Single-action type piston compressor and air inlet control method thereof

The invention discloses a single-action type piston compressor and an air inlet control method thereof. The single-action type piston compressor comprises an air cylinder and a piston arranged in theair cylinder, wherein the cavity of the air cylinder is divided by the piston to form an interior air suction cavity as an air suction volume; the interior air suction cavity is formed in the reverseside of the piston; an air suction opening with an air suction valve is formed in the piston; the interior air suction cavity is connected with an exterior air suction cavity through an airflow through hole; a switching mechanism is arranged on the airflow through hole; the piston is connected with a crankshaft through a connecting rod; the piston is driven by the crankshaft to do reciprocating motion; when the air cylinder sucks the air, the air in the air cylinder expands, the piston moves downwards, and the switching mechanism on the airflow through hole is closed, so that the interior airsuction cavity and the exte