Professional production of high temperature magnetic pump Stainless steel magnetic pump Pneumatic diaphragm pump Electric diaphragm pump Vertical pipeline pump Horizontal pipeline pump (1) Flow Q Pump flow refers to the pump in the unit time by the pump outlet volume of liquid discharged to the Q said, The unit is m3 / h or m3 / s. (2) Head The head of H pump refers to the unit weight of the liquid obtained by the pump after the energy, expressed in H, the unit is m, that is, the height of liquid column discharge liquid. (3) speed n pump speed refers to the number of revolutions per pump unit, expressed in n, the unit is r / min. (4) Power and Efficiency ① Effective Power The effective power of Pu pump is the effective energy obtained by the liquid delivered by the pump in unit time, also called the output power. Where Q-pump flow, m3 / s; H-pump head, m; p - medium density, kg / m3; g - acceleration of gravity, g = 9.81m / s2. ② shaft power Pa pump shaft power refers to the unit time passed from the prime mover to the shaft of the work, also known as input power, the unit is w or kW. ③ efficiency л pump efficiency л is the pump effective power and shaft power ratio, namely: л = Pu / pa centrifugal pump characteristic curve Pump characteristics curve reflects the pump at a constant speed of the performance parameters. The typical characteristic curves provided by the domestic pump factory are shown in Figure 2-3. Generally, they include HQ line, NQ line, лQ line and NPSH-Q line. Many foreign pump plants and some domestic pumps that introduce technology to produce tend to provide full-property curves, as shown in Figure 2-4, which include HQ lines at different impeller diameters. Figure 2-4 CZ40-200 Centrifugal Pump Performance Code Line (л = 2900r / min) Equivalent, Isometric and NPSH Q lines.

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