Air inlet valve for integrated variable-frequency screw air compressor

The utility model relates to an air compressor part, in particular to an air inlet valve for an integrated variable-frequency screw air compressor, which solves the use problem of the air inlet valve.The valve comprises an outer valve body, a fixed valve body, a check valve rod, a piston and a sealing top, an adjusting cavity is formed in the outer valve body, a mounting cavity allowing the sealing top, the piston and the fixed valve body to be mounted in sequence is formed in the lower portion of the outer valve body, an exhaust access port is formed in the outer wall of the upper portion ofthe outer valve body, and the exhaust access port, the adjusting cavity and the mounting cavity are sequentially communicated. The check valve rod is arranged in the adjusting cavity, the exhaust inlet and the adjusting cavity are shielded and separated through movement of the check valve rod, a movable cavity is formed between the sealing top and the fixed valve body, the piston is arranged in the movable cavity in a sli