Stirring device

Abstract

To provide a stirring device capable of efficiently charging powder into a stirring container by controlling internal pressure in a pipe for connecting the stirring container to a container for storing the powder different from the stirring container.SOLUTION: A stirring device includes: a stirring container containing liquid; a powder container containing powder; a piping for connecting a bottom portion of the stirring container and the powder container and capable of transferring the powder contained in the powder container into the stirring container; decompression means for decompressing the inside of the stirring container and the inside of the piping; and pressure regulation means connected to the piping and capable of controlling the pressure inside the piping.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an agitator having a function of dissolving powder in a liquid. [Background technology]

[0002] 2. Description of the Related Art Agitation devices capable of dissolving powder in liquid are widely used, particularly in the fields of cosmetics and food. Conventionally, agitation devices with the function of dissolving powder in liquid have employed a method in which, for example, powder is poured into a stirring vessel from above the liquid and allowed to fall toward the liquid surface, and the liquid is stirred with a stirring blade, causing the powder that has fallen to the liquid surface to dissolve in the liquid. However, with this method, the powder can scatter above the liquid surface in the stirring vessel, soiling the inner wall surface of the stirring vessel, etc., resulting in a problem of significantly reducing the maintainability of the stirring device. Furthermore, when a powder with a low specific gravity is used as the powder to be dissolved in the liquid, there is a problem in that the powder that falls onto the liquid surface accumulates on the liquid surface, inhibiting dissolution into the liquid.

[0003] As a means for solving this problem, for example, a stirring device as shown in Patent Document 1 has been proposed. The agitation device shown in Patent Document 1 employs a method in which the pressure inside a sealed tank containing liquid is reduced, and powder contained in a container separate from the agitation container is sucked into the agitation container through a connecting pipe from the bottom side of the agitation container under negative pressure, and then dissolved in the liquid stored in the agitation container. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-42376

[0005] In a method such as the stirring device shown in Patent Document 1, where powder is sucked into the stirring vessel from the bottom side using negative pressure and dissolved in the liquid stored in the stirring vessel, the powder is sent directly into the liquid in the stirring vessel without passing through the atmosphere inside the stirring vessel, so there is no problem of the powder scattering above the liquid surface in the stirring vessel and soiling the inner wall surface of the stirring vessel, which significantly reduces the maintainability of the stirring device, and there is also no problem of powder that falls to the liquid surface accumulating on the liquid surface and inhibiting dissolution into the liquid. Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the agitation device shown in Patent Document 1, when powder is introduced into the agitation vessel by negative pressure suction from the bottom side of the agitation vessel, the internal pressure in the piping connecting the agitation vessel to another vessel temporarily drops immediately after the valve is opened, reducing the pressure difference between the agitation vessel and the piping.As a result, the liquid contained in the agitation vessel flows into the piping and comes into contact with the powder, causing a problem of clogging the piping.

[0007] In order to solve this problem, the inventors of the present invention conducted extensive research and discovered that the above problem can be solved by controlling the internal pressure in the pipe connecting the stirring vessel to a container that contains a powder other than the stirring vessel. [Means for solving the problem]

[0008] Specifically, the agitation device of the present invention comprises an agitation vessel for accommodating a liquid, a powder vessel for accommodating a powder, a pipe connecting the bottom of the agitation vessel to the powder vessel and capable of transferring the powder accommodated in the powder vessel into the agitation vessel, and a pressure reducing means for reducing the pressure inside the agitation vessel and the pipe, and while reducing the pressure inside the agitation vessel, the powder accommodated in the powder vessel is taken into the agitation vessel by negative pressure suction from the bottom side of the agitation vessel via the pipe and dissolved in the liquid stored in the agitation vessel, and further comprises a pressure adjusting means connected to the pipe and capable of controlling the pressure inside the pipe, and the pressure adjusting means comprises an introduction path connected to the pipe and a pressure adjusting valve disposed in the introduction path, By controlling the pressure inside the pipe, the liquid contained in the stirring vessel is prevented from flowing into the pipe and coming into contact with the powder, thereby preventing clogging of the pipe, The pressure inside the pipe of The control is performed by controlling the amount and speed of introducing air or gas into the piping by controlling the opening and closing amount of the pressure regulating valve, Introduction route is an R portion where the extension direction of the linearly extending pipe changes curvedly, before In the R portion, the extension direction is connected to the pipe on the outer circumferential side of the central cross section of the pipe perpendicular to a plane including the direction in which the curved change occurs, and the bending R angle of the R portion is α1 [°], In the plane including the direction in which the stretching direction changes curvedly, a straight line connecting the center of curvature of the bending R angle of the R portion and the downstream end of the R portion; Introduction route When the angle between the center line and the Introduction route is connected at a position in the R portion where 0<α2≦0.5×α1 (0<α1<90) (Claim 1).

[0010] More preferably, Introduction route is connected to the pipe at a portion where the extending direction of the pipe extending linearly changes by 10° to 80° (claim 2).

[0011] More preferably, Introduction route In the R portion, the central cross section of the pipe parallel to the plane including the direction in which the extension direction changes curvedly and the the outer periphery of the central cross sectionAn intersection line between the surface and the central cross section of the pipe, which is perpendicular to a plane including the direction in which the extension direction changes curvedly, and an intersection line between the surface and the central cross section of the pipe. Either The area of ​​the surface of the pipe defined by and a position where the center line of the introduction path does not overlap with the intersection line of the former. (Claim 3). [Effects of the Invention]

[0012] Generally, in a stirring device of this type, the pressure inside a sealed tank storing liquid is reduced, and powder stored in a container other than the stirring vessel is taken into the stirring vessel by negative pressure suction from the bottom side of the stirring vessel via a pipe connecting the stirring vessel to the other container, and then dissolved in the liquid stored in the stirring vessel. Because the powder is sent directly into the liquid in the stirring vessel without passing through the atmosphere inside the container, there is no problem that the powder scatters above the liquid surface in the stirring vessel and soils the inner wall surface of the stirring vessel, which significantly reduces the maintainability of the stirring vessel, and there is also no problem that the powder that falls onto the liquid surface accumulates on the liquid surface and inhibits dissolution into the liquid. However, there is a problem that when starting to take in the powder into the stirring vessel by negative pressure suction from the bottom side of the stirring vessel, the internal pressure in the pipe connecting the stirring vessel to the other container temporarily drops immediately after the valve is opened, which causes the powder to be soiled by the stirring vessel. and distribution The differential pressure between the pipe and the container decreases, and as a result, the liquid contained in the mixing vessel flows into the pipe and comes into contact with the powder, causing a problem of clogging the pipe.

[0013] In contrast, as in the present invention, if there is a stirring vessel containing a liquid, a powder container containing a powder, a pipe connecting the bottom of the stirring vessel to the powder container and capable of transferring the powder contained in the powder container into the stirring vessel, a pressure reducing means for reducing the pressure inside the stirring vessel and the pipe, and a pressure adjusting means connected to the pipe and capable of controlling the pressure inside the pipe, when powder is started to be taken into the stirring vessel by negative pressure suction from the bottom side of the stirring vessel, the internal pressure in the pipe connecting the stirring vessel to another container temporarily decreases immediately after the valve is opened, reducing the pressure difference between the stirring vessel and the pipe, and as a result, the liquid contained in the stirring vessel flows into the pipe and comes into contact with the powder, thereby preventing the occurrence of problems such as clogging the pipe.

[0014] Here, if a means for introducing air or gas into the piping is used as the pressure regulating means, there is no need to employ a complex mechanism, and the pressure inside the piping can be controlled relatively easily without damaging the properties of the powder.

[0015] Furthermore, if a means for controlling the amount of air or gas introduced into the pipe by opening and closing a pressure adjusting valve is employed as the pressure adjusting means, it becomes easier to control the pressure inside the pipe.

[0016] Here, if the position where the pressure adjustment means is connected is on the surface of the pipe where the extension direction of the pipe capable of transporting powder into the agitator vessel changes by 10° to 80°, it is possible to reliably achieve the effect of controlling the pressure inside the pipe and preventing the occurrence of problems such as the liquid contained in the agitator vessel flowing into the pipe and coming into contact with the powder. Furthermore, if the portion where the extension direction of the pipe changes is an R portion where the extension direction changes in a curved manner, the above-mentioned effect can be more reliably achieved.

[0017] Furthermore, if the pressure regulating means is connected to the pipe on the outer periphery of the central cross section of the pipe that is perpendicular to the plane containing the direction in which the extension direction changes curvedly in the R portion, it is possible to reliably achieve the effect of controlling the pressure inside the pipe without hindering the flow of powder from the powder container to the agitator container, thereby suppressing the occurrence of the problem of the liquid contained in the agitator container flowing into the pipe and coming into contact with the powder.

[0018] Furthermore, when the pressure regulating means is connected to a region of the surface of the pipe in the R portion that is defined by the intersection line between the central cross section of the pipe that is parallel to the plane containing the direction in which the extension direction changes curvedly and the surface of the pipe, and the intersection line between the central cross section of the pipe that is perpendicular to the plane containing the direction in which the extension direction changes curvedly and the surface of the pipe, the effect of suppressing the obstruction of the flow of powder from the powder container to the agitating container is particularly enhanced, and it is possible to reliably achieve the effect of controlling the pressure inside the pipe and suppressing the occurrence of problems such as the liquid contained in the agitating container flowing into the pipe and coming into contact with the powder.

[0019] Furthermore, when the bending R angle of the R portion is α1 and the angle between the line connecting the center of curvature of the bending R angle of the R portion and the downstream end of the R portion and the center line of the pressure adjustment means is α2, if the pressure adjustment means is connected at a position in the R portion where 0<α2≦0.5×α1 (0<α1<90), the effect of suppressing the obstruction of the flow of powder from the powder container to the agitating container is particularly enhanced, and the accuracy of control of the pressure inside the piping can be improved, making it possible to further enhance the effect of suppressing the occurrence of the problem of the liquid contained in the agitating container flowing into the piping and coming into contact with the powder.

[0020] Other features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a structural diagram showing a stirring device according to the present invention. [Figure 2]FIG. 3 is a front view showing a pressure adjusting means according to the present invention. [Figure 3] FIG. 4 is a side view showing a pressure adjusting means according to the present invention. [Figure 4] FIG. 3 is a plan view showing a pressure adjusting means according to the present invention. [Figure 5] FIG. 2 is a perspective view showing a pressure adjusting means according to the present invention. [Figure 6] 5 is a schematic diagram showing a pressure adjusting means according to the present invention and a comparative example. FIG. [Figure 7] FIG. 4 is a plan view showing a pressure adjusting unit according to the present invention and a comparative example. [Figure 8] 5 is a schematic diagram showing a pressure adjusting means according to the present invention and a comparative example. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0022] Preferred embodiments of the present invention will now be described in detail with reference to the drawings. To facilitate understanding, the scale of each part in the drawings may differ from the actual scale. Directions such as parallel, right-angled, orthogonal, horizontal, vertical, up-down, left-right, and the like are permitted to deviate to the extent that the effects of the embodiments are not impaired. The shape of the corners is not limited to right angles, and may be rounded in an arched shape. Parallel, right-angled, orthogonal, horizontal, and vertical may include approximately parallel, approximately right-angled, approximately orthogonal, approximately horizontal, and approximately vertical.

[0023] As shown in FIG. 1, the stirring device 1 includes a cylindrical container 2 and an outer layer (jacket) 4 to which piping 3 is connected to the outer peripheral surface, including the bottom surface, of the container 2 for supplying and discharging cooling water or hot water. The stirring device 1 also includes a first stirring unit 5, a second stirring unit 6, and a third stirring unit .

[0024] The container 2 has a capacity capable of holding, for example, 50 liters of liquid. The container 2 is capable of keeping the liquid contained in the container 2 warm or cool by means of a jacket 4 provided on the outer periphery or the like. Furthermore, a liquid injection path 8 is connected to the container 2, and the liquid contained in the container 2 is injected into the container 2 via the liquid injection path 8. Furthermore, a discharge path 9 is connected to the container 2, and the treatment liquid that has been treated in the container 2 is discharged to the outside of the container 2 via the discharge path 9.

[0025] The first stirring unit 5 has a function of slowly stirring the treatment liquid in the container 2 throughout the container 2 . The first stirring unit 5 is, for example, an anchor mixer. The first stirring unit 5 includes a stirring blade, and the stirring blade is connected to a motor via a shaft to rotate the stirring blade. The stirring blades of the first stirring unit 5 have a shape that fits the bottom and sides of the container 2, and are rotated by a motor to slowly stir the treatment liquid in the container 2 throughout the container 2.

[0026] The second stirring unit 6 has a function of stirring the treatment liquid in the container 2 at high speed. The second stirring section 6 is, for example, a high-speed dispersing machine such as a homomixer or a disper mixer. The second stirring unit 6 includes a stirring blade, and the stirring blade is connected to a motor via a shaft to rotate the stirring blade. The stirring blades of the second stirring unit 6 are rotated at high speed by a motor, stirring the treatment liquid in the container 2 at high speed, for example, to promote emulsification of the treatment liquid.

[0027] The third stirring unit 7 has a function of stirring the treatment liquid in the container 2 at a medium speed. The third stirring section 7 is, for example, a medium speed dispersing machine such as a Disper. The third stirring unit 7 includes a stirring blade, which is connected to a motor via a shaft to rotate the stirring blade. The stirring blades of the third stirring unit 7 are rotated at high speed by a motor, and stir the treatment liquid in the container 2 at medium speed, for example, to promote dispersion of the treatment liquid. In this embodiment, an example in which the third stirring unit 7 includes two stirring blades is shown, but the number is not limited to this and can be increased or decreased depending on the properties of the object to be treated, etc.

[0028] In this embodiment, an example is shown in which the first stirring unit 5, the second stirring unit 6, and the third stirring unit 7 are provided, but this is not limited to this, and it is also possible to use only one of the stirring units or a combination of any two of the stirring units depending on the properties of the object to be treated, etc.

[0029] The container 2 has a sealed structure. Further, the container 2 is connected to a pressure reducing means 10 for reducing the pressure inside the container. The pressure reducing means 10 includes a vacuum pump, and the atmosphere inside the container 2 can be evacuated to the outside of the container 2 by the vacuum pump.

[0030] The agitator 1 includes a container 2 and a powder container 11 . The powder container 11 is a tank for storing powder to be poured into the container 2, and is a so-called hopper with a conical bottom. A pipe 12 for transferring powder to the container 2 is connected to the bottom of the powder container 11 , while the other end of the pipe 12 is connected to the bottom of the container 2 . The powder contained in the powder container 11 is transferred through the piping 12 and introduced into the container 2 by the pressure difference between the container 2 and the powder container 11 that occurs when the container 2 is depressurized. A valve is arranged in the pipe 12, and by controlling the opening and closing amount of the valve, the amount and speed of the powder introduced into the container can be controlled.

[0031] Because the agitator 1 is equipped with the powder supply mechanism described above, the powder is introduced directly into the treatment liquid contained in the container 2 without passing through the atmosphere inside the container 2, so there is no problem of the powder scattering above the liquid surface inside the agitator container 2 and soiling the inner wall surface of the agitator container 2, which significantly reduces the maintainability of the agitator 1, and there is also no problem of the powder falling onto the surface of the treatment liquid accumulating on the liquid surface and inhibiting its dissolution into the treatment liquid.

[0032] Furthermore, in the agitator 1, a pressure adjusting means 13 capable of controlling the pressure inside the pipe 12 is connected to the pipe 12. The pressure adjusting means 13 is capable of controlling the pressure inside the pipe 12 by introducing atmosphere or gas into the pipe 12, and the introduction of atmosphere or gas into the pipe 12 is performed via an introduction path 14 connected to the pipe 12. A valve is disposed in the introduction path 14, and the amount and speed of the air or the like introduced into the pipe 12 can be controlled by controlling the opening and closing amount of the valve. In this embodiment, an example has been shown in which the other end of the introduction path 14 is open and air is introduced into the pipe 12, but this is not limited to this. For example, the other end of the introduction path 14 can be connected to a cylinder of an inert gas such as nitrogen or a rare gas, and these gases can be introduced into the pipe 12 to control the pressure inside the pipe 12.

[0033] As shown in Figures 2 to 5, the joint between pipe 12 and introduction path 14 that constitutes pressure adjustment means 13 is provided on the surface of pipe 12, which extends linearly, at a portion where the extension direction of said pipe changes. Generally, powder is transported within pipe 12 in a state in which the powder is spread evenly throughout pipe 12, as shown in Figure 6(a). However, if the joint between pipe 12 and introduction path 14 is located at a point where the extension direction of extending pipe 12 changes as described above, air or gas can be introduced into pipe 12 from introduction path 14 in a state in which the powder being transported within pipe 12 is transported so that it is distributed ubiquitously on one side of pipe 12, as shown in Figure 6(b). This makes it easy to control the amount and speed of air, etc. introduced into pipe 12.

[0034] Here, as shown in Figures 2 to 5, if the portion where the extension direction of the linearly extending pipe 12 changes is an R portion where the extension direction changes in a curved manner, it becomes easier to maintain a state in which the powder transported within the pipe 12 is transported so that it is omnipresent on one side of the pipe 12, and it becomes even easier to control the amount and speed of air, etc. introduced into the pipe 12.

[0035] In the R portion where the stretching direction changes in a curved shape, the angle α1 formed by both ends of the R portion as defined in FIG. 2 is preferably set in the range of 10° to 80°. If α1 is less than 10°, it becomes difficult to maintain a state in which the powder is transported so that it is omnipresent on one side of the pipe 12, while if α1 is more than 80°, the transport of the powder itself within the pipe 12 will be hindered. It is preferable that α1 is set in the range of 20° to 70°, more preferably, α1 is set in the range of 30° to 60°, and even more preferably, α1 is set in the range of 40° to 50°.

[0036] Furthermore, pressure adjusting means 13 is preferably provided on the surface of pipe 12 on the outer periphery side of the central cross section of pipe 12 perpendicular to the plane including the direction in which the extension direction curves in the R portion. When the pressure regulating means 13 is provided at this position in this manner, it is possible to control the amount and speed of powder being transferred within the pipe 12 by the action of the pressure regulating means 13, while maintaining the effect of easily controlling the amount and speed of air, etc. being introduced into the pipe 12.

[0037] Here, the central cross section of the pipe 12 that is perpendicular to the plane containing the direction in which the extension direction changes curvedly is the cross section represented by the dotted line AA in Figures 2 and 4, and the pressure adjustment means 13 is connected to the surface of the pipe 12 on the outer periphery side of the central cross section (to the right of the dotted line AA in Figures 2 and 4).

[0038] In addition, it is preferable that the pressure adjustment means 13 is provided in the R portion in a region of the surface of the pipe 12 that is defined by the intersection line between the central cross section of the pipe 12 and the surface of the pipe 12, which is parallel to a plane including the direction in which the extension direction changes curvedly, and the intersection line between the central cross section of the pipe 12 and the surface of the pipe 12, which is perpendicular to the plane including the direction in which the extension direction changes curvedly. When the pressure regulating means 13 is provided at this position, it is possible to more accurately control the amount and speed of the powder being transported within the pipe 12 through the action of the pressure regulating means 13, while maintaining the effect of easily controlling the amount and speed of the air, etc. being introduced into the pipe 12.

[0039] Here, the central cross section of the pipe 12 that is parallel to the plane including the direction in which the extension direction changes curvedly is the cross section represented by the dotted line BB in Figures 3 and 4, and the pressure adjustment means 13 is connected to a region on the surface of the pipe 12 (the region indicated by arrow S in Figure 4) that is defined by the intersection line between the central cross section and the surface of the pipe 12 and the intersection line between the central cross section of the pipe 12 (dotted line AA in Figures 2 and 4) that is perpendicular to the plane including the direction in which the extension direction changes curvedly and the surface of the pipe 12. Note that being provided in the area indicated by the arrow S in Figure 4 here means that at least the center of the pressure adjustment means 13 is provided in that area, and the outer periphery of the pressure adjustment means 13 may be provided outside that area.

[0040] By providing the pressure regulating means 13 in this position, it is possible to more accurately control the amount and speed of the powder being transported within the pipe 12, while maintaining the effect of easily controlling the amount and speed of the air, etc. being introduced into the pipe 12, through the action of the pressure regulating means 13.

[0041] Here, as shown in FIG. 7, when the pressure adjusting means 13 is provided in the region indicated by the arrow S in FIG. 4 (FIG. 7(a)), and when the pressure adjusting means 13 is provided so that its center is positioned on the central cross section of the pipe 12 (dotted line AA in FIGS. 2 and 4) perpendicular to the plane including the direction in which the extension direction changes curvedly (FIG. 7(b)), as shown in FIG. 8, in the former case (FIG. 8(a)), air or gas F can be introduced into the pipe 12 from the introduction path 14 so as to contact the side of the powder P being transported so as to be ubiquitous on one side within the pipe 12, whereas in the latter case (FIG. 8(b)), air or gas F is introduced into the pipe 12 from the introduction path 14 toward the center of the powder P being transported so as to be ubiquitous on one side within the pipe 12. Therefore, in the former case (Figure 8(a)), the effect of easily controlling the amount and speed of air, etc. introduced into the pipe 12 is maintained compared to the former case (Figure 8(b)), while the action of the pressure adjustment means 13 makes it possible to more accurately control the amount and speed of powder transport within the pipe 12.

[0042] Furthermore, as shown in FIG. 2, when the bending R angle of the R portion (the angle formed by both ends of the R portion) is α1, and the angle formed by the line connecting the center of curvature of the bending R angle of the R portion and the downstream end of the R portion and the center line of the pressure adjusting means 13 is α2, it is preferable that the pressure adjusting means 13 is provided at a position in the R portion where 0<α2≦0.5×α1 (0<α1<90) holds. Here, when the pressure regulating means 13 is cylindrical, as in the present embodiment, the center line of the pressure regulating means 13 is defined as the center line in its extension direction, but this is not limited to this. For example, when the pressure regulating means 13 is a rectangular tube with a polygonal cross section, the center line of the pressure regulating means 13 can be a straight line passing through the center of the cross section of two or more cross sections in the extension direction of the pressure regulating means 13. When the pressure regulating means 13 is connected to this position in this manner, the effect of easily controlling the amount and speed of air, etc. introduced into the piping 12 is maintained, while the action of the pressure regulating means 13 makes it possible to control the amount and speed of powder transport within the piping 12 with even greater precision.

[0043] The stirring device according to the present invention is not limited to the above-described embodiment, and the specific configuration of each part of the stirring device according to the present invention can be freely designed and modified in various ways. [Explanation of symbols]

[0044] 1 Stirring device 2 containers 3 Piping 4 Outer layer 5 1st stirring section 6 Second stirring section 7 Third stirring section 8 Liquid injection route 9. Excretion Route 10 Pressure reduction means 11 Powder container 12 Piping 13 Pressure Regulating Means 14 Introduction route

Claims

1. a stirring vessel containing a liquid; a powder container for containing powder; a pipe that connects the bottom of the stirring vessel to the powder container and that is capable of transferring the powder contained in the powder container into the stirring vessel; a pressure reducing means for reducing the pressure inside the stirring vessel and inside the piping, While reducing the pressure in the stirring vessel, the powder contained in the powder container is sucked into the stirring vessel through the piping from the bottom side of the stirring vessel under negative pressure, and the powder is dissolved in the liquid stored in the stirring vessel, a pressure adjusting means connected to the piping and capable of controlling the pressure inside the piping; The pressure adjusting means is an introduction path connected to the piping; a pressure regulating valve disposed in the introduction path; By controlling the pressure inside the pipe, the liquid contained in the stirring vessel is prevented from flowing into the pipe and coming into contact with the powder, thereby preventing clogging of the pipe, The pressure inside the pipe is controlled by: The amount and speed of introducing air or gas into the piping are controlled by controlling the opening / closing amount of the pressure regulating valve, the introduction path is an R portion where the extension direction of the linearly extending pipe changes in a curved manner, and the introduction path is connected to the pipe on an outer circumferential side of a central cross section of the pipe that is perpendicular to a plane including the direction in which the extension direction changes in a curved manner in the R portion; The bending R angle of the R portion is α1 [°], In the plane including the direction in which the extension direction changes curvedly, when the angle formed by the straight line connecting the center of curvature of the bending R angle of the R portion and the downstream end of the R portion and the center line of the introduction path is α2 [°], The introduction path is, in the R portion, It is connected at a position where 0<α2≦0.5×α1 (0<α1<90) A stirring device characterized by:

2. 2. The agitation device according to claim 1, wherein the introduction path is connected to the pipe at a portion where the extending direction of the pipe that extends linearly changes by 10° to 80°.

3. The introduction path is, in the R portion, an intersection line between a central cross section of the pipe, which is parallel to a plane including a direction in which the extension direction changes curvedly, and a surface of the pipe on an outer circumferential side of the central cross section; An area on the surface of the pipe defined by either a central cross section of the pipe perpendicular to a plane including a direction in which the extension direction changes curvedly or a line of intersection with the surface of the pipe, and the center line of the introduction path is connected at a position that does not overlap with the former line of intersection.

2. The stirring device according to claim 1.

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