A fiber optic cable down-lead sealing device

Abstract

This application belongs to the field of power optical cable laying equipment, specifically relating to an optical cable downlead sealing device. It includes several splicing modules and a first cavity penetrating the middle of the splicing modules. The key feature is that an elastic liner is provided within the cavity, fitting snugly against the cavity. A second cavity is formed through the center of the elastic liner. The splicing modules are fixed in relative position by any of the following methods: fastening, riveting, or bolting. The elastic liner, such as elastic plastic, located within the first cavity, conforms to the shape of the outer shell, providing excellent protection for the optical cable. Furthermore, the elastic liner located below the cavity can also tightly fit the galvanized steel pipe, achieving a tight and elastically protective downlead sealing.

Description

Technical Field

[0001] This application belongs to the field of power optical cable laying equipment, specifically relating to an optical cable lead-down sealing device. Background Technology

[0002] Optical cable downlead sealing refers to the sealing of pipes, holes, or gaps through which optical cables pass when they are introduced from outdoors into indoors or into equipment rooms. This is done to prevent external factors such as water, dust, pests, and gases from entering the room or equipment, thus protecting the safe operation of the optical cables and related equipment.

[0003] Chinese invention patent CN202510031928.4 discloses an optical cable downlead sealing device, comprising:

[0004] The housing includes two interlocking left and right halves. At the same end of the left and right halves, a first semi-circular groove is provided for tight fitting with the optical cable. At the other end of the left and right halves, a second semi-circular groove is provided for fitting with a steel pipe fitted on the outside of the optical cable. After the left and right halves are interlocked, the two first semi-circular grooves combine to form a first circular hole suitable for the optical cable to pass through, and at the same time, the two second semi-circular grooves combine to form a second circular hole suitable for the steel pipe to pass through.

[0005] The first sealing assembly consists of multiple components, each connected to one end of the left half-shell and the right half-shell near the first semi-circular groove. After the left half-shell and the right half-shell are mated together, the multiple first sealing assemblies are combined to form a circle and are arranged around the optical cable. The first sealing assembly is used to seal the gap between the shell and the optical cable.

[0006] In one possible implementation, the first sealing component includes:

[0007] A vertical plate, one end of which is connected to the end of the housing near the first semi-circular groove, and a screw hole in the middle of the vertical plate;

[0008] The first set screw passes through the screw hole and is threaded into the screw hole;

[0009] The first arc-shaped seal is arc-shaped and used to seal the gap between the inner wall of the housing and the optical cable, with its protruding side facing the first set screw.

[0010] The first bearing component is connected to the middle of one side of the arc-shaped protrusion of the first arc-shaped seal. The inner end of the first set screw is rotatably connected to the first bearing component. Tightening the first set screw is used to push the first arc-shaped seal to move radially along the optical cable to seal the gap between the inner wall of the housing and the optical cable. The ends of two adjacent first arc-shaped seals abut against each other. Multiple first arc-shaped seals are combined to form a circle and surround the optical cable.

[0011] In the aforementioned existing technologies, the main outer shell serves as the initial protective covering, and the sealing element is tightened against the optical cable or galvanized steel pipe using set screws. However, all the set screws are relatively small and prone to corrosion during long-term weathering. Furthermore, the sealing device requires regular maintenance and replacement, which undoubtedly increases the difficulty of maintenance. In addition, this structure contains many components, requiring a considerable amount of installation time. Utility Model Content

[0012] The technical problem to be solved by this application is to provide a fiber optic cable down-lead sealing device with a simpler structure that is more suitable for replacement, maintenance, and quick installation.

[0013] Technical Solution: To solve the above-mentioned technical problems, this application provides a new technical solution:

[0014] A fiber optic cable downlead sealing device includes several splicing modules and a first cavity penetrating the middle of the splicing modules. The device is characterized in that an elastic liner is disposed within the cavity, the elastic liner fitting snugly against the cavity, and a second cavity penetrating the middle of the elastic liner.

[0015] The splicing modules are fixed in relative position using any of the following methods: snap-fit, riveting, or bolting. An elastic liner, such as elastic plastic, placed within the first cavity perfectly fits the outer shell, providing excellent protection for the optical cable. Furthermore, the elastic liner located below the cavity also fits tightly against the galvanized steel pipe, achieving a tight, secure, and elastically protective bottom-entry seal.

[0016] Furthermore, to simplify the structure, the device may include two symmetrically shaped main shells. After the two main shells are joined together, the upper part of the shell is hemispherical, conical, or parabolic, and the lower part is semi-cylindrical or polygonal. A first cavity is formed through the middle of the shell along its central axis, and the upper part of the first cavity is smaller than its lower part. After installing the elastic liner, the upper part is used to clamp the optical cable, and the lower part is used to clamp the galvanized steel pipe.

[0017] Furthermore, the device features a split-type structure, with each splicing unit consisting of two opposing main shells. The main shells are rotated and cut along their central axes to form a first cavity. The sidewalls of the first cavity are arranged with a series of grooves along the axial direction. This groove design prevents longitudinal displacement of the internal elastic liner.

[0018] Furthermore, the opposing surfaces of the two main outer shells are the contact surfaces when they are spliced ​​together. Mounting grooves are made on the contact surfaces for installing elastic inner liners. The elastic inner liners are located above and below the first cavity, respectively. Connecting parts are located on both sides of the elastic inner liners to connect the upper and lower elastic inner liners. A certain amount of space is left at the critical point where the optical cable enters the galvanized steel pipe to prevent damage caused by unidirectional compression of the elastic inner liners, which would force the optical cable towards the outer edge of the galvanized steel pipe.

[0019] Furthermore, the first cavity includes an upper cavity with a small aperture and a lower cavity with a large aperture, and the sidewalls of both the upper and lower cavities are arrayed with several grooves.

[0020] A transition cavity is provided between the upper cavity and the lower cavity. The upper cavity is used to place the optical cable, the lower cavity is used to place the galvanized steel pipe, and the transition cavity is located where the optical cable enters the galvanized steel pipe.

[0021] Furthermore, near the edge of the first cavity, the bottom surface of the mounting groove is lower than the contact surface, while the periphery of the transition cavity is flush with the contact surface. This allows the elastic liner to fit over the protrusion centered on the transition cavity, with both the upper and lower sides embedded in the upper and lower cavities. Combined with the groove within the first cavity, this makes the elastic liner more stable.

[0022] Furthermore, the elastic liner has the same shape as the corresponding cavities at the upper and lower cavities, and several clamping protrusions are also formed on the inner wall of the second cavity formed in the middle of the elastic liner. The parallel clamping protrusions can provide more elastic margin during clamping, thereby improving the tightness of clamping.

[0023] Furthermore, corresponding positioning shafts and positioning holes are respectively provided on the contact surface. The positioning shafts and positioning holes are respectively located on the diagonal of the contact surface, that is, several positioning shafts are respectively set on the same diagonal. Then, with the central axis as the center line, a corresponding number of positioning holes are set symmetrically with the positioning shafts. The positioning shafts / holes designed in this way only need to be processed and formed in one go, without the need to distinguish between left and right shells. Every two shells can be fitted together, which not only reduces production costs but also reduces subsequent maintenance and replacement costs.

[0024] Furthermore, connecting seats are provided on both sides of the main body shell, with holes in the center of the connecting seats for connecting bolts. The plane near the center of the connecting seat is lower than the contact surface. The contact surface will wear during use, so designing the connecting seat lower than the contact surface provides a certain wear allowance and increases its service life.

[0025] Furthermore, the seam between the two main body shells is integrally or detachably equipped with interlocking fasteners. Specifically, the two shells can be designed with slots and inserts, and the inserted parts are bent upwards to further improve water drainage performance.

[0026] The beneficial effects of this application are as follows:

[0027] The modular design (such as two symmetrical main shells) reduces the number of parts and makes the installation process simpler and shorter than the complex set screws and multi-component structures in existing technologies.

[0028] The split-type structure and positioning shaft / hole design make the housing highly adaptable, eliminating the need to distinguish between left and right housings and reducing the complexity of production and installation.

[0029] The universal design of the positioning shaft and positioning hole (diagonally distributed and machined in one piece) makes the housing highly adaptable, reduces the types of spare parts, and lowers maintenance and replacement costs.

[0030] The elastic liner fits into the groove, ensuring a secure installation and easy disassembly for regular inspection and replacement.

[0031] The elastic liner (such as elastic plastic) fits perfectly into the first cavity, tightly clamping the optical cable and galvanized steel pipe, providing excellent waterproof, dustproof, and insect-proof protection.

[0032] The clamping protrusions of the elastic liner increase clamping tightness and elastic margin, ensuring reliable sealing during long-term use.

[0033] Interlocking edges (integrated or detachable) and embedded waterproof design further enhance waterproof performance and adapt to harsh environments such as wind and rain erosion.

[0034] The elastic liner has an elastic protective function, which can buffer external impacts and prevent the optical cable from being damaged by compression or vibration.

[0035] The transition cavity design provides space at the critical point where the optical cable enters the galvanized steel pipe, preventing damage caused by unidirectional compression that could cause the optical cable to be pressed against the outer edge of the steel pipe.

[0036] The cavity groove design prevents longitudinal displacement of the elastic liner, ensuring stability during long-term use.

[0037] The connector is designed to be lower than the contact surface, providing a wear allowance and extending the service life of the device.

[0038] The highly versatile positioning shaft / hole design and symmetrical housing structure simplify mold design and production process, and reduce manufacturing costs.

[0039] The splicing modules are connected by snap-fitting, riveting, or bolting, which allows for flexible production and the selection of an economical method based on needs.

[0040] The first cavity is divided into an upper cavity (small aperture, for holding optical cables), a lower cavity (large aperture, for holding galvanized steel pipes), and a transition cavity, which can accommodate optical cables and steel pipes of different sizes and have a wide range of applications.

[0041] The flush design of the mounting slot and transition cavity makes the elastic liner more securely embedded and adaptable to a variety of installation environments. Attached Figure Description

[0042] Figure 1 This is a front view of the main body shell of Embodiment 1 of this application;

[0043] Figure 2 This is a perspective view of the main body shell of Embodiment 1 of this application;

[0044] Figure 3 This is a perspective view of the elastic liner of Embodiment 1 of this application;

[0045] Figure 4 This is a schematic diagram of the assembly of the elastic inner liner and the main outer shell according to Embodiment 1 of this application;

[0046] Figure 5 for Figure 4 Internal structure diagram;

[0047] Figure 6 This is a schematic diagram showing the positional relationship between the two elastic inner linings and one side of the inner core after they are bonded together according to Embodiment 1 of this application;

[0048] Figure 7 This is an overall schematic diagram of Embodiment 1 of this application;

[0049] Figure 8 This is a schematic diagram of the elastic liner in Embodiment 2 of this application;

[0050] Figure 9 This is a schematic diagram of the left main body shell of Embodiment 3 of this application;

[0051] Figure 10 This is a schematic diagram of the right main body shell of Embodiment 3 of this application;

[0052] Figure 11 This is a schematic diagram of the connection between the left and right main body shells in Embodiment 3 of this application.

[0053] In the diagram: 1. Main body shell; 2. Contact surface; 3. Upper cavity; 4. Lower cavity; 5. Elastic liner; 6. Mounting groove; 7. Positioning shaft; 8. Positioning hole; 9. Connecting seat; 10. Corrugated structure; 11. Embedded tongue; 12. Outward protrusion; 13. Embedded groove. Detailed Implementation

[0054] Example 1:

[0055] like Figure 1-7 As shown, a fiber optic cable downlead sealing device includes a main outer shell 1 with a half-shaped symmetrical structure, the shape of which is referenced. Figure 1 , Figure 2The upper part is a quarter sphere, and the lower part is tangentially connected to a semi-cylinder. Its front side is the contact surface 2. The first cavity is formed by rotating and cutting around the central axis of the contact surface 2. The upper part of the first cavity is the upper cavity 3, the middle part is the overwintering cavity, and the lower part is the lower cavity 4. From top to bottom, the diameters of the three cavities increase sequentially.

[0056] Reference Figure 1 The upper front view or sectional view of the transition cavity shows an arc-shaped section, which becomes a hemispherical shape after assembly, and the lower part is a hollow cylinder. Grooves are opened along the axial direction on the inner walls of the upper cavity 3 and the lower cavity 4 for embedding the elastic liner 5.

[0057] On the contact surface 2, a portion of the outer edge of the main body shell 1, outside the transition cavity, is cut off to form a mounting groove 6, which is also used to embed the elastic liner 5.

[0058] Reference Figure 1 / 2, the upper left corner of the part of the contact surface 2 that has not been cut off is positioned by the positioning shaft 7, and the corresponding position on the right side is symmetrical to it; the lower right corner is positioned by the positioning shaft 7, and the corresponding position on the lower left corner is symmetrical to it.

[0059] Reference Figure 3 The outline of the elastic introspective planar part is the same as the shape of the mounting groove 6. The hollow part is the corresponding position of the transition cavity. The optical cable and galvanized steel pipe are rotated and cut off at the central axis positions on the upper and lower sides. The corresponding array grooves / protrusions at the contact positions with the main body shell 1 are used to embed the upper cavity 3 and the lower cavity 4.

[0060] The assembly diagram of the elastic inner liner 5 and the main outer shell 1 is shown in the figure. Figure 4-6 The shape after the entire assembly is completed is as follows Figure 7 As shown, there is a certain gap between the connecting seats 9 on both sides of the main body shell 1 and the contact surface 2. The connecting bolts are omitted in the figure. Those skilled in the art can refer to the corresponding prior art to select appropriate bolts for connection.

[0061] Example 2:

[0062] like Figure 8 As shown, the general structure of Embodiment 2 is the same as that of Embodiment 1. The difference in technical features compared with Embodiment 1 is that the inner wall of the clamping cavity in the elastic liner 5, which corresponds to the upper cavity 3 and the lower cavity 4, is also provided with grooves to form a corrugated structure 10, which is used to provide a certain elastic margin and make the clamping more stable and tight.

[0063] Example 3:

[0064] In Embodiment 3, an improvement was made to the seam of the main body shell 1, referring to... Figure 9 An inset tongue 11 is provided along the edge of the left outer shell, and an outward protrusion 12 is provided at the end of the inset tongue 11.

[0065] Reference Figure 9 An embedding groove 13 is provided at the edge of the outer shell for the inner tongue 11 to be embedded during assembly. Figure 11 This is a schematic diagram showing the connection between the left and right outer shells. This design further enhances the waterproof performance of the device.

Claims

1. A fiber optic cable downlead sealing device, comprising a plurality of splicing modules and a first cavity penetrating the middle of the splicing modules, characterized in that, An elastic liner (5) is provided inside the cavity, and the elastic liner (5) is fitted into the cavity. A second through cavity is opened in the middle of the elastic liner (5). The splicing modules are fixed in relative position by any one of the following methods: snap-fit, riveting, or bolt connection.

2. The optical cable downlead sealing device as described in claim 1, characterized in that, It includes two symmetrical main shells (1). After the two main shells (1) are spliced ​​together, the upper part of the shell is one of hemispherical, conical or parabolic, and the lower part is one of semi-cylindrical or polygonal prism. The middle part of the shell extends along the central axis to form the first cavity. The upper part of the first cavity is smaller than its lower part.

3. The optical cable downlead sealing device as described in claim 2, characterized in that, The device is a split structure with two opposing main shells (1) as the splicing units. The main shells (1) are rotated and cut along their central axis to form the first cavity. The sidewalls of the first cavity are arranged with several grooves along the axial direction.

4. The optical cable downlead sealing device as described in claim 3, characterized in that, When the two main shells (1) are spliced ​​together, the opposite surfaces are contact surfaces (2). The contact surfaces (2) have mounting grooves (6) for installing the elastic inner liner (5). The elastic inner liner (5) is located above and below the first cavity respectively. The elastic inner liner (5) has connecting parts on both sides for connecting the upper and lower elastic inner liners (5).

5. The optical cable lead-down sealing device as described in claim 4, characterized in that, The first cavity includes an upper cavity (3) with a small aperture and a lower cavity (4) with a large aperture. The sidewalls of the upper cavity (3) and the lower cavity (4) are each provided with a plurality of grooves. A transition cavity is provided between the upper cavity (3) and the lower cavity (4).

6. The optical cable lead-out sealing device as described in claim 5, characterized in that, The mounting groove (6) is located near the edge of the first cavity, and the bottom surface of the mounting groove (6) is lower than the contact surface (2), wherein the periphery of the transition cavity is flush with the contact surface (2).

7. The optical cable lead-down sealing device as described in claim 6, characterized in that, The elastic liner (5) is located in the upper cavity (3) and the lower cavity (4) and has the same shape as the corresponding cavity. Furthermore, a number of clamping protrusions are also provided on the inner wall of the second cavity formed in the middle of the elastic liner (5).

8. A fiber optic cable lead-out sealing device as described in any one of claims 4-7, characterized in that, The contact surface (2) is provided with corresponding positioning shafts (7) and positioning holes (8). The positioning shafts (7) and positioning holes (8) are respectively located at the diagonal of the contact surface (2), that is, several positioning shafts (7) are respectively provided on the same diagonal. Then, a central axis is used as the center line, and a corresponding number of positioning holes (8) are symmetrically provided with the positioning shafts (7).

9. The optical cable lead-out sealing device as described in claim 8, characterized in that, The main body shell (1) is provided with connecting seats (9) on both sides. The connecting seats (9) have holes in the middle for connecting bolts. The plane of the connecting seat (9) near the middle is lower than the contact surface (2).

10. The optical cable lead-out sealing device as described in claim 9, characterized in that, The two main body shells (1) have an integral or detachable interlocking buckle at the seam.

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