In the sewage treatment plant, screw pump is widely used in the transportation of water, wet sludge and flocculant liquid.

The selection of screw pump should follow the principle of economy, rationality and reliability. If inconsiderate in design, would later use, management, maintenance, trouble, so choose one according to the actual needs of production, reasonable and reliable screw pump can ensure smooth production, and can reduce the cost of repairs.

First, screw pump speed selection

Screw pump flow and speed linearly relative to the screw pump, low speed and high speed screw pump could increase the flow and head, but significantly increased power, high speed accelerated between the rotor and the stator wear, premature failure will make screw pump, and high speed screw pump rotor length is very short, easy to wear, and thus shorten the life of the screw pump.

Through the deceleration mechanism or stepless speed regulation mechanism to reduce the speed, so that its speed is maintained at a reasonable range of three hundred rpm, compared with high-speed running screw pump, the service life can be extended several times.

Two, screw pump quality

Many kinds of screw pump in relation to the import of the screw pump design is reasonable, the material is excellent, but the price is high, and some are not in place, accessories high price, order cycle length, may affect the normal operation of production.

Most of the domestic production of generic imported products, product quality is uneven in quality, in the selection of domestically produced product, when considering its cost, use low speed, long lead, high transmission capacity component material, rated long life products.

Three, ensure that debris does not enter the pump body

Wet sludge mixed with the solid debris will rubber material damage to the stator of the screw pump, so to ensure that debris does not enter the pump chamber is very important, many wastewater treatment plant before the installation of a grinder pump, and some install grid device or filter, blocking debris into the pump, the grid should be cleared in time to avoid clogging fishing.

Four. Avoid cutting

The screw pump must not be allowed to operate in cutting conditions, the occurrence of the rubber stator due to dry friction, instant high heat and burn out, so the grinder intact, is one of the necessary conditions of grille unimpeded, normal operation of the screw pump for some screw pump pump body still installed end feeding stop device, when cutting, due to its characteristics of screw pump self-priming function, cavity

The vacuum will occur, and the vacuum pump will stop the screw pump.

Five. Keep constant outlet pressure

Screw pump is a volumetric rotary pump. When the outlet is blocked, the pressure will gradually rise, so that the pressure exceeds the predetermined pressure value. At this point, the motor load increased dramatically. The load of the transmission machinery related parts will exceed the design value, and the motor will burn out and the transmission parts will break in serious condition. In order to avoid the damage of screw pump, the oil return valve is usually installed at the outlet of screw pump

To maintain the normal operation of the pump by stabilizing the outlet pressure.