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| Penetrating endoscope |
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Concentric tubular centrifuge
| Details |
Inventors: Cornay, Paul J.;
Assignee: ERTH Technologies, Inc. (Longmont, CO)
Primary Examiner: Cooley; Charles E.
Assistant Examiner:
Attorney, Agent or Firm: Dorsey & Whitney LLP
A centrifuge for decanting lighter material from heavier material from a mixture of initial material includes a housing having a central body and a hollow arm extending from the body, the arm having a first end attached to the central body, and a second end extending away from the central body, and an end cap attached to the second end of the arm to form a chamber in the arm. A baffle is attached to the body and extends into the chamber, the baffle having a longer inner tube having an interior and a distal end, and a shorter outer tube. The longer tube is positioned inside the shorter tube and defines an inner space therebetween. An outer space is defined between the shorter tube and the hollow arm. An entrance path for the mixture of initial material is formed in the housing and communicates with the inner space. An exit path for the light material is formed in the housing and communicates with the outer space. An exit path for the heavier material is formed in the housing and includes the interior of the longer tube. A plug is formed in the chamber adjacent the end cap to engage the distal end of the longer tube and define a flow path to guide the lighter material to the light material exit path. |
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DETAILED DESCRIPTION A concentric tubular centrifuge 20, as shown and depicted in FIGS.
1-18, is designed to continuously separate large volumes of sludge, such as waste water and oil well drilling fluids.
The centrifuge 20 is constructed of at least two laterally opposed, axially aligned arms 22 which extend perpendicularly outwardly from a vertical center main shaft 24 (FIG.
2).
The main shaft and arms form a housing, which is supported by a frame 60.
The centrifuge is driven by an external motor to rotate about a longitudinal or vertical axis 27 of the center main shaft which develops the centrifugal forces necessary for operation.
The centrifuge preferably operates in the range of 600-2000 rpm, depending on its overall size.
Each arm 22 is identically constructed, and comprises a plurality of concentrically spaced tubes 28 (FIGS.
2, 3, 4, 8 and 13) with the tubes having alternating longer and shorter lengths.
The alternating longer and shorter lengths make the distal ends 30 of each of the tubes alternatingly off-set.
The center tube 32 is the smallest in diameter, and contains a conveyor screw 34 for removing the solids that build up at the distal end 36 of the arm during use.
The conveyor screw moves the solids or heavier materials through the center tube 32 towards the center main shaft 24, where the solids are then moved down the center main shaft by another conveyor screw 38, for removal therefrom or deposit into a receptacle (not shown).
Still generally, the sludge enters the arms 22 from above through the center main shaft 24 while the centrifuge is rotating.
The sludge immediately moves toward the distal ends 36 of each of the arms.
The solids or heavier materials are removed from the liquid medium as the centrifuge is operated, as will be explained below.
As the sludge is forced to the distal ends 30 by the rotation of the arm about the center main shaft 24, the solid or heavier material 40 in the sludge compacts to form a plug 42 at the distal end (see FIG.
8), and the liquids 44 are forced to flow back toward the center main shaft
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