Show A NEW AIR compressor WRITTEN FOR THE MINING REVIEW the accompanying engraving illustrates a new type of sullivan air compressor which is particularly suited to the requirements of mines and quarries as well as for industrial purposes of various kinds this machine is of the duplex pattern and is built in several combinations of steam and air by cylinders linders also for belt and power drive the dominant feature of these various types is the box frame with housing which forms a tight enclosure about the crank discs main bearings eccentrics connecting rods and cros crossheads this housing excludes dust and dirt and permits the use of a system of self lubrication of the principal working parts As shown in the sectional view an oil well is provided in each frame in which the lower edges of the crank discs are immersed the oil clinging to the discs is removed by scrapers in contact with their upper edges and thence con instead separate liners are forced into the castings thus precluding shrinkage strains the space between the liner and the aylin der forms the water jacket and outside of this again is the air inlet passage incoming air is thus admitted to the cylinder without contact with heated walls the air cylinder heads are also water jacketed and in two stage compressors an efficient is provided consisting of a nest of cold water tubes made of copper with whose cold surface the air is forced to come into intimate contact in passing from the low to the high pressure cylinder the inlet valves on all air cylinders are of the semi rotary or corliss type and are ara moved by steel valve stems connected by adjustable connecting rods to independent eccentrics on the engine shaft the moving parts start from and arrive at the ends V aft k 1 RR I 1 ft keyed by means of a storage chamber and suitable pipes to the main journals crank pins eccentrics and crosshead guides being finally returned to the well by gravity to be used again these machines require the minimum of attention and care as it is necessary to add oil to the wells only at long intervals these compressors are very compactly and substantially built all sizes except those of largest capacity are mounted on a heavy sub base in which the and steam on cross compound machines are situated the frames are of the heavy duty type or pattern with long bearings on the base securing rigidity and maintenance of correct alignment of working parts the steam valve gear is controlled by a meyer adjustable cutoff cut off the throttle being regulated by a sen sensitive stive steam and air governor the air cylinders are not cored out but of their travel with a slow and easy motion but at the points of opening and closing of the valves these parts attain their greatest speed it is thus possible for the valves to remain open during the entire stroke allowing the cylinder to fill with air at barometric pressure kressu re and trapping it instantly before the piston begins its return the valves themselves are made of close grained semi steel of large diameter fitted with accuracy provision is made to permit a thin film of air to get behind the closed valve pressing the cutting edges to the seat and making the valve tight against leakage the valve stems have T shaped heads on their inner ends carefully planed and fitted to the slots in the ends of the tho t e that valves the attachment is such valves are free to follow up wear automa without hindrance from the stenis stem through the these valves may be removed back ack bonnets without disturbing the setting 3 f the valve gear this valve gear is simle strong and durable is positive and reable in action and insures high volumetric ac efficiency the discharge valves are placed ron n top of the cyp linder head castings they are re set with removable seats in shallow ports orts or pockets as shown in the sectional iview I 1 lew of the class WE machine referred to dabove bove at a sufficient distance from the ends of the cylinder so that the piston travels completely past the openings to these pockets at each end of the stroke thereby re inducing clearance to the smallest amount possible os sible these valves are of the type ype internally guided on cast iron plugs md and held to their seats by light steel springs they are seated in bronze cages readily removable by unscrewing the valve plug As shown by the sectional view they are completely surrounded by water jackets in order to reduce the temperature of the air at its terminal pressure all working parts are constructed of materials which experience has shown to be best suited for their respective purposes and all parts of the machines are readily accessible for inspection or repair these air compressors are built in capacities pa cities ranging from to 2600 cubic feet of free air per minute the makers the sullivan machinery company of chicago state that they have erected large additions at their works at claremont N H for the proper manufacture of this type of compressor |