CN210837276U - Double-layer insulation irradiation cross-linking halogen-free low-smoke flame-retardant polyolefin sheathed cable - Google Patents

Abstract

The utility model provides a double-deck insulating irradiation crosslinked low smoke flame retardant polyolefin sheath cable that does not have halogen, including a plurality of sinle silk, the filling layer, around the covering, shielding layer and sheath, the sinle silk divide into three cross-section and is fan-shaped core group, the inside of every core group is provided with the filling layer and the skin is provided with the aluminium foil, set up the outside at the sinle silk around the covering, include fire-retardant glass fiber tape around the covering, be provided with ceramic silicon rubber around the skin of covering, ceramic silicon rubber's skin is provided with soft protective layer, soft protective layer is made by irradiation crosslinked halogen-free low smoke polyolefin material, soft protective layer includes that the outside circumference along ceramic silicon rubber sets up concave-convex structure, the outside of soft protective layer is provided with the copper wire braided net, be provided with wheat between copper wire braided net. The utility model provides a pliability and the intensity of cable are higher, and insulating effect, shielding effect and flame retardant efficiency are good, and life is longer, is fit for extensive the popularization.

Description

Double-layer insulation irradiation cross-linking halogen-free low-smoke flame-retardant polyolefin sheathed cable

Technical Field

The utility model belongs to the technical field of power cable, especially, relate to a double-deck insulating irradiation crosslinked halogen-free low fire-retardant polyolefin sheath cable of cigarette.

Background

The irradiation crosslinking cable is a cable manufactured by using an irradiation crosslinking process, wherein the irradiation crosslinking is to bombard an insulating layer by using high-energy electron beams generated by an electron accelerator to break molecular chains to form macromolecular free radicals, and then the macromolecular free radicals are recombined into crosslinking bonds, so that the original linear molecular structure is changed into a three-dimensional reticular molecular structure to form crosslinking. The irradiation crosslinking cable has excellent mechanical and physical properties, resistance to various chemical solvents, small outer diameter, light weight and convenient installation and transportation, and the maximum rated temperature of the irradiation crosslinking insulated cable can reach 125 ℃ when the irradiation crosslinking insulated cable works for a long time, and the current-carrying capacity is greater than that of the polyvinyl chloride insulated cable; corrosive gas and toxic gas are not released during combustion, and secondary harm is not generated; meanwhile, the composite material also has good electrical performance.

Existing radiation crosslinked cables are typically rope-like cables made by stranding several or groups of wires (at least two per group) for communication or power transmission. Specifically, the cable comprises a conductor, an insulating layer, a filling layer, a wrapping layer, a shielding layer and a sheath, wherein the shielding layer is generally a single-layer shielding. Its holistic inner structure is comparatively simple, and structural strength, fire behaviour, shielding effect and life etc. have great promotion space in addition.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the technical problem that foretell cable exists, provide a reasonable in design, the higher and longer low fire-retardant polyolefin sheath cable of steamed low cigarette of double-deck insulating irradiation cross-linking of physical properties.

In order to achieve the above object, the technical solution adopted by the present invention is that, the double-layer insulation irradiation crosslinking halogen-free low-smoke flame-retardant polyolefin sheathed cable provided by the present invention comprises a plurality of wire cores, a filling layer, a wrapping layer, a shielding layer and a sheath, wherein the wire cores comprise a conductor and an insulating layer arranged outside the conductor, the wire cores are divided into three wire core groups with sector cross sections, the filling layer is arranged inside each wire core group, the aluminum foil is arranged on the outer layer, the wrapping layer is arranged outside the wire cores, the wrapping layer comprises a flame-retardant glass fiber tape, the ceramic silicon rubber is arranged on the outer layer of the wrapping layer, the outer layer of the ceramic silicon rubber is provided with a soft protection layer, the soft protection layer is made of irradiation crosslinking halogen-free low-smoke polyolefin material, the soft protection layer comprises a plurality of concave-convex structures arranged along the outer circumferential, the adjacent concave-convex structures are closely arranged and matched with axial grooves formed in the outer side face of the ceramic silicon rubber, a copper wire woven mesh is arranged on the outer side of the soft protective layer, a mylar layer and an armor layer which are distributed inside and outside are arranged between the copper wire woven mesh and the sheath, and the sheath is arranged on the outer side of the armor layer.

Preferably, the filling layer is provided with filling ropes, and insulating glue is arranged between the filling ropes.

Preferably, the thickness of the soft protection layer is 0.5-1 mm.

Preferably, the thickness of the ceramic silicon rubber is 1-3 mm.

Preferably, the sheath is made of a halogen-free low-smoke flame-retardant polyolefin material.

Compared with the prior art, the utility model discloses an advantage lies in with positive effect:

the utility model provides a pair of double-deck insulating irradiation crosslinked halogen-free low smoke flame retardant polyolefin sheath cable, through the structural feature of soft protective layer self and with ceramic silicon rubber's cooperation mode effectively improved the pliability and the intensity of cable, through improving the insulating effect of cable around covering and ceramic silicon rubber in addition, aluminium foil and copper wire mesh grid can improve the shielding ability of cable simultaneously, and. The utility model relates to a rationally, life is longer, is fit for extensive the popularization.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

FIG. 1 is a schematic structural diagram of a double-layer insulated irradiation cross-linked halogen-free low-smoke flame-retardant polyolefin sheathed cable provided by an embodiment;

in the above figures, 1, core; 11. a wire core group; 2. a filling layer; 3. wrapping a covering; 4. a shielding layer; 41. aluminum foil; 42. weaving a mesh with copper wires; 5. ceramizing silicon rubber; 51. an axial groove; 6. a soft protective layer; 7. a Mylar film layer; 8. an armor layer; 9. a sheath.

Detailed Description

In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be further described with reference to the accompanying drawings and examples. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict. For convenience of description, the words "upper", "lower", "left" and "right" used herein refer to the same directions as the drawings, and do not limit the structure.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the present invention is not limited to the limitations of the specific embodiments of the present disclosure.

Example, as shown in fig. 1, the utility model provides a double-layer insulation irradiation cross-linking halogen-free low-smoke flame-retardant polyolefin sheathed cable, including a plurality of core 1, a filling layer 2, a wrapping layer 3, a shielding layer 4 and a sheath 9, the core 1 includes a conductor and an insulating layer arranged outside the conductor, the core 1 is divided into three core groups 11 with sector cross sections, the inside of each core group 11 is provided with the filling layer 2 and the outside is provided with an aluminum foil 41, the wrapping layer 3 is arranged outside the core 1, the wrapping layer 3 includes a flame-retardant glass fiber tape, the outside of the wrapping layer 3 is provided with a ceramic silicon rubber 5, the outside of the ceramic silicon rubber 5 is provided with a soft protection layer 6, the soft protection layer 6 is made of irradiation cross-linking halogen-free low-smoke polyolefin material, the soft protection layer 6 includes a plurality of concave-convex structures arranged along the outer circumference of the ceramic silicon rubber 5, adjacent concave-convex structures are closely arranged and matched with an, the outside of soft protective layer 6 is provided with copper wire woven mesh 42, is provided with interior outer Mylar rete 7 and the armor 8 that distribute between copper wire woven mesh 42 and the sheath 9, and the sheath 9 sets up the outside at armor 8.

In this device, the structural strength of cable itself can be improved to the combination that adopts three fan-shaped core group 11, under the effect of internal shield layer and external shield layer, aluminium foil 41 and copper wire woven mesh 42 promptly, have effectively improved the shielding effect of cable. The glass fiber belt adopted by the flame-retardant glass fiber belt plays roles of high flame retardance, oxygen isolation and fire isolation, improves the flame retardant property of the product, and has fireproof and insulating effects. The ceramic silicon rubber 5 is directly sleeved outside the wrapping layer 3 by adopting extrusion molding, has the characteristics of excellent fire resistance, flame retardance, low smoke, no toxicity and the like, and is simple in extrusion molding process. The other excellent effect of the copper wire mesh grid 42 is that the tightness between the ceramic silicon rubber and the soft protective layer 6 in the device can be strengthened, and the physical performance of the cable is effectively improved. Further, the axial recess 51 of pottery silicon rubber increases the adhesive force of soft protection layer 6 on pottery silicon rubber, and the structure of soft protection layer 6 is as the biggest characteristics of this novel cable of use, this soft protection layer 6's concave convex structure can provide certain week clearance for the cable, every week interval's distance is less than 0.1mm, make the cable automatically close adjacent concave convex structure's week clearance in the bending, but soft protection layer 6 still has sufficient structural strength under the protection of filling net rope and copper wire woven mesh 42, good anti extrusion ability has been obtained simultaneously like this, toughness and intensity, effective life is longer. Moreover, the polyolefin material of the soft protective layer 6 has obvious performance change after radiation crosslinking, such as improvement of mechanical performance, reduction or disappearance of environmental stress cracking resistance, improvement of oxidation resistance and thermal deformation resistance, and especially obvious thin-wall insulation effect. The mylar film layer 7 has the characteristics of high insulation strength and voltage resistance, is resistant to invasion of moisture, gas, high heat and chemical substances, has low shrinkage rate, is not easy to embrittle, and is wear-resistant. Armor 8 has certain anti external force performance, can also carry and prevent that the mouse from baiting, is unlikely to lead to the fact the power transmission problem through the armor, and the bend radius of armor will be big, and the armor can ground connection, protection cable.

Further, the utility model provides a be provided with the packing rope in the filling layer 2, be provided with the insulating cement between the packing rope, the insulating cement is packed as the protection of packing rope and has not only improved the insulating properties of filling layer, has still strengthened closely the degree, makes it have higher structural strength.

In order to improve the toughness and the intensity of cable, the utility model provides a soft protective layer 6's thickness is 0.5 ~ 1 mm. The thickness of the ceramic silicon rubber 5 is 1-3 mm, on one hand, enough insulation protection and flame-retardant protection can be guaranteed, and on the other hand, the axial groove depth of 0.5-1.5 mm can be provided to fix the soft protection layer, so that the soft protection layer can fully exert the toughening and reinforcing effects.

The sheath 9 is made of halogen-free low-smoke flame-retardant polyolefin material, and has good insulativity and corrosion resistance, easy processing and long service life.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in other forms, and any person skilled in the art may use the above-mentioned technical contents to change or modify the equivalent embodiment into equivalent changes and apply to other fields, but any simple modification, equivalent change and modification made to the above embodiments according to the technical matters of the present invention will still fall within the protection scope of the technical solution of the present invention.

Claims (5)

1. A double-layer insulation irradiation crosslinking halogen-free low-smoke flame-retardant polyolefin sheath cable comprises a plurality of wire cores, a filling layer, a winding layer, a shielding layer and a sheath, wherein the wire cores comprise conductors and insulating layers arranged outside the conductors, the double-layer insulation irradiation crosslinking halogen-free low-smoke flame-retardant polyolefin sheath cable is characterized in that the wire cores are divided into three wire core groups with sector cross sections, the filling layer and the outer layer of each wire core group are provided with aluminum foils, the outer layer of each wire core group is provided with the aluminum foils, the winding layer is arranged outside the wire cores and comprises flame-retardant glass fiber belts, the outer layer of each winding layer is provided with ceramic silicon rubber, the outer layer of each ceramic silicon rubber is provided with a soft protective layer, the soft protective layer is made of irradiation crosslinking halogen-free low-smoke polyolefin materials, the soft, the outer side of the soft protective layer is provided with a copper wire woven mesh, a mylar film layer and an armor layer which are distributed inside and outside are arranged between the copper wire woven mesh and the sheath, and the sheath is arranged on the outer side of the armor layer.

2. The double-layer insulation irradiation crosslinking halogen-free low-smoke flame-retardant polyolefin sheathed cable according to claim 1, characterized in that filling ropes are arranged in the filling layer, and insulating glue is arranged between the filling ropes.

3. The double-layer insulation irradiation crosslinking halogen-free low-smoke flame-retardant polyolefin sheathed cable according to claim 2, characterized in that the thickness of the soft protection layer is 0.5-1 mm.

4. The double-layer insulation irradiation crosslinking halogen-free low-smoke flame-retardant polyolefin sheathed cable according to claim 3, characterized in that the thickness of the ceramic silicon rubber is 1-3 mm.

5. The double-layer insulation irradiation cross-linked halogen-free low-smoke flame-retardant polyolefin sheathed cable according to claim 4, wherein the sheath is made of a halogen-free low-smoke flame-retardant polyolefin material.

Images