JP3925715B2 - Cleaning device for continuous pressure dehydrator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
This invention is a continuous pressure dehydrator that presses a raw solution such as industrial wastewater sludge, sewage sludge, etc. into an annular filtration chamber, discharges the filtrate from a filter plate while concentrating the impeller and raw solution, and concentrates and dehydrates Specifically, the present invention relates to an improvement of a cleaning device for a continuous pressure dehydrator.
[0002]
[Prior art]
Conventionally, a filter chamber is formed by a disk-shaped filter plate and a filter chamber outer ring, and a rotatable impeller is arranged in the filter chamber, and the stock solution press-fitted from the center of the filter chamber is fed by the impeller. A continuous pressure dehydrator that generates a shear friction resistance between the cake laminated on the filtration surface and the undiluted solution, dehydrates, and scrapes the cake on the filtration surface with an impeller and takes out the cake from the outlet of the outer ring of the filtration chamber Is proposed by the applicant of the present invention in Patent Document 1. Also, Patent Document 1 proposes a cleaning device in which a cleaning nozzle connected to the filter plate is connected to a rotatable cleaning water pipe and the cleaning nozzle is swung on the outer peripheral surface of the filter plate. is doing.
[0003]
[Patent Document 1]
WO00 / 16970, (Detailed description of invention, lines 6 to 2 from the bottom of page 4, Fig. 19)
[0004]
[Problems to be solved by the invention]
Conventional continuous pressure dehydrators can perform large-capacity processing if a large number of filtration chambers are arranged in parallel, do not require a large installation space, and do not require consumables such as filter cloth. The conventional device that cleans the filtration surface of the filtration plate while rotating the washing water pipe can regenerate the filtration plate while performing filtration dewatering. However, the washing nozzle is reciprocated on the outer peripheral surface of the filtration plate. However, it is difficult to clean the filter plate below the drive shaft because the filtration surface of the filter plate differs from the circulation trajectory of the cleaning nozzle. The present invention provides a continuous pressure dehydrator that approximates the filtration surface of the filter plate and the circulation trajectory of the washing tube, and can wash the entire filtration surface and enables continuous operation.
[0005]
[Means for Solving the Problems]
The gist of the present invention is that a filtration chamber is formed by a pair of disk-shaped filtration plates having a filtration surface and an annular filter chamber outer ring. In a pressure dehydrator that supplies stock solution from the peripheral end and removes the cake from the outer peripheral end of the filtration chamber, a rotating ring and a driven rotating ring are rotatably arranged before and after the filtration plate, and are fixed to the rotating ring and the driven rotating ring. The plurality of nozzle tubes are arranged on the filtration surface of the filter plate, and the other end of the nozzle tube is connected to a washing water tube disposed along the outer peripheral surface of the filter chamber outer ring so that the nozzle tubes before and after the filter plate are connected. The washing nozzle rotates along the filtration surface of the filter plate, and the entire filtration surface of the filter plate can be washed.
[0006]
The rotating means of the cleaning device supports the rotating ring and the driven rotating ring rotatably on the filter plate spacers connected to the front and rear of the filter plate, and the cleaning drive is arranged on the frame connecting the rear filter plate spacer. The washing drive is linked to the rotating ring, and the power transmitted to the rotating ring can be rotated around the driven rotating ring to revolve the nozzle tube in the shape of a concentric shaft with the drive shaft. The bearings of the rotating ring and the driven rotating ring do not need to be loaded, so that they can be made of a lubricious resin material and do not require replenishment of grease or lubricating oil. A proximity switch is arranged on the frame, a pair of detection plates are fixed to the periphery of the rotation ring, and a proximity switch is provided on the rotation locus of the detection plate. Washing water sprayed from each nozzle tube is sprayed on a predetermined range of the filter plate while reversing forward and reverse, and the entire filtration surface of the filter plate can be regenerated.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The apparatus according to the present invention is configured as described above, and when the impeller is rotated while the stock solution is pressed into the filtration chamber, the frictional resistance generated between the filter plate and the stock solution and the cake laminated on the filtration surface A shear friction resistance force is generated between the solution and the stock solution for dehydration, and a cake layer is gradually formed on the filtration surface of the filter plate. The impeller blades rotate while sliding against the filtration surface of the filter plate, scraping a thin cake layer that is clogged, and regenerating the filtration surface of the filter plate while conveying the cake. The cake scraped off by the impeller is sent to the outer periphery of the filtration chamber. Eventually, the cake from which the filtrate has been separated loses its fluidity, and the cake that rotates with the impeller is gradually discharged from the filtration chamber. .
[0008]
When the filter plate is clogged and the filterability deteriorates, the cleaning drive is driven to rotate the rotating ring, and the driven rotating ring connected by the nozzle pipe and the cleaning water pipe is also rotated. The washing water pipe connected to the nozzle pipe rotates along the outer ring of the filtration chamber, and the nozzle pipe swings while revolving a predetermined angle along the filtration surface of the filtration plate. The washing water ejected from the nozzle tube backwashes from the outside of the filtration chamber to regenerate the filtration surface of the filter plate. At the end of the filtration operation, the filter cake adhering to the filter plate is washed away with washing water sprayed from the nozzle tube, and the pressure dehydrator is stopped. While performing the dehydration operation, the filter plate can be arbitrarily washed, and is particularly effective for a stock solution having a fast clogging property.
[0009]
【Example】
The continuous pressure dehydrator according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view of the pressure dehydrator, and the pressure dehydrator 1 is a pair of disk-shaped members each having a metal filter medium stretched thereon. An annular filter chamber outer ring 3 is connected to the filter plates 2 and 2 at the outer peripheral end, and an inner ring support tube 4 is connected to the inner peripheral end, and an annular filter chamber 5 is interposed between the pair of filter plates 2 and 2. Is formed. Filter plate spacers 6 and 7 are connected before and after the inner ring support cylinder 4, and a liquid supply chamber 8 is formed inside the inner ring support cylinder 4. The stock solution supply pipe 9 is supported by the front filter plate spacer 6 and is open to the liquid supply chamber 8. The stock solution supplied from the supply pipe 9 is press-fitted into the liquid supply chamber 8, and the circumferential direction extends from the liquid supply chamber 8. Into the filtration chamber 5. The stock solution press-fitted into the filtration chamber 5 separates the filtrate from the filtration surface of the filtration plate 2 and forms a cake layer on the filtration surface of the filtration plate 2.
[0010]
As shown in FIG. 1, the pressure dehydrator 1 is supported by connecting a mounting seat 10 of a rear filter plate spacer 7 to a frame 11. A drive shaft 13 pivotally supported on the bearing 12 of the filter plate spacer 7 on the frame 11 side extends to the liquid supply chamber 8, and the base end portion of the impeller 14 disposed in the filtration chamber 5 is fixed. is there. The rear end of the drive shaft 13 is linked to an impeller drive machine 15 supported on the frame 11. Reference numeral 16 denotes a filter medium frame that reinforces the filtration surface of the filtration plate 2. FIG. 2 is a longitudinal sectional view of the filtration chamber 5 of the pressure dehydrator 1 in which the side edge and tip of the impeller 14 are brought close to the filtration plate 2 and the filter chamber outer ring 3. In the embodiment of the present invention, the blade 14a of the impeller 14 is an impeller 14 that is bent backward by four straight pieces to approximate a curved line and moved backward in the rotational direction. The impeller driving machine 15 shown in FIG. 1 is driven, the blade 14a of the impeller 14 is brought into sliding contact with the filtration surface of the filter plate 2, the thin cake layer formed on the filtration surface is scraped, and the cake is conveyed. Then, the filtration surface of the filter plate 2 is regenerated.
[0011]
As shown in FIG. 2, a cake discharge port 17 is provided on the peripheral surface of the filter chamber outer ring 3 of the filtration chamber 5, and a flap valve 19 that is opened and closed by an air cylinder 18 is disposed at the cake discharge port 17. The opening degree of the cake discharge port 17 is adjusted by the flap valve 19 to generate a pressure applied to the stock solution in the filtration chamber 5. The cake scraped off by the blade 14 a of the impeller 14 is sent to the outer periphery of the filtration chamber 5. The blades 14a in the vicinity of the filter outer ring 3 where the moisture content of the cake decreases increases the rotational wedge action force and the force to move the cake in the radial direction, thereby giving a large shearing force to the cake and further dewatering. The cake rotating together with the impeller 14 is discharged from the cake discharge port 17 of the filtration chamber 5.
[0012]
FIG. 3 shows a pressure dehydrator 1 provided with a cleaning device, in which a cleaning pipe 20 is provided along the outer ring 3 of the filtration chamber 5, and a nozzle pipe connected orthogonally to the cleaning pipe 20. 21 is provided on the filtration surface of the filter plate 2. FIG. 4 is a side view of the cleaning apparatus. In the embodiment of the present invention, two cleaning pipes 20, 20 arranged along the filter chamber outer ring 3 are formed in a tubular shape along the outer peripheral edge of the filter plate 2. Are connected to the circular tube portions 20a formed at both ends. Three nozzle tubes 21 branched from the circular tube portion 20 a of the cleaning tube 20 at equal intervals extend radially toward the axis of the drive shaft 13. As shown in FIGS. 1 and 3, a rotary ring 22 and a driven rotary ring 23 on the outer circumferential surface of the filter plate spacer 7 on the frame 11 side and a filter plate spacer 6 on the liquid supply pipe 9 side are connected to the axis of the drive shaft 13. They are arranged concentrically.
[0013]
FIG. 5 is a longitudinal sectional view of the rotary ring 22, and the rotary ring 22 is provided with an annular bearing 22 a slidably contacting the outer peripheral surface of the filter plate spacer 7 at the inner peripheral end thereof. The nozzle tube 21 is fixed to the disc portion 22b with a fixing bracket 24. FIG. 6 is a longitudinal sectional view of the driven rotary ring 23. Similarly to the rotary ring 22, the driven rotary ring 23 also has an annular bearing portion 23a slidably contacted with the outer peripheral surface of the filter plate spacer 6 at the inner peripheral end. The nozzle tube 21 is fixed to the disc portion 23 b of the driven rotary ring 23 with a fixing bracket 25. Since the bearings 22a and 23a of the rotating ring 22 and the driven rotating ring 23 are not loaded, a resin material having lubricity may be used, and it is not necessary to replenish grease or lubricating oil.
[0014]
FIG. 7 is a side view of the pressure dehydrator 1 provided with a cleaning device, and a flexible cleaning hose 26 is connected to the end of the nozzle tube 21 on the liquid supply tube 9 side. The other end of the frame is supported on the side plate 11a of the frame 11 and connected to a washing water source outside the machine. The cleaning water supplied from the cleaning hose 26 is supplied from the nozzle pipe 21 on the liquid supply pipe 9 side through the cleaning water pipe 20 to the nozzle pipe 21 on the frame 11 side. Washing water is jetted from the front and rear nozzle tubes 21, 21 onto the filter plate 2 and backwashed from the outside of the filtration chamber 5 to regenerate the filtration surface of the filter plate 2. In the embodiment of the present invention, one cleaning hose 26 is connected to the nozzle pipes 21, 21. However, the cleaning hose 26 may be connected to the cleaning water pipe 20, and the size of the pressure dehydrator 1 is not limited. Thus, the number of cleaning hoses 26 may be increased or decreased.
[0015]
FIG. 8 is a front view of the rotating ring 22 for rotating the cleaning device. A roller chain 27 is wound around an annular portion 22 c at the outer peripheral end of the rotating ring 22, and ends connected to both ends of the roller chain 27. Bolts 28 are fixed to a mounting seat 29 fixed to the rotary ring 22. As shown in FIG. 3, a cleaning drive 30 is arranged on a frame 11 that supports the filter plate spacer 7, and a roller chain 27 in which a drive sprocket 31 fitted to the cleaning drive 30 is wound around a rotary ring 22. Is meshed. The rotational force transmitted from the cleaning driving machine 30 to the rotary ring 22 causes the driven rotary ring 23 to rotate. The washing water pipe 20 is swung along the outer peripheral surface of the filter chamber outer ring 3 of the filtration chamber 5, and the nozzle pipe 21 is revolved in the shape of the concentric shaft of the drive shaft 13. During the dehydration operation, the vicinity of the filtration surface of the filter plate 2 can be arbitrarily rotated to clean the filter plate 2.
[0016]
FIG. 9 shows a device for detecting the rotation position of the nozzle tube, in which a proximity switch 33 is supported on a mounting seat 32 disposed on the frame 11, and a pair of detection plates 34, 34 are provided around the periphery of the rotating ring 22. It is fastened. The proximity switch 33 is provided along the rotation trajectory of the detection plate 34, and the position of the pair of detection plates 34, 34 is 90 ° with respect to the central axis of the filter plate 2. When the rotating ring 22 is rotated, the proximity switch 33 detects the rotating detection plate 34 and reverses the rotational drive of the cleaning drive machine 30. The rotation of the rotary ring 22 and the driven rotary ring 23 is reversed in the forward and reverse directions, and the three nozzle tubes 21 are swung along the filtration surface of the filter plate 2 at an angle of 90 °. The cleaning water sprayed from each nozzle tube 21 is sprayed on a predetermined range of the filtration surface of the filter plate 2, and the entire surface of the filter plate 2 can be cleaned with the sprayed cleaning water.
[0017]
【The invention's effect】
The continuous pressure dehydrator according to the present invention is configured as described above. The continuous trajectory of the nozzle tube is approximated to the filtration surface of the filter plate, the entire filtration surface can be washed, and continuous operation is possible. . In other words, the conventional apparatus for rotating the cleaning water pipe to clean the filtration surface of the filter plate, even when the cleaning nozzle is reciprocated on the filtration surface of the upper half of the filter plate, Since the circulation trajectories are different, it is difficult to clean the entire filter plate uniformly. In this invention, the rotary ring and the driven rotary ring are rotatably arranged before and after the filter plate forming the filtration chamber, and a plurality of nozzle tubes suspended on the rotary ring and the driven rotary ring are filtered by the filter plate. Since it can be swung freely along the surface, the nozzle tube moves along the filtration surface of the filter plate, and the entire filtration surface of the filter plate can be cleaned. And the filter plate which was arbitrarily clogged during the dehydration operation can be washed.
[0018]
Since the rotation means of the cleaning device is arranged so that the rotary ring and the driven rotary ring can rotate on the filter plate spacer before and after the filtration chamber is supported, and the cleaning drive unit supported on the frame is interlocked with the rotary ring, The rotational force transmitted to the rotating ring can rotate the driven rotating ring to revolve the nozzle tube in a concentric shaft shape with the drive shaft. Since no load is applied to the bearings of the rotating ring and the driven rotating ring, a lubricating resin material is sufficient and no grease or lubricating oil is required. And since the proximity switch is provided in the rotation trajectory of the pair of detection plates fixed to the rotating ring, the washing water sprayed from the respective nozzle pipes while the rotating ring and the driven rotating ring are rotated in the forward and reverse directions is filtered. The entire filtration surface of the filter plate can be regenerated by spraying on the filtration surface in a predetermined range.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an essential part of a pressure dehydrator according to the present invention.
FIG. 2 is a longitudinal sectional view of a pressure dehydrator.
FIG. 3 is also a partial longitudinal sectional view of a pressure dehydrator provided with a cleaning device.
FIG. 4 is a side view of the cleaning apparatus.
FIG. 5 is also a longitudinal sectional view of a rotating ring on which a nozzle tube is supported.
FIG. 6 is also a longitudinal sectional view of a driven rotary ring on which a nozzle tube is supported.
FIG. 7 is a side view of a pressure dehydrator similarly provided with a cleaning device.
FIG. 8 is also a front view of a rotating ring that rotates the cleaning device.
FIG. 9 is a side view of the detection device for the rotation position of the nozzle tube.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pressure dehydrator 2 Filter plate 3 Filter chamber outer ring 5 Filter chambers 6 and 7 Filter plate spacer 11 Frame 14 Impeller 20 Washing water pipe 21 Nozzle pipe 22 Rotating ring 23 Followed rotating ring 30 Washing drive machine 33 Proximity switch 34 Detection plate

Claims (3)

  A pair of disk-shaped filter plates (2, 2) having a filtration surface and an annular filter chamber outer ring (3) form a filter chamber (5), and a rotatable impeller (14) is provided in the filter chamber (5). ) In the pressure dehydrator (1) for supplying the stock solution from the inner peripheral end of the filtration chamber (5) and taking out the cake from the outer peripheral end of the filtration chamber (5). The rotary ring (22) and the driven rotary ring (23) are arranged in a freely rotating manner, and a plurality of nozzle tubes (21 ...) fixed to the rotary ring (22) and the driven rotary ring (23) are connected to the filter plate (2). The other end of the nozzle pipe (21) is connected to a washing water pipe (20) disposed along the outer peripheral surface of the filter chamber outer ring (3), and the front and rear of the filtration plate (2). A continuous pressure dehydrator cleaning device, characterized in that the nozzle tube (21) is swingable.   A rotary ring (22) and a driven rotary ring (23) are rotatably supported on the filter plate spacers (6, 7) connected to the front and rear of the filter plate (2), and the rear filter plate spacer (7) is connected. The continuous pressure dehydrator according to claim 1, wherein the washing drive (30) is disposed on the frame (11), and the washing drive (30) is linked to the rotating ring (22). Cleaning device. A proximity switch (33) is disposed on the frame (11), and a pair of detection plates (34, 34) are fastened to the periphery of the rotating ring (22) so that the detection plate (34) can follow the rotation trajectory. 3. The continuous pressure dehydrator cleaning device according to claim 2 , further comprising a proximity switch (33).

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