Pump head, flow and power is an important parameter to examine the performance of the pump. 1, flow Pump flow is also known as the amount of water, it refers to the number of pumps in the unit of time to transport water. The symbol Q, expressed in liters / second, cubic meters / second, cubic meters / hour. 2, head The head of the pump is the height of the pump to pumped water, usually indicated by the symbol H, the unit is meters. Centrifugal pump lift impeller centerline as a benchmark, divided by two parts. The vertical height from the center of the pump impeller to the water surface of the water source, that is, the height at which the water pump sucks up the water, is called the suction lift. The vertical distance from the center of the pump impeller to the water surface of the sump, that is, The height, called the pressure head, referred to as pressure process. That the pump head = suction head + pressure head lift It should be noted that the nameplate lift is the pump itself can produce lift, it does not contain pipe water flow friction resistance caused by the loss of head. In the selection of pumps, be careful not to be ignored. Otherwise, it will not be pumping water. 3, the power in unit time, the size of the work done by the machine is called power. Usually symbol N to represent. Common units are: kg · m / s, kW, horsepower. Usually the motor power unit is expressed in kilowatts; diesel or gasoline engine power horsepower expressed. Power machine passed to the pump shaft power, known as the shaft power, can be understood as the input power of the pump, pump power is generally referred to the shaft power. Frictional resistance of bearings and packing; friction with water when impeller rotates; vortex of water flow in the pump, clearance backflow, inlet and outlet, mouth impact and other reasons. Inevitably consumes part of the power, so it is impossible for the pump to completely change the power input from the power machine into an effective power, of which there is a power loss. That is to say, the sum of the effective power of the pump and the lost power of the pump is the shaft power of the pump.
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