Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a multistage protection device and a multistage protection method for a splicing section of a fiber core of an optical fiber cable, and the multistage protection device specifically comprises the following technical scheme:
the multistage protection device for the fiber core connection section of the optical fiber cable comprises a shell, a waterproof outlet connector and a fiber connector sealing tube, wherein the shell is hollow, through holes are respectively formed in one group of opposite side surfaces of the shell, the waterproof outlet connector is fixedly arranged at the through holes, the ends to be connected of one group of the optical fiber cables enter the shell through the waterproof outlet connector respectively, the fiber connector sealing tube is fixedly arranged in the shell, and the fiber core connectors of the group of the optical fiber cables are packaged in the fiber connector sealing tube.
The shell comprises a box body and a cover plate, wherein the cover plate is fixedly attached to and covers the opening end face of the box body, an inner box body is further arranged in the box body, an optical fiber core through hole is formed in the side face of the inner box body, the optical fiber connector sealing tube is arranged in the inner box body, fiber cores of a group of optical fiber cables penetrate through the optical fiber core through holes, and the optical fiber connector is packaged in the optical fiber connector sealing tube.
Further, a circle of continuous grooves are formed in the opening end face of the box body, a sealing ring is embedded in the bottom of each groove, a circle of continuous protrusions matched with the grooves are arranged on the cover plate, the upper end face of the inner box body is flush with the upper end face of the box body, a circle of sealing strips are fixedly arranged on the upper end face of the inner box body and higher than the upper end face of the box body, after the box body is fastened and fixed with the cover plate, the protrusions abut against the sealing rings to enable the shell to form a closed space, and the sealing strips abut against the inner side face of the cover plate to enable the inner box body to form the closed space.
The optical fiber connector sealing tube comprises a box body, and is characterized in that a clamping hoop, limiting columns and clamping springs are arranged in the box body, the clamping hoop is fixedly arranged on the bottom surface of the box body and used for firmly pressing an optical fiber cable, the limiting columns are arranged in a plurality of mode, are arranged on the bottom surface of the box body at intervals and are arranged outside the inner box body and used for carding and guiding an optical fiber core, and the clamping springs are arranged inside the inner box body and used for fixing the optical fiber connector sealing tube.
Furthermore, the outer side surface of the shell is provided with a protective coating, and the protective coating is a UV coating or a fluorocarbon layer.
The waterproof outlet connector is characterized by further comprising a box body, wherein the waterproof outlet connector is integrally hollow and cylindrical, the outer side face of the waterproof outlet connector is divided into an inserting section and a locking section, the inserting section is in threaded connection with a through hole in the inner side face of the box body, the waterproof outlet connector is firmly fixed on the side face of the box body, the protection device further comprises a locking part, the locking part is arranged on the locking section and used for fastening an optical fiber cable, the locking part comprises a rubber column, a clamping mechanism and a fastening nut, the rubber column is arranged in the waterproof outlet connector and forms an installation cavity with the waterproof outlet connector, the optical fiber cable penetrates through the rubber column, the fastening nut is provided with a through hole for the optical fiber cable to penetrate through, the clamping mechanism is embedded in the installation cavity, and under the locking effect of the fastening nut, the clamping mechanism applies force to the rubber column, so that the rubber column is tightly attached to the optical fiber cable.
The clamping mechanism comprises a cylindrical body, wherein an annular shrinkage ring is arranged on the outer side face of one end of the cylindrical body, the other end of the annular shrinkage ring is embedded into a mounting cavity formed by a rubber column and a locking section, the annular shrinkage ring comprises a plurality of elastic sheets which are arranged around one end face of the cylindrical body, one end of each elastic sheet is fixedly connected with the cylindrical body, the other end of each elastic sheet is a free end, and the free ends of the elastic sheets can deform and gather inwards under the action of external force.
Furthermore, after the cylindrical body is embedded in the mounting cavity, the length of the elastic piece which is larger than or equal to 1/2 is embedded in the mounting cavity, the fastening nut and the locking section are locked and fixed through threads, and the inner diameter size of the fastening nut is smaller than the outer diameter size of the annular shrinkage ring.
Further, the outer diameter of the rubber column is smaller than the inner diameter of the waterproof outlet connector, a circle of protruding ribs are arranged at the bottom end of the rubber column, and the protruding ribs are larger than the inner diameter of the waterproof outlet connector.
Further, the optical fiber connector sealing tube comprises a tube body and a tube plug, wherein the tube body is a hollow vacuum interlayer tube, and the tube plug is fixedly arranged at two ends of the tube body and provided with through holes for penetrating optical fiber cores.
Further, the optical fiber connector sealing tube further comprises a buffer layer, and the buffer layer is arranged inside the tube body.
Furthermore, the inner pipe and the outer pipe are integrally formed, a plurality of O-shaped sealing rings are arranged on the outer side face of the pipe plug at intervals, and the buffer layer is a silica gel ball or gel.
Further, after the optical fiber core is connected, the reinforced heat shrinkage pipe is wrapped outside the optical fiber core, and the reinforced heat shrinkage pipe is arranged inside the pipe body.
Furthermore, the tube body of the optical fiber connector sealing tube and the shell are integrally manufactured by adopting one material of stainless steel, aluminum alloy or titanium alloy.
The invention also discloses a multistage protection method for the fiber core connection section of the optical fiber cable by using the protection device, which comprises the following steps:
S1, an optical fiber cable A and an optical fiber cable B to be spliced respectively penetrate through a waterproof outlet joint to enter the inside of a box body and are fixed by using a clamp;
S2, stripping the to-be-spliced ends of the optical fiber cable A and the optical fiber cable B, separating out a plurality of optical fiber cores in the to-be-spliced ends, guiding the to-be-spliced ends by using a limit column, and penetrating the to-be-spliced ends of the optical fiber cores into the inner box body;
s3, taking an optical fiber connector sealing tube, mounting a tube plug at one end of the tube plug, enabling a fiber core of the optical fiber cable A to penetrate through the tube plug, enabling the fiber core to extend out of the other end of the optical fiber connector sealing tube, and coating the optical fiber cable A by using a reinforced heat shrinkage tube;
S4, enabling the fiber core of the optical fiber cable B to pass through the other pipe plug, and completing fusion connection with the optical fiber cable A outside the optical fiber joint sealing pipe;
S5, the reinforced heat shrinkage tube completely covers the optical fiber connector, and the heat shrinkage tube is heated to complete the coating operation of the heat shrinkage tube, so that the heat shrinkage tube is tightly attached to the optical fiber connector;
S6, after injecting silica gel balls or gel into the optical fiber connector sealing tube, fixing tube plugs at two ends of the optical fiber connector sealing tube;
S7, fixing the optical fiber connector sealing tube in the inner box body through the clamp spring, covering the opening end of the box body by the cover plate, fastening and fixing by using screws, and fastening and fixing the waterproof outlet connector to the optical fiber cable.
Based on the technical scheme, the invention has the following beneficial effects:
1. The optical fiber connector is protected in a triple mode through the optical fiber connector sealing tube, the inner box body and the box body, the fused optical fibers in the device can be better protected, the fused optical fibers are prevented from being influenced by external factors, the loss of optical fiber transmission is reduced, and the reliability of optical fiber transmission information is improved. And through this multiple protection setting for this device can bear the pressure of 500m above sea water, and this device can be used for a long time under the high salt fog of island, high humidity, high temperature, high illumination and the five high environment of high radiation.
2. The box body, the inner box body and the tube body of the optical fiber joint sealing tube are all integrally manufactured by adopting stainless steel, aluminum alloy, titanium alloy and other materials. The material can enable the protective device to have the functions of corrosion resistance, pressure resistance, high temperature resistance and radiation resistance, and can avoid gaps, gaps and the like possibly occurring at the joint by integrally forming, so that the protective performance of the protective device is remarkably improved.
3. The optical fiber connector sealing tube can avoid the damage to the internal welding optical fiber, prevent the welding optical fiber from bending deformation and reduce the optical fiber loss.
Detailed Description
It should be noted that:
1. Certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will understand that a person may refer to the same component by different names. The specification and claims do not identify differences in terms of components, but rather differences in terms of the functionality of the components.
2. The terms "mounted," "disposed," "connected," and the like are to be construed broadly unless otherwise specifically defined and limited. For example, "connected" may be either permanently or detachably or integrally connected, mechanically or electrically, or directly or indirectly via an intermediate medium, or in communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
3. Unless defined otherwise, technical or scientific terms used in this disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and the like, as used in this disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.
The invention is described in detail below by way of example with reference to fig. 1-4.
The embodiment describes a multistage protection device for a fiber core connection section of an optical fiber cable, which comprises a shell 1, a waterproof outlet connector 2 and an optical fiber connector sealing tube 4.
The casing 1 includes a case 101 and a cover plate 102, and the cover plate 102 is fitted over the open end face of the case 101 and is fixed at four corners using screws.
The shell 1 is integrally made of stainless steel, aluminum alloy, titanium alloy and other materials with corrosion resistance, pressure resistance, high temperature resistance and radiation resistance, and the outer side surface of the shell 1 is also provided with a protective coating, such as a UV coating, a fluorocarbon coating and the like. The shell 1 provides a first-stage protection for the optical fibers in the shell, so that the optical fiber splicing section can work normally in island environments with high temperature, high humidity, high illumination, high salt fog and high radiation.
The open end face of the box body 101 is provided with a circle of continuous grooves, sealing rings are embedded in the grooves, and the cover plate 102 is provided with a circle of protrusions matched with the grooves. After the cover plate 102 is buckled and fixed with the box body 101, the protrusions are abutted against the sealing rings to form a sealing structure, so that moisture, salt and the like can be effectively resisted from immersing into the box body 101.
The box 101 is provided with threaded mounting holes at a set of opposite sides thereof, respectively, for mounting the waterproof outlet connector 2. Two sections of optical fiber cables 6 which need to be connected, the ends to be connected of which enter the inside of the box body 101 through the waterproof outlet connector 2 respectively, and the core connection operation is completed in the box body 101. Here, two lengths of the optical fiber cable 6, which need to be connected, may be defined as a group of optical fiber cables 6.
The waterproof outlet connector 2 is in a hollow cylindrical shape as a whole, and the outer side surface of the waterproof outlet connector is divided into an insertion section 201 and a locking section 203 by using a limit nut 202.
The insertion section 201 is provided with external threads, and the waterproof outlet connector 2 can be stably mounted at the side of the case 101 by being screw-fitted with the screw-fitting hole. The screw mounting hole is provided with a sealing ring for resisting the immersion of moisture, salt and the like into the box body 101.
The locking section 203 is used for installing a locking part, and the locking part comprises a rubber column 301, a clamping mechanism and a fastening nut 306.
The external diameter of the rubber column 301 is smaller than the internal diameter of the waterproof outlet connector 2, a circle of protruding ribs 302 are integrally formed at the bottom end of the rubber column 301, and the protruding ribs 302 are larger than the internal diameter of the waterproof outlet connector 2.
After the rubber column 301 is installed inside the waterproof outlet connector 2, the protruding ribs 302 are in interference fit inside the waterproof outlet connector 2, so that moisture is prevented from penetrating into the box body 101. A mounting cavity is formed between the column body of the rubber column 301 and the locking section, and the end face of the rubber column 301 is arranged flush with the end face of the locking section 203.
The clamping mechanism comprises a section of cylindrical body 303, an annular shrinkage ring 304 is arranged on the outer side surface of one end of the cylindrical body 303, and the other end of the cylindrical body is embedded into an installation cavity formed by the rubber column 301 and the locking section 203.
The annular shrink ring 304 is formed by arranging a plurality of elastic sheets 305 around the end face of the cylindrical body 303, one end of the elastic sheet 305 is fixedly connected with the cylindrical body 303, the other end is a free end, and the free end of the elastic sheet 305 can deform and gather inwards under the action of external force. The length of the cylindrical body 303 is set so that at least 1/2 of the length of the elastic piece 305 is fitted inside the installation cavity after the cylindrical body 303 is fitted inside the installation cavity.
The tightening nut 306 is provided with a through hole for the passage of the optical fiber cable 6. The fastening nut 306 is fastened to the locking section 203 by screw locking, and the fastening nut 306 has an inner diameter smaller than the outer diameter of the annular tightening ring 304.
In the process of screwing the fastening nut 306 to fasten the fastening nut with the locking section 203, the elastic piece 305 is forced to fold and lock the rubber column 301 in the fastening nut 306, so that the rubber column 301 is tightly attached to the optical fiber cable 6, and moisture is prevented from penetrating into the box 101.
After the to-be-spliced end of the optical fiber cable 6 passes through the threaded mounting hole on the side surface of the box body 101 and enters the box body 101, in order to keep the position of the optical fiber cable 6 stable, poor contact of a joint caused by shaking is avoided, optical fiber loss is reduced, and an optical cable fixing part is arranged in the box body 101.
The cable fixing portion includes a clip 103 and a stopper post 104.
The clamp 103 is arranged on the bottom surface of the box body 101 and is further arranged at a thread installation hole near the side surface of the box body 101, and is used for firmly pressing the optical fiber cable 6 and ensuring that the optical fiber cable 6 is firmly fixed. The clip 103 is fixedly connected to the bottom surface of the case 101, and the connection manner includes, but is not limited to, welding, screw fixation, and the like.
The limiting posts 104 are arranged in a plurality of ways, are distributed on the bottom surface of the box body 101 at intervals, are preferably arranged in a straight line, and are further arranged parallel to the side surface of the box body. The box side is the box side provided with the screw thread mounting hole.
The limit post 104 is preferably integrally formed with the box 101, and is used for carding and guiding the optical fiber, so as to avoid the optical fiber from being entangled in the box 101.
A circle of baffle plates are integrally formed on the inner bottom surface of the box body 101, the baffle plates form an inner box body 105, and the inner box body 105 is arranged between two opposite groups of limit posts 104.
The upper end face of the inner box body 105 is flush with the upper end face of the box body 101, a circle of sealing strip is fixedly arranged on the upper end face of the inner box body 105, the sealing strip is higher than the upper end face of the box body 101, and after the box body 101 is buckled and fixed with the cover plate 102, the sealing strip abuts against the inner side face of the cover plate 102, so that a closed space is formed by the inner box body 105.
The inner case 105 is provided with a fiber core through hole on a side surface for guiding the to-be-spliced end of the fiber core 601 into the inner case 105.
The inner box 105 is also made of stainless steel, aluminum alloy, titanium alloy and other materials with corrosion resistance, pressure resistance, high temperature resistance and radiation resistance, and provides a second-level protection for the optical fibers inside.
The optical fiber splice sealing tube 4 is disposed within the inner housing 105 and secured using the snap spring 5. The clamping springs 5 can provide elastic buffering, and when vibration occurs, the clamping springs 5 can maintain the stable state of the optical fiber joint sealing tube 4.
The optical fiber joint sealing tube 4 comprises a tube body 401, a tube plug 402, a buffer layer 403 and a reinforced heat-shrinkable tube 404.
The tube body 401 is a hollow tube, including an inner tube and an outer tube, between which a vacuum interlayer is formed, that is, the tube body 401 is a hollow vacuum interlayer tube.
The inner tube and the outer tube are preferably integrally formed, so that the compressive strength of the tube body 401 is further improved, and a better vacuum heat insulation effect is obtained.
The plugs 402 are installed at both ends of the pipe body 401 for blocking the openings of the pipe body 401.
The pipe plug 402 is preferably made of a silica gel material, the pipe plug 402 is provided with a through hole for the fiber core 601 to penetrate, and the outer diameter size of the pipe plug 402 is larger than the inner diameter size of the pipe body 401, so that the sealing and plugging effects of interference fit are achieved.
Further, a plurality of O-rings 405 are further disposed on the outer side surface of the plug 402 at intervals, so as to obtain a better sealing effect.
The present embodiment is not limited to the connection method of the pipe plug and the pipe body, and for example, mounting methods such as embedding and threading can be adopted.
The tube 401 is internally provided with a buffer layer 403, and the buffer layer 403 is preferably filled with silica gel pellets or gel to obtain a better elastic buffer effect.
Further, in order to have the buffering and heat-insulating effects at the same time, the buffer layer 403 is filled with the polyurethane foaming agent, and the polyurethane foaming agent has excellent heat-insulating performance, can effectively prevent heat conduction, and provides a good heat-insulating effect.
After the optical fiber is connected, the reinforced heat-shrinkable tube 404 is wrapped outside, and the reinforced heat-shrinkable tube 404 is arranged inside the tube body 401 and immersed in the buffer layer 403. The reinforced heat shrink tube 404 can closely fit around the joint of the fiber core 601, and maintain good contact of the joint.
The tube body 401 of the optical fiber connector sealing tube 4 is integrally made of stainless steel, aluminum alloy, titanium alloy and other materials with corrosion resistance, pressure resistance, high temperature resistance and radiation resistance, and provides third-level protection for the optical fiber inside.
In the present embodiment of the present invention,
1. The clamping mechanism of the locking part and the fastening nut 306 can be made of nylon 66 materials, and have high strength and anti-corrosion and waterproof effects.
2. The sealing member, such as a sealing ring, a convex strip, a sealing strip, etc., can be made of rubber material, so that the waterproof pressure of the device is equal to or greater than 10MPa.
3. In order to obtain excellent sealing and plugging effects, the pipe plug 402 is connected with the pipe body through threads, connection firmness is guaranteed, the O-shaped sealing ring is arranged in a pressing mode, the inside of the pipe plug 402 is in a conical design, and the conical sealing ring 406 is arranged and used for sealing the optical fiber and the pipe plug, and further protecting the optical fiber.
Through above-mentioned multiple protection setting for this device can bear the pressure of 500m above sea water, tolerates the high salt fog, high humidity, high temperature, high illumination of island and the five high environment of high radiation.
Based on the above-mentioned connection device, this embodiment also describes a multi-stage protection method for connecting the cores of the optical fiber cable, which includes the following steps:
S1, an optical fiber cable A and an optical fiber cable B to be spliced respectively penetrate through a waterproof outlet joint to enter the inside of a box body and are fixed by using a clamp;
s2, stripping the to-be-spliced end of the optical fiber cable A/B, separating out a plurality of optical fiber cores in the to-be-spliced end, guiding the to-be-spliced end by using a limit column, and penetrating the to-be-spliced end of the optical fiber cores into the inner box body;
s3, taking an optical fiber connector sealing tube, mounting a tube plug at one end of the tube plug, enabling a fiber core of the optical fiber cable A to penetrate through the tube plug, enabling the fiber core to extend out of the other end of the optical fiber connector sealing tube, and coating the optical fiber cable A by using a reinforced heat shrinkage tube;
S4, enabling the fiber core of the optical fiber cable B to pass through the other pipe plug, and completing fusion connection with the optical fiber cable A outside the optical fiber joint sealing pipe;
S5, the reinforced heat shrinkage tube completely covers the optical fiber connector and part of fiber cores, and the heat shrinkage tube is heated to complete the cladding operation of the heat shrinkage tube, so that the heat shrinkage tube is tightly attached to the optical fiber connector;
S6, after injecting silica gel balls or gel into the optical fiber connector sealing tube, fixing tube plugs at two ends of the optical fiber connector sealing tube;
S7, fixing the optical fiber connector sealing tube in the inner box body through the clamp spring, covering the opening end of the box body by the cover plate, fastening and fixing by using screws, and fastening and fixing the waterproof outlet connector to the optical fiber cable.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims.