11kW-22kW Structural Diagram (Standard Configuration)

11kW-22kW Structural Diagram (Optional)

Structural diagram for 30kW and above (standard configuration)

Structural diagram for 30kW and above (optional)

I. Innovative Semi-Open Impeller Hydraulic Design for Improved Impedance: The innovative and efficient semi-open impeller hydraulic model design, developed through extensive CFD research, analysis, and testing, achieves an optimal balance between the impeller’s wide flow channel and the pump’s high efficiency. The semi-open impeller’s fewer blades, used in conjunction with an insert ring, features scraping grooves on its inner wall. As the impeller rotates, these grooves actively remove tangled fibers and long debris, reducing the risk of clogging and facilitating the transport of liquids containing impurities. This eliminates concerns about clogging during submersible sewage pump operation.

II. Self-Cleaning Mechanical Seal Technology: Two single-end-face mechanical seals are installed in series. A special spiral groove and small-gap structure design at the pump cover prevents solid particles from depositing on the pump-side mechanical seal, achieving a self-cleaning function and extending the mechanical seal’s service life.

III. Short Shaft Extension Design: The short shaft extension design significantly eliminates shaft eccentricity errors. This lowers the pump’s center of gravity, reduces pump vibration, and extends the life of the mechanical seal and bearings. IV. High Reliability of Submersible Motor
The motor insulation class is H, with a maximum allowable temperature of 180℃, a significant improvement over class F. This allows the motor to withstand higher temperatures and is more durable. The dynamic seal uses a Shanghai Burgmann mechanical seal, with the pump end seal made of silicon carbide-on-silicon carbide or silicon carbide-on-tungsten carbide, providing maximum wear resistance. The mechanical seal is designed for a service life of 15,000 hours. The bearings are designed for a minimum service life of 100,000 hours to ensure normal pump operation.

V. Highly Efficient Motor Cooling (Optional)
A unique closed-loop cooling system is used to cool the motor. The cooling chamber uses a mixture of ethylene glycol and distilled water as a coolant. This mixture flows through an auxiliary impeller. As the coolant flows over the casing surface, it carries away heat from the motor, resulting in faster heat dissipation, lower motor temperature rise, and a longer product lifespan.

VI. IoT-enabled Water Pumps, Smart Control Cabinet, and Cloud-based Remote Monitoring (Optional)

The WQH (30kW and above) series submersible sewage pumps can be equipped with an optional IoT-enabled smart sewage pump featuring a built-in intelligent digital acquisition module (KQCJ01) for real-time acquisition of pump operating data such as winding temperature, bearing temperature, oil chamber leakage, motor chamber leakage, junction box leakage, and pump vibration. This provides comprehensive monitoring of pump operation and allows for real-time data display via a smart control cabinet, as well as automatic alarm or shutdown. Monitoring and maintenance can also be performed by logging into the Shanghai Kaiquan Smart Cloud remote monitoring and maintenance platform.

VII. Diverse Pump Installation Methods
Multiple installation methods are available, including automatic coupling installation. The pump is connected to the outlet pipe via a coupling device, eliminating the need for conventional fasteners. Connecting and disconnecting the pump from the outlet pipe is as simple as lowering or lifting the pump along the guide rod, saving time and effort.

When the pump motor is equipped with a closed-loop cooling system… The water pump can be dry-installed, meaning the pump is completely outside the pumping liquid area. Simply fix the base to the foundation, connect the inlet and outlet pipes, and it’s ready to operate. Even if the pump house is flooded, the pump will not be affected. The cooling chamber contains its own coolant to ensure motor cooling, and future pump inspection and maintenance are convenient. Customers can choose between horizontal or vertical dry-installation depending on the water level in the tank and the size of the pump house.

Pump Body & Impeller

Optimized design using CFD technology, featuring a wide-outlet, high-efficiency semi-open impeller. This achieves an optimal balance between pump efficiency and high throughput, with a wide flow channel for excellent dirt clearance. The impeller undergoes rigorous dynamic balancing testing to minimize vibration and maximize the lifespan of bearings and mechanical seals.

Pump Cover

Designed with self-cleaning technology, the pump cover features an annular spiral groove structure. Media particles are thrown outwards by the centrifugal force of rotation at the cover, preventing particle accumulation within the sealing cavity and achieving a self-cleaning effect for the mechanical seal.

Motor

Specially designed and manufactured submersible motor with an IP68 protection rating. The stator windings have H-class insulation with a maximum operating temperature of 180 degrees Celsius. The 11kW-22kW models incorporate a thermistor in the windings, while the 30kW and above models have an embedded PT100 winding temperature sensor. Over-temperature protection can be provided via the control cabinet.

Motor Cooling (Optional)

The motor is cooled by a unique motor cooling system. The cooling medium flows between the stator housing and the cooling sleeve. The cooling medium is a mixture of ethylene glycol and distilled water, avoiding long-term blockage and scale buildup inside the sleeve, which would affect heat dissipation. Heat exchange occurs between the heat sink on the stator housing and the liquid inside the cooling chamber. The liquid in the cooling chamber then exchanges heat with the ambient gas and the pumping medium at the pump cover. This achieves rapid and efficient motor cooling, ensuring low temperature rise and high reliability. The pumping medium does not need to submerge the motor, allowing for a lower pump stop level. The lowest pump stop level should not be lower than the level marked “▼” on the installation dimension drawing to prevent dry wear damage to the mechanical seal due to lack of lubrication.

Mechanical Seal

A Burgmann mechanical seal is used. The mechanical seal uses low-friction, wear-resistant friction pair materials. The rubber parts are made of nitrile rubber, and the metal parts are made of stainless steel. The media-side mechanical seal uses a silicon carbide/tungsten carbide pair, combined with pump cover self-cleaning mechanical seal technology, providing a continuous service life of 15,000 hours.

Mechanical Seal Bearings

All models are equipped with original imported SKF bearings as standard. The upper bearings are deep groove ball bearings or cylindrical roller bearings, used to withstand radial forces. The lower bearings withstand axial and radial forces. Depending on the magnitude of the radial and axial forces, some pump models are designed with a single double-row angular contact ball bearing, while others use a pair of angular contact ball bearings plus a cylindrical roller bearing. All have sufficient load margins. The bearings are designed for a service life of 100,000 hours and are lubricated with #3 lithium-based grease.

Cables & Motor Sealing

The cables are heavy-duty rubber-sheathed flexible cables resistant to sewage, offering superior mechanical strength and oil resistance. The cable conductor cross-sectional area and current-carrying capacity are selected based on long-term continuous operation at an ambient temperature of 40℃. Therefore, under normal operating conditions, the cable’s current-carrying capacity has sufficient margin, resulting in a longer service life.

The cable gland tightens the cable sealing ring, ensuring a reliable seal between the cable and the wiring cavity. The cable is secured to prevent pull-out. The cables use color-coded markings and digital labels for easier identification and connection. Grounding marks and fasteners are installed in the motor wiring cavity and electrical control cabinet, ensuring strict grounding of cables for safety and reliability.

During the standard water pump assembly process, rigorous sealing tests are conducted on the O-rings, cable seals, and mechanical seals of each pump to guarantee reliable sealing of the motor cavity, oil chamber, and wiring cavity.

When the motor is equipped with a closed-loop cooling circulation system, rigorous sealing tests are conducted on the O-rings, cable seals, and mechanical seals of each pump to guarantee reliable sealing of the motor cavity, circulating coolant chamber, and wiring cavity.

Water Pump Protection Devices

11kW-22kW water pumps are equipped with standard motor winding overheat protection components, motor cavity oil-water probes, and oil chamber leakage probes.

30kW and above water pumps are equipped with standard winding temperature measurement, bearing temperature measurement, junction box leakage protection (frame size 520 and above), motor cavity leakage protection, and oil chamber leakage protection. Vibration monitoring is optional (for 30kW and above, an intelligent digital acquisition module (KQCJ01) is also available as an option).

Leakage Detectors

Leakage detectors are used to detect water ingress into the oil chamber, motor chamber, and junction box chamber (frame size 520 and above).

The leakage detector in the junction box is simply called a water detector. When the O-ring seal between the junction box and the upper cover of the motor is damaged, water will enter the junction box chamber through the gap between them. The incoming water will cause the two electrodes of the detector to conduct, triggering an alarm signal (indicator light) through the control cabinet and automatically stopping the pump, reminding the operator to inspect the pump and prevent further damage from continued operation. The leakage detector in the oil chamber is simply called an oil detector. When the impeller-side mechanical seal is damaged and the water level in the leaking oil chamber reaches a certain level, the two electrodes of the leakage detector will conduct, triggering an alarm signal (indicator light) through the control cabinet, reminding the operator to check the mechanical seal or replace the oil in the oil chamber. The leakage detector in the motor chamber is simply called a water detector. It is installed in the cavity below the motor chamber, next to the bearing, and the cavity has a hole communicating with the bearing chamber. When the mechanical seal on the motor side fails, oil from the oil chamber can enter the cavity through the bearing chamber, or water from the motor can flow into the cavity. This will cause the two electrodes of the leak detector to conduct, triggering an alarm signal (indicator light) through the control cabinet and automatically stopping the pump to alert the operator for maintenance.

Lifting Device

The pump’s lifting frame is made of 304 stainless steel and features ample space for easy hook attachment, ensuring convenient lifting and durability.