![]() When the flow rate is small, due to the influence of the pre-rotation, the pressure at the center of the impeller inlet is lower than the pressure at the outer periphery, and the leakage through the balance hole increases. Under non-rated flow, the flow state changes. In addition, the leakage flow through the balance hole collides with the main liquid flow entering the impeller, destroying the normal flow state, and reducing the cavitation resistance performance. The disadvantage of using this balance method is that there will be a loss of efficiency (the leakage of the balance hole is generally 2% to 5% of the design flow). It is worth noting that the sealing ring and the balance hole are complementary to each other. The degree of reducing the axial force depends on the number of pump holes and the size of the hole diameter. It has an effect on protecting bearings, thrust plates and controlling pump pressure. The impeller is punched to reduce the axial direction generated by the impeller. Because the liquid is acted on by the blades, the pressure and speed increase at the same time, and a forward axial force is generated. The center is thrown to the periphery of the impeller along the flow path between the blades. When the impeller rotates, the liquid filled in the impeller moves from the impeller under the action of centrifugal force. ![]() It reduces the wear of the bearing end surface and the wear of the thrust plate. ![]() The balance hole (return port) is mainly used to balance the axial force generated by the impeller when it is working. Briefly on the balance hole of centrifugal pump impeller
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