Portable blowing and suction air compressor

A portable blowing and suction air compressor, comprising:

• a motor;
• a piston, having a first end and a second end opposite to each other, the first end being connected to the motor;
• a sealing member, sheathed on an outer wall of the piston at the second end;
• a cylinder, wherein the second end of the piston is movably coupled to the cylinder, and the second end is in contact with an inner wall of the cylinder through the sealing member, wherein a cross section of the sealing member forms a plurality of contact zones on the inner wall and the outer wall respectively, a recess is formed between two adjacent one of the contact zones, and the cylinder has an air inlet pipe and an air outlet pipe connected to an inner space of the cylinder and connected to an exterior environment respectively;
• a first check valve, disposed in the air outlet pipe;
• and
• a second check valve, disposed in the air inlet pipe, wherein
• the motor drives the piston to reciprocate in the cylinder,
• during a first stroke, the piston compresses air in the cylinder, the compressed air drives the first check valve to clear a passage of the air outlet pipe to enter the air outlet pipe, and the compressed air drives the second check valve to block a passage of the air inlet pipe, and
• during a second stroke, the piston reduces air pressure in the cylinder, the compressed air in the air outlet pipe or air in the exterior environment drives the first check valve to block the passage of the air outlet pipe, and the air in the exterior environment or the air in the air inlet pipe drives the second check valve to clear the passage of the air inlet pipe to enter the cylinder through the air inlet pipe,
• wherein the piston comprises a rod, a disk, and an elastic portion, the rod has the first end, the disk has the second end, and the elastic portion is connected between the rod and the disk.