Mixing device

Abstract

To prevent a material from remaining at a bottom of a mixing chamber when the material is discharged from the mixing chamber.SOLUTION: A mixing device 1 has a mixing chamber 10 in which a material is mixed. The mixing chamber 10 has a mixing chamber bottom 30, and a mixing chamber discharge port 20 provided at the mixing chamber bottom 30. A direction in which a rotation axis of each of rotors 40 disposed inside the mixing chamber 10 extends is defined as a rotor axis direction (X). The mixing chamber bottom 30 has a material discharge inclined portion 137. The material discharge inclined portion 137 inclines downward (Z2) toward the mixing chamber discharge port 20 from an outside portion of the mixing chamber bottom 30 in the rotor axis direction (X) when viewed from a direction (Y) perpendicular to each of the rotor axis direction (X) and a vertical direction (Z).SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a mixing device for mixing materials. [Background technology]

[0002] For example, Patent Document 1 describes that a material (rubber in the document) is discharged from a discharge port of a mixing chamber (kneading chamber in the document) of a mixing device (a rubber kneader in the document). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-218691 Summary of the Invention [Problem to be solved by the invention]

[0004] When discharging material from the mixing chamber, the material at the bottom of the mixing chamber may not enter the discharge port and may remain at the bottom of the mixing chamber.

[0005] Therefore, an object of the present invention is to provide a mixing device that can prevent material from remaining at the bottom of the mixing chamber when the material is discharged from the mixing chamber. [Means for solving the problem]

[0006] The mixing device includes a mixing chamber in which materials are mixed. The mixing chamber includes a mixing chamber bottom and a mixing chamber discharge port. The mixing chamber bottom is a lower portion of the mixing chamber. The mixing chamber discharge port is provided at the mixing chamber bottom, and allows the materials to pass through. The direction in which the rotation axis of a rotor disposed inside the mixing chamber extends is defined as the rotor axial direction. The mixing chamber bottom includes a material discharge inclined portion. When viewed from directions perpendicular to both the rotor axial direction and the vertical direction, the material discharge inclined portion slopes downward from an outer portion of the mixing chamber bottom in the rotor axial direction toward the mixing chamber discharge port. [Effects of the Invention]

[0007] The above-described mixing device can prevent the material from remaining at the bottom of the mixing chamber when the material is discharged from the mixing chamber. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a cross-sectional view of the mixer 1 as seen from the front-rear direction X. FIG. [Figure 2] FIG. 2 is an enlarged view of a portion F2 shown in FIG. [Figure 3] 2, and is a view of the mixing chamber bottom 30 and the like shown in FIG. 1 as seen from the upper side Z1. [Figure 4] 2, and is a view of the mixing chamber bottom 30 and the like shown in FIG. 1 as seen from the right side Y2. [Figure 5] 4 and shows the lid upper part 80u and the like of Modified Example 1. FIG. [Figure 6] 2 and shows a lid upper portion 80u and the like of a second modified example. [Figure 7] 4 and shows the lid upper portion 80u and the like of Modified Example 2, and is a view taken along arrow F7 in FIG. 5. DETAILED DESCRIPTION OF THE INVENTION

[0009] A mixing device 1 according to an embodiment will be described with reference to FIGS.

[0010] As shown in Fig. 1, the mixer 1 is a device for mixing materials. The "mixing" performed by the mixer 1 may be kneading (the mixer 1 may be a kneading device) or stirring (the mixer 1 may be a stirring device). The mixer 1 is, for example, a batch type.

[0011] The materials to be mixed in this mixing device 1 include, for example, a main material and an auxiliary material. The main material includes, for example, a polymer material, and specifically includes, for example, rubber (such as tire rubber) or resin. The auxiliary material is an additive (compounding agent) added (compounded) to the main material. The auxiliary material may contain inorganic substances or organic substances. Specifically, for example, when the main material is rubber, the auxiliary materials are silica, coupling agent, vulcanizing agent, etc. For example, the mixing device 1 may be a rubber kneading device or a resin kneading device.

[0012] This mixing device 1 uses a working fluid to mix materials. For example, the working fluid used in the mixing device 1 is a fluid in a supercritical state (supercritical fluid) or a fluid in a subcritical state (subcritical fluid). Note that the working fluid used in the mixing device 1 may be a fluid that is neither a supercritical fluid nor a subcritical fluid. Hereinafter, mainly the case where the working fluid is a supercritical fluid or a subcritical fluid will be described.

[0013] The temperature of the supercritical fluid is above the critical temperature (Tc), and the pressure of the supercritical fluid is above the critical pressure (Pc). The supercritical fluid has the characteristics of both a liquid and a gas. The supercritical fluid has the ability to dissolve solutes (solubility) similar to that of a liquid and the ability to diffuse solutes (diffusibility) similar to that of a gas. The characteristics (solubility and diffusibility) of the subcritical fluid are almost the same as those of the supercritical fluid. The temperature T and pressure P of the subcritical fluid satisfy, for example, any of the following conditions. The units of temperature T and critical temperature Tc in each of the following examples are in degrees Celsius. [Example 1 of subcritical state] Satisfies T≥Tc and P<Pc. [Example 2 of subcritical state] Satisfies T<Tc, P<Pc, T is sufficiently higher than room temperature, and P is sufficiently higher than normal pressure (atmospheric pressure). [Example 3 of subcritical state] Satisfies 0.5<T / Tc<1.0 and 0.5<P / Pc. [Example 4 of subcritical state] Satisfies 0.5<T / Tc and 0.5<P / Pc<1.0. [Example 5 of subcritical state] When the critical temperature Tc is below 0°C, satisfies 0.5<P / Pc.

[0014] It is preferable that the substance constituting the working fluid be one that can be brought into a supercritical or subcritical state as easily as possible. The difference between the polarity of the working fluid and the polarity of the material is small enough that the material can be dissolved in the working fluid. An example of a substance constituting the working fluid is carbon dioxide. The critical temperature (Tc) of carbon dioxide is 31°C. The critical pressure (Pc) of carbon dioxide is 7.4 MPa. Carbon dioxide is in a subcritical state, for example, at 31°C or higher and 7.1 MPa or higher. Carbon dioxide is in a subcritical state, for example, at 20°C, if the pressure is 15 MPa or higher. Note that the substance constituting the working fluid does not have to be carbon dioxide, and may be, for example, nitrogen.

[0015] In this mixing device 1, the working fluid in a supercritical or subcritical state swells with the materials, melts (plasticizes) the materials, and mixes the materials in a state where the viscosity of the materials is reduced. The working fluid is preferably in a supercritical state rather than a subcritical state. When the working fluid is in a supercritical state, the materials are mixed more thoroughly than when the working fluid is in a subcritical state. Hereinafter, the "supercritical or subcritical state" will also be referred to as "supercritical state, etc."

[0016] The mixer 1 includes a chamber 5, a rotor 40, a material input device 50, and a material discharge device 60.

[0017] (direction) The directions related to the mixer 1 are defined as follows: The vertical direction is the up-down direction Z. The top (vertically upward, upward) in the up-down direction Z is the upper side Z1, and the bottom (vertically downward, downward) in the up-down direction Z is the lower side Z2. The direction in which the rotation shafts of the rotor 40 (specifically, the first rotor rotation shaft 41a and the second rotor rotation shaft 42a described below) extend is the front-rear direction X (rotor axial direction). One side (one direction) in the front-rear direction X is the front side X1 (first rotor axial direction side), and the side opposite the front side X1 is the rear side X2 (second rotor axial direction side). The direction intersecting (for example, perpendicular to) the front-rear direction X and the up-down direction Z is the left-right direction Y. The left-right direction Y is a lateral direction intersecting the front-rear direction X (rotor axial lateral direction). When the mixer 1 includes two rotors 40 (a first rotor 41 and a second rotor 42 described later) arranged side by side, the left-right direction Y is the direction in which the two rotors 40 face each other (the rotor facing direction). One side in the left-right direction Y is the left side Y1 (the first side in the rotor facing direction), and the side opposite the left side Y1 is the right side Y2 (the second side in the rotor facing direction).

[0018] The chamber 5 is a container for mixing materials. The chamber 5 includes a mixing chamber 10.

[0019] The mixing chamber 10 is a portion where materials are mixed. The mixing chamber 10 is a portion where materials are mixed in the presence of a working fluid. The mixing chamber 10 is a portion where materials are mixed in the presence (atmosphere) of a working fluid in a supercritical or subcritical state. The mixing chamber 10 is disposed inside the chamber 5. The mixing chamber 10 includes a space (mixing space) in which the materials are mixed and an inner surface of the chamber 5 that forms (surrounds) the mixing space. The mixing chamber 10 has a shape that can accommodate the rotor 40. For example, if the mixer 1 has two rotors 40 (a first rotor 41 and a second rotor 42), the mixing chamber 10 has a shape that can accommodate the two rotors 40. Specifically, when viewed from the front-to-back direction X, the mixing chamber 10 has a shape like two circles lined up in the left-to-right direction Y (like glasses). When the materials are mixed in the mixing chamber 10 (also referred to as "during material mixing"), the mixing chamber 10 is sealed. For example, the mixing chamber 10 is sealed so that the working fluid inside the mixing chamber 10 can be maintained in a state such as a supercritical state. The mixing chamber 10 includes a mixing chamber inlet 10a, a mixing chamber outlet 20, and a mixing chamber bottom 30.

[0020] The mixing chamber inlet 10a is a portion for introducing materials from the outside to the inside of the mixing chamber 10. The mixing chamber inlet 10a is an opening (hole, through-hole) through which materials can pass. The mixing chamber inlet 10a is provided in the upper Z1 portion of the mixing chamber 10.

[0021] The mixing chamber outlet 20 is a portion for discharging materials from the inside to the outside of the mixing chamber 10. The mixing chamber outlet 20 is an opening (hole, through-hole) through which materials can pass. When the mixer 1 includes two rotors 40 (a first rotor 41 and a second rotor 42), the mixing chamber outlet 20 is disposed within a range of the right side Y2 of the first rotor rotation axis 41a and the left side Y1 of the second rotor rotation axis 42a of the mixing chamber bottom 30. The mixing chamber outlet 20 is provided only in a part of the mixing chamber bottom 30 (see FIG. 3). Details of the mixing chamber outlet 20 will be described later.

[0022] The mixing chamber bottom 30 is the lower Z2 portion (bottom) of the mixing chamber 10. The mixing chamber bottom 30 is the lower Z2 portion of the inner surface of the chamber 5. The mixing chamber bottom 30 is the portion where the mixing chamber discharge port 20 is provided, and is the peripheral portion of the mixing chamber discharge port 20.

[0023] The rotor 40 mixes the materials. The rotor 40 is arranged (housed) inside the mixing chamber 10. The rotor 40 mixes the materials by rotating relative to the mixing chamber 10. For example, a plurality of rotors 40 are provided, and in the example shown in FIG. 1, two rotors 40 are provided, but three or more rotors may be provided. The multiple rotors 40 are arranged parallel to each other. Only one rotor 40 may be provided. The rotor 40 is screw-shaped. When a plurality of rotors 40 are provided, each of the multiple rotors 40 is screw-shaped. Of the multiple rotors 40, two adjacent rotors 40 are referred to as a first rotor 41 and a second rotor 42.

[0024] The first rotor 41 is one of the multiple rotors 40. The first rotor 41 rotates around a first rotor rotation shaft 41a. The first rotor 41 is provided so as to extend in the direction in which the first rotor rotation shaft 41a extends (the front-rear direction X). The first rotor rotation shaft 41a is the rotation shaft of the first rotor 41 relative to the mixing chamber 10 (relative to the chamber 5).

[0025] The second rotor 42 is one of the multiple rotors 40 and is provided separately from the first rotor 41. The second rotor 42 rotates around a second rotor rotation shaft 42a. The second rotor 42 is provided to extend in the direction in which the second rotor rotation shaft 42a extends (the front-rear direction X). The second rotor rotation shaft 42a is the rotation shaft of the second rotor 42 relative to the mixing chamber 10 (relative to the chamber 5). The second rotor 42 rotates in the opposite direction to the rotation direction of the first rotor 41. Specifically, for example, when viewed from one side in the front-rear direction X, if the first rotor 41 rotates clockwise, the second rotor 42 rotates counterclockwise. The second rotor 42 is arranged parallel to the first rotor 41. More specifically, the direction in which the first rotor rotation shaft 41a extends and the direction in which the second rotor rotation shaft 42a extends are parallel. The second rotor 42 is arranged adjacent to the first rotor 41 in the left-right direction Y.

[0026] The material feeding device 50 is a device (material feeding mechanism) for feeding material from the outside to the inside of the mixing chamber 10. The material feeding device 50 includes a ram support portion 51, a material feeding portion 53, and a ram 55.

[0027] The ram support part 51 supports the ram 55 so that the ram 55 can open and close the mixing chamber inlet 10a. For example, the ram support part 51 supports the ram 55 so that it can move in the vertical direction Z. The ram support part 51 is fixed to the chamber 5. The ram support part 51 is disposed so as to extend from the chamber 5 to the upper side Z1. The ram support part 51 is tubular, for example, cylindrical.

[0028] The material charging section 53 is a section (opening, material charging port) through which the material is charged. The interior of the material charging section 53 communicates with the interior of the ram support section 51. The material charging section 53 branches off from the ram support section 51. The interior of the material charging section 53 communicates with the interior of the mixing chamber 10 (mixing space) via the interior of the ram support section 51 and the mixing chamber charging port 10a.

[0029] The ram 55 opens and closes the mixing chamber inlet 10a. The ram 55 opens and closes the mixing chamber inlet 10a by moving toward or away from the mixing chamber 10. For example, the ram 55 opens and closes the mixing chamber inlet 10a by moving in the vertical direction Z relative to the mixing chamber 10.

[0030] The material discharge device 60 is a device (material discharge mechanism) for discharging material from the inside to the outside of the mixing chamber 10. The material discharge device 60 includes a lid support passage 61, a material discharge section 63, the lid support passage 61, and a lid 80.

[0031] The lid support passage 61 supports the lid 80 so that the lid 80 can open and close the mixing chamber outlet 20. The lid support passage 61 communicates with the interior (mixing space) of the mixing chamber 10. The lid support passage 61 is a passage for materials to be discharged from the mixing chamber 10. The lid support passage 61 includes a passage within the chamber 5 (specifically, the mixing chamber outlet 20) and a lid support portion 61a. The mixing chamber outlet 20 is included in the lid support passage 61.

[0032] The lid support part 61a is fixed to the chamber 5. The lid support part 61a may be separate from the chamber 5, or may be integral with the chamber 5. The lid support part 61a is arranged to extend downward Z2 from the chamber 5. The lid support part 61a is tubular, for example, cylindrical.

[0033] The material discharge section 63 is a section (opening, material discharge port) through which material is discharged from the inside of the mixing chamber 10. The material discharge section 63 is a section through which material that has passed through the mixing chamber discharge port 20 is discharged. The interior of the material discharge section 63 communicates with the interior of the lid support passage 61 (e.g., lid support section 61a). The material discharge section 63 branches off from the lid support passage 61 (e.g., lid support section 61a). The interior of the material discharge section 63 communicates with the interior of the mixing chamber 10 (mixing space) via the lid support passage 61.

[0034] The seal 67 seals or nearly seals the gap between the lid support passage 61 and the lid 80 (hereinafter, "seals" may include nearly seals). For example, the seal 67 is a packing, such as a burr seal. The seal 67 is a member for maintaining airtightness inside the mixing chamber 10. More specifically, the seal 67 seals the gap between the inner periphery of the lid support passage 61 and the outer periphery of the lid 80 (the lid outer periphery 181 described below) when the lid 80 is in a closed state (described below). When the lid 80 is in a closed state, the seal 67 contacts (more specifically, makes surface contact with) both the inner periphery of the lid support passage 61 and the lid outer periphery 181. When the lid 80 moves in the vertical direction Z, the lid 80 slides against the inner periphery of the seal 67. The seal 67 is located above Z1 the position where the material discharge section 63 branches off from the lid support passage 61. In the example shown in FIG. 1, the seal 67 is disposed on the inner periphery of the lid support passage 61 (mixing chamber outlet 20) in the chamber 5. The seal 67 may be disposed on the inner periphery of the lid support passage 61 in the lid support portion 61a. The seal 67 is fixed or approximately fixed to the inner periphery of the lid support passage 61. The seal 67 may be fixed or approximately fixed to the outer periphery of the lid 80. Only one seal 67 may be provided, or multiple seals 67 may be provided.

[0035] The seal 67 is ring-shaped. When viewed from the vertical direction Z, the seal 67 is circumferential, approximately circumferential, elliptical, or approximately elliptical. Hereinafter, the circumferential, approximately circumferential, elliptical, or approximately elliptical shape will also be referred to as "circumferential, etc." When the seal 67 is circumferential, etc., the airtightness of the seal 67 can be made uniform (or approximately uniform) around the entire circumference of the seal 67. For example, when the working fluid is under high pressure (e.g., when the working fluid is in a supercritical state), ensuring airtightness by the seal 67 is important. Also, when the viscosity of the material is low (e.g., when the material is powdery or liquid), ensuring airtightness by the seal 67 is important. Even in these cases, when the seal 67 is circumferential, etc., the seal 67 (e.g., a high-pressure seal) can ensure airtightness inside the mixing chamber 10.

[0036] The seal 67 is configured to expand radially inward and outward due to, for example, the pressure inside the mixing chamber 10. The seal 67 is configured to press against the outer periphery of the lid 80 (lid outer periphery 181) and against the inner periphery of the lid support passage 61. The seal 67 has a seal recess 67a.

[0037] The seal recess 67a (seal opening) is a recess provided in a portion of the seal 67 on the mixing chamber 10 side. The seal recess 67a is recessed from the end of the seal 67 on the upper side Z1 (on the mixing chamber 10 side) to the lower side Z2 (on the opposite side from the mixing chamber 10). The pressure inside the mixing chamber 10 presses against the inner surface of the seal recess 67a, causing the seal 67 to expand radially inward and outward. The seal 67 may be provided with a spring (not shown). This spring is disposed (built-in) inside the seal recess 67a. This spring presses against the inner surface of the seal recess 67a so that the seal 67 expands radially inward and outward.

[0038] The lid 80 (door, discharge door) opens and closes the mixing chamber discharge port 20. The lid 80 opens and closes the mixing chamber discharge port 20 by moving toward or away from the mixing chamber 10. The lid 80 opens and closes the mixing chamber discharge port 20 by moving in the vertical direction Z relative to the mixing chamber 10. The lid 80 is inserted into the lid support passage 61 so as to be movable in the vertical direction Z.

[0039] When the materials are being mixed, the lid 80 is in a state in which it closes the mixing chamber discharge port 20 (closed state). The position of the lid 80 in the closed state is, for example, the uppermost position Z1 within the movable range of the lid 80 in the up-down direction Z. When the materials are being discharged from the mixing chamber 10 (also referred to as "when discharging materials"), the lid 80 is in a state in which it opens the mixing chamber discharge port 20 (open state). The position of the lid 80 in the open state is lower Z2 than the position of the lid 80 in the closed state. When the lid 80 is in the open state, the lid upper portion 80u (described below) is located lower Z2 than the entrance to the material discharge section 63 (the position where the material discharge section 63 branches off from the lid support passage 61).

[0040] The lid 80 is provided so as to extend in the vertical direction Z. The lid 80 is rod-shaped or approximately rod-shaped. The cross section of the lid 80 as viewed from the vertical direction Z is, for example, circular, or may be approximately circular, elliptical, or approximately elliptical. Only one lid 80 is provided on the mixing device 1. Note that a plurality of lids 80 may be provided on the mixing device 1. The lid 80 includes a lid upper portion 80u.

[0041] The lid upper portion 80u is the upper side Z1 portion of the lid 80 (details will be described later).

[0042] (Mixing ingredients) The operation of the mixer 1 and the movement of the materials when mixing the materials are as follows. The materials are mixed by the rotor 40, for example, in the presence of a high-pressure working fluid. More specifically, the materials and working fluid are placed inside the mixing chamber 10. The ram 55 closes the mixing chamber inlet 10a, and the lid 80 closes the mixing chamber outlet 20, sealing the mixing chamber 10. In this state, the rotor 40 rotates relative to the mixing chamber 10. As the rotor 40 rotates, the materials move around the rotation axis of the rotor 40. At this time, the direction of movement of the materials by the first rotor 41 (for example, clockwise) and the direction of movement of the materials by the second rotor 42 (for example, counterclockwise) are opposite to each other. Furthermore, the materials move in the forward and backward direction X as the screw-shaped rotor 40 rotates. At this time, the direction of movement of the material in the front-rear direction X by the first rotor 41 (for example, front side X1) and the direction of movement of the material in the front-rear direction X by the second rotor 42 (for example, rear side X2) are opposite to each other.

[0043] (material discharge) The operation of the mixer 1 and the movement of the materials when discharging the materials are as follows: The lid 80 is in a state in which the mixing chamber outlet 20 is open (open state). The rotor 40 rotates relative to the mixing chamber 10, for example, at a slower speed than when mixing the materials. The materials move with the rotation of the rotor 40 and are discharged from the inside of the mixing chamber 10 through the mixing chamber outlet 20 to the outside of the mixing chamber 10. The materials pass through the lid support passage 61 from the mixing chamber outlet 20 and are discharged to the material discharge section 63.

[0044] 3, the mixing chamber outlet 20 is provided only in a part of the mixing chamber bottom 30. More specifically, the mixing chamber outlet 20 is provided only in a part of the range of the mixing chamber bottom 30 in the front-to-rear direction X. For example, the mixing chamber outlet 20 is provided in the center of the mixing chamber bottom 30 in the front-to-rear direction X, and is not provided in outer parts of the mixing chamber bottom 30 in the front-to-rear direction X (for example, the front side X1 and rear side X2 parts). As a result, the area of ​​the mixing chamber outlet 20 when viewed from the up-down direction Z is smaller than when the mixing chamber outlet 20 is provided over the entire or substantially the entire range of the mixing chamber bottom 30 in the front-to-rear direction X.

[0045] An example of the reason why mixing chamber outlet 20 is provided only in a portion of mixing chamber bottom 30 is as follows. When mixing materials, it is important to seal mixing chamber 10 shown in FIG. 1 (to increase airtightness). In particular, as described above, it is important to seal mixing chamber 10 when the working fluid is under high pressure and / or when the viscosity of the material is low. For this reason, it is preferable that seal 67, the inner periphery of mixing chamber outlet 20 (mixing chamber outlet inner periphery 121) shown in FIG. 3, and the outer periphery of lid 80 (lid outer periphery 181) are circumferential or the like when viewed from the vertical direction Z. If the inner periphery of mixing chamber outlet 20 is circumferential or the like when viewed from the vertical direction Z, mixing chamber outlet 20 will be provided only in a portion of mixing chamber bottom 30. Specifically, the mixing chamber bottom 30 is usually quadrangular (e.g., rectangular) when viewed in the up-down direction Z, and is long in the front-to-rear direction X (the longitudinal direction of the mixing chamber bottom 30 is the front-to-rear direction X). As a result, the mixing chamber discharge port 20 is provided in only a part of the range of the mixing chamber bottom 30 in the front-to-rear direction X.

[0046] If the mixing chamber discharge port 20 is provided only in a portion of the range of the mixing chamber bottom 30 in the front-to-rear direction X, there is a risk that the material will remain (become incomplete, difficult to discharge, or accumulate) on the mixing chamber bottom 30 in a portion where the mixing chamber discharge port 20 is not present when the material is discharged. Specifically, there is a risk that the material (material pushed outward in the front-to-rear direction X) will remain on the mixing chamber bottom 30 in a position shifted in the front-to-rear direction X from the mixing chamber discharge port 20. In the example shown in Fig. 3, there is a risk that the material will remain on the mixing chamber bottom 30 in positions X1 and X2 on the front side and rear side of the mixing chamber discharge port 20.

[0047] Therefore, in the mixer 1, as shown in FIG. 4, the mixing chamber bottom 30 is configured so as to prevent the material from remaining on the mixing chamber bottom 30 at a position shifted in the front-rear direction X from the mixing chamber outlet 20.

[0048] (Details of the shape of the mixing chamber bottom 30, etc.) As described above, the mixing chamber 10 includes a mixing chamber outlet 20 and a mixing chamber bottom 30 .

[0049] As described above, the mixing chamber outlet 20 is provided in only a part of the mixing chamber bottom 30. Specifically, the mixing chamber outlet 20 is disposed at only a part of the mixing chamber bottom 30 in the front-to-rear direction X. In the example shown in FIG. 4, the mixing chamber outlet 20 is disposed at the center of the mixing chamber bottom 30 in the front-to-rear direction X. Note that the mixing chamber outlet 20 may be disposed at a position shifted in the front-to-rear direction X from the center of the mixing chamber bottom 30 in the front-to-rear direction X. As shown in FIG. 3, the mixing chamber outlet 20 includes a mixing chamber outlet inner periphery 121.

[0050] Mixing chamber outlet inner periphery 121 is the inner periphery (inner periphery) of mixing chamber outlet 20. Mixing chamber outlet inner periphery 121 has a circumferential shape (circumferential, approximately circular, elliptical, or approximately elliptical) when viewed from the vertical direction Z. As shown in Fig. 4, the upper end (end on the upper side Z1) of mixing chamber outlet inner periphery 121 is defined as mixing chamber outlet inner periphery upper end 121t.

[0051] As described above, the mixing chamber bottom 30 is the lower Z2 portion of the mixing chamber 10. The outer end of the mixing chamber bottom 30 in the front-rear direction X is defined as a bottom front-rear direction end 130a. As shown in Fig. 2, the mixing chamber bottom 30 includes bottom left-right inclined portions 133, a bottom ridge portion 135, and a material discharge inclined portion 137 (see Fig. 4).

[0052] The bottom left-right inclined portion 133 is a portion that is inclined with respect to the left-right direction Y when viewed from the front-rear direction X. For example, as shown in FIG. 1, the bottom left-right inclined portion 133 is provided at a position between two rotors 40 (the first rotor 41 and the second rotor 42). Specifically, the bottom left-right inclined portion 133 is disposed to the lower right of the first rotor rotation shaft 41a (the right side Y2 and the lower side Z2) and to the lower left of the second rotor rotation shaft 42a (the left side Y1 and the lower side Z2). The bottom left-right inclined portion 133 is inclined downward Z2 outward in the left-right direction Y (it is inclined with respect to the left-right direction Y so as to be positioned more toward the lower side Z2 as it moves outward in the left-right direction Y). The bottom left-right inclined portion 133 may be linear (see FIG. 2) or curved (for example, broken line-like, arc-like, etc.) when viewed from the front-rear direction X. The bottom left / right inclined portion 133 may be arc-shaped when viewed from the front-rear direction X. For example, it may be arc-shaped or approximately arc-shaped with the rotation axes (first rotor rotation shaft 41a and second rotor rotation shaft 42a) of the rotors 40 as its center. When the bottom left / right inclined portion 133 is provided between two rotors 40, the bottom left / right inclined portion 133 is provided on the left and right (on both sides in the left-right direction Y). In this case, as shown in FIG. 2, the bottom left / right inclined portion 133 includes a bottom left inclined portion 133a and a bottom right inclined portion 133b. The bottom left inclined portion 133a is inclined downward Z2 toward the left side Y1. The bottom right inclined portion 133b is inclined downward Z2 toward the right side Y2.

[0053] The bottom ridge 135 is the upper end of the bottom left and right inclined portions 133. When viewed from the front-rear direction X, the bottom ridge 135 is the intersection of the bottom left inclined portion 133a and the bottom right inclined portion 133b. As shown in FIG. 3, the bottom ridge 135 is disposed so as to extend in the front-rear direction X.

[0054] As shown in FIG. 4 , the material discharge inclined portion 137 (bottom front-rear inclined portion) is a portion that is inclined with respect to the front-rear direction X when viewed from the left-right direction Y (side view). When viewed from the left-right direction Y, the material discharge inclined portion 137 inclines (vertically downward) from an outer portion of the mixing chamber bottom 30 in the front-rear direction X toward the mixing chamber outlet 20 on the lower side Z2. The material discharge inclined portion 137 inclines with respect to the front-rear direction X so that the closer it is to the mixing chamber outlet 20, the lower it is positioned on the lower side Z2. The "outer portion of the mixing chamber bottom 30 in the front-rear direction X" may be the bottom front-rear end 130a, or may be a position close to the bottom front-rear end 130a (approximately the outer end of the mixing chamber bottom 30 in the front-rear direction X).

[0055] This material discharge inclined portion 137 is a portion that is inclined with respect to the front-rear direction X when viewed from the left-right direction Y, and details of "when viewed from the left-right direction Y" are as follows. The material discharge inclined portion 137 is inclined with respect to the front-rear direction X in a cross section viewed from the left-right direction Y and passing through the mixing chamber discharge outlet 20 (e.g., the center of the mixing chamber discharge outlet 20). For example, the bottom ridge portion 135 is inclined downward Z2 toward the mixing chamber discharge outlet 20, and this bottom ridge portion 135 is included in the material discharge inclined portion 137. Furthermore, in a cross section viewed from the left-right direction Y, passing through the mixing chamber discharge outlet 20, and at a position shifted in the left-right direction Y from the bottom ridge portion 135, the upper end of the mixing chamber bottom 30 may be inclined downward Z2 toward the mixing chamber discharge outlet 20. The inclination of the upper end of the mixing chamber bottom 30 in this cross section may be included in the material discharge inclined portion 137.

[0056] The provision of this material discharge inclined portion 137 makes it easier for the material to be discharged to the mixing chamber discharge port 20. More specifically, the material on the mixing chamber bottom 30, which is offset in the front-to-back direction X from the mixing chamber discharge port 20, moves by gravity along the material discharge inclined portion 137 toward the mixing chamber discharge port 20. Therefore, the material is less likely to remain on the mixing chamber bottom 30 in a position offset in the front-to-back direction X from the mixing chamber discharge port 20, and is more likely to be discharged from the mixing chamber discharge port 20. This makes it possible to completely or almost completely discharge the material from the mixing chamber 10.

[0057] The material discharge inclined portion 137 may be linear or curved when viewed from the left-right direction Y. The material discharge inclined portion 137 may be polygonal or arc-shaped (circular arc, approximately circular arc, etc.) when viewed from the left-right direction Y.

[0058] For example, the material discharge inclined portion 137 may be provided on the front side X1 and rear side X2 of the mixing chamber discharge port 20. In this case, the material discharge inclined portion 137 includes a front material discharge inclined portion 137a and a rear material discharge inclined portion 137b. The material discharge inclined portion 137 also includes a material discharge inclined portion upper end portion 137t.

[0059] The front material discharge inclined portion 137a (bottom front inclined portion) is located on the front side X1 of the mixing chamber discharge outlet 20. When viewed from the left-right direction Y, the front material discharge inclined portion 137a inclines downward Z2 from the front side X1 portion of the mixing chamber bottom 30 (for example, the bottom front-rear direction end 130a on the front side X1) toward the rear side X2 (i.e., toward the mixing chamber discharge outlet 20). The rear material discharge inclined portion 137b (bottom rear inclined portion) is located on the rear side X2 of the mixing chamber discharge outlet 20. When viewed from the left-right direction Y, the rear material discharge inclined portion 137b inclines downward Z2 from the rear side X2 portion of the mixing chamber bottom 30 (for example, the bottom front-rear direction end 130a on the rear side X2) toward the front side X1 (i.e., toward the mixing chamber discharge outlet 20). In addition, when the mixing chamber discharge outlet 20 is positioned at the end of the mixing chamber bottom 30 in the front-to-back direction X (the end on the front side X1 or rear side X2), only one of the front material discharge inclined portion 137a and the rear material discharge inclined portion 137b may be provided.

[0060] The material discharge inclined portion upper end 137t is the upper end (upper Z1 end) of the material discharge inclined portion 137. The material discharge inclined portion upper end 137t is the uppermost Z1 portion of the material discharge inclined portion 137. For example, the material discharge inclined portion upper end 137t is located at the position of the material discharge inclined portion 137 that is farthest from the mixing chamber discharge outlet 20. In the example shown in FIG. 4, the material discharge inclined portion upper end 137t is the upper end of the front X1 end of the front material discharge inclined portion 137a and the upper end of the rear X2 end of the rear material discharge inclined portion 137b.

[0061] As described above, the lid upper portion 80u is the upper Z1 portion of the lid 80 (see FIG. 1). As shown in FIG. 3, the lid upper portion 80u includes a lid outer peripheral portion 181, lid left and right inclined portions 183 (see FIG. 2), and a lid ridge portion 185.

[0062] The lid outer peripheral portion 181 is the outer peripheral portion of the lid upper portion 80u (of the lid 80). When viewed from the vertical direction Z, the lid outer peripheral portion 181 has a circumferential shape or the like (circumferential, approximately circular, elliptical, or approximately elliptical) shape. As shown in FIG. 4, the upper end of the lid outer peripheral portion 181 is referred to as a lid outer peripheral upper end portion 181t (described later).

[0063] As shown in FIG. 2, the lid left-right inclined portion 183 is a portion inclined in the left-right direction Y when viewed from the front-rear direction X. The lid left-right inclined portion 183 is configured similarly to the bottom left-right inclined portion 133. The lid left-right inclined portion 183 inclines downward Z2 toward the outside in the left-right direction Y (it inclines in the left-right direction Y so that the further outward in the left-right direction Y it is positioned on the lower Z2). When the lid left-right inclined portion 183 is provided at a position between two rotors 40 (see FIG. 1), the lid left-right inclined portion 183 is provided on the left and right (on both sides in the left-right direction Y). In this case, the lid left-right inclined portion 183 includes a lid left-side inclined portion 183a and a lid right-side inclined portion 183b. The lid left-side inclined portion 183a inclines downward Z2 toward the left side Y1. The lid right-side inclined portion 183b inclines downward Z2 toward the right side Y2.

[0064] The lid ridge portion 185 is the upper end of the lid left and right inclined portions 183. When viewed from the front-rear direction X, the lid ridge portion 185 is the portion where the lid left inclined portion 183a and the lid right inclined portion 183b intersect. As shown in FIG. 3, the lid ridge portion 185 is disposed so as to extend in the front-rear direction X. In the example shown in FIG. 4, when viewed from the left-right direction Y, the lid ridge portion 185 extends linearly in the front-rear direction X (has a flat shape). The lid ridge portion 185 may have a convex portion 286 (see FIG. 7) (described later).

[0065] (Continuity between the mixing chamber bottom 30 and the lid upper part 80u) The following describes the case where the lid 80 is in the closed state (the state in which the mixing chamber discharge port 20 is closed). The lid outer peripheral upper end 181t is arranged so as to be continuous in the vertical direction Z with the mixing chamber discharge port inner peripheral upper end 121t. This "continuous in the vertical direction Z" means that the positions (heights) in the vertical direction Z are continuous. The height of the lid outer peripheral upper end 181t is the same (or approximately the same) as the height of the mixing chamber discharge port inner peripheral upper end 121t. There is no or almost no step in the vertical direction Z (step portion S shown in FIG. 5) at the joint (boundary) between the lid upper portion 80u and the mixing chamber bottom 30. As shown in FIG. 4, the end of the lid ridge portion 185 in the front-rear direction X (a part of the lid outer peripheral upper end 181t) is continuous with the end of the material discharge slope portion 137 on the mixing chamber discharge port 20 side (a part of the mixing chamber discharge port inner peripheral upper end 121t). The portion of the lid outer peripheral upper end 181t shown in FIG. 3 that is continuous with the mixing chamber outlet inner peripheral upper end 121t in the vertical direction Z is preferably the entire periphery of the lid outer peripheral upper end 181t.

[0066] Here, as shown in FIG. 5, if there is a step S at the joint between the lid upper portion 80u and the mixing chamber bottom portion 30, the flow of the material may be hindered around the step S when the material is mixed, and the material may stagnate around the step S. This may result in a decrease in the material mixing performance (productivity) of the mixer 1. On the other hand, as shown in FIG. 4, if there is no (or almost no) step S (see FIG. 5), the material is prevented from stagnation around the step S when the material is mixed. This prevents a decrease in the material mixing performance (productivity) of the mixer 1.

[0067] 4, the seam between the lid upper portion 80u and the mixing chamber bottom portion 30 is arranged to form a broken line when viewed from the left-right direction Y. Specifically, the lid ridge portion 185 and the bottom ridge portion 135 are arranged to form a broken line when viewed from the left-right direction Y. Furthermore, the seam between the lid upper portion 80u and the mixing chamber bottom portion 30 may also be arranged to form a broken line in a cross section viewed from the left-right direction Y and at a position shifted in the left-right direction Y from the bottom ridge portion 135 (not shown).

[0068] Note that lid outer peripheral upper end 181t may be arranged to smoothly connect to mixing chamber outlet inner peripheral upper end 121t in the up-down direction Z. Specifically, when viewed from the left-right direction Y, lid ridge portion 185 and bottom ridge portion 135 may be arranged to be connected in a straight line or a smooth curve rather than a broken line. Also, in a cross section viewed from the left-right direction Y at a position shifted in the left-right direction Y from bottom ridge portion 135, the seam between lid upper portion 80u and mixing chamber bottom portion 30 may be arranged to be connected in a straight line or a smooth curve rather than a broken line.

[0069] (Variation 1) It is preferable that there is no (or almost no) step S shown in FIG. 5 at the joint between the lid upper part 80u and the mixing chamber bottom part 30, but the step S may be present.

[0070] (Variation 2) The lid upper portion 80u of Modification 2 will be described with reference to Figures 6 and 7. As shown in Figure 7, the lid upper portion 80u includes a lid upper end portion 280t and a convex portion 286.

[0071] The lid upper end 280t is the upper end of the lid 80, and is the upper end of the lid upper part 80u. The lid upper end 280t is the uppermost part Z1 of the lid upper part 80u.

[0072] When the lid 80 is closed, the lid upper end 280t is positioned on the upper side Z1 of the upper end of the mixing chamber outlet 20 (referred to as the mixing chamber outlet upper end 220t). Therefore, compared to when the height of the lid upper end 280t is equal to or less than the height of the mixing chamber outlet upper end 220t (see FIG. 4), the gap (clearance) between the lid upper portion 80u and the rotor 40 (see FIG. 1) can be reduced during mixing of the materials, allowing for increased energy input to the materials. Specifically, during mixing of the materials, the materials pass through the gap between the inner surface of the chamber 5 and the rotor 40, as shown in FIG. 1, and the gap between the lid upper portion 80u and the rotor 40. This applies energy (e.g., energy due to shear force) to the materials, improving the material mixing performance of the mixer 1. On the other hand, as shown in FIG. 4, when the mixing chamber bottom 30 has the material discharge inclined portion 137, the gap between the rotor 40 (see FIG. 1) and the lid upper portion 80u may be larger than when the material discharge inclined portion 137 is not present (when the mixing chamber bottom 30 is flat when viewed from the left-right direction Y). As a result, the energy (input energy) applied to the material decreases, and the material mixing performance of the mixer 1 deteriorates. Therefore, in the example shown in FIG. 7, the lid upper end 280t is positioned on the upper side Z1 of the mixing chamber outlet upper end 220t. Therefore, compared to when the height of the lid upper end 280t is equal to or less than the height of the mixing chamber outlet upper end 220t (see FIG. 4), the gap between the lid upper portion 80u and the rotor 40 (see FIG. 1) during material mixing is smaller. Therefore, the energy applied to the material increases, and the material mixing performance of the mixer 1 can be improved.

[0073] The lid upper end 280t is preferably positioned further upward on the Z1 side. The closer the lid upper end 280t is positioned on the Z1 side, the smaller the gap between the lid upper portion 80u and the rotor 40 (see FIG. 1). The height of the lid upper end 280t is preferably the same as the height of the upper end of the material discharge inclined portion 137 (material discharge inclined portion upper end 137t).

[0074] The convex portion 286 is a portion that is convex toward the upper side Z1 when viewed from the left-right direction Y. Specifically, the central portion in the front-rear direction X of the lid upper portion 80u having the convex portion 286 protrudes toward the upper side Z1 more than the outer portions of the lid upper portion 80u in the front-rear direction X. For example, the lid ridge portion 185 has a curved shape that is convex toward the upper side Z1 when viewed from the left-right direction Y. This lid ridge portion 185 is the convex portion 286. Furthermore, in a cross section viewed from the left-right direction Y, at a position shifted in the left-right direction Y from the lid ridge portion 185, the upper end portion of the lid upper portion 80u may have a curved shape that is convex toward the upper side Z1. The lid upper portion 80u in this cross section may be included in the convex portion 286.

[0075] In the example shown in Fig. 7, the convex portion 286 has a pointed convex shape. Specifically, when viewed from the left-right direction Y, the upper end portion (lid ridge portion 185) of the convex portion 286 is a broken line shape with one corner (a roughly upside-down V shape). When viewed from the left-right direction Y, the upper end portion of the convex portion 286 may be a broken line shape with two or more corners, or may be a smooth curve. The convex portion 286 includes a lid front-rear inclined portion 287.

[0076] The lid front-rear inclined portion 287 is a portion that is inclined with respect to the front-rear direction X when viewed from the left-right direction Y. When viewed from the left-right direction Y, the lid front-rear inclined portion 287 is inclined (vertically upward) from an outer portion of the lid upper portion 80u in the front-rear direction X toward an inner portion (e.g., a central portion) of the lid upper portion 80u in the front-rear direction X toward the upper side Z1. When viewed from the left-right direction Y, the lid front-rear inclined portion 287 is inclined with respect to the front-rear direction X so that the inner portion is positioned closer to the upper side Z1. The lid front-rear inclined portion 287 is positioned on both sides of the lid upper portion 80u in the front-rear direction X. The lid front-rear inclined portion 287 includes a lid front inclined portion 287a and a lid rear inclined portion 287b. The lid front inclined portion 287a is positioned closer to the front side X1 than the lid upper end portion 280t. When viewed from the left-right direction Y, the lid front inclined portion 287a is inclined upward toward the rear side X2. The lid rear inclined portion 287b is disposed on the rear side X2 of the lid upper end portion 280t. When viewed from the left-right direction Y, the lid rear inclined portion 287b is inclined upward Z1 toward the front side X1.

[0077] As shown in Fig. 5, when the lid upper portion 80u does not have the convex portion 286 (see Fig. 7), the lid upper end portion 280t may be positioned on the upper side Z1 of the mixing chamber outlet upper end portion 220t. Even in this case, the gap between the lid upper portion 80u and the rotor 40 (see Fig. 1) can be reduced when mixing the materials. However, in the example shown in Fig. 5, the materials may stagnate around the step portion S when mixing the materials.

[0078] (Effects of the first invention) The effects of the mixer 1 shown in FIG. 1 are as follows. The mixer 1 includes a mixing chamber 10 in which materials are mixed. The mixing chamber 10 includes a mixing chamber bottom 30 and a mixing chamber outlet 20. The mixing chamber bottom 30 is the lower Z2 portion of the mixing chamber 10. The mixing chamber outlet 20 is provided on the mixing chamber bottom 30 and allows materials to pass through. The direction in which the rotation axis of the rotor 40 arranged inside the mixing chamber 10 extends is defined as the front-rear direction X (rotor axial direction).

[0079] [Configuration 1] As shown in Fig. 4, mixing chamber bottom 30 has a material discharge slope 137. When viewed from the left-right direction Y (a direction perpendicular to both the rotor axial direction and the vertical direction), material discharge slope 137 slopes downward Z2 (downward) from the outer portion of mixing chamber bottom 30 in the front-rear direction X toward mixing chamber discharge port 20.

[0080] With the above-described [Configuration 1], when the material is discharged from the mixing chamber 10, the material is likely to move by gravity from a position on the mixing chamber bottom 30 that is shifted in the front-rear direction X from the mixing chamber discharge port 20 (a position that includes an outer portion of the mixing chamber bottom 30 in the front-rear direction X) toward the mixing chamber discharge port 20. Therefore, the mixing device 1 can prevent the material from remaining on the mixing chamber bottom 30 at a position that is shifted in the front-rear direction X from the mixing chamber discharge port 20. Therefore, the mixing device 1 can prevent the material from remaining on the mixing chamber bottom 30 when the material is discharged from the mixing chamber 10.

[0081] (Effects of the second invention) 1, the mixing device 1 includes a rotor 40 and a lid 80. The rotor 40 is disposed inside the mixing chamber 10 and mixes the materials. The lid 80 opens and closes the mixing chamber outlet 20.

[0082] [Configuration 2] As shown in FIG. 7, when the lid 80 is in a state in which it closes the mixing chamber outlet 20 (closed state), the upper end of the lid 80 (lid upper end 280t) is positioned on the upper side Z1 of the upper end of the mixing chamber outlet 20 (mixing chamber outlet upper end 220t).

[0083] The above [Configuration 2] can reduce the gap between the lid 80 and the rotor 40 (see FIG. 1) when mixing materials in the mixing chamber 10. This can increase the energy (input energy) applied to materials passing through the gap between the lid 80 and the rotor 40. As a result, the material mixing performance of the mixer 1 can be improved.

[0084] (Effect of the third invention) [Configuration 3] When the lid 80 closes the mixing chamber discharge outlet 20 (closed state), the upper end of the lid 80 (lid upper end 280t) is positioned at the same height as the upper end of the material discharge inclined portion 137 (material discharge inclined portion upper end 137t).

[0085] The above [Configuration 3] can further reduce the gap between the lid 80 and the rotor 40 (see FIG. 1) when mixing materials in the mixing chamber 10. This can further increase the energy (input energy) applied to materials passing through the gap between the lid 80 and the rotor 40. As a result, the material mixing performance of the mixer 1 can be further improved.

[0086] (Effect of the fourth invention) [Configuration 4] When the lid 80 is in a state in which it closes the mixing chamber outlet 20 (closed state), the upper end of the outer periphery of the lid 80 (upper end 181t of the lid outer periphery) is arranged so as to be continuous in the vertical direction Z with the upper end of the inner periphery of the mixing chamber outlet 20 (upper end 121t of the mixing chamber outlet inner periphery).

[0087] The above [Configuration 4] can prevent the problem of the material accumulating around the step in the vertical direction Z at the joint between the lid 80 and the mixing chamber bottom 30 (see step S in FIG. 5) when the material is mixed in the mixing chamber 10. This prevents the flow of the material from being obstructed when the material is mixed in the mixing chamber 10. As a result, the material mixing performance of the mixer 1 can be improved.

[0088] (Effect of the fifth invention) [Configuration 5] The mixing chamber 10 is a section where materials are mixed in the presence of a working fluid in a supercritical or subcritical state.

[0089] The above-mentioned [Configuration 5] achieves the following effects. When materials are mixed in the presence of a working fluid in a supercritical or subcritical state, the mixing chamber 10 must be maintained at a high pressure to maintain the working fluid in a supercritical or subcritical state. Therefore, it is important to seal the mixing chamber 10 (to increase airtightness). Therefore, as shown in FIG. 3, it is conceivable to make the mixing chamber outlet 20 smaller relative to the mixing chamber bottom 30. However, if the mixing chamber outlet 20 is made smaller relative to the mixing chamber bottom 30, there is a possibility that materials will remain on the mixing chamber bottom 30 at a position offset in the forward / backward direction X from the mixing chamber outlet 20. Therefore, as shown in FIG. 4, the mixing device 1 is provided with a material discharge inclined portion 137 (the above-mentioned [Configuration 1]). This makes it possible to prevent materials from remaining on the mixing chamber bottom 30 at a position offset in the forward / backward direction X from the mixing chamber outlet 20. Therefore, even when materials are mixed in the presence of a working fluid in a supercritical or subcritical state (above [Configuration 5]), the airtightness of the mixing chamber 10 can be increased when the materials are mixed, and the materials can be prevented from remaining at the bottom 30 of the mixing chamber when the materials are discharged.

[0090] (Other variations) The above-described embodiments and modified examples may be modified in various ways. For example, the components of the above-described embodiments and modified examples may be combined in various ways, the number of components may be changed, or some of the components may not be provided. For example, the arrangement of the components may be changed. For example, the inclusion relationships of the components may be changed in various ways. For example, a component described as a lower-level component included in a higher-level component may not be included in this higher-level component, but may be included in another component. For example, what is described as multiple different elements may be combined into a single element. For example, what is described as a single element may be provided as multiple different elements. For example, each component may have only a portion of its respective features (function, arrangement, shape, operation, etc.). [Explanation of symbols]

[0091] 1 Mixing device 10 Mixing chamber 20 Mixing chamber outlet 30 Bottom of mixing chamber 40 rotors 80 Lid 121t Upper end of inner periphery of mixing chamber outlet (Upper end of inner periphery of mixing chamber outlet) 137 Material discharge slope 181t Upper end of outer periphery of lid (Upper end of outer periphery of lid) 220t Upper end of mixing chamber outlet (Upper end of mixing chamber outlet) 280t Top of lid (top of lid) X Front-rear direction (rotor axial direction) Z vertical direction

Claims

1. a mixing chamber in which the materials are mixed; The mixing chamber comprises: a mixing chamber bottom, which is a lower portion of the mixing chamber; a mixing chamber outlet provided at the bottom of the mixing chamber and through which the material can pass; Equipped with When the direction in which the rotation axis of the rotor disposed inside the mixing chamber extends is defined as the rotor axial direction, the mixing chamber bottom includes a material discharge inclined portion that slopes downward from an outer portion of the mixing chamber bottom in the rotor axial direction toward the mixing chamber discharge port when viewed from directions perpendicular to both the rotor axial direction and the vertical direction. Mixing equipment.

2. 2. The mixing device of claim 1, a rotor disposed within the mixing chamber for mixing the materials; a lid for opening and closing the mixing chamber outlet; Equipped with When the lid closes the mixing chamber outlet, an upper end of the lid is positioned higher than an upper end of the mixing chamber outlet. Mixing equipment.

3. 3. The mixing device of claim 2, When the lid closes the mixing chamber discharge port, the upper end of the lid is positioned at the same height as the upper end of the material discharge inclined portion. Mixing equipment.

4. 2. The mixing device of claim 1, When the lid closes the mixing chamber outlet, an upper end of an outer periphery of the lid is arranged so as to be continuous in the up-down direction with an upper end of an inner periphery of the mixing chamber outlet. Mixing equipment.

5. 2. The mixing device of claim 1, The mixing chamber is a portion where the materials are mixed in the presence of a working fluid in a supercritical state or a subcritical state. Mixing equipment.

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