JP6928635B2 - Filtration device and filter cleaning method for filtration device - Google Patents

Description

The present invention relates to a filtration device that filters a fluid using a filter. Specifically, the filtration device and a filtration device that can remove deposits on the inside of the filter medium and the surface of the filtrate chamber side of the filter generated by backwashing or the like without removing the filter. The present invention relates to a filter cleaning method of a filtration device.

Conventionally, filtration of seawater, lake water, river water, water supply, sewerage, etc., filtration of liquids commonly used in industry such as cooling water of various devices or process liquids, filtration of gases of various raw materials used in chemical factories, etc. In the above, various filtration devices are used for the purpose of capturing and removing fine particles and dust contained therein.

When filtration by the filtration device is continued for a long period of time, solids and gel-like dust trapped in the filter medium accumulate in the filter medium, and the resistance to the fluid passing through the filter medium increases, and finally the target is targeted. It becomes difficult to filter the fluid. In order to deal with this, for example, an operation called "backwashing" is performed in which a fluid is passed through the filter medium in the direction opposite to that at the time of filtration to peel off the traps adhering to the filter medium, and the filtration performance of the filter medium is restored. This "backwashing" method is a method that can easily reduce the passage resistance of the filter medium and bring it closer to the initial passage resistance without disassembling the filter medium. In particular, a filtration device provided with a backwash fluid discharge pipe is excellent in that backwash can be performed without interrupting filtration.

As a filtration device capable of such "backwashing", a cylindrical filtration element is built in a cylindrical strainer (casing) body having an inlet and an outlet, and a fluid passes from the inside to the outside of the filtration element. In a filtration device for filtering, a suction pipe having a foreign matter suction mechanism (suction head) with a brush is rotatably provided in the filtration element, and a discharge pipe (backwash fluid) is provided in the suction pipe via a communication mechanism. There is a filtration device in which a discharge pipe) is connected (see, for example, Patent Document 1).

In addition, a filtration device that allows fluid to pass from the inside to the outside of a cylindrical filter element to perform filtration, in which a backwash nozzle that communicates with a low-pressure discharge port is arranged inside the filter element. The nozzle can backwash the filter element by scanning the inner peripheral surface of the filter element and allowing fluid to flow from the outside of the filter element through the filter element into the nozzle and discharged from the discharge port. (See, for example, Patent Document 2).

Japanese Unexamined Patent Publication No. 2012-16672 Japanese Patent Application Laid-Open No. 2008-507391

Like each of the above filtration devices, when "backwashing" in which the fluid is passed through the filter medium in the opposite direction to that during filtration, especially backwashing using a suction head with a brush, the surface of the filter on the stock solution chamber side is performed. Although the trapped material adhering to the filter medium can be removed, it may be difficult to remove the adhering matter inside the filter medium or on the surface of the filtrate chamber side. Such deposits on the inside of the filter medium or on the surface of the filtrate chamber side may be generated, for example, when fine particles get stuck in the gaps of the mesh during filtration or fibrous substances are entangled with the mesh. In addition, fine particles and the like contained in the filtered fluid used for backwashing are trapped and adhered to the surface of the filter on the filtrate chamber side and the inside of the filter medium when passing from the filtrate chamber side to the stock solution chamber side during backwashing. May be done. This is the opposite even if it passes through the filtered fluid, depending on the orientation of the fine particles and fibers when passing through, such as fine particles with a size close to the eyes of the filter medium, elongated fine particles, and fibrous ones. This is because some particles are captured without passing through during washing.

In the conventional filter medium, for example, as shown in FIG. 7, a fine mesh for filtration, an intermediate mesh for dispersion of flow and intermediate reinforcement, a thick and coarse mesh for reinforcement, and the like are arranged from the stock solution chamber side. It may have a multi-layer structure. When such a filter is backwashed, some of the fine particles and the like contained in the filtered fluid passing from the filtrate chamber side to the stock solution chamber side are captured at the interface between the fine mesh and the intermediate mesh inside the filter medium. May occur. Some of the captured fine particles can be removed by the flow of fluid from the stock solution chamber side to the filtrate chamber side during normal filtration, but some of them may get stuck or stick between both meshes. be. Adhesions such as fine particles clogged from the filtrate chamber side of such a filter cannot be removed by a fluid flow from the filtrate chamber side to the stock solution chamber side by further backwashing or by rubbing a brush from the stock solution chamber side. It is difficult, and there is a problem that the accumulation of deposits causes an increase in the passage resistance of the fluid. In order to deal with this problem, it has conventionally been necessary to periodically remove and clean the filter to remove deposits inside the filter medium of such a filter and on the surface of the filtrate chamber side.

The present invention addresses such a problem, and provides a filter cleaning method for a filtration device and a filtration device, which can remove deposits on the inside of the filter medium and the surface of the filtrate chamber side of the filter generated by backwashing or the like without removing the filter. Its purpose is to provide.

In order to solve the above-mentioned problems, the filtration device according to the present invention has a fluid inlet and a fluid outlet, and is internally communicated with the fluid inlet to accommodate the fluid before filtration, and after filtration communicated with the fluid outlet. A casing provided with a filtrate chamber for accommodating the fluid of the above, and a filter installed inside the casing for passing the fluid from the stock solution chamber side to the filtrate chamber side and filtering the fluid, and the fluid is filtered in the filtrate chamber. In a filtration device capable of backwashing that allows the backwash to pass from the side to the stock solution chamber side and peel off the traps adhering to the filter, the backwashing means for performing the backwashing and the undiluted solution chamber side to the filtrate chamber side. The backwashing means includes a high-pressure cleaning mechanism that injects a high-pressure fluid so as to pass through the filter and removes deposits on the inside of the filter and the surface of the filtrate chamber side by high-pressure cleaning, and the backwashing means is the undiluted solution chamber. A backwash head that is arranged so as to contact a part of the filter from the side and allows the fluid in the filtrate chamber to pass through the filter and sucks the backwash head, and a contact surface that moves the contact surface position of the backwash head with respect to the filter. The position moving means, the backwash fluid discharge pipe that discharges the fluid sucked by the backwash head to the outside of the casing, and the portion of the backwash head that contacts a part of the filter are provided on the filter. It is configured to include a removal brush planted around a slit-shaped suction hole covering the entire length of the filter medium, and after the backwash is performed, the high pressure cleaning is performed by the high pressure cleaning mechanism. ..

Further, the filter cleaning method of the filtration device according to the present invention has a fluid inlet and a fluid outlet, and internally communicates with the fluid inlet to accommodate the fluid before filtration and the undiluted solution chamber and the fluid after filtration communicates with the fluid outlet. A casing provided with a filtrate chamber for accommodating the filtrate, and a filter installed inside the casing for passing fluid from the stock solution chamber side to the filtrate chamber side to filter the fluid from the filtrate chamber side. It is a filter cleaning method for cleaning the filter of a filtration device capable of backwashing by passing it to the stock solution chamber side and peeling off traps adhering to the filter. The backwashing is the filter from the stock solution chamber side. The backwash head arranged so as to contact a part of the filter chamber allows the fluid in the filtrate chamber to pass through the filter and is sucked, and the contact surface position of the backwash head with respect to the filter is moved by the contact surface position moving means. , The fluid sucked into the backwash head is discharged to the outside of the casing by the backwash fluid discharge pipe, and is provided at a portion of the backwash head in contact with a part of the filter, and the entire length of the filter medium of the filter is adjusted. When the filter medium of the filter is backwashed using a removal brush planted around the slit-shaped suction hole to be covered, the removal brush is used to scrape the trapped material, and the entire surface of the filter medium is covered. Therefore, the traps adhering to the surface of the filter on the stock solution chamber side are removed, and after the backwash is performed, the deposits on the inside of the filter and the surface of the filtrate chamber side are removed on the stock solution chamber side. This is performed by high-pressure washing in which a high-pressure fluid is sprayed from the filter chamber side to the filtrate chamber side so as to pass through the filter.

According to the filtration device of the present invention, the fluid is filtered by passing through the filter from the undiluted solution chamber side to the filtrate chamber side, and the fluid is passed from the filtrate chamber side to the undiluted solution chamber side to adhere to the filter. In the filter device capable of backwashing, a high-pressure washing mechanism that injects a high-pressure fluid so as to pass through the filter from the undiluted solution chamber side to the filtrate chamber side is provided, so that the inside of the filter medium of the filter generated by backwashing or the like is provided. And the deposits on the surface of the filtrate chamber side can be removed by high-pressure washing without removing the filter.

According to the filter cleaning method of the filtration device of the present invention, the traps adhering to the surface of the filter on the undiluted solution chamber side are removed by backwashing, and high-pressure cleaning is performed by injecting a high-pressure fluid from the undiluted solution chamber side. Therefore, the deposits on the inside of the filter medium of the filter and on the surface of the filtrate chamber side generated by backwashing or the like can be removed by high-pressure washing without removing the filter element.

It is explanatory drawing which shows the whole structure of the 1st Embodiment of the filtration apparatus by this invention, (a) is a cross-sectional view, (b) is a vertical cross-sectional view. It is a vertical cross-sectional view which shows an example of the high pressure cleaning mechanism of the filtration apparatus of FIG. It is explanatory drawing which shows the piping example at the time of arranging a plurality of filtration devices of FIG. It is explanatory drawing which shows the whole structure of the 2nd Embodiment of the filtration apparatus by this invention, (a) is a cross-sectional view, (b) is a vertical cross-sectional view. It is explanatory drawing which shows the whole structure of the 3rd Embodiment of the filtration apparatus by this invention, (a) is a cross-sectional view, (b) is a vertical cross-sectional view. It is a vertical sectional view which shows the whole structure of the 4th Embodiment of the filtration apparatus by this invention. It is sectional drawing which shows an example of the filter medium structure of a filter.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[First Embodiment]
FIG. 1 is an explanatory diagram showing an overall configuration of a first embodiment of the filtration device according to the present invention. (A) is a sectional view taken along line BB of (b), and (b) is a sectional view taken along line AA of (a). This filtration device, for example, filters the ballast water of a ship by allowing the fluid to pass through the filter from the fluid inlet and flow out from the fluid outlet to perform filtration, and to perform filtration without using a backwash head or the like, which will be described later. The flow path of the fluid is switched by the piping system, and the fluid is backwashed by flowing the fluid from the fluid outlet through the filter to the fluid inlet. This filtration device includes a casing 1, a partition wall 2, a filter element 3, and further includes a high-pressure cleaning mechanism 5.

The casing 1 forms the outer shell of the filtration device, and includes a casing main body 1a and a casing lid 1b. The casing body 1a is formed in a bottomed tubular shape (for example, a cylindrical shape), a rectangular parallelepiped shape, or the like, and has, for example, a fluid inlet 6 in which a fluid flows in from the outside in the upper part of the side wall, and a fluid filtered inside in the lower part of the side wall. It has a fluid outlet 7 that flows out to the outside. The casing lid 1b is a lid that is placed on the casing main body 1a and seals the inside of the casing 1. The lid 1b is provided with a through hole 1c for installing the high-pressure cleaning mechanism 5, which is sealed by a small flange 57 described later. The material of the casing 1 is metal, synthetic resin, or the like, and the shape and size thereof may be appropriately determined according to the purpose of use of the filtration device, the type and amount of fluid to be passed through, the installation location, and the like.

A partition wall 2 is horizontally provided at the lower part inside the casing 1. The partition wall 2 communicates with the fluid inlet 6 inside the casing 1 to accommodate the unfiltered fluid chamber 8 (upper side), and communicates with the fluid outlet 7 to accommodate the filtered fluid (upper side). It is a wall that separates it from the lower side). A through hole is provided in the central portion of the partition wall 2, and a tubular portion 10 is projected upward by fitting into the through hole.

A cylindrical filter element 3 is provided in the stock solution chamber 8 in the vertical direction on the upper side of the partition wall 2 inside the casing 1, and the lower end portion thereof penetrates the tubular portion 10 and can rotate. It is held in a cylindrical portion 10 and communicates with the stock solution chamber 8 via the inside of the tubular portion 10. The filter element 3 serves as a filter for passing a fluid from the stock solution chamber side to the filtrate chamber side to filter the filter, and has a filter medium 31 forming a cylindrical surface, a lower closing plate 32 forming the lower end portion, and an upper end thereof. It has an upper closing plate 33 forming a portion, and allows a target fluid to pass through a filter medium 31 from the outside to the inside to capture and filter solids and gel-like dust contained in the fluid. ..

Similar to the conventional filter medium shown in FIG. 7, the filter medium 31 may be one as long as it is stacked in a plurality of layers and the outermost layer has the finest mesh. For example, a plurality of laminated wire meshes are sintered and held. There are those made of improved shape and formed into a cylindrical shape and sintered, those made of a cylindrical notch wire, those made of a wedge wire, and the like. In the case of a sintered product, the mesh size of the innermost layer may be selected from 10 to 200 μm, and the mesh size of the inner layer may be appropriately selected from 200 to 5000 μm. In this case, the reinforcing mesh and the protective mesh other than the outermost layer are related to the strength of the filter element 3, and the number of layers, the size of the mesh, and the wire diameter are selected so that the required strength can be obtained. Further, as the weaving method of the mesh, plain weave, twill weave, satin weave, tatami weave, twill weave and the like can be applied. The innermost layer is a wire mesh, and the outermost layer is sintered with, for example, a cylindrical punching plate having innumerable square holes and a reinforcing member in which a plurality of thin rods are arranged in the vertical and horizontal directions. You may.

The lower closing plate 32 has a disk shape, and the outer circumference is fitted to and fixed to the cylindrical filter medium 31, and a through hole 34 is provided in the central portion thereof. The shaped portion 10 is rotatably fitted. A groove is provided on the inner circumference of the through hole 34, and an O-ring 12 is provided to form a seal between the inner circumference and the outer circumference of the tubular portion 10. A bearing 11 is provided between the lower surface of the lower closing plate 32 and the upper surface of the partition wall 2 to support the weight of the filter element 3 and rotatably hold it.

On the other hand, the upper closing plate 33 also has a disk shape, and the outer circumference is fitted to and fixed to the tubular filter medium 31. The central portion of the upper closing plate 33 is connected to a rotating shaft 14 extending from a geared motor 13 provided on the upper side of the casing lid 1b through a through hole 1d of the casing lid 1b. As a result, the filter element 3 can be rotated by the geared motor 13. A bearing 15 is also provided between the upper surface of the upper closing plate 33 and the lower surface of the casing lid 1b, and an O-ring 16 is provided on the inner circumference of the through hole 1d to be between the rotating shaft 14. Forming a seal.

Here, in the present invention, the high pressure cleaning mechanism 5 is provided inside the filtrate chamber 9. The high-pressure washing mechanism 5 injects a high-pressure fluid from the stock solution chamber 8 side so as to pass through the filter medium 31, and communicates with the inside of the filter medium 31 and the surface of the filtrate chamber 9 side, that is, the inside side of the filter element 3 communicating with the filtrate chamber 9. The deposits on the surface are removed by high-pressure washing. In this embodiment, a fluid (clean water) pressurized by a high-pressure pump or the like is injected from two nozzles 53a and 53b provided on the stock solution chamber side. The nozzles 53a and 53b are reciprocated in the direction parallel to the axis of the cylindrical filter element 3 so that the fluid can be injected with respect to the entire length of the filter medium 31. As in the case of backwashing, the entire surface of the filter medium 31 can be washed with high pressure by injecting fluid while rotating the filter element 3 with the geared motor 13.

As shown in FIG. 2, the high-pressure cleaning mechanism 5 has an inner pipe 51, a moving cylinder 52, two nozzles 53a and 53b, and two fluid supply passages 54a and 54b.

The inner pipe 51 is a tubular member, and includes guide portions 51a and 51b on both sides in the length direction and a piston portion 51c projecting in a disk shape at the center. The lower end of the lower guide portion 51b is detachably fitted and fixed to a seat 56 provided on the upper surface of the partition wall 2. Further, a disk-shaped small flange 57 is fitted on the outer periphery of the upper guide portion 51a near the upper end portion, and the small flange 57 is fixed to the upper surface of the casing lid 1b so as to cover the through hole 1c, whereby high pressure is applied. The entire cleaning mechanism 5 is fixed to the casing 1. With this structure, the entire high-pressure cleaning mechanism 5 can be attached to and detached from the casing 1 through the through hole 1c without disassembling the casing 1. Both ends of the inner pipe 51 are sealed, and the inside is hollow to accommodate two fluid supply passages 54a and 54b.

The moving cylinder 52 is fitted to the outer circumference of the piston portion 51c, and the outer circumferences of the guide portions 51a and 51b are fitted to the through holes formed in the closed portions by closing both ends thereof. It is provided so as to be movable in the axial direction of the inner pipe 51. Each of these fitting portions is sealed with an O-ring or the like, and fluid chambers 55a and 55b communicating with the respective fluid supply paths 54a and 54b are formed on both sides of the piston portion 51c inside the moving cylinder 52. ..

Two nozzles 53a and 53b that communicate with the fluid chambers 55a and 55b are attached to both ends of the moving cylinder 52.

The two fluid supply passages 54a and 54b are provided so as to communicate with the fluid chambers 55a and 55b from the outside through the inside of the inner pipe 51. For example a fluid, such as clean water pressurizing pump pressure pressurized in the like (P _H) is the three-way valve V _H at controlled two fluid supply paths 54a, it is alternately supplied to the 54b, the fluid chambers 55a, 55b The fluid is injected from the nozzles 53a and 53b attached to the moving cylinder 52 while moving the moving cylinder 52 upward and downward, respectively. The pipeline resistance of the fluid supply passages 54a and 54b is set to be sufficiently lower than the pipeline resistance of the nozzles 53a and 53b.

This high-pressure washing can be performed in a state where the fluid in the filtration device, particularly in the stock solution chamber 8, is drained so that the injection speed is not reduced. If the position of the fluid inlet 6 is high as shown in FIG. 1, the fluid in the stock solution chamber 8 may not be completely drained from the fluid inlet 6, so the high-pressure washing discharge port for discharging the fluid in the stock solution chamber 8 to the outside of the filtration device. 17 is provided near the lower end of the stock solution chamber 8 of the casing main body 1a. An on-off valve (high-pressure washing / discharging valve _VE ) is also provided in the high-pressure washing / discharging port 17, and the valve is opened only during high-pressure washing. In the present embodiment, this valve _VE is a manual valve, but it may be an automatic valve. However, as will be described later, high-pressure washing can be performed without draining the fluid in the undiluted solution chamber 8. In that case, or when the position of the fluid inlet 6 is low, the high-pressure washing discharge port 17 or the high-pressure washing discharge valve _VE Is not always necessary.

Further, in the present embodiment, the nozzles 53a and 53b of the high-pressure cleaning mechanism 5 are provided so as to inject the fluid obliquely with respect to the surface of the filter medium 31 on the stock solution chamber 8 side in a top view (FIG. 1 (a). )reference). This is because when the fluid is injected vertically, the deposits remaining on the surface of the filter medium 31 on the stock solution chamber 8 side may be pushed into the filter medium 31 to cause clogging. Therefore, the fluid is jetted diagonally to the surface of the filter medium 31 on the stock solution chamber 8 side, and a part of the fluid does not pass through the filter medium 31 but becomes a jet along the surface, so that the filter medium 31 is on the stock solution chamber side. I also try to remove the deposits on the surface of the. As a result, while avoiding the problem that the deposits are pushed into the filter medium 31 by the fluid injection and cause clogging, the jet fluid passing through the filter medium 31 removes the deposits inside the filter medium 31 and on the surface on the filtrate chamber 9 side. Can be removed. When fluid injection is performed while rotating the filter element 3 as in the present embodiment, it is preferable that the fluid injection direction is tilted so as to be a "head wind" with respect to the movement direction of the surface of the filter medium 31 due to rotation (FIG. 1 (a)). Since the injected fluid usually spreads in a conical shape from the nozzles 53a and 53b, this causes the deposits on the surface of the rotating filter medium 31 portion on the stock solution chamber 8 side to be first removed at a shallow angle (slightly inside the tangent to the cylindrical surface). (Direction) is removed with the injection fluid, and then the injection fluid at a larger angle is passed through the filter medium 31 portion having no deposit on the surface, and the inside of the filter medium 31 or the filtrate chamber 39 side, that is, the inside of the filter element 3 is passed. This is because the deposits on the side surface can be removed.

However, the nozzles 53a and 53b may be provided so as to inject the fluid perpendicularly to the surface of the filter medium 31, and the surface of the filter medium 31 is particularly clean when the surface of the filter medium 31 on the stock solution chamber 8 side is sufficiently clean. It may be better to inject the fluid perpendicular to.

The distance between the filter medium 31 and the nozzles 53a and 53b, the pressure of the high-pressure cleaning fluid, and the injection shape are appropriately set according to the properties of the filter medium to be cleaned and the like. Generally, the higher the pressure of the high-pressure washing fluid is set, the higher the effect of removing traps becomes, but if it is too high, the filter medium may be damaged or a large pressure pump may be required, which is not preferable. As the pressure of the high-pressure washing fluid supplied to the high-pressure washing mechanism 5, when the filter medium obtained by sintering a plurality of wire nets laminated by the filtering device of the present embodiment is washed with high pressure, the fluid (seawater) in the undiluted solution chamber 8 is removed for washing. 5~150kg / cm ² if you, preferably when cleaning not remove the fluid 10 to 100 kg / cm ^2, the stock solution chamber 8 is 10 to 200 / cm ^2, preferably set to 20~150kg / cm ² ..

Filtration device as an external piping system be filtered fluid connection to the the fluid inlet 6 of the casing 1, it is connected to the inlet side branch pipe 21, while branch 21a is closed the inlet side valve V _I midway Then, it is connected to the stock solution supply source having the primary pressure (P ₁ ), and the other branch 21b is connected to the drain side _{which has a drain valve V B in the} middle and is opened to the atmospheric pressure (P _{0), for example.} ing. On the other hand, the fluid outlet 7 of the casing 1 is connected outlet pipe 22, the outlet pipe 22 has an outlet-side valve V _O in the middle, the filtrate storage tank having a secondary pressure (P ₂₎ Etc. are connected. Accordingly, opening the inlet-side valve V _I and the outlet valve V _O, to close the drain valve V _B, the fluid was closed and filtered state to flow from the fluid inlet 6 to the fluid outlet 7, an inlet-side valve V _I , The outlet side valve _VO and the drain valve V _B can be opened to switch between backwashing in which the fluid flows back from the fluid outlet 7 to the fluid inlet 6.

FIG. 3 shows an example of piping when a plurality of filtration devices are provided in parallel. In this case, the one branch 21a of each filtration device merges and is connected to the fluid supply source, and the other branch 21b Are merged and connected to the drain, and the outlet side pipe 22 is merged and connected to the filtrate storage tank or the like. The outlet-side pipe 22 before merging is provided with a line pressure adjusting mechanism for backwashing (not shown). By opening and closing the inlet side valve _{VI1 to 3} , outlet side valves _{VO1 to 3} and drain valve _VB1 to 3 of each filtration device, the operation of each filtration device (filtration, backwash, high pressure wash) can be switched individually. It is designed to be used.

Next, the operation of the filtration device of the first embodiment configured as described above will be described with reference to FIG. The rotation of the filter element 3 is stopped during both filtration and backwashing.

During filtration, the inlet-side valve V _I and the outlet valve V _O of the filter is opened, the drain valve V _B is closed. The pressure of the fluid on the inlet side (primary pressure P ₁ ) is pressurized by a pump (centrifugal pump, etc.) and is higher than _{the pressure on the outlet side (secondary pressure P 2).} As shown by the solid line arrow, the fluid flows into the stock solution chamber 8 of the casing 1 from the fluid inlet 6, passes through the cylindrical filter medium 31, and flows into the inside of the filter element 3 communicating with the filtrate chamber 9. It is filtered. The fluid that has passed through the filter medium 31 and is filtered flows out from the filtrate chamber 9 through the fluid outlet 7.

During backwashing, the inlet-side valve V _I of the filtering device is closed, the outlet-side valve V _O and the drain valve VB is opened. As a result, the fluid inlet 6 of the filtration device is communicated _{with the low pressure side opened to the atmospheric pressure P 0} through the drain pipe, and the pressure drops, which is lower than _{the pressure (secondary pressure P 2} ) of the fluid outlet 7 of the filtration device. Therefore, as shown by the white arrow, the fluid passes through the filtrate chamber 9 and the filter element 3 from the fluid outlet 7, passes through the stock solution chamber 8, and flows back to the fluid inlet 6. The backwash flow passing through the filter element 3 backwashes the entire surface of the filter medium 31. The backwash is performed at a predetermined frequency and for a predetermined time according to the usage conditions of the filtration device (filtration rate, amount of foreign matter in the fluid, pressure loss, etc.).

It is effective to perform high-pressure washing after performing backwashing to remove traps on the surface of the filter medium 31 on the stock solution chamber side. This is because the problem of pushing the trapped material on the surface of the filter medium 31 on the stock solution chamber 8 side into the inside of the filter medium 31 and causing clogging during high-pressure washing can be reduced. The high-pressure washing can be performed without draining the fluid of the filtration device, or can be performed with the fluid of the filtration device drained. That is, when high-pressure washing is performed without draining the fluid, it can be performed during normal filtration, so that downtime of the device can be reduced. On the other hand, when the filtration operation is stopped and the fluid of the filtration device is drained, the injection speed is not reduced and the cleaning effect can be enhanced. Incidentally, the pull fluid filtration device, closes the inlet-side valve V _I and the outlet valve V _O, undiluted open to filtering device pressure washing discharge valve V _{E (and} not shown in Eabe cement valve) The fluid in the chamber 8 is discharged.

In either case, the high-pressure cleaning mechanism 5 is operated to inject the fluid (clean water) from the two nozzles 53a and 53b provided on the stock solution chamber 8 side so as to pass through the filter medium 31 of the filter element 3. During the injection, the nozzles 53a and 53b are reciprocated in the direction parallel to the axis of the cylindrical filter element 3 to perform fluid injection on the entire length of the filter medium 31. The entire surface of the filter medium 31 is washed with high pressure by injecting fluid while rotating the filter element 3 with the geared motor 13. As described above, in the present embodiment, the fluid injection direction is tilted so as to be a "head wind" with respect to the movement direction of the surface of the filter medium 31 due to rotation (see FIG. 1 (a)). Since the injected fluid spreads in a conical shape from the nozzles 53a and 53b, the deposits on the surface of the rotating filter medium 31 portion on the stock solution chamber 8 side are first removed with the jet fluid at a shallow angle, and then An injection fluid at a larger angle is passed through the filter medium 31 portion having no deposits on the surface to remove deposits on the surface inside the filter medium 31 or on the filtrate chamber 9 side, that is, on the inner side of the filter element 3.

The reciprocating movement and the operation of the fluid injection will be specifically described with reference to FIG. First closes the port of the fluid supply channel 54b side of the three-way valve V _H, to open the port of the fluid supply passage 54a side. Then, the fluid pressure (P _H) is supplied to the upper fluid chamber 55a through the fluid supply passage 54a, the mobile cylinder 52 a pressure of the fluid at the same time injected from the nozzle 53a moves upward. Further, since the volume of the lower fluid chamber 55b is reduced by this, the fluid in the lower fluid chamber 55b is also injected from the nozzle 53b communicating with the lower fluid chamber 55b. FIG. 2 shows this state. When the moving cylinder 52 reaches the upper end of the movable range, the three-way valve _VH is switched to close the port on the fluid supply path 54a side and open the port on the fluid supply path 54b side. Then, the fluid is supplied to the lower fluid chamber 55b through the fluid supply path 54b and injected from the nozzle 53b, and at the same time, the moving cylinder 52 moves downward due to the pressure of the fluid. Further, since the volume of the upper fluid chamber 55a is reduced by this, the fluid in the upper fluid chamber 55a is also injected from the nozzle 53a communicating with the upper fluid chamber 55a. In this way, the fluid can be injected while reciprocating the position of the moving cylinder 52.

As described above, the line resistance of the fluid supply paths 54a and 54b is sufficiently lower than the line resistance of the nozzles 53a and 53b. Therefore, when the moving cylinder 52 shown in FIG. 2 rises, the pressure of the upper fluid chamber 55a to which the fluid is supplied is applied. becomes substantially supply pressure P _H, because the balance of vertical force to the moving cylinder 52, the pressure of the pressure in the lower fluid chamber 55b also becomes substantially P _H. Accordingly, unless the supply pressure P _H is constant, the injection flow rate of the fluid from the nozzles 53a, 53b is constant. When the injection flow rate of the fluid from the lower nozzle 53b is constant, the volume reduction rate of the lower fluid chamber 55b is constant, and the moving speed of the moving cylinder 52 is also constant (thus, the moving speed of the injection position is also constant). become. Similarly, when the moving cylinder 52 is lowered, the injection flow rate of the fluid from the nozzles 53a and 53b becomes constant, and the moving speed of the moving cylinder 52 also becomes constant.

High-pressure washing is also performed at a predetermined frequency for a predetermined time according to the usage conditions of the filtration device (filtration rate, amount of foreign matter in the fluid, frequency of backwashing, pressure loss, etc.). However, the frequency of high pressure washing may be much lower than the frequency of backwashing.

The high-pressure cleaning mechanism 5 may be any mechanism as long as it can move the entire range of the filter medium 31 of the filter element 3 and inject a fluid at a predetermined pressure, in addition to the above configuration. For example, the nozzle position may be moved by using a drive source separate from the injection fluid, such as an air cylinder, a hydraulic cylinder, or a motor-driven feed screw mechanism.

Further, in the present embodiment, the high pressure cleaning mechanism 5 is always fixed in the filtration device, but as described above, the entire high pressure cleaning mechanism 5 can be attached to and detached from the casing 1 without disassembling the casing 1, so that maintenance can be performed. The high pressure cleaning mechanism 5 may be installed in the filtration device to perform high pressure cleaning only occasionally.

Further, as the fluid for high-pressure cleaning, clean water is used as described above in the present embodiment, but the present invention is not limited to this, and for example, a filtered fluid may be used. The fine particles removed by high-pressure washing flow into the filtrate chamber side together with the high-pressure washing fluid, but these particles were attached during backwashing after passing through the filter once, and there was an aid in high-pressure fluid injection. Since it has passed through the filter, there is usually no problem even if it is mixed with the filtrate after that.

According to the first embodiment, even in the case of a filtration device in which a fluid flows back from a fluid outlet 7 to a fluid inlet 6 to perform backwashing, the backwashing is performed by injecting fluid from the stock solution chamber 8 side by the high pressure washing mechanism 5. The deposits on the inside of the filter medium 31 of the filter element 3 and on the surface of the filtrate chamber 9 side generated by the above can be removed without removing the filter element 3.

[Second Embodiment]
FIG. 4 is an explanatory diagram showing an overall configuration of a second embodiment of the filtration device according to the present invention.
(A) is a sectional view taken along line DD of (b), and (b) is a sectional view taken along line CC of (a). In the first embodiment, this filtration device uses a backwash mechanism including a backwash head arranged so as to contact a part of the filter as a backwash means, and has a strong suction force and a high backwash with a removal brush. It has an effect. Since this filtration device is the same as that of the first embodiment except for the backwashing means, the common elements are designated by the same reference numerals, and detailed description thereof will be omitted.

This filtration device includes a casing 1, a partition wall 2, a filter element 3, a backwash mechanism 104, and further includes a high pressure washing mechanism 5. Here, the casing 1, the partition wall 2, and the filter element 3 are the same as those in the first embodiment.

The backwash mechanism 104 is arranged so as to contact a part of the filter medium 31 of the filter element 3 from the stock solution chamber 8 side, and the fluid on the filtrate chamber 9 side is sucked through the filter medium 31 to suck the sucked fluid. The filter medium 31 is backwashed by discharging it to the outside of the casing 1, and includes a backwash head 141 and a backwash fluid discharge pipe 142. In the present specification, "suction" is not necessarily limited to drawing the fluid at a pressure lower than the atmospheric pressure, and generally means drawing the fluid to the side where the pressure is relatively low when there is a pressure difference. .. The backwashing mechanism 104 and the rotating mechanism of the filter element 3 including the geared motor 13 or the like as the contact surface position moving means constitute the backwashing means of the present embodiment. The backwash head 141 is arranged so as to be in contact with a part of the filter medium 31, and sucks the fluid on the filtrate chamber side through the filter medium 31. It is provided in contact with the outside and parallel to its axis. A slit-shaped suction hole 143 that covers substantially the entire length of the filter medium 31 is provided on the contact surface portion, and a removal brush 144 is planted around the slit-shaped suction hole 143. By backwashing the filter element 3 while rotating it with the geared motor 13, the entire surface of the filter medium 31 can be backwashed while scraping the trapped material with the removal brush 144.

The material of the brush bristles of the removal brush 144 is, for example, a natural or synthetic fiber, a metal wire such as steel, copper, or brass, and is selected according to the purpose of use of the filtration device and the fluid to be passed. Further, instead of the removal brush 144, a metal, resin or rubber scraper or the like formed in a blade shape or a spatula shape is provided around the suction hole 143 and is slidably contacted with the surface of the cylindrical filter medium 31. The trap may be removed.

On the other hand, in the vicinity of the lower end portion of the backwash head 141, the backwash fluid discharge pipe 142 is branched on the side opposite to the contact surface side with the filter medium 31. The backwash fluid discharge pipe 142 discharges the fluid sucked by the backwash head 141 to the outside of the casing 1. It is connected to the external discharge pipe 145 via. This discharge pipe 145, the opening and closing valve _{V F} are provided. The opening and closing valve V _F is for controlling the outflow and stopping of backwash fluid, is opened during backwashing of the filter, and is closed when otherwise. The discharge side of the opening and closing valve V _F is low than the pressure of the fluid outlet 7, for example, is connected to the atmospheric pressure P ₀ is open to the drain side.

The high-pressure washing mechanism 5 injects a fluid from the stock solution chamber side so as to pass through the filter, and removes deposits inside the filter and on the filtrate chamber side. Since the configuration is the same as that of the high-pressure cleaning mechanism 5 of the first embodiment, the description thereof will be omitted.

Filtration The external piping system be filtered fluid connected to the apparatus, the fluid inlet 6 of the casing 1, the inlet pipe 121 is connected, the inlet pipe 121, middle has an inlet side valve V _I It is connected to a stock solution source having a primary pressure (P _1). On the other hand, the fluid outlet 7 of the casing 1 is connected outlet pipe 122, the outlet pipe 122, an outlet-side valve V _O in the middle, the filtrate storage tank having a secondary pressure (P ₂₎ Etc. are connected. No other branch 21b and the drain valve V _B of the first embodiment, as instead described above is outside of the discharge pipe 145 to the backwash fluid discharge pipe 142 is connected, the exhaust extraction tube 145 off during valve a V _F, for example, is connected to the opened drain side to the atmospheric pressure (P _0).

The operation of the filtration device of the second embodiment configured as described above is basically the same as that of the first embodiment except at the time of backwashing.

That is, when filtered, the rotation of the filter element 3 is stopped, the inlet side valve V _I and the outlet valve V _O is opened, the opening and closing valve V _F of backwashing fluid discharge system is closed. The fluid to be filtered flows from the fluid inlet 6 into the stock solution chamber 8 of the casing 1 as shown by the solid arrow, passes through the portion of the cylindrical filter medium 31 where the backwash head 141 is not in contact, and is filtered. It is filtered by flowing into the inside of the element 3. The filtered fluid flows into the filtrate chamber 9, passes through the fluid outlet 7, and flows out as shown by arrow B.

During backwashing, the inlet side valve V _I and the outlet valve V _O together with is subsequently opened, the opening and closing valve V _F of the backwash fluid discharge system is opened, communicating via the backwash fluid discharge pipe 142 The pressure inside the backwash head 141 decreases, and the fluid inside the filter element 3 passes through the filter medium 31 and flows in from the suction hole 143 as shown by the white arrow. As a result, the linear portion of the filter medium 31 in contact with the suction hole 143 is backwashed. Further, since the rotation of the filter element 3 by the geared motor 13 is also started, the entire surface of the filter medium 31 is backwashed while scraping the trapped object with the removal brush 144. However, even during backwashing, the fluid to be filtered flows into the stock solution chamber 8 from the fluid inlet 6 as indicated by the solid arrow, so that the cylindrical filter medium 31 does not come into contact with the backwashing head 141. In the portion, filtration continues. The backwash is performed at a predetermined frequency and for a predetermined time according to the usage conditions of the filtration device (filtration rate, amount of foreign matter in the fluid, etc.).

Similar to the first embodiment, the high-pressure washing can be performed without draining the fluid of the filtration device, or can be performed with the fluid of the filtration device drained. That is, when high-pressure washing is performed without draining the fluid, it can be performed during normal filtration, so that downtime of the device can be reduced. In the case of the present embodiment, since the filtration is continued in the filter medium 31 portion that is not in contact with the backwash head 141 even during the backwash as described above, it is possible to perform high pressure washing during the backwash. On the other hand, when the filtration operation is stopped and the fluid of the filtration device is drained, the injection speed is not reduced and the cleaning effect can be enhanced. In either case, the high-pressure cleaning mechanism 5 is operated to inject the fluid (clean water) from the two nozzles 53a and 53b provided on the stock solution chamber 8 side so as to pass through the filter medium 31 of the filter element 3. During the injection, the nozzles 53a and 53b are reciprocated in the direction parallel to the axis of the cylindrical filter element to perform fluid injection on the entire length of the filter medium 31. The entire surface of the filter medium 31 is washed with high pressure by injecting fluid while rotating the filter element 3 with the geared motor 13.

According to the second embodiment, even in the case of a filtration device that performs backwashing using a backwash head 141 or the like, a filter generated by the backwashing or the like due to injection of fluid from the stock solution chamber 8 side by the high pressure washing mechanism 5. Adhesions inside the filter medium 31 of the element 3 and on the surface of the filtrate chamber 9 side can be removed without removing the filter element 3. In a filtration device that performs backwashing using a backwash head 141 or the like, the suction force during backwashing is large, and fine particles or the like may be easily clogged from the filtrate chamber 9 side of the filter medium 31 due to backwashing. High-pressure cleaning with is effective.

[Third Embodiment]
FIG. 5 is an explanatory diagram showing an overall configuration of a third embodiment of the filtration device according to the present invention. (A) is a sectional view taken along line FF of (b), and (b) is a sectional view taken along line EE of (a). In the second embodiment, this filtration device is a form in which four filter elements are arranged in parallel to increase the processing speed. Since the other configurations are the same as those of the second embodiment, detailed description thereof will be omitted. This filtration device also filters ballast water of a ship, for example, and includes a casing 201, a partition wall 202, a cylindrical filter element 203, a backwash mechanism 204, and a high-pressure washing mechanism 205.

The casing 201 and the partition wall 202 are basically the same as the casing 1 and the partition wall 2 of the first and second embodiments, respectively, but are configured to accommodate four filter elements 203. Each filter element 203 is the same as the filter element 3 of the first embodiment. The backwash mechanism 204 is the same as the backwash mechanism 104 of the second embodiment, but two are provided, and each backwash head 241 contacts two filter elements 203 and backwashes the filter medium 231 thereof. It is configured as follows. The high-pressure cleaning mechanism 205 is also the same as the high-pressure cleaning mechanism 5 of the second embodiment, but two are provided, and each high-pressure cleaning mechanism 205 has two sets of nozzles 253a and 253b provided in two directions and is close to each other. It is configured to inject a fluid onto the filter medium 231 of the two filter elements 203. Other than that, the configuration of the present filtration device is the same as that of the filtration device of the second embodiment.

The operation of the filtration device of the third embodiment configured as described above is basically the same as that of the second embodiment.
That is, at the time of filtration, as in the second embodiment, the fluid to be filtered flows from the fluid inlet 206 into the stock solution chamber 208 of the casing 201 as shown by the solid arrow, and is the reverse of each cylindrical filter medium 231. The washing head 241 passes through the non-contacting portion and flows into the inside of the filter element 203 to be filtered. The filtered fluid flows into the filtrate chamber 209 and flows out through the fluid outlet 207.

During backwashing, in the present embodiment, each backwash head 241 is in contact with the two filter elements 203, so that the fluid inside each filter element 203 passes through the filter medium 231 as shown by the white arrow. Then, it flows in from the suction hole 243 and is backwashed. Further, since each filter element 203 is rotated by the geared motor 213, the entire surface of the filter medium 231 is backwashed while scraping the trapped object with the removal brush 244. However, even during the backwash, the filtration is continued in the portion of the cylindrical filter medium 231 that is not in contact with the backwash head 241.

Similar to the first and second embodiments, the high-pressure washing can be performed during the filtration operation without draining the fluid of the filtration device, or can be performed with the fluid of the filtration device drained. As described above, in the present embodiment, two high-pressure cleaning mechanisms 205 are provided, and each high-pressure cleaning mechanism 205 has two sets of nozzles 253a and 253b provided in two directions, and the two filter elements 203 in close proximity to each other. It is configured to inject a fluid onto the filter medium 231. The high-pressure cleaning mechanism 205 is operated to inject fluid (clean water) from two nozzles 253a and 253b onto the filter medium 231 of each filter element 203, and the nozzles 253a and 253b are directed to the shaft of the cylindrical filter element 203. By reciprocating in the direction parallel to the above, fluid injection is performed on the entire length of the filter medium 231. As in the case of backwashing, the entire surface of the filter medium 231 is washed with high pressure by injecting fluid while rotating each filter element 203 with the geared motor 213.

In the high pressure cleaning mechanism 205, in order to maintain the injection speed, the nozzles 253a and 253b are provided in only one direction to perform high pressure cleaning of the filter medium 231 of one filter element 203, and after the completion, the directions of the nozzles 253a and 253b are changed. The filter medium 231 of the other filter element 203 may be washed with high pressure. Further, also in this embodiment, the high pressure cleaning mechanism 205 is always fixed in the filtration device, but one set of the high pressure cleaning mechanism 205 may be attached in the filtration device to perform high pressure cleaning only at the time of maintenance. This also applies to the devices of other embodiments. Further, the two backwashing mechanisms 204 and the two high-pressure washing mechanisms 205 may be operated at the same time or at different timings.

According to the third embodiment, even in a configuration in which a plurality of filter elements 203 are arranged in parallel to increase the processing speed, it is generated by backwashing or the like due to the injection of fluid from the stock solution chamber 208 side by the high pressure washing mechanism 205. Adhesions inside the filter medium 231 of the filter element 203 and on the surface of the filtrate chamber 209 side can be removed without removing the filter element.

[Fourth Embodiment]
FIG. 6 is a vertical cross-sectional view showing the overall configuration of the fourth embodiment of the filtration device according to the present invention. This filtration device also filters ballast water of a ship, for example, and has a filter element placed horizontally in order to accommodate an installation location where there is no space in the vertical direction. The basic configuration of this filtration device is the same as that of the second embodiment, and includes a casing 301, a partition wall 302, a filter element 303, a backwash mechanism 304, and a high pressure washing mechanism 305.

The casing 301 has a tubular shape with both ends closed, and is arranged horizontally so that the axes are horizontal. The fluid inlet 306 is eccentric with respect to the axis of the casing 301 at one end 301b of the casing 301. The fluid outlet 307 is provided at the above-mentioned position, and the fluid inlet 306 is provided at the other end 301c of the casing 301. By arranging the fluid inlet 306 eccentrically with respect to the axis of the casing 301, a space on the outer surface of one end portion 301b is secured so that the geared motor 313 described later can be arranged there. Further, in the present embodiment, the fluid outlet 307 is provided on the same axis of the fluid inlet 306. This made it possible to insert the filtration device in the middle of a straight pipe. Specifically, the casing 301 is composed of a tubular casing main body 301a, a left end plate 301b forming one end thereof, and a right end plate 301c forming the other end. The left end plate 301b is provided with a fluid inlet 306, and the right end plate 301b is provided with a fluid inlet 306. A fluid outlet 307 is provided on the plate 301c. The position of the fluid outlet 307 can be changed within the range of the right end plate 301c. The partition wall 302 is provided vertically, and the inside of the casing 301 is separated into a stock solution chamber 308 on the fluid inlet 306 side and a filtrate chamber 309 on the fluid outlet 307 side.

The filter element 303 has a cylindrical shape and has the same internal structure as that of the first to third embodiments, but is provided horizontally in the stock solution chamber 308 so that the rotation axis is in the same direction as the axis of the casing. One end portion is penetrated and supported by the cylindrical portion 310 and communicates with the filtrate chamber 309 via the cylindrical portion 310, and a rotating shaft 314 is provided at the other end portion, which is supported by the support frame 315. The support frame 315 does not obstruct the flow of the fluid in the left-right direction in FIG. A gear 316 is provided on the rotating shaft 314. On the other hand, a geared motor 313 for rotating the filter element 303 is provided on the outer surface of the one end portion 301b of the casing 1, and the output shaft 317 thereof extends through the one end portion 301b into the casing 301. A gear 318 is provided on the output shaft 317. A chain 319 is hung between the gear 318 and the gear 316, whereby the rotation of the geared motor 313 is propagated, and the filter element 303 is configured to rotate.

The backwash mechanism 304 is also provided horizontally as in the second embodiment, and the backwash head 341 is configured to come into contact with the filter element 303 to backwash the filter medium.

The high-pressure cleaning mechanism 305 is also provided horizontally as in the first and second embodiments, and is configured to inject a fluid from the nozzles 353a and 353b onto the filter medium 331 of the filter element 303. The high-pressure cleaning mechanism 305 is also configured to be removable from the casing 301. That is, the right end of the right guide portion 351b is detachably fitted and fixed to the seat 356 provided so as to hang down from the inner surface of the casing main body 301a. Further, a disk-shaped small flange (not shown) is fitted on the outer periphery of the left side guide portion 351a near the left end portion, and the small flange is penetrated on the outer surface of the left end plate 301b and provided on the left end plate 301. By fixing so as to cover the hole (not shown), the entire high pressure cleaning mechanism 305 is fixed to the casing 1. With this structure, the entire high-pressure cleaning mechanism 305 can be attached to and detached from the casing 301 through the through hole (not shown) without disassembling the casing 301. Other than that, the configuration of the present filtration device is the same as that of the filtration device of the second embodiment.

The operation of the filtration device of the fourth embodiment configured as described above is basically the same as that of the second embodiment. That is, at the time of filtration, the fluid to be filtered flows into the stock solution chamber 308 in the casing 301 from the fluid inlet 306 as shown by the solid arrow, and the backwash head 341 of the cylindrical filter medium 331 comes into contact with the backwash head 341. It is filtered by passing through the non-existing portion and flowing into the inside of the filter element 303. The filtered fluid flows into the filtrate chamber 309 and flows out through the fluid outlet 307.

At the time of backwashing, the fluid inside the filter element 303 passes through the filter medium 331 and flows into the backwash head 341 as shown by the white arrows, so that the filter medium 331 is backwashed. Since the filter element 303 is rotated by the geared motor 313, the entire surface of the filter medium 331 is backwashed while scraping the trapped object with the removal brush 344. However, even during the backwash, the filtration is continued in the portion of the cylindrical filter medium 331 that is not in contact with the backwash head 341.

Similar to the first to third embodiments, the high-pressure washing can be performed during the filtration operation without draining the fluid of the filtration device, or can be performed in the state where the fluid of the filtration device is drained. The high-pressure cleaning mechanism 305 is operated to inject fluid (clean water) from two nozzles 353a and 353b provided on the stock solution chamber side, and the nozzles 353a and 353b are directed in a direction parallel to the axis of the cylindrical filter element 303. Is reciprocated to perform fluid injection on the entire length of the filter medium 331. As in the case of backwashing, the entire surface of the filter medium 331 is washed with high pressure by injecting fluid while rotating the filter element 303 with the geared motor 313.

According to the fourth embodiment, even in the configuration in which the filter element 303 is arranged horizontally, the inside of the filter medium 331 of the filter element 303 generated by backwashing or the like due to the injection of the fluid from the stock solution chamber 308 side by the high pressure washing mechanism 305 or the like. Adhesions on the surface of the filtrate chamber 309 side can be removed without removing the filter element 303. In such a horizontal configuration, it may be difficult to remove the filter element 303, so it is a great advantage that the filter element 303 does not have to be removed for cleaning.

In the first to fourth embodiments, a cylindrical filter that allows fluid to pass from the outside to the inside for filtration is used as the filter, but the present invention is not limited to this, and the present invention is not limited to this, and the present invention is not limited to this. A cylindrical filter that allows the fluid to pass through and filters may be used. In that case, the nozzle of the high pressure washer is placed inside the cylindrical filter.
Further, a flat filter may be used instead of the cylindrical filter. In that case, the high pressure cleaning mechanism has, for example, an XY moving mechanism so that the nozzle can be scanned in the XY direction to perform high pressure cleaning on the entire surface of the flat filter. You may. Furthermore, the nozzle position of the high-pressure cleaning mechanism may be fixed and the filter side may be moved so that the entire surface of the filter can be cleaned with high pressure.
Furthermore, in the filter cleaning method of the filtration device of the present invention, high-pressure cleaning may be performed manually using a commercially available high-pressure cleaning instrument without using the high-pressure cleaning mechanism as in the first to fourth embodiments. good.

1 ... Casing 2 ... Partition 3 ... Filter element (filter)
5 ... High-pressure cleaning mechanism 6 ... Fluid inlet 7 ... Fluid outlet 8 ... Stock solution chamber 9 ... Filtration chamber 13 ... Geared motor (contact surface position moving means)
31 ... Filter media 52 ... Moving cylinder (fluid injection position moving means)
53a, 53b ... Nozzle 104 ... Backwash mechanism 141 ... Backwash head 142 ... Backwash fluid discharge pipe

Claims (2)

A casing having a fluid inlet and a fluid outlet, and internally provided with a stock solution chamber communicating with the fluid inlet and accommodating the fluid before filtration and a filtrate chamber communicating with the fluid outlet and accommodating the fluid after filtration.
A filter, which is installed inside the casing and allows a fluid to pass from the stock solution chamber side to the filtrate chamber side and filters the fluid, is provided.
In a filtration device capable of backwashing, in which a fluid is passed from the filtrate chamber side to the stock solution chamber side to peel off traps adhering to the filter.
The backwashing means for backwashing and
A high-pressure washing mechanism that injects a high-pressure fluid from the stock solution chamber side to the filtrate chamber side so as to pass through the filter and removes deposits inside the filter and on the surface of the filtrate chamber side by high-pressure washing .
With
The backwashing means is arranged so as to be in contact with a part of the filter from the stock solution chamber side, and the backwashing head for passing the fluid in the filtrate chamber through the filter and sucking the backwashing head, and the backwashing head for the filter. The contact surface position moving means for moving the contact surface position, the backwash fluid discharge pipe for discharging the fluid sucked by the backwash head to the outside of the casing, and the contact surface with a part of the filter of the backwash head. It is configured to include a removal brush provided in a portion to be provided and flocked around a slit-shaped suction hole covering the entire length of the filter medium of the filter.
After the backwashing is performed, filtration device, characterized in that the high-pressure cleaning is performed by the high-pressure cleaning mechanism. A casing having a fluid inlet and a fluid outlet, and internally provided with a stock solution chamber communicating with the fluid inlet and accommodating the fluid before filtration and a filtrate chamber communicating with the fluid outlet and accommodating the fluid after filtration.
A filter, which is installed inside the casing and allows a fluid to pass from the stock solution chamber side to the filtrate chamber side and filters the fluid, is provided.
A filter cleaning method for cleaning the filter of a filtration device capable of backwashing, in which a fluid is passed from the filtrate chamber side to the stock solution chamber side to peel off traps adhering to the filter.
In the backwash, the fluid in the filtrate chamber is sucked through the filter by a backwash head arranged so as to contact a part of the filter from the stock solution chamber side, and the backwash head with respect to the filter is sucked. The contact surface position is moved by the contact surface position moving means, the fluid sucked by the backwash head is discharged to the outside of the casing by the backwash fluid discharge pipe, and the contact surface is brought into contact with a part of the filter of the backwash head. Using a removal brush provided on the portion and planted around a slit-shaped suction hole covering the entire length of the filter medium of the filter, the trapped material is scraped by the removal brush when the filter medium of the filter is backwashed. While removing, it is performed on the entire surface of the filter medium, thereby removing traps adhering to the surface of the filter on the stock solution chamber side.
After the backwashing is performed, a high-pressure fluid is sprayed from the stock solution chamber side to the filtrate chamber side so as to pass through the filter to remove deposits on the inside of the filter and the surface of the filtrate chamber side. Cleaning A filter cleaning method for a filtration device, which is performed by high-pressure cleaning.

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