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Extra info for Vacuum and Pressure Systems Handbook
Sample text
Multistage versions are also available. A significant advantage for peripheral blowers is that they are highly immune to operating conditions that might otherwise cause blockage of inlet and discharge flows. They also provide oil-less operation and continuous pulse-free flow. 36 Figure 24 The arrows show the route air takes through a regenerative blower. Compressor Controls and Cycling Before we discuss compressor selection, it is necessary to look at how pressure is regulated in a pneumatic system.
Aftercooler - The immediate purpose of an aftercooler (Fig. 32) is to cool the air emerging from a compressor. By Charles' Law, this increases the amount of air that can be stored at a given volume and pressure. Both air-cooled and water-cooled models are available, depending on the amount of cooling required. Another problem the aftercooler solves is moisture. As the air entering the compressor is compressed, so is the accompanying water vapor. The partial pressure of water vapor increases sevenfold, for example, as the air containing it is compressed to 100 psig.
The compressor continues to deliver air at about the same pressure until the back-pressure exceeds that developed by the compressor. The result is "surge"-a reversal of flow. This reversal immediately allows the back-pressure to go down, and regular compression is resumed. 34 Surge can be prevented if flow remains above a limit established for each design. Various models have minimum operating flows between 45 and 90 percent of rated capacity. Centrifugal compressors are available in both small and very large sizes.