Cylinder structure of reciprocating pump

The utility model discloses a cylinder structure of reciprocating pump, including the cylinder, set up the last cylinder body of cylinder upper end, setting at the lower cylinder body of cylinder lower extreme, be used for suction gas's intake pipe and be used for the blast pipe of exhaust gas jar, be provided with the air cavity in the cylinder, be provided with piston and cock stem in the air cavity, the piston cup joints to slide on the cock stem and with the air cavity to be connected, cock stem downwardly extending runs through to descend the cylinder body to deviate from the bottom surface of cylinder, upward be provided with first air inlet duct, first air discharge duct in the cylinder, be provided with second air inlet duct, second air discharge duct down in the cylinder body. Beprovided with in the first air inlet duct and be used for the air feed body to flow in the first check valve of air cavity, be provided with in the second air inlet duct and be used for the air feed body to flow in air cavity