Dispersion unit for a wireless type dispersion device

Abstract

To provide a dispersion unit for a media-less type dispersion device and media-less type dispersion device that can efficiently shear and disperse a dispersion target drawn into a stator without using media.SOLUTION: A dispersion unit includes: a stator 50 which has a cylindrical body 51 that has ring-shaped top plate and bottom plate and is suspended and held in a bottomed cylindrical tank in which a dispersion target is stored; and a disc-shaped dispersion rotor 1 which is fixed to a rotating shaft that passes through the top plate and the bottom plate, rotates within the stator and delivers the dispersion target drawn into the stator toward the cylindrical body 51 of the stator 50. The dispersion rotor 1 has multiple grooves 5 that are radially formed toward the outer periphery from the rotating shaft side on each surface opposed to the top plate and the bottom plate. The stator 50 has multiple slits 54 whose widths become narrower as heading toward the outer side from the inner side of the cylindrical body 51.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a dispersion unit for a batch media-less type dispersion device for storing, dispersing, and shearing an object to be dispersed in a tank of a dispersion device in the process of manufacturing objects to be dispersed such as paints, inks, resist inks, sealing materials (adhesives used for LEDs, semiconductors, etc.), solder pastes, active material pastes for lithium-ion batteries, pharmaceuticals, and cosmetics. To Related.

Background Art

[0002] Turbine-stator type stirring devices for manufacturing emulsified products and suspension products such as cosmetics and pharmaceuticals are known. The stirring device is composed of a turbine that rotates at high speed in a container and a stator that surrounds the turbine. The turbine is composed of an annular impeller part having a plurality of groove parts radially, and an inducer part having four blade parts that are connected to the inner wall of the impeller part at the central opening of the impeller part and are located at the lower end of the rotating shaft. The stator is cylindrical, and a plurality of through holes are formed on its outer periphery. With this configuration, the stirring device allows the object to be processed to flow from the lower end opening of the stator into the impeller part by the suction force of the inducer part accompanying the rotation of the turbine, and shears the object to be processed within the clearance between the outer periphery of the impeller part rotating within the stator and the inner wall of the main body part of the stator (see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In recent years, dispersible objects with a wide range of properties have been produced, from low-viscosity objects to high-viscosity ones such as active material pastes for lithium-ion batteries. However, for certain dispersible objects, it is necessary to gradually reduce the particle size of the dispersible object using different apparatuses. For example, a premixing process in which the dispersible object is roughly stirred by a batch-type stirrer, a pre-dispersion process using a batch-type media dispersion apparatus, and a main dispersion process using a continuous media dispersion apparatus that circulates the supply and discharge of the dispersible object are carried out. In such cases, the following inconveniences occur. When using different types of batch-type and continuous media dispersion apparatuses, it is necessary to transfer the dispersible object to the tank or container of each apparatus for each process. In addition, the tanks and the like used in each process need to be cleaned after use. When cleaning, it is necessary to carefully clean so that no media remains. Therefore, it is desired to reduce the processes using media dispersion apparatuses.

[0005] However, since media-less dispersion apparatuses have lower shearing ability and dispersion ability compared to media dispersion apparatuses, there is a problem that they cannot be used for the treatment of all types of dispersible objects. That is, the stirring apparatus of Citation 1 can only shear the object flowing into the impeller part by the suction force of the inducer part during rotation only at the clearance part between the outer periphery of the impeller part and the inner wall of the stator, so there is an inconvenience that the dispersible object cannot be miniaturized to a predetermined particle size.

[0006] The present invention has been made to solve such problems, and provides a dispersion unit for a media-less dispersion apparatus that enables miniaturization of a dispersible object to a predetermined particle size without using media. To The object is to provide.

Means for Solving the Problems

[0007] The present invention provides a dispersion unit for a media-less dispersion apparatus as follows. To To provide.

[0008] A dispersion unit for a media-less type dispersion device, comprising: a stator composed of a cylindrical main body having a ring-shaped top plate and a bottom plate that are suspended and held in a bottomed cylindrical tank in which a dispersion object is stored; and a disk-shaped dispersion rotor that is fixed to a rotating shaft passing through the top plate and the bottom plate, rotates within the stator, and sends out the dispersion object drawn into the stator toward the cylindrical main body of the stator. The dispersion rotor has a plurality of grooves formed radially from the rotation axis side toward the outer periphery on each surface facing the top plate and the bottom plate. The stator is formed with a plurality of slits or through holes that become narrower from the inside to the outside of the cylindrical main body, and discharges the dispersion object sent out from the outlets of the plurality of grooves through the slits or the through holes. A dispersion unit for a media-less type dispersion device, characterized by the above.

[0009] In the above-described dispersion rotor of the present invention, the plurality of grooves formed radially are not limited to a plurality of linearly extending grooves that extend straight in the radial direction from the center of the dispersion rotor in a plan view, and may be curved. The curved shape may be, for example, a shape having one bend like a bow shape described later, or a shape having a plurality of bends. However, grooves whose planar shape is refracted or bent, or grooves whose cross-section is deformed along the flow direction, to such an extent that they impede or decelerate the flow of the object to be dispersed from the inlet to the outlet of the groove do not fall within the scope of the radially formed grooves herein. Refraction is a bent portion. For example, when the groove has a "く" shape in a plan view and the flow of the object to be dispersed is impeded or decelerated at the refracted portion, the "く" shaped groove does not fall within the scope of the radially formed grooves. A bend is a portion that curves without being bent. A bend is less likely to impede or decelerate the flow of the object to be dispersed than refraction, but depending on the degree of the bend, it may impede or decelerate the flow of the object to be dispersed. Grooves having such a bent portion do not fall within the scope of the radially formed grooves. Deformation is, for example, a change in the cross-section due to a convex portion formed in the middle of the groove. The radially formed groove may be, for example, a shape in which the object to be dispersed enters from the inlet of the groove during the rotation of the dispersion rotor and is sent out from the outlet at the outer edge of the dispersion rotor without colliding with a collision portion or the like and decelerating during the process of flowing from upstream to downstream. Therefore, it does not have a structure that impedes or decelerates the flow of the object to be dispersed from the time it enters the groove at the inlet until it is sent out from the outlet.

[0010] Further, it is preferable that the outlet of the dispersion rotor of the present invention is backward so as to suppress the intrusion of the object to be dispersed from the outlet, which causes deceleration separately from the deceleration caused by the collision of the object to be dispersed. That is, as shown in FIG. 1, focusing on one groove 5 of the dispersion rotor 1 that rotates in the direction indicated by the arrow R, since the groove 5 extends straight along the radius, the outlet faces directly sideways. Therefore, since the intrusion of the object to be dispersed from the outlet during the rotation of the dispersion rotor 1 is suppressed, the object to be dispersed flowing through the groove 5 is not decelerated. Therefore, the following settings are made so that the object to be dispersed does not intrude from the outlet based on this groove 5.

[0011] First, divide the dispersion rotor 1 into upper and lower halves with reference to the groove 5, and define the upper side as the front and the lower side as the rear. Then, fix the position of the inlet of the groove 5. If the outlet is located on the arc of the lower half of the dispersion rotor 1, the outlet will face backward. For example, the grooves 5a to 5d are set with their respective outlets in the direction of the arrow L along the arc. Each outlet always faces backward, and the intrusion of the object to be dispersed from the outlet during the rotation of the dispersion rotor 1 is suppressed. Therefore, the grooves 5a to 5d connecting the fixed inlet and each outlet are not limited to only straight lines, but include an arcuate shape (groove 5d) that curves forward and inward. From the above, the plurality of radial grooves of the present invention are not limited to a form that extends straight from the rotation axis side to the outer periphery, but include an arcuate shape and the like.

[0012] According to this configuration, the dispersion rotor housed in the stator is immersed in the object to be dispersed stored in the tank. The dispersion rotor draws the object to be dispersed into the stator through the gaps between the rotation axis at the openings of the top plate and the bottom plate of the stator while rotating. The dispersion rotor forms two flows of the object to be dispersed on each surface facing the top plate and the bottom plate of the stator as it rotates. The first flow rotates between the top plate and the bottom plate of the stator with the dispersion rotor in between, and moves from the rotation axis side (hereinafter, appropriately referred to as "upstream") to the outer periphery side (hereinafter, appropriately referred to as "downstream"). The second flow moves downstream along each groove formed on both surfaces of the dispersion rotor.

[0013] The object to be dispersed in the first flow is sheared by the frictional resistance generated as the dispersion rotor rotates on each surface of the dispersion rotor facing the inner walls of the top plate and the bottom plate of the stator. That is, the dispersion rotor can efficiently shear the object to be dispersed flowing through the narrow gap.

[0014] The object to be dispersed in the second flow is subjected to the centrifugal force accompanying the rotation of the dispersion rotor as it flows through the groove. Therefore, the object to be dispersed is pumped downstream along the groove by the centrifugal force and vigorously sent out from the outlet. At this time, a part of the object to be dispersed vigorously collides with the inner wall of the stator and is dispersed by the impact. Also, the object to be dispersed is sheared by the outer peripheral edge of the rotating dispersion rotor. Further, a part of the accelerated object to be dispersed directly flows into the through holes or slits of the stator.

[0015] Since the plurality of slits or through holes of the stator become narrower from the inside to the outside of the cylindrical body, the object to be dispersed vigorously fed from the groove of the dispersion rotor is further pressurized and vigorously discharged outside the stator as it passes through the slit or through hole. Therefore, the retention of the object to be dispersed in the stator is suppressed.

[0016] As described above, for the object to be dispersed drawn into the stator, by the synergistic effect of three actions: shearing using frictional resistance on the front and back surfaces of the dispersion rotor, pumping from the upstream to the downstream of the groove to cause the object to be dispersed to collide with the inner wall of the stator, and shearing by the outer peripheral edge of the dispersion rotor, the object to be dispersed can be dispersed to a predetermined particle size without using a medium. Also, unlike a conventional production line, it is not necessary to perform stepwise pre-dispersion treatment and main dispersion treatment using different media-type dispersion devices after premixing treatment. In other words, the premixing treatment and pre-dispersion treatment can be replaced with a media-less type dispersion device, and then the main dispersion treatment can be performed. Therefore, only the media-type dispersion device for the main dispersion treatment requires careful cleaning treatment to manage the media and ensure that no media remains, and furthermore, the number of devices used can be reduced, which in turn reduces the number of processing steps in the production line and significantly improves work efficiency.

[0017] In the above configuration, it is preferable that each of the plurality of slits or through holes of the stator is formed such that its inner inlet is larger than the outlet of the groove of the dispersion rotor.

[0018] According to this configuration, since the inlet of the through-hole or slit is formed larger than the outlet of the groove, it becomes easier to receive the flow of the object to be dispersed that is vigorously sent out from the groove without decelerating the flow. Therefore, the stator can vigorously discharge the object to be dispersed into the tank outside the stator.

[0019] In the above configuration, the plurality of slits or through-holes of the stator include a receiving portion that receives the object to be dispersed sent out from the groove of the dispersion rotor in the same direction, and a collision portion that causes the object to be dispersed received by the receiving portion to collide before being discharged outside the stator, which is preferable.

[0020] According to this configuration, the receiving portion receives the flow of the object to be dispersed in the same direction as the feeding direction from the groove, thus suppressing the deceleration of the flow of the object to be dispersed. The collision portion causes the object to be dispersed received by the receiving portion to collide before being discharged outside the stator. That is, the object to be dispersed that has flowed vigorously into the receiving portion collides with the collision portion before being discharged outside the stator, and is further dispersed. Therefore, the dispersion unit can further improve the efficiency of the dispersion process.

[0021] In addition, in this configuration, the receiving portion and the collision portion form a communicating flow path, the receiving portion receives the object to be dispersed sent rearward from the groove and flows it rearward, and the collision portion preferably reverses the flow of the object to be dispersed received by the receiving portion forward.

[0022] According to this configuration, the receiving part of the stator receives and guides rearward the object to be dispersed that is sent rearward from the groove of the dispersion rotor, thereby suppressing the deceleration of the flow of the object to be dispersed that is vigorously sent out from the groove of the dispersion rotor. The collision part reverses the flow of the object to be dispersed flowing from the receiving part forward. That is, since the communication part between the receiving part and the collision part is, for example, bent or refracted, the object to be dispersed collides with the inner wall on the collision part side of the communication part and is discharged outside the stator. Due to the collision with the inner wall during this reversal, the object to be dispersed is further promoted to be dispersed.

[0023] Furthermore, as the object to be dispersed is drawn into the stator while swirling with the rotation of the dispersion rotor, the object to be dispersed stored in the tank not only circulates up and down in the tank but also rotates in the rotation direction of the dispersion rotor. The object to be dispersed discharged forward from the stator promotes the rotation of the object to be dispersed in the tank. Therefore, the dispersion unit can smoothly circulate the object to be dispersed in the tank without causing it to stay.

[0024] Also, in the above configuration, the dispersion rotor has fan-shaped convex parts between adjacent grooves, and when the convex parts are viewed in plan from the axial center side of the rotation axis of the dispersion rotor, the convex parts have a surface area larger than the opening area of the grooves. It is preferable that the top plate and the bottom plate of the stator have inner walls facing the surface of the convex part.

[0025] According to this configuration, the dispersion unit sets the gaps between the surface of the convex part and the inner wall of the top plate and between the surface of the convex part and the inner wall of the bottom plate to be uniform and narrow. That is, each inner wall can be disposed in close proximity to the convex part. Therefore, frictional resistance can be efficiently generated for the object to be dispersed flowing in the narrow gap between each inner wall surface of the top plate and the bottom plate, and thus the object to be dispersed can be efficiently sheared.

[0026] In addition, in the above configuration, when the dispersion rotor is viewed from the front in a direction perpendicular to the rotation axis, the dispersion rotor has a tapered shape that tapers from the rotation axis side toward the outer periphery. It is preferable that each inner wall of the top plate and the bottom plate is formed in a tapered shape facing each tapered surface of the dispersion rotor.

[0027] According to this configuration, the dispersion rotor efficiently accelerates the object to be dispersed drawn into the stator along with its rotation while flowing it downstream along each tapered surface. Also, since each surface of the dispersion rotor is such that the inner walls of the top plate and the bottom plate of the stator are parallel, it is possible to suppress the pressure loss of the object to be dispersed flowing between the opposing surfaces. Furthermore, the dispersion rotor efficiently generates frictional resistance against the object to be dispersed in the first flow flowing between the inner wall surfaces of the top plate and the bottom plate by means of the fan-shaped convex portions having an area larger than the opening area of the groove width, and thus can efficiently shear the object to be dispersed.

[0028] Also, in the above configuration, the dispersion rotor has a ring-shaped groove formed around the rotation axis for receiving the object to be dispersed drawn along the rotation axis as it rotates. The outer edge of the ring-shaped groove communicates with the plurality of grooves. In each opening of the top plate and the bottom plate of the stator, it is preferable to provide a pair of impellers having a plurality of spiral blades on the outer periphery of each of the ring-shaped mounting portions attached to the rotation axis with the dispersion rotor interposed therebetween.

[0029] According to this configuration, a pair of impellers attached to the rotation axis with the dispersion rotor interposed therebetween rotate at each opening of the top plate and the bottom plate, thereby promoting the drawing-in of the object to be dispersed into the stator. As the drawing-in of the object to be dispersed into the stator is promoted, the internal pressure of the stator increases, further increasing the flow velocity of the object to be dispersed. Therefore, the impact force of the object to be dispersed sent out from the groove against the inner wall of the cylindrical body increases, and the dispersion efficiency of the object to be dispersed is improved.

[0030] In addition, in the above configuration, it is preferable that each of the spiral blades has a length such that when viewed in plan from the axial direction of the rotation axis, the front portion of the rear spiral blade is covered by the rear portion of the front spiral blade adjacent in the front and rear.

[0031] According to this configuration, as the internal pressure of the stator increases, the object to be dispersed tries to return from the openings of the top plate and the bottom plate to the outside of the stator. However, at the openings, a plurality of adjacent spiral blades are set so that the front and rear in the rotation direction overlap. That is, when viewed in plan from the axial direction of the rotation axis, the spiral blades cover the front and rear intervals of the adjacent spiral blades, so the impeller suppresses the object to be dispersed from returning from the opening to the outside of the stator. Therefore, the dispersion unit can maintain the pressure in the stator substantially constant, and can promote the dispersion and shearing efficiency in the stator and the dispersion efficiency in the process of passing through the slit or through-hole of the stator.

Advantages of the Invention

[0032] The present invention provides a dispersion unit for a media-less type dispersion device capable of efficiently shearing and dispersing an object to be dispersed drawn into a stator without using a media. To Provide.

Brief Description of the Drawings

[0033]

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Mode for Carrying Out the Invention

[0034] <First Embodiment> Hereinafter, an embodiment of a dispersing unit for a media-less type dispersing device according to the present invention will be described in detail with reference to the drawings. In this embodiment, the dispersing unit will be described based on the form provided in the media-less type dispersing device.

[0035] As shown in FIG. 2, the dispersing device 10 includes a tank 20 for storing an object to be dispersed, a rotating shaft 30 to which a dispersing rotor 1 is attached, a power source 40 for rotating the rotating shaft 30, and a stator 50. Among these components, the dispersing rotor 1 and the stator 50 constitute the dispersing unit of the present invention. In the dispersing rotor 1 of each of the following embodiments, the surface facing the top plate of the stator 50 is appropriately referred to as the "front surface", and the surface facing the bottom plate is appropriately referred to as the "back surface". Further, as will be described later, the dispersing rotor 1 sends out the object to be dispersed from the rotating shaft side to the outer peripheral side as it rotates. Hereinafter, the rotating shaft side will be appropriately referred to as the "upstream" or "inner side", and the outer peripheral side will be appropriately referred to as the "downstream" or "outer side".

[0036] As shown in FIGS. 3 to 5, the dispersion rotor 1 is disk-shaped when viewed in plan from the center side of the through hole 2 through which the rotating shaft formed in the center thereof is inserted, and is tapered so as to taper toward the outer periphery when viewed from the front. A ring-shaped groove 4 is formed around the mounting portion 3 with the mounting portion 3 to the rotating shaft interposed therebetween. Further, the dispersion rotor 1 has a plurality of grooves 5 formed radially from the rotating shaft side toward the outer periphery on both the front and back surfaces. Note that, as shown in FIG. 5, the dispersion rotor 1 rotates in the rotation direction R indicated by the arrow about the axis P.

[0037] As shown in FIGS. 5 and 7, the ring-shaped groove 4 is formed by the inner wall portion 4A and the convex portion 6 outside thereof. The inner wall portion 4A forms a tapered inclined surface that tapers toward the bottom surface. The outside communicates with the plurality of grooves 5. In this embodiment, the outer diameter of the ring-shaped groove 4 is set to be substantially the same as the diameter of the openings of the top plate and the bottom plate of the stator 50.

[0038] The grooves 5 extend straight from the rotating shaft side toward the outer periphery, and the same number of grooves 5 are formed at equal intervals on both the front and back surfaces of the dispersion rotor 1. Further, the grooves 5 are formed at different positions on the front and back surfaces of the dispersion rotor 1. That is, the grooves 5 are formed at positions on the back surface side of the intermediate positions between the adjacent grooves 5 on the front surface of the dispersion rotor 1. In other words, the grooves 5 on the front and back surfaces are formed alternately in the rotation direction. Note that each groove 5 has a smaller cross section as it goes from the upstream to the downstream. That is, as shown in the partially enlarged view of FIG. 5, the groove 5 of this embodiment is set such that the upstream inlet width L1 > the downstream outlet width L2. Further, the depth of the groove 5 is set to be constant. Therefore, the bottom surface of the groove 5 is inclined at the same angle as the surface of the convex portion 6 described later.

[0039] Note that the taper angle of the dispersion rotor 1 is set according to the relative positional relationship with the inner wall of the cylindrical main body of the stator, the slit or the through hole formed in the stator when the dispersion rotor 1 is incorporated into the dispersion device described later. In this embodiment, it is set as follows.

[0040] In this embodiment, although the grooves 5 on the front and back surfaces of the dispersion rotor 1 do not overlap at the same position and the object to be dispersed is not simultaneously fed into the slit 54 of the stator 50, for the sake of convenience of explanation, in FIG. 6, it will be assumed that the grooves 5 on the front and back surfaces are at the same position for explanation.

[0041] The outlets of both grooves 5 formed on the front and back surfaces of the dispersion rotor 1 face the inlet of the stator 50. Also, the position X where two virtual lines (dashed lines in FIG. 6) extending outward from the central axes in the longitudinal directions of both grooves 5 formed on the front and back surfaces of the dispersion rotor 1 intersect is set to be deeper than the inlet of the slit 54 formed in the cylindrical main body 51 of the stator 50. With this setting, the objects to be dispersed sent out from each groove 5 formed on both surfaces of the dispersion rotor 1 do not collide with each other until they reach the inner wall of the stator 50. That is, the dispersion rotor 1 does not cause the two flows of the objects to be dispersed sent out from the front and back surfaces to collide with each other and stall by its rotation. Therefore, with respect to the inner wall of the stator 50, the objects to be dispersed collide while maintaining their momentum, and are dispersed by this collision. Also, with respect to the slit 54 formed in the cylindrical main body 51 of the stator 50, the objects to be dispersed are forcefully fed in and discharged into the tank outside the stator.

[0042] Substantially fan-shaped convex portions 6 are formed between adjacent grooves 5 on the front and back surfaces of the dispersion rotor 1. In this embodiment, the convex portion 6 is set such that when the dispersion rotor 1 is viewed in plan from the axial center side of the rotation axis, the surface area of the convex portion 6 has an area larger than the opening area of the groove 5.

[0043] As shown in FIG. 2, the tank 20 is a bottomed cylindrical shape and is provided with a jacket 21 on its outer periphery. The jacket 21 adjusts the internal temperature of the tank 20 by supplying and circulating a refrigerant or warm water or the like through the flow path formed inside. Also, the tank 20 is provided with a detachable upper lid 22 at the upper part. The upper lid 22 seals the inside of the tank. Further, the tank 20 is provided with a discharge portion 23 at the lower part for discharging the stored object to be dispersed.

[0044] The rotating shaft 30 is inserted into the tank through a through hole formed in the center of the upper lid 22 via a seal such as a gland packing or a mechanical seal. The dispersion rotor 1 is attached to the tip side of the rotating shaft 30.

[0045] The power source 40 is, for example, a motor. A belt is suspended between the drive shaft of the motor and the rotating shaft 30, and the driving force is transmitted to the rotating shaft 30. Note that the motor of the power source 40 may be directly connected to the rotating shaft 30.

[0046] The stator 50 is suspended and held in the tank by a plurality of stator rods 60 inserted into the tank through through holes formed in the upper lid 22. That is, the stator 50 is composed of a cylindrical main body 51, a top plate 52 and a bottom plate 53 in which a through hole (opening) for inserting the rotating shaft 30 is formed, and houses the dispersion rotor 1 attached to the rotating shaft 30 (see FIGS. 2 and 6).

[0047] The cylindrical main body 51 has a plurality of holes 55 (see FIG. 4) for inserting and connecting the stator rods 60 on the upper end surface, and a plurality of slits 54 are formed at equal intervals around its outer wall. The slit 54 is set to become narrower from the inside to the outside. That is, in the present embodiment, the width of the slit 54 is such that the inner inlet width L3 > the outer outlet width L4. Also, the relationship between the outlet width L2 of the groove 5 and the inlet width L3 of the slit 54 is set such that the outlet width L2 of the groove 5 ≤ the inlet width L3 of the slit 54. That is, the inlet of the slit 54 is set to easily receive the dispersion target object sent out by accelerating from the outlet of the groove 5 without decelerating it. Also, the inlet depth of the slit 54 is deeper than the outlet of the groove 5.

[0048] Also, the slit 54 covers the top plate 52, so that the upper part is closed to form a through hole. In the present embodiment, the formation in the cylindrical main body 51 is not limited to the slit 54, and a through hole formed through the wall may be used.

[0049] The top plate 52 and the bottom plate 53 have an increasing thickness from the rotation axis side toward the inner wall of the cylindrical main body 51, and form inclined surfaces that are parallel to the front and back surfaces of the dispersion rotor 1 and have a predetermined clearance. Further, each opening of the top plate 52 and the bottom plate 53 is set to have substantially the same outer diameter as the ring-shaped groove 4 of the dispersion rotor 1. In this embodiment, the clearance is appropriately set based on the resonance phenomenon obtained from the frequency analysis of the natural vibration frequency of the dispersion rotor 1 and the vibration acceleration during its rotation so as not to contact the respective inner walls during the rotation of the dispersion rotor 1.

[0050] <Operation Explanation> Next, the operation of the dispersion device 10 will be described. First, an unprocessed object to be dispersed is stored in the tank 20 up to a predetermined amount. At this time, the stator 50 and the dispersion rotor 1 are immersed in the object to be dispersed. The motor, which is the power source 40, is operated to start the dispersion process. That is, the rotational force of the motor is transmitted to the rotary shaft 30 via the belt, and the rotary shaft 30 is rotated while generating a predetermined rotational speed and torque. As the rotary shaft 30 rotates, the dispersion rotor 1 draws the object to be dispersed into the stator through the gap between the rotary shaft 30 at each opening of the top plate 52 and the bottom plate 53 of the stator 50 while rotating within the stator. At this time, as the dispersion rotor 1 rotates, two flows are formed in the object to be dispersed on both the front and back surfaces of the dispersion rotor 1.

[0051] The first flow rotates in the rotational direction of the dispersion rotor 1 in each clearance formed between the top plate 52 and the bottom plate 53 across the dispersion rotor 1 within the stator, and flows from the upstream on the rotary shaft side toward the downstream on the outer peripheral side. The second flow flows through the respective grooves 5 formed on both surfaces of the dispersion rotor 1 and heads downstream.

[0052] The object to be dispersed in the first flow is sheared by the frictional resistance generated on the front and back surfaces of the dispersion rotor 1 in the clearance as the dispersion rotor 1 rotates.

[0053] The object to be dispersed in the second flow is pumped downstream by a groove 5 that narrows in width from upstream to downstream. That is, the object to be dispersed flowing through the groove 5 is subject to the centrifugal force associated with the rotation of the dispersion rotor 1. That is, when the centrifugal force is applied to the object to be dispersed flowing through the groove 5, the pressure in the groove increases, and the object to be dispersed is vigorously sent out from the outlet. At this time, a part of the object to be dispersed vigorously collides with the inner wall of the cylindrical main body 51 of the stator 50 and is dispersed by the impact. Also, another part of the object to be dispersed vigorously flows into the slit 54 of the cylindrical main body 51. That is, the dispersion rotor 1 efficiently discharges the object to be dispersed into the tank outside the stator. Further, since the grooves 5 on the front and back surfaces of the dispersion rotor 1 are alternately formed in the rotation direction, the object to be dispersed can be continuously sent toward the inner wall and the slit 54 of the cylindrical main body 51 as compared with the case where the grooves 5 are formed at the same positions on the front and back surfaces. Furthermore, the object to be dispersed rotating in the rotation direction between the dispersion rotor 1 and the cylindrical main body 51 as the dispersion rotor 1 rotates is sheared by the outer peripheral edge of the dispersion rotor 1.

[0054] The object to be dispersed discharged into the tank outside the stator becomes a circulating flow in which the flow rotating in the same rotation direction as the dispersion rotor 1 in the tank due to the influence of the rotation of the dispersion rotor 1 and the flow that is vertically divided by the suction force of the dispersion rotor 1 are combined.

[0055] After performing the process for a predetermined time so that the object to be dispersed has a predetermined particle size, the motor is stopped, and the object to be dispersed is moved while remaining in the tank 20, or discharged from the discharge unit 23 and transferred to another container for removal. Thus, a series of operations and processes by the dispersion device 10 are completed.

[0056] The dispersion rotor 1 provided in the dispersion device 10 having the above configuration can disperse the object to be dispersed to a predetermined particle size without using a medium by the synergistic effect of three actions: shearing using frictional resistance on the front and back surfaces with respect to the object to be dispersed drawn into the stator, dispersion caused by accelerating the object to be dispersed from upstream to downstream by the groove 5 and causing it to collide with the inner wall of the cylindrical main body 51 of the stator 50, and shearing by the outer peripheral edge of the dispersion rotor 1.

[0057] Also, in the conventional production line, after performing premixing treatment of the object to be dispersed by a stirrer, pre-dispersion treatment is performed by a media type dispersion device, and further, main dispersion treatment is performed by another media type dispersion device using media with a smaller diameter than the media used during the pre-dispersion treatment. However, by using the media-less type dispersion device with the above configuration, the premixing treatment by the stirrer and the pre-dispersion treatment by the media type dispersion device can be omitted. Therefore, careful cleaning treatment to manage the media and prevent the media from remaining is only required for the media type dispersion device for the main dispersion treatment. Furthermore, the number of devices to be used can be reduced, which in turn reduces the number of processing steps in the production line and significantly improves the working efficiency.

[0058] <Second Embodiment> The dispersion device of this embodiment has a different configuration of the groove 5 in the dispersion rotor 1 of the first embodiment. Note that the dispersion device 10 of this embodiment may have the same configuration as the first embodiment except for the dispersion rotor 1A, but the shape and structure of the slit 54 formed in the cylindrical main body 51 of the stator 50 constituting the dispersion unit are changed. Therefore, different configurations will be described in detail, and the same configurations as those in the first embodiment will be described only by attaching the same reference numerals.

[0059] As shown in FIGS. 7 and 8, the grooves 5A on the front and back surfaces are formed to send the object to be dispersed entering from the inlet rearward from the outlet. That is, as shown in FIG. 9, a virtual line T extending from the inner wall on the rotation direction side of the groove 5A forms a tangent line passing through the contact point M with the outer edge of the ring-shaped groove 4. Therefore, when the dispersion rotor 1A is viewed in plan, the groove 5A is inclined rearward from the rotation axis side. In other words, the groove 5A is formed to be obliquely rearward from the inlet to the outlet. Also, the same number of grooves 5A are formed at equal intervals on the front and back surfaces of the dispersion rotor 1A in the same manner as in the first embodiment. Further, the grooves 5A are formed at different positions on the front and back surfaces of the dispersion rotor 1A. That is, the groove 5A is formed at the position on the back surface side of the intermediate position between the adjacent grooves 5A on the front surface of the dispersion rotor 1A. In other words, the grooves 5A on the front and back surfaces are formed alternately in the rotation direction.

[0060] Substantially fan-shaped convex portions 6A are formed between the adjacent grooves 5A on the front and back surfaces of the dispersion rotor 1A. Also in this embodiment, when the dispersion rotor 1A is viewed in plan from the axial center side of the rotation axis, the convex portion 6A is set to have a surface area larger than the opening area of the width of the groove 5A. Each of these grooves 5A becomes narrower as it goes downstream from the ring-shaped groove 4 communicating upstream. Also, the depth of the groove 5A is set to be constant. Therefore, the bottom surface of the groove 5 is inclined at the same angle as the surface of the convex portion 6A.

[0061] The taper angle of the dispersion rotor 1A is set by the relative positional relationship with the inner wall of the cylindrical main body 51 of the stator 50 or the slit 54 formed in the cylindrical main body 51 in a state where the dispersion rotor 1A is incorporated into the dispersion device 10.

[0062] That is, the inclination angle of the groove 5A in the present embodiment is set such that the intersection position X of the two virtual lines extending outward from the central axes in the longitudinal directions of both grooves 5A formed on the front and back surfaces of the distributed rotor 1A is on the back side of the entrance of the slit 54 formed in the stator 50, similar to the groove 5 in the first embodiment. Particularly in the present embodiment, it is preferable to set the position X at the connecting portion between the receiving portion 54A and the collision portion 54B of the slit 54 described later. With this configuration, the flow of the object to be distributed fed into the slit can collide forcefully against the wall portion of the collision portion 54B without losing its flow velocity.

[0063] The stator 50 has different shapes and configurations of the slit 54 formed in the cylindrical main body 51. As shown in FIGS. 10 and 11, the slit 54 is refracted like the Japanese hiragana character "く" or the alphabet "L". That is, the slit 54 has a receiving portion 54A that receives the object to be distributed sent backward from the distributed rotor 1A in the same direction from the inside to the outside of the stator 50, and a collision portion 54B that causes the flow of the object to be distributed received by the receiving portion 54A to collide against the inner wall when reversing the flow forward. Further, the width of the slit 54 becomes narrower from upstream to downstream. Note that the slit 54 forms a through-hole with its upper part blocked by covering the top plate 52, but it is not limited to this slit 54 and may be a through-hole penetrating the wall.

[0064] As shown in FIG. 11, the receiving portion 54A faces obliquely backward, similar to the groove 5A of the distributed rotor 1A. Specifically, when the outer exit of the groove 5A and the inner entrance of the receiving portion 54A are facing each other, the central axes G in the longitudinal directions of both the groove 5A and the receiving portion 54A are set to overlap. Also, the entrance of the receiving portion 54A is set wider than the exit of the groove 5A. That is, the receiving portion 54A is set to easily receive the object to be distributed sent from the groove 5A.

[0065] <Operation description> Next, the operation of the dispersion device 10 will be described. When the dispersion process is started, the dispersion rotor 1A draws the object to be dispersed into the stator through the gaps between the top plate 52 and the bottom plate 53 of the stator 50 and the rotating shaft 30 while rotating within the stator. At this time, similar to the first embodiment, the dispersion rotor 1A forms two flows in the object to be dispersed on both the front and back surfaces.

[0066] The first flow rotates in the rotational direction of the dispersion rotor 1A between the top plate 52 and the bottom plate 53 across the dispersion rotor 1A within the stator, and flows from the upstream side of the rotating shaft toward the downstream side of the outer periphery while rotating. The second flow flows through the grooves 5A formed on both surfaces of the dispersion rotor 1A and heads downstream.

[0067] The object to be dispersed in the first flow is sheared by the frictional resistance generated on the front and back surfaces of the dispersion rotor 1 in the clearance as the dispersion rotor 1 rotates.

[0068] The object to be dispersed in the second flow is pressure-fed downstream by the grooves 5A whose width narrows from the upstream to the downstream. That is, a centrifugal force is applied to the object to be dispersed flowing through the grooves 5A. That is, when a centrifugal force is applied to the object to be dispersed flowing through the grooves, the pressure inside the grooves increases, and the object to be dispersed is vigorously sent out rearward from the outlet. At this time, the dispersion rotor 1A collides with the inner wall of the stator 50 vigorously without stalling the accelerated object to be dispersed and disperses it, and vigorously feeds the object to be dispersed into the slit 54 of the stator 50. Note that since the grooves 5A on the front and back surfaces of the dispersion rotor 1A are alternately formed in the rotational direction, the object to be dispersed is continuously sent out toward the inner wall of the cylindrical body 51 and the slit 54.

[0069] Here, the object to be dispersed is fed into the slit 54 when the outlet of the groove 5A passes in front of the inlet of the slit 54. In the process of this passage, since the inlet of the receiving portion 54A of the slit 54 is set wider than the outlet of the groove 5A, the object to be dispersed from the groove 5A can be more reliably received inside without being stalled. The object to be dispersed received by the receiving portion 54A maintains its momentum by the further pressing force from the upstream in the process of passing through the slit 54 whose width gradually narrows.

[0070] In the process of this passage, when the object to be dispersed reaches the collision portion 54B, the flow is reversed while colliding with the inner wall thereof and discharged outside the stator. That is, similar to the description based on FIG. 5 in the above-described first embodiment, the position X where the virtual line T extending from both grooves 5A on the front and back surfaces of the dispersion rotor 1A intersects is set as the refraction site which is the connecting portion of the receiving portion 54A and the collision portion 54B. Therefore, the object to be dispersed maintains its momentum until it collides with the inner wall of the refraction site. Accordingly, the object to be dispersed is further dispersed by the impact caused by the collision at the refraction site.

[0071] Furthermore, the object to be dispersed is sheared by the outer peripheral edge of the dispersion rotor 1A rotating between the dispersion rotor 1A and the cylindrical main body 51.

[0072] The object to be dispersed discharged into the tank outside the stator becomes a circulating flow in which the flow rotating in the same rotation direction as the dispersion rotor 1A in the tank and the flow causing vertical division by the suction force of the dispersion rotor 1A are combined.

[0073] After performing the treatment for a predetermined time until the object to be dispersed reaches a predetermined particle size, the motor is stopped, and the object to be dispersed is moved while remaining in the tank 20, or discharged from the discharge portion 23 and transferred to another container for carrying out. Thus, a series of operations and processes by the dispersion device 10 are completed.

[0074] The dispersion rotor 1A provided in the dispersion device 10 with the above configuration subjects the object to be dispersed drawn into the stator to shearing using frictional resistance on its front and back surfaces, pumping of the object to be dispersed while applying centrifugal force in the groove, forceful delivery from the outlet of the object to be dispersed that is pumped, dispersion caused by colliding the object to be dispersed against the inner wall of the cylindrical main body 51 of the stator 50, and shearing by the outer peripheral edge of the dispersion rotor 1A. By the synergistic effect of these three actions, the object to be dispersed can be dispersed to a predetermined particle size. Further, due to the fourth action of colliding against the inner wall of the refraction site, which is the connecting part between the receiving part 54A and the colliding part 54B, during the process of the object to be dispersed passing through the stator, the object is further dispersed, so the dispersion process is further improved.

[0075] Also, in the conventional manufacturing line, after performing premixing treatment of the object to be dispersed by a stirrer, pre-dispersion treatment is performed by a media-type dispersion device, and further, main dispersion treatment is performed by another media-type dispersion device using media with a smaller diameter than the media used during the pre-dispersion treatment. However, by using the media-less type dispersion device with the above configuration, the premixing treatment by the stirrer and the pre-dispersion treatment by the media-type dispersion device can be omitted. Therefore, careful cleaning treatment to manage the media and ensure that no media remains is only required for the media-type dispersion device for the main dispersion treatment. Furthermore, the number of devices used can be reduced, which ultimately reduces the number of processing steps in the manufacturing line and significantly improves work efficiency.

[0076] As described above, the preferred embodiments of the present invention have been explained. However, the present invention is not limited to the above embodiments, and various design changes are possible as long as they are within the scope described in the claims.

[0077] (1) In each of the above embodiments, although the grooves 5 and 5A are set to have a constant depth, they may be set to become shallower toward the downstream. For example, as shown in FIG. 12, the dispersion rotor 1B sets the bottom surface of the groove 5B on the same plane (horizontal plane) as the bottom surface of the ring-shaped groove 4, so that the depth of the groove 5B becomes shallower from the upstream to the downstream. Alternatively, the depth of the groove 5B may be appropriately adjusted by setting the inclination angle of the groove 5B to be gentler than the inclination angle of the convex portion 6. According to this configuration, the pressure of the object to be dispersed flowing through the groove 5B can be further increased.

[0078] When the groove 5B is set horizontally as in the dispersion rotor 1B, the objects to be dispersed sent out from the grooves 5B on both sides do not cross each other. Therefore, in this embodiment, the objects to be dispersed from the grooves 5B on each surface are set to be sent into individually determined slits or through holes. Therefore, as shown in FIG. 13, the cylindrical main body 51 of the stator 50 forms the slits 54 and the through holes 56 alternately up and down along the circumference. That is, the object to be dispersed sent out from the groove 5B on the front surface side of the dispersion rotor 1B is set to be sent into the upper slit 54, and the object to be dispersed sent out from the groove 5B on the back surface side is set to be sent into the lower through hole 56. According to this configuration, the flow of the objects to be dispersed alternately sent out from the front and back surfaces of the dispersion rotor 1B is less likely to interfere with each other, and thus the discharge efficiency of the object to be dispersed to the outside of the stator is improved. In this embodiment, the slit 54 and the through hole 56 may be provided vertically at the same position, or may be a vertically long slit 54 in which the slit 54 and the through hole 56 are integrated.

[0079] In the above embodiment, the stator 50 may further incline the slit 54 slightly upward and the through hole 56 slightly downward. According to this configuration, the object to be dispersed passing through the slit 54 can contribute to the upward circulating flow in the tank, and the object to be dispersed passing through the through hole 56 can contribute to the downward circulating flow in the tank. Furthermore, since the slit 54 and the through hole 56 are refracted in the rotation direction and inclined upward or downward, torsion can be applied to the object to be dispersed passing through them, and the dispersion efficiency and the shearing efficiency can be increased.

[0080] In addition, when incorporating the distributed rotor 1B of the present embodiment into the distribution device 10, the stator 50 may use those of the above-described first and second embodiments.

[0081] (2) In each of the above embodiments, depending on the thickness of the distributed rotors 1, 1A, and 1B, the positions of the grooves 5A and 5B on the front and back surfaces may overlap at the same position instead of alternating.

[0082] (3) In the distributed rotors 1A and 1B of the second embodiment and the modification described above, the grooves 5A and 5B are shaped such that when viewed in plan from the axial center side of the rotation axis 30, they form a straight line that makes a tangent with the outer edge of the ring-shaped groove 4 and extends obliquely rearward. However, they may also be shaped like an arcuate shape that curves forward in the rotation direction and extends rearward.

[0083] (4) In each of the above embodiments, it is preferable that the surface of the convex portion 6 is made rough. In the present embodiment, the rough surface may be in any form as long as the area is expanded. For example, the surface may be rough and uneven, or a plurality of slits or irregularities may be provided. According to this configuration, the contact area between the object to be distributed and the convex portion 6 increases, and as a result, the frictional resistance increases, so the shearing ability is further improved.

[0084] (5) In each of the above embodiments, the distributed rotors 1, 1A, and 1B may be configured to form the grooves 5, 5A and the convex portions 6, 6A from the mounting portion 3 without having the ring-shaped groove 4.

[0085] (6) In each of the above embodiments, as shown in FIG. 14, the dispersion device 10 may include a pair of impellers 70 on the rotary shaft 30 with a dispersion rotor therebetween. As shown in FIG. 15, each impeller 70 has a plurality of spiral blades 72 on the outer periphery of each ring-shaped mounting portion 71. As shown in the plan view and front view of FIG. 16, the spiral blades 72 are set to have overlapping portions when viewed axially, at the rear portion of the front spiral blade 72A and the front portion of the rear spiral blade 72B of the adjacent spiral blades 72 in the front and rear directions. The number of spiral blades 72 is appropriately set and changed according to the size of the impeller 70 and the size of the spiral blades 72, etc., but 6 or more is preferable, and more preferably 8 or more.

[0086] According to this configuration, the pair of impellers 70 mounted on the rotary shaft 30 with the dispersion rotor 1 therebetween rotate at each of the openings of the top plate 52 and the bottom plate 53, thereby promoting the drawing-in of the object to be dispersed into the stator. That is, as the drawing-in of the object to be dispersed into the stator is promoted, the internal pressure of the stator 50 increases, accelerating the flow of the object to be dispersed. Also, as this internal pressure increases, the object to be dispersed tries to return from each opening of the top plate 52 and the bottom plate 53 to the outside of the stator. However, since each opening is in a state where the rear portion of the front spiral blade 72 of the adjacent spiral blades 72 covers the front portion of the rear spiral blade 72 when viewed in plan, each opening is in a state of being substantially blocked, and the object to be dispersed is suppressed from returning from the opening to the outside of the stator against the suction force. Therefore, the dispersion device 10 can continuously maintain the pressure inside the stator substantially constant, and thus can efficiently accelerate and send out the object to be dispersed through the groove 5 of the dispersion rotor 1.

[0087] (7) In each of the above embodiments, the collision portion 54B of the stator 50 is in a form that is refracted or bent only once obliquely forward in the rotation direction, but is not limited to this form, as long as the configuration is such that the object to be dispersed fed into the slit 54 is difficult to flow back upstream. Therefore, the number of refractions or bends of the collision portion 54B may be 1 or more. Also, the direction of refraction, etc. of the collision portion 54B may be a configuration that changes the direction step by step.

[0088] (8) In each of the above embodiments, the dispersion device may further be configured to include an auxiliary blade that assists the flow and agitation of the object to be dispersed in the tank. For example, as shown in FIG. 17, the dispersion device 10 of the present embodiment further includes an auxiliary blade 81, a rotating shaft 82 to which the auxiliary blade 81 is attached, and a power source 83 (e.g., a motor) for rotating the rotating shaft 82.

[0089] As shown in FIGS. 18 and 19, the auxiliary blade 81 is composed of a plurality of protruding pieces 81A formed on the outer periphery of a disk shape and vertical blades 81B formed by bending the outer edge side of the protruding pieces 81A alternately up and down along the circumferential direction. The protruding pieces 81A are in a saw blade shape, and the vertical blades 81B are in a rectangular shape. Note that the vertical blades 81B are refracted vertically from the protruding pieces 81A.

[0090] The rotating shaft 82 is inserted into the tank through a through hole formed in the upper lid 22 via a seal such as a gland packing or a mechanical seal. The auxiliary blade 81 is attached to the tip side of the rotating shaft 82.

[0091] The motor of the power source 83 is, for example, a motor or the like. A belt is suspended between the drive shaft of the motor and the rotating shaft 82, and the driving force is transmitted to the rotating shaft 82. Note that the motor may be directly connected to the rotating shaft 82. Therefore, the power source 83 of the present embodiment can adjust the rotation speed independently of the power source 40 for the dispersion unit. Note that the auxiliary blade 81 of the present embodiment may be rotated by the power source 40 for the dispersion unit. In the case of this configuration, the auxiliary blade 81 may be rotated at the same rotation speed as the rotation speed of the dispersion rotor 1, or the gear ratio may be adjusted by a gear box or the like, and the auxiliary blade 81 may be rotated at different rotation speeds.

[0092] According to this configuration, the auxiliary blade 81 assists the circulation flow of the object to be dispersed generated by the distributed unit composed of the distributed rotor 1 and the stator 50 as it rotates, and increases the flow. Further, as the auxiliary blade 81 rotates, the object to be dispersed is sheared by the saw-tooth-shaped protruding pieces 81A and the vertical blades 81B. Therefore, since the dispersing device of the present embodiment performs the dispersing process by the distributed unit and the dispersing process accompanying the rotation of the auxiliary blade 81 simultaneously, the processing efficiency is further improved.

[0093] (9) In each of the above embodiments, the dispersing device has a configuration in which the tank 20 is provided with the jacket 21, but it may have a configuration without the jacket 21. Further, each of the above embodiments may have a configuration without the upper lid 22 and the seal of the tank 20.

Explanation of reference numerals

[0094] 1, 1A, 1B Distributed rotor 2 Through hole 3 Mounting portion 4 Ring-shaped groove 5, 5A, 5B Groove 6 Protrusion 10 Dispersing device 20 Tank 21 Jacket 22 Upper lid 23 Discharge portion 30 Rotating shaft 40 Power source 50 Stator 51 Cylindrical body 52 Top plate 53 Bottom plate 54 Slit 54A Receiving portion 54B Collision portion 60 Stator rod 70 Impeller 81 Auxiliary blade

Claims

1. A stator comprising a cylindrical main body having a ring-shaped top plate and a bottom plate that are suspended and held in a bottomed cylindrical tank in which a dispersion target is stored, and a rotary shaft that is fixed to a rotary shaft passing through the top plate and the bottom plate and rotates within the stator to draw the dispersion target drawn into the stator toward the cylindrical main body of the stator. A dispersion unit for a media-less type dispersion device, comprising a disk-shaped dispersion rotor that feeds out the dispersion target, The dispersion rotor has a plurality of grooves formed radially from the side of the rotary shaft toward the outer periphery on each surface facing the top plate and the bottom plate, The stator is formed with a plurality of slits or through-holes that become narrower from the inside to the outside of the cylindrical main body, and discharges the dispersion target sent out from the outlets of the plurality of grooves through the slits or the through-holes A dispersion unit for a media-less type dispersion device, characterized in that

2. Each of the plurality of slits or through-holes of the stator is formed such that its inner inlet is larger than the outlet of the groove of the dispersion rotor The dispersion unit for a media-less type dispersion device according to claim 1, characterized in that

3. The plurality of slits or through-holes of the stator include a receiving portion that receives the dispersion target sent out from the grooves of the dispersion rotor in the same direction, A collision portion that collides the dispersion target received by the receiving portion until it is discharged outside the stator, The dispersion unit for a media-less type dispersion device according to claim 1 or claim 2, characterized in that it has

4. The receiving portion and the collision portion form a communicating flow path, The receiving portion receives and flows the dispersion target sent out rearward from the groove rearward, The collision portion reverses the flow of the dispersion target received by the receiving portion forward The dispersion unit for a media-less type dispersion device according to claim 3, characterized in that

5. The dispersion rotor has fan-shaped convex portions between adjacent grooves, and the convex portions have a surface area larger than the opening area of the grooves when the dispersion rotor is viewed in plan from the axial center side of the rotary shaft, The top plate and the bottom plate of the stator have inner walls facing the surface of the convex portion The dispersion unit for a media-less type dispersion device according to claim 1, characterized in that

6. The dispersion rotor has a tapered shape that tapers from the rotation axis side toward the outer periphery when viewed from the front in a direction orthogonal to the rotation axis. Each inner wall of the top plate and the bottom plate is formed in a tapered shape that faces each tapered surface of the dispersion rotor. The dispersion unit for a media-less type dispersion device according to claim 5, characterized in that.

7. The dispersion rotor has a ring-shaped groove formed around the rotation axis for receiving the object to be dispersed that is drawn along the rotation axis as it rotates. The outer edge of the ring-shaped groove communicates with the plurality of grooves. In each opening of the top plate and the bottom plate of the stator, a pair of impellers having a plurality of spiral blades on the outer periphery of each ring-shaped mounting portion mounted on the rotation axis with the dispersion rotor interposed therebetween. The dispersion unit for a media-less type dispersion device according to claim 1, characterized in that.

8. Each of the spiral blades has a length such that when viewed in plan from the axial direction of the rotation axis, the front portion of the rear spiral blade is covered by the rear portion of the front spiral blade adjacent to the rear spiral blade in the front-rear direction. The dispersion unit for a media-less type dispersion device according to claim 7, characterized in that.

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