JP3177882B2 - 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 filter having a function of washing a filter medium.

[0002]

2. Description of the Related Art Heretofore, as this type of filtration device, a device for washing a filter medium by jetting washing water to the surface of a filter layer, and for supplying air and stirring with backwash water from the bottom of a filter bed to stir the air. There is a device for washing the filter medium. However, the conventional ones have drawbacks such as insufficient washing of the filter medium, a large amount of washing water and time required for washing the filter medium, and complicated and large-sized devices.

In view of the above-mentioned circumstances, the present inventors have proposed a filtering device capable of sufficiently cleaning the filter medium in advance, simplifying and reducing the size, and improving the filtering capacity. (See Japanese Patent Publication No. 61-41246).
As shown in FIG. 11, the filtering device includes a horizontal drum 10 in which a filter tank 101 made of a particulate filter medium and a space 102 are formed in the vertical direction inside and rotatably supported.
3 and a first flowing portion 104 for raw water inflow and sewage outflow through the axial center portion of the horizontal drum 103 from the outside thereof,
The first running water pipe 10 for raw water inflow and sewage outflow located in
5 and a second flushing section 106 for inflow of filtrate and washing water outflow from the outside of the horizontal drum 103 through its axis.
The second flush pipe 1 for inflow of drainage and outflow of washing water located inside
07.

The first flowing water pipe 105 and the second flowing water pipe 10
Reference numeral 7 denotes a drum 1 which is fixed to the gantry 108 so as not to rotate when the horizontal drum 103 rotates, and penetrates the axis of the drum 103 from the opposite direction to the drum 103.
It has reached 03. The drum 103 has a first flowing water pipe 105 and a second flowing water pipe 107 extending on the axis of rotation thereof.
Are rotated by a driving force of a motor (not shown) as a part of the fixed shaft. Further, a part of the first flowing water pipe 105 and a part of the second flowing water pipe 107 extending on the axis thereof are formed of the same pipe, and the first part thereof is partitioned by a partition member 109 so that the first flowing water pipe 105 and the second flowing water pipe 107 are separated from each other. Running water pipe 105 and the second
A flowing water pipe 107 is configured. The second flowing water portion 106 of the second flowing water pipe 107 has a portion 111 where the second flowing water port 110 is provided, which is covered with the filter net 112, and slides on the inner surface of the filter net 112 when the filter medium is washed. A sliding contact member 113 in contact with the filter net 112 and the portion 111 is formed. This sliding member 113
Is formed by a spiral linear member wound around the portion where the second water outlet 110 is provided. The second flowing water portion 106, the filter net 112, and the sliding member 113 constitute a strainer S. A stirring member 114 is provided on the inner peripheral surface of the horizontal drum 103 to assist the movement of the particulate filter medium when the drum 103 rotates.

Further, as disclosed in Japanese Patent Application Laid-Open No. 7-171313, a filtering space is formed by dividing the upper and lower portions into three by a partition plate provided with water holes in a rotating body, and a particulate filter medium is rotated in the filtering space. There is one that can roll inside the space with the rotation of the body, but it is simply to make the space by dividing the top and bottom into three with a partition plate with water holes, and actively function as a strainer Not what you expect.

However, in the conventional apparatus shown in FIG. 11, since the strainer can be provided only in a limited area, the area for the filtering function is small, the efficiency is low, and the backwashing time is long. Therefore, a large flow rate of washing water is required. Further, the fixed strainer has a large amount of rubbing with the granular filter medium, but the damage and the like are severe, so that maintenance such as replacement thereof is difficult. Further, in the method as disclosed in Japanese Patent Application Laid-Open No. Hei 7-171313, there is no backwashing means, and only by rubbing with the particulate filter medium, a dirt is clogged on the water holes of the upper partition plate, or The collected suspension in the filter medium may become clogged on the water holes above the lower partition plate, leading to a decrease in filtration function.

[0007]

Therefore, first, while increasing the filtration efficiency by increasing the area of the filtration net, the filter medium is slidably brought into contact with the filtration net at the time of backwashing, so that the filth adhering to the filtration net can be easily applied. To provide a filtration device capable of destroying and removing liquids and suspended matters, and capable of washing a filter medium with a small amount of washing water of about 1/10 as compared with a conventional fixed filtration device.

[0008] Second, in addition to the first problem, by arranging the second flowing section for draining inflow and washing water out of the horizontal drum, a dead space is not formed in the drum. To provide a filtering device that can make a horizontal drum smaller as much as the whole can be used as a filter tank. Third
In addition, in addition to the first or second problem, there is provided a filtration device that can easily attach and detach a filtration network, so that repair, cleaning of the filtration network, or application of a filtration network according to dirt can be easily performed. Fourth, in addition to any one of the first to third problems, the filtering net is attached to the inner surface of the lid and made detachable with the lid, so that anyone can easily attach and detach the filtering net. Therefore, it is an object of the present invention to provide a filter device which can further simplify the repair, the cleaning of the filter net, or the application of the filter net according to dirt.

Fifth, in addition to any of the first to fourth problems, the filter net is a wedge wire, and the direction of the slit during cleaning is the same as the rotation direction of the horizontal drum. It is another object of the present invention to provide a filtration device which can smoothly rub the inner wall of a drum with a granular filter medium without destroying the granular filter medium, and yet can remove the collected suspension more easily and almost completely. Sixth, in addition to any one of the first to fifth problems, by making the rotation of the horizontal drum an oscillating motion, the friction between the filter net and the filter medium is collected by reciprocating motion. To provide a filtration device capable of removing matter more easily.

[0010]

First, a horizontal drum in which a filter tank made of a particulate filter medium and a space are formed in an up-down direction inside, and an axial center portion of the horizontal drum from outside of the horizontal drum are provided with raw water. A first flow pipe for raw water inflow and sewage discharge in which the first flow section for inflow and sewage discharge is located in the space, and a drainage inflow and washing water outflow penetrating through the axial center of the horizontal drum from outside the horizontal drum; in the second flowing water unit use filtration device having a second flowing water pipe for drainage flow into and washing water outlet which is located within濾槽, is in the濾槽plate-like you rotate with said horizontal drum Filtration net
(8) is attached, and the plate-shaped filtration net (8) and the horizontal
A gap (13) is formed between the inner wall of a part of the
The gist of the present invention is a filtration device characterized in that the gap (13) is communicated with the second flowing water section (6) for draining and washing water.

Secondly, a horizontal drum in which a filter tank made of granular filter media and a space are formed in the vertical direction inside, and a shaft center portion of the horizontal drum from outside the horizontal drum are used for raw water inflow and wastewater outflow. (1) A flow pipe for raw water inflow and sewage discharge in which the flowing water portion is located in the space, and a second flow pipe for inflow of filtrate and washing water outflow are disposed outside the horizontal drum. communicates with the second flowing water portions for drainage inlet and the wash water outlet which is located, rotate together with the horizontal drum in the濾槽
A plate-shaped filtration net (8) is attached, and the plate-shaped filtration net (8) is provided.
(13) between the inner wall of the horizontal drum (3) and a part of the horizontal drum (3)
The gist of the present invention is a filtration device characterized in that the gap (13) is communicated with the second flowing water section (6) for inflow of filtered water and outflow of washing water. Thirdly, the gist of the filter device according to claim 1 or 2, wherein the plate-shaped filter net is detachably attached to a horizontal drum. Fourthly, the gist of the filter device according to any one of claims 1 to 3, wherein the plate-like filtration net is attached to an inner surface of the lid and is detachable together with the lid. Fifth, the filter net is a wedge wire composed of a number of slits formed by cutting into a substantially plate-like plate, and the direction of the slit is set to be the same as the rotation direction of the horizontal drum at the time of washing. 5. The method according to claim 1, wherein:
The gist is the filtration device described in the section. Sixthly, the gist of the filter device according to any one of claims 1 to 5, wherein the rotation of the horizontal drum of the filter device is a rocking motion.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a filtration device according to the present invention will be described based on a first embodiment. As shown in FIGS. 1 to 3, a horizontal drum 3 in which a filter tank 1 made of a granular filter medium and a space 2 are formed in the vertical direction inside, and an axial center portion of the horizontal drum 3 from outside. A first flowing water pipe 5 for raw water inflow and sewage outflow that is penetrated and a first flowing water section 4 for raw water inflow and sewage outflow is located in the space portion 2, and an axial center of the horizontal drum 3 is penetrated from outside the horizontal drum 3. In a filtering apparatus having a second flowing water pipe 7 for filtering and flowing out and washing water, a second flowing water section 6 for filtering and flowing out of washing water is located in the filter tank 1, and a plate-shaped filter (for example, A wire mesh, a perforated plate made of metal or synthetic resin, etc.) is fixed to the filter tank 1 of the horizontal drum 3 directly or by welding or bonding to a flange or the like. The entire surface is fixed by welding or the like via a bracket-shaped member or a flange 10 provided at the four ends of the lid, or Such as bolts and nuts 11 to the inner surface of the or a lid 9 in the tank 1 are then freely attached removably at. The filter net 8 is provided substantially flush with the inner surface of the horizontal drum 3 by the bracket-shaped member and the flange 10. In addition, the filtered water is collected in the gap 13 between the filter net 8 and the lid 9 or the second drain water and the second drain water are used for washing water (which may be raw water, hereinafter referred to as washing water). It is communicated with the running water section 6. The lid 9 is detachably attached to the horizontal drum 3 with bolts and nuts 12 or the like.

FIGS. 8 and 9 illustrate a case where a substantially plate-shaped filter net 8 attached to substantially the entire back surface of the lid is provided over the entire width of the horizontal drum 3. FIG. 9 (a)
As shown in the figure, the upper, lower, left and right edges of the wedge wire are preferably exchangeably attached to the entire back surface of the lid with bolts and nuts via members and flanges 10. As shown in FIG. 9 (b), a part of the wedge wire 8 is provided with a slit 8c which will be described later, and a part 8d where the slit 8c is not provided is provided.
The short pipe 8e is attached by welding or the like to the
As shown in (1), the lid is detachably attached by fitting to the second flowing water pipe 7 for inflow of drainage and outflow of washing water. The fitting portion may be a pipe with a taper, or a packing such as an O-ring may be formed in any of the pipes at the fitting portion so that the packing is embedded. Although not shown, a cover 9 is provided above the horizontal drum 3 and a filter net 8 is provided.
To the entire width or a part below the horizontal drum 3
It may be detachably mounted so that it can be replaced by fitting it to a bolt or nut or a groove provided on the inner wall of the drum on a member or flange provided on the drum. Also, as shown in FIG. 4, preferably, the filter net 8 is a wedge wire, and a large number of slits 8 formed by cuts 8a.
c ... Further, as shown in FIGS. 6 and 7, the depressions 8 alternately pushed with the slits 8a.
.., And the gap between the depression 8′c and the plate-shaped lower surface may be smaller than the diameter of the desired filter medium. As shown in FIG. 3, the lid and the filter net 8 of the wedge wire attached to the inner surface thereof may be made to coincide with the curved surface of the horizontal drum 3, or only the filter net 8 may have a flat or planar shape. Since there is no difference, the curved surface, the flat shape, and the flat shape are hereinafter referred to as a substantially plate shape in the present invention. As shown in FIG. 5, reinforcing ridges 8f are provided at desired intervals in a direction perpendicular to the slit direction on the back surface of the filtering net 8 of the wedge wire so that the filter members and the water can withstand the load. It is preferable to provide reinforcing ridges 8g at desired intervals also in the slit direction. The horizontal drum 3 is
It may be constituted by an iron cylindrical portion and both end lid portions and integrated by welding, or the lid portion and the bottomed cylindrical portion may be formed of synthetic resin and bonded together.

The horizontal drum 3 and the first flush pipe 5 for raw water inflow and sewage discharge are fitted by a bearing 16 with a dust seal 14, a gland packing 15 and the like interposed therebetween.
The bearing 16 and the end wall of the horizontal drum 3 are fixed, and the gear sprocket 17 provided with the bearing 16 is rotated by the driving force of the motor 18 (7) (the pulley and the belt may be driven). , Support frame 2 of base 19
The horizontal drum 3 is rotatably supported by three cam followers (spherical outer rings) 21 attached to the support frame 20 at intervals of 120 degrees. Further, the second flowing water section 6 for inflow of filtered water and outflow of washing water, which is in communication with the filtration network 8, is provided in the filtration tank 1.
And a second drainage pipe 7 for draining inflow and washing water outflow which is communicated with the second drainage section 6 for draining inflow and washing water, and is integrated with the bearing 22 at the other end of the horizontal drum 3. The horizontal drum 3 is rotatably supported on the bearing 22 and the support frame 20 of the base 19 by three cam followers (spherical outer rings) 23 attached to the support frame 20 at intervals of 120 degrees. is there.

The horizontal drum 3 is provided with a filtration net 8 so that the rotation of the horizontal drum 3 is stopped so that the second flowing water section 6 for draining and flushing water, which is in communication therewith, is downward.
The rotation of the horizontal drum 3 is stopped by a cam switch (not shown) provided at a desired position and a cam switch which comes into contact with the cam so that the second flushing section 6 for inflow of drainage and outflow of washing water is downward. It has become. This mechanism detects a position where the second flowing water part 6 for inflow of drainage and outflow of washing water is lowered by a sensor (not shown), and detects a rotation angle of a rotating bearing or the like (not shown). ), And the horizontal drum 3 is positioned so that the second flowing water portion 6 for inflow of filtered water and outflow of washing water is downward.
May be stopped. The fixed pipe 24 which does not rotate with the bearing 22 and communicates with the second flush pipe 7 for inflow of drainage and outflow of washing water is attached via a dust seal, a gland packing 15, a gland presser and the like. . Further, a valve control 25 is mounted on the pipe to selectively supply raw water and washing water, which will be described later, into the horizontal drum 3. Reference numeral 26 denotes a raw water inlet, reference numeral 27 denotes a treated water outlet, and reference numeral 28 denotes a drainage outlet.

In the above embodiment, the second drainage pipe 7 for inflow and outflow of washing water, which is in communication with the second inflow section 6 for inflow of filtration and outflow of washing water, is piped inside the horizontal drum 3. However, in order to increase the size of the filter tank and to prevent the filter medium from rotating and impinging on the second flush pipe 7 for draining and flushing water, as shown in FIG. The second running water pipe 7 may be provided outside the horizontal drum 3. Then, the substantially plate-shaped filtration net 8 is connected to the horizontal drum 3.
Can be attached to almost the entire length of the filter, which leads to a further increase in filtration efficiency. Further, as shown in FIG. 10, the tip of the first flowing water portion 4 for raw water inflow and sewage outflow located in the space portion 2 is plugged or the like, and water is sprayed from the side wall of the first flowing water portion 4. Alternatively, the first running water section 4 for raw water inflow and sewage outflow may be attached to the entire width of the horizontal drum 3. Because of this, efficiency can be improved. Further, the rotation of the horizontal drum 3 is a rocking motion, and a filter net 8 is preferably provided at a central portion of the inside of the horizontal drum 3, and the second flowing water pipe 7 for inflow of filtered water and outflow of washing water is connected to the horizontal drum 3. When the pipe is provided outside the drum, the size of the drum 3 can be reduced with small power, and the motor 1
8 may be rotated forward or backward by a rack or the like which reciprocates with a pinion (not shown) provided on the horizontal drum 3. An inspection window for observing the inside of the horizontal drum 3 at an arbitrary position or on the lid may be provided. FIG.
As shown in FIG.
Covered with 0 to make it portable.

In the filtration device, the raw water is supplied as shown in FIG.
As shown by the solid line arrow therein, the raw water inlet 26 → pipe 29 → first flowing water pipe 5 → first flowing water part 4 → space part 2 → filter layer surface → filtration layer 1 → substantially plate-shaped filtration network 8 → second The treated water outlet 28 is passed through the flowing water part 6 → the second flowing water pipe 7. Next, the filter medium cleaning action of the filtration device will be described. The washing water (which may be raw water) is continuously flown into the drum 3 from the second flush pipe 7 by operating a pump (not shown) or the like as indicated by a dotted arrow, and the driving means 17 drives the drum 3. To 19 or the like. As a result, when the drum 3 rotates and the granular filter material in the filter layer 1 becomes larger than the angle of repose, the granular filter material starts to collapse, the granular filter materials rub against each other, and the adhered suspended particles of the granular filter material are dissociated. It is also rubbed with a substantially plate-shaped filtration net 8 attached inside the filter, and dissociates the suspended solids on the substantially plate-shaped filtration net 8, so that it can be washed with a smaller volume of washing water especially as compared with a conventional filtration device. These dissociated adhering turbids are separated from the raw water inlet 2 as indicated by the dotted arrows indicating the flow of the washing water.
6 → second flowing water pipe 7 → second flowing water part 6 → substantially plate-shaped filtration network 8 of second flowing water part 6 → filter layer 1 → filter layer surface → space part 2 → first flowing water part 4 → first flowing water pipe Through 5, the water is discharged to the outside 27.
Therefore, in the filter medium washing of this filter device, the granular filter medium is rubbed with a substantially plate-shaped filter net provided in the drum 3,
Dissociation of the turbid matter adhered to the substantially plate-shaped filtration network, dissociation of the turbid matter adhered to the granular filter medium by rubbing between the granular filter materials, and washing from the second flowing water portion 6 in the filter layer 1 It is performed almost completely due to the synergistic effect with the outflow of water. Next, the usage of the stirring device of each of the embodiments will be described. When the filter medium is used for a predetermined time as a normal filtration device and the filter medium is backwashed with water, it is rotated by a horizontal drum driving means, and the inner circumference of the drum is rotated. The filter medium is collapsed on the surface, and the filter medium is forcibly rubbed between the filter medium and the substantially plate-shaped filter net to dissociate the attached suspended matter. In order to replace the filter net, if the filter is attached to the back of the lid and the rotation of the horizontal drum is stopped at a position where the filter can be easily removed while the filter is not in place, the filter can be replaced. It can be easily removed with the lid without spilling, making it easy to replace.

[0018]

First, the filter medium is made up of a granular filter medium on the expanded filtration network , which has an increased area for the filtration network and improved filtration efficiency.
The thickness of the filter tank is almost uniform, so the filtration efficiency is improved, and the horizontal drum is rotated during backwashing , so that the filter medium slides into the filter net without any difficulty, and yet adheres to the filter net by the movement of the filter medium It is possible to destroy and remove wastes and suspended matter, and it is possible to save a large amount of washing water, which is about 1/10 of that of a conventional fixed filtration device, and to wash in a short time. Second
In addition to the first effect, the second one for inflow of drainage and outflow of washing water
By arranging the running water pipe outside the horizontal drum, the entire inside of the drum could be made into a wide filtration tank, so that the filtration efficiency could be further improved and there was no running water pipe in the drum, so maintenance was more efficient. It's easy, and you can make a horizontal drum smaller. In addition, since the second flowing water pipe for draining water and washing water does not interfere, the first flowing water section 4 for raw water inflow and sewage water located in the space 2 is extended over the entire width of the horizontal drum. Since it is provided, raw water can be sprayed uniformly. Third, in addition to the first and second effects, since the filter net can be attached and detached, repair, cleaning of the filter net, or application of the filter net according to dirt can be easily performed. Fourth, in addition to any of the first to third effects, the filtering net is attached to the inner surface of the lid and made detachable with the lid, so that anyone can easily attach and detach the filtering net. Fifth, in addition to the effects of any one of the first to fourth aspects, it is possible to further simplify the repair, cleaning of the filtration network, or application of the filtration network in response to dirt. Sometimes the direction of the slit is the same as the rotation direction of the horizontal drum,
Since the rubbing between the inner wall of the drum and the granular filter medium is in surface contact, the rubbing can be performed smoothly, without breaking the granular filter medium, and the collected suspension can be more easily and almost completely removed without difficulty. Sixth, in addition to the effects of any one of the first to fifth aspects, the rotation of the horizontal drum is a simple swinging motion, so that the rotation is performed within the range of the rubbed portion between the filter net and the filter medium. The collected suspension can be removed more effortlessly and power can be saved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of a filtration device according to the present invention.

FIG. 2 is a right side view of FIG. 1 of the filtration device according to the present invention.

FIG. 3 is a left side view of FIG. 1 of the filtration device according to the present invention.

FIG. 4 is a partially enlarged plan view of a plate-like filtration network according to the present invention.

FIG. 5 is a partially enlarged plan view of the back surface of FIG. 4 according to the present invention.

FIG. 6 is a partially enlarged plan view of a filter net of another embodiment in the form of a plate according to the present invention.

FIG. 7 is a sectional view taken along the line AA of FIG. 6 according to the present invention;

FIG. 8 is an enlarged plan view in which a plate-shaped filtration net according to the present invention is attached to the back surface of a lid.

FIGS. 9 (a) and 9 (b) correspond to FIGS.
It is A sectional drawing.

FIG. 10 is a sectional view of a filtration device showing a second embodiment of the filtration device according to the present invention.

FIG. 11 is a cross-sectional view of a conventional filtration device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Filtration layer 2 Space part 3 Horizontal drum 4 1st running water section 5 1st running water pipe 6 2nd running water section 7 2nd running water pipe 8 Filtration net (wedge wire) 9 Lid 10 Member or flange 11 Bolt / nut 16,22 Bearing 18 Motor 19 Base 20 Support frame 21, 23 Cam follower 24 Fixed tube

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B01D 24/00-24/48 B01D 35/02

Claims (6)

(57) [Claims] 1. A horizontal drum (3) in which a filter tank (1) made of a granular filter medium and a space (2) are formed vertically inside, and a shaft from outside the horizontal drum (3). A first flow pipe (5) for raw water inflow and sewage discharge in which a first flow section (4) for raw water inflow and sewage discharge is located in the space (2), and the horizontal drum (3); A second flowing water section (6) for draining inflow and washing water flowing out through the shaft center portion from the outside and a second flowing water pipe (6) for draining inflow and washing water outflow located in the filtration tank (1). in the filtration apparatus having 7) and, on the濾槽(1) the annexed plate-shaped filter screen you rotate with said horizontal drum (3) (8), the plate-shaped filter screen
A gap between (8) and a part of the inner wall of the horizontal drum (3)
(13) The filtration device characterized by forming a gap (13) and communicating the gap (13) with the second flowing water section (6) for inflow of filtered water and outflow of washing water. 2. A horizontal drum (3) in which a filter tank (1) made of granular filter media and a space (2) are formed in the vertical direction inside, and a shaft from outside of the horizontal drum (3). The core is a raw water inflow / sewage outflow pipe (5) in which a raw water inflow / sewage outflow first water section (4) is located in the space (2), and a drainage inflow / wash water outflow pipe. A two-way water pipe (7) is provided outside the horizontal drum (3), and the pipe is connected to the filter tank (1).
With communicating the second flowing water unit (6) for to have drainage inlet and the washing water flowing out of position within the filtration to that plate-shaped rotary together with the horizontal drum (3) in the濾槽(1) in network
(8) is attached, and the plate-shaped filtration net (8) and the horizontal
A gap (13) is formed between the inner wall of a part of the
Characterized in that the gap (13) is communicated with the second flowing water section (6) for inflow of filtered water and outflow of washing water. 3. The filtering device according to claim 1, wherein the plate-like filtering net is detachably attached to the horizontal drum. 4. The filtering device according to claim 1, wherein the plate-like filtering net is attached to an inner surface of the lid and is removably attached together with the lid. . 5. The filter net (8) is cut into a substantially plate-like plate (8).
a).., a large number of slits (8
5. The wedge wire comprising: c) wherein the direction of the slit during cleaning is the same as the direction of rotation of the horizontal drum (3).
The filtration device according to any one of the above. 6. The filtering device according to claim 1, wherein the rotation of the horizontal drum of the filtering device is an oscillating motion.