JP2019081167A - Disk and dispenser - Google Patents

Abstract

To provide a disk used for a dispenser more improved than conventional in dispersion performance, and the dispenser.SOLUTION: A dispersion disk 4 comprises 10 nearly trapezoidal metallic thin projection pieces 41 nearly circular to extend in a radial outside direction in the outer peripheral part. The projection piece 41 is constituted of a first side 41a obliquely extending in a radial outside direction in a downstream direction in a disk rotation direction α, a second side 41b extending from the first side 41a in a downstream direction and in a circumferential direction, and a third side 41c extending from the second side 41b in a disk center direction. Further, the first side 41a and the second side 41b are gently curved, which are smoothly continuous. Adjacent projection pieces 41 keep the third side 41c of one projection piece 41 smoothly continuous with the first side 41a of the other projection piece 41.SELECTED DRAWING: Figure 2A

Description

  The present invention relates to a disc used in a media type disperser and a disperser including the same.

  The dispersing machine is an apparatus for dispersing the object to be dispersed, and is also referred to as a stirrer, a kneader, or a mill, and is an apparatus for dispersing, stirring, and kneading the object to be dispersed. There are various types of dispersing machines. For example, a roller-type disperser that presses a dispersion target with several rollers, a disperser that disperses particles by causing them to collide with compressed gas, and a plurality of disks provided with pins and protrusions around the periphery to disperse A rotating type dispersing machine, and a media type dispersing machine that contains a large number of media and disperses them by the collision and shear force.

  In addition, in a rotary type dispersing machine using a plurality of disks, there are also dispersing machines filled with a large number of media. For example, a patent of the applicant of the present application has been published regarding the disc of such a disperser (agitator) and the stirrer provided with the disc (for example, Patent Document 1).

  The stirring disk 2 of Patent Document 1 has a notch groove 22 extending to the downstream side in the disk rotation direction α from the inner portion from the disk outer circumference C1 in the disk outer peripheral portion 21 and opening to the disk outer circumference circle C1. A plurality of media passage through holes 23 are provided in a portion radially inward of 22 (see FIG. 3 of Patent Document 1). Then, by using this disk for a stirrer, it is intended to uniformly disperse the highly viscous treated fluid, to secure a sufficient momentum of the medium, and to perform a desired treatment.

Patent No. 3830194

  However, there is a demand to improve the dispersion performance more than the above-mentioned Patent Document 1. Therefore, the inventors of the present application intensively studied about a disk and a dispersing machine with improved dispersing performance as compared with the prior art, and reached the present invention.

  When the inventors tested and studied, it was found that in the disk of Patent Document 1, the notched grooves 22 do not greatly contribute to the dispersion. Specifically, the curved portion A at the root of the notch groove 22 does not contribute so much, and the acute angle portion of the disk outer peripheral portion 21 constituting the notch groove 22 is the oblique side portion of the adjacent disk outer peripheral portion 21 It was found that a portion C of B was covered, which was an obstruction to the oblique side B contributing to dispersion (see FIGS. 11 and 12).

  The present invention has been made in view of the above problems, and it is an object of the present invention to provide a disk and a disperser which are used in a disperser in which the dispersion performance is improved as compared with the prior art.

  A disk according to one aspect of the present invention is a disk for use in a media type dispersing machine, comprising a plurality of protrusions extending radially outward at the outer peripheral portion of the disk, wherein the shape of the protrusions is approximately It has a trapezoidal shape, and the number of the projecting pieces is in the range of 1/15 or more and less than 1/5 of the disk outer diameter [mm].

  According to this configuration, since the shape of the projecting pieces is substantially trapezoidal, one projecting piece does not cover other projecting pieces as in the conventional disc shown in paragraph 0007 (see symbol C), The part contributing to dispersion is effectively exposed, and the dispersion performance is greatly improved. Also, with this shape, the number of protrusions can be increased as compared with the conventional one, and the dispersion performance is improved.

  Further, with respect to the shape of the projecting piece, the disc has a first side extending obliquely in the downstream direction and the radially outer direction in the disc rotation direction, and a second side extending in the downstream direction and the circumferential direction from the first side. And a third side extending from the second side toward the center of the disc.

  According to this configuration, since the first side obliquely extends in the downstream direction and the radially outer direction in the disc rotation direction and the second side extends in the downstream direction and the circumferential direction, when the disc is rotated, The first side and the second side which contribute to the dispersion act to disperse the object to be dispersed effectively. In addition, since the third side extends from the second side toward the center of the disc, the third side is effective without covering the adjacent first side.

  Further, in the disc, the first side and the second side are smoothly continued. Further, the first side and the second side are curved. According to this configuration, it is possible to make the first side and the second side more effective in dispersion than in the case of being connected at an acute angle.

  Further, in the disc, the first side and the second side are curved. According to this configuration, the distance between the first side and the second side can be longer in dispersion than in the case where the first side and the second side are straight lines.

  Further, in this disk, the third side of the adjacent first protrusion and the first side of the second protrusion smoothly continue. According to this configuration, the third side of the first projecting piece and the first side of the second projecting piece can be dispersed more effectively than in the case of being connected at an acute angle.

  Further, the disc further includes a plurality of through holes through which the medium passes, and the through holes are through holes penetrating in the width direction of the disc. According to this configuration, dispersion is promoted particularly in the case of a high viscosity or high concentration dispersion target, because the passage cross-sectional area of the dispersion target is increased due to the presence of the through holes.

  Further, in the disk, the through hole obliquely penetrates in the same direction as the disk rotation direction from the upper surface to the lower surface of the disk. According to this configuration, the through hole obliquely penetrates in the same direction as the disc rotation direction, so that the dispersion target or medium flowing downstream from the outside of the disc is returned from the lower surface side to the upper surface side of the through hole. Thus, the time and distance for dispersing the dispersion target is increased, and the media circulates in the container to promote dispersion. In particular, it is suitable when the object to be dispersed has high viscosity. In the case where the object to be dispersed has a low viscosity, the through holes may be straight holes on a straight line from the upper surface to the lower surface of the disc.

  Further, in the disc, the through hole is disposed at a position closer to the projection than the center of the disc. According to this configuration, when the disc is rotated, the medium is provided radially outward of the disc due to the centrifugal force, and the through hole is provided at the outside of the disc, for example, at a position slightly offset from the protrusion to the disc center side This enables effective dispersion.

Further, in this disk, the number X of the through holes and the number Y of the protruding sides satisfy the following Equation 1. According to this configuration, the number of through holes is in a predetermined range, the shear performance is high, and the through holes through which the medium passes smoothly. Specifically, if the number of through holes is large, the shear performance is improved, but if it is too large, the area of the through holes becomes small and the passage of media is impeded, the number of through holes being within the above range The shear performance is high, and the number and area of through holes through which the media passes smoothly are the same.
X ≦ Y (Equation 1)

Further, the disc has a distance D2 between the centers of the through holes facing the center of the disc, an outer diameter D1 of the disc, a radius of curvature R1 of the first side of the projecting side, and The distance W1 between the center of curvature of the first side and the center of the disk satisfies the following Equations 2 to 4. According to this configuration, the shear performance is higher than that of the conventional disk, and the medium passes smoothly.
0.65 ≦ D2 / D1 ≦ 0.80 (Equation 2)
0.40 ≦ R1 / D1 ≦ 0.55 (Equation 3)
0.15 ≦ W1 / D1 ≦ 0.30 (Expression 4)

  The disperser according to one aspect of the present invention includes the disk having the above-described configuration, a rotatable shaft to which a plurality of the disks are attached at intervals, a container covering the disk and the shaft, and the container. And media to be filled. According to this configuration, the dispersing performance of the dispersing machine is improved as compared with the conventional one.

  According to the disk and the disperser of the present invention, the dispersion performance is improved as compared with the prior art.

It is a sectional view showing a schematic structure of a dispersing machine concerning one embodiment of the present invention. FIG. 2 shows a disc according to an embodiment of the present invention. It is a figure which shows each dimension of the disc concerning one Embodiment of this invention. It is a figure which shows the modification of the disc concerning one Embodiment of this invention. It is a figure which shows the modification of the disc concerning one Embodiment of this invention. It is a figure which shows the modification of the disc concerning one Embodiment of this invention. FIG. 1 shows a disc according to an embodiment of the present invention and a conventional disc. It is a figure which shows the passage cross section of the dispersion | distribution target object of the disc outer peripheral part in the disperser concerning one Embodiment of this invention. It is a table | surface which shows the passage cross-sectional area of the dispersion | distribution target object of a disk outer peripheral part which compared the disk concerning one Embodiment of this invention, and the conventional disk. It is a comparison test result, and is a table | surface which shows the impact shear frequency. It is a comparison test result, and is a figure which shows the relationship between input power and a particle diameter. It is a comparison test result, and is a figure which shows the relationship between dispersion time and a particle diameter. It is a comparison test result, and is a figure which shows the relationship between pressure and flow volume. It is a figure which shows the conventional disk. It is a figure which shows the abrasion test result of the conventional disk.

<1. Overall structure of dispersing machine>
Hereinafter, although the disperser of one embodiment according to the present invention will be described, the present invention is not limited to the following embodiment. FIG. 1 is a cross-sectional view showing a schematic configuration of a dispersing machine of the present embodiment. FIG. 2 is a view showing a dispersing disk used in the dispersing machine of the present embodiment.

  As shown in FIG. 1, the dispersing machine 1 mainly includes a container 2, a shaft 3 axially extending inside the container 2, and a plurality of dispersing disks 4 arranged in a row and fixed thereto. Further, a large number of media are filled in the container 2. In this embodiment, zirconia beads of φ 2 mm are used as an example of the medium. In addition, the bead used for this embodiment is an example, and it is sufficient to use a bead whose specific gravity and diameter are larger than that of the object to be dispersed. Further, the beads are appropriately selected according to the type of the dispersion object, the hardness of the particles, the particle diameter, the viscosity, the specific gravity, and the like. In addition, beads are an example of media, and media other than beads may be used.

 The container 2 is a substantially sealed cylindrical container having side walls 21 and 22 at both ends. The shaft 3 is inserted into an opening 23 provided in one side wall 21 of the container 2, extends to the vicinity of the other side wall 22, and is rotatably cantilevered by a bearing device (not shown) provided outside the container 2. It is supported. A motor (not shown) is connected to the bearing device, and the shaft 3 is configured to be rotatable.

 Further, outside the container 2, a storage chamber 24 through which the object to be dispersed passes is provided in a fluid-tight manner so as to abut on the side wall 21. The storage chamber 24 is fitted to the shaft 3, and a seal material 25 for preventing fluid leakage is attached to a connection portion with the shaft 3.

 Further, a gap separator 26 is attached to the inside of the container 2 at the opening 23 of the side wall 21 so as to be inserted into the shaft 3. The gap separator 26 is for separating the object to be dispersed and the medium. Specifically, a gap is provided between the opening 23 and the gap separator 26. The gap is sized such that media can not pass through, but dispersed objects can pass through. The gap separator 26 is an example of the present embodiment, and a screen mechanism, a centrifuge mechanism, or the like may be used as long as the medium and the object to be dispersed can be separated.

  Further, a discharge pipe 27 is connected to the storage chamber 24, from which the dispersed object after dispersion is discharged. Further, a supply pipe 28 is connected to the side wall 22 opposite to the side wall 21, and a dispersion target before dispersion is supplied from this. A pump (not shown) is connected to the supply pipe 28 to supply the object to be dispersed into the container 2.

  In addition, the container 2 is covered by a water cooling jacket 5. The water cooling jacket 5 is provided with an inlet 51 and an outlet 52 for cooling water, and the cooling water is introduced from the inlet 51 and flows out from the outlet 52 to cool the container 2 and the inside thereof.

  The dimensions of the disperser 1 of this embodiment are, for example, the dimension in the longitudinal direction of the container 2 = 370 mm, the inner diameter of the container 2 = 150 mm, the diameter of the shaft 3 = 36 mm, the outer diameter of the dispersion disk 4 = 126 mm, The distance between the dispersion disks 4 is 43 mm.

<2. Structure of distribution disk>
Next, the distribution disk 4 will be described. As shown in FIG. 1, seven dispersing disks 4 are fixed to the shaft 3 at regular intervals in the container 2. The number of dispersion disks 4 is an example of the present embodiment, and may be at least seven.

  As shown in FIG. 2A, the dispersion disc 4 includes ten substantially trapezoidal projecting pieces 41 extending outward in the radial direction at the outer peripheral portion. The number of projecting pieces is an example of the present embodiment, and may be a number in the range of 1/15 or more and less than 1/5 of the disk outer diameter [mm]. The outer diameter of the dispersion disc 4 of the present embodiment is 126 mm as an example, the number of the projecting pieces 41 is 10, and is included in the above range.

  The projecting piece 41 has a first side 41a obliquely extending radially outward in a downstream direction in the disk rotation direction α, a second side 41b extending in a downstream direction and a circumferential direction from the first side 41a, and a second side 41b And a third side 41c extending in the direction of the center of the disc. In addition, the first side 41 a and the second side 41 b have gentle curves, and these are smoothly continuous. Further, in the adjacent projecting pieces 41, the third side 41c of one projecting piece 41 and the first side 41a of the other projecting piece 41 are smoothly continued.

  Further, through holes 42 are respectively provided in the dispersion disc 4 at positions slightly shifted from the respective projecting pieces 41 in the center direction of the disc. In the present embodiment, ten through holes 42 are provided as an example. The through hole 42 is a hole through which media or an object to be dispersed passes. Further, the through hole 42 is a straight hole which penetrates straight from the upper surface 4a to the lower surface 4b of the dispersing disk 4 in the disk width direction. Further, a through hole 43 for attaching to the shaft 3 is provided at the center of the dispersion disc 4.

  The number of through holes 42 is an example of the present embodiment, and it is desirable that the number X of through holes is equal to or less than the number Y of protruding sides (X ≦ Y). If the number of through holes is large, the shear performance will be improved, but if it is too large, the area of the through holes will be small and it will prevent the passage of media. The number of the through holes 42 in the present embodiment is ten, and the number of the projecting sides 41 is ten.

  When the object to be dispersed has a low viscosity or a low concentration, it may be preferable not to provide the through holes 42 (see FIG. 3A). This is because the presence of the through holes 42 may cause a short pass of the dispersed object.

  Further, the dimensions of the dispersion disc 4 of this embodiment are, for example, the disc outer diameter (D1) = 126 mm, the diameter of a circle connecting the centers of the through holes 42 (D2) = 94 mm, and the first side of the projecting side 41 The radius of curvature (R1) of 41a = 59.5 mm, the distance between the center of curvature of the first side 41a and the center of the disc (W1) = 30 mm, the diameter of the through hole 42 = 14 mm, and the disc thickness = 6.0 mm (FIG. 2B) reference).

The dimensions of the dispersion disc 4 are an example of the present embodiment, and it is desirable that the relationship of the above-mentioned disc outer diameter and the like be within the range of the following formula. By setting it in this range, it is possible to obtain a disc with improved shear performance as compared to the conventional one. The shear performance specifically means that the number of collision shears per unit time is large. If the number of impact shears per unit time is large, dispersion is promoted and dispersion performance is improved.
0.65 ≦ D2 / D1 ≦ 0.80 (Equation 2)
0.40 ≦ R1 / D1 ≦ 0.55 (Equation 3)
0.15 ≦ W1 / D1 ≦ 0.30 (Expression 4)

<3. Modified Example of Dispersion Disc>
Next, a modification of the dispersion disk 4 will be described. The main difference between the dispersion disc 60 and the dispersion disc 4 is the shape of the through hole 62. FIG. 3B is a top view of the dispersion disk 60 according to a modification. In FIG. 3B, a plurality of ellipses represented by solid lines on the inner side of the disc indicate openings on the upper surface side of the through hole 62, and a plurality of ellipses represented by dotted lines indicate the opening on the lower surface side of the through hole 62.

  The through holes 42 of the dispersion disc 4 are straight holes that pass through in the width direction in a substantially perfect circular cross section, whereas the through holes 62 of the dispersion disc 60 are elliptical cross sections. From the upper surface to the lower surface, and obliquely penetrates in the same direction as the disk rotation direction α.

  As described above, since the through holes 62 obliquely penetrate in the same direction as the disc rotation direction α, the outer periphery of the container 2 and the dispersion disc 60 is temporarily used when the dispersion disc 60 is attached to the dispersion machine 1 and used. The time during which the object to be dispersed is dispersed by returning the object to be dispersed or the medium which has flowed downstream from the gap of the part from the surface on the downstream side of the through hole 62 to the surface on the upstream side. The distance is increased, and the circulation of the media in the container 2 promotes the dispersion. The dispersion disc 60 is suitable particularly when the object to be dispersed has a high viscosity.

  Further, the dispersion discs 70, 80, and 90 shown in FIG. 3C have changed the dimensions such as the disc outer diameter of the dispersion disc 4, the number and shape of the projecting sides 41, the size, and the number and size of the through holes 42. It is a modification. Each of the dispersion disks 70, 80, and 90 is a disk satisfying the expressions 1 to 4 described above, and thus is a disk with improved dispersion performance as compared to the prior art.

<4. Effect test>
Subsequently, an effect test of the dispersion disk of the present embodiment and the conventional dispersion disk will be described. First, the circumstances of the inventors of the present invention leading to the present invention will be described. The inventors of the present application conducted a conventional abrasion test of the dispersion disc, and as shown in the photograph of FIG. 12, the position of A of the dispersion disc showed almost no abrasion, and severe abrasion was observed at the position of B. It was seen. That is, it was found that the position of A of the dispersion disk did not contribute to the dispersion, but the position of B greatly contributed.

  Then, based on this result, the inventors repeatedly conducted intensive studies to improve dispersion performance, that A does not contribute to dispersion but B contributes, and the acute angle part of A conceals C following B. The dispersion disc of the present invention has been obtained by considering and considering various factors and other factors. The structure and the like of one embodiment of the dispersion disk of the present invention are as described above.

  Next, in order to confirm the effect of the dispersion disk of the present embodiment, a comparison test with a conventional dispersion disk was performed. The conventional dispersion disc used in this test differs in shape from the dispersion disc used in the wear test. FIG. 4 shows the dispersion disk 4 of the present embodiment and two conventional dispersion disks 100 and 200. The conventional dispersion disk 100 (high dispersion type) has higher dispersion performance than the other dispersion disk 200 (notch type).

  Then, each of these dispersion disks was attached to a dispersion machine, and was operated under predetermined conditions, and these effects were verified. In order to make the conditions constant, the same disperser is used, and the cross-sectional area of the gap between the container of the disperser and the outer peripheral part of the dispersing disc, ie, the cross section where the object to be dispersed passes The areas were approximately the same. The hatched portion shown in FIG. 5 is a cross section in which the object to be dispersed passes through the outer peripheral portion of the disc, and the cross sectional area is shown in FIG.

  In addition, for the test, a disperser equivalent to the above-described disperser 1 was used. That is, the dimensions of the container in the longitudinal direction = 370 mm, the inner diameter of the container = 150 mm, the diameter of the shaft = 36 mm, and the distance between the dispersion disks = 43 mm. In addition, the outer diameter of each of the dispersion disks is approximately 126 mm. Then, 80% of φ2 mm zirconia beads were filled in the container of the dispersing machine. Moreover, the high viscosity red rust paint was used for the dispersion | distribution object. In the following tests, the dimensions and other conditions of the above-mentioned disperser are common.

(Test 1)
First, under the above conditions, each dispersion disk 4, 100, 200 is attached at a disk peripheral velocity of 10 m / sec, a flow rate of 340 cc / min (specific gravity 2.35 g / cc) and a dispersion target of 14 kg. It calculated about the number of collision shears per second at the time of each operation. The results are shown in FIG. The dispersion disk 4 of this embodiment is 253, the conventional high dispersion type dispersion disk 100 is 202, and the conventional cutout type dispersion disk 200 is 101. From this result, it can be seen that the number of shears of the dispersion disk 4 of this embodiment is improved by about 25% to 150% compared to the conventional dispersion disks 100 and 200, and the dispersion performance is significantly improved. is expected.

(Test 2)
Next, using the dispersion disc 4 of the present embodiment and the conventional high dispersion type dispersion disc 100, a comparative test was conducted on the relationship between the input power and the particle diameter. The test results on the relationship between the input power and the particle diameter are shown in FIG.

  As shown in FIG. 8, for example, comparing the input power when the particle diameter of the dispersion object reaches 15 μm, it is 0.46 kwh / L in the case of the conventional dispersion disc 100, while the dispersion for this embodiment is used. The disk 4 was 0.33 kwh / L, and it was found that the same dispersion performance was obtained at a low input power of about 70%. From this result, it can be confirmed that the dispersing disk 4 of the present embodiment can obtain the same dispersing effect with less input power than the conventional dispersing disk 100, and it is proved to be energy saving.

(Test 3)
Next, the test result about the relationship between the dispersion time and the particle diameter in the test of Test 2 and the same conditions is shown in FIG. As shown in FIG. 9, for example, when the dispersion time when the particle diameter of the dispersion object reaches 15 μm is compared, it is 52 minutes in the case of the conventional dispersion disc 100, while the dispersion disc 4 of this embodiment is It was 34 minutes, and it was found that the dispersion time was reduced by about 35%. From these results, it was proved that the dispersion disk 4 of the present embodiment significantly improves the dispersion performance as compared with the conventional dispersion disk 100.

(Test 4)
Next, the test results on the relationship between the pump pressure and the flow rate for supplying the dispersion target in the test under the same conditions as Test 2 are shown in FIG. As shown in FIG. 10, in the case of the conventional disc for dispersion 100, the disc for dispersion 4 of the present embodiment is gentle while the flow rate is substantially saturated at about 1100 cc / min around the pressure limit of 0.4 MPa. Following the rise, it was found that even when the flow rate is 1300 cc / min or more, liquid delivery is possible.

  The cause of this pressure rise is assumed to be due to the media being unevenly distributed in the vicinity of the gap separator, and the dispersion disc 4 of the present embodiment is less likely to cause uneven distribution of media compared to the conventional dispersion disc 100. I understand. Although the uneven distribution of the media greatly affects the dispersion performance such as hindering the uniform dispersion of the object to be dispersed, the result also shows that the dispersion disk 4 of the present embodiment is more than the conventional dispersion disk 100. It has been proved that the dispersion performance is improved.

  From the above results, according to the dispersion disk 4 of the present embodiment, it is possible to achieve significant improvement in dispersion performance and energy saving as compared with the prior art.

<3. Other Embodiments>
As described above, although the preferred embodiments of the present invention have been described with reference to the drawings, various additions, modifications, or deletions can be made without departing from the spirit of the present invention. For example, in the above-described embodiment, the horizontal dispersing machine is described, but the invention can also be applied to a vertical dispersing machine arranged along the vertical direction. The other detailed structures and dimensions are an example of the present embodiment, and other dimensions and the like may be used. Therefore, such is also included in the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Dispersing machine 2 container 21 side wall 22 side wall 23 opening 24 storage room 25 seal material 26 gap separator 27 discharge pipe 28 supply pipe 3 shaft 4 dispersing disc 4 a upper surface 4 b lower surface 41 projecting piece 41 a first side 41 b second side 41 c third Side 42 through hole 43 through hole 5 water cooling jacket 51 inlet 52 outlet 60 dispersion disc (modification)
62 Through hole 70 Disc for dispersion (modification)
80 Distributed disk (Modified example)
90 Distributed disk (modification)

Claims (12)

A disk used for a media type dispersing machine,
A plurality of projecting pieces extending radially outward on the outer periphery of the disc;
The shape of the protrusion is substantially trapezoidal,
The number of the projecting pieces is in the range of 1/15 or more and less than 1/5 of the disk outer diameter [mm]
disk. The projecting piece has a first side obliquely extending in the downstream direction and the radially outer direction in the disc rotation direction;
A second side extending in the downstream direction and the circumferential direction from the first side;
And a third side extending from the second side toward the center of the disc.
The disk according to claim 1. The first side and the second side are smoothly continuous,
The disk according to claim 2. The first side and the second side are curved,
The disk according to claim 3. The third side of the adjacent first protrusion and the first side of the second protrusion are smoothly continuous,
The disk according to any one of claims 2 to 4. It further comprises a plurality of through holes through which the media passes,
The through hole is a through hole penetrating in the width direction of the disc.
The disk according to any one of claims 1 to 5. The through hole obliquely penetrates in the same direction as the disk rotation direction from the upper surface to the lower surface of the disk.
A disk according to claim 6. The through holes pass straight in the width direction from the upper surface to the lower surface of the disc.
A disk according to claim 6. The through hole is disposed at a position closer to the projection than the center of the disc.
A disk according to any one of claims 6 to 8. The number X of the through holes and the number Y of the protruding sides satisfy the following equation 1:
A disk according to any one of the preceding claims.
X ≦ Y (Equation 1) The distance D2 between the centers of the through holes facing the center of the disc, the outer diameter D1 of the disc, the radius of curvature R1 of the first side of the protruding side, and the center of curvature of the first side And the distance W1 between the center of the disc and the disc satisfy the following formulas 2 to 4,
A disc according to claim 10.
0.65 ≦ D2 / D1 ≦ 0.80 (Equation 2)
0.40 ≦ R1 / D1 ≦ 0.55 (Equation 3)
0.15 ≦ W1 / D1 ≦ 0.30 (Expression 4) A disc according to any one of the preceding claims.
A rotatable shaft having a plurality of said disks mounted at intervals;
A container covering the disc and the shaft;
And media filled in the container.
Dispersing machine.