Duwan Environmental Equipment (Jiangsu) Co., Ltd

Wall Penetrating Pump Installation Dimensions

Duwan Environmental QJB-W7.5 Wall Penetrating Sludge Pump Price

DivingRecirculating Pump (Through-the-Wall Pump)

Design, manufacturing, and factory testing technical requirements for recirculating pumps (through-the-wall pumps).

Design Requirements

Duwan Environmental Wall Penetrating Pump, Sludge Recirculation PumpTechnical Performance and Structure

（1) General Requirements

each unitRecirculationThe 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 designed scope of supply, should operate without vibration, cavitation, and run smoothly. The pump's rotor components should undergo dynamic and static balance tests.

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

e. The impeller and pump shaft are keyed and secured at the shaft end, 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 shall 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 bearing, used to bear radial forces and axial thrust. The bearings of itsPlease provide the Chinese content that needs to be translated into American English.Small work life100,000 hours.

i. The lower bearing should be equipped with a thermal sensor to monitor 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 lubricates the overlapping seal surfaces at a stable flow rate. The mechanical seal should operate normally in both clockwise and counterclockwise directions without damaging or losing any seal components, and without requiring maintenance or adjustment.

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

The impeller of the mixed liquid recirculation pump is a self-cleaning propeller blade impeller. Its structure should ensureMaximizeFlow rate is smooth without clogging or slagging; the blade angle should be selected according to the operating conditions.NormalValue.

All mixed liquid recirculation pumps are equipped withImportedNSK Bearings。

Export Swing Check Valve (inclusive of outlet short pipe)

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

b. The gate valve is designed with a double-hinged structure, with no casting defects allowed on the valve body and valve plate. Surface corrosion protection coating is applied.

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

（2) Electric Motor

The motor is an induction squirrel-cage motor.

Motors are designed specifically for submersible pumps and capable of continuously pumping at temperatures of40°Medium 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 for voltage fluctuations of10%, motor design at 40%°Operate under C environment, and the average temperature rise of the stator winding does not exceed 85.°C, a performance sheet should be provided that displays torque, current, power factor, input/output power, and efficiency. This performance sheet should also include data on startup and no-load characteristics.

Please provide the signal specifications for each protective sensor of the motor to ensure signal transmission.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 a certain amount of torque to form a waterproof diving seal. Measures should be taken in the cable joint section to prevent air exchange between the internal and external air of the cable due to temperature differences. The cable entry seal should ensure ease of cable replacement; it cannot be sealed with epoxy, silicone, or any other secondary sealing system.

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

Cables should be protected reliably and securely fastened to prevent damage from water flow impact.

Jiangsu Du'an Environmental Protection Sludge Recirculation PumpKey components materials