CN213519336U - Flexible mineral insulated cable - Google Patents
Flexible mineral insulated cable Download PDFInfo
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- CN213519336U CN213519336U CN202021342022.3U CN202021342022U CN213519336U CN 213519336 U CN213519336 U CN 213519336U CN 202021342022 U CN202021342022 U CN 202021342022U CN 213519336 U CN213519336 U CN 213519336U
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Abstract
The utility model discloses a flexible mineral insulated cable, belonging to the technical field of cables, comprising a cable core, an outer sheath and a mineral insulating layer; the inner side of the mineral insulating layer is provided with a heat insulating layer, the inner side of the heat insulating layer is provided with an elastic layer positioned on the outer side of the cable core, the heat insulating layer comprises at least two single bodies with arc-shaped sections which are distributed at equal intervals along the peripheral side of the elastic layer, and a staggered clamping structure is formed between the opposite sides of every two adjacent single bodies through notches and protrusions; a flame-retardant layer is arranged between the mineral insulating layer and the outer sheath, a gap is reserved between the flame-retardant layer and the mineral insulating layer to form a first cavity, and a gap is reserved between the flame-retardant layer and the outer sheath to form a second cavity. The utility model discloses flame retardant property is good, can realize the high-efficient protection to the cable core, and the flexibility is good, and when the cable is crooked, bending radius is less, to the less space of the structure requirement of building, and it is comparatively convenient to the construction of laying of cable, is difficult for causing cable fracture, and the application security is higher.
Description
Technical Field
The utility model relates to the technical field of cables, specificly relate to a flexible mineral insulated cable.
Background
The mineral insulated cable is a cable which uses a copper sheath to wrap a copper conductor core wire and uses magnesium oxide powder as an inorganic insulating material to isolate the conductor and the sheath, and the outermost layer can select a proper protective sleeve as required, and is commonly called MICC or MI cable. The cable is made of inorganic materials, so that the cable has the characteristics of fire resistance, water resistance, explosion resistance, corrosion resistance and the like, and an aluminum (copper) sheath mineral insulated cable is generally adopted in a fire-proof structure, a layer of circular aluminum (copper) sheath pipe is mainly extruded outside a cable core, and mineral insulation is extruded inside the cable core.
SUMMERY OF THE UTILITY MODEL
1. Technical problem to be solved
The to-be-solved technical problem of the utility model is to provide a flexible mineral insulated cable, its fire behaviour is good, can realize the high-efficient protection to the cable core, and flexible good, when the cable is crooked, and bending radius is less, to the less space of the structural requirement of building, and it is comparatively convenient to the construction of laying of cable, is difficult for causing the cable fracture, and the application security is higher.
2. Technical scheme
In order to solve the above problem, the utility model adopts the following technical scheme:
a flexible mineral insulated cable comprises a cable core, an outer sheath positioned on the surface side of the cable and a mineral insulating layer arranged between the cable core and the outer sheath, wherein the cable core comprises at least two wire cores, and a wire core protective layer is coated on the outer side of each wire core; the cable comprises a cable core, a mineral insulating layer, a cable core and a cable body, wherein the inner side of the mineral insulating layer is provided with a heat insulating layer, the inner side of the heat insulating layer is provided with an elastic layer positioned outside the cable core, the sections of the elastic layer and the mineral insulating layer are both annular, the heat insulating layer comprises at least two single bodies with arc-shaped sections distributed at equal intervals along the peripheral side of the elastic layer, opposite sides between every two adjacent single bodies are respectively provided with notches at equal intervals, a protruding part is formed between every two adjacent notches on the same side surface, and the protruding part on one side of each single body is in adaptive alignment with the corresponding; a flame-retardant layer is arranged between the mineral insulating layer and the outer sheath, a gap is reserved between the flame-retardant layer and the mineral insulating layer to form a first cavity, and a gap is reserved between the flame-retardant layer and the outer sheath to form a second cavity.
Further, the cable core includes the cladding in the covering around all sinle silk outsides, the outline around the covering is circular, the outside cladding formula around the covering is equipped with the metal armor layer. The arrangement of the wrapping layer can adapt to wire cores in different arrangement modes, and the outer contour of the wrapping layer is circular, so that the arrangement of the outer side structure of the wrapping layer is facilitated; the metal armor layer can adopt a non-magnetic stainless steel strip interlocking armor structure, has excellent mechanical, compression-resistant, antimagnetic, fireproof, flexible and other performances, and also has the effects of theft prevention, insect bite prevention and the like.
Furthermore, a gap between the outer side of the wire core and the inner side of the wrapping layer is filled with a flame-retardant filler. The filler can enhance the flame-retardant protection function of the wire core and can prevent externally applied pressure from acting on the wire core to a certain extent.
Furthermore, a plurality of annular first rubber layers are fixed on the inner side surface of the elastic layer at equal intervals along the length direction of the elastic layer, the inner side surface of each first rubber layer is attached to the outer side surface of the metal armor layer, and a cavity is formed between every two adjacent first rubber layers. First rubber layer has elasticity, can be by compression deformation, also can reset, and the cavity space of cable inside can be increased to the cavity of formation, can provide sufficient space for the deformation of cable entity structure to can promote the softness characteristic of cable.
Furthermore, a plurality of annular second rubber layers are fixed on the outer side surface of the elastic layer at equal intervals along the length direction of the elastic layer, the outer side surface of each second rubber layer is attached to the inner side surface of the heat insulation layer, and a cavity is formed between every two adjacent second rubber layers. The second rubber layer has elasticity, can be compressed and deformed and can also be reset, and the formed cavity can increase the cavity space in the cable, namely, enough space can be provided for the deformation of the solid structure of the cable, so that the flexibility of the cable can be improved; meanwhile, the second rubber layer is in contact with the heat insulation layer instead of the elastic layer, so that the contact area with the heat insulation layer can be obviously reduced, and the movement of the single body of the heat insulation layer is facilitated.
Further, a nylon layer is adhered to the outer side face of each single body of the heat insulation layer. The nylon has a small friction coefficient, so that the friction between the heat insulation layer and the mineral insulation layer can be reduced, and the movement of the single body of the heat insulation layer can be promoted.
Further, a third rubber layer spirally wound along the length direction of the mineral insulating layer is arranged in the first cavity, and the outer side surface of the third rubber layer is attached to the inner side surface of the flame-retardant layer; and a fourth rubber layer spirally wound along the length direction of the flame-retardant layer is arranged in the second cavity, and the outer side surface of the fourth rubber layer is attached to the inner side surface of the outer sheath. Adopt spiral winding's mode can be comparatively convenient equipment third rubber layer and fourth rubber layer, with the winding of third rubber layer back on the mineral insulation layer, the fire-retardant layer of cladding again forms the first cavity that extends along clearance between the third rubber layer pitch promptly, and the formation of its comparatively convenient realization first cavity, and the formation of the second cavity can comparatively convenient realization through the fourth rubber layer in the same way.
3. Advantageous effects
(1) The utility model is provided with the outer sheath made of halogen-free low-smoke material, when fire disaster occurs, the outer sheath is burnt without generating toxic smoke, so that fire fighters can easily enter the site and the fire fighters are not fumigated due to the toxic smoke; the flame-retardant layer is arranged, so that the flame-retardant effect can be exerted preliminarily; the mineral insulating layer is arranged, and the mineral insulating layer can expand and harden when being burnt by flame, so that the flame blocking effect can be effectively played; the heat insulation layer is arranged on the inner side of the mineral insulation layer and can further prevent heat from being transmitted to the cable core, the heat insulation layer comprises at least two single bodies which are arranged at equal intervals along the peripheral side of the elastic layer, a staggered clamping structure is formed between the opposite sides of every two adjacent single bodies through a notch and a protruding part, and a gap is reserved between every two adjacent single bodies in an initial state, so that the solid structure on the outer side of the single bodies can contract inwards to the gap, and the flexibility of the cable is facilitated; in the process that the mineral insulating layer meets fire, the diameter of the inner side surface of the mineral insulating layer is reduced, so that the heat insulating layer is extruded and contracted, the convex part on each monomer is inserted into the corresponding notch of the monomer on the adjacent side, the diameter of the inner side surface of the heat insulating layer is reduced, and the heat insulating layer is tightly coated on the outer side of the cable core, so that a better heat insulating protection effect can be exerted; the inboard of insulating layer is equipped with the elastic layer, and the elastic layer can cushion the pressure that contracts in the insulating layer to the inboard transmission of cable to can avoid the cable core pressurized, realize the high-efficient protection to the cable core.
(2) In the utility model, a gap is left between the flame-retardant layer and the outer sheath to form a second cavity, so that the outer sheath can contract inwards; a gap is reserved between the mineral insulating layer and the flame-retardant layer to form a first cavity, so that the flame-retardant layer can contract inwards; gaps exist among the monomers of the heat insulation layer in an initial state, so that the mineral insulation layer can retract inwards; elastic layer can be by compression deformation for the insulating layer can contract in can, when the cable needs to be crooked, because the existence of elastic layer, second cavity, third cavity for cable core outside entity structure has sufficient space that contracts in, then the cable has better compliance, when the cable is crooked, the bend radius of cable is less, to the less space of structural requirement of building, it is comparatively convenient to the construction of laying of cable, be difficult for causing the cable fracture, and the safety in utilization is higher.
To sum up, the utility model discloses flame retardant property is good, can realize the high-efficient protection to the cable core, and flexible good, and when the cable was crooked, bending radius was less, to the less space of the structure requirement of building, it is comparatively convenient to the construction of laying of cable, is difficult for causing the cable fracture, and the application security is higher.
Drawings
Fig. 1 is a schematic cross-sectional structure of the present invention;
fig. 2 is a schematic view of one side of the insulation layer 4;
FIG. 3 is a schematic view of the installation arrangement of the second rubber layer 12;
fig. 4 is a schematic view of the installation arrangement of the third rubber layer 15.
Reference numerals: 1. an outer sheath; 2. a flame retardant layer; 3. a mineral insulation layer; 4. a thermal insulation layer; 5. An elastic layer; 6. a metal armor layer; 7. wrapping a covering; 8. a wire core; 9. a wire core protective layer; 10. A flame retardant filler; 11. a first rubber layer; 12. a second rubber layer; 13. a nylon layer; 14. A notch; 15. a third rubber layer; 16. a fourth rubber layer; 17. a first cavity; 18. a second cavity; 19. a projection.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1
The flexible mineral insulated cable shown in fig. 1 comprises a cable core, an outer sheath 1 positioned on the surface side of the cable and a mineral insulating layer 3 arranged between the cable core and the outer sheath 1, wherein the outer sheath 1 is made of a halogen-free low-smoke material, and the mineral insulating layer 3 is formed by mixing graphite and quartz, so that the mineral insulating layer can expand and harden when encountering flame combustion to play a role in blocking flame; the cable core comprises at least two wire cores 8 (three wire cores 8 are shown in the figure), a wire core protective layer 9 is coated on the outer side of each wire core 8, and each wire core protective layer 9 comprises an insulating layer and a shielding layer; the inner side of the mineral insulating layer 3 is provided with a heat insulating layer 4, the heat insulating layer 4 is made of heat insulating cotton, the inner side of the heat insulating layer 4 is provided with an elastic layer 5 positioned on the outer side of the cable core, the elastic layer 5 is made of inorganic synthetic fiber rubber, the inorganic synthetic fiber rubber is firstly used as an inorganic material and is suitable for mineral insulating cables, and the inorganic synthetic fiber rubber has excellent creep property and good torque positioning effect and meets the design requirements. The sections of the elastic layer 5 and the mineral insulating layer 3 are both annular, the heat insulation layer 4 comprises at least two single bodies (eight single bodies are shown in the figure) with arc-shaped sections, the single bodies are arranged along the outer periphery of the elastic layer 5 at equal intervals, notches 14 are respectively arranged on opposite sides between every two adjacent single bodies at equal intervals, as shown in fig. 2, a protruding part 19 is formed between every two adjacent notches 14 on the same side face, and the protruding part 19 on one side of each single body is in adaptive alignment with the corresponding side notches 14 of the single bodies on the adjacent side; the cable is characterized in that a flame-retardant layer 2 is arranged between the mineral insulating layer 3 and the outer sheath 1, the flame-retardant layer 2 is made of high-bulkiness glass fibers, the flexibility of the cable can be improved while the flame-retardant layer has flame-retardant performance, a gap is reserved between the flame-retardant layer 2 and the mineral insulating layer 3 to form a first cavity 17, and a gap is reserved between the flame-retardant layer 2 and the outer sheath 1 to form a second cavity 18.
Example 2
The present embodiment is different from embodiment 1 in that:
in this embodiment, as shown in fig. 1 and 3, a plurality of annular second rubber layers 12 are fixed on the outer side surface of the elastic layer 5 at equal intervals along the length direction, the outer side surface of each second rubber layer 12 is attached to the inner side surface of the heat insulation layer 4, and a cavity is formed between every two adjacent second rubber layers 12. The second rubber layer 12 has elasticity, can be compressed and deformed and can also be reset, and a formed cavity can increase the cavity space in the cable, namely, enough space can be provided for the deformation of the solid structure of the cable, so that the flexibility of the cable can be improved; meanwhile, the second rubber layer 12 is in contact with the heat insulation layer 4 instead of the elastic layer 5, so that the contact area with the heat insulation layer 4 can be obviously reduced, and the movement of the monomer of the heat insulation layer 4 is facilitated.
In this embodiment, as shown in fig. 1, a nylon layer 13 is adhered to the outer side surface of each single body of the thermal insulation layer 4. The nylon has a low friction coefficient, and can reduce the friction between the thermal insulation layer 4 and the mineral insulation layer 3, thereby facilitating the movement of the single body of the thermal insulation layer 4.
In this embodiment, as shown in fig. 1 and 4, a third rubber layer 15 spirally wound along the length direction of the mineral insulation layer 3 is arranged in the first cavity 17, and the outer side surface of the third rubber layer 15 is attached to the inner side surface of the flame retardant layer 2; a fourth rubber layer 16 spirally wound along the length direction of the flame-retardant layer 2 is arranged in the second cavity 18, and the outer side surface of the fourth rubber layer 16 is attached to the inner side surface of the outer sheath 1. Adopt spiral winding's mode can be comparatively convenient equipment third rubber layer 15 and fourth rubber layer 16, twine third rubber layer 15 back on mineral insulation layer 3, again cladding flame retardant coating 2, form the first cavity 17 that extends along the clearance between the 15 pitch of third rubber layer promptly, its formation of the first cavity 17 of comparatively convenient realization, the formation of second cavity 18 can comparatively convenient realization through fourth rubber layer 16 in the same way.
Otherwise, the same procedure as in example 1 was repeated.
Example 3
The present embodiment is different from embodiment 2 in that:
in this embodiment, as shown in fig. 1, the cable core includes a wrapping layer 7 covering the outside of all the cable cores 8, the outer contour of the wrapping layer 7 is circular, and a metal armor layer 6 is arranged on the outside of the wrapping layer 7 in a wrapping manner. The arrangement of the wrapping layer 7 can be suitable for the wire cores 8 in different arrangement modes, and the outer contour of the wrapping layer 7 is circular, so that the arrangement of the outer side structure of the wrapping layer is convenient; the metal armor layer 6 can adopt a non-magnetic stainless steel strip interlocking armor structure, has excellent mechanical, compression-resistant, antimagnetic, fireproof, flexible and other performances, and also has the effects of theft prevention, insect bite prevention and the like.
In this embodiment, as shown in fig. 1, the gap between the outside of the wire core 8 and the inside of the wrapping 7 is filled with a flame retardant filler 10. The presence of the filler enhances the flame-retardant protective function of the wire core 8 and prevents externally applied pressure from acting on the wire core 8 to a certain extent.
In this embodiment, as shown in fig. 1, a plurality of annular first rubber layers 11 are fixed on the inner side surface of the elastic layer 5 at equal intervals along the length direction thereof, the inner side surface of each first rubber layer 11 is attached to the outer side surface of the metal armor layer 6, and a cavity is formed between every two adjacent first rubber layers 11. The first rubber layer 11 has elasticity, can be compressed and deformed, also can reset, and the cavity space inside the cable can be increased to the cavity of formation, can provide sufficient space for the deformation of cable entity structure to can promote the soft characteristic of cable.
The first rubber layer 11, the second rubber layer 12, the third rubber layer 15 and the fourth rubber layer 16 are made of inorganic synthetic fiber rubber, the inorganic synthetic fiber rubber is firstly used as an inorganic material and is suitable for mineral insulated cables, and the inorganic synthetic fiber rubber has excellent creep property and good torque positioning effect and meets design requirements.
The rest is the same as example 2.
The specific action principle of the flexible mineral insulated cable is as follows:
when the cable is used, firstly, the construction requirement of the installation cover is required for laying and installation, when the cable needs to be bent, the outer sheath 1 can retract due to the existence of the first cavity 17 (the third rubber layer 15), the flame-retardant layer 2 can retract due to the existence of the second cavity 18 (the fourth rubber layer 16), the heat-insulating layer 4 can retract due to the fact that the opposite sides of every two adjacent monomers on the heat-insulating layer 4 form a staggered clamping structure through the notch 14 and the bulge 19, in addition, a gap is reserved between every two adjacent monomers in an initial state, the mineral insulating layer 3 can retract, the heat-insulating layer 4 can retract due to the existence of the elastic layer 5 and the second rubber layer 12, the solid structure on the outer side of the cable core can retract due to the existence of the first rubber layer 11, the cable has better flexibility, when the cable is bent, the bending radius of the cable is smaller, the requirement on the structure of a building is smaller, the cable laying construction is convenient, the cable is not easy to crack, and the application safety is high.
When a fire disaster happens, the outer sheath 1 is burnt without generating toxic smoke, so that fire fighters can easily enter the site and cannot be fumigated due to the toxic smoke; the flame-retardant layer 2 can initially play a flame-retardant role, and after the flame-retardant layer 2 is damaged, the mineral insulating layer 3 can expand and harden when being burnt by flame, so that the flame-retardant function is played; in the expansion process of the mineral insulating layer 3, the diameter of the inner side surface of the mineral insulating layer is reduced, so that the heat insulating layer 4 is extruded and retracted, the convex part 19 on each monomer is inserted into the corresponding notch 14 of the monomer on the adjacent side, the diameter of the inner side surface of the heat insulating layer 4 is reduced, and the heat insulating layer is tightly coated on the outer side of the elastic layer 5, so that a better protection effect can be exerted, and the second rubber layer 12, the elastic layer 5 and the first rubber layer 11 can buffer the pressure transmitted from the inner side of the heat insulating layer 4 to the inner side of the cable, so that the compression of the cable core can be avoided, and the high; in addition, the metal armor layer 6 and the flame-retardant filler 10 can both exert certain flame-retardant performance, and can strengthen the flame-retardant protection on the wire core.
According to the above, the utility model discloses flame retardant property is good, can realize the high-efficient protection to the cable core, and flexible good, and when the cable was crooked, bending radius was less, to the less space of the structural requirement of building, and it is comparatively convenient to lay the construction of cable, is difficult for causing the cable fracture, and the application security is higher.
It will be appreciated by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as limitations of the present invention, and that changes and modifications to the above described embodiments will fall within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (7)
1. A flexible mineral insulated cable comprises a cable core, an outer sheath (1) positioned on the surface side of the cable and a mineral insulating layer (3) arranged between the cable core and the outer sheath (1), wherein the cable core comprises at least two wire cores (8), and a wire core protective layer (9) is coated on the outer side of each wire core (8); the cable is characterized in that a heat insulation layer (4) is arranged on the inner side of the mineral insulation layer (3), an elastic layer (5) located on the outer side of the cable core is arranged on the inner side of the heat insulation layer (4), the sections of the elastic layer (5) and the mineral insulation layer (3) are both annular, the heat insulation layer (4) comprises at least two single bodies, the sections of the single bodies are arc-shaped, the opposite sides of every two adjacent single bodies are respectively provided with notches (14) at equal intervals, a protruding part (19) is formed between every two adjacent notches (14) on the same side, and the protruding part (19) on one side of each single body is in adaptive alignment with the corresponding side notches (14) of the adjacent single body; a flame-retardant layer (2) is arranged between the mineral insulating layer (3) and the outer sheath (1), a gap is reserved between the flame-retardant layer (2) and the mineral insulating layer (3) to form a first cavity (17), and a gap is reserved between the flame-retardant layer (2) and the outer sheath (1) to form a second cavity (18).
2. The flexible mineral insulated cable according to claim 1, characterized in that the cable core comprises a wrapping layer (7) covering the outside of all the cable cores (8), the outer contour of the wrapping layer (7) is circular, and a metal armor layer (6) is covered on the outside of the wrapping layer (7).
3. A flexible mineral-insulated cable according to claim 2, characterized in that the gap between the outside of the core (8) and the inside of the wrapping (7) is filled with a flame retardant filler (10).
4. A flexible mineral-insulated cable according to claim 2, characterized in that a plurality of annular first rubber layers (11) are fixed on the inner side of the elastic layer (5) at equal intervals along the length direction, the inner side of the first rubber layer (11) is attached to the outer side of the metal armor layer (6), and a cavity is formed between every two adjacent first rubber layers (11).
5. A flexible mineral-insulated cable according to claim 1, characterized in that the outer side of the elastic layer (5) is fixed with a plurality of second rubber layers (12) in ring shape along the length direction at equal intervals, and the outer side of the second rubber layers (12) is attached to the inner side of the thermal insulation layer (4), and a cavity is formed between every two adjacent second rubber layers (12).
6. A flexible mineral-insulated cable according to claim 1, characterized in that a nylon layer (13) is adhered to the outer side of each individual body of the insulation layer (4).
7. A flexible mineral-insulated cable according to claim 1, characterized in that a third rubber layer (15) is arranged in the first cavity (17) and spirally wound along the length direction of the mineral-insulated layer (3), and the outer side of the third rubber layer (15) is attached to the inner side of the flame-retardant layer (2); a fourth rubber layer (16) spirally wound along the length direction of the flame-retardant layer (2) is arranged in the second cavity (18), and the outer side surface of the fourth rubber layer (16) is attached to the inner side surface of the outer sheath (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021342022.3U CN213519336U (en) | 2020-07-08 | 2020-07-08 | Flexible mineral insulated cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021342022.3U CN213519336U (en) | 2020-07-08 | 2020-07-08 | Flexible mineral insulated cable |
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| CN213519336U true CN213519336U (en) | 2021-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021342022.3U Active CN213519336U (en) | 2020-07-08 | 2020-07-08 | Flexible mineral insulated cable |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023213063A1 (en) * | 2022-05-05 | 2023-11-09 | 安徽华海特种电缆集团有限公司 | High-temperature flexible towing cable |
-
2020
- 2020-07-08 CN CN202021342022.3U patent/CN213519336U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023213063A1 (en) * | 2022-05-05 | 2023-11-09 | 安徽华海特种电缆集团有限公司 | High-temperature flexible towing cable |
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