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Sewage Submersible Pump sewage submersible pump adjustment methods are mainly due to economic conditions and engineering conditions, for the sewage submersible pump, as its range of use increases, the regulation of its flow by more and more professionals The concern and attention. The following will be introduced in several ways sewage submersible pump adjustment methods: Sewage submersible pump adjustment methods are generally used in three ways: 1, sewage submersible pump string, and even the adjustment: When a single centrifugal pump can not meet the delivery tasks, Centrifugal pumps can be used in parallel or in series. In parallel with two centrifugal pumps of the same type, although the pressure head changes little, but increases the total delivery flow, the total efficiency of the parallel pump is the same with the efficiency of a single pump; when the centrifugal pump is connected in series, the total pressure head increases, Little change in flow, the total efficiency of tandem pumps with a single pump the same efficiency. 2, change the pipeline characteristic curve: Change submersible pump sewage pump flow is the easiest way to use the pump outlet valve opening to control, its essence is to change the position of the pipeline characteristic curve to change the pump working point. 3, change the sewage submersible pump characteristic curve: According to the law of proportion and cutting law, change the pump speed, change the pump structure, these two methods can change the characteristics of the sewage pump curve, so as to achieve the purpose of regulating the flow. However, it is less convenient to change the pump structure for an already working pump and to reduce the versatility of the pump by changing the pump configuration, although it is economically convenient to regulate the flow at some point and is rarely used in production. The above analysis only changes the sewage submersible pump speed to change the flow method. If you change the pump speed, the flow rate drops from Q1 to Q2, the pump speed will drop from n1 to n2, the speed is n2 pump characteristic curve QH and pipeline characteristic curve He = H0 + G1Qe2 intersection at point A3, point A3 is After adjusting the flow through the new operating point. The adjustment method has the advantages of obvious adjustment effect, quickness, safety and reliability, prolonging the service life of the pump and saving electric energy, and additionally reducing the running speed of the centrifugal pump can effectively reduce the NPSHr of the centrifugal pump and keep the pump away from the cavitation zone and reduce the centrifugal pump The possibility of cavitation occurs. The disadvantage is to change the pump speed through the need to have the frequency conversion technology to change the speed of the prime mover, the principle of complex, larger investment, and the flow adjustment range.
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