A flame-retardant optical cable with nested structure and a flame-retardant photoelectric composite cable

Abstract

The present invention belongs to the technical field of cables, and discloses a flame-retardant optical cable with a nested structure and a flame-retardant optoelectronic composite cable. A flame-retardant optical cable with a nested structure has an outer sheath and a cable core, wherein the cable core is located inside the outer sheath, and the cable core is composed of at least two loose tubes, wherein the loose tubes are composed of a C-shaped outer wall, a C-shaped inner wall, and two tube side walls, and two adjacent loose tubes are nested with each other, and an optical fiber ribbon is located between the outer wall and the inner wall of the loose tube; the present invention has the beneficial effects of expandable number of optical fiber ribbons in the cable core, convenient cabling and construction, tight loose tube combination, fast heat dissipation, and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of cables, and in particular relates to a flame-retardant optical cable with a nested structure and a flame-retardant optoelectronic composite cable. Background Art

[0002] In the prior art, CN117148528A discloses a self-supporting optical cable, which has an outer sheath and a cable core, wherein the outer sheath is located outside the cable core, and the cable core is composed of three optical unit protective layer components, and the optical unit protective layer components are composed of a protective plate, a first side plate, a second side plate, and a third side plate. In the same cross section, one end of the protective plate is connected to one end of the second side plate, and the angle between the protective plate and the second side plate is 120 degrees. The other end of the second side plate is connected to one end of the third side plate, and the angle between the second side plate and the third side plate is 120 degrees. One end of the first side plate is connected to the protective plate, and the first side plate and the third side plate are parallel. The protective plate, the third side plate, and the first side plate are located on the same side of the second side plate, and a second receiving groove is formed between the first side plate and the third side plate, and a first receiving groove is formed between the protective plate and the first side plate. The side wall of the second side plate between the protective plate and the first side plate is the first inner wall, the width of the first inner wall is the same as the end face width of the other end of the third side plate, and at least one optical communication component is arranged in the second accommodating groove; along the clockwise direction, the first side plate and the third side plate of the previous optical unit protective layer component are inserted into the first accommodating groove of the next optical unit protective layer component, the other end of the third side plate of the previous optical unit protective layer component is fitted with the first inner wall of the next optical unit protective layer component, and the third side plate of the previous optical unit protective layer component is fitted with the protective plate of the next optical unit protective layer component; an armor layer is arranged between the outer sheath and the cable core, the armor layer is composed of three armor reinforcement components, an external reinforcement member is arranged in the armor reinforcement component, and along the clockwise direction, the previous armor reinforcement component is plugged into the next armor reinforcement component.

[0003] The above-mentioned prior arts all have the following drawbacks: 1. It is impossible to expand the optical communication components in the cable core as needed; 2. When separating the cable core, the three optical units can only be separated together, which is inconvenient for construction and cabling. Summary of the invention

[0004] In order to solve the above problems, the purpose of the present invention is to disclose a flame-retardant optical cable and a flame-retardant optoelectronic composite cable with a nested structure, which are achieved by adopting the following technical solutions.

[0005] A nested flame-retardant optical cable comprises an outer sheath and a cable core, wherein the cable core is located inside the outer sheath, and the cable core is composed of at least two loose tubes, wherein the loose tubes are composed of a C-shaped outer wall, a C-shaped inner wall and two tube side walls;

[0006] The outer wall body is composed of a first sleeve outer wall, a second sleeve outer wall, a third sleeve outer wall, a fourth sleeve outer wall and a fifth sleeve outer wall of equal length. In the same cross section, one end of the first sleeve outer wall is connected to one end of the second sleeve outer wall, the other end of the second sleeve outer wall is connected to one end of the third sleeve outer wall, the other end of the third sleeve outer wall is connected to one end of the fourth sleeve outer wall, the other end of the fourth sleeve outer wall is connected to one end of the fifth sleeve outer wall, and the first sleeve outer wall is 120° to the second sleeve outer wall, the second sleeve outer wall is 120° to the third sleeve outer wall, the third sleeve outer wall is 120° to the fourth sleeve outer wall, and the fourth sleeve outer wall is 120° to the fifth sleeve outer wall;

[0007] The inner wall body is located in the C-shaped groove of the outer wall body, and the inner wall body is composed of a first sleeve inner wall, a second sleeve inner wall, a third sleeve inner wall, a fourth sleeve inner wall, and a fifth sleeve inner wall of equal length, one end of the first sleeve inner wall is connected to one end of the second sleeve inner wall, the other end of the second sleeve inner wall is connected to one end of the third sleeve inner wall, the other end of the third sleeve inner wall is connected to one end of the fourth sleeve inner wall, and the other end of the fourth sleeve inner wall is connected to one end of the fifth sleeve inner wall, and the first sleeve inner wall and the second sleeve inner wall are 120°, the second sleeve inner wall and the third sleeve inner wall are 120°, the third sleeve inner wall and the fourth sleeve inner wall are 120°, and the fourth sleeve inner wall and the fifth sleeve inner wall are 120°;

[0008] The other end of the first sleeve outer wall is connected to one end of a sleeve side wall, the other end of the first sleeve inner wall is connected to the other end of a sleeve side wall, the other end of the fifth sleeve outer wall is connected to one end of another sleeve side wall, and the other end of the fifth sleeve inner wall is connected to the other end of another sleeve side wall;

[0009] The outer wall of the first sleeve is parallel to the inner wall of the first sleeve, the outer wall of the second sleeve is parallel to the inner wall of the second sleeve, the outer wall of the third sleeve is parallel to the inner wall of the third sleeve, the outer wall of the fourth sleeve is parallel to the inner wall of the fourth sleeve, and the outer wall of the fifth sleeve is parallel to the inner wall of the fifth sleeve;

[0010] A first cavity is formed between the outer wall of the first sleeve and the inner wall of the first sleeve, a second cavity is formed between the outer wall of the second sleeve and the inner wall of the second sleeve, a third cavity is formed between the outer wall of the third sleeve and the inner wall of the third sleeve, a fourth cavity is formed between the outer wall of the fourth sleeve and the inner wall of the fourth sleeve, and a fifth cavity is formed between the outer wall of the fifth sleeve and the inner wall of the fifth sleeve, and optical fiber ribbons are arranged in the first cavity, the second cavity, the third cavity, the fourth cavity and the fifth cavity;

[0011] The C-shaped groove of the inner wall body is a receiving groove, and an inlet and outlet are formed between the two sleeve side walls, and the angle between the two sleeve side walls is 60°;

[0012] Two adjacent loose tubes are nested with each other, and the inner loose tube is located in the receiving groove of the outer loose tube.

[0013] In the above-mentioned nested flame-retardant optical cable, the outer wall of the first sleeve of the inner loose tube and the inner wall of the first sleeve of the outer loose tube are equal in length and fit each other, and the inlets and outlets of the two adjacent loose tubes are oriented in the same direction;

[0014] Alternatively, the outer wall of the first casing of the inner loose tube and the inner wall of the second casing of the outer loose tube are equal in length and fit each other, and the inlet and outlet directions of two adjacent loose tubes form an angle of 60°;

[0015] Alternatively, the outer wall of the first casing of the inner loose tube and the inner wall of the third casing of the outer loose tube are equal in length and fit each other, and the inlet and outlet directions of two adjacent loose tubes form an angle of 120°;

[0016] Alternatively, the outer wall of the first casing of the inner loose tube and the inner wall of the fourth casing of the outer loose tube are equal in length and fit each other, and the inlets and outlets of the two adjacent loose tubes face in opposite directions;

[0017] Alternatively, the outer wall of the first casing of the inner loose tube and the inner wall of the fifth casing of the outer loose tube are equal in length and fit each other, and the angle between the inlet and outlet directions of two adjacent loose tubes is 240°;

[0018] Alternatively, the second sleeve outer wall of the inner loose sleeve and the first sleeve inner wall of the outer loose sleeve are of equal length and fit each other, and the inlet and outlet directions of two adjacent loose sleeves form an angle of 300°.

[0019] In the above-mentioned nested flame-retardant optical cable, a regular hexagonal reinforcement member is provided in the receiving groove of the innermost loose tube, and the inner wall body is in contact with five sides of the reinforcement member.

[0020] A nested flame-retardant optical cable, comprising an outer sheath and a cable core, wherein the cable core is located inside the outer sheath, and the cable core is composed of at least two loose tube assemblies and a reinforcement member;

[0021] The loose tube assembly is composed of at least two loose tubes, and the loose tubes are composed of a C-shaped outer wall body, a C-shaped inner wall body and two tube side walls;

[0022] The outer wall body is composed of a first sleeve outer wall, a second sleeve outer wall, a third sleeve outer wall, a fourth sleeve outer wall and a fifth sleeve outer wall of equal length. In the same cross section, one end of the first sleeve outer wall is connected to one end of the second sleeve outer wall, the other end of the second sleeve outer wall is connected to one end of the third sleeve outer wall, the other end of the third sleeve outer wall is connected to one end of the fourth sleeve outer wall, the other end of the fourth sleeve outer wall is connected to one end of the fifth sleeve outer wall, and the first sleeve outer wall is 120° to the second sleeve outer wall, the second sleeve outer wall is 120° to the third sleeve outer wall, the third sleeve outer wall is 120° to the fourth sleeve outer wall, and the fourth sleeve outer wall is 120° to the fifth sleeve outer wall;

[0023] The inner wall body is located in the C-shaped groove of the outer wall body, and the inner wall body is composed of a first sleeve inner wall, a second sleeve inner wall, a third sleeve inner wall, a fourth sleeve inner wall, and a fifth sleeve inner wall of equal length, one end of the first sleeve inner wall is connected to one end of the second sleeve inner wall, the other end of the second sleeve inner wall is connected to one end of the third sleeve inner wall, the other end of the third sleeve inner wall is connected to one end of the fourth sleeve inner wall, and the other end of the fourth sleeve inner wall is connected to one end of the fifth sleeve inner wall, and the first sleeve inner wall and the second sleeve inner wall are 120°, the second sleeve inner wall and the third sleeve inner wall are 120°, the third sleeve inner wall and the fourth sleeve inner wall are 120°, and the fourth sleeve inner wall and the fifth sleeve inner wall are 120°;

[0024] The other end of the first sleeve outer wall is connected to one end of a sleeve side wall, the other end of the first sleeve inner wall is connected to the other end of a sleeve side wall, the other end of the fifth sleeve outer wall is connected to one end of another sleeve side wall, and the other end of the fifth sleeve inner wall is connected to the other end of another sleeve side wall;

[0025] The outer wall of the first sleeve is parallel to the inner wall of the first sleeve, the outer wall of the second sleeve is parallel to the inner wall of the second sleeve, the outer wall of the third sleeve is parallel to the inner wall of the third sleeve, the outer wall of the fourth sleeve is parallel to the inner wall of the fourth sleeve, and the outer wall of the fifth sleeve is parallel to the inner wall of the fifth sleeve;

[0026] A first cavity is formed between the outer wall of the first sleeve and the inner wall of the first sleeve, a second cavity is formed between the outer wall of the second sleeve and the inner wall of the second sleeve, a third cavity is formed between the outer wall of the third sleeve and the inner wall of the third sleeve, a fourth cavity is formed between the outer wall of the fourth sleeve and the inner wall of the fourth sleeve, and a fifth cavity is formed between the outer wall of the fifth sleeve and the inner wall of the fifth sleeve, and optical fiber ribbons are arranged in the first cavity, the second cavity, the third cavity, the fourth cavity and the fifth cavity;

[0027] The C-shaped groove of the inner wall body is a receiving groove, and an inlet and outlet are formed between the two sleeve side walls, and the angle between the two sleeve side walls is 60°;

[0028] In each loose tube assembly, two adjacent loose tubes are nested with each other, the inner loose tube is located in the receiving groove of the outer loose tube, the outer wall of the first tube of the inner loose tube and the inner wall of the first tube of the outer loose tube are equal in length and fit each other, and the inlet and outlet directions of the two adjacent loose tubes are the same;

[0029] The reinforcement is composed of a fixing head and a connector, the fixing head being located at the outer edge of the connector, and the fixing head is nested and fixed in the receiving groove of the innermost loose tube of the corresponding loose tube assembly, and the side walls of all the loose tubes are in contact with the side walls of the corresponding connector.

[0030] In the above-mentioned nested flame-retardant optical cable, the first cavity, the second cavity, the third cavity, the fourth cavity and the fifth cavity are connected in sequence; or, the first cavity and the second cavity are separated by a partition wall, the second cavity and the third cavity are separated by a partition wall, the third cavity and the fourth cavity are separated by a partition wall, and the fourth cavity and the fifth cavity are separated by a partition wall.

[0031] A nested flame-retardant optoelectronic composite cable comprises an outer sheath and a cable core, wherein the cable core is located inside the outer sheath, and the cable core is composed of at least two loose tubes, wherein the loose tubes are composed of a C-shaped outer wall, a C-shaped inner wall and two tube side walls;

[0032] The outer wall body is composed of a first sleeve outer wall, a second sleeve outer wall, a third sleeve outer wall, a fourth sleeve outer wall and a fifth sleeve outer wall of equal length. In the same cross section, one end of the first sleeve outer wall is connected to one end of the second sleeve outer wall, the other end of the second sleeve outer wall is connected to one end of the third sleeve outer wall, the other end of the third sleeve outer wall is connected to one end of the fourth sleeve outer wall, the other end of the fourth sleeve outer wall is connected to one end of the fifth sleeve outer wall, and the first sleeve outer wall is 120° to the second sleeve outer wall, the second sleeve outer wall is 120° to the third sleeve outer wall, the third sleeve outer wall is 120° to the fourth sleeve outer wall, and the fourth sleeve outer wall is 120° to the fifth sleeve outer wall;

[0033] The inner wall body is located in the C-shaped groove of the outer wall body, and the inner wall body is composed of a first sleeve inner wall, a second sleeve inner wall, a third sleeve inner wall, a fourth sleeve inner wall, and a fifth sleeve inner wall of equal length, one end of the first sleeve inner wall is connected to one end of the second sleeve inner wall, the other end of the second sleeve inner wall is connected to one end of the third sleeve inner wall, the other end of the third sleeve inner wall is connected to one end of the fourth sleeve inner wall, and the other end of the fourth sleeve inner wall is connected to one end of the fifth sleeve inner wall, and the first sleeve inner wall and the second sleeve inner wall are 120°, the second sleeve inner wall and the third sleeve inner wall are 120°, the third sleeve inner wall and the fourth sleeve inner wall are 120°, and the fourth sleeve inner wall and the fifth sleeve inner wall are 120°;

[0034] The other end of the first sleeve outer wall is connected to one end of a sleeve side wall, the other end of the first sleeve inner wall is connected to the other end of a sleeve side wall, the other end of the fifth sleeve outer wall is connected to one end of another sleeve side wall, and the other end of the fifth sleeve inner wall is connected to the other end of another sleeve side wall;

[0035] The outer wall of the first sleeve is parallel to the inner wall of the first sleeve, the outer wall of the second sleeve is parallel to the inner wall of the second sleeve, the outer wall of the third sleeve is parallel to the inner wall of the third sleeve, the outer wall of the fourth sleeve is parallel to the inner wall of the fourth sleeve, and the outer wall of the fifth sleeve is parallel to the inner wall of the fifth sleeve;

[0036] A first cavity is formed between the outer wall of the first sleeve and the inner wall of the first sleeve, a second cavity is formed between the outer wall of the second sleeve and the inner wall of the second sleeve, a third cavity is formed between the outer wall of the third sleeve and the inner wall of the third sleeve, a fourth cavity is formed between the outer wall of the fourth sleeve and the inner wall of the fourth sleeve, and a fifth cavity is formed between the outer wall of the fifth sleeve and the inner wall of the fifth sleeve, and optical fiber ribbons are arranged in the first cavity, the second cavity, the third cavity, the fourth cavity and the fifth cavity;

[0037] The C-shaped groove of the inner wall body is a receiving groove, and an inlet and outlet are formed between the two sleeve side walls, and the angle between the two sleeve side walls is 60°;

[0038] Two adjacent loose tubes are nested with each other, and the inner loose tube is located in the receiving groove of the outer loose tube.

[0039] In the above-mentioned nested flame-retardant optoelectronic composite cable, the outer wall of the first sleeve of the inner loose tube and the inner wall of the first sleeve of the outer loose tube are equal in length and fit each other, and the inlets and outlets of the two adjacent loose tubes are oriented in the same direction;

[0040] Alternatively, the outer wall of the first casing of the inner loose tube and the inner wall of the second casing of the outer loose tube are equal in length and fit each other, and the inlet and outlet directions of two adjacent loose tubes form an angle of 60°;

[0041] Alternatively, the outer wall of the first casing of the inner loose tube and the inner wall of the third casing of the outer loose tube are equal in length and fit each other, and the inlet and outlet directions of two adjacent loose tubes form an angle of 120°;

[0042] Alternatively, the outer wall of the first casing of the inner loose tube and the inner wall of the fourth casing of the outer loose tube are equal in length and fit each other, and the inlets and outlets of the two adjacent loose tubes face in opposite directions;

[0043] Alternatively, the outer wall of the first casing of the inner loose tube and the inner wall of the fifth casing of the outer loose tube are equal in length and fit each other, and the angle between the inlet and outlet directions of two adjacent loose tubes is 240°;

[0044] Alternatively, the second sleeve outer wall of the inner loose sleeve and the first sleeve inner wall of the outer loose sleeve are of equal length and fit each other, and the inlet and outlet directions of two adjacent loose sleeves form an angle of 300°.

[0045] In the above-mentioned nested flame-retardant optoelectronic composite cable, a regular hexagonal reinforcement member is provided in the receiving groove of the innermost loose tube, and the inner wall body is in contact with five sides of the reinforcement member.

[0046] A nested flame-retardant optoelectronic composite cable, comprising an outer sheath and a cable core, wherein the cable core is located inside the outer sheath, and the cable core is composed of at least two loose tube assemblies and a reinforcement member;

[0047] The loose tube assembly is composed of at least two loose tubes, and the loose tubes are composed of a C-shaped outer wall body, a C-shaped inner wall body and two tube side walls;

[0048] The outer wall body is composed of a first sleeve outer wall, a second sleeve outer wall, a third sleeve outer wall, a fourth sleeve outer wall and a fifth sleeve outer wall of equal length. In the same cross section, one end of the first sleeve outer wall is connected to one end of the second sleeve outer wall, the other end of the second sleeve outer wall is connected to one end of the third sleeve outer wall, the other end of the third sleeve outer wall is connected to one end of the fourth sleeve outer wall, the other end of the fourth sleeve outer wall is connected to one end of the fifth sleeve outer wall, and the first sleeve outer wall is 120° to the second sleeve outer wall, the second sleeve outer wall is 120° to the third sleeve outer wall, the third sleeve outer wall is 120° to the fourth sleeve outer wall, and the fourth sleeve outer wall is 120° to the fifth sleeve outer wall;

[0049] The inner wall body is located in the C-shaped groove of the outer wall body, and the inner wall body is composed of a first sleeve inner wall, a second sleeve inner wall, a third sleeve inner wall, a fourth sleeve inner wall, and a fifth sleeve inner wall of equal length, one end of the first sleeve inner wall is connected to one end of the second sleeve inner wall, the other end of the second sleeve inner wall is connected to one end of the third sleeve inner wall, the other end of the third sleeve inner wall is connected to one end of the fourth sleeve inner wall, and the other end of the fourth sleeve inner wall is connected to one end of the fifth sleeve inner wall, and the first sleeve inner wall and the second sleeve inner wall are 120°, the second sleeve inner wall and the third sleeve inner wall are 120°, the third sleeve inner wall and the fourth sleeve inner wall are 120°, and the fourth sleeve inner wall and the fifth sleeve inner wall are 120°;

[0050] The other end of the first sleeve outer wall is connected to one end of a sleeve side wall, the other end of the first sleeve inner wall is connected to the other end of a sleeve side wall, the other end of the fifth sleeve outer wall is connected to one end of another sleeve side wall, and the other end of the fifth sleeve inner wall is connected to the other end of another sleeve side wall;

[0051] The outer wall of the first sleeve is parallel to the inner wall of the first sleeve, the outer wall of the second sleeve is parallel to the inner wall of the second sleeve, the outer wall of the third sleeve is parallel to the inner wall of the third sleeve, the outer wall of the fourth sleeve is parallel to the inner wall of the fourth sleeve, and the outer wall of the fifth sleeve is parallel to the inner wall of the fifth sleeve;

[0052] A first cavity is formed between the outer wall of the first sleeve and the inner wall of the first sleeve, a second cavity is formed between the outer wall of the second sleeve and the inner wall of the second sleeve, a third cavity is formed between the outer wall of the third sleeve and the inner wall of the third sleeve, a fourth cavity is formed between the outer wall of the fourth sleeve and the inner wall of the fourth sleeve, and a fifth cavity is formed between the outer wall of the fifth sleeve and the inner wall of the fifth sleeve, and optical fiber ribbons are arranged in the first cavity, the second cavity, the third cavity, the fourth cavity and the fifth cavity;

[0053] The C-shaped groove of the inner wall body is a receiving groove, and an inlet and outlet are formed between the two sleeve side walls, and the angle between the two sleeve side walls is 60°;

[0054] In each loose tube assembly, two adjacent loose tubes are nested with each other, the inner loose tube is located in the receiving groove of the outer loose tube, the outer wall of the first tube of the inner loose tube and the inner wall of the first tube of the outer loose tube are equal in length and fit each other, and the inlet and outlet directions of the two adjacent loose tubes are the same;

[0055] The reinforcement is composed of a fixing head and a connector, the fixing head being located at the outer edge of the connector, and the fixing head is nested and fixed in the receiving groove of the innermost loose tube of the corresponding loose tube assembly, and the side walls of all the loose tubes are in contact with the side walls of the corresponding connector.

[0056] In the above-mentioned nested flame-retardant optoelectronic composite cable, the first cavity, the second cavity, the third cavity, the fourth cavity and the fifth cavity are connected in sequence; or, the first cavity and the second cavity are separated by a partition wall, the second cavity and the third cavity are separated by a partition wall, the third cavity and the fourth cavity are separated by a partition wall, and the fourth cavity and the fifth cavity are separated by a partition wall.

[0057] This application has the following beneficial effects:

[0058] 1. Adjacent loose tubes can be nested with each other, and the number of optical fiber cores in the cable core can be expanded layer by layer as needed.

[0059] 2. Adjacent loose tubes are fixed by nesting, without the need for other fixing components, making the cabling easy. During laying, each loose tube can be separated individually by simply peeling off the nested loose tubes one by one, making the construction easy.

[0060] 3. The loose tube is an open regular hexagon. The inner loose tube and the outer loose tube fit together, making the nesting of the two adjacent loose tubes tighter and the cable core smaller.

[0061] 4. Due to the existence of the inlet and outlet of the inner loose tube between two adjacent loose tubes, the heat inside the cable can be dissipated faster.

[0062] 5. When the inlet and outlet directions of the loose tubes in the loose tube assembly are consistent, multiple loose tube assemblies can be fixed on the same reinforcement member to increase the number of optical fiber ribbons or electrical units in the optical cable or electrical cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 This is a schematic diagram of the three-dimensional structure of a section of Example 1.

[0064] Figure 2 This is a schematic structural diagram of the end face of Example 1.

[0065] Figure 3 This is a schematic structural diagram of the end faces of two loose tubes nested in each other in Example 1.

[0066] Figure 4 This is a schematic structural diagram of the end surface of the loose tube of Example 1.

[0067] Figure 5 This is a schematic diagram of the three-dimensional structure of a section of Example 2.

[0068] Figure 6 This is a schematic structural diagram of the end face of Example 2.

[0069] Figure 7 This is a schematic structural diagram of the end faces of two loose tubes nested in each other in Example 2.

[0070] Figure 8 This is a schematic diagram of the three-dimensional structure of a section of Example 3.

[0071] Fig. 9 This is a schematic structural diagram of the end face of Example 3.

[0072] Fig.10 This is a schematic structural diagram of the end surface of the reinforcement member of Example 3.

[0073] Fig.11 Schematic diagram of the structure of the loose tube and the end surface of the optical fiber ribbon in the loose tube of Example 4.

[0074] Fig.12 This is a schematic structural diagram of the end face of the loose tube of Example 4.

[0075] In the figure: 1. outer sheath, 2. loose tube, 3. reinforcement, 31. fixing head, 32. connector, 4. optical fiber ribbon, 5. filling component, 23. inlet and outlet, 24. receiving groove, 25. partition wall, 211. first tube outer wall, 212. second tube outer wall, 213. third tube outer wall, 214. fourth tube outer wall, 215. fifth tube outer wall, 216. tube side wall, 221. first cavity, 222. second cavity, 223. third cavity, 224. fourth cavity, 225. fifth cavity, 231. first tube inner wall, 232. second tube inner wall, 233. third tube inner wall, 234. fourth tube inner wall, 235. fifth tube inner wall. DETAILED DESCRIPTION

[0076] Example 1: Figures 1 to 4 A nested flame-retardant optical cable, comprising an outer sheath 1 and a cable core, wherein the cable core is located within the outer sheath 1, and the cable core is composed of three loose tubes 2, wherein the loose tubes 2 are composed of a C-shaped outer wall, a C-shaped inner wall and two tube side walls 216;

[0077] The outer wall body is composed of a first sleeve outer wall 211, a second sleeve outer wall 212, a third sleeve outer wall 213, a fourth sleeve outer wall 214 and a fifth sleeve outer wall 215 of equal length. In the same cross section, one end of the first sleeve outer wall 211 is connected to one end of the second sleeve outer wall 212, the other end of the second sleeve outer wall 212 is connected to one end of the third sleeve outer wall 213, the other end of the third sleeve outer wall 213 is connected to one end of the fourth sleeve outer wall 214, and the other end of the fourth sleeve outer wall 214 is connected to one end of the fifth sleeve outer wall 215. The first sleeve outer wall 211 is 120° to the second sleeve outer wall 212, the second sleeve outer wall 212 is 120° to the third sleeve outer wall 213, the third sleeve outer wall 213 is 120° to the fourth sleeve outer wall 214, and the fourth sleeve outer wall 214 is 120° to the fifth sleeve outer wall 215.

[0078] The inner wall body is located in the C-shaped groove of the outer wall body, and the inner wall body is composed of a first sleeve inner wall 231, a second sleeve inner wall 232, a third sleeve inner wall 233, a fourth sleeve inner wall 234 and a fifth sleeve inner wall 235 of equal length. One end of the first sleeve inner wall 231 is connected to one end of the second sleeve inner wall 232, the other end of the second sleeve inner wall 232 is connected to one end of the third sleeve inner wall 233, and the other end of the third sleeve inner wall 233 is connected to one end of the third sleeve inner wall 234. connected to one end of the fourth sleeve inner wall 234, the other end of the fourth sleeve inner wall 234 is connected to one end of the fifth sleeve inner wall 235, and the first sleeve inner wall 231 and the second sleeve inner wall 232 are 120 degrees, the second sleeve inner wall 232 and the third sleeve inner wall 233 are 120 degrees, the third sleeve inner wall 233 and the fourth sleeve inner wall 234 are 120 degrees, and the fourth sleeve inner wall 234 and the fifth sleeve inner wall 235 are 120 degrees;

[0079] The other end of the first sleeve outer wall 211 is connected to one end of a sleeve side wall 216, the other end of the first sleeve inner wall 231 is connected to the other end of a sleeve side wall 216, the other end of the fifth sleeve outer wall 215 is connected to one end of another sleeve side wall 216, and the other end of the fifth sleeve inner wall 235 is connected to the other end of another sleeve side wall 216;

[0080] The first sleeve outer wall 211 is parallel to the first sleeve inner wall 231, the second sleeve outer wall 212 is parallel to the second sleeve inner wall 232, the third sleeve outer wall 213 is parallel to the third sleeve inner wall 233, the fourth sleeve outer wall 214 is parallel to the fourth sleeve inner wall 234, and the fifth sleeve outer wall 215 is parallel to the fifth sleeve inner wall 235;

[0081] A first cavity 221 is formed between the first sleeve outer wall 211 and the first sleeve inner wall 231, a second cavity 222 is formed between the second sleeve outer wall 212 and the second sleeve inner wall 232, a third cavity 223 is formed between the third sleeve outer wall 213 and the third sleeve inner wall 233, a fourth cavity 224 is formed between the fourth sleeve outer wall 214 and the fourth sleeve inner wall 234, and a fifth cavity 225 is formed between the fifth sleeve outer wall 215 and the fifth sleeve inner wall 235. The first cavity 221, the second cavity 222, the third cavity 223, the fourth cavity 224 and the fifth cavity 225 are connected in sequence, and the first cavity 221, the second cavity 222, the third cavity 223, the fourth cavity 224 and the fifth cavity 225 are provided with an optical fiber ribbon 4;

[0082] The C-shaped groove of the inner wall is a receiving groove 24, and an inlet and outlet 23 is formed between the two sleeve side walls 216, and the angle between the two sleeve side walls 216 is 60°;

[0083] Two adjacent loose tubes 2 are nested with each other, the inner loose tube 2 is located in the receiving groove 24 of the outer loose tube 2, the first tube outer wall 211 of the inner loose tube 2 and the fourth tube inner wall 234 of the outer loose tube 2 are equal in length and fit each other, the inlet and outlet 23 of the two adjacent loose tubes 2 are in opposite directions, a regular hexagonal reinforcement member 3 is provided in the receiving groove 24 of the innermost loose tube 2, and the inner wall body fits with five sides of the reinforcement member 3.

[0084] Example 2: Figures 5 to 7 , and refer to Figure 4 A nested flame-retardant optical cable, comprising an outer sheath 1 and a cable core, wherein the cable core is located within the outer sheath 1, and the cable core is composed of three loose tubes 2, wherein the loose tubes 2 are composed of a C-shaped outer wall, a C-shaped inner wall and two tube side walls 216;

[0085] The outer wall body is composed of a first sleeve outer wall 211, a second sleeve outer wall 212, a third sleeve outer wall 213, a fourth sleeve outer wall 214 and a fifth sleeve outer wall 215 of equal length. In the same cross section, one end of the first sleeve outer wall 211 is connected to one end of the second sleeve outer wall 212, the other end of the second sleeve outer wall 212 is connected to one end of the third sleeve outer wall 213, the other end of the third sleeve outer wall 213 is connected to one end of the fourth sleeve outer wall 214, and the other end of the fourth sleeve outer wall 214 is connected to one end of the fifth sleeve outer wall 215. The first sleeve outer wall 211 is 120° to the second sleeve outer wall 212, the second sleeve outer wall 212 is 120° to the third sleeve outer wall 213, the third sleeve outer wall 213 is 120° to the fourth sleeve outer wall 214, and the fourth sleeve outer wall 214 is 120° to the fifth sleeve outer wall 215.

[0086] The inner wall body is located in the C-shaped groove of the outer wall body, and the inner wall body is composed of a first sleeve inner wall 231, a second sleeve inner wall 232, a third sleeve inner wall 233, a fourth sleeve inner wall 234 and a fifth sleeve inner wall 235 of equal length. One end of the first sleeve inner wall 231 is connected to one end of the second sleeve inner wall 232, the other end of the second sleeve inner wall 232 is connected to one end of the third sleeve inner wall 233, and the other end of the third sleeve inner wall 233 is connected to one end of the third sleeve inner wall 234. connected to one end of the fourth sleeve inner wall 234, the other end of the fourth sleeve inner wall 234 is connected to one end of the fifth sleeve inner wall 235, and the first sleeve inner wall 231 and the second sleeve inner wall 232 are 120 degrees, the second sleeve inner wall 232 and the third sleeve inner wall 233 are 120 degrees, the third sleeve inner wall 233 and the fourth sleeve inner wall 234 are 120 degrees, and the fourth sleeve inner wall 234 and the fifth sleeve inner wall 235 are 120 degrees;

[0087] The other end of the first sleeve outer wall 211 is connected to one end of a sleeve side wall 216, the other end of the first sleeve inner wall 231 is connected to the other end of a sleeve side wall 216, the other end of the fifth sleeve outer wall 215 is connected to one end of another sleeve side wall 216, and the other end of the fifth sleeve inner wall 235 is connected to the other end of another sleeve side wall 216;

[0088] The first sleeve outer wall 211 is parallel to the first sleeve inner wall 231, the second sleeve outer wall 212 is parallel to the second sleeve inner wall 232, the third sleeve outer wall 213 is parallel to the third sleeve inner wall 233, the fourth sleeve outer wall 214 is parallel to the fourth sleeve inner wall 234, and the fifth sleeve outer wall 215 is parallel to the fifth sleeve inner wall 235;

[0089] A first cavity 221 is formed between the first sleeve outer wall 211 and the first sleeve inner wall 231, a second cavity 222 is formed between the second sleeve outer wall 212 and the second sleeve inner wall 232, a third cavity 223 is formed between the third sleeve outer wall 213 and the third sleeve inner wall 233, a fourth cavity 224 is formed between the fourth sleeve outer wall 214 and the fourth sleeve inner wall 234, and a fifth cavity 225 is formed between the fifth sleeve outer wall 215 and the fifth sleeve inner wall 235. The first cavity 221, the second cavity 222, the third cavity 223, the fourth cavity 224 and the fifth cavity 225 are connected in sequence, and the first cavity 221, the second cavity 222, the third cavity 223, the fourth cavity 224 and the fifth cavity 225 are provided with an optical fiber ribbon 4;

[0090] The C-shaped groove of the inner wall is a receiving groove 24, and an inlet and outlet 23 is formed between the two sleeve side walls 216, and the angle between the two sleeve side walls 216 is 60°;

[0091] Two adjacent loose tubes 2 are nested with each other, the inner loose tube 2 is located in the accommodating groove 24 of the outer loose tube 2, the first sleeve outer wall 211 of the inner loose tube 2 and the first sleeve inner wall 231 of the outer loose tube 2 are equal in length and fit each other, a regular hexagonal reinforcement member 3 is provided in the accommodating groove 24 of the innermost loose tube 2, the inner wall body fits with five edges of the reinforcement member 3, the inlets and outlets 23 of all loose tubes 2 are oriented in the same direction, the same filling component 5 is provided in the inlets and outlets 23 of all loose tubes 2, the filling component 5 is in an isosceles trapezoid, the upper bottom of the filling component 5 fits with the last edge of the reinforcement member 3, the lower bottom of the filling component 5 forms a regular hexagon with the outer wall body, and the two waists of the filling component 5 fit with the corresponding sleeve side walls 216 of all loose tubes 2 respectively.

[0092] Example 3: Figures 8 to 10 , and refer to Figure 4A nested flame-retardant optical cable, comprising an outer sheath 1 and a cable core, wherein the cable core is located in the outer sheath 1, wherein the cable core is composed of two groups of loose tube assemblies and a reinforcement member 3, wherein the loose tube assembly is composed of three loose tubes 2, and the loose tube 2 is composed of a C-shaped outer wall body, a C-shaped inner wall body and two tube side walls 216;

[0093] The outer wall body is composed of a first sleeve outer wall 211, a second sleeve outer wall 212, a third sleeve outer wall 213, a fourth sleeve outer wall 214 and a fifth sleeve outer wall 215 of equal length. In the same cross section, one end of the first sleeve outer wall 211 is connected to one end of the second sleeve outer wall 212, the other end of the second sleeve outer wall 212 is connected to one end of the third sleeve outer wall 213, the other end of the third sleeve outer wall 213 is connected to one end of the fourth sleeve outer wall 214, and the other end of the fourth sleeve outer wall 214 is connected to one end of the fifth sleeve outer wall 215. The first sleeve outer wall 211 is 120° to the second sleeve outer wall 212, the second sleeve outer wall 212 is 120° to the third sleeve outer wall 213, the third sleeve outer wall 213 is 120° to the fourth sleeve outer wall 214, and the fourth sleeve outer wall 214 is 120° to the fifth sleeve outer wall 215.

[0094] The inner wall body is located in the C-shaped groove of the outer wall body, and the inner wall body is composed of a first sleeve inner wall 231, a second sleeve inner wall 232, a third sleeve inner wall 233, a fourth sleeve inner wall 234 and a fifth sleeve inner wall 235 of equal length. One end of the first sleeve inner wall 231 is connected to one end of the second sleeve inner wall 232, the other end of the second sleeve inner wall 232 is connected to one end of the third sleeve inner wall 233, and the other end of the third sleeve inner wall 233 is connected to one end of the third sleeve inner wall 234. connected to one end of the fourth sleeve inner wall 234, the other end of the fourth sleeve inner wall 234 is connected to one end of the fifth sleeve inner wall 235, and the first sleeve inner wall 231 and the second sleeve inner wall 232 are 120 degrees, the second sleeve inner wall 232 and the third sleeve inner wall 233 are 120 degrees, the third sleeve inner wall 233 and the fourth sleeve inner wall 234 are 120 degrees, and the fourth sleeve inner wall 234 and the fifth sleeve inner wall 235 are 120 degrees;

[0095] The other end of the first sleeve outer wall 211 is connected to one end of a sleeve side wall 216, the other end of the first sleeve inner wall 231 is connected to the other end of a sleeve side wall 216, the other end of the fifth sleeve outer wall 215 is connected to one end of another sleeve side wall 216, and the other end of the fifth sleeve inner wall 235 is connected to the other end of another sleeve side wall 216;

[0096] The first sleeve outer wall 211 is parallel to the first sleeve inner wall 231, the second sleeve outer wall 212 is parallel to the second sleeve inner wall 232, the third sleeve outer wall 213 is parallel to the third sleeve inner wall 233, the fourth sleeve outer wall 214 is parallel to the fourth sleeve inner wall 234, and the fifth sleeve outer wall 215 is parallel to the fifth sleeve inner wall 235;

[0097] A first cavity 221 is formed between the first sleeve outer wall 211 and the first sleeve inner wall 231, a second cavity 222 is formed between the second sleeve outer wall 212 and the second sleeve inner wall 232, a third cavity 223 is formed between the third sleeve outer wall 213 and the third sleeve inner wall 233, a fourth cavity 224 is formed between the fourth sleeve outer wall 214 and the fourth sleeve inner wall 234, and a fifth cavity 225 is formed between the fifth sleeve outer wall 215 and the fifth sleeve inner wall 235. The first cavity 221, the second cavity 222, the third cavity 223, the fourth cavity 224 and the fifth cavity 225 are connected in sequence, and the first cavity 221, the second cavity 222, the third cavity 223, the fourth cavity 224 and the fifth cavity 225 are provided with an optical fiber ribbon 4;

[0098] The C-shaped groove of the inner wall is a receiving groove 24, and an inlet and outlet 23 is formed between the two sleeve side walls 216, and the angle between the two sleeve side walls 216 is 60°;

[0099] In each group of loose tube assemblies, two adjacent loose tubes 2 are nested with each other, the inner loose tube 2 is located in the receiving groove 24 of the outer loose tube 2, the first tube outer wall 211 of the inner loose tube 2 and the first tube inner wall 231 of the outer loose tube 2 are equal in length and fit each other, the inner wall body fits with five edges of the reinforcement member 3, and the inlets and outlets 23 of all the loose tubes 2 are oriented in the same direction;

[0100] The reinforcement member 3 is composed of two fixing heads 31 and a connector 32. The fixing heads 31 are located at both ends of the connector 32. The fixing heads 31 are located in the receiving groove 24 of the innermost loose tube 2 of the corresponding loose tube assembly. The tube side walls 216 of all loose tubes 2 are in contact with the side walls of the corresponding connector 32.

[0101] Furthermore, when the reinforcement member 3 has three or more fixing heads 31 , more loose tube assemblies can be fixed on the reinforcement member 3 .

[0102] Example 4: Fig.11 and 12, and refer to Figures 1 to 3 A nested flame-retardant optical cable, comprising an outer sheath 1 and a cable core, wherein the cable core is located within the outer sheath 1, and the cable core is composed of three loose tubes 2, wherein the loose tubes 2 are composed of a C-shaped outer wall, a C-shaped inner wall and two tube side walls 216;

[0103] The outer wall body is composed of a first sleeve outer wall 211, a second sleeve outer wall 212, a third sleeve outer wall 213, a fourth sleeve outer wall 214 and a fifth sleeve outer wall 215 of equal length. In the same cross section, one end of the first sleeve outer wall 211 is connected to one end of the second sleeve outer wall 212, the other end of the second sleeve outer wall 212 is connected to one end of the third sleeve outer wall 213, the other end of the third sleeve outer wall 213 is connected to one end of the fourth sleeve outer wall 214, and the other end of the fourth sleeve outer wall 214 is connected to one end of the fifth sleeve outer wall 215. The first sleeve outer wall 211 is 120° to the second sleeve outer wall 212, the second sleeve outer wall 212 is 120° to the third sleeve outer wall 213, the third sleeve outer wall 213 is 120° to the fourth sleeve outer wall 214, and the fourth sleeve outer wall 214 is 120° to the fifth sleeve outer wall 215.

[0104] The inner wall body is located in the C-shaped groove of the outer wall body, and the inner wall body is composed of a first sleeve inner wall 231, a second sleeve inner wall 232, a third sleeve inner wall 233, a fourth sleeve inner wall 234 and a fifth sleeve inner wall 235 of equal length. One end of the first sleeve inner wall 231 is connected to one end of the second sleeve inner wall 232, the other end of the second sleeve inner wall 232 is connected to one end of the third sleeve inner wall 233, and the other end of the third sleeve inner wall 233 is connected to one end of the third sleeve inner wall 234. connected to one end of the fourth sleeve inner wall 234, the other end of the fourth sleeve inner wall 234 is connected to one end of the fifth sleeve inner wall 235, and the first sleeve inner wall 231 and the second sleeve inner wall 232 are 120 degrees, the second sleeve inner wall 232 and the third sleeve inner wall 233 are 120 degrees, the third sleeve inner wall 233 and the fourth sleeve inner wall 234 are 120 degrees, and the fourth sleeve inner wall 234 and the fifth sleeve inner wall 235 are 120 degrees;

[0105] The other end of the first sleeve outer wall 211 is connected to one end of a sleeve side wall 216, the other end of the first sleeve inner wall 231 is connected to the other end of a sleeve side wall 216, the other end of the fifth sleeve outer wall 215 is connected to one end of another sleeve side wall 216, and the other end of the fifth sleeve inner wall 235 is connected to the other end of another sleeve side wall 216;

[0106] The first sleeve outer wall 211 is parallel to the first sleeve inner wall 231, the second sleeve outer wall 212 is parallel to the second sleeve inner wall 232, the third sleeve outer wall 213 is parallel to the third sleeve inner wall 233, the fourth sleeve outer wall 214 is parallel to the fourth sleeve inner wall 234, and the fifth sleeve outer wall 215 is parallel to the fifth sleeve inner wall 235;

[0107] A first cavity 221 is formed between the first sleeve outer wall 211 and the first sleeve inner wall 231, a second cavity 222 is formed between the second sleeve outer wall 212 and the second sleeve inner wall 232, a third cavity 223 is formed between the third sleeve outer wall 213 and the third sleeve inner wall 233, a fourth cavity 224 is formed between the fourth sleeve outer wall 214 and the fourth sleeve inner wall 234, and a fifth cavity 224 is formed between the fifth sleeve outer wall 215 and the fifth sleeve inner wall 235. 225, the first cavity 221 and the second cavity 222 are separated by a partition wall 25, the second cavity 222 and the third cavity 223 are separated by a partition wall 25, the third cavity 223 and the fourth cavity 224 are separated by a partition wall 25, the fourth cavity 224 and the fifth cavity 225 are separated by a partition wall 25, and the first cavity 221, the second cavity 222, the third cavity 223, the fourth cavity 224 and the fifth cavity 225 are provided with an optical fiber ribbon 4;

[0108] The C-shaped groove of the inner wall is a receiving groove 24, and an inlet and outlet 23 is formed between the two sleeve side walls 216, and the angle between the two sleeve side walls 216 is 60°;

[0109] Two adjacent loose tubes 2 are nested with each other, the inner loose tube 2 is located in the receiving groove 24 of the outer loose tube 2, the first tube outer wall 211 of the inner loose tube 2 and the fourth tube inner wall 234 of the outer loose tube 2 are equal in length and fit each other, the inlet and outlet 23 of the two adjacent loose tubes 2 are in opposite directions, a regular hexagonal reinforcement member 3 is provided in the receiving groove 24 of the innermost loose tube 2, and the inner wall body fits with five sides of the reinforcement member 3.

[0110] In the nested structure flame-retardant optical cable described in Examples 1 to 4, the optical fiber ribbon 4 is formed by at least two optical fibers being ribboned together.

[0111] In the nested structure flame-retardant optical cable described in Examples 1 to 4, the material of the outer sheath 1 is low-density polyethylene, medium-density polyethylene, or high-density polyethylene.

[0112] In the nested structure flame-retardant optical cable described in Examples 1 to 4, the loose tube 2 is made of polybutylene terephthalate or modified polypropylene.

[0113] In the nested structure flame-retardant optical cable described in Examples 1 to 4, the material of the reinforcement member 3 is steel.

[0114] Furthermore, in the nested structure flame-retardant optical cable described in Embodiments 1 to 4, the angle between the directions of the inlet and outlet 23 of two adjacent loose tubes 2 may also be 60° or 120°.

[0115] Embodiment 5: A flame-retardant optoelectronic composite cable with a nested structure. This embodiment is basically the same as Embodiment 1, except that the optical fiber ribbon 4 is replaced by an electrical unit, and the electrical unit is composed of a conductor and an insulating layer extruded outside the conductor.

[0116] Embodiment 6: A flame-retardant optoelectronic composite cable with a nested structure. This embodiment is basically the same as Embodiment 2, except that the optical fiber ribbon 4 is replaced by an electrical unit, and the electrical unit is composed of a conductor and an insulating layer extruded outside the conductor.

[0117] Embodiment 7: A flame-retardant optoelectronic composite cable with a nested structure. This embodiment is basically the same as Embodiment 4, except that the optical fiber ribbon 4 is replaced by an electrical unit, and the electrical unit is composed of a conductor and an insulating layer extruded outside the conductor.

[0118] In the nested structure flame-retardant optoelectronic composite cable described in Examples 5 to 7, the material of the outer sheath 1 is low-density polyethylene, medium-density polyethylene, or high-density polyethylene.

[0119] In the nested structure flame-retardant optoelectronic composite cable described in Examples 5 to 7, the loose tube 2 is made of polybutylene terephthalate or modified polypropylene.

[0120] In the nested structure flame-retardant optoelectronic composite cable described in Examples 5 to 7, the material of the reinforcement member 3 is steel.

[0121] In the present application, the outer sheath 1 is a flame retardant material, such as flame retardant polyethylene, low smoke zero halogen or low smoke low halogen polyethylene or flame retardant PVC, etc.; or all materials are flame retardant.

[0122] This application has the following beneficial effects:

[0123] 1. Adjacent loose tubes 2 can be nested with each other, and the number of cores of the optical fiber ribbon 4 in the cable core can be expanded layer by layer as needed.

[0124] 2. Adjacent loose tubes 2 are fixed by nesting, and no other fixing components are needed, so cabling is convenient. During laying, each loose tube 2 can be separated individually, and it is only necessary to peel off the nested loose tubes in turn, so the construction is convenient.

[0125] 3. The loose tube 2 is an open regular hexagon, and the inner loose tube 2 and the outer loose tube 2 fit together, so that the nesting of two adjacent loose tubes 2 is tighter and the cable core is smaller.

[0126] 4. Due to the presence of the inlet and outlet 23 of the inner loose tube 2 between two adjacent loose tubes 2, the heat inside the cable can be dissipated faster.

[0127] 5. When the inlet and outlet 23 of the loose tube 2 in the loose tube assembly are oriented in the same direction, multiple loose tube assemblies can be fixed on the same reinforcement member 3 to increase the number of optical fiber ribbons 4 or electrical units in the optical cable or electrical cable.

[0128] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A flame-retardant optical cable with a nested structure, comprising an outer sheath (1) and a cable core, wherein the cable core is located within the outer sheath (1), characterized in that: The cable core is composed of at least two loose tubes (2), and the loose tubes (2) are composed of a C-shaped outer wall, a C-shaped inner wall and two tube side walls (216); The outer wall body is composed of a first sleeve outer wall (211), a second sleeve outer wall (212), a third sleeve outer wall (213), a fourth sleeve outer wall (214) and a fifth sleeve outer wall (215) of equal length. In the same cross section, one end of the first sleeve outer wall (211) is connected to one end of the second sleeve outer wall (212), the other end of the second sleeve outer wall (212) is connected to one end of the third sleeve outer wall (213), and the other end of the third sleeve outer wall (213) is connected to the fourth sleeve outer wall (214). One end of the outer wall (214) of the fourth sleeve is connected, the other end of the outer wall of the fourth sleeve (214) is connected to one end of the outer wall of the fifth sleeve (215), and the outer wall of the first sleeve (211) and the outer wall of the second sleeve (212) are at an angle of 120°, the outer wall of the second sleeve (212) and the outer wall of the third sleeve (213) are at an angle of 120°, the outer wall of the third sleeve (213) and the outer wall of the fourth sleeve (214) are at an angle of 120°, and the outer wall of the fourth sleeve (214) and the outer wall of the fifth sleeve (215) are at an angle of 120°; The inner wall body is located in the C-shaped groove of the outer wall body, and the inner wall body is composed of a first sleeve inner wall (231), a second sleeve inner wall (232), a third sleeve inner wall (233), a fourth sleeve inner wall (234), and a fifth sleeve inner wall (235) of equal length. One end of the first sleeve inner wall (231) is connected to one end of the second sleeve inner wall (232), the other end of the second sleeve inner wall (232) is connected to one end of the third sleeve inner wall (233), and the other end of the third sleeve inner wall (233) is connected to One end of the fourth sleeve inner wall (234) is connected, the other end of the fourth sleeve inner wall (234) is connected to one end of the fifth sleeve inner wall (235), and the first sleeve inner wall (231) and the second sleeve inner wall (232) are at an angle of 120°, the second sleeve inner wall (232) and the third sleeve inner wall (233) are at an angle of 120°, the third sleeve inner wall (233) and the fourth sleeve inner wall (234) are at an angle of 120°, and the fourth sleeve inner wall (234) and the fifth sleeve inner wall (235) are at an angle of 120°; The other end of the first sleeve outer wall (211) is connected to one end of a sleeve side wall (216), the other end of the first sleeve inner wall (231) is connected to the other end of a sleeve side wall (216), the other end of the fifth sleeve outer wall (215) is connected to one end of another sleeve side wall (216), and the other end of the fifth sleeve inner wall (235) is connected to the other end of another sleeve side wall (216); The first sleeve outer wall (211) is parallel to the first sleeve inner wall (231), the second sleeve outer wall (212) is parallel to the second sleeve inner wall (232), the third sleeve outer wall (213) is parallel to the third sleeve inner wall (233), the fourth sleeve outer wall (214) is parallel to the fourth sleeve inner wall (234), and the fifth sleeve outer wall (215) is parallel to the fifth sleeve inner wall (235); A first cavity (221) is formed between the first sleeve outer wall (211) and the first sleeve inner wall (231), a second cavity (222) is formed between the second sleeve outer wall (212) and the second sleeve inner wall (232), a third cavity (223) is formed between the third sleeve outer wall (213) and the third sleeve inner wall (233), a fourth cavity (224) is formed between the fourth sleeve outer wall (214) and the fourth sleeve inner wall (234), and a fifth cavity (225) is formed between the fifth sleeve outer wall (215) and the fifth sleeve inner wall (235), and optical fiber ribbons (4) are arranged in the first cavity (221), the second cavity (222), the third cavity (223), the fourth cavity (224) and the fifth cavity (225); The C-shaped groove of the inner wall is a receiving groove (24), an inlet and outlet (23) is formed between the two sleeve side walls (216), and the angle between the two sleeve side walls (216) is 60°; Two adjacent loose tubes (2) are nested with each other, and the inner loose tube (2) is located in the receiving groove (24) of the outer loose tube (2).

2. The nested structure flame-retardant optical cable according to claim 1, characterized in that: The first sleeve outer wall (211) of the inner loose sleeve (2) and the first sleeve inner wall (231) of the outer loose sleeve (2) are equal in length and fit each other; Alternatively, the first sleeve outer wall (211) of the inner loose sleeve (2) and the second sleeve inner wall (232) of the outer loose sleeve (2) are of equal length and fit each other; Alternatively, the first sleeve outer wall (211) of the inner loose sleeve (2) and the third sleeve inner wall (233) of the outer loose sleeve (2) are of equal length and fit each other; Alternatively, the first sleeve outer wall (211) of the inner loose sleeve (2) and the fourth sleeve inner wall (234) of the outer loose sleeve (2) are of equal length and fit each other; Alternatively, the first sleeve outer wall (211) of the inner loose sleeve (2) and the fifth sleeve inner wall (235) of the outer loose sleeve (2) are of equal length and fit each other; Alternatively, the second sleeve outer wall (212) of the inner loose sleeve (2) and the first sleeve inner wall (231) of the outer loose sleeve (2) are of equal length and fit each other.

3. A flame-retardant optical cable with a nested structure according to claim 2, characterized in that: A regular hexagonal reinforcing member (3) is arranged in the receiving groove (24) of the innermost loose tube (2), and the inner wall is in contact with five sides of the reinforcing member (3).

4. A flame-retardant optical cable with a nested structure, comprising an outer sheath (1) and a cable core, wherein the cable core is located within the outer sheath (1), characterized in that: The cable core is composed of at least two loose tube assemblies and a reinforcement member (3); The loose tube assembly is composed of at least two loose tubes (2), and the loose tubes (2) are composed of a C-shaped outer wall, a C-shaped inner wall and two tube side walls (216); The outer wall body is composed of a first sleeve outer wall (211), a second sleeve outer wall (212), a third sleeve outer wall (213), a fourth sleeve outer wall (214) and a fifth sleeve outer wall (215) of equal length. In the same cross section, one end of the first sleeve outer wall (211) is connected to one end of the second sleeve outer wall (212), the other end of the second sleeve outer wall (212) is connected to one end of the third sleeve outer wall (213), and the other end of the third sleeve outer wall (213) is connected to the fourth sleeve outer wall (214). One end of the outer wall (214) of the fourth sleeve is connected, the other end of the outer wall of the fourth sleeve (214) is connected to one end of the outer wall of the fifth sleeve (215), and the outer wall of the first sleeve (211) and the outer wall of the second sleeve (212) are at an angle of 120°, the outer wall of the second sleeve (212) and the outer wall of the third sleeve (213) are at an angle of 120°, the outer wall of the third sleeve (213) and the outer wall of the fourth sleeve (214) are at an angle of 120°, and the outer wall of the fourth sleeve (214) and the outer wall of the fifth sleeve (215) are at an angle of 120°; The inner wall body is located in the C-shaped groove of the outer wall body, and the inner wall body is composed of a first sleeve inner wall (231), a second sleeve inner wall (232), a third sleeve inner wall (233), a fourth sleeve inner wall (234), and a fifth sleeve inner wall (235) of equal length. One end of the first sleeve inner wall (231) is connected to one end of the second sleeve inner wall (232), the other end of the second sleeve inner wall (232) is connected to one end of the third sleeve inner wall (233), and the other end of the third sleeve inner wall (233) is connected to One end of the fourth sleeve inner wall (234) is connected, the other end of the fourth sleeve inner wall (234) is connected to one end of the fifth sleeve inner wall (235), and the first sleeve inner wall (231) and the second sleeve inner wall (232) are at an angle of 120°, the second sleeve inner wall (232) and the third sleeve inner wall (233) are at an angle of 120°, the third sleeve inner wall (233) and the fourth sleeve inner wall (234) are at an angle of 120°, and the fourth sleeve inner wall (234) and the fifth sleeve inner wall (235) are at an angle of 120°; The other end of the first sleeve outer wall (211) is connected to one end of a sleeve side wall (216), the other end of the first sleeve inner wall (231) is connected to the other end of a sleeve side wall (216), the other end of the fifth sleeve outer wall (215) is connected to one end of another sleeve side wall (216), and the other end of the fifth sleeve inner wall (235) is connected to the other end of another sleeve side wall (216); The first sleeve outer wall (211) is parallel to the first sleeve inner wall (231), the second sleeve outer wall (212) is parallel to the second sleeve inner wall (232), the third sleeve outer wall (213) is parallel to the third sleeve inner wall (233), the fourth sleeve outer wall (214) is parallel to the fourth sleeve inner wall (234), and the fifth sleeve outer wall (215) is parallel to the fifth sleeve inner wall (235); A first cavity (221) is formed between the first sleeve outer wall (211) and the first sleeve inner wall (231), a second cavity (222) is formed between the second sleeve outer wall (212) and the second sleeve inner wall (232), a third cavity (223) is formed between the third sleeve outer wall (213) and the third sleeve inner wall (233), a fourth cavity (224) is formed between the fourth sleeve outer wall (214) and the fourth sleeve inner wall (234), and a fifth cavity (225) is formed between the fifth sleeve outer wall (215) and the fifth sleeve inner wall (235), and optical fiber ribbons (4) are arranged in the first cavity (221), the second cavity (222), the third cavity (223), the fourth cavity (224) and the fifth cavity (225); The C-shaped groove of the inner wall is a receiving groove (24), an inlet and outlet (23) is formed between the two sleeve side walls (216), and the angle between the two sleeve side walls (216) is 60°; In each group of loose tube assemblies, two adjacent loose tubes (2) are nested with each other, the inner loose tube (2) is located in the receiving groove (24) of the outer loose tube (2), and the first tube outer wall (211) of the inner loose tube (2) and the first tube inner wall (231) of the outer loose tube (2) are equal in length and fit each other; The reinforcing member (3) is composed of a fixing head (31) and a connecting body (32) whose number is the same as the number of the loose tube assemblies. The fixing head (31) is located at the outer edge of the connecting body (32), and the fixing head (31) is nested and fixed with the receiving groove (24) of the innermost loose tube (2) of the corresponding loose tube assembly, and the tube side walls (216) of all the loose tubes (2) are in contact with the side walls of the corresponding connecting body (32).

5. A nested structure flame-retardant optical cable according to any one of claims 1 to 4, characterized in that: The first chamber (221), the second chamber (222), the third chamber (223), the fourth chamber (224) and the fifth chamber (225) are connected in sequence; or, the first chamber (221) and the second chamber (222) are separated by a partition wall (25), the second chamber (222) and the third chamber (223) are separated by a partition wall (25), the third chamber (223) and the fourth chamber (224) are separated by a partition wall (25), and the fourth chamber (224) and the fifth chamber (225) are separated by a partition wall (25).

6. A flame-retardant optoelectronic composite cable with a nested structure, comprising an outer sheath (1) and a cable core, wherein the cable core is located inside the outer sheath (1), characterized in that: The cable core is composed of at least two loose tubes (2), and the loose tubes (2) are composed of a C-shaped outer wall, a C-shaped inner wall and two tube side walls (216); The outer wall body is composed of a first sleeve outer wall (211), a second sleeve outer wall (212), a third sleeve outer wall (213), a fourth sleeve outer wall (214) and a fifth sleeve outer wall (215) of equal length. In the same cross section, one end of the first sleeve outer wall (211) is connected to one end of the second sleeve outer wall (212), the other end of the second sleeve outer wall (212) is connected to one end of the third sleeve outer wall (213), and the other end of the third sleeve outer wall (213) is connected to the fourth sleeve outer wall (214). One end of the outer wall (214) of the fourth sleeve is connected, the other end of the outer wall of the fourth sleeve (214) is connected to one end of the outer wall of the fifth sleeve (215), and the outer wall of the first sleeve (211) and the outer wall of the second sleeve (212) are at an angle of 120°, the outer wall of the second sleeve (212) and the outer wall of the third sleeve (213) are at an angle of 120°, the outer wall of the third sleeve (213) and the outer wall of the fourth sleeve (214) are at an angle of 120°, and the outer wall of the fourth sleeve (214) and the outer wall of the fifth sleeve (215) are at an angle of 120°; The inner wall body is located in the C-shaped groove of the outer wall body, and the inner wall body is composed of a first sleeve inner wall (231), a second sleeve inner wall (232), a third sleeve inner wall (233), a fourth sleeve inner wall (234), and a fifth sleeve inner wall (235) of equal length. One end of the first sleeve inner wall (231) is connected to one end of the second sleeve inner wall (232), the other end of the second sleeve inner wall (232) is connected to one end of the third sleeve inner wall (233), and the other end of the third sleeve inner wall (233) is connected to One end of the fourth sleeve inner wall (234) is connected, the other end of the fourth sleeve inner wall (234) is connected to one end of the fifth sleeve inner wall (235), and the first sleeve inner wall (231) and the second sleeve inner wall (232) are at an angle of 120°, the second sleeve inner wall (232) and the third sleeve inner wall (233) are at an angle of 120°, the third sleeve inner wall (233) and the fourth sleeve inner wall (234) are at an angle of 120°, and the fourth sleeve inner wall (234) and the fifth sleeve inner wall (235) are at an angle of 120°; The other end of the first sleeve outer wall (211) is connected to one end of a sleeve side wall (216), the other end of the first sleeve inner wall (231) is connected to the other end of a sleeve side wall (216), the other end of the fifth sleeve outer wall (215) is connected to one end of another sleeve side wall (216), and the other end of the fifth sleeve inner wall (235) is connected to the other end of another sleeve side wall (216); The first sleeve outer wall (211) is parallel to the first sleeve inner wall (231), the second sleeve outer wall (212) is parallel to the second sleeve inner wall (232), the third sleeve outer wall (213) is parallel to the third sleeve inner wall (233), the fourth sleeve outer wall (214) is parallel to the fourth sleeve inner wall (234), and the fifth sleeve outer wall (215) is parallel to the fifth sleeve inner wall (235); A first cavity (221) is formed between the first sleeve outer wall (211) and the first sleeve inner wall (231), a second cavity (222) is formed between the second sleeve outer wall (212) and the second sleeve inner wall (232), a third cavity (223) is formed between the third sleeve outer wall (213) and the third sleeve inner wall (233), a fourth cavity (224) is formed between the fourth sleeve outer wall (214) and the fourth sleeve inner wall (234), and a fifth cavity (225) is formed between the fifth sleeve outer wall (215) and the fifth sleeve inner wall (235), and optical fiber ribbons (4) are arranged in the first cavity (221), the second cavity (222), the third cavity (223), the fourth cavity (224) and the fifth cavity (225); A portion of the optical fiber ribbon (4) is replaced by an electrical unit, wherein the electrical unit is composed of a conductor and an insulating layer extruded outside the conductor; The C-shaped groove of the inner wall is a receiving groove (24), an inlet and outlet (23) is formed between the two sleeve side walls (216), and the angle between the two sleeve side walls (216) is 60°; Two adjacent loose tubes (2) are nested with each other, and the inner loose tube (2) is located in the receiving groove (24) of the outer loose tube (2).

7. The nested flame-retardant optoelectronic composite cable according to claim 6, characterized in that: The first sleeve outer wall (211) of the inner loose sleeve (2) and the first sleeve inner wall (231) of the outer loose sleeve (2) are equal in length and fit each other; Alternatively, the first sleeve outer wall (211) of the inner loose sleeve (2) and the second sleeve inner wall (232) of the outer loose sleeve (2) are of equal length and fit each other; Alternatively, the first sleeve outer wall (211) of the inner loose sleeve (2) and the third sleeve inner wall (233) of the outer loose sleeve (2) are of equal length and fit each other; Alternatively, the first sleeve outer wall (211) of the inner loose sleeve (2) and the fourth sleeve inner wall (234) of the outer loose sleeve (2) are of equal length and fit each other; Alternatively, the first sleeve outer wall (211) of the inner loose sleeve (2) and the fifth sleeve inner wall (235) of the outer loose sleeve (2) are of equal length and fit each other; Alternatively, the second sleeve outer wall (212) of the inner loose sleeve (2) and the first sleeve inner wall (231) of the outer loose sleeve (2) are of equal length and fit each other.

8. The nested flame-retardant optoelectronic composite cable according to claim 7, characterized in that: A regular hexagonal reinforcing member (3) is arranged in the receiving groove (24) of the innermost loose tube (2), and the inner wall is in contact with five sides of the reinforcing member (3).

9. A nested flame-retardant photovoltaic composite cable, comprising an outer sheath (1) and a cable core, wherein the cable core is located within the outer sheath (1), characterized in that: The cable core is composed of at least two loose tube assemblies and a reinforcement member (3); The loose tube assembly is composed of at least two loose tubes (2), and the loose tubes (2) are composed of a C-shaped outer wall, a C-shaped inner wall and two tube side walls (216); The outer wall body is composed of a first sleeve outer wall (211), a second sleeve outer wall (212), a third sleeve outer wall (213), a fourth sleeve outer wall (214) and a fifth sleeve outer wall (215) of equal length. In the same cross section, one end of the first sleeve outer wall (211) is connected to one end of the second sleeve outer wall (212), the other end of the second sleeve outer wall (212) is connected to one end of the third sleeve outer wall (213), and the other end of the third sleeve outer wall (213) is connected to the fourth sleeve outer wall (214). One end of the outer wall (214) of the fourth sleeve is connected, the other end of the outer wall of the fourth sleeve (214) is connected to one end of the outer wall of the fifth sleeve (215), and the outer wall of the first sleeve (211) and the outer wall of the second sleeve (212) are at an angle of 120°, the outer wall of the second sleeve (212) and the outer wall of the third sleeve (213) are at an angle of 120°, the outer wall of the third sleeve (213) and the outer wall of the fourth sleeve (214) are at an angle of 120°, and the outer wall of the fourth sleeve (214) and the outer wall of the fifth sleeve (215) are at an angle of 120°; The inner wall body is located in the C-shaped groove of the outer wall body, and the inner wall body is composed of a first sleeve inner wall (231), a second sleeve inner wall (232), a third sleeve inner wall (233), a fourth sleeve inner wall (234), and a fifth sleeve inner wall (235) of equal length. One end of the first sleeve inner wall (231) is connected to one end of the second sleeve inner wall (232), the other end of the second sleeve inner wall (232) is connected to one end of the third sleeve inner wall (233), and the other end of the third sleeve inner wall (233) is connected to One end of the fourth sleeve inner wall (234) is connected, the other end of the fourth sleeve inner wall (234) is connected to one end of the fifth sleeve inner wall (235), and the first sleeve inner wall (231) and the second sleeve inner wall (232) are at an angle of 120°, the second sleeve inner wall (232) and the third sleeve inner wall (233) are at an angle of 120°, the third sleeve inner wall (233) and the fourth sleeve inner wall (234) are at an angle of 120°, and the fourth sleeve inner wall (234) and the fifth sleeve inner wall (235) are at an angle of 120°; The other end of the first sleeve outer wall (211) is connected to one end of a sleeve side wall (216), the other end of the first sleeve inner wall (231) is connected to the other end of a sleeve side wall (216), the other end of the fifth sleeve outer wall (215) is connected to one end of another sleeve side wall (216), and the other end of the fifth sleeve inner wall (235) is connected to the other end of another sleeve side wall (216); The first sleeve outer wall (211) is parallel to the first sleeve inner wall (231), the second sleeve outer wall (212) is parallel to the second sleeve inner wall (232), the third sleeve outer wall (213) is parallel to the third sleeve inner wall (233), the fourth sleeve outer wall (214) is parallel to the fourth sleeve inner wall (234), and the fifth sleeve outer wall (215) is parallel to the fifth sleeve inner wall (235); A first cavity (221) is formed between the first sleeve outer wall (211) and the first sleeve inner wall (231), a second cavity (222) is formed between the second sleeve outer wall (212) and the second sleeve inner wall (232), a third cavity (223) is formed between the third sleeve outer wall (213) and the third sleeve inner wall (233), a fourth cavity (224) is formed between the fourth sleeve outer wall (214) and the fourth sleeve inner wall (234), and a fifth cavity (225) is formed between the fifth sleeve outer wall (215) and the fifth sleeve inner wall (235), and optical fiber ribbons (4) are arranged in the first cavity (221), the second cavity (222), the third cavity (223), the fourth cavity (224) and the fifth cavity (225); The C-shaped groove of the inner wall is a receiving groove (24), an inlet and outlet (23) is formed between the two sleeve side walls (216), and the angle between the two sleeve side walls (216) is 60°; In each group of loose tube assemblies, two adjacent loose tubes (2) are nested with each other, the inner loose tube (2) is located in the receiving groove (24) of the outer loose tube (2), and the first tube outer wall (211) of the inner loose tube (2) and the first tube inner wall (231) of the outer loose tube (2) are equal in length and fit each other; A portion of the optical fiber ribbon (4) is replaced by an electrical unit, wherein the electrical unit is composed of a conductor and an insulating layer extruded outside the conductor; The reinforcing member (3) is composed of a fixing head (31) and a connecting body (32) whose number is the same as the number of loose tube assemblies; the fixing head (31) is located at the outer edge of the connecting body (32); the fixing head (31) is nested and fixed with the receiving groove (24) of the innermost loose tube (2) of the corresponding loose tube assembly; and the tube side walls (216) of all the loose tubes (2) are fitted with the side walls of the corresponding connecting body (32).

10. The flame-retardant optoelectronic composite cable with a nested structure according to claim 9, characterized in that: The first cavity (221), the second cavity (222), the third cavity (223), the fourth cavity (224) and the fifth cavity (225) are connected in sequence; or, the first cavity (221) and the second cavity (222) are separated by a partition wall (25), the second cavity (222) and the third cavity (223) are separated by a partition wall (25), the third cavity (223) and the fourth cavity (224) are separated by a partition wall (25), and the fourth cavity (224) and the fifth cavity (225) are separated by a partition wall (25).

Images