Pneumatic distributor of granular and/or powdery materials, in particular for sowing machines
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United States of America Patent
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Aug 19, 2008
Grant Date -
Aug 9, 2007
app pub date -
Aug 26, 2003
filing date -
Aug 26, 2003
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pneumatic distributor of granular and/or powdery materials includes a main distribution duct having a first end in the region of which an air-flow is injected into the duct under pressure, and a second end. The main duct includes respective adjacent converging-diverging portions, with reference to the direction of the air-flow, defining a Venturi duct. A dosing device is provided for delivering a metered quantity of material into the main duct in the region of the narrow cross-section of the Venturi duct, for the mixing of the material into the air-flow and the entrainment of the mixture obtained towards the second end. The distributor includes at least one auxiliary duct, bypassing the Venturi duct, in order to connect a section of the main duct disposed upstream of the Venturi duct to a section of the main duct disposed downstream of the Venturi duct.
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