- choose screw vacuum pump in the sewage treatment

screw vacuum pump with their large conveying variable, strong self-priming capacity, reversibility and the ability to handle liquid containing solid particles, is widely used in sewage treatment plants conveying water, wet sludge and liquid of flocculant. Screw vacuum pump selection should follow the principle of economic, reasonable and reliable. If you don't consider carefully design and type selection, will be trouble for later use, management and maintenance. Therefore, according to the actual production need to choose reasonable and reliable screw vacuum pump, can not only ensure production run smoothly, also can reduce the maintenance cost.

a, screw vacuum pump speed choice

a linear relationship with screw vacuum pump flow and speed. Compared with the low speed screw vacuum pump, high speed screw vacuum pump can increase the flow head, but power increased significantly. Between high speed accelerated the rotor and stator, wear and tear, this will lead to premature screw vacuum pump failure. In addition, the high speed screw vacuum pump rotor fixed length is very short, easy to wear and tear, thus shortening the service life of the screw vacuum pump.

by retarding mechanism or reduce the speed stepless speed regulation institutions, keep the speed under 300 revolutions per minute within a reasonable range, longer service life than high speed screw vacuum pump for several times.

2, the quality of the screw vacuum pump

there are many kinds of screw vacuum pump in the market now. Relatively speaking, imported screw vacuum pump design is reasonable, good materials, but the price is relatively high. Some services, accessories price is high, the order cycle is long, may affect the normal running of production. China produces most of the products are imported products are imitations, product quality is uneven. When choosing products made in China, given their price, choose low rotational speed, long long lead, excellent driving part and the rated life of the product.

3, ensure the pieces into a pump body is not

in the wet sludge mixed with solid impurities can damage the screw pump stator rubber material, so to ensure impurities are not to enter in the pump chamber is very important. Many sewage treatment plants in front of the pump is equipped with mill, some with a grating device or filter, with impurities into the plug screw vacuum pump. Should be timely clean grille, lest jam.

4, avoid cutting materials

screw vacuum water pump must not be allowed under the condition of the material to cut off the operation. Once this happens, the screw vacuum pump outlet rubber stator will burn out due to dry friction and instantaneous high temperature. Therefore, complete crusher and smooth grid is one of the necessary conditions for normal operation of screw vacuum pump. As a result, some screw vacuum pump is equipped with material cutting and closing device. When material cutting, due to the screw vacuum pump self-priming function, inside the cavity will create a vacuum, vacuum unit will stop the operation of screw vacuum pump.

5, constant outlet pressure

injection screw vacuum pump is a kind of positive displacement rotary pump. When the outlet is blocked, the pressure will gradually rise, more than a predetermined pressure value. At this point, the motor load has increased dramatically. Mechanical transmission load of related components will also be more than design value. In serious cases, the electricity to burn out, driving part will be damaged. In order to avoid damaging the screw vacuum pump, usually in the installation of a by-pass screw vacuum pump outlet relief valve, to stabilize the outlet pressure and maintain the normal operation of the pump.

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