Patent Application
20150369537
This invention is directed to a narrowing column divider and more particularly to a column narrowing divider for a continuous-flow grain dryer.
Continuous-flow grain dryers are well-known in the art for dryers 10 having a column 12 with a split plenum, as shown in
An objective of the present invention is to provide a grain dryer that improves the efficiency of drying grain.
Another objective of the present invention is to provide a grain dryer that restricts airflow from wrapping around the plenum divider 25 within a column from a high pressure to a low pressure plenum.
A still further objective of the present invention is to provide a grain dryer that better utilizes heated air.
These and other objectives will be apparent to those of ordinary skill in the art based upon the following written description, drawings, and claims.
A grain dryer having a column with an interior wall, an exterior wall, an inlet and an outlet. The column has an upper heated pressurized plenum and a lower, low pressure, suction plenum. Attached to the interior wall within the column is a narrowing divider that increases the path of the heated air at the pressure gradient.
Referring to the Figures, a continuous-flow grain dryer 10 has a plurality of columns 12 having an interior wall 14, sidewalls 15 and an exterior wall 16. Grain is received in an inlet 18 of column 12 and flows downwardly to an outlet 20.
The dryer 10 has an upper or heated pressurized plenum 22 for drying the grain and a lower or suction plenum 24 for cooling the grain separated by a plenum divider 25. Positioned within the column 12 is a narrowing divider 26. The narrowing divider 26 is of any structure and shape and preferably has a triangular profile. The divider 26 is attached to the interior wall 14 and the sidewalls 15 between the pressure 22 and suction 24 plenums and extends partially within the column. In one embodiment, the narrowing divider 26 is laser cut from steel and then bent to a specific angle to facilitate grain movement. The angle may change depending on the type of grain.
In operation, grain is received through the inlet 18 and flows through column 12 to outlet 20. As air flows, as shown by arrows P, heated pressurized air flows out of the pressure plenum 22 through interior wall 14 toward the exterior wall 16 where most of the heated air exits.
Simultaneously, cool ambient air, as shown by arrows S, flows into the suction plenum 24 through exterior wall 16 toward the interior wall 14 through a suction or vacuum force.
The narrowing divider 26 reduces the pressure gradient experienced by the air within the vertical grain column 12 between plenum 22 and plenum 24. The amount of air that experiences the pressure gradient is reduced which improves heated exhaust airflow and cooling airflow intake. The narrowing divider 26 increases the length of the path that the heated air P must take to get to the suction plenum 24 which results in more heated air exiting from the pressure plenum 22 through grain column 12 and directly through outer wall 16 increasing drying capacity and cooling. Less hot air also will return to the fan (not shown) for recycling which improves the cooling capacity of the dryer and reduces the relative humidity of the working heated air.
Thus a column narrowing divider for a continuous-flow dryer has been disclosed that at the very least meet all the stated objectives.
