The so-called vice impeller sealing refers to the submersible pump impeller near the reverse direction to install a coaxial open impeller. When the pump impeller, vice rotated together with the pump shaft of liquid will also vice impeller rotates, the liquid will produce a rotating centrifugal force, the outward flow of centrifugal hand against mechanical seal liquid, reduces the mechanical seal pressure. On the other hand stop medium solid particles into the mechanical seal, reduce the friction pair of mechanical seal grinding block wear and prolong its service life.
But deputy impeller sealing effect, still can rise to reduce axial force, in the submersible sewage pumps axis powers to the liquid in the impeller role if the differential pressure and the rotating parts of gravity, the two force direction is the same, is by adding two forces.
It can be seen in exactly the same performance parameters, under the situation of submersible sewage pump of axial force to pump more than general horizontal and vertical pumps to more difficult than the balance. So in the submersible sewage pumps, bearing damage easily its reason and axial force has a great relationship.
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