Vacuum self priming pump

A vacuum self priming pump comprising:

• a motor;
• an impeller rotating by the motor;
• a body for receiving the impeller and provided with fluid inlet and outlet and an air exhaust tube;
• and
• a diaphragm that is installed to suck air into the body through the air exhaust tube,
• wherein the vacuum self priming pump further comprises:
• an actuating member that is installed in an outlet by a hinge shaft to be capable of rotating and configured to be quickly opened by water pressure when water is discharged through the outlet;
• an arm that extends from the actuating member to an external side over the outlet;
• a clutch unit that is movably formed in a length direction of a rotational shaft of a motor to selectively transfer power to an eccentric wheel to free-rotate the eccentric wheel on the rotational shaft;
• and
• a transferring unit that is installed between the arm and the clutch unit to cut off the power from the clutch unit to the eccentric wheel when the arm moves.