What drives the pumping ring of a centrifugal pump?

Are you referring to the pumping ring of a mechanical seal? The pumping ring on the mechanical seal is generally fixed using set screws, although key drive is also used in some cases.

The pumping ring in the seal is fixed to the rotor and rotates together with it; it has a fixed rotation direction and is used as a mechanism for circulating the liquid – it is a miniature axial flow pump

The pumping ring is usually fixed to the shaft or sleeve and rotates together with the shaft.

A pumping ring is fixed to the rotating component by screws or threads; it is installed within a sealed chamber and operates as the rotating component turns, using centrifugal force or compression to drive the liquid into motion. The two main types commonly used are radial and axial. Radial type, through the action of centrifugal force. Axial type operates through the action of helical compression. In the API682 standard, for options 52 and 53, a pumping ring must be used. Whether it is axial or radial, there are certain technical requirements regarding the tolerances on dimensions, the number of eye holes, as well as the number of turns and angle of the screw; in particular, for axial types, attention must also be paid to the direction of rotation. Therefore, it’s not enough to simply have spirals and holes in order to achieve pumping and circulation; precise calculations and design by professional technicians are necessary to obtain satisfactory results. I hope my answer will satisfy you.

Mechanically sealed pumping rings are commonly used with high-temperature media, serving to pump the medium to heat exchangers or liquid storage tanks. There are many different forms, including slotted, blade-type, or threaded types. They can be fixed to the shaft or a shaft sleeve

The mechanical seal pumping ring is fixed to the shaft sleeve, which is mounted on the shaft. So you understand.