Submersible Sewage Pumps

Structure and Working Principle

• Structure: The motor and pump are integrated into a single unit. The motor is powered via a cable, while the impeller and pump body are typically made from wear-resistant and corrosion-resistant materials.
• Working Principle: The motor drives the pump impeller to rotate, creating centrifugal force that draws in and discharges sewage.

Key Characteristics

• Advantages:
  • They have a compact structure and small footprint, allowing direct installation in sewage tanks without the need for a dedicated pump room.
  • Installation and maintenance are convenient: small models can be installed freely, while large ones come with automatic coupling devices.
  • They support long continuous operation. Since the pump and motor are coaxial, the shaft is short, rotating components are lightweight, and the bearing load is low.
  • They eliminate issues like cavitation damage and the need for priming.
• Disadvantages:
  • As they operate underwater and transport media containing solid materials, and given that the pump is close to the motor with a vertical arrangement, they have higher requirements than ordinary sewage pumps in terms of sealing, motor load capacity, bearing arrangement, and component selection.

Scope of Application

• Industrial Applications: Suitable for factories, mines, and other sites, they can discharge industrial wastewater, mine sewage, etc. They are widely used in industries such as chemical engineering, petroleum, pharmaceuticals, mining, papermaking, cement plants, steel mills, and power plants to transport granular sewage and pollutants.
• Municipal Engineering: They can be used in drainage systems of urban sewage treatment plants, municipal drainage projects, construction site drainage, and more.
• Civil Buildings: Ideal for sewage drainage stations in residential areas, hospitals, hotels, and sewage discharge from high-rise buildings, among others.
• Other Applications: They can also be utilized in civil air defense system drainage stations, rural biogas digesters, farmland irrigation, and water supply devices in waterworks, etc.

Precautions

• If the humidity or temperature sensor alarms, or if the pump body vibrates, noise is abnormal, output water volume/pressure drops, or power consumption increases significantly, shut down the pump immediately for maintenance.
• A submersible pump with poor sealing, if immersed in water for a long time, may see a drop in insulation value. If conditions allow, keep it as a dry standby outside the tank.
• Submersible pumps should not be started or stopped too frequently, as this can shorten their service life.