JP7406702B2 - solid liquid separator - Google Patents

Description

The present invention relates to a solid-liquid separator that dewaters sludge such as water/sewage sludge and factory wastewater, and in particular, it generates a volume change in a filtration chamber by revolving a spiral rotating ring, and continuously removes sludge from the sludge. This invention relates to a solid-liquid separator that separates solid-liquid.

Conventionally, a filtration chamber is formed by a disc-shaped filtration plate and an outer ring of the filtration chamber, and a rotatable impeller is installed in this filtration chamber, and the undiluted solution press-ined from the center of the filtration chamber is circulated by the impeller. , a continuous process in which the frictional resistance generated between the filter plate and the stock solution and the shear frictional resistance force between the cake stacked on the filtration surface and the stock solution are dehydrated, and the cake is removed from the outlet of the outer ring of the filter chamber. A pressure dehydrator is disclosed in Patent Document 1.

In addition, a spiral rotary plate is horizontally rotatably arranged on the bottom plate that holds the raw water, and this spiral rotary plate is rotated by a drive machine to transport the sludge in the raw water to the center or the outer periphery. A liquid separation device is disclosed in Patent Document 2.

Patent No. 4370772 Patent No. 5478842

The dehydrator described in Patent Document 1 performs solid-liquid separation while supplying a stock solution from the center of a disk and transporting it to a discharge port provided at an outer peripheral end. Therefore, as the supplied stock solution approaches the outer peripheral end, the concentration of the stock solution progresses and the volume decreases, but the volume of the filtration chamber increases as the stock solution approaches the outer peripheral end. It is necessary to increase the supply amount in order to match the volume of the stock solution with the volume of the filtration chamber, but sufficient dehydration cannot be achieved because the distance from the center to the outer edge is short and the transport path for the stock solution is simple and short. there is a possibility.

The solid-liquid separator described in Patent Document 2 separates raw water into solid-liquid by gravity concentration, and the spiral rotating plate acts to transport solids (sludge) deposited on the bottom plate by gravity concentration. are doing. Since the spiral rotating plate itself rotates 360 degrees, the volume of the channel changes, but basically only gravity acts on the raw water, so the water content of the separated sludge is high. Furthermore, since the heavy object (the spiral rotary plate) is rotated, the initial torque is large, and a large-sized drive machine is required.

The present invention is a solid-liquid solution that continuously conveys solids to the discharge port by applying pressure to the stock solution through the volume change caused by the revolution of a spiral rotating ring, and discharging the liquid from the filtration surfaces provided on both sides. Provide separator.

In the present invention, a filtration chamber is formed by a disc-shaped filtration plate having a pair of filtration surfaces and an annular outer ring of the filter chamber, and a supply pipe provided on a tangent to the outer ring of the filter chamber is connected to a supply port connected to the outer ring of the filter chamber. In a solid-liquid separator, a raw solution is supplied along the inner wall of the filter plate, and the cake is discharged from a discharge port in the center while separating the solid and liquid with a filter plate. A fixed ring formed in a spiral shape, a rotating ring formed at the same pitch as the fixed ring in the spiral flow path formed by the fixed ring, and the rotating ring rotated with a predetermined distance eccentric from the center of the fixed ring. The rotary ring rotates within the spiral flow path formed by the fixed ring, thereby making it possible to continuously change the volume and carry out conveyance at the same time.

The drive ring is rotatably inserted into the housing, the drive shaft is inserted into the center of the drive ring, and the connecting shaft is rotatably inserted into a predetermined position away from the center to connect to the rotating ring, and the drive shaft is inserted into the inner wall of the housing. A control groove is formed in an annular shape eccentric to the shaft center, the end of the connecting shaft is engaged with the control pin, and the pin part provided on the control pin is loosely fitted into the control groove to fix the spiral rotating ring. It revolves around the center of the ring.

When a scraper is engaged with both ends of the rotating ring facing each of the pair of filtration surfaces of the filtration plate , the scraper slides on the filtration plate, thereby preventing backflow of the stock solution in the flow path and preventing filtration. Prevent clogging of the board.

If at least one of the pair of filter plates is tapered so that the internal volume decreases from the outer periphery toward the center, the volume of the stock solution in the channel decreases as it moves toward the outlet, allowing efficient solid-liquid separation. becomes.

According to the present invention, the rotating ring eccentrically rotates within the spiral flow path formed by the fixed ring, so that volume change and conveyance can be performed simultaneously. In addition, the screens provided on both sides allow for a large filtration area, allowing continuous large-capacity treatment. Furthermore, if a scraper is provided on the rotating ring, the dehydrated cake can be transported without overflowing the spiral flow path, and the filter plate can be prevented from clogging and regenerated.

1 is a longitudinal sectional view of a solid-liquid separator according to the present invention. Similarly, it is a cross-sectional view of the solid-liquid separator. FIG. 2 is an enlarged view of the drive ring shown in FIG. 1; FIG. 4 is a sectional view taken along the line AA shown in FIG. 3; FIG. 2 is a side view and a front view of a connecting shaft of a solid-liquid separator according to the present invention. Similarly, it is a side view and a front view of a control pin. Similarly, it is a partial sectional view of the rotating ring. It is a trajectory of a connecting shaft and a pin portion as the drive ring according to the present invention rotates. FIG. 2 is a cross-sectional view showing the state of the flow path in the solid-liquid separator according to the present invention when (a) the rotating ring is at 0° and (b) at 90°. Similarly, (c) is a cross-sectional view showing the state of the flow path in a state where the rotating ring is at 180° and (d) at 270°. Similarly, (e) is a cross-sectional view showing the state of the flow path in a state where the rotating ring is at 360°.

1 and 2 are a longitudinal sectional view and a transverse sectional view of a solid-liquid separator according to the present invention.
An annular filtration chamber outer ring 2 is connected to a pair of disc-shaped filtration plates 1 and 1 on which metal filter media are stretched, and an annular filtration chamber outer ring 2 is connected to the outer peripheral edge of the pair. 5 is formed.

A supply pipe 3 is tangentially connected to the outer ring 2 of the filtration chamber to a supply port 4 of the outer ring, and supplies the stock solution into the filtration chamber 5 along the inner wall of the outer ring 2 of the filtration chamber.

In the filtration chamber 5, a fixed ring 6 spirally formed with the same width from the supply port 4 toward the center is provided between the opposing filtration plates 1, 1. A spiral flow path is formed from the supply port 4 toward the center, and a discharge port 7 is opened near the center of one of the filter plates 1.
A cake discharge pipe 8 is connected to the discharge port 7, and the solid matter (cake) of the stock solution separated into solid and liquid in the filtration chamber 5 is discharged to the outside.
The filter plate 1 and the outer ring 2 of the filter chamber are surrounded by a casing 9, and the solid-liquid separated liquid that passes through the filter plate 1 is discharged to the outside from a filtrate discharge pipe 10 provided below.

In the flow path formed by the fixed ring 6 of the filtration chamber 5, a rotating ring 11 formed in the same shape as the fixed ring 6 is swingably disposed. The rotating ring 11 is formed in a spiral shape with the same pitch as the fixed ring 6, and the starting end of the rotating ring 11 is located near the supply port 4, and the ending end is located near the center of the filter plate 1.

The vicinity of the center of the other filter plate 1 facing the discharge port 7 of one filter plate 1 is connected to a housing 12, and a drive ring 13 is rotatably installed inside the housing 12. A drive machine 14 is attached to the outside of the housing 12, and a drive shaft 15 is inserted through the center of the drive ring 13 to rotate the drive ring 13.

A connecting shaft 16 is rotatably inserted through a predetermined position apart from the center of the drive ring 13, and the other end of the connecting shaft 16 is connected to the rotating ring 11.

3 is an enlarged view of the drive ring shown in FIG. 1, and FIG. 4 is a sectional view taken along line AA shown in FIG. 3.
The drive ring 13 is formed into a substantially cylindrical shape, and the drive shaft 15 is inserted into the drive shaft hole 17 provided at the center, and rotated by the drive mechanism 14 while sliding on the inner wall of the housing 12 . The drive shaft hole 17 is set to be concentric with the center of the fixed ring 6.

A known seal member 18, such as an O-ring, is provided on the outer periphery of the drive ring 13.
A connecting shaft 16 is rotatably inserted into a predetermined position apart from the center of the drive ring 13. When the drive ring 13 is rotated, the connection shaft 16 revolves around the drive shaft 15 while being separated by a predetermined distance. The connecting shaft 16 is connected to the rotating ring 11, and rotates the rotating ring 11 within the flow path formed by the fixed ring 6 in accordance with the rotation of the drive ring 13.

The end of the connecting shaft 16 engages a control pin 19 . An annular control groove 21 is formed in the inner wall of the housing 12 facing the back surface of the drive ring 13 in a state eccentric to the center of the drive shaft 15. It is fitted. A cover 23 for holding down the control pin 19 is provided at the end of the connecting shaft 16, and is fixed using a known method such as bolts.
In addition, in order to easily slide the connecting shaft 16, a sliding bearing or the like may be provided in the connecting shaft hole 20 to reduce frictional resistance.

FIG. 5 is a side view and a front view of the connecting shaft.
One end of the connecting shaft 16 is formed into a convex portion 24 which is partially cut into a straight line. The linear portion of the convex portion 24 is engaged with the control pin 19, and the posture of the connecting shaft 16 is controlled according to the pin portion 22 positioned by the control groove 21.
The other side of the connecting shaft 16 is connected to the rotating ring 11 by providing a power transmission means. In this embodiment, power is transmitted using a key.

In this embodiment, the control pin 19 is held down by a cover 23 to prevent it from coming off, and a screw hole 25 for fixing the cover 23 is formed at the end on the protrusion 24 side.

FIG. 6 is a side view and a front view of the control pin.
The control pin 19 is composed of a plate portion 26 and a pin portion 22, and the pin portion 22 is provided protruding from one side near the end of the plate portion 26 formed in a substantially oval shape. The pin portion 22 loosely fits into the control groove 21 of the housing 12.

The plate portion 26 has an opening 27 and engages with the convex portion 24 of the connecting shaft 16. The attitude of the control pin 19 is controlled by the pin portion 22 that loosely fits into the control groove 21, and the rotation of the connecting shaft 16 is restricted by the engagement between the opening 27 and the convex portion 24.

FIG. 7 is a partial cross-sectional view of the rotating ring.
Both ends of the rotary ring 11 that rotates between the opposing filter plates 1, 1 have gaps with the respective filter plates 1, and scrapers 28 are engaged with the side ends to fill the gaps. There is. The scraper 28 is made of flexible synthetic resin, etc., and one side of the scraper 28 is fixed to the rotating ring 11, and the other side slides on the filter plate 1 to prevent backflow of the raw solution in the channel. At the same time, clogging of the filter plate 1 is prevented.

In this embodiment, one side of the scraper 28 is fixed by being inserted into the plate width of the rotary ring 11, but it may be fixed by known means along the curved surface facing the flow path.

FIG. 8 shows the trajectory of the connecting shaft and pin portion as the drive ring rotates.
The drive ring 13 rotates around the drive shaft 15. A connecting shaft 16 inserted through the drive ring 13 also rotates around the drive shaft 15.

The pin portion 22 of the control pin 19 that engages with the connecting shaft 16 is loosely fitted into the control groove 21, and in this embodiment, the pin portion 22 is always maintained above the connecting shaft 16, and is kept at a predetermined position. Turn eccentrically by a distance of Specifically, it rotates around a point that is offset upward from the center of the drive shaft 15 by the distance from the center of the opening 27 of the control pin 19 to the pin portion 22 .

As a result, the rotating ring 11 connected to the connecting shaft 16 does not rotate, but performs a turning movement while being eccentric by a predetermined dimension, causing a change in volume within the flow path formed by the fixed ring 6.

FIG. 9(a) is a cross-sectional view showing the state of the flow path when the rotating ring is at 0°.
When the rotating ring is at 0°, the rotating ring 11 is located above the spiral flow path formed by the fixed ring 6, and is close to the filter chamber outer ring 2 or the fixed ring 6 above the rotating ring 11. The starting end of the rotating ring 11 is located near the filter chamber outer ring 2 of the supply port 4 , and the stock solution is supplied between the inner circumferential surface of the rotating ring 11 and the outer circumferential surface of the fixed ring 6.

The stock solution is continuously supplied by a supply device (not shown), separated into solid and liquid by the filter plate 1, and transported along the inner peripheral surface of the rotating ring 11 through a spiral flow path toward the center. The water in the stock solution that has passed through the pair of filter plates 1, 1 falls downward inside the casing 9 and is discharged from the filtrate discharge pipe 10.

The volume is reduced on the left side of the spiral flow path, and is compressed by the supply of the raw solution from the supply port 4, so that solid-liquid separation progresses.

FIG. 9(b) is a cross-sectional view showing the flow path when the rotating ring is at 90 degrees.
When the rotating ring 11 is at 90°, the rotating ring 11 is located on the left side of the spiral flow path formed by the fixed ring 6, and is adjacent to the filter chamber outer ring 2 or the fixed ring 6 on the left side of the rotating ring 11. There is. The starting end of the rotating ring 11 is located near the center of the supply port 4, and the stock solution is supplied along the inner and outer circumferential surfaces of the rotating ring 11.

In the flow path on the inner circumferential surface of the rotating ring 11, the stock solution is conveyed to the left by reducing the volume above the spiral flow path, expanding the volume on the left side of the flow path, and supplying the stock solution from the supply port 4. At the bottom of the spiral flow path, the volume is reduced, and the raw liquid is compressed and solid-liquid separation progresses.

FIG. 10(c) is a cross-sectional view showing the flow path when the rotating ring is at 180°.
When the rotating ring 11 is at 180°, the rotating ring 11 is located below the spiral flow path formed by the fixed ring 6, and is close to the filter chamber outer ring 2 or the fixed ring 6 below the rotating ring 11. The starting end of the rotating ring 11 is located near the fixed ring 6 of the supply port 4 , and the stock solution is supplied between the outer peripheral surface of the rotating ring 11 and the filter chamber outer ring 2.

In the flow path on the inner circumferential surface of the rotating ring 11, the stock solution is transported downward by volume reduction on the left side of the spiral flow path and volume expansion at the bottom of the flow path. On the right side of the spiral flow path, the volume is reduced, and the raw liquid in the flow path is compressed and solid-liquid separation progresses.

At this time, the stock solution is supplied between the outer circumferential surface of the rotating ring 11 and the outer ring 2 of the filter chamber, but due to the volume reduction on the left side of the flow path and the supply of the stock solution from the supply port 4, the stock solution is compressed and the outer circumferential surface of the rotating ring 11 is However, solid-liquid separation progresses.

FIG. 10(d) is a cross-sectional view showing the flow path when the rotating ring is at 270 degrees.
When the rotating ring 11 is at 270°, the rotating ring 11 is located on the right side of the spiral flow path formed by the fixed ring 6, and is close to the filter chamber outer ring 2 or the fixed ring 6 on the right side of the rotating ring 11. There is. The starting end of the rotating ring 11 is located near the center of the supply port 4, and the stock solution is supplied along the inner and outer circumferential surfaces of the rotating ring 11.

In the flow path on the inner circumferential surface of the rotating ring 11, the undiluted solution is transported to the right by volume reduction at the bottom of the spiral flow path and volume expansion at the right side of the flow path. The volume is reduced in the upper part of the spiral flow, and the raw liquid is compressed and solid-liquid separation progresses.

In the flow path on the outer circumferential surface of the rotating ring 11, the undiluted solution is transported to the left by reducing the volume above the spiral flow path and expanding the volume on the left side of the flow path. Solid-liquid separation progresses as the volume of the lower part of the flow path is reduced and the liquid is compressed by supplying the raw solution from the supply port 4.

FIG. 11(e) is a cross-sectional view showing the flow path in a state where the rotating ring is at 360 degrees.
This is the same position as when the rotating ring 11 is at 0°, and the starting end of the rotating ring 11 is located near the filter chamber outer ring 2 of the supply port 4.

In the flow path on the inner circumferential surface of the rotating ring 11, the undiluted solution is transported upward by the volume reduction on the right side of the spiral flow path and the volume expansion above the flow path. The volume decreases on the left side of the spiral flow path, and is compressed by the supply of the raw solution from the supply port 4, and solid-liquid separation progresses.

In the flow path on the outer circumferential surface of the rotating ring 11, the stock solution is transported downward by volume reduction on the left side of the spiral flow path and volume expansion at the bottom of the flow path. Solid-liquid separation progresses as the volume on the right side of the flow path is reduced and the liquid is compressed by supplying the raw solution from the supply port 4.

The dehydrated cake transported to the center is discharged to the outside through a cake discharge pipe 8 from a discharge port 7 opened in one of the filter plates 1.

The eccentric rotation of the rotary ring 11 has a kneading effect on the solid-liquid separated dehydrated cake in the channel, drains the moisture staying inside to the external surface, and improves the solid-liquid separation effect. Since the rotating ring 11 is provided with a scraper 28, it is possible to convey the dehydrated cake deposited on the surface of the filter plate 1, and also to prevent clogging and regenerate the filter plate 1.

The pair of filter plates 1, 1 may be tapered so that the internal volume decreases from the outer periphery toward the center. At this time, by forming at least one of the filter plates 1 into a tapered shape, the volume can be reduced.

The solid-liquid separator according to the present invention forms a flow path by combining a spiral fixed ring and a rotating ring, and performs solid-liquid separation operation continuously. This enables stable solid-liquid separation even with organic sludge. Therefore, the continuous solid-liquid separator is suitable for treatment plants that require large-capacity treatment of water, sewage sludge, industrial wastewater, and the like.

1 Filtration plate 2 Filter chamber outer ring 4 Supply port 5 Filtration chamber 6 Fixed ring 7 Discharge port 11 Rotating ring 12 Housing 13 Drive ring 15 Drive shaft 16 Connection shaft 19 Control pin 21 Control groove 22 Pin part 28 Scraper

Claims (4)

A filtration chamber (5) is formed by a disc-shaped filtration plate (1, 1) having a pair of filtration surfaces and an annular filtration chamber outer ring (2), and a supply pipe provided on a tangent to the filtration chamber outer ring (2). (3) is connected to the supply port (4) along the inner wall of the filter outdoor ring (2) , and the undiluted solution is supplied along the inner wall of the filter outdoor ring (2), solid-liquid is separated by the filter plate (1), and the discharge port (7) provided in the center is supplied. In the solid-liquid separator that discharges the cake from
A fixed ring (6) formed in a spiral shape from the supply port (4) toward the center between the pair of filter plates (1, 1);
a rotating ring (11) formed at the same pitch as the fixed ring (6) in a spiral flow path formed by the fixed ring (6);
A solid-liquid separator comprising: a drive ring (13) that rotates a rotating ring (11) eccentrically by a predetermined distance from the center of a fixed ring (6). rotatably inserting the drive ring (13) into the housing (12);
Insert the drive shaft (15) into the center of the drive ring (13),
A connecting shaft (16) is rotatably inserted into a predetermined position away from the center and connected to the rotating ring (11),
A control groove (21) is formed in an annular shape on the inner wall of the housing (12) in a state eccentric to the center of the drive shaft (15),
engaging the end of the connecting shaft (16) with the control pin (19);
The solid-liquid separator according to claim 1, characterized in that a pin portion (22) provided on the control pin (19) is loosely fitted into the control groove (21). 3. The rotary ring (11) has scrapers (28) engaged with both end portions thereof facing each of the pair of filter surfaces of the filter plates (1, 1). Solid-liquid separator. 4. The filter according to claim 1, wherein at least one of the pair of filter plates (1, 1) is tapered so that the internal volume decreases from the outer periphery toward the center. Solid-liquid separator.

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