About the introduction of the auxiliary impeller of the quality impeller

Release time:

2022-04-28

The so-called hydrodynamic seal of the auxiliary impeller of the quality impeller refers to the installation of an open impeller in the opposite direction coaxially near the back of the back cover of the impeller of the pump.

About the introduction of the auxiliary impeller of the quality impeller

impeller from China manufacturer

When the pump is working, the sub-impeller of the quality impeller rotates with the main shaft of the pump. The liquid in the sub-impeller of the quality impeller will also rotate together, and the rotating liquid will generate an outward centrifugal force.

On the one hand, this centrifugal force resists the liquid flowing to the mechanical seal and reduces the pressure on the mechanical seal. On the other hand, it prevents the solid particles in the medium from entering the friction pair of the mechanical seal, reduces the wear of the abrasive block of the mechanical seal, and prolongs the service life of the auxiliary impeller of the quality impeller.

In addition to the role of sealing, the auxiliary impeller of the quality impeller can also reduce the axial force. In the submersible sewage pump, the axial force is mainly composed of the differential pressure force of the liquid acting on the quality impeller and the gravity of the entire rotating part.

The two forces act in the same direction, and the resultant force is formed by the addition of the two forces. It can be seen that under the same performance parameters, the axial force of the submersible sewage pump is larger than that of the general horizontal pump, and the balance difficulty is more difficult than that of the vertical pump. Therefore, in the submersible sewage pump, the reason why the bearing is easily damaged is also closely related to the large axial force.

If the auxiliary impeller is installed on the quality impeller, the direction of the pressure differential forces acting on the auxiliary impeller by the liquid is opposite to the resultant force of the above two forces. This can offset part of the axial force, which also plays a role in extending the life of the bearing.

However, the auxiliary impeller sealing system using the quality impeller also has a disadvantage, that is, a part of the energy is consumed on the auxiliary impeller, generally about 3%. However, as long as the design is reasonable, the loss of this part on the auxiliary impeller of the quality impeller can be reduced to a minimum.

Through the above introduction and analysis of the quality impeller of the impeller, hope it helps you.

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