JP2021065871A - Filter medium - Google Patents

Abstract

To provide a filter medium by which deliquoring can be efficiently performed in comparison with a case using a conventional filter medium.SOLUTION: A planar filter medium has: a body having a first surface at a side being in contact with a solid-liquid mixed raw material to be filtered and a second surface being the back surface of the first surface; and a plurality of draining slits formed at the body and mutually formed in parallel in a longitudinal direction. The first surface is formed in a corrugated uneven shape.SELECTED DRAWING: Figure 1

Description

The techniques disclosed herein relate to filter media used to separate liquids and solids from solid-liquid mixed raw materials in which liquids and solids are mixed, such as sludge.

Patent Document 1 discloses a screw liquid remover. This screw deflated machine has a cylindrical barrel (filtration cylinder) formed of a perforated plate, a screw body arranged in the barrel, and a solid-liquid mixing raw material (a solid-liquid mixing raw material) which is charged into the screw body by rotating the screw body. For example, it has a transport mechanism that sends sludge) toward one end of the screw body. The screw body has screw-shaped blades fixed to the outer surface of the screw shaft arranged concentrically with the barrel. The screw-shaped blades are formed so that the pitch interval becomes narrower toward the outlet side. In this type of screw deflated machine, a filter medium covering the inner peripheral surface of the barrel is usually arranged at the time of use. As the filter medium, for example, a filter cloth is used. A large number of pores are formed in these filter cloths.

As the screw body rotates, the solid-liquid mixed raw material charged into the screw body is sent toward the end of the screw body. At this time, since the pitch interval of the screw body (that is, the passage of the solid-liquid mixed raw material) gradually narrows toward the outlet side, the solid-liquid mixed raw material is squeezed and deflated at the inner peripheral surface of the barrel and the screw shaft. To. As a result, the liquid is separated from the solid-liquid mixed raw material. The separated liquid passes through the filter medium and is discharged from a large number of liquid removal holes formed in the barrel. The raw material after the liquid is removed (that is, the solid matter after the liquid is removed, also called "cake") is discharged to the outside from the outlet of the screw body.

Japanese Unexamined Patent Publication No. 2011-1212697

In the technique of Patent Document 1, a filter cloth or the like is used as a filter medium. However, when a filter cloth or the like is used as a filter medium (for example, a filter medium arranged on the inner peripheral surface of a barrel in Patent Document 1), for example, in a situation where a solid-liquid mixed raw material is continuously squeezed and deflated, the liquid is removed. The later solidified raw material (cake) may block the pores of the filter medium, and efficient liquid removal may not be performed.

The present specification provides a technique capable of efficiently removing a liquid as compared with the case of using a conventional filter medium.

The filter medium disclosed in the present specification is formed in a planar shape, and has a first surface on the side where the solid-liquid mixed raw material to be filtered comes into contact, and a second surface which is the back surface of the first surface. It has a main body and a large number of drainage slits formed in the main body, and has the large number of drainage slits formed in parallel with each other in the longitudinal direction. The first surface is formed in a wavy uneven shape.

When filtering the solid-liquid mixed raw material using the above filter medium, the solid-liquid mixed raw material is charged to the first surface side of the main body. As the solid-liquid mixed raw material comes into contact with the first surface, the liquid contained in the solid-liquid mixed raw material is discharged to the second surface side through the liquid drain slit. In the above filter medium, an elongated liquid draining slit is formed in the main body. Therefore, as compared with the case where a filter cloth or the like is used as a filter medium, when the solid-liquid mixed raw material is continuously filtered, the liquid draining slit is less likely to be blocked by the solidified raw material (cake) after deliquescent. Further, since the first surface of the main body is formed in a wavy uneven shape, the cake after deliquescent is temporarily deposited on the surface of the first surface in the case of continuously filtering the solid-liquid mixed raw material. Even so, the cake layer is sheared (peeled) by the convex portion, and high filtration performance can be maintained. Further, since the first surface of the main body is formed in a corrugated uneven shape, the effective area used for filtration is wider than in the case where the first surface is formed flat. Therefore, by using the above-mentioned filter medium, the liquid can be removed more efficiently than when the conventional filter medium is used.

The main body includes a plurality of core materials which are elongated materials and a plurality of thin plate materials formed in an elongated plate shape, the plurality of core materials are arranged as warp threads, and the plurality of thin plate materials are arranged as weft threads. It has a plain weave structure. The large number of drainage slits are formed by gaps formed between the thin plate materials adjacent to each other in the longitudinal direction of the core material.

According to this configuration, the first surface of the main body of the filter medium is formed into a corrugated uneven shape by a plurality of thin plate members arranged as weft threads. Further, when the main body of the filter medium is viewed along the first surface (that is, when viewed in parallel with the first surface), the core material and the thin plate material arranged so as to alternately pass above and below the core material. As a result, a vertically oriented cavity (hereinafter sometimes referred to as a "vertical hole") that opens along the direction from the second surface to the first surface (that is, the height direction) is further formed. More specifically, when the main body of the filter medium is viewed along the surface of the first surface, one of the two adjacent thin plate materials passing under the core material and the top of the core material A vertical hole is formed between the other thin plate material and the core material that passes through in a direction orthogonal to the first surface. That is, according to this configuration, the main body is provided with a large number of vertical holes in addition to a large number of liquid drain slits formed by gaps formed between adjacent thin plate materials. The drainage slit is a lateral cavity that opens along the first surface, and the vertical hole is a vertical cavity that opens along the height direction (direction orthogonal to the first surface). That is, according to the above configuration, the main body of the filter medium is formed with a large number of holes for draining two types of liquids having different directions. Therefore, according to the above-mentioned filter medium, higher filtration efficiency can be realized as compared with the conventional filter medium.

In particular, when the solid-liquid mixed raw material is pressed against the filtration surface and squeezed, according to the above configuration, pressure is applied to the thin plate material arranged as the weft of the filter medium, so that the elastic characteristics (spring) of the thin plate material are provided. Due to the characteristic), the thin plate material is elastically deformed. As a result, the shape of the vertical hole is deformed. Further, even if the cake is deposited on the surface of the filter medium, the layer of the deposited cake is easily cracked and peeled off due to the shaking caused by the elastic deformation of the thin plate material. As a result, the occurrence of a situation in which the vertical hole and the drain slit are blocked by the cake is suppressed. Further, the swing amount of the thin plate material can be changed by changing the interval between the core materials. By changing the spacing between the core materials according to the raw material, it is possible to realize the amount of elastic deformation of the thin plate material suitable for the raw material (that is, the amount of gap between the thin plate materials, the shape of the vertical holes, the opening area, etc.). ..

The above filter medium is used as a filter medium when a solid-liquid mixed raw material is pressed against a filtration surface to squeeze a liquid, such as a filter medium arranged on the inner peripheral surface of a barrel of a screw type or spiral type liquid drainer. It is highly effective when it is used. For example, a general liquid remover is a cylindrical barrel (filtration cylinder), a spiral body (or screw body) arranged in the barrel, and a solid-liquid mixed raw material (a solid-liquid mixed raw material) that is charged into the spiral body by rotating the spiral body. For example, it has a transport mechanism that sends sludge) toward one end of the spiral body. The spiral body has a screw spiral member (for example, a member formed by molding a metal rod into a coil shape) fixed to the outer surface surface of a rotating shaft arranged concentrically with a barrel. The screw spiral member is formed so that the pitch interval becomes narrower toward the outlet side. A filter medium formed in a cylindrical shape is arranged on the inner peripheral surface of the barrel. When the above filter medium is used in the barrel of this type of liquid remover, the vertical holes may be arranged so as to face the transport direction (circumferential direction) of the solid-liquid mixed raw material transported in the spiral body. Therefore, an adhesive force (that is, a force to stick to the barrel) is applied to the solid-liquid mixed raw material transported in the spiral body. Therefore, the occurrence of a situation in which the solid-liquid mixed raw material transported in the spiral body rotates in the same body as the spiral body (so-called co-rotation) is suppressed. As a result, the traction force of the solid-liquid mixed raw material becomes high, and a high propulsive force acts when the solid-liquid mixed raw material is transported in the spiral body. Therefore, the filtration efficiency (liquid removal efficiency) becomes high. Further, when the solid-liquid mixed raw material is squeezed and deflated by the inner peripheral surface of the barrel and the rotating shaft, pressure is applied to the thin plate material arranged as the weft of the filter medium, so that the thin plate material elastically deforms and swings. As a result, the shape of the vertical hole may be deformed. As a result, even if cake is deposited on the surface of the filter medium, the layer of the deposited cake is easily cracked and peeled off. As a result, the occurrence of a situation in which the vertical hole and the drain slit are blocked by the cake is suppressed. Therefore, when the above-mentioned filter medium is used for the barrel of the liquid remover, the decrease in filtration efficiency (liquid drainage efficiency) is effectively suppressed when the solid-liquid mixed raw materials are continuously processed.

The end face in the width direction of each of the thin plate members may have a shape chamfered in an R shape along the thickness direction of each of the thin plate members.

According to this configuration, the height of the adjacent thin plates changes when the thin plates swing, and the arrangement angle of the adjacent thin plates changes as in the case where the filter media is formed in a cylindrical shape. In such cases, the end faces of adjacent thin plate members can be brought into contact with each other. Therefore, even when pressure is applied to the main body or the main body is deformed, it is possible to form a thin liquid draining slit that allows only the liquid to effectively pass through without the thin plate materials being entangled with each other. In addition, it is possible to suppress variations in the opening width of the liquid drain slit.

The main body is arranged so as to be overlapped with the first layer material including the first surface and the first layer material, and the second layer material including the second surface, the first layer material, and the first layer. It may have a plurality of support materials arranged between the two-layer material. The first layer material may be formed by arranging a plurality of first thin plate materials formed in the shape of an elongated plate side by side in the width direction side by side. The second layer material may be formed by arranging a plurality of second thin plate members formed in the shape of an elongated plate side by side in the width direction side by side. Each of the plurality of support members is an elongated member, and the longitudinal direction thereof is arranged in a direction orthogonal to the longitudinal direction of the plurality of first strip members and the plurality of second strip members, and their short sides thereof. They may be spaced apart from each other along the direction. One surface of each of the plurality of support materials is joined to the plurality of first thin plate materials constituting the first layer material, and the other surface of each of the plurality of support materials is the second layer material. The first thin plate material is joined to the plurality of second thin plate materials constituting the above, and each first thin plate material is arranged in the same direction as the facing second thin plate material, and the first support material is provided between two adjacent support members. It may be joined to the second thin plate material facing the one thin plate material. The large number of liquid drain slits may be formed by a gap formed between the adjacent first thin plate materials and a gap formed between the adjacent second thin plate materials. ..

According to this configuration, the drainage slit is formed by the gap formed between the adjacent first thin plate materials and the gap formed between the adjacent second thin plate materials. Each of the first thin plate materials constituting the first layer material of the main body of the filter medium has a portion joined to the support material and a portion joined to the second thin plate material facing each other, along the longitudinal direction. Form a wavy uneven shape. Therefore, the first surface of the main body of the filter medium (that is, the surface of the first layer material that comes into contact with the solid-liquid mixing raw material) is formed into a corrugated uneven shape by the plurality of first thin plate materials. Therefore, even when a filter medium having this configuration is used, liquid removal can be performed more efficiently than when a conventional filter medium is used.

The end face in the width direction of each of the first thin plate members may have a shape chamfered in an R shape along the thickness direction of each of the first thin plate members. The end face in the width direction of each of the second thin plate members may have a shape chamfered in an R shape along the thickness direction of each of the second thin plate members.

According to this configuration, the heights of the adjacent first and second thin plates change due to pressure applied to the main body, and the adjacent first and second thin plates are formed as if the filter medium is formed in a cylindrical shape. Even in a situation where the arrangement angles of the plate materials change, at least the end faces of the first thin plate materials that are adjacent to each other can be brought into contact with each other. Therefore, even when pressure is applied to the main body or the main body is deformed, a thin liquid draining slit is formed between the first and second thin plate materials so that only the liquid can effectively pass through. Can be done. In addition, it is possible to suppress variations in the opening width of the liquid drain slit.

The length of each of the first thin plate members in the width direction may be longer than the length of the opposite second thin plate material in the width direction.

According to this configuration, the opening width of the drain slit on the second surface is wider than the opening width on the first surface. That is, the opening width of the liquid drain slit widens from the first surface to the second surface. By widening the opening width of the liquid draining slit, the liquid separated from the solid-liquid mixed raw material is easily discharged from the first surface side to the second surface side. In particular, when the filter medium having this configuration is formed into a cylindrical shape to form the barrel of the above-mentioned liquid remover, this effect can be remarkably exhibited.

The thickness of the adjacent first thin plate members may be different from each other.

According to this configuration, unevenness is generated on the surface of the first surface in the direction orthogonal to the longitudinal direction of the first thin plate material. In particular, when the barrel of the above-mentioned liquid remover is formed by forming the filter medium having this structure into a cylindrical shape, unevenness may be formed on the inner peripheral surface of the barrel. By forming irregularities on the inner peripheral surface of the barrel, an adhesive force (that is, a force to stick to the barrel) is applied to the solid-liquid mixed raw material conveyed in the barrel. Therefore, the occurrence of a situation in which the solid-liquid mixed raw material transported in the spiral body rotates in the same body as the spiral body (so-called co-rotation) is suppressed. As a result, the traction force becomes high, and a high propulsive force acts when the solid-liquid mixed raw material is conveyed in the barrel. Therefore, the filtration efficiency (liquid removal efficiency) becomes high.

The main body may be a plate material formed in a corrugated shape that is uneven in the first direction. Each of the large number of drainage slits may be formed so that its longitudinal direction is along a second direction orthogonal to the first direction.

Even with this configuration, liquid removal can be performed more efficiently than when a conventional filter medium is used. Further, in this configuration, since the main body is a single plate material formed in a corrugated shape, the weight of the entire filter medium can be relatively lightened.

Each of the large number of drainage slits may be formed at the bottom of the concave portion of the corrugated unevenness on the first surface.

According to this configuration, since the liquid draining slit is formed at the bottom of the recess, which is the position where the solid-liquid mixed raw material in contact with the first surface is accumulated, relatively high filtration efficiency can be realized.

The plan view which shows the filter medium of 1st Example. The front view of the filter medium of FIG. FIG. 3 is a sectional view taken along line III-III of the filter medium of FIG. The schematic perspective view which shows the example of the case where the filter medium of FIG. The plan view which shows the filter medium of 2nd Example. The front view of the filter medium of FIG. FIG. 5 is a sectional view taken along line VII-VII of the filter medium of FIG. The side view which shows the filter medium of the 3rd Example (the modification of the 2nd Example). The side view which shows the filter medium of the 4th Example (the modification of the 3rd Example). The plan view which shows the filter medium of 5th Example. A side view of the filter medium of FIG. The side view which shows the example of the case where the filter medium of FIG. 10 is used for the barrel of a screw deliquesher.

(First Example)
The filter medium 2 of the first embodiment will be described with reference to FIGS. 1 to 3. As shown in FIGS. 1 to 3, the filter medium 2 of this embodiment is a filter medium used for separating a liquid and a solid from a solid-liquid mixed raw material such as sludge. Hereinafter, the solid-liquid mixed raw material may be simply referred to as a “raw material”.

The filter medium 2 of this embodiment includes a main body 4 formed entirely in a plate shape, and a large number of liquid draining slits 50 formed in the main body 4. The main body 4 has a front surface 10 on the side where the raw material to be filtered comes into contact, and a back surface 20 on the opposite side of the front surface 10. A large number of drainage slits 50 are formed in parallel with each other along the longitudinal direction of the filter medium 2 (the X-axis direction in the drawing). Further, as shown in FIG. 2, the front surface 10 and the back surface 20 have a shape of corrugated unevenness (that is, undulations) along the longitudinal direction (X-axis direction) of the filter medium 2.

As shown in FIGS. 1 and 2, the main body 4 includes a plurality of elongated plate-shaped strip members 30a to 30h and a plurality of elongated core members 40a to 40c. In FIG. 1, only eight thin plate materials 30a to 30h and three core materials 40a to 40c are shown, but the main body 4 uses a large number of thin plate materials and core materials (not shown). May be good. When the thin plate materials 30a to 30h are referred to without distinction, they may be simply referred to as "thin plate material 30". Similarly, when the core materials 40a to 40c are referred to without distinction, they may be simply referred to as "core material 40".

In this embodiment, the main body 4 has a plain weave structure in which a plurality of core members 40 are arranged as warp threads and a plurality of thin plate members 30 are arranged as weft threads. Plain weave may be called tatami weave. The structure of the main body 4 of this embodiment will be described in detail below.

In this embodiment, the core members 40a to 40c are arranged so that their longitudinal directions are along the Y-axis direction, which is the width direction of the filter medium 2. Then, the core materials 40a to 40c are arranged apart from each other with a predetermined interval in the X-axis direction. In the example of the figure, the core materials 40a to 40c are arranged in the order of the core materials 40a, 40b, and 40c in the positive direction in the X-axis direction. The thin plate members 30a to 30h are arranged so that their longitudinal directions are along the X-axis direction, which is the longitudinal direction of the filter medium 2. The thin plate members 30a to 30h are arranged side by side at close intervals so as to be closely adjacent to each other in the Y-axis direction. In the example of the figure, the thin plate members 30a to 30h are arranged in the order of the thin plate members 30h, 30g, 30f, 30e, 30d, 30c, 30b, 30a in the positive direction in the Y-axis direction.

Of the large number of thin plate members 30a to 30h, the thin plate members 30a, 30c, 30e, and 30g are the lower surface of the core material 40a (the surface on the negative direction side in the Z-axis direction) and the upper surface of the core material 40b (positive in the Z-axis direction). The surface on the directional side) and the lower surface of the core material 40c are arranged so as to be in contact with each other alternately. On the other hand, the thin plate members 30b, 30d, 30f, 30h arranged between the thin plate members 30a, 30c, 30e, and 30g are in contact with the upper surface of the core material 40a, the lower surface of the core material 40b, and the upper surface of the core material 40c alternately. Is placed in.

By arranging the thin plate material 30 and the core material 40 in this way, the main body 4 having a plain weave structure is completed. As a result, as described above, the front surface 10 and the back surface 20 of the main body 4 have a shape of corrugated unevenness (that is, undulations) along the longitudinal direction (X-axis direction) of the filter medium 2. As shown in FIG. 1, a large number of drainage slits 50 are formed by slightly formed gaps between the thin plate members 30a to 30h that are closely arranged in the Y-axis direction.

As shown in FIG. 2, since the main body 4 of the filter medium 2 of this embodiment has the above-mentioned plain weave structure, the core material 40 and the core material 40 are alternately passed above and below when the main body 4 is viewed from the front. A vertical hole (longitudinal cavity) 60 that opens along the height direction (that is, the Z-axis direction, which may be referred to as a direction orthogonal to the surface 10) is formed by the thin plate member 30 arranged in the above. That is, when focusing on two adjacent thin plate materials 30h and 30g, between the thin plate material 30g passing under the core material 40a, the thin plate material 30h passing over the core material 40a, and the core material 40a. A vertical hole 60 is formed in the hole 60. The same applies to the other two adjacent thin plate members 30 and the other core member 40. Each vertical hole 60 is formed on the left and right sides of each core member 40 in the X-axis direction. Each vertical hole 60 has a triangular opening shape.

That is, in this embodiment, in addition to the large number of liquid draining slits 50 formed between the adjacent thin plate members 30, a large number of vertical holes 60 are also formed in the main body 4. Of these, the liquid drain slit 50 is a lateral cavity that opens along the XY plane (that is, the front surface 10 and the back surface 20), and the vertical hole 60 is a vertical cavity that opens along the YZ plane. That is, in this embodiment, the main body 4 of the filter medium 2 is formed with a large number of holes for draining two types of liquids having different directions.

Further, as shown in FIG. 3, in the filter medium 2 of the present embodiment, the end faces of the thin plate members 30a to 30h arranged closely in the Y-axis direction in the width direction (Y-axis direction) are in the thickness direction of the thin plate member 30. It has an R-shaped chamfered shape along (Z-axis direction). In other words, the end faces of the thin plate members 30 on the XZ plane are chamfered in an R shape along the Z axis direction. It may be said that the end faces of the thin plate members 30 on the XX plane are formed in an arc shape along the Z-axis direction. In other words, the end face is rounded. A large number of liquid draining slits 50 are formed by the gaps formed slightly between the adjacent thin plate members 30a to 30h.

The configuration of the filter medium 2 of this embodiment has been described above. When filtering the raw material (which may be called liquid removal) using the filter medium 2 of this embodiment, the raw material is charged to the surface 10 side of the main body 4. As the raw material comes into contact with the front surface 10, the liquid contained in the raw material is discharged to the back surface 20 side through the liquid drain slit 50 and the vertical hole 60. In the filter medium 2 of this embodiment, an elongated liquid draining slit 50 is formed in the main body 4. Therefore, as compared with the case where a filter cloth or the like is used as a filter medium, the liquid draining slit 50 is less likely to be blocked by the solidified raw material (cake) after deliquescent when the raw material is continuously filtered. Therefore, there is an advantage that the filtration efficiency is unlikely to decrease even when the raw materials are continuously filtered.

Further, as described above, in the present embodiment, the main body 4 is also formed with a large number of vertical holes 60 having different orientations from those of the liquid drain slit 50. Since filtration can be performed by two types of holes for draining liquid having different orientations, higher filtration efficiency can be realized as compared with the conventional filter medium.

Further, the surface 10 of the main body 4 has a shape of corrugated unevenness (that is, undulations) along the longitudinal direction (X-axis direction) of the filter medium 2. Therefore, even if the cake after deliquescing is deposited on the surface 10 in the case of continuously filtering the raw material, the cake layer is sheared (peeled) by the convex portion of the surface 10 and the cake is formed. The situation of closing the drain holes (drain slit 50, vertical hole 60) is suppressed. As a result, high filtration performance is maintained. Further, since the surface 10 of the main body 4 is formed in a wavy uneven shape, the effective area used for filtration is wider than that of a filter medium having a flat surface. Therefore, by using the filter medium 2 of this example, the liquid can be removed more efficiently than when the conventional filter medium is used.

In particular, when the raw material is pressed against the surface 10 which is the filtration surface and is squeezed, the thin plate member 30 elastically deforms and swings when pressure is applied to the thin plate member 30 arranged as the weft of the filter medium 2. As a result, the shape of the vertical hole 60 is also deformed. Further, even if the cake is deposited on the surface 10 of the filter medium 2, the layer of the deposited cake is easily cracked and peeled off due to the shaking of the thin plate material 30. As a result, the situation where the vertical hole 60 and the drain slit 50 are blocked by the cake is effectively suppressed. Further, in the filter medium 2 of the present embodiment, the swing amount of the thin plate member 30 can be changed by changing the interval between the core members 40. By changing the spacing between the core materials 40 according to the raw material, the amount of elastic deformation of the thin plate material 30 suitable for the raw material (that is, the amount of gap between the thin plate materials 30, the shape of the vertical hole 60, the opening area, etc.) is realized. can do.

Further, as described above, in the filter medium 2 of the present embodiment, the end faces of the thin plate members 30a to 30h arranged densely in the Y-axis direction in the width direction (Y-axis direction) are in the thickness direction (Z-axis) of the thin plate members 30. It has an R-shaped chamfered shape along the direction) (see FIG. 3). Therefore, even in a situation where the heights of the adjacent thin plate members 30 change, such as when pressure is applied to the filter medium 2, the end faces of the thin plate members 30 come into contact with each other (FIG. 3). (Point contact) can be made from the viewpoint of. Therefore, even when pressure is applied to the main body 4, it is possible to form a thin liquid draining slit 50 between the thin plate members 30 so that only the liquid can effectively pass through. Further, it is possible to suppress the variation in the opening width of the liquid draining slit 50.

(Typical use example of filter media)
A typical use example of the filter medium 2 of this embodiment will be described with reference to FIG. When the filter medium 2 of the present embodiment is used as a filter medium when the raw material is pressed against the surface 10 which is the filtration surface and the liquid is squeezed from the raw material, the above-mentioned action and effect can be exhibited particularly effectively. .. For example, as shown in FIG. 3, the filter medium 2 can be used as the filter medium 2 formed in a cylindrical shape and arranged on the inner peripheral surface of the barrel 70 of the screw type or spiral type liquid drainer. In this type of deflated machine, a cylindrical barrel (filter cylinder) 70, a spiral body 80 (or a screw body) arranged in the barrel 70, and a spiral body 80 are rotated to be inside the barrel 70 (to be exact, the barrel 70). It has a transport mechanism (not shown) that sends the raw material charged into the screw body 80) toward the outlet side end portion 74 of the spiral body 80.

The barrel 70 is a tubular member formed in a cylindrical shape by a perforated plate such as a rigid punching metal. The barrel 70 can be divided into a first barrel member 70a and a second barrel member 70. The first barrel member 70a and the second barrel member 70b each have a shape in which the barrel 70 is divided in half along the axis of the barrel 70. By combining the first barrel member 70a and the second barrel member 70b, a cylindrical barrel 70 (see FIG. 4) is formed. One end of the barrel 70 is an inlet-side end 72 into which the raw material is charged, and the other end is the outlet-side end in which the raw material is conveyed in the transport direction and the cake after deliquescent is discharged. Part 74.

The spiral body 80 has a screw spiral member 84 (for example, a member formed by molding a metal rod into a coil shape) fixed to the outer surface surface of a rotating shaft 82 arranged concentrically with the barrel 70. The screw spiral member 84 is formed so that the pitch interval becomes narrower toward the outlet side.

As shown in FIG. 4, when the filter medium 2 of this embodiment is used for the barrel 70 for this type of liquid remover, the filter medium 2 is formed into a cylindrical shape so that the X-axis direction of FIG. 1 is the axial direction. Transform. At this time, molding is performed so that the front surface 10 with which the raw materials come into contact is the inner peripheral surface and the back surface 20 is the outer peripheral surface. The filter medium 2 deformed into a cylindrical shape is arranged on the inner peripheral surface of the barrel 70 (see FIG. 4). At this time, the core material 40 of the filter medium 2 is arranged in the circumferential direction, and the thin plate material 30 is arranged along the longitudinal direction (that is, the raw material conveying direction).

When the filter medium 2 of this embodiment is used for the barrel 70 of this type of liquid remover, the vertical hole 60 (see FIG. 2) faces the direction (circumferential direction) in which the raw material transported in the spiral body 80 is transported. Arranged to do. Therefore, an adhesive force (that is, a force that tends to stick to the surface 10 of the filter medium 2) is applied to the raw material conveyed in the spiral body 80. Therefore, the occurrence of a situation in which the raw material transported in the spiral body 80 rotates in the same body as the spiral body 80 (so-called co-rotation) is suppressed. As a result, the traction force of the raw material becomes high, and a high propulsive force acts when the raw material is conveyed in the spiral body 80. Therefore, the filtration efficiency (liquid removal efficiency) becomes high. Further, when the raw material is squeezed and deflated between the inner peripheral surface of the barrel 70, the screw spiral member 84, and the rotating shaft 82, pressure is applied to the thin plate material 30 arranged as the weft of the filter medium 2, so that the thin plate material is formed. 30 may be elastically deformed, and the shape of the vertical hole 60 may be deformed. As a result, even if cake is deposited on the inner peripheral surface of the barrel 70 (that is, the surface 10 of the filter medium 2), the layer of the deposited cake is easily cracked and peeled off. As a result, the situation where the vertical hole 60 and the liquid draining slit 50 are blocked by the cake is suppressed. Therefore, when the filter medium 2 of the present embodiment is used for the barrel 70 of the liquid remover, the decrease in filtration efficiency (liquid removal efficiency) is effectively suppressed even when the raw materials are continuously processed.

Further, when the filter medium 2 of this embodiment is used for the barrel 70 of this type of liquid remover, the thin plate material 30 is elastically deformed when pressure is applied by changing the opening diameter of the liquid drain hole of the barrel 70. The amount (which may be called the swing amount) can be changed. By changing the opening diameter according to the raw material to be squeezed, it is possible to realize the elastic deformation amount of the thin plate material 30 suitable for the raw material (the amount of gap between the thin plate materials 30, the shape of the vertical hole 60, the opening area, etc.). it can.

Further, as described above, in the filter medium 2 of the present embodiment, the end faces of the thin plate members 30a to 30h arranged densely in the Y-axis direction in the width direction (Y-axis direction) are in the thickness direction (Z-axis) of the thin plate members 30. It has an R-shaped chamfered shape along the direction) (see FIG. 3). Therefore, even in a situation where the arrangement angles of the adjacent thin plate members 30 change, as in the case where the filter medium 2 is formed into a cylindrical shape, the end faces of the thin plate members 30 can be brought into contact with each other (point contact from the viewpoint of FIG. 3). it can. Therefore, even when the main body 4 is deformed, it is possible to form a thin liquid draining slit 50 between the thin plate members 30 so that only the liquid can effectively pass through. Further, it is possible to suppress the variation in the opening width of the liquid draining slit 50.

The correspondence between this embodiment and the description of the claims will be described. The front surface 10 and the back surface 20 in this embodiment are examples of the "first surface" and the "second surface", respectively.

(Second Example)
The filter medium 102 of the second embodiment will be described with reference to FIGS. 5 to 7. The filter medium 102 of this embodiment also has a configuration in which a large number of drainage slits 150 and 152 are formed in a main body 104 having a front surface 110 and a back surface 120. Also in this embodiment, a large number of drainage slits 150 and 152 are formed in parallel with each other along the longitudinal direction of the filter medium 102 (the X-axis direction in the drawing). Further, as shown in FIG. 6, the front surface 110 and the back surface 120 have a shape of corrugated unevenness (that is, undulations) along the longitudinal direction (X-axis direction) of the filter medium 102. However, in this embodiment, the main body 104 has a two-layer structure of a first layer material 112 including the front surface 110 and a second layer material 122 including the back surface 120. A plurality of support members 140a to 140c and the like are arranged between the first layer material 112 and the second layer material 122. In the following, when the support members 140a to 140c are referred to without distinction, they may be simply referred to as "support member 140".

The first layer material 112 includes a plurality of first thin plate materials 130a to 130h formed in the shape of an elongated plate. The first thin plate members 130a to 130h are also members having an R shape on the end face (see FIG. 7). The first thin plate members 130a to 130h are arranged so that their longitudinal directions are along the X-axis direction, which is the longitudinal direction of the filter medium 102. The first thin plate members 130a to 130h are arranged side by side at close intervals so as to be closely adjacent to each other in the Y-axis direction. In the example of the figure, the first thin plate members 130a to 130h are arranged in the order of the first thin plate members 130h, 130g, 130f, 130e, 130d, 130c, 130b, 130a in the positive direction in the Y-axis direction. A large number of drainage slits 150 are formed by the gaps formed slightly between the first thin plate members 130a to 130h that are closely arranged in the Y-axis direction. In the following, when the first thin plate materials 130a to 130c are referred to without distinction, they may be simply referred to as "first thin plate material 130".

Similar to the first layer material 112, the second layer material 122 also includes a plurality of second thin plate materials 132a to 132h formed in the shape of an elongated plate. The second thin plate members 132a to 132h are also members having an R shape on the end face (see FIG. 7). In this embodiment, the first thin plate members 130a to 130h and the second thin plate members 132a to 132h are formed to have the same size (same length, width, and thickness). The second thin plate members 132a to 132h are arranged so that their longitudinal directions are along the X-axis direction, which is the longitudinal direction of the filter media 102. The second thin plate members 132a to 132h are arranged side by side at close intervals so as to be closely adjacent to each other in the Y-axis direction. In the example of the figure, the second thin plate members 132a to 132h are arranged in the order of the second thin plate members 132h, 132g, 132f, 132e, 132d, 132c, 132b, 132a in the positive direction in the Y-axis direction. A large number of drainage slits 152 are formed by the gaps formed slightly between the second thin plate members 132a to 132h that are closely arranged in the Y-axis direction. In the following, when the second thin plate members 132a to 132c are referred to without distinction, they may be simply referred to as "second thin plate material 132".

In this embodiment, the support members 140a to 140c are all arranged so as to be sandwiched between the first layer member 112 and the second layer member 122 in the height direction (Z-axis direction). The support members 140a to 140c are all arranged so that their longitudinal directions are along the Y-axis direction, which is the width direction of the filter medium 102. Then, the support members 140a to 140c are arranged apart from each other at a predetermined distance in the X-axis direction. In the example of the figure, the support members 140a to 140c are arranged in the order of the support members 140a, 140b, 140c in the positive direction in the X-axis direction.

In this embodiment, the first thin plate member 130a is arranged directly above the second thin plate member 132a in the height direction (Z-axis direction), and is arranged so as to overlap on the XY plane (see FIG. 7). Similarly, the other first thin plate members 130b to 130h and the second thin plate members 132b to 132b are arranged so as to overlap each other on the XY plane. Therefore, in this embodiment, the drainage slit 150 formed between the first thin plate members 130a to 130h and the drainage slit 152 formed between the second thin plate members 132a to 132h are formed. They are arranged so as to overlap on the XY plane.

Further, in this embodiment, the first thin plate member 130a is joined to the upper surfaces of the support members 140a, 140b, and 140c, respectively. The second thin plate member 132a corresponding to the first thin plate member 130a (that is, overlapping on the XY plane) is joined to the lower surfaces of the support members 140a, 140b, and 140c, respectively. Then, the first thin plate member 130a is directly joined to the corresponding second thin plate member 132a at the joining position 170 between the supporting members 140 in the longitudinal direction (X-axis direction). As a result, the heights of the first thin plate member 130a and the second thin plate member 132a change between the position where they are joined to each support member 140 and the joining position 170 between each support member 140. The first thin plate member 130a and the second thin plate member 132a are formed in a corrugated and uneven shape along the longitudinal direction.

The same applies to the other first thin plate members 130b to 130h, the other second thin plate members 132b to 132h, and the support members 140a to 140c. That is, the first thin plate members 130b to 130h are all joined to the upper surfaces of the support members 140a to 140c. The second thin plate members 132b to 132h are all joined to the lower surfaces of the support members 140a to 140c. The first thin plate members 130b to 130h are directly joined to the corresponding second thin plate members 132b to 132h at the joining position 170 between the supporting members 140 in the longitudinal direction (X-axis direction), respectively. As a result, the heights of the first thin plate members 130b to 130h and the second thin plate members 132b to 132h also change between the positions where they are joined to the support members 140 and the joining positions 170 between the support members 140. To do. The first thin plate members 130b to 130h and the second thin plate members 132b to 132h are also formed in a corrugated and uneven shape along the longitudinal direction.

Further, as shown in FIG. 7, in the filter medium 102 of the present embodiment, the end faces of the first thin plate members 130a to 130h arranged closely in the Y-axis direction in the width direction (Y-axis direction) are the first thin plate members. It has an R-shaped chamfered shape along the thickness direction (Z-axis direction) of 130. Similarly, the end faces of the second thin plate members 132a to 132h in the width direction (Y-axis direction) also have an R-shaped chamfered shape along the thickness direction (Z-axis direction) of the second thin plate members 132. A large number of liquid draining slits 150 are formed by the gaps slightly formed between the adjacent first thin plate members 130a to 130h, and are slightly formed between the adjacent second thin plate members 132a to 132h. A large number of drainage slits 152 are formed by the gaps formed.

By arranging each member as described above, the filter medium 102 of this embodiment is formed. As a result, as described above, the front surface 110 and the back surface 120 of the main body 104 have a shape of corrugated unevenness (that is, undulations) along the longitudinal direction (X-axis direction) of the filter medium 102. Then, the drainage slit 150 is formed by the gap formed between the adjacent first thin plate members 130, and the drainage slit 152 is formed by the gap formed between the adjacent second thin plate members 132. Will be done. Therefore, even when the filter medium 102 of the present embodiment is used, the liquid can be removed more efficiently than when the conventional filter medium is used, as in the case of the first embodiment. Further, when the filter medium 102 of the present embodiment is also used by being arranged on the inner peripheral surface of the barrel of the liquid remover like the filter medium 2 of the first embodiment, the above advantages can be effectively exhibited. it can.

As described above, in the filter medium 102 of the present embodiment, the end faces of the first thin plate members 130a to 130h arranged closely in the Y-axis direction in the width direction (Y-axis direction) are in the thickness direction of the first thin plate member 130 (Y-axis direction). It has an R-shaped chamfered shape along the Z-axis direction). Similarly, the end faces of the second thin plate members 132a to 132h in the width direction (Y-axis direction) also have an R-shaped chamfered shape along the thickness direction (Z-axis direction) of the second thin plate members 132. Therefore, also in this embodiment, as in the case where the height of the first thin plate member 130 and the second thin plate member 132 adjacent to each other changes due to the pressure applied to the main body 104, or when the filter medium 102 is formed in a cylindrical shape. Even in a situation where the arrangement angles of the adjacent first thin plate members 130 and the second thin plate members 132 change, at least the end faces of the first thin plate members 130 can be brought into contact with each other. Therefore, even when pressure is applied to the main body 104 or the main body 104 is deformed, a thin liquid that allows only the liquid to effectively pass between the first thin plate material 130 and the second thin plate material 132. The draft slits 150 and 152 can be formed. In addition, it is possible to suppress variations in the opening widths of the liquid drain slits 150 and 152.

The drainage slits 150 and 152 in this embodiment are examples of the "drainage slit" of the claim. The front surface 110 and the back surface 120 are examples of the "first surface" and the "second surface", respectively.

(Third Example)
The third embodiment is one of the modifications of the second embodiment. The filter medium 102 of this embodiment also has the same basic configuration as that of the second embodiment. With reference to FIG. 8, the filter medium 102 of this embodiment will be described focusing on the differences from the second embodiment. FIG. 8 is a cross-sectional view of the filter medium 102 of this embodiment as viewed from a cross section corresponding to VIII-VIII of FIG. As shown in FIG. 8, in this embodiment, the width (length in the Y-axis direction) of the second thin plate members 132a to 132h constituting the second layer material 122 is the first thin plate constituting the first layer material 112. It is smaller than the width of the plate material 130a to 130g. Along with this, in this embodiment, the opening width of the liquid draining slit 152 is larger than the opening width of the liquid draining slit 150.

That is, according to the filter medium 102 of this embodiment, the opening width of the liquid drain holes (liquid drain slits 150 and 152) widens from the front surface 110 to the back surface 120. By widening the opening width of the drain hole, the liquid separated from the raw material is easily discharged from the front surface 110 side to the back surface 120 side. In particular, when the filter medium 102 of this embodiment is formed into a cylindrical shape and arranged on the inner peripheral surface of the barrel of the above-mentioned liquid remover, the back surface 120 on which the liquid draining slit 152 is formed constitutes the outer peripheral surface. Since the opening width of the liquid draining slit 152 is further widened, this effect can be remarkably exhibited.

(Fourth Example)
The fourth embodiment is one of the modifications of the third embodiment. Therefore, the filter medium 102 of this embodiment also has the same basic configuration as that of the second embodiment. With reference to FIG. 9, the filter medium 102 of the present embodiment will be described focusing on the differences from the third embodiment. FIG. 9 is a cross-sectional view of the filter medium 102 of this embodiment as viewed from a cross section corresponding to IX-IX of FIG. As shown in FIG. 9, in this embodiment as well, as in the third embodiment, the width (length in the Y-axis direction) of the second thin plate members 132a to 132h constituting the second layer material 122 is the first layer. It is smaller than the width of the first thin plate members 130a to 130g constituting the material 112. Further, in this embodiment, the thickness (length in the Z-axis direction) of the first thin plate members 130a, 130c, 130e, 130g is thinner than the thickness of the adjacent first thin plate members 130b, 130d, 130f, 130h. That is, in this embodiment, the thicknesses of the adjacent first thin plate members 130 are different.

That is, according to the filter medium 102 of this embodiment, the surface 110 has irregularities in the width direction of the filter medium 102 (Y-axis direction, that is, the width direction of each first thin plate member 130). In particular, when the filter medium 102 of this embodiment is formed into a cylindrical shape to form the barrel of the above-mentioned liquid remover, unevenness is formed on the inner peripheral surface of the barrel formed by the surface 110. By forming irregularities on the inner peripheral surface of the barrel, an adhesive force (that is, a force to stick to the surface 110) is applied to the raw material transported in the spiral body. Therefore, the occurrence of a situation in which the raw material transported in the spiral body rotates in the same body as the spiral body (so-called co-rotation) is suppressed. As a result, the traction force becomes high, and a high propulsion force acts when the raw material is transported in the spiral body. Therefore, the filtration efficiency (liquid removal efficiency) becomes high.

(Fifth Example)
The filter medium 202 of the fifth embodiment will be described with reference to FIGS. 10 to 12. The filter medium 202 of this embodiment also has a configuration in which a large number of drainage slits 250 are formed in a main body 204 having a front surface 210 and a back surface 220. Also in this embodiment, the plurality of drainage slits 250 are formed in parallel with each other in the longitudinal direction along the longitudinal direction of the filter medium 202 (the X-axis direction in the drawing). However, as shown in FIG. 11, in this embodiment, the main body 204 is a plate material formed in a corrugated shape that is uneven in the width direction (Y-axis direction) of the filter medium 102. That is, in this embodiment, the front surface 210 and the back surface 220 are formed in a corrugated shape that is uneven in the width direction (Y-axis direction) of the filter medium 202.

As described above, also in this embodiment, the front surface 210 and the back surface 120 of the main body 204 have a shape of corrugated unevenness (that is, undulations) along the width direction (Y-axis direction) of the filter medium 202. A liquid draining slit 250 is formed in the main body 204. Therefore, even when the filter medium 202 of this example is used, liquid removal can be performed more efficiently than when the conventional filter medium is used, as in each of the above-mentioned examples.

In this embodiment, as shown in FIG. 10, a large number of drainage slits 250 are formed in a staggered arrangement on the XY plane. Therefore, it is possible to prevent the strength of the main body 204, which is a single plate material, from being lowered.

Further, as shown in FIG. 11, the liquid draining slit 250 is formed in the bottom portion of the concave portion of the corrugated unevenness on the surface 210. Since the liquid draining slit 250 is formed at the bottom of the recess, which is the position where the raw materials in contact with the surface 210 are accumulated, relatively high filtration efficiency can be realized.

Further, FIG. 12 schematically shows an example in which the filter medium 202 of this embodiment is formed in a cylindrical shape in order to be arranged on the inner peripheral surface of the barrel of the liquid remover. In this case, in the filter medium 202 formed in a cylindrical shape, the front surface 210 forms the inner peripheral surface, and the back surface 220 forms the outer peripheral surface. At this time, since each liquid draining slit 250 is formed at the bottom portion of the concave portion of the corrugated unevenness on the surface 210 (see FIG. 11), it is formed at the outermost peripheral portion of the cylindrical filter medium 202. .. In this type of liquid remover, the strongest pressing force is applied to the outermost peripheral portion of the cylindrical filter medium 202. Therefore, high filtration efficiency can be realized.

The width direction (Y-axis direction) of the filter medium 102 of this embodiment is an example of the "first direction", and the longitudinal direction (X-axis direction) of the filter medium 202 is an example of the "second direction".

Although the examples of the techniques disclosed in the present specification have been described in detail above, these are merely examples and do not limit the scope of claims. The techniques described in the claims include various modifications and modifications of the specific examples illustrated above. For example, the following modification may be included.

(Modification 1) In the above-mentioned fourth embodiment, the width of the second thin plate members 132a to 132h is smaller than the width of the first thin plate members 130a to 130h (see FIG. 9). However, in the modified example of the fourth embodiment, the width of the second thin plate members 132a to 132h may be the same as the width of the first thin plate members 130a to 130h.

(Modification 2) In the fifth embodiment described above, the drainage slit 250 is formed at the bottom of the concave portion of the corrugated unevenness on the surface 210. In the modified example of the fifth embodiment, if the drainage slit is formed along the longitudinal direction of the main body 204, the drainage slit is not limited to the bottom portion of the concave portion of the corrugated unevenness on the surface 210, and is located at another position. It may be formed (for example, the top portion of the convex portion).

(Modification 3) In the above-mentioned first embodiment, the core material 40 and the thin plate material 30 may be joined.

(Deformation Example 4) The liquid remover in which the filter media 2, 102, and 202 disclosed in each of the above embodiments are arranged on the inner peripheral surface of the barrel is a so-called screw type liquid remover. In that case, instead of the spiral body 80 shown in FIG. 3, a screw body in which screw blades are fixed around the shaft may be used.

(Modification 5) In the first embodiment described above, the end faces of the thin plate members 30a to 30h in the width direction (Y-axis direction) are chamfered in an R shape along the thickness direction (Z-axis direction) of the thin plate members 30. It has a shape (see FIG. 3). Not limited to this, in the modified example, the end faces of the thin plate members 30a to 30h in the width direction (Y-axis direction) may have a planar shape (the end faces may not be chamfered into an R shape). The same applies to the end faces of the first thin plate members 130a to 130h and the end faces of the second thin plate members 132a to 132h in the second to fourth embodiments.

The technical elements described herein or in the drawings exhibit their technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the techniques illustrated in this specification or drawings achieve a plurality of objectives at the same time, and achieving one of the objectives itself has technical usefulness.

2: Filter material 4: Main body 10: Front surface 20: Back surface 30a to 30h: Fine plate material 40a to 40c: Core material 50: Liquid drain slit 60: Vertical hole 70: Barrel 72: Inlet side end 74: Outlet side end 80: Spiral body 82: Rotating shaft 84: Screw spiral member 102: Filter material 104: Main body 110: Front surface 112: First layer material 120: Back surface 122: Second layer material 130a to 130h: First thin plate material 132a to 132h: Second thin plate material 140a to 140c: Support material 150, 152: Drainage slit 170: Joint position 202: Filter material 204: Main body 210: Front side 220: Back side 250: Drainage slit 270: Barrel

Claims (9)

It is a filter medium
A main body formed in a planar shape and having a first surface on the side where the solid-liquid mixed raw material to be filtered comes into contact, and a second surface which is the back surface of the first surface.
It has a large number of drainage slits formed in an elongated shape in the main body, and has the large number of drainage slits formed in parallel with each other in the longitudinal direction.
The first surface is formed in a wavy uneven shape.
Filter media. The main body includes a plurality of core materials which are elongated materials and a plurality of thin plate materials formed in an elongated plate shape, the plurality of core materials are arranged as warp threads, and the plurality of thin plate materials are arranged as weft threads. Has a plain weave structure
The filter medium according to claim 1, wherein the large number of liquid drain slits are formed by gaps formed between the thin plate materials adjacent to each other in the longitudinal direction of the core material. The filter medium according to claim 2, wherein the end face in the width direction of each of the thin plate members has a shape chamfered in an R shape along the thickness direction of each of the thin plate members. The main body
The first layer material including the first surface and
The second layer material including the second surface and the second layer material are arranged so as to be overlapped with the first layer material.
A plurality of support materials arranged between the first layer material and the second layer material,
Have and
The first layer material is formed by arranging a plurality of first thin plate materials formed in the shape of an elongated plate side by side in the width direction side by side.
The second layer material is formed by arranging a plurality of second thin plate materials formed in the shape of an elongated plate side by side in the width direction side by side.
Each of the plurality of support members is an elongated member, and the longitudinal direction thereof is arranged in a direction orthogonal to the longitudinal direction of the plurality of first strip members and the plurality of second strip members, and their short sides thereof. Arranged at intervals along the direction,
One surface of each of the plurality of support materials is joined to the plurality of first thin plate materials constituting the first layer material.
The other surface of each of the plurality of support members is joined to the plurality of second thin plate members constituting the second layer material.
Each first thin plate material is arranged in the same direction as the opposite second thin plate material, and is joined to the second thin plate material facing the first thin plate material between two adjacent support materials. And
The claim that the large number of liquid drain slits are formed by a gap formed between the adjacent first thin plate materials and a gap formed between the adjacent second thin plate materials. The filter medium according to 1. The end face in the width direction of each of the first thin plate members has a shape chamfered in an R shape along the thickness direction of each of the first thin plate members.
The filter medium according to claim 4, wherein the end face in the width direction of each of the second thin plate members has a shape chamfered in an R shape along the thickness direction of each of the second thin plate members. The filter medium according to claim 5, wherein the length of each of the first thin plate members in the width direction is longer than the length of the opposite second thin plate material in the width direction. The filter medium according to claim 5 or 6, wherein adjacent first thin plate materials have different thicknesses. The main body is a plate material formed in a corrugated shape that is uneven in the first direction.
The filter medium according to claim 1, wherein each of the large number of drainage slits is formed so that its longitudinal direction is along a second direction orthogonal to the first direction. The filter medium according to claim 8, wherein each of the large number of drainage slits is formed at the bottom of a concave portion of the corrugated unevenness on the first surface.

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