CN113205909B

CN113205909B - Buried composite cable

Info

Publication number: CN113205909B
Application number: CN202110493272.XA
Authority: CN
Inventors: 卜凡强; 周宗民; 李龙龙
Original assignee: Guangdong Jinggong Cable Industry Co ltd
Current assignee: Guangdong Jinggong Cable Industry Co ltd
Priority date: 2021-05-07
Filing date: 2021-05-07
Publication date: 2022-12-06
Anticipated expiration: 2041-05-07
Also published as: CN113205909A

Abstract

The invention discloses a buried composite cable, which belongs to the technical field of cables, and the buried composite cable can simultaneously extrude an inner core body when a cable body is extruded and bent, can elastically support the inner core body through an elastic supporting strip, and simultaneously buffers the extrusion force, and improves the protection performance and the strength of the cable body; when the outer part of the cable body is damaged, the inner protective filling glue flows out, so that the outer protective sleeve layer can be bonded to the damaged part of the outer protective sleeve layer for temporary protection, and the influence caused by the fact that subsequent external substances and the like enter the cable body can be avoided; when the short circuit scheduling problem punctures and catches fire when cable body is inside to appear, the back is burnt to the sealing membrane, through elastic membrane reply elasticity with magnesium oxide powder around the inside inner core body of cable body, can effectually control the intensity of a fire on the inner core body, avoid it further to stretch and cause bigger danger.

Description

Buried composite cable

Technical Field

The invention relates to the technical field of cables, in particular to a buried composite cable.

Background

A cable is a device for transmitting electric energy or signals, and generally comprises several or several groups of wires, and transmits electric power or information from one place to another place, and the cable has the characteristics of internal electrification and external insulation. The cable includes power cable, control cable, compensation cable, shielding cable, high temperature cable, computer cable, signal cable, coaxial cable, fire-resistant cable, marine cable, mining cable, aluminum alloy cable, etc

In modern industry and life, whether power systems, information transmission systems or instrument systems, power or information transmission is carried out by means of corresponding cables. Electric power becomes an essential important part in life, and due to the reasons of shortage of urban land, high traffic pressure, urban construction and the like, large cities generally adopt a mode of transmitting power by burying cables underground. Compared with an overhead line, the cable has the advantages of small occupied area, reliable power transmission, strong anti-interference capability and the like.

The existing buried cable is easy to cause extrusion inside the cable and damage outside the cable due to external environment, construction and the like in the using process, has poor protectiveness and low strength, and is short in service life, and the cable is easy to cause more serious subsequent influence due to no effective temporary protection measures after being damaged; meanwhile, once the existing cable has a local problem and is punctured and ignited, the existing cable cannot prevent the fire from spreading in time, and is very easy to cause greater danger, so that the danger of electric leakage or short circuit is more easily caused, and the production cost of the cable is increased. Therefore, a buried composite cable is proposed to solve the above problems.

Disclosure of Invention

1. Technical problem to be solved

Aiming at the problems in the prior art, the invention aims to provide a buried composite cable, in the scheme, when a cable body is extruded and bent, an inner core body is extruded at the same time, the inner core body can be elastically supported through an elastic supporting strip, and the extrusion force of the inner core body is buffered at the same time, so that a certain yielding buffer space is formed, the bending and extrusion flexibility of the inner core body are ensured, the cable body is prevented from being easily damaged when being pressed, and the protection performance and the strength of the cable body are improved; according to the scheme, the protective filling glue inside the cable body flows out after the outer part of the cable body is damaged, so that the protective filling glue can be bonded to the damaged part outside the outer sheath layer for temporary protection, and the influence caused by the fact that subsequent external substances and the like enter the cable body can be avoided; this scheme is when the inside short circuit scheduling problem that appears of cable body punctures and catches fire, and the back is burnt out to the seal membrane, through elastic membrane reply elasticity pop out its inside magnesia powder around the inside inner core body of cable body, can effectually control the intensity of a fire on the inner core body, avoids it to stretch and causes bigger danger, and it is convenient for subsequent maintenance work of overhauing equally.

2. Technical scheme

In order to solve the above problems, the present invention adopts the following technical solutions.

A buried composite cable comprises a cable body, wherein a reinforcing core is arranged in the cable body, four separating ribs are uniformly and fixedly connected to the outer wall of the reinforcing core, an inner protective layer is fixedly sleeved at the other ends of the separating ribs, four inner cavities are formed between the inner protective layer and the four separating ribs, an inner core body is connected in each inner cavity, a plurality of placing grooves are formed in the inner protective layer, a sealing film is fixedly connected to one end, close to the inner cavity, of each placing groove, an elastic film is fixedly connected to the inner wall of each inner cavity, magnesium oxide powder is placed in each elastic film, gas is filled between the sealing films of the elastic films, an armor layer is fixedly sleeved outside the inner protective layer, and an outer sheath layer is fixedly sleeved on the outer wall of the armor layer; each inner core body can be separated through the action of the plurality of separating ribs, and the influence caused by mutual contact and extrusion between the adjacent inner core bodies can be prevented; the armor layer can protect the inner core body inside so as to prevent the inner core body from being damaged during transportation and installation, and meanwhile, the armor layer plays a role in shielding an electric field, and the outer sheath layer mainly plays a role in protecting the cable body inside so as to protect the cable body from being damaged by machinery, moisture, humidity, chemicals and the like.

Further, the inner core is including the conductor heart yearn, the external fixation of conductor heart yearn has cup jointed the conductor shield, the fixed insulating layer that has cup jointed of conductor shield outer wall, the fixed insulating shield that has cup jointed of insulating layer outer wall, the fixed metal shielding layer that has cup jointed of insulating shield outer wall. The insulating layer can insulate the conductor core wire from the outside to prevent external personnel from being injured by electric shock, the insulating shielding layer is fixedly sleeved on the outer wall of the insulating layer, the conductor shielding layer and the insulating shielding layer are required to prevent the cable from being damaged by insulation, mechanical damage, fire or electrical interference and the like, so that the cable cannot normally work, and can be in good contact with the insulating layer, and partial discharge is avoided between the conductor core wire and the insulating layer; the fixed metal shielding layer that has cup jointed of insulating barrier outer wall, the electromagnetic field shielding that causes when the metal shielding layer can be with the cable body circular telegram is internal at the inner core to reduce the electromagnetic interference to the external world production, also play the influence of restriction external electromagnetic field to inside production simultaneously, certain lightning protection and homogenization electric field in addition, prevent axial discharge's characteristic.

Further, the inner wall that interior sheath is located between two separation ribs and the both sides of separating the rib have all seted up multiunit buffer bank, every buffer bank is including two buffer slots, sliding connection elastic support strip in the buffer slot, every the inner core body all is located between the elastic support strip of the separation rib of both sides and interior sheath inner wall, just the inner core body outer wall laminating elastic support strip strong point. When because of the wiring construction with during the extrusion and the bending that cause the cable body in the transportation storage process, the extrusion force of cable body can directly conduct the inside extrusion that causes the inner core of cable body, the elastic support bar can have elastic support to the inner core, the inner core can make the elastic support bar form certain deformation simultaneously, and can drive the elastic support bar both sides and slide along the dashpot, and then cushion the extrusion force of inner core, certain yielding buffer space has been formed, thereby the inner core is crooked and receive extruded pliability, the easy emergence damage when having avoided it to receive pressure, further the extrusion of mutual contact before having avoided a plurality of inner cores, the life-span of inner core has been improved, and the protectiveness and the intensity of cable body have been improved.

Further, a plurality of groups of cavities have been seted up to the inside of oversheath layer, the cavity is internal to be stored to protect and to fill glue, when because construction or other reasons cause the outside damaged back of cable body, the damaged back of oversheath layer, the inside protection of cavity is filled glue and will is flowed, after the protection is filled glue and is contacted micro steam in the air, will be polymerized the solidification rapidly by the catalysis and adhere, thereby can bond and carry out interim protection at the outside damaged position of oversheath layer, can avoid follow-up foreign matter etc. to enter into the inside influence that causes of cable body, can provide longer guard time buffering for artifical subsequent maintenance, improve the time of its use.

Further, an insulating rubber layer is fixedly connected to the outer wall of the metal shielding layer; can be when the inside unexpected burning of cable body through being provided with insulating rubber layer, can lead to melting and producing certain viscidity of insulating rubber layer burning certain degree, can carry out the adhesion to outside magnesium oxide powder, and then can form a magnesium oxide powder layer at the surface of inner core body, form the flame retardant efficiency to the intensity of a fire, further improve the fire prevention flame retardant efficiency of inner core body, be favorable to the security of cable.

Furthermore, the insulating layer is made of polyvinyl chloride materials, the conductor shielding layer and the insulating shielding layer are both made of semi-conductive materials, and the polyvinyl chloride materials are widely applied as the insulating layer of the cable and have good insulating effect; the conductor shielding layer and the insulation shielding layer are made of semiconductive materials, so that the roundness of a conductor core wire and the smoothness and tightness of an interface between the insulation layer and the semiconductive layer are greatly improved, the voltage resistance level of the cable body is improved, and the service life of the cable body is prolonged.

Furthermore, the armor layer is composed of a plurality of hot-dip galvanized steel wires, the hot-dip galvanized steel wires are uniformly and fixedly connected between the inner protective layer and the outer protective sleeve layer, the inner core body can be better protected through the hot-dip galvanized steel wires, meanwhile, hot-dip galvanizing is one of the most effective anticorrosive coatings of the steel wires, and the inner core body can be protected by the inner protective layer from being damaged by the hot-dip galvanized steel wires.

Further, interior sheath and oversheath layer are made by the polyethylene material, and polyethylene is insoluble in general solvent at ordinary temperature, and the hydroscopicity is little, and electrical insulation is good, and chemical stability is good, is good protective material, can make the better protection cable body of oversheath layer to and the better protection inner core body of interior sheath.

Furthermore, the outer wall of the insulating rubber layer is connected with color bar color separation insulating sections in an embedded mode, the color of each color bar color separation insulating section on the insulating rubber layer outside the inner core body is different from that of each color bar color separation insulating section on the insulating rubber layer outside the inner core body, the inner core bodies with different functions can be visually distinguished through the color bar color separation insulating sections with different colors on the insulating rubber layer outside the inner core bodies, and subsequent installation and maintenance are facilitated.

Further, the inside fixedly connected with conduction heat dissipation layer of separating the rib, the heat accessible conduction heat dissipation layer that each inner core body produced in the use transmits for interior sheath, and armor and oversheath layer are transmitted to in the rethread inner sheath, finally reach the external world, improve the radiating effect of cable body.

3. Advantageous effects

Compared with the prior art, the invention has the advantages that:

(1) This scheme can separate each inner core body through the effect of a plurality of separation ribs, can prevent to contact each other between the adjacent inner core body and extrude and cause the influence to can prevent that adjacent inner core body from breaking the back and influencing each other, it is strong to the barrier propterty of cable.

(2) When the extrusion that causes the cable body and crooked because of the wiring construction in this scheme and in the transportation storage process, the extrusion force can directly conduct and cause the extrusion to the inner core body in the cable body, can have elastic support to the inner core body through the elastic support bar, the inner core body can make the elastic support bar form certain deformation simultaneously, and can drive the elastic support bar both sides and slide along the dashpot, and then cushion the extrusion force of inner core body, certain yielding buffer space has been formed, thereby the inner core body is crooked and the pliability that receives the extrusion has been guaranteed, the easy emergence damage when having avoided it to receive pressure, further avoid the extrusion of mutual contact before a plurality of inner core bodies, the life-span of the inner core body has been improved, and the protectiveness and the intensity of cable body have been improved, excellent in use effect.

(3) When construction or other reasons cause the outside damaged back of cable body in this scheme, the inside protection of cavity will flow out after the oversheath layer is damaged, after the protection is filled glue and is contacted micro steam in the air, will be adhered to by the rapid polymerization solidification of catalysis, thereby can bond and protect temporarily at the outside damaged position of oversheath layer, can avoid follow-up foreign matter etc. to enter into the inside influence that causes of cable body, can provide longer guard time buffering for artifical subsequent maintenance, improve the time of its use.

(4) When the sealing film is burnt, the elastic film can pop out magnesium oxide powder inside the elastic film to the periphery of the inner core body inside the cable body due to the fact that the gas overflows, the fire on the inner core body can be effectively controlled, and the phenomenon that the fire spreads to cause greater danger can be avoided; insulating rubber layer burning to a certain extent can produce certain viscidity after melting simultaneously, can carry out the adhesion to outside magnesium oxide powder and form a magnesium oxide powder layer, forms the flame retardant efficiency to the intensity of a fire, further improves the fire prevention flame retardant efficiency of inner core body, is favorable to this composite cable's security, and it is convenient for subsequent maintenance work, and reduces more losses equally.

(5) The inside core body of different effects can audio-visual differentiation of the outside ribbon colour separation insulating segment of different colours of insulating rubber layer in this scheme, makes things convenient for subsequent installation to overhaul, and the heat accessible conduction heat dissipation layer that each inside core body produced in the use simultaneously transmits for interior sheath, and armor and oversheath layer are transmitted in the interior sheath of rethread, finally transmit the external world, improve the radiating effect of cable body.

Drawings

FIG. 1 is a schematic cross-sectional view of a cable body according to the present invention;

FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1;

FIG. 3 is an enlarged view of the structure at B in FIG. 1;

FIG. 4 is a schematic view of the internal structure of the core body according to the present invention;

FIG. 5 isbase:Sub>A schematic sectional view of the structure A-A in FIG. 1.

The numbering in the figures illustrates:

1. a cable body; 2. a reinforcement core; 3. separating ribs; 4. an inner protective layer; 5. an inner cavity; 6. an inner core body; 7. a placement groove; 8. a sealing film; 9. an elastic film; 10. hot dip galvanized steel wire; 11. an outer jacket layer; 12. a conductor core wire; 13. a conductor shield layer; 14. an insulating layer; 15. an insulating shield layer; 16. a metal shielding layer; 17. a buffer tank; 18. an elastic support bar; 19. a cavity; 20. the color bar is used for separating colors and insulating sections.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the connection can be direct connection or indirect connection through an intermediate medium, and can be communication inside the model adapting element. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example (b):

referring to fig. 1-2 and fig. 5, a buried composite cable includes a cable body 1, a reinforcement core 2 is disposed inside the cable body 1, the reinforcement core 2 can reinforce the cable body 1, radial tensile resistance of the cable body 1 can be improved, and bending resistance of the cable body 1 can be improved, four separation ribs 3 are uniformly and fixedly connected to the outer wall of the reinforcement core 2, each inner core 6 can be separated by the aid of the separation ribs 3, influence caused by mutual contact and extrusion between adjacent inner cores 6 can be prevented, the internal fixedly connected with heat dissipation layer separating the ribs 3 can transmit heat generated by each inner core 6 in a using process to the inner sheath 4 through the heat dissipation layer, and then the heat can be transmitted to an armor layer and an outer sheath layer 11 through the inner sheath 4, and finally transmitted to the outside, and heat dissipation effect of the cable body 1 is improved.

Referring to fig. 1 and 4, the inner sheath 4 is fixedly sleeved at the other end of each separation rib 3, four inner cavities 5 are formed between the inner sheath 4 and the four separation ribs 3, an inner core body 6 is connected in each inner cavity 5, the inner core body 6 comprises a conductor core wire 12, a conductor shielding layer 13 is fixedly sleeved outside the conductor core wire 12, an insulating layer 14 is fixedly sleeved on the outer wall of the conductor shielding layer 13, the insulating layer 14 can insulate the conductor core wire 12 from the outside to prevent external personnel from being injured by electric shock, an insulating shielding layer 15 is fixedly sleeved on the outer wall of the insulating layer 14, and the conductor shielding layer 13 and the insulating shielding layer 15 can prevent the composite cable from being affected by insulation damage, mechanical damage, fire or electrical interference and the like to work normally and can be in good contact with the insulating layer 14, so that partial discharge is avoided between the conductor core wire 12 and the insulating layer 14; the outer wall of the insulating shielding layer 15 is fixedly sleeved with a metal shielding layer 16, the metal shielding layer 16 can shield an electromagnetic field caused by the cable body 1 when being electrified in the inner core body 6 so as to reduce electromagnetic interference generated to the outside, and simultaneously, the metal shielding layer also has the characteristics of limiting the influence of the external electromagnetic field on the inside, preventing lightning and homogenizing the electric field and preventing axial discharge. The outer wall gomphosis on insulating rubber layer is connected with colour bar colour separation insulating section 20, and the colour diverse of the colour bar colour separation insulating section 20 on the insulating rubber layer of every inner core 6 outside, and the colour bar colour separation insulating section 20 through the different colours on each inner core 6 can audio-visually distinguish the inner core 6 of different effects, makes things convenient for subsequent installation to overhaul. The insulating layer 14 is made of polyvinyl chloride materials, the conductor shielding layer 13 and the insulating shielding layer 15 are both made of semiconductive materials, and the polyvinyl chloride materials are widely applied as insulating layers of cables and have good insulating effects; the conductor shielding layer 13 and the insulation shielding layer 15 are made of semiconductive materials, so that the roundness of the conductor core wire 12 and the smoothness and tightness of the interface between the insulation layer 14 and the semiconductive layer are greatly improved, the voltage resistance level of the cable body 1 is improved, and the service life of the cable body is prolonged.

Referring to fig. 1 and 2, a plurality of placing grooves 7 are formed in the inner sheath 4, a sealing film 8 is fixedly connected to one end of each placing groove 7 close to the inner cavity 5, an elastic film 9 is fixedly connected to the inner wall of the inner cavity 5, magnesium oxide powder is placed in the elastic film 9, and gas is filled between the sealing films 8 of the elastic film 9. When the inner core body 6 in the cable body 1 has breakdown due to problems such as short circuit and the like and external oxygen enters into the cable body to catch fire, gas between the elastic film 9 and the sealing film 8 is subjected to thermal expansion and drives the elastic film 9 to expand and swell, and when the sealing film 8 on the inner protective layer 4 is burnt by fire, the elastic film 9 ejects magnesium oxide powder in the cable body 1 to the periphery of the inner core body 6 by restoring elasticity of the elastic film 9 due to gas overflow, so that the fire on the inner core body 6 can be effectively controlled, further spread is prevented, greater danger is avoided, and the outer wall of the metal shielding layer is also fixedly connected with an insulating rubber layer; insulating rubber layer burning to a certain extent can produce certain viscidity after melting, can carry out the adhesion to outside magnesium oxide powder, and then can form a magnesium oxide powder layer at the surface of inner core body 6, forms the flame retardant efficiency to the intensity of a fire, further improves the fire prevention flame retardant efficiency of inner core body 6, is favorable to this composite cable's security, and it is convenient for subsequent maintenance work equally, and has reduced more losses.

Referring to fig. 1 and 5, an armor layer is fixedly sleeved outside the inner sheath layer 4, the armor layer can protect the inner core body 6 from being damaged during transportation and installation, and also plays a role of electric field shielding, the armor layer is composed of a plurality of hot-dip galvanized steel wires 10, the hot-dip galvanized steel wires 10 are uniformly and fixedly connected between the inner sheath layer 4 and the outer sheath layer 11, the inner core body 6 can be better protected by the hot-dip galvanized steel wires 10, meanwhile, hot-dip galvanized steel is one of the most effective anti-corrosion coatings for the steel wires, the inner sheath layer 4 can protect the inner core body 6 from being damaged by the hot-dip galvanized steel wires 10, the outer wall of the armor layer is fixedly sleeved with the outer sheath layer 11, and the outer sheath layer 11 mainly plays a role of protecting the inner part of the cable body 1 from being damaged by machinery, moisture, humidity, chemicals, and the like. Interior sheath 4 and oversheath layer 11 are made by the polyethylene material, and polyethylene is insoluble in general solvent at normal atmospheric temperature, and the hydroscopicity is little, and electrical insulation is good, and chemical stability is good, is good protective material, can make the better protection cable body 1 of oversheath layer 11 to and the better protection inner core body 6 of interior sheath 4.

Please refer to fig. 1 and fig. 3, the inner wall of the inner sheath 4 between the two separation ribs 3 and the two sides of the separation ribs 3 have all been provided with a plurality of groups of buffer groove groups, each buffer groove group includes two buffer grooves 17, there is an elastic support bar 18 in the buffer grooves 17, each inner core 6 is located between the separation ribs 3 on both sides and the elastic support bar 18 on the inner wall of the inner sheath 4, and the outer wall of the inner core 6 is attached to the elastic support bar 18 supporting point, when the cable body 1 is extruded and bent in the transportation and storage process due to wiring construction, the extrusion force of the cable body 1 can be directly transmitted to the inside of the cable body 1 to extrude the inner core 6, at this time, the inner core 6 can have elastic support to the inner core 6 through the elastic support bar 18 around the inner core 6, meanwhile, the inner core 6 can make the elastic support bar 18 form a certain deformation when extruding the elastic support bar 18, and can drive both sides of the elastic support bar 18 to slide along the buffer grooves 17, further buffer the extrusion force of the inner core 6, a certain yielding buffer space is formed, thereby ensuring the bending and avoiding the mutual contact of the inner core 6 and improving the service life of the inner core 6.

Please refer to fig. 1 and 5, a plurality of groups of cavities 19 are formed inside the outer sheath layer 11, the cavity 19 stores the protection filling glue, when the cable body 1 is damaged outside due to construction or other reasons, the outer sheath layer 11 is damaged, the protection filling glue inside the cavity 19 flows out, the protection filling glue is polymerized and cured rapidly and adhered by catalysis after contacting with trace water vapor in the air, thereby being capable of being adhered to the damaged part outside the outer sheath layer 11 for temporary protection, avoiding the influence caused by the fact that subsequent external substances enter the cable body 1, providing longer protection time buffer for manual subsequent maintenance, improving the using time of the cable body, and having strong practicability.

The working principle is as follows: when using, bury the composite cable of this scheme underground and use, can separate each inner core body 6 through the effect of a plurality of partition ribs 3, can prevent to contact each other between the adjacent inner core body 6 and extrude and cause the influence to can prevent to influence each other after adjacent inner core body 6 breaks, strong to this composite cable's barrier propterty.

When because of the wiring construction with during the extrusion and the bending that cause cable body 1 in the transportation storage process, cable body 1's extrusion force can directly conduct cable body 1 inside and cause the extrusion to core 6, elastic support bar 18 through core 6 around this moment can have elastic support to core 6, core 6 is when extrusion elastic support bar 18 simultaneously, can make elastic support bar 18 form certain deformation, and can drive elastic support bar 18 both sides and slide along dashpot 17, and then cushion core 6's extrusion force, certain yielding buffer space has been formed, thereby the core 6 is crooked and the pliability that receives the extrusion has been guaranteed, the easy emergence damage when having avoided it to receive pressure, further mutual contact extrusion before having avoided a plurality of cores 6, the life-span of core 6 has been improved, and the protectiveness and the intensity of cable body 1 have been improved, excellent in use effect.

When causing the outside damaged back of cable body 1 owing to construction or other reasons, oversheath layer 11 is damaged back, the inside protection of cavity 19 is filled glue and will be flowed, after protection is filled glue contact trace steam in the air, will be adhered to by the quick polymerization solidification of catalysis, thereby can adhere and protect temporarily at the outside damaged position of oversheath layer 11, can avoid follow-up foreign matter etc. to enter into cable body 1 inside and cause the influence, can provide longer guard time buffering for artifical subsequent maintenance, improve the time of its use, therefore, the clothes hanger is strong in practicability.

When the inner core body 6 in the cable body 1 is broken down due to problems such as short circuit and the like, and external oxygen enters into the cable, gas between the elastic membrane 9 and the sealing membrane 8 is subjected to thermal expansion at the moment, the elastic membrane 9 is driven to expand and swell, and after the sealing membrane 8 on the inner sheath 4 is burnt by fire, the elastic membrane 9 ejects magnesium oxide powder in the elastic membrane 9 to the periphery of the inner core body 6 in the cable body 1 due to the overflow of the gas and the return elasticity of the elastic membrane 9, so that the fire on the inner core body 6 can be effectively controlled, further spreading is prevented, greater danger is avoided, and the outer wall of the metal shielding layer is fixedly connected with an insulating rubber layer; insulating rubber layer burning to a certain extent can produce certain viscidity after melting, can carry out the adhesion to outside magnesium oxide powder, and then can form a magnesium oxide powder layer at the surface of inner core body 6, forms the flame retardant efficiency to the intensity of a fire, further improves the fire prevention flame retardant efficiency of inner core body 6, is favorable to this composite cable's security, and it is convenient for subsequent maintenance work equally, and has reduced more losses.

The foregoing is only a preferred embodiment of the present invention; the scope of the invention is not limited thereto. Any person skilled in the art should be able to cover the technical scope of the present invention by equivalent or modified solutions and modifications within the technical scope of the present invention.

Claims

1. A buried composite cable comprises a cable body (1), and is characterized in that: the cable comprises a cable body (1), wherein the cable body comprises a reinforcing core (2), four separation ribs (3) are uniformly and fixedly connected with the outer wall of the reinforcing core (2), an inner protection layer (4) is fixedly connected with the other end of each separation rib (3), four inner cavities (5) are formed between the inner protection layer (4) and the four separation ribs (3), an inner core body (6) is connected in each inner cavity (5), a plurality of placing grooves (7) are formed in the inner protection layer (4), the placing grooves (7) are close to one end of each inner cavity (5) and are fixedly connected with sealing films (8), an elastic film (9) is fixedly connected with the inner wall of each inner cavity (5), magnesium oxide powder is placed in each elastic film (9), gas is filled between the sealing films (8) of the elastic films (9), an armor layer is connected outside the inner protection layer (4), an outer protective jacket layer (11) is connected with the outer wall of each armor, the inner protection layer (4) is positioned on the two inner walls between the separation ribs (3) and the two sides of the separation ribs (3), a plurality of groups of buffer grooves (17) are formed on the inner walls, each buffer groove (17) is positioned on the two inner walls (17) and each support bar (6), and each support bar (17) are positioned on the two inner side of each inner protection layer (6), and the outer wall of the inner core body (6) is attached to the supporting points of the elastic supporting strips (18).

2. A buried composite cable according to claim 1, wherein: inner core body (6) including conductor heart yearn (12), conductor shielding layer (13) has been cup jointed to the external fixation of conductor heart yearn (12), the fixed cover of conductor shielding layer (13) outer wall has cup jointed insulating layer (14), insulating layer (14) outer wall is fixed to have cup jointed insulating shielding layer (15), the fixed cover of insulating shielding layer (15) outer wall has cup jointed metallic shield layer (16).

3. A buried composite cable according to claim 1, wherein: a plurality of groups of cavities (19) are formed in the outer sheath layer (11), and protective filling glue is stored in the cavities (19).

4. A buried composite cable according to claim 2, wherein: the outer wall of the metal shielding layer (16) is also fixedly connected with an insulating rubber layer.

5. A buried composite cable according to claim 2, wherein: the insulating layer (14) is made of polyvinyl chloride materials, and the conductor shielding layer (13) and the insulating shielding layer (15) are made of semi-conductive materials.

6. A buried composite cable according to claim 1, wherein: the armor layer is composed of a plurality of hot dip galvanizing steel wires (10), and the hot dip galvanizing steel wires (10) are uniformly and fixedly connected between the inner sheath layer (4) and the outer sheath layer (11).

7. A buried composite cable according to claim 1, wherein: the inner protective layer (4) and the outer protective sleeve layer (11) are both made of polyethylene materials.

8. A buried composite cable according to claim 4, wherein: the outer wall of the insulating rubber layer is connected with a color bar color separation insulating section (20) in an embedded mode, and the color of the color bar color separation insulating section (20) on the outer insulating rubber layer of each inner core body (6) is different.

9. A buried composite cable according to claim 1, wherein: the inside fixedly connected with of separating rib (3) conducts the heat dissipation layer.