CN201952354U - Optical fiber preform - Google Patents
Optical fiber preform Download PDFInfo
- Publication number
- CN201952354U CN201952354U CN2011200009347U CN201120000934U CN201952354U CN 201952354 U CN201952354 U CN 201952354U CN 2011200009347 U CN2011200009347 U CN 2011200009347U CN 201120000934 U CN201120000934 U CN 201120000934U CN 201952354 U CN201952354 U CN 201952354U
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- CN
- China
- Prior art keywords
- preform
- optical fiber
- prefabricated rods
- groove
- quartz pushrod
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Abstract
An optical fiber preform relates to the manufacturing technology of optical fibers. A groove is formed at one end part of the optical fiber preform. The utility model has the benefits that the optical fiber preform can effectively prevent the preform from slipping during fiber drawing, and even though the preform slides down due to the difference of the thermal expansion coefficient, a clamping mechanism arranged in the groove can prevent the preform and a quartz rod from continuously sliding down.
Description
Technical field
The utility model relates to optic fibre manufacturing technology.
Background technology
At present, optical fiber mainly is the preparation by prefabricated rods, at high temperature draws to optical fiber again.The prefabricated rods diameter less than 200mm length during less than 3000mm the optical fiber manufacturing generally adopt the silica tube welding on prefabricated rods, and be clamped on the silica tube and prefabricated rods sent into the wire drawing of graphite furnace internal heating.Development and raising along with optic fibre manufacturing technology, for reducing production costs, preform diameter and length are increasing, the weight of corresponding its prefabricated rods is also increasing, the wire drawing time is also more and more longer, manufacturers progressively adopts quartz pushrod to replace silica tube, because the heat seal strength of quartz pushrod and prefabricated rods is much larger than the heat seal strength of silica tube and prefabricated rods.
But because quartz pushrod is not easy heat radiation than silica tube, the wire drawing time of single prefabricated rods increases.When graphite furnace heating prefabricated rods, heat is transmitted on the quartz pushrod and by quartz pushrod by prefabricated rods and is transmitted on the clamping device, and the material that clamping device is used is a steel.Because the thermal expansivity of steel is 20～100 ℃: 11.59e-6/ ℃
20～200℃：12.32e-6/℃
20～300℃：13.09e-6/℃
20～400℃：13.71e-6/℃
20～500℃：14.18e-6/℃
20～600℃：14.67e-6/℃
And quartzy thermal expansivity is that 5.5e-7/ ℃ of thermal expansivity between the two do not match, and causes quartz pushrod landing in the anchor clamps to cause the financial losses such as damage of graphite furnace inner part and prefabricated rods when temperature variation easily, as Fig. 1,2,3.
The utility model content
Technical problem to be solved in the utility model is, the deficiency at above-mentioned prior art exists provides a kind of quartz pushrod, the quartz pushrod landing in the anchor clamps of prefabricated rods that can prevent welding.
The utility model solve the technical problem the technical scheme that is adopted, and preform is characterized in that, is provided with groove in the end.
Further, described groove is the ring-type setting.
The beneficial effects of the utility model are, can effectively prevent the landing of prefabricated rods in the drawing process, glide even produce because of difference of thermal expansion coefficients causes prefabricated rods, and the clamping device of groove also can stop prefabricated rods and quartz pushrod to continue to glide.
Description of drawings
Fig. 1 is the structural representation of existing fiber prefabricated rods.
Fig. 2 causes preform structural representation during landing in anchor clamps because of difference of thermal expansion coefficients.
Fig. 3 is the enlarged diagram of the A part of Fig. 2.
Fig. 4 is a structural representation of the present utility model.
Fig. 5 is that the utility model stops the synoptic diagram that causes preform landing in the anchor clamps because of difference of thermal expansion coefficients.
Fig. 6 is the B part enlarged diagram of Fig. 5.
Embodiment
Referring to Fig. 4～6, the utility model is the prefabricated rods 3 that has quartz pushrod 2.Quartz pushrod 2 is arranged on the end of prefabricated rods 3, and anchor clamps 1 are clamped on the groove of quartz pushrod 2, and groove is the ring-type setting.When because the thermal expansivity difference causes quartz pushrod 2 and prefabricated rods 3 in anchor clamps 1 during landing, the upper limb of the groove on the quartz pushrod is stuck in the downglide motion that can stop prefabricated rods 3 and quartz pushrod 2 on the anchor clamps upper surface.
Claims (3)
1. preform is characterized in that, is provided with groove in the end.
2. preform as claimed in claim 1 is characterized in that, described groove is the ring-type setting.
3. preform as claimed in claim 1 is characterized in that the end of described prefabricated rods has quartz pushrod, and groove is arranged on the quartz pushrod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200009347U CN201952354U (en) | 2011-01-05 | 2011-01-05 | Optical fiber preform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200009347U CN201952354U (en) | 2011-01-05 | 2011-01-05 | Optical fiber preform |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201952354U true CN201952354U (en) | 2011-08-31 |
Family
ID=44496476
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200009347U Expired - Lifetime CN201952354U (en) | 2011-01-05 | 2011-01-05 | Optical fiber preform |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201952354U (en) |
-
2011
- 2011-01-05 CN CN2011200009347U patent/CN201952354U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110831 |