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| Centrifugal Pump Diffuser |
Some centrifugal pumps contain Centrifugal Pump Diffuser . A diffuser is a set of stationary vanes that surround the impeller. The purpose of the diffuser is to increase the efficiency of the centrifugal pump by allowing a more gradual expansion and less turbulent area for the liquid to reduce in velocity. The diffuser vanes are designed in a manner that the liquid exiting the impeller will encounter an everting creasing flow area as it passes through the diffuser. This increase in flow area causes a reduction in flow velocity, converting kinetic energy into flow pressure.
Impellers of pumps are classified
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| impellers |
Single-Suction and Double-Suction Impellers
based on the number of points that the liquid can enter the impeller and also on the amount of webbing between the impeller blades.
Impellers can be either single suction or double-suction. A single-suction impeller allows liquid to enter the center of the blades from only one direction. A double-suction impeller allows liquid to enter the center of the impeller blades from both sides simultaneously. Figure shows simplified diagrams of single and double-suction impeller
Impellers can be open, semi-open, or enclosed. The open impeller consists only of blades attached to a hub. The semi-open impeller is constructed with a circular plate (the web) attached to one side of the blades. The enclosed impeller has circular plates attached to both sides of the blades. Enclosed impellers are also referred to as shrouded impellers. Figure illustrates examples of open, semi-open, and enclosed impellers.
open, semi-open, or enclosed
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