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Especially for pumps made for operation at relatively low flow rates, diffuser pumps outperform volute pumps efficiency wise. In addition to the higher maximum efficiency, the efficiency does not collapse as fast when operating in part load conditions.
Some centrifugal pumps contain diffusers. A diffuser is a set of stationary vanes that surround the impeller. The purpose of the diffuser is to increase the efficiency centrifugal pump by allowing a more gradual expansion and less turbulent area for the liquid to reduce in velocity.
This video describes the major parts and function of a centrifugal pump with a diffuser design and multi vane impeller.
What a cutwater is to a volute, vanes are to a diffuser. While volutes only have one (or sometimes two) points where the edge of the casing approaches the edge of the impeller in order to begin building pressure, diffusers often have many vanes.
In centrifugal pump technology, diffusers are frequently used on the discharge side of ring-section and volute casing pumps (see Pump casing), they are also used in multistage centrifugal pumps and as a component in piping runs.
24 sty 2012 · Diffuser versus volute. The stator section of a centrifugal pump, after flow exits the impeller, is usually either a ‘diffuser’ or a ‘volute’. The purpose of each of these two stator types is to efficiently diffuse velocity energy into pressure.
The purpose of the collector is to gather and diffuse the high velocity liquid discharged by the impeller. This process is necessary to (1) slow the liquid to a usable velocity and (2) convert the kinetic energy into pressure energy, thus recovering more of the pump's energy input.
