Products Description
The function of guide vanes is the same as that of volutes, and they are mostly used in segmented multi-stage pumps. In a multi-stage centrifugal pump, the guide vanes are installed in the middle section with a partition.
The guide vanes can be divided into radial guide vanes and channel guide vanes according to their structural forms. The forward and reverse guide vanes of the channel type guide vanes are cast together, with a continuous flow channel in the middle, which allows liquid to flow in the continuous flow channel, making it difficult to form dead angles and sudden diffusion. The speed change is relatively uniform, and the hydraulic performance is good, but the structure is complex and the manufacturing process is poor.
The guide vanes are mostly used in reverse flow situations in hydraulic machinery, such as the movable guide vanes of water turbines, fixed guide vanes, and guide vanes in water pumps. Their function is to generate circulation (note: fixed guide vanes can also generate partial circulation, and many academic circles may not yet accept the function of fixed guide vanes).
Now let's explain why the head of axial flow pumps has not reached the ideal state, even when there are infinitely many blades. The reason for this is actually that the backflow of the guide vanes is not very good, and a blade passage vortex is generated in the middle of the blade passage, which is equivalent to the existence of axial swirl in centrifugal pumps, affecting the head.
The guide vane is one of the most important castings and forgings in the water guide mechanism of hydroelectric generator units, and its manufacturing has always been a major challenge faced by the manufacturing of large hydroelectric units. In the past, guide vanes were mostly produced by sand casting, and the internal quality of the castings was unstable, which was prone to common casting defects such as shrinkage, porosity, porosity, inclusions, and cracks.
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