CN103021539A

CN103021539A - Medium-voltage capacity-expansion A-level flame retardant fire-resisting cable

Info

Publication number: CN103021539A
Application number: CN201110282759XA
Authority: CN
Inventors: 张志成; 张乒; 喻爱芳; 黄永飞
Original assignee: SHANDONG SOCO CABLE GROUP CO Ltd
Current assignee: SHANDONG SOCO CABLE GROUP CO Ltd
Priority date: 2011-09-22
Filing date: 2011-09-22
Publication date: 2013-04-03
Anticipated expiration: 2031-09-22
Also published as: CN103021539B

Abstract

The invention relates to a medium-voltage capacity-expansion A-level flame retardant fire-resisting cable. The structure comprises a cable wire core, a waterproofing isolation belt, an inorganic compound filler, a fiberglass binding band, an inner sheath, an armor layer as well as an outer sheath, wherein the wire core is a twisting conductor, a conductor shield, an insulator, an insulation shield and a metallic shield; and the metallic shield surrounds the waterproofing isolation belt, the filler adopts special formula inorganic mineral substance composite powder, a non alkali glass silk bag belt is surrounded, and an inner protecting layer, a galvanized steel strip and a ceramic sheath material are extruded and coated outside the bag belt. The medium-voltage capacity-expansion A-level flame retardant fire-resisting cable provided by the invention has the advantages that the medium-voltage capacity-expansion A-level flame retardant fire-resisting cable meets the flame retardant A-level and fireproof requirements, the internal temperature of the insulator is kept less than 160 DEG C under the condition that the flame temperature is 800 DEG C, the circuit is guaranteed to operate normally, and a filling material is changed, so that the transmission capability of the cable is improved; and the medium-voltage capacity-expansion A-level flame retardant fire-resisting cable is flame retardant and fireproof, the transmission capacity is expanded, the production process is simple and convenient, the construction is easy, the medium-voltage capacity-expansion A-level flame retardant fire-resisting cable is applicable to places requiring strict flame retardant and fireproof requirements, such as power stations, oil fields, high-rise buildings, subways, airports and chemical industry.

Description

Middle companding holds A level flame resistant cable

Technical field

The present invention relates to a kind of middle companding and hold the structure of A level flame resistant cable and the prescription of inorganic fill and porcelain sheath material, belong to the cable technology field.

Background technology

In recent years, domestic each big bus public place of entertainment, chemical industry, colliery, commercial building, people's life that fire of high-rise building causes and the heaviness loss of property, people have had more deep understanding to fire-fighting, fire safety; Sharp increase along with urban population; skyscraper, hotel, large supermarket, hospital, station, airport constantly increase; the construction of subway, tunnel traffic; and the increase of large-scale place of public amusement, public transit facility; the importance of fire-fighting fire-proof safety shows especially out; how in the situation that unusual fire occurs; ensure within a certain period of time electric power with communicate by letter unimpeded; win to greatest extent and ask when valuable; minimizing personnel's injures and deaths and the loss of lives and properties, this is that people are constantly exploring always.Thick oxygen barrier layer is filled and extruded to the in the past design of middle pressure drag combustion fireproof power cable mainly with glass fibre or mineral wool rope, insulation also can be because of overheated and cause cable breakdown in the combustion process, electrification occurs to use, do not reach lasting fire-resistant requirement, and in combustion process, can produce a large amount of dense smoke and harmful substance, cause secondary pollution to surrounding environment.Use simultaneously glass fibre or the rock wool of high thermal resistance to fill the diffusion that affects the cable conductor heat, make cable temperature too high, the transmittability that impact is whole.

Summary of the invention

The task of patent of the present invention is to solve cable to insulate in the flame situation and can keep normal electrical property, assurance works with electric line, fire-retardantly reach the above requirement of A level, during burning without noxious substance and dense smoke, and in normal use procedure, improve transmission capacity, reduce energy loss, carry the useful life of high pressure fire-resisting cable.Thereby the raising Electrical Safety reduces the characteristics such as use cost.

The present invention designs a kind of middle companding and holds A level flame resistant cable, comprise cable core, oversheath, it is characterized in that: described cable core is stranded conductor, outside cable core, be enclosed with according to this isolation strip that blocks water wrapped outside conductor shield, insulating barrier, insulation screen, metal screen layer and the metal screen layer, be filled with the inorganic mineral composite powder between cable core and oversheath, oversheath extrudes one deck sheath, galvanized steel strip and ceramic sheath material outward for alkali-free glass wool band, alkali-free glass wool band from the inside to the outside according to this.It is characterized in that: described inorganic mineral composite powder is the mixture of inorganic mineral and inorganic combustion inhibitor.The inorganic mineral composite powder is comprised of following constituent and percentage by weight: inorganic mineral calcium oxide 62.5%, inorganic combustion inhibitor is 37.5%, hydrotalcite 4.5%, aluminium hydroxide 25%, magnesium hydroxide 8% in the inorganic combustion inhibitor, the particle size diameter of all constituents is 1～100nm.It is characterized in that: described ceramic protective cover material is comprised of following constituent and weight portion: 30～40 parts of ethylene-ethyl acrylate copolymers, 30～40 parts of ethylene-ethyl acetate copolymers, 20～40 parts of polyethylene, become 55～85 parts of porcelain fillings, 0.5～2.5 part of coupling agent, fire retardant A90～100 part, fire retardant B15～20 part, 1～2 part of lubricant, 1～3 part in antioxidant.

The present invention is rational in infrastructure, manufactures than being easier to, and fire-retardantly greatly improves with fire resistance rating, and cable transmission capacity, serviceability and life-span all get a promotion.In the situation of control fire-resisting cable cost, use the inorganic compounding packing material, hydrotalcite wherein, aluminium hydroxide, magnesium hydroxide associating fire retardant can decomposite a large amount of water when burning, and produce metal oxide and be wrapped in closely on the core, play oxygen barrier, heat insulation, cooling effect, guarantee that insulation is normal and use.The thermal resistance of inorganic oxide calcium powder is very little, be filled in uniformly between the core, make the diffusion of heat stable equilibrium, except having reduced line loss, the reduction of conductor wire core temperature plays the energy-conservation effect, also prolonged the useful life of cable insulation and sheath, because the aging life-span of organic material and its working temperature just have a direct impact.

Description of drawings

Accompanying drawing is construction of cable drawing in side sectional elevation of the present invention.

Embodiment

Below by accompanying drawing patent of the present invention is introduced.

Comprise cable core, oversheath among the figure, it is characterized in that: described cable core is that multiply is pressed stranded copper conductor, outside cable core, be enclosed with according to this isolation strip that blocks water wrapped outside conductor shield, insulating barrier, insulation screen, metal screen layer and the metal screen layer, between cable core and oversheath, be filled with the inorganic mineral composite powder, one deck sheath, galvanized steel strip and ceramic sheath material that oversheath extrudes for alkali-free glass wool band, alkali-free glass wool band from the inside to the outside according to this outward.It is characterized in that: described inorganic mineral composite powder is the mixture of inorganic mineral and inorganic combustion inhibitor.The inorganic mineral composite powder is comprised of following constituent and percentage by weight: inorganic mineral calcium oxide 62.5%, inorganic combustion inhibitor is 37.5%, hydrotalcite 4.5%, aluminium hydroxide 25%, magnesium hydroxide 8% in the inorganic combustion inhibitor, the particle size diameter of all constituents is 1～100nm.It is characterized in that: described ceramic protective cover material is comprised of following constituent and weight portion: 30～40 parts of ethylene-ethyl acrylate copolymers, 30～40 parts of ethylene-ethyl acetate copolymers, 20～40 parts of polyethylene, become 55～85 parts of porcelain fillings, 0.5～2.5 part of coupling agent, fire retardant A90～100 part, fire retardant B15～20 part, 1～2 part of lubricant, 1～3 part in antioxidant.

Described cable core is that multiply is pressed twisted copper conductors (1), three-layer co-extruded semiconductive polyolefin conductor shield (2), the insulating barrier of crosslinked polyethylene (3), semiconductive polyolefin insulation shielding (4), outside insulation shielding (4) wrapped one deck put up rate greater than 15% copper strips as metal screen layer (5), the wrapped isolation strip that blocks water (6) outside metal screen layer, and guarantee that waterstop is closely wrapped and put up about 50%, fill inorganic mineral composite powder (7), and tight wrapped 2 layers of alkali-free glass wool band (8), band extrudes the material (9) of the high oxygen index polyolefin of one deck sheath outward, wrapped 2 layers of galvanized steel strip (10) between outside sheath, protecting, two-layer clearance control is at below 50% of width of steel band, extrude at last last layer ceramic sheath material (11), before extruding, the ceramic sheath material is stirred.The ceramic protective cover material can sinter duricrust into, and constitute jointly protective layer with steel band at rapid porcelain more than 750 ℃, and isolated flame guarantees that cable is complete under fire condition.

Claims

1. companding holds A level flame resistant cable in one kind, comprise cable core, oversheath, it is characterized in that: described cable core is stranded conductor, outside cable core, be enclosed with according to this isolation strip that blocks water wrapped outside conductor shield, insulating barrier, insulation screen, metal screen layer and the metal screen layer, between cable core and oversheath, be filled with the inorganic mineral composite powder, one deck sheath, galvanized steel strip and ceramic sheath material that oversheath extrudes for alkali-free glass wool band, alkali-free glass wool band from the inside to the outside according to this outward.

2. middle companding as claimed in claim 1 holds A level flame resistant cable, and it is characterized in that: described inorganic mineral composite powder is the mixture of inorganic mineral and inorganic combustion inhibitor.

3. middle companding as claimed in claim 2 holds A level flame resistant cable, it is characterized in that: the inorganic mineral composite powder is comprised of following constituent and percentage by weight: inorganic mineral calcium oxide 62.5%, inorganic combustion inhibitor is 37.5%, hydrotalcite 4.5%, aluminium hydroxide 25%, magnesium hydroxide 8% in the inorganic combustion inhibitor, the particle size diameter of all constituents is 1～100nm.

4. middle companding as claimed in claim 1 holds A level flame resistant cable, it is characterized in that: described ceramic protective cover material is comprised of following constituent and weight portion: 30～40 parts of ethylene-ethyl acrylate copolymers, 30～40 parts of ethylene-ethyl acetate copolymers, 20～40 parts of polyethylene become 55～85 parts of porcelain fillings, 0.5～2.5 part of coupling agent, fire retardant A90～100 part, fire retardant B15～20 part, 1～2 part of lubricant, 1～3 part in antioxidant.