Screw pump flow and speed into a linear relationship, relative to the high speed screw pump can increase the flow and lift, but the power was significantly increased, high speed accelerated wear and tear between the rotor and stator, screw pump will inevitably lead to failure, And high speed screw pump stator length is very short, easy to wear, thus shortening the life of the screw pump. Through the speed reducer or stepless speed regulating mechanism to reduce the speed, the speed maintained at a reasonable range of three hundred revolutions per minute, and high-speed operation of the screw pump, the service life can be extended several times. Screw pump is never allowed to run in the case of broken material, once occurred, the rubber stator due to dry friction, instantaneous heat generated and burned, so the grinder intact grille smooth is one of the necessary conditions for the normal operation of the screw pump is This, some screw pump is still installed in the pump body off the device, the cavity will have a vacuum, the vacuum pump will stop the pump operation. Screw pump is a positive displacement rotary pump, when the outlet is blocked, the pressure will gradually increase, so that the pressure exceeds the predetermined value. At this time the motor load increased dramatically. Transmission machinery related parts load will exceed the design value, severe motor burn occurs, the transmission parts broken. In order to avoid damage to the screw pump, generally installed at the outlet of the screw pump bypass relief valve to stabilize the outlet pressure to maintain the normal operation of the pump. Now on the market more types of screw pumps, relatively speaking, the imported screw pump design, excellent material, but the higher prices, some services are not in place, parts prices, ordering a long period of time, may affect the normal production run. Because of its variable pump delivery, self-priming ability, reversible, capable of conveying liquids containing solid particles and other characteristics of the sewage treatment plant, is widely used in the transport of water, sludge and flocculant liquid chemical . Screw pump selection should follow the economic, reasonable and reliable principles. If the design selection of ill-considered, will give future use, management, maintenance trouble, so choose a production according to actual needs, reasonable and reliable screw pump can ensure the smooth production, but also reduce repair costs.
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