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Diffuser designs can be tailored for specific applications and can therefore be more efficient. In this case, the fluid pressure increases as fluid is expelled between a set of stationary vanes surrounding the impeller (Figure 3). The same basic principle applies to diffuser designs. This design causes the fluid pressure to increase towards the outlet (Figure 2). In a volute casing, the impeller is offset, effectively creating a curved funnel with an increasing cross-sectional area towards the pump outlet. The purpose in both designs is to translate the fluid flow into a controlled discharge at pressure. There are two basic designs of pump casing: volute and diffuser. The rotational motion of the impeller accelerates the fluid out through the impeller vanes into the pump casing. The impeller, on the opposite side to the eye, is connected through a drive shaft to a motor and rotated at high speed (typically 500-5000rpm). For fluids with entrained solids, an open or semi-open impeller (backed by a single disc) is preferred (Figure 1).įluid enters the impeller at its axis (the ‘eye’) and exits along the circumference between the vanes. These are normally sandwiched between two discs (an enclosed impeller). The impeller is the key component of a centrifugal pump. The pump casing is specially designed to constrict the fluid from the pump inlet, direct it into the impeller and then slow and control the fluid before discharge. The action of the impeller increases the fluid’s velocity and pressure and also directs it towards the pump outlet.
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Fluid enters the rapidly rotating impeller along its axis and is cast out by centrifugal force along its circumference through the impeller’s vane tips. Useful information on centrifugal pumps What is a centrifugal pump?Ī centrifugal pump is a mechanical device designed to move a fluid by means of the transfer of rotational energy from one or more driven rotors, called impellers.
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