Protective flame-retardant tube for polyethylene optical cable

Abstract

The utility model discloses a protective flame-retardant tube for a polyethylene optical cable, which relates to the technical field of optical cable protective jackets and comprises a flame-retardant jacket layer, a cable main body is mounted on the inner cylindrical surface of the flame-retardant jacket layer, a wear-resistant layer is fixedly sleeved on the outer cylindrical surface of the flame-retardant jacket layer, and a protective coating is arranged on the outer cylindrical surface of the wear-resistant layer. The flame-retardant effect of the flame-retardant pipe can be improved by arranging the flame-retardant sleeve layer, when a fire disaster occurs, the flame retardance can prevent the fire disaster from directly damaging the cable, the service life of equipment is prolonged, the replacement and maintenance cost is reduced, the flame-retardant sleeve layer can be improved for protection by arranging the wear-resistant layer, and the service life of the equipment is prolonged. The cable provided by the utility model prevents surface damage caused by friction, scraping or external force impact, thereby prolonging the service life of the cable, providing longer-term stable operation, preventing the cable from being crushed or cut by a heavy object, improving the compression resistance and impact resistance of the cable, and reducing the maintenance frequency and cost.

Description

Technical Field

[0001] The utility model relates to the technical field of optical cable protective sleeves, in particular to a protective flame-retardant polyethylene optical cable tube. Background Art

[0002] Optical cables are manufactured to meet optical, mechanical or environmental performance specifications. They are communication cable assemblies that use one or more optical fibers enclosed in a sheath as the transmission medium and can be used individually or in groups. Cables are electrical energy or signal transmission devices, usually consisting of several or several groups of conductors. The outer walls of electrical and optical cables are usually wrapped with protective tubes to protect the internal cables.

[0003] Prior art (Announcement No.: CN 211653227 U) discloses an outer protective tube for communication optical cables, comprising an inner insulating layer, the inner wall of the inner insulating layer being bonded with a radiation protection layer, the outer wall of the inner insulating layer being sheathed with a wear-resistant wrapping layer, a gap being left between the wear-resistant wrapping layer and the inner insulating layer, and a plurality of parallel pressure-resistant rings being arranged in the gap, the pressure-resistant rings being a double-ring structure, the outer edges of which forming an I-shaped component, the outer wall of the I-shaped component being uniformly provided with a plurality of through-holes in a circumferential direction, a plurality of strands of elastic fibers being coaxially arranged in the gap between the wear-resistant wrapping layer and the inner insulating layer, the elastic fibers all passing through the through-holes;

[0004] Although the above patent improves the structural strength of the entire protective tube, and compared with the existing hard protective tube, the entire tube is flexible, which is convenient for laying cables at bends and does not affect the protective function of the entire protective tube, it has the following disadvantages: it lacks flame retardant performance when used, and cannot protect the internal cables in the event of fire. Further improvement is needed. For this reason, we propose a protective flame retardant tube for polyethylene optical cables. Utility Model Content

[0005] The main purpose of the utility model is to provide a protective flame-retardant tube for polyethylene optical cables, which can effectively solve the problems in the background technology.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A protective flame-retardant tube for polyethylene optical cable comprises a flame-retardant sheath, the inner cylindrical surface of which is mounted a cable body, the outer cylindrical surface of which is fixedly sleeved with a wear-resistant layer, and the outer cylindrical surface of which is provided with a protective coating.

[0008] Preferably, the flame retardant sleeve layer comprises a silicone rubber layer, an adhesive layer is provided on the inner cylindrical surface of the silicone rubber layer, and a polyvinylidene fluoride film layer is fixedly sleeved on the outer cylindrical surface of the silicone rubber layer.

[0009] Preferably, the cable body is arranged on the inner cylindrical surface of the adhesive layer.

[0010] Preferably, the wear-resistant layer includes a second flame-retardant rubber sleeve, which is fixedly sleeved on the polyvinylidene fluoride film layer. The outer cylindrical surface of the second flame-retardant rubber sleeve is fixedly sleeved with a metal mesh layer, and the outer surface of the metal mesh layer is fixedly sleeved with the first flame-retardant rubber sleeve.

[0011] Preferably, the protective coating includes a primer coating, which is coated on the outer cylindrical surface of the first flame retardant rubber sleeve, the outer surface of the primer coating is sprayed with a polytetrafluoroethylene coating, the outer surface of the polytetrafluoroethylene coating is provided with a fluorocarbon coating, and the outer surface of the fluorocarbon coating is provided with a bittering agent coating.

[0012] Preferably, the bittering agent coating has a thickness of 10-15 μm, the polytetrafluoroethylene coating has a thickness of 20-50 μm, and the fluorocarbon coating has a thickness of 20-40 μm.

[0013] Preferably, the thickness of the silicone rubber layer is 30-50 mm, and the thickness of the polyvinylidene fluoride film layer is 1-3 mm.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The flame retardant jacket can improve the flame retardant effect of the flame retardant tube. When used, the silicone rubber layer has certain high temperature resistance and flame retardant properties, and the polyvinylidene fluoride film layer has certain heat stability and flame retardancy. It has good creep resistance during the temperature increase process. In the event of a fire, the flame retardancy can prevent the fire from directly damaging the cable, thereby extending the service life of the equipment and reducing replacement and maintenance costs;

[0016] 2. The flame retardant sheath can be enhanced by providing a wear-resistant layer. The first flame retardant rubber sheath can increase the wear resistance of the flame retardant sheath surface, preventing surface damage caused by friction, scratches or external impact, thereby extending the service life of the cable and providing longer-term stable operation. The metal mesh layer can provide additional mechanical protection to prevent the cable from being crushed or cut by heavy objects, thereby improving the cable's compression and impact resistance, reducing maintenance frequency and cost, and preventing the flame retardant sheath from being damaged by external forces, thereby ensuring stable protection of the flame retardant sheath.

[0017] 3. The outer surface of the flame retardant tube can be protected by providing a protective coating. When in use, the bittering agent coating can produce a strong bitter taste when animals bite the protective cover, thereby playing a repellent effect and preventing continuous gnawing from causing damage to the flame retardant tube. The polytetrafluoroethylene coating and fluorocarbon coating have good acid and alkali corrosion resistance, which can prevent the protective cover from being corroded by external acidic and alkaline liquids, further improving the service life of the protective cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the entire structure proposed in this embodiment;

[0019] Figure 2 Schematic diagram of the cross-sectional structure of the wear-resistant layer in this embodiment;

[0020] Figure 3 Schematic diagram of the cross-sectional structure of the flame retardant sleeve in this embodiment;

[0021] Figure 4 Schematic diagram of the cross-sectional structure of the protective coating in this embodiment.

[0022] In the figure: 1. Cable body; 2. Flame-retardant sheath; 3. Wear-resistant layer; 4. Protective coating; 31. First flame-retardant rubber sheath; 32. Metal mesh layer; 33. Second flame-retardant rubber sheath; 21. Adhesive layer; 22. Silicone rubber layer; 23. Polyvinylidene fluoride film layer; 41. Primer coating; 42. Polytetrafluoroethylene coating; 43. Fluorocarbon coating; 44. Bittering agent coating. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0024] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," "the other end," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc. should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0026] like Figures 1-4As shown, a protective flame-retardant tube for polyethylene optical cable includes a flame-retardant sheath 2, the inner cylindrical surface of the flame-retardant sheath 2 is installed with a cable body 1, the outer cylindrical surface of the flame-retardant sheath 2 is fixedly sleeved with a wear-resistant layer 3, and the outer cylindrical surface of the wear-resistant layer 3 is provided with a protective coating 4. The flame-retardant sheath 2 and the wear-resistant layer 3 together constitute a protective flame-retardant tube.

[0027] The flame-retardant sheath 2 is used to improve the flame-retardant effect of the flame-retardant tube. In the event of a fire, the flame retardancy can prevent the fire from directly damaging the cable, extend the service life of the equipment, and reduce replacement and maintenance costs. The specific structure is as follows: the flame-retardant sheath 2 includes a silicone rubber layer 22, the inner cylindrical surface of the silicone rubber layer 22 is provided with an adhesive layer 21, and the outer cylindrical surface of the silicone rubber layer 22 is fixedly sleeved with a polyvinylidene fluoride film layer 23. The thickness of the silicone rubber layer 22 is 30-50 mm, and the thickness of the polyvinylidene fluoride film layer 23 is 1-3 mm.

[0028] The cable body 1 is arranged on the inner cylindrical surface of the adhesive layer 21 , and the adhesive layer 21 is used to adhere the silicone rubber layer 22 to the outer surface of the cable body 1 .

[0029] Furthermore, in order to prevent the flame retardant sheath 2 from being damaged by external forces and ensure the stable protection of the flame retardant sheath 2, the wear-resistant layer 3 can improve the protection of the flame retardant sheath 2. The specific structure is: the wear-resistant layer 3 includes a second flame retardant rubber sheath 33, the second flame retardant rubber sheath 33 is fixedly sleeved on the polyvinylidene fluoride film layer 23, the outer cylindrical surface of the second flame retardant rubber sheath 33 is fixedly sleeved with a metal mesh layer 32, and the outer surface of the metal mesh layer 32 is fixedly sleeved with a first flame retardant rubber sheath 31. The first flame retardant rubber sheath 31 can increase the wear resistance of the surface of the flame retardant sheath 2 and prevent surface damage caused by friction, scratches or external force impact, thereby extending the service life of the cable and providing longer-term stable operation. The metal mesh layer 32 can provide additional mechanical protection to prevent the cable from being crushed or cut by heavy objects, improve the cable's pressure and impact resistance, and reduce maintenance frequency and cost.

[0030] Furthermore, the protective coating 4 is used to protect the outer surface of the flame retardant tube. The protective coating 4 includes a primer coating 41. The primer coating 41 is coated on the outer cylindrical surface of the first flame retardant rubber sleeve 31. The outer surface of the primer coating 41 is sprayed with a polytetrafluoroethylene coating 42. The primer coating 41 is used to improve the adhesion of the polytetrafluoroethylene coating 42. The outer surface of the polytetrafluoroethylene coating 42 is provided with a fluorocarbon coating 43. The outer surface of the fluorocarbon coating 43 is provided with a bittering agent coating 44. The bittering agent coating 44 has a thickness of 10-15 μm, the thickness of the polytetrafluoroethylene coating 42 is 20-50 μm, and the thickness of the fluorocarbon coating 43 is 10-15 μm. The density is 20-40μm. The bittering agent coating 44 is made of a strongly bitter chemical substance, which can produce a strong bitter taste when animals gnaw on the protective cover, thereby playing a repellent effect and preventing continuous gnawing from damaging the flame retardant tube. The polytetrafluoroethylene coating 42 and the fluorocarbon coating 43 have good acid and alkali corrosion resistance, which can prevent external acid and alkaline liquids from corroding the protective cover, further improving the service life of the protective cover. At the same time, the fluorocarbon coating 43 has strong UV resistance and can effectively resist ultraviolet rays in sunlight, preventing the flame retardant tube from aging, embrittlement, discoloration and performance degradation caused by ultraviolet radiation.

[0031] The utility model proposes a flame-retardant protective tube for polyethylene optical cables. When in use, the silicone rubber layer 22 has certain high temperature resistance and flame retardant properties, the polyvinylidene fluoride film layer 23 has certain heat stability and flame retardancy, and has good creep resistance during temperature increase. In the event of a fire, the flame retardancy can prevent the fire from directly damaging the cable. The first flame-retardant rubber sleeve 31 can increase the wear resistance of the surface of the flame-retardant sleeve 2 to prevent surface damage caused by friction, scratches or external force impact. The metal mesh layer 32 can provide additional mechanical protection to prevent the cable from being crushed or cut by heavy objects. The bittering agent coating 44 can produce a strong bitter taste when animals gnaw on the protective sleeve, thereby playing a repellent effect. The polytetrafluoroethylene coating 42 and the fluorocarbon coating 43 have good acid and alkali corrosion resistance and can prevent external acid and alkaline liquids from corroding the protective sleeve.

[0032] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A flame-retardant protective tube for polyethylene optical cable, comprising a flame-retardant sheath (2), characterized in that: The cable body (1) is mounted on the inner cylindrical surface of the flame-retardant sheath (2), a wear-resistant layer (3) is fixedly sleeved on the outer cylindrical surface of the flame-retardant sheath (2), and a protective coating (4) is provided on the outer cylindrical surface of the wear-resistant layer (3).

2. The flame-retardant protective tube for polyethylene optical cable according to claim 1, characterized in that: The flame retardant sleeve layer (2) comprises a silicone rubber layer (22), an inner cylindrical surface of the silicone rubber layer (22) is provided with an adhesive layer (21), and an outer cylindrical surface of the silicone rubber layer (22) is fixedly sleeved with a polyvinylidene fluoride film layer (23).

3. The flame-retardant protective tube for polyethylene optical cable according to claim 2, characterized in that: The cable body (1) is arranged on the inner cylindrical surface of the adhesive layer (21).

4. The flame-retardant protective tube for polyethylene optical cable according to claim 2, characterized in that: The wear-resistant layer (3) comprises a second flame-retardant rubber sleeve (33), the second flame-retardant rubber sleeve (33) is fixedly sleeved on the polyvinylidene fluoride film layer (23), the outer cylindrical surface of the second flame-retardant rubber sleeve (33) is fixedly sleeved with a metal mesh layer (32), and the outer surface of the metal mesh layer (32) is fixedly sleeved with the first flame-retardant rubber sleeve (31).

5. The flame-retardant protective tube for polyethylene optical cable according to claim 4, characterized in that: The protective coating (4) comprises a primer coating (41), the primer coating (41) being coated on the outer cylindrical surface of the first flame retardant rubber sleeve (31), the outer surface of the primer coating (41) being sprayed with a polytetrafluoroethylene coating (42), the outer surface of the polytetrafluoroethylene coating (42) being provided with a fluorocarbon coating (43), and the outer surface of the fluorocarbon coating (43) being provided with a bittering agent coating (44).

6. The flame-retardant protective tube for polyethylene optical cable according to claim 5, characterized in that: The bittering agent coating (44) has a thickness of 10-15 μm, the polytetrafluoroethylene coating (42) has a thickness of 20-50 μm, and the fluorocarbon coating (43) has a thickness of 20-40 μm.

7. The flame-retardant protective tube for polyethylene optical cable according to claim 2, characterized in that: The thickness of the silicone rubber layer (22) is 30-50 mm, and the thickness of the polyvinylidene fluoride film layer (23) is 1-3 mm.

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