CN2819405Y

CN2819405Y - Fireproofing electric cable

Info

Publication number: CN2819405Y
Application number: CN 200520073925
Authority: CN
Inventors: 汪传斌; 胡青平
Original assignee: YUANDONG ELECTRIC CABLE FACTORY; JIANGSU FAR EAST GROUP CO Ltd
Current assignee: Far East Holding Group Co Ltd; Far East Cable Co Ltd
Priority date: 2005-07-20
Filing date: 2005-07-20
Publication date: 2006-09-20
Anticipated expiration: 2015-07-20

Abstract

The utility model relates to the improvement of a fireproof cable, which is characterized in that an inorganic fireproof expanding layer is arranged between a conductor wire core of a mica fireproof insulation layer and an embossing metallic sheath. After a cable meets fire, the inorganic fireproof expanding layer expands and is pressed tightly, thermal insulation and temperature drop are done, and the mica fireproof insulation layer is pressed tightly. The structure of the mica fireproof insulation layer is more compact and stabler and can bear epigene actions such as water sprinkling, vibration, impact, etc., intact insulation still can be kept, or even the structure can be continued to be used in firing environment, and electricity is supplied normally. Because high-temperature resistant inorganic materials and metal materials are adopted by the cable completely, and thus the working temperature of the cable is evidently enhanced, and the cable can operates in the temperature environment of 800 DEG C for a long term. The cable of the utility model simultaneously has the advantages of a fireproof cable of mineral insulation and a fireproof cable of mica insulation, and the shortages of the fireproof cable of mineral insulation and the fireproof cable of mica insulation are overcome.

Description

Fire-resisting cable

Technical field

Utility model is about the improvement to fire-resisting cable, relates in particular to a kind of serviceability temperature height, good bending property, and technology is simple, and factory length is long, the fire-resisting cable that still can continue to use after catching fire.

Background technology

The mineral insulation fire-resisting cable, though have high serviceability temperature, and after catching fire, still can keep the long duration to continue power supply, but exist voltage withstand class low, make comparatively complexity, cost involves great expense, and is subjected to the undergauge stretch limit, not only the cable specification is restricted, and factory length is shorter, need use than polylinker to connect, and the cable bending property is poor besides, the construction requirement height makes to use to be restricted.

The wrapped hot-face insulation cable of mica has improved above-mentioned shortcoming, but because of there being organic material layer, its deficiency is: cable can not bear high temperature, so this type of cable generally can only use below 200 ℃; Secondly, after meeting fire burns, organic material is burnt mistake, can cause the cable internal structure loosening and be loose unstable, even cause the fragmentation of mica insulation layer, and function of supplying power is normally used in very fast forfeiture, can not continue to use; Besides, can produce carbide or silicon dioxide conduction after organic layer catches fire, also be to cause a reason can not normally using; Therefore use and be subjected to certain limitation equally.

For this reason, people carry out various improvement to mica hot-face insulation cable, gather mineral insulation and mica insulation advantage to attempt acquisition, eliminate its not enough fire-resisting cable.As Chinese patent 02138446.0 and 02257790.4 disclosed copper core copper sheath mineral insulated cable, form core by conductor and mica tape lapping layer, between core and copper sheath, fill the magnesia powder insulating barrier again, the undergauge closely knit space that stretches.But this cable is owing to adopt the mineral powder to fill, and the shortcoming of mineral cable is not still eliminated.

Chinese patent 03206644.9 disclosed fireproof power cable, its structure are that conductor is followed successively by wrapped fire-resistant isinglass belt, polyester belt, insulating barrier outward, wraps up nonwoven fabrics, steel-tape armouring layer, oversheath successively selectively.Because of still there being organic matter layer in the cable, so still the problems referred to above can occur.

Chinese patent 200410083982.1 disclosed flexible fire-proof cables, its structure are conductor outer wrapping mica tape insulating barrier, and then parcel embossing metallic sheath.Though do not use organic material in the cable, overcome the deficiency that organic material brings, but press owing to be difficult to accomplish not have the gap in the metallic sheath, the mica insulating barrier can become loose unstable in the hot environment of catching fire, water-fast pouring, impact, vibration ability are descended greatly, cause the damage of insulating barrier, therefore still can not use the long period at fire environment.

Chinese patent 03132139.9 disclosed intumescent fire-resisting cable, its structure is: insulated wire cores has the crosslinked polyethylene separation sleeve outward, and separation sleeve is filled with fire-resistant expansion layer mineral outward, and expansion sleeve and oversheath are arranged outward.Yet this structural cable, the one, still there is organic material layer (crosslinked polyethylene), its shortcoming is obvious, can not be used for the higher temperature environment equally and use; The 2nd, very fast easy deformation was damaged after fire burns was met in outer jacket and interior insulation; The 3rd, fire-resistant expansion layer mineral is sheath protection for want of after catching fire, and also can cause damage because of water pouring, vibration, impact etc. in the fire fighting process.Therefore reality is difficult to guarantee still can keep normal power supply to use in the back long period of catching fire.

So comprehensive mineral insulation of a kind of real energy and mica insulation fire-resisting cable advantage are not arranged so far, eliminate the fire-resisting cable of its shortcoming, still having is worth improved place.

Summary of the invention

The purpose of utility model is to overcome the deficiency of above-mentioned prior art, a kind of collection mineral insulation and mica insulation advantage are provided, but length manufacturing, technology is simple, good bandability, can in hot environment, use, and the long duration refractory insulating layer can be not destroyed after catching fire, and still can keep the fire-resisting cable of safe power supply.

The utility model purpose realizes, the main improvement is between cable mica insulation and embossing metallic sheath, set up an inorganic fire-resistant expanding layer, whole like this insulating barrier all is an inorganic fire proof material, thereby effectively improved the cable working temperature, cable is being used in the environment below 800 ℃ for a long time, and the inorganic fire-resistant expanding layer in the embossing metallic sheath of chance fire back produces expansion and compresses, not only heat insulation reduction temperature, and make the mica refractory insulating layer more stable, thereby can bear the water pouring, vibration, external force effects such as impact insulation does not damage, and can keep long-time normal power supply.Specifically, the utility model fire-resisting cable comprises outer mica refractory insulating layer of conductor and conductor and embossing metallic sheath, it is characterized in that inorganic fire-resistant expanding layer is arranged between mica refractory insulating layer and embossing metallic sheath.

The said conductor of utility model can be the single round copper wire that is drawn into of copper rod and through the softening solid conductor of handling, and can be stranded compact conductor also, looks use occasion and selects for use.

Inorganic fire-resistant expanding layer between said mica refractory insulating layer and embossing metal sheath can be wrapped inorganic fire-resistant zone of swelling, also can be the inorganic refractory swelling material of filling.Utility model is especially adopting wrapped form for well, and the one, help improving the cable bendability, the one, can bear higher ignition temperature.

The utility model cable can be made single-core cable, also can make multicore cable.Multicore cable also can be filled inorganic fire proof material (for example glass fibre, rock wool material) between twisted cable core, one can make the cable core rounding, obtains constitutionally stable cable core, and two help compressing of each conductor mica insulation layer, obtain stable insulated fireproof layer.

Utility model is owing to be provided with inorganic fire-resistant expanding layer between mica refractory insulating layer and embossing metallic sheath, cable is met the inorganic fire-resistant expanding layer generation expansion in fire back and is compressed, both heat insulation reduction temperature, cause pressing again to the mica refractory insulating layer, make the structure of refractory insulating layer more stable in high temperature, can bear external force effects such as water pouring, vibration, impact, still can keep insulating barrier intact, so that can be at the continuous use of fire environment relaying, normal power supply.Because cable adopts the inorganic material and the metal material of high-temperature resistant fully, thereby has significantly improved the cable serviceability temperature, can move in 800 ℃ of following temperature environments for a long time.Besides, cable adopts mica insulation, inorganic fire-resistant expanding layer, embossing metallic sheath to have bending property preferably, and manufacturing process is simple, and cost is low, and factory length is long, and specification limit is wide, and is applied widely.Therefore, the utility model fire-resisting cable has had mineral insulation and mica insulation fire-resisting cable advantage simultaneously concurrently, has overcome both deficiencies.

Below in conjunction with two embodiments, further specify utility model.

Description of drawings

Fig. 1 is the utility model first example structure schematic diagram.

Fig. 2 is the utility model second example structure schematic diagram.

Embodiment

Embodiment 1: referring to Fig. 1, single core fire-resisting cable draws single round copper wire solid conductor 1 at copper rod, the smooth densification in outside is surrounded with mica tape refractory insulating layer 2 and forms core, core is surrounded with inorganic fire-resistant zone of swelling 4 outward, welds by vertical bag and argon arc outward and forms copper pipe sheath 5, and handle through embossing.Inorganic fire-resistant zone of swelling is formed (also can commercial inorganic refractory swelling material) by glass fibre base band one side or double face binding by inorganic fire proof material and expanding fire retardant.

Embodiment 2: referring to Fig. 2, three core fire-resisting cables, conductor 1 adopts the stranded copper conductor that presses, each conductor is surrounded with mica refractory insulating layer 2 outward, three stranded strandings of mica insulation core, be filled with refractory glass fiber 3 between core, outer wrapped (or filling) has inorganic fire-resistant expanding layer 4, and embossing stainless steel sheath 5 is arranged outward.

Embodiment 3: as described above, according to laying and protect needs, be extruded with the universal cordage outer jacket again outside metallic sheath.

In addition, inorganic fire-resistant expanding layer can also obtain by the inorganic expanding material of filling, can also adopt other inorganic flame-proofing matter of filling between cable core, and these unsubstantialities change all true novel protected scope of using.

Claims

1, fire-resisting cable comprises outer mica refractory insulating layer of conductor and conductor and embossing metallic sheath, it is characterized in that inorganic fire-resistant expanding layer is arranged between mica refractory insulating layer and embossing metallic sheath.

2,, it is characterized in that said inorganic fire-resistant expanding layer is inorganic fire-resistant zone of swelling lapping layer according to the described fire-resisting cable of claim 1.

3, according to claim 1 or 2 described fire-resisting cables, it is characterized in that being filled with inorganic flame-proofing matter between the mica insulation cable core.

4,, it is characterized in that inorganic flame-proofing matter is a refractory glass fiber according to the described fire-resisting cable of claim 3.

5,, it is characterized in that metallic sheath is extruded with outer jacket outward according to the described fire-resisting cable of claim 3.

6,, it is characterized in that metallic sheath is extruded with outer jacket outward according to claim 1,2 or 4 described fire-resisting cables.