TROCHOID PUMP WITH AIR DISCHARGE PORT

摘要

An air ejection port (22) for ejecting air-mixed oil is structured with a first air ejection port (22 -1 ) provided on the inner peripheral side from an inscribed circle (31) of an outer rotor (2) and a second air ejection port (22 -2 ) provided on the outer peripheral side from a circumscribed circle (32) of the inner rotor (3), the air ejection port (22) can have an enlarged port area as the total of area of the first air ejection port (22 -1 ) and area of the second air ejection port (22 -2 ) in a state without being in communication with either of a suction port (21) and a discharge port (23), and a disadvantage that a pump chamber of a previous process and a pump chamber of a subsequent process communicate with each other through the air ejection port (22) can be avoided.