Compressed air production; or, The theory and practice of air compression . e used, some of them of the Corlisspattern; but for the purpose of insuring stability, freedom from breakage,and to resist the sudden strains which are brought to bear during com-pression, the frames, bearings and fly wheels are usually heavy. The steamand air pistons are in some patterns tied together by a heavy cast ironsole plate and tie rod. The bearings are usually of phosphor bronze, areunusually broad, and are provided with means for taking up wear. Thecranks are usually made of wrought iron, and the crank pins,
Compressed air production; or, The theory and practice of air compression . e used, some of them of the Corlisspattern; but for the purpose of insuring stability, freedom from breakage,and to resist the sudden strains which are brought to bear during com-pression, the frames, bearings and fly wheels are usually heavy. The steamand air pistons are in some patterns tied together by a heavy cast ironsole plate and tie rod. The bearings are usually of phosphor bronze, areunusually broad, and are provided with means for taking up wear. Thecranks are usually made of wrought iron, and the crank pins, crosshead 54 COMPRESSED AIR PRODUCTION. phi, piston rods, shafts, valve rods, links and pins, and all wearing parts,are of steel, and when possible this is hardened and ground. The heavyfly wheel gives a smooth, uniform motion, and aids in steam economy byadmitting of early cut-off. When running one side of the compressor ata time, the fly wheel prevents irregularity of motion. In this type of com-pressor the air cylinders are usually fitted with poppet valves, although. FIG. 25. manufacturers have succeeded in so far perfecting the positive movedvalve and the piston inlet that they are applied with economy to the MeyerDuplex machines. The air cylinder is sometimes made Of hard brass,owing to the better conductivity of this material, and is as thin as can bemade with safety. The cylinders of some machines are provided withjackets for water circulation, and the piston and piston rods are hollow. COMPRESSED AIR PRODUCTION. 55 A telescopic water tube is introduced at the back end of the cylinder, andcold water is supplied to aid in keeping- down the temperature duringcompression. The introduction of cold water in this way undoubtedlyreduces the heat of compression, but it is subject to the many disad-vantages found in water injection. The water, unless free from foreignmatter, is liable to destroy the cylinder, and even when pure it is dif-ficult to lubricate the parts, the water
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Keywords: ., bookcentury1800, bookdecade1890, bookid, booksubjectcompressedair
