JPS596823B2 - Air nozzle assembly for glass fiber spinning - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air nozzle assembly for spinning glass fibers, and more particularly to an air nozzle assembly for blowing an air stream onto an orifice plate surface of a glass fiber spinning furnace.

Conventionally, a method of spinning glass fibers by blowing an air stream onto the orifice plate surface of a glass fiber spinning furnace is known.
A typical example thereof is disclosed in Japanese Patent Publication No. 51-46859.

The disclosed method involves molten glass flowing through an orifice forming a cone of molten glass on the orifice plate surface, and a large number of orifices piercing each other so closely that the cones merge into each other. When spinning glass fibers from an orifice plate with a flat surface provided with holes, stable cones are formed and the cones are cooled and placed in close proximity to the orifice plate. the orifice plate substantially parallel to and toward the orifice plate to eliminate the stagnant gas that is being spun from the orifice and to replenish the gas that is wicked downwardly by the spun fibers; It directs the airflow that reaches the area. This method can also be applied to the production of glass fibers by means of so-called tip nozzles. An example of an air nozzle device for blowing an air stream onto the orifice plate surface in the above type of glass fiber spinning method is US Pat. No. 3,986,855.
There is a device disclosed in No. 3, in which air introduced at equal pressure from a plurality of introduction pipes is guided into an air nozzle body and blown out from one continuous opening. However, since the air nozzle device of this US patent has a large diameter blowout opening, the pressure of the airflow hitting the orifice plate surface is weak, and the cooling effect is determined by the pressure hitting the orifice plate rather than the amount of air, so the cooling effect is ultimately strong. On the other hand, increasing the amount of air in order to increase the cooling effect had disadvantages such as increasing the frequency of filament cutting.

Therefore, in consideration of this point, the special public
There is an air nozzle device disclosed in Publication No. 293,
This is a system in which multiple tubular nozzles, each independent of the other, are fixed to a fixture in a row in parallel at intervals, and in this way, instead of one large blowout opening, multiple independent tubular nozzles are arranged in parallel at intervals. By using a tubular nozzle, we succeeded in increasing the pressure of the air flow hitting the orifice plate surface and increasing the cooling effect.

Also, similar to the one disclosed in Japanese Patent Publication No. 54-33293, an air nozzle device having a configuration in which a plurality of independent tubular nozzles are arranged side by side is disclosed in Japanese Patent Publication No. 54-10.
In this air nozzle device, each tubular nozzle is connected to a manifold through a communication passage, and each communication passage is provided with a valve for independently and individually controlling the flow rate of each tubular nozzle. A mechanism is built in.

In this air nozzle device as well, the air flow is discharged from multiple independent tubular nozzles.
US Pat. No. 3,986,853 similar to that of -33,293
It was able to provide a superior cooling effect compared to the No. However, in the air nozzle device disclosed in JP-A-54-101925, in order to avoid contact between the external operating part of the nozzle mechanism and the glass filament being spun from the orifice plate, the air nozzle assembly is There was a problem in that it had to be installed at an angle to the plate surface.

Specifically, the air nozzle assembly is usually installed behind the filament group with its longitudinal direction aligned with the longitudinal direction of the orifice plate, with the external operation part of its valve mechanism facing the filament side, and the valve operation is performed by This is done from the working passage side facing the air nozzle assembly across the filament group.

In this case, the external operating part of the valve mechanism is a protrusion located on the underside of the air nozzle part, so in order to prevent it from coming into contact with the glass filament, place the air nozzle assembly against the orifice plate surface. It has to be installed at an angle. However, installing the air nozzle assembly at an angle such as this presents a problem in that uniform cooling is not achieved.

In other words, when glass filaments are being spun from the orifice plate, surrounding air is drawn in due to the rapid movement of the glass filaments, and a guided air flow toward the group of glass filaments is generated near the orifice plate. The guided air flow changes direction from the air nozzle to the orifice plate and collides with the air escaping to the surrounding area. When the air nozzle is tilted significantly, the horizontal component of the air flow increases and flows more from behind the orifice plate to the front, and this air flow is combined with the guided air flow to form a strong horizontal flow that flows behind the orifice plate. This will overcool the glass cone and cause breakage of the glass filament. Therefore, the air nozzle assembly is preferably mounted as perpendicular to the orifice plate surface as possible to minimize the adverse effects of induced air flow and to achieve uniform cooling. The present invention has been made in view of the above-mentioned drawbacks of the prior art, and its object is to provide an air nozzle assembly for blowing air flow onto an orifice plate surface of a glass fiber spinning furnace, in which air is blown out from each nozzle passage. The provision of a valve arrangement that allows for individual fine adjustment of the flow rate also allows the air nozzle assembly to be installed substantially perpendicular to the plane of the orifice plate.

To achieve the above object, the present invention provides an air nozzle assembly for blowing an air flow onto an orifice plate surface of a glass fiber spinning furnace, the air nozzle assembly comprising an air inlet having a manifold having an air supply port; , an air nozzle section having a plurality of nozzle passages, the air introduction section also having a plurality of communication passages located on the manifold and formed to communicate with the manifold, and these communication passages. a valve block including a plurality of valve mechanisms respectively incorporated in the valve block, and a plurality of auxiliary communication passages located between the valve block and the air nozzle portion and communicating the communication passages of the valve block with the nozzle passages, respectively. the auxiliary communication passage has a guide block with a guide block, and the auxiliary communication passage has a portion of the valve block located on the communication passage side that is located on the nozzle passage side, and a portion of the auxiliary communication passage that is located on the external operation portion of the valve mechanism. An air nozzle device is provided characterized in that it is biased in opposite directions.

Preferred embodiments of the present invention will be described with reference to the drawings.
The figure shows the use of the air nozzle assembly of the present invention in a spinning apparatus, shown in side cross-section. In the figure, the reference numeral 2 indicates a glass fiber spinning furnace, and the molten glass that has been melted in advance and adjusted to a constant temperature in the spinning furnace 2 passes through an inlet passage 6 made in the refractory 4 and flows into the platinum alloy below. It flows into the spinning bushing 8. The bushing 8 has a box-like shape with an orifice plate 10 having a large number of orifices on the lower surface and a plate rising from the plate to form a side wall 12.Although not shown in the figure, the bushing 8 has a controlled low A pair of terminals for carrying high voltages and currents is provided on the exterior of the sidewall plate 12, usually on the widthwise side of the bushing. By passing current from the terminal mainly through the orifice plate 12 and to some extent through the side wall plate 12, these plates made of platinum alloy generate heat, increasing the temperature of the entire bushing, especially the temperature of the orifice plate 10, and increasing the temperature of the molten glass. Prevent the temperature from dropping and control the temperature to be suitable for spinning. This control is typically performed by the sidewall plate 12 of the bushing.
As an input signal, the thermoelectromotive force from a thermocouple welded to
This is done by a loop that controls the current flow to maintain a constant temperature in the bushing. In the illustrated embodiment, the orifice plate 10 is of the type disclosed in Japanese Patent Publication No. 51-46859, which has a large number of closely arranged orifices on the flat bottom surface, but a large number of tip nozzles protrude from the bottom surface of the plate. , a so-called tip nozzle plate may be formed.

The molten glass flowing out from the orifice of the orifice plate 10 is pulled by the winder 14 and is thinned into a filament while forming a cone at the outlet of the orifice, and a sizing agent is applied to this filament by the application roller of the applicator 16. The strands are collected into one or more strands by a converging roll 18, and wound around a drum of a winder 14 while being twisted by a traverse device 20 to form a package 22.

Reference numeral 24 designates an air nozzle assembly of the present invention for blowing an air stream onto the lower surface of the orifice plate 10, thereby cooling the surface of the orifice plate and causing the molten glass to flow out of the orifice and be atomized to form a filament. forming stable molten glass cones at the orifice outlet, cooling the cones and eliminating stagnant gases present in the vicinity of the orifice plate 10 and sucked downward by the spun fibers. Replenish gas.

Air nozzle assembly 24 is connected to an air supply conduit or hose 26 and is supplied with air from a pressurized air source, not shown.

Details of the structure of the air nozzle assembly 24 are shown in FIGS.
It is shown in the figure and roughly divided into an air introduction section 32 equipped with a manifold 30 having an air supply port 28, and an air nozzle section 36 equipped with a plurality of nozzle passages 34 communicating with the manifold 30.

The air nozzle portion 36 may be a tubular nozzle made of a metal pipe as disclosed in Japanese Patent Application Laid-Open No. 54-101925, but preferably, a plurality of nozzle ribs 38 having the same shape are successively arranged side by side. However, each nozzle rib 38 has recesses 44 and 46 extending in the longitudinal direction in the opposing joining surfaces 40 and 42, and the adjacent nozzle ribs 38 One nozzle passage 34 is formed by one recess 44 and the other recess 46.

Since only the partition wall 48 serving as the bottom of the recesses 44 and 46 exists between adjacent nozzle passages 34, the nozzle passages 34
By making the interval between the nozzle passages 34 extremely small, the number of air streams blown out from the nozzle passage 34 can be increased in density. The fit for combining each nozzle rib 38 is achieved by forming vertical step portions 50, 5 of complementary shapes near the edges of the opposing combining surfaces 40, 42.
2, the adjacent vertical steps 50, 5
It is done by 2.

However, instead of a vertical step, it is also possible to form a dovetail-shaped inclined step, in which case separation of the nozzle ribs from each other is actively prevented. The recesses 44 and 46 formed in each nozzle rib 38 are shaped so that the nozzle passage formed between adjacent nozzle ribs has an octagonal cross-section that is elongated in the direction of the combined surface. The cross-sectional shape of the nozzle passage may be, for example, a rectangle or other elongated polygon, an oval or an ellipse, or a circle. The nozzle rib 38 can be made of metal such as ordinary iron, in which case the recesses 44, 46 described above can be easily made by grinding or extrusion.

Therefore, the recesses 44 and 46 can have any shape,
The cross-sectional shape of the nozzle passage can be freely selected.
Note that the nozzle rib 38 may be made of materials other than iron, such as stainless steel or aluminum alloy. Even in these cases, the recesses 44 and 46 can have any shape, and the cross-sectional shape of the nozzle can be freely selected. The cross-sectional shape of the nozzle passage is preferably elongated in the direction of the combined surface of the nozzle ribs 38, as in the illustrated embodiment. By doing so, the density of the nozzle passage can be increased with the same cross-sectional area, and the density of the number of air flows can be further increased. Further, as explained on page 4 of Japanese Patent Publication No. 54-33293, by arranging the air nozzle part 36 so that the short axis of the cross-sectional shape of the nozzle passage is parallel to the longitudinal direction of the orifice plate 10, the nozzle It is possible to provide a wider uniform cooling effect in the width direction of the orifice plate, which corresponds to the long axis direction of the passage, and it is possible to increase the range of widthwise arrangement of orifices on the orifice plate. In the illustrated embodiment, the nozzle rib 38
Although recesses 444 and 46 are formed in both of the combined surfaces 40 and 42, a nozzle passage can be similarly obtained even if a recess is formed in only one of the combined surfaces 40 and 42.

Further, since the nozzle ribs located at both ends have only one combined surface, the end ribs 54 and 56 can have a flat shape with no recess on the surface other than the combined surface, as shown in FIG. The air nozzle portion 36 of the illustrated embodiment also includes a nozzle block 3 formed by juxtaposing and combining nozzle ribs 38.
9 has a device for holding it firmly.

This holding device consists of a pair of iron holding plates 58 and 60 located on both sides of the nozzle block 39, and
A pair of iron clamping plates 62, 64 are located at both ends of the nozzle block 39. has been done. Four screw holes 68 are formed in each of the clamping plates 62 and 64, and a set screw 70 is fitted into each of these screw holes 68. Therefore, by turning these set screws 70 and pressing the end faces of the end ribs 54, 56 of the nozzle block 39 with their tips, the nozzle block 39 is clamped and held firmly.
The air nozzle section 36 of the illustrated embodiment is also provided with a metal support block 72, such as common iron, for supporting the juxtaposed and combined nozzle blocks 39.

The support block 72 has a recess 74 for receiving the lower end of the nozzle block 39, the recess 74 being open not only upwardly but also outwardly at both ends; 74 can be easily formed by grinding or the like. The width dimension of the recess 74 is larger than the thickness of the nozzle block 39, and a spacer 76 is inserted into the extra dimension as shown in FIG. The set screw 18 is screwed into the four screw holes 78 that have been drilled.
The tip of the nozzle block 39 is pressed toward the nozzle block 39 and firmly holds the lower end of the nozzle block 39. A pair of positioning plates 82 and 84 are fixed to both ends of the recess 74 with bolts. The support block 72 also has communication passages 86 formed at positions aligned with each of the nozzle passages 34 of the nozzle block 39. The support block 72 is connected with a bolt to a guide block 88 for position adjustment, which will be described later. In addition to the manifold 30, the air introduction section 32 includes
A valve block 92 is located on the manifold 30 and includes a plurality of communication passages 100 formed to communicate with the manifold 30 and a plurality of valve mechanisms 90 respectively incorporated in the communication passages 100;
2 and the air nozzle portion 36, and includes a plurality of auxiliary communication passages 114 for communicating the communication passages 100 of the valve block with the nozzle passages 34, respectively.

The manifold 30 is made of iron plate material or the like connected together in a box shape with bolts, and a nipple 94 for connecting the hose 26 is connected with a bolt at a position corresponding to the air supply port 28.

In the illustrated embodiment, the number of air supply ports 28 and nipples 94 is four, and in this case, the interior of the manifold 30 is also divided into four corresponding chambers by three partition plates 96. Further, valve devices (not shown) for adjusting air flow rate are installed between the hose 26 connected to each nipple 94 and the air supply source, and by controlling each valve device independently, the nozzle block can be adjusted. The flow rate of the air flow blown out from the 39 nozzle passages 34 can be divided into four corresponding groups and individually controlled. Note that reference numeral 98 is a screen for removing foreign matter from the air flow. Valve blocks 92 are preferably made of ordinary iron and are secured to the upper end of manifold 30 by bolts and each open into manifold 30 and communicate with passageway 8 of support block 72.
It has a communication path 100 that communicates with 6.

Each communication passage 100 incorporates a valve mechanism 90 for finely adjusting the flow rate of airflow therethrough. The valve mechanisms 90 are preferably staggered in two stages as shown in FIG. By doing this, the communication passages 100 can be closely arranged, and even the nozzle block 3 can be closely arranged.
This allows close alignment of the nozzle passages at 9 and facilitates operation of the valve mechanism 90. Each valve mechanism 90
may have a structure as described in JP-A-54-101925, but is preferably a needle-type valve, and the diameter of the corresponding communication passage 100 is A valve hole 102 with approximately the same diameter or a slightly larger diameter is bored, and a thread is cut in the inlet end of this valve hole 102, and a needle valve portion 104 with approximately the same diameter as the valve hole 102 and a valve hole 102 are connected. A bolt-shaped needle valve 108 having a threaded portion 106 corresponding to a screw is inserted into the valve hole 102. The head 110 of the bolt-like needle valve 108 is desirably as small as possible in view of the close arrangement, and is of the cap screw type that can be operated with a bolt wrench. A coil spring 112 is disposed between the head 110 of the bolt-shaped needle valve 108 and the valve block 92, and the coil spring 112 is arranged between the valve hole 102 and the bolt-shaped needle valve 1.
It is designed to absorb some play between the 08 and 08, allowing for slight movements. Therefore, by inserting a bolt wrench into the head 110 and turning the bolt-shaped needle valve 108, the needle valve part 104 can be moved in and out of the valve hole 102 to change the opening degree of the communication passage 100 and finely adjust the flow rate. I can do it. A flow rate leg that divides the air flow blown out from the nozzle passage 34 of the nozzle block 39 into four sections by a valve device (not shown) connected to the aforementioned hose 26, and the air blown out from the nozzle passage 34 by this valve mechanism 90. Individual fine-tuning of the flow allows a wide range of flow rates. Guide block 88, preferably made of ordinary iron, is bolted and supported on valve block 92 and bolts and supports support block 72.

The auxiliary communication path 114 formed in the guide block 88 is
The portion of the valve block located on the side of the communication passage is biased in the opposite direction from the portion located on the side of the nozzle passage 34 from the external operating portion of the valve mechanism 90, ie, the head 110 of the needle valve 108. By doing so, the head 110 of the bolt-shaped needle valve 108, the valve block 92, and the manifold 30 are attached to the nozzle block 39 and the support block 72, as shown in FIG.
The air nozzle assembly 24 can be placed in a retracted state from the front side (left side as seen in FIG. 3) of the air nozzle assembly 24, such as the head of the needle valve 108, in the operating state shown in FIG. can be placed under the orifice plate 10 and as perpendicular to it as possible without contacting the glass filament being spun. Therefore, the airflow blown out from the nozzle passage 34 impinges on the orifice plate surface at a substantially right angle, minimizing the adverse effects of the induced airflow from around the orifice plate, thus uniformly cooling the orifice plate and the molten glass cone. I can do it,
The above-mentioned problem of the prior art in which the air nozzle assembly had to be installed at an angle can be solved. Therefore, according to the present invention, a guide block having a plurality of auxiliary communication passages for communicating the communication passages of the valve block with the nozzle passages is disposed between the valve block and the air nozzle portion, and the auxiliary communication passages are The part of the valve block located on the communicating passage side is biased in the opposite direction from the external operating part of the valve mechanism with respect to the part located on the nozzle passage side, so that the air nozzle assembly is aligned with the orifice plate surface. The air nozzle assembly allows the air flow from the air nozzle assembly to impinge almost perpendicularly to the orifice plate surface, minimizing the negative effects of induced air flow from around the orifice plate surface. , the orifice plate surface can be cooled extremely uniformly.

[Brief explanation of drawings]

FIG. 1 is an explanatory side sectional view of the air nozzle assembly of the present invention showing its use in a spinning apparatus; FIG. 2 is a partially sectional front view of a preferred embodiment of the air nozzle assembly of the present invention; FIG. 3 is a longitudinal sectional view of the air nozzle assembly of FIG. 2;
4 is a partially enlarged view of the tip of the nozzle block in the air nozzle assembly of FIG. 2, and FIG. 5 is a portion of the end clamping plate of the nozzle block holding device in the air nozzle assembly of FIG. 2. FIG. In the figure, code 2...Glass fiber spinning furnace, 10...
... Orifice plate, 24 ... Air nozzle assembly, 28 ... Air supply port, 30 ...
... Manifold, 34 ... Nozzle passage, 36
... Air nozzle section, 88 ... Guide block, 90 ... Valve mechanism, 92 ...
・Valve block, 100...Communication path, 110
・・・・・・Needle valve head (external operation part), 11
4... Auxiliary communication path.

Claims (1)

[Claims] 1. An air nozzle assembly for blowing an air flow onto the orifice plate surface of a glass fiber spinning furnace, the air nozzle section having an air introduction section equipped with a manifold having an air supply port, and a plurality of nozzle passages. The air introduction section also includes a plurality of communication passages located on the manifold and formed to communicate with the manifold, and a plurality of valve mechanisms respectively incorporated in these communication passages. a guide block located between the valve block and the air nozzle section, and provided with a plurality of auxiliary communication passages each communicating a communication passage of the valve block with the nozzle passage. , the auxiliary communication passage is such that a portion of the valve block located on the side of the communication passage is biased in a direction opposite to an external operating portion of the valve mechanism with respect to a portion of the valve block located on the side of the nozzle passage; An air nozzle device characterized by: