| 摘要 |
An aeration apparatus (10, 10A, 10B, 10C) to ease the emptying of a mass (M) of powdered material from any kind of container (101). The apparatus comprises a vibrating membrane (30) coupled to a device (40) for pulling and fastening it to the container (101) wall, so that said membrane (30) adheres to the inner surface of the container (101) wall. The apparatus is characterized in that the inner surface of membrane (30) has a number of grooves shaped as radial recesses (30B) formed only on the lower half of the inner surface of the membrane (30) itself. Each radial section (30E) of any radial recess (30B) is advantageously venturi-shaped. |
