short pipe flange of the mixture回流 pump outlet via a flange.

b. The gate valve is equipped with a double-hinged structure, and there must be no casting defects on the valve body and valve plate. The surface is treated with anti-corrosion spray.

c. The resistance of the export flap door does not affect the normal start-up and operation of the mixed liquid recirculation pump, and it is required that the flap door be leak-proof under the given reverse head pressure.

(2) Electric Motor

The motor is an induction squirrel-cage motor.

The motor is designed specifically for submersible pumps and can continuously pump a medium at a temperature of 40°C. To monitor the temperature of each phase winding, a thermal switch should be installed in the stator winding coils. The thermal switch should be connected to the external motor overload protection and connected to the control cabinet.

The motor allows a voltage fluctuation of 10%. It is designed to operate in a 40°C environment, with the average temperature rise of the stator windings not exceeding 85°C. A performance chart showing torque, current, power factor, input/output power, and efficiency should be provided. This chart should also include data on starting and zero-load characteristics.

Please provide the signal specifications for each protective sensor of the motor, ensuring the signals can be transmitted to the MCC.

The stator winding of the motor must be equipped with an over-temperature sensor.

Install leakage prevention sensors to prevent liquid from entering the stator windings.

The water detection device should be installed in the motor's cable junction box.

Cable entry seal

The cable entry seal design should be capable of eliminating a certain amount of torque to form a waterproof submersible seal. Measures should be taken in the cable joint section to prevent air exchange between the cable's internal and external air due to temperature differences. The cable entry seal should ensure ease of cable replacement and should not be sealed with epoxy, silicone, or other secondary seal systems.

Cable joint sections should take measures to prevent air exchange between the inner and outer cables due to temperature differences.

Cables should be protected reliably and secured to prevent damage due to water impact.

Jiangsu Du'an Environmental Protection Sludge Recirculation Pump Key Components Material