JP2021091568A - Agitation stirrer and molten glass agitation device - Google Patents

Abstract

To enhance agitation performance for molten glass flowing nearby a shaft of an agitation stirrer in an agitation tank by improving the agitation stirrer.SOLUTION: An agitation stirrer 3 which comprises a shaft 4 and an agitation blade 5 extending from the shaft 4 in a shaft radius direction, and agitates molten glass G in a cylindrical agitation tank 2 comprises: an auxiliary blade 7 which extends circumferentially around the shaft 4 and is coupled to a tip part 6b of the agitation blade 5 (blade body 6), and a coupling member 8 which couples together the shaft 4 and auxiliary blade 7 in the shaft-radius directionally extended state.SELECTED DRAWING: Figure 1

Description

The present invention relates to a stirring stirrer for stirring molten glass in a cylindrical stirring tank, and a molten glass stirring device provided with a stirring tank and a stirring stirrer.

In the manufacturing process of a glass article represented by a glass plate, a glass tube, or the like, a stirring step of stirring and homogenizing the molten glass in a cylindrical stirring tank is executed. A stirrer equipped with a shaft and a stirring blade that swivels around the shaft as the shaft rotates is used to perform the stirring step. The stirrer stirs the molten glass while flowing in the stirring tank in the axial direction.

Here, Patent Document 1 discloses an example of a stirring stirrer. The stirring stirrer includes a plurality of stirring blades arranged at intervals in the axial direction. The plurality of stirring blades are arranged so that a phase difference is continuously generated between the plurality of stirring blades when turning around the axis. Further, in the stirring stirrer, the tips of the stirring blades adjacent to each other in the axial direction are connected by a rod-shaped connecting portion.

JP-A-2018-104212

By the way, one of the performances required for the stirring stirrer is that both the molten glass flowing near the inner wall surface of the stirring tank and the molten glass flowing near the shaft of the stirring stirrer can be suitably stirred. Then, in the stirring stirrer disclosed in Patent Document 1, it is necessary to further improve the stirring performance of the molten glass flowing near the shaft.

The present invention made in view of the above circumstances has a technical problem of improving the stirring performance of the molten glass flowing near the shaft of the stirring stirrer in the stirring tank by improving the stirring stirrer.

The present invention for solving the above problems is a stirring stirrer provided with a shaft and a stirring blade extending from the shaft in the axial direction of the shaft to stir the molten glass in a cylindrical stirring tank. It is characterized by including an auxiliary blade extending in the circumferential direction and connected to the tip of the stirring blade, and a connecting member connecting the shaft and the auxiliary blade in a state of extending in the axial direction of the shaft.

In this stirrer, a connecting member that connects the shaft and the aileron extends in the axial direction of the shaft. Therefore, the molten glass flowing near the shaft of the stirrer in the stirring tank (hereinafter referred to as the molten glass near the shaft) can be agitated not only by the stirring blade but also by the connecting member. As a result, it is possible to improve the stirring performance of the molten glass near the shaft. Regarding the molten glass flowing near the inner wall surface in the stirring tank (hereinafter referred to as molten glass near the wall), the tip of the stirring blade and the aileron extending in the circumferential direction around the axis connected to the tip. It is possible to stir by.

In the above stirrer, it is preferable that the stirring blade has a through opening and the connecting member is located within the range in which the through opening is opened in the axial direction.

In this way, the molten glass can be agitated as the through opening of the stirring blade is passed through the molten glass. Further, since the connecting member is located within the range in which the through opening is opened in the axial direction, the molten glass that has been agitated with the passage of the through opening can be continuously transferred to the through opening by the connecting member. It becomes possible to stir. Thereby, the stirring of the molten glass can be further promoted.

In the above stirrer, it is preferable that the aileron is present in the range of 45 ° to 180 ° around the axis.

In this way, it is possible to further enhance the effect of stirring the molten glass near the wall by the aileron.

In the above stirrer, it is preferable that the aileron extends spirally around the axis.

In this way, the effect of stirring the molten glass near the wall by the aileron can be further enhanced.

Further, the present invention for solving the above-mentioned problems is a molten glass stirring device provided with a cylindrical stirring tank in which an inlet and an outlet of molten glass are formed on a side wall and the above-mentioned stirring stirrer. , The stirring tank is formed as a cylinder, the inflow portion is arranged on one end side of the cylinder portion and includes the inflow port, and the outflow portion is arranged on the other end side of the cylinder portion and includes the outflow port. It is characterized in that the auxiliary wing is located in the tubular portion.

According to this stirring device, it is possible to similarly obtain the above-mentioned actions and effects in the above description of the stirring stirrer. Further, since the aileron is located in the tubular portion formed as a cylinder among each part of the stirring tank, it is possible to surely exert the effect of stirring the molten glass near the wall by the aileron. ..

Further, in the present invention for solving the above-mentioned problems, a cylindrical stirring tank in which an inlet and an outlet of molten glass are formed on a side wall and stirring in which the above-mentioned auxiliary blades spirally extend around an axis. A molten glass agitator equipped with a stirrer, in which a stirring tank is formed as a cylinder, an inflow portion arranged on one end side of the cylinder portion and including an inflow port, and the other end side of the cylinder portion. The shaft is located on the inflow side of the spiral formed by the auxiliary wing so that the part located on the inflow side is on the rear side of the turn when turning around the axis. It is characterized by rotating.

In this way, in the stirring tank, the flow of the molten glass in the opposite direction to the original flow of the molten glass (flow from the inflow portion side to the outflow portion side) can be generated with the rotation of the aileron. it can. Due to this reverse flow, it is possible to prevent the molten glass near the wall from flowing out of the stirring tank from the outflow portion (outlet) before the molten glass is sufficiently agitated, and it becomes possible to further promote the agitation of the molten glass. ..

According to the present invention, it is possible to improve the stirring performance of the molten glass flowing near the shaft of the stirring stirrer in the stirring tank.

It is sectional drawing which shows the molten glass stirrer which concerns on 1st Embodiment. It is a perspective view which shows the stirring stirrer provided in the molten glass stirrer which concerns on 2nd Embodiment. It is a perspective view which shows the stirring stirrer provided in the molten glass stirrer which concerns on 3rd Embodiment.

Hereinafter, the stirring stirrer and the molten glass stirring device according to the embodiment of the present invention will be described with reference to the accompanying drawings.

<First Embodiment>
As shown in FIG. 1, the molten glass agitator 1 (hereinafter, simply referred to as agitator 1) is agitated with a cylindrical agitator 2 having an inlet 2x and an outlet 2y of the molten glass G formed on a side wall thereof. It is provided with a stirring stirrer 3 for stirring the molten glass G in the tank 2.

The axis 2z of the stirring tank 2 extends in the vertical direction. The stirring tank 2 has a cylindrical portion 2a formed as a cylinder, an inflow portion 2b arranged on the upper end side of the tubular portion 2a and including an inflow port 2x, and an outflow port 2y arranged on the lower end side of the tubular portion 2a. It has an outflow portion 2c containing it. The two-dot chain lines B1 and B2 shown in FIG. 1 represent the boundary between the tubular portion 2a and the inflow portion 2b, and the boundary between the tubular portion 2a and the outflow portion 2c, respectively. The surface of the inner wall surface 2s of the stirring tank 2 is made of platinum or a platinum alloy. In the present specification, the platinum alloy includes, for example, a platinum-iridium alloy, a platinum-rhodium alloy, a platinum-gold alloy, and the like.

The inflow port 2x is an opening for allowing the molten glass G before stirring by the stirring stirrer 3 to flow into the stirring tank 2 as shown by a white arrow. On the other hand, the outlet 2y is an opening for allowing the molten glass G after stirring by the stirring stirrer 3 to flow out of the stirring tank 2, as shown by a white arrow. The molten glass G that has flowed into the stirring tank 2 is stirred by the stirring stirrer 3 while flowing from above to below in the stirring tank 2, and then flows out of the stirring tank 2.

The stirring stirrer 3 includes a shaft 4 arranged on the axis 2z of the stirring tank 2 and a plurality of stirring blades 5 that rotate around the shaft 4 as the shaft 4 rotates. The surfaces of the shaft 4 and the stirring blade 5 are made of platinum or a platinum alloy. In the present embodiment, the stirring stirrer 3 is provided with five stirring blades 5, but the number of stirring blades 5 may be increased or decreased as appropriate.

Here, in the following description, when distinguishing the five stirring blades 5, the "first stirring blade 5" and the "second stirring blade 5" are sequentially arranged from the stirring blade 5 arranged on the upper side of the shaft 4. , "Third stirring blade 5", "Fourth stirring blade 5", and "Fifth stirring blade 5" to distinguish them.

The shaft 4 is formed as a round bar extending in the vertical direction. The upper end of the shaft 4 is connected to a drive source (for example, a motor) (not shown). As the drive source operates, the shaft 4 rotates in the direction indicated by the arrow R in FIG. The lower end of the shaft 4 is a free end unlike the upper end.

The plurality of stirring blades 5 are arranged at intervals in the axial direction, and are arranged at equal intervals in the present embodiment. Of course, this is not the case, and the plurality of stirring blades 5 may be arranged at unequal intervals. Each of the plurality of stirring blades 5 extends from the shaft 4 in the axial radial direction (diameter direction of the stirring tank 2).

When the plurality of stirring blades 5 rotate around the shaft 4, the stirring blades 5 on the upper side (upstream side) of the shaft 4 are located around the shaft 4 with respect to the stirring blades 5 on the lower side (downstream side). It is arranged so that the phase is delayed. Specifically, between the two stirring blades 5 and 5 adjacent to each other in the axial direction, the stirring blade 5 on the relatively upper side is the shaft 4 by an angle of 45 ° with respect to the stirring blade 5 on the relatively lower side. The phase is delayed around. From the fifth stirring blade 5 having the most advanced phase to the first stirring blade 5 having the most delayed phase, the phases are delayed at the same pitch of the same angle of 45 °. Of course, this is not limited, and the phase difference between the adjacent stirring blades 5 and 5 may be changed from 45 °. Further, the phase difference between the plurality of stirring blades 5 may be unequal pitch.

Due to the above phase relationship, as the plurality of stirring blades 5 swivel around the shaft 4, an ascending flow of the molten glass G from the lower side to the upper side is formed in the vicinity of the shaft 4. The ascending flow is a flow opposite to the original flow in the stirring tank 2 (the descending flow of the molten glass G from the upper side to the lower side). Here, in order to preferably form the ascending flow of the molten glass G, the above phase difference is preferably in the range of 10 ° to 80 °.

Each of the plurality of stirring blades 5 includes a pair of blades 6 arranged symmetrically with respect to the axis 4. Each of the pair of blades 6 has two through openings 6a formed in a rectangular plate-like body in a vertical posture. Each through opening 6a is formed in a rectangular shape. Of course, this is not limited to this, and the shape of the through opening 6a may be another shape such as a circular shape or an elliptical shape. Further, the number of through openings 6a may be one or three or more. The tip portion 6b of each blade body 6 extends in the axial direction (vertical direction). A gap is formed between the inner wall surface 2s of the stirring tank 2 and the tip portion 6b of each blade body 6.

The molten glass G is agitated by the tip portion 6b and the through opening 6a as described below. That is, as the plurality of stirring blades 5 rotate around the shaft 4, the molten glass G is stirred by the tip portion 6b of each blade body 6 in the vicinity of the inner wall surface 2s of the stirring tank 2. Further, by passing the through opening 6a of the wing body 6 during turning through the molten glass G, the molten glass G and the wing body 6 are prevented from turning together around the shaft 4 in the same direction. The molten glass G is agitated as it passes through the through opening 6a.

Here, in order to preferably agitate the molten glass G by the tip portion 6b of the blade body 6, the length L of the tip portion 6b is set with reference to the distance D between the two stirring blades 5 and 5 adjacent to each other in the axial direction. It preferably has a length of 50% to 200%. Further, in order to facilitate the passage of the through opening 6a through the molten glass G, the opening ratio of the through opening 6a in each blade 6 is preferably 30% or more. The "aperture ratio" referred to here is the opening area of the penetrating opening 6a with respect to the area of the rectangular plate-shaped body (the plate-shaped body in which the penetrating opening 6a is not formed) which is the source of the blade body 6. Means the proportion of. When a plurality of through openings 6a are provided, the opening area of the through openings 6a means the total opening area obtained by adding the opening areas of the through openings 6a.

Of the first stirring blades 5 to 5, the fifth stirring blade 5, the auxiliary blade 7 is connected to the third stirring blade 5. The aileron 7 is not only connected to the third stirring blade 5, but also to the shaft 4 via the connecting member 8. The surfaces of the aileron 7 and the connecting member 8 are made of platinum or a platinum alloy.

The third stirring blade 5 is housed in the tubular portion 2a of the stirring tank 2. As a result, the aileron 7 connected to the third stirring blade 5 is also located in the tubular portion 2a. In the present embodiment, the aileron 7 is connected only to the third stirring blade 5, but the aileron 7 may be connected to the stirring blade 5 other than the third stirring blade 5. However, the stirring blade 5 to which the aileron 7 is connected may be only the stirring blade 5 housed in the cylinder portion 2a among the cylinder portion 2a, the inflow portion 2b, and the outflow portion 2c of the stirring tank 2. preferable. That is, in the case of connecting the aileron 7 to the stirring blade 5 other than the third stirring blade 5 in the present embodiment, it is preferable to connect the auxiliary blade 7 to the fourth stirring blade 5. This is because (1) the aileron 7 preferably exerts the stirring effect of the molten glass G, (2) the aileron 7 accurately forms an ascending flow of the molten glass G (described later), and (3) stirring. This is from the viewpoint of avoiding the complication of the structure of the stirrer 3.

In this embodiment, two ailerons 7 are connected to the third stirring blade 5. Each of the two ailerons 7 extends spirally around the axis 4. When each aileron 7 is viewed from the axis 2z direction of the stirring tank 2, it forms a semicircle centered on the shaft 4. That is, one of the ailerons 7 and 7 is in the 180 ° range around the shaft 4, and the other is in the remaining 180 ° range around the shaft 4. Such an aileron 7 is along the inner wall surface 2s of the stirring tank 2.

When turning around the shaft 4, both the leading portion 7a located at the head of the aileron 7 and the rearmost portion 7b located at the tail end are both blade bodies 6 provided in the third stirring blade 5. It is connected to the tip portion 6b of the. When turning around the shaft 4, when the surface located on the front side of the front and back surfaces of the wing body 6 is defined as the "front surface" and the surface located on the rear side is defined as the "rear surface", the aileron 7 is used. The front portion 7a of the wing body 6 is connected to the back surface of the wing body 6, and the rear end portion 7b is connected to the front surface of the wing body 6.

Due to the spiral formed by the aileron 7, there is a height difference between the leading portion 7a and the rearmost portion 7b of the aileron 7. More specifically, the leading portion 7a of the aileron 7 exists at a lower position than the rearmost portion 7b. The leading portion 7a of the aileron 7 is connected to the lower end of the tip portion 6b of the blade body 6, and the rearmost portion 7b is connected to the upper end of the tip portion 6b of the blade body 6. As a result, of the spiral formed by the aileron 7, the portion located on the inflow portion 2b side of the stirring tank 2 becomes the turning rear side when turning around the shaft 4.

Here, in the present embodiment, the shape of the cross section orthogonal to the longitudinal direction of the aileron 7 is rectangular. Of course, this is not limited to this, and the cross-sectional shape may be another shape such as a circle, an ellipse, or a polygon.

The molten glass G is agitated by the aileron 7 as described below. That is, as the aileron 7 swivels around the shaft 4, the molten glass G is agitated while the aileron 7 blocks the downward flow of the molten glass G in the vicinity of the inner wall surface 2s of the stirring tank 2. .. Further, the spiral formed by the aileron 7 forms an ascending flow of the molten glass G from the lower side to the upper side in the vicinity of the inner wall surface 2s of the stirring tank 2 as the aileron 7 swirls around the shaft 4. Aileron. As a result, the effect of blocking the downward flow of the molten glass G is further enhanced.

The connecting member 8 connects the shaft 4 and the aileron 7 in a state of extending in the axial direction of the shaft. When the connecting member 8 is viewed from the axis 2z direction of the stirring tank 2, it extends in a direction orthogonal to the third stirring blade 5. As a result, the outer end portion of the connecting member 8 in the axial direction is connected to the intermediate portion of the aileron 7. Of course, this is not limited, and the connecting member 8 and the third stirring blade 5 may intersect at an arbitrary angle when viewed from the axis 2z direction. The connecting member 8 is located within the range in which the through opening 6a of the blade body 6 is opened in the axial direction. Specifically, the connecting member 8 exists at a height located between the upper side and the lower side of the rectangle formed by the through opening 6a in the axial direction.

Here, in the present embodiment, the shape of the cross section orthogonal to the longitudinal direction of the connecting member 8 is circular. Of course, this is not limited to this, and the cross-sectional shape may be another shape such as an ellipse, a rectangle, or a polygon.

The molten glass G is agitated by the connecting member 8 as described below. That is, the molten glass G that has been agitated with the passage of the through opening 6a of the wing body 6 is further agitated by the connecting member 8 located within the range in which the through opening 6a of the wing body 6 is opened in the axial direction. To.

Hereinafter, the main actions / effects of the stirring device 1 and the stirring stirrer 3 will be described.

In the stirring stirrer 3 provided in the stirring device 1, the connecting member 8 connecting the shaft 4 and the aileron 7 extends in the axial radial direction. Therefore, the molten glass G flowing in the vicinity of the shaft 4 of the stirring stirrer 3 in the stirring tank 2 can be stirred not only by the first stirring blades 5 to 5 but also by the connecting member 8. As a result, it is possible to improve the stirring performance of the molten glass G flowing in the vicinity of the shaft 4. Further, regarding the molten glass G flowing in the vicinity of the inner wall surface 2s in the stirring tank 2, the tip portion 6b of the stirring blade 5 and the aileron 7 extending in the circumferential direction around the shaft 4 connected to the tip portion 6b are used. Can be agitated by.

Hereinafter, the molten glass stirrer and the stirrer according to another embodiment of the present invention will be described with reference to the accompanying drawings. In the description of the other embodiments, with respect to the elements that are substantially the same as the elements already described in the first embodiment, the drawings referred to in the description of the other embodiments are designated by the same reference numerals. Duplicate explanations will be omitted.

<Second embodiment>
FIG. 2 shows a stirring stirrer 3 provided in the stirring device 1 according to the second embodiment. The difference between the stirring stirrer 3 according to the second embodiment and the stirring stirrer 3 according to the first embodiment is that the configurations of the aileron 7 and the connecting member 8 are different.

In the stirrer 3, unlike the first embodiment, each of the two ailerons 7 exists in a range of 90 ° around the shaft 4. On the other hand, the phase difference (angle θ1 shown in FIG. 2) between the two stirring blades 5 and 5 adjacent to each other in the axial direction is 45 ° as in the first embodiment. The two ailerons 7 are arranged symmetrically with respect to the axis 4. Further, in the present stirring stirrer 3, the shape of the cross section orthogonal to the longitudinal direction of the connecting member 8 is rectangular.

Here, in the first embodiment described above, each of the two ailerons 7 exists in a range of 180 ° around the shaft 4, and in the present embodiment, each of the two ailerons 7 is on the shaft 4. It exists in the range of 90 ° around, but this is not the case. The range of the angle at which the aileron 7 exists around the shaft 4 (angle θ2 shown in FIG. 2) may be changed, and may be changed, for example, within the range of 45 ° to 180 °.

<Third Embodiment>
FIG. 3 shows a stirring stirrer 3 provided in the stirring device 1 according to the third embodiment. The difference between the stirring stirrer 3 according to the third embodiment and the stirring stirrer 3 according to the first embodiment is that the configurations of the blade body 6, the aileron 7, and the connecting member 8 are different. Is.

In the present stirring stirrer 3, each of the two ailerons 7 exists in a range of 90 ° around the shaft 4 and has a cross section orthogonal to the longitudinal direction of the connecting member 8 in the same manner as in the second embodiment described above. The shape is rectangular. Further, only a single through opening 6a is formed in the blade body 6.

Here, the stirring stirrer and the molten glass stirring device according to the present invention are not limited to the configurations described in each of the above embodiments. For example, in the stirring stirrer 3 according to each of the above embodiments, the blade body 6 is formed with a through opening 6a in a rectangular plate-like body in a vertical position, but the present invention is not limited to this. .. As an example, a rectangular frame may be produced by connecting a plurality of square bars or rods such as round bars vertically and horizontally, and the frame may be used as the blade 6.

In the stirring stirrer 3 according to each of the above embodiments, the aileron 7 extends spirally around the shaft 4, and there is a height difference between the front portion 7a and the rearmost portion 7b of the aileron 7. However, it is not limited to this. The aileron 7 may extend in an arc shape without a height difference between the leading portion 7a and the rearmost portion 7b of the aileron 7. From the viewpoint of enhancing the effect of blocking the downward flow of the molten glass G, it is preferable that the aileron 7 extends in a spiral shape.

In the stirring device 1 according to each of the above embodiments, the molten glass G is stirred by the stirring stirrer 3 while flowing in the stirring tank 2 from the upper side to the lower side, but the present invention is not limited to this. The molten glass G may be stirred by the stirring stirrer 3 while flowing in the stirring tank 2 from the lower side to the upper side. That is, the inflow portion 2b (inflow port 2x) may be provided in the lower part of the stirring tank 2, and the outflow portion 2c (outlet 2y) may be provided in the upper part.

1 Molten glass agitator 2 Stirrer 2a Cylinder 2b Inflow 2c Outflow 2x Inlet 2y Outlet 3 Stirrer 4 Axis 5 Stirrer 6a Through opening 6b Tip 7 Auxiliary wing 8 Connecting member G Molten glass

Claims (6)

A shaft and a stirring blade extending from the shaft in the axial direction of the shaft are provided.
A stirring stirrer for stirring molten glass in a cylindrical stirring tank.
It is characterized by including an aileron extending in the circumferential direction around the shaft and connected to the tip of the stirring blade, and a connecting member connecting the shaft and the aileron in a state of extending in the axial direction. Stirring stirrer. The stirring blade has a through opening and
The stirring stirrer according to claim 1, wherein the connecting member is located within a range in which the through opening is opened in the axial direction. The stirring stirrer according to claim 1 or 2, wherein the aileron is present in the range of 45 ° to 180 ° around the axis. The stirring stirrer according to any one of claims 1 to 3, wherein the aileron extends spirally around the axis. A molten glass stirring device including a cylindrical stirring tank in which an inlet and an outlet of molten glass are formed on a side wall, and a stirring stirrer according to any one of claims 1 to 4.
The stirring tank includes a cylindrical portion formed as a cylinder, an inflow portion arranged on one end side of the tubular portion and including the inflow port, and an inflow portion arranged on the other end side of the tubular portion and including the outflow port. It has an outflow part and
A molten glass agitator characterized in that the aileron is located in the tubular portion. A molten glass stirring device including a cylindrical stirring tank in which an inlet and an outlet of molten glass are formed on a side wall, and the stirring stirrer according to claim 4.
The stirring tank includes a cylindrical portion formed as a cylinder, an inflow portion arranged on one end side of the tubular portion and including the inflow port, and an inflow portion arranged on the other end side of the tubular portion and including the outflow port. It has an outflow part and
A molten glass agitator characterized in that the shaft rotates so that a portion of the spiral formed by the aileron is located on the inflow portion side so that the portion located on the inflow portion side is on the swivel rear side when turning around the shaft.

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