公开(公告)号：WO2022260537A1

公开(公告)日：2022-12-15

申请号：PCT/NZ2022/050068

申请日：2022-06-07

Applicant: KAY, David Godfrey

Inventor： KAY, David Godfrey

IPC: F04F5/52 ,  F04F5/04 ,  F04F5/42

Abstract: An apparatus for generating a negative pressure has an upper flow director, an inlet for directing a driving liquid into the upper flow director, a lower flow director in fluid communication with the upper flow director, and a vacuum port. The upper flow director is shaped to induce a first spiralling flow in which the driving liquid flows in a generally inwardly and downwardly spiralling manner about a first spiral axis. The lower flow director is shaped to induce a second spiralling flow in a generally inwardly and upwardly spiralling manner about a second spiral axis. Flow of the driving liquid through the apparatus generates a negative pressure at the vacuum port.