Vice impeller dynamic seal and parking seal packing and mechanical seals can be overcome certain deficiencies, a simple structure, reliable sealing, fluid does not leak point advantage is now in metallurgy, mining and petrochemical industries to be more universal application.

 Vice impeller dynamic seals

 Vice impeller dynamic seal (also known as centrifugal seal, fluid power seals, etc.) can be divided into the deputy leaves seal (Figure I) and Deputy impeller seal. When the pump is rotating, the impeller to generate pressure for the P out of the liquid, and then export the same time the flow of pressure to the packing room, so that media leaks out. However, Deputy Vice-impeller blades and the role, it creates a centrifugal force P1 'or P2 '. In the direction of the pressure P out of the impeller produces the opposite direction. Therefore, the liquid can leak out the top back. That in the sealed cavity of the "equal pressure seal " or "vacuum seal", so the pump to leak during operation. Because parking seals, pump in the parking can be sealed.

 1. deputy leaves the calculation of seal

 After the plane of the impeller cover open for a few radial rib, this is the deputy leaves. It maintained a small pump shell gap, the liquid is also similar to the angular velocity of the impeller rotation, rather than when it was not the deputy leaves one half of the angular velocity. This makes the role of liquid in the packing room at the reduced pressure.

 In the absence of the role of vice leaves, the rear panel liquid pressure distribution ABEF. We know that when the impeller blades, Deputy variation of the pressure generated is a parabola, as shown in Figure 3 in the KG. The resulting pressure is GKFG area.