原文：
污水处理中螺杆泵的选型和使用技巧： 螺杆泵因其有可变量输送、自吸能力强、可逆转、能输送含固体颗粒的液体等特点，在污水处理厂中，广泛地被使用在输送水、湿污泥和絮凝剂药液方面。螺杆泵选用应遵循经济、合理、可靠的原则。如果在设计选型方面考虑不周，会给以后的使用、管理、维修带来麻烦，所以选用一台按生产实际需要，合理可靠的螺杆泵既能保证生产顺利进行，又可降低修理成本。 一、选择螺杆泵的转速： 螺杆泵的流量与转速成线性关系，相对于低转速的螺杆泵，高转速的螺杆泵虽能增加了流量和扬程，但功率明显增大，高转速加速了转子与定子间的磨耗，必定使螺杆泵过早失效，而且高转速螺杆泵的定转子长度很短，极易磨损，因而缩短了螺杆泵的使用寿命。通过减速机构或无级调速机构来降低转速，使其转速保持在每分三百转以下较为合理的范围内，与高速运转的螺杆泵相比，使用寿命能延长几倍。 二、考虑螺杆泵的品质： 现在市场上的螺杆泵的种类较多，相对而言，进口的螺杆泵设计合理，材质精良，但价格较高，服务方面有的不到位，配件价格高，订货周期长，可能影响生产的正常运行。国内生产的大都仿制进口产品，产品质量良莠不齐，在选用国内生产的产品时，在考虑其xxx的时候，选用低转速，长导程，传动量部件材质优良，额定寿命长的产品。 三、确保杂物不进入泵体： 湿污泥中混入的固体杂物会对螺杆泵的橡胶材质定子造成损坏，所以确保杂物不进入泵的腔体是很重要的，很多污水厂在泵前加装了粉碎机，也有的安装格栅装置或滤网，阻挡杂物进入螺杆泵，对于格栅应及时清捞以免造成堵塞。 四、避免断料： 螺杆泵决不允许在断料的情形下运转，一经发生，橡胶定子由于干摩擦，瞬间产生高温而烧坏，所以，粉碎机完好，格栅畅通是螺杆泵正常运转的必要条件之一，为此，有些螺杆泵还在泵身上安装了断料停机装置，当发生断料时，由于螺杆泵其有自吸功能的特性，腔体内会产生真空，真空装置会使螺杆泵停止运转。 五、保持恒定的出口压力： 螺杆泵是一种容积式回转泵，当出口端受阻以后，压力会逐渐升高，以至于超过预定的压力值。此时电机负荷急剧增加。传动机械相关零件的负载也会超出设计值，严重时会发生电机烧毁、传动零件断裂。为了避免螺杆泵损坏，一般会在螺杆泵出口处安装旁通溢流阀，用以稳定出口压力，保持泵的正常运转。 　　

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译文：
Wastewater Treatment Selection and use of screw tips: Screw because there can be variable transmission, self-priming capability, and can be reversed to transport the liquid containing solid particles, etc., in wastewater treatment plant, widely used in the transportation of water, wet sludge and liquid flocculant side. Screw pump used should follow the economic, rational and reliable principle. If the selection of areas in the design of ill-considered, would later use, management, maintenance, trouble, so choose one according to the actual needs of production, reasonable and reliable screw pump can guarantee the smooth progress of production, but also reduce the repair costs . A selected screw speed: Screw pump flow and speed into a linear relationship between the screw relative to the low speed and high speed screw pump could increase the flow and head, but significantly increased power, high-speed accelerated between the rotor and the stator wear, premature failure will make screw pump, and high speed screw pump rotor length is very short, easy to wear, and thus shorten the life of the screw pump. Through the reduction gear to reduce speed or stepless speed regulation body, to speed to keep the following in each sub-300 switch to a more reasonable range, and high-speed operation of the screw than life can be extended several times. Second, considering the quality of screw pump: Now the type of screw pump on the market more, relatively speaking, the screw pump designed imported, material well, but the price is high, services, and some are not in place, fitting high price, order cycle length, may affect the production normal operation. Most of the domestic production of imported generic products, product quality varies greatly, in the selection of domestically produced product, when considering its cost, use low speed, long-lead, high transmission capacity component material, rated long life products. Third, to ensure that debris does not enter the pump: Wet sludge mixed with the solid debris will screw the rubber material damage to the stator, so to ensure that debris does not enter the pump chamber is very important, many wastewater treatment plant before the installation of a grinder in the pump, and some install grid device or filter, blocking debris into the pump, the grid should be clear winners in time to avoid congestion. Fourth, to avoid breaking material: Screw must not be allowed in the case of blanking operation, upon occurrence of the stator as dry friction of rubber, produces instant heat and burn, so good grinder, screw grille flow is a necessary condition for normal operation To this end, some screw pump body is also expected to stop off device installed, when there Fracture, because he has a self-priming screw pump function of the characteristics of the body will produce a vacuum chamber, vacuum screw pump will stop operation. Fifth, maintain a constant outlet pressure: Screw pump is a positive displacement rotary pumps, when the exit delay after the pressure will gradually increase, so that the pressure exceeds a predetermined value. At this point a sharp increase in motor load. Transmission machinery-related parts of the load will exceed the design value, and in severe electrical burn occurs, transmission parts break. To avoid damage to screw pump, usually installed in the screw pump bypass relief valve outlet, the outlet pressure to stabilize and maintain the normal operation of the pump.