Air dispersion member and dry separation device

Abstract

This air dispersion member (4) is configured so that a sheet-shaped filter medium (42) is held between two porous plates (41). The air dispersion member (4) is provided with a bolt (44) and a nut (45) that bind the two porous plates (41) to each other and apply surface pressure to the filter medium (42) between the two porous plates (41).

Description

Air dispersion member and dry separation device

[0001] The present invention relates to an air distribution member and a dry separation device.

[0002] A dry separation apparatus is known that separates a processing object, which is composed of a mixture of multiple types of powder and granular materials having different densities, into individual components by utilizing the density differences among the components. For example, Patent Documents 1 and 2 describe dry separation apparatuses that include a fluidized bed and an air chamber disposed adjacent to and below the fluidized bed.

[0003] Furthermore, the dry separation devices described in Patent Documents 1 and 2 are equipped with a vibration means for vibrating the fluidized bed, and the fluidized bed is vibrated. When the fluidized bed is vibrated, the particles of the powder or granular material to be processed are vibrated. When the particles of the powder or granular material are vibrated, the fluidity of the particles of the powder or granular material increases, thereby facilitating separation of the material to be processed.

[0004] In these dry separation devices, an air dispersion member is placed between the air chamber and the fluidization tank to separate them. The material to be treated is placed in the fluidization tank, and pressurized air is supplied to the air chamber from the outside. The air supplied to the air chamber passes through the air dispersion member and flows into the fluidization tank. The material to be treated in the fluidization tank then flows within the fluidization tank due to the action of the air flowing in from the air chamber.

[0005] When the material to be treated in the fluidization tank flows within the fluidization tank, components of the material with lower density move to higher positions within the fluidization tank. Components with higher density move to lower positions within the fluidization tank. The fluidization tank is also equipped with multiple discharge ports, which are arranged in the height direction of the fluidization tank. Therefore, components with lower density are discharged from the discharge ports located at higher positions within the fluidization tank, and components with higher density are discharged from the discharge ports located at lower positions. In a dry separation device, the material to be treated is separated through roughly the above process.

[0006] The air dispersion member provided in the dry separation device is a planar member that distributes the air flowing from the air chamber to the fluidization tank so that the air flows evenly throughout the fluidization tank. Generally, sheet-shaped filter media such as nonwoven fabrics are used as air dispersion members, but sheet-shaped filter media alone lack mechanical strength, which results in the problem of laborious maintenance. To solve this problem, the dry separation device described in Patent Document 2 uses a metal perforated plate, commonly called a punched metal, as a reinforcing member to compensate for the lack of strength of the sheet-shaped filter media. More specifically, in the dry separation device described in Patent Document 2, a sheet-shaped filter media sandwiched between two perforated plates serves as the air dispersion member. In this air dispersion member, the two perforated plates and the filter media are mechanically integrated, making the air dispersion member easy to handle. This facilitates the manufacture and maintenance of the dry separation device.

[0007] JP 2016-168556 A JP 2021-171668 A

[0008] However, since perforated plates are generally manufactured through punching, some distortion remains in the out-of-plane direction.Therefore, when a sheet-like filter material is sandwiched between two perforated plates, a small but irregular gap occurs between the perforated plate and the sheet-like filter material.Therefore, a part of the air that flows between the two perforated plates may flow through this gap to an unexpected location.As a result, the flow rate or flow velocity of the air blown out from the opposite side of the air dispersion element may be uneven.In other words, the flow rate or flow velocity of the air blown out from the opposite side of the air dispersion element may be different for each small hole.In short, the flow rate or flow velocity of the air that flows out of the air dispersion element toward the fluidization tank may be large or small depending on the location of the air dispersion element.

[0009] If the flow rate or velocity of the air flowing out of the air dispersion member is uneven, the powder and granular material will rise in some areas of the fluidized bed and fall in others. This causes the powder and granular material to move up and down irregularly within the fluidized bed. As a result, at a certain height within the fluidized bed, an unacceptable level of mixing of multiple types of powder and granular material with different densities occurs. This causes the problem of multiple types of powder and granular material being discharged from a specific outlet. This reduces the separation accuracy of the dry separation device, resulting in the inability to adequately separate the materials being processed.

[0010] According to the research of the present inventors, the above phenomenon is more pronounced when the vibration means is operated to vibrate the fluidized bed. In other words, when the vibration means is operated to promote separation of the materials to be treated, the separation accuracy of the dry separation device is significantly reduced, resulting in the problem that the materials to be treated cannot be sufficiently separated.

[0011] The present invention has been made in consideration of the above circumstances, and aims to provide an air dispersion member that is composed of a sheet-like filter medium sandwiched between two perforated plates, and that is less likely to cause variation in the flow rate or flow velocity of the air passing through.

[0012] Another object of the present invention is to provide a dry separation device that is less susceptible to deterioration in separation accuracy due to variations in the flow rate or flow velocity of air passing through an air dispersion member.

[0013] In order to achieve the above object, the air dispersion member of the present invention is an air dispersion member that is constructed by sandwiching a sheet-like filter material between two perforated plates, and is provided with a fastening means that fastens the two perforated plates to each other and applies surface pressure to the filter material between the two perforated plates.

[0014] The air dispersion member according to the present invention may comprise a plurality of fastening means.

[0015] In the planar shape of the air dispersion member, the plurality of fastening means may be arranged in a lattice pattern.

[0016] The fastening means may be a bolt inserted into a through-hole passing through the air dispersion member and a nut screwed onto the bolt.

[0017] The fastening means may be a rivet inserted into a through hole passing through the air dispersion member.

[0018] The fastening means may be a pin that is inserted into a through hole that penetrates the air dispersion member and has both ends welded to the perforated plate for fixation.

[0019] The fastening means may be a linear member that stitches the two perforated plates together.

[0020] A dry separation apparatus according to a first aspect of the present invention comprises a fluidized bed into which a material to be treated is fed, an air chamber located below and adjacent to the fluidized bed and into which pressurized air is supplied from the outside, and any one of the air dispersion members described above located at the boundary between the fluidized bed and the air chamber to separate them.

[0021] The dry separation apparatus according to a second aspect of the present invention comprises a fluidized bed into which the material to be treated is fed, an air chamber located below and adjacent to the fluidized bed and into which pressurized air is supplied from the outside, and a flat air dispersion member composed of a sheet-like filter medium sandwiched between two perforated plates, which is positioned at the boundary between the fluidized bed and the air chamber to separate them, and further comprises an upper abutment member fixed to the fluidized bed and in contact with the upper surface of the air dispersion member, and a lower abutment member located directly below the upper abutment member and fixed to the air chamber and in contact with the lower surface of the air dispersion member.

[0022] The air dispersion element of the present invention has a fastening means for fastening two perforated plates together and applying a surface pressure to the filter material between the two perforated plates, so that even if irregular gaps occur between the perforated plates and the sheet-like filter material due to out-of-plane distortion remaining in the perforated plates, the gaps are eliminated.As a result, the occurrence of deviations in the flow rate or flow velocity of the air flowing into the fluidization tank through the air dispersion element is suppressed.

[0023] The dry separation apparatus according to the first aspect of the present invention includes the air dispersion member, which prevents imbalances in the flow rate or flow velocity of the air flowing into the fluidized bed, thereby improving the separation accuracy of the materials to be treated by the dry separation apparatus.

[0024] The dry separation apparatus according to the second aspect of the present invention includes an upper contact member and a lower contact member, and an air dispersion member is sandwiched between the upper and lower contact members. Therefore, even if irregular gaps occur between the perforated plate and the sheet-like filter material due to out-of-plane distortion remaining in the perforated plate, the gaps are eliminated. As a result, the occurrence of bias in the flow rate or flow velocity of the air flowing into the fluidized bed through the air dispersion member is suppressed. Therefore, the separation accuracy of the material to be treated by the dry separation apparatus is improved.

[0025] FIG. 2 is a side cross-sectional view showing the overall configuration of a dry separation apparatus according to an embodiment of the present invention. FIG. 3 is a perspective view of an air dispersion member included in the dry separation apparatus shown in FIG. 1. FIG. 2A is an arrow view of the air dispersion member as seen from the direction indicated by arrow B in FIG. 2A, showing an enlarged view of a portion of the air dispersion member. FIG. 3 is a cross-sectional view of the air dispersion member cut along the plane indicated by line CC' in FIG. 2B. FIG. 4 is a partial cross-sectional view showing, in accordance with FIG. 2C, another example of the fastening means included in the air dispersion member included in the dry separation apparatus shown in FIG. 1. FIG. 4 is a partial cross-sectional view showing, in accordance with FIG. 2C, another example of the fastening means included in the air dispersion member included in the dry separation apparatus shown in FIG. 1. FIG. 4 is a partial cross-sectional view showing, in accordance with FIG. 2C, another example of the fastening means included in the air dispersion member included in the dry separation apparatus shown in FIG. 1. FIG. 4 is a partial cross-sectional view showing, in accordance with FIG. 2C, another example of the fastening means included in the air dispersion member included in the dry separation apparatus shown in FIG. 1.

[0026] The configuration and operation of a dry separation apparatus according to an embodiment of the present invention and an air dispersion member provided in the dry separation apparatus will be described in detail below with reference to the drawings. Note that the same reference numerals are used in each drawing to designate the same or equivalent parts.

[0027] (Overall Configuration) Fig. 1 is a side cross-sectional view showing the configuration of a dry separation apparatus 1 according to an embodiment of the present invention. As shown in Fig. 1, the dry separation apparatus 1 includes a fluidization tank 2, an air chamber 3 below and adjacent to the fluidization tank 2, and an air dispersion member 4 disposed at the boundary between the fluidization tank 2 and the air chamber 3 to separate them.

[0028] As will be described later, the material to be treated, which is a mixture of powders and granular materials of different densities, is introduced into the fluidization tank 2. High-pressure air is supplied to the air chamber 3 from a high-pressure air source (not shown). The high-pressure air supplied to the air chamber 3 passes through the air dispersion member 4 and flows into the fluidization tank 2. As a result, the material to be treated introduced into the fluidization tank 2 flows within the fluidization tank 2. While flowing within the fluidization tank 2, components with lower densities within the material to be treated move to higher positions within the fluidization tank 2. Components with higher densities move to lower positions within the fluidization tank 2. As a result, the material to be treated is separated into components with lower and higher densities within the fluidization tank 2.

[0029] As shown in FIG. 1 , fluidization tank 2 has an inlet 5 and an outlet 6. The material to be treated is introduced into fluidization tank 2 through inlet 5. Two outlets 6 are located at the top and bottom of fluidization tank 2. The outlet 6 located at a higher position in fluidization tank 2 discharges low-density constituents of the material to be treated, while the outlet 6 located at a lower position in fluidization tank 2 discharges high-density constituents of the material to be treated. An exhaust port 7 is located at the top of fluidization tank 2. Excess air that does not flow out through outlet 6 is exhausted to the outside through exhaust port 7. A filter 8 is attached to exhaust port 7, and fine particles contained in the air exhausted to the outside through exhaust port 7 are captured and removed by the filter.

[0030] As shown in FIG. 1 , the dry separation apparatus 1 includes two vibrators 9. Each vibrator 9 includes a rotary motor (not shown) and an eccentric disk driven by the rotary motor. The two vibrators 9 are synchronized with each other and rotate in opposite directions. The direction of the vibration force can be changed by changing the phase difference between the rotation angles of the two vibrators 9. The vibration frequency can be changed by changing the rotation speed of the two vibrators 9. Alternatively, the magnitude of the vibration force can be changed by changing the eccentricity of the eccentric disk. In other words, by changing or adjusting the settings of the vibrators 9, the dry separation apparatus 1 can be vibrated at any frequency, with any vibration force, and in any direction. In this way, the vibrator 9 functions as a vibration means for vibrating the dry separation apparatus 1 at any frequency, with any vibration force, and in any direction.

[0031] (Air dispersion member) Figure 2A is a perspective view of the air dispersion member 4 provided in the dry separation apparatus 1, and Figure 2B is an arrow view of the air dispersion member 4 as seen from the direction indicated by arrow B in Figure 2A, showing an enlarged view of a part of the air dispersion member. Figure 2C is a cross-sectional view of the air dispersion member taken along the plane indicated by line CC' in Figure 2B.

[0032] The air dispersion member 4 is a flat plate-like member as shown in FIG. 2A, and as shown in FIG. 2C, is composed of two perforated plates 41 sandwiched between them and a sheet-like filter material 42. The perforated plate 41 is a flat metal plate with numerous small holes 43. The perforated plate 41 is manufactured by pressing a metal plate and is generally called a punched metal. The size of the small holes 43 is not particularly limited, but is generally selected from a range of 1 mm to 10 mm in diameter. The number of small holes 43 provided in the perforated plate 41 is determined through calculation or experimentation to ensure sufficient fluidity of the material to be treated. The filter material 42 is a member that distributes the air flowing from the air chamber 3 to the fluidization tank 2 throughout the fluidization tank 2. The mesh size of the filter material 42 is selected to achieve the desired dispersion effect. In many cases, woven fabric, nonwoven fabric, or paper, i.e., a fibrous material, is selected for the filter material 42, but a fine-mesh wire mesh may also be used.

[0033] As shown in Figures 2A and 2B, the air dispersion member 4 has a plurality of through-holes formed therethrough, and a bolt 44 is inserted into each of the plurality of through-holes. As shown in Figure 2A, the plurality of bolts 44 are arranged in a grid pattern over a wide area of ​​the planar shape of the air dispersion member 4, excluding the peripheral edge. As shown in Figure 2C, two nuts 45, 45 are threaded onto the bolts 44, forming a so-called double nut. A washer 46 is sandwiched between the nuts 45 and the air dispersion member 4.

[0034] In the configuration shown in Figure 2C, when the nuts 45 are tightened, the air dispersion member 4 is sandwiched and compressed between the bolts 44 and nuts 45. As a result, the two perforated plates 41 that make up the air dispersion member 4 are fastened together. In other words, the bolts 44 and nuts 45 function as fastening means for fastening the two perforated plates 41 together. In addition, by fastening the two perforated plates 41 together, a surface pressure acts on the filter medium 42.

[0035] In this way, by providing the air dispersion member 4 with the bolts 44 and nuts 45, that is, by providing a fastening means, the two perforated plates 41 are fastened together. Therefore, even if the perforated plate 41 has some distortion in the out-of-plane direction, the distortion is corrected. Furthermore, since the filter medium 42 receives surface pressure from the perforated plate 41, the filter medium 42 is tightly attached to the perforated plate 41. As a result, the small gap between the perforated plate 41 and the filter medium 42 is almost completely eliminated.

[0036] When the small gaps between the perforated plates 41 and the filter medium 42 are almost completely eliminated, air that flows into the air dispersion member 4 through the small holes 43 in one perforated plate 41 flows through the gaps and no longer flows out from small holes 43 in unexpected locations on the opposite perforated plate 41. As a result, the flow rate or flow speed of air flowing out from the opposite perforated plate 41 does not vary depending on the location, so air that flows into the air dispersion member 4 through the small holes 43 in one perforated plate 41 flows out from small holes 43 in the opposite perforated plate 41 directly behind the original small holes 43. Therefore, air that flows in from one side of the air dispersion member 4 flows out evenly on the opposite side of the air dispersion member 4.

[0037] Because the air dispersion member 4 functions as described above, when the dry separation apparatus 1 is equipped with this air dispersion member 4, the air flowing into the fluidized bed 2 through the air dispersion member 4 flows uniformly and rises in the fluidized bed 2. As a result, the powdered or granular material to be treated that is introduced into the fluidized bed 2 is distributed in layers according to its density. That is, powdered or granular material with a low density is distributed in the upper layer of the fluidized bed 2, and powdered or granular material with a high density is distributed in the lower layer of the fluidized bed 2, preventing powdered or granular material with different densities from being mixed at the same height within the fluidized bed 2. As a result, the separation accuracy of the dry separation apparatus 1 is improved. That is, the uniformity of the powdered or granular material discharged through each of the discharge ports 6 is improved.

[0038] Furthermore, since the air dispersion member 4 is configured by sandwiching the filter material 42 between two perforated plates 41, the filter material 42 is stably held by the perforated plates 41. In other words, the filter material 42 is less likely to fall off. Furthermore, since the powder and granular material is less likely to come into direct contact with the filter material 42, the filter material 42 is less likely to wear out. In this way, the air dispersion member 4 also has excellent mechanical durability.

[0039] (Another Example of Fastening Means) The fastening means provided in the air dispersion member 4 are not limited to the bolts 44 and nuts 45. The fastening means can be variously modified as long as it can fasten the two perforated plates 41 constituting the air dispersion member 4 together and apply surface pressure to the filter medium 42. For example, as shown in FIG. 3A, a rivet 47 may be inserted into the air dispersion member 4, and the tip of the rivet 47 protruding from the opposite surface of the air dispersion member 4 may be crimped. In this case, the rivet 47 functions as the fastening means. Alternatively, as shown in FIG. 3B, instead of the rivet 47, a pin 48 may be inserted into the air dispersion member 4 and fixed by welding the pin 48 to the perforated plate 41. In this case, the influence of heat generated during welding becomes an issue, but this does not pose any particular problem when a fine-mesh wire mesh is used as the filter medium 42. 3C, an adhesive 49 may be impregnated into a portion of the filter medium 42, and the two porous plates 41 may be bonded to each other by the adhesive 49. In this case, the adhesive 49 functions as a fastening means.

[0040] Alternatively, as shown in FIG. 3D , two perforated plates 41 may be bound together with an upper thread 50 and a lower thread 51. In this case, the upper thread 50 and the lower thread 51 function as fastening means. Furthermore, in the configuration shown in FIG. 4 , the upper thread 50 and the lower thread 51 are sufficient as long as they are linear members that function similarly to the binding threads, and there are no limitations on the material and mechanical configuration. The upper thread 50 and the lower thread 51 may be manufactured by twisting or knitting fibers. The upper thread 50 and the lower thread 51 may be manufactured by twisting or knitting metal wires. The upper thread 50 and the lower thread 51 may be simple metal wires. The upper thread 50 and the lower thread 51 may also be a composite material made of fibers and metal wires.

[0041] (Another Configuration Example of the Dry Separation Apparatus 1) In the above, an example was shown in which the problem of the present invention is solved by providing the air dispersion member 4 with fastening means typified by the bolts 44 and nuts 45, but the means for solving the problem of the present invention are not limited to this. As shown below, the problem can also be solved by making changes to the fluidization tank 2 or the air chamber 3 of the dry separation apparatus 1.

[0042] 4A is a side cross-sectional view showing another configuration example of the dry separation apparatus 1, and FIG. 4B is a cross-sectional view of the dry separation apparatus 1 cut along the plane indicated by line BB' in FIG. 4A. As shown in FIGS. 4A and 4B, the dry separation apparatus 1 according to this configuration example includes an upper abutment member 52 fixed to the fluidized bed 2 and abutting the upper surface of the air dispersion member 4, and a lower abutment member 53 located directly below the upper abutment member 52, fixed to the air chamber 3, and abutting the lower surface of the air dispersion member 4. As such, the dry separation apparatus 1 according to this configuration example includes the upper abutment member 52 and the lower abutment member 53, and the air dispersion member 4 is sandwiched and compressed between the upper abutment member 52 and the lower abutment member 53. Therefore, even if out-of-plane distortion remains in the perforated plate 41 (not shown in FIG. 4) and a gap occurs between the perforated plate 41 and the filter medium 42 (not shown in FIG. 4), the gap is crushed. As a result, the deviation in the flow rate or flow velocity of the air flowing out from the air dispersion member 4 caused by the presence of the gap is eliminated, and the separation accuracy of the material to be treated by the dry separation device 1 is improved.

[0043] As described above, the air dispersion member 4 or dry separation apparatus 1 can prevent gaps from forming between the perforated plates 41 and the filter media 42 in the air dispersion member 4, which is configured by sandwiching the sheet-like filter media 42 between two perforated plates 41. This prevents variations in the flow rate or flow velocity of the air passing through the air dispersion member 4, which would otherwise be caused by the presence of such gaps. This also prevents turbulence in the air flow within the fluidization tank 2. As a result, the separation accuracy of the materials to be treated by the dry separation apparatus 1 is improved.

[0044] Furthermore, as mentioned above, the turbulence of the air flow in the fluidization tank 2 caused by the gap between the perforated plate 41 and the filter medium 42 is particularly pronounced in a dry separation apparatus 1 equipped with a vibrator 9, i.e., a vibrating means. Therefore, the above-mentioned effect is also particularly pronounced in a dry separation apparatus 1 equipped with a vibrating means.

[0045] The technical scope of the present invention is not limited to the above-described embodiments, and the present invention can be freely applied, modified, or improved within the scope of the technical concept described in the claims.

[0046] For example, the mechanical configuration, shape, number, and arrangement of the fastening means provided in the air dispersion member are not limited to those exemplified above, and can be freely modified or designed as long as the function of fastening two perforated plates together and applying surface pressure to the filter medium between the two perforated plates is achieved.

[0047] Similarly, the fastening means can be freely modified or designed as long as it achieves the function of fastening two perforated plates together and applying surface pressure to the filter material between the two perforated plates.

[0048] In the above example, the upper end of the upper contact member 52 is fixed to the top plate of the fluidizing tank 2. However, the upper contact member of the present invention need only be fixed to any part of the fluidizing tank, and is not limited to being fixed to the top plate of the fluidizing tank. The upper contact member of the present invention may also be fixed to, for example, a side plate of the fluidizing tank.

[0049] In the above, an example was shown in which the lower end of the lower contact member 53 is fixed to the bottom plate of the air chamber 3, but the lower contact member according to the present invention is not limited to being fixed to the bottom plate of the air chamber, and it is sufficient if it is fixed to any part of the air chamber. The lower contact member according to the present invention may also be fixed to, for example, a side plate of the air chamber.

[0050] Furthermore, although punched metal has been cited above as a specific example of a porous plate, the porous plate is not limited to punched metal. The material of the porous plate is not limited to metal. The porous plate may be made of a non-metallic material, for example, ceramic, synthetic resin, or composite material. The means for forming holes in the porous plate is not particularly limited. The holes may be formed by press working, drilling with a drill, or laser processing. The shape of the holes in the porous plate is also not limited. The shape of the holes may be a perfect circle, an ellipse, a polygon, or any other shape.

[0051] Furthermore, the material, mechanical structure, and mechanical properties of the sheet-shaped filter medium are not limited, and in other words, in the present invention, the sheet-shaped filter medium can be selected arbitrarily.

[0052] It goes without saying that in practicing the present invention, components not exemplified above can be added to the air distribution member or dry separation device.

[0053] Although the above example shows an example in which discharge ports 6 are provided at two locations, one above and one below, the dry separation apparatus of the present invention is not limited to a configuration in which discharge ports are provided at two locations, one above and one below, of the fluidized bed. Discharge ports may be provided at three or more locations. Furthermore, the height of the inlet 5 or discharge port 6 in the fluidized bed 2 shown in Figures 1 and 4 is merely an example, and the height of the inlet or discharge port in the fluidized bed of the dry separation apparatus of the present invention is not limited to that shown in Figures 1 and 4.

[0054] Furthermore, in the above description, a dry separation apparatus 1 equipped with a vibrator 9 was exemplified, and it was explained that the present invention is particularly required in a dry separation apparatus equipped with a vibrating means. However, the application of the present invention is not limited to a dry separation apparatus equipped with a vibrating means or to an air dispersion member constituting such a dry separation apparatus. In other words, the present invention can be applied to a dry separation apparatus not equipped with a vibrating means, or to an air dispersion member constituting a dry separation apparatus not equipped with a vibrating means. In this case, too, the present invention can improve the separation accuracy of the material to be processed by the dry separation apparatus.

[0055] The present invention allows various embodiments and modifications without departing from the broad spirit and scope of the present invention. Furthermore, the above-described embodiments are intended to explain the present invention and do not limit the scope of the present invention. That is, the scope of the present invention is defined by the claims, not the embodiments. Various modifications made within the scope of the claims and the meaning of the disclosure equivalent thereto are considered to be within the scope of the present invention.

[0056] This application is based on Japanese Patent Application No. 2024-018351, filed on February 9, 2024. The entire specification, claims, and drawings of Japanese Patent Application No. 2024-018351 are incorporated herein by reference.

[0057] The air dispersion member according to the present invention is useful as a component of a dry separation device that uses multiple types of powder and granular materials with different densities as components and separates a processing object formed by mixing the components into individual components by utilizing the density differences between the components.The dry separation device according to the present invention is useful as a dry separation device that uses multiple types of powder and granular materials with different densities as components and separates a processing object formed by mixing the components into individual components by utilizing the density differences between the components.

[0058] REFERENCE SIGNS LIST 1 Dry separation device, 2 Fluidization tank, 3 Air chamber, 4 Air dispersion member, 5 Inlet, 6 Outlet, 7 Exhaust port, 8 Filter, 9 Vibrator, 41 Perforated plate, 42 Filter material, 43 Small holes, 44 Bolt, 45 Nut, 46 Washer, 47 Rivet, 48 Pin, 49 Adhesive 50 Upper thread, 51 Lower thread, 52 Upper contact member, 53 Lower contact member

Claims

1. An air dispersion member constructed by sandwiching a sheet-like filter medium between two perforated plates, characterized in that it comprises a fastening means for fastening the two perforated plates together and applying surface pressure to the filter medium between the two perforated plates.

2. The air dispersion member according to claim 1, comprising a plurality of said fastening means.

3. The air dispersion member according to claim 2, wherein a plurality of said fastening means are arranged in a lattice pattern in the plan view of said air dispersion member.

4. An air dispersion member according to claim 1, characterized in that the fastening means is a bolt inserted into a through hole passing through the air dispersion member and a nut screwed onto the bolt.

5. An air dispersion member according to claim 1, characterized in that the fastening means is a rivet inserted into a through-hole passing through the air dispersion member.

6. An air dispersion member according to claim 1, characterized in that the fastening means is a pin that is inserted into a through hole that penetrates the air dispersion member and has both ends welded to the perforated plate for fixation.

7. An air dispersion member according to claim 1, characterized in that the fastening means is a linear member that stitches the two perforated plates together.

8. A dry separation apparatus comprising: a fluidization tank into which a material to be treated is fed; an air chamber located below and adjacent to the fluidization tank and into which pressurized air is supplied from the outside; and an air dispersion member according to any one of claims 1 to 7 located at the boundary between the fluidization tank and the air chamber to separate them.

9. A dry separation apparatus comprising: a fluidization tank into which a material to be treated is fed; an air chamber located below and adjacent to the fluidization tank and into which pressurized air is supplied from the outside; and a flat air dispersion member composed of a sheet-like filter medium sandwiched between two perforated plates, the air dispersion member being positioned at the boundary between the fluidization tank and the air chamber to separate them, characterized in that it comprises: an upper abutment member fixed to the fluidization tank and in contact with the upper surface of the air dispersion member; and a lower abutment member located directly below the upper abutment member, fixed to the air chamber and in contact with the lower surface of the air dispersion member.

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