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Axial Flow Impeller Reduce Wear Of Mechanical Seal Grinding Block
Nov 06, 2017

Usually also called the Axial Flow Impeller vane or back impeller, refers to the pump impeller behind the back cover plate in the opposite direction of the same axis installation of an open impeller, the main role is to balance the axial force, and reduce the pressure of the sealing cavity.

Axial Flow Impeller in the pump work, the pump spindle rotating together, the secondary impeller of the liquid will also rotate together, rotating liquid will produce an outward centrifugal force, this centrifugal force on the one hand to resist the flow of liquid to mechanical seals, reducing the pressure of mechanical seals. On the other hand, to prevent the solid particles in the medium into the mechanical seal of the friction pair, reduce mechanical seal wear, prolong its service life.

The Axial Flow Impeller in addition to the sealing effect, can also play a role in reducing axial force, in the submersible pump axial forces are mainly by the liquid action on the impeller of the pressure and the entire rotation of the gravity component, the two forces are the same direction of action, the resultant force is composed of two of forces. It can be seen that in the same performance parameters, the axial force of the submersible pump is larger than the general horizontal pump, and the difficulty of balance is more difficult than the vertical pump.

And if the Axial Flow Impeller is installed, the liquid acting on the Axial Flow Impeller pressure on the direction of the force is the opposite of the two forces, which can counteract a part of the axial force, but also played a role in prolonging the bearing life. However, the use of Axial Flow Impeller sealing system also has a disadvantage, that is, in the Axial Flow Impeller to consume a part of the energy, generally around 3%, but as long as the design is reasonable, can completely reduce this part of the loss to a minimum.

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