Centrifugal pump main performance parameters (with photos)

First, the flow Q (m3 / h or m3 / s) Centrifugal pump flow is the centrifugal pump liquid delivery capacity, refers to the unit of time the volume of liquid delivered by the pump. Pump flow depends on the size of the pump structure (mainly the diameter of the impeller and the width of the blade) and speed. During operation, the actual amount of liquid that the pump can deliver is also related to the resistance of the tubing and the pressure required. Second, head H (m) Centrifugal pump lift, also known as the pump head, refers to the weight of a single fluid pump obtained by the energy. Pump head size depends on the structure of the pump (such as the size of the impeller diameter, the bending of the blade, etc. The current pressure on the pump can not be made from the theoretical calculations, the general test method to determine the pump lift With the experimental determination, that is, at the pump inlet with a vacuum gauge, the outlet with a pressure gauge, if not counting the difference between the two sections of the kinetic energy (ie Δu2 / 2g = 0), excluding the loss of energy between the two sections f1-2 = 0), the pump head can be calculated by the following formula Note the following two points: (1) where p2 is the pressure gauge reading at the pump outlet (Pa); p1 is the vacuum gauge reading at the pump inlet Pressure, Pa). (2) Pay attention to distinguish between two different concepts of lift head (head) and lift height of centrifugal pump.Head is the energy gained by pumping the unit weight of fluid in the pump.In two-section (Including pump) listed Bernoulli formula and finishing Available where H is the head, and lifting height refers only to Δz a Example 2-1 is now measured the head of a centrifugal pump working fluid 20 ℃ water , Measured flow rate of 60m / h, the pump inlet vacuum gauge reading -0.02Mpa, read out the pressure gauge The number of 0.47Mpa (gauge pressure), the vertical distance between the two tables is known to be 0.45m If the pump suction pipe and extrusion pipe diameter the same, try to calculate the pump head. Third, the efficiency of the pump in the process of conveying liquid, the shaft Power is greater than the power delivered to the pipe from the impeller due to volume losses and loss of mechanical losses of the hydraulic components consume a portion of the power and the efficiency of the centrifugal pump reflects the degree of utilization of the pump for the applied energy. Value and pump type, size, structure, manufacturing accuracy and the nature of the liquid transport.Large pump efficiency value higher, the smaller the value of the smaller pump efficiency. Fourth, the shaft power N (W or kW) Pump shaft power that pump shaft The required power, its value can be calculated according to the pump's effective power Ne and efficiency η, that is

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