JP2001514067A - Suspension filtration equipment - Google Patents

Abstract

Abstract: A device for filtering a suspension, such as a fiber pulp suspension, forming a mat, the peripheral chamber being arranged to act as a drop leg during upward movement of the disc. And a rotating annular disc (6) having To increase the speed at which the peripheral chambers are emptied, air is applied to each of the peripheral chambers where the disk moves upward, with the peripheral chamber being at least partially above the suspension to be filtered during rotation of the disk. Ventilation means (21, 23) for supplying the air.

Description

DETAILED DESCRIPTION OF THE INVENTION

 The present invention relates to an apparatus for filtering a suspension such as fiber pulp.

EP-B1-515492 discloses a device having at least one annular vertical hollow filter disc having two opposing side walls made of a filtering material and having a central chamber formed therein. ing. Means are provided for rotating the annular filter disk about a horizontal axis extending through the center of the filter disk. A partition extends between opposing sidewalls of the filter disk and is arranged to divide the interior of the filter disk such that several peripheral chambers are disposed continuously around the filter disk. . Each peripheral chamber communicates with the central chamber via an outlet hole. The filter disc is made so that it is partially immersed in the liquid of the suspension to be filtered, whereby small fragments of the suspension are passed by hydrostatic pressure through the side walls of the filtering material and into the outer chamber. And further into the central chamber via the outlet hole of the peripheral chamber. The central chamber is provided with means for maintaining a reservoir of fine fragments. At any point in the rotation of the filter disk during upward movement of the filter disk, the partition wall is arranged so that each outer chamber is at least partially above a reservoir of fine fragments, where the outer wall is located. The outlet of the chamber opens into a reservoir of small pieces.

The outer peripheral chamber of this known device functions as a drop leg when raised. This is because at this stage of rotation, the mat formed of coarse pieces covering the filtration wall portion of the outer peripheral chamber is more or less impermeable. This helps the coarse particles of the suspension to be efficiently dewatered. Such a filter disc having an integral drop leg does not require the space as an external drop leg.

However, a problem with the device of EP-B1-515492 is that the rotational speed of the disc is limited, because the rising outer peripheral chamber has a mat formed by the filtration wall of the outer peripheral chamber. This is because it needs to be emptied before reaching the removal area to be removed by spraying. In the case of filtration of a fibrous pulp suspension, which forms a very hard mat, the rotation speed of the disc needs to be particularly slow, since the air passes very slowly through the mat to the outer chamber. Ability decreases.

[0004] It is an object of the invention to improve the filtration capacity of a device of the type disclosed in EP-B1-515492.

[0005] The purpose of this is to increase the speed at which the peripheral chamber is emptied, at the part of the upward movement of the filter disk during rotation of the filter disk, where the peripheral chamber is at least partially above the liquid suspension. This is achieved, at one time, by an integrated drop-leg filtering device as described above, characterized by having ventilation means for supplying air to each peripheral chamber.

[0006] By the supply of air into the outer peripheral chamber by the ventilation means, the speed of emptying the outer peripheral chamber is two to three times faster than that of a known filtering means. This significantly increases the rotational speed of the filter disk and improves the filtration capacity of the device.

It is desirable that the ventilation means is provided so as to supply air from the central chamber to the outer peripheral chamber. However, instead of this, the venting means comprises a valve provided in each outer chamber, which valve is opened in a predetermined area so that air can enter the outer chamber from outside the device during rotation of the filter disc. You may be able to.

The venting means is in the form of a venting passage extending from the central chamber to the respective outer peripheral chamber, and at the radially outermost side of the outer peripheral chamber, close to the end in the direction of travel as viewed from the direction of rotation of the filter disc. Thus, it is desirable to open to the outer peripheral chamber. Each vent passage is inactive while not communicating with the air above the fine fragment reservoir in the central chamber. When each of the outer peripheral chambers rises to a position where air enters the ventilation passage attached to the outer peripheral chamber, the ventilation passage operates to supply air to the outer peripheral chamber.

The ventilation passage of each peripheral chamber is opened in front of the outlet hole of the peripheral chamber when viewed from the direction of rotation of the filter disk, so that the function of the ventilation means is particularly reliable.

[0010] In the simplest embodiment of the device according to the invention, the ventilation means is located from the central chamber in each of the peripheral chambers so as to be located close to the end in the direction of travel of the peripheral chamber when viewed in the direction of rotation of the filter disc. , Wherein the interior of the pipe defines the ventilation passage.

In the device disclosed in EP-B1-515492, the generated fine fragments are
Means are provided for separating into turbid fine fragments and clear fine fragments. In this connection, EP-B1-515502 discloses the separating means in detail. The means for separating the fine pieces extends axially inside the central chamber and divides the central chamber into at least two axial grooves for receiving turbid fine pieces and clear fine pieces, respectively. It has a solid partition wall. The central chamber is surrounded by a cylindrical wall and has fragment discharge means for separately discharging turbid fine fragments and clear fine fragments from this axial groove.
The device of the present invention may be similarly designed if it is desired to recover turbid and fine fragments. However, in practice, it has been shown that the increased rotational speed of the filter disk made possible by the ventilation means described above increases the amount of mixture of turbid and fine fragments. In order to reduce the amount at least to some extent, the partition can be moved forward in the direction of rotation of the disc if the clear fine pieces from the device allow a resulting reduced flow. .

Thus, in the apparatus of the present invention, an optimal flow of clear fine fragments is obtained by incorporating means for separating fine fragments without forcing to limit the rotational speed of the disk. Thus, the fixed partition and the cylindrical wall form the first and second distribution chambers. The first distribution chamber is adjacent to the axial channel for the turbid fine pieces, and is relatively clear flowing through the first distribution chamber through the outlet hole of the outer peripheral chamber during rotation of the filter disc. It is designed to receive the fine pieces and feed the received relatively clear fine pieces into an axial channel for the turbid fine pieces. The second distribution chamber abuts the axial channel for the clear fraction and receives the clear fine fragments flowing through the second distribution chamber through the outlet aperture of the outer peripheral chamber during rotation of the filter disk. It is designed to distribute this received fine fragment into an axial channel for the fine fragment.

Since the pressure in the two distribution chambers is due to the head between the liquid of the suspension and the respective distribution chambers, the relatively clear fine pieces contain the turbid fine pieces from the first distribution chamber. Substantially all the clear fine pieces flowing into the second distribution chamber are extruded into the axial channel, which contains the clear fine pieces. Since there is only a slight pressure between the two dispensing chambers, a small amount of clear fine fragments flows from the second dispensing chamber to the first dispensing chamber. In this way, a clear separation of the turbid and clear fragments allows a high rotation speed of the filter disc and thus a large flow of clean, high quality filtered water.

The present invention will be described in detail below with reference to the drawings and embodiments.

FIGS. 1 and 2 show a device according to the invention, comprising a container 1 and a hollow rotor shaft 2 which forms a central chamber 3 having a cylindrical wall 4.
The rotor shaft 2 is supported on the container 1 so as to be rotatable on a horizontal axis 5. Three annular vertical hollow filter disks 6 are mounted coaxially on the horizontal axis 5 apart from one another. A driving motor 7 is connected to the rotor shaft 2 and rotates the disk 6 counterclockwise as shown in FIG. A supply 8 is arranged on the downward moving side of the filter disc 6 to supply the suspension to be filtered to the container 1, and a discharge 9 is provided on the upward moving side of the filter disc 6 from the filter disc 6. It is arranged to receive a large piece of mat or cake that has been peeled off by the shower device 10.

Each filter disk 6 has two opposing side walls 11 made of a filtering material. A partition wall 12 extends between the opposing side walls 11, and divides the interior of the filter disk into a plurality of outer peripheral chambers 13 (the number of outer peripheral chambers 13 is an appropriate number from 16 to 20). 6 are arranged side by side. Each outer peripheral chamber 13 communicates with the central chamber 3 through an outlet hole 14 of the cylindrical wall 4.

The central chamber 3 has means for separating the generated fine fragments into turbid fine fragments and clear fine fragments. The separating means comprises a fixed rigid partition 15 which separates the central chamber 3 into an axial channel 16 for receiving turbid fine fragments and an axial channel 3a for receiving clear fine fragments. Channel 16
Extend in the axial direction along the central chamber 3 and extend outwardly towards the outlet 17. The clear fine pieces can be collected in the channel 3a in the lower part of the central chamber 3, in which a reservoir 18 of fine pieces is formed. Water storage unit 18
Surface level 18a is determined primarily by the appropriate dimensions of the central chamber 3. Level 18a may instead be determined by an adjustable overflow. The clear and fine pieces collected in the axial waterway 3 a are discharged to the discharge unit 19. The partition 15 is rotatable about the horizontal axis 5 and is connected to the container 1 by adjusting means 20 for adjusting the position of the partition 15 in the central chamber 3.

FIG. 5 shows details of the structure of the outer peripheral chamber 13 on the upward moving side of the filter disk 6. Each outer peripheral chamber 13 includes partition walls 12a and 12b which extend straight in the radial direction.
The innermost ends in the radial direction of the partition walls 12a and 12b are connected to the slightly curved partition walls 12a 'and 12b' extending in the opposite direction as viewed from the rotational direction. The radially innermost ends of the curved partition walls 12a 'and 12b'
On both sides of the outlet hole 14 of the outer peripheral chamber 13, it contacts the cylindrical wall 4, where the outlet hole 14 extends from the end of the lower curved partition wall 12 b ′, but is curved upward. It is separated from the end of the partition wall 12a '. Thus, between the outlet hole 14 and the end of the upper curved partition wall 12a 'there is a circumferential wall portion 4a of the cylindrical wall 4.

Ventilation means in the form of a pipe 21 passes from the central chamber 3
The outer peripheral chamber 13 extends toward the radially outermost portion of the outer peripheral chamber 13 near the end 22 in the traveling direction. A passage 23 for supplying air from the central chamber 3 to the outer peripheral chamber 13 is formed inside the pipe 21. Pipe 21 is part 4a of the wall
But preferably instead extends through, as shown in FIG.
The lower end 21 a may face the outlet 14 in the traveling direction portion of the outlet 14.

As shown in FIGS. 6 and 8, the fixed partition wall portion 15 has three walls 24, 25, 26 extending straight in the axial direction at a portion moving downward of the cylindrical wall 4. The longitudinal ends of each wall are close to, but spaced apart from, the cylindrical wall 4 of the rotor shaft 2. By means of the walls 24, 25, 26 and the cylindrical wall 4, a first distribution chamber 27 adjacent to the axial channel 16 for turbid fine pieces and an axial channel 3a for clear fine pieces. And a second distribution chamber 28. As shown in FIG. 8, at the free ends of the straight walls 24, 25, 26, the cylindrical wall 4 and the respective straight walls 24,
In order to adjust the gap between the rotor shafts 25, 26, axial extension plates 29a, 29b, 29c are provided which are adjustable in the radial direction of the rotor shaft 2. As shown in FIGS. 3 and 7, the longitudinal direction of the distribution chambers 27 and 28 is divided by two gable walls 30 and 31 located on opposite sides of the side walls of the three filter disks 6. . The gable walls 30, 31 have adjustable sealing plates 32, 33.

FIGS. 9 and 10 show an application example of the distribution chamber, wherein an additional distribution chamber 34 is provided between the distribution chamber 27 and the distribution chamber 28. In this case, the partitioning chamber 27 is adapted to receive relatively clear finer pieces which are less clear than the corresponding relatively clear finer pieces obtained in the embodiment of FIGS. 1 and 8. The part 15 has to be moved somewhat upwards by the adjustment part 20. In other words, the distribution chamber 27 must also accept fine fragments characterized by being relatively turbid. The distribution chambers 27, 28, 34 are provided with two additional gable walls 35 provided with sealing plates 37, 38.
, 36 in the longitudinal direction. Additional gable walls 35,36 surround the three filter discs 6, each being spaced from the gable walls 30,31. As a result, as shown by the arrows in FIG. 10, the relatively turbid fine fragments can pass from the distribution chamber 27 through the sealing plates 37, 38 into the axial channel 16 and thereby, The relatively cloudy fine pieces are substantially prevented from escaping into the axial channel 3a via the sealing plates 32 and 33.

In operation, the suspension to be filtered is supplied to the container 1 through a supply 8, which is normally filled to a level above said horizontal axis 5. The filter disk 6 is rotated by the drive motor 7 and the outer peripheral chamber 13 is successively submerged in the suspended matter. Referring to FIG. 6, when the outer peripheral chamber 13 is lowered to the position indicated by the capital letter A, the turbid fine fragments pass through the material for filtration by the hydrostatic pressure and are pushed into the outer peripheral chamber 13, while the mat of coarse pieces is used for filtration. It accumulates on the ingredients. In the position indicated by the capital letter B, the outer peripheral chamber 13 is filled with turbid fine pieces,
Through the water channel 16. The mat on the filtering material is already thick and stiff enough to itself be the filtration medium, and the clear, fine pieces are
3 and mix with turbid fine pieces. In the position indicated by the capital letter C,
The outer peripheral chamber 13 has turbid fine fragments near the exit aperture 14, clear fine fragments near the filtering material, and relatively clear fine fragments in between. In the position indicated by the capital letter D, all turbid fine fragments must be removed from the outer chamber 13. If not, the adjuster 20 is operated to adjust the position of the distribution chambers 27, 28 somewhat downward. In FIG. 6, the angle α indicates the extent of the central chamber 3 in which turbid fine fragments can be received. Outlet hole 14 of peripheral chamber 13
Passes past the dispensing chamber 27, the dispensing chamber 27 receives the relatively clear and fine fragments. In the position indicated by the capital letter E, clear fine pieces flow into the distribution chamber 28.

The pressure in the distribution chambers 27, 28 is substantially the same, but higher than the periphery of the central chamber 3, so that the relatively clear and small pieces flowing into the distribution chamber 27 are separated by the cylindrical wall 4 and the plate. Axial channel 1 for turbid fine pieces through gap with 29a
6 flows into the distribution chamber 28, while the clear fine pieces flow into the axial channel 3a for the clear fine pieces through the gap between the cylindrical wall 4 and the plates 29c, 32 and 33. to continue. Due to the slight pressure difference between the two distribution chambers 27, 28, only a small flow of the clear, fine pieces flows from the distribution chamber 28 to the distribution chamber 27.
To occur.

Referring to FIG. 5, when the outer peripheral chamber 13 is located at a position indicated by a capital letter F in the upwardly moving portion of the filter disk 6, the filtration material in the outer peripheral chamber 13 substantially removes liquid. Covered with a hard mat of coarse pieces that do not pass. On the other hand, the outlet hole 14 of the outer peripheral chamber 13 is opened into the water storage section 18 of a small fragment, and the liquid inside the outer peripheral chamber 13 is above the level 18a on the surface of the water storage section. This produces a negative pressure. When the peripheral chamber 13 moves further upward from the position F and rises above the level of the surface of the suspension in the container 1 outside the filter disc 6, the above-mentioned negative pressure in the peripheral chamber 13 further increases. When the outer peripheral chamber 13 reaches the position indicated by the capital letter G, air can enter the pipe 21 from the central chamber 3 and is sucked into the upper part of the outer peripheral chamber 13 via the pipe 21 by the negative pressure. As a result, the outer peripheral chamber 13 quickly becomes empty. When the outer peripheral chamber 13 moves from the position G to a region where the shower 10 beats the hard mat made of coarse pieces from the filtering material, the mat separates from the filtering material and moves into the discharge section 9, and the outer peripheral chamber 13 is completely empty. Becomes

The installation of the aeration means and the micro-fragment distribution chamber according to the invention, in the case of the filtration of fiber pulp suspensions, in some applications increases the rotation speed of the filter disc by more than 100%. This substantially increases the capacity of the device of the present invention.

[Brief description of the drawings]

FIG. 1 is a side view of the device of the present invention.

FIG. 2 is a sectional view taken along section II-II in FIG. 1;

FIG. 3 is a partial sectional view taken along a section III-III in FIG. 2;

FIG. 4 is a partially detailed enlarged view of FIG. 1;

FIG. 5 is an enlarged vertical sectional view of an upward moving portion of the filter disk of the apparatus of the present invention.

FIG. 6 is a partially enlarged cross-sectional view taken along a cross section VI-VI of FIG. 2;

FIG. 7 is a partially enlarged sectional view taken along section VII-VII of FIG. 2;

FIG. 8 is an enlarged detail view of the embodiment of FIG. 6;

FIG. 9 is an application example of the embodiment of FIG. 8;

10 is a partial longitudinal sectional view along the section XX of FIG. 9;

[Procedural Amendment] Submission of translation of Article 34 Amendment of the Patent Cooperation Treaty

[Submission Date] March 1, 2000 (200.3.1)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

The wherein venting means, respectively from the central chamber (3) outer peripheral chamber (13) venting passage extending inside (23) are formed, the suspension of claim 1 Filtration device.

3. The ventilating passage (23) opens into the outer peripheral chamber (13) near an end of the outer peripheral chamber in the traveling direction when viewed from the direction of rotation of the filter disk (6). 3. The apparatus for filtering a suspension according to item 2 .

4. The suspension filtration device according to claim 3 , wherein the ventilation passage (23) opens to the outer peripheral chamber (13) at the radially outermost side of the outer peripheral chamber.

5. The vent passage (23) of each outer peripheral chamber (13) has a central chamber (14) in front of an outlet hole (14) of the outer peripheral chamber when viewed from the direction of rotation of the filter disk.
3. The suspension filtration device according to claim 2 , which is open to 3).

6. The ventilation passages (21, 23) extend from the central chamber (3) into the respective outer peripheral chambers (13) in the traveling direction of the outer peripheral chamber when viewed from the direction of rotation of the filter disk (6). 3. The suspension filtration device according to claim 2 , comprising a pipe (21) extending to a position near the end, wherein the ventilation passage (23) is formed inside the pipe.

7. A pipe (21) extends toward the radially outermost adjacent to the position of the circumferential chamber (13), a filtration device of suspension of claim 6.

8. The system further extends axially inside the central chamber (3),
And a fixed partition (15) dividing the interior of the central chamber into at least two axial grooves (27, 28; 34) for receiving turbid and fine fragments respectively. The central chamber is defined by a cylindrical wall (4) and means for discharging fine fragments (17,...) For discharging said turbid fine fragments and clear fine fragments separately from this axial groove; 19)
A fixed partition wall and a cylindrical wall are provided between the first and second distribution chambers (27) between the two axial grooves.
, 28), the first distribution chamber (27) being relatively clear flowing through the first distribution chamber through the outlet hole (14) of the outer peripheral chamber during the rotation of the filter disc (6). A second distribution chamber (28) for receiving the fine fragments and distributing the received relatively clear fine fragments to an axial channel (16) for the turbid fine fragments.
Receives, during rotation of the filter disc, a clear fine fragment flowing through the second distribution chamber through the outlet hole of the outer peripheral chamber, and converts the received clear fine fragment into an axis for the clear fine fragment. A suspension filtration device according to claim 1, adapted to distribute to a directional channel (3a).

9. Furthermore, the first and second distribution chamber a position of (27, 28),
9. The suspension filtration device according to claim 8 , comprising adjusting means (20) for adjusting the circumferential direction of the cylindrical wall (4).

10. The suspension filtration device according to claim 9 , wherein the partition (15) is rotatable about a horizontal axis (5) by adjusting means (20).

11. Each distribution chamber (27, 28) are circumferential extension equal extension of the outlet hole (14) in the circumferential direction, at least the outer peripheral chamber (13) of the cylindrical wall (4) 9. The apparatus for filtering a suspension according to claim 8 , comprising:

──────────────────────────────────────────────────続 き Continuation of front page (81) Designated country EP (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE ), OA (BF, BJ, CF, CG, CI, CM, GA, GN, GW, ML, MR, NE, SN, TD, TG), AP (GH, GM, KE, LS, MW, SD, SZ, UG, ZW), EA (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM), AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, CA, CH, CN, CU, CZ, DE, DK, EE, ES, FI, GB, GE, GH, GM, HR, HU, ID, IL, IS, JP, KE, KG, KP , KR, KZ, LC, LK, LR, LS, LT, LU, LV, MD, MG, MK, MN, MW, MX, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, SL, TJ, TM, TR, TT, UA, UG, US, UZ, VN, YU, ZW

Claims (12)

[Claims] 1. At least one annular vertical hollow filter disc (6) having two opposite side walls (11) made of a filtering material and forming a central chamber (3); Means (7) for rotating the annular filter disc about a horizontal axis (5) extending through the center of the disc; and several extending between opposing side walls of the filter disc. Outer chamber (13
) Are partition walls (12) that divide the inside of the filter disk so that they are continuously arranged around the filter disk, and each outer peripheral chamber (13) has an outlet hole (14).
), The filter disc being made so that it is partially immersed in the liquid of the suspension to be filtered, whereby small fragments of the suspension are filtered by hydrostatic pressure. Partition wall (1) which is pushed into the outer peripheral chamber through the side wall made of the material, and further pushed into the central chamber via the outlet hole of the outer peripheral chamber.
2) means for maintaining a water reservoir (18) of fine fragments in the central chamber, wherein each peripheral chamber is located at any position of rotation of the filter disc during upward movement of the filter disc. A partition wall is arranged so that at least partly is above the water reservoir of the fine fragment, in order to maintain the water reservoir (18), wherein the outlet hole of the outer peripheral chamber opens towards the water reservoir of the fine fragment. A filter for a mat forming a suspension, such as a fiber pulp suspension, comprising: Ventilation means (21, 23) for effectively supplying air to each peripheral chamber (13) in the upward movement of the filter disc (6) when partially above the liquid of the suspension. Filtration apparatus of the suspension characterized by Rukoto. 2. The suspension filtration device according to claim 1, wherein the ventilation means (21, 23) are arranged to supply air from the central chamber (3) to the outer peripheral chamber (13). 3. Filtration of a suspension according to claim 2, wherein the ventilation means are provided with ventilation passages (23) extending from the central chamber (3) into the respective outer peripheral chambers (13). apparatus. 4. The air passage (23) opens into the outer peripheral chamber (13) near the end of the outer peripheral chamber in the direction of travel as viewed from the direction of rotation of the filter disk (6). 3. The apparatus for filtering a suspension according to 3. 5. The ventilation passage (23) is located radially outermost of the outer peripheral chamber (23).
The suspension filtration device according to claim 4, which is open to 13). 6. The ventilation passage (23) of each peripheral chamber (13) is located in front of the outlet hole (14) of the peripheral chamber, when viewed from the direction of rotation of the filter disc.
4. The apparatus for filtering a suspension according to claim 3, wherein the apparatus is open. 7. The ventilation passages (21, 23) extend from the central chamber (3) into the respective outer peripheral chambers (13) in the traveling direction of the outer peripheral chamber when viewed from the rotation direction of the filter disk (6). A pipe (21) extending to a position near the end,
The suspension filtration device according to claim 3, wherein the ventilation passage (23) is formed inside the pipe. 8. The suspension filtering device according to claim 7, wherein the pipe (21) extends toward a position closest to the radially outermost side of the outer peripheral chamber (13). 9. Furthermore, at least two axial grooves (30) extending axially inside the central chamber (3) and receiving the turbid fine pieces and the clear fine pieces, respectively, inside the central chamber (3). 27, 28; 34), the central chamber being defined by a cylindrical wall (4), which separates the turbid and fine fragments separately from each other. A small fragment discharge means (17, 19) for discharging from this axial groove, wherein the fixed partition wall and the cylindrical wall are provided between the first and second axial grooves. Distribution room (27,
28), the first distribution chamber (27) being relatively clear flowing through the first distribution chamber through the outer chamber outlet hole (14) during the rotation of the filter disc (6). A second distribution chamber (28) is provided for receiving the fine fragments and distributing the received relatively clear fine fragments to an axial channel (16) for the turbid fine fragments. During the rotation, it receives the clear fine pieces flowing through the second distribution chamber through the outlet hole of the outer peripheral chamber and passes the received clear fine pieces to the axial channel for the clear fine pieces ( 3. A method according to claim 1, wherein the method is adapted to distribute to 3a).
3. The apparatus for filtering a suspension according to item 1. 10. The method according to claim 9, further comprising adjusting means (20) for adjusting the position of the first and second distribution chambers (27, 28) in the circumferential direction of the cylindrical wall (4). An apparatus for filtering the suspension as described. 11. The suspension filtration device according to claim 10, wherein the partition wall (15) is rotatable about a horizontal axis 5 by an adjusting means (20). 12. Each of the distribution chambers (27, 28) is arranged in a circumferential direction of the cylindrical wall (4).
10. The suspension filtration device according to claim 9, having an expansion portion at least equal to the circumferential expansion portion of the outlet hole (14) of each peripheral chamber (13).