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Knowledge of chemical pumps 2

Knowledge of chemical pumps 1

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Reasonable use of the screw pump when conveying the sewage media

release time:

2022-12-08 10:58

source:

Screw pump is widely used in sewage treatment plants in recommended water, wet sludge and flocculant liquid because of its strong, irreversible and liquid containing solid particles. Screw pump selection should follow the economic, fair and reliable standards. If the thinking in the design and selection is not good, it will bring trouble to the future application, management and maintenance, so choose a screw pump according to the needs of production practice, fair and firm can not only cover the smooth production, but also reduce the repair cost. Now some of our understanding of using the screw pump are shown as follows:

1. Selection of the rotation speed of the screw pump

Screw pump flow and speed into a linear relationship, related to the low speed of screw pump, high speed screw pump can add the flow and head, but the power increases, high speed accelerated between the rotor and stator wear, must make the screw pump early effect, and high speed screw pump rotor length is very short, easy to wear, so shorten the service life of the screw pump.

Through the deceleration mechanism or stepless speed regulating mechanism to reduce the speed, so that the speed adhere to the more reasonable limit below 300 revolutions, compared with the high-speed operation of the screw pump, the service life can be extended several times.

2. Quality of the screw pump

At present, there are many varieties of screw pump on the market. Relatively speaking, the entrance screw pump design is reasonable, the material is excellent, but the price is high, some services are not in place, the price of accessories is high, and the ordering cycle is long, which can affect the normal operation of production. Most of the imitation entry products produced in China, the product quality of the selection of the products produced in China, in the time of thinking about its cost performance, choose low speed, long range, transmission parts with excellent material and long extra life products

3. Ensure that the debris does not enter the pump body

Wet sludge mixed with solid debris will damage the screw pump rubber stator, so to ensure that debris not into the pump chamber is very main, many sewage plant installed before the pump grinder, also some device grille installation or filter, block debris into the screw pump, about the grille should be real-time clear fishing to form infarction.

4. Prevent spotting

Screw pump is not allowed in the firing scene in operation, once ignition, rubber stator due to dry friction, suddenly high temperature and burn, so, the grinder, grille dredging is one of the requirements of the normal operation of screw pump, therefore, some screw pump in the pump device stock stop installation, when firing occurs, because the screw pump has the characteristics of the suction function, cavity, vacuum, vacuum installation will make the screw pump stop operation.

5. Stick to a constant outlet pressure

Screw pump is a kind of volume inversion pump, when the outlet end is blocked in the future, the pressure will gradually increase, so that beyond the predetermined pressure value. At this time, the motor load adds sharply. The load of the related parts of the transmission machinery will also exceed the design value, and the ignition motor will be destroyed and the transmission parts will be broken. In order to prevent the damage of the screw pump, the bypass overflow valve at the outlet of the screw pump is generally used to do not change the outlet pressure and adhere to the normal operation of the pump.

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