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Slurry Pump Wear Pattern

When the slurry pump pumps the solid-liquid mixture, the most worn part is the impeller, followed by the pump body or the flow-through parts such as the sheath and the guard plate. The wear of the pump depends on the intrinsic relationship between the following parameters and factors:

(1) Rheological properties of solid-liquid mixture.

(2) Solid particle size distribution, particle shape, hardness and density, etc.

(3) The structural form and parameters of the pump.

(4) The rotational speed of the pump or the peripheral speed of the impeller.

(5) The performance of pump materials, such as hardness, strength, elongation, acid and alkali resistance, heat resistance, etc.

Impeller Wear Law When the solid-liquid mixture flows into the impeller from the short suction pipe, the solid particles turn from the axial direction to the radial direction and move towards the back cover. Due to the inertia effect, the back cover will bear the larger particles. force, increased wear. Most of the solid particles enter the blade flow channel near the blade working surface from the front edge of the blade, while some particles enter the flow channel near the back of the blade. Judging from the impeller wear morphology and wear results, the blade wear spreads from its leading edge to the trailing edge. When pumping a mixture of fine particles, the trajectory in the blade flow channel is similar to the curvature of the blade blade, and the wear on the working surface of the blade is greater than that on the back of the blade.

When the solid particles come out of the blade, the fine particles move along the trajectory with the smaller exit angle. The surface adjacent to the outer periphery of the impeller is serious, and the fine particles have a small radial velocity in the mixture flow zone. The mixture flows out from the impeller and slowly flows to the inner peripheral wall of the pump body, and the solid particles gradually increase. The outlet edge of the impeller blade bears the strong action of the mixture, and the blade outlet edge is the most severely worn part of the 29 blades.