Butterfly-shaped leading-in optical cable with combined structure

Abstract

The invention belongs to the technical field of optical cables, and discloses a composite structure butterfly-shaped leading-in optical cable which is provided with a cable core and at least one protection layer wrapping the cable core, the cross section of the cable core is square, and the cable core comprises 2n butterfly-shaped units, four first insulation wires and third insulation wires with the number equal to the square number of n; the cable is characterized in that in the cable core, n third insulated wires form a group, n groups are formed, the n groups of third insulated wires are stacked to form a power transmission unit with a square cross section, the power transmission unit is located in the center of the cable core, n / 2 butterfly-shaped units are arranged in the length direction and are tightly attached to and aligned with one side of the power transmission unit, four first insulated wires are located at the four corners of the cable core, and n is larger than or equal to 1 and smaller than or equal to 2. N is a positive even number. The device has the main beneficial technical effects of simple structure, easiness in manufacturing, low equipment requirement, high production speed, high percent of pass and easiness in stacking and management.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical cables, and in particular relates to a combined structure butterfly-shaped optical cable for indoor distribution. Background Art

[0002] In the prior art, when a butterfly-shaped optical cable for indoor distribution has multiple introduction units, they are usually distributed around a central strengthening member, forming a circular structure. For the increasingly numerous square or rectangular ducts, a large amount of space will be wasted during laying; this increases the cost for users to rent pipeline space resources; moreover, this structure is not convenient for manufacturing and is not conducive to simultaneously accessing multiple phases and multiple groups of power and electrical signals.

[0003] CN116577893A discloses a multi-unit structure butterfly-shaped optical cable for indoor distribution, which has a protective layer and at least three butterfly-shaped units. Each butterfly-shaped unit consists of an optical fiber, two butterfly-shaped unit strengthening members, and a butterfly-shaped unit protective layer. The cross-section of the butterfly-shaped unit protective layer is dumbbell-shaped. All butterfly-shaped units are located within the same protective layer. The protective layer is composed of butterfly-shaped unit accommodation bodies with the same number as the butterfly-shaped units. A central strengthening member accommodation cavity is formed in the middle of all butterfly-shaped unit accommodation bodies, and a central strengthening member is fixedly arranged in the central strengthening member accommodation cavity. CN118707678A discloses a multi-unit butterfly-shaped optical cable for indoor distribution, which has a strengthening member, n butterfly-shaped units, and a protective sleeve. The protective sleeve is composed of an outer body, n connecting bodies, and n inner bodies. The connecting bodies and the inner bodies divide the internal space of the protective sleeve into a central cavity, accommodation channels, and fitting channels. Each fitting channel is respectively connected to the central cavity and the accommodation channel at both ends of the fitting channel. Each butterfly-shaped unit consists of an I-shaped body bent upward and downward in the same direction, an optical fiber and a strengthening member located inside the I-shaped body. In the assembled state, the I-shaped body of each butterfly-shaped unit is embedded in the accommodation channel, the fitting channel, and the central cavity. The strengthening member is located in the center of the central cavity, and the strengthening member is in contact with the innermost surface of the I-shaped body of each butterfly-shaped unit. n≥3, and n is a positive integer.

[0004] CN220553019U discloses a multi-core structure butterfly-shaped optical cable for indoor distribution, which has multiple butterfly-shaped introduction units and inner / outer connecting bodies. Each butterfly-shaped introduction unit consists of first and second strengthening members, an optical fiber, first and second extension bodies, first and second connecting bodies, and first and second sheaths. The optical fiber is located inside the joint of the connecting bodies. The extension bodies have serially distributed and laterally penetrating connecting holes. A single butterfly-shaped introduction unit is an integral structure. The cross-section of the outer edge formed by all butterfly-shaped introduction units is circular or elliptical. A hollow inner cavity is formed inside all butterfly-shaped introduction units. The inner connecting body serially connects all the second extension bodies located inside in sequence, and the outer connecting body serially connects all the first extension bodies located outside in sequence.

[0005] CN115097588A discloses a multi-unit butterfly distribution optical cable, which has a plurality of butterfly units and a plurality of engaging components; the butterfly unit is composed of an optical fiber, a strengthening member, and a unit sheath, and the unit sheath is provided with a first fitting port and a second fitting port; the engaging component is composed of an engaging body; in the assembled state, the outer edges of all the butterfly units are on the same cylindrical surface, and one end of the engaging component between adjacent butterfly units is embedded in the second fitting port of one butterfly unit, and the other end of the engaging component between adjacent butterfly units is embedded in the first fitting port of another butterfly unit.

[0006] CN207908754U discloses a multi-core branchable dry distribution optical cable, which includes a microduct, a reinforcing member, a strengthening member, and an outer sheath. The strengthening member is located on two symmetrical sides of the microduct. The outer sheath wraps the outside of the strengthening member and the microduct and forms branch cables. The number of the branch cables is multiple and forms a circular shape, and the reinforcing member is located at the center of the circular shape formed by the multiple branch cables.

[0007] In the above-mentioned prior art, for the increasing square or rectangular ducts, a large amount of space will be wasted during laying; this will increase the rental cost of the pipeline space resources for users; the convenience of manufacturing, splicing, and assembling needs to be improved. Summary of the Invention

[0008] To solve the above problems, the object of the present invention is to disclose a combined structure butterfly distribution optical cable, which is realized by the following technical solutions.

[0009] A combined structure butterfly distribution optical cable has a cable core and at least one protective layer wrapped around the cable core. The cross-section of the cable core is square, and the cable core contains 2n butterfly units, four first insulated wires, and n² third insulated wires; its characteristics are as follows: The first insulated wire is composed of a first insulating layer and a first conductor. The first insulating layer wraps the first conductor, and the outer edge of the cross-section of the first insulating layer is square; The third insulated wire is composed of a third insulating layer and a third conductor. The third insulating layer wraps the third conductor, and the outer edge of the cross-section of the third insulating layer is square; The butterfly unit is composed of a protective sleeve and a butterfly introduction unit. The protective sleeve has an accommodation cavity inside, and the butterfly introduction unit is located in the accommodation cavity. The outer edge of the cross-section of the protective sleeve is rectangular; The butterfly introduction unit is composed of two strengthening members, an optical fiber, and a butterfly sheath. The cross-section of the butterfly sheath is rectangular. There is a tear notch recessed towards the center near the middle of the length direction of the butterfly sheath. The optical fiber is located in the butterfly sheath corresponding to the two tear notches, and the two strengthening members are respectively located in the butterfly sheath on both sides of the optical fiber; In the cable core, all the third insulating wires are grouped into n groups with n wires in each group. The n groups of third insulating wires are stacked to form a power transmission unit with a square cross-section. The power transmission unit is located in the center of the cable core. (n / 2) butterfly units are arranged along the length direction and are respectively closely attached to and aligned with one side of the power transmission unit. Four first insulating wires are located at the four corners of the cable core, where n≥, and n is a positive even number.

[0010] A combined structure butterfly lead-in optical cable has a cable core and at least one protective layer wrapped around the cable core. The cross-section of the cable core is square. The cable core contains 2n - 6 first butterfly units, 4 second butterfly units, four first insulating wires, and n² third insulating wires. It is characterized in that: The first insulating wire is composed of a first insulating layer and a first conductor. The first insulating layer wraps the first conductor, and the outer edge of the cross-section of the first insulating layer is square. The third insulating wire is composed of a third insulating layer and a third conductor. The third insulating layer wraps the third conductor, and the outer edge of the cross-section of the third insulating layer is square. The first butterfly unit is composed of a protective sleeve and a first butterfly lead-in unit. The protective sleeve has an accommodation cavity inside, and the first butterfly lead-in unit is located in the accommodation cavity. The outer edge of the cross-section of the protective sleeve is rectangular. The first butterfly lead-in unit is composed of two strengthening members, an optical fiber, and a butterfly sheath. The cross-section of the butterfly sheath is rectangular. There is a tear notch recessed towards the center near the center of the length direction of the butterfly sheath. The optical fiber is located in the butterfly sheath corresponding to the two tear notches. The two strengthening members are respectively located in the butterfly sheath on both sides of the optical fiber. The second butterfly unit is composed of a protective sleeve and a second butterfly lead-in unit. The protective sleeve has an accommodation cavity inside, and the second butterfly lead-in unit is located in the accommodation cavity. The outer edge of the cross-section of the protective sleeve is rectangular. The second butterfly lead-in unit is composed of two strengthening members, an optical fiber, a butterfly sheath, a rib, a suspension wire sheath, and a suspension wire. The cross-section of the butterfly sheath is rectangular. There is a tear notch recessed towards the center near the center of the length direction of the butterfly sheath. The optical fiber is located in the butterfly sheath corresponding to the two tear notches. The two strengthening members are respectively located in the butterfly sheath on both sides of the optical fiber. One end of the rib is connected to one end of the length direction of the butterfly sheath, and the other end of the rib is connected to the suspension wire sheath. The suspension wire is located in the suspension wire sheath. A peeling notch is formed at the connection of one end of the rib and one end of the length direction of the butterfly sheath. In the cable core, all the third insulating wires are grouped into n groups with n wires in each group. The n groups of third insulating wires are stacked to form a power transmission unit with a square cross-section. The power transmission unit is located in the center of the cable core. (n - 3) / 2 first butterfly units and 1 second butterfly unit are arranged along the length direction and are respectively closely attached to and aligned with one side of the power transmission unit. Four first insulating wires are located at the four corners of the cable core, where n≥4, and n is a positive odd number.

[0011] A combined structure butterfly-shaped fiber optic cable, having a cable core and at least one protective layer covering the cable core, the cross-section of the cable core being square, and the cable core containing four butterfly units, four first insulated wires, and four third insulated wires; characterized in that: The first insulated wire is composed of a first insulating layer and a first conductor, the first insulating layer covering the first conductor, and the outer edge of the cross-section of the first insulating layer being square; The third insulated wire is composed of a third insulating layer and a third conductor, the third insulating layer covering the third conductor, and the outer edge of the cross-section of the third insulating layer being square; The butterfly unit is composed of a protective sleeve and a butterfly-shaped fiber optic introducing unit, the protective sleeve having an accommodation cavity inside, the butterfly-shaped fiber optic introducing unit being located inside the accommodation cavity, and the outer edge of the cross-section of the protective sleeve being rectangular; The butterfly-shaped fiber optic introducing unit is composed of two reinforcing members, an optical fiber, and a butterfly-shaped sheath, the cross-section of the butterfly-shaped sheath being rectangular, and having a tear notch recessed towards the center near the center in the length direction of the butterfly-shaped sheath, the optical fiber being located in the butterfly-shaped sheath corresponding to the two tear notches, and the two reinforcing members being respectively located in the butterfly-shaped sheath on both sides of the optical fiber; In the cable core, the four third insulated wires are grouped into two groups with two wires in each group, and the two groups of third insulated wires are stacked to form a power transmission unit with a square cross-section, the power transmission unit being located in the center of the cable core, the length directions of the four butterfly units each closely adhering to and aligning with one side of the power transmission unit, and the four first insulated wires being located at the four corners of the cable core.

[0012] The above-mentioned combined structure butterfly-shaped fiber optic cable is characterized in that: it has nine third insulated wires. In the cable core, the nine third insulated wires are grouped into three groups with three wires in each group, and the three groups of third insulated wires are stacked to form a power transmission unit with a square cross-section, the power transmission unit being located in the center of the cable core, the length directions of the four butterfly units each closely adhering to and aligning with one side of the power transmission unit, and the four first insulated wires being located at the four corners of the cable core; the butterfly-shaped fiber optic introducing unit is composed of two reinforcing members, an optical fiber, a butterfly-shaped sheath, a rib, a suspension wire sheath, and a suspension wire, the cross-section of the butterfly-shaped sheath being rectangular, and having a tear notch recessed towards the center near the center in the length direction of the butterfly-shaped sheath, the optical fiber being located in the butterfly-shaped sheath corresponding to the two tear notches, the two reinforcing members being respectively located in the butterfly-shaped sheath on both sides of the optical fiber, one end of the rib being connected to one end of the length direction of the butterfly-shaped sheath, the other end of the rib being connected to the suspension wire sheath, the suspension wire being located in the suspension wire sheath, and a peeling notch being formed at the connection of one end of the rib and one end of the length direction of the butterfly-shaped sheath.

[0013] This application has the following main beneficial technical effects: simple structure, easy to manufacture, low equipment requirements, high production speed, high qualified rate, easy to stack and manage. Description of the Drawings

[0014] Figure 1 Schematic cross-sectional structure diagram of the cable core for Embodiment 1.

[0015] Figure 2 Schematic cross-sectional structure diagram of the butterfly lead-in unit used in Embodiment 1.

[0016] Figure 3 Schematic cross-sectional structure diagram of the cable core of Embodiment 2.

[0017] Figure 4 Schematic cross-sectional structure diagram of the butterfly lead-in unit used in Embodiment 2. Detailed implementation manners

[0018] In order to enable those skilled in the art to better understand and implement this patent, the marks in the accompanying drawings of the specification will now be described in detail in conjunction with the accompanying drawings.

[0019] In the figure: 11 - first insulating layer, 12 - first conductor, 21 - protective sleeve, 22 - accommodating cavity, 31 - third insulating layer, 32 - third conductor, 4 - butterfly lead-in unit, 41 - strengthening member, 42 - optical fiber, 43 - butterfly sheath, 44 - rib, 45 - suspension sheath, 46 - suspension wire, 431 - tear opening, 441 - peeling opening.

[0020] Embodiment 1: Please refer to Figure 1 and Figure 2 , a combined structure butterfly lead-in optical cable, having a cable core and at least one protective layer coated outside the cable core. The cross-section of the cable core is square, and the cable core contains four butterfly units, four first insulated wires, and four third insulated wires; characterized in that: The first insulated wire is composed of a first insulating layer 11 and a first conductor 12. The first insulating layer 11 coats the first conductor 12, and the outer edge of the cross-section of the first insulating layer 11 is square; The third insulated wire is composed of a third insulating layer 31 and a third conductor 32. The third insulating layer 31 coats the third conductor 32, and the outer edge of the cross-section of the third insulating layer 31 is square; The butterfly unit is composed of a protective sleeve 21 and a butterfly lead-in unit 4. The protective sleeve 21 has an accommodating cavity 22 inside, the butterfly lead-in unit 4 is located in the accommodating cavity 22, and the outer edge of the cross-section of the protective sleeve 21 is rectangular; The butterfly lead-in unit 4 is composed of two strengthening members 41, an optical fiber 42, and a butterfly sheath 43. The cross-section of the butterfly sheath 43 is rectangular. A tear opening 431 that is recessed towards the center is provided near the center in the length direction of the butterfly sheath 43. The optical fiber 42 is located in the butterfly sheath 43 corresponding to the two tear openings 431, and the two strengthening members 41 are respectively located in the butterfly sheath 43 on both sides of the optical fiber 42; In the cable core, four third insulating wires are grouped into two groups of two. The two groups of third insulating wires are stacked to form a power transmission unit with a square cross-section. The power transmission unit is located in the center of the cable core. The length directions of the four butterfly units are each closely attached to and aligned with one side of the power transmission unit. Four first insulating wires are located at the four corners of the cable core.

[0021] In this embodiment, the butterfly lead-in unit 4 is a non-self-supporting structure.

[0022] In this embodiment, the butterfly unit can also be composed only of the butterfly lead-in unit 4.

[0023] Embodiment 2: Please refer to Figure 3 and Figure 4 and refer to Figure 1 and Figure 2 A combined structure butterfly lead-in optical cable is basically the same as Embodiment 1, except that: it has nine third insulating wires. In the cable core, the nine third insulating wires are grouped into three groups of three. The three groups of third insulating wires are stacked to form a power transmission unit with a square cross-section. The power transmission unit is located in the center of the cable core. The length directions of the four butterfly units are each closely attached to and aligned with one side of the power transmission unit. Four first insulating wires are located at the four corners of the cable core; the butterfly lead-in unit 4 is composed of two strengthening members 41, an optical fiber 42, a butterfly sheath 43, a rib 44, a messenger sheath 45, and a messenger wire 46. The cross-section of the butterfly sheath 43 is rectangular. There is a tear opening 431 that is recessed towards the center near the middle in the length direction of the butterfly sheath 43. The optical fiber 42 is located in the butterfly sheath 43 at the corresponding positions of the two tear openings 431. The two strengthening members 41 are respectively located in the butterfly sheath 43 on both sides of the optical fiber 42. One end of the rib 44 is connected to one end of the length direction of the butterfly sheath 43, and the other end of the rib 44 is connected to the messenger sheath 45. The messenger wire 46 is located in the messenger sheath 45. A peeling opening 441 is formed at the connection of one end of the rib 44 to one end of the length direction of the butterfly sheath 43.

[0024] In this embodiment, the butterfly lead-in unit 4 is a self-supporting structure and can be used as a self-supporting application.

[0025] In this embodiment, the butterfly unit can also be composed only of the butterfly lead-in unit 4.

[0026] In this application, there can also be third insulating wires with a quantity of n squared. All the third insulating wires are grouped into n groups of n. The n groups of third insulating wires are stacked to form a power transmission unit with a square cross-section. The power transmission unit is located in the center of the cable core. The length directions of the four butterfly units are each closely attached to and aligned with one side of the power transmission unit. Four first insulating wires are located at the four corners of the cable core, where n≥4 and n is a positive integer.

[0027] Further, for the combined structure butterfly-shaped fiber optic cable introduced above, when n is an even number, it may also have 2n butterfly units described in Embodiment 1. n / 2 butterfly units are arranged along the length direction and are respectively closely attached to and aligned with one side of the power transmission unit. Four first insulating wires are located at the four corners of the cable core. When n is an odd number, it may also have 2n - 6 butterfly units described in Embodiment 1 and 4 butterfly units described in Embodiment 2. (n - 3) / 2 butterfly units described in Embodiment 1 and 1 butterfly unit described in Embodiment 2 are arranged along the length direction and are respectively closely attached to and aligned with one side of the power transmission unit. Four first insulating wires are located at the four corners of the cable core.

[0028] In this application, the butterfly unit, the first insulating wire, and the third insulating wire ensure the cross-sectional shape of the cable core.

[0029] Of course, as an improvement that does not require creativity, in fact, it is also possible to combine Embodiment 1, Embodiment 2, and the above solutions to form a rectangular cable core. In this case, only the number of butterfly units around the power transmission unit is different, or the shape of the butterfly unit is slightly different, or a combination of both is different.

[0030] In this application, each butterfly-shaped fiber optic cable introduction unit is an integral structure.

[0031] In this application, in the same embodiment, the shapes and sizes of the first insulating wires are the same; similarly, in the same embodiment, the shapes and sizes of the third insulating wires are the same; in the same embodiment, the shapes and sizes of the first insulating wire and the third insulating wire are the same.

[0032] In this application, in Embodiments 1 and 2, the length of the protective sleeve 21 is twice the side length of the third insulating wire; in Embodiment 2, the length of the protective sleeve 21 is twice the side length of the third insulating wire; in Embodiments 1 and 2, the cross-sections of the first insulating wire and the third insulating wire are both square; in Embodiments 1 and 2, the width of the protective sleeve 21 is equal to the side length of the first insulating wire, and in Embodiment 2, the width of the protective sleeve 21 is equal to the side length of the first insulating wire; the side lengths of the first insulating wire and the third insulating wire refer to the side lengths of their respective insulating layer outer edges; of course, in Embodiments 1 and 2, there is no protective sleeve 21, and only the butterfly-shaped fiber optic cable introduction unit exists. At this time, the length and width of the butterfly-shaped fiber optic cable introduction unit in Embodiment 1 respectively correspond to the length and width of the protective sleeve 21, and the length and width of the butterfly-shaped fiber optic cable introduction unit in Embodiment 2 respectively correspond to the length and width of the protective sleeve 21. In Embodiment 2, the length of the butterfly-shaped fiber optic cable introduction unit refers to the sum of the length of the butterfly-shaped sheath, the length of the stiffener, and the length of the suspension wire sheath.

[0033] For the combined structure butterfly-shaped fiber optic cable introduced in this application, it is characterized in that: the material of the first insulating layer 11 is plastic.

[0034] A combined structure butterfly-shaped fiber optic cable as described in this application is characterized in that the material of the third insulating layer 31 is plastic.

[0035] A combined structure butterfly-shaped fiber optic cable as described in this application is characterized in that the material of the protective sleeve 21 is plastic.

[0036] A combined structure butterfly-shaped fiber optic cable as described in this application is characterized in that the material of the first conductor 12 is copper or aluminum or copper alloy or aluminum alloy.

[0037] A combined structure butterfly-shaped fiber optic cable as described in this application is characterized in that the material of the third conductor 32 is copper or aluminum or copper alloy or aluminum alloy.

[0038] A combined structure butterfly-shaped fiber optic cable as described in this application is characterized in that the strengthening member 41 is steel wire or aluminum wire or iron wire or copper wire or glass fiber reinforced plastic rod or aramid yarn or glass fiber bundle.

[0039] A combined structure butterfly-shaped fiber optic cable as described in this application is characterized in that the model of the optical fiber 42 is G.652 or G.653 or G.655 or G.657 or A1a or A1b or A1c or A1d.

[0040] A combined structure butterfly-shaped fiber optic cable as described in this application is characterized in that the material of the butterfly-shaped sheath 43 is plastic.

[0041] A combined structure butterfly-shaped fiber optic cable as described in this application is characterized in that the material of the rib 44 is plastic.

[0042] A combined structure butterfly-shaped fiber optic cable as described in this application is characterized in that the material of the messenger sheath 45 is plastic.

[0043] A combined structure butterfly-shaped fiber optic cable as described in this application is characterized in that the messenger 46 is steel wire or aluminum wire or iron wire or copper wire or glass fiber reinforced plastic rod or aramid yarn or glass fiber bundle.

[0044] A combined structure butterfly-shaped fiber optic cable as described in this application is characterized in that the purposes of the tear opening 431 and the peeling opening 441 are for peeling. The former is to facilitate the extraction of the optical fiber for splicing, and the latter is to separate the rib 44, the messenger sheath 45, and the messenger 46, thereby facilitating matching with the optical fiber connector and facilitating clamping.

[0045] In this application, the third insulated wire can form multiple groups and multiple-phase power supplies; the butterfly unit is convenient for individual access to users, truly realizing fiber to the home and to the distribution box and data center; the first insulated wire can transmit greater power. Of course, the third insulated wire can also be used as a signal wire, such as a telephone line, a monitoring line, a data transmission line, a network line, etc.

[0046] In this application, due to the special combination of structures, multiple butterfly introduction units can be placed in the same cable, and the overall cross-section of the optical cable is square or rectangular, that is, the cross-section of the outermost protective layer is square or rectangular that matches the cable core. When laid in a rectangular or square space, such as a square duct, wire and cable trough, etc., the space resources can be utilized to the greatest extent.

[0047] This application is easy to manufacture, has a simple structure, does not require complex and expensive stranding equipment, has a high production speed, a high qualified rate, and is easy to stack and manage.

[0048] This application has the following main beneficial technical effects: simple structure, easy to manufacture, low equipment requirements, high production speed, high qualified rate, and easy to stack and manage.

[0049] The above embodiments are only the preferred technical solutions of the present invention and should not be regarded as limitations on the present invention. The protection scope of the present invention should be the technical solutions recorded in the claims, including 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 combined structure butterfly-shaped optical cable, comprising a cable core and at least one protective layer coated on the outside of the cable core, the cross section of the cable core is square, and the cable core contains 2n butterfly-shaped units, four first insulating wires, and third insulating wires of the square number of n; characterized in that: The first insulated wire is composed of a first insulating layer and a first conductor, the first insulating layer covers the first conductor, and the outer edge of the cross section of the first insulating layer is a square; The third insulated wire is composed of a third insulating layer and a third conductor, the third insulating layer covers the third conductor, and the outer edge of the cross section of the third insulating layer is a square; The butterfly unit is composed of a protective cover and a butterfly introduction unit. The protective cover has a receiving cavity inside, and the butterfly introduction unit is located in the receiving cavity. The outer edge of the cross section of the protective cover is a rectangle. The butterfly introduction unit is composed of two reinforcement members, optical fiber, and butterfly sheath. The cross section of the butterfly sheath is rectangular. There is a tearing hole concave toward the center near the center of the length direction of the butterfly sheath. The optical fiber is located in the butterfly sheath corresponding to the two tearing holes. The two reinforcement members are respectively located in the butterfly sheath on both sides of the optical fiber. In the cable core, all third insulating wires are grouped into n groups, and the n groups of third insulating wires are stacked into a transmission unit with a square cross-section. The transmission unit is located in the center of the cable core, and n / 2 butterfly units are arranged along the length direction and are respectively close to and aligned with one side of the transmission unit. The four first insulating wires are located at the four corners of the cable core, where n≥, n is a positive even number.

2. A combined structure butterfly-shaped optical cable, comprising a cable core and at least one protective layer coated on the outside of the cable core, the cross section of the cable core is square, and the cable core comprises 2n-6 first butterfly-shaped units, 4 second butterfly-shaped units, four first insulating wires, and the square number of n third insulating wires; characterized in that: The first insulated wire is composed of a first insulating layer and a first conductor, the first insulating layer covers the first conductor, and the outer edge of the cross section of the first insulating layer is a square; The third insulated wire is composed of a third insulating layer and a third conductor, the third insulating layer covers the third conductor, and the outer edge of the cross section of the third insulating layer is a square; The first butterfly-shaped unit is composed of a protective cover and a first butterfly-shaped introduction unit. The protective cover has an accommodating cavity inside. The first butterfly-shaped introduction unit is located in the accommodating cavity. The outer edge of the cross section of the protective cover is a rectangle. The first butterfly introduction unit is composed of two reinforcement members, an optical fiber, and a butterfly sheath. The cross section of the butterfly sheath is rectangular. There is a tear recessed toward the center near the center of the length direction of the butterfly sheath. The optical fiber is located in the butterfly sheath at the positions corresponding to the two tear recesses. The two reinforcement members are respectively located in the butterfly sheath on both sides of the optical fiber. The second butterfly-shaped unit is composed of a protective cover and a second butterfly-shaped introduction unit. The protective cover has an accommodating cavity inside. The second butterfly-shaped introduction unit is located in the accommodating cavity. The outer edge of the cross section of the protective cover is a rectangle. The second butterfly introduction unit is composed of two reinforcement members, optical fiber, butterfly sheath, rib, suspension wire sheath, and suspension wire. The cross section of the butterfly sheath is rectangular. The butterfly sheath has a tearing opening concave toward the center near the center in the length direction. The optical fiber is located in the butterfly sheath corresponding to the two tearing openings. The two reinforcement members are respectively located in the butterfly sheath on both sides of the optical fiber. One end of the rib is connected to one end of the butterfly sheath in the length direction, and the other end of the rib is connected to the suspension wire sheath. The suspension wire is located in the suspension wire sheath. A stripping opening is formed at the connection between one end of the rib and one end of the butterfly sheath in the length direction. In the cable core, all third insulating wires are grouped into n groups, and the n groups of third insulating wires are stacked into a transmission unit with a square cross-section. The transmission unit is located in the center of the cable core. (n-3) / 2 first butterfly units and 1 second butterfly unit are arranged along the length direction and are respectively close to and aligned with one side of the transmission unit. The four first insulating wires are located at the four corners of the cable core, where n≥4, and n is a positive odd number.

3. A combined structure butterfly-shaped optical cable according to claim 1 or claim 2, characterized in that: The material of the first insulating layer is plastic.

4. A combined structure butterfly-shaped optical cable according to claim 1 or claim 2, characterized in that: The material of the third insulating layer is plastic.

5. A combined structure butterfly-shaped optical cable according to claim 1 or claim 2, characterized in that: The material of the protective cover is plastic.

6. A combined structure butterfly-shaped optical cable according to claim 1 or claim 2, characterized in that: The material of the first conductor is copper or aluminum or a copper alloy or an aluminum alloy.

7. A combined structure butterfly-shaped optical cable according to claim 1 or claim 2, characterized in that: The material of the third conductor is copper or aluminum or a copper alloy or an aluminum alloy.

8. A combined structure butterfly-shaped optical cable according to claim 1 or claim 2, characterized in that: The model of the optical fiber is G.652, G.653, G.655, G.657, A1a, A1b, A1c, or A1d.

9. The combined structure butterfly-shaped optical cable according to claim 2, characterized in that: The material of the butterfly sheath is plastic; the reinforcement member is steel wire or aluminum wire or iron wire or copper wire or glass fiber reinforced plastic rod or aramid yarn or glass fiber bundle.

10. The combined structure butterfly-shaped optical cable according to claim 2, characterized in that: The material of the reinforcement is plastic; the material of the suspension wire sheath is plastic; the suspension wire is steel wire or aluminum wire or iron wire or copper wire or glass fiber reinforced plastic rod or aramid yarn or glass fiber bundle.

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