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 and reasonable 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. First, the quality of the screw pump Screw pumps now on the market more types, relatively speaking, the imported screw pump design, excellent material, but the higher prices, some services are not in place, parts prices, ordering Long cycle, may affect the normal operation of production. Most of the domestic production of imported products imitation, product quality varies greatly in the choice of domestically produced products, considering its cost-effective time, the choice of low speed, long lead, transmission parts of good quality, long life rating of the product. Second, the speed of the screw pump Selection of the screw pump flow and speed into a linear relationship, relative to the low speed screw pump, screw pump with high speed can increase the flow and lift, but the power increased significantly, high speed accelerated the rotor and Stator wear, the screw will inevitably lead to failure, and high-speed screw rotor rotor 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. Third, to ensure that debris does not enter the wet mud sludge mixed with solid impurities will screw the rubber material stator damage, so to ensure that debris does not enter the cavity of the pump is very important, many sewage treatment plant before the pump Installed a grinder, and some grille installation or filter, blocking debris into the screw pump, grill should be promptly salvaged to avoid clogging. Fourth, to avoid broken screw pump Never 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, smooth grille is necessary for the normal operation of the screw pump One of the conditions, therefore, some screw pump is still installed in the pump body break down device, when there is a broken material, due to the self-priming screw pump has the characteristics of the cavity will produce a vacuum, the vacuum device will stop the screw pump Run. Fifth, to maintain a constant outlet pressure Screw pump is a positive displacement rotary pump, when the outlet end 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. Screw pump Overview :: Screw pump is a single screw pump, which is the main working parts of the eccentric spiral screw (called the rotor) and the inner surface of the double helical screw bush (called stator). Its working principle is that when the motor drives the pump shaft to rotate, the screw rotates on its own axis on the one hand, and on the other hand, it rolls along the inner surface of the liner to form a sealed chamber of the pump. Each revolution of the screw, the liquid in the sealed cavity is pushed forward by one pitch. As the screw rotates continuously, the liquid spirally presses from one sealed cavity to the other sealed cavity, and finally the pump body is extruded. Screw pump is a new type of liquid conveying machinery, with the advantages of simple structure, safe and reliable operation, convenient use and maintenance, continuous and uniform liquid discharge, and stable pressure. The working principle of the screw pump is that when the screw pump is working, the liquid is sucked into the sealed space enclosed by the screw thread and the pump shell. When the driving screw rotates, the screw pump sealing volume increases the pressure of the screw pump under the extrusion of the screw thread, And move in the axial direction. Since the screw is rotating at a constant speed, the flow of liquid out is also uniform.
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