Select screw vacuum pump

The dry screw vacuum pump is widely used in the sewage treatment plant to transport water, wet sludge and flocculant drug liquid because of its characteristics of variable transport, strong self-priming ability, reversible and capable of conveying liquid containing solid particles. How to choose dry screw vacuum pump correctly in sewage treatment? Screw pump selection should follow the principle of economy, reasonable, reliable. If in the design of the selection of consideration, will bring trouble to the use, management, maintenance, so choose a production according to the actual needs, reasonable and reliable screw pump can ensure the smooth production, and can reduce the cost of repair.

How to choose dry screw vacuum pump correctly in sewage treatment? You can choose from the following five aspects.

1.  screw vacuum pump speed selection

A linear relationship with screw pump flow rate and rotational speed, low relative to the rotating speed of screw pump, high rotational speed of screw pump, can increase the flow and head but power obviously increase, high speed accelerate the abrasion between the rotor and stator, must make the premature failure of screw pump, and the high speed of the screw pump stator length is short, easy to wear and tear, thus shortening the service life of the screw pump.

Through the deceleration mechanism or stepless speed control mechanism to reduce the speed, so that the speed kept in a reasonable range of 300 revolutions per minute, compared with the high-speed operation of screw pump, service life can be extended several times.

2.  screw vacuum pump of quality

Now in the market is more, the kinds of screw pump, in contrast, imports of screw pump design is reasonable, the material is excellent, but the price is higher, the service aspect some do not reach the designated position, accessories price is high, the order cycle is long, may affect the normal running of production. Domestic production of generic mostly imported products, product quality is good and bad are intermingled, when choosing the products of the domestic, considering its cost-effective, choose low rotation speed, long lead, transmission quantity of parts material is good, rated life long product.

3.  to ensure that the debris does not enter the pump body

Wet sludge mixed with solid debris will cause damage to the rubber stator screw pump, so to ensure that debris does not enter the vacuum pump chamber is very important, a lot of sewage plants in the vacuum pump before the installation of a crusher, also some installed grille device or filter, block debris into the screw pump, for the grille should be timely dredge to avoid causing blockage.

4. avoid broken material

Screw vacuum pump is never allowed to run in the case of broken feed, once it happens, screw pump outlet pressure rubber stator due to dry friction, instantaneous high temperature and burned out, so, the crusher is intact, the grillage is one of the necessary conditions for normal operation of screw pump, for this reason, some screw pump is also installed in the vacuum pump broken feed stop device, when broken feed, because the screw pump has the characteristics of self-absorption function, cavity will produce a vacuum, vacuum device will make screw pump stop operation.

5. maintain a constant outlet pressure

Screw pump is a kind of positive displacement rotary pump, when after the outlet is blocked, the pressure will gradually rise, so that more than a predetermined pressure value. At this point the motor load increases sharply. The load of the related parts of the driving machinery will also exceed the design value, and the motor will be burnt and the driving parts will be broken. In order to avoid screw pump damage, generally will be installed in the screw pump outlet bypass relief valve, in order to stabilize the outlet pressure, keep the normal operation of the vacuum pump.

Select screw vacuum pump