JP5967816B2 - Filter element and backwash-type filtration apparatus equipped with the filter element - Google Patents

Description

  The present invention relates to a filter element and a backwashing type filtration apparatus including the filter element.

  2. Description of the Related Art Backwashing type filtration devices that have been used on ships such as container ships have been proposed. Here, with reference to FIG. 6, the configuration of the conventional backwashing type filtration apparatus will be briefly described.

  As shown in the figure, the backwash type filtration apparatus Z includes a cylindrical filter housing 110 (hereinafter simply referred to as “housing”) 110 having two sealing covers 112 and 114. The housing 110 is provided with a filtration device inlet 118 through which a fluid to be filtered flows in and a filtration device outlet 120 through which the filtered fluid is discharged. A plurality of filter elements 122 are mounted inside the housing 110. Specifically, a plurality of filter elements 122 are arranged inside the housing 110 at intervals along a cylindrical (concentric) arc of the housing 110.

  The filter element 122 includes a filter medium 122a formed in a hollow cylindrical shape, one end of which is inserted into a through hole 114a formed in the sealing cover 114, and the other end is a sealing cap attached to the sealing cover 112. 126 is connected and sealed. In addition, the filter element 122 has a filter inlet 124 that is open at one end, and fluid flows into and out of the filter element 122 via the filter inlet 124. ing.

  Then, the fluid flowing in from the filter inlet 118 flows into the filter medium 122a from the filter inlet 124 of the filter element 122, and then is filtered by passing from the inner side to the outer side of the filter medium 122a and discharged from the filter outlet 120. It has come to be. In addition, the arrow 121 in the figure indicates the flow direction of the fluid during the filter operation.

  Further, the backwash type filtration device Z is provided with a drive rod (center rotating shaft) 134 and a backwash arm 130 connected to the drive rod 134. With this configuration, while performing filtration, The filter element 122 can be cleaned.

  The backwash arm (backwash pipe) 130 has an upper end abutted against the lower surface of the sealing cover 114 and a lower end connected to a pipe 132 connected to a fluid outlet for sewage. Further, the backwash arm 130 is moved under the filter inlet 124 of the filter element 122 through the drive rod 134 in order. Specifically, the backwash arm 130 operates in accordance with the rotation of the drive rod 134 and is sequentially connected to any one of the plurality of filter elements 122. Only the filter element 122 connected to the backwash arm 130 allows the fluid filtered by the other filter elements 122 to flow from the outside to the inside of the filter medium 122a. Thereby, the filter element 122 is backwashed. The direction of backwashing is the direction indicated by the arrow 135b in the figure (the direction from the outside to the inside of the filter element 122), and the normal filtration direction is the direction indicated by the arrow 135a (from the inside to the outside of the filter element 122). Direction). In addition, the backwashing type | mold filtration apparatus which performs the backwash process similar to the above is disclosed by patent document 1, for example.

JP 2001-170416 A

  However, because of the structure of the filter element, the above-described conventional backwash type filtration device cannot sufficiently remove deposits such as dust adhering to the “filter material” constituting the filter element even if backwashing is performed. However, there is a technical problem that deposits remain and accumulate on the filter medium, and the filtration flow rate decreases. That is, the above-described conventional backwashing type filtration apparatus has been unable to efficiently filter a fluid because the filtration flow rate decreases as it is used (because the filtration capacity decreases).

  Specifically, as shown in FIGS. 7 (a) and 7 (b), the backwashing type filtration device of the prior art allows the fluid to pass through the filter medium 122a constituting the filter element 122 and filters the fluid. Deposits d such as dust adhere to 122a. When the filter element 122 to which dust or the like is attached is backwashed, the adhering matter d captured by the filter medium 122a of the filter element 122 is washed away as shown in FIG.

However, since the filter element 122 according to the prior art has a structure in which the end opposite to the filter inlet 124 (the sealing cap 126 side at the upper end of the filter medium 122a) is closed, the filter element 122 is being backwashed. A large flow of water does not occur from the upper end of the filter medium 122a toward the filter inlet 124. Therefore, in the prior art, the adhering matter d such as dust adhering to the side surface of the filter medium 122a of the filter element 122 cannot be sufficiently washed out even by backwashing (see reference numeral 140 in FIG. 8B).
Moreover, since the upper end part of the filter element 122 is blocked, the flow rate on the upper end part side of the filter medium 122a during backwashing is small (at the upper end side of the filter medium 122a). The flow rate of the water flow becomes slower). Therefore, in the prior art, the adhering substance d adhering to the “upper end side of the filter medium 122a” away from the filter inlet 124 cannot be washed away sufficiently when backwashing is performed (see reference numeral 141 in FIG. 8B). reference)

  Thus, the backwashing type filtration apparatus Z of the prior art is used for the filter medium 122a (the side surface of the filter medium 122a or the upper end side of the filter medium 122a) constituting the filter element 122 when used for a predetermined period due to the structure of the filter element 122. Deposits d such as dust accumulate, and the filtration flow rate decreases. In the above-described backwashing type filtration device of the prior art, the filter element 122 can be frequently replaced to prevent a reduction in filtration capacity. However, this method increases the operation cost.

  This invention is made | formed in view of the said subject, The objective is to provide the backwashing type | mold filtration apparatus provided with the filter element which can suppress the fall of the filtration flow rate, and the said filter element.

The present invention made to solve the above-mentioned problems is a filter element that is attached to a backwash type filtration device and filters the fluid flowing in the device, and is formed in a hollow cylindrical shape that penetrates both ends. An upper lid that closes the upper end of the filter medium, a guide rod that is attached to the upper cover and extends from the upper end of the filter medium toward the lower end in the cylinder of the filter medium, and an upper hole that penetrates the upper cover If, e Bei a valve body for opening and closing the on hole moves along the guide rod by the pressure from the guide bar is slidably supported in and the fluid flowing through the tube of the filter medium, the fluid When filtering, a fluid is allowed to flow from a filter inlet formed at the lower end portion of the filter medium, and the valve body is urged to the upper end portion of the filter medium by the inflowing fluid and comes into contact with the upper lid portion. To close the upper hole When the fluid flowing into the cylinder is filtered through the filter medium and the filter medium is backwashed, a backwash arm provided in the backwash type filtration device is connected to the filter inlet. When the backflow arm stops connecting the fluid from the filter inlet, the fluid flowing outside the filter element passes through the filter medium and flows into the filter medium cylinder, and The fluid flowing through the upper hole flows into the filter medium cylinder to urge the valve body toward the lower end of the filter medium, thereby separating the valve body from the upper lid and opening the upper hole. The fluid flows from the opened upper hole toward the filter inlet, and the adhering matter adhering to the filter medium is washed away .

As described above, the filter element of the present invention is slidably supported by the upper lid portion that closes the upper end portion of the filter medium, the guide rod attached to the upper lid portion, the upper hole formed in the upper lid portion, and the guide rod. And a valve body that opens and closes the upper hole is employed. With this configuration, when the filter element is backwashed, the valve inlet and the backwash arm are connected (connected) to stop the inflow of fluid from the filter inlet, thereby closing the upper hole of the upper lid Can be urged by the fluid flowing in from the outside of the filter element, and the valve body can be separated from the upper lid portion and the upper hole can be opened (that is, opposite to the filter inlet when backwashing). The upper lid can be opened). Therefore, during backwashing, it is possible to generate a water flow that flows from the upper end of the filter medium toward the filter inlet, and as a result, it is possible to wash away the deposits adhering to the side surfaces of the filter medium. In addition, since the upper lid is opened during backwashing, a large flow is generated also on the upper end side of the filter medium, and dust adhering to the "upper end side of the filter medium" that is away from the filter inlet is removed. Can be washed away sufficiently.
Therefore, according to this invention, compared with the above-mentioned prior art, the washing | cleaning effect (cleaning effect by backwashing) of the deposit | attachment adhering to the filter medium which comprises a filter element can be improved, and the fall of the filtration flow rate by use is reduced. It is suppressed.
In the filter element of the present invention, when the fluid is filtered, the valve body is urged toward the upper end portion by the fluid flowing in from the filter inlet to close the upper hole of the upper lid portion. The same filtration process is performed.

  Moreover, the present invention enhances the cleaning effect of the deposits adhering to the filter medium by providing the “upper hole, guide rod and valve body in the upper lid”. That is, according to the present invention, it is not necessary to newly provide an external power source or a control circuit in order to operate the above-described configuration (upper hole, guide rod, and valve body) that enhances the cleaning effect. The filter element which can suppress the fall of the filtration flow volume without being realized.

Further, it is desirable that the guide shaft is provided with an urging means that abuts the lower end portion of the valve body and urges the valve body toward the upper lid portion.
With this configuration, when backwashing is not performed, the upper hole can be closed by biasing the valve body to the upper lid portion more reliably.

In addition, the present invention is applied to a backwash type filtration device that includes a substantially hollow cylindrical housing that houses a plurality of filter elements, and that sequentially cleans the filter elements while filtering the fluid flowing in from the outside. The
The backwashing type filtration device includes a shelf board that divides the interior of the housing into two areas, an upper area and a lower area, and a fluid that is to be filtered is formed in the lower area. A device inlet for inflow, a device outlet formed on the upper side of the housing part and for discharging the filtered fluid from the upper area, a rotary shaft disposed in the center of the housing and formed to be rotatable, A backwash arm that is connected to the rotating shaft and operates in accordance with the rotation of the rotating shaft, and the filter element includes a filter medium that is formed in a hollow cylindrical shape with both ends penetrating, and an upper end portion of the filter medium An upper lid that closes the upper lid, a guide rod that is attached to the upper lid and extends from the upper end to the lower end of the filter medium in the cylinder of the filter medium, an upper hole that penetrates the upper cover, and the guide A valve body that is slidably supported by the rod and moves along the guide rod by pressure from a fluid flowing in the filter medium, and opens and closes the upper hole. Through-holes, the lower end of the filter element is fitted and fixed to each through-hole, and the lower area of the housing communicates with the inside of the filter medium. The arm moves so that one end thereof is in contact with the lower end surface of the shelf plate, is connected to one of the plurality of through holes, and communicates with the filter element inserted and fixed in the connected through hole. In the filter element that is not in communication with the backwash arm, the fluid that flows in from the apparatus inlet flows into the filter medium cylinder through the through hole. When fluid flows into the valve body, the valve body The fluid is urged toward the upper end portion of the filter medium and abuts on the upper lid portion to close the upper hole, and the fluid that has flowed in passes through the filter medium and is filtered. The filter element that is discharged from the outlet of the apparatus and communicates with the backwash arm has fluid that flows outside the filter element and in the upper area passing through the filter medium and passing through the filter medium. And the fluid flowing through the upper area flows into the cylinder of the filter medium from the upper hole and directs the valve body toward the lower end of the filter medium. The valve body is urged away from the upper lid portion to open the upper hole, and the fluid adhering to the filter inlet is washed away by the fluid flowing from the opened upper hole toward the filter inlet. This is And features.

  As described above, according to the present invention, compared with the above-described prior art, the cleaning effect of the deposits adhering to the filter medium of the filter element (cleaning effect by backwashing) can be enhanced, so that the filtration flow rate is reduced due to use. It is possible to provide a backwash type filtration device that can be suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, the backwashing type | mold filtration apparatus provided with the filter element which can suppress the fall of a filtration flow rate, and the said filter element can be provided.

It is the schematic diagram which showed the whole structure of the backwashing type | mold filtration apparatus provided with the filter element of this embodiment. It is a top view of the shelf board of the backwashing type | mold filtration apparatus of this embodiment. It is a component expanded view of the filter element of this embodiment. It is a schematic diagram for demonstrating the filtration process by the filter element of this embodiment. It is a schematic diagram for demonstrating the backwashing process by the filter element of this embodiment. It is the schematic diagram which showed the backwashing type | mold filtration apparatus provided with the filter element of the prior art. It is a schematic diagram for demonstrating the filtration process by the filter element of a prior art. It is a schematic diagram for demonstrating the backwashing process by the filter element of a prior art.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a filter element according to an embodiment of the present invention and a backwashing type filtration apparatus including the filter element will be described based on the drawings.

  First, the structure of the backwashing type filtration apparatus provided with the filter element of this embodiment is demonstrated based on FIG.1 and FIG.2. In addition, FIG. 1 is the schematic diagram which showed the whole structure of the backwashing type | mold filtration apparatus provided with the filter element of this embodiment. Moreover, FIG. 2 is a top view of the shelf board of the backwashing type filtration apparatus of this embodiment.

  As shown in FIG. 1, the backwashing type filtration apparatus W of the present embodiment includes a hollow cylindrical housing 1 in which a plurality of filter elements 10 are housed, while filtering the fluid flowing from the outside of the housing 1. The filter elements 10 are cleaned in order. Hereinafter, the structure of the backwashing type filtration apparatus W of this embodiment is demonstrated in order. In addition, since this embodiment has the characteristics in the structure of the filter element 10, the structure of the filter element 10 is demonstrated in detail and description of the other structure is simplified.

  The housing 1 includes a hollow cylindrical main body 1a having an open upper end and a bottom 1a1, and a dome-shaped lid 1b that closes the upper end of the main body 1a. Further, the housing 1 is provided with a shelf 7 inside, and the inside of the housing 1 is partitioned into an entrance side area (lower area) A1 and an exit side area (upper area) A2 by the shelf board 7. . Further, the main body 1a is formed with a device inlet 4 for allowing a fluid to flow into the inlet-side area A1 on the side surface on the lower end side. Further, the main body 1a is formed with a device outlet 5 on the side surface on the upper end side for discharging the fluid filtered from the outlet side area A2.

Further, as shown in FIG. 2, the shelf board 7 is formed in a disk shape, and a through hole 7a into which the rotary shaft 8 is rotatably inserted is formed at the center thereof. Further, the shelf plate 7 is formed with a plurality of through holes 7b1 and 7b2 on a concentric circle centering on the through hole 7a (the plurality of through holes 7b1 and 7b2 are formed at predetermined intervals). . In the illustrated example, through holes 7b1 and 7b2 are formed in two concentric circles (inner circle and outer circle) having different radii, respectively. And the lower end part of the filter element 10 is airtightly fitted and fixed to each through-hole 7b1 and 7b2, and thereby, the plurality of filter elements 10 are supported and fixed to the shelf plate 7. With this configuration, the inlet-side area A1 of the housing 1 communicates with the inside of the filter element 10 (filter medium 11). If the fluid flowing into the housing 1 does not pass through the tube of the filter element 10 (filter medium 11), the fluid flows from the inlet side area A1 (or outlet side area A2) to the outlet side area A2 (or inlet side area A1). It cannot be moved.
In the example shown in the figure, eight filter elements 10 are fitted and fixed in the through holes 7b1 formed on the inner circle of the shelf board 7, and the through holes 7b2 formed on the outer circle of the shelf board 7 are used. Sixteen filter elements 10 are fitted and fixed to each other.

  A rotation shaft 8 extending from the top of the lid 1b toward the shelf plate 7 is provided at the center of the housing 1. One end (upper end) of the rotary shaft 8 is connected to a motor 9 attached to the upper end of the lid 1 and is rotated by driving of the motor 9. The other end (lower end) of the rotary shaft 8 is inserted through the through hole 7a of the shelf board 7 and protrudes to the entrance side area A1. The motor 9 is driven by being controlled by a control circuit (not shown).

A backwash arm (backwash pipe) 20 (20a, 20b, 20c, 20d) is connected to the lower end portion of the rotating shaft 8 extending to the entrance side area A1 of the housing 1. The backwash arm 20 is formed integrally with a base portion 20a in which a vertical tube 20b, which will be described later , is fixed to the lower end portion of the rotary shaft 8, and the upper end surface of the backwash arm 20 together with the rotary shaft 8 while sealing the lower surface of the shelf 7 in a watertight manner. It is designed to rotate.

Specifically, the backwash arm 20 includes a base portion 20a, a vertical tube 20b connected to the base portion 20a, and two L-shaped tubes 20c and 20d connected to a side surface portion of the vertical tube 20b. The vertical pipe 20b is rotatably fitted to a discharge pipe 30 whose upper end is sealed by a base 20a and whose lower end communicates with the backwash liquid discharge port 40.
The L-shaped tube 20c is connected to the side surface of the vertical tube 20b and communicates with the vertical tube 20 at one end, and the upper end surface formed at the other end is in contact with the lower surface of the shelf board 7. . The length of the L-shaped tube 20c is designed so that the upper end surface rotates along a plurality of through holes 7b1 formed on the shelf board 7.
The L-shaped tube 20d has one end connected to the side surface of the vertical tube 20b and communicates with the vertical tube 20b, and the upper end surface formed at the other end is in contact with the lower surface of the shelf board 7. . The length of the L-shaped tube 20d is designed so that the upper end surface rotates along a plurality of through holes 7b2 formed in the shelf plate 7.

The backwash arm 20 operates in accordance with the rotation of the rotating shaft 8 rotated by the motor 9, and the upper end surfaces of the L-shaped tubes 20c and 20d are in close contact with the lower surface of the shelf plate 7, and the lower end portion of the filter element 10 is It arrange | positions in the position which agree | coincides with the through-holes 7b1 and 7b2 currently fitted and fixed. As a result, the backwash arm 20 has the upper end surfaces of the L-shaped tubes 20c and 20d rotated intermittently (or continuously) while sealing the shelf 7, and the filter inlet 19 at the lower end portion of the filter element 10 in sequence. Communicate with.

Specifically, the L-shaped tube 20c is operated by the motor 9 that is controlled by a control circuit (not shown), and the upper end surface thereof is connected to one of the plurality of through holes 7b1 formed in the shelf plate 7. The Thereby, the L secondary pipe 20c is connected to the filter element 10 fitted and fixed to the through hole 7b1 via the connected through hole 7b1 (the L-shaped pipe 20c and the hollow cylindrical shape are formed). The inside of the cylinder of the filter medium 11 communicates).
Further, the L-shaped tube 20d is operated by the motor 9 operated under the control of the control circuit, and the upper end surface thereof is connected to one of the plurality of through holes 7b2 formed in the shelf board 7. Thus, L-shaped tube 20d via the through hole 7b2 which is the connection, and the through hole 7b2 to connect the filter element 10 which is fitted and fixed (L-shaped tube 20d, which is formed in a hollow cylindrical shape The inside of the cylinder of the filter medium 11 communicates).

The filter element 10 includes a filter medium 11 formed in a hollow cylindrical shape penetrating both ends, a plate-like upper lid portion 12 that closes the upper end portion of the filter medium 11, and a tube of the filter medium 11 that is attached to the upper lid portion 12. A guide rod 13 extending from the upper end to the lower end of the filter medium 11, a plurality of upper holes 12 a penetrating the upper lid portion 12, and a valve body 14 slidably supported by the guide rod 13 and opening and closing the upper hole 12 a. And have. The guide bar 13 extends from the upper lid portion 12 (the upper end of the filter medium 11) to the vicinity of the lower end of the filter medium 11, and a fitting fitting 15 that fits into the through holes 7b1 and 7b2 of the shelf board 7 is attached to the lower end of the guide bar 13. It has been.

  Moreover, the filter medium 11 should just be a thing which allows a fluid to pass through and can be backwashed, and the specific structure is not specifically limited. For example, the filter medium 11 may be formed by winding a wire mesh or a notch wire around a cylindrical frame (filter frame) to form a hollow cylinder. Hereinafter, an example in which the filter medium 11 is formed by winding a notch wire around the frame will be described in detail, and each configuration of the filter element 10 will be described in detail. FIG. 3 is a component development view of the filter element of the present embodiment.

In the example shown in FIG. 3, the filter medium 11 constituting the filter element 10 is formed in a cylindrical shape by winding a notch wire nw spirally around a metal frame f such as stainless steel. The frame body f is a rod-shaped member disposed between a circular upper ring member fa having both sides penetrated, a circular lower ring member fb having both sides penetrated, and the upper ring member fa and the lower ring member fb. Wire support material fc. Specifically, in the frame body f, the upper ring member fa and the lower ring member fb are arranged at a predetermined interval (arranged to face each other), and the upper ring member fa and the lower ring member fb are arranged. a plurality of wire support members fc arranged circumferentially at predetermined intervals, it is formed by the ends of each wire support fc sticking to the upper ring member f a and the lower ring member f b respectively between The
And the cylindrical filter medium 11 comes to be formed by winding the notch wire nw around the wire support material fc arranged on the circumference of the frame f in a spiral manner and laminating them. Yes.

Moreover, the upper cover part 12 which covers the upper end part of the filter medium 11 is formed in the substantially disc shape, and the guide rod 13 has penetrated the center part. The guide bar 13 is fixed to and supported by the upper lid portion 12.
Specifically, the diameter of the upper lid portion 12 is approximately the same as the outer diameter of the upper ring member fa, and is fixed to the upper surface of the upper ring member fa. Thereby, the upper end of the cylindrical filter medium 11 is closed by the upper lid 12. In addition, the lower end of the filter medium 11 is opened and serves as a filter inlet 19 (see FIGS. 4 and 5) through which fluid passes.

Moreover, the guide bar 13 is comprised by the whole screw, for example. In the illustrated example, the upper part of the guide bar 13 protrudes from the upper lid part 12, and the guide bar 13 is fixed to the upper lid part 12 by screwing a nut 18 into the protruding guide bar 13.
Further, the upper lid portion 12 has a plurality of upper holes 12a penetrating through the upper and lower surfaces thereof. When the upper hole 12a backwashes the filter element 10, a fluid is passed into the tube of the filter medium 11. It becomes a flow path to let through. The upper cover 12 and the guide bar 13 are made of a metal such as stainless steel.

  Further, a valve body 14 made of synthetic resin or the like is inserted into the guide rod 13. For example, the valve body 14 is formed in an inverted truncated cone shape having a flat upper end surface, and is disposed on the lower surface side of the upper lid portion 12, and functions as an on-off valve that opens and closes the upper hole 12 a of the upper lid portion 12. To do. Specifically, the valve body 14 is slidably moved along the guide rod 13 by the pressure from the fluid flowing in the cylinder of the filter medium 11. And the valve body 14 closes the upper hole 12a of the upper cover part 12 by the upper end part contacting the lower surface of the upper cover part 12 by the pressure from the fluid, or the upper end part is separated from the upper cover part 12. The upper hole 12a of the upper lid portion 12 is opened.

  Further, a stopper member 17 that restricts the movement of the valve body 14 in the lower end direction is attached to the guide rod 13. The stopper member 17 is constituted by a ring-shaped member having a through hole into which the guide rod 13 is inserted, and has a predetermined length dimension from the lower end surface of the valve body 14 in contact with the upper lid portion 12. Located on the lower side. Further, a biasing means 16 is sandwiched between the lower end surface of the valve body 14 and the upper end surface of the stopper member 17, and the valve body 14 is biased toward the upper lid portion 12 by the biasing means 16. Has been. The configuration of the urging means 16 is not particularly limited, but is formed by, for example, a coil spring. As described above, the fitting 15 that fits into the through holes 7b1 and 7b2 of the shelf board 7 is attached to the lower end side of the guide bar 13 (not shown in FIG. 3). For example, as shown in FIG. 1, the fitting 15 is composed of a plurality of leg pieces that extend radially around the guide bar 13 at the lower end of the guide bar 13. The leg pieces are fitted into the through holes 7 b 1 and 7 b 2, and the through holes 7 b 1 and 7 b 2 are fixed to the guide rod 13.

Moreover, the shape of the valve body 14 shown in FIG.1 and FIG.3 is only an example to the last. The valve body 14 should just be the shape which can close the upper hole 12a of the upper cover part 12 watertightly, when the upper end side is the state contact | abutted with the lower end side of the upper cover part 12. FIG. For example, the upper end portion of the valve body 14 may not be a flat shape, but may be formed in a shape (spherical, a shape in which the upper end side is tapered, etc.) that fits into the upper hole 12a of the upper lid portion 12. For example, the opening of the upper hole 12a of the upper lid 12 may be formed in a tapered shape, and the upper end side of the valve body 14 may be formed in a tapered shape that fits into the upper hole 12a.
Further, the mounting position of the stopper member 17 is set to a position that does not inhibit the flow of appropriately designed by (the fluid taking into account the flow of fluid coming flows into the upper hole 12 a Kararozai 11 of the upper cover portion 12 )

Next, operation | movement of the filter element 10 of this embodiment is demonstrated.
First, operation | movement of the filter element 10 at the time of performing a filtration process is demonstrated using FIG. 1 and FIG. 4 mentioned above. FIG. 4 is a schematic diagram for explaining the filtration process by the filter element of the present embodiment, and (a) is a schematic diagram showing the filter element and the fluid immediately after the filtration process is started. ) Is a schematic diagram showing the filter element and the fluid in a state where a predetermined time has passed since the filtration process was started. Moreover, in FIG. 4, the figure is simplified for convenience of explanation.

  The filter element 10 is configured to perform a filtration process when the backwash arm 20 is not connected to the filter inlet 19 formed at the lower end thereof. In the example shown in FIG. 1, the filter element 10 b and the filter element 10 d are not connected to the backwash arm 20, and thus filter the fluid.

  Specifically, the filter element 10 includes a fluid (filtered object (attachment) d such as dust) flowing in from the apparatus inlet 4 when the filter inlet 19 and the backwash arm 20 are not connected. Fluid) flows from the filter inlet 19 into the cylinder of the filter medium 11. When the fluid flows into the cylinder of the filter medium 11 from the filter inlet 19, the valve body 14 is urged toward the upper lid portion 12 by the inflowing fluid. Thereby, the upper end part of the valve body 14 contacts the lower surface of the upper cover part 12, and the upper hole 12a is closed (refer Fig.4 (a)). In the filtration process, since the state where the fluid flows in from the filter inlet 19 continues, the upper end portion of the valve body 14 comes into contact with the upper lid portion 12 while being urged. As a result, the valve body 14 closes the upper hole 12a of the upper lid 12 in a watertight manner.

Then, the fluid that has flowed into the inner cylinder of the filter medium 11 passes from the inside of the filter medium 11 to the outside and flows out of the filter element 10. At this time, the filtering object d such as dust contained in the fluid is captured by the filter medium 10, and dust and the like are removed from the fluid that has passed through the filter element 10 (see FIG. 4B)). The filtered fluid that has passed through the filter element 10 flows through the outlet side area A2 and is discharged from the apparatus outlet 5.
Thus, in this embodiment, is provided with the upper hole 12a in the lid portion 12 on closing the upper end of the filter element 10, when the filtration step, the valve body 14, since the upper hole 12a is closed in a watertight manner The filtration performance similar to that of the filter element of the prior art is realized.

  Next, operation | movement of the filter element 10 at the time of performing a backwash process is demonstrated using FIG. 1 and FIG. 5 mentioned above. FIG. 5 is a schematic diagram for explaining the back washing process of the filter element of the present embodiment, and (a) is a schematic diagram showing the filter element and the fluid immediately after the back washing process is started, (B) is a schematic diagram showing the filter element and fluid in a state in which a predetermined time has elapsed since the start of backwashing treatment, and (c) is again subjected to filtration treatment after washing away dust by backwashing treatment. It is the schematic diagram which showed the state which started. Further, in FIG. 5, as in FIG. 4, the diagram is simplified for convenience of explanation.

  The filter element 10 is configured to perform a backwash process when the backwash arm 20 is connected to a filter inlet 19 formed at the lower end thereof. In the example shown in FIG. 1, the filter element 10 a and the filter element 10 c are backwashed with the filter medium 11 connected to the backwash arm 20. In FIGS. 5A and 5B, the backwash arm 20 communicating with the filter inlet 19 is omitted.

  In the filter element 10, when the backwash arm 20 is connected to the filter inlet 19 formed at the lower end portion through the through holes 7 b 1 and 7 b 2 of the shelf plate 7, the filter inlet 19 is blocked by the backwash arm 20. The fluid flows into the filter inlet 19 and stops. When the inflow of the fluid to the filter inlet 19 stops, the fluid flowing outside the filter element 10 (fluid flowing in the outlet side area A2) flows into the cylinder of the filter medium 11 (FIG. 1, (See FIGS. 5A and 5B).

Specifically, the fluid flowing in the outlet side area A2 and flowing outside the filter element 10 passes through the filter medium 11 constituting the side surface of the filter element 10 and flows into the cylinder of the filter medium 11. Come on. Thereby, the adhering matter (filter target) d captured between the filter media 11 is washed away.
In addition, the fluid flowing in the outlet side area A2 flows into the cylinder of the filter medium 11 from the upper hole 12a of the upper lid 12 and urges the valve body 14 toward the filter inlet 19 (the lower end of the filter medium 11). . By this urging, the valve element 14 that has been in contact with the lower surface of the upper lid portion 12 is separated from the upper lid portion 12 to open the upper hole 12a, and fluid flows into the filter medium cylinder from the opened upper hole 12a. Come on. That is, when the upper hole 12a of the upper lid 12 is opened, fluid flows from the upper lid 12 toward the filter inlet 19, and the adhering matter (filtering object) d adhering to the side surface of the filter medium 11 is washed away. It is. Further, when the fluid flows from the upper lid portion 12 toward the filter inlet 19, the adhering matter (filter target) d adhering between the filter media above the filter media is washed away.

  When the fluid is filtered again by the filter element 10 after the back washing process shown in FIGS. 5 (a) and 5 (b), the attachment captured by the filter medium 11 as shown in FIG. 5 (c). Since the kimono (object to be filtered) d is in a state of being washed away, the desired filtration capacity is maintained.

  As described above, the filter element 10 according to the present embodiment includes an upper lid portion 12 that closes the upper end of the filter medium 11, a guide bar 13 that is attached to the upper lid portion 12, an upper hole 12 a that is formed in the upper lid portion 12, and a guide. The structure which provides the valve body 14 which is supported by the stick | rod 13 slidably and opens and closes the upper hole 12a is employ | adopted.

  With this configuration, in the present embodiment, when the filter element 10 is backwashed, the backwash arm 20 is connected to the filter inlet 19 to stop the flow of fluid from the filter inlet 19, so that the upper hole 12 a of the upper lid portion 12. The valve body 14 that is closed can be urged by the fluid flowing in from the outside of the filter element 10 to be separated from the upper lid portion 12 to open the upper hole 12a. As a result, during backwashing, a large flow of water can be generated from the upper end of the filter medium 11 toward the filter inlet 19. Thereby, according to this embodiment, the deposit | attachment (filtration target object) d adhering to the side surface of the filter medium 11 can be washed away. In addition, when the backwashing is performed, the upper lid portion 12 is opened, so that a large flow also occurs on the upper end side of the filter medium 11, and the “upper end side of the filter medium 11” that is away from the filter inlet 19. The adhering deposit (filtering target) d can be sufficiently washed away.

  Therefore, according to this embodiment, compared with the above-mentioned prior art, the cleaning effect of the adhering substance d adhering to the filter element 10 (the cleaning effect by backwashing) can be enhanced, and the decrease in the filtration flow rate due to use is suppressed. The

  Further, in this embodiment, the upper lid portion 12 is provided with “the upper hole 12a, the guide rod 13 and the valve body 14” (the number of parts is small and the complicated control is not required), so that the filtration flow rate is reduced. Is suppressed. That is, in the present embodiment, it is not necessary to newly provide an external power source or a control circuit in order to operate the above-described configuration (the upper hole 12a, the guide rod 13 and the valve body 14) that enhances the cleaning effect. The filter element 10 that can suppress the decrease in the filtration flow rate without increasing the cost is realized.

  In the present embodiment, the guide shaft 13 is provided with a biasing means 16 that biases the valve body 14 toward the upper lid portion 12. With this configuration, when backwashing is not performed, the upper hole 12a can be closed more securely by bringing the valve body 14 into close contact with the upper lid 12. As a result, the fluid is prevented from flowing out of the filter element 10 without passing through the filter medium 11 in the filtration step.

  As described above, according to the present embodiment, it is possible to provide the filter element 10 and the backwashing type filtration device W that can suppress a decrease in the filtration flow rate.

  In addition, this invention is not limited to embodiment mentioned above, A various change is possible within the range of the summary.

  For example, in the above-described embodiment, the case where the filter element 10 is fitted and fixed to the through holes 7b1 and 7b2 of the shelf board 7 by the fitting 15 formed at the lower end of the guide bar 13 is shown. It is just an example. The filter element 10 only needs to have its lower end fitted and fixed in the through holes 7b1 and 7b2, and the specific fixing method is not particularly limited. Further, when the filter element 10 is not fixed by the fitting 15, the guide bar 13 does not need to be extended to the vicinity of the lower end of the filter medium 11. In this case, the guide rod 13 only needs to be formed by “a length dimension necessary for opening / closing the upper hole 12 a by the valve body 14 (movement length dimension of the valve body 14)”. For example, as illustrated in FIG. 5, the guide bar 13 may be formed by “the moving length dimension of the valve body 14” from the upper lid portion 12 (the upper end of the filter medium 11) downward.

In the above-described embodiment, the urging means 16 that urges the valve element 14 is provided in the filter element 10, but the urging means 16 may be omitted.
Moreover, although the case where the filter element 10 was formed in the cylindrical shape was shown, it is not limited to this in particular. The shape of the filter element 10 is appropriately designed.

  Moreover, in embodiment mentioned above, although the example in which the valve body 14 was formed with the synthetic resin was shown, it is only an example to the last. The valve body 14 is formed of any material as long as the valve body 14 is configured to receive water pressure from the fluid and move slidably along the guide rod 13 to open and close the upper hole 12a of the upper lid portion 12. It may be done.

W ... Backwash type filtration device 1 ... Housing 1a ... Main body (housing)
1a1 ... Bottom (housing)
1b: Lid (housing)
4 ... Device inlet (housing)
5 ... Device outlet (housing)

7 ... Shelves 7a ... through holes 7b1, 7b2 ... through holes 8 ... rotary shaft 9 ... motor

10: Filter element 11: Filter medium (filter element)
12 ... Upper lid (filter element)
12a ... Upper hole (filter element)
13 ... Guide rod (filter element)
14 ... Valve (filter element)
15 ... Fitting fitting (filter element)
16 ... Biasing means (filter element)
17 ... Stopper member (filter element)
18 ... Nut (filter element)
19: Filter inlet (filter element)
f ... Frame (filter element)
fa: Upper ring member (frame (filter element))
fb: Lower ring member (frame body (filter element))
fc ... Wire support material (frame (filter element))

20 ... Backwash arm 20a ... Base (backwash arm)
20b ... Vertical pipe (backwash arm)
20c, 20d ... L-shaped tube (backwash arm)

30 ... Drain pipe 40 ... Backwash outlet

Claims (3)

A filter element that is attached to a backwash type filtration device and filters the fluid flowing in the device,
A filter medium formed in a hollow cylindrical shape with both ends penetrating;
An upper lid for closing the upper end of the filter medium;
A guide bar attached to the upper lid and extending from the upper end of the filter medium toward the lower end in the cylinder of the filter medium;
An upper hole penetrating the upper lid,
A valve body that is slidably supported by the guide rod and moves along the guide rod by pressure from a fluid flowing in the filter medium to open and close the upper hole ,
When the fluid is filtered, the fluid is allowed to flow from a filter inlet formed at the lower end portion of the filter medium, and the valve body is urged to the upper end portion of the filter medium by the flowing fluid, and the upper lid portion And the fluid that has flowed into the cylinder is filtered through the filter medium,
When the filter medium is backwashed, a backwash arm provided in the backwash type filtration device is connected to the filter inlet, and the connection of the backwash arm allows fluid from the filter inlet to flow. When the inflow stops, the fluid flowing outside the filter element passes through the filter medium and flows into the filter medium cylinder, and the fluid flowing outside the filter element enters the filter medium cylinder from the upper hole. Inflowing and urging the valve body toward the lower end portion of the filter medium separates the valve body from the upper lid portion, opens the upper hole, and fluid flows from the opened upper hole toward the filter inlet. A filter element characterized in that it adheres to the filter medium and flows away . 2. The filter element according to claim 1 , wherein the guide shaft is provided with an urging unit that abuts on a lower end portion of the valve body and urges the valve body toward the upper lid portion. . A backwashing type filtration device comprising a substantially hollow cylindrical housing containing a plurality of filter elements, and sequentially washing the filter elements while filtering the fluid flowing in from the outside,
A shelf that partitions the interior of the housing into two areas, an upper area and a lower area;
A device inlet formed on the lower side of the housing and for allowing a fluid to be filtered to flow into the lower area;
A device outlet formed on the upper side of the housing and for discharging the filtered fluid from the upper area;
A rotating shaft disposed in the center of the housing and formed to be rotatable;
A backwashing arm connected to the rotating shaft and operating in accordance with the rotation of the rotating shaft;
The filter element includes a filter medium formed in a hollow cylindrical shape penetrating both ends, an upper lid part that closes an upper end part of the filter medium, and an upper end part of the filter medium that is attached to the upper cover part and in the filter medium cylinder A guide rod extending from the upper end toward the lower end, an upper hole penetrating the upper lid portion, and slidably supported by the guide rod, and along the guide rod by pressure from a fluid flowing in the cylinder of the filter medium A valve body that moves to open and close the upper hole,
A plurality of through holes are formed in the shelf plate, and the lower end portion of the filter element is fitted and fixed to each through hole, and the lower area of the housing communicates with the inside of the filter medium. And
The backwashing arm moves while its one end abuts against the lower end surface of the shelf plate, and is connected to any of the plurality of through holes, and a filter element inserted and fixed to the connected through holes; Communicated,
The filter element that is not in communication with the backwash arm is configured such that fluid flowing from the apparatus inlet flows into the filter medium cylinder through the through hole, and the fluid flows into the cylinder. Then, the valve body is urged toward the upper end portion of the filter medium by the inflowing fluid and abuts on the upper lid portion to close the upper hole, and the inflowing fluid passes through the filter medium and the fluid flows. Filtered, this filtered fluid is discharged from the outlet of the device,
In the filter element communicating with the backwash arm, the fluid flowing outside the filter element and in the upper area passes through the filter medium and flows into the cylinder of the filter medium and flows to the backwash arm. And the fluid flowing through the upper area flows into the filter medium cylinder from the upper hole and urges the valve body toward the lower end of the filter medium from the upper lid. The valve body is separated, the upper hole is opened, and the adhering matter adhering to the filter medium is washed away by fluid flowing from the opened upper hole toward the filter inlet. Backwash type filtration device.

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