| 摘要 |
The invention relates to a pneumatic vacuum in which an ejector (10) exhibits a tubular conduit (11) for injection of compressed air, a discharge channel (12) for discharging the aspirated fluid and the compressed air injected via the tubular conduit (11), an aspirating channel (13) in fluid communication with the tubular conduit (11) and the discharge channel (12) for aspirating; the ejector (10) has a first and a second tubular body (17, 24) exhibiting a first converging portion (20, 25) arranged downstream of an inlet zone (18) along an aspirating direction (21) and a second portion (22, 26) having a constant section emerging from the first converging portion (20, 25) at the smaller-section zone (23, 27) and downstream of the first portion (20, 25) along the aspirating direction (21), the tubular conduit (11) for injecting the compressed air exhibiting an inlet mouth (28) located at the converging portion (25) of the second tubular body (24) such as to inject pressurised air into the second tubular body (24). |
