JP2002119838A - Stirring blade and stirring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stirring blade used suitably for the mixing of liquids each having different specific gravity with each other or the mixing of liquids each having different content of a dispersoid and a stirring method using the stirring blade. SOLUTION: The stirring blade is formed by arranging one or plural hollow pipe bodies 12 each having an upper part opening and a lower part opening respectively at the upper part and the lower part to be vertically or obliquely to the stirring shaft 2 and to make the upper part opening 124 and the lower part opening 125 respectively to face the upper part 61 and the lower part 62 of a liquid in a stirring vessel on a fixture 11 mounted on a stirring shaft 2 and the stirring method is performed using the stirring blade.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stirring blade and a stirring method using the stirring blade. More specifically, the present invention relates to a mixing method of liquids having different specific gravities or liquids having different contents of dispersoids. The present invention relates to a stirring blade suitably used for mixing and the like and a stirring method using the stirring blade.

[0002] Mixtures of liquids having different specific gravities and difficult to mix with each other, and suspensions having different dispersoid contents are different from each other. Mechanical rotary agitation using various stirring blades even in the case of mixing of suspensions in which the content of dispersoids differs between the upper and lower parts, such as suspensions in which the content of dispersoids differs in the lower part However, in this case, there is a disadvantage that a large amount of power is required and the mixing ratio is not so large as expected for the large power.

In order to efficiently mix two or more types of liquids such as liquids having different specific gravities and suspensions having different upper and lower contents of dispersoids, the stirring blade and the stirring method have been intensively studied. As a result, the present invention has been achieved.

[0004]

That is, the first invention has an upper opening and a lower opening at an upper end and a lower end, respectively, and the upper opening and the lower opening have different sizes from each other. One that is equal or equal
Or a plurality of hollow pipes (hereinafter referred to as pipes) are vertically attached to a fitting attached to the stirring shaft or oblique to the stirring shaft, and the upper opening and the lower opening are each provided with a liquid in the stirring tank. Are arranged facing the upper part and the lower part of the pipe, and the liquid in the stirring tank is rotated by rotating the pipe around the stirring axis around the stirring axis so that one of the liquids in the stirring tank is transferred to one of the pipes. A stirring blade characterized in that the stirring blade is supplied to the inside of the tube from an opening, passes through the inside of the tube, and is discharged into the other liquid from the other opening of the tube.

Further, a second invention is a method for stirring and mixing a liquid to be mixed in a stirring tank, wherein the pipe of the stirring blade of the first invention is submerged in the liquid in the stirring tank, and the pipe of the stirring blade is The upper opening and the lower opening of the liquid facing the upper and lower portions of the liquid in the stirring tank, and the upper and lower portions of the liquid in the stirring tank are connected to each other by the pipe of the stirring blade. The pipe of the stirring blade is rotated around the stirring axis around the stirring axis, and the liquid in the stirring tank is stirred by the pipe of the stirring blade, and one liquid in the stirring tank is transferred to one side of the pipe. Through the opening of the tube, and through the inside of the tube to be discharged into the other liquid from the other opening of the tube,
This is a stirring method characterized by mixing an upper part and a lower part of a liquid in a stirring tank and mixing a liquid to be mixed.

[0006] The attachment is mounted on a stirring shaft, and one or more pipes are attached to the attachment. The attachment is a rod-like body, a square bar, a steel plate, a plate-like body having a plurality of holes (hereinafter, sometimes referred to as a porous plate-like body), or a plate-like body without a hole. It is preferable that the non-perforated plate and the perforated plate are attached to a stirring shaft so that the fluid resistance is minimized when rotated in a liquid. When the surface of the non-perforated plate is used vertically in the liquid (perpendicular to the plane of rotation of the stirring blade), it is preferable that the plate be narrow.

[0007] These rods, square bars, section steels, perforated plates and non-perforated plates are positioned approximately on the diameter of the plane of rotation. In addition, these rods, timbers,
Shaped steel, perforated plates and non-perforated plates are
There may be a plurality of pieces, but a plurality of pieces may be provided, and in the case of a plurality of pieces, they may be arranged on the same rotation plane or may be arranged on different rotation planes. These attachments are disposed substantially orthogonal to the stirring shaft. When there are a plurality of pipes, the interval between the pipes is appropriately selected depending on the viscosity of the liquid, the thickness of the pipes, the diameter of the tank body of the stirring tank, the angle between the rotating shaft and the pipes, and the like. You.

The pipe body may be a straight pipe as a whole, but the upper part may be a straight pipe part, the lower part may be a bent part, or the whole side surface may be substantially S-shaped. .
Furthermore, the upper portion of the straight pipe portion can be bent obliquely upward or obliquely downward, if desired, further in any direction such as toward the peripheral wall of the stirring tank, or toward the rotation axis, and is also preferable. .

The bent portion at the lower portion of the tube can be formed by bending the tube, but another tube is connected to the tip of the straight tube of the tube by, for example, welding and screwing. It can also be done. The bent portion of the pipe body is substantially 0 to 90 ° relative to the radial direction of the rotation plane on the rotation plane of the connection point at the connection point with the straight pipe section, that is, the radial direction of the rotation plane, or Formed along a circumference having a radius equal to the distance from the rotation axis to the joint, or along a tangential direction of the circumference, or the entire pipe is moved from the stirring shaft to the pipe. It can be curved along an arc of a circle having a radius substantially equal to the distance to the mounting position. Further, the entire tube is formed into a straight tube as a whole when viewed from above or below the rotation plane, and is disposed on the fixture substantially at 0 to 90 ° with respect to the radial direction of the rotation plane of the tube as described above. You can also.

[0010] The upper and lower ends of the tube are exposed to the liquid in the stirring tank as upper and lower openings, respectively. When a plurality of pipes are provided, the upper openings and the lower openings may be opened in substantially the same rotation plane or different rotation planes, respectively.

Although there is no particular limitation on the shape of the upper opening of the tubular body, usually, for example, a circular shape such as a circle, an ellipse and an ellipse and a multi-shape such as a triangle, square, rectangle, rhombus, hexagon and octagon are used. It is assumed to be a square. The upper opening may be closed with a perforated plate and, if desired, the upper opening may be formed in a funnel shape to form a shower spray type tube. It is also possible to form a spray-type tube by closing the upper end to form a blind tube and forming a number of holes as an upper opening at the upper end. The shape of the lower opening of the tubular body and the cross-sectional shape of the tubular body are also not particularly limited, but usually, for example, circles such as circles, ellipses, and ellipses, and triangles, squares, rectangles, rhombuses, hexagons, and the like. It is a polygon such as an octagon.

The shape of the upper opening and the lower opening of the tubular body may be the same as each other, or may be different. In addition, the liquid resistance can be reduced by making the thickness of the tip of one of the two openings of the tube, which is advanced at the time of stirring, thin and sharp.

In the tubular body, the opening areas of the upper opening and the lower opening may be substantially equal to each other or may be different, but the latter is preferable in practical use. In the latter case, the ratio of the two openings is arbitrarily selected depending on the type of the liquid to be mixed and the operating conditions. Also,
In the latter case, when used, any of the openings can be an opening for taking in the liquid (hereinafter sometimes referred to as a suction opening) or an opening for discharging the liquid (hereinafter sometimes referred to as a discharge opening). In practice, the larger opening is usually the suction opening. When the opening covered with the perforated plate and a large number of holes are formed in the tube, the area of the opening is the total area of the holes.

[0014] One or more pipes are disposed vertically on the fixture or obliquely with respect to the stirring shaft. In practice, the latter is preferred. The tube is usually arranged such that the suction opening is advanced when the stirring blade rotates. When a plurality of pipes are arranged obliquely with respect to the stirring shaft, the angles may be the same as each other or may be different from each other. When the pipe is inclined with respect to the stirring axis, the inclination angle of the pipe (the angle between the stirring axis and the pipe) differs depending on the viscosity of the liquid and the thickness of the pipe, and cannot be specified unconditionally. However, practically, for example, it is preferable to be about 15 to 75 °. In addition, the pipe body can be rotatably mounted on the mounting tool in order to arbitrarily adjust the respective inclination angles and angles of the rotation plane with respect to the radial direction.
The lengths, thicknesses, shapes, types, and the like of the plurality of pipes provided in the fixture are usually the same as each other, but may be different.

In the present invention, the tube is provided with a stirring shaft (rotating shaft).
The liquid in the stirred tank is moved in the tube according to Bernoulli's theorem and / or by centrifugal force.

The stirring blade of the present invention is used by being fixed to a stirring shaft by its attachment or slidably mounted. There is no particular limitation on the means for this fixing, and for example, any of fitting, screwing, welding, bonding and the like may be used. In addition, in order to slidably mount, for example, a groove or a projection or a ridge is provided on the surface of the stirring shaft along its long axis, and the mounting has a groove or a projection on the surface of the stirring shaft. Alternatively, it is possible to provide a protrusion or a ridge or a groove which is fitted and slid on the ridge.

Further, the fixture slidably mounted on the stirring shaft can be moved automatically or manually. For example, the tube body can be moved up and down in the liquid and stopped at a predetermined position in the liquid by remote control from outside the stirring tank. Alternatively, the tube may be manually moved up and down in the liquid by suspending the fixture with a wire communicating with the outside of the stirring tank and tensioning and relaxing the wire outside the stirring tank.

In the stirring method of the present invention, the rotation speed of the stirring blade can be appropriately selected depending on the type of the liquid to be mixed, the length and number of the tubes, and the like. Is preferably about 2.5 m / sec or more.

In the agitating blade of the present invention, a pipe disposed substantially at 90 ° to the radial direction of the rotation plane is provided with an upper opening and a lower opening at an upper portion and a lower portion of the liquid in the stirring tank, respectively. The upper and lower portions of the liquid in the stirring tank (hereinafter also referred to as the upper liquid and the lower liquid, respectively) are communicated by the pipe, and the stirring blade is rotated with the upper opening ahead. The upper liquid is lowered in the pipe and discharged from the lower opening into the lower liquid. On the other hand, if the stirring blade is rotated with the lower opening in advance, the lower liquid is raised in the tube and discharged from the upper opening into the upper liquid, and as a result, both liquids are mixed.
In addition, the tube disposed substantially at 0 ° to the radial direction of the rotation plane has an opening close to the center of the rotation plane and an opening on the circumferential side of the rotation plane, regardless of the rotation direction. They are a suction opening and a discharge opening, respectively.

The liquids to be mixed include, for example, liquids and suspensions composed of liquids having different specific gravities and being hardly mixed. The upper and lower portions of the liquid in the stirring tank are a liquid having a small specific gravity and a liquid having a large specific gravity, respectively, in the former, and a liquid having a small content of the dispersoid and a content of the dispersoid, respectively, in the latter. It is a large liquid. However, in the latter, the content of the dispersoid is different from each other.
Due to sedimentation of the dispersoid during stirring of one suspension in addition to the suspension of one or more suspensions, the content of the dispersoid is relatively low in the upper and lower parts due to the sedimentation of the dispersoid. And a liquid separated into a high suspension and the like.

[0021] The stirring blade of the present invention comprises a conventional turbine blade, propeller, angled flat blade, pitched flat blade,
It can be used in combination with stirring blades such as a flat blade disk turbine, a flat blade, a curved blade, a Faudler type blade and a bull margin type blade, and stirring means such as stirring by a jet jet and / or aeration stirring. Further, the fixture itself can also function as a stirring blade.

[0022]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
Although described more specifically, the present invention is not limited to these examples. 1 and 2 are a plan view and a side view, respectively, of a stirring blade of the present invention in which a pipe is disposed on a stirring shaft via a fixture at 90 ° to a radial direction of a rotation plane thereof. FIG. 3 is a longitudinal sectional view of the stirring tank in which the pipe of the stirring blade shown in FIGS. 1 and 2 is submerged in the liquid in the stirring tank. FIG. 4 is a plan view of various attachments of the stirring blade of the present invention. 5 to 8 show various embodiments of the tube. FIG. 9 is a plan view of the stirring blade of the present invention in which the tubular body is disposed on the stirring shaft via a fixture at 0 ° to the radial direction of the rotation plane thereof, and a sectional view taken along the line AA of the stirring blade. .

The stirring blade 1 comprises a fitting 11 and a tube 12. Thus, a narrow plate that is not perforated is used as the fixture 11. A total of six pipes 12 are provided on one side of the fixture 11. These tubes 12,1
,..., 12 are arranged on the stirring shaft 2 via the fixture 11 at an angle to the stirring shaft 2. The inclination angle of the tube body 12 is about 30 °.

The pipe 12 has an upper part formed as a straight pipe part 121,
The lower portion is a bent portion 122. In addition, this tube 12
The bent portion 122 is screwed at a joint point 123 at the lower end of the straight pipe portion 121. The straight pipe portion 121 is disposed 90 ° with respect to the radial direction on the rotation plane of the place where the straight pipe portion 121 is attached to the fixture 11, that is, perpendicular to the fixture 11. Bent part 122
Is approximately 90 ° with respect to the radial direction of the rotation plane of each junction 123, that is, the circumference whose radius is the distance from the center of the stirring shaft 2 (the center of the rotation plane) to the junction in this rotation plane. Are formed along the tangential direction of The bent portion 122 is substantially perpendicular to the stirring shaft 2 (substantially parallel to the rotation plane).

The ends of the straight pipe portion 121 and the bent portion 122 are opened into the liquid in the stirring tank.
And a lower opening 125. Top openings 124,124,…,
, 125 are opened on substantially the same rotation plane.
The shape of each of the upper openings 124, 124,..., 124 is a flat rectangle that is substantially parallel to the fixture 11, that is, substantially parallel to the rotation plane, and the lower openings 125, 125 thereof. ,..., 125 have substantially circular shapes.

The opening directions of the upper opening 124 and the lower opening 125 are obliquely upward and horizontal.
The area of the upper opening 124 is smaller than the area of the lower opening 125. The stirrer blade 1 is arranged in the liquid in the stirrer tank 3 by mounting the mounting tool 11 substantially perpendicular to the stirring shaft 2 at substantially its center. Thus, the upper opening 124 and the lower opening 125 face the upper liquid 61 and the lower liquid 62 in the stirring tank 3, respectively.

In the stirring tank 3, the stirring shaft 2 is made to pass through the center of the upper bottom plate of the cylindrical tank body 31, and this penetrating portion is sealed by a shaft seal 32. The lower end of the stirring shaft 2 is supported by a bearing 33 at the bottom of the tank body 31. A liquid inlet 34 and a liquid outlet 35 are provided on the lower bottom plate and the upper bottom plate of the tank body 31, respectively. The stirring shaft 2 is a motor at its upper end.
Connected to 4. Turbine blades 5 are arranged above and below the pipe 12 of the stirring blade 1 of the stirring shaft 2 respectively.

The upper liquid 61 in the stirring tank 3 is stirred by the stirring blade 1.
In order to mix the lower liquid 62 with the upper liquid 124, the upper opening 124 and the lower opening 125 of the pipe 12 of the stirring blade 1 face the upper liquid 61 and the lower liquid 62 in the stirring tank 3, respectively. 61 and the lower liquid 62 are brought into communication, and the stirring blade 1 is
By rotating 25 in advance—clockwise in FIG. 1—the lower liquid 62 is drawn into the tube 12 from the lower opening 125,
The inside of the tube 12 is raised and discharged from the upper opening 124 of the tube 12 into the upper liquid 61 in the stirring tank 3 and mixed with the upper liquid 61. The upper liquid 61 and the lower liquid 62 in the stirring tank 3 are further stirred by the pipe 12 of the stirring blade 1 and the turbine blade 5, respectively.

As another embodiment of the fixture 11, as shown in FIG.
Two perforated narrow plates or the like can be orthogonal to each other on the same plane of rotation, or can be a perforated disk as shown in FIG. 4b. The fixture shown here is mounted on the stirring shaft such that its plane is substantially parallel to the plane of rotation of the stirring blade.

FIGS. 5 to 7 show a spray shower type tube. FIG. 8 shows a spray tube.
5 to 8, a is a side view of the tube.
In FIG. 5, b is a plan view. 6 to 8, b is a bottom view.

The tube portion 126 of the tube 12 shown in FIG. 5 is curved upward when viewed from the side, and slightly curved when viewed from above. The upper end of the tube 126 is a funnel-shaped funnel 127. The upper opening 124 is rectangular,
It is covered with a perforated plate, and the shape of the lower opening 125 is a circle. Further, the opening directions of the upper opening 124 and the lower opening 125 are obliquely upward and horizontal, respectively.

The tube portion 126 of the tube body 12 shown in FIG. 6 has a vertically long S-shape as viewed from the side, and its upper end is bent obliquely downward, and is curved with a small curvature as viewed from below. Have been. The upper end of the tube portion 126 is formed in a funnel shape, and the funnel portion 1 is formed.
It is 27. The upper opening 124 is elliptical, covered with a perforated plate, and the shape of the lower opening 125 is circular. Further, the opening directions of the upper opening 124 and the lower opening 125 are obliquely downward and the horizontal direction, respectively.

The tube portion 126 of the tube body 12 shown in FIG. 7 has a vertically long S-shape when viewed from the side, and is slightly curved toward the stirring shaft 2 at the lower portion when viewed from below. . Also, tube 1
The upper end of 26 is a funnel-shaped funnel 127. The upper opening 124 is circular and covered with a perforated plate, and the shape of the lower opening 125 is circular. Further, the upper opening 124 and the lower opening 125
The opening directions are lateral and horizontal, respectively, away from the stirring shaft 2.

The tube portion 126 of the tube body 12 shown in FIG. 8 has a flat S-shape when viewed from the side, and its lower end portion is curved with a small curvature when viewed from below. The direction of this curve is
The direction is such that the lower opening 125 when attached to the attachment approaches the stirring shaft 2. The upper end of the tube 126 is closed to form a blind tube. A number of holes are formed in the lower surface of the upper end of the tube portion 126 to form an upper opening 124. The shape of the lower opening 125 is a circle. Further, the opening direction of the lower opening 125 is a horizontal direction. In the tubular body shown in FIGS. 5 to 8, the tubular body is made thicker at the lower part than at the upper part, and the opening area is made larger at the lower opening than at the upper opening.

FIG. 9 shows the stirring blade of the present invention in which the tube is mounted on the stirring shaft via a fixture at 0 ° to the radial direction of the plane of rotation. In FIG. 9, a is a plan view of the stirring blade, and b is a B-B of the stirring blade indicated by a.
It is sectional drawing of the B cutting part. In this stirring blade, the fitting
At the tip of 11, a pipe 12 is disposed obliquely at an inclination angle of about 45 °. Thus, the tube 12 is mounted substantially at 0 ° to the radial direction of the plane of rotation, that is, in the radial direction of the plane of rotation.

The upper opening 124 is more distant from the stirring shaft 2 than the lower opening 125. In use, the upper opening 124 and the lower opening 125 are a discharge opening and a suction opening, respectively. Thus, the four fittings 11, 11, 11, 11 in each of which the pipe 12 is disposed are disposed on the outer periphery of the center ring 7 at a central angle of 90 °. The tube 12 is a substantially straight cylinder,
Its upper end is bent substantially horizontally, and its tip is flattened horizontally. The shape of the lower opening 125 is a circle. The stirring ring 2 is inserted through the center ring 7. In this stirring blade, the upper opening 124 and the lower opening 125 of the tube 12 are a discharge opening and a suction opening, respectively, regardless of the rotation direction of the stirring blade.

[0037]

According to the present invention, two or more kinds of liquids having different specific gravities and liquids having different dispersoid contents can be efficiently mixed.

[Brief description of the drawings]

FIG. 1 shows a tube at 90 ° to the radial direction of its plane of rotation
It is a top view of the stirring blade of this invention arrange | positioned at the stirring shaft via the fixture.

FIG. 2 is a side view of the stirring blade of the present invention shown in FIG.

FIG. 3 is a longitudinal sectional view of a stirring tank in which the stirring blades shown in FIGS. 1 and 2 are disposed so as to be submerged in a liquid in the stirring tank.

FIG. 4 is a plan view of a fixture for a stirring blade according to the present invention.

FIG. 5 shows a spray shower tube of the stirring blade of the present invention, wherein a and b are a side view and a plan view, respectively.

FIG. 6 shows a spray shower tube of the stirring blade of the present invention, wherein a and b are a side view and a bottom view, respectively.

FIG. 7 shows a spray shower tube of the stirring blade of the present invention, wherein a and b are a side view and a bottom view, respectively.

FIG. 8 shows a spray-type tube of the stirring blade of the present invention, wherein a and b are a side view and a bottom view, respectively.

FIG. 9 shows a stirring blade of the present invention in which a pipe is disposed on a stirring shaft via a fixture at 0 ° to a radial direction of a plane of rotation thereof, and a is a plan view of the stirring blade. FIG. 2B is a cross-sectional view of the stirring blade indicated by a in FIG.

[Explanation of symbols]

 1 Stirrer blade 11 Fixture 12 Pipe 121 Straight pipe 122 Bent section 123 Joint 124 Upper opening 125 Lower opening 126 Pipe 127 Funnel 2 Stirring shaft 21 groove 3 Stirring tank 31 Tank body 32 Shaft seal 33 Bearing 34 Liquid Inlet 35 Liquid outlet 4 Motor 5 Turbine blade 61 Upper part of liquid in stirring tank (upper liquid in stirring tank) 62 Lower part of liquid in stirring tank (lower liquid in stirring tank) 7 Center ring

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4G035 AB38 AB52 4G078 AA01 AB20 BA05 CA01 CA05 CA12 CA17 DA30 DB10 DC01 DC06 EA20

Claims (6)

[Claims] 1. One or more hollow tubes having an upper opening and a lower opening at an upper end and a lower end, respectively, wherein the sizes of the upper opening and the lower opening are made different or equal to each other. The mounting device mounted on the stirring shaft is disposed vertically or obliquely with respect to the stirring shaft, with the upper opening and the lower opening facing the upper and lower portions of the liquid in the stirring tank, respectively. When the hollow tube is rotated around the stirring shaft around the stirring shaft, one liquid in the stirring tank is supplied into the hollow tube from one opening of the hollow tube, A stirring blade characterized by being discharged through the other opening of the hollow tube through the hollow tube into the other liquid. 2. The stirring blade according to claim 1, wherein the hollow tube is disposed substantially at 90 ° to the radial direction of the plane of rotation. 3. The stirring blade according to claim 1, wherein the hollow tube is disposed at substantially 0 ° with respect to the radial direction of the plane of rotation. 4. A method for stirring and mixing a liquid to be mixed in a stirring tank, wherein the hollow tubular body of the stirring blade according to claim 1 is submerged in the liquid in the stirring tank. With the upper opening and the lower opening of the hollow tube facing the upper and lower portions of the liquid in the stirring tank, respectively, the upper and lower portions of the liquid in the stirring tank are formed by the hollow tube of the stirring blade. And the hollow tubular body of the stirring blade is rotated around the stirring shaft around the stirring shaft, and the liquid in the stirring tank is stirred by the hollow tubular body of the stirring blade, and the stirring tank is stirred. One of the liquids is supplied into the hollow tube from one opening of the hollow tube, and is discharged from the other opening of the hollow tube into the other liquid through the hollow tube. Mixing the liquids in the stirring tank by mixing the upper and lower liquids and mixing the mixed liquid. . 5. The liquid to be mixed is a liquid composed of liquids having different specific gravities, and an upper part and a lower part of the liquid in the stirring tank are a liquid having a small specific gravity and a liquid having a large specific gravity, respectively.
The described stirring method. 6. The liquid to be mixed is a suspension having a solid content different from that of the liquid in the stirring tank.
The described stirring method.