Wear-resisting centrifugal pump flow control big six method is introduced

So-called wear-resisting centrifugal pump flow control, the actual working point is to change the centrifugal water pump, can through the change of pipeline characteristic curve and the method of the characteristic curve of the pump. According to wear-resisting centrifugal pump characteristic curve can know, as head increased flow drops rapidly, shaft power flow down, slow down. Wear-resisting centrifugal pump flow control six methods are as follows:

1, variable speed adjustment

its principle is by changing the characteristic curve of centrifugal water pump rotating speed to change the pump, thus changes the working point.

as shown in figure, rotate speed of nA, droop of nC, pump performance curve down, working point for C, traffic tailed off, head down.

2, variable diameter adjustment

after turning impeller, pump performance will change according to certain rules, so that the pump point change. We change the cutting impeller pump working point method, called a variable diameter.

3, variable Angle adjustment

change the blade installation Angle change can make the performance of the pump, so as to achieve the aim of changing the point for the pump working condition. The way the change point is called the pump variable Angle adjustment.

4, bypass return adjustment

this adjustment method is to open the bypass valve of the water pump, part of the liquid from the pump discharge pipe to return to the suction pipe, thereby reducing the discharge pipe flow. This method of vortex pump is more appropriate. This is because the vortex pump characteristic curve in reducing traffic head rising sharply, shaft power has increased. Instead of the shaft power when the discharge are down a bit.

5, throttling

for water pipeline installation of gate valve of the pump device, the gate valve off hours, increased the local resistance in the pipeline, the pipeline characteristic curve steepening, the point Q - along the water pump H curve move above to the left. The smaller the gate locked, resistance increases, the greater the flow becomes smaller. This pass the small gate valve to change the pump point method, called the throttling adjustment or valve adjustment.

6, cutting impeller diameter adjustment

car will centrifugal pump impeller diameter is small, can make the performance under the same speed change, can change the head.

below, under the rated speed, the impeller diameter of D2, working point to 1, when the impeller outer diameter is 2 D, pump characteristic curve down, working point to 2, head down.

this method of regulating, and no additional energy loss, is a kind of economic way, but is only applicable to the centrifugal pump in a long time to change into small flow operation is used.

down gate valves, piping local head loss increase, piping system characteristic curve and move to the left above pump working point are also moving to the left. The smaller the gate locked, the local head loss, the greater the flow will be small. Thus throttling not only increase the local head loss, and reduced the water yield, is not the economy. But because of its simple, applied in the small pump device and the water pump performance test.

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