The pump operates in a high efficiency zone, minimizing the shaft power, which can be difficult for different models. Panda pump in the analysis of centrifugal pump characteristics, based on the relationship between pump efficiency and flow indirectly obtained speed ratio M, for solving such problems provide a method. The use of frequency control system, real-time regulation of the pump speed, and meet the different needs of water supply, is a new scientific method of energy saving, in theory, can basically avoid the unnecessary loss of valve regulation.
First of all, the performance curve of the pump is on the flow and head of the quadratic curve, with the increase in water, water pump to provide the head is constantly reduced. Pump performance curve Centrifugal pump in the rated speed characteristic equation is: where the virtual total head for the zero flow is a constant associated with the pump, when access to frequency conversion equipment, with the pump speed continues to decline, parallel to the pump curve shift. The characteristic becomes: which is the speed ratio of water pump in addition there is a very important parameter curve, the curve increases monotonically by the monotonous increase in the peak monotonically reduce the peak should correspond to the design curve on the characteristic point, and the corresponding point The flow rate for the rated flow, the pump operating point in the operating point, the minimum loss. The farther away from the design conditions, the lower the efficiency.
Moreover, the industrial pump to pump the efficiency of the restrictions, the operating point can not deviate from the operating point too far the general efficiency of the pump must be above the peak. This will not be a low efficiency of the pump range, taking into account the pump frequency control ratio is limited, can not let the pump speed is too low.
Based on the above conditions, and then use the similar conditions of parabolic, you can get on the curve of a variable frequency pump operating point of the feasible area, when the pump operating point out of this area efficiency will be due to low and not meet the requirements. Forever pump factory that there is a need for a similar situation to do a little parabolic interpretation of similar parabolic equation in this equation on the various working conditions in the head of the square of water into a fixed proportion and has a very important nature – run time The efficiency is almost the same.
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