The characteristic curve of centrifugal pump is the inherent characteristic of the pump, it has nothing to do with the use of the outside world. However, once the pump is arranged in a certain pipeline system, the actual work is not only related to the characteristics of the centrifugal pump itself, but also depends on the working characteristics of the pipeline. Therefore, to select and make good use of centrifugal pump, it is also considered the characteristics of the pipeline at the same time.
Because there are various losses in the operation of the centrifugal pump, the effective pressure head and flow rate of the pump are lower than the theoretical value, and the input pump power is higher than the theoretical value.
H______ pump effective pressure head, that is, the unit volume of liquid in the gravity field from the pump to get the energy, m;
Q ______ the actual flow ofpump, m3/s;
P ______ liquid density, kg/ m3;
Ne______ the effective power of the pump, that is, the mechanical energy of the liquid from the pump unit at the time of the unit, W.
Effective power can be written as Ne = QH = g
The power of the centrifugal pump is referred to as the pump shaft power, which is expressed by N. The effective power and shaft power is defined as the ratio of the total pump efficiency, namely =Ne/N according to the above analysis, we can understand the energy loss in the centrifugal pump to work, how to improve the power of centrifugal pump for efficient use of products of great significance. Each product has a shortage of places, these weaknesses may lead to a reduction in the use of the product performance. At this time the power is a very good test method, how to maximize the power of the product, the need for professionals to do more work and research.
