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US 4,516,334 AGranted
Rotary dryer with rotary low-pressure syphon
OwnerWilhelm Wankeinventor
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OwnerWilhelm Wankeinventor
Estimating the term…
A rotary dryer for the drying of a moving web of material has a thin-walled shell with lateral heads and bearing journal at each end, and is heated internally with steam. For the discharge of condensate and flash steam a low-pressure syphon rotating with the shell is provided, consisting of syphon shoe, standpipe and outlet pipe. To keep the differential pressure required for the discharge of the mix of condensate plus flash steam as low as possible even in changing operating conditions the invention provides for the arrangement of an internal baffle in the center of the syphon shoe to convey the mix of condensate in flash steam and also to stabilize it. For this purpose the internal baffle may have as supplement also additional internal subdivision chambers. Furthermore, the invention also provides for the additional arrangement of steam jet nozzles. The rotary low-pressure syphon according to the invention (FIG. 2) is particularly effective at high production speeds for minimization of the differential pressure required for the discharge of the mix, furthermore for system stabilization in changing production conditions.
In a steam heated dryer drum adapted to rotate in two opposed bearing journals at its axis and provided with means for introducing steam into the interior thereof through one of said bearing journals and further provided with syphon means rotatable with said drum for removing condensate from the interior thereof through either of said bearing journals, said syphon means comprising an outlet pipe extending through said journal bearing communicating with a standpipe provided with a syphon shoe at its end adjacent the interior surface of said drum the chamber of which receives condensate therefrom and directs said condensate from its edge toward its center along a flow path essentially parallel to said drum surface;
Dependencies are inferred from the claim text.