CN220207944U - Butterfly-shaped lead-in optical cable with a plurality of lead-in units - Google Patents

Abstract

The utility model belongs to the technical field of optical cables, and discloses a butterfly-shaped lead-in optical cable with a plurality of lead-in units, which is provided with a cable core and is characterized in that: the cable core is composed of four subunits; each subunit consists of a unit shell, two first type introducing units and a second type introducing unit, wherein the first type introducing units are positioned in the unit shell, and the first type introducing units are positioned at two sides of the second type introducing units; the outer edge of the cross section of the unit shell is regular octagon; the four unit shells are spliced to form a central hole with a square cross section, an outer cavity is formed outside the spliced part of the adjacent unit shells, and the unit shells of the four subunits are integrally formed, or the unit shells of the four subunits are integrally formed through adhesion or fusion. The utility model has the following main beneficial technical effects: the number of the introducing units is more, the adaptation and the matching performance of the introducing units and the optical interfaces of the optical equipment are better, the space utilization rate is higher, and photoelectric signals can be transmitted simultaneously.

Description

Butterfly-shaped lead-in optical cable with a plurality of lead-in units

Technical Field

The utility model belongs to the technical field of optical cables, and particularly discloses a butterfly-shaped lead-in optical cable with a plurality of lead-in units.

Background

In the prior art, the butterfly-shaped lead-in optical cable or the butterfly-shaped lead-in unit which is frequently used mainly has two sizes, one of which is: a height nominal value of 3mm and a width nominal value of 2mm; and two are as follows: a height nominal value of 2mm and a width nominal value of 1.6mm; the optical fiber connectors can be respectively matched with optical fiber connectors which are widely used at present, the optical fiber connectors can be inserted into optical receiving and transmitting ports of corresponding optical equipment, and the shape of the butterfly-shaped lead-in optical cable or the butterfly-shaped lead-in unit is shown in the national communication industry standard YD/1997-2009 butterfly-shaped lead-in optical cable for access network of the people's republic of China. In the prior art, the same optical cable has only one type of butterfly-shaped lead-in optical cable or butterfly-shaped lead-in unit, however, in actual use, the optical equipment purchased by a user generally has only one type of optical interface, the sizes of the optical interfaces are relatively random, and different manufacturers have different optical interfaces, so that the optical cable with a single structure cannot be used smoothly by the user, thereby bringing trouble to the user, and simultaneously, the sales and the use of the optical cable are also influenced.

CN114942498A discloses a butterfly-shaped lead-in optical cable for communication, which is provided with a jogged component, a plurality of protection bodies, a plurality of butterfly-shaped lead-in units, a protection layer and an outer sheath, and is characterized in that: the embedded component is composed of a plurality of embedded bodies, the butterfly-shaped introducing unit is located in each of the embedded bodies, the other end of each embedded body is embedded in one of the embedded cavities of one of the embedded bodies, all the embedded bodies are combined with the embedded component to form a regular polyhedron shape, and the protective layer covers all the embedded bodies. The cable core with the regular hexagonal section is formed by the configuration of the protection body with the prismatic section, but the cable core is limited to three butterfly units and cannot meet the requirements of users with multiple units.

CN115079362a discloses a butterfly-shaped optical cable with a plurality of special-shaped introducing units, which is provided with a protecting component and a special-shaped introducing unit, and is characterized in that: the special-shaped introducing unit consists of an optical fiber, a pair of reinforcing members and a first special-shaped sheath; the protection part consists of an outer sheath and a second special-shaped sheath, the second special-shaped sheath consists of a first special-shaped body and a second special-shaped body, one side edge of the second special-shaped sheath is combined with the inner wall of the outer sheath, the inner wall of the outer sheath and the second special-shaped sheath jointly enclose a containing cavity, special-shaped introducing units are positioned in the containing cavity and are distributed with the second special-shaped sheath at intervals along the clockwise or anticlockwise direction of the inner wall of the outer sheath, and the outer edges of any two special-shaped introducing units, which are close to the center of the optical cable, are circumscribed; each second special-shaped sheath is embedded in the side edge of the special-shaped introducing unit adjacent to the second special-shaped sheath, and the second special-shaped sheath can only provide three special-shaped introducing units respectively and cannot meet the requirements of a large number of users.

Disclosure of Invention

In order to solve the above problems, an object of the present utility model is to disclose a butterfly drop cable having a plurality of drop units, which is realized by adopting the following technical scheme.

A butterfly drop cable having a plurality of drop units, having a cable core, characterized by: the cable core is composed of four subunits; each subunit consists of a unit shell, two first type introducing units and a second type introducing unit, wherein the first type introducing units are positioned in the unit shell, and the first type introducing units are positioned at two sides of the second type introducing units; the outer edge of the cross section of the unit shell is regular octagon; the four unit shells are spliced to form a central hole with a square cross section, an outer cavity is formed outside the spliced part of the adjacent unit shells, and the unit shells of the four subunits are integrally formed, or the unit shells of the four subunits are integrally formed through adhesion or fusion.

The butterfly-shaped drop cable with a plurality of drop units described above is characterized in that: and also has a fiber optic ribbon or strength member positioned within the central bore.

The butterfly-shaped lead-in optical cable with a plurality of lead-in units comprises a cable core, a protective layer and an outer sheath, wherein the protective layer covers the cable core; the method is characterized in that: the cable core is composed of an optical fiber ribbon, four subunits and four filling components; each subunit consists of a unit shell, two first type introducing units and a second type introducing unit, wherein the first type introducing units are positioned in the unit shell, and the first type introducing units are positioned at two sides of the second type introducing units; the outer edge of the cross section of the unit shell is regular octagon; each filling part consists of a filling body and an insulated wire positioned inside the filling body; the four unit shells are spliced to form a central hole with a square cross section, an outer cavity is formed outside the spliced part of the adjacent unit shells, and the filling component is positioned in the outer cavity; the optical fiber ribbon is positioned within the central bore.

The butterfly-shaped lead-in optical cable with a plurality of lead-in units comprises a cable core, a protective layer and an outer sheath, wherein the protective layer covers the cable core; the method is characterized in that: the cable core is composed of four subunits and four filling components; each subunit consists of a unit shell, two first type introducing units and a second type introducing unit, wherein the first type introducing units are positioned in the unit shell, and the first type introducing units are positioned at two sides of the second type introducing units; the outer edge of the cross section of the unit shell is regular octagon; each filling part consists of a filling body and an insulated wire positioned inside the filling body; the four unit shells are spliced to form a central hole with a square cross section, an outer cavity is formed outside the spliced part of the adjacent unit shells, and the filling component is positioned in the outer cavity; the unit housings of the four sub-units are integrally formed, or the unit housings of the four sub-units are integrally formed by bonding or fusing.

The utility model has the following main beneficial technical effects: the number of the introducing units is more, the adaptation and the matching performance of the introducing units and the optical interfaces of the optical equipment are better, the space utilization rate is higher, and photoelectric signals can be transmitted simultaneously.

Drawings

Fig. 1 is a schematic perspective view of an embodiment example 1 after a section of dissection.

Fig. 2 is an enlarged schematic cross-sectional structure of fig. 1.

Fig. 3 is a schematic cross-sectional structure of the cable core of embodiment 1 with the central optical fiber ribbon removed.

Fig. 4 is a schematic perspective view of a section of the subunit of the cable core of example 1 after dissection.

Fig. 5 is an enlarged schematic cross-sectional structure of fig. 4.

Fig. 6 is a schematic perspective view of the introduction unit removed 4.

Fig. 7 is an enlarged schematic cross-sectional structure of fig. 6.

Fig. 8 is a schematic perspective view of the embodiment 2 after a section of dissection.

Fig. 9 is an enlarged schematic cross-sectional structure of fig. 8.

Detailed Description

So that those skilled in the art can better understand and practice the present patent, reference will now be made in detail to the drawings, which are illustrated in the accompanying drawings.

In the figure: 1-optical fiber ribbon, 2-first introduction unit, 3-unit housing, 4-second introduction unit, 5-filling member, 6-protective layer, 7-outer jacket, 10-center hole, 21-introduction jacket, 22-optical fiber, 23-reinforcing member, 24-tear port, 31-first outer side wall, 32-second outer side wall, 33-third outer side wall, 34-fourth outer side wall, 35-fifth outer side wall, 36-sixth outer side wall, 37-seventh outer side wall, 38-eighth outer side wall, 301-first accommodation cavity, 302-second accommodation cavity, 303-third accommodation cavity, 304-fourth accommodation cavity, 305-fifth accommodation cavity, 311-first inner side wall, 313-second inner side wall, 331-third inner side wall, 371-fourth inner side wall, 357-fifth inner side wall, 351-sixth inner side wall, 41-first jacket, 42-second protective jacket, 43-third protective jacket, 44-reinforcing member, 45-bonding layer, 46-second accommodation cavity, 311-third insulation, 54-third insulation jacket, 52-fourth accommodation cavity, 55-third insulation jacket.

Example 1

Referring to fig. 1 to 7, a butterfly-shaped drop cable with a plurality of drop units comprises a cable core, a protective layer 6 and an outer sheath 7, wherein the protective layer covers the cable core, and the outer sheath covers the protective layer; the method is characterized in that: the cable core is composed of an optical fiber ribbon 1, four subunits and four filling components 5; each subunit is composed of a unit housing 3, two first type introducing units 2 and a second type introducing unit 4, wherein the first type introducing units are positioned at two sides of the second type introducing unit; the outer edge of the cross section of the unit shell is regular octagon; each filling part 5 is composed of a filling body and an insulated wire positioned inside the filling body; the four unit shells are spliced to form a central hole 10 with a square cross section, an outer cavity 60 is formed outside the spliced part of the adjacent unit shells, and the filling component is positioned in the outer cavity; fiber optic ribbon 1 is positioned within the central bore.

The butterfly-shaped drop cable with a plurality of drop units described above is characterized in that: the unit housing 3 is formed by a first outer side wall body 31, a second outer side wall body 32, a third outer side wall body 33, a fourth outer side wall body 34, a fifth outer side wall body 35, a sixth outer side wall body 36, a seventh outer side wall body 37, an eighth outer side wall body 38, a first inner side wall body 311, a second inner side wall body 313, a third inner side wall body 331, a fourth inner side wall body 371, a fifth inner side wall body 357 and a sixth inner side wall body 351, the unit housing is of an integrated structure, the head and tail ends of the first to eighth outer side wall bodies are sequentially connected, the tail end of the eighth outer side wall body is connected with the head end of the first outer side wall body, and the outer edge of the cross section of the unit housing is in a regular octagon shape; one end of the first inner sidewall body 311 is connected to the center of the inner edge of the first outer sidewall body 31, the other end of the first inner sidewall body 311 is connected to one end of the second inner sidewall body 313, the other end of the second inner sidewall body 313 is connected to the other end of the third inner sidewall body 331, one end of the third inner sidewall body 331 is connected to the center of the inner edge of the third outer sidewall body 33, the first inner sidewall body 311 is parallel to the third outer sidewall body 33, the second inner sidewall body 313 is parallel to the second outer sidewall body 32, and the third inner sidewall body 331 is parallel to the third inner sidewall body 331; one end of the fourth inner sidewall 371 is connected to the center of the inner edge of the seventh outer sidewall 37, the other end of the fourth inner sidewall 371 is connected to one end of the fifth inner sidewall 357, the other end of the fifth inner sidewall 357 is connected to the other end of the sixth inner sidewall 351, one end of the sixth inner sidewall 351 is connected to the center of the inner edge of the fifth outer sidewall 35, the fourth inner sidewall 371 is parallel to the fifth outer sidewall 35, the fifth inner sidewall 357 is parallel to the sixth outer sidewall 36, and the sixth inner sidewall 351 is parallel to the seventh outer sidewall 37; the first outer sidewall 31, the second outer sidewall 32, the third outer sidewall 33, the third inner sidewall 331, the second inner sidewall 313, and the first inner sidewall 311 define a first accommodating cavity 301; the fifth outer sidewall 35, the sixth outer sidewall 36, the seventh outer sidewall 37, the fourth inner sidewall 371, the fifth inner sidewall 357, and the sixth inner sidewall 351 enclose a second accommodating cavity 302; the first outer sidewall 31, the first inner sidewall 311, the second inner sidewall 313, the third inner sidewall 331, the third outer sidewall 33, the fourth outer sidewall 34, the fifth outer sidewall 35, the sixth inner sidewall 351, the fifth inner sidewall 357, the fourth inner sidewall 371, the seventh outer sidewall 37, and the eighth outer sidewall 38 define a large accommodating cavity; the first outer sidewall 31, the first inner sidewall 311, the fourth inner sidewall 371, the seventh outer sidewall 37, and the eighth outer sidewall 38 enclose a third accommodating cavity 303; the second inner sidewall 313 and the fifth inner sidewall 357 enclose a fifth accommodating chamber 305; the third inner sidewall 331, the third outer sidewall 33, the fourth outer sidewall 34, the fifth outer sidewall 35, and the sixth inner sidewall 351 define a fourth accommodating cavity 304; the large accommodating cavity is composed of a third accommodating cavity 303, a fifth accommodating cavity 305 and a fourth accommodating cavity 304, the fifth accommodating cavity 305 is communicated with the third accommodating cavity 303, and the fifth accommodating cavity 305 is communicated with the fourth accommodating cavity 304.

The butterfly-shaped drop cable with a plurality of drop units described above is characterized in that: the first type of introducing unit 2 is composed of an introducing sheath 21, an optical fiber 22 and two reinforcing members 23, the cross section of the introducing sheath is a hexagon with opposite sides parallel, the distance between a group of parallel sides with the smallest distance is called the width of the first type of introducing unit, the length between two peaks with the largest distance is called the height of the first type of introducing unit, the introducing sheath integrally covers the optical fiber 22 and the reinforcing members 23, the optical fiber is positioned in the center of the introducing sheath, the two reinforcing members and the optical fiber are distributed along the height direction of the first type of introducing unit, the two reinforcing members are respectively positioned at two sides of the optical fiber, and a concave tearing opening 24 is formed in the introducing sheath passing through the center of the optical fiber and being perpendicular to the height direction of the first type of introducing unit; the first introduction unit 2 is located in the first accommodation chamber 301 and the second accommodation chamber 302.

The butterfly-shaped drop cable with a plurality of drop units described above is characterized in that: the second introducing unit 4 is composed of a protective sleeve body, two reinforcing pieces 44 and an optical fiber belt, wherein the optical fiber belt is composed of a plurality of optical fibers 45 which are arranged in a row and are not contacted with each other and an adhesive layer 46 which wraps all the optical fibers, the protective sleeve body is composed of a first protective sleeve 41, a second protective sleeve 42 and a third protective sleeve 43, the third protective sleeve is positioned between the first protective sleeve and the second protective sleeve and is connected with the first protective sleeve and the second protective sleeve into a whole, the two reinforcing pieces are respectively positioned in the first protective sleeve and the second protective sleeve, and the optical fiber belt is positioned in the third protective sleeve; the second introduction unit 4 is located in the large receiving chamber.

The butterfly-shaped drop cable with a plurality of drop units described above is characterized in that: the filling body is composed of a first filling body 51, a second filling body 52 and a third filling body 53, the filling body is of an integrated structure, the third filling body 53 connects the first filling body 51 and the second filling body 52 which are positioned on two sides of the third filling body 53, the outer edge of the cross section of the filling body is formed by connecting a circular arc section, a first straight line section of the first filling body, a first straight line section of the third filling body, a second straight line section of the third filling body and a first straight line section of the second filling body, the outer edge of the cross section of the filling body is of a closed structure, and the first straight line section of the third filling body is perpendicular to the second straight line section of the third filling body.

The butterfly-shaped drop cable with a plurality of drop units described above is characterized in that: the insulated wire is composed of a conductor 54 and an insulating sheath 55 covering the conductor.

The butterfly-shaped drop cable with a plurality of drop units described above is characterized in that: the top of the outer chamber 60 is at a right angle.

The butterfly-shaped drop cable with a plurality of drop units described above is characterized in that: in any plane perpendicular to the axis of the butterfly drop cable: the length of the first straight line section of the first filling body, the length of the first straight line section of the second filling body, the length of the first straight line section of the third filling body and the length of the second straight line section of the third filling body are all equal.

The butterfly-shaped drop cable with a plurality of drop units described above is characterized in that: in any plane perpendicular to the axis of the butterfly drop cable: the length of the first straight line section of the first filling body is equal to the length of the outer edge of any outer side wall body of the unit shell.

The butterfly-shaped drop cable with a plurality of drop units described above is characterized in that: the cross section of the large accommodating cavity is dumbbell-shaped or deformed dumbbell-shaped, and the outer edge of the cross section of the corresponding second type introducing unit 4 is also dumbbell-shaped or deformed dumbbell-shaped.

The butterfly-shaped drop cable with a plurality of drop units described above is characterized in that: the shape of the outer edge of the cross section of the first introduction unit 2 is similar to the shape of the first accommodation chamber 301 and the second accommodation chamber 302.

The butterfly-shaped drop cable with a plurality of drop units described above is characterized in that: the unit housing 3 is of symmetrical construction.

The butterfly-shaped drop cable with a plurality of drop units described above is characterized in that: the filler member 5 is of symmetrical construction.

The butterfly-shaped drop cable with a plurality of drop units described above is characterized in that: the first introduction unit 2 and the second introduction unit 4 are each of symmetrical structure.

The butterfly-shaped drop cable with a plurality of drop units described above is characterized in that: the fiber optic ribbon within the central bore 10 may also be replaced with a strength member that mates with the central bore 10 for increasing the strength of the cable; and even the central bore 10 may be empty.

The butterfly-shaped drop cable with a plurality of drop units described above is characterized in that: ribbon 1 is a prior art ribbon as recommended by the communication industry standard YD/T979 of the people's republic of China.

Example 2 of the embodiment

Please refer to fig. 8 and 9, and refer to fig. 1 to 7, a butterfly drop cable having a plurality of drop units is basically the same as embodiment 1, except that: one is as follows: the filling part 5, the protective layer 6 and the outer sheath 7 are not arranged; and two are as follows: the four subunits are integrally formed, that is, the unit housings 3 of the four subunits are integrally formed, or the unit housings 3 of the four subunits are integrally formed by bonding or fusing, however, the whole of the four subunits of the integral structure in this embodiment may also be referred to as a cable core, which may also be used in embodiment 1.

In this application, the preferred structures are: the second introduction unit 4 has a nominal height of 3mm and a nominal width of 2mm in cross section.

In this application, the preferred structures are: the first introduction unit 2 has a nominal height of 2mm and a nominal width of 1.6mm in cross section.

A butterfly drop cable having a plurality of drop units as described herein, characterized by: the material of the protective layer 6 is polyester tape or polyester binding yarn or water blocking tape or non-woven fabric or steel tape or aluminum tape.

A butterfly drop cable having a plurality of drop units as described herein, characterized by: the material of the outer sheath 7 is plastic.

A butterfly drop cable having a plurality of drop units as described herein, characterized by: the material introduced into the sheath 21 is plastic.

A butterfly drop cable having a plurality of drop units as described herein, characterized by: the type of the optical fiber 22 is g.652 or g.653 or g.654 or g.655 or g.656 or g.657 or A1a or A1b or A1c or A1d or A1e.

A butterfly drop cable having a plurality of drop units as described herein, characterized by: the material of the reinforcement 23 is steel wire or copper wire or aluminum wire or lead wire or glass fiber reinforced plastic rod or aramid yarn or glass fiber yarn.

A butterfly drop cable having a plurality of drop units as described herein, characterized by: the material of the unit case 3 is plastic or steel or iron or aluminum or copper or aluminum alloy or copper alloy.

A butterfly drop cable having a plurality of drop units as described herein, characterized by: the material of the protective sleeve body is plastic.

A butterfly drop cable having a plurality of drop units as described herein, characterized by: the material of the reinforcement 44 is steel wire or copper wire or aluminum wire or lead wire or glass fiber reinforced plastic rod or aramid yarn or glass fiber yarn.

A butterfly drop cable having a plurality of drop units as described herein, characterized by: the type of the optical fiber 45 is g.652 or g.653 or g.654 or g.655 or g.656 or g.657 or A1a or A1b or A1c or A1d or A1e.

A butterfly drop cable having a plurality of drop units as described herein, characterized by: the material of the adhesive layer 46 is plastic.

A butterfly drop cable having a plurality of drop units as described herein, characterized by: the material filling the body is plastic.

A butterfly drop cable having a plurality of drop units as described herein, characterized by: the material of conductor 54 is copper or aluminum or a copper alloy or an aluminum alloy.

A butterfly drop cable having a plurality of drop units as described herein, characterized by: the material of the insulating sheath 55 is plastic.

Compared with the prior art, the butterfly-shaped introducing optical cable has eight first introducing units 2 and four second introducing units 4, and the unit quantity is enlarged, so that the user demands of most single floors can be met.

In the application, the two types of the introduction units are convenient for users, and the users do not need to worry about the problem of unmatched sizes of the optical interfaces when buying the optical equipment.

In the present application, each unit case has two size types of introduction units therein, which are extremely convenient to use as sub-units, and the unit case may be made as a relatively thin case as long as it has sufficient strength; and the unit shell is of a regular octahedron structure, the space inside the unit shell is fully utilized, and the space is effectively saved.

In the application, the cable is also provided with an insulated wire which can be used as a power transmission component to enable strong electricity and optical signals to enter a user at the same time, so that the purposes of laying one cable and realizing at least two functions are realized; in the application, the circular arc parts of all the filling parts are on the same cylindrical surface, so that the product structure is round and smooth; in this application, each subunit may actually be used as a sub-optical cable.

In this application, have the optical fiber area in the well, further increased the capacity of optical communication, simultaneously for butterfly-shaped optical cable and many optical fiber area co-cable have realized high-capacity, high density optical transmission.

The application has the following main beneficial technical effects: the number of the introducing units is more, the adaptation and the matching performance of the introducing units and the optical interfaces of the optical equipment are better, the space utilization rate is higher, and photoelectric signals can be transmitted simultaneously.

The above-described embodiments are only preferred embodiments of the present utility model, and should not be construed as limiting the present utility model. The protection scope of the present utility model is defined by the claims, and the protection scope includes equivalent alternatives to the technical features of the claims. I.e., equivalent replacement modifications within the scope of this utility model are also within the scope of the utility model.

Claims (10)

1. A butterfly-shaped lead-in optical cable with a plurality of lead-in units is provided with a cable core, a protective layer (6) and an outer sheath (7), wherein the protective layer covers the cable core; the method is characterized in that: the cable core consists of an optical fiber ribbon (1), four subunits and four filling components (5); each subunit consists of a unit shell (3), two first type introducing units (2) and a second type introducing unit (4), wherein the first type introducing units are positioned on two sides of the second type introducing unit; the outer edge of the cross section of the unit shell is regular octagon; each filling part (5) is composed of a filling body and an insulated wire positioned inside the filling body; the four unit shells are spliced to form a central hole (10) with a square cross section, an outer cavity (60) is formed outside the spliced part of the adjacent unit shells, and the filling component is positioned in the outer cavity; the optical fiber ribbon (1) is positioned in the central hole; the material of the unit shell (3) is plastic or steel or iron or aluminum or copper or aluminum alloy or copper alloy; the material of the outer sheath (7) is plastic.

2. A butterfly drop cable having a plurality of drop units according to claim 1 wherein: the unit shell (3) is composed of a first outer side wall body (31), a second outer side wall body (32), a third outer side wall body (33), a fourth outer side wall body (34), a fifth outer side wall body (35), a sixth outer side wall body (36), a seventh outer side wall body (37), an eighth outer side wall body (38), a first inner side wall body (311), a second inner side wall body (313), a third inner side wall body (331), a fourth inner side wall body (371), a fifth inner side wall body (357) and a sixth inner side wall body (351), the unit shell is of an integrated structure, the head end and the tail end of the first outer side wall body to the tail end of the eighth outer side wall body are sequentially connected, and the outer edge of the cross section of the unit shell is in a regular octagon shape; one end of the first inner side wall body (311) is connected to the center of the inner edge of the first outer side wall body (31), the other end of the first inner side wall body (311) is connected with one end of the second inner side wall body (313), the other end of the second inner side wall body (313) is connected with the other end of the third inner side wall body (331), one end of the third inner side wall body (331) is connected to the center of the inner edge of the third outer side wall body (33), the first inner side wall body (311) is parallel to the third outer side wall body (33), the second inner side wall body (313) is parallel to the second outer side wall body (32), and the third inner side wall body (331) is parallel to the third inner side wall body (331); one end of the fourth inner side wall body (371) is connected to the center of the inner edge of the seventh outer side wall body (37), the other end of the fourth inner side wall body (371) is connected with one end of the fifth inner side wall body (357), the other end of the fifth inner side wall body (357) is connected with the other end of the sixth inner side wall body (351), one end of the sixth inner side wall body (351) is connected to the center of the inner edge of the fifth outer side wall body (35), the fourth inner side wall body (371) is parallel to the fifth outer side wall body (35), the fifth inner side wall body (357) is parallel to the sixth outer side wall body (36), and the sixth inner side wall body (351) is parallel to the seventh outer side wall body (37); the first outer side wall body (31), the second outer side wall body (32), the third outer side wall body (33), the third inner side wall body (331), the second inner side wall body (313) and the first inner side wall body (311) enclose a first accommodating cavity (301); the fifth outer side wall body (35), the sixth outer side wall body (36), the seventh outer side wall body (37), the fourth inner side wall body (371), the fifth inner side wall body (357) and the sixth inner side wall body (351) enclose a second accommodating cavity (302); the first outer side wall body (31), the first inner side wall body (311), the second inner side wall body (313), the third inner side wall body (331), the third outer side wall body (33), the fourth outer side wall body (34), the fifth outer side wall body (35), the sixth inner side wall body (351), the fifth inner side wall body (357), the fourth inner side wall body (371), the seventh outer side wall body (37) and the eighth outer side wall body (38) are enclosed to form a large accommodating cavity; the first outer side wall body (31), the first inner side wall body (311), the fourth inner side wall body (371), the seventh outer side wall body (37) and the eighth outer side wall body (38) enclose a third accommodating cavity (303); the second inner side wall body (313) and the fifth inner side wall body (357) enclose a fifth accommodating cavity (305); the third inner side wall body (331), the third outer side wall body (33), the fourth outer side wall body (34), the fifth outer side wall body (35) and the sixth inner side wall body (351) enclose a fourth accommodating cavity (304); the large accommodating cavity is composed of a third accommodating cavity (303), a fifth accommodating cavity (305) and a fourth accommodating cavity (304), the fifth accommodating cavity (305) is communicated with the third accommodating cavity (303), and the fifth accommodating cavity (305) is communicated with the fourth accommodating cavity (304).

3. A butterfly drop cable having a plurality of drop units according to claim 2 wherein: the first type of introducing unit (2) is composed of an introducing sheath (21), an optical fiber (22) and two reinforcing pieces (23), the cross section of the introducing sheath is a hexagon with opposite sides parallel, the distance between a group of parallel sides with the smallest distance is called the width of the first type of introducing unit, the length between two peaks with the largest distance is called the height of the first type of introducing unit, the introducing sheath integrally covers the optical fiber (22) and the reinforcing pieces (23), the optical fiber is positioned in the center of the introducing sheath, the two reinforcing pieces and the optical fiber are distributed along the height direction of the first type of introducing unit, the two reinforcing pieces are respectively positioned at two sides of the optical fiber, and a concave tearing port (24) is formed in the introducing sheath which passes through the center of the optical fiber and is perpendicular to the height of the first type of introducing unit; the first type of introduction unit (2) is located in the first accommodation chamber (301) and the second accommodation chamber (302).

4. A butterfly drop cable having a plurality of drop units according to claim 3 wherein: the second type of introducing unit (4) is formed by protecting the body, two reinforcement (44), optical fiber tape, the optical fiber tape is formed by a plurality of optical fibers (45) that are arranged in rows and are not contacted between adjacent ones, the tie coat (46) wrapping all optical fibers, protecting the body of protecting the cover is formed by first protecting cover (41), second protecting cover (42), third protecting cover (43), the third protecting cover is located between first protecting cover and second protecting cover and links with first protecting cover, second protecting cover as an organic whole, two reinforcement lie in first protecting cover and second protecting cover separately, the optical fiber tape is located in the third protecting cover; the second type of introduction unit (4) is located in the large receiving chamber.

5. A butterfly drop cable having a plurality of drop units according to claim 1 wherein: the unit housing (3) is of symmetrical construction.

6. A butterfly drop cable having a plurality of drop units according to claim 1 wherein: the filling member (5) is of symmetrical construction.

7. A butterfly drop cable having a plurality of drop units according to claim 1 wherein: the first type of introduction unit (2) and the second type of introduction unit (4) are each of symmetrical construction.

8. A butterfly drop cable having a plurality of drop units according to claim 1 wherein: the material of the protective layer (6) is polyester tape or polyester binding yarn or water blocking tape or non-woven fabric or steel belt or aluminum belt.

9. A butterfly drop cable having a plurality of drop units according to claim 1 wherein: the material filling the body is plastic.

10. A butterfly drop cable having a plurality of drop units according to claim 1 wherein: the first introduction unit (2) has a nominal height of 2mm and a nominal width of 1.6mm; the second introduction unit (4) has a nominal height of 3mm and a nominal width of 2mm.