Centrifugal pump design, Deputy impeller what role?
But if the auxiliary impeller is installed, the liquid acts on the auxiliary impeller, and the direction of the pressure difference force is opposite to the resultant force of the two forces, so that a part of the axial force can be counteracted, and the service life of the bearing is prolonged. But with vice impeller seal system also has a drawback, that is to be Deputy impeller part of the energy consumption, generally around 3%, but as long as the design is reasonable, can be reduced to a minimum of this part of the loss.
Vice impeller play a role in addition to sealing, but also can reduce the axial force in the submersible sewage pump is mainly in the axial force acting on the impeller on the liquid pressure force and the rotating part of the gravity of the composition, the direction of the two force is the same, efforts are made by the two forces add a. As can be seen, in the same performance parameters, the axial force of submersible sewage pump is larger than the general horizontal pump, but the balance is more difficult than vertical pump. Therefore, in diving sewage pump, bearing is easy to damage, the reason is also with the axial force has a great relationship.
The so-called hydrodynamic impeller seal Deputy refers to the installation of an open impeller in the opposite direction near the back of the coaxial pump impeller hub. When the pump work, vice impeller with the pump with the rotating spindle, the Deputy impeller with the liquid will rotate, rotation of the liquid will produce an outward centrifugal force, the centrifugal force on the one hand the flow of mechanical seals to withstand the liquid, reducing the mechanical seal pressure. On the other hand, the solid particles in the medium are prevented from entering the friction pairs of the mechanical seal, and the wear of the mechanical seal block is reduced, and the service life is prolonged.
