It is calculated according to the relationship between speed and head in the proportion law.It is applicable to the condition that the conveying medium remains unchanged.At this time, the geometric dimension scale constantλL=1
The calculation based on the proportional relationship between speed and power of the proportional law is applicable to the case where the conveying medium is unchanged.At this time, the geometric dimension scale constantλL=1
Calculate the speed and flow of centrifugal pump according to the proportion law.It is applicable to the condition that the conveying medium remains unchanged.At this time, the geometric dimension scale constantλL=1
Mechanical loss power includes three parts: wheel resistance loss power, friction loss power at shaft seal and friction loss power between shaft and bearing are calculated according to the formula Nm=Ndf+△ N2+△ N3
The hydraulic power of a centrifugal pump refers to the energy given by the impeller of the pump in unit time, which is different from the effective power. The effective power is the effective energy head obtained from the pump by the liquid pumped out in unit time.There are flow loss and impact loss in the pump, and the energy given by the impeller cannot be completely converted into liquid
According to the formulaηV=Q/QT=(QT-q)/QTηV is the pump volume power, unit: 1;QT is the theoretical flow, in m3/s;Q is the leakage amount, in m3/s;Q is the actual flow, in m3/s
According to the formulaηH=H/HT=(HT hf hs)/HT, where HT is the theoretical head, m;Hf is the pump flow loss, m;Hs is the pump impact loss, m;ηH is the hydraulic efficiency;H is the effective lift.Note: When the flow loss in the pump is not considered, the liquid flowing through the pump has obtained the theoretical head HT.But there is flow loss in the pump
Pump head online calculator: this formula is used to calculate the pump head in operation, according to the energy equation of the liquid flow at the pump inlet and outlet
Pump head online calculator: used to calculate the condition that a certain flow of liquid is transported in a known pipeline.Calculate according to the formula, where PA is the suction tank pressure, Pa;PB is the pressure of drain tank, Pa;ρIs the density, kg/m3;ZA is the elevation of suction tank, m;ZB is the elevation of drain tank, m;CA is the average flow of liquid in the suction tank
