Power and efficiency of slurry pump
1。 Mechanical efficiency
The mechanical efficiency of centrifugal pump refers to the ratio of hydraulic power pH to shaft power P, which is used to measure the magnitude of mechanical loss power △ PM, expressed by 7:
安徽快3开奖结果2. Volumetric efficiency
The volume efficiency of centrifugal pump refers to the ratio of actual flow Q to theoretical flow QT, which is used to measure the large flow loss of centrifugal pump
Small, denoted by η:
3。 Hydraulic power and efficiency
The hydraulic power of centrifugal pump refers to the energy given by impeller in unit time, which is expressed in pH:
Where HT - Theoretical lift, m;
QT - theoretical flow, refers to the flow without considering the flow loss, m2 / s.
The hydraulic efficiency of centrifugal pump refers to the ratio of effective head h to theoretical head HT, which is used to measure the flow loss, expressed by η H:
4。 Shaft power and total efficiency
The relationship between shaft power and above power is: slurry pump manufacturer
Formula (1-43) shows that the total efficiency η of the pump is equal to the product of volumetric efficiency η V, hydraulic efficiency η h and mechanical efficiency η M. In order to improve the efficiency of the pump, we must consider and reduce all kinds of losses from the aspects of design, manufacture and operation. The reference values of various efficiency of general centrifugal pump are listed in table 1-3.