Electric motor

The motor provides the mechanical power to run the pump impeller. It is the drive that converts the electrical energy supply into mechanical energy to rotate the pump impeller. The electric motor consists of a rotor, stator, commutator, and shaft sleeve. It also has two types of windings: stator and rotor windings. The motor winding is wires placed within coils and enclosed in coated soft iron magnetic core to produce magnetic poles when the current flow in them. Electric motors can be powered using AC or DC. DC derives from batteries while AC comes from power grids, generators, and inverters.

Close coupling

A splitting sewage pump consists of a close coupling between the motor and the rotor. The purpose of the coupling is to transmit torque from the motor to the rotor assembly. In a close coupling, the impeller is directly mounted on the motor shaft and the pump casing is bolted to the drive end of the motor, instead of being installed on a pump bearing frame. A close coupling is simple to design and it does not need alignment, or a separate base plate since it comprises only a single shaft.

Volute (casing)

The volute is the curved casing that receives the fluid. It houses the pump’s internal complement. Including the impeller and shaft. It also features a suction inlet where the water enters and a discharge outlet from which the water exits. The volute also directs the fluid out of the pump through the delivery pipe. When the pumping fluid enters the volute, its flow rate decreases while the pressure increases. The volute is also sealed to prevent leakage and retain pressure

Impeller

The impeller is the component containing a series of backward-curved vanes and is usually placed inside the volute and mounted on the pump shaft. Its function is to increase both the kinetic energy and pressure of the fluid. As the impeller rotates, it transfers the kinetic energy derived from a source, i.e., an electric motor, to the fluid, thereby increasing the fluid pressure and inducing fluid flow. The impeller design is a significant factor in determining the pump’s efficiency. Splitting sewage pump manufacturers produce two types of impellers have two types: Axial flow impeller and Radial flow impeller. The fluid flows axially to the pump shaft in axial impellers, while in a radial impeller, the fluid moves perpendicularly to the post. Axial impellers primarily apply for high-flow and low-pressure applications. On the other hand, radial impellers find use in multistage split-case centrifugal pumps.

Mechanical seals

The purpose of mechanical seals is to reduce leakage between the rotating shaft and the stationary pump casing. Two seal faces or surfaces maintain contact at a sealing interface. One seal face rotates with the shaft while the other one is stationary. Mechanical seals in a splitting sewage pump consist of four main components: the first face, second pages, actuation, and the drive i.e., the motor. The primary seal face rotates with the pump shaft and is embedded in the pump casing. It is usually made from tungsten carbide, silicon carbide, or ceramics. The second face is normally stationary. The mechanical seal sits inside the seal cover plate with the stationary surface pressing against the cover plate and the other one rotating with the shaft. This configuration creates a watertight barrier that prevents leakage through the motor.

Motor capacitor

The motor capacitor stores electrical energy and releases it to the copper windings, creating an extra boost and increasing the motor torque. The splitting sewage pump manufacturers specify a motor capacitor based on several parameters such as capacitance, physical size, voltage rating, frequency, and operating temperature.

Suction inlet and discharge outlet

The fluid enters the splitting sewage pump through the suction inlet and exits through the discharge outlet.