Air intake structure for reciprocating compressor

This invention relates to an air intake structure for reciprocating compressor, which the low-temperature, low-pressure refrigerant gas coming from evaporator and entering the compressor can be sucked into the compressing cylinder directly and fast via a low-pressure refrigerant intake pipe to perform the compression movement, without being mutually mixed with the high-temperature refrigerant gas in the compressor, so as to maintain the low temperature and high gas density status like just entering the compressor, so that during the process of the refrigerant gas being compressed into high-temperature, high-pressure by the piston, the required compression work can be lowered and the loading of the condenser can be reduced, so as to enhance the system efficiency.