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1. (WO2018162542) SWITCHED SUCTION JET PUMP

Pub. No.:    WO/2018/162542    International Application No.:    PCT/EP2018/055584
Publication Date: Fri Sep 14 01:59:59 CEST 2018 International Filing Date: Thu Mar 08 00:59:59 CET 2018
IPC: F04F 5/00
F04F 5/46
Applicants: POLYTEC PLASTICS GERMANY GMBH & CO. KG
Inventors: BERDING, Christian
LESON, Christoph
Title: SWITCHED SUCTION JET PUMP
Abstract:
The invention relates to a single-stage or multistage suction jet pump comprising a propelling nozzle (5), one or more suction nozzles (2), a diffuser (7), and a volume flow limiting valve in or directly in front of the propelling nozzle. The volume flow limiting valve has a valve element (4) in the overpressure region (1) of the suction jet pump, said valve element having an opening (8) with a cross-sectional area which is smaller than the cross-sectional area of the propelling nozzle (5). The valve element spans at least one additional gap opening (9) which first releases the cross-section of the gap opening (9) when the pressure difference between the overpressure region (1) and the suction region (2) increases and which switches in the event of a defined large pressure drop and the valve element (4) reduces or closes the cross-section of the gap opening (9) such that the volume flow flowing over the opening (8) is limited to a defined level even in the event of a further increasing pressure difference.