Application of fluid dynamic sealing technology for gear pump impeller

The so-called gear pump; The secondary impeller fluid dynamic seal refers to the installation of an open impeller in the opposite direction of the same axis near the back cover plate of the pump impeller. When the pump is working, the secondary impeller rotates together with the pump spindle, and the liquid in the secondary impeller also rotates. The rotating liquid generates an outward centrifugal force, which on the one hand resists the liquid flowing towards the mechanical seal and reduces the pressure at the mechanical seal. On the other hand, it prevents solid particles in the medium from entering the friction pair of the mechanical seal, reduces the wear of the mechanical seal grinding block, and extends its service life.