JP2796250B2 - Filtration device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filtration device for separating a solid from a liquid to be filtered, which is turbid.

[0002]

2. Description of the Related Art In general, washing water used in various washing machines is subjected to treatment such as filtration to prevent pollution of the environment and reduce the amount of water used. And reuse. For example, in a crate washing line, it is necessary to remove soil, dust and the like after use because the soil becomes turbid, and recently, the label is simultaneously removed by applying high pressure to the washing water and spraying it toward the crate. It is like
In such a case, the turbid solids may be caught by a pressure pump such as a plunger pump and cause a failure of the pressure pump. It is hoped that it will be done.

FIG. 6 is a schematic diagram for explaining a circulation path of washing water in a crate washing line 1. Washing water in a water storage tank 2 is pressurized by a high-pressure pump 3 and is converted into crate by a crate washing machine 4. The label is peeled off together with the removal of the soil and the like sprayed toward, and the resulting wastewater is temporarily stored in a drainage tank 5 and then sent to a screen device 7 by a transfer pump 6, where it is passed through a grid screen. As a result, the solid content is removed, the solid content is collected at a predetermined location, and the washing water is returned to the water storage tank 2 again.

[0004]

Conventionally, the above-described screen device 7 has a structure in which solids are removed by a grid-like screen. However, the size of the solids that can be removed here is as follows. While the size of the solid content allowed in the high-pressure pump 3 is considerably small, while the size of the solid content is considerably small, there is a possibility that the solid-liquid separation is insufficient conventionally and the high-pressure pump 3 is broken down. Was in

[0005] In order to accurately separate solids from turbid wastewater containing solids, filtration may be performed using a filter with a fine mesh (high mesh). However, if filtration is performed using a fine-grained filter, finer solids can be removed, but the frequency of clogging of the filter becomes high and continuous operation cannot be performed.

Conventionally, as a method of removing solids adhered to a filter surface, the solids are scraped off from the filter by a knife edge or a scraper. However, in a filter that treats wastewater generated from the above-described crate washing line having a label peeling function, the fiber yarn and the adhesive substance of the label become turbid and adhere to the filter, and this is scraped off with a knife edge or a scraper. Attempting to do so causes a problem that the fiber or adhesive substance is more tightly packed into the eyes of the filter, shortening the life of the filter and restricting continuous operation.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a filtration device which can efficiently treat a liquid to be treated containing fibers such as labels and adhesives, and has less clogging. Is what you do.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, a filtration device according to the present invention is characterized in that in a filtration device in which a solid-turbid liquid to be filtered is passed through a filtration sheet to perform solid-liquid separation, The filter sheet is attached to the upper surface of a liquid-permeable rotary plate that is rotated about an axis inclined at a predetermined angle with respect to the filter, and an inlet for charging the liquid to be filtered toward a portion of the filter sheet lower than the center of rotation. Is disposed, and a suction nozzle communicated with a vacuum suction device is disposed facing a portion of the filter sheet higher than a rotation center, and a suction port of the suction nozzle extends in a radial direction of the filter sheet. The suction port is formed in a slit shape, and the suction port and the filtration sheet are in contact with the upper surface of the filtration sheet at the rotation center side end and the outer periphery side end of the rotating net and the rear side in the rotation direction of the filtration sheet. When It is characterized in that a pressing member for holding the spacing is provided.

[0009]

In the filter of the present invention, a filter sheet suitable for the size of the solid to be removed is used. This filter sheet is used by being attached to the upper surface of a liquid-permeable rotating plate. The liquid-permeable rotating plate is rotated around an axis inclined at a predetermined angle with respect to the vertical line, so that solid matter is turbid. The liquid to be filtered is supplied to a portion of the filter sheet lower than the center of rotation. The liquid to be filtered put on the continuously rotating filter sheet passes through the filter sheet and the liquid-permeable rotary plate to remove solids.

[0010] The solid matter captured by the filter sheet is:
Due to the rotation of the filter sheet, the filter sheet is moved toward a position higher than the center of rotation. A suction nozzle is arranged at a position higher than the center of rotation of the filter sheet, and solids adhering to the upper surface of the filter sheet are sucked by the suction nozzle and removed from the filter sheet. This suction nozzle is provided with a slit-shaped suction port along the radial direction of the filter sheet, and at the end on the rotation center side, the end on the outer peripheral side, and the rear side of the suction port, on the upper surface of the filter sheet. Since the pressing member that comes into contact is provided, the filter sheet is suppressed from being lifted toward the suction port by the pressing member, and as a result, the suction port comes into contact with the upper surface of the filter sheet, or the suction port functions as a scraper. The solid content adhering to the upper surface of the filter sheet is effectively removed from the filter sheet by vacuum suction.

That is, in the filtration device of the present invention, solids are peeled off from the filtration sheet by vacuum pressure.
Since there is no action of scraping solids from the filter net, clogging of the filter sheet can be effectively prevented, and the filter sheet can be efficiently regenerated to a continuously usable state.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described based on an embodiment shown in the drawings. FIG. 1 is a schematic view showing an embodiment of the present invention, in which a further minute solid content is removed from circulating water while being supplied from a screen device 7 to a water storage tank 2. is there. In FIG.
0 indicates the entire filtration device, and this filtration device 10 is, for example, 1
A rotary filter 12 for rotating a filtration mesh 11 of 50 mesh (JIS 105μ) and a blower 1 as a solid removing means
And a sludge separator 15 for separating solids in a process from the suction nozzle 14 to the blower 13.

The rotary filter 12, which is a main component in this embodiment, performs filtration in about half the area by rotating the filter net 11 and filters solids in the other half area. It is configured to be separated from More specifically, the cylindrical frame 1
A punching metal 17 having a large number of fine holes is attached to the bottom of 6, and has a structure that allows liquid to pass through. The frame 16 is rotatably supported by attaching the center of the punching metal 17 to the lower end of the rotating shaft 18 with fixing means such as bolts and nuts.

The rotating shaft 18 is rotatably held by a bracket 19 provided above the water storage tank 2 at a predetermined angle (for example, 15 °) with respect to a vertical line, as shown in FIG. The upper end is connected to a drive motor 22 via a universal joint 20 and a connecting rod 21.
Therefore, the frame body 16 is also inclined at a predetermined angle with respect to the vertical line similarly to the rotating shaft 18, and the punching metal 17 is held so as to rotate while being inclined with respect to the horizontal plane. The filtration net 11 is attached to the upper surface of the punching metal 17. This attaching means can be configured so that, for example, the outer peripheral portion of the filter net 11 is pressed by a ring fitted into the frame 16 and the central portion is fixed to the rotating shaft 18 together with the punching metal 17.

The washing liquid drop 23 from the screen device 7 is disposed so as to face the lowest part of the filter net 11 inclined as described above. A suction nozzle 14 is provided to face the high place. The suction nozzle 14 has a slit-shaped suction port 24 extending in the radial direction of the filtration net 11, and the suction port 24 is provided between an end on the rotation center side of the filtration net 11 and an end on the outer periphery. Rollers 25 are attached to both. As shown in FIGS. 2 to 4, the roller 25 wraps the filtration net 11 on the inner and outer circumferences of the frame 16.
The suction roller 24 rolls by contacting the upper surface of the ring attached to the filter, so that the suction port 24 of the suction nozzle 14 is slightly raised from the upper surface of the filter net 11. Also, the back side of the suction port 24, that is, the filtration net 11
A scraper 26 that slides on the upper surface of the filtration net 11 is attached to substantially the entire width of the suction port 24 at the rear side in the rotation direction of the filter net 11. The roller 25 and the scraper 26 respectively attach the suction port 2 to the suction nozzle 14.
It is arranged so that the height projecting from 4 can be adjusted. The roller 25 and the scraper 26 constitute a pressing member, and the roller 25 and the scraper 26 press the filter net 11 against the suction force, and a predetermined distance is formed between the suction port 24 and the surface of the filter net 11. Is maintained at intervals. In addition, since the scraper 26 may be disposed behind the suction port 24 in the rotation direction of the filtration net 11, the scraper 26 may be disposed substantially at the center of the suction port 24, for example.

Next, the support structure of the suction nozzle 14 will be described. The suction nozzle 14 needs to be held at a position along the upper surface of the filtration net 11 as much as possible, and at the same time as the filtration net 11 rotates. It is necessary to smoothly follow the fluctuation. Therefore, the suction nozzle 14 is connected to the arm 27 extending from the bracket 19 by a universal joint 28. Then, the suction nozzle 14 is connected as shown in FIG.
As shown in (2), since the scraper 26 is supported so as to be inclined with respect to the filtering net 11, even if the scraper 26 is dragged by the filtering net 11, it does not move so as to damage the filtering net 11.

Further, two rod-shaped members 29 for sandwiching the suction nozzle 14 extend from the other arm 30 connected to the bracket 19, and the radius of the filtration net 11 of the suction nozzle 14 is increased by the rod-shaped member 29. It prevents movement in the direction. These arm portions 27 and 30
Is arranged on the front side in the rotation direction of the suction nozzle 14, so that the suction port 24 can be easily lifted and cleaned.

In the suction nozzle 14 configured as described above, a suctionable area on the filtration net 11 is specified. In order to move the solid content remaining on the filtration net 11 into the suction width of the suction nozzle 14, the sprinkling nozzle 31 for ejecting the purge liquid in conjunction with the rotating shaft 18 rotates the inside of the frame 16. It is provided at two places, a place near the center and an outer peripheral side.

The sludge separator 15 may be any one that can drop solids from an air stream containing solids. For example, a baffle plate is provided in a predetermined chamber. Structure that impinges air containing solids on the
Alternatively, there is a cyclone type or the like.

Next, the operation of the above-described filtration device 10 will be described. When the motor 22 is started, the frame 16 rotates while being inclined at a predetermined angle with respect to the horizontal plane, and the filter net 11 mounted on the perforated metal 17 is washed from the screen device 7 at its lowest point with the washing containing solids. Water is injected. The washing water passes through the filtration net 11 and the perforated metal 17 to form the water storage tank 2.
However, the solid matter that is turbid when passing through the filtration net 11 is captured and separated by the filtration net 11.
By rotating the filtration net 11 together with the frame 16, the solid content separated and removed from the washing water is carried toward the suction nozzle 14. At the same time, a clean portion of the filter net 11 is continuously supplied to a lower portion of the dropping port 23 from the screen device 7. The solid content separated from the washing water is conveyed toward the suction nozzle 14 by the rotation of the filtration net 11, and is brought into the suction area of the suction nozzle 14 by the watering nozzle 31 on the way (arrows a and b in FIG. 3). reference). While the filter net 11 is rotating, at least a small amount of water contained in the solid content is removed through the filter net 11 and the punching metal 17, and as a result, the solid content in the form of slurry or sludge is filtered. Net 11
Out of the suction nozzle 14.

On the other hand, the suction nozzle 14 strongly sucks air from the suction port 24 by activating the blower 13, and therefore, the solids carried by the filtration net 11 to the lower part of the suction port 24 are separated by the filtration net. 11 and the air sucked into the suction port 24 after passing through the punching metal 17, are peeled off from the filter net 11,
4 is taken in. At this time, since the filtering net 11 is a fine mesh of about 150 mesh as described above and is very flexible, the filtering net 11 itself also tries to suck into the suction port 24. Since the filter net 11 is kept out of contact with the suction port 24 by the rollers 25 and the scrapers 17 attached around the suction port 24, even if the filter net 11 is slightly lifted up, it will not be attracted to the suction port 24. Therefore, the rotation of the filtration net 11 is not obstructed, and the portion of the filtration net 11 from which the solid content has been almost completely removed is moved to the rear side of the suction nozzle 14, and again, the screen device 7 It is sent below the outlet 23.

In the above-described filtering device 10, the filtering net 1
Since the filtration net 11 is prevented from being sucked to the suction port 24 when the solid matter trapped by 1 is peeled off by the suction nozzle 14, even if it is a sticky solid matter, it is applied to the filtration net 11. A situation does not occur, so that clogging of the filtration network 11 can be effectively prevented, and the filtration operation can be continuously performed by the filtration network 11 which is always clean. In other words, since it is not necessary to perform a manual operation such as a cleaning operation of the filter net 11 by an operator during the filtration step, continuous operation is possible and labor can be saved. In particular, when used in a wastewater treatment process in a conventional crate cleaning machine, a failure of the high-pressure pump 3 can be prevented beforehand by a very fine filtration network of about 150 mesh, and the label peeling operation is continuously performed. Becomes possible.

In the above-described embodiment, an example was described in which the filter was used in the process of treating wash water in a crate washer. However, the filtration device of the present invention is not limited to the above-described embodiment, and may be used for filtering wastewater generated in various production processes. It is possible to use. Further, the inclination angle of the filtration network can be appropriately set according to the radius of the frame 16 or the amount of the turbid liquid to be charged, or the degree of turbidity, and is not limited to the angle shown in the above-described embodiment. Absent.

[0024]

As described above, according to the filtering apparatus of the present invention, the solid content captured by the filter sheet is immediately separated and removed by the suction nozzle, and at this time, the filter net does not stick to the suction port. With such a configuration, even if the solid content has a strong tackiness, the solid content can be reliably and efficiently removed from the filtration network. Therefore, clogging of the filtration network can be effectively prevented, continuous and long-time filtration work can be performed, and the service life of the filtration network can be extended, and the running cost can be reduced. Further, since the filtering device of the present invention is small and has a simple structure, its manufacture, installation, maintenance and inspection work and the like are easy.

[Brief description of the drawings]

FIG. 1 is a system diagram schematically showing an embodiment of the present invention.

FIG. 2 is a front view showing an embodiment of the present invention.

FIG. 3 is a plan view showing one embodiment of the present invention.

FIG. 4 is a view schematically showing a shape of a suction port of a suction nozzle in this embodiment when viewed from the rear in a rotation direction of a filtration net;

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is a block diagram showing a process of treating washing water in a conventional crate washing machine.

[Explanation of symbols]

 2 Water Storage Tank 7 Screen Device 10 Filtration Device 11 Filtration Network 12 Rotary Filter 13 Blower 14 Suction Nozzle 17 Punching Metal 18 Rotary Shaft 23 Drop Out Port 24 Suction Port 25 Roller 26 Scraper

────────────────────────────────────────────────── ─── Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B01D 33/15-33/17 B01D 33/50 B01D 33/58

Claims (1)

(57) [Claims] 1. A filtration device for separating a liquid to be filtered having a solid turbidity through a filtration sheet to perform solid-liquid separation, comprising: a liquid-permeable rotary plate rotated about an axis inclined at a predetermined angle with respect to a vertical line. The filter sheet is attached to the upper surface, and an inlet for introducing the liquid to be filtered is disposed toward a portion of the filter sheet lower than the center of rotation, and is opposed to a portion of the filter sheet higher than the center of rotation. And a suction nozzle communicated with the vacuum suction device is provided,
The suction port of the suction nozzle is formed in a slit shape along the radial direction of the filtration sheet, and the rotation center side end and the outer circumference side end of the rotation network of the suction port and the rear side in the rotation direction of the filtration sheet. And a pressing member that is in contact with the upper surface of the filter sheet and maintains a gap between the suction port and the filter sheet.