WQ Type Large-diameter Submersible Sewage Pump

The WQ type large-diameter submersible sewage pump belongs to the large-flow branch of non-blocking submersible sewage and waste water pumps. It is the most typical "sitting at the bottom of the well and taking over the shift" pump type used in urban drainage, sewage treatment plants, municipal pump stations, underground drainage systems of large buildings, and industrial and mining rainwater/wastewater systems.

Thickened pump casing
Aesthetically pleasing, well-designed, with fast cooling, extending the service life of the motor Thickened base
Thickened base for greater stability and safer use
Comfortable handle
Anti-slip design, resistant to corrosion and friction 

Motor Section - Dry sealed, cooled by water, survives by sealing
The motor is a three-phase asynchronous submersible motor
Heat dissipation logic: The motor housing is directly immersed in water, and the pool water removes the dissipated heat - this requires that the minimum liquid level cannot be too low
Sealing and oil chamber
Two parallel mechanical seals (one towards the medium side and one towards the motor side), the sealing surface materials are commonly tungsten carbide/silicon carbide/hard alloy pairs, the entire component is lubricated and cooled in the sealing oil chamber.
Oil-water probe (leak detection sensor): Installed in the oil chamber, once the first mechanical seal has a slight leakage causing the oil to emulsify and enter the water, the probe signal is sent to the control cabinet for alarm/shutdown to prevent water from continuing to seep into the motor - this is "pre-emptive diagnosis" rather than "only realizing it after it's burned out".
Pre-installed thermal sensitive elements (PTC/PT100) in the stator winding: Overheating → control cabinet protection action; at the same time, it is equipped with multiple protections such as leakage, electric shock, overload, phase loss, and under-voltage.
Pump Section - The large flow channel impeller is the true "no blockage" ability
Single flow channel impeller: The flow channel cross-section is close to the cross-section of a bent pipe, it can pass through solid blocks of approximately the size of the pump's diameter, fibers are not easily tangled - this is the most common choice for large-diameter municipal models.
Double flow channel/double blade structure: Two "half blades" form two large channels, balancing efficiency and passability, more suitable for urban sewage containing certain lengths of fibers.
Anti-block design indicators (industry standard description): It can pass through fibers of approximately 5 times the pump's diameter and solid particles of approximately 50% of the pump's diameter (in practice, it is based on the specific channel width and cutting gap of each factory's hydraulic model).

Submerged operation: The electric pump is completely submerged in the sump/pump station well/regulator tank, with the liquid level higher than the suction section of the pump body. The water is drawn into the impeller through the bottom or side of the pump body and passes through the grille.
Impeller work: The sewage passes through the large flow channel single-flow channel or double-flow channel impeller (there are also variants with single-blade/double-blade open structure) to obtain energy, enters the conical discharge chamber, and the kinetic energy is converted into pressure energy, and is discharged from the side/top outlet flange into the vertical drainage pipe.
Level control: The float switch or liquid level probe gives the start/stop signal → the control cabinet executes → multiple pumps can alternate/standby operation, achieving unmanned operation.

Municipal/Urban Sewage
Inlet pump houses of sewage treatment plants, intermediate lift pumping stations, diversion pumping stations, and combined rain and sewage overflow pumping stations; Large-diameter machines are responsible for "lifting and sending away the thousands of tons or tens of thousands of tons of dirty water in the city every day"
Underground drainage of large buildings
Drainage of collection pits in high-rise buildings, complexes, subway stations, and underground transportation hubs - when the flow is extremely large during heavy rain, the smaller diameter will directly overflow
Rainwater drainage and flood control
Flood drainage pumping stations in low-lying urban areas, collection pools in tunnels/underpass roads - Large-diameter WQ relies on "large channels not being overloaded and not getting stuck" to withstand the peak of heavy rain
Industrial wastewater
Pre-treatment stations for food, paper, and chemical parks, combined lifting of stormwater and process wastewater, with more fibers/organic debris but lower abrasiveness than slurry
Water conservancy projects/pump station renovation
When replacing old pump stations, use large-diameter WQ + automatic coupling instead of old long-axis submersible pumps or ground dry-type pumps + packing seals. The civil engineering changes are minimal

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