Centrifugal pumps contain 2 pieces called the rotor and the stator. The rotor draws fluid in to the center where rotating blades fling the fluid outward. The stator sits around the rotor and gathers the fluid and redirects it to a common outlet to build pressure, if the stator wasn't there the fluid would fling out in all directions.
The underlying principle is the rotating blades impart energy to the fluid to create velocity and the stator redirects it to create pressure. Picture a block of water sitting on the floor at the bottom of the ramp, now picture pushing the ramp under the block of fluid, push it hard enough and the block of water slides up the ramp and goes flying in the air. The rotor works like like the ramp being pushed under the fluid and sending it flying the stator then catches the fluid and directs it to where it is useful Centripetal pumps draw fluid in at the periphery and expel it at the center axis.
Upon further searching it seems like there aren't that many actual centripetal pumps out there, just many mislabeled centrifugal ones, so information is somewhat limited. The link below is the best visual comparison I could find.
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