阅读说明：本技术 一种对称并行扁平引入光缆 (Symmetrical parallel flat leading-in optical cable ) 是由 韩庆涛 李为 谢松华 王首佳 张得怀 陈健 徐钰凯 张海潮 苏荣 于 2018-08-26 设计创作，主要内容包括：本发明属于通信光缆技术领域,涉及一种对称并行扁平引入光缆。两个相同并且互相平行设置的独立光纤单元都由2条光纤置于松套管内并填充纤膏组成,2条非金属加强件都与光纤单元平行并互相对称分别置于光纤单元左右两侧,扁平的护套将光纤单元和非金属加强件一起包覆,本发明最主要的特点是,在护套内的中心位置设置减压气室,将光缆包含的两个光纤单元隔开,减压气室既减小了护套料对松套管的挤压力,又在施工时便于两个光纤单元分离。本发明光纤在纤膏的作用下微弯产生余长,保护光纤不易产生损耗；阻燃效果好,对人体危害小；包含两个独立光纤单元,光缆耗材减少,节约成本；适用于写字楼、居民小区和机房,更高效的服务于信号的传输。(The invention belongs to the technical field of communication optical cables, and relates to a symmetrical parallel flat leading-in optical cable. The optical cable is characterized in that a decompression air chamber is arranged at the central position in the sheath, the two optical fiber units contained in the optical cable are separated, and the decompression air chamber not only reduces the extrusion force of sheath materials on the loose tube, but also facilitates the separation of the two optical fiber units during construction. The optical fiber is slightly bent under the action of the fiber paste to generate extra length, so that the optical fiber is protected from being easily lost; the flame retardant effect is good, and the harm to human bodies is small; the optical cable comprises two independent optical fiber units, so that the optical cable material consumption is reduced, and the cost is saved; the method is suitable for office buildings, residential areas and machine rooms, and can be used for transmitting signals more efficiently.)

1. A symmetrical parallel flat leading-in optical cable is characterized in that two identical optical fiber units I and II are arranged in parallel, the optical fiber unit I is arranged on the left side, the optical fiber unit II is arranged on the right side, the optical fiber unit I and the optical fiber unit II are both arranged in a loose tube (3) through 2 optical fibers (1), the loose tube (3) is filled with fiber paste (2) to form, 2 nonmetal reinforcing pieces (4) are arranged on the left side of the optical fiber unit I and the right side of the optical fiber unit II in parallel with the optical fiber unit respectively, the 2 nonmetal reinforcing pieces are arranged in symmetry with each other, a flat sheath (5) covers the optical fiber unit I, the optical fiber unit II and the 2 nonmetal reinforcing pieces (4) together, the outer surface of the sheath (5) is composed of an upper plane, a lower plane, a left side face and a right side face, the upper plane and the lower plane of the sheath (5) are parallel with each other and are symmetrical, the left surface and the right surface of sheath (5) are the semicylinder of symmetry each other, and the generating line of the cylinder of left surface and the generating line of the cylinder of right surface are parallel to each other, center department in the last plane of sheath (5) has a fore-and-aft V-arrangement groove (6), center department between sheath (5) inside optical fiber unit I and optical fiber unit II has a fore-and-aft rectangular cross section's decompression air chamber (7), the long limit in the left side of the rectangular cross section of decompression air chamber (7) is adjacent with optical fiber unit I, the long limit in the right side of the rectangular cross section of decompression air chamber (7) is adjacent with optical fiber unit II, the center of the short side of the rectangular cross section of decompression air chamber (7) is aimed at to V-arrangement groove (.

2. Symmetrical parallel flat drop cable according to claim 1, characterized in that the optical fiber (1) is a single-mode bend-resistant fiber.

3. Symmetrical parallel flat drop cable according to claim 1, characterized in that the fiber paste (2) is a water-blocking fiber paste.

4. A symmetric parallel flat drop cable according to claim 1, characterized in that the material of the loose tube (3) is a polybutylene terephthalate material.

5. Symmetrical parallel flat drop cable according to claim 1, characterized in that the material of the non-metallic strength member (4) is an aramid reinforced plastic rod or a fiber reinforced composite material.

6. A symmetric parallel flat drop cable according to claim 1, characterized in that the material of the jacket (5) is a low smoke zero halogen flame retardant polyolefin jacket material.

Technical Field

The invention belongs to the technical field of communication optical cables, and particularly relates to a symmetrical parallel flat leading-in optical cable.

Background

In recent years, the construction and deployment of FTTH (fiber to the home) are greatly promoted by each operator according to national broadband coverage planning, butterfly-shaped lead-in optical cables are widely used in a home segment, and the further development of a broadcast television network is promoted by the three-network integration of a telecommunication network, a broadcast television network and the internet. Due to the emergence of new services such as high-definition televisions, high-definition interactive on-demand, high-speed internet surfing, video conferences, smart homes, cloud storage, cloud application, cloud service and the like, more broadband and more stable network support are needed, and the problems of repeated construction, increased construction difficulty and the like are caused by the fact that the traditional butterfly-shaped leading-in optical cable is used. Therefore, it is necessary to develop an optical drop cable that meets more structural requirements and performance requirements, and to improve the reliability and applicability of the subscriber optical drop cable. In such a background, there is a need for a symmetrical parallel low loss drop cable to address and ameliorate these problems.

Disclosure of Invention

In order to solve the problems described in the background art, the invention provides a symmetrical parallel flat drop cable, two identical optical fiber units I and II are arranged in parallel, the optical fiber units I are arranged on the left side, the optical fiber units II are arranged on the right side, the optical fiber units I and II are both composed of 2 optical fibers 1 arranged in a loose tube 3, the loose tube 3 is filled with fiber paste 2, 2 nonmetal reinforcing members 4 are arranged on the left side of the optical fiber units I and the right side of the optical fiber units II in parallel with the optical fiber units respectively, and the 2 nonmetal reinforcing members are arranged symmetrically with each other, a flat sheath 5 covers the optical fiber units I, the optical fiber units II and the 2 nonmetal reinforcing members 4 together, the outer surface of the sheath 5 is composed of an upper plane, a lower plane, a left side surface and a right side surface, the upper plane and the lower plane of the sheath 5 are parallel with each other and are symmetrical with each other, the left side surface and the right side surface of the sheath 5 are, a generatrix of the left side surface cylinder is parallel to a generatrix of the right side surface cylinder, a longitudinal V-shaped groove 6 is arranged at the center of the upper plane of the sheath 5, a longitudinal decompression air chamber 7 with a rectangular cross section is arranged at the center between the optical fiber unit I and the optical fiber unit II in the sheath 5, the left long side of the rectangular cross section of the decompression air chamber 7 is adjacent to the optical fiber unit I, the right long side of the rectangular cross section of the decompression air chamber 7 is adjacent to the optical fiber unit II, and the V-shaped groove 6 is aligned to the center of the short side of the rectangular cross section of the decompression air chamber 7;

the V-shaped groove 6 on the sheath 5 only plays a role in positioning a central line, so that the accurate division position can be found when the optical fiber unit I and the optical fiber unit II need to be separated conveniently in construction, and the pressure reduction air chamber 7 in the sheath 5 has two functions, namely, the extrusion force of a sheath material on the loose tube 3 can be reduced, and the optical fiber unit I and the optical fiber unit II can be separated conveniently in construction, so long as the sheath thin layer at the top of the pressure reduction air chamber is cut from the V-shaped groove 6, and then the sheath thin layer at the bottom of the pressure reduction air chamber 7 is cut, so that the separation of the optical fiber unit;

the optical fiber 1 is a single-mode bending-resistant optical fiber;

the fiber paste 2 is a water-blocking fiber paste, plays roles in sealing, water proofing and stress resistance buffering, and is a key material for protecting optical fibers;

the loose tube 3 is made of polybutylene terephthalate (PBT);

the non-metal reinforcing piece 4 is made of aramid fiber reinforced plastic rods (KFRP) or fiber reinforced composite materials (FRP);

the sheath 5 is made of low-smoke halogen-free flame-retardant polyolefin sheath material;

the optical cable is mainly characterized in that a pressure reduction air chamber is arranged at the central position in a sheath, two independent and parallel optical fiber units I and two independent and parallel optical fiber units II contained in the optical cable are separated, the pressure reduction air chamber in the sheath has two functions, firstly, the extrusion force of sheath materials on a loose tube 3 can be reduced, the quality of optical communication is improved, secondly, the separation of the optical fiber units I and the optical fiber units II is facilitated during construction, and the separation of the optical fiber units I and the optical fiber units II can be realized only by cutting a sheath thin layer at the top of the pressure reduction air chamber from a V-shaped groove and then cutting a sheath thin layer at the bottom of the pressure reduction air chamber 7;

the invention has the following other characteristics:

the V-shaped groove on the sheath only has the function of central line positioning, and the depth is small, so that the defects that the V-shaped groove of the conventional butterfly-shaped optical cable is deep and easy to corrode and accumulate ova and the like in the groove are overcome;

when the optical fiber unit I and the optical fiber unit II need to be separated in construction, an accurate segmentation position can be found only from the V-shaped groove;

the optical fiber is slightly bent under the action of the fiber paste to generate extra length, so that the protection effect on the optical fiber is good, and the optical fiber is not easy to generate loss;

the optical cable comprises two independent optical fiber units, so that the optical cable consumes less material, saves cost, is constructed in place at one time, reduces construction cost, is easy to branch during construction, and the branch length is automatically adjusted according to the requirement of a construction site;

the prefabricated end is manufactured and welded by using the traditional hot melting process, and the process is the same as that of the traditional butterfly-shaped leading-in optical cable;

the sheath is made of low-smoke halogen-free sheath materials, so that the flame retardant effect is good, fire hazards can be prevented from spreading along the optical cable, halogen is not released when the optical cable is roasted, and the optical cable is low in smoke and small in harm to human bodies.

The invention has the beneficial effects that: the center of the sheath is provided with the pressure reduction air chamber, so that the extrusion force of sheath materials on the loose tube is reduced, the communication quality is improved, and the optical fiber unit I and the optical fiber unit II are conveniently separated during construction; the optical fiber is slightly bent under the action of the fiber paste to generate extra length, so that the protection effect on the optical fiber is good, and the optical fiber is not easy to generate loss; the branch length is automatically adjusted during construction, and the traditional hot melting process can be used for welding; the flame retardant effect is good, and is little to the human body harm, and the optical cable contains two independent fiber unit, and the optical cable consumptive material reduces, practices thrift the cost.

Drawings

FIG. 1 is a cross-sectional schematic view of a symmetric parallel flat drop cable.

In the figure, 1 is an optical fiber, 2 is a fiber paste, 3 is a loose tube, 4 is a non-metal reinforcing part, 5 is a sheath, 6 is a V-shaped groove, and 7 is a decompression air chamber.

Detailed Description

The invention is further illustrated below with reference to examples and figures.

This embodiment is a symmetrical parallel flat drop cable and fig. 1 is a cross-sectional view of a symmetrical parallel flat drop cable. The optical fiber unit I and the optical fiber unit II are arranged in parallel, the optical fiber unit I is arranged on the left side, the optical fiber unit II is arranged on the right side, the optical fiber unit I and the optical fiber unit II are both formed by placing 2 optical fibers 1 in a loose tube 3, and the loose tube 3 is filled with fiber paste 2; 2 nonmetal reinforcing pieces 4 are parallel to the optical fiber unit and are respectively arranged on the left side of the optical fiber unit I and the right side of the optical fiber unit II, and the 2 nonmetal reinforcing pieces are symmetrically arranged; the optical fiber unit I, the optical fiber unit II and 2 non-metallic reinforcing members 4 are coated together by a flat sheath 5. The outer surface of the sheath 5 is composed of an upper plane, a lower plane, a left side surface and a right side surface, the upper plane and the lower plane of the sheath 5 are parallel to each other and are symmetrical to each other, the left side surface and the right side surface of the sheath 5 are semi-cylindrical surfaces which are symmetrical to each other, and a bus of a cylinder of the left side surface is parallel to a bus of a cylinder of the right side surface. A longitudinal V-shaped groove 6 is formed in the center of the upper plane of the sheath 5, a longitudinal pressure reduction air chamber 7 with a rectangular cross section is formed in the center between the optical fiber unit I and the optical fiber unit II inside the sheath 5, the long side of the left side of the rectangular cross section of the pressure reduction air chamber 7 is adjacent to the optical fiber unit I, the long side of the right side of the rectangular cross section of the pressure reduction air chamber 7 is adjacent to the optical fiber unit II, and the V-shaped groove 6 is aligned with the center of the short side of the rectangular cross section of the pressure reduction air chamber 7.

V-arrangement groove 6 on sheath 5 only plays the central line location effect, find accurate segmentation position when convenient construction needs separation optical fiber unit I and optical fiber unit II, decompression air chamber 7 in the sheath 5 has two effects, firstly can reduce the extrusion force of sheath material to loose tube 3, improve communication quality, secondly be convenient for separate the separation of optical fiber unit I and optical fiber unit II when the construction, as long as cut the sheath thin layer at decompression air chamber top from V-arrangement groove 6, cut the sheath thin layer of decompression air chamber 7 bottom again, realize the separation of optical fiber unit I and optical fiber unit II promptly.

The single-mode bend-resistant fiber of the optical fiber 1 is a bend-insensitive single-mode fiber (g.657a2); the water-blocking fiber paste of the fiber paste 2 is hydrogen-absorbing fiber paste, plays roles of sealing, water proofing and stress resistance buffering, and is a key material for protecting optical fibers; the loose tube 3 is made of polybutylene terephthalate (PBT), is flame-retardant and high-temperature resistant, and has a protection effect on optical fibers; the non-metal reinforcing piece 4 is made of aramid fiber reinforced plastic rods (KFRP) or fiber reinforced composite materials (FRP); the jacket 5 is made of low-smoke halogen-free flame-retardant polyolefin jacket material.

The structural dimensions of each part of the symmetrical parallel flat leading-in optical cable are as follows:

the outer diameter of the loose tube 3 is 1.4 mm plus or minus 0.05mm, and the wall thickness is 0.35 mm plus or minus 0.03 mm;

the outer diameter of the reinforcing part 4 is 0.58 mm plus or minus 0.05 mm;

the distance between the loose tube 3 and the reinforcing piece 4 is 0.2 +/-0.03 mm;

the width of the cross section of the sheath 5 is 6.2 plus or minus 0.1mm, and the height is 2.4 plus or minus 0.1 mm;

the width of the decompression air chamber 7 is 0.3 plus or minus 0.03mm, and the height is 1.5 plus or minus 0.05 mm;

the distance between the top surface of the pressure reducing air chamber 7 and the bottom of the V-shaped groove 6 is 0.3 +/-0.03 mm, and the distance between the bottom surface of the pressure reducing air chamber 7 and the lower plane of the sheath 5 is 0.3 +/-0.03 mm;

the distance between the side wall of the decompression air chamber 7 and the adjacent loose tube 3 is 0.32 +/-0.03 mm.

The invention is suitable for office buildings, residential areas and machine rooms, and more efficiently serves for signal transmission.