Submersible sewage pumps are integrated units where the pump and motor are combined, and they operate submerged in the liquid. Compared to horizontal or vertical sewage pumps, submersible pumps offer several clear advantages. First, their compact design saves space. Since these pumps can be directly installed in the wastewater tank, there's no need for a separate pump room, which significantly reduces land use and infrastructure costs. Second, installation and maintenance are easier. Small models can be placed freely, while larger ones often come with automatic coupling systems, making setup and servicing more convenient. Third, they can run continuously for long periods. Due to their coaxial structure, shorter shafts, and lighter rotating parts, the radial bearing load is lower, leading to a longer service life than standard pumps. Fourth, they avoid cavitation damage and issues related to water irrigation, making them more reliable and user-friendly. Fifth, they produce less vibration and noise, and keep the motor temperature low, contributing to a cleaner and safer environment.
Because of these benefits, submersible sewage pumps have gained widespread attention and are now used in various applications—from transporting fresh water to handling domestic sewage, industrial wastewater, construction site drainage, and even liquid feed. They play a crucial role in municipal engineering, industries, hospitals, buildings, restaurants, and water conservancy projects.
However, every system has its challenges. The main issue with submersible sewage pumps is reliability. These pumps operate underwater, dealing with a mixture of solids and liquids, and the motor is close to the pump. Their vertical layout means that the weight of the rotating parts and impeller pressure act in the same direction, increasing stress on components like seals, bearings, and the motor. As a result, submersible pumps require higher standards in sealing, motor capacity, and bearing selection compared to regular sewage pumps.
To improve performance and longevity, most manufacturers now include protection systems that detect leaks, overloads, and overheating, triggering alarms or automatic shutdowns. While this helps, it’s a reactive approach. A better solution is to address the root causes—improving sealing, overload resistance, and overall design from the start.
Our approach includes two key technologies: the secondary impeller hydrodynamic sealing system and no-overload design. The secondary impeller, mounted on the back of the main impeller, rotates in the opposite direction. This creates centrifugal force that reduces mechanical seal pressure and prevents solid particles from entering the friction area, thus extending the seal’s life. It also helps balance axial forces, reducing bearing wear. Although it consumes about 3% of the energy, proper design minimizes this loss.
The no-overload design ensures that the power curve rises slowly with flow rate, ideally forming a hump-shaped curve. This allows the motor to handle the full range of flow without exceeding its rated power, preventing overloads and improving reliability. With this design, motor size can be optimized, saving costs and simplifying both selection and operation. Overall, these innovations make submersible sewage pumps more durable, efficient, and suitable for a wide range of demanding applications.
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