Multi-stage centrifugal pump capable of self-balancing axial force by impeller

Abstract

Said invention refers to multistage centrifugal pump with impeller self balancing axial force. Said invention adopts end surface sealed structure on impeller entrance, the impeller band being greater than impeller hub area, the fit between impeller band outside diameter with diversion shell being clearance fit, impeller entrance end surface sealing sub being thrust bearing sub etc method to realize completely balancing axial thrust effect depending on impeller itself, thoroughly solving multistage centrifugal pump axial force destruction problem, and reducing multistage centrifugal pump production costs.

Description

Technical field [0001] The invention relates to a fluid machine for increasing liquid pressure, in particular to a multistage centrifugal pump which needs to overcome axial force. Background technique [0002] At present, the known multi-stage centrifugal pumps have serious axial force problems, because when the impellers are working, axial forces will be generated on the impellers, and the multi-stage centrifugal pumps have more impellers, and the axial force problems will be serious . Generally, single-stage centrifugal pumps use radial seal rings and balance holes or back blades on the impeller to balance part of the axial force, and the remaining axial force is borne by the bearing, while multi-stage centrifugal pumps generally use balance drums or balance discs. These two methods are used to balance the axial force. Among these four methods, only the balance disc device can fully automatically balance the axial force, and the other three methods have residual axial fo...

AI Technical Summary

Problems solved by technology

Among these four methods, only the balance disc device can fully automatically balance the axial force, and the other three methods have residual axial force. For multistage centrifugal pumps, the residual axial force is sometimes very large, so There is still a possibility of damage

However, the design and manufacture of the balance plate device is very difficult. Since the axial force required to be balanced by the multistage centrifugal pump changes greatly at the moment of start-up, a slight error in the design and manufacture of the balance plate device will result in a failure during the start-up process of the pump. Strong rotor series movement and balance disk friction in the middle will also cause damage to the multistage centrifugal pump

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