What is the pump flow rate calculation formula?
In the process of using the pump, it is often necessary to calculate the pump flow, but many people do not know the pump flow calculation formula. We will take the submersible pump and gear pump as an example to introduce the pump flow calculation formula in detail.
The volume of liquid discharged by the pump per unit time is called flow, and the flow rate is expressed by Q.
Unit of measurement: cubic meter / hour (m3 / h), liter / sec (l / s), L / s = 3.6 m3 / h = 0.06 m3 / Min=60L/minG=Qρ G is the weight ρ is the liquid specific gravity.
The shaft power (kw) of the pump = water supply (liter / sec) × head (m) / 102 × efficiency = flow × head × density × gravity acceleration.
102 is a unit finishing constant. Pump effective power / pump shaft power = pump efficiency (generally 50% - 90%, large pump is higher) The energy obtained by the pump per unit weight of liquid is called the lift. The lift of the pump, including the suction stroke, is approximately the difference between the pump outlet and the inlet pressure. The lift is indicated by H and the unit is meters (m).
The efficiency of the pump refers to the ratio of the effective power of the pump to the shaft power. The power of the η=Pe/P pump usually refers to the input power, that is, the power that the prime mover transmits to the pump shaft, so it is also called the shaft power, which is denoted by P. The effective power is the product of the pump head and mass flow and gravity acceleration.
Submersible pump flow calculation formula: 60HZ flow × 0.83 = 50HZ flow 60HZ lift × 0.69 = 50HZ lift 60HZ power ÷ 1.728 = 50HZ motor power motor output power = Q (flow) × H (head) / 367.2 / efficiency × 1.15 motor output power = shaft power × 1.15 pump efficiency = Q × H × 0.00272 / motor power Q represents flow; H represents the head; 0.83 / 0.69 / 1.728 / 367.2 / 1.15 / 0.00272 are all coefficients.
The gear oil pump flow calculation formula is: Z——number of teeth; n——number of revolutions, revolutions/minutes; ηv——volume efficiency, for general gear oil pumps, the value can be taken as 0.70~0.90; q——the volume of the pit between the two teeth, cubic meters.
