EJECTOR HAVING AN ACTUATION MECHANISM WITH A PILOT VALVE AND AN EQUALIZATION PASSAGE BETWEEN TWO CYLINDER CHAMBERS

The present invention relates to an ejector (1), e.g. for a refrigerant circuit, with a primary inlet (2), a secondary inlet (7), an outlet (12), a nozzle (5), and a mixing portion (6, 10). The ejector (1) comprises an actuating mechanism (30) moving a needle (20) between an opened position and a closed position. For ensuring smooth opening and closing, the actuation mechanism (30) comprises a piston (31) in a cylinder (35), wherein a first cylinder chamber (37) is in fluid communication with the primary inlet (2) and a second cylinder chamber (38) is in fluid communication with the first cylinder chamber (37) via an equalization passage (32). The second cylinder chamber (38) is in fluid communication with the secondary inlet (7) and/or the outlet (12) via a drain passage (39, 53, 54, 55, 56, 57) when a pilot valve (50) arranged in the drain passage (39, 53, 54, 55, 56, 57) is in an open state.