Impact wear resistance and corrosion centrifugal pump performance curve shape factors, measures of eliminating hump

Abrasion and corrosion of centrifugal water pump performance curve if there hump, will appear unstable phenomenon in running, this is not allowed. Therefore, when the pump is in the design idea must take measures to make the wear resistance and corrosion of centrifugal pump performance curve does not produce hump. This article discussed the wear resistance and corrosion of centrifugal pump performance curve shape and the factors influencing performance curve shape, measures of eliminating hump.

wear-resisting corrosion centrifugal pump performance curve shape, influencing factors and measures of eliminating hump:

common wear resistant and corrosion of the centrifugal pump performance curve, can be divided into flat, steep drop and three kinds of hump, as shown in figure 1.

       1. Steep fall in the performance curve of

with this shape of the performance curve, is suitable for flow and pressure head is smaller, Head) Change a larger system or pressure head have fluctuate demand flow little change of the system.

       2. Flat performance curve

this is suitable for the pump performance curve in the shape of flow regulating range is larger and pressure head asks the system with small changes.

       3. Has a hump performance curve

with this shape of pump performance curve, when running a towel may appear unstable working condition, it will affect the safe operation of pump. For a hump of the performance curve, general provisions head working point must be smaller than the dead lift, avoid the pump running under unstable conditions.

factors that affect pump performance curve shape and the elimination of the hump measures: many factors influencing the pump performance curve shape, these factors are generally classified into the following:

1) Leaf number Z; ( 2) Blade outlet Angle; ( 3) body throat area; ( 4) The impeller outlet width; ( 5) Leaf blade shape; ( 6) Volute tongue clearance insulation; ( 7) Pressurized water chamber area: ( 8) Outlet blade thickness; ( 9) The impeller inlet liquid prewhirl; ( 10) Than the revolution, and so on.

in eliminating hump on pump performance curve, both at home and abroad have done a lot of experimental research work, put forward many measures and ways to eliminate or reduce the hump, mainly has the following several kinds:

1) Reduce the blade outlet Angle of the ( 2) Reduce the number of blades Z ( 3) Reduce the pressurized water chamber area, improve the die head ( 4) Make the impeller entrance liquid produces prewhirl ( Such as the back guide blade outlet Angle is less than 90 degrees. ) , make the performance curve steep fall ( 5) Reduce asked every tongue gap ( 6) Suction pipe with rectifier grille ( Partition) ( 7) Set the idler, etc.

these measures and method can be used alone, can also be combined. No matter what kind of measures are taken, wear resistance and corrosion centrifugal pump lift and efficiency must be considered and cavitation performance requirement, can't attend.

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