JPH0838819A - Filtration device - Google Patents

Abstract

PURPOSE:To efficiently treat a liquid to be treated which contains fibers or viscous matter of label or the like by providing a retaining member which maintains a space between a suction port and a filter sheet by coming into contact with the upper surface of the filter sheet, at the rotary center lateral end part and outer periphery lateral end part of a rotating net in the suction port, and at the rear side of the filter sheet in a rotating direction. CONSTITUTION:A solid captured by a filter sheet 11 moves toward a spot higher than a rotating center by rotation of the filter sheet 11. At the spot, a suction nozzle 14 is arranged, and the solid sticking to the upper surface of the filter sheet 11 is aspirated by the suction nozzle 14 and then is removed from the filter sheet 11. The suction nozzle 14 is equipped with a slit suction port 24 in the radial direction of the filter sheet 11. In addition, the suction nozzle 14 is equipped with a rotary roller 25 which comes into contact with the upper surface of the filter sheet 11, at the end part of the rotary center side of the filter sheet 11, the end part of the outer peripheral side and at the rear side of the suction port 24. Thus the filter sheet 11 is prevented by a retaining member from uplifting toward the suction port 24.

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 solid matter from a liquid to be filtered in which the solid matter is turbid.

[0002]

2. Description of the Related Art The washing water used in various washing machines is generally subjected to a treatment such as filtration for treating the polluted treatment liquid in order to prevent pollution of the environment and at the same time reduce the amount of water used. Are reused. For example, in a crate cleaning line, it is necessary to remove soil, dust, etc. that become turbid after use, and recently, cleaning water is pressurized to a high pressure and sprayed toward the crate to simultaneously remove the label. Like this,
In such a case, the turbid solid matter may be caught in the pressure pump such as a plunger pump and cause a failure of the pressure pump.Therefore, the solid matter should be removed with higher accuracy. It is hoped that you will be treated.

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

[0004]

Conventionally, the above-mentioned screen device 7 has a structure in which solid matter is removed by a lattice-shaped screen, but the size of the solid matter that can be removed here is large. The size of the solid content allowed in the high-pressure pump 3 is quite small, whereas the size of the solid content allowed in the high-pressure pump 3 is considerably small. There was

In order to accurately separate the solids from the turbid wastewater, the solids may be filtered using a fine mesh (high mesh). However, if filtration is performed using a fine mesh filter, finer solid content can be removed, but the frequency of clogging of the filter increases and continuous operation cannot be performed.

[0006] Conventionally, as a method of removing the solid content adhering to the filter surface, the solid content is scraped from the filter by a knife edge or a scraper. However, in the filter that treats the wastewater generated from the crate cleaning line having the label peeling function described above, the fiber thread of the label and the adhesive substance are both turbid and adhere to the filter, which is scraped off with a knife edge or scraper. If this is attempted, the fibers or the sticky substance will be more tightly packed in the eyes of the filter and the life of the filter will be shortened, resulting in problems such as restriction of continuous operation.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a filtration device capable of efficiently treating a liquid to be treated including fibers such as a label and an adhesive and having less clogging. To do.

[0008]

In order to achieve the above-mentioned object, the filtration device of the present invention is a filtration device for performing solid-liquid separation by passing a liquid to be filtered in which solid matter is turbid into a vertical line. The filtration sheet is attached to the upper surface of a liquid-permeable rotary plate that is rotated around an axis inclined by a predetermined angle with respect to the filtration sheet, and an inlet for introducing the liquid to be filtered toward a position lower than the rotation center of the filtration sheet. And a suction nozzle communicating with a vacuum suction device is disposed facing a position higher than the center of rotation of the filter sheet, and the suction port of the suction nozzle is along the radial direction of the filter sheet. The suction port and the filter sheet are formed in a slit shape, and the suction port and the filter sheet are in contact with the rotation center side end portion and the outer peripheral side end portion of the rotary net of the suction port and the rear side in the rotation direction of the filtration sheet so as to contact the upper surface of the filtration sheet. When It is characterized in that a pressing member for holding the spacing is provided.

[0009]

In the filtration device of the present invention, a filtration sheet suitable for the size of the solid content to be removed is used. This filter sheet is used by being attached to the upper surface of a liquid-permeable rotating plate, which is rotating around an axis inclined by a predetermined angle with respect to the vertical line, thus causing turbidity of solids. The liquid to be filtered is introduced toward a position lower than the center of rotation of the filter sheet. 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.

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 the solid content adhering to the upper surface of the filter sheet is 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 moreover, on the upper end of the filter sheet at the end on the rotation center side, the end on the outer peripheral side, and the rear side of the suction port. Since the pressing member that comes into contact with the filter sheet is provided, this filter member prevents the filter sheet from being lifted up toward the suction port, 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. It is prevented from functioning and the solid content adhering to the upper surface of the filter sheet is effectively removed from the filter sheet by the vacuum suction action.

That is, in the filtration device of the present invention, the solid matter is peeled off from the filtration sheet by vacuum pressure.
Since the action of scraping the solid matter from the filter net does not occur, it is possible to effectively prevent clogging of the filter sheet and efficiently regenerate the filter sheet into a continuously usable state.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described based on the embodiments shown in the drawings. FIG. 1 is a schematic view showing an embodiment of the present invention, which is an example configured to remove finer solids from the circulating water while being charged into the water storage tank 2 from the screen device 7 described above. is there. Reference numeral 1 in FIG.
0 indicates the entire filtering device, and this filtering device 10 is, for example, 1
A rotary filter 12 for rotating a 50-mesh (JIS 105μ) filter net 11 and a blower 1 as a solid content removing means.
3 is provided with a suction nozzle 14 and a sludge separator 15 for separating solids in the process from the suction nozzle 14 to the blower 13.

The rotary filter 12, which is a main constituent member in this embodiment, performs filtration in about half of the area by rotating the filter net 11 and, at the other half of the area, solid nets 11 for filtering solids. It is configured to be separated from. More specifically, the cylindrical frame 1
A punching metal 17 having a large number of minute holes is attached to the bottom of 6 to provide a liquid-permeable structure. The frame body 16 is rotatably supported by attaching the center portion of the punching metal 17 to the lower end portion of the rotary shaft 18 by fixing means such as bolts and nuts.

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

Of the filtering net 11 inclined as described above, the cleaning liquid dropping port 23 from the screen device 7 is disposed so as to face the lowest position, and the most part of the filtering net 11 is provided. The suction nozzle 14 is arranged so as to face the high place. The suction nozzle 14 has a slit-shaped suction port 24 extending in the radial direction of the filter net 11, and the suction port 24 has an end on the rotation center side and an end on the outer peripheral side of the filter net 11. Rollers 25 are attached to both. As shown in FIG. 2 to FIG. 4, the roller 25 includes a frame 16 at the inner and outer circumferences of the filter net 11.
It comes into contact with the upper surface of the ring attached to the roller and rolls, and holds the suction port 24 of the suction nozzle 14 in a state of being slightly lifted from the upper surface of the filter net 11. Further, the back side of the suction port 24, that is, the filter net 11
A scraper 26, which is in sliding contact with the upper surface of the filter mesh 11, is attached to the rear side in the rotating direction of the suction port 24 over substantially the entire width of the suction port 24. The roller 25 and the scraper 26 are attached to the suction nozzle 14 through the suction port 2 respectively.
It is arranged so that the height protruding 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 provided between the suction port 24 and the surface of the filter net 11. It is designed to be maintained at an interval of. Further, since the scraper 26 may be disposed on the rear side of the suction port 24 in the rotation direction of the filter net 11, it may be disposed, for example, substantially at the center of the suction port 24.

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 filter net 11 as much as possible, and at the same time, the suction nozzle 14 is rotated as the filter net 11 rotates. It is necessary to smoothly follow fluctuations. Therefore, the suction nozzle 14 is connected to the arm portion 27 extending from the bracket 19 by the universal joint 28. The suction nozzle 14 is shown in FIG.
Since the scraper 26 is supported so as to be inclined with respect to the filtration net 11 as shown in FIG. 6, even if the scraper 26 is dragged by the filtration net 11, it does not move so as to damage the filtration net 11.

Further, two rod-shaped members 29 for sandwiching the suction nozzle 14 extend from another arm portion 30 connected to the bracket 19, and the radius of the filter net 11 of the suction nozzle 14 is made by the rod-shaped members 29. It is designed to prevent movement in the direction. These arm portions 27, 30
Is disposed on the front side in the rotation direction of the suction nozzle 14, it is easy to lift and clean the suction port 24.

In the suction nozzle 14 thus constructed, the suctionable area on the filter net 11 is specified. Therefore, the water spray nozzle 31 that ejects the purge liquid in conjunction with the rotation shaft 18 rotates inside the frame 16 so that the solid content remaining on the filter net 11 is moved into the suction width of the suction nozzle 14. It is provided in two places, near the center and on the outer peripheral side.

The sludge separator 15 may be of any type as long as it can drop and remove the solid content from the air stream containing the solid content. For example, a baffle plate is provided in a predetermined chamber. A structure that causes air containing solids to collide with
There is also a cyclone type.

Next, the operation of the above-described filtration device 10 will be described. When the motor 22 is started, the frame 16 rotates in a state of being inclined at a predetermined angle with respect to the horizontal plane, and the filter net 11 mounted on the punching metal 17 is washed from the screen device 7 at the lowest position with the solid content. Water is added. The wash water passes through the filter net 11 and the punching metal 17 to allow the water tank 2
However, the solid content that is turbid when passing through the filter net 11 is captured and separated by the filter net 11.
By rotating the filter net 11 together with the frame body 16, the solid content separated and removed from the wash water is carried toward the suction nozzle 14. At the same time, a clean portion of the filter net 11 is continuously supplied to the lower portion of the dropping port 23 from the screen device 7. The solid content separated from the washing water is carried toward the suction nozzle 14 by the rotation of the filter net 11, and is moved to the suction area of the suction nozzle 14 by the water sprinkling nozzle 31 in the middle thereof (arrows A and R in FIG. 3). reference). While the filter screen 11 is rotating, even a small amount of water contained in the solid content passes through the filter screen 11 and the punching metal 17 and is removed. As a result, the solid content in the form of slurry or sludge is filtered. Net 11
Of these, the highest position, that is, the lower part of the suction nozzle 14 is reached.

On the other hand, the suction nozzle 14 strongly sucks air from the suction port 24 by activating the blower 13, so that the solid content carried to the lower part of the suction port 24 by the filter net 11 is filtered. 11 and the punching metal 17 and the air sucked into the suction port 24 are peeled off from the filter net 11 together with the suction nozzle 1.
Taken in 4. At this time, since the filter net 11 has a fine mesh of about 150 mesh as described above and is extremely flexible, the filter net 11 itself tries to suck the suction port 24, but as described above. Since the filter net 11 is prevented from coming into contact with the suction port 24 by the roller 25 and the scraper 17 attached around the suction port 24, even if the filter net 11 slightly floats up, it will not be sucked by the suction port 24. Therefore, the rotation of the filter net 11 is not hindered, and the part of the filter net 11 from which the solid content is almost completely removed is moved to the rear side of the suction nozzle 14, and again the screen device 7 described above is operated. It is sent below the dropping port 23.

In the above-described filtration device 10, the filtration net 1
Since the filter net 11 is prevented from being sucked by the suction port 24 when the solid matter captured by 1 is peeled off by the suction nozzle 14, even if the sticky solid matter is applied to the filter net 11. This does not occur, and therefore, the clogging of the filter net 11 can be effectively prevented, and the filtering action can be continuously performed by the filter net 11 which is always in a clean state. In other words, since it is not necessary for the operator to manually perform the cleaning work of the filter net 11 during the filtration process, continuous operation becomes possible and labor saving can be achieved. In particular, when used in a wastewater treatment process in a conventional crate washing machine, a failure of the high-pressure pump 3 can be prevented by a very fine filter mesh of about 150 mesh, and the label peeling work can be continuously performed. Will be possible.

In the above-mentioned embodiment, the example used for the treatment process of the washing water in the crate washer has been described, but the filtering device according to the present invention is not limited to the above-mentioned embodiment, and can be applied to the filtration of waste water generated in various production processes. It is possible to use. Further, the angle of inclination of the filter net can be appropriately set depending on the radius of the frame 16, the amount of the turbid liquid to be charged, the degree of turbidity thereof, etc., and is not limited to the angle shown in the above-mentioned embodiment. Absent.

[0024]

As described above, according to the filtration apparatus of the present invention, the solid content captured by the filtration sheet is immediately peeled and removed by the suction nozzle, and the filtration net does not stick to the suction port at that time. With this configuration, even if the solid content has a strong adhesiveness, the solid content can be reliably and efficiently removed from the filtration net. Therefore, it is possible to effectively prevent clogging of the filter net, to perform continuous and long-time filtration work, to extend the useful life of the filter net, and eventually to reduce the running cost. Furthermore, since the filtering device of the present invention is small and has a simple structure, its manufacturing, installation, maintenance, and inspection work are easy.

[Brief description of 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 an embodiment of the present invention.

FIG. 4 is a diagram schematically showing the shape of the suction port of the suction nozzle in this embodiment as seen from the rear side in the rotation direction of the filter mesh.

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 net 12 Rotary filter 13 Blower 14 Suction nozzle 17 Punching metal 18 Rotating shaft 23 Dropping port 24 Suction port 25 Roller 26 Scraper

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical indication B01D 33/58

Claims (1)

[Claims] 1. A filtration device for solid-liquid separation by passing a turbid liquid to be filtered through a filtration sheet, comprising a liquid-permeable rotary plate which is rotated about an axis inclined at a predetermined angle with respect to a vertical line. The filtration sheet is attached to the upper surface, and an inlet for introducing the liquid to be filtered toward a location lower than the rotation center of the filtration sheet is arranged, and the filtration sheet faces a location higher than the rotation center. And a suction nozzle that is in communication with the vacuum suction device is installed,
The suction port of the suction nozzle is formed in a slit shape along the radial direction of the filter sheet, and further, the end of the rotary mesh on the rotation center side and the outer peripheral side of the suction port and the rear side in the rotation direction of the filter sheet. A filter device, further comprising: a pressing member that is in contact with an upper surface of the filter sheet and holds a gap between the suction port and the filter sheet.