Method 1: outlet valve opening adjustment.
In this method, the pump is in series with the outlet pipeline regulating valve, and its actual effect is similar to that of the new pump system. The maximum output pressure of the pump has not changed, but the flow curve has been attenuated.
Method 2: bypass valve regulation.
Valves and pumps in parallel in this approach, its practical effect as adopted a new pump system, the maximum output of the pump head change, flow curve characteristics at the same time also produces change, more close to the linear flow curve.
Method 3: adjust the diameter of impeller.
This method does not use any external components, and the flow characteristic curve varies with the diameter.
Method 4: speed control.
Impeller speed changes directly change the flow curve of the pump. The characteristic of the curve does not change. When the speed decreases, the curve becomes flat, the head and the maximum flow decrease.
The overall efficiency of the pump system increases the loss of pipeline pressure and the efficiency of pump system decreases greatly. The impeller diameter adjustment has little effect on the efficiency of the whole pump system, and the speed control method basically does not affect the system efficiency, so long as the speed is not less than 50% of the normal speed. Health level self-priming pump.
Energy consumption level:
Assume that through the above four kind of way to pump output flow from 60 m3 / h to adjust to the 50 m3 / h, the output is 60 m3 / h when the power consumption of 100% (the pressure head is 70 m), then several kinds of method of traffic control effect on the consumption of the pump power?
(1) outlet valve opening adjustment, energy consumption is 94%, and the power consumption is large when the flow is low.
(2) by-pass adjustment, the bypass valve reduces the pressure head of the pump to 55M, which can only be achieved by increasing the flow of the pump, resulting in a 10% increase in energy consumption.
(3) adjust the diameter of the impeller, reduce the output flow and pressure of the pump after the diameter of the impeller, and reduce the energy consumption to 67%.
(4) speed control, low speed, reduced pump flow and pressure head, and reduced energy consumption to 65%.
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