The main performance parameters of the horizontal multi-stage centrifugal pump

We in horizontal multi-stage centrifugal pump selection, the first thing to know what horizontal multi-stage centrifugal pump is the main performance parameters, these parameters represent? After the performance parameters of centrifugal pump after, can accurately find suits own centrifugal pump. The main performance parameters of the horizontal multi-stage centrifugal pump is as follows:

1, flow centrifugal pump flow is refers to the unit time into the piping system of the liquid volume, Q, is commonly used in common unit for l/s, m3 / s, or m3 / h, etc. The flow of centrifugal pump is associated with the structure, size and speed of the pump. flow depends on the structure size of the pump ( Mainly for the width of the diameter of the impeller and blade) And speed, etc. Operation, actual amount can transport liquid pump is related to the pipeline resistance and the required pressure. Head 2,

head of centrifugal pump is centrifugal pump of unit weight ( 1 n) Liquid the effective supply of energy, H, is commonly used in the unit for J/N or m. Centrifugal pump lift is also known as the head of the pump, pump lift size depends on the structure of the pump ( Such as the size of the impeller diameter, blade bending condition, speed, etc. Now for the pump head is not theoretically make a precise calculation, general experimentally determined. Efficiency of 3,

in the process of conveying liquid, the pump shaft power is greater than the line to the liquid in the pipeline from the power of the impeller obtained because of the volume loss and hydraulic loss part of mechanical loss is to consume power, and the efficiency of the centrifugal pump which reflect the pump plus energy utilization degree.

pump and pump efficiency value of the type, size, structure, manufacturing precision and conveying the nature of the liquid. Large, high pump efficiency value, small pump efficiency value lower.

energy loss of centrifugal pump consists of the following three items:

1) Hydraulic loss due to the frictional resistance of liquid flows through the blades, volute, port area and the direction of the change of local resistance, and the circulation and vortex in the impeller channel factors caused by the loss of energy. This loss of hydraulic efficiency eta h available to response. Under the rated flow, the movement direction of the liquid just consistent with the blade inlet Angle, minimum loss at this moment, the hydraulic efficiency is highest, its value at zero. 8 to 0. 9 categories.

( 2) Mechanical efficiency due to the high speed rotating impeller surface and the friction between liquid, in the place such as bearings, shaft seal of pump shaft mechanical friction caused by the loss of energy. Mechanical loss available eta m to reflect the mechanical efficiency, its value at zero. 96-0. 99.

( 3) Volume loss or leakage caused by the loss, no loss of volume pump power with loss of volume of the pump power is known as the volumetric efficiency of eta v. Closed impeller of volumetric efficiency value at zero. 85-0. 95.

the total efficiency of a centrifugal pump is composed of three parts, namely

eta eta h = eta v eta m ( 2 - 14)

the efficiency of centrifugal pump and pump type, size, machining accuracy, related to the factors such as the nature of the liquid flow. Typically, small pump efficiency for 50 ~ 70%, and large pump can reach 90%.

4, shaft power N

by motor transport into the pump shaft power is called the pump shaft power, units to W or kW. The effective power of the centrifugal pump is refers to the liquid in a unit time get energy from the impeller, are

Ne = HgQ rho ( 2 - 15) Type in the

Ne - - - - - - The effective power of the centrifugal water pump, W;

H - - - - - - - - Centrifugal pump head effectively, m;

Q - - - - - - - - Actual flow centrifugal water pump, m3 / s.

due to the existence of the above three in pump energy loss, shaft power will be greater than the effective power, namely

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