JP2015085218A - Agitation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an agitation device that can improve agitation performance.SOLUTION: An agitation device includes: an agitation tank 1 having a shaft insertion opening 7; an agitating shaft 8 that is inserted through the shaft insertion opening 7 so that its tip end is located inside the agitation tank 1 and its base end is located outside the agitation tank 1; an agitating blade 9 that is provided at a tip end of the agitating shaft 8; a bearing part 12 that supports the agitating shaft 8; and a drive device 13 that is connected to the base end of the agitating shaft 8 and makes the agitating shaft 8 perform a rotating motion so that the tip end of the agitating shaft 8 draws a circle with a bearing center C of the bearing part 12 as a fulcrum. The agitating blade 9 comprises two or more plate-shaped blade members 9B that extend radially about the agitating shaft 8 and are fixed to the agitating shaft 8 at one side edge 9B1 thereof. Each of the blade members 9B is formed into a long plate shape that is long in the axial direction of the agitating shaft 8, and the other side edge 9B2 facing the one side edge 9B1 is formed so that a clearance between the other side edge 9B2 and a center line of the agitating shaft 8 becomes smaller in a direction from the tip end to base end of the agitating shaft 8.

Description

  The present invention relates to an agitation apparatus used for agitation processes such as mixing, dissolution, crystallization, concentration, slurry suspension and gas-liquid contact of liquids or slurries mainly in production processes in the pharmaceutical and chemical fields.

  In a conventional stirring device, a stirring device is proposed in which the stirring shaft is swung so that the tip (lower end) of the stirring shaft in a stirring tank forms a circle with a predetermined portion of the upper half of the stirring shaft as a fulcrum. (For example, refer to Patent Documents 1 to 3).

  In this way, excellent stirring performance can be obtained by rotating the stirring shaft so that the tip of the stirring shaft forms a circle.

JP 2013-81930 A Japanese Utility Model Publication No. 60-115532 JP-A-48-27357

  Although the above-described conventional stirring apparatus can obtain a certain level of stirring performance, it is desired to obtain even better stirring performance.

  The present invention has been made to solve the above-described problems, and provides an agitation device capable of improving the agitation performance in an agitation device that rotates the agitation shaft so that the tip of the agitation shaft forms a circle. The purpose is to do.

  In order to achieve the above object, an agitation apparatus according to an aspect of the present invention includes an agitation tank having a shaft insertion port, a distal end located inside the agitation tank, and a proximal end outside the agitation tank. A stirring shaft inserted through the shaft insertion port, a stirring blade provided at the tip of the stirring shaft, a bearing that supports the stirring shaft, and a base end of the stirring shaft so as to be positioned A drive device for causing the stirring shaft to perform a turning motion so that the tip of the stirring shaft forms a circle with the bearing center of the bearing portion as a fulcrum, the stirring blade having one side edge portion It consists of two or more plate-like blade members fixed to the stirring shaft and extending radially around the stirring shaft, and the blade member is a long plate shape long in the axial direction of the stirring shaft, and The distance between the other side edge facing the one side edge and the center line of the stirring shaft is The other side edge portion from the tip of 拌軸 to become smaller toward the direction of the base end is formed.

  According to this configuration, the mixing completion time can be shortened and the stirring performance can be improved.

  The other side edge portion of the blade member is formed in a straight line, and an angle formed between a straight line along the other side edge portion and a center line of the stirring shaft is a vertical line passing through the bearing center of the bearing portion. The angle is preferably equal to or greater than the angle formed with the center line of the stirring shaft.

  According to this structure, the stirring of the lower center part of a stirring tank becomes easy, and stirring performance can be improved more.

  It has a hollow space through which the agitation shaft is inserted, one end is fixed to the shaft insertion port of the agitation tank, and the other end is fixed to the agitation shaft. You may further provide the cylindrical bending holding part to do.

  According to this configuration, it is possible to prevent foreign matter from entering the stirring tank. In addition, since excellent stirring performance can be obtained even if the stirring shaft is swung at a low speed, the life of the bending holding portion can be extended by swirling the stirring shaft at a low speed.

  INDUSTRIAL APPLICABILITY The present invention has the configuration described above, and has an effect that the stirring performance can be improved in the stirring device that rotates the stirring shaft so that the tip of the stirring shaft draws a circle.

It is the partial cross section figure which looked at the stirring apparatus of an example of embodiment of this invention from the front. It is an enlarged view of the upper part of the stirring apparatus shown in FIG. (A) is the front view of the stirring shaft with a wing | blade of the stirring apparatus shown in FIG. 1, (b) is the figure which looked at the stirring shaft with a wing | blade from the downward direction. (A), (b), (b), (d) is the schematic diagram which looked at the stirring shaft with a blade | wing in the case of Example 1, Example 2, Comparative Example 1, and Comparative Example 2, respectively from the upper part and the front. is there. 6 is a graph showing n · θm-Re curves derived from the results of mixing tests in the case of Example 1, Example 2, Comparative Example 1, and Comparative Example 2. It is a graph which shows the solid-liquid stirring characteristic by each of the stirring apparatus of an example of embodiment of this invention, and the stirring apparatus of two comparative examples. It is a graph which shows the liquid-liquid stirring characteristic by each of the stirring apparatus of an example of embodiment of this invention, and the stirring apparatus of two comparative examples. It is a figure which illustrates the aspect with the stirring shaft with a blade | wing of the stirring apparatus shown in FIG. 1, (a) is a front view, (b) is a rear view, (c) is a top view, (d) is a bottom view, e) is a left side view, (f) is a right side view, (g) is a perspective view, and (h) is an AA cross-sectional view of (e). It is a figure which illustrates the other aspect of the stirring shaft with a blade | wing of the stirring apparatus shown in FIG. 1, (a) is a front view, (b) is a rear view, (c) is a top view, (d) is a bottom view, (E) is a left side view, (f) is a right side view, (g) is a perspective view, and (h) is an AA cross-sectional view of (e).

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference symbols throughout all the drawings, and redundant description thereof is omitted. Further, the present invention is not limited to the following embodiment.

(Embodiment)
FIG. 1 is a cross-sectional view of an example of a stirring device according to an embodiment of the present invention, and FIG. 2 is an enlarged view of an upper portion of the stirring device shown in FIG. 3A is a front view of the stirring shaft with blades of the stirring device shown in FIG. 1, and FIG. 3B is a view of the stirring shaft with blades as viewed from below.

  This stirrer is mainly used in stirring processes such as mixing, dissolution, crystallization, concentration, slurry suspension and gas-liquid contact of liquids or slurries in production processes in the pharmaceutical and chemical fields.

  The stirring device includes a stirring tank 1, a stirring shaft 10 with a blade provided with a stirring blade 9 at the tip (lower end) of the stirring shaft 8, and a bearing portion 12 of the stirring shaft 10 with a blade (stirring shaft 8). , A drive device 13 for causing the bladed stirring shaft 10 (stirring shaft 8) to perform a turning motion, a bending holding portion 16 and the like are provided. This stirrer is such that the tip (lower end) of the stirring shaft 8 forms a circle with a predetermined portion (bearing center C of the bearing portion 12) in the upper half of the stirring shaft 10 with a blade (stirring shaft 8) as a fulcrum. The attached stirring shaft 10 (stirring shaft 8) is configured to perform a turning motion. The bladed stirring shaft 10 may be referred to as a bladed stirring shaft 10, a shafted stirring blade 10, or a shafted stirring blade 10 or the like.

  The stirring tank 1 includes a container body 2 and an upper lid 3 fixed to the container body 2 by a plurality of clamps 25 (only one is shown in FIG. 1). The container body 2 is formed in a substantially cylindrical shape and has a bottom wall. The upper lid 3 is provided with a charging port 6 for charging the raw material into the container body 2 and a shaft insertion port 7 through which the stirring shaft 8 is inserted. The bottom wall of the container body 2 is provided with a discharge port 4 for discharging the mixture obtained by stirring from the stirring tank 1. Raw material is charged from the charging port 6 in a state where the discharge port 4 is closed by a valve (not shown). The axis A of the stirring tank 1 (container body 2) is directed in the vertical (vertical) direction. The shaft insertion port 7 is formed in a substantially circular shape in plan view, and the center line of the shaft insertion port 7 coincides with the axis A of the stirring tank 1. A jacket 40 is joined to the outer surface of the container main body 2, and the temperature in the agitation tank 1 can be managed by circulating a cooling medium between the inner surface of the jacket 40 and the outer surface of the container main body 2. Yes.

  A baffle 5 is provided in the stirring tank 1. The baffle 5 is attached to the upper lid 3 or the container body 2 by appropriate attachment means (not shown).

  A housing 11 is fixed to the upper lid 3 of the stirring tank 1. A bearing portion 12 and a drive device 13 are attached to the housing 11. The housing 11 includes a base member 11a fastened to a mount portion 3a protruding upward from the upper lid 3 of the stirring tank 1, a support member 11b fixed on the base member 11a and extending in the vertical direction, and an upper end of the support member 11b. A fixed upper plate member 11c and a mounting member 11d fixed in the middle of the support member 11b are provided. In addition, the support member 11b may be comprised with the cylinder, and may be comprised with the several steel materials arrange | positioned at intervals. Further, a plurality of fastening locations between the base member 11a and the mount portion 3a may be provided.

  As shown in FIG. 2, an annular mounting member 21 is fixed to the middle mounting member 11 d of the housing 11, and a funnel-shaped mounting is performed so as to be sandwiched between the mounting member 21 and the annular mounting member 22. The member 23 is fixed. The annular mounting member 22 has a split structure, and is fixed to the mounting member 21 using bolts. The bearing portion 12 is fixed to the lower end of the funnel-shaped attachment member 23.

  The bearing portion 12 is constituted by a spherical plain bearing having an inner ring 12a and an outer ring 12b. The outer ring 12b is clamped and fixed to the lower end of the funnel-shaped mounting member 23 by the mounting member 23 and the mounting member 24 therebelow. The stirring shaft 8 is inserted through the inner ring 12a and supported by the inner ring 12a. The axis B of the stirring shaft 8 intersects the axis A of the stirring tank 1 at the bearing center C of the bearing portion 12 and has an inclination angle α (hereinafter referred to as “axis inclination angle α”) with respect to the axis A of the stirring tank 1. Inclined. The center of the inner ring 12a is the bearing center C.

  A driving device 13 is attached to the upper plate member 11 c of the housing 11. The driving device 13 includes an actuator 14 such as an electric motor and a rotating unit 15 rotated by the actuator 14. The rotating part 15 includes a rotating shaft 15a connected to the drive shaft of the actuator 14, a connecting member 15b attached to the rotating shaft 15a so as to be swingable about a swinging shaft 15d, and a shaft fixed to the connecting member 15b. It has the attachment part 15c and the connection shaft 18 attached to the axis | shaft attachment part 15c so that rotation was possible. The connecting shaft 18 can be rotated around the central axis of the connecting shaft 18 by a bearing 20 provided in the shaft mounting portion 15c.

  The lower end portion of the connecting shaft 18 is connected to the upper end portion (base end portion) of the stirring shaft 8. Here, the connecting shaft 18 and the stirring shaft 8 are connected so that their center axes coincide with each other.

  As shown in FIG. 3, a hole 8a is provided at the upper end of the stirring shaft 8, and the lower end of the connecting shaft 18 is inserted into the hole 8a. Then, the connecting shaft 18 and the stirring shaft 8 are fixed by a set screw (not shown) through a small hole 8b provided on the side of the hole 8a. Here, a plurality of small holes 8b may be provided, and the connecting shaft 18 and the stirring shaft 8 may be fixed by a plurality of set screws (not shown) through the small holes 8b.

  Further, a sleeve 19 is attached to the stirring shaft 8 so as to contact the upper end of the inner ring 12 a of the bearing portion 12. The sleeve 19 is fixed to the stirring shaft 8 with a bearing nut from above. Thereby, the inner ring 12 a of the bearing portion 12 is sandwiched and fixed between the lower end of the sleeve 19 and the step portion of the stirring shaft 8.

  Here, the connecting shaft 18 is described as being included in the driving device 13 as a part of the rotating unit 15, but the connecting shaft 18 may be considered as a part of the stirring shaft 8. In any case, the base end of the stirring shaft 8 is connected to the driving device 13.

  The axis of the rotating shaft 15 a becomes the rotating axis of the rotating unit 15 and coincides with the axis A of the stirring tank 1. As the rotary shaft 15a rotates, the shaft mounting portion 15c rotates, and thereby the stirring shaft 8 fixed to the connecting shaft 18 performs a turning motion with the bearing center C of the bearing portion 12 as a fulcrum (details will be described later).

  Further, a bending holding portion 16 is accommodated in the housing 11. The bending holding part 16 has a hollow space 16s through which the stirring shaft 8 is inserted. One end portion (lower end portion) of the bending holding portion 16 is fixed to the shaft insertion port 7 of the stirring tank 1, and the other end portion (upper end portion) is fixed to the stirring shaft 8. The bending holding portion 16 can be bent and deformed according to the turning motion of the stirring shaft 8.

  The bending holding portion 16 includes a cylindrical portion 31 made of an elastic body, a lower flange 32 provided at the lower end portion of the cylindrical portion 31, and an upper flange 33 provided at the upper end portion of the cylindrical portion 31. . The cylindrical part 31 has a substantially cylindrical basic shape, and the center part swells to form a hollow space 16s open at both ends. The cylindrical portion 31 has, for example, a surface layer, an intermediate layer, and an inner surface layer from the outside, and these three layers are in close contact with each other in the plate thickness direction of the cylindrical portion 31. The surface layer and the intermediate layer are made of, for example, ethylene propylene diene rubber (EPDM), but other rubber materials may be used, and the two layers are not necessarily required, and may be a single layer. The inner layer is made of a fluororesin material having excellent chemical resistance such as polytetrafluoroethylene (PTFE). The lower flange 32 and the upper flange 33 are annular members having a circular hole in the center, and are manufactured by, for example, a rolled steel material for general structure.

  The lower end portion of the cylindrical portion 31 passes through the circular hole of the lower flange 32 and is then folded back to the end surface (lower surface) of the lower flange 32 and fixed to the end surface. The lower flange 32 is installed on the upper end of the shaft insertion opening 7 from above. An attachment flange 34 is attached to the shaft insertion port 7, and the lower flange 32 has a split structure, and is coupled to the attachment flange 34 using a bolt. Thereby, the lower end part of the bending holding part 16 is fixed to the shaft insertion port 7 of the stirring tank 1.

  The upper end portion of the cylindrical portion 31 is also folded back to the end surface (upper surface) of the upper flange 33 after passing through the circular hole of the upper flange 33 and fixed to the end surface.

  As shown in FIG. 3, a cylindrical mounting portion 8c is provided in a portion slightly below the upper end portion of the stirring shaft 8, and an annular groove 8d is formed on the upper outer peripheral surface of the mounting portion 8c. The collar member 35 (FIG. 2) is fitted into the annular groove 8d.

  At this time, an L-shaped member 38 is disposed at the upper end portion of the cylindrical portion 31, a collar member 35 fitted into the annular groove 8d is disposed thereon, and an annular mounting member 36 is disposed thereon. The In addition, between the member 38 and the cylindrical part 31, and between the member 38 and the attaching part 8c of the stirring shaft 8 are each sealed with an O-ring (not shown). In this state, the outer peripheral end of the upper flange 33 and the outer peripheral end of the annular mounting member 36 are clamped by the fastening band 37. In this way, the upper end portion of the bending holding portion 16 is fixed to the stirring shaft 8. The upper flange 33, the collar member 35, and the attachment member 36 each have a split structure, and are fixed by a tightening band 37.

  In addition, the part which has come out to the end surface (lower surface) of the lower flange 32 of the cylindrical part 31 is pinched | interposed into the opening | mouth part of the shaft insertion port 7, and the lower flange 32, and is pressed by the up-down direction. Further, the portion of the tubular portion 31 that protrudes from the end surface (upper surface) of the upper flange 33 is sandwiched between the upper flange 33 and the flange member 35 together with the buffer member 38 and pressed. Thereby, the inside of the stirring tank 1 is sealed.

  In this stirrer, when the actuator 14 is operated, the rotating portion 15 is rotationally driven around the axis of the rotating shaft 15a, and the shaft attaching portion 15c turns. Thereby, the upper end (base end) of the stirring shaft 8 performs a circular motion so as to draw a circumference around the axis A on a plane orthogonal to the axis A of the stirring tank 1. Then, the lower end (front end) of the stirring shaft 8 also performs a circular motion so as to draw a circumference around the axis A on a plane orthogonal to the axis A of the stirring tank 1. That is, the portion above the bearing portion 12 of the stirring shaft 8 moves so as to stroke the side of the inverted cone having the bearing center C of the bearing portion 12 as the apex and the axis B of the stirring shaft 8 as a generating line. The portion below the portion 12 also moves so as to stroke the side surface of the cone having the bearing center C of the bearing portion 12 as the apex and the axis B of the stirring shaft 8 as the generating line. The stirring blade 9 also moves together with the stirring shaft 8. This movement is referred to herein as a swiveling movement of the stirring shaft 8 or the bladed stirring shaft 10. That is, the substance in the stirring tank 1 is stirred and mixed by the swiveling motion of the bladed stirring shaft 10. In this example, the bearing portion 12 is provided above the shaft insertion port 7 of the agitation tank 1 (outside of the agitation tank 1), and serves as a fulcrum for the turning motion of the agitation shaft 8 or the agitation shaft 10 with blades. C is a predetermined portion of the stirring shaft 8 above the shaft insertion port 7 (outside the stirring tank 1).

  Note that the bladed stirring shaft 10 may be configured so as to be able to perform the above-described turning motion, and the above-described structure, for example, the structure of the rotating part 15, the support structure of the bearing part 12, the structure of the bending holding part 16, and the like are examples. It can be changed as appropriate.

  For example, the container main body 2 and the upper lid 3 are configured as separate bodies in the present embodiment, but may be integrated. In this case, the opening of the shaft insertion port 7 may be made sufficiently large.

  In the present embodiment, the housing 11 for fixing the driving device 13 and the mounting member 21 is fixed to the upper lid 3. However, the present invention is not limited to this, and the driving device 13 and the mounting member 21 are fixed. You may comprise a member as a separate body independently of an apparatus (stirring tank 1).

  Furthermore, the connection structure of the connecting shaft 18 and the stirring shaft 8 is not limited, and a normal connection structure such as bolting or screwing may be employed.

  The main feature of this embodiment is the configuration of the stirring blade 9. As shown in FIG. 3, the stirring blade 9 is constituted by three plate-like blade members 9 </ b> B extending radially around the stirring shaft 8. The three blade members 9B have an equal angle φ1 (= 120 degrees) around the axis, and one side edge portion 9B1 is fixed to the stirring shaft 8. Each blade member 9B has a long plate shape that is long in the axial direction of the stirring shaft 8, and the distance between the other side edge portion 9B2 facing the one side edge portion 9B1 and the center line (axis B) of the stirring shaft 8 is set. The other side edge 9B2 is set to a predetermined angle β (hereinafter referred to as “inclination angle β) with respect to the center line (axis B) of the stirring shaft 8 so as to become smaller in the direction from the front end to the base end of the stirring shaft 8. ”). That is, the other side edge portion 9B2 has an inversely tapered shape having an inclination angle β.

  In the above description, the stirring blade 9 is constituted by the three blade members 9B. However, two or four or more blade members 9B may be provided radially with an equal angle around the axis. .

  Here, in the case where the stirring blade 9 is constituted by three blade members 9B having the reverse taper shape shown in FIG. 4A (Example 1), and four sheets having the reverse taper shape shown in FIG. 4B. When the stirring blade 9 is configured by the blade member 9B (Example 2), when the stirring blade is configured by four rectangular blade members 9C shown in FIG. 4C (Comparative Example 1), FIG. Each of the mixing tests was performed with respect to the case where the stirring blade was configured by the four blade members 9D having the tapered shape shown in (d) (Comparative Example 2).

  FIGS. 4A to 4D are schematic views of the bladed stirring shaft in each case as viewed from above and from the front. 4A is the case of Example 1, FIG. 4B is the case of Example 2, FIG. 4C is the case of Comparative Example 1, and FIG. 4D is the case of Comparative Example 2. It is a schematic diagram of a stirring shaft.

  4A to 4D, the height h of each blade member (9B, 9C, 9D) is 300 mm, and the effective width w at the bottom of each blade member (9B, 9C, 9D) is 70 mm. 4 (a), (b), and (d), the inclination angle β is set to 6.8 degrees. The angle φ1 formed by adjacent blade members (9B) in FIG. 4A is 120 degrees, and the angle φ2 formed by adjacent blade members (9B, 9C, 9D) in FIGS. 4B to 4D is 90 degrees. is there. The lowermost effective width w of the blade member (9B, 9C, 9D) is the distance between the axial center (axis B) of the stirring shaft 8 and the outermost outer end of the blade member (9B, 9C, 9D). It is distance.

  In the mixing test, iodine was added to the starch aqueous solution as a mixture and colored under the same conditions except that the winged stirring shaft was different as described above, and this was stirred with sodium thiosulfate that had a chemical equivalent to the iodine previously added. The mixing completion time, the number of revolutions, and the like were measured by setting the time taken to put into the tank 1 and completely decoloring as the mixing completion time. Such measurement was performed a plurality of times by changing the power (Pv) per unit volume. FIG. 5 shows an n · θm-Re curve derived from the test results.

  In FIG. 5, n is the number of rotations per unit time (the number of revolutions) of the bladed stirring shaft 10, θm is the mixing completion time, and Re is the Reynolds number. The smaller the value of n · θm on the vertical axis, the better the mixing efficiency. As a result when the curve L31 is Example 1, the result when the curve L41 is Example 2, the result when the curve L42 (thin line) is Comparative Example 1, and the result when the curve L43 (dashed line) is Comparative Example 2 is there.

  First, the case where the number of blades is the same and the shape of the blades is different will be examined using the results of Example 2 and Comparative Examples 1 and 2. Since the curve L41 in the second embodiment has a smaller value of n · θm than the curves L42 and L43 in the first and second comparative examples, the second embodiment is more mixed than the first and second comparative examples. It turns out that the efficiency is very good.

  Next, the case of three blades and the case of four blades are examined using the results of Examples 1 and 2. The curve L31 in the first embodiment has a slightly larger value of n · θm than the curve L41 in the second embodiment, so that the mixing efficiency in the first embodiment is slightly inferior to that in the second embodiment. Compared with Comparative Examples 1 and 2, it is very good, and it can be seen that excellent mixing efficiency is obtained while reducing resistance by reducing the number of blades.

  Although not shown in FIG. 5, excellent mixing efficiency can be obtained even if two blades provided with two blade members 9 </ b> B similar to those in Examples 1 and 2 facing each other with the stirring shaft 8 interposed therebetween. Is possible.

  As is apparent from the above mixing test results, in this embodiment, the mixing completion time is reduced by using a stirring blade having two or more blade members 9B having reverse tapered shapes as in Examples 1 and 2. It can be shortened and the stirring performance can be improved.

  Further, in the stirring device of the present embodiment, only the number of blade members 9B is changed, and other conditions such as the shaft inclination angle α, the effective width w of the lowermost portion of the blade member 9B, the height h, and the inclination angle β are the same. For each of the two blades, the three blades, and the four blades, an experiment was conducted to check the load applied to the stirring shaft 8 by adjusting the rotational speed so that the same power was obtained. As a result, when the maximum load applied to the stirring shaft 8 in the case of two blades is 1, the maximum load is about 0.8 in the case of three blades and four blades. Smaller than that. Although there was a slight difference in the maximum load between the three-blade case and the four-blade case, there was no significant difference.

  Thus, from the viewpoint of the load on the stirring shaft 8, three blades or four blades can be used more suitably than two blades. This is considered to be caused by the rotational movement of the stirring shaft 8. In particular, in the case of two blades, the force received by the blades varies greatly depending on the turning position, and as a result, the maximum load applied to the stirring shaft 8 increases.

  Moreover, in this embodiment, when the experiment and examination were performed about the dimension of the blade member 9B, etc., it turned out that the following ranges are preferable. The same applies to the case of three blades and the case of four blades. As shown in FIGS. 4A and 4B, the effective width of the lowermost portion of the blade member 9B is w, the height is h, and the inclination angle is β. The inner diameter (diameter) of the stirring tank 1 is D.

  A preferred range for w / D is 0 <w / D <0.4. When the upper limit of the above range is exceeded, the swirl diameter (shaft inclination angle α) of the stirring blade 9 is reduced in order to prevent the stirring blade 9 (blade member 9B) from contacting the wall surface of the stirring tank 1 and the baffle 5. In this case, there is a disadvantage that a sufficient stirring effect cannot be obtained.

  The height h of the blade member 9B varies depending on the purpose of stirring. For example, if the height h is increased so that the blade member 9B is exposed above the lower end (center) of the vortex generated at the center of the liquid level, the gas-liquid stirring efficiency described later is improved. If the height h is increased and it is not desired to perform gas-liquid stirring, the height h may be decreased.

  A preferable range of the inclination angle β is 0 ° <β ≦ 60 °. When the upper limit of this range is exceeded, there is a disadvantage that the area of the blade becomes small and a sufficient stirring effect cannot be obtained.

  Furthermore, the inclination angle β is more preferably equal to or greater than the axial inclination angle α (β ≧ α). If the inclination angle β is smaller than the axial inclination angle α, the n · θm-Re curve approaches the curves L42 and L43 in FIG.

  Moreover, although the shaft inclination angle α may vary depending on the inner diameter D and the height of the stirring tank 1, it is set to, for example, about 1 to 15 degrees, preferably about 3 to 7 degrees. Note that the swirl diameter (twice the distance between the central axis A of the stirring tank 1 and the tip of the shaft on the central axis B of the stirring shaft 8) is preferably 0.2D to 0.6D, preferably 0.3 to 0.00. More preferably, it is 5D. When the shaft inclination angle α is too large, the load on the bending holding portion 16 is high, and when it is too small, the mixing efficiency may be low.

  In the present embodiment, the inner surfaces of the container body 2 and the upper lid 3 and the outer surface (surface) of the bladed stirring shaft 10 are subjected to a glass lining process.

  Further, as can be seen from FIG. 3 (b), the outer side edge portion 9B2 of each blade member 9B has an arcuate cross section (R) and no edge. As a result, the shearing force applied to the content liquid by agitation is reduced. For example, when the slurry liquid is agitated, the shearing force applied to the solid particles can be reduced, so that the destruction of the particles can be prevented.

  In addition, in this embodiment, the stirring shaft 10 with a blade | wing which has the 2 or more blade member 9B extended radially is provided, and the suction | inhalation intensity | strength of a liquid is strengthened downward from a liquid level by rotating this. be able to. In addition, a large vortex can be generated at the center of the liquid surface. Thereby, the area of the gas-liquid interface is increased, and there is an effect that the upper gas and the lower liquid can be mixed (gas-liquid stirring) efficiently.

  In addition, there is a stirring device (hereinafter referred to as “stirring device X”) having a configuration in which the axis of the stirring shaft extends in the vertical direction and the stirring shaft is rotated (rotated) with the axis serving as the rotation axis of the stirring shaft. Such an agitation device X and the agitation device of this embodiment differ in the motion of the agitation shaft. Therefore, even if the same stirring blade is used for the stirring device X and the stirring device of the present embodiment, the same effect cannot be obtained (the effect is different).

  Next, a stirring device (w = 60 mm, h = 150 mm, β = 6.8 degrees, α = 6.8 degrees) as an example of this embodiment having three blades shown in FIG. 1 and a diagram of Japanese Patent Application Laid-Open No. 2003-33635. 2, a stirring device X (this is referred to as “stirring device X1”) (w = 100 mm (in the case of a rotary blade, usually represented by span (blade width) d, d = 200 mm), h = 60 mm)). And a stirring device X (referred to as “stirring device X2”) equipped with three retreating blades (w = 99 mm (span d = 198 mm as above), h = 27 mm). In order to determine the respective solid-liquid stirring characteristics and liquid-liquid stirring characteristics, tests were conducted. FIG. 6 shows the solid-liquid stirring characteristics derived from the test results, and FIG. 7 shows the liquid-liquid stirring characteristics derived from the test results.

  In the solid-liquid agitation test, 23 vol% of water and an ion exchange resin (specific gravity 1.10) having an average particle diameter of 0.6 mm are placed in an agitation tank and agitation is started, and the particle concentration (ion exchange resin near the liquid surface is changed while changing the rotation speed. The mixing performance can be confirmed by measuring (concentration). At this time, when the average concentration obtained by calculation of the ion exchange resin charged in the stirring tank in advance and the ion exchange resin concentration at the measurement point are substantially the same, it is uniformly suspended (= uniformly stirred). I can say that.

  In FIG. 6, a straight line L60 indicates a uniform floating arrival point, a curved line L61 indicates solid-liquid stirring characteristics when the stirring device of an example of this embodiment is used, and a curved line L62 indicates a case where the stirring device X1 is used. The solid-liquid stirring characteristics are shown, and the curve L63 shows the solid-liquid stirring characteristics when the stirring device X2 is used.

  From FIG. 6, the uniform floating arrival point is reached with a small Pv (power per unit volume) when the stirring device of an example of this embodiment is used, compared to when the stirring devices X1 and X2 are used. It can be seen that the solid-liquid stirring characteristics are excellent.

  In the liquid-liquid dispersion agitation test, water and 20 vol% kerosene (specific gravity 0.8) are charged into the agitation tank, and the agitation is similarly started, and the oil concentration is measured at the lower part of the agitation tank while changing the rotation speed. Thus, the stirring performance can be confirmed. At this time, when the average concentration obtained by calculation of kerosene charged in the stirring tank in advance and the kerosene concentration at the measurement point are substantially the same, it can be said that the particles are uniformly dispersed (= uniformly stirred).

  In FIG. 7, a straight line L70 indicates a uniform dispersion reaching point, a curve L71 indicates a liquid-liquid stirring characteristic when the stirring device of an example of this embodiment is used, and a curve L72 indicates a case where the stirring device X1 is used. The curve L73 shows the liquid-liquid stirring characteristics when the stirring device X2 is used.

  From FIG. 7, the uniform dispersion reaching point is reached with a small Pv (power per unit volume) when the stirring device of the example of the present embodiment is used, compared to when the stirring devices X1 and X2 are used. It can be seen that the liquid-liquid stirring characteristics are excellent.

  FIG. 8 is a diagram illustrating an embodiment of the stirring shaft with blades of the stirring device shown in FIG. 1, (a) is a front view, (b) is a rear view, (c) is a plan view, and (d) is a plan view. (E) is a left side view, (f) is a right side view, (g) is a perspective view, and (h) is an AA cross-sectional view of (e). In FIG. 8, the principal part (part which is going to receive design registration as a partial design in a design registration application) of the stirring axis | shaft with a wing | blade was represented with the continuous line. The main part is specified including FIG. Further, the thin line shown in FIG. 8 is for specifying the shape of the three-dimensional surface.

  Moreover, FIG. 9 is a figure which illustrates the other aspect of the stirring shaft with a blade | wing of the stirring apparatus shown in FIG. 1, (a) is a front view, (b) is a rear view, (c) is a top view, (d) is a bottom view, (e) is a left side view, (f) is a right side view, (g) is a perspective view, and (h) is an AA cross-sectional view of (e). In FIG. 9, the main part (part which is going to receive design registration as a partial design in a design registration application) of the stirring shaft with a blade | wing was represented by the continuous line. The principal part is specified including FIG.9 (e).

  INDUSTRIAL APPLICATION This invention is useful as a stirring apparatus etc. which can improve stirring performance in the stirring apparatus which makes a stirring shaft rotate so that the front-end | tip of a stirring shaft may draw a circle.

DESCRIPTION OF SYMBOLS 1 Stirring tank 7 Shaft insertion port 8 Stirring shaft 9 Stirring blade 9B Blade member 9B1, 9B2 Side edge part 10 Stirring shaft 12 with a blade | wing 13 Bearing part 13 Drive apparatus 16 Deflection holding part

Claims (3)

A stirring tank having a shaft insertion port;
A stirring shaft that is inserted into the shaft insertion port so that a distal end is located inside the stirring vessel and a proximal end is located outside the stirring vessel;
A stirring blade provided at the tip of the stirring shaft;
A bearing that supports the stirring shaft;
A drive device connected to the base end of the stirring shaft and for causing the stirring shaft to perform a turning motion so that the tip of the stirring shaft forms a circle with the bearing center of the bearing portion as a fulcrum;
The stirring blade is composed of two or more plate-like blade members having one side edge portion fixed to the stirring shaft and extending radially around the stirring shaft,
The blade member has a long plate shape that is long in the axial direction of the stirring shaft, and the distance between the other side edge portion facing the one side edge portion and the center line of the stirring shaft is the width of the stirring shaft. The stirring device, wherein the other side edge portion is formed so as to become smaller in the direction from the distal end toward the proximal end.   The other side edge portion of the blade member is formed in a straight line, and an angle formed between a straight line along the other side edge portion and a center line of the stirring shaft is a vertical line passing through the bearing center of the bearing portion. The stirring device according to claim 1, wherein the stirring device is at least an angle formed with a center line of the stirring shaft.   It has a hollow space through which the agitation shaft is inserted, one end is fixed to the shaft insertion port of the agitation tank, and the other end is fixed to the agitation shaft. The stirring device according to claim 1, further comprising a cylindrical bending holding portion.

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