JPS6113526Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a molten glass storage tank. More specifically, the present invention relates to a molten glass storage tank equipped with a flow rate adjusting means that can easily and accurately adjust the flow rate of low-viscosity molten glass to a desired level.

Conventionally, the method of flowing high temperature viscous fluid such as glass through an orifice while adjusting the flow rate is as follows.
As schematically shown in Figure 1 of the accompanying drawings, the plunger 22, which is not inserted into the narrow passage of the orifice 21, is moved up and down so that the central axis of the plunger and the orifice coincide with each other, and the liquid flows out. Methods for regulating the outflow amount of fluid 23 are known.

However, although the structure of the plunger and the method of operating the plunger in the conventional method can be used to adjust the flow rate of fluids that normally have a viscosity of several hundred poise or more, In the case of fluid, the misalignment between the center axis of the plunger and the center axis of the orifice, which tends to occur when the plunger is moved up and down, results in large flow rate fluctuations, and therefore the relationship between the vertical movement distance of the plunger and the flow rate also changes. It was difficult to adjust, and the flow rate adjustment accuracy was poor.

However, the inventors of the present invention have proposed a storage tank equipped with a flow rate adjustment means that can easily and accurately adjust the flow rate of low-viscosity molten glass to a desired flow rate and then flow the low-viscosity molten glass out of the storage tank. We conducted research to develop this, and arrived at this invention.

That is, the present invention is a molten glass storage tank in which bottom viscosity molten glass is stored so as to have a free surface, and the low viscosity molten glass is caused to flow out in the direction of gravity by adjusting the flow rate through an orifice provided at the bottom. , the orifice comprises a passage whose cross section in a direction perpendicular to the direction of passage of the low-viscosity molten glass has a circular cross section having substantially the same area, and an insertion rod having a tapered circular cross section;
The insertion rod is suspended vertically in a height-adjustable manner from a support that allows relatively free movement;
This suspended insertion rod is a molten glass storage tank characterized in that the molten glass present in the molten glass storage tank is constantly brought into contact with the passage side wall of the orifice by the horizontal flow of glass.

In the present invention, the flow rate of the low-viscosity molten glass flowing out through the orifice is controlled by an insertion rod inserted into the passage of the orifice, which can move up and down in the direction of gravity within the orifice to change the effective fluid passage area of the orifice. is adjusted by changing the insertion depth. The insertion rod is inserted into the passageway while the insertion rod is in contact with a side wall of the passageway,
After the insertion depth is set constant, the low-viscosity molten glass continues to flow out.

The insertion rod used in the present invention, which can change the effective fluid passage area of the orifice, has a circular cross section with substantially the same area (a cross section perpendicular to the direction of passage of the low-viscosity molten glass). , has a tapered circular cross section. That is,
By changing the insertion depth of the insertion rod into the orifice passage, the effective fluid passage area of the orifice, that is, the area obtained by subtracting the cross-sectional area of the insertion rod at that position from each cross-sectional area in the length direction of the orifice passage. Since the area showing the minimum value changes, the flow rate of the low viscosity molten glass is adjusted.

In the reservoir of the invention, such an insertion rod is constantly brought into contact with the side wall of the orifice passageway by the horizontal flow of molten glass present in the reservoir. Generally, in a molten glass storage tank such as a glass melting kiln in which an orifice is provided at the bottom end, a flow of molten glass exists within the kiln.

Since the insertion rod inside the orifice receives a force from the side direction due to the flow of the molten glass, according to the present invention, the insertion rod can be brought into contact with the side wall of the orifice by simply moving the insertion rod using a relatively free wire such as a metal wire. This can be achieved by suspending it from a support that allows movement.

In this invention, low viscosity molten glass is generally 10
It has a viscosity of ~100 poise, preferably about 20 to about 50 poise.

Figure 2 of the attached drawings shows a model experiment in which a low-viscosity fluid with a viscosity of 16 to 17 poise, prepared by mixing starch syrup and glycerin, was used in place of low-viscosity molten glass, and fluid flowed out. It is shown. Second
Figure -a is a cross-sectional view of the device used in experiments conducted in accordance with the present invention, showing the insertion rod in contact with the inner wall of the orifice. 2nd-
Figure b is a cross-sectional view of the device used in an experiment conducted for comparison with the present invention, and shows the insertion rod being inserted along the central axis of the orifice.

That is, in FIG. 2, 1 is a storage tank for low viscosity fluid (a mixture of starch syrup and glycerin), and the low viscosity fluid 4 that flows out through the orifice 2 with the flow rate adjusted by the insertion depth L of the insertion rod 3 is received. Vessel 5
It was received and weighed. The numerical values shown in the figure indicate the actual size (unit: mm) or actual angle (degree) of the device actually used in the experiment. FIG. 3 shows the relationship between the insertion depth L (mm) of the insertion rod into the orifice and the flow rate (Kg/hr) obtained from the above experiment. In Figure 3, line a is the second -
Line a is the result obtained from a model experiment conducted according to the present invention shown in Figure 2-b, and line b is the result obtained from an experiment conducted for the purpose of comparison with the present invention shown in Figure 2-b. This is the result. Further, A on the horizontal axis in FIG. 3 indicates the case where the insertion rod is pulled out from the storage tank 1.

Figure 4 shows the orifice diameter 12.5 in Figure 2.
Shown are the results of an experiment conducted under exactly the same equipment and conditions as shown in FIG. 2, except that φ was changed to 15.0φ. In Fig. 4, line a' is the result of a model experiment conducted according to the present invention (in the same manner as shown in Fig. 2-a), and line b' is the result for the purpose of comparison with the present invention ( (Same as shown in Figure 2-b)
The results are shown below. A on the horizontal axis of FIG. 4 represents the same meaning as in FIG. 3.

From FIGS. 3 and 4, when the insertion rod is brought into contact with the inner wall of the orifice and low viscosity fluid flows out according to the present invention, there is an almost linear relationship with the insertion depth of the insertion rod into the orifice. It can be seen that the outflow amount of low viscosity fluid fluctuates. Therefore, according to the present invention, the outflow amount of low-viscosity molten glass is approximately proportional to the insertion depth of the insertion rod into the orifice. In other words, the desired outflow amount is almost independent of the absolute amount of outflow amount. Since the insertion depth of the insertion rod to be changed can be kept approximately constant, it is very easy to precisely control the outflow amount. In addition, since the insertion rod is in contact with the side wall of the orifice, it is hardly displaced by the flow of low-viscosity molten glass, and therefore a constant flow rate can be stably supplied over a long period of time. You can also keep doing it. This can be understood, for example, by comparing line a' and line b' in FIG. That is, as mentioned above, line a' is the result obtained according to the present invention when the insertion rod is in contact with the side wall of the orifice, and line b' is the result obtained when the insertion rod is placed in the center of the orifice. Because it is a result,
For example, when the insertion rod is inserted into the orifice at a depth of 20 mm, there is a difference in the amount of low viscosity fluid flowing out between the two. When used, it is understood that the amount of fluid flowing out may vary within a range of approximately 40 Kg/hr even with the same insertion depth of 20 mm due to horizontal displacement of the insertion rod. It will be.

Furthermore, the orifice and insertion rod used in the present invention are not limited to the embodiment of the model experiment illustrated in FIG. 2-a above. According to the inventor's research, for low viscosity fluids of, for example, 10 to 100 poise, the design of the insertion rod, such as the orifice diameter, the diameter of the tip of the insertion rod and the attachment part, and the length between the tip and the attachment part. It has been shown that by appropriately selecting the following, it is possible to easily achieve a fluid flow rate of about 100 Kg/hr or less.

FIG. 5 schematically shows an embodiment of the storage tank of the present invention. In FIG. 5, 11 is the main body of the molten glass storage tank made of firebrick;
12 is molten glass with a free surface (arrow A indicates the flow direction of molten glass in the tank);
13 is a gas barter installation hole. In addition, 14 is the molten glass outflow orifice, and 16 is the orifice 1.
A protruding portion 4, 15 an insertion rod, 17 a metal wire (for example, stainless steel wire) from which the insertion rod is suspended, and arrows B indicate outflow of molten glass.

According to the embodiment shown in Fig. 5, molten glass (temperature 1200-1230°C, viscosity 20-30 poise) is supplied at a flow rate.
When set to a constant value in the range of 30 to 70 Kg/hr and allowed to flow in the direction of gravity, according to the present invention, the set value ±
It has become clear that it can be controlled within a range of 2%.

The effects achieved by the present invention are summarized as follows.

(1) Since it is possible to create a state in which the depth of insertion of the insertion rod into the orifice and the flow rate of low-viscosity molten glass show an almost linear relationship over a wide flow rate range, the accuracy of flow rate adjustment is improved.

(2) Since the insertion rod is in contact with the side wall of the orifice, even if the insertion depth of the insertion rod is changed, the linear relationship described above can be maintained stably.
Therefore, the flow rate adjustment operation is reproducible.

(3) Since there is a flow of low-viscosity molten glass that applies a lateral force to the insertion rod in the storage tank and the insertion rod is suspended, the insertion rod is constantly pressed against the orifice side wall by the flow. , so there is no flow rate fluctuation due to displacement of the insertion rod.
Therefore, the low viscosity molten glass can continue to flow out at a stable flow rate.

(4) The insertion rod can be simply suspended by a metal wire or the like, so the number of parts is small and maintenance is easy.

(5) By providing a stopper part at the upper base of the insertion rod that can close the orifice, simply by releasing the tension on the wire, the insertion rod will fall under its own weight and the orifice will be closed, making it possible to use low-viscosity molten glass in an emergency. It can be stopped quickly and easily.

[Brief explanation of the drawing]

FIG. 1 of the accompanying drawings is a schematic cross-sectional view of an orifice portion conventionally used for regulating the outflow of viscous fluid. FIG. 2-a is a sectional view of an apparatus used in a model experiment according to the present invention, and FIG. 2-b is a sectional view of an apparatus used in an experiment for comparison with the present invention. Figure 3 shows the relationship between the insertion depth of the insertion rod and the flow rate obtained in a model experiment according to the present invention, and Figure 4 shows the relationship between the same insertion depth and flow rate obtained in an experiment for comparison with the present invention. It shows the relationship between
FIG. 5 is a schematic cross-sectional view of one embodiment of the storage tank of the present invention.

Claims (1)

[Scope of utility model registration request] A molten glass storage tank in which molten glass with a bottom viscosity is stored so as to have a free surface, and the low viscosity molten glass is caused to flow out in the direction of gravity by adjusting the flow rate through an orifice provided at the bottom, the orifice having a free surface. consisting of a passage whose cross section in the direction perpendicular to the direction of passage of the molten glass has a circular cross section with substantially the same area, and an insertion rod having a tapered circular cross section,
The insertion rod is suspended vertically in a height-adjustable manner from a support that allows relatively free movement;
A molten glass storage tank characterized in that the suspended insertion rod keeps the molten glass present in the molten glass storage tank in constant contact with the passage side wall of the orifice due to the horizontal flow of glass.