Patent ID: 8188608

Claim:
Ejector device effective to generate a negative pressure by means of compressed air that is fed to an ejector ( 1 ) included in the device via a compressed-air duct ( 2 ), furthermore comprising an air suction duct ( 3 ), a pressure sensor ( 18 ) arranged in the air suction duct as well as an electrically activatable valve member ( 5 ) arranged in the compressed-air duct and effective for the regulation of the flow of compressed air to the ejector, as well as electrically supplied control electronics ( 6 ) which at least is adapted to actuate the valve member in response to the pressure in the air suction duct detected by the sensor, furthermore comprising an energy-storing member ( 7 ) in the form of an accumulator by which the control electronics is supplied with electricity, characterized in that, in addition to the compressed-air duct ( 2 ) and the air suction duct ( 3 ), the device also comprises a charging air duct ( 9 ), which in a first end connects to the compressed-air duct and with another end opens at a generator ( 8 ) that, via the charging air duct ( 9 ), is in flow communication with the compressed-air duct ( 2 ) and is driven by compressed air for the generation of electrical energy, which is brought into the accumulator ( 7 ) for charging the same, and in that the first end of the charging air duct ( 9 ) connects to the compressed-air duct ( 2 ) downstream of the valve member ( 5 ), and in that the generator is driven in synchronization with a work cycle of the ejector for generating negative pressure.