The liquid mixing pump manufacturer tells you that we divide the liquid in the pump into two parts: the liquid between the blades and the liquid in the flow channel. When the impeller rotates, under the action of centrifugal force, the peripheral velocity of the liquid in the impeller is greater than the peripheral velocity of the liquid in the flow channel, so a "ring flow" is formed.

The liquid mixing pump manufacturer tells you that since the liquid from the suction port to the discharge port moves forward with the impeller, the combined result of these two movements causes the liquid to generate the same "longitudinal vortex" as the impeller turns. It should be specially pointed out that the circumferential speed of the liquid particles in the pump body flow channel is less than the circumferential speed of the impeller.
The liquid mixing pump manufacturer tells you that during the longitudinal vortex process, the liquid particles enter between the impeller blades many times, and the energy is transferred to the liquid particles in the flow channel through the impeller blades. Each time the liquid particle passes through the blade, it gains energy. The liquid mixing pump manufacturer tells you that this is also the reason why the vortex pump has a higher lift than other vane pumps under the same outer diameter of the impeller. Not all liquid particles pass through the impeller, the "ring flow" weakens as the flow increases. When the flow is zero, the "ring flow" is the strongest and the lift is the highest. Because the liquid in the flow channel transfers energy through liquid impact.