CN210109425U - Flexible water pressure resistant single-core optical cable connection protection device of fiber grating sensor - Google Patents
Flexible water pressure resistant single-core optical cable connection protection device of fiber grating sensor Download PDFInfo
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- CN210109425U CN210109425U CN201921226302.5U CN201921226302U CN210109425U CN 210109425 U CN210109425 U CN 210109425U CN 201921226302 U CN201921226302 U CN 201921226302U CN 210109425 U CN210109425 U CN 210109425U
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Abstract
The utility model discloses a single core optical cable protection device that continues of flexible water pressure-resistant fiber grating sensor, including flexible section and be used for two fastening sections of symmetric connection at flexible section both ends, flexible section includes spiral metal pillar, metal mesh grid, flexible sheath, and flexible sheath is used for wrapping up at least outside flexible section and fastening section handing-over department, and the fastening section includes metal sleeve, O type circle, metal gasket, clamp bolt, and metal sleeve is used for with spiral metal pillar welded connection. The utility model discloses the spiral steel pillar that well flexible section adopted, metal mesh grid, take and glue pyrocondensation sheath and be flexible material, consequently flexible section both possesses the not destroyed intensity of protecting butt fusion section tail cable, and the tail cable of being convenient for again walks the line in engineering application and lays, adapts to multiple construction environment. The stainless steel sleeve is connected with the compression bolt through threads, and the compression bolt extrudes the O-shaped ring through the steel gasket to generate deformation, so that the tail cable can be fixed and the waterproof and pressure-resistant performance is good.
Description
Technical Field
The utility model belongs to the technical field of geotechnical engineering safety monitoring device, a fiber grating instrument connection protection device is related to, and more specifically the utility model relates to a single core optical cable protection device that continues of flexible water pressure resistant fiber grating sensor.
Background
The fiber grating instrument is used as a novel sensor and widely applied to safety monitoring of building structures such as geotechnical engineering, bridges, highways and the like. Because of the advantages of long signal transmission distance, strong anti-electromagnetic interference capability and the like, the fiber grating instrument has become the first choice instrument for safety monitoring of high-water-head and long-distance hydraulic tunnels and reservoir dam structures.
In the use process of the fiber bragg grating instrument, the sensor 1 and the observation end 2 need to be connected through a single-core tail cable 3, and the structure of the fiber bragg grating instrument is shown in figure 1. The single-core pigtail cable 3 is configured as shown in fig. 2, and includes a pigtail cable protective sheath 301, an optical fiber cladding 302, and an optical fiber 303 from outside to inside. The optical fiber used by the fiber grating instrument is a single-mode optical fiber, the essence of the optical fiber is glass fiber with the diameter of 8-10 mu m, and in the actual engineering application, the tail cable of the instrument is easy to be damaged, so that the sensor fails. The splicing of the instrument tail cable needs to be carried out, the schematic diagram is shown in fig. 3, a stainless steel reinforcing needle 5 is used for reinforcing at a welding point 4, and a heat-shrinkable sleeve 6 is sleeved outside the welding point 4 for protection.
After fusion splicing, a weak link for protecting the optical fiber is formed between the two sections of the tail cables, so that the optical fiber is easily broken again. The existing reinforcing needle and sleeve cannot achieve a good protection effect. The fiber grating instrument is mostly used in a high-water head pressure environment, and hydrogen ions ionized from a water body can cause chapping of the surface of an optical fiber and influence the service life of the sensor, so that the protection device needs to have a certain waterproof and pressure-resistant function. In geotechnical engineering safety monitoring, the fiber grating instrument is buried in the installation environment complicated and changeable, mostly in concrete lining, instrument buried hole, precast concrete segment, its tail cable is walked in all kinds of protection tubes. If the welding section is protected by rigid materials such as stainless steel pipes, the length of the welding section is at least 20cm, great inconvenience is caused to tail cable routing, and risks such as bending and breaking of a protection pipe are avoided. Therefore, the development of a flexible single-core tail cable fusion section protection device is urgently needed in the practical engineering application of the fiber grating instrument.
Disclosure of Invention
In order to solve the problem, the utility model discloses a single core tail cable butt fusion protection device of fiber grating instrument adopts flexible material to protect, and has good waterproof pressure resistance.
In order to achieve the above purpose, the utility model provides a following technical scheme:
a flexible water pressure resistant single-core optical cable connection protection device of an optical fiber grating sensor comprises a flexible section and two fastening sections which are symmetrically connected to two ends of the flexible section, wherein the flexible section comprises a spiral metal protective pipe, a metal woven mesh and a flexible sheath, the spiral metal protective pipe is used for being sleeved outside a tail cable optical fiber fusion point, the metal woven mesh is used for wrapping the spiral metal protective pipe, the flexible sheath is used for wrapping at least the flexible section metal woven mesh and the junction of the flexible section and the fastening sections, the fastening sections comprise metal sleeves, O-shaped rings, metal gaskets and compression bolts, the metal sleeves are used for being welded and connected with the spiral metal protective pipe, the O-shaped rings are used for being arranged at one end, close to the spiral steel protective pipe, in the stainless steel sleeve, the compression bolts are provided with through holes for accommodating tail cables, external threads are arranged on the outer walls of the compression bolts, internal threads are arranged in the metal sleeves, the metal sleeve and the compression bolt can be connected through threads, and the metal gasket is arranged between the compression bolt and the O-shaped ring.
Furthermore, the aperture of the compression bolt and the inner diameter of the O-shaped ring are equal to the outer diameter of the tail cable.
Furthermore, the compression bolt is connected with the metal sleeve through threads, and the compression bolt extrudes the O-shaped ring through the steel gasket to enable the O-shaped ring to deform.
Further, the spiral metal protective pipe is a spiral steel protective pipe.
Further, the flexible sheath is a heat-shrinkable sheath with glue.
Further, the metal sleeve is a stainless steel sleeve.
Further, the metal gasket is a steel gasket.
Furthermore, the stainless steel sleeve and the head of the compression bolt are both hexagonal.
Compared with the prior art, the utility model has the advantages of as follows and beneficial effect:
1. the utility model provides a spiral steel pillar, metal mesh grid, the pyrocondensation sheath of taking to glue that flexible section adopted among the flexible water pressure resistant fiber grating sensor single core optical cable protection device that continues are flexible material, and the protection device flexible section that constitutes from this both possesses certain intensity, can protect the butt fusion section tail cable not destroyed, can adapt to various complicated construction environment again, and the tail cable of being convenient for walks the line and lays in the engineering is used.
2. The stainless steel sleeve and the compression bolt of the fastening section are connected through threads, the compression bolt extrudes the O-shaped ring through the steel gasket, the inner diameter of the O-shaped ring is consistent with the outer diameter of the tail cable, and the O-shaped ring can deform when being extruded, so that the functions of fixing the tail cable and preventing water and pressure are realized. Therefore, the protection device has a good waterproof and pressure-resistant function, can be suitable for a high-water-head pressure environment, and effectively prolongs the service life of the fiber grating instrument.
3. The whole protection device is of a mechanical assembly structure, is convenient to install, can be disassembled for maintenance and can be repeatedly used.
Drawings
Fig. 1 is a schematic structural diagram of a fiber grating sensor.
Fig. 2 is a schematic view of a tail cable structure.
FIG. 3 is a schematic diagram of the fusion splicing of the fiber grating instrument pigtail cable.
Fig. 4 is a partial sectional view of the overall structure of the protector.
Fig. 5 is a partial sectional view of the protector in its entirety assembled.
Fig. 6 is a partial cross-sectional view of a flexible segment of the protective device.
Fig. 7 is a structural section view of the fastening section A.
Fig. 8 is a structural section view of the fastening section B.
Fig. 9 is a schematic view of a construction of a press bolt, in which (a) is a side sectional view and (b) is a left side view of (a).
Fig. 10 is a schematic view of the protector assembly.
Description of reference numerals:
Detailed Description
The present invention will be further explained with reference to the accompanying drawings and embodiments, which are to be understood as illustrative only and not limiting the scope of the invention. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
The utility model provides a single core optical cable protection device that continues of flexible water pressure-resistant fiber grating sensor, as shown in fig. 4, fig. 5, including fastening section A, flexible section C, fastening section B three-section, flexible section C is protection device's main part, and fastening section A, fastening section B connect respectively at flexible section C's both ends, play fixed tail cable and waterproof withstand voltage's effect.
The flexible section C sequentially comprises a spiral steel protective pipe 7, a metal woven mesh 8 and a heat-shrinkable sheath 9 with glue from inside to outside, as shown in fig. 4, 5 and 6, the spiral steel protective pipe 7 is formed by twisting thin steel strips into a spiral shape, the spiral steel protective pipe is sleeved outside the optical fiber fusion point, and the spiral steel protective pipe 7 has certain elasticity and can be bent. The material of the protective tube can be replaced by other metal materials which can be bent and twisted. The metal mesh grid sets up outside spiral steel pillar, and it is the flexible material that can bend also, and adopts the metal because of the material, and the structure adopts fine and close netted, has certain intensity, and barrier propterty is good. The rubber heat-shrinkable sheath 9 is sleeved outside the metal woven mesh and is also made of a bendable flexible material.
The fastening section A and the fastening section B are of the same structure and are symmetrically arranged. As shown in fig. 7 and 8, each of the fastening sections a and B includes a stainless steel sleeve 10, an O-ring 11, a steel gasket 12, and a compression bolt 13. The stainless steel sleeve 10 (the sleeve can also be made of other metal materials which are not easy to rust) is welded with the spiral steel protective pipe 7 in the flexible section C, the heat shrinkable sheath with the rubber is heated to wrap the joint of the stainless steel sleeve and the spiral steel protective pipe, and a part of the stainless steel sleeve is covered, so that the sealing performance is ensured. The O-shaped ring is arranged at one end, close to the spiral steel protective pipe, in the stainless steel sleeve 10, the compression bolt is of a structure as shown in (a) and (b) in figure 9, the middle part of the compression bolt penetrates through the hole structure, the hole diameter is equal to the outer diameter of the tail cable, and the inner diameter of the O-shaped ring is equal to the outer diameter of the tail cable. Be provided with internal thread 1001 in the stainless steel sleeve, the housing bolt outer wall is provided with external screw thread 1301, and stainless steel sleeve and housing bolt pass through threaded connection. The steel gasket 12 (the gasket can also be made of other metal materials) is arranged between the compression bolt 13 and the O-shaped ring 11, and the compression bolt extrudes the O-shaped ring through the steel gasket to play the functions of fixing the tail cable and resisting water and pressure. The stainless steel sleeve and the head of the compression bolt are both in an outer hexagonal shape, so that a wrench is convenient to assemble and fasten, and the overall appearance after assembly is as shown in figure 10.
The utility model provides a flexible water pressure resistant fiber grating sensor single core optical cable protection device's installation goes on according to following step:
1. sequentially passing 1 of 2 tail cables to be connected through a compression bolt, a steel gasket, an O-shaped ring and a flexible section of the fastening section A;
2. sequentially passing the other 1 tail cable to be connected through the compression bolt, the steel gasket and the O-shaped ring of the fastening section B;
3. carrying out optical fiber fusion operation;
4. placing the optical fiber fusion splicing section on the flexible section, and assembling and fastening the fastening sections at two ends;
5. and pulling the tail cable to test whether the connection is firm.
The technical means disclosed by the scheme of the present invention is not limited to the technical means disclosed by the above embodiments, but also includes the technical scheme formed by the arbitrary combination of the above technical features. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also considered as the protection scope of the present invention.
Claims (8)
1. The utility model provides a single core optical cable protection device that continues of flexible water pressure resistant fiber grating sensor which characterized in that: the flexible section comprises a flexible section and two fastening sections which are symmetrically connected to two ends of the flexible section, the flexible section comprises a spiral metal protective pipe, a metal woven mesh and a flexible sheath, the spiral metal protective pipe is used for being sleeved outside a fusion point of a tail cable optical fiber, the metal woven mesh is used for being wrapped outside the spiral metal protective pipe, the flexible sheath is used for being wrapped outside at least the flexible section metal woven mesh and the junction of the flexible section and the fastening sections, the fastening sections comprise metal sleeves, O-shaped rings, metal gaskets and compression bolts, the metal sleeves are used for being welded with the spiral metal protective pipe, the O-shaped rings are used for being arranged at one end close to the spiral steel protective pipe in the stainless steel sleeve, the compression bolts are provided with through holes for accommodating the tail cable, the outer walls of the compression bolts are provided with external threads, the metal sleeves are internally provided with internal threads, and the metal sleeves and the compression bolts, the metal gasket is used for being arranged between the compression bolt and the O-shaped ring.
2. The flexible water pressure resistant optical fiber grating sensor single-core optical cable splicing protection device according to claim 1, characterized in that: the hole diameter of the compression bolt and the inner diameter of the O-shaped ring are equal to the outer diameter of the tail cable.
3. The flexible water pressure resistant optical fiber grating sensor single-core optical cable splicing protection device according to claim 1 or 2, characterized in that: the compression bolt is connected with the metal sleeve through threads, and the compression bolt extrudes the O-shaped ring through the steel gasket to enable the O-shaped ring to deform.
4. The flexible water pressure resistant optical fiber grating sensor single-core optical cable splicing protection device according to claim 1, characterized in that: the spiral metal protective pipe is a spiral steel protective pipe.
5. The flexible water pressure resistant optical fiber grating sensor single-core optical cable splicing protection device according to claim 1, characterized in that: the flexible sheath is a heat-shrinkable sheath with glue.
6. The flexible water pressure resistant optical fiber grating sensor single-core optical cable splicing protection device according to claim 1, characterized in that: the metal sleeve is a stainless steel sleeve.
7. The flexible water pressure resistant optical fiber grating sensor single-core optical cable splicing protection device according to claim 1, characterized in that: the metal gasket is a steel gasket.
8. The flexible water pressure resistant optical fiber grating sensor single-core optical cable splicing protection device according to claim 1, characterized in that: the stainless steel sleeve and the head of the compression bolt are both hexagonal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921226302.5U CN210109425U (en) | 2019-07-31 | 2019-07-31 | Flexible water pressure resistant single-core optical cable connection protection device of fiber grating sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921226302.5U CN210109425U (en) | 2019-07-31 | 2019-07-31 | Flexible water pressure resistant single-core optical cable connection protection device of fiber grating sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210109425U true CN210109425U (en) | 2020-02-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921226302.5U Active CN210109425U (en) | 2019-07-31 | 2019-07-31 | Flexible water pressure resistant single-core optical cable connection protection device of fiber grating sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210109425U (en) |
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2019
- 2019-07-31 CN CN201921226302.5U patent/CN210109425U/en active Active
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