JPS6246448Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a centrifugal concentrator that separates fine particles contained in a suspension.

Conventionally, a decanter-type centrifugal concentrator has a screw for transferring concentrated liquid in an outer cylinder, and the direction in which the suspension flows inside the screw and the direction in which separated solids are carried by the screw are determined. Because of the opposite conditions, turbulence occurs and fine particles are not centrifuged, and even if they are separated, they are suspended in the liquid again.To prevent this, extremely high centrifugation is required. It required strength and a very long body. This idea prevents turbulence inside the concentrator, and
This is a device that can efficiently obtain concentrated liquid at low speed.

Below, we will explain this idea in detail based on the drawings.
As shown in the figure, its configuration is such that two cases having conical parts 1a and 1b are joined together to form an outer cylinder 1.
In a horizontal centrifugal concentrator in which an inner cylinder 2 that rotates at a slight speed difference with the outer cylinder 1 is disposed inside the outer cylinder 1, the inner cylinder 2 is configured in a conical shape, and the inner cylinder 2 is suspended inside the inner cylinder 2. The supply pipe 11 for the turbid liquid is opened, and a through hole 8 is provided at the bottom of the inner cylinder 2 at a portion corresponding to the water level when the inner cylinder 2 is rotated, and a through hole 8 is provided at the stop for the outflow of settled sludge. A partition wall 3 having a passage 7 is provided, and inside the inner cylinder 2 there is a partition plate 5 whose end edge on the rotation axis side reaches the through hole 8 along the direction of the rotation axis of the inner cylinder 2. Further, an edge on the rotation axis side of the partition plate 5 is provided inside the conical part 1b on the other side of the joined outer cylinder 1 along the rotation axis direction. Partition plates 6 that substantially coincide with the edges are provided, and further, the inner diameter edges of the longitudinally intermediate portions of these partition plates 6 substantially coincide with the edges of the partition plates 6 on the rotation axis side, and the outer diameter edges thereof They are connected by a ring-shaped partition plate 10 that extends halfway into the liquid level. The partition plates 5 and 6 form independent suspension separation chambers radial to the rotation axis.

Incidentally, reference numeral 4 is a screw fixed to the circumferential portion of the inner cylinder 2, and is provided so as to be in contact with the conical portion 1a of the outer cylinder. A step-tapered protrusion 9 is provided on the outer cylinder 1 so as to face the starting end of the screw 4. In addition, the code|symbol 12 shows the discharge port of a thickened sludge, and 13 shows the discharge port of a separated liquid.

Next, the operation of this invention will be explained. Since this device is constructed as described above, the suspension supplied from the suspension supply pipe 11 to the inner cylinder 2 is fine particles with good sedimentation properties due to the centrifugal force caused by the rotation of the conical parts 1a and 1b. It is sedimented and concentrated, slides on the inner surface of the conical inner cylinder 2, passes through the passage 7 to the bottom of the large-diameter conical parts 1a and 1b, and passes through the tapered protrusion 9 of the outer cylinder.
to fall. At the same time, the liquid containing the remaining solid particles passes through the through hole 8 and flows into the conical portion 1b of the outer cylinder. Then, centrifugal force is applied for a longer residence time than inside the inner cylinder 2, and the solid particles are centrifugally sedimented.
The thickened sludge that has slipped down the inner wall of the conical portion 1b of the outer cylinder is also fed into the tapered protrusion 9. The thickened sludge stored in the protrusion 9 of this outer cylinder is transferred to the screw and discharged from the discharge port 12. On the other hand, the separated liquid separated by centrifugal force overflows from the discharge port 13, but in the device of this invention, partition plates 5 and 6 are provided in the radial direction with respect to the rotating shaft, and the inner cylinder 2 and Since an independent suspension separation chamber is formed in the conical part 1b of the outer cylinder, there is no slippage of the thickened sludge, and the separated liquid flows along the axial end edge of the partition plate 5, thereby preventing the liquid from passing through. It passes through the hole 8, then flows along the axial end edge of the partition plate 6, and is sent to the discharge port 13 in a layered form (hollow water tube shape), where it can be remixed with the thickened sludge. It's something that doesn't exist. Furthermore, the partition plate 10 prevents comparatively heavy suspended matter contained in the separated liquid from being discharged. That is, the heavy suspension in the separation liquid is
By hitting this partition plate 10, it is accelerated in the radial direction, and is sent to the protruding part 9 by sliding on the slope of the conical part 1b. Further, the concentrated sludge separated by centrifugal force and stored in the protrusion 9 of the outer cylinder is transferred by the screw 4 through a narrow passage separated from the separation chamber by the inner cylinder 2 and the conical part 1a of the outer cylinder. Therefore, even if there is no remixing with the separated liquid and there is a difference in rotational speed between the outer cylinder 1 and the inner cylinder 2, the screw is provided in the narrow passage, so that the concentrated liquid stored in the protrusion 9 of the outer cylinder can be It does not disturb the sludge and does not cause turbulence in the separation chamber.

As detailed above, the suspension concentration device according to this invention does not cause turbulent flow of the suspension, does not require remixing of separated sludge and separated liquid, can be configured compactly, and operates at low speed. A good separation effect can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of the horizontal centrifugal concentrator according to this invention, FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1, and FIG. 3 is a cross-sectional view taken along line A-A in FIG. The main part of the cross-sectional view along the line is shown. Explanation of symbols, 1... Outer cylinder, 1a, 1b... Conical part of outer cylinder, 2... Inner cylinder, 3... Partition wall, 4... Screw, 5... Partition plate, 6... Partition plate, 7... ... Passageway, 8 ... Through hole, 10 ... Partition plate, 11 ... Suspension liquid supply pipe.

Claims (1)

[Scope of utility model registration request] Two cases having conical parts 1a and 1b are joined together to form an outer cylinder 1, and the outer cylinder 1 is placed inside the outer cylinder 1.
In a horizontal centrifugal concentrator equipped with an inner cylinder 2 that rotates at a slight speed difference, the inner cylinder 2 has a conical shape, and a suspension supply pipe 11 is opened inside the inner cylinder 2, and The bottom of the inner cylinder 2 is provided with a through hole 8 at a portion corresponding to the water level when the inner cylinder 2 is rotated, and a partition wall 3 having a passage 7 for outflow of settled sludge at the fixed part. Inside the inner cylinder 2, a partition plate 5 is provided along the direction of the rotation axis of the inner cylinder 2, the end edge of which is on the rotation axis side reaches the portion of the through hole 8,
Further, inside the conical part 1b on the other side of the joined outer cylinders 1, along the rotation axis direction,
A partition plate 6 is provided whose edge on the rotation axis side substantially coincides with an edge on the rotation axis side of the partition plate 5, and further, the inner diameter edge of the partition plate 6 is connected to the intermediate portion in the longitudinal direction of the partition plate 6. 6. A horizontal centrifugal concentrator characterized in that the horizontal centrifugal concentrator is connected by a ring-shaped partition plate 10 that substantially coincides with the edge on the side of the rotation axis of the device 6 and whose outer diameter edge extends halfway into the liquid level.