JP7359593B2 - filtration equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a filtration device for removing foreign substances present in a liquid such as a cutting liquid used in, for example, a grinding machine, a lathe, a machining center, or the like.

As cutting fluid filtration devices used in machine tools such as grinders and lathes, devices are used in which a precoat layer of diatomaceous earth is formed on the outer peripheral surface of a filter tube, and the cutting fluid is filtered by passing through this precoat layer. As such a filtration device, the applicant has developed the device described in Patent Document 1 below.

The above-mentioned Patent Document 1 has the following description.
[0021]
FIG. 1 shows an embodiment of the filtration device of the present invention. This device includes a hollow filter unit 1, a filtration tank 2 in which the filter unit 1 is housed for filtering and storing dirty liquid, a suction pump 3 for suctioning the inside of the filter unit 1, and the filter unit 1. A slurry tank 4 is provided for storing a slurry of filter aid supplied to the vicinity of the slurry tank 1. A deposited layer of a powdery filter aid is formed on the surface of the filter unit 1, and liquid is filtered through the deposited layer.
[0023]
As shown in FIG. 2, the filter unit 1 includes eight thin box-shaped filter panels 5 arranged radially on the peripheral wall of a cylindrical body 7 so as to communicate internally. Panel plates (filter plates) 17 on both sides of each filter panel 5 are provided with a large number of punch holes 6 and covered with a wire mesh 8 . The filter unit 1 is housed in the filter tank 2 so that the panel plate 17 faces horizontally (the cylindrical body 7 faces vertically).
[0035]
Next, by operating the slurry pump 14 to supply the slurry in the slurry tank 4 to the vicinity of the panel plate 17 of the filter panel 5, the filter aid is deposited on the filter panel 5 to form a deposited layer, and the filter is repeatedly filtered. I do. On the other hand, by operating the discharge conveyor 12, the used filter aid on the discharge conveyor 12 is discharged from the filter tank 2.

Patent No. 3479003

The apparatus of Patent Document 1 does not specifically mention a method for attaching the filter plate 17 to both sides of the filter panel 5. Generally, the filter plate 17 is often attached to the filter panel 5 by screwing.

As the filter plate 17 is repeatedly used, the filter aid becomes stuck to the filter plate 17, and it is time to replace it soon. If the filter plate 17 is replaced repeatedly, the screw holes formed in the filter panel 5 for attaching the filter plate 17 will wear out and become unusable. If the screw holes become worn, they will need to be re-taped.

However, in the inner portions of the radially arranged filter panels 5, the spacing between adjacent filter panels 5 is narrow, making it extremely difficult to perform the retapping operation. If re-tapping is not possible, the attachment of the filter plate 17 to the filter panel 5 will be insufficient at the inner portion of the filter panel 5. This causes a problem in that a gap is created in that portion, causing a leak, and the suction efficiency of the suction pump 3 is reduced.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a filtration device in which the problem of decrease in suction efficiency is less likely to occur even if the filter plate is replaced repeatedly.

In order to achieve the above object, the filtration device according to claim 1 employs the following configuration.
A filtration device that forms a deposited layer of a powdery filter aid on the plate surface of a filter plate and filters a liquid with the deposited layer,
a hollow filter unit having a filter plate on at least a part of the surface;
a filtration tank in which a liquid to be filtered is stored and the filter unit is housed;
a suction pump that sucks the inside of the filter unit;
and an auxiliary agent discharging means for discharging a filter aid near the plate surface of the filter plate,
The filter unit includes a central hub unit and a plurality of filter panels whose base sides are attached to the hub unit and are arranged radially in a plan view,
The filter panel has a thin box shape with filter plates attached to both sides, and the inside thereof communicates with each other via the hub unit.
Column-shaped fixing members having a length extending from the top to the bottom of the filter panel are arranged in the V-shaped valleys between the radially arranged filter panels, so that each of the fixing members , is configured to press and fix both filter plates attached to the filter panels adjacent to each other in the V-shape .

The filtration device according to claim 2 employs the following configuration in addition to the configuration described in claim 1.
The filter panel includes a U-shaped frame that opens toward the base, and filter plates that are attached to both sides of the frame,
The fixing member presses and fixes a portion of the filter plate on the open side of the frame .

In the filtration device according to claim 1, the filter unit is configured such that a plurality of thin box-shaped filter panels each having filter plates attached to both sides are arranged radially in a plan view so as to communicate internally with each other. ing. A fixing member for pressing and fixing both filter plates attached to adjacent filter panels is arranged near the base of the radial shape.
Therefore, in the portion near the radial base, both filter plates are pressed and fixed to the filter panel by the fixing member. As a result, even if the filter plate is replaced repeatedly, the screw holes will not wear out and create gaps where leaks may occur, and problems such as reduced suction efficiency will not occur. Further, columnar fixing members having a length extending from the top to the bottom of the filter panels are arranged in the V-shaped valleys between the radially arranged filter panels, so that the fixing members can be fixed to each other. The member is configured to press and fix both filter plates attached to the filter panels adjacent to each other in the V shape. Therefore, the fixing member is pushed toward the back of the V-shaped valley formed by the portion of the adjacent filter plate that extends beyond the U-shaped open side, and the fixing member is pressed against the hub unit and fixed. The columnar member presses both filter plates from the top to the bottom of the filter panel and fixes them to the filter panel. Therefore, no gaps are formed that would cause leaks, and the suction efficiency does not decrease.

In the filtration device according to claim 2, the filter panel includes a frame formed in a U-shape that opens toward the base side, and filter plates attached to both sides of the frame, and the fixing member is configured to Fix the filter plate by pressing the open side of the frame. By doing this, the fixing member is pushed toward the back of the V-shaped valley formed by the portion extending beyond the U-shaped open side of the adjacent filter plate, and The extended portion is pressed against and fixed to the hub unit.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining the whole structure of the filtration apparatus of one embodiment of this invention. It is a cross-sectional view showing a filter unit. It is a figure which shows a filter panel, (a) is a top view, (b) is a front view, (c) is a left view, and (d) is a right view. It is a figure which shows the frame of a filter panel, (a) is a top view, (b) is a front view, (c) is a left view, (d) is a right view. FIG. 3 is a diagram showing a filter plate, in which (a) is a front view and (b) is a partially enlarged sectional view taken along line BB. It is a figure which shows a hub unit, (a) is a top view of a top plate, (b) is a front view, and (c) is a cross-sectional view. It is a figure which shows a fixing member, (a) is a top view, (b) is a front view, and (c) is a bottom view. FIG. 2 is a diagram illustrating a state in which a fixing member is attached to a hub unit to fix a filter plate, in which (a) is a view of the fixing plate seen from above, (b) is a longitudinal cross-sectional view, and (c) is a cross-sectional view. , each showing only one side from the center of symmetry. It is a partially enlarged view explaining a state in which a fixing member is attached to a hub unit and a filter plate is fixed, in which (a) is a view of the fixing plate seen from above, and (b) is a cross-sectional view.

Next, a mode for carrying out the present invention will be described.

[Overall structure]
FIG. 1 shows the overall structure of an embodiment of the filtration device of the present invention.
This device includes a filter unit 1, a filtration tank 2, a suction pump 3, and an auxiliary agent discharge means 15.

The filter unit 1 is a hollow filter unit 1 having a filter plate 17 on at least a part of its surface.
The filter tank 2 stores the liquid to be filtered and also houses the filter unit 1. The filtration tank 2 stores, as the liquid, a dirty liquid to be subjected to filtration processing.
The suction pump 3 sucks the inside of the filter unit 1.
The aid discharging means 15 discharges a filter aid near the surface of the filter plate 17.

The filter tank 2 accommodates two filter units 1 in this example. Dirty fluid such as grinding fluid discharged from a machine tool is introduced into the filter tank 2 through an introduction line 11.

A deposited layer of powdery filter aid is formed on the surface of the filter plate 17 of the filter unit 1, and liquid is filtered through the deposited layer. The clean liquid filtered through the deposited layer is sucked by the suction pump 3, passes through the pump communication passage 9 and the supply line 13, and is again supplied to the machine tool or the like.

On the other hand, a discharge conveyor 12 is provided at the bottom of the filter tank 2 to discharge the used filter aid removed from the filter unit 1.

The filter aid is supplied as slurry from the slurry tank 4 to the aid discharge means 15 . The aid discharging means 15 supplies slurry of the filter aid around the filter unit 1 . The slurry tank 4 stores a slurry generated by mixing the clean liquid and the filter aid at a predetermined mixing ratio.

By operating the slurry pump 14, the aid discharging means 15 supplies the slurry (which is a mixture of the clean liquid and the filter aid) stored in the slurry tank 4 to the vicinity of the plate surface of the filter plate 17 of the filter unit 1. , to dispense the filter aid. Details of the filter unit 1 including the filter plate 17 will be described later.

The slurry tank 4 is replenished with clean liquid from the supply line 13 by opening the first electromagnetic on-off valve 24 . Further, the slurry tank 4 is replenished with the filter aid stored in the aid tank 25 by a feeder 26. The slurry tank 4 is provided with a first flow switch 23 . When the first flow switch 23 detects a drop in the liquid level of the slurry in the slurry tank 4, it opens the first electromagnetic on-off valve 24 to replenish the clean liquid, and operates the feeder 26 to feed the slurry from the auxiliary agent tank 25. Refill filter aid.

A break tank 20 is provided in the filtration device. The break tank 20 contains a clean liquid. The break tank 20 is provided with a second flow switch 21. When the second flow switch 21 detects a drop in the level of the clean liquid in the break tank 20, the third electromagnetic on-off valve 22 is opened and the clean liquid is replenished from the supply line 13.

The break tank 20 communicates with the pump communication passage 9 via a second electromagnetic on-off valve 19. By opening the second electromagnetic on-off valve 19, clean liquid is supplied to the pump communication passage 9. As a result, the negative pressure in the pump communication passage 9 and the filter unit 1 is released. That is, when the filtration ability of the deposited layer of the filter aid decreases, the negative pressure inside the filter unit 1 can be released and the old deposited layer can be peeled off.

An air cylinder 10 is attached to the upper part of the filter unit 1. The air cylinder 10 is capable of vertically swinging the filter unit 1. That is, when the filtering ability of the deposited layer of the filter aid decreases, the old deposited layer can be peeled off by shaking the filter unit 1.

The pump communication passage 9 is provided with a pressure sensor 18 that detects pressure changes within the pump communication passage 9. When the deposited layer of filter aid formed on the filter plate 17 becomes clogged, the negative pressure within the pump communication passage 9 and the filter unit 1 increases. When the pressure sensor 18 detects that this negative pressure has increased and reached a predetermined value, the second electromagnetic on-off valve 19 is opened to release the negative pressure inside the filter unit 1, and the air cylinder 10 is operated. to swing the filter unit 1. Due to the release of the negative pressure and the rocking of the filter unit 1, the old deposited layer is peeled off and falls onto the discharge conveyor 12.

[Overall structure of filter unit 1]
FIG. 2 is a cross-sectional view showing the filter unit 1. As shown in FIG.

The filter unit 1 includes a plurality of thin box-shaped filter panels 5 each having filter plates 17 attached to both sides, which are arranged radially in a plan view so as to communicate internally with each other. In this example, the filter unit 1 includes eight filter panels 5 arranged radially in a plan view and attached to a hub unit 30 arranged at the center thereof. The ends of each filter panel 5 are connected to the hub unit 30 so that their hollow interiors communicate with each other.

In the filter unit 1, a fixing member 50 for holding down and fixing both filter plates 17 attached to adjacent filter panels 5 is arranged near the radial base.

The filter unit 1 is housed in the filter tank 2 so that the filter plate 17 faces horizontally (the hub unit 30 faces vertically).

[Filter panel 5]
FIG. 3 is a diagram showing the filter panel 5. As shown in FIG. (a) is a plan view, (b) is a front view, (c) is a left side view, and (d) is a right side view.
The filter panel 5 is constructed by attaching filter plates 17 to both sides of a frame 16.

FIG. 4 is a diagram showing the frame 16. (a) is a plan view, (b) is a front view, (c) is a left side view, and (d) is a right side view.
The frame 16 is formed by connecting three channel members 16A so as to form a substantially U-shape when viewed from the front. Each channel material 16A is arranged so that the open side faces outward.

FIG. 5 is a diagram showing the filter plate 17. (a) is a front view, and (b) is a partially enlarged sectional view taken along line BB.

The filter plate 17 is constructed by laminating a frame member 17A, a mesh member 17B, and a punching plate 17C.
The frame member 17A can be formed by connecting steel bands in a substantially square shape.
A metal mesh member is used as the mesh member 17B.
The punching plate 17C is a steel plate with a large number of punch holes passing through it.

The filter plate 17 can be formed by laminating the frame member 17A and the punching plate 17C so as to sandwich the mesh member 17B and joining them by welding or the like.
When attaching the filter plate 17 to the frame 16 to form the filter panel 5, the frame member 17A is placed inside and the punching plate 17C is placed outside.

The filter plate 17 is formed into a rectangular shape with three sides of the U-shape matching the substantially U-shape of the frame 16 and extending toward the open side. The portion of the filter plate 17 extending beyond the U-shaped open side will be referred to as an extension portion 17D in the following description.

The filter panel 5 is constructed by attaching filter plates 17 to both sides of the frame 16. In this state, a hollow portion 5A is formed in the filter panel 5, which is surrounded by the U-shaped frame 16 and the filter plates 17 on both sides.

A plurality of bolt holes 16B are formed in the frame 16 and the filter plate 17, and the frame 16 can be fixed by being inserted with bolts 5B while the filter plates 17 are stacked on both sides of the frame 16. In this example, a plurality of bolt holes 16B through which the bolts 5B are inserted are provided at predetermined intervals on the upper and lower sides of the frame 16, which is formed in a substantially U-shape.

The bolt holes 16B and the bolts 5B are not provided in a portion of the frame 16 near the open side. In the part near the open side of the frame 16 (that is, the part near the radial base), the fixing member 50 presses and fixes both filter plates 17 attached to adjacent filter panels 5. ing.

In this state, the open side of the frame 16, which is formed in a substantially U-shape, is connected to the hub unit 30 so as to match the cassette portion 33 of the hub unit 30, which will be described later. That is, the open side of the frame 16 is arranged on the radial base side. In this state, a hollow region 34A of the hub unit 30, which will be described later, and a hollow portion 5A of the filter panel 5 communicate with each other.

[Hub unit 30]
FIG. 6 is a diagram showing the hub unit 30. (a) is a plan view of the top plate, (b) is a front view, and (c) is a cross-sectional view.

The hub unit 30 includes a bottom plate 31, a top plate 35, and eight cassette parts 33 located between them.

The bottom plate 31 is circular, and eight cassette parts 33 are arranged in a region near the center of the top surface. Eight presser units 32 are arranged around the eight cassette parts 33 to press the lower end member 53 of the fixing member 50.

The top plate 35 has a circular shape, and the eight cassette parts 33 are arranged on the bottom surface thereof. An octagonal fixing plate 36 is provided on the upper surface of the top plate 35 to fix the upper end member 52 of the fixing member 50.

The bottom plate 31, the top plate 35, and the fixed plate 36 are arranged coaxially so that their centers coincide with each other.

One filter panel 5 is attached to each of the eight cassette sections 33. The eight cassette sections 33 are arranged radially so that the eight filter panels 5 can be arranged radially. In the eight cassette sections 33, portions of adjacent cassette plates 33A of adjacent cassette sections 33 near the center are connected to each other. Thereby, the eight cassette parts 33 form eight hollow passages 34B that communicate with the hollow region 34A near the center and extend radially. The hollow region 34A is a region to which negative pressure is applied by the suction pump 3 described above.

The cassette section 33 is composed of a set of two cassette plates 33A, 33A. That is, the cassette section 33 is configured by two cassette plates 33A, 33A arranged in parallel at a predetermined interval between the bottom plate 31 and the top plate 35. The distance between the two cassette plates 33A, 33A is set to match the width of the frame 16 in the filter panel 5 described above.

The eight cassette sections 33 are arranged radially around the center of the bottom plate 31 and the top plate 35. By attaching the filter panels 5 to each of the cassette sections 33, eight filter panels 5 are arranged radially. The open side of the frame 16 constituting the filter panel 5 is attached to the cassette portion 33 . As a result, with the filter panel 5 configured by attaching the filter plates 17 to both sides of the frame 16, the hollow area 34A formed by the eight cassette parts 33 and the hollow part 5A of each filter panel 5 are connected to each other. They communicate through passage 34B.

The eight presser units 32 are arranged at equal intervals around the bottom plate 31. Each of the presser units 32 is arranged at a position exactly in the middle of the angle between the cassette parts 33 arranged so as to face in the radial direction.

The presser unit 32 includes a support plate 32A and two presser bolts 32B. The support plate 32A is fixed to the upper surface of the bottom plate 31 so that the plate surface faces the center of the bottom plate 31. Two penetrating screw holes are formed side by side in the support plate 32A, and presser bolts 32B are screwed into each of them. The fixing member 50 is disposed in the V-shaped space formed by the adjacent cassette plates 33A of the adjacent cassette sections 33, and its lower end member 53 is held down by the presser bolt 32B.

The fixing plate 36 is formed in an octagonal shape, and fixing screw holes 36A are formed on each of eight side surfaces. As described above, the fixing member 50 is placed in the V-shaped space formed by the adjacent cassette plates 33A of the adjacent cassette parts 33, and the upper end member 52 is inserted into the fixing screw hole 36A. It is designed to be fixed.

[Fixing member 50]
FIG. 7 is a diagram showing the fixing member 50. As shown in FIG. (a) is a plan view, (b) is a front view, and (c) is a bottom view.
The fixing member 50 is a columnar member having a length extending from the top to the bottom of the filter panel 5. In other words, the fixing member 50 is a columnar member having a length extending from the top to the bottom of the hub unit 30.

The fixing member 50 includes a pipe member 51, an upper end member 52, and a lower end member 53.

The pipe member 51 has a cylindrical shape when viewed from the outside, and has an upper end member 52 fitted into the upper end opening, and a lower end member 53 fitted into the lower end opening.

The lower end member 53 is formed from a round bar having the same outer diameter as the pipe member 51. It includes a fitting portion 53A that fits into the hollow interior of the pipe member 51, and a fixing protrusion 53B that protrudes toward the lower end side. A fixing plane 53C that is parallel to each other is formed on the fixing protrusion 53B. The fixing plane 53C of the lower end member 53 is held down by the holding bolt 32B of the holding unit 32 described above.

The upper end member 52 is formed from a round bar having the same outer diameter as the pipe member 51. It includes a fitting part 52A that fits into the hollow interior of the pipe member 51, a fixing protrusion 52B that protrudes toward the upper end, and a through hole 52C that is bored in the protrusion 52B. The upper end member 52 of the fixing member 50 is fixed to the fixing member 50 by screwing the bolt 52D inserted into the through hole 52C into the fixing screw hole 36A of the fixing plate 36.

[Fixing structure of filter plate 17]
FIG. 8 is a diagram illustrating a state in which the fixing member 50 is attached to the hub unit 30 and the filter plate 17 is fixed. (a) is a top view of the fixing plate 36, (b) is a vertical sectional view, and (c) is a horizontal sectional view. Only one side from the center of symmetry is shown in each case.
FIG. 9 is a partially enlarged view illustrating a state in which the fixing member 50 is attached to the hub unit 30 and the filter plate 17 is fixed. (a) is a top view of the fixing plate 36, and (b) is a cross-sectional view.

The filter panel 5 is attached to the cassette portion 33 of the hub unit 30. At this time, the frame 16 of the filter panel 5 is made to match the two cassette plates 33A, 33A constituting the cassette section 33. In this state, the hollow portion 5A of the filter panel 5 and the hollow region 34A of the hub unit 30 communicate with each other via the hollow passage 34B.

In this state, the extending portion 17D of the filter plate 17 that extends beyond the U-shaped open side of the frame 16 is arranged on the outside of the cassette portion 33. In other words, the extended portion 17D overlaps the outside of the cassette plate 33A constituting the cassette portion 33.

In this state, when the filter panels 5 are respectively attached to the adjacent cassette parts 33, the V-shaped valleys formed by the adjacent cassette plates 33A of the adjacent cassette parts 33 are the extension parts 17D of the adjacent filter panels 5. covers, and a V-shaped valley is formed by both extended portions 17D.

The fixing member 50 is disposed in the V-shaped valley formed by the adjacent extending portions 17D, and its lower end member 53 and upper end member 52 are respectively fixed and attached to the hub unit 30. That is, the lower end member 53 of the fixing member 50 is fixed by pressing its fixing plane 53C with the presser bolt 32B of the presser unit 32 described above. The upper end member 52 of the fixing member 50 is fixed by screwing a bolt 52D inserted through the through hole 52C into the fixing screw hole 36A of the fixing plate 36.

By doing so, the pipe member 51 of the fixing member 50 is pushed toward the back of the V-shaped valley formed by the adjacent extension portions 17D. In this state, the extended portion 17D is pressed against the cassette plate 33A, and the extended portion 17D of the filter plate 17 is fixed to the cassette portion 33.

[Filter aid]
The above-mentioned filter aid is not particularly limited as long as it has a roughly powder-like shape, and various kinds of filter aids can be used. For example, various materials such as diatomaceous earth, cellulose fiber, zeolite, activated carbon, silica gel, glass fiber, and ceramic fiber can be used. Among these, cellulose fibers are particularly preferably used because they easily form bridges on the mesh and the filter aids are easily entangled with each other, and a deposited layer is formed on the surface of the filter plate 17 very quickly. In the present invention, the term "powder-like" may be used as long as it can be mixed with a liquid to form a slurry, and the microscopic shape may be of various shapes such as fibrous, lumpy, flaky, etc. The purpose is to include things.

[Effects of embodiment]
In the filtration device of this embodiment, the filter unit 1 has a plurality of thin box-shaped filter panels 5 each having filter plates 17 attached to both sides, which are arranged radially in a plan view so as to communicate internally with each other. It is configured. A fixing member 50 for holding down and fixing both filter plates 17 attached to adjacent filter panels 5 is arranged near the base of the radial shape.
Therefore, in the portion near the radial base, both filter plates 17 are fixed to the filter panel 5 by being pressed by the fixing member 50. As a result, even if the filter plate 17 is replaced repeatedly, the screw holes will not wear out and create gaps where leaks may occur, and problems such as reduced suction efficiency will not occur.

In the filtration device of this embodiment, the fixing member is a columnar member having a length extending from the top to the bottom of the filter panel 5.
Therefore, the columnar member presses both filter plates 17 from the upper part to the lower part of the filter panel 5 and fixes them to the filter panel 5. Therefore, no gaps are formed that would cause leaks, and the suction efficiency does not decrease.

[Modified example]
Although particularly preferred embodiments of the present invention have been described above, the present invention is not intended to be limited to the illustrated embodiments, but can be modified and implemented in various ways, and the present invention includes various modified examples. The purpose is to For example, the number of filter units 1 accommodated in the filter tank 2 is not limited to two, and may be one or three or more.

Further, in the above embodiment, the cutting fluid of a machine tool is filtered, but the filter is not limited to this, and the fluid to be filtered may be coolant fluid of a rolling mill, condensate of a boiler, plating fluid, etc. It is intended to include various liquids such as liquid, beer, fruit juice, and other beverages.

1: Filter unit 2: Filtration tank 3: Suction pump 4: Slurry tank 5: Filter panel 5A: Hollow part 5B: Bolt 9: Pump communication path 10: Air cylinder 11: Introduction line 12: Discharge conveyor 13: Supply line 14: Slurry pump 15: Auxiliary agent discharge means 16: Frame 16A: Channel material 16B: Bolt hole 17: Filter plate 17A: Frame member 17B: Mesh member 17C: Punching plate 17D: Extension portion 18: Pressure sensor 19: Second electromagnetic On-off valve 20: Break tank 21: Second flow switch 22: Third electromagnetic on-off valve 23: First flow switch 24: First electromagnetic on-off valve 25: Auxiliary agent tank 26: Feeder 30: Hub unit 31: Bottom plate 32: Presser Unit 32A: Support plate 32B: Presser bolt 33: Cassette part 33A: Cassette plate 34A: Hollow area 34B: Hollow passage 35: Top plate 36: Fixing plate 36A: Fixing screw hole 50: Fixing member 51: Pipe member 52: Upper end member 52A: Fitting part 52B: Fixing protrusion 52C: Through hole 52D: Bolt 53: Lower end member 53A: Fitting part 53B: Fixing protrusion 53C: Fixing plane

Claims (2)

A filtration device that forms a deposited layer of a powdery filter aid on the plate surface of a filter plate and filters a liquid with the deposited layer,
a hollow filter unit having a filter plate on at least a part of the surface;
a filtration tank in which a liquid to be filtered is stored and the filter unit is housed;
a suction pump that sucks the inside of the filter unit;
and an auxiliary agent discharging means for discharging a filter aid near the plate surface of the filter plate,
The filter unit includes a central hub unit and a plurality of filter panels whose base sides are attached to the hub unit and are arranged radially in a plan view,
The filter panel has a thin box shape with filter plates attached to both sides, and the inside thereof communicates with each other via the hub unit.
Column-shaped fixing members having a length extending from the top to the bottom of the filter panel are arranged in the V-shaped valleys between the radially arranged filter panels, so that each of the fixing members , is configured to hold down and fix both filter plates attached to the filter panels adjacent to each other in the V-shape.
A filtration device characterized by: The filter panel includes a U-shaped frame that opens toward the base, and filter plates that are attached to both sides of the frame,
The filtration device according to claim 1, wherein the fixing member presses and fixes a portion of the filter plate on the open side of the frame .

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