The guide vane is the energy transfer device of the centrifugal pump. Its function is to collect the liquid from the impeller, reduce the flow velocity of the liquid, convert some of the velocity energy head into a pressure energy head, and then uniformly introduce the next stage or discharge through diffuser.
The vanes function the same as the volute and are mostly used in segmented multistage pumps. In a multistage centrifugal pump, the vanes are loaded into the middle section with the partition.
The guide vanes can be divided into radial guide vanes and flow passage guide vanes according to their structural forms. The positive guide vanes and the negative guide vanes of the flow guide vanes are cast together, and there is a continuous flow passage in the middle, so that the liquid flows in the continuous flow passage, and it is difficult to form dead angles and sudden diffusion, the speed changes are relatively uniform, and the hydraulic performance is better. But the structure is complicated.
