IMO screw pump It has the advantages of variable conveying capacity, strong self absorption capacity, good reversibility, and being able to transport liquids containing solid particles. It is widely used in sewage treatment plants to transport water, wet sludge and flocculant liquids. Screw pump The principle of economy, rationality and reliability shall be followed in the selection of the model. If the design and selection are not well considered, it will bring trouble to the future use, management and maintenance. Therefore, a reasonable and reliable screw pump is selected according to the actual needs of production, which can not only ensure the smooth production, but also reduce the repair cost.

1. Selection of screw pump speed

The flow of screw pump is linear with the speed. Compared with low-speed screw pump, high-speed screw pump can improve the flow and head, but the power is significantly increased. High speed speeds up the wear between the rotor and stator, which will inevitably lead to premature failure of the screw pump. The stator and rotor of high-speed screw pump are very short and easy to wear, thus shortening the service life of the screw pump.

The reducer or stepless speed regulating mechanism decelerates to keep the inspection speed within a reasonable range below 300 revolutions per minute. Compared with high-speed screw pump, the service life can be extended several times.

2. Quality problems of screw pump

There are many kinds of screw pumps on the market at present. Relatively speaking, the imported screw pump has reasonable design and good materials, but the price is high and some services are not up to standard. The price of parts is high and the ordering cycle is long, which may affect normal production. function. Similar products mostly imitate imported products, and the product quality is uneven. When selecting similar products, the products with low speed, long lead, good quality of transmission components and long rated life shall be selected when considering their cost performance ratio. IMO agent

1. Ensure that sundries do not enter the pump body.

Solid debris mixed in wet sludge will damage the rubber stator of screw pump, so it is very important to ensure that debris does not enter the pump cavity. Many sewage plants have installed shredders in front of pumps, and some have also installed grating devices or filter screens to prevent sundries from entering the screw pump. The grating should be cleaned in time to avoid blocking.

2. Avoid material damage.

The screw pump is never allowed to operate under the condition of cutting materials. Once it happens, the rubber stator will be burned out in an instant due to high temperature dry friction. Therefore, the crusher is in good condition and the grid is unblocked. In addition, some screw pumps are also equipped with a cut-off stop device on the pump body. When the material is cut off, due to the self-priming function of the screw pump, vacuum will be generated in the cavity, and the vacuum device will stop the screw pump..

3. Maintain constant outlet pressure.

Screw pump is a positive displacement rotary pump. When the outlet end is blocked, the pressure will gradually increase, making it exceed the predetermined pressure value. At this time, the motor load increases sharply. The load of relevant parts of transmission machinery will also exceed the design value, and in serious cases, the motor will burn out and the transmission parts will break. To avoid damaging the screw pump, a bypass overflow valve is generally installed at the outlet of the screw pump to stabilize the outlet pressure and maintain the normal operation of the pump.