各种空调压缩机的优缺点（Advantages and disadvantages of various air conditioning compressors）.doc

各种空调压缩机的优缺点（Advantages and disadvantages of various air conditioning compressors） 1.5.1. Piston compressor (1) operation principle of piston compressor When the crankshaft rotates, the piston compressor through the connecting rod drive, piston reciprocating motion, it consists of the inner wall of the cylinder, cylinder head and piston top surface of working volume will change periodically. Piston compressor piston from cylinder head start, the work within the cylinder volume increases gradually, at this time, the gas along the inlet pipe, pushed open the inlet valve into the cylinder, until the work gets to maximum volume, the inlet valve close; Reverse movement, piston compressor piston within the cylinder working volume shrinking, gas pressure, when the pressure in the cylinder is achieving and slightly higher than the exhaust pressure, the exhaust valve opens, the gas discharge cylinder, until the piston movement to the limit position, the exhaust valve closed. When the piston compressors piston is moving again, the process repeats. In conclusion, the crankshaft of the piston compressor is rotated for a week, and the piston reciprocates once, and the process of air intake, compression and exhaust is realized in the cylinder, which is the completion of a work cycle. (2) advantages of piston compressor (1) regardless of the traffic volume, it can get the pressure required, the exhaust pressure range is wide, the maximum pressure can reach 320MPa (industrial application), even 700MPa, (in the laboratory); (2) single machine capacity for any discharge under 500m3 / min; (3) in the general pressure range, the requirement of the material is low, and the ordinary steel materials are adopted, the processing is easier and the cost is lower; (4) the thermal efficiency is high, and the thermal insulation efficiency of the general and medium-sized units can reach about 0.7 to 0.85. (5) when the air volume is adjusted, the adaptability is strong, that is, the exhaust range i