JP2008188529A - Filtration unit and filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently filter raw water with a plurality of stages of an activated carbon cartridge by prompting the sufficient removal of suspensoid and the adsorption of dissolved matter while preventing blocking of the flow of the raw water. <P>SOLUTION: A filtration unit is provided with a casing 1 in which the raw water W introduced to the inside from an introducing port 2 of one end side, flows toward another end side and is discharged from a discharge port 3 and the activated carbon cartridges 4 arranged with a certain interval in the flow direction F of the raw water W and filtering the raw water W. An escape flow passage 5 through which the raw water W is passed without being passed through the activated carbon cartridges 4 is provided to have a surface area smaller than the activated carbon cartridges 4 in the cross-section crossing the flow direction F at a right angle between the activated carbon cartridges 4 and an inner wall 1a of the casing 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a filtration unit that removes turbidity of raw water by an activated carbon cartridge and absorbs and dissolves dissolved substances when filtering raw water to obtain purified water, and a filtration device constituted by a plurality of the filtration units. Is.

As such a filtration apparatus constituted by a plurality of units provided with activated carbon as a cartridge, for example, in Patent Document 1, a unit in which granular activated carbon is stored in a storage portion between metal honeycomb strainers facing each other is treated. It has been proposed to install multiple units in series in a water channel facing each other in the direction of water flow so that they can be attached and detached, and after removing and cleaning the units with reduced purification capacity, they are installed again at the end of the units. ing. In Patent Document 2, a plurality of filtration units each having an inlet for raw water and an outlet after filtration and provided with a filtration layer made of activated carbon are detachably stacked to reduce the installation space. In addition, it has been proposed to perform continuous filtration by separately washing between filtration units.
JP 2002-28406 A JP 2002-66210 A

  By the way, in these conventional filtration units, in the thing of patent documents 1, the unit is made into the cartridge itself which stored activated carbon as mentioned above, and such activated carbon cartridge is obstructing the channel through which treated water flows. A filter made of activated carbon in the inside of a cylindrical container or the like provided with the inlet and the outlet at the upper and lower ends in the one described in Patent Document 2 as well. The layer is arranged so as to close and close the inside of the container, thereby forming a cartridge. Therefore, the turbidity in the raw water adheres to the activated carbon in order from the side facing the flow direction of the raw water in the activated carbon cartridge (the flowing direction in Patent Document 1 and the vertical direction from the inlet to the outlet in Patent Document 2). It will be collected.

  Therefore, the clogging of the cartridge due to such turbidity also proceeds from the side opposite to this flow direction. If the clogging of the raw water in the cartridge is blocked by this clogging, the raw water overflows from the water channel. I'll be relaxed. For this reason, in the part opposite to this in the flow direction side of the cartridge, the activated carbon cartridge is not used in the one described in Patent Document 1, although the activated carbon still has sufficient adsorption capacity without being broken through. In the case of taking out from the water channel and described in Patent Document 2, it is necessary to stop the injection of raw water into the unit and wash the activated carbon in both cases, and the frequency at which the cartridge or the unit becomes unusable for washing. Increased results in hindering efficient filtration.

  The present invention has been made under such a background, and while preventing the flow of raw water from being blocked, the multi-stage activated carbon cartridge promotes sufficient removal of turbidity and adsorption of dissolved substances, thereby improving efficiency. It is an object of the present invention to provide a filtration unit capable of achieving proper filtration and a filtration device constituted by a plurality of the filtration units.

  In order to solve the above-described problems and achieve such an object, the filtration unit of the present invention is configured so that the raw water introduced into the inside from the inlet on one end side is circulated toward the other end and is discharged from the outlet. A casing to be discharged, and an activated carbon cartridge arranged in a plurality of stages at intervals in the casing in the flow direction of the raw water to filter the raw water, and these activated carbon cartridges or the activated carbon cartridge And an inner wall of the casing, an escape passage for circulating the raw water without passing through the activated carbon cartridge is provided in a cross section perpendicular to the flow direction in a plane area smaller than that of the activated carbon cartridge. It is characterized by being. Further, the filtration device of the present invention is characterized in that a plurality of such filtration units are configured by connecting the inlet and the outlet to each other.

In such a filtration unit, most of the raw water introduced into the casing from the inlet on the one end side of the casing passes through the activated carbon cartridge having a large flat area, while the rest passes through the escape passage. It flows into the space between the next stage activated carbon cartridge.
The raw water that has flowed into the gap portion is partly escaped and flows into the gap portion between the next-stage activated carbon cartridge through the flow path, but most of the raw water passes through the next-stage activated carbon cartridge. Will do. By repeating such filtration in the flow direction with a plurality of stages of activated carbon cartridges, sufficient turbidity and dissolved substances can be reduced in the raw water discharged from the discharge port. If the escape flow rate in the first stage is 1/10, the amount of raw water that does not theoretically pass through the activated carbon cartridge is 1/100 in the second stage, 1/1000 in the third stage, and 1/10000 in the fourth stage. Sufficient filtration will be performed.

  Further, in the filtration unit, the escape flow path is positioned between the activated carbon cartridges adjacent to each other in the flow direction of the raw water on the sides separated from each other in the casing as viewed along the flow direction. Thus, most of the raw water flowing into the space between the next stage activated carbon cartridge through the escape passage can be filtered by this next stage activated carbon cartridge. Therefore, the turbidity of the raw water flowing into the space between the next-stage activated carbon cartridges can be further reliably reduced, and more efficient filtration can be promoted.

  In order to form such an escape passage, the activated carbon cartridge is disposed with a space between the inner wall of the casing and the portion with the gap is defined as the escape passage. do it. The activated carbon cartridge may be disposed so as to be in close contact with the inner wall of the casing, and the escape passage may be formed so as to penetrate the activated carbon cartridge itself.

  According to the filtration unit having the above configuration, by providing the escape passage, it is possible to prevent a situation in which the flow of raw water in the casing overflows due to clogging of the activated carbon cartridge. This enables efficient removal of turbidity and dissolved substances in individual activated carbon cartridges. Moreover, in the said filtration apparatus which connected such a filtration unit, it becomes possible to aim at adsorption | suction of a dissolved substance by aiming at the more reliable reduction of turbidity in the raw | natural water finally discharged | emitted.

  On the other hand, when the activated carbon cartridge is blocked by the turbidity of raw water, the activated carbon cartridge is washed. Accordingly, a cleaning means for cleaning the activated carbon cartridge is provided, and a discharge pipe for the cleaning waste liquid from which the activated carbon cartridge is cleaned is disposed at the upper position of each stage of the activated carbon cartridge, so that the cleaning means is disposed above the activated carbon cartridge. It becomes possible to efficiently discharge the cleaning waste liquid containing a large amount of suspended turbidity without passing the activated carbon cartridge again.

  In particular, when the plurality of filtration units are configured by connecting their inlets and outlets like the filtration device, the raw water filtered by the activated carbon cartridge is introduced into the casing. By providing the drainage channel extending from the other end side to the one end side and providing the discharge port on the one end side of the casing, each filtration unit extends in the direction of the flow. It is possible to provide a relatively compact filtration device that can be avoided.

  As described above, according to the filtration unit and the filtration device of the present invention, it is possible to prevent a situation where the flow of raw water is blocked and an overflow occurs, and the activated carbon cartridge is effectively used. The raw water can be filtered, and the frequency of washing the activated carbon cartridge can be reduced to promote efficient filtration.

  1 and 2 show a first embodiment of a filtration unit according to the present invention. For example, when purifying raw water W taken from a river or the like, turbidity is removed and dissolved substances are adsorbed. Used to do. In the present embodiment, the casing 1 is formed in a box shape having an outer shape of a square column extending in the vertical direction by a metal material such as stainless steel. An outlet 3 for the filtered raw water W is formed on the end face. Therefore, in this embodiment, the direction from the top to the bottom in the casing 1 is the flow direction F of the raw water W. The introduction port 2 is located at a position where the inner wall 1a of the casing 1 is offset from one of the four sides of the square in the cross section perpendicular to the flow direction F, and the discharge port 3 is formed in the present embodiment. Then, of the square sides, they are formed at positions shifted to the other one side opposite to the side on which the introduction port 2 is offset as viewed from above.

  In the casing 1, a plurality (four in the present embodiment) of activated carbon cartridges 4 are arranged at equal intervals in the flow direction F. These activated carbon cartridges 4 accommodate a large number of granular activated carbons, for example, inside a box having a large number of water passage holes smaller than the particle diameters of the individual granular activated carbons, and the meshes are larger than the particle diameters of the individual granular activated carbons. The cartridge is housed in a small reticulate body and is formed into a cartridge. In this embodiment, the outer shape is a rectangular plate having the same shape and the same size. The activated carbon cartridges 4 have a length that can be inserted into a square formed in the above and a width that is slightly shorter than the length, and the thickness is smaller than the width of the rectangular surface and adjacent to the flow direction F. Is larger than the interval.

  Such an activated carbon cartridge 4 has the rectangular surface horizontal, and the direction of the length of the rectangular surface is such that the introduction port 2 and the discharge port 3 are out of the four sides of the square formed by the inner wall 1a of the casing 1. Each of them is parallel to two opposite sides on the offset side, and is accommodated and disposed in the casing 1 by being supported by, for example, a support member such as an angle (not shown) protruding from the inner wall 2a. Therefore, the pair of side surfaces of the activated carbon cartridge 4 extending in the width direction of the rectangular surface are the remaining ones of the inner wall 1a of the casing 1 other than the two opposite sides of the square formed by the inner wall 1a as shown in FIG. It will be arrange | positioned so that it may closely_contact | adhere to the inner wall 1a part extended along two sides.

  Further, each activated carbon cartridge 4 has one of a pair of side surfaces extending in the length direction of the rectangular surface, one of the two opposite sides of the square formed by the inner wall 1a of the inner wall 1a of the casing 1. The inner wall 1a extending along the inner wall 1a is also in close contact with the other side of the activated carbon cartridge 4 opposite to the one side and the two opposite sides of the inner wall 1a of the casing 1. A space is provided between the inner wall 1a portion extending along the other side. And the part which opened this space | interval is made into the escape area 5 in this embodiment in the cross section orthogonal to the said flow direction F, and is made into a plane area smaller than the activated carbon cartridge 4. In FIG.

  Here, the escape flow path 5 in the present embodiment is positioned on the side away from each other as shown in FIG. That is, in the present embodiment, the activated carbon cartridge 4 positioned at the top of the plurality of activated carbon cartridges 4 has a rectangular surface length on the inner wall 1a portion of the inner wall 1a of the casing 1 on the side where the introduction port 2 is offset. The next activated carbon cartridge 4 is disposed on the inner wall 1a portion on the side where the opposite discharge port 3 is offset, and the next activated carbon cartridge 4 is further disposed. The introduction port 2 is in close contact with the inner wall 1a portion on the side where the introduction port 2 is offset, and the activated carbon cartridge 4 located at the lowermost stage is again in close contact with the inner wall 1a portion on the discharge port 3 side.

  Therefore, on the contrary, the escape flow path 5 is alternately arranged on the discharge port 3 side and the introduction port 2 side in order from the uppermost stage, that is, at the stage adjacent to the flow direction F. The activated carbon cartridges 4 are arranged on the side away from each other in the direction orthogonal to the flow direction F. Further, these escape passages 5 are located away from the inlet 2 at the stage of the uppermost activated carbon cartridge 4 on one end side of the casing 1 and at the stage of the lowermost activated carbon cartridge 4 at the other end side. It is arranged at a position away from the discharge port 3 as well.

  In the filtration unit configured as described above, the raw water W introduced into the casing 1 from the introduction port 2 is mostly located directly below the introduction port 2 so as to face the flow direction F. By passing through the activated carbon cartridge 4 from the upper part of the uppermost activated carbon cartridge 4 to be disposed, turbidity adheres and is removed, and dissolved substances are adsorbed and filtered, while the rest A part of the activated carbon cartridge 4 passes through the escape channel 5 without passing through the activated carbon cartridge 4, so that a part of the gap is formed between the uppermost activated carbon cartridge 4 and the activated carbon cartridge 4 in the next stage. be introduced.

  Further, the raw water W introduced into the space from the escape flow path 5 is filtered through the most part of the activated carbon cartridge 4 and the raw water W that has passed through the uppermost activated carbon cartridge 4. At the same time, the remaining part is introduced from the escape channel 5 formed in the next stage of the activated carbon cartridge 4 into the space between the activated carbon cartridge 4 in the next stage and such operations are sequentially performed in the flow direction F. By being repeated, the raw water W is gradually filtered and activated carbon adsorbed to be purified.

  Therefore, in the activated carbon cartridge 4 at each stage, the activated carbon cartridge 4 is clogged with turbidity on the side facing the flow direction F of the activated carbon cartridge 4 that comes into contact with the raw water W first (in the present embodiment, the upper portion of the activated carbon cartridge 4). Even if it occurs, the raw water W can be released from the flow path 5 and introduced into the space between the next stage activated carbon cartridge 4 and introduced into the casing 1 from the inlet 2 even if it occurs. It is possible to prevent a situation where the raw water W overflows.

The raw water W thus introduced into the space between the next-stage activated carbon cartridge 4 is filtered by the next-stage activated carbon cartridge 4 and is clogged in the previous-stage activated carbon cartridge 4 so that the previous-stage activated carbon cartridge 4 is clogged. Even when the raw water W does not pass through the cartridge 4, the dissolved substance is adsorbed at the part in contact with the activated carbon on the flow direction F side (in the present embodiment, the lower part of the preceding activated carbon cartridge 4).
Such an operation is sequentially repeated for the raw water W introduced into the interval portion of the adjacent activated carbon cartridges 4.

  Therefore, according to the filtration unit, even if a part of the raw water W is escaped without being filtered in each stage of the activated carbon cartridge 4, the raw water W discharged from the discharge port 3 has a sufficient turbidity reduction. On the other hand, in each activated carbon cartridge 4, the activated carbon contained therein can be effectively used to efficiently adsorb dissolved substances, thereby reducing the cleaning frequency of the activated carbon cartridge 4. It becomes possible to promote smooth filtration of the raw water W.

  Further, particularly in the present embodiment, the escape channel 5 is a square formed by the inner wall 1a of the casing 1 in a cross section orthogonal to the flow direction F between the activated carbon cartridges 4 adjacent to the flow direction F of the raw water W. Since they are alternately arranged on the two opposite sides, that is, when viewed along the flow direction F, they are positioned on the sides away from each other in the casing 1, so Most of the raw water W introduced between the second stage activated carbon cartridge 4 can be filtered by the next stage activated carbon cartridge 4 and the activated carbon on the flow direction F side of the previous stage activated carbon cartridge 4. For this reason, even if the escape flow path 5 is provided, it is possible to effectively prevent the raw water W containing turbidity and dissolved substances from passing through the casing 1 as it is and being discharged from the discharge port 4. Can do.

  Moreover, in the present embodiment, the escape passage 5 provided for the activated carbon cartridge 4 on the most one end side (upper end side) of the casing 1 among the plurality of stages of activated carbon cartridges 4 is provided on one end side of the casing 1. Since the raw water W with much turbidity introduced into the casing 1 from the introduction port 2 is allowed to escape as it is from the introduction channel 2 to the next stage activated carbon cartridge 4. It is possible to avoid flowing in between. On the other hand, the escape passage 5 provided for the activated carbon cartridge 4 on the most other end side (lower end side) of the casing 1 is also positioned on the side away from the discharge port 3 provided on the other end side of the casing 1. Therefore, even for the raw water W discharged from the discharge port 3, turbidity can be removed and dissolved substances can be adsorbed by the activated carbon cartridge 4 on the other end side, particularly the activated carbon on the flow direction F side. It becomes possible to discharge clearer raw water W.

  By the way, in this 1st Embodiment, while the casing 1 has comprised the box shape of the external shape square columnar shape, the activated carbon cartridge 4 is a rectangle which has a length which can be inserted and inserted in the square which the inner wall 1a of this casing 1 makes. The activated carbon cartridge 4 is formed in a flat plate shape, and alternately disposed on the two opposite sides of the square in the flow direction F, so that it is opposite to the side on which the activated carbon cartridge 4 is disposed. The escape channel 5 is formed so that the activated carbon cartridge 4 is partially spaced from the inner wall 1a of the casing 1 on the side. For example, the book shown in FIGS. As in the second embodiment of the filtration unit of the invention, the activated carbon cartridge 4 is disposed so as to be in close contact with the entire circumference of the inner wall 1a of the casing 1, and this activated carbon cartridge The relief channel 5 in itself may be formed so as to penetrate in the flow direction F. In the third to fifth embodiments that describe the second embodiment from the beginning, elements that are the same as those in the first embodiment are assigned the same reference numerals, and descriptions thereof are omitted.

  That is, in the second embodiment, the activated carbon cartridge 4 is formed into a square plate shape having a size that can be fitted and inserted into the square formed by the inner wall 1a of the casing 1, and extends along the four sides of the square surface. All four side surfaces are disposed in close contact with the inner wall 1a of the casing 1 with a plurality of intervals in the flow direction F. In the activated carbon cartridge 4, in this embodiment, a hole penetrating the activated carbon cartridge 4 in the thickness direction is formed at a position offset from one corner of the square surface. An escape passage 5 is provided. Here, the hole forming the escape passage 5 may be, for example, a pipe inserted and attached so as to penetrate the activated carbon cartridge 4, but the sectional area thereof is the activated carbon cartridge 4 excluding the escape passage 5. Is smaller than the area of the square surface.

  In the present embodiment, there are a plurality of such activated carbon cartridges 4 (four in the present embodiment), the corners of which the square surfaces are perpendicular to the flow direction F as shown in FIG. The inner wall 1a of the casing 1 is alternately positioned at a pair of corners opposed to one diagonal line of a square formed in a cross section perpendicular to the flow direction F, so that the inside of the casing 1 Are contained at intervals. Further, the introduction port 2 provided on the upper surface of the casing 1 is opposite to the escape flow path 5 of the activated carbon cartridge 4 located on the most end side (upper end side) of the casing 1 out of the pair of corner portions of the square. A discharge port 3 provided at a position near the corner on the side and on the lower surface of the casing 1 is located on the opposite side of the escape flow path 5 of the activated carbon cartridge 4 located on the most other end side (lower end side) of the casing 1. Each is formed at a position offset from the corner.

  Also in the filtration unit of the second embodiment, a part of the raw water W introduced in the same manner as in the first embodiment by the escape passage 5 penetrating the activated carbon cartridge 4 of each stage. Without being filtered by the activated carbon in the activated carbon cartridge 4, it is possible to perform filtration while escaping between the activated carbon cartridge 4 of the next stage, and preventing the overflow of the introduced raw water W and each activated carbon cartridge 4 By effectively utilizing the activated carbon on the flow direction F side, efficient filtration can be performed. In addition, since the escape channel 5 and the inlet 2 and outlet 3 of the raw water W are alternately arranged in the square direction formed by the inner wall 1a as described above in the flow direction F, It is possible to prevent the raw water W containing turbidity from being discharged as it is and to promote reliable filtration.

  In these first and second embodiments, the casing 1 is a square box shape, and the activated carbon cartridge 4 also has a rectangular flat plate shape that can be accommodated in the casing 1 with three or four side surfaces in close contact with each other. The casing 1 may be in the shape of a square plate, but the casing 1 may be in the shape of another polygonal column such as a rectangle, or a box shape such as a cylinder. The activated carbon cartridge 4 is also configured according to the shape of the casing 1. The shape of the casing 1 and the activated carbon cartridge 4 is not limited. In the first and second embodiments, the inlet 2 of the raw water W is provided at the upper end surface of the casing 1 and the outlet 3 is provided at the lower end surface, and the direction from the top to the bottom is the flow direction of the raw water W. On the contrary, the inlet port 2 is formed at the lower end surface and the outlet port 3 is formed at the upper end surface so that the direction from the bottom to the top is the flow direction F, and the casing 1 is placed horizontally. Then, the raw water W may be circulated in the horizontal direction.

  On the other hand, in the first embodiment, the activated carbon cartridge 4 is a rectangular flat plate with respect to the inner wall 1a of the casing 1 having a square cross section as described above, and one side surface extending in the length direction is spaced from the inner wall 1a. In the meantime, each part is used as the escape flow path 5, but the activated carbon cartridge 4 is shaped so as to be in close contact over the entire circumference of the inner wall 1 a as in the second embodiment, and activated carbon is provided on the side surface thereof. A recess penetrating in the thickness direction of the cartridge 4 may be partially formed, and an escape passage 5 may be formed between the recess and the inner wall 1a. For example, if a recess is formed so as to cut out one corner of the square surface of the square flat activated carbon cartridge 4, the escape channel 5 is formed in the square corner formed by the inner wall 1 a as in the second embodiment. Can be formed.

  Further, the shape of the escape passage 5 formed in this way, in particular, the cross-sectional shape orthogonal to the flow direction F is not limited. This is the same in the second embodiment. For example, as in the first embodiment, the long hole-shaped escape passage 5 is formed so that the inner wall 1a of the casing 1 is along one side of the square formed in the cross section. You may make it penetrate in the activated carbon cartridge 4. FIG.

  By the way, when the raw water W is filtered by such a filtration unit and the turbidity is adhered to the activated carbon, the activated carbon cartridge 4 is washed to adhere the suspended turbidity no matter how efficient the filtration is. Must be removed. However, in this case, for example, the activated carbon cartridge 4 may be removed from the casing 1 for cleaning, but the activated carbon cartridge 4 itself includes the cleaning means 11 as in the third embodiment shown in FIG. You may make it wash | clean in the casing 1. FIG. The third embodiment shows a case where the configuration according to the first embodiment shown in FIGS. 1 and 2 is applied.

  Also in the third embodiment, the raw water W is circulated in the casing 1 with the vertical direction as the flow direction F, particularly from the top to the bottom, and each activated carbon cartridge 4 has the washing means 11 in the lower part thereof. A plurality of physical cleaning pipes that separate air turbidity adsorbed on the activated carbon by ejecting air or washing water into the activated carbon cartridge 4 are built in at intervals, and these pipes are compressed air (not shown). And connected to a source of cleaning water. Moreover, in this 3rd Embodiment, many discharge pipes 12 of the physical washing wastewater are attached to the casing 1 so as to open and close to the inner wall 1a of the casing 1, and these discharge pipes 12 The upper stage of the activated carbon cartridge 4 of the stage and the upper surface of the lower end surface of the casing 1, that is, the bottom surface in the casing 1 are disposed so as to open.

  In the filtration unit of the third embodiment, when the activated carbon cartridge 4 is washed, first, the introduction of the raw water from the inlet 2 and the discharge from the outlet 4 are stopped, and the raw water is placed in the casing 1. While holding W, air or washing water is ejected from the above-mentioned physical washing pipe as the washing means 11, the turbidity adhering to the activated carbon is peeled off and floated on the upper part of each activated carbon cartridge 4. Then, the turbid matter that peels off and floats on the upper part of the activated carbon cartridge 4 is sucked out from the upper position of the activated carbon cartridge 4 and discharged by opening the discharge pipe 12 of the physical cleaning wastewater.

  Therefore, according to the filtration unit of the third embodiment, the activated carbon cartridge 4 can be cleaned while being accommodated in the casing 1 without being taken out of the casing 1, and the cleaning operation can be performed. The time required can be reduced. Further, since the waste liquid from which the turbidity is raised by this washing is discharged from the upper position of the activated carbon cartridge 4 by the discharge pipe 12, the waste liquid is discharged together with the raw water W in the casing 1 from the discharge port 3, for example. On the other hand, turbidity can be prevented from reattaching to the activated carbon of the activated carbon cartridge 4, and the filtration performance of the activated carbon cartridge 4 can be reliably restored.

  Moreover, in these 1st-3rd embodiment which made the distribution | circulation direction F of the raw | natural water W downward from the top, the inlet 2 of the raw | natural water W is one end side, ie, an upper end side, and the discharge port 3 is the other end side, ie, the lower end side. The raw water W filtered by the activated carbon cartridge 4 is introduced as in the fourth embodiment shown in FIGS. 6 and 7 and the filtration unit of the fifth embodiment shown in FIGS. 8 and 9. The drainage channel 13 is provided in the casing 1 so as to extend from the other end side in the flow direction F toward the one end side, and the discharge port 3 is provided on one end side of the casing 1 through the drainage channel 13. May be. Here, the fourth embodiment shows a case where the configuration is applied to the first embodiment, and the fifth embodiment shows a case where the configuration is applied to the second embodiment.

  That is, in 4th Embodiment, while the casing 1 is made into the square columnar box shape in which the cross section orthogonal to the distribution direction F (up-down direction) of the raw | natural water W makes a rectangle, In the cross section, a partition wall 1b that bisects the pair of short sides of the rectangle perpendicularly to the long side extends vertically downward from the upper end surface in the casing 1 and is directly above the lower end surface (the lowest step). The side (left side in FIGS. 6 and 7) on which the inlet 2 in the casing 1 thus partitioned is provided is in the flow direction F. In an orthogonal cross section, the inner wall 1a and the partition wall 1b form a square shape, and a multi-stage activated carbon cartridge 4 is disposed on this side as in the first embodiment. In the present embodiment, the inlet 2 is opened in a horizontally extending rectangular shape at the upper end of the inner wall 1a of the casing 1 along the short side of the rectangle.

  And in this embodiment, the part between the partition wall 1b and the inner wall 1a on the opposite side to the side where this activated carbon cartridge 4 is arrange | positioned is one end side from the other end side of the said distribution direction F, ie, a lower end side. That is, the drainage channel 13 extends to the upper end side, and the upper end portion, that is, one end side of the inner wall 1a of the casing 1 along the short side of the rectangle opposite to the inner wall 1a in which the introduction port 2 is provided. A rectangular discharge port 3 extending in the horizontal direction is formed. Accordingly, the raw water W introduced into the casing 1 from the introduction port 2 is filtered by the activated carbon cartridge 4 while flowing downward, and then the drainage channel 13 from between the lower end surface of the bottom of the casing 1 and the lower end of the partition wall 1b. In this way, the water flows upward in the drainage channel 13 and is discharged from the discharge port 3 on one end side.

  In the fifth embodiment, the casing 1 itself has a regular quadrangular prismatic box shape as in the second embodiment, except that the introduction port 3 is a pair of opposing squares formed by the cross section of the casing 1. Is formed at the upper end portion of the inner wall 1a on the corner portion side opposite to the escape flow path 5 of the activated carbon cartridge 4 located on the most end side (upper end side) of the casing 1. On the other hand, on the other end side (lower end side) of the casing 1, the inner wall on the corner side opposite to the escape flow path 5 of the lowermost activated carbon cartridge 4 below the lower surface of the lowermost activated carbon cartridge 4. A drain pipe 14 is connected to 1a (the inner wall 1a facing the inner wall 1a where the introduction port 2 is formed).

  The drain pipe 14 communicates with the inside of the casing 1, extends from the other end side of the casing 1 toward one end side (upper end side), and then laterally extends at substantially the same height as the inlet 2. The drain pipe 14 is made into a drainage channel 13, and the opening on one end side thereof is used as an outlet 3 for filtered raw water W. Accordingly, the raw water W introduced into the casing 1 from the inlet 2 is filtered by the activated carbon cartridge 4 while flowing downward in the casing 1 as in the second embodiment, and the drain pipe 14 from the other end side. It is guided to the upper end side, that is, one end side through the inner drainage channel 13 and discharged from the discharge port 3.

  In the fourth and fifth embodiments configured as described above, the introduction port 2 and the discharge port 3 of the raw water W can be disposed at substantially the same position in the flow direction F. For example, as shown in FIG. As in the embodiment of the filtration device of the present invention, when a plurality of the filtration units of the present invention are configured by connecting the introduction port 2 and the discharge port 3 to each other, the filtration unit is in the above-described flow direction in the entire device. It can avoid extending toward F in order, and a compact filter device can be provided. In addition, in the filtration apparatus shown in FIG. 10, a configuration in which a plurality (three) of the filtration units of the fourth embodiment are connected, the introduction port 2 and the discharge port 3 are connected, and the casings 1 are also in close contact with each other. It is said that.

  And in the filtration apparatus comprised in this way, the raw | natural water W which was introduced and filtered into the 1st filtration unit (left side filtration unit in FIG. 10) is 2nd from the discharge port 3 via the drainage channel 13. The raw water W introduced into the filtration unit (the central filtration unit in FIG. 10) and further filtered in the second filtration unit is again passed through the drainage passage 13 from the outlet 3 to the third filtration unit (FIG. In FIG. 10, the water is introduced into the right filtration unit) and filtered, so that the raw water W having high turbidity can be sufficiently filtered to be clarified. Of course, a plurality of the filtration units of the fifth embodiment shown in FIGS. 8 and 9 may be configured such that the inlet 2 and the outlet 3 are connected to each other.

It is a perspective view which shows 1st Embodiment of the filtration unit of this invention. It is a sectional side view of the embodiment shown in FIG. It is a perspective view which shows 2nd Embodiment of the filtration unit of this invention. FIG. 4 is a side sectional view of the embodiment shown in FIG. 3. It is a sectional side view which shows 3rd Embodiment of the filtration unit of this invention. It is a perspective view which shows 4th Embodiment of the filtration unit of this invention. It is a sectional side view of embodiment shown in FIG. It is a perspective view which shows 5th Embodiment of the filtration unit of this invention. It is a sectional side view of the embodiment shown in FIG. It is side sectional drawing which shows one Embodiment of the filtration apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Casing 1a Inner wall of casing 1 1b Partition wall 2 Inlet port 3 Outlet port 4 Activated carbon cartridge 5 Escape channel 11 Cleaning means 12 Discharge pipe 13 Drainage channel 14 Drainage pipe W Raw water F Flow direction of raw water W

Claims (7)

  A casing in which the raw water introduced into the inside from the inlet on one end side is circulated toward the other end and discharged from the outlet, and a plurality of gaps are provided in the casing toward the direction of flow of the raw water. And an activated carbon cartridge for filtering the raw water, and the raw water flows between the activated carbon cartridge or between the activated carbon cartridge and the inner wall of the casing without passing through the activated carbon cartridge. The filtration unit characterized in that the escape passage to be provided is provided in a cross-section orthogonal to the flow direction with a smaller plane area than the activated carbon cartridge.   The escape passage is located between the activated carbon cartridges adjacent to each other in the flow direction of the raw water, and is located on the side away from each other in the casing when viewed along the flow direction. Item 2. The filtration unit according to Item 1.   2. The activated carbon cartridge is disposed with a gap between the activated carbon cartridge and an inner wall of the casing, and the gap is used as the escape passage. Item 3. The filtration unit according to Item 2.   3. The activated carbon cartridge according to claim 1, wherein the activated carbon cartridge is disposed so as to be in close contact with an inner wall of the casing, and the escape passage is formed so as to penetrate the activated carbon cartridge. Filtration unit.   A cleaning means for cleaning the activated carbon cartridge is provided, and a discharge pipe for a cleaning waste liquid for cleaning the activated carbon cartridge is disposed at an upper position of each stage of the activated carbon cartridge. The filtration unit according to any one of claims 1 to 4.   The casing is provided with a drain passage through which the raw water filtered by the activated carbon cartridge is introduced so as to extend from the other end side toward one end side, and the discharge port is provided at one end side of the casing. The filtration unit according to any one of claims 1 to 5, wherein the filtration unit is provided.   A filtration device comprising a plurality of the filtration units according to any one of claims 1 to 6, wherein the introduction port and the discharge port are connected to each other.

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