CN216849438U - Fire-resistant medium voltage cable of pottery silicone rubber - Google Patents

Abstract

The utility model provides a fire-resistant medium voltage cable of pottery silicon rubber, including cable core and protective sheath, be equipped with the filling layer between cable core and the protective sheath, cable core includes the conductor, and the conductor is outer in proper order cladding internal shield layer, insulating layer, outer shielding layer and metallic shield, the protective sheath includes first around the band layer, and first is equipped with around the band layer outside and separates the oxygen layer, separates the outer ceramization silastic-layer that sets up of oxygen layer, separates between oxygen layer and the ceramization silastic-layer and all around the soft fire rope of cladding in the ceramization silastic-layer outside, and the soft fire rope outside that is located the outer lane is around establishing the third around the band layer, and the third sets gradually armor and protective sheath around the band layer outside. The cable can protect the ceramic silicon rubber, and meanwhile, the ceramic silicon rubber is enabled to have space for expansion deformation during high-temperature ceramic.

Description

Fire-resistant medium voltage cable of pottery silicone rubber

Technical Field

The utility model relates to a medium voltage cable field, in particular to fire-resistant medium voltage cable of pottery silicon rubber.

Background

The power cable has high barrier and high flame retardant properties while meeting good conductive performance. The barrier flame retardance of the power cable mainly comprises material barrier flame retardance and structure barrier flame retardance, wherein the barrier flame retardance material comprises an organic material and an inorganic material, the organic material comprises halogen series, phosphorus series, nitrogen series and the like, and the inorganic material is mainly metal oxide. Currently, the base materials of domestic flame-retardant cables are mostly polyolefins, such as Low Density Polyethylene (LDPE), Linear Low Density Polyethylene (LLDPE), ethylene-vinyl acetate copolymer (EVA), ethylene-ethyl acrylate copolymer (EEA), ethylene-propylene copolymer (EPR), and the like; the flame retardant is mainly halogen-free flame retardant Al (OH)3, Mg (OH)2, and the like. Although the existing fireproof cable can play a fireproof role, the fireproof effect is poor, and the fireproof capacity is reduced when the outer sheath layer cracks. When catching fire from outside restrictive coating, the intensity of a fire all can be developed into inside the cable core by the restrictive coating, because the inside material that is not equipped with isolated oxygen of cable core makes the intensity of a fire between the cable core stretch to both can't play certain guard action to the cable core, make the fire resistance of cable reduce. Moreover, the existing composite medium-voltage cable has poor protection effect and low tensile strength, so that the cable is easily damaged by external factors in the use process, the cable is damaged, the cable cannot be well protected, and the practicability of the device is reduced. And the cable core in the existing fire-resistant cable has poor shielding effect on an electric field, and certain interference is generated on instruments nearby the cable.

The ceramic silicon rubber fire-resistant cable has very good performances of fire prevention, fire resistance, flame retardance, low smoke and no toxicity, the ceramic silicon rubber is used as an insulated cable, an insulating layer of the cable is sintered to form a ceramic hard shell after combustion, the fire can be effectively blocked, but the ceramic silicon rubber can expand in the ceramic process, and the expansion space is limited, so that the cable is easy to damage. The ceramic silicon rubber has good cable flexibility and bending performance at normal temperature. Easy bending and processing, but the mechanical stress damage resistance is weaker, and protective measures are needed for protection.

Disclosure of Invention

The utility model aims to solve the technical problem that a pottery fire-resistant medium voltage cable of silicon rubber is provided, can protect pottery silicon rubber, simultaneously, have the space to carry out the expansion deformation when guaranteeing pottery silicon rubber high temperature ceramic.

In order to solve the technical problem, the utility model discloses a technical scheme does: the utility model provides a fire-resistant medium voltage cable of pottery silicon rubber, includes cable core and protective sheath, is equipped with the filling layer between cable core and the protective sheath, and cable core includes the conductor, and outer cladding internal shield layer, insulating layer, outer shielding layer and the metallic shield layer of conductor in proper order, the protective sheath includes first around the band layer, and first is equipped with around the band layer outside and separates the oxygen layer, separates the outer ceramization silastic-layer that sets up of oxygen layer, separates between oxygen layer and the ceramization silastic-layer outside all around wrapping the fireproof rope, is located the soft fireproof rope outside of outer lane around establishing the third around the band layer, and the third sets gradually armor and protective sheath around the band layer outside.

In a preferred scheme, the soft fire-resistant rope is a rock wool rope.

In a preferred scheme, the armor layer is of a double-layer structure, and a buffer layer is arranged between double layers of the armor layer.

In a preferred embodiment, the cushion layer is a rubber tape or a fiber tape.

In a preferred embodiment, a total shielding layer is disposed between the first wrapping tape layer and the filling layer.

In a preferable scheme, a second wrapping band layer is arranged between the soft fire-resistant rope positioned on the inner ring and the oxygen insulation layer.

In a preferred embodiment, the first, second and third wrapping tape layers are alkali-free fiberglass wrapping tapes or halogen-free wrapping tapes.

In a preferred embodiment, the insulating layer is made of cross-linked polyethylene.

In a preferred embodiment, the filling layer is alkali-free glass fiber.

In a preferred embodiment, the oxygen index of the oxygen barrier layer is greater than 45.

The utility model provides a pair of fire-resistant medium voltage cable of pottery silicon rubber through setting up ceramic silicon rubber layer, utilizes its insulating layer sintering behind the burning to form ceramic duricrust, can carry out effective separation to the intensity of a fire, realizes fire-resistant effect, sets up soft fire rope in ceramic silicon rubber in situ, the outside simultaneously, for ceramic silicon rubber layer pottery provides deformation space, prevents that its ceramic in-process from producing the damage because the inflation is limited, influences its fire behavior. Can carry out mechanical protection to ceramic silicone rubber layer through setting up the armor, prevent that it from wearing and tearing or receive external damage, through setting up the armor into bilayer structure and filling the buffer layer, effectively cushion the mechanical impact force of outside, improve the resistant mechanical external damage ability of cable.

Drawings

The invention is further described below with reference to the accompanying drawings and examples:

fig. 1 is a schematic structural view of the present invention;

in the figure: conductor 1, internal shield 2, insulating layer 3, external shield 4, metallic shield 5, filling layer 6, total shielding layer 7, first band layer 8 of winding, separate oxygen layer 9, the second is around band layer 10, soft fire rope 11, ceramization silicon rubber layer 12, the third is around band layer 13, armor 14, buffer layer 15, protective sheath 16.

Detailed Description

As shown in figure 1, a fire-resistant medium voltage cable of pottery silicon rubber, including cable core and protective sheath, be equipped with filling layer 6 between cable core and the protective sheath, filling layer 6 is alkali-free glass silk, and the cable core includes conductor 1, and 1 outer cladding internal shield layer 2, insulating layer 3, outer shielding layer 4 and the metallic shield layer 5 in proper order of conductor, conductor 1 are many soft circle copper single lines and sticis formed according to concentric layer-stepping transposition, and 3 materials of insulating layer are crosslinked polyethylene. The inner shielding layer 2, the insulating layer 3 and the outer shielding layer 4 are extruded and molded simultaneously, and the metal shielding layer 5 is a copper wire and copper strip combined shielding.

The protective sheath includes first around band layer 8, and first around the band layer 8 outside be equipped with and separate oxygen layer 9, separate the outer preceraming silica rubber layer 12 that sets up of oxygen layer 9, separate between oxygen layer 9 and the preceraming silica rubber layer 12 outside all around package soft fire rope 11, the soft fire rope 11 outside that is located the outer lane is around establishing third around band layer 13, and the third sets gradually armor 14 and protective sheath 16 around the band layer 13 outside.

In this embodiment, the first wrapping tape layer 8 and the third wrapping tape layer 13 are alkali-free glass fiber wrapping tapes or halogen-free wrapping tapes or alkali-free glass fiber fabrics, and are formed by wrapping.

The soft fire-resistant rope 11 is loosely wound between the oxygen-isolating layer 9 and the ceramic silicon rubber layer 12 or outside the ceramic silicon rubber layer 12, so that deformation spaces are arranged on the inner side and the outer side of the ceramic silicon rubber layer 12, a space is provided for the ceramic silicon rubber layer 12 to expand in the process of ablating the ceramic shell, and the fire-resistant heat-insulating layer is prevented from being damaged in the ceramic process.

The soft fire-resistant rope 11 is made of rock wool, which is a good material with fire resistance and heat insulation, and can play a good role in isolating heat transfer and effectively prevent high-temperature conduction.

Preferably, a second wrapping band layer 10 is arranged between the soft fire-resistant rope 11 positioned at the inner ring and the oxygen barrier layer 9. The second wrapping band layer 10 wraps and compresses the oxygen barrier layer 9, and the fire resistance is further improved.

The oxygen index of the oxygen barrier layer 9 is greater than 45. In this embodiment, the oxygen-barrier layer 9 is made of flame-retardant polyvinyl chloride or environment-friendly low-smoke halogen-free flame-retardant polyolefin.

The armor layer 14 is formed by lapping and covering copper strips in an overlapping mode. By providing the third wrapping tape layer 13, mechanical damage to the silicone rubber ceramic layer 12 by the armor layer 14 can be reduced.

Protective sheath 16 is prepared by the combined material of silicone and glass fiber, and this material makes protective sheath 16 durable wear-resisting and resistance to compression ageing strong, has prolonged the life of cable conductor.

Preferably, the armor layer 14 is a double-layer structure, and a buffer layer 15 is arranged between the double layers of the armor layer 14. The cushioning layer 15 is a rubber strip or a fiber strip with a certain thickness and a certain elasticity.

Specifically, after the soft copper strip is wound outside the third winding and wrapping strip layer 13, the buffer layer 15 is wound, and then the soft copper strip is reversely wound. Through filling buffer layer 15 between bilayer structure's armor 14, on the one hand through setting up bilayer structure, improve armor 14's protecting effect, the another side is through setting up buffer layer 15, effectively cushions the mechanical impact force of outside, improves the resistant mechanical external damage ability of cable.

Preferably, a total shielding layer 7 is arranged between the first wrapping tape layer 8 and the filling layer 6. The total shielding layer 7 can adopt a metal shielding layer or shielding layers in other forms, so that the shielding effect on an electric field is improved, the interference on instruments nearby the cable is avoided, and the personal safety of operating personnel nearby the cable is ensured.

According to the fire-resistant medium-voltage cable, the ceramic silicon rubber layer 12 is arranged, the insulating layer of the fire-resistant medium-voltage cable is sintered to form the ceramic hard shell after the fire-resistant medium-voltage cable is combusted, the fire can be effectively blocked, the fire-resistant effect is achieved, meanwhile, the soft fire-resistant ropes 11 are arranged inside and outside the ceramic silicon rubber layer 12, a deformation space is provided for ceramic of the ceramic silicon rubber layer 12, and the fire-resistant capacity of the fire-resistant medium-voltage cable is prevented from being influenced due to damage caused by limited expansion in the ceramic process. Can carry out mechanical protection to ceramic silicone rubber layer 12 through setting up armor 14, prevent that it from wearing and tearing or receiving external force damage, through setting up armor 14 to bilayer structure and filling buffer layer 15, effectively cushion the mechanical impact force of outside, improve the resistant mechanical external force damage ability of cable.

Taking GXNH-YJY 238.7/15 kV 3X 120 representative cable as an example, the tear strength is more than or equal to 16kN/mm, the breakdown strength is more than or equal to 18MV/m, the porcelain forming rate is more than or equal to 78%, the volume resistivity at 20 ℃ is more than or equal to 1.0X 1011 omega.m, the tensile strength is more than or equal to 4MPa, the elongation at break is more than or equal to 10% by utilizing an air oven heat aging test, and the cable can not be fused after a 2A fuse fire resistance test.

Claims (10)

1. The utility model provides a fire-resistant medium voltage cable of pottery silicon rubber, includes cable core and protective sheath, is equipped with filling layer (6) between cable core and the protective sheath, and cable core includes conductor (1), and conductor (1) is outer in proper order cladding internal shield layer (2), insulating layer (3), external shield layer (4) and metallic shield (5), its characterized in that: the protective sheath includes first around band layer (8), first around band layer (8) the outside be equipped with separate oxygen layer (9), separate oxygen layer (9) outer setting pottery silica gel layer (12), separate between oxygen layer (9) and pottery silica gel layer (12) the outside all around package soft fire-resistant rope (11), soft fire-resistant rope (11) the outside that is located the outer lane is around establishing third around band layer (13), the third sets gradually armor (14) and protective sheath (16) around band layer (13) the outside.

2. A ceramicized silicone rubber fire-resistant medium voltage cable according to claim 1, wherein: the soft fire-resistant rope (11) is a rock wool rope.

3. A ceramicized silicone rubber fire-resistant medium voltage cable according to claim 1, wherein: the armor layer (14) is of a double-layer structure, and a buffer layer (15) is arranged between the double layers of the armor layer (14).

4. A ceramicized silicone rubber fire-resistant medium voltage cable according to claim 3, wherein: the buffer layer (15) is a rubber strip or a fiber strip.

5. A ceramicized silicone rubber fire-resistant medium voltage cable according to claim 1, wherein: and a total shielding layer (7) is arranged between the first wrapping tape layer (8) and the filling layer (6).

6. A ceramicized silicone rubber fire-resistant medium voltage cable according to claim 1, wherein: a second wrapping band layer (10) is arranged between the soft fire-resistant rope (11) positioned on the inner ring and the oxygen-isolating layer (9).

7. A ceramicized silicone rubber fire-resistant medium voltage cable according to claim 6, wherein: the first wrapping tape layer (8), the second wrapping tape layer (10) and the third wrapping tape layer (13) are alkali-free glass fiber wrapping tapes or halogen-free wrapping tapes.

8. A ceramicized silicone rubber fire-resistant medium voltage cable according to claim 1, wherein: the insulating layer (3) is made of cross-linked polyethylene.

9. A ceramicized silicone rubber fire-resistant medium voltage cable according to claim 1, wherein: the filling layer (6) is alkali-free glass fiber.

10. A ceramicized silicone rubber fire-resistant medium voltage cable according to claim 1, wherein: the oxygen index of the oxygen barrier layer (9) is more than 45.

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