| 摘要 |
In an apparatus for delivering selectable amounts of dust-laden gas, the base structure thereof includes support means having a substantially horizontal and circular recess in which is rotatably supported a circular disk having a plurality of transverse openings defining a circle coaxial with the disk. A cover partially covers the disk and has a dust container mounted thereon for selective communication with the transverse openings in the disk. The dust container and the circular recess define a substantially airtight chamber. A pair of coaxial openings are provided through the cover and support means for successive alignment with the transverse openings as the disk rotates and are in communication with a source of pressurized gas, whereby pressurized gas can be directed through a dust-laden transverse opening which is aligned with the coaxial openings. A leakage space is provided between the disk and cover so that when no transverse opening is aligned with the coaxial openings, the pressurized gas passes through the leakage space into the dust container.
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