CN217426391U - Flexible mineral insulation prefabricated branch fireproof cable - Google Patents
Flexible mineral insulation prefabricated branch fireproof cable Download PDFInfo
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- CN217426391U CN217426391U CN202221170768.XU CN202221170768U CN217426391U CN 217426391 U CN217426391 U CN 217426391U CN 202221170768 U CN202221170768 U CN 202221170768U CN 217426391 U CN217426391 U CN 217426391U
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Abstract
The utility model relates to the technical field of cables, particularly, relate to prefabricated branch fireproof cable of flexible mineral insulation, include: a main insulated wire core having a section of exposed portion; the bare wire part at the end part of the branch insulated wire core is attached to the bare wire part of the main insulated wire core; the C-shaped buckle is clamped to the exposed part of the main insulated wire core and the exposed part of the branch insulated wire core, so that the main insulated wire core and the branch insulated wire core are relatively fixed; the utility model discloses different use C types of connection at the connection of thread cable and branch cable are detained and are connected, and metal shrapnel through laminating bare wire distribution increases the area of contact between the bare wire, reduces contact resistance, reduces generating heat at connection position, adds the mineral filling layer in coupling part's the outside and is wrapped the package by the auro mica tape, through the heat-proof quality in the incombustible characteristic of mineral filling layer and auro mica tape, forms the fire-retardant structure who surrounds at the cable junction, can improve the fire behavior of branch structure in advance.
Description
Technical Field
The utility model relates to the technical field of cables, particularly, relate to flexible mineral insulation prefabricated branch fireproof cable.
Background
The pre-branch cable requires a factory to design and prepare the pre-branch line according to a user design drawing when producing the main cable. The branch line is manufactured on the main cable in advance by a factory, the section size of the branch line, the length of the branch line and the like are determined according to design requirements, the construction period is greatly shortened, the material cost and the construction cost are greatly reduced, and the safety and the reliability of power distribution are greatly ensured.
The joints of the pre-branch cables are usually connected by C-shaped buckles, and an insulating material is formed by injection molding on the outside, and the joints of the cables have potential safety hazards due to the fact that the electric contact area of the connecting parts of the connecting buckles is relatively small and the fireproof performance of the insulating material is insufficient.
SUMMERY OF THE UTILITY MODEL
Defect and not enough to branch cable among the prior art in advance, the utility model aims to provide an, improve cable coupling part's area of contact, reduce contact resistance to improve the fire-retardant ability of connecting the position.
The utility model provides a prefabricated branch fireproof cable of flexible mineral insulation, include:
a main insulated wire core having a section of exposed portion;
the bare wire part at the end part of the branch insulated wire core is attached to the bare wire part of the main insulated wire core;
the C-shaped buckle is clamped to the exposed part of the main insulated wire core and the exposed part of the branch insulated wire core, so that the main insulated wire core and the branch insulated wire core are relatively fixed;
the golden mica tape is wrapped on the C-shaped buckle, the exposed part of the main insulated wire core and the outer wall of the exposed part of the branch insulated wire core;
the sheath is coated on the outer walls of the main insulated wire core, the branch insulated wire core and the auromite tape;
and a mineral filling layer is arranged among the phlogopite strip, the exposed part of the main insulated wire core and the exposed part of the branch insulated wire core.
Preferably, the C-shaped buckle comprises an inner-layer buckle sleeve, an outer-layer buckle sleeve and a constraint ring, the inner-layer buckle sleeve is buckled on the exposed part of the main insulated wire core and the exposed part of the branch insulated wire core, the outer-layer buckle sleeve is buckled on the outer wall of the inner-layer buckle sleeve, and the constraint ring is sleeved on the outer wall of the outer-layer buckle sleeve.
Preferably, the inlayer is detained the cover and is included polyethylene layer, foaming layer and metal bullet piece layer, the inboard formation of metal bullet piece layer holds the exposed portion of main insulation sinle silk and the centre gripping groove of the bare wire part of branch insulation sinle silk make the metal bullet piece layer with the exposed portion of main insulation sinle silk and the bare wire part contact of branch insulation sinle silk.
Preferably, the foamed layer has a porous structure, such as a circular pore structure, formed therein, and the pore diameter thereof varies with the thickness of the foamed layer.
Preferably, the lapping rate of the phlogopite tape is 30-40%.
Preferably, the lapping layers of the phlogopite tapes are 3-5.
Preferably, the sheath comprises a magnesium hydroxide mineral fire-proof sheath or a low smoke zero halogen sheath.
Compared with the prior art, the utility model has the advantages of:
the utility model discloses different use C types of connection at thread cable and branch cable detain the connection, the metal shrapnel that distributes through the naked line of laminating increases the area of contact between the naked line, reduces contact resistance, reduces generating heat at connection position, adds the mineral filling layer in coupling part's the outside and is wrapped the package by the auro mica tape, through the heat-proof quality in the incombustible characteristic of mineral filling layer and auro mica tape, forms the fire-retardant structure who surrounds at the cable junction, improves the fire behaviour of branch structure in advance.
Drawings
The figures are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural view of the flexible mineral insulation prefabricated branch fireproof cable of the present invention;
fig. 2 is a schematic structural view of the C-shaped buckle of the present invention.
Detailed Description
For a better understanding of the technical aspects of the present invention, specific embodiments are described below in conjunction with the appended drawings.
Prefabricated branch cable sets up the lead-out wire part at distribution equipment usually, and the parallel a plurality of arranging, and the connection structure of branch cable in advance is owing to rely on the joint of branch sinle silk and thread core, and the contact surface is little, under the special load condition, appears the big condition of contact point calorific capacity easily, has the potential safety hazard, consequently, the utility model provides a flexible mineral insulation prefabricated branch fireproof cable aims at improving the area of contact of branch line and the thread of junction, improves the fire resistance of connecting bare wire department.
As shown in fig. 1, the flexible mineral insulation prefabricated branch fireproof cable mainly comprises a main insulation wire core 1, a branch insulation wire core 3, a C-shaped buckle 4, a mineral filling layer 5, a phlogopite tape 6 and a sheath 7, wherein the main insulation wire core 1 is provided with a section of exposed part 2, the exposed part 2 is a bare wire with insulation removed from the main insulation wire core 1, the end part of the branch insulation wire core 3 is a bare wire part 31, and the main insulation wire core 1 and the branch insulation wire core 3 are electrically connected through contact of the exposed part 2 and the bare wire part 31.
In an optional embodiment, the main insulated wire core 1 and the branch insulated wire cores 3 comprise stranded copper wire cores, mica tapes wrapped on the outer walls of the stranded copper wire cores, radiation cross-linked polyethylene waterproof layers wrapped on the outer walls of the mica tapes, and low smoke zero halogen sheaths. The main insulated wire core 1 is formed by stranding 10 copper stranded wires with the monofilament diameter of 2.58mm, and the branch insulated wire core 3 is formed by stranding 7 copper stranded wires with the monofilament diameter of 1.35 mm.
Furthermore, the bare part 31 of the end part is attached to the bare part 2 of the main insulated wire core 1, and the C-shaped buckle 4 is clamped to the bare part 2 of the main insulated wire core 1 and the bare part 31 of the branch insulated wire core 3, so that the main insulated wire core 1 and the branch insulated wire core 3 are relatively fixed.
Referring to fig. 2, the C-shaped buckle 4 includes an inner buckle sleeve 41, an outer buckle sleeve 42 and a restraining ring 43, the inner buckle sleeve 41 is buckled on the exposed portion 2 of the main insulated wire core 1 and the exposed portion 31 of the branch insulated wire core 3, the outer buckle sleeve 42 is buckled on the outer wall of the inner buckle sleeve 41, and the restraining ring 43 is sleeved on the outer wall of the outer buckle sleeve 42.
Wherein, the inner layer buckles 41 and the outer layer buckles 42 are C-shaped in the axial section of the cable, and both have an opening end, through the deformation capacity of itself, the opening end slides over the bare wire outer wall and is buckled in place, so, the buckling reliability can be ensured by utilizing the double-layer C-shaped buckle, and the restraint ring 43 is used for limiting.
Specifically, the inner-layer buckle sleeve 41 is buckled to the outer walls of the bare part 31 and the bare part 2 from top to bottom, the opening end of the lower portion of the inner-layer buckle sleeve 41 is larger than the diameter of the bare part 31, the inner-layer buckle sleeve directly expands along the outer wall of the bare part 2 and then contracts until the bare part 31 and the bare part 2 are attached to the outer wall of the bare part, the outer-layer buckle sleeve 42 is reversely buckled to the outer wall of the inner-layer buckle sleeve 41 and limited by the restraining ring 43 sleeved on the outer wall, pre-tightening force is increased, and the bare part 31 and the bare part 2 are firmly pressed together.
Further, the inner layer buckle sleeve 41 comprises a polyethylene layer 411, a foaming layer 412 and a metal elastic sheet layer 413, wherein a clamping groove for accommodating the exposed part 2 of the main insulated wire core 1 and the exposed part 31 of the branch insulated wire core 3 is formed on the inner side of the metal elastic sheet layer 413, so that the metal elastic sheet layer 413 is in contact with the exposed part 2 of the main insulated wire core 1 and the exposed part 31 of the branch insulated wire core 3.
Thus, the inner-layer buckle sleeve 41 has good elasticity and deformation capability, and can be attached to the outer walls of the exposed part 2 and the bare wire part 31, so that the electrical connection capability of the exposed part 2 and the bare wire part 31 is improved, the contact resistance is reduced, and the heat productivity is reduced.
In an alternative embodiment, the metal bullet layer 413 is a 1mm thick copper sheet. The foaming layer can adopt a plastic foaming layer, such as a polypropylene plastic foaming layer or a PVC plastic foaming layer.
Preferably, the foam layer 412 forms a porous structure therein. Thus, when the inner buckle 41 is installed, the inner buckle 41 has better elasticity, and when the mineral filling layer 5 is filled, the inorganic mineral particles can be filled in the porous structure, so that the flame retardancy is improved.
Alternatively, the porous structure of the foam layer 412 is a circular hole structure distributed between the polyethylene layer 411 and the metal elastic sheet layer 413 as shown in fig. 2, and the pore diameter varies with the thickness of the foam layer 412.
As shown in fig. 2, the thickness of the foamed layer 412 tends to vary from small to large in the range from the bare portion 2 of the main insulated wire core 1 to the bare portion 31 of the branch insulated wire core 3.
Furthermore, magnesium oxide powder is filled between the bare part 2 of the main insulated wire core 1 and the bare part 31 of the branch insulated wire core 3, and then the main insulated wire core and the branch insulated wire core are wrapped by a phlogopite tape 6 to form a mineral filling layer 5.
In a specific embodiment, the connecting part of the connected C-shaped buckle 4 passes through the container filled with the magnesium oxide powder, and the aureole belt 6 is wrapped around the outer wall when the connecting part passes out, so that the magnesium oxide powder is densely filled in the connecting part, wherein the wrapping range of the aureole belt 6 is the outer walls of the C-shaped buckle 4, the exposed part 2 of the main insulated wire core 1 and the bare part 31 of the branch insulated wire core 3, and preferably, the aureole belt can extend 1-2cm left and right.
Preferably, the lapping rate of the phlogopite tapes 6 is 30-40%, and the number of the lapping layers of the phlogopite tapes 6 is 3-5. Therefore, the fireproof and flame-retardant performance of the connecting structure can be ensured.
Further, sheath 7 forms injection structure cladding at the outer wall of main insulation sinle silk 1, branch insulation sinle silk 3 and phlogopite tape 6 through airtight mould pressing, and optionally, sheath 7 includes magnesium hydrate mineral fire prevention sheath or low smoke and zero halogen sheath.
The magnesium hydroxide mineral fireproof sheath is a sheath material formed by mixing and extruding magnesium hydroxide powder and PP powder, and the magnesium hydroxide releases bound water when being heated and decomposed, absorbs a large amount of latent heat to reduce the surface temperature of a synthetic material filled with the magnesium hydroxide mineral fireproof sheath in flame, and has the effects of inhibiting polymer decomposition and cooling generated combustible gas.
The low-smoke zero-halogen sheath has the characteristics of low halogen and low smoke, and when a fire disaster happens, the spread speed is slow, the smoke concentration is low, the visibility is high, the release amount of harmful gas is small, and people can evacuate conveniently.
In combination with the above embodiment, the utility model discloses different use C type buckles of connection at thread cable and branch cable are connected, metal shrapnel through laminating bare wire distribution increases the area of contact between the bare wire, reduce contact resistance, reduce the generating heat at connection position, add the mineral filling layer in the outside of coupling part and by the aureola area around the package, the heat-proof quality through the incombustible characteristic of mineral filling layer and aureola area, form and surround the fire-retardant structure at the cable junction, branch structure's fire behavior in advance can be improved, prevent the influence each other between the adjacent cable.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. The present invention is intended to cover by those skilled in the art various modifications and adaptations of the invention without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention is subject to the claims.
Claims (8)
1. The utility model provides a prefabricated branch fireproof cable of flexible mineral insulation which characterized in that includes:
a main insulated wire core (1) having a section of bare portion (2);
the bare part (31) at the end part of the branch insulated wire core (3) is attached to the bare part (2) of the main insulated wire core (1);
the C-shaped buckle (4) is clamped to the exposed part (2) of the main insulated wire core (1) and the exposed part (31) of the branch insulated wire core (3) so as to relatively fix the main insulated wire core (1) and the branch insulated wire core (3);
the aurum mica tape (6) is wrapped on the outer walls of the C-shaped buckle (4), the exposed part (2) of the main insulated wire core (1) and the exposed part (31) of the branch insulated wire core (3);
the sheath (7) is coated on the outer walls of the main insulated wire core (1), the branch insulated wire cores (3) and the phlogopite tape (6);
wherein, a mineral filling layer (5) is arranged among the golden mica tape (6), the bare part (2) of the main insulated wire core (1) and the bare part (31) of the branch insulated wire core (3).
2. The flexible mineral insulated prefabricated branch fireproof cable according to claim 1, wherein the C-shaped buckle (4) comprises an inner buckle sleeve (41), an outer buckle sleeve (42) and a restraining ring (43), the inner buckle sleeve (41) is arranged to buckle the exposed portion (2) of the main insulated wire core (1) and the exposed portion (31) of the branch insulated wire core (3), the outer buckle sleeve (42) is buckled on the outer wall of the inner buckle sleeve (41), and the restraining ring (43) is sleeved on the outer wall of the outer buckle sleeve (42).
3. The flexible mineral insulated prefabricated branch fireproof cable according to claim 2, wherein the inner layer covering (41) comprises a polyethylene layer (411), a foam layer (412) and a metal elastic sheet layer (413), wherein the inner side of the metal elastic sheet layer (413) forms a clamping groove for accommodating the exposed part (2) of the main insulated wire core (1) and the exposed part (31) of the branch insulated wire core (3), and the metal elastic sheet layer (413) is in contact with the exposed part (2) of the main insulated wire core (1) and the exposed part (31) of the branch insulated wire core (3).
4. The flexible mineral-insulated prefabricated branch fireproof cable of claim 3, wherein the foam layer (412) is of a porous structure.
5. The flexible mineral insulated prefabricated branch fireproof cable according to claim 4, wherein the porous structure of the foam layer (412) is a circular hole structure distributed between the polyethylene layer (411) and the metal elastic sheet layer (413), and the hole diameter changes with the thickness of the foam layer (412).
6. The flexible mineral insulated prefabricated branch fireproof cable according to claim 1, wherein the lapping coverage of the phlogopite tape (6) is 30-40%.
7. The flexible mineral insulated prefabricated branch fireproof cable according to claim 1, wherein the number of wrapped layers of the phlogopite tape (6) is 3-5.
8. Flexible mineral-insulated prefabricated branch fireproof cable according to claim 1, wherein the sheath (7) comprises a magnesium hydroxide mineral fireproof sheath or a low smoke zero halogen sheath.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221170768.XU CN217426391U (en) | 2022-05-16 | 2022-05-16 | Flexible mineral insulation prefabricated branch fireproof cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221170768.XU CN217426391U (en) | 2022-05-16 | 2022-05-16 | Flexible mineral insulation prefabricated branch fireproof cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217426391U true CN217426391U (en) | 2022-09-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221170768.XU Active CN217426391U (en) | 2022-05-16 | 2022-05-16 | Flexible mineral insulation prefabricated branch fireproof cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217426391U (en) |
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2022
- 2022-05-16 CN CN202221170768.XU patent/CN217426391U/en active Active
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