Cause Analysis and Solution of Cavitation Erosion in Centrifugal Pump

The performance of centrifugal pump directly affects the performance of coal mine production safety, disturbing the normal operation of centrifugal pump is a big problem of centrifugal pump impeller blade damage, the main reason for such damage is often the impeller occurs Cavitation phenomenon. So, how should we deal with such a situation? Centrifugal pump cavitation phenomenon analysis and solutions 1. Well-planned pond water intake into the pond to be stable and smooth, without vortex and bias current, or centrifugal pump cavitation damage, therefore, into Pond shape and size to be satisfied with the steady and average flow of water requests. In addition, real-time elimination of ponds into the dirt and sludge, so that water flow, the average flow pattern, but also to ensure that the inlet horn has sufficient engulfing depth. 2. Properly positive centrifugal pump assembly elevation Centrifugal pump assembly elevation should be centrifugal pump assembly elevation calculation formula accurately calculate the assembly elevation. 3. Even if the centrifugal pump in operation near the planned conditions in the centrifugal pump operation, based on the detailed environment of the pump station, adopt appropriate conditioning steps conditioning centrifugal pump operating conditions to avoid the pump operating conditions deviate from the planned conditions far. Centrifugal pump can be appropriate to reduce the flow to move the operating point to the left; to deal with the axial flow pump operating point (NPsH), the value of the smaller areas. 4. Matching the proper water inlet pipe into the water pipe should be short, cut unnecessary pipe fittings, pipe diameter is appropriately increased to reduce the head loss of the water inlet pipe. Centrifugal pump entrance to the water flow rate and pressure distribution average, horizontal centrifugal pump to deal with horizontal, horizontal centrifugal pump inlet straight pipe length should not be too short, usually not less than 4 to 5 times the diameter of the inlet pipe. Large and medium-sized pump station inlet runner type, layout and size to be properly planned, to ensure good and effective hydraulic premise, to avoid harmless drift and vortex generation. 5. To control the sediment concentration of water pumping station from the more sediment channel, because of the large sediment concentration in the water, will increase the flow of parts wear and make the water pump function improved. Therefore, for more sediment flow must use a certain amount of sediment control sand flow to reduce the sediment concentration, the product should also be selected wear-resistant pump products such as wear-resistant slurry pump. 6. The pressure at the inlet of the centrifugal pump increases the pressure on the inlet pipe of the centrifugal pump. For example, the water in the outlet pipe of the centrifugal pump is introduced into the inlet pipe and pressurized by the nozzle to aggravate the cavitation damage. 7. Stop coating and repair in real time If the overcurrent components of the centrifugal pump have been denuded, metal or non-metallic materials can be used to apply repairs in real time to the ablation site. After applying the repaired impeller, the anti-erosion and anti-wear ability will greatly improve, not only extend the service life of the impeller, but also improve the efficiency of the pump. 8. Improve the smoothness of the outer surface of the impeller and the over-current components Centrifugal pump machine surface layer of the impeller and the rest of the over-current components of the surface finish, the better the anti-cavitation function, the less likely to produce cavitation. 9. In the cavitation zone gas in the centrifugal pump into the water side to make up for excessive atmosphere, can slow the bubble when the impact of disillusionment, and reduce the cavitation area of ​​the vacuum, thereby increasing the cavitation damage. However, into the excessive amount of space, or will make the centrifugal pump suction machine can deteriorate, adopt this method must be solemn. 10. Low centrifugal pump speed Water absorption function parameters and speed is proportional to the square, low centrifugal pump speed, can increase the cavitation damage. (Editor: Huang Nengwen QQ:)

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