CN113264666A - Method and device for connecting glass tubes - Google Patents
Method and device for connecting glass tubes Download PDFInfo
- Publication number
- CN113264666A CN113264666A CN202110178660.9A CN202110178660A CN113264666A CN 113264666 A CN113264666 A CN 113264666A CN 202110178660 A CN202110178660 A CN 202110178660A CN 113264666 A CN113264666 A CN 113264666A
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- Prior art keywords
- glass tube
- glass
- valve
- pipe
- dry gas
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- 239000011521 glass Substances 0.000 title claims abstract description 160
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 238000003466 welding Methods 0.000 claims abstract description 4
- 238000005304 joining Methods 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 101
- 238000001035 drying Methods 0.000 description 4
- 239000013307 optical fiber Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- FYSNRJHAOHDILO-UHFFFAOYSA-N thionyl chloride Chemical compound ClS(Cl)=O FYSNRJHAOHDILO-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B23/00—Re-forming shaped glass
- C03B23/20—Uniting glass pieces by fusing without substantial reshaping
- C03B23/207—Uniting glass rods, glass tubes, or hollow glassware
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Joining Of Glass To Other Materials (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention provides a method for connecting glass tubes, which is low in possibility of breakage of the glass tubes and low in possibility of adhesion of moisture contained in the atmosphere to the inside of the glass tubes when the glass tubes are connected. The method for connecting the glass tubes comprises the following steps: introducing a dry gas into a glass tube having ends connected; a step of heating the end portion by a heat source while introducing the dry gas, and welding the end portion; and a step of controlling the pressure in the glass tube to be reduced in accordance with an increase in the internal pressure of the glass tube after the connection.
Description
Technical Field
The present invention relates to a method and an apparatus for connecting glass tubes.
Background
Patent document 1 describes that when a glass tube and a Handling pipe (Handling pipe) are connected, the glass tube and the Handling pipe are melt-connected while dry gas is introduced into the pipe. Specifically, it is described that while dry gas is introduced into both tubes from the end surface of each tube on the opposite side to the connection side, the connection portion is heated and melt-connected.
Patent document 1: japanese patent laid-open publication No. 2004-238277
In the method described in patent document 1, the dry gas is discharged from the gap between the two pipes until the two pipes are connected. However, after the pipes are connected, the gap between the two pipes disappears, and therefore the dry gas cannot be discharged. As a result, the pressure in the pipe increases, and the pipe connection portion expands, and there is a possibility that the pipe connection portion may be broken.
In order to prevent the breakage of the pipe connection portion, a method of introducing the dry gas into the pipe while leaving the opening in the pipe without sealing the portion for introducing the dry gas into the pipe is considered. However, in the case of the above-described method, air may be mixed into the pipe from the opening, and moisture contained in the air may be attached to the inside of the pipe.
Disclosure of Invention
An object of the present invention is to provide a method for connecting glass tubes, which has a low possibility of breakage of the glass tubes and a low possibility of adhesion of moisture contained in the atmosphere to the inside of the glass tubes when the glass tubes are connected.
A method for connecting glass tubes according to an embodiment of the present invention includes the steps of:
introducing a dry gas into a glass tube having ends connected;
a step of heating the end portion by a heat source while introducing the dry gas, and welding the end portion; and
and a step of controlling the pressure in the glass tube to be reduced in accordance with an increase in the internal pressure of the glass tube after the connection.
A glass tube connecting device according to an aspect of the present invention includes:
a dry gas supply unit for introducing a dry gas into the glass tube having the ends connected;
a heat source for fusion-joining the end portions of the glass tubes;
a pipe connected to an end of the glass tube opposite to a side to which the pipe is connected, the pipe being capable of discharging gas inside the glass tube;
a pressure gauge provided in the pipe;
a valve provided on a downstream side of the pressure gauge; and
and a control device for controlling the valve based on information on the pressure measured by the pressure gauge.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the above-described configuration of the invention, it is possible to provide a method and a device for connecting glass tubes, which have a low possibility of breakage of the glass tubes and a low possibility of adhesion of moisture contained in the atmosphere to the inside of the glass tubes when the glass tubes are connected.
Drawings
Fig. 1 is a schematic configuration diagram showing a glass tube connecting device according to an embodiment of the present invention.
Detailed Description
[ description of embodiments of the invention ]
First, embodiments of the present invention will be described.
A method for connecting glass tubes according to an embodiment of the present invention includes the steps of:
introducing a dry gas into a glass tube having ends connected;
a step of heating the end portion by a heat source while introducing the dry gas, and welding the end portion; and
and a step of controlling the pressure in the glass tube to be reduced in accordance with an increase in the internal pressure of the glass tube after the connection.
According to the above configuration, the possibility of breakage of the glass tube becomes small, and the possibility of adhesion of moisture contained in the atmosphere to the inside of the tube becomes small.
In the method of connecting the glass tube,
preferably, the introduction of the dry gas is performed by connecting a joint to an end of the glass tube opposite to the side where the glass tube is connected, and sealing a gap between the pipe through which the dry gas is introduced and the glass tube by the joint.
According to the above configuration, the possibility that moisture contained in the atmosphere adheres to the inside of the pipe can be further reduced.
In the method of connecting the glass tube,
preferably the heat source is a burner flame.
The present invention is constructed so that dry gas is introduced and fusion-bonded together, and therefore, for example, even when using a hydrogen-oxygen burner, H is generated2In the case of the heat source of O, the possibility of water adhering to the inside of the tube can be reduced.
The method for connecting the glass tube comprises the following steps of,
preferably, a pipe capable of discharging the gas inside the glass tube is connected to an end portion of the glass tube opposite to the side where the glass tube is connected, a pressure gauge is provided in the pipe, a valve is provided downstream of the pressure gauge, and the pressure gauge and the valve are connected to a control device,
the controlling step is to detect an increase in the internal pressure of the glass tube by the pressure gauge, and the control device sends a command to the valve to open the valve in accordance with the command, thereby automatically reducing the pressure in the glass tube.
According to the above configuration, the possibility of breakage of the glass tube can be further reduced.
A glass tube connecting device according to an aspect of the present invention includes:
a dry gas supply unit for introducing a dry gas into the glass tube having the ends connected;
a heat source for fusion-joining the end portions of the glass tubes;
a pipe connected to an end of the glass tube opposite to a side to which the pipe is connected, the pipe being capable of discharging gas inside the glass tube;
a pressure gauge provided in the pipe;
a valve provided on a downstream side of the pressure gauge; and
and a control device for controlling the valve based on information on the pressure measured by the pressure gauge.
According to the above configuration, the possibility of breakage of the glass tube becomes small, and the possibility of adhesion of moisture contained in the atmosphere to the inside of the tube becomes small.
[ details of embodiments of the present invention ]
Next, an example of an embodiment of a method and a device for connecting glass tubes according to the present invention will be described with reference to the drawings. Further, the straight arrows shown in the drawings indicate the direction of the flow of the drying gas.
(means for connecting glass tubes)
First, a connection device for glass tubes according to an embodiment of the present invention will be described. Fig. 1 is a schematic configuration diagram showing a glass tube connecting device according to an embodiment of the present invention. The glass tube connecting device 1 shown in fig. 1 includes a gas supply device 11, gas lines 12a to 12e (hereinafter collectively referred to as "gas lines 12"), valves 13 to 16, a pressure gauge 17, a control device 18, and a heat source 19.
The gas supply device 11 is a device for supplying dry gas introduced into the glass tube when the glass tube is connected. The drying gas is not particularly limited, and examples thereof include an inert gas such as nitrogen, helium, or argon, a reactive gas such as chlorine or thionyl chloride, and oxygen.
The gas supply device 11 supplies a dry gas to the gas line 12. The gas line 12 includes gas lines 12a to 12 e. The gas line 12 is provided with valves 13 to 16.
The valve 13 is disposed between the gas line 12a and the gas line 12 b. By controlling the opening degree of the valve 13, for example, the flow rate of the dry gas flowing from the gas line 12a to the gas line 12b can be adjusted. Further, when the glass tubes are connected, the 1 st glass tube 21 is attached to one end of the gas line 12 b. The drying gas flowing through the gas line 12b is then introduced into the 1 st glass tube 21.
A valve 14 is disposed between the gas line 12c and the gas line 12 d. By controlling the opening degree of the valve 14, for example, the flow rate of the dry gas flowing from the gas line 12c to the gas line 12d can be adjusted. When the glass tubes are connected, the 2 nd glass tube 22 is attached to one end of the gas line 12 d. In a state where the valve 14 is opened, the drying gas flowing through the gas line 12d is introduced into the 2 nd glass tube 22.
The valve 15 is disposed between the gas line 12d and the gas line 12 e. By controlling the opening degree of the valve 15, for example, the flow rate of the dry gas flowing from the gas line 12d to the gas line 12e can be adjusted. Further, the dry gas flowing in the gas line 12e is thereafter exhausted.
The valve 16 is provided on the gas line 12 downstream of the valve 13 and branched from a position upstream of the gas line 12 b. The valve 16 is a valve for introducing a predetermined gas (for example, etching gas) into the glass tube in the step after the glass tube is connected. Thus, the valve 16 is closed when the glass tube is connected, and is opened in a predetermined step performed after the connection of the glass tube. Further, the gas line through which the gas used in the step after the glass tubes are connected is not limited to the gas line 12, and the valve 16 may be omitted in the case of the above-described configuration.
As described above, the flow path and flow rate of the dry gas in the gas line 12 can be adjusted by controlling the opening degrees of the valves 13 to 16. That is, the pressure in the glass tube can be adjusted by controlling the opening of the valves 13 to 16. The opening degree control of the valves 13 to 16 when connecting the glass tubes will be described in more detail in the following paragraphs.
The pressure gauge 17 is provided so as to be able to detect the internal pressure of the glass tube to be connected. The pressure gauge 17 may measure the pressure at a position having a pressure equivalent to the pressure in the glass tube, instead of directly measuring the pressure in the glass tube. In the example of fig. 1, the pressure gauge 17 is provided at a position where the internal pressure of the gas line 12d can be measured. The information on the internal pressure of the glass tube measured by the pressure gauge 17 is transmitted to the control device 18, for example.
The control device 18 is connected to the valves 13 to 16 and the pressure gauge 17 by wireless or wired connection. The control device 18 can control the opening degrees of the valves 13 to 16 based on the information on the pressure received from the pressure gauge 17. Further, the opening and closing of the valves 13 to 16 may be controlled by the operator by checking the pressure measured by the pressure gauge 17 without using the control device 18, but from the viewpoint of further reducing the possibility of breakage of the glass tube, it is preferable that the control device 18 controls the valves 13 to 16.
The heat source 19 is a heat source for fusion-joining the glass tubes. The heat source 19 is not particularly limited, and for example, an oxyhydrogen burner, a plasma torch, an electric furnace, or the like can be used. The method for connecting glass tubes according to the present invention performs fusion-bonding while introducing a dry gas into the glass tubes, and therefore, even when using an oxyhydrogen burner, H is generated2In the case of the heat source of O, the possibility of water adhering to the inside of the tube is also small. That is, according to the configuration of the present invention, the above-described disadvantage in the case of using an oxyhydrogen burner can be eliminated, and the advantages of using an oxyhydrogen burner that is low in cost and easy in apparatus configuration can be enjoyed.
(method of connecting glass tubes)
The method for joining glass tubes of the present invention comprises at least the steps of: step A) introducing a dry gas into the glass tube; step B) heating the end of the glass tube by a heat source while introducing a dry gas to weld the end of the glass tube; and step C) controlling the pressure in the glass tube to be reduced in accordance with an increase in the internal pressure of the glass tube after the connection.
In step a), first, a glass tube to be connected is attached to the spin chuck of the glass tube connecting apparatus 1. Then, for example, as shown in fig. 1, the end 21b of the 1 st glass tube 21 is attached to one end of the gas line 12b, and the end 22b of the 2 nd glass tube 22 is attached to one end of the gas line 12 d.
In the above mounting, as shown in fig. 1, it is preferable to mount the joint 23 on the end 21b in order to seal the gap between the end of the gas line 12b and the end 21b of the 1 st glass tube 21. Similarly, in order to seal the gap between the end of the gas line 12d and the end 22b of the 2 nd glass tube 22, it is preferable to attach the joint 24 to the end 22 b. By sealing the space between the end portion 21b and the gas line 12b and the space between the end portion 22b and the gas line 12d with the joints 23 and 24, it is possible to prevent moisture in the atmosphere from entering the glass tubes. Since the 1 st glass tube 21 and the 2 nd glass tube 22 rotate about the axial center, the joints 23 and 24 are preferably rotary joints.
The 1 st glass tube 21 and the 2 nd glass tube 22 are used, for example, for manufacturing optical fibers. In the optical fiber manufacturing application, at least one of the 1 st glass tube 21 and the 2 nd glass tube 22 may be an optical fiber product, but the other may be, for example, a dummy tube for processing. In addition, a glass rod may be used instead of one of the 1 st glass tube 21 and the 2 nd glass tube 22. That is, the present invention can be applied to the connection of a glass tube and a glass rod.
In step a), a dry gas is then supplied from the gas supply device 11 into the gas line 12. In step a), the control device 18 sends a command to the valves 13 to 16 to control the valves 13 and 14 to be opened and the valves 15 and 16 to be closed. In this state, a part of the dry gas supplied from the gas supply device 11 is introduced into the 1 st glass tube 21 through the gas lines 12a and 12b, and is continuously discharged from the gap 31 generated between the end 21a of the 1 st glass tube 21 and the end 22a of the 2 nd glass tube 22. Similarly, a part of the dry gas supplied from the gas supply device 11 is introduced into the 2 nd glass tube 22 through the gas lines 12c and 12d, and is continuously discharged from the gap 31.
In the above state, step B) is performed. That is, the end 21a of the 1 st glass tube 21 and the end 22a of the 2 nd glass tube 22 are welded to each other by heating the end 21a of the 1 st glass tube 21 and the end 22a of the 2 nd glass tube 22 with the heat source 19 while synchronously rotating the 1 st glass tube 21 and the 2 nd glass tube 22 about the axis, respectively, and introducing the dry gas into the respective glass tubes. By performing the fusion-bonding while introducing the dry gas into each glass tube as described above, it is possible to reduce the possibility that moisture contained in the atmosphere adheres to the inside of the tube. In the present invention, the fusion-connection is performed while the dry gas is ejected from the gap 31, which is a portion heated by the heat source 19, whereby the mixing of moisture from the heated portion can be effectively prevented.
In step B), the fusion joining is performed, and if the gap 31 between the end portions 21a and 22a disappears, the place where the dry gas is discharged in the 1 st glass tube 21 and the 2 nd glass tube 22 disappears. In this state, if the introduction of the dry gas is continued, the internal pressure increases, and the glass tube may be deformed or broken. In order to prevent such a situation as described above, the following step C) is performed.
In step C), first, the control device 18 detects an increase in pressure in the glass tube based on the measurement data transmitted from the pressure gauge 17. Specifically, the control device 18 detects that the internal pressures of the 1 st glass tube 21 and the 2 nd glass tube 22 exceed a predetermined threshold value based on the information on the pressure transmitted from the pressure gauge 17. The predetermined threshold value may be set as appropriate according to the type of glass tube to be connected.
Next, when the internal pressure exceeds a predetermined threshold value, the controller 18 sends commands to the valves 14 and 15 to close the valve 14 and open the valve 15. In this state, the dry gas supplied from the gas supply device 11 passes through the gas line 12a, the gas line 12b, the 1 st glass tube 21, the 2 nd glass tube 22, the gas line 12d, and the gas line 12e in this order and is exhausted to the outside. This reduces the pressure inside the glass tube, thereby preventing breakage.
In step C), the opening degree of the valve 15 may be controlled by the control device 18 so that the pressure in the glass tube is within an appropriate range (for example, 0 to 50Pa) after the valve 14 is closed and the valve 15 is opened. If the pressure in the glass tube is excessively reduced, the glass tube may be deformed by the ambient pressure, but the above-described situation can be prevented by the above-described configuration.
The valve opening/closing patterns in the glass tube connecting method according to the present embodiment described above are summarized as shown in table 1.
[ TABLE 1 ]
TABLE 1 valve opening/closing modes
| |
|
|
|
|
| In connection with | Open | Open | Close off | Close off |
| When a pressure rise is detected | Open | Close off | Open | Close off |
When the present invention is applied to the fusion-joining of the glass tube and the glass rod, for example, the supply of the dry gas may be controlled to be stopped when a pressure increase in the glass tube is detected. Further, a pipe for discharging the dry gas may be attached to an end portion of the glass tube on the side where the dry gas is introduced, and the pipe may be controlled to be opened when a pressure increase in the glass tube is detected.
While the present invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope thereof. The number, position, shape, and the like of the components described above are not limited to those of the above embodiments, and may be changed to the number, position, shape, and the like suitable for implementing the present invention.
Description of the reference numerals
1: glass tube connecting device
11: gas supply device
12a to 12 e: gas pipeline
13-16: valve with a valve body
17: pressure gauge
18: control device
19: heat source
21. 22: glass tube
23. 24: joint
31: gap
Claims (5)
1. A method of joining glass tubes, comprising the steps of:
introducing a dry gas into a glass tube having ends connected;
a step of heating the end portion by a heat source while introducing the dry gas, and welding the end portion; and
and a step of controlling the pressure in the glass tube to be reduced in accordance with an increase in the internal pressure of the glass tube after the connection.
2. The method for connecting glass tubes according to claim 1,
the introduction of the dry gas is performed by connecting a joint to an end portion of the glass tube on the side opposite to the side where the glass tube is connected, and sealing a gap between the pipe through which the dry gas is introduced and the glass tube by the joint.
3. The method for connecting glass tubes according to claim 1 or 2,
the heat source is a burner flame.
4. The method of connecting glass tubes according to any one of claims 1 to 3,
a pipe capable of discharging gas inside the glass tube is connected to an end portion of the glass tube opposite to a side where the glass tube is connected, a pressure gauge is provided in the pipe, a valve is provided downstream of the pressure gauge, and the pressure gauge and the valve are connected to a control device,
the controlling step is to detect an increase in the internal pressure of the glass tube by the pressure gauge, and the control device sends a command to the valve to open the valve in accordance with the command, thereby automatically reducing the pressure in the glass tube.
5. A glass tube connecting device, comprising:
a dry gas supply unit for introducing a dry gas into the glass tube having the ends connected;
a heat source for fusion-joining the end portions of the glass tubes;
a pipe connected to an end of the glass tube opposite to a side to which the pipe is connected, the pipe being capable of discharging gas inside the glass tube;
a pressure gauge provided in the pipe;
a valve provided on a downstream side of the pressure gauge; and
and a control device for controlling the valve based on information on the pressure measured by the pressure gauge.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020-023304 | 2020-02-14 | ||
| JP2020023304A JP7375600B2 (en) | 2020-02-14 | 2020-02-14 | Glass pipe connection method and connection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113264666A true CN113264666A (en) | 2021-08-17 |
Family
ID=77228095
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110178660.9A Pending CN113264666A (en) | 2020-02-14 | 2021-02-09 | Method and device for connecting glass tubes |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP7375600B2 (en) |
| CN (1) | CN113264666A (en) |
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| JP2021127276A (en) | 2021-09-02 |
| JP7375600B2 (en) | 2023-11-08 |
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