Centrifugal Pump Classification by Flow
Centrifugal pumps can be classified based on the manner in which fluid flows through the pump. The manner in which fluid flows through the pump is unswayable by the diamond of the pump casing and the impeller. The three types of spritz through a centrifugal pump are radial flow, midmost flow, and mixed flow.
Radial Spritz Pumps
In a radial spritz pump, the liquid enters at the part-way of the impeller and is directed out withal the impeller blades in a direction at right angles to the pump shaft. The impeller of a typical radial spritz pump and the spritz through a radial spritz pump are shown in Figure 6.
Fig 6 Radial Flow Centrifugal Pump
Axial Spritz Pumps
In an midmost spritz pump, the impeller pushes the liquid in a direction parallel to the pump shaft. Midmost spritz pumps are sometimes tabbed propeller pumps considering they operate substantially the same as the propeller of a boat. The impeller of a typical midmost spritz pump and the spritz through a radial spritz pump are shown in Figure 7.
Fig 7 Axial Flow Centrifugal Pump
Mixed Spritz Pumps
Mixed spritz pumps infringe characteristics from both radial spritz and midmost spritz pumps.
As liquid flows through the impeller of a mixed spritz pump, the impeller blades push the liquid out yonder from the pump shaft and to the pump suction at an wile greater than 90o. The impeller of a typical mixed spritz pump and the spritz through a mixed spritz pump are shown in Figure 8.
Fig 8 Mixed Flow Centrifugal Pump
Multi-Stage Centrifugal Pumps
A centrifugal pump with a single impeller that can develop a differential pressure of increasingly than 150 psid between the suction and the venting is difficult and plush to diamond and construct. A increasingly economical tideway to developing upper pressures with a single centrifugal pump is to include multiple impellers on a worldwide shaft within the same pump casing. Internal channels in the pump casing route the venting of one impeller to the suction of flipside impeller.
Figure 9 shows a diagram of the wattle of the impellers of a four-stage pump. The water enters the pump from the top left and passes through each of the four impellers in series, going from left to right. The water goes from the volute surrounding the venting of one impeller to the suction of the next impeller.
A pump stage is specified as that portion of a centrifugal pump consisting of one impeller and its associated components. Most centrifugal pumps are single-stage pumps, containing only one impeller. A pump containing seven impellers within a single casing would be referred to as a seven-stage pump or, or generally, as a multi-stage pump.
Fig 9 Multi Stage Centrifugal Pump