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Secret pump lift what does it mean
Pump as a very common production and living Tools, the use of a very wide range. For most people, the meaning of some proper names for water pumps is not clear. For example, today Xiaobian want to tell the pump head. Pump lift What does it mean? Pump lift what is the role? Please check with Xiaobian! Uncover what is the meaning of the pump head (a) what is the meaning of the pump head 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 at which the pump can pump water, usually indicated by the symbol H, in 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. 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 as 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. (H) the head of the pump, flow calculation formula Pump head H = 32 What does it mean? Head H = 32 is that this machine can raise the water up to 32 meters Flow = cross-sectional area * Flow velocity Need to determine their own: Third, the pump lift estimates Pump head and the size of the power does not matter, and the size of the impeller impeller pump diameter and the level of the same power pump may lift hundreds of meters, but the flow may only be a few parties, it may be only the head A few meters, but the flow may be hundreds of square. The general rule is that under the same power, high head flow is less, head low flow, there is no standard formula to determine the lift, and your conditions of use and the factory pump model to determine. You can press the pump outlet pressure gauge to calculate, such as the pump outlet is 1MPa (10kg / cm2) That lift is about 100 meters, but also consider the impact of suction pressure. Centrifugal pump, it has three heads: the actual suction head, the actual pressure head and the actual lift head, in the absence of specified circumstances, the head is generally considered that the difference between the height of the two surface water. (4) Formula for estimating pump power: N = Q (L / s) * H (m) / 102 / (0.6 ~ 0.85) /0.85 The explanation is: N, the power in kilowatts (kW) Q, Is liter per second (L / s) H, head, the unit is meters (m) 102, is 1000 / g, g is the acceleration of gravity, is a unit conversion 0.6 ~ 0.85, is the efficiency of the pump, Value, small flow rate to take a small value; 0.85, power factor In addition, the general pump power has some modulus, from small to large: 1.1kW, 2.2kW, 3kW, 4kW, 5.5kW, 7.5kW, 11kW, 15kW, 18.5 kW, 22kW, 30kW, 37kW, 45kW, 55kW, 75kW, 90kW, 110kW, 132kW ... and generally do not have a 25kW pump. Asia Fluid Network () Editor: Huang Nengwen, QQ: