Agitating device, agitating method
By configuring multiple stirring blades along the height of the mixing tank, with the blade dimensions increasing or decreasing in the height direction, an effective circulating flow is formed, which solves the mixing performance problem in a long longitudinal mixing tank and achieves efficient stirring and uniform mixing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SUMITOMO HEAVY IND PROCESS EQUIP CO LTD
- Filing Date
- 2024-11-05
- Publication Date
- 2026-07-10
AI Technical Summary
Existing mixing devices require specially shaped mixing blades to effectively mix in longitudinally long mixing tanks, which increases costs and results in poor mixing performance.
Multiple stirring blades are arranged separately along the height of the mixing tank. The blade dimensions increase or decrease monotonically along the height direction, forming an effective circulating flow and avoiding the formation of flow partition walls.
It can effectively stir without the need for specially shaped stirring blades, improving stirring performance, reducing fluid retention and monomer polymer adhesion, and enhancing stirring uniformity and particle uniformity.
Smart Images
Figure CN122374076A_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to a stirring device, etc. Background Technology
[0002] Patent document 1 discloses a stirring device that generates a latex (also known as an emulsion or latex) by polymerizing monomers in a stirring tank and dispersing polymer particles in a medium such as water.
[0003] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 10-33966 Summary of the Invention
[0004] The technical problem to be solved by the invention To efficiently release the heat of reaction (hereinafter also referred to as the heat of polymerization) from the polymerization reaction outside the stirred tank, for example, stirred tanks with a ratio of the liquid level height L of the stirred fluid to the diameter D of the stirred tank that is significantly greater than 1 are mostly used. In order to effectively stir the stirred fluid in these longitudinally long stirred tanks, Patent Document 1 proposes the use of specially shaped stirring blades.
[0005] This disclosure was developed in view of these circumstances, and its purpose is to provide a stirring device or the like that can effectively stir the fluid in a stirring tank without the need for a specially shaped stirring blade.
[0006] means for solving technical problems To address the aforementioned problems, a stirring apparatus according to one aspect of the present invention includes a stirring blade that stirs a fluid contained in a stirring tank by rotation. The stirring blade has multiple wing portions arranged separately in the height direction of the stirring tank. Each wing portion has blades that generate a flow of the fluid being stirred, having a height component of the stirring tank, by rotation. The wing portion closer to the bottom of the stirring tank has a larger or smaller blade dimension in the height direction.
[0007] As detailed below, when the blades in a multi-stage vane configuration arranged separately along the height of the mixing tank have equal dimensions in the height direction, for example, the collision of flows from the upper and lower parts between two adjacent vanes in the height direction results in the formation of flow partitions, leading to a deterioration in the overall mixing performance of the mixing tank. In contrast, according to this method, the blades closer to the bottom of the mixing tank have larger or smaller dimensions in the height direction; in other words, the dimensions of the blades in the height direction monotonically increase or decrease along the height direction, thereby improving the overall mixing performance of the mixing tank.
[0008] Another aspect of the present invention is a stirring method. This method is a stirring method in a stirring apparatus equipped with stirring blades that stir a fluid contained in a stirring tank by rotation. The stirring blades have multiple wing portions arranged separately in the height direction of the stirring tank. Each wing portion has blades, and the blades have a larger or smaller height dimension closer to the bottom of the stirring tank. The rotation of each blade generates a flow of the stirred fluid with a height component of the stirring tank.
[0009] Furthermore, any combination of the above-mentioned constituent elements, or the conversion of these expressions into methods, apparatus, systems, storage media, computer programs, etc., are also included in this disclosure.
[0010] Invention Effects According to this disclosure, the fluid being stirred in the mixing tank can be effectively stirred without the need for specially shaped stirring blades. Attached Figure Description
[0011] Figure 1 The structure of the stirring device according to the first embodiment is shown schematically.
[0012] Figure 2 yes Figure 1 Comparative example of a stirring device.
[0013] Figure 3 This is the flow mode of the first embodiment.
[0014] Figure 4 This is the flow pattern of the comparative example.
[0015] Figure 5 The structure of the stirring device is schematically shown as a variation of the first embodiment. Detailed Implementation
[0016] Hereinafter, with reference to the accompanying drawings, a method for implementing this disclosure (hereinafter also referred to as an embodiment) will be described in detail. In the description and / or drawings, the same or equivalent constituent elements, components, processes, etc., are labeled with the same reference numerals, and repeated descriptions are omitted. The scale and shape of the parts shown in the drawings are provided for convenience in simplifying the description and are not intended to be limiting unless specifically mentioned. The embodiments are illustrative and do not limit the scope of this disclosure in any way. Not all features and combinations thereof described in the embodiments are essential to the essence of this disclosure.
[0017] Figure 1 The structure of the stirring device 1 according to the first embodiment of this disclosure is schematically shown. In this embodiment, the stirring device 1 is moved along... Figure 1The vertical direction, also known as the vertical direction, is used interchangeably with the terms "vertical" and "left-right" (or "lateral"). Furthermore, this disclosure is also applicable to a stirring device 1 that is not arranged along the vertical direction. In this case, the vertical direction, vertical direction, and height direction are different from the vertical direction, and the left-right direction, lateral direction, and horizontal direction are different from the horizontal direction. As will be described later, since the rotation axis 30 of the stirring blade 3 is arranged along the vertical, vertical, height, and vertical directions, these directions are also referred to as the axial direction. Additionally, since the left-right, lateral, and horizontal directions define the diameter of the stirring tank 2 or the stirring blade 3, these directions are also referred to as the radial direction.
[0018] The stirring device 1 includes a stirring tank 2 for containing a fluid (fluid to be stirred) and stirring blades 3 for stirring the fluid within the stirring tank 2 by rotation. The stirring tank 2 includes a cylindrical section 21 extending axially from the top and a bottom section 22 continuously disposed below the cylindrical section 21. The inner circumferential wall or side wall of the cylindrical section 21 has a circular cross-section when viewed from above (axially upwards), and its diameter D is referred to below as the tank diameter D of the stirring tank 2. Furthermore, the cross-section of the cylindrical section 21 and / or the stirring tank 2 when viewed from above can be any non-circular shape. In this case, the tank diameter D of the stirring tank 2 can be the diameter of the inscribed circle of the cross-section shape, the diameter of the circumscribed circle of the cross-section shape, or an average or intermediate value thereof. At least a portion of the upper part of the cylindrical section 21 is open (not shown) in a manner that allows the fluid to be stirred to be introduced, and can be closed using a cover or the like during the stirring of the fluid by the stirring blades 3. In addition, the fluid to be stirred can also be supplied to the stirring tank 2 from a fluid supply port such as a supply nozzle that can be provided on the side of the straight cylinder 21.
[0019] The bottom 22 of the mixing tank 2 can also be formed as an inverted cone shape or an inverted frustum shape with the diameter decreasing downwards. Furthermore, the bottom 22 can also be formed as a plane with the axial direction as the normal direction. In the illustrated example, the bottom 22 is formed as a curved shape bulging downwards from the lower end of the straight cylindrical portion 21. The bottom of the mixing tank 2 is formed at the center of the bottom 22 by the bulging end of the curved shape. At the bottom of the mixing tank 2, a discharge port (not shown) can be provided to discharge the fluid inside the mixing tank 2 to the outside of the mixing device 1. This discharge port is configured to be openable and closed by a valve or other discharge port opening / closing mechanism. When fluid to be stirred is added to and held in the mixing tank 2, or when the fluid before discharge is stirred by the stirring blades 3 to promote mixing or a chemical reaction, or to homogenize the concentration, the discharge port is closed by a valve or other mechanism controlled to be closed. Furthermore, when the mixing or chemical reaction is substantially completed and the concentration is homogenized, and fluid to be discharged is to be stirred by the stirring blades 3 as needed, the discharge port is opened by a valve or other mechanism controlled to be open. Additionally, the stirred fluid can be discharged from an opening such as the top of the stirring tank 2 when the cover is open. Furthermore, the stirred fluid can be discharged outside the stirring tank 2 from a fluid discharge port such as a discharge nozzle that can be provided on the side of the straight cylinder 21.
[0020] The horizontal boundary line between the roughly cylindrical straight section 21 and the curved bottom 22 is also called the tangent TL. Hereinafter, the vertical distance L between the lowest part of the stirring tank 2 (bottom 22) and the surface or liquid level LL of the fluid within the stirring tank 2 is referred to as the liquid level height or reference height. In this embodiment, the ratio L of the liquid level L in the height direction of the stirred fluid within the stirring tank 2 to the radial diameter D of the stirring tank 2 is 1.2 or more. This longitudinally longer stirring tank 2 increases the area of the sidewalls serving as heat dissipation surfaces, thus making it suitable for stirring fluids with significant heat of reaction (chemical reactions). Examples of such chemical reactions include polymerization. Furthermore, when the bottom 22 is planar, the vertical distance L between the planar bottom 22 (base plate) and the surface or liquid level LL of the fluid within the stirring tank 2 can also be used as the liquid level height.
[0021] The stirred fluid used for polymerization includes water, which is the target of polymerization, and a monomer. In this embodiment, a monomer could be a polyol, such as a raw material for a polymer (polymer) like polyurethane, but it is not limited to this. The polyol, in which water is dispersed in the stirred tank 2, is typically mixed with an isocyanate in a section (not shown) of the stirring apparatus 1 to generate polyurethane. In a typical polymerization reaction, an emulsifier (surfactant, etc.) and a polymerization initiator (free radical generator, etc.) are also added to the stirred fluid. The physical properties of these stirred fluids are arbitrary, but in this embodiment, the stirred fluid has, for example, a density of 1000 kg / m³. 3The viscosity is 1000 cP. Water in the stirred fluid is uniformly dispersed in the polyol by the stirring of the rotating agitator 3, and a homogeneous polymer is obtained by reacting with isocyanate.
[0022] The stirring blade 3 is configured to rotate about a vertically oriented rotational axis 30 that is approximately aligned with the vertical central axis of the stirring tank 2. Although not shown in the figure, a rotational drive unit such as a motor that generates rotational power, and a rotational power conversion unit such as a speed reducer or gearbox that converts the rotational power into a desired rotational speed (or rotational velocity) or torque are provided above the rotational axis 30. A lower bearing may also be provided below the rotational axis 30.
[0023] Near the inner circumferential wall of the straight cylindrical portion 21 within the mixing tank 2, a baffle 4 is provided. This baffle 4 covers most of the liquid level height L, extends approximately axially, and protrudes approximately radially toward the central axis of the mixing tank 2 (or the rotation axis 30 of the stirring blade 3). As shown in the example, multiple baffles 4 can be provided circumferentially. The stirred fluid, which rotates circumferentially by the stirring blade 3, impacts the baffle 4, also known as a flow deflector, thereby preventing the stirred fluid from exhibiting a flow-coupling phenomenon due to inertia and rotating synchronously with the stirring blade 3. Furthermore, the baffle 4 must not obstruct the rotation of the stirring blade 3 itself and is positioned in a radial range further outward than the rotational areas of the multiple blade portions 31A to 31D described later.
[0024] The stirring blade 3 has multiple blades arranged separately in the height direction (axial direction). Figure 1 In this example, there are four wings 31A to 31D (hereinafter, collectively referred to as wings 31). In this embodiment, an example in which the wing diameter d of each wing 31A to 31D is substantially equal will be described, but the wing diameter d of each wing 31A to 31D may be different from each other. Each wing 31A to 31D is a small stirring blade, which has a generally straight or generally planar wing body 32A to 32D (hereinafter, collectively referred to as wing body 32) extending generally radially from the rotation axis 30.
[0025] One or more (in the connection between each wing body 32A-32D and the rotation shaft 30) are provided. Figure 1 In this example, there are two blades 33A to 33D (hereinafter collectively referred to as blades 33), which generate a flow of the stirred fluid with a predetermined directional component by rotating about a rotation axis 30. Blades 33 are formed, for example, of a generally rectangular plate, with the normal direction of its stirring surface inclined relative to both the axial and radial directions, thus generating a flow of the stirred fluid with an axial component (axial flow) by rotating about the rotation axis 30. Figure 1In the example, by rotating the blades 33 on each wing 31 integrally with the rotation axis 30 and the wing body 32 along the rotation direction R shown in the figure (clockwise when viewed from above), a downward axial flow FA of the stirred fluid with a height component (downward component) toward the bottom 22 of the stirring tank 2 is generated. D ~FD D (Hereinafter referred to as descending axial flow F) D Additionally, in Figure 1 In the example, the wing 31 is an inclined stirring blade, that is, the normal direction of the stirring surface of one or more blades 33 is inclined at an acute angle with respect to both the axial and radial directions. However, some or all of each wing 31A to 31D may also be composed of an axial flow propeller such as a hydrofoil.
[0026] Generates a descending axial flow F D The blades 33 are positioned on the radial center side of the stirring blade 3, i.e., on the side of the rotating shaft 30, thus causing the downward axial flow F D It descends axially near the rotating shaft 30. On the other hand, as described later, on the radially outer periphery of the stirring blade 3, i.e., near the inner peripheral wall of the stirring tank 2 or the baffle 4, the stirred fluid circulating or convection within the stirring tank 2 generates a descending axial flow F along the central side. D The upward axial flow FA in the opposite direction U ~FD U (Hereinafter referred to as the ascending axial flow F) U ). Upward axial flow F U It has a height component (upward component) that leaves the bottom 22 of the mixing tank 2, and rises axially near the inner peripheral wall or baffle 4 of the mixing tank 2.
[0027] To achieve the desired circulating flow described later within the mixing tank 2, the height dimension (hereinafter referred to as height) of the blade 33 is either larger or smaller closer to the wing 31 at the bottom 22 of the mixing tank 2. Specifically, the height of the blade 33 is configured to be smaller closer to the upstream side of the axial flow directly generated by the blade 33 and larger closer to the downstream side. Figure 1 In the example, blade 33 directly generates a downward axial flow F. D The blades 33 closer to their upstream side have smaller heights (e.g., the uppermost blade 33A has the smallest height), while the blades 33 closer to their downstream side have larger heights (e.g., the lowermost blade 33D has the largest height). Furthermore, for two adjacent wings 31 in the height direction, the height and radial dimension of the blades 33 can be equal or different.
[0028] In order to achieve the desired circulating flow described later within the mixing tank 2, the height ratio of the shorter blade 33 to the taller blade 33 is preferably set to be less than 0.8 for two adjacent blades 31 in the height direction. Specifically, for two adjacent blades 31A and 31B in the height direction, the height ratio of the shorter blade 33A to the taller blade 33B is preferably set to be less than 0.8; for two adjacent blades 31B and 31C in the height direction, the height ratio of the shorter blade 33B to the taller blade 33C is preferably set to be less than 0.8; and for two adjacent blades 31C and 31D in the height direction, the height ratio of the shorter blade 33C to the taller blade 33D is preferably set to be less than 0.8.
[0029] Multiple blades 31A to 31D can be arranged at approximately equal intervals along the height direction, or, as illustrated in the example, they can be arranged at different intervals h1 to h3 (hereinafter collectively referred to as interval h) along the height direction. To achieve the desired circulating flow described later within the mixing tank 2, each interval h1 to h3 can also be adjusted. For example, as described above, the height of the blades 33 can be increased closer to the bottom 22 of the mixing tank 2, while the height interval h of each blade 31 can be increased closer to the bottom 22 of the mixing tank 2 (e.g., h1 ≤ h2 ≤ h3).
[0030] Furthermore, in order to achieve the desired circulating flow described later in the mixing tank 2, it is preferable to set the distance (i.e., the interval h) in the height direction between two adjacent wings 31 in the height direction to be less than or equal to the wing diameter d of each wing 31 (h≤d).
[0031] Figure 2 yes Figure 1 A comparative example of stirring device 1. This stirring device 1 is compared with... Figure 1 The stirring device 1 in this embodiment differs only in the structure of the stirring blade 3. Specifically, in Figure 2 In the stirring blade 3, the height of the blades 33A-33C, which are provided with multiple wing sections 31A-31C, remains constant regardless of the height within the stirring tank 2. Furthermore, Figure 2 The number of wings 31 on the stirring blade 3 (3) is greater than that of the stirring blade 3. Figure 1 The number of wing sections 31 on the stirring blade 3 is small (4). Furthermore, in Figure 2 In the stirring blade 3, the distance in the height direction between two adjacent blades 31 (i.e., the interval h1, h2) is greater than the diameter d of each blade 31 (h>d).
[0032] Figure 3 and Figure 4 This is about this implementation method ( Figure 1 ) and comparative examples ( Figure 2), to visualize the flow pattern of the stirred fluid in the stirred tank 2.
[0033] exist Figure 4 In the flow pattern of the comparative example shown, an upper circulating flow PCF1 is formed, which partially circulates in the upper part of the stirred tank 2 through the upper wing 31A, and a lower circulating flow PCF2 is formed, which partially circulates in the lower part of the stirred tank 2 through the lower wing portions 31B and 31C. The circulation directions of the upper circulating flow PCF1 and the lower circulating flow PCF2 are opposite to each other. That is, near the rotation shaft 30 (inner circumference side), the upper circulating flow PCF1 rises axially, while the lower circulating flow PCF2 falls axially; on the outer circumference side of the stirring blade 3, the upper circulating flow PCF1 falls axially, while the lower circulating flow PCF2 rises axially.
[0034] In particular, on the outer periphery of the stirring blade 3, the descending upper circulating flow PCF1 and the rising lower circulating flow PCF2 collide with approximately the same intensity, resulting in the formation of a flow partition wall W between the upper blade 31A and the lower blade 31B. This results in the interior of the stirring tank 2 being divided into upper and lower parts by the partition wall W, thus deteriorating the overall stirring performance of the stirring device 1. Furthermore, because the stirred fluid is retained in the partition wall W, low-density monomers and polymers easily adhere to the inner peripheral wall and baffle 4 of the stirring tank 2 near the partition wall W.
[0035] Through unique research, the main reason for the formation of the partition wall W between the wings 31 was determined to be because... Figure 2 In the comparative example, the height of the blades 33 on each wing 31 remains constant. That is, since the height of the upper blade 33A, which mainly contributes to the formation of the upper circulating flow PCF1, is equal to the height of the lower blades 33B and 33C, which mainly contribute to the formation of the lower circulating flow PCF2, the upper circulating flow PCF1 and the lower circulating flow PCF2 oppose or collide to form the partition wall W.
[0036] Therefore, in Figure 1 In this embodiment, as described above, the height of the blade 33 is greater the closer it is to the wing 31 at the bottom 22 of the mixing tank 2. As a result, as... Figure 3 The flow pattern shown in this embodiment forms a circulating flow CF that circulates throughout the entire mixing tank 2 via all the wings 31A to 31D. It can be considered that this is due to the reduction in the size of the comparative example (…). Figure 4The height of blade 33A above the upper circulating flow PCF1, which counteracts the lower circulating flow PCF2, results in the weakened upper circulating flow PCF1 being entrained (or swallowed up) by the strong lower circulating flow PCF2, forming a large circulating flow CF. Furthermore, as described above, factors contributing to achieving the desired circulating flow CF include: setting the height ratio of the smaller blade 33 to the larger blade 33 to less than 0.8 for two adjacent wings 31 in the height direction; adjusting the height-direction spacing h of each wing 31; and setting the height-direction spacing h of each wing 31 to be less than or equal to the wing diameter d of each wing 31.
[0037] The circulating flow CF descends axially from the uppermost wing 31A to the lowermost wing 31D near the rotation axis 30 (inner circumference side), and rises axially from the lowermost wing 31D to the uppermost wing 31A on the outer circumference side of the stirring blade 3. Thus, the circulating flow CF, circulating over a wide area between the uppermost and lowermost parts within the longitudinally long stirring tank 2, effectively mixes the fluid being stirred within the stirring tank 2, achieving uniform concentration, and effectively stirs the fluid as it passes through the wing 31A to 31D sequentially. As a result, the overall stirring performance of the stirring device 1 is significantly improved. Furthermore, since no formation as in the comparative example (… Figure 4 The partition wall W, being so well-designed, prevents the stirred fluid from becoming trapped between the blades 31, thus making it difficult for monomers and polymers to adhere to the inner wall of the stirring tank 2 or the baffle 4. Furthermore, when the stirring device 1 is used for suspension polymerization accompanied by particle precipitation, the uniformity of the monomers dispersed in the stirring tank 2 can be improved, thus resulting in uniform particles with small particle size deviations.
[0038] Figure 5 schematically shown Figure 1 The structure of the stirring device 1 in the modified example of the first embodiment. For comparison with... Figure 1 The same components are labeled with the same reference numerals, and repeated descriptions are omitted. This stirring device 1 and... Figure 1 The stirring device 1 of the first embodiment differs only in the structure of the stirring blade 3.
[0039] The blades 33 of each wing 31 of the stirring blade 3 rotate integrally with the rotating shaft 30 and the wing body 32 in the rotation direction R' (counterclockwise when viewed from above) shown in the figure, generating an upward axial flow FA of the stirred fluid having a height component (upward component) leaving the bottom 22 of the stirring tank 2. U ~FD U (Hereinafter referred to as the ascending axial flow F) U ).
[0040] Due to the generation of an upward axial flow F UThe blades 33 are positioned on the radial center side of the stirring blade 3, i.e., on the side of the rotating shaft 30, thus the upward axial flow F U It rises axially near the rotating shaft 30. On the other hand, on the radial outer periphery of the stirring blade 3, that is, near the inner peripheral wall of the stirring tank 2 or the baffle 4, the stirred fluid circulating or convection within the stirring tank 2 generates an upward axial flow F on the central side. U The axial flow FA in the opposite direction D ~FD D (Hereinafter referred to as descending axial flow F) D ). Downward axial flow F D It has a height component (downward component) toward the bottom 22 of the mixing tank 2, and descends axially near the inner peripheral wall or baffle 4 of the mixing tank 2.
[0041] In order to achieve [the desired effect] within the mixing tank 2 Figure 3 For the same desired circulating flow CF (but in the opposite direction), the height of blade 33 is formed such that it is smaller closer to the upstream side of the axial flow directly generated by blade 33 and larger closer to the downstream side. Figure 5 In the example, the upward axial flow F is directly generated by blade 33. U Therefore, the lower the blade 33 is closer to its upstream side, the smaller its height is formed (for example, the lowest blade 33D is the smallest), and the higher the blade 33 is closer to its downstream side, the larger its height is formed (for example, the highest blade 33A is the largest).
[0042] In order to achieve [the desired effect] within the mixing tank 2 Figure 3 For the same desired circulating flow CF (but in the opposite direction), it is preferable that for two adjacent wings 31 in the height direction, the height ratio of the smaller blade 33 to the larger blade 33 is set to be less than 0.8. Specifically, for two adjacent wings 31A and 31B in the height direction, it is preferable that the height ratio of the smaller blade 33B to the larger blade 33A is set to be less than 0.8; for two adjacent wings 31B and 31C in the height direction, it is preferable that the height ratio of the smaller blade 33C to the larger blade 33B is set to be less than 0.8; and for two adjacent wings 31C and 31D in the height direction, it is preferable that the height ratio of the smaller blade 33D to the larger blade 33C is set to be less than 0.8.
[0043] Multiple wing sections 31A to 31D can be arranged at approximately equal intervals along the height direction, or, as shown in the example, they can be arranged at different intervals h1 to h3 (hereinafter collectively referred to as interval h) along the height direction. This is to achieve [the desired effect] within the mixing tank 2. Figure 3The same desired circulating flow CF (but in the opposite direction) can be achieved by adjusting the intervals h1 to h3. For example, as described above, the height of the blades 33 can be reduced as they approach the bottom 22 of the mixing tank 2, while the interval h in the height direction of each wing 31 can be reduced as it approaches the bottom 22 of the mixing tank 2 (e.g., h1≥h2≥h3).
[0044] Furthermore, in order to achieve [the desired effect] within the mixing tank 2... Figure 3 For the same desired circulating flow CF (but in the opposite direction), it is preferable to set the distance (i.e., the interval h) in the height direction between two adjacent wings 31 in the height direction to be less than the wing diameter d of each wing 31 (h≤d).
[0045] according to Figure 5 The stirring device 1 is capable of achieving mixing within the stirring tank 2. Figure 3 The same desired circulating flow CF (but in the opposite direction). This circulating flow CF (not shown in the figure) rises axially from the lowermost wing 31D toward the uppermost wing 31A near the rotation axis 30 (inner circumferential side), and descends axially from the uppermost wing 31A toward the lowermost wing 31D on the outer circumferential side of the stirring blade 3. In this way, the fluid being stirred in the stirring tank 2 is effectively mixed by the circulating flow CF, which circulates over a wide range between the uppermost and lowermost parts in the longitudinally long stirring tank 2, so as to homogenize the concentration, and is effectively stirred by the wing 31A to 31D that the circulating flow CF passes through in sequence. As a result, the overall stirring performance of the stirring device 1 is greatly improved. Furthermore, since no formation as in the comparative example ( Figure 4 With such a partition wall W, the stirred fluid is difficult to remain between the blades 31, so monomers and polymers are difficult to adhere to the inner peripheral wall and baffle 4 of the stirring tank 2.
[0046] The present disclosure has been described above based on embodiments. Various modifications may be made to the combinations of constituent elements or processes in the exemplary embodiments, and such modifications are also included within the scope of this disclosure, as will be apparent to those skilled in the art.
[0047] In the first embodiment ( Figure 1The example shown illustrates a blade 33 that generates axial flow, but blades 33 that generate axial flow and blades 33 that generate radial flow can also be combined (intertwined). For example, a wing 31 having blades 33 that generate axial flow and a wing 31 having blades 33 that generate radial flow can be provided on the same stirring blade 3. Furthermore, both blades 33 that generate axial flow and blades 33 that generate radial flow can be provided on at least one wing 31. In addition, at least one blade 33 on at least one wing 31 can generate both axial flow and radial flow simultaneously. In these variations, it is preferable that the blade 33 is larger or smaller the closer it is to the bottom 22 of the stirring tank 2.
[0048] Furthermore, the configuration, function, and purpose of each device or method described in the embodiments can be implemented using hardware resources, software resources, or through the cooperation of hardware and software resources. Hardware resources include, for example, processors, ROMs, RAMs, and various integrated circuits. Software resources include, for example, operating systems, application programs, and other programs.
[0049] Industrial availability This disclosure relates to a stirring device, etc.
[0050] Symbol Explanation 1-Agitator, 2-Agitator tank, 3-Agitator blade, 21-Straight cylinder, 22-Bottom, 30-Rotating shaft, 31-Wing, 33-Blade.
Claims
1. A stirring apparatus comprising stirring blades for stirring a fluid contained in a stirring tank by rotation, wherein, The stirring blade has multiple wing portions that are separately arranged in the height direction of the stirring tank. Each wing is equipped with blades that generate a flow of the stirred fluid having a height component in the stirring tank by rotation. The closer the wing is to the bottom of the mixing tank, the larger or smaller the dimension of the blade in the height direction.
2. The stirring device according to claim 1, wherein, The blades on each wing generate a flow of the stirred fluid with a height component toward the bottom of the stirring tank by rotation. The closer the wing is to the bottom of the mixing tank, the larger the dimension of the blade in the height direction.
3. The stirring device according to claim 1, wherein, The blades on each wing generate a flow of the stirred fluid with a height component away from the bottom of the stirring tank by rotation. The closer the wing is to the bottom of the mixing tank, the smaller the dimension of the blade in the height direction.
4. The stirring device according to claim 1, wherein, The blades on each of the wing portions generate a flow of the stirred fluid having a radial component of the stirring groove by rotation.
5. The stirring apparatus according to any one of claims 1 to 4, wherein, For two adjacent wings in the height direction, the ratio of the height direction dimension of the blade with the smaller height direction dimension to the height direction dimension of the blade with the larger height direction dimension is less than 0.
8.
6. The stirring apparatus according to any one of claims 1 to 4, wherein, The height distance between two adjacent wings in the height direction is less than the radial diameter of the stirring tank of each wing.
7. The stirring apparatus according to any one of claims 1 to 4, wherein, The ratio L / D of the height of the fluid being stirred in the vertical direction to the radial diameter D of the stirring tank is 1.2 or more.
8. The stirring apparatus according to any one of claims 1 to 4, wherein, The stirring blade has three or more blades arranged separately in the height direction.
9. The stirring apparatus according to any one of claims 1 to 4, wherein, The stirred fluid comprises a medium and monomers. The polymerization of the monomers is promoted by the stirring of the rotating agitator blades.
10. A stirring method, wherein the stirring method is performed in a stirring apparatus equipped with stirring blades that stir a fluid contained in a stirring tank by rotation, wherein, The stirring blade has multiple wing portions arranged separately along the height direction of the stirring tank. Each wing portion has blades, and the blades have larger or smaller dimensions along the height direction as they approach the bottom of the stirring tank. The rotation of each blade generates a flow of the stirred fluid having a height component in the stirring tank.