Instructions for using sludge screw pump

1. Selection of Speed for Sludge Screw Pump

The flow rate and speed of a sludge screw pump are linearly related. Compared to low-speed sludge screw pumps, high-speed sludge screw pumps can increase flow rate and head, but their power is significantly increased. High speed accelerates the wear between the rotor and stator, which inevitably leads to premature failure of the screw pump. Moreover, the length of the stator and rotor of high-speed screw pumps is very short, which is prone to wear and tear, thus shortening the service life of the sludge screw pump.

By using a reducer or a continuously variable speed mechanism to reduce the speed and keep it within a reasonable range of less than 300 revolutions per minute, the service life can be extended several times compared to high-speed screw pumps.

2. Avoid material breakage

The sludge screw pump is never allowed to operate under the condition of material breakage. Once it occurs, the rubber stator will instantly generate high temperature due to dry friction and burn out. Therefore, the integrity of the crusher and the smoothness of the grille are necessary conditions for the normal operation of the sludge screw pump. Therefore, some sludge screw pumps also install a material breakage shutdown device on the pump body. When material breakage occurs, due to the self-priming function of the sludge screw pump, a vacuum will be generated in the chamber, and the vacuum device will stop the operation of the sludge screw pump.

3. Maintain a constant outlet pressure

The sludge screw pump is a type of positive displacement rotary pump. When the outlet end is blocked, the pressure gradually increases to exceed the predetermined pressure value. At this point, the motor load increases sharply. The load on transmission machinery related components may also exceed the design value, and in severe cases, motor burnout and transmission component fracture may occur. In order to avoid damage to the screw pump, a bypass overflow valve is usually installed at the outlet of the screw pump to stabilize the outlet pressure and maintain the normal operation of the pump.

4. Ensure that debris does not enter the pump body

The solid impurities mixed in wet sludge can cause damage to the rubber stator of the sludge screw pump, so it is important to ensure that the impurities do not enter the pump chamber. Many sewage treatment plants have installed crushers in front of the pump, and some have installed grid devices or filters to prevent impurities from entering the screw pump. The grid should be cleaned up in a timely manner to avoid blockage.