Imperforate bowl: centrifugal separators – With means for furnishing auxiliary fluid to material or... – Liquid
Patent
1997-03-07
1999-02-02
Reifsnyder, David A.
Imperforate bowl: centrifugal separators
With means for furnishing auxiliary fluid to material or...
Liquid
494 40, 2103601, 2103801, B04B 1102
Patent
active
058657193
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention concerns a self-emptying centrifuge drum with at least one valve for releasing solids. The drum is actuated hydraulically by water introduced into a collecting channel through a fitting. The collecting channel rotates with the drum, and the fitting is stationary and has at least one outlet.
A drum of this type is known, from German 3 826 912 C1 for example. The water fitting extends in the form of an enclosed channel into the area radially inside the collecting channel. The spindle that rotates the drum extends through the same area. The inside diameter of the collecting channel is accordingly dictated by the diameter of the spindle and by the radial length of the water fitting in the vicinity of the collecting channel. The stationary fitting must also be far enough from the rotating collecting channel and from the rotating spindle. Since an enclosed channel takes up a lot of space radially with its wall and free cross-section, the inside diameter of the collecting channel must accordingly be longer. The greater the capacity of the collecting channel, however, the weaker the hydraulic pressure generated by the water flowing into the collecting channel. Attempts are accordingly made to keep the diameter of the collecting channel as short as possible.
Making the water fitting a double-walled ring surrounding the spindle in the vicinity of the collecting channel has also been proposed, in German OS 1 532 676 for instance. This makes it possible to decrease the radial length of the water fitting without altering the open cross-section that the water flows through. The same design allows several water outlets in the vicinity of the collecting channel, facilitating the introduction of water into the collecting channel. Water fittings of this type are complicated, however, and always require the collecting channel to be relatively wide. All double-walled water fittings, furthermore, entail the risk of constricting the flow with deposits of dirt or lime.
SUMMARY OF THE INVENTION
The object of the present invention is a simple and cost-effective water fitting with a collecting channel that has an inside diameter smaller than that of the known fittings.
This object is attained in accordance with the present invention by means of a baffle extending up from below the collecting channel and between it and the water fitting into an area radially inside the collecting channel, whereby the water outlet is aimed at the lower portion of the baffle.
The water flows up to the upper portion of the baffle, and water rushing out thereby is channeled into the collecting channel. The only radial length on the part of the water fitting that needs to be taken into account is the thickness of the baffle. The double wall employed in known water fittings is eliminated along with the space needed inside the wall to create an annular channel, or the inside of the enclosed channel, Much less space will accordingly be occupied radially than in known designs, and manufacturing costs can be greatly decreased. There is also much less risk of contaminating the water fitting.
The water outlet in one advantageous embodiment of the present invention slopes steeply up toward the surface of the baffle. The water on the baffle will accordingly flow upward.
The baffle in another advantageous embodiment is rotationally symmetric and concentric to the axis of rotation of the centrifuge drum. The rotating collecting channel generates turbulence in the air that distributes the water over the total circumference of the baffle. This feature optimizes the flow of water into the collecting channel.
The baffle in another advantageous embodiment has an upper portion that flairs radially out toward the collecting channel. The flow of water into the collecting channel from the baffle will accordingly be especially satisfactory.
The baffle in another advantageous embodiment constitutes a floor that separates the transmission housing from the drum housing above it. No partition is needed in this embodiment to k
REFERENCES:
patent: 3747840 (1973-07-01), Weiland
patent: 3938734 (1976-02-01), Wilke
patent: 4401429 (1983-08-01), Koslowski
patent: 4479788 (1984-10-01), Kohlstette
patent: 4717376 (1988-01-01), Bruning et al.
patent: 4781670 (1988-11-01), Kohlstette
patent: 4810374 (1989-03-01), Bruning et al.
Droste Johannes
Wegener Norbert
Reifsnyder David A.
Westfalia Separator AG
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