- Compressors: Selection and Sizing 3rd Edition
- by Royce N. Brown
- Heinz Bloch Recommended Reading List
- - Compressors, Third Edition: Selection and Sizing by Royce N. Brown
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Compressors: Selection and Sizing 3rd Edition
Used items may not include supplementary materials such as CDs or access codes. May show signs of minor shelf wear and contain limited notes and highlighting. More information about this seller Contact this seller 9. Published by Gulf Professional Publishing About this Item: Gulf Professional Publishing , Condition: New. On igure Cutaway of an oil-free helical-lobe rotary compressor. Courtesy of AC Compressor Corporation Overview 7 upercharged or multistage applications, pressures of psi are attainble.
The spiral-lobe version is limited to 10, cfm flow and about 15 si discharge pressure. The straight-lobe compressor is similar to the helical-lobe machine but much less sophisticated. As the name implies, it has two untwisted or traight-lobe rotors that intermesh as they rotate. Normally, each rotor air has a two-lobe rotor configuration, although a three-lobe version is vailable. All versions of the straight-lobe compressor use timing gears o phase the rotors. Gas is trapped in the open area of the lobes as the obe pair crosses the inlet port. There is no compression as gas is moved o the discharge port; rather, it is compressed by the backflow from the ischarge port.
Four cycles of compression take place in the period of ne shaft rotation on the two-lobe version. The operating cycle of the raight-lobe rotary compressor is shown in Figure Operating cycle of a straight-lobe rotary compressor. Modified, ourtesy of Ingersoll-Rand Volume range of the straight-lobe compressor is 5 to 30, cfm. Presure ranges are very limited with the maximum single-stage rating at 15 si. In a few applications, the compressors are used in two-stage form where the discharge pressure is extended to 20 psi. The sliding-vane compressor uses a single rotating element see Figure The rotor is mounted eccentric to the center of the cylinder portion f the casing and is slotted and fitted with vanes.
The vanes are free to Compressors: Selection and Sizing Figure Cross section of a sliding vane compressor. Courtesy of A-C Compressor Corporation move in and out within the slots as the rotor revolves.
by Royce N. Brown
Gas is trapped etween a pair of vanes as the vanes cross the inlet port. Gas is moved nd compressed circumferentially as the vane pair moves toward the disharge port. The port locations control the pressure ratio. This compresor must have an external source of lubrication for the vanes. The sliding-vane compressor is widely used as a vacuum pump as well s a compressor, with the largest volume approximately 6, cfm. The ower end of the volume range is 50 cfm.
Heinz Bloch Recommended Reading List
A single-stage compressor with tmospheric inlet pressure is limited to a 50 psi discharge pressure. In ooster service, the smaller units can be used to approximately psi. The liquid piston compressor, or liquid ring pump as it is more commonly called, uses a single rotor and can be seen in Figure The rotor onsists of a set of forward-curved vanes.
The inner area of the rotor conains sealed openings, which in turn rotate about a stationary hollow nner core. The inner core contains the inlet and discharge ports. The otor turns in an eccentric cylinder of either a single- or double-lobe esign. Liquid is carried at the tips of the vanes and moves in and out as he rotor turns, forming a liquid piston.
The port openings are so located s to allow gas to enter when the liquid piston is moving away from cener. The port is then closed as rotation progresses and compression takes lace, with the discharge port coming open as the liquid piston approachs the innermost part of the travel. A sectional and end view of a liquid piston compressor.
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Courtesy of Nash Engineering Co. In the two-lobe design, two compression ycles take place during the course of one rotor revolution. The capacity range is relatively large, ranging from 2 to 16, cfm.
- Compressors, Third Edition: Selection and Sizing by Royce N. Brown
Like the sliding-vane compressors, the liquid piston compressor is widey used in vacuum service. The compressor is also used in pressure service with a normal range of 5 to 80 psi with an occasional application up o psi. Because of the liquid piston, the compressor can ingest liquid n the suction gas without damage. This feature helps offset a somewhat poor efficiency.