JPH11300189A - Stirring apparatus for high-temperature melt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To homogenize a high-temp. melt and to suppress the generation of air bubbles, in a stirring apparatus in which an even pair of stirring units for stirring the high-temp. melt flowing in the right and left side walls of a flow passage mutually opposedly arranged symmetrically to the center line by specifying the spacings between stirring vanes, which are meshed with each other and rotate, and the right and left side walls. SOLUTION: The even pair of the stirring units 11 provided with the vane units 14u in plural stages at equal intervals in the vertical direction at a revolving shaft 13 are oppositely arranged symmetrically to the lateral central line C of the flow passage 12 where the high-temp. melt M flows. The stirring vanes 14 of the laterally adjacent stirring units 11 are rotated in the state of meshing with each other in reverse directions. The mounting phases of the stirring vanes 14 in the vertically adjacent vane units 14u are offset to maintain the uniformity of the stirring action in the respective depth direction positions of the flow passage 12. At this time, spacing (s) between the right and left side walls 12a, 12b of the flow passage 12 and the outer peripheral ends of the stirring vanes 14 are set at 0.04 to 0.1 times the distance W between the right and left side walls 12a and 12b, thereby, waving is suppressed and the intrusion of forth is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for agitating a high-temperature melt, such as molten glass, flowing in the left and right side walls of a flow path to homogenize and suppress the generation of bubbles.

[0002]

2. Description of the Related Art In order to stir a high-temperature molten material such as a molten glass, an even number of stirrer units are arranged symmetrically with respect to the left and right center lines of a flow path, and the stirrer blades of the right and left stirrer units are substantially aligned with each other. An apparatus for mixing a viscous material that rotates in a meshing state is known as Japanese Patent Application Laid-Open No. Sho 59-130524.

[0003]

As shown in the plan view of FIG. 6 (a) and the X-view of FIG. 6 (a) in FIG. The operation surface 2a and the rotation axis of the stirring unit 1 are inclined with an operation surface 2a inclined upward from the rotation direction front to the rotation direction rear with respect to the rotational tangential direction A, and an operation surface 2b inclined downward. The angle of intersection α with 3 is 45 °. The stirring blade 2 has a parallelogram-shaped end face as viewed from the arrow X (front view) as shown in FIG.

In the above mixing apparatus, the gap t between the left and right side walls 4a, 4a of the flow path 4 of the high-temperature melt and the outer peripheral end 2b of the stirring blade 2 is set to 1.27 to 2.54 cm. However, since the gap t is too small, the bricks forming the left and right side walls 4a, 4a are eroded by the flow of the high-temperature molten material, and the components of the eroded brick are mixed into the high-temperature molten material. However, there is a problem that the quality of the glass product manufactured from the product deteriorates, and the ripples due to the stirring are large and bubbles are easily mixed, so that the defective product generation rate due to the mixing of the bubbles is increased.

If the angle of intersection α of the stirring blades 2 is about 45 °, the function of pumping the high-temperature melt upward or downward cannot be obtained effectively, and it is not possible to sufficiently prevent entrapment of air bubbles in the high-temperature melt. There was a problem.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above problems of the viscous body mixing apparatus, to prevent the erosion of the bricks on the right and left side walls of the flow passage, to improve the quality of the glass product, and to improve the air bubbles. It is an object of the present invention to provide an apparatus for stirring a high-temperature melt, in which high-temperature melt is sufficiently homogenized while preventing mixing of high-temperature melt.

[0007]

In order to achieve the above object, a high-temperature melt stirring device according to the present invention comprises a stirring unit for stirring a high-temperature melt flowing in the left and right side walls of a flow path. In the high-temperature melt stirring device in which the stirring blades of the stirring units adjacent to the left and right rotate substantially in mesh with each other, the left and right side walls and the outer peripheral ends of the stirring blades are arranged symmetrically with respect to the left and right center lines. Is 0.04 to 0.1 times the distance between the left and right side walls.

According to the present invention, the clearance between the left and right side walls of the flow path and the outer peripheral end of the stirring blade is set to 0.04 times or more of the distance between the left and right side walls, so that the erosion of the left and right side walls is suppressed, and In addition to preventing the quality from being adversely affected, it is possible to reduce the ripples caused by the agitation and prevent air bubbles from being mixed. Further, since the gap between the left and right side walls of the flow path and the outer peripheral end of the stirring blade is set to 0.1 times or less of the distance between the left and right side walls, it is possible to prevent the foreign material in the high-temperature molten material from passing through, and to perform sufficient stirring. Homogenization can be maintained.

According to a preferred embodiment of the present invention, the stirring blade has a wedge shape having a working surface whose cross-sectional shape in the rotational tangential direction is inclined upward from the front in the rotation direction to the rear in the rotation direction. By forming the stirring blade in a wedge shape having an upwardly sloping working surface, an action of pumping the high-temperature molten material upward by the upwardly sloping working surface is obtained,
Since the wedge shape reduces the vortex at the back of the stirring blade,
The stirring force can be improved, and the generation of bubbles can be reduced.

According to a further preferred aspect of the present invention, the agitating blade is formed such that the intersection angle between its working surface and the rotation axis of the agitating unit is 55 to 80 °. By setting the intersection angle between the working surface of the stirring blade and the rotation axis of the stirring unit at 55 to 80 °, the action of upward pumping is further improved, and homogenization by sufficient stirring is achieved.

According to a further preferred aspect of the present invention, the stirring blade has a diameter of 40% or less of the distance between the left and right side walls. By limiting the size of the stirring blade to the above range, the ripple due to stirring can be reduced and the number of bubbles can be further reduced.

[0012]

1 to 5 show an embodiment of an apparatus for stirring a high-temperature melt according to the present invention. FIG. 1 is a front view showing a state where a stirring unit of the stirring device is arranged in a flow path, FIG. 2 is a plan view showing a state where a stirring unit of the stirring device is arranged in a flow path, and FIG. FIG. 4A shows the blades, FIG. 4A is an enlarged plan view, FIG. 4B is an enlarged plan view, FIG. 4 is a front view showing the whole of the stirring device, and FIG. It is a partially cutaway front view which shows a drive mechanism.

The high-temperature melt M is supplied to the right and left side walls 12a, 12a.
b, flows in the flow path 12 surrounded by the bottom wall 12c from the front surface to the rear surface in FIG. 1 and in the direction of arrow F in FIG.

On the rotating shaft 13, a blade unit 14U is provided.
A plurality of stages (four stages in the illustrated example) are provided at equal intervals in the vertical direction. Each blade unit 14U includes a plurality (four in the illustrated example) of stirring blades 1 attached so as to extend radially.
Consists of four. As shown in FIG. 2, the vertically adjacent blade units 14U shift the mounting phase of the stirring blade 14 with respect to the rotating shaft 13 by 45 ° from each other.

The stirring unit 11 having the blade unit 14U mounted on the rotating shaft 13 has an even number of pairs (four pairs in the illustrated example) symmetrically with respect to the left and right center line C of the flow path 12 in FIG.
Are arranged, and the stirring blades 14 of the stirring units 11 adjacent to each other on the left and right rotate in substantially mutually meshing states in directions opposite to each other. Here, the rotation in the substantially meshed state means that the stirring blades 1 of the stirring unit 11 adjacent to the left and right sides.
4 means that the phases rotate in the rotation direction so that the tips of the phases do not interfere with each other and are inserted between the blades of the other party. By rotating the even-number pairs of the stirring units 11 in a substantially meshing state as described above, the high-temperature molten material M between the stirring blades 14, 14 is formed.
Slip-through is effectively prevented.

Each rotating shaft 13 has a blade unit 14U.
Are arranged in a plurality of stages up and down so as to cope with the depth of the flow path 12, and the staggered blades 14 of the vertically adjacent blade units 14 </ b> U are shifted in the mounting phase so that the flow paths 12 are shifted.
The uniformity of the stirring action at each position in the depth direction is maintained.

As shown in FIG. 5, a drive gear 16 that meshes with the rotating shaft 13 is mounted on the rotating shaft 13, and a driven sprocket 17 is mounted on one rotating shaft 13 (the left rotating shaft 13 in the illustrated example). A drive chain 20 is wound around a drive sprocket 19 and a driven sprocket 17 attached to an electric support shaft of a motor 18.

As shown in FIG. 3A, the stirring blade 14
The working surface 14 whose cross-sectional shape in the rotational tangential direction A is inclined upward from the front in the rotation direction to the rear in the rotation direction.
a, the lower surface 14b is substantially horizontal, and the working surface 14a and the lower surface 14b are connected by a rear surface 14c. Thus, the stirring blade 14 is formed in a wedge shape by the working surface 14a and the lower surface 14b.

The direction of rotation of the stirring blade 14 is determined by the action surface 14a.
Is set so as to be on the front side with respect to the rotational tangential direction A of the stirring blade 14, so that the action surface 14a causes the arrow U
The upward pumping, modeled as, acts on the hot melt M. In this case, the working surface 14a and the stirring unit 11
Is preferably 55-80 °. Thereby, the pumping action and the stirring action by the pumping action can be more effectively obtained. Even if the intersection angle φ is larger or smaller than the above range, the stirring force decreases.

As described above, the stirring blades 14 of the stirring unit 11 adjacent to the left and right rotate in opposite directions to each other, but in any case, the working surface 14a is on the front side with respect to the rotational tangential direction A of the stirring blade 14. Therefore, the same upward pumping acts on the high-temperature melt M.

The greatest feature of the present invention is that a gap s between the left and right side walls 12 a and 12 b of the flow path 12 and the outer peripheral end of the stirring blade 14 is provided.
From 0.04 to the distance W between the left and right side walls 12a and 12b.
0.1 times. If the gap s is smaller than the above range, the bricks forming the left and right side walls 4a, 4a are eroded by the flow F of the high-temperature melt M and the stirring, and the components of the eroded brick are mixed into the high-temperature melt M. Then, the quality of products such as glass manufactured with the high-temperature molten material M deteriorates,
Ripple due to agitation is large and bubbles are easily mixed. Conversely, when the gap s is wider than the above range, the amount of the high-temperature molten material M passing between the outer peripheral end of the stirring blade 14 and the left and right side walls 12a, 12b increases, and the stirring action of the stirring blade 14 decreases, The homogeneity of the hot melt is reduced.

It is preferable that the diameter L of the stirring blade 14 is 40% or less of the distance W between the left and right side walls 12a and 12b. If the diameter L of the stirring blade 14 is larger than the above, bubbles are likely to be mixed due to the waving. Furthermore,
It is preferable that the overlap OL of the stirring blades 14 of the adjacent stirring units 11 is about 20% of the diameter L of the stirring blades 14.

Therefore, according to this stirring device, when the high-temperature molten material M such as a molten glass is going to pass through the stirring device through the flow path 12, the pumping surface is upwardly pumped by the working surface 14a of the rotating stirring blade 14. Give action,
Thereby, the hot melt M can be effectively stirred and homogenized.

In this case, the left and right side walls 12a, 1
The gap s between the outer peripheral end of the stirring blade 14 and the outer peripheral end of the stirring blade
By setting the distance W between 2a and 12b to 0.04 to 0.1 times, the waving is suppressed without preventing the mixing of bubbles without weakening the stirring effect, and the erosion of the left and right side walls 12a and 12b is reduced. can do.

The agitating blade 14 has a wedge shape as described above, and the intersection angle φ between the working surface 14a and the axis of the rotating shaft 13 of the agitating unit 11 is 55 to 80 °, so that the agitating effect is obtained. And mixing of bubbles due to undulation can be reduced.

As a result, it is possible to obtain a high-temperature molten material M, such as a high-quality molten glass, which is sufficiently homogenized and contains little bubbles, and reduces the quality and yield of glass products produced from the high-temperature molten material. Can be improved.

[0027]

EXAMPLES Example 1, Comparative Examples 1, 2, and 3 A model having the same structure as the stirring device shown in FIGS. 1 to 5 and having a size of 1/4 was prepared and installed in a channel formed by a transparent water tank. Simultaneously, a simulation test regarding the stirring action was performed by flowing a liquid of polybutene having the same flow characteristics as the molten glass.

That is, while the polybutene liquid was allowed to flow through the above-mentioned flow channel, a tracer liquid (ink) was dropped from the upstream side of the model of the stirrer, and the stirring effect on the surface layer, middle layer and bottom layer of the flow channel was observed. In the evaluation, ◎: 100% agitation, no tracer after stirring; 攪拌: 100% agitation, but tracer after stirring;
The test was performed on the basis of 100% slip through.

As a sample, a gap s between the left and right side walls 12 a and 12 b of the flow channel 12 and the outer peripheral end of the stirring blade 14 is used.
Is set to 0.05 times the distance W between the left and right side walls 12a and 12b (Example 1). The shape of the blade is not a wedge-shaped cross-section but a parallelogram in cross-section as shown in FIG.
Is set to 0.05 times the distance W (Comparative Example 1), the shape of the blade is a parallelogram in cross section, and the gap s is
Four types were prepared: 0.02 times (Comparative Example 2), the shape of the blade was a parallelogram in cross section, and the gap s was 0.12 times the distance W (Comparative Example 3). did. Table 1 shows the results.

[0030]

[Table 1]

Example 2, Comparative Example 4 A molten glass was treated using the stirring apparatus according to the present invention shown in FIGS. 1 to 5 to produce a cathode ray tube (Example 2). On the other hand, a cathode ray tube was manufactured in the same manner using the conventional stirrer shown in FIG. 6 (Comparative Example 4). Then, when the defective product occurrence rate due to the mixing of bubbles was measured, the defective product occurrence rate of Example 2 could be reduced to half that of Comparative Example 4.

[0032]

As described above, according to the present invention,
Since the gap between the left and right side walls of the flow path and the outer peripheral end of the stirring blade is set to 0.04 times or more of the distance between the right and left side walls, erosion of the left and right side walls is suppressed, and the quality of the glass product is not adversely affected. In addition, ripples due to stirring can be reduced to prevent air bubbles from being mixed. Further, the gap between the left and right side walls of the flow path and the outer peripheral end of the stirring blade is set to a distance of 0.1 between the left and right side walls.
Because it was less than twice, to prevent the high-temperature molten material from passing through,
Homogenization with sufficient agitation can be maintained.

[Brief description of the drawings]

FIG. 1 is a front view showing a state in which a stirring unit of a stirring device according to an embodiment of the present invention is arranged in a flow path.

FIG. 2 is a plan view showing a state where a stirring unit of the stirring device is arranged in a flow path.

3A and 3B show stirring blades of the stirring apparatus, wherein FIG. 3A is a view taken along the line XX in FIG. 2 and FIG. 3B is an enlarged plan view.

FIG. 4 is a front view showing the whole of the stirring device.

FIG. 5 is a partially cutaway front view showing a drive mechanism of the stirring device.

6A and 6B show an example of a conventional stirring device, in which FIG. 6A is a plan view, and FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Stirring unit 12 Flow path 12a, 12b Left and right side wall 13 Rotation axis 14 Stirring blade 14a Working surface M Hot melt W Width (distance) φ Intersection angle

Claims (4)

[Claims] 1. A stirrer unit for stirring a high-temperature melt flowing in left and right side walls of a flow path, an even number of pairs arranged symmetrically with respect to a left and right center line of the flow path, and a stirring unit adjacent to the left and right sides. In the high-temperature melt stirring device in which the stirring blades rotate substantially meshing with each other, the gap between the left and right side walls and the outer peripheral end of the stirring blades is set to 0.04 to
A stirrer for a high-temperature melt, characterized in that the ratio is 0.1 times. 2. The high-temperature melt stirring apparatus according to claim 1, wherein the stirring blade has a wedge-shaped cross section in a rotational tangential direction having a working surface inclined upward from the front in the rotation direction to the rear in the rotation direction. 3. The high-temperature melt stirring device according to claim 1, wherein the stirring blade has an intersection angle between the working surface of the stirring blade and the rotation axis of the stirring unit at 55 to 80 °. 4. The stirring blade is 40% of the distance between the left and right side walls.
The high-temperature melt stirring device according to any one of claims 1 to 3, which has the following diameter.