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N2 Fitting and Machining Theory|Hands-On! 127 outlet housing
two lobes flow in
threelobes flow in
lobe
flow out
inlet Figure 10.14 Lobe compressors
Single and multi-stage centrifugal compressors Figure 10.15 shows a single stage centrifugal pump with the intake at the centre and the outlet at the leſt top of the housing.
Te impellers rotate as indicated and force the air to the outlet port, the faster it rotates the greater the delivery rate and pressure.
output air out
air forced onto rim of impeller
intake impeller
air enters in center
Figure 10.15 Single stage centrifugal pump
In the case of a multi-stage centrifugal compressor as seen in Figure 10.16, the air passes from stage to stage, the pressure increasing at each stage. Te housing is manufactured in two halves, each accurately cast and then machined to exact dimensions before the main shaſt with impellers mounted on it, is fitted.