How to choose between open, closed, and semi-open impellers
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A member mentioned the use of open impellers; I wonder when it is appropriate to use open, closed, or semi-open impellers? What are their strengths and weaknesses?
Open impellers have no covers on either side of the blades; they are simple to manufacture and easy to clean. They are suitable for transporting materials containing a large amount of suspended solids, but their efficiency is low and they cannot handle liquids at high pressures； The semi-open impeller has no cover on the suction side but one on the other side; it is suitable for transporting materials that tend to settle or contain particles, and its efficiency is relatively low ； A closed impeller has front and rear cover plates on both sides of the blades; it offers high efficiency and is suitable for transporting clean liquids free from impurities. Most centrifugal pump impellers are of this type. However, some media can easily cause blockages in their flow channels. Therefore, the choice of impeller depends entirely on the medium being transported.