CN213716571U - Fire-resistant subway signal cable - Google Patents
Fire-resistant subway signal cable Download PDFInfo
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- CN213716571U CN213716571U CN202022381681.4U CN202022381681U CN213716571U CN 213716571 U CN213716571 U CN 213716571U CN 202022381681 U CN202022381681 U CN 202022381681U CN 213716571 U CN213716571 U CN 213716571U
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- fireproof
- cable
- resistant
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- 230000009970 fire resistant effect Effects 0.000 title claims abstract description 26
- 229910052751 metal Inorganic materials 0.000 claims abstract description 19
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- 239000010410 layer Substances 0.000 claims description 122
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- 230000002265 prevention Effects 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 9
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Abstract
The invention provides a fire-resistant subway signal cable, which comprises a cable core and a sheath structure coated outside the cable core; the cable core comprises at least one conductor group, the conductor group comprises four insulated single lines which are twisted in different colors, and a first fireproof layer, a first metal shielding layer and a second fireproof layer are sequentially coated outside the insulated single lines from inside to outside. The cable has the advantages of reasonable structural design, excellent thermal stability, moisture resistance, mechanical and physical properties, high flame retardance, high temperature resistance and fire resistance, long service life, high safety coefficient and good service performance. Even under the condition of fire, this cable also can guarantee that the cable normally works under higher temperature, can effectively prolong the rescue time, reduces the loss.
Description
Technical Field
The invention belongs to the technical field of cable industry, and particularly relates to a fire-resistant subway signal cable.
Background
Subways, light rails, trams and maglev trains are usually one of the largest infrastructures of cities, and are also the main arteries and city lifelines of urban passenger traffic. As a public transport means with larger capacity, the safety of the public transport means is directly related to the life safety of the majority of passengers. Traditional flame retardant cable and low smoke and low halogen flame retardant cable fire resistance is poor, and because cable design defect, can not carry out real-time supervision to the cable temperature, the cable can release has corrosive halogen acid gas when burning or being heated to produce a large amount of highly toxic dense smoke, in underground narrow and small space, personnel and equipment are highly intensive, in case the conflagration takes place, the time of extinguishing by oneself after the cable burning is long, bring very big difficulty for disaster relief work, cause great life and property loss.
Disclosure of Invention
In view of this, the present invention provides a fire-resistant subway signal cable, which is designed to overcome the defects in the prior art.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a fire-resistant subway signal cable comprises a cable core and a sheath structure coated outside the cable core; the cable core comprises at least one conductor group, the conductor group comprises four insulated single wires which are twisted in different colors, and a first fireproof layer, a first metal shielding layer and a second fireproof layer are sequentially coated outside the insulated single wires from inside to outside; the insulating single wire comprises a conductor, and an insulating layer and a fire-resistant layer are sequentially coated on the outer side of the conductor; the protective layer structure comprises a third fireproof layer, a first oxygen isolation layer, a fourth fireproof layer, a second metal shielding layer, a second oxygen isolation layer, a steel strip armor layer, a fifth fireproof layer and an outer sheath which are sequentially coated from inside to outside, and a thermocouple induction wire is arranged between the fifth fireproof layer and the outer sheath.
Furthermore, the first fireproof layer and the second fireproof layer are both glass fiber belt layers.
Further, the third fire prevention layer adopts a mica tape layer.
Further, the fire-resistant layer adopts an ore wool pipe.
Furthermore, the first metal shielding layer adopts a corrugated copper pipe.
Furthermore, the fourth fireproof layer and the fifth fireproof layer are both inorganic fireproof coating layers.
Compared with the prior art, the invention has the following advantages:
the cable has the advantages of reasonable structural design, excellent thermal stability, moisture resistance, mechanical and physical properties, high flame retardance, high temperature resistance and fire resistance, long service life, high safety coefficient and good service performance. Even under the condition of fire, this cable also can guarantee that the cable normally works under higher temperature, can effectively prolong the rescue time, reduces the loss.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the invention without limitation. In the drawings:
FIG. 1 is a schematic structural diagram of the present invention;
fig. 2 is a schematic view of the inventive embodiment with a support body.
Description of reference numerals:
1. insulating the single wire; 2. a conductor; 3. an insulating layer; 4. a refractory tube; 5. a wire group; 6. a first fire resistant layer; 7. a first metal shielding layer; 8. a second fire-resistant layer; 9. a third fire prevention layer; 10. a first oxygen barrier layer; 11. a fourth fire resistant layer; 12. a second metal shielding layer; 13. a second oxygen barrier layer; 14. a steel tape armor layer; 15. a fifth fire resistant layer; 16. a thermocouple induction wire; 17. an outer sheath.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which are merely for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be construed broadly, e.g. as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
The invention will be described in detail with reference to the following embodiments with reference to the attached drawings.
A fire-resistant subway signal cable, as shown in figure 1, comprises a cable core and a sheath structure coated outside the cable core; the cable core comprises at least one conductor group 5, the conductor group comprises four insulating single lines 1 which are twisted in different colors, and a first fireproof layer 6, a first metal shielding layer 7 and a second fireproof layer 8 are sequentially coated outside the insulating single lines from inside to outside; the insulating single wire comprises a conductor 2, and an insulating layer 3 and a fire-resistant layer 4 are sequentially coated on the outer side of the conductor.
The sheath structure comprises a third fireproof layer 9, a first oxygen isolation layer 10, a fourth fireproof layer 11, a second metal shielding layer 12, a second oxygen isolation layer 13, a steel strip armor layer 14, a fifth fireproof layer 15 and an outer sheath 17 which are sequentially coated from inside to outside, and a thermocouple induction wire 16 is arranged between the fifth fireproof layer and the outer sheath.
The thermocouple induction wire can detect the temperature of the cable in real time, when the scheme of the invention is implemented, the thermocouple can be connected with a host of a monitoring room to feed back the temperature of the cable in real time, in addition, the thermocouple can also be connected with an alarm, and when the temperature of the cable exceeds the limit, the alarm gives an alarm to prompt relevant maintenance personnel.
Foretell first flame retardant coating and second flame retardant coating all adopt the glass fiber band layer, and is specific, and first flame retardant coating and second flame retardant coating all adopt the double-deck package of wrapping of glass fiber band that thickness is 0.02 ~ 0.05mm to form, and it is every layer to take the lid rate to be greater than or equal to 30%. It has the advantages of non-combustion, corrosion resistance, high temperature resistance, small moisture absorption, etc.
The third fire prevention layer adopts a mica tape layer. Specifically, the third fire prevention layer is formed by double-layer lapping of mica tapes with the thickness of 0.08-0.15 mm, and the lapping rate of each layer is more than or equal to 60%. The mica tape has the advantages of small expansion coefficient, high dielectric strength, high resistivity, uniform dielectric constant and high heat-resistant grade, and can reach the A-grade fire resistance.
The fire-resistant layer adopts the mineral wool pipe, the mineral wool pipe which is made of mineral fiber cotton is used as a raw material, and the fire-resistant layer has the advantages of light weight, high melting point, no combustion even at high temperature and good fire-resistant effect.
The first metal shielding layer is a corrugated copper pipe. Specifically, the first metal shielding layer is a corrugated copper pipe which is made of a copper strip with the thickness of 0.1mm through a welding and embossing process, the shielding effect is good, and the first metal shielding layer is free from other external interference in the signal transmission process and can effectively ensure the running safety of a train. In addition, the corrugated copper pipe shielding layer is firm and not easy to deform, and the cable has high tensile strength and bending performance.
The second metallic shield layer is typically an aluminum jacket, a composite jacket, or a copper shield. The cable has strong shielding performance, and the anti-interference performance, the mechanical and physical performance and the moisture resistance of the cable are improved.
The fourth fireproof layer and the fifth fireproof layer are both inorganic fireproof coating layers. Specifically, the fourth fireproof layer and the fifth fireproof layer are mainly composed of metal nitride and phosphoric acid, and the thickness of the fourth fireproof layer and the fifth fireproof layer is usually not less than 0.5mm, so that the fireproof coating can resist 2000 ℃ and the cable is good in overall flame retardant property and high in safety coefficient.
The outer sheath is usually a polyester concrete non-combustible layer, has excellent performances of fire prevention, fire resistance, flame retardance, no toxicity and the like, ensures the smooth circuit in case of fire, plays a role in firm protection, improves the flame-retardant and fireproof performances of the cable, and prolongs the service life of the cable.
When the cable is manufactured, the surface of a copper conductor is extruded with an insulating layer, and then the insulating layer is coated with a layer of mineral wool pipe made of mineral fiber wool serving as a raw material, so that the manufacture of the insulating single wire is completed.
And then twisting the 4 produced insulated single wires with different colors by using a high-speed star twister, then wrapping a layer of glass fiber tape with the thickness of 0.04mm outside the 4 twisted insulated single wires with different colors by using a wrapping process to prepare a first fireproof layer, then wrapping a copper tape with the thickness of 0.1mm outside the first fireproof layer by using a welding embossing process to prepare a first metal shielding layer, wrapping a layer of glass fiber tape with the thickness of 0.04mm outside the first metal shielding layer by using a wrapping process to prepare a second fireproof layer, and finishing the manufacture of the wire group.
The method comprises the steps of stranding a plurality of lead groups together by a high-speed cabling machine to manufacture a cable core, coating a layer of glass fiber belt with the thickness of 0.1mm outside the cable core by a wrapping process to manufacture a third fire prevention layer, coating fiber reinforced thermosetting plastic outside the third fire prevention layer by an extrusion molding process to manufacture a first oxygen isolation layer, coating a layer of inorganic fire-resistant coating with the thickness of 0.8mm outside the first oxygen isolation layer to manufacture a fourth fire prevention layer, coating a layer of aluminum sheath on the fourth fire prevention layer by an aluminum plate with the thickness of 1.2mm by an argon arc welding continuous welding process to manufacture a second metal shielding layer, and coating a layer of fiber reinforced thermosetting plastic outside the second metal shielding layer by an extrusion molding process to manufacture a second oxygen isolation layer.
Then, a double-layer galvanized steel strip gap is wrapped outside the second oxygen separation layer to form an armor layer, wherein the wrapping gap is not more than 40% of the width of the steel strip, the gap of the inner steel strip is covered by the middle part of the outer steel strip, the steel strip armor layer is wrapped by a layer of inorganic fireproof coating with the thickness of 1.0mm to form a fifth fireproof layer, then a thermocouple induction wire which is prepared in advance is fixed on the surface of the fifth fireproof layer, and then a layer of polyester concrete non-combustible outer sheath is wrapped outside the fifth fireproof layer and the thermocouple induction wire.
In an alternative embodiment, as shown in fig. 2, in order to avoid the cables from being damaged by pressure during the laying, fixing and using processes, a support may be disposed in the sheath structure, and when the structure is designed, the support includes a bracket 18, and a support member 19 is disposed on each support arm of the bracket, and the bracket is generally designed in an X-shaped structure. The supporting part is preferably of an integral arc-shaped structure, and a buffer gap 20 is reserved between the outer side surface of the supporting part and the third fireproof layer. The wire group is arranged in the containing cavity between the two support arms to form a better protection effect. When the number of the lead groups included by the cable core is less than 4, the solid rubber body can be filled in the containing cavity without the lead groups, so that the tensile and anti-extrusion performance of the cable is improved.
In the laying and using process, when the deformation amount of the sheath structure exceeds the range of the buffer gap, the support body can play an effective supporting role to protect the cable core. In order to ensure the complete performance of the cable, the supporting body can also be of a sectional structure, namely, a plurality of supporting bodies are arranged at intervals in the length direction of the cable, and the supporting body also can play a good role in protecting the cable core.
The cable has the advantages of reasonable structural design, excellent thermal stability, moisture resistance, mechanical and physical properties, high flame retardance, high temperature resistance and fire resistance, long service life, high safety coefficient and good service performance. The thermocouple induction line can monitor the temperature of the cable in real time, and if the temperature of the cable is over-limited due to short circuit caused by overload of the cable or other reasons, maintenance personnel can take emergency measures at the first time, so that fire accidents and unnecessary loss are reduced. Even under the condition of conflagration breaing out, the fire resistive construction of this cable design also can guarantee that the cable normally works under higher temperature, can effectively prolong the rescue time, reduces the loss.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, so that any modifications, equivalents, improvements and the like, which are within the spirit and principle of the present invention, should be included in the scope of the present invention.
Claims (6)
1. A fire-resistant type subway signal cable is characterized in that: comprises a cable core and a sheath structure coated outside the cable core; the cable core comprises at least one conductor group, the conductor group comprises four insulated single wires which are twisted in different colors, and a first fireproof layer, a first metal shielding layer and a second fireproof layer are sequentially coated outside the insulated single wires from inside to outside; the insulating single wire comprises a conductor, and an insulating layer and a fire-resistant layer are sequentially coated on the outer side of the conductor; the protective layer structure comprises a third fireproof layer, a first oxygen isolation layer, a fourth fireproof layer, a second metal shielding layer, a second oxygen isolation layer, a steel strip armor layer, a fifth fireproof layer and an outer sheath which are sequentially coated from inside to outside, and a thermocouple induction wire is arranged between the fifth fireproof layer and the outer sheath.
2. The fire-resistant subway signal cable according to claim 1, wherein: the first fireproof layer and the second fireproof layer are both made of glass fiber tape layers.
3. The fire-resistant subway signal cable according to claim 1, wherein: and the third fire prevention layer adopts a mica tape layer.
4. The fire-resistant subway signal cable according to claim 1, wherein: the fire-resistant layer adopts an ore wool pipe.
5. The fire-resistant subway signal cable according to claim 1, wherein: the first metal shielding layer is a corrugated copper pipe.
6. The fire-resistant subway signal cable according to claim 1, wherein: and the fourth fireproof layer and the fifth fireproof layer are both inorganic fireproof coating layers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022381681.4U CN213716571U (en) | 2020-10-23 | 2020-10-23 | Fire-resistant subway signal cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022381681.4U CN213716571U (en) | 2020-10-23 | 2020-10-23 | Fire-resistant subway signal cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213716571U true CN213716571U (en) | 2021-07-16 |
Family
ID=76799886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022381681.4U Expired - Fee Related CN213716571U (en) | 2020-10-23 | 2020-10-23 | Fire-resistant subway signal cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213716571U (en) |
-
2020
- 2020-10-23 CN CN202022381681.4U patent/CN213716571U/en not_active Expired - Fee Related
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Granted publication date: 20210716 |