Reciprocating Compressor salemmbrothers（往复式压缩机salemmbrothers）.pptVIP

By SYED ASGHAR ABBAS NAQVI Reciprocating Compressor In a reciprocating compressor, a volume of gas is drawn into a cylinder, it is trapped, and compressed by piston and then discharged into the discharge line. The cylinder valves control the flow of gas through the cylinder; these valves act as check valves. There are two types of reciprocating compressor. Reciprocating CompressorTypes Single – Acting compressor It is a compressor that has one discharge per revolution of crankshaft. Double – Acting Compressor It is a compressor that completes two discharge strokes per revolutions of crankshaft. Most heavy-duty compressors are double acting.. Reciprocating Compressor Different parts of double acting compressor are listed below. Suction valve. Suction gas jacket. Piston. Cylinder. Discharge valve. Discharge gas jacket Construction of Reciprocating Compressors Reciprocating compressors can be divided into two main groups. Gas end. Power end. Gas End GAS END Parts of the reciprocating compressor that handle process gas are grouped in this category. Cylinder Liner Piston reciprocates inside a cylinder. To provide for reduced reconditioning cost, the cylinder may be fitted with a liner or sleeve. A cylinder or liner usually wears at the points where the piston rings rub against it. Because of the weight of the piston, wear is usually greater at the bottom of a horizontal cylinder. A cylinder liner is usually counter bored near the ends of the outer ring travel i.e. counter bores are made just ahead of the points where the end piston rings stop and reverse direction. Shoulders may form in the liner where the ring’s travel stops unless counter bores are provided. Piston For low speed compressors (upto 330 rpm) and medium speed compressors (330-600 rpm), pistons are usually made of cast iron. Upto 7” diameter cast iron pistons are made of solids. Those of more than 7” diameters are usually hollow (to reduce cost). Carbon pistons are sometimes used