Heat engineering; a text book of applied thermodynamics for engineers and students in technical schools . Change in Clearance Fig. 57.—Methods of changing the discharge from an air compressor of fixed speed. as well as three cards for three different clearances. The clear-ance is varied by automatically connecting different chambersto the cylinder heads as the pressure rises. This is controlled bythe governor as the pressure rises, necessitating a reduction in thequantity of air; the increase of clearance will cut down thequantity. When compressors are to be operated at differentpressures, the
Heat engineering; a text book of applied thermodynamics for engineers and students in technical schools . Change in Clearance Fig. 57.—Methods of changing the discharge from an air compressor of fixed speed. as well as three cards for three different clearances. The clear-ance is varied by automatically connecting different chambersto the cylinder heads as the pressure rises. This is controlled bythe governor as the pressure rises, necessitating a reduction in thequantity of air; the increase of clearance will cut down thequantity. When compressors are to be operated at differentpressures, the work of the steam cylinder is controlled by athrottle governor, a variable cut-off governor or by a Meyervalve gear. AIR COMPRESSORSMOTORS 151 The engines using compressed air may be of the regular formof engine or its equivalent. Fig. 58 shows the section through aLittle David riveter of the Ingersoll Rand Co. In this thethrottle valve A is controlled by the handle B which is pressedby the thumb of the operator allowing air to enter. The valve C. Fig. 58.—Little David riveter of Ingersoll-Rand Co. allows air to enter behind the piston D which is driven at a highspeed against the shank E which drives the rivet. The valve Cshown in black admits air to the groove at I and exhaust takesplace through the passage running from the left end of the passing through passages in the valve the exhaust leavesthrough the outlet to the left of C. When G is uncovered air
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1915
