CN115954154B

CN115954154B - Combined type convenient and fast low-voltage cable

Info

Publication number: CN115954154B
Application number: CN202310244051.8A
Authority: CN
Inventors: 王雪; 宁蒙蒙; 宁依凡; 宁小六; 赵青联; 刘方
Original assignee: Aerospace Cable Co ltd
Current assignee: Aerospace Cable Co ltd
Priority date: 2023-03-15
Filing date: 2023-03-15
Publication date: 2023-05-05
Anticipated expiration: 2043-03-15
Also published as: CN115954154A

Abstract

The invention discloses a combined type convenient low-voltage cable, which relates to the technical field of cables and comprises a cable inner core and an optical fiber inner core, wherein a middle protection structure is wrapped outside the cable inner core, an outer protection structure is wrapped outside the middle protection structure, and the optical fiber inner core penetrates into the middle part of the middle protection structure.

Description

Combined type convenient and fast low-voltage cable

Technical Field

The invention relates to the technical field of cables, in particular to a composite convenient low-voltage cable.

Background

The cable is a conductor coated with an insulating layer, a protective layer, a shielding layer and the like for transmitting electric power or signal current and signal voltage, can be divided into a high-voltage cable and a low-voltage cable according to voltage, and is relatively difficult to lay and maintain compared with a low-voltage overhead line and a low-voltage overhead insulating line, but has the characteristics of reliable operation, no standing pole, no occupied area, no interference on look, relatively small influence from the outside and the like, so that the cable is widely applied in a low-voltage distribution system, and as communication needs, people add optical fiber cores in the cable, and combine a common cable and optical fibers to form a composite cable;

but the compound low-voltage cable in the current market can't be quick outwards dispel the inside heat, and the inside temperature degree of accuracy through measuring outside temperature estimation is low, and expend with heat and contract with cold can directly influence inner structure, causes the cable to damage.

Disclosure of Invention

The invention provides a composite convenient low-voltage cable, which can effectively solve the problems that the composite low-voltage cable in the market at present cannot quickly dissipate internal heat outwards, the accuracy of the internal temperature estimated by measuring the external temperature is low, the internal structure is directly influenced by expansion with heat and contraction with cold, and the cable is damaged.

In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides a convenient low tension cable of combined type, includes cable inner core and optic fibre inner core, the outside parcel of cable inner core has middle part protective structure, middle part protective structure's outside parcel has outer protective structure, the optic fibre inner core has been penetrated at middle part protective structure middle part, optic fibre inner core outside parcel has optic fibre protective structure;

the middle protection structure comprises a positioning tube;

the cable comprises a cable core, an optical fiber core, a positioning pipe, a telescopic groove, a heat dissipation silica gel piece and an annular heat dissipation silica gel piece, wherein the outer parts of the cable core and the optical fiber core are wrapped with the positioning pipe, the positioning pipe is internally provided with the positioning pipe groove, the inner side of the positioning pipe groove is provided with the telescopic groove, the middle part of the positioning pipe groove is equidistantly provided with the heat dissipation groove, the heat dissipation silica gel piece is placed in the heat dissipation groove, and one end of the heat dissipation silica gel piece is connected with the annular heat dissipation silica gel;

the outside cover of positioning tube is equipped with the protection pipe, the buffer tank has been seted up on the pipe wall of protection pipe, the outside cover of protection pipe is equipped with the fixed pipe, the outside of fixed pipe is connected with the elastic sheet, the inboard equidistance of elastic sheet is filled there is insulating filler.

According to the technical scheme, the reserved grooves are formed between the adjacent insulating fillers, the fixing holes are formed in the middle parts of the protection pipe, the fixing pipe and the elastic piece, which correspond to the positions of the reserved grooves, and the notch grooves are formed in the middle parts of the positioning pipe, the protection pipe and the fixing pipe.

According to the technical scheme, the positioning tube is provided with four placing tube grooves, an optical fiber inner core penetrates into one placing tube groove, and a cable inner core penetrates into the rest placing tube grooves;

the heat dissipation grooves are positioned among the four placing pipe grooves, and the positions, corresponding to the telescopic grooves, of the middle parts of the heat dissipation grooves are curved;

the notch grooves are positioned at two end positions of the reserved groove.

According to the technical scheme, the outer protection structure comprises a wrapping pipe;

the outside parcel of elastic sheet has the parcel pipe, the embedded groove has been seted up to the outside of parcel pipe, the outside cover of parcel pipe is equipped with the wear-resisting pipe, the filling groove has been seted up in the outside of wear-resisting pipe, the outside of wear-resisting pipe corresponds filling groove position department and installs the spiral pipe, it has wear-resisting filler to fill between filling groove and the spiral pipe.

According to the technical scheme, the edge of the elastic sheet is connected with the inner side of the wrapping pipe, and the insulating filler is filled between the elastic sheet and the wrapping pipe.

According to the technical scheme, the filling groove extends spirally, and longitudinal sections of the spiral pipe and the filling groove are of semicircular structures;

the spiral pipe protrudes out of the wear-resistant pipe.

According to the technical scheme, one end of the radiating silica gel sheet is arranged in the fixing hole, and the annular radiating silica gel is sleeved in the embedded groove.

According to the technical scheme, the optical fiber protection structure comprises an inner cladding tube;

the outside parcel of optic fibre inner core has interior package pipe, the outside parcel of interior package pipe has the stay tube, the fixed strip is all installed in inboard and the outside of stay tube, the outside parcel of stay tube has the outsourcing pipe, the outside parcel of outsourcing pipe has the buffer tube, the pipe wall embedding of buffer tube has extrusion tubule, oval lumen has been seted up at the middle part of extrusion tubule, be connected to be formed with the triangle cavity between stay tube, fixed strip and the outsourcing pipe, the inside packing of triangle cavity has fire prevention filler.

According to the technical scheme, the supporting tube is a hexagonal tube, and the supporting tube and the fixing strip are of an integrated structure;

the fixing strip positioned at the outer side of the supporting tube is connected with the outer wrapping tube, and the fixing strip positioned at the inner side of the supporting tube is connected with the inner wrapping tube.

According to the technical scheme, the extrusion tubule is provided with a plurality of, the outside of the extrusion tubule is connected with the outer wrapping pipe, and the ellipse lumen corresponds elliptical major axis extension line and crosses the center of the buffer tube corresponding circle.

Compared with the prior art, the invention has the beneficial effects that:

through setting up the registration arm, place the tube chute, the expansion tank, the radiating groove, radiating silica gel piece and annular radiating silica gel, the inside heat that produces of cable is through radiating silica gel piece to annular radiating silica gel position transmission, thereby the heat that produces the cable is inside dispels the heat to cable outside transmission, and be provided with the reservation groove at annular radiating silica gel, people are when monitoring cable temperature, find the sunken reservation groove position of extrusion through extrusion cable outside, carry out temperature monitoring in this position, can monitor the temperature that is close the inner core more, and set up the incision groove at reservation groove both ends portion, increase the heat dissipation space, and when needing to carry out cable connection, it is more convenient to strip the line in incision groove position department, and make radiating silica gel piece and annular radiating silica gel arrange cable junction in, the radiating effect of interface department has been increased.

Through setting up the protective tube of locating tube, expansion tank, crooked form's heat dissipation groove and seting up the dashpot, when the cable is heated, can stretch in expansion tank and dashpot position, when the temperature is lower, can shrink in expansion tank and dashpot position, satisfy the expend with heat and contract with cold demand of cable, be difficult for expend with heat and contract with cold to damage the cable.

3. Through setting up parcel pipe, embedded groove, wear-resisting pipe, filling groove, spiral pipe and wear-resisting filler, set up wear-resisting pipe in the cable outside, the cable is easily worn and torn when laying and installing, when wearing and tearing, its outside spiral pipe can wear out at first, and after the spiral pipe wearing and tearing, whole wear-resisting pipe still can keep intact, through setting up convex spiral pipe to the sacrificial spiral pipe protects the cable, and not only the consumptive material is few, and the spiral pipe can be with the cable support, reduces the area of cable outside and other object contact wearing and tearing.

4. Through setting up interior package pipe, stay tube, fixed strip, outer package pipe, buffer tube, extrusion tubule and oval lumen, when the outside of optic fibre inner core receives the extrusion, can extrude the oval lumen of extrusion tubule, buffer the extrusion, then extrude to the stay tube again, stay tube and fixed strip disperse outside extrusion to both sides to can not direct extrusion optic fibre inner core, stay tube and fixed strip have increased the outside intensity of optic fibre inner core, protect the optic fibre inner core, ensured the transmission effect of optic fibre inner core.

The outer protection structure protects the optical fiber protection structure outside the optical fiber protection structure, and the optical fiber protection structure protects the optical fiber inner core outside the optical fiber inner core, so that the optical fiber inner core is doubly protected, extrusion influence is reduced, and optical fiber performance is guaranteed.

To sum up, satisfy expend with heat and contract with cold demand through setting up expansion tank, buffer tank, set up the heat dissipation silica gel piece in the heat dissipation groove, and connect annular heat dissipation silica gel, increase the inside outside heat dissipation of cable, set up the reservation groove, lead to pressing to find the reservation groove, conveniently carry out temperature monitoring, through the incision groove at reservation groove both ends, conveniently peel off the cable wiring, wearing and tearing outside convex spiral pipe, reach the effect of protection cable, and set up the extrusion tubule of oval lumen outside the optic fibre inner core and cushion the extrusion, stay tube and fixed strip disperse the extrusion, reduce the extrusion to the optic fibre inner core, the transmission of guarantee optic fibre inner core is unobstructed.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention.

In the drawings:

FIG. 1 is a schematic plan view of the present invention;

FIG. 2 is a cross-sectional view of a positioning tube of the present invention;

FIG. 3 is a schematic view of the mounting structure of the heat dissipating silicone sheet of the present invention;

FIG. 4 is an internal structural view of the positioning tube of the present invention;

FIG. 5 is a schematic view of an installation of the annular heat dissipating silica gel of the present invention;

FIG. 6 is a schematic view of the structure of the annular heat dissipating silica gel of the present invention;

FIG. 7 is a schematic view of the structure of the spiral tube of the present invention;

FIG. 8 is a cross-sectional view of a wrap-tube of the present invention;

FIG. 9 is a schematic illustration of the installation of the optical fiber core of the present invention;

FIG. 10 is a schematic view of the structure of the fixing strip of the present invention;

FIG. 11 is a schematic view of the structure of the support tube of the present invention;

FIG. 12 is a schematic view of the structure of an oval lumen of the present invention;

reference numerals in the drawings: 1. a cable core;

2. a middle protective structure; 201. a positioning tube; 202. placing a pipe groove; 203. a telescopic slot; 204. a heat sink; 205. a heat-dissipating silica gel sheet; 206. annular heat dissipation silica gel; 207. a protective tube; 208. a buffer tank; 209. a fixed tube; 210. an elastic sheet; 211. an insulating filler; 212. a reserved groove; 213. a fixing hole; 214. a slit groove;

3. an outer protective structure; 301. a wrapping tube; 302. an embedding groove; 303. a wear resistant tube; 304. filling the groove; 305. a spiral tube; 306. wear-resistant filler;

4. an optical fiber inner core;

5. an optical fiber protection structure; 501. an inner wrapping pipe; 502. a support tube; 503. a fixing strip; 504. a sheath tube; 505. a buffer tube; 506. extruding the tubule; 507. an elliptical lumen; 508. a triangular chamber; 509. and (3) fireproof filler.

Detailed Description

The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.

Examples:

as shown in fig. 1-6, the invention provides a technical scheme, a composite convenient low-voltage cable, which comprises a cable inner core 1 and an optical fiber inner core 4, wherein the outer part of the cable inner core 1 is wrapped with a middle protection structure 2, the outer part of the middle protection structure 2 is wrapped with an outer protection structure 3, the middle part of the middle protection structure 2 is penetrated with the optical fiber inner cores 4, the optical fiber inner cores 4 are a plurality of composite optical fiber, and the outer part of the optical fiber inner cores 4 is wrapped with an optical fiber protection structure 5;

the middle protective structure 2 comprises a positioning tube 201, a placing tube groove 202, a telescopic groove 203, a heat dissipation groove 204, a heat dissipation silica gel piece 205, an annular heat dissipation silica gel 206, a protective tube 207, a buffer groove 208, a fixing tube 209, an elastic piece 210, an insulating filler 211, a reserved groove 212, a fixing hole 213 and a notch groove 214;

the outside parcel of cable inner core 1 and optic fibre inner core 4 has registration arm 201, the registration arm 201 inside has seted up the registration arm 202, the registration arm 201 is provided with four registration arm 202, the inside optic fibre inner core 4 that has penetrated of registration arm 202, the inside cable inner core 1 that has penetrated of remaining registration arm 202, make things convenient for the installation of cable inner core 1 and optic fibre inner core 4, the expansion tank 203 has been seted up to the inboard of registration arm 202, the radiating groove 204 has been seted up to the middle part equidistance of registration arm 202, the inside of radiating groove 204 has placed radiating silica gel 205, the one end of radiating silica gel 205 is connected with annular radiating silica gel 206, the outside cover of registration arm 201 is equipped with protective tube 207, the buffer tank 208 has been seted up on the pipe wall of protective tube 207, the outside cover of protective tube 207 is equipped with fixed pipe 209, the outside of fixed pipe 209 is connected with the flexure strip 210, the inboard equidistance of flexure strip 210 has filled insulating filler 211, be the polyethylene insulating filler 211, be provided with reservation groove 212 between the adjacent insulating filler 211, the protective tube 207, fixed pipe 209 and flexure strip 210 middle part correspond reservation groove 212 position department has all been seted up fixed orifices 213, the retaining tube 201, protective tube 207 and protection tube 207 and flexure strip 210 middle part correspond reservation groove 212 position department, the one end of reservation groove 212 has been seted up at reservation groove 212 position, the convenient for the reservation groove position of reservation groove 212.

According to the above technical solution, the heat dissipation groove 204 is located between the four placement tube grooves 202, and the middle portion of the heat dissipation groove 204 is curved at the position corresponding to the expansion groove 203.

As shown in fig. 7 to 8, according to the above technical solution, the outer protection structure 3 comprises a wrapping tube 301, an embedded groove 302, a wear-resistant tube 303, a filling groove 304, a spiral tube 305 and a wear-resistant filler 306;

the outside parcel of elastic sheet 210 has parcel pipe 301, the elastic sheet 210 limit portion is connected with parcel pipe 301 inboard, insulating filler 211 fills between elastic sheet 210 and parcel pipe 301, make things convenient for the installation of elastic sheet 210, the embedded groove 302 has been seted up in the outside of parcel pipe 301, the fixed orifices 213 is arranged in to radiating silica gel 205 tip, annular radiating silica gel 206 cover is located in the embedded groove 302, make things convenient for the installation of annular radiating silica gel 206, the outside cover of parcel pipe 301 is equipped with wear-resisting pipe 303, filling groove 304 has been seted up in the outside of wear-resisting pipe 303, the outside of wear-resisting pipe 303 corresponds filling groove 304 position department and installs spiral pipe 305, filling groove 304 is the heliciform extension, the longitudinal section of spiral pipe 305 and filling groove 304 is semi-circular structure, conveniently be connected with filling groove 304, spiral pipe 305 protrusion is outside wear-resisting pipe 303, reduce the area of contact with ground and other objects, protect wear-resisting pipe 303, it has wear-resisting filler 306 to fill between filling groove 304 and the spiral pipe 305, wear-resisting filler 306 is polyurethane.

As shown in fig. 9 to 12, according to the above technical solution, the optical fiber protection structure 5 includes an inner cladding tube 501, a supporting tube 502, a fixing strip 503, an outer cladding tube 504, a buffer tube 505, an extrusion tubule 506, an elliptical lumen 507, a triangular chamber 508, and a fireproof filler 509;

the outside parcel of optic fibre inner core 4 has interior package pipe 501, the outside parcel of interior package pipe 501 has stay tube 502, stay tube 502 inboard and outside all install fixed strip 503, stay tube 502 is the hexagon pipe, stay tube 502 and fixed strip 503 are integrated into one piece structure, increase the compressive property of stay tube 502, the outside parcel of stay tube 502 has outer package pipe 504, be located the fixed strip 503 and the outer package pipe 504 in the stay tube 502 outside and be connected, be located the fixed strip 503 and the interior package pipe 501 of stay tube 502, make things convenient for the fixing of stay tube 502, the outside parcel of outer package pipe 504 has buffer tube 505, the pipe wall embedding of buffer tube 505 has extrusion tubule 506, elliptical lumen 507 has been seted up at the middle part of extrusion tubule 506, extrusion tubule 506 is provided with a plurality of, extrusion tubule 506 outside is connected with outer package pipe 504, elliptical lumen 507 corresponds the long axis extension line of ellipse and crosses the centre of a circle that buffer tube 505 corresponds the circle, conveniently extrude elliptical lumen 507 and cushion the outside extrusion of optic fibre inner core 4, be connected between stay tube 502, the fixed strip 503 and the outer package pipe 504 has triangle cavity 508, the inside is filled with fire prevention filler 509, 509 is glass fiber.

The working principle and the using flow of the invention are as follows: the cable inner core 1 and the optical fiber inner core 4 are arranged in the pipe placing groove 202 of the positioning pipe 201, the inner side of the pipe placing groove 202 is provided with the telescopic groove 203, when the temperature of a cable is too high, the pipe placing groove 202 of the positioning pipe 201 is stretched at the position of the telescopic groove 203, then the buffer groove 208 of the protective pipe 207 is extruded, when the temperature of the cable is low, the positioning pipe 201 is contracted, and the position of the telescopic groove 203 is contracted, so that the inside of the cable can be expanded with heat and contracted with cold, and the cable stretching and contraction damage caused by the temperature is avoided;

when the temperature inside the cable is higher, heat is transferred to the annular heat dissipation silica gel 206 through the heat dissipation silica gel sheet 205 inside the heat dissipation groove 204, so that the heat dissipation is increased, the damage to the cable caused by the overhigh internal temperature is reduced, the position of the reserved groove 212 can be found through the external pressing of the cable, the temperature inside the cable can be monitored more accurately through measuring the temperature of the position, and when wiring is needed, the position of the reserved groove 212 is found through pressing, the cable is stripped at the two ends of the reserved groove 212, the convenience is improved, the heat dissipation silica gel sheet 205 and the annular heat dissipation silica gel 206 can be reserved at the interface position, and the heat dissipation effect of the interface position can be increased;

the convex spiral pipe 305 arranged outside the cable can separate the whole cable from the contacted ground and objects, so that the contact area is reduced, when the cable is worn, the position of the spiral pipe 305 is worn firstly, the wear resistance of the outer part of the cable is increased through the spiral pipe 305 and the inner wear-resistant filler 306, and even if the spiral pipe 305 is worn, the whole wear-resistant pipe 303 can be kept intact without affecting the normal use of the cable, so that the wear resistance of the outer part of the cable is increased, and the service life of the cable is prolonged;

when the cable is extruded, the elliptical tube cavity 507 outside the optical fiber inner core 4 is extruded firstly to buffer extrusion, then the supporting tube 502 and the fixing strip 503 inside the cable are extruded, a plurality of triangular cavities 508 are formed between the supporting tube 502 and the fixing strip 503 in a connecting way, the strength is increased, the supporting tube 502 and the fixing strip 503 disperse extrusion to two sides, the extrusion to the optical fiber inner core 4 is reduced, and the communication effect of the optical fiber inner core 4 is ensured;

in normal use, the outer protection structure 3 protects the optical fiber protection structure outside, and the optical fiber protection structure 5 protects the outer part of the optical fiber inner core, so that the optical fiber inner core is doubly protected, the extrusion influence is reduced, the optical fiber performance is ensured, the normal signal transmission of the composite cable is facilitated, the service life and the transmission efficiency are improved, and the composite cable is suitable for better popularization and use.

Finally, it should be noted that: the foregoing is merely a preferred example of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A combined type convenient low-voltage cable which is characterized in that: the novel optical fiber cable comprises a cable inner core (1) and an optical fiber inner core (4), wherein a middle protection structure (2) is wrapped outside the cable inner core (1), an outer protection structure (3) is wrapped outside the middle protection structure (2), the middle part of the middle protection structure (2) is penetrated with the optical fiber inner core (4), and an optical fiber protection structure (5) is wrapped outside the optical fiber inner core (4);

the middle protection structure (2) comprises a positioning tube (201);

the cable comprises a cable core (1) and an optical fiber core (4), wherein the outside of the cable core (1) and the optical fiber core (4) is wrapped with a positioning pipe (201), a placement pipe groove (202) is formed in the positioning pipe (201), a telescopic groove (203) is formed in the inner side of the placement pipe groove (202), heat dissipation grooves (204) are formed in the middle of the placement pipe groove (202) at equal intervals, a heat dissipation silica gel piece (205) is placed in the heat dissipation grooves (204), and one end of the heat dissipation silica gel piece (205) is connected with annular heat dissipation silica gel (206);

the outside cover of registration arm (201) is equipped with protection pipe (207), buffer tank (208) have been seted up on the pipe wall of protection pipe (207), the outside cover of protection pipe (207) is equipped with fixed pipe (209), the outside of fixed pipe (209) is connected with elastic sheet (210), the inboard equidistance of elastic sheet (210) is filled has insulating filler (211).

2. The composite convenient low-voltage cable according to claim 1, wherein a reserved groove (212) is arranged between adjacent insulating fillers (211), fixing holes (213) are formed in the middle parts of the protective tube (207), the fixing tube (209) and the elastic sheet (210) corresponding to the reserved groove (212), and cut grooves (214) are formed in the middle parts of the positioning tube (201), the protective tube (207) and the fixing tube (209).

3. A composite convenient low-voltage cable according to claim 2, characterized in that the positioning tube (201) is provided with four placement tube slots (202), wherein an optical fiber inner core (4) is penetrated into one placement tube slot (202), and a cable inner core (1) is penetrated into the rest placement tube slots (202);

the heat dissipation grooves (204) are positioned among the four placing pipe grooves (202), and the positions, corresponding to the telescopic grooves (203), of the middle parts of the heat dissipation grooves (204) are curved;

the notch grooves (214) are positioned at two end parts of the reserved groove (212).

4. A composite portable low voltage cable according to claim 2, wherein the outer protective structure (3) comprises a wrapped tube (301);

the outside parcel of elastic sheet (210) has parcel pipe (301), embedded groove (302) have been seted up in the outside of parcel pipe (301), the outside cover of parcel pipe (301) is equipped with wear-resisting pipe (303), filling groove (304) have been seted up in the outside of wear-resisting pipe (303), spiral pipe (305) are installed in the outside of wear-resisting pipe (303) corresponding filling groove (304) position department, fill between filling groove (304) and spiral pipe (305) and have wear-resisting filler (306).

5. The portable low voltage composite cable according to claim 4, wherein the elastic sheet (210) is connected to the inside of the wrapping tube (301) at the edge, and the insulating filler (211) is filled between the elastic sheet (210) and the wrapping tube (301).

6. The portable low voltage composite cable according to claim 4, wherein the filling groove (304) extends in a spiral shape, and the longitudinal sections of the spiral tube (305) and the filling groove (304) are both in a semicircular structure;

the spiral tube (305) protrudes outside the abrasion-resistant tube (303).

7. The composite portable low voltage cable according to claim 4, wherein one end of the heat dissipation silica gel sheet (205) is disposed in the fixing hole (213), and the annular heat dissipation silica gel sheet (206) is sleeved in the embedded groove (302).

8. A composite portable low voltage cable according to claim 1, wherein the optical fiber protection structure (5) comprises an inner sheath tube (501);

the outside parcel of optic fibre inner core (4) has interior package pipe (501), the outside parcel of interior package pipe (501) has stay tube (502), fixed strip (503) are all installed to the inboard and the outside of stay tube (502), the outside parcel of stay tube (502) has outer package pipe (504), the outside parcel of outer package pipe (504) has buffer tube (505), the pipe wall embedding of buffer tube (505) has extrusion tubule (506), oval lumen (507) have been seted up at the middle part of extrusion tubule (506), be connected with triangle cavity (508) between stay tube (502), fixed strip (503) and outer package pipe (504), triangle cavity (508) inside packing has fire prevention filler (509).

9. The portable low voltage composite cable of claim 8, wherein said support tube (502) is a hexagonal tube, said support tube (502) being of unitary construction with a fixation bar (503);

the fixing strips (503) positioned on the outer side of the supporting tube (502) are connected with the outer wrapping tube (504), and the fixing strips (503) positioned on the inner side of the supporting tube (502) are connected with the inner wrapping tube (501).

10. The composite convenient low-voltage cable according to claim 8, wherein the extrusion tubules (506) are provided in a plurality, the outer sides of the extrusion tubules (506) are connected with the outer wrapping tube (504), and the long axis extension lines of the ellipses corresponding to the ellipses of the lumen (507) pass through the circle center of the corresponding circle of the buffer tube (505).