CN213905000U - Fire-resistant low-voltage cable - Google Patents
Fire-resistant low-voltage cable Download PDFInfo
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- CN213905000U CN213905000U CN202023091403.1U CN202023091403U CN213905000U CN 213905000 U CN213905000 U CN 213905000U CN 202023091403 U CN202023091403 U CN 202023091403U CN 213905000 U CN213905000 U CN 213905000U
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Abstract
The utility model discloses a fire-resistant low-voltage cable, which comprises a core wire and a core wire outer cladding layer, wherein the core wire outer cladding layer is wrapped on the surface of the core wire; the core wire comprises a plurality of internal stranded wires, the core wire is stranded into a wire bundle through the internal stranded wires, and the surface of the core wire is wrapped with an external waterproof sleeve (5); the core wire outer cladding comprises a flame-retardant polyvinyl fluoride insulating sheath (2), a profiled steel sheath (3) and a fire-resistant mica layer I (4); the first fireproof mica layer (4) is wrapped on the outer waterproof sleeve (5), and the first fireproof mica layer (4) is formed by wrapping a fireproof mica tape on the surface of the outer waterproof sleeve (5); the profiled steel sheath (3) comprises a plurality of copper strips, and the copper strips are wrapped on the first refractory mica layer (4) along the length extension direction of the core wire and are fixed through extrusion deformation. The utility model has the advantages of it can overcome prior art's drawback, and structural design is reasonable novel.
Description
Technical Field
The utility model relates to a fire-resistant low tension cable belongs to the power cable field.
Background
Fire-resistant cable means a cable that can be kept in operation safely for a certain period of time in the event of a flame burn. Fire-resistant cables are widely used in places related to fire safety and fire life saving, such as high-rise buildings, underground railways, underground streets, large power stations, and important industrial and mining enterprises, for example, power supply lines and control lines of emergency facilities such as fire-fighting equipment and emergency guide lamps. The existing fire-resistant cable is poor in waterproofness, the fire-resistant polyvinyl fluoride insulating sheath on the surface of the fire-resistant cable is easy to damage under the conditions of aging, pressing, bending and the like, water is easy to enter after the fire-resistant polyvinyl fluoride insulating sheath is damaged, and particularly when a fire disaster occurs, the sprayed fire water enters the fire-resistant cable and then the fire-resistant cable is easy to age, so that the use of the fire-resistant cable is influenced.
SUMMERY OF THE UTILITY MODEL
The technical scheme of the utility model to exist among the prior art: "fire-retardant polyvinyl fluoride insulation sheath on fire-resistant cable surface all appears damaged under the condition such as ageing, pressurized, buckle easily, after fire-retardant polyvinyl fluoride insulation sheath is damaged, takes place into water easily, especially when the conflagration breaks out, and the fire water that sprays enters into in the fire-resistant cable after, also can cause fire-resistant cable's ageing easily, influences fire-resistant cable's use" not enough, provides a fire-resistant low tension cable.
In order to solve the technical problem, the technical scheme adopted by the utility model is that the fire-resistant low-voltage cable comprises a core wire and a core wire outer cladding layer, wherein the core wire outer cladding layer is wrapped on the surface of the core wire; the core wire comprises a plurality of internal stranded wires, the core wire is stranded into a wire bundle through the internal stranded wires, and the surface of the core wire is wrapped with an external waterproof sleeve; the core wire outer cladding layer comprises a flame-retardant polyvinyl fluoride insulating sheath, a profiled steel sheath and a fire-resistant mica layer I; the fire-resistant mica layer is wrapped on the outer waterproof sleeve, and the fire-resistant mica layer I is formed by wrapping a fire-resistant mica tape on the surface of the outer waterproof sleeve; the profiled steel sheath comprises a plurality of copper strips, and the copper strips are wrapped on the first refractory mica layer along the length extension direction of the core wire and are fixed through extrusion deformation; the flame-retardant polyvinyl fluoride insulating sheath is wrapped on the surface of the profiled steel sheath; the inside stranded conductor wraps up on the surface has inside waterproof cover, packs between the surface of outside waterproof cover and inside waterproof cover to have the silica gel buffer layer.
In the technical scheme of this application, inside waterproof jacket has been wrapped up on the surface of inside stranded conductor, has set up outside waterproof jacket on the surface of heart yearn, has improved the waterproof nature of the inside stranded conductor in heart yearn and the heart yearn. The silica gel buffer layer between outside waterproof jacket and the waterproof jacket of inside can not only protect inside waterproof jacket to silica gel is being pierced through the back, and the penetration hole can only leave a less hole under the internal stress effect of silica gel, makes outside infiltration be difficult to pass through the silica gel buffer layer, further improves the waterproof nature of heart yearn. The fire-resistant mica layer I and the profiled steel sheath have good fire resistance, and the core wire can be prevented from burning on fire in a period of time after the fire-resistant cable is influenced by high temperature, so that the fire resistance of the fire-resistant cable is ensured.
Preferably, the silica gel buffer layer is filled between two adjacent internal stranded wires of the fire-resistant low-voltage cable, and the silica gel buffer layer between the outer surface of the outer waterproof sleeve and the outer surface of the inner waterproof sleeve and the buffer layer between the two adjacent internal stranded wires are formed by pre-impregnating foamed silica gel after the core wires are twisted.
In this application, also filled the silica gel buffer layer between two adjacent inside stranded conductor, the silica gel buffer layer between two adjacent inside stranded conductor has played the effect of keeping apart two adjacent inside stranded conductor, prevents that two adjacent inside stranded conductor wearing and tearing from breaking.
Preferably, a second silica gel waterproof layer is arranged between the first fire-resistant mica layer and the outer waterproof sleeve, the second silica gel waterproof layer is wrapped on the outer waterproof sleeve, and the fire-resistant mica tape of the first fire-resistant mica layer is in pressing contact with the second silica gel waterproof layer.
In this application, the fire resistant mica tape of fire resistant mica layer one sticiss silica gel waterproof layer two in outside waterproof sheathe, when the thin damage of silica gel waterproof layer two emergence, can make the damaged department of silica gel waterproof layer two receive the extrusion and increase the contact pressure between the damaged face under pressure and prevent the infiltration entering through the pressure of fire resistant mica layer one for silica gel waterproof layer two also can have better waterproof nature when having tiny damage.
Optimized, above-mentioned fire-resistant low tension cable is provided with a plurality of inside tensile wires in the silica gel waterproof layer two, and inside tensile wire is on a parallel with the length extending direction setting of heart yearn, and inside tensile wire is the even distribution of annular between outside waterproof cover and fire-resistant mica layer one.
In this application, inside tensile cord has improved fire-resistant low tension cable's whole tensile, prevents that fire-resistant low tension cable from pulling back heart yearn and taking place disconnected silk or fracture.
Optimized, above-mentioned fire-resistant low tension cable, inside stranded conductor include a plurality of inside copper wires, and inside stranded conductor is the pencil by inside copper wire transposition, and inside copper wire wraps up on the surface has the silica gel covering.
In this application, inside stranded conductor is twisted by inside copper wire and is formed, and the silica gel covering of inside copper wire parcel on the surface has improved the waterproof nature of single inside copper wire, and then has improved the waterproof nature of whole fire-resistant low tension cable.
Optimized, the fire-resistant low-voltage cable is provided with a plurality of tensile steel wires in the internal stranded wire, the tensile steel wires are stranded with the internal copper wire to form the internal stranded wire, and the tensile steel wires are uniformly distributed in the internal stranded wire.
In this application, the tensile steel wire in the inside stranded conductor has improved the pull resistance of single inside stranded conductor, prevents that inside stranded conductor from receiving the condition that takes place inside copper wire broken string behind the pulling force.
Preferably, a second fire-resistant mica layer is arranged between the flame-retardant polyvinyl fluoride insulating sheath and the first fire-resistant mica layer, the second fire-resistant mica layer is formed by wrapping a fire-resistant mica tape on the surface of the first fire-resistant mica layer, and a copper strip of the profiled steel sheath is wrapped on the surface of the second fire-resistant mica layer.
In the application, the whole fire resistance of the fire-resistant low-voltage cable is improved by the arrangement of the fire-resistant mica layer II.
Preferably, an external buffer layer is arranged between the second fire-resistant mica layer and the first fire-resistant mica layer of the fire-resistant low-voltage cable, and the fire-resistant mica tape of the second fire-resistant mica layer is in pressing contact with the surface of the external buffer layer.
In this application, the outside buffer layer between fire resistant mica layer two and the fire resistant mica layer one is the silica gel, and fire resistant mica layer two and fire resistant mica layer one are kept apart to outside buffer layer, prevent to take place the friction between fire resistant mica layer two and the fire resistant mica layer one. And when the tiny damage takes place for the outside buffer layer, the pressure through fire resistant mica layer two can make the damaged department of outside buffer layer receive the extrusion and increase the contact pressure between the damaged face under pressure and prevent the infiltration entering for the outside buffer layer also can have better waterproof nature when there is tiny damage.
The utility model has the advantages of it can overcome prior art's drawback, and structural design is reasonable novel. In the technical scheme of this application, inside waterproof jacket has been wrapped up on the surface of inside stranded conductor, has set up outside waterproof jacket on the surface of heart yearn, has improved the waterproof nature of the inside stranded conductor in heart yearn and the heart yearn. The silica gel buffer layer between outside waterproof jacket and the waterproof jacket of inside can not only protect inside waterproof jacket to silica gel is being pierced through the back, and the penetration hole can only leave a less hole under the internal stress effect of silica gel, makes outside infiltration be difficult to pass through the silica gel buffer layer, further improves the waterproof nature of heart yearn. The fire-resistant mica layer I and the profiled steel sheath have good fire resistance, and the core wire can be prevented from burning on fire in a period of time after the fire-resistant cable is influenced by high temperature, so that the fire resistance of the fire-resistant cable is ensured.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The technical features of the present invention will be further explained with reference to the accompanying drawings and specific embodiments.
As shown in the figure, the utility model relates to a fire-resistant low-voltage cable, which comprises a core wire and a core wire outer cladding layer, wherein the core wire outer cladding layer is wrapped on the surface of the core wire; the core wire comprises a plurality of internal stranded wires, the core wire is stranded into a wire bundle through the internal stranded wires, and the surface of the core wire is wrapped with an external waterproof sleeve 5; the core wire outer cladding comprises a flame-retardant polyvinyl fluoride insulating sheath 2, a profiled steel sheath 3 and a fire-resistant mica layer I4; the first fire-resistant mica layer 4 is wrapped on the outer waterproof sleeve 5, and the first fire-resistant mica layer 4 is formed by wrapping a fire-resistant mica tape on the surface of the outer waterproof sleeve 5; the profiled steel sheath 3 comprises a plurality of copper strips, and the copper strips are wound on the first refractory mica layer 4 along the length extension direction of the core wire and are fixed through extrusion deformation; the flame-retardant polyvinyl fluoride insulating sheath 2 is wrapped on the surface of the profiled steel sheath 3; the surface of the internal stranded wire is wrapped with an internal waterproof sleeve 51, and a silica gel buffer layer 6 is filled between the external waterproof sleeve 5 and the external surface of the internal waterproof sleeve 51.
In the technical scheme of this application, inside waterproof jacket 51 has been wrapped up on the surface of inside stranded conductor, has set up outside waterproof jacket 5 on the surface of heart yearn, has improved the waterproof nature of the inside stranded conductor in heart yearn and the heart yearn. The silica gel buffer layer 6 between the outer waterproof jacket 5 and the inner waterproof jacket 51 can not only protect the inner waterproof jacket 51, but also can only leave a smaller hole under the action of the inner stress of the silica gel after the silica gel is penetrated, so that the water seepage from the outside is difficult to pass through the silica gel buffer layer 6, and the waterproofness of the core wire is further improved. Fire-resistant mica layer 4 and die mould steel sheath 3 have better fire-resistant type, can receive the core wire burning of catching fire in a period after high temperature influences at fire-resistant cable, guarantee fire-resistant cable's fire proofness.
The silica gel buffer layer 6 is filled between two adjacent internal stranded wires, and the silica gel buffer layer 6 between the outer surfaces of the external waterproof jacket 5 and the internal waterproof jacket 51 and the buffer layer between two adjacent internal stranded wires are formed by pre-dipping foamed silica gel after core wires are twisted.
In this application, also filled silica gel buffer layer 6 between two adjacent inside stranded conductor, silica gel buffer layer 6 between two adjacent inside stranded conductor has played the effect of keeping apart two adjacent inside stranded conductor, prevents that two adjacent inside stranded conductor wearing and tearing from breaking.
A silica gel waterproof layer II 7 is arranged between the external waterproof sleeve 5 and the fire-resistant mica layer I4, the silica gel waterproof layer II 7 is wrapped on the external waterproof sleeve 5, and the fire-resistant mica tape of the fire-resistant mica layer I4 is in surface pressing contact with the silica gel waterproof layer II 7.
In this application, fire resistant mica tape of fire resistant mica layer one 4 sticiss silica gel waterproof layer two 7 on outside waterproof jacket 5, when silica gel waterproof layer two 7 takes place the tiny damage, can make the damaged department of silica gel waterproof layer two 7 receive the extrusion and increase the contact pressure between the damaged face under pressure and prevent the infiltration entering through the pressure of fire resistant mica layer one 4 for silica gel waterproof layer two 7 also can have better waterproof nature when there is tiny damage.
A plurality of internal tensile wires 8 are arranged in the silica gel waterproof layer II 7, the internal tensile wires 8 are arranged in parallel to the length extending direction of the core wire, and the internal tensile wires 8 are uniformly distributed between the external waterproof sleeve 5 and the first fire-resistant mica layer 4 in an annular shape.
In this application, inside tensile wire 8 has improved fire-resistant low tension cable's whole tensile, prevents that fire-resistant low tension cable from pulling back heart yearn and taking place disconnected silk or fracture.
The internal stranded wire comprises a plurality of internal copper wires 1, the internal stranded wire is stranded into a wire harness by the internal copper wires 1, and the surface of the internal copper wires 1 is wrapped by a silica gel cladding 10.
In this application, inside stranded conductor is formed by the transposition of inside copper wire 1, and inside copper wire 1 silica gel covering 10 of parcel has improved single inside copper wire 1's waterproof nature on the surface, and then has improved whole fire-resistant low tension cable's waterproof nature.
Be provided with a plurality of tensile steel wires 11 in the inside stranded conductor, tensile steel wire 11 and the transposition of inside copper wire 1 are inside stranded conductor, and tensile steel wire 11 evenly distributed is inside stranded conductor.
In this application, tensile steel wire 11 in the inside stranded conductor has improved the pull resistance of single inside stranded conductor, prevents that inside stranded conductor from receiving the condition that takes place inside copper wire 1 disconnected silk behind the pulling force.
A second fire-resistant mica layer 12 is arranged between the flame-retardant polyvinyl fluoride insulating sheath 2 and the first fire-resistant mica layer 4, the second fire-resistant mica layer 12 is formed by wrapping a fire-resistant mica tape on the surface of the first fire-resistant mica layer 4, and a copper tape of the profiled steel sheath 3 is wrapped on the surface of the second fire-resistant mica layer 12.
In the application, the second fire-resistant mica layer 12 is arranged, so that the overall fire resistance of the fire-resistant low-voltage cable is improved.
An outer buffer layer 13 is arranged between the second fire-resistant mica layer 12 and the first fire-resistant mica layer 4, and the fire-resistant mica tape of the second fire-resistant mica layer 12 is in pressing contact with the surface of the outer buffer layer 13.
In this application, the outer buffer layer 13 between the second fire resistant mica layer 12 and the first fire resistant mica layer 4 is silica gel, and the second fire resistant mica layer 12 and the first fire resistant mica layer 4 are kept apart to outer buffer layer 13, prevent to take place the friction between the second fire resistant mica layer 12 and the first fire resistant mica layer 4. And when the external buffer layer 13 is damaged finely, the pressure of the second fire-resistant mica layer 12 can extrude the damaged part of the external buffer layer 13 and increase the contact pressure between the damaged surfaces under the pressure to prevent water seepage, so that the external buffer layer 13 can have good waterproofness when the external buffer layer 13 is damaged finely.
Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art should also understand that the changes, modifications, additions or substitutions made within the scope of the present invention should belong to the protection scope of the present invention.
Claims (8)
1. A fire-resistant low voltage cable characterized by: comprises a core wire and a core wire outer cladding, wherein the core wire outer cladding is wrapped on the surface of the core wire; the core wire comprises a plurality of internal stranded wires, the core wire is stranded into a wire bundle through the internal stranded wires, and the surface of the core wire is wrapped with an external waterproof sleeve (5); the core wire outer cladding comprises a flame-retardant polyvinyl fluoride insulating sheath (2), a profiled steel sheath (3) and a fire-resistant mica layer I (4); the first fireproof mica layer (4) is wrapped on the outer waterproof sleeve (5), and the first fireproof mica layer (4) is formed by wrapping a fireproof mica tape on the surface of the outer waterproof sleeve (5); the profiled steel sheath (3) comprises a plurality of copper strips, and the copper strips are wound on the first refractory mica layer (4) along the length extension direction of the core wire and are fixed through extrusion deformation; the flame-retardant polyvinyl fluoride insulating sheath (2) is wrapped on the surface of the profiled steel sheath (3); the surface of the internal stranded wire is wrapped with an internal waterproof sleeve (51), and a silica gel buffer layer (6) is filled between the external waterproof sleeve (5) and the external surface of the internal waterproof sleeve (51).
2. Fire-resistant low-voltage cable according to claim 1, characterized in that: the silica gel buffer layer (6) is filled between two adjacent internal stranded wires, and the silica gel buffer layer (6) between the outer surfaces of the external waterproof sleeve (5) and the internal waterproof sleeve (51) and the buffer layer between the two adjacent internal stranded wires are formed by pre-dipping foamed silica gel after core wires are twisted.
3. Fire-resistant low-voltage cable according to claim 1, characterized in that: be provided with silica gel waterproof layer two (7) between outside waterproof jacket (5) and fire resistant mica layer (4), silica gel waterproof layer two (7) wrap up on outside waterproof jacket (5), the fire resistant mica tape and the silica gel waterproof layer two (7) surface sticiss the contact of fire resistant mica layer (4).
4. Fire-resistant low-voltage cable according to claim 3, characterized in that: be provided with a plurality of inside tensile wires (8) in silica gel waterproof layer two (7), inside tensile wire (8) are on a parallel with the length extending direction setting of heart yearn, and inside tensile wire (8) are the even distribution of annular between outside waterproof cover (5) and fire-resistant mica layer (4).
5. Fire-resistant low-voltage cable according to claim 1, characterized in that: the internal stranded wire comprises a plurality of internal copper wires (1), the internal stranded wire is stranded into a wire harness by the internal copper wires (1), and the surface of the internal copper wires (1) is wrapped with a silica gel coating (10).
6. Fire-resistant low-voltage cable according to claim 5, characterized in that: a plurality of tensile steel wires (11) are arranged in the internal stranded wire, the tensile steel wires (11) are stranded with the internal copper wire (1) to form the internal stranded wire, and the tensile steel wires (11) are uniformly distributed in the internal stranded wire.
7. Fire-resistant low-voltage cable according to claim 1, characterized in that: a second fire-resistant mica layer (12) is arranged between the flame-retardant polyvinyl fluoride insulating sheath (2) and the first fire-resistant mica layer (4), the second fire-resistant mica layer (12) is formed by wrapping a fire-resistant mica tape on the surface of the first fire-resistant mica layer (4), and a copper tape of the profiled steel sheath (3) is wrapped on the surface of the second fire-resistant mica layer (12).
8. Fire-resistant low-voltage cable according to claim 7, characterized in that: an external buffer layer (13) is arranged between the second fire-resistant mica layer (12) and the first fire-resistant mica layer (4), and a fire-resistant mica tape of the second fire-resistant mica layer (12) is in pressing contact with the surface of the external buffer layer (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023091403.1U CN213905000U (en) | 2020-12-21 | 2020-12-21 | Fire-resistant low-voltage cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023091403.1U CN213905000U (en) | 2020-12-21 | 2020-12-21 | Fire-resistant low-voltage cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213905000U true CN213905000U (en) | 2021-08-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023091403.1U Active CN213905000U (en) | 2020-12-21 | 2020-12-21 | Fire-resistant low-voltage cable |
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| Country | Link |
|---|---|
| CN (1) | CN213905000U (en) |
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2020
- 2020-12-21 CN CN202023091403.1U patent/CN213905000U/en active Active
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