초록 ▼

An auger venturi conveying system for particulate materials includes a hopper-fed auger conveyor section for transporting the particulate material toward the discharge end of a barrel and a venturi arrangement for non-turbulent mixing of the material transported through the barrel with a pressurized

An auger venturi conveying system for particulate materials includes a hopper-fed auger conveyor section for transporting the particulate material toward the discharge end of a barrel and a venturi arrangement for non-turbulent mixing of the material transported through the barrel with a pressurized gas flow. The venturi arrangement comprises a plenum chamber surrounding the barrel of the auger conveyor section adjacent the discharge end, a venturi pipe coupled to the plenum chamber having a tapered section leading to a constriction, and a jet member within the venturi pipe coupled to the discharge end of the barrel and extending approximately to the constriction. The outer surface of the jet member cooperates with the interior surface of the tapered section of the venturi pipe to form a narrow annular passage between the plenum chamber and the constriction of the venturi pipe. The venturi pipe is coupled at its other end to a conduit. A gas flow is created in the venturi pipe by introducing a pressurized gas into the plenum chamber. The width of the annular passage is adjusted to obtain a desired pressure difference between the plenum chamber and a region of the conduit adjacent the venturi pipe. Blowback prevention is achieved in the system by providing pressure transducers in the plenum chamber and in the region of the conduit adjacent the venturi pipe, and a controller responsive to the signals from the pressure transducers for reducing the rotational speed of the auger conveyor if the pressure difference falls below a specified value.

대표청구항 ▼

A conveying system for particulate material comprising: a cylindrical barrel having first and second ends; an auger conveyor rotatably mounted within the barrel; means for supplying the particulate material to the auger conveyor; means for rotating the auger conveyor in an appropriate direction so a

A conveying system for particulate material comprising: a cylindrical barrel having first and second ends; an auger conveyor rotatably mounted within the barrel; means for supplying the particulate material to the auger conveyor; means for rotating the auger conveyor in an appropriate direction so as to transport the particulate material towards the first end of the barrel; a plenum chamber surrounding the barrel adjacent the first end thereof; a venturi pipe coupled to the plenum chamber and enclosing the first end of the barrel, the venturi pipe having a first tapered section leading directly to a relatively short constriction located beyond the first end of the barrel and a second tapered section of increasing cross-sections directly downstream of the constriction; a jet member within the venturi pipe coupled to the first end of the barrel and extending substantially adjacent to the constriction, the jet member having an outer surface appropriately shaped to conform with the interior surface of the first tapered section of the venturi pipe to form a relatively narrow annular passage from the plenum chamber to the constriction, the jet member having an axial bore for channeling the particulate material transported by the auger conveyor into a region substantially adjacent the constriction of the venturi pipe; means for introducing a pressurized gas into the plenum chamber; and means for coupling the venturi pipe to a conduit.