螺杆泵的选用方法
A reasonable choice of method of screw pump
一、螺杆泵的转速选用
1, screw speed selection
螺杆泵的流量与转速成线性关系，相对于低转速的螺杆泵，高转速的螺杆泵虽然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。
Screw pump flow and speed into a linear relationship, compared to the low speed of the screw pump, high-speed pumps can increase the traffic and although the head, but obviously increased power, high-speed accelerated between the rotor and stator wear, will enable screw premature failure, and high speed screw pump stator and rotor length is very short, easy to wear, thereby shortening the life of the screw pump.
通过减速机或无级调速机构来降低转速，使勘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。
Stepless speed reducer, or by institutions to reduce the speed, so that exploration and speed maintained at 300 per minute switch to a more reasonable under the context of the screw pump and high-speed operation than the lifetime can be extended several times.
二、螺杆泵的品质
Second, the quality of screw pump
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。
Now the types of pumps on the market more, relatively speaking, imports of screw-designed, excellent materials, but the price higher, services, and some are not in place, accessories high price, order-cycle length, may affect the production of the normal operation.
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，在考虑其性价比的时候，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。
Most of the domestic production of generic imported products, product quality varies greatly, in the selection of domestically produced products, taking into account their cost when the choice of low-speed, long lead, driving the amount of the fine material components, rated long life products.
三、确保杂物不进入泵体
Third, to ensure that debris does not enter the pump body
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。
Wet sludge mixed with the solid debris will screw pump stator rubber material damage, so make sure debris does not enter the pump cavity is very important, and in many wastewater treatment plant before the installation of a grinder in the pump, while others are installation of grid device or filter to block debris into the screw for the grill should be prompt settlement of fishing in order to avoid congestion.
四、避免断料
Fourth, to avoid the broken material
螺杆泵决不允许在断料的情形下运转，一经发生，橡胶定子由于干磨擦，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。
Screw does not allow for the case of run-off materials, once occurred, rubber stator due to dry friction, the heat generated instantly burned, so grinder intact, grille flow is a necessary condition for the normal operation of pumps, one of To this end, some screw pump is also installed in the body break down plant material, as occurs when the material off, because he has a self-priming pumps feature the characteristics of the body will produce a vacuum chamber, vacuum devices will screw pump to stop operation.
五、保持恒定的出口压力
maintaining a constant outlet pressure
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。
Screw pump is a positive displacement rotary pumps, when the export side blocked after, the pressure will gradually increase, so that the pressure exceeds a predetermined value. At this time motor load increased dramatically. Transmission machinery-related parts of the load will exceed the design value, and in severe electrical burn occurs, transmission parts breakage. In order to avoid screw pump is damaged, usually installed in the screw pump bypass relief valve outlet to a stable outlet pressure, keep the pump running. |
