JP2017119599A - Molten glass stirrer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molten glass stirrer capable of sufficiently agitating to homogenize a molten glass of a high viscosity of 500 [Pa s] or more.SOLUTION: A molten glass stirrer 101 comprises a main shaft 111 and rod-like blades 112, 112 ... of plural stages fixed orthogonally of the main shaft 111. Two arbitrary rod-like blades 112, 112 adjacent to each other are arranged to cross each other at a unit phase angle Δθ satisfying Formula 1, as seen in the axial direction of the main shaft 111. (Mathematic Formula 1)Δθ=(Δh/d)×θ(Here: Δh is a unit inter-axial distance in the axial direction of the main shaft 111 between the mutually adjacent rod-like blades 112, 112; d is the whole length of the rod-like blades 112; and θ is a reference phase angle between the two rod-like blades 112, 112 in the axial direction of the main shaft 111 or the reference phase angle between the two rod-like blades, and is 50° or more and 170° or less.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a molten glass stirrer technique for stirring and homogenizing molten glass, and more particularly to a molten glass stirrer technique including a plurality of rod-shaped blades.

In general, in the manufacturing process of glass products, the prepared and mixed glass raw materials are melted, and the components are homogenized by stirring the molten glass (molten glass) and then molded. Glass products.
Here, in order to obtain a high-quality glass product free from inhomogeneous defects (streaks) and bubbles, it is important to sufficiently homogenize by stirring the molten glass.
In particular, glass products such as glass plates for display, glass fibers, medical glasses, or glass for optical components require high quality, so high-quality molten glass is stably supplied over a long period of time. This is very important.
Thus, as a stirring device for the purpose of homogenizing the components of the molten glass, devices having various configurations have been proposed.
For example, the stirrer provided in the stirrer is an important component that is in direct contact with the molten glass, but the stirrer blade of the stirrer has a shape such as a crank type, a spiral type, a propeller type, or a helical ribbon type. Alternatively, a shape obtained by combining these, or a shape obtained by significantly deforming these shapes and attaching a plurality to the rotating shaft has been proposed.

By the way, when stirring molten glass, it is necessary to stir more strongly in order to increase homogenization of the components of the molten glass, increasing the number of stirring blades of the stirrer, increasing the shape, or rotating the stirring of the stirrer Measures such as increasing the number were taken.
However, such countermeasures increase the torque applied to the stirrer, which causes deformation and breakage of the stirrer.

Therefore, for example, “Patent Document 1” discloses a technique for solving such a problem.
That is, in “Patent Document 1”, a glass production comprising a stirrer shaft and a plurality of stirrer stirrer blades (stirrer blades, hereinafter referred to as “bar-shaped blades”) fixed through the stirrer shaft. A stirrer for the above, wherein the rod-shaped wing includes a cylinder formed by seam welding two opposite sides of a flat plate made of reinforced platinum or reinforced platinum alloy in which metal oxide is dispersed using platinum or a platinum alloy as a matrix, and the cylinder A hollow cylindrical body made of a disk made of the same material and welded to both ends of the rod, and the rod-shaped blade has the stirrer shaft so that a weld line by the seam welding intersects a central axis of the stirrer shaft. And the rod-like wings are fixed to the stirrer shaft. In the surface tissue, and having a core layer exhibiting dispersion tissue that is not affected by heat, the technique according to the stirrer for glass manufacture is disclosed by sticking.

JP 2014-148453 A

According to the glass production stirrer in “Patent Document 1”, it seems that the molten glass can always be vigorously stirred without causing deformation or breakage of itself.
However, in “Patent Document 1”, for example, when stirring a high-viscosity molten glass having a viscosity of 500 [Pa · s] or more, sufficient stirring is performed under a low rotation speed stirring condition in which the stirrer is not easily deformed or damaged. There were cases where it could not be implemented.

  The present invention has been made in view of the current problems described above. For example, even a high-viscosity molten glass having a viscosity of 500 [Pa · s] or more should be sufficiently stirred and homogenized. It is an object of the present invention to provide a stirrer for molten glass that can be used.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

That is, the molten glass stirrer according to the present invention is a molten glass stirrer having a main shaft and a plurality of stages of rod-shaped blades fixed perpendicularly to the main shaft, and any two adjacent stirrers. The rod-shaped blades are arranged so as to intersect each other with a unit phase angle Δθ satisfying Formula 1 when viewed from the axial direction of the main shaft.
(Formula 1)
Δθ = (Δh / d) × θ
(Where Δh is the distance between the unit axes in the axial direction of the main shaft between the adjacent rod-shaped wings, d is the total length of the rod-shaped wings, and θ is the total length d of the inter-axis distance in the axial direction of the main shaft. (The reference phase angle between the rod-shaped blades is 50 ° or more and 170 ° or less.)
In addition, when the full length of adjacent rod-shaped wing | blades is not equal, let the average value of the said 2 rod-shaped wing | blade be d.

  According to the molten glass stirrer of the present invention having such a configuration, the present invention has been found based on a reference phase angle θ of 50 ° or more and 170 ° or less that allows the molten glass to be most effectively stirred. In addition, since it is configured with a unit phase angle Δθ, for example, even a high-viscosity molten glass having a viscosity of 500 [Pa · s] or more can be sufficiently stirred and homogenized. Molten glass can be supplied stably over a long period of time.

  In the molten glass stirrer according to the present invention, in the mathematical formula 1, the reference phase angle θ is a phase angle between two rod-shaped blades in which the distance between the axes in the axial direction of the main shaft is the total length d. Thus, it is preferably 70 ° or more and 150 ° or less.

  By having such a configuration, according to the stirrer for molten glass of the present invention, for example, even a molten glass having a high viscosity of 500 [Pa · s] or more can be sufficiently stirred and homogenized. And high-quality molten glass can be stably supplied over a long period of time.

  In the molten glass stirrer according to the present invention, it is preferable that the rod-shaped blade is fixed in a state of being penetrated with respect to the main shaft.

  By having such a configuration, according to the stirrer for molten glass of the present invention, it is possible to sufficiently ensure the strength of the joint portion between the main shaft and the rod-shaped blade.

As effects of the present invention, the following effects can be obtained.
That is, according to the stirrer for molten glass according to the present invention, even a molten glass having a high viscosity of, for example, 500 [Pa · s] or more can be sufficiently stirred and homogenized.

In the molten glass stirrer which concerns on this invention, it is a model figure for demonstrating the relationship between a reference | standard phase angle and a unit phase angle, (a) is the front view, (b) is the top view. It is the figure which showed the whole structure of the stirrer for molten glass which concerns on 1st embodiment of this invention, Comprising: (a) is the perspective view, (b) is the front view, (c) is the top view. It is the figure which showed the whole structure of the stirrer for molten glasses which concerns on 2nd embodiment of this invention, Comprising: (a) is the perspective view, (b) is the front view. Similarly, it is the figure which showed the whole structure of the stirrer for molten glass which concerns on 2nd embodiment, Comprising: (a) is the top view, (b) was seen from the direction of arrow A of FIG.3 (b). It is sectional drawing, Comprising: The cross-sectional top view except the rod-shaped wing | blade 212F located in the lowest end side and the rod-shaped wing | blade 212B adjacent to the said rod-shaped wing | blade 212F, (c) was seen from the direction of arrow B of FIG.3 (b). FIG. It is the figure which showed the whole structure of the stirrer for molten glass which concerns on 3rd embodiment of this invention, Comprising: (a) is the perspective view, (b) is the front view, (c) is the top view. The perspective view which showed the whole structure of the stirrer for molten glass which concerns on 4th embodiment of this invention. The conceptual diagram which showed the structure of the model assumed when performing the numerical analysis for verifying the effectiveness of the stirrer for molten glass in this embodiment. It is the figure which showed the result of the numerical analysis for verifying the effectiveness of the stirrer for molten glass in this embodiment, Comprising: The movement amount of a molten glass and unit phase angle for every full length of three types of rod-shaped blades The graph which showed each. It is the figure which showed the result of the numerical analysis for verifying the effectiveness of the stirrer for molten glass, and shows the relation between the amount of movement of the molten glass and the unit phase angle for each number of three kinds of rod-shaped blades. Graph. Front sectional drawing which showed the structure of the experimental model constructed | assembled when performing the model experiment for verifying the effectiveness of the stirrer for molten glass in this embodiment. It is a figure showing the result of a model experiment for verifying the effectiveness of the stirrer for molten glass in the present embodiment, the contrast of the load change of the molten glass for each number of three types of rod-shaped blade, the unit phase angle and The graph which showed the relationship of each.

  Next, an embodiment for embodying the present invention will be described with reference to FIGS.

[Overview]
First, an outline of a molten glass stirrer (hereinafter simply referred to as “stirrer”) 1 embodying the present invention will be described with reference to FIG.

  The stirrer 1 in this embodiment is one of the components provided in the stirring device that can stir even if it is a molten glass having a high viscosity of, for example, 500 [Pa · s] or more. It is an important component that makes direct contact.

Here, as a stirrer for agitating high-viscosity molten glass, there has conventionally been proposed a configuration in which a main shaft and a stirrer composed of a plurality of stages of rod-shaped blades fixed through the main shaft are combined. ing.
However, even with a stirrer having such a configuration, when stirring high-viscosity molten glass having a viscosity of 500 [Pa · s] or more, it is sufficient under stirring conditions at low rotational speeds where the stirrer is unlikely to deform or break. In some cases, stirring could not be performed.

  By the way, generally, the rotational energy of the stirrer can be decomposed into “energy used when rotating the molten glass” and “energy used when mixing the molten glass”. If the ratio of “energy used when mixing molten glass” can be increased by making the outer shape of the glass into an optimal shape, the molten glass is stirred under stirring conditions that do not cause deformation or breakage. It is possible to achieve the homogenization of the molten glass most effectively when performing the above.

  Based on the above idea, the present inventor is conducting a detailed examination on the outer shape of the stirrer 1 for molten glass having a plurality of rod-shaped blades 12, 12... As shown in FIG. As a result of intensive studies with various changes in the mounting angle difference (phase angle) of the rod-shaped blades 12, the two rod-shaped blades 12, which have a distance L between the axes equivalent to the total length d of the rod-shaped blades 12, are separated. 12 (for example, the rod-shaped blade 12A and the rod-shaped blade 12C in FIG. 1) in a range corresponding to a phase angle (hereinafter referred to as “reference phase angle”) of 50 [°] or more and 170 [°] or less. The inventors have found that the molten glass can be stirred most effectively, and have reached the present invention.

Specifically, as shown in FIG. 1B, in the stirrer 1, any two rod-shaped blades 12 and 12 (for example, the rod-shaped blade 12A and the rod-shaped blade 12B in FIG. 1) adjacent to each other in the axial direction of the main shaft 11 are used. ) (Hereinafter referred to as “unit phase angle”) is Δθ, the unit phase angle Δθ is determined by the following formula (1).
That is, the unit phase angle Δθ is
Δθ = (Δh / d) × θ (1)
Determined by
However, as shown in FIG. 1A, Δh represents a distance between the shafts 12A and 12B adjacent to each other in the axial direction of the main shaft 11 (hereinafter referred to as “unit-axis distance”). .
D represents the total length of the rod-shaped wing 12.
Further, as shown in FIG. 1B, θ is a reference phase between the rod-shaped wing 12A and a virtual rod-shaped wing 12C spaced apart with an inter-axis distance L equal to the total length d of the rod-shaped wing 12A. It represents an angle and is set within a range of 50 ° to 170 °.

  For example, when the full lengths of the adjacent rod-shaped wings 12A and the rod-shaped wings 12B are not equal to each other, the total length d is defined by the average value of the two rod-shaped wings 12A and 12B.

[Stirrer 101 (first embodiment)]
Next, the structure of the stirrer 101 in 1st embodiment is demonstrated using FIG.
The stirrer 101 of this embodiment is mainly comprised by the main axis | shaft 111 and several rod-shaped wing | blade 112 * 112 ... etc., as shown to Fig.2 (a).

The main shaft 111 is made of a cylindrical member, and a plurality of through holes 111a, 111a,.
The plurality of through-holes 111a, 111a,... Are formed in a direction orthogonal to the axis of the main shaft 111, and are equidistant from each other in the axial direction. The hearts are arranged in a spiral with equiangular phase differences.

  A plurality of rod-shaped wings 112, 112, which will be described later, are respectively provided through the through holes 111a, 111a,.

  The main shaft 111 is made of the same material as the rod-shaped blade 112, that is, platinum or a platinum alloy described later. However, it is more preferable to use the reinforced platinum or the reinforced platinum alloy shown in the aforementioned “Patent Document 1”.

Next, the rod-shaped wing 112 will be described.
The rod-shaped wing 112 has a hollow cylindrical structure, for example.
Specifically, the rod-shaped wing 112 is a cylindrical portion 112a formed by winding a flat plate member made of platinum or a platinum alloy and seam-welding two opposing sides, and a cylinder made of a material equivalent to the cylindrical portion 112a. It is comprised by the disc part 112b * 112b fixed by the perimeter welding at the both ends of the part 112a.

The configuration of the rod-shaped wing 112 is not limited to that of the present embodiment, and for example, a solid round bar member or the like may be used.
However, it is more preferable to use a hollow cylindrical structure because the material cost and weight can be reduced.

The plurality of rod-shaped wings 112, 112... Having such a configuration are penetrated in the orthogonal direction to the main shaft 111 through the through holes 111a, 111a, and the outer peripheral surface of the main shaft 111 at the center in the longitudinal direction. It is fixed to.
As a result, each of the plurality of rod-shaped blades 112, 112... Is orthogonal to the main shaft 111 and is equally spaced along the axial direction of the main shaft 111 and adjacent to each other in the axial direction. Since they have equiangular phase differences, they are arranged so that the trajectory of the end portion is spiral.

  Note that the configuration of the rod-shaped wing 112 is not limited to that of the present embodiment. For example, instead of one rod-shaped wing 112, two rod-shaped wings 112 and 112 arranged coaxially with each other. It is good also as making it fix to the main axis | shaft 111 as 1 set.

Here, as shown in FIGS. 2B and 2C, in the present embodiment, any two rod-like wings 112 and 112 (for example, the rod-like shape in FIG. 2) adjacent in the axial direction of the main shaft 111 are used. If the unit phase angle between the blade 112A and the rod-shaped blade 112B) is Δθa, the unit phase angle Δθa is determined by the following equation (2) based on the above equation (1).
That is, the unit phase angle Δθa is
Δθa = (Δha / da) × θa (2)
Determined by
However, as shown in FIG. 2 (b), Δha is the distance between the unit axes between any two rod-shaped wings 112 and 112 (for example, the rod-shaped wing 112A and the rod-shaped wing 112B) adjacent to each other in the axial direction of the main shaft 111. Represent.
Da represents the total length of the rod-shaped wing 112. In the present embodiment, the full length da of the rod-shaped blade 112 coincides with the entire length of the stirring body (the inter-axis distance between the rod-shaped blades 112 and 112 that are farthest from each other) La.
Further, as shown in FIG. 2 (c), θa is an axis equivalent to the full length da of the rod-shaped wing 112A in the plurality of rod-shaped wings 112, 112... Spirally arranged along the axial direction of the main shaft 111. Although the reference phase angle is between the virtual rod-shaped wings that are spaced apart from the rod-shaped wings 112A, in this embodiment, the stirring member full length La matches the full length da of the rod-shaped wings 112A. The phase angle between the blade 112A and the rod-shaped blade 112C matches the reference phase angle.

  In the present embodiment, the reference phase angle θa is preferably set to be 50 [°] or more and 170 [°] or less, and is preferably 70 [°] or more and 150 [°] or less. More preferably, it is set.

  Further, the unit phase angle Δθa is not limited to being set in one direction and at an equal angle with respect to all the rod-shaped wings 112, 112,. For example, as shown in a second embodiment and a third embodiment to be described later, each of the two adjacent rod-shaped wings 112, 112,.

In the present embodiment, “adhesion” refers to a welded state (that is, welding) that seals at least the gap between the two members at the joint between the main shaft 111 and the rod-shaped blade 112 (the root portion of the rod-shaped blade 112). This means that the heat-affected zone is not formed over the entire thickness of the rod-shaped blade 112 but is formed only on the substantially surface.
Even in such a welded state, the strength of the joint between the main shaft 111 and the rod-shaped blade 112 is sufficiently secured, and it is possible to eliminate the erosion of the molten glass.

  In addition, about the full length of each rod-shaped wing | blade 112, it is preferable to set it as 150 [%]-400 [%] of the diameter of the main axis | shaft 111, and it can set up comparatively freely.

As shown in FIG. 2A, the stirrer 101 configured as described above has a plurality of rod-shaped wings 112, 112... Positioned on the lower end side of the main shaft 111 while the axial direction of the main shaft 111 is the vertical direction. It is arranged in this way.
Further, a drive mechanism unit (not shown) is connected to the upper end portion of the main shaft 111, and the stirrer 101 is configured to be rotationally driven around the axis of the main shaft 111 by the drive mechanism unit.

  For example, when a high-viscosity molten glass having a viscosity of 500 [Pa · s] or more is stirred using the stirring device, the stirrer 101 is buried in the molten glass and is rotationally driven by the drive mechanism unit.

As a result, in the molten glass, for example, a flow that approximates a convection state generated by a spiral plate-like blade (hereinafter referred to as “molten glass flow”) includes a plurality of rod-shaped blades 112, 112. Occur through.
More specifically, the molten glass flow is generated as, for example, a spiral flow that flows downward along the wall surface of the molten glass tank after the molten glass positioned at the bottom is once wound up to the upper surface.

  By generating such a molten glass flow, according to the stirrer 101 in the present embodiment, the molten glass can be flowed from the bottom to the top of the molten glass tank and to the bottom. Even if it is a molten glass having a high viscosity of s] or more, a very good stirring state can be realized.

Further, according to the stirrer 101 in the present embodiment, a plurality of rod-shaped wings 112, 112... Are arranged at a predetermined angle so that the locus of the end portion is spiral, for example, the rod-shaped wing at 90 degrees. Compared with a stirrer in which is placed, a high stirring state can be realized.
This is because in the high-viscosity molten glass, the molten glass partially moves upward when the molten glass passes between the rod-shaped blades 112 and 112 adjacent to each other.

Here, it is considered that the molten glass flow is sheared at a location where the molten glass passes and a flow in a direction different from the spiral flow described above is created.
And it is thought that a low load and an effective stirring state are implement | achieved by such extreme shear of a molten glass flow.

[Stirrer 201 (second embodiment)]
Next, the structure of the stirrer 201 in 2nd embodiment is demonstrated using FIG. 3 and FIG.
The stirrer 201 of this embodiment has a configuration substantially equivalent to that of the stirrer 101 of the first embodiment. On the other hand, as will be described later, the unit phase angle Δθb at any position can be changed without changing the unit axis distance Δhb. This is different from the stirrer 101 of the first embodiment.
Therefore, in the following description, the difference from the stirrer 101 in the first embodiment is mainly described, and the description of the equivalent configuration with the stirrer 101 is omitted.

As shown in FIG. 3A, the stirrer 201 is mainly composed of a main shaft 211, a plurality of rod-shaped wings 212, 212.
The plurality of rod-shaped wings 212, 212,... Penetrate through the main shaft 211 through the through holes 211a, 211a, etc. in the orthogonal direction, and respectively penetrate into the outer peripheral surface of the main shaft 211 at the center in the longitudinal direction. While being fixed.
As a result, the plurality of rod-shaped wings 212, 212... Are orthogonal to the main shaft 211, equidistantly along the axial direction of the main shaft 211, and every two rod-shaped wings 212, 212 adjacent to each other in the axial direction. Since it has a phase difference, it arrange | positions so that the locus | trajectory of an edge part may become a spiral shape.

  By the way, in this embodiment, for example, with respect to a total of seven rod-shaped blades 212, 212..., Four rod-shaped blades 212, 212, 212, 212 from the top and three rod-shaped blades 212, 212 from the bottom. The reference phase angle θb is different between 212 and 212.

That is, as shown in FIGS. 3B and 4, in this embodiment, when the unit phase angle between any two rod-shaped blades 212 and 212 adjacent to each other in the axial direction of the main shaft 211 is Δθb, Based on the mathematical formula (1), the unit phase angle Δθb is determined by the following mathematical formula (3).
That is, the unit phase angle Δθb is
Δθb = (Δhb / db) × θb (3)
Determined by
However, as shown in FIG. 3B, Δhb represents the unit-axis distance between any two rod-shaped blades 212 and 212 adjacent in the axial direction of the main shaft 211.
Db represents the total length of the rod-shaped wing 212.

In the stirrer 201 in this embodiment, two types of unit phase angles, that is, Δθb1 and Δθb2 are used without changing the unit axis distance Δhb. The unit phase angle Δθb at the position is different.
That is, in the present embodiment, the reference phase angle θb is changed at an arbitrary position.

Specifically, for example, as shown in FIG. 4C, a rod-shaped wing 212A located third from the lowermost end in the axial direction of the main shaft 211, and a rod-shaped wing 212B adjacent to the lower side of the rod-shaped wing 212A. The unit phase angle Δθb1 between them is obtained by Equation (3) based on the reference phase angle θb1 (Δθb1 = (Δhb / db) × θb1).
At this time, as shown in FIG. 3B, the reference phase angle θb1 is equal to the rod-shaped blade 212A and the virtual rod-shaped blade 212C that is located below the rod-shaped blade 212A by an inter-axis distance per full length db. As the reference phase angle between.

On the other hand, as shown in FIG. 4B, for example, the unit phase angle Δθb2 between the rod-shaped wing 212A and the rod-shaped wing 212D adjacent to the upper side of the rod-shaped wing 212A is based on the reference phase angle θb2. ) (Δθb2 = (Δhb / db) × θb2).
At this time, as shown in FIG. 3B, the reference phase angle θb2 is equal to the rod-shaped blade 212A, and the virtual rod-shaped blade 212E that is located above the rod-shaped blade 212A by an inter-axis distance per full length db. As the reference phase angle between.

  Since these reference phase angles θb1 and θb2 are set to be different from each other, the unit phase angles Δθb1 and Δθb2 are also different from each other as shown in FIG.

  As described above, in the present embodiment, the reference phase angle θb (θb1,...) Between the four rod-shaped blades 212, 212, 212, 212 from the top and the three rod-shaped blades 212, 212, 212 from the bottom. θb2) are different from each other, and the reference phase angle θb is not related to the entire length of the stirring body (distance between the axis between the lowermost rod wing 212F and the uppermost rod wing 212G) Lb. Can show.

  In the present embodiment, the reference phase angles θb1 and θb2 are preferably set to be 50 [°] or more and 170 [°] or less, and are 70 [°] or more and 150 [°] or less. More preferably, it is set as follows.

  Thus, unlike the stirrer 101 of the first embodiment, the stirrer 201 in the present embodiment has a unit phase angle Δθb (for example, Δθb1) at an arbitrary position at another position without changing the unit axis distance Δhb. Is different from the unit phase angle Δθb (for example, Δθb2).

  Even with the stirrer 201 having such a configuration, as in the stirrer 101 of the first embodiment, a very good stirring state is achieved for molten glass having a high viscosity of, for example, 500 [Pa · s] or more. can do.

[Stirrer 301 (third embodiment)]
Next, the structure of the stirrer 301 in 3rd embodiment is demonstrated using FIG.
The stirrer 301 of the present embodiment has a configuration substantially equivalent to that of the stirrer 101 of the first embodiment, while changing the unit axis distance Δhc at any position without changing the reference phase angle θc. The difference from the stirrer 101 of the first embodiment is that the angle Δθc is changed.
Therefore, in the following description, differences from the stirrer 101 in the first embodiment are mainly described, and description of an equivalent configuration to the stirrer 101 is omitted.

As shown in FIG. 5A, the stirrer 301 is mainly composed of a main shaft 311 and a plurality of rod-shaped blades 312, 312,.
The plurality of rod-shaped wings 312, 312,... Penetrate through the main shaft 311 through the through-holes 311 a, 311 a, and so on, and penetrate into the outer peripheral surface of the main shaft 311 at the center in the longitudinal direction. While being fixed.
As a result, the plurality of rod-shaped blades 312, 312... Are orthogonal to the main shaft 311, and are equally spaced along the axial direction of the main shaft 311, and are adjacent to each other in the axial direction. Since it has a phase difference, it arrange | positions so that the locus | trajectory of an edge part may become a spiral shape.

Here, as shown in FIGS. 5B and 5C, in this embodiment, when the unit phase angle between the two rod-shaped blades 312 and 312 adjacent in the axial direction of the main shaft 311 is Δθc. Based on the above formula (1), the unit phase angle Δθc is determined by the following formula (4).
That is, the unit phase angle Δθc is
Δθc = (Δhc / dc) × θc (4)
Determined by
However, as shown in FIG. 5B, Δhc represents a unit-axis distance between any two rod-shaped blades 312 and 312 adjacent in the axial direction of the main shaft 311.
Further, dc represents the entire length of the rod-shaped wing 312.
Further, as in the case of the second embodiment, θc has an inter-axis distance of the full length dc in the plurality of rod-shaped blades 312, 312... Spirally arranged along the axial direction of the main shaft 311. The reference phase angle between the two rod-shaped blades 312 and 312 separated from each other is shown, but the illustration is omitted.

In the stirrer 301 in the present embodiment, the unit phase angle Δθc at an arbitrary position is changed to the unit phase angle Δθc at another position by changing the unit axis distance Δhc without changing the reference phase angle θc. It is configured to be different.
That is, in the present embodiment, the unit axis distance Δhc is changed at an arbitrary position.

Specifically, as shown in FIG. 5 (c), for example, a plurality of rod-shaped members composed of the entire length of the stirring body (distance between the shafts between the rod-shaped blade 312A on the lowermost end side and the rod-shaped blade 312F on the uppermost end side) Lc. In the blades 312, 312,..., The rod-like wing 312 (rod-like wing 312A in FIG. 5) located on the lowermost side in the axial direction of the main shaft 311 and the rod-like wing 312 adjacent to the rod-like wing 312A (rod-like wing in FIG. 5) The unit phase angle Δθc1 during 312B) is obtained by the equation (4) based on the reference phase angle θc (Δθc1 = (Δhc1 / dc) × θc).
The distance between the unit axes between the two rod-shaped blades 312A and the rod-shaped blade 312B is Δhc1.

Further, for example, between the rod-shaped wing 312B and the rod-shaped wing 212 adjacent to the upper side (the rod-shaped wing 312C in FIG. 5), and between the rod-shaped wing 312C and the rod-shaped wing 312 adjacent to the upper side (the rod-shaped wing 312D in FIG. 5). The unit phase angle Δθc2 is obtained by the equation (4) based on the reference phase angle θc (Δθc2 = (Δhc2 / dc) × θc).
The unit-axis distance between the two rod-shaped blades 312C and the rod-shaped blade 312D is Δhc2.

Further, for example, the unit phase angle Δθc3 between the rod-shaped wing 312D and the rod-shaped wing 312D and the rod-shaped wing 312 adjacent to the upper side (the rod-shaped wing 312E in FIG. 5) is based on the reference phase angle θc. (Δθc3 = (Δhc3 / dc) × θc).
The unit-axis distance between the two rod-shaped blades 312D and the rod-shaped blade 312E is Δhc3.

  Since the unit axis distances Δhc1, Δhc2, and Δhc3 are set to be different from each other, the unit phase angles Δθc1, Δθc2, and Δθc3 are also different from each other.

  In the present embodiment, the reference phase angle θc is preferably set to be 50 [°] or more and 170 [°] or less, and is preferably 70 [°] or more and 150 [°] or less. More preferably, it is set.

  Thus, unlike the stirrer 101 of the first embodiment, the stirrer 301 in the present embodiment changes the unit axis distance Δhc without changing the reference phase angle θc, thereby allowing the unit phase angle Δθc at an arbitrary position. (For example, Δθc1) is configured to be different from the unit phase angle Δθc (for example, Δθc2 or Δθc3) at other positions.

  Even with the stirrer 301 having such a configuration, as in the stirrer 101 of the first embodiment, a very good stirring state is achieved for molten glass having a high viscosity of, for example, 500 [Pa · s] or more. can do.

[Stirrer 401 (fourth embodiment)] <Application>
Next, the structure of the stirrer 401 in 4th embodiment is demonstrated using FIG.
In the present invention, at least three rod-shaped blades 412, 412... Arranged continuously in the vertical direction satisfy the relationship of Δθ = (Δh / d) × θ (50 ° ≦ θ ≦ 170 °). That's fine.
An example of this application is shown in FIG.

  The stirrer 401 shown in FIG. 6 has a unit phase angle Δθ between the third and the fourth from the bottom of the seven rod-shaped blades 411, 411, that is, a reference phase angle θ for obtaining the unit phase angle Δθ. Although it is larger than 170 °, this is a combination of the first stirring body 450 of the present invention having three rod-shaped blades 411 and the second stirring body 460 of the present invention having four rod-shaped blades 460 vertically. Can see.

  Note that the total length d of the rod-shaped blades 411 does not have to coincide with each other, and the total length d used for calculating the unit phase angle Δθ formed by the two rod-shaped blades 411 and 411 is two rod-shaped blades 411. The average of the total length d of 411 may be used.

[Verification experiment (numerical analysis)]
Next, in order to confirm the stirring effect of the stirrer embodying the present invention, a verification experiment by numerical analysis performed by the present inventor will be described with reference to FIGS.

First, the present inventor set the following virtual condition as a precondition for conducting a verification experiment by numerical analysis.
That is, as shown in FIG. 7, assuming that the molten glass G is stirred using the stirrer 501, how the stirring state of the molten glass G changes by variously changing the configuration of the stirrer 501. I decided to verify.

The temperature and viscosity of the molten glass G were set to 1300 [° C.] and 570 [Pa · s], respectively.
Further, the basic configuration of the stirrer 501 is the same as that of the first embodiment described above.
That is, the stirrer 501 includes a plurality of rod-shaped blades 512, 512,... Perpendicular to the main shaft 511, at equal intervals along the axial direction of the main shaft 511, and adjacent to each other in the axial direction. Because of having an equiangular phase difference, a configuration in which a plurality of rod-shaped blades 512, 512,... Are arranged so that the trajectory of the end portion is spiral.

  Based on such “preconditions”, in the stirrer 501, regarding the change in the stirring state of the molten glass G when the reference phase angle is changed, commercially available simulation software (manufactured by Ansys Japan Co., Ltd .: FULLENT) ) Was used for numerical analysis.

  Specifically, as a first condition, it is defined that seven rod wings 512, 512,... Are arranged so that the total length of each rod wing 512 is 10 [cm], 11 [cm]. ] Or 12 [cm], and the numerical analysis was performed separately.

The analysis results obtained under such conditions are shown in FIG.
FIG. 8 shows the amount of glass movement (unit [kg / s]) on the vertical axis when the total length of the rod-shaped wings of the stirrer 501 is 10 [cm], 11 [cm], or 12 [cm]. The horizontal axis represents the reference phase angle (unit [°]) and is a graph showing the relationship between the two.

Here, the glass movement amount shown on the vertical axis is for numerically indicating the stirring state of the molten glass G. For example, the molten glass is flowed from the bottom to the top by the stirring of the stirrer 501. It is represented by the flow rate of G.
Further, the reference phase angle indicated on the horizontal axis is the reference phase angle in the stirrer 501.

As shown in this figure, the reference phase angle is 50 [°] or more and 170 [°] when the total length of the rod-like wings of the stirrer 501 is 10 [cm], 11 [cm], or 12 [cm]. °] or less, more specifically, glass movement of 0.05 [kg / s] or more can be maintained within a range of 70 [°] or more and 150 [°] or less. It can be seen that the molten glass G can be effectively stirred.
In addition, the reference phase angle is 90 [°] or more and 110 [°] regardless of whether the length of the rod-shaped wing 512 of the stirrer 501 is 10 [cm], 11 [cm], or 12 [cm]. In the following range, since the glass movement amount reaches a peak (maximum value), it can be seen that the stirrer 501 can stir the molten glass G more effectively.

  Next, as a second condition, the total length of each rod-like wing 512 is defined as 11 [cm], and numerical analysis is performed by dividing the number into three cases of five, six, or seven. I decided to do it.

The analysis results obtained under such conditions are shown in FIG.
FIG. 9 shows the amount of glass movement (unit [kg / s]) on the vertical axis when the number of rod-shaped blades 512, 512... In the stirrer 501 is 5, 6, or 7. The horizontal axis represents the reference phase angle (unit [°]) and is a graph showing the relationship between the two.

Here, the glass movement amount shown on the vertical axis is for numerically indicating the stirring state of the molten glass G. For example, the molten glass is flowed from the bottom to the top by the stirring of the stirrer 501. It is represented by the flow rate of G.
Further, the reference phase angle indicated on the horizontal axis is the reference phase angle in the stirrer 501.

As shown in this figure, the reference phase angle is not less than 50 [°] and 170 [°] when the number of rod-like blades 512, 512... In the stirrer 501 is 5, 6, or 7. °] or less, more specifically, glass movement of 0.05 [kg / s] or more can be maintained within a range of 70 [°] or more and 150 [°] or less. It can be seen that the molten glass G can be effectively stirred.
In addition, the reference phase angle is 90 [°] or more and 110 [°] or less, regardless of whether the number of rod-shaped blades 512, 512... In the stirrer 501 is 5, 6, or 7. In this range, since the glass movement amount reaches a peak (maximum value), it can be seen that the stirrer 501 can stir the molten glass G more effectively.

[Verification experiment (model experiment)]
Next, in order to confirm the stirring effect of the stirrer embodying the present invention, a verification experiment using a model performed by the present inventor will be described with reference to FIGS. 10 and 11.

First, the present inventors constructed a simulation model shown below in order to conduct a verification experiment using a model.
That is, as shown in FIG. 10, a stirrer 601 having a scale of about half of the actual size, a tank 651 corresponding to a glass stirring tank, and a viscous fluid Q corresponding to molten glass are prepared and stored in the tank 651. The fluid Q was stirred by the stirrer 601.

In addition, about the viscosity of the fluid Q, we decided to set the model viscosity corresponding to about 570 [Pa * s] which is the viscosity of a molten glass.
Further, the basic configuration of the stirrer 601 is the same as that of the first embodiment described above.
That is, the stirrer 601 includes a plurality of rod-shaped wings 612, 612... Perpendicular to the main shaft 611 and equidistantly spaced along the axial direction of the main shaft 611 and adjacent to each other. Because of the equiangular phase difference, the configuration is such that a plurality of rod-shaped blades 612, 612,...

  Based on such “preconditions”, in the stirrer 601, the change in the stirring state of the fluid Q when the reference phase angle is changed is grasped as a change in the load of the tank 651 (and the fluid Q), and is commercially available. The electronic balance 652 was used for measurement.

  Specifically, the overall length of each rod-shaped wing 612 is set to a model dimension corresponding to 11 [cm], and the number of the wings 612 is divided into three cases of five, six, or seven, and the tank 651 is divided. The load change of (and fluid Q) was measured.

The analysis results obtained under such conditions are shown in FIG.
In FIG. 11, when the number of rod-shaped blades 612, 612,... In the stirrer 601 is 5, 6, or 7, the vertical axis represents the load change contrast, and the horizontal axis represents the reference phase angle ( As a unit [°], it is a graph showing the relationship between these two.

Here, the contrast of the load change shown on the vertical axis is, for example, when the fluid Q is agitated by the stirrer 601 when the number of the rod-shaped blades 612 is six and the reference phase angle is 110 [°]. The ratio is obtained by comparison with the load measured based on the load.
The reference phase angle indicated on the horizontal axis is the reference phase angle in the stirrer 601.

As shown in this figure, the reference phase angle is 50 [°] or more and 170 [] when the number of rod-like blades 612, 612... In the stirrer 601 is 5, 6, or 7. °] or less, more specifically, in the range of 70 [°] or more and 150 [°] or less, the load change contrast can be maintained at 0.5 or more. It can be seen that the fluid Q can be stirred.
In addition, the reference phase angle is not less than 90 [°] and not more than 110 [°] regardless of the number of rod-shaped blades 612, 612. Since the load change contrast is a peak (maximum value), it can be seen that the stirrer 601 can stir the fluid Q more effectively.

DESCRIPTION OF SYMBOLS 1 Stirrer for molten glass 11 Main shaft 12 Rod-shaped blade 101 Stirr for molten glass 111 Main shaft 112 Rod-shaped blade 201 Stirr for molten glass 211 Main shaft 212 Rod-shaped blade da Total length of rod-shaped blade (first embodiment)
La Stirrer full length (first embodiment)
Δθa unit phase angle (first embodiment)
Δha Distance between unit axes (first embodiment)
θa Reference phase angle (first embodiment)
db Total length of rod-shaped wing (second embodiment)
Lb Stirring body full length (2nd embodiment)
Δθb1 unit phase angle (second embodiment)
Δθb2 unit phase angle (second embodiment)
Δhb Distance between unit axes (second embodiment)
θb1 reference phase angle (second embodiment)
θb2 reference phase angle (second embodiment)
dc Full length of rod-shaped wing (third embodiment)
Lc Stirring body full length (3rd embodiment)
Δθc1 unit phase angle (third embodiment)
Δθc2 unit phase angle (third embodiment)
Δθc3 unit phase angle (third embodiment)
Δhc1 Distance between unit axes (third embodiment)
Δhc2 Distance between unit axes (third embodiment)
Δhc3 Distance between unit axes (third embodiment)
θc Reference phase angle (third embodiment)

Claims (3)

The spindle,
A plurality of stages of rod-shaped wings fixed perpendicularly to the main shaft;
A stirrer for molten glass having
Any two of the rod-shaped wings adjacent to each other are
Seen from the axial direction of the main shaft,
Arranged so as to intersect each other with a unit phase angle Δθ satisfying Equation 1.
A stirrer for molten glass characterized by the above.
(Formula 1)
Δθ = (Δh / d) × θ
(Where Δh is the distance between the unit axes in the axial direction of the main shaft between the adjacent rod-shaped wings, d is the total length of the rod-shaped wings, and θ is the total length d of the inter-axis distance in the axial direction of the main shaft. (The reference phase angle between the rod-shaped blades is 50 ° or more and 170 ° or less.) In Equation 1,
The reference phase angle θ is a phase angle between two rod-shaped blades whose interaxial distance in the axial direction of the main shaft is the total length d, and is 70 ° or more and 150 ° or less.
The stirrer for molten glass according to claim 1, wherein: The rod-shaped wing is fixed in a state of being penetrated with respect to the main shaft,
The molten glass stirrer according to claim 1 or 2, wherein the stirrer is for molten glass.

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