RU2537708C2 - Cable input of optical socket and method of using cable input - Google Patents

Abstract

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to construction and installation of cables of optical links and is intended for use in optical socket structures. The cable input of an optical socket comprises a housing with an elongated portion stretched outwards, having an oval cross-section with a through-hole for entry of a loop of a bent cable into the socket. A ferrule is placed in the through-hole, said ferrule having channels for the cable of said loop, each channel, at least at one end of the through-hole, having a variable cross-section on the length. In the working position, the cable input together with cables in the channels of the ferrule is tightened at all sides by a sealing element which is closed around the perimeter and made of heat shrinkable material.

EFFECT: high quality of connecting cables and easier installation.

6 cl, 10 dwg

Description

The invention relates to the construction and installation of cables of optical communication lines and is intended for use in the construction of optical couplings.

A well-known sleeve for an optical cable containing a tray on which cassettes are fixed for laying the lengths of the reserve stock of optical fiber modules and protected by the splices of the splices of optical fibers, two plastic ogolovnik, each of which is made with three nozzles, a pipe in which are placed the cylindrical parts of the ogolovin and tray , and heat-shrinkable tubes for sealing the interfaces of the head-ends with the pipe and nozzles with optical cables, characterized in that it contains two U-shaped brackets fixed at a certain distance, respectively, from the first and second ends of the tray, while on the opposite ends of the bracket there are three protrusions for attaching the ends of the optical cables, the head ends are attached to the ends of the tray, and the nozzles are hermetically sealed with the possibility of opening by trimming the end, each end of the optical cable is fixed on the two ledges of the bracket. The coupling contains technological reserves of optical fiber modules that are mounted on a metal tray in the spaces between the cassettes and the brackets. The coupling contains a tray located on the pipe, on which cassettes are fixed for laying the length of the technological stock of optical fiber modules and optical fiber splices protected by sleeves, a plastic ogolovnik made with at least three nozzles, a plug, while on the one hand there is a ogolovin and, on the other hand, a plug, and heat-shrinkable tubes for sealing the interface of the headband and pipe, plugs and pipes and pipes with optical cables, characterized in that it contains a bracket azino-shaped, fixed at a certain distance from the first end of the tray, while at the opposite ends of the bracket there are three protrusions for attaching the ends of the optical cables, the headband is attached to the first end of the tray, and the nozzles are hermetically sealed with the possibility of opening by trimming the end, each end of the optical the cable is fixed on two ledges of the bracket (RU 2229147 C1, 05.20.2004; GB 2298053 A, 08.21.1996; RU 99116602 A, 07/10/2001; RU 2181496 C1, 04/20/2002 and RU 2174250 C1, 09/27/2001).

A known method of sealing the port of the optical cable coupling, in which when mounting the building lengths of the optical cables in the coupling for the output of conductors from the armor to the ground, with the output of the conductors from the armor to the ground, the spacers are separated according to the template at a distance equal to the distance between the grooves of the port of the coupling, the space between the spacers filled with a sealing compound, a conductor with gaskets is installed in the port of the lower part of the coupling body so that the gaskets enter the grooves of the coupling port, connect the lower and upper parts of the housing couplings, and gaskets with holes, the number of which is equal to the number of input grounding conductors, overlap so that the holes coincide, a grounding conductor is inserted into each hole so that one grounding conductor enters one hole and passes through both gaskets, and after this gasket is pushed according to the template to a distance equal to the distance between the grooves of the coupling port, the space between the gaskets is filled with a sealing compound, the ground conductor with gaskets is installed in the lower port the coupling body so that the gaskets fit into the grooves of the coupling port, connect the lower and upper parts of the coupling housing, providing sealing of the optical cable coupling port with the output of grounding conductors from the armor to the ground electrodes (RU 2207605 C1, 06/27/2003; RU 99116599 A, 07.20.2001; RU 2241293 C2, 11.27.2004; US 5727100, 03/10/1998; RU 2174250 C2, 09.27.2001).

A known optical connector for terminating optical fiber, comprising a housing made corresponding to the mating part and a sleeve located in the housing, the sleeve having a terminated segment of optical fiber located in its first part, the terminated segment of optical fiber including a first optical fiber installed in the tip and having a first the end located near the end surface of the tip, and the second end, while the coupling further comprises a mechanical splice located in its second part, made with possible the possibility of splicing the second end of the terminated segment of the optical fiber with the second optical fiber, the clutch additionally having a buffer clip made in its third part, the buffer clip being configured to compress at least a portion of the buffer shell of the second fiber when the clip is actuated (RU 2008114412 A, 12/10/2009).

This solution provides an optical connector containing a protective cap connected to the housing to limit lateral displacement of the second fiber, the cap having a shank made in the form of a cone, or in the form of a funnel, or in the form of movably connected segments. The protective cap further comprises a crimp ring adapted to press a fiber cable containing a second optical fiber to the carrier body, the protective cap also comprising an external protective sheath restricting the lateral displacement of the cable, and a cable crimp ring adapted to directly crimp the external protective sheath cable to reduce its possible longitudinal deformation and axial displacement of the fiber optic cable elements. The optical connector further comprises a buffer clip cuff configured to slide onto the outer surface of the third part of the coupling and actuate the buffer clip. An optical connector in which the housing has an outer shell and a frame located inside it, while the clutch is held inside the frame. An optical connector in which the buffer clip is made in the form of a compressing element with the possibility of its placement in the third part of the coupling and having the ability to crease when the buffer clip is actuated, or in the form of a corrugated outer surface of the third part of the coupling, which is wrinkled when the buffer clip is actuated, or in the form of a construction with two protrusions located inside the third part of the coupling and having parts protruding beyond the outer surface of the third part of the coupling and which are crumpled when brought into buffer clip action. The fiber-optic distribution point comprises a tray configured to be removably mounted to the fiber-optic distribution cabinet, the tray having a front surface configured to accommodate a plurality of connectors, each of the connectors being configured to install an optical connector forming an end termination of the optical fiber from the distribution line .

A method is provided for terminating an optical fiber in an optical connector, which is an optical connector, the method comprising treating the end of the optical fiber by removing a small amount of the insulating sheath of the optical fiber and chipping off the end of the optical fiber, insert the processed end of the optical fiber into the preassembled optical connector, pushing the end until until it abuts against the second end of the terminated segment of the optical fiber and the optical fiber begins to bend, the splice is activated, cf schivaya treated fiber end to a second end terminated with optical fiber segment, the buffer portion is crimped fiber in an optical fiber connector and release.

A known dead-end coupler for an optical communication cable, comprising a housing, a shell and a bracket in which cassettes with lodges are installed to fix the splice of the optical fibers of the optical cable, as well as a headband with metal and insulating plates and nozzles for inputting the connected ends of the optical cable, characterized in that the reciprocal part of the coupling body - the head end is made with large diameter nozzles into which the fittings individually assembled on an optical cable are inserted E bronezadelki QA 1, 2, 3 and 4 of a type extending from the contact plates with their fastening nodes sealed copper wires for grounding OK 1; 2; Of the 3rd type, exiting from the head of the clutch through small diameter pipes, with metal sleeves installed for fixing the contact plates to the common steel plate - electrically connect the armored knots of both spliced ends of the cable electrically through this plate, providing a tight outlet to the instrumentation from the coupling, and, at the same time, they carry out the termination of synthetic armored covers hanging OK without the conclusion of grounding wires.

The coupling contains insulating bushes for fixing the contact plates to the common metal plate; in the attachment points of the grounding wires, the armored parts are electrically isolated from each other, while each of them has its own output copper insulated wire to grounding conductors or to instrumentation, which allows for the construction of cable communication lines to divide it into separate sections of the OK, armor covers in which are electrically isolated from each other with their grounding at the ends through the output e conductors in the couplings, and thereby it is possible to reduce the magnitude of the EMF induced from the thunderstorm in the OK armor and to ensure that current pulses from the thunderstorm induced in the OK armor are removed to the ground, and without opening the coupling during operation of the cable line, it is possible to monitor the state of electrical insulation outer plastic shell OK to either side of the coupling. The coupling contains a fitting with armored assembly nodes that allow mounting OK with dissimilar armor covers and completing the third OK into an operating coupler, after which it becomes a branch coupling (RU 99125727 A, 10.10.2001).

The aforementioned known sleeves for splicing optical cables have a housing, a headband with cable entries located on it, and a housing under which there are cassettes with splices of optical fibers. To enter single cables into the sleeve, cable entries are used in the form of a round pin with a central bore (channel) in it, through which the cable is inserted into the sleeve. Two cables inserted into the sleeve through such bushings are cut to bare optical fibers, which are then spliced by welding. This splicing method is used to connect two construction lengths of cables. In this case, a branching of the optical fibers included in the third cable introduced into the sleeve by the method described above can be made in the sleeve.

However, in some cases, the branching of several optical fibers from the main cable must be done along the construction length of the cable, far from its ends. Cutting an optical cable containing a large number of fiber fibers is impractical, since welding of optical fibers is a time-consuming process and additional losses of light transmission of fibers occur during welding of fibers.

As a result, the well-known cable boxes with cable entries do not meet modern requirements to reduce the complexity and improve the quality of fiber optic cable connections.

The technical result presented in this description of the invention is to improve the quality of cable connections and reduce the complexity of installation work.

The technical result is achieved by a cable entry of an optical coupler, comprising a housing with an elongated portion elongated outwardly, having an oval cross-sectional shape with a through hole for inserting a bent cable into the loop sleeve, in which a terminal having channels for the cables of said loop is placed, each of the channels, at least at one end of it has a variable cross-section along the length, in the working position the cable entry together with the cables located in the channels of the tip is crimped from all its sides sealing, closed perimeter member made of thermosetting material.

The through hole with the side remote from the housing, in the idle position of the cable entry, contains a plug made at the same time as closing the through hole, while the plug is made with the possibility of its removal before the cable entry.

The tip is made of two detachable and docked with each other parts into one node in the working position of the cable entry. The housing is part of the coupling housing. The elongated part has a bell, the wide side facing the clutch housing.

The technical result is obtained by the method of using a cable entry of an optical coupling, in which, for introducing optical cable into each channel of the tip, the ends of the tip having a variable cross-section are cut in its transverse plane in places where the diameters of the channels correspond to the diameter of the cable.

In FIG. 1 shows a cable entry housing; in FIG. 2 is a view A in FIG. one; in FIG. 3 is a view B in FIG. one; in FIG. 4 - housing with a tip installed in it and a sealing shell made of heat-shrinkable material; in FIG. 5 is a view B in FIG. four; in FIG. 6 is a section GG in FIG. 5 (one part of the tip); in FIG. 7 is a section DD in FIG. 6; in FIG. 8 and 9 - parts of the tip; in FIG. 10 - tip in a perspective view.

The cable entry of the optical coupling includes a housing 1 with an elongated elongated part 2 having an oval cross-sectional shape with a through hole 3 for introducing a loop of a curved cable into the coupling. On the elongated part 2 of the casing, a seating surface 4 is made with a ferrule 5 (FIG. 4) installed on it, having through channels 6 and 7 (FIG. 6) for entering and passing through them loops of curved branches 8 and 9 (FIG. 4) of the cable optical communication line. Each cable branch has a plurality of optical filaments encased in a sheath 10. Each of the channels, at least at one end thereof, has a variable cross-section along its length. Since the tip 5 is located in the hole 3 of the housing, the channels 6 and 7 (Fig. 6) of the tip are located, respectively, in the hole 3 of the housing. The tip 5 is made of detachable and stacked with each other mirror parts 11, connected to one node in the hole 3 of the housing. Each of the channels of the tip 5 has at each end a conical part 12 with a variable cross section decreasing towards the end of the tip. The housing 1 and the tip 5 are hermetically crimped by a flexible sheath 13 (Fig. 4) made of heat-shrinkable material. The body and tip are made of easily cut plastic. The landing surface 4 is closed with a plug 14, made at the same time with the end wall of the housing 1 and easily cut off during installation of the input. Part 11 of the tip in their connected position (Fig. 5) form holes 15 for the location of the branches 8 and 9 of the cable (Fig. 4).

Cable entry works as follows. To use the cable entry, an optical cable is used without cutting it. For this purpose, protective sheaths are removed from the optical cable (in the place from which it is necessary to branch the fibers) over a length of about three meters before exposing their modules (tubes) in which the optical fibers are placed. Next, the beam of the optical modules is bent with a loop to the size of such a loop, which allows you to put the loop through the wide part of each of the channels of the tip 5, having at the end a conical part 12 with a variable cross section. In the through channels 6 and 7 (FIG. 6), loops of curved branches 8 and 9 are located (FIG. 4). To protect the optical modules from bending when bending their loops and to freely enter the loop into the sleeve, special means are used in the form of mandrels that define the shape and size of the loop.

Select the specified diameter of the holes 15 of the tip (Fig. 5, 6), corresponding to the diameter of each branch 8 and 9 of the cable. If the branches 8 and 9 of the input cables have diameters larger than the diameters of the holes 15, then each conical part 12 is cut off in the transverse plane of the ferrule and thereby the passage diameter of each hole 15 is increased. Next, the tip portions 11 are put on the cable branches 8 and 9. After that, cut off the plug 14 (Fig. 1) from the oval part 2 of the input and clean the landing surface 4. Enter the channel 3 tip 5 along with the branches 8 and 9 of the cable and fix it on the landing surface 4. Put on a flexible sheath 13 (Fig. 4 ) on the housing 1 and the tip 5. Heat the flexible shell 13 in a known manner, and then cool it. After cooling the shell 13, it is hermetically pressed against the surfaces of the casing and the tip, hardens to a certain extent, and assumes the static position shown in FIG. four.

The sealing of such a cable entry is carried out using a heat-shrinkable tube and thermoplastic glue applied to the point of contact of the two branches of the cable loop. The heat-shrinkable tube is converted after heating and cooling into a shell 13. The specified tube after its heating with the help of a gas burner or other tool is cooled, seated and compressed. In addition to sealing the connection, the sheath 13 performs the function of the fastener of the cable to the housing. Since the dimensions of the inlet openings 15 of the cable entry tip 5 and the outer diameter of the optical cable are different, this method of fixing the cable to the housing is not sufficiently reliable, since it does not provide sufficient fastening strength.

To increase the strength and reliability of fastening the branches of the cable loop inserted into the housing through an oval cable entry having an oval cross-sectional shape with a through hole for introducing a bent cable into the loop sleeve, both cable branches are placed in the through channels 6 and 7 of terminal 5, which fixing the cable branches in it is placed in the cavity of the oval cable entry. The placement in the through channels 6 and 7 of the lug 5 of the two cable branches is facilitated by the lug 5 made of two identical parts 11, which are joined after the cable branches are fixed in the channels 6 and 7. Since each of the channels, at least at one end, is conical and has a variable cross-sectional length, the length of the cone of the conical tip is chosen such that after trimming their excessive length, the diameter of the passage opening of each channel is approximately equal to the outer diameter of the cable. This provides a rigid fixation of the cable branches strictly in the middle of the oval passage of the cable entry. The external dimensions of the assembled lug 5 coincide in shape with the shape of the hole 3 of the oval cable entry. After placing the cable branches in the channels of the tip and placing the assembled assembly in the cable entry cavity, the cable entry is sealed by the method described above. As a result, it was possible to significantly improve the quality of cable connections and reduce the complexity of installation work.

Claims (6)

1. A cable entry of an optical coupling, characterized in that it comprises a housing with an elongated portion elongated outwardly having an oval cross-sectional shape with a through hole for inserting a curved cable into the loop sleeve, a tip installed in the oval hole having channels for cables of the specified loop, each of the channels, at least from one end thereof, having a variable cross-section along the length, the cable entry together with the cables located in the channels of the tip of the cable is located in closed circuit The input diameter of the sealing element made of heat-shrinkable material. 2. The cable entry according to claim 1, characterized in that its through hole with the side remote from the housing, in the idle position of the cable entry, contains a plug made at the same time that covers the through hole, while the plug is made with the possibility of its removal before cable entry . 3. The cable entry according to claim 1, characterized in that the tip is made of two detachable and docked with each other parts, forming one node in the working position of the cable entry. 4. The cable entry according to claim 1, characterized in that its housing is part of the coupling housing. 5. The cable entry according to claim 1, characterized in that its elongated part has a bell, the wide side facing the clutch housing. 6. The method of using the cable entry of the optical coupling according to claim 1, characterized in that for the input into each channel of the tip of the optical cables, the ends of the tip having a variable cross-section are cut in its transverse plane at places in which the diameters of the channels correspond to the diameter of the cable.

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