CN202049787U - Environment-friendly weatherproof cable - Google Patents

Abstract

The utility model discloses an environment-friendly weatherproof cable, which mainly comprises a central cable core, a heat insulation layer, a heat radiation layer and an environment-friendly weatherproof outer sheath, wherein the heat insulation layer, the heat radiation layer and the environment-friendly weatherproof outer sheath are disposed outside the cable core. The environment-friendly weatherproof cable is applicable to places with densely laid cables and exposed to external conditions, such as sunlight, changing temperature, wind, rain, especially ultraviolet irradiation and the like. Once the cable is on fire, the cable must be low in smokiness and harmless when combusted, uninterrupted power supply for important loops is guaranteed, and thereby harm to surroundings, electrical equipment and personnel is lowest. A portion of the cable exposed to air must be insusceptible to the external conditions such as sunlight irradiation, changing temperature, wind, rain, especially ultraviolet irradiation and the like, so that series of ageing conditions of the cable such as shading, discoloring, cracking, pulverization, strength reduction and the like can be avoided, safety operation of the cable in a predetermined period is ensured, and market competition advantage of products of enterprises is improved.

Description

A kind of environmental protection weather resistant cable

Technical field

The utility model relates to the power cable field, specifically is a kind of by the intensive electric power that lays, communication and electrical equipment cable, and this cable also is subjected to the especially influence of external influence such as ultraviolet irradiation of solar radiation, variations in temperature, wind and weather.

Background technology

Though wires and cables industry is a supporting industry just, in occupation of the output value of Chinese electrician trade 1/4.Its product category is numerous, range of application is very extensive, relate to industries such as electric power, building, communication, manufacturing, all closely related with each department of national economy, be transmission of electric energy, transmission information and make various motors, instrument, instrument, realizing the indispensable basic equipment of electromagnetic energy conversion, is necessary base product in electrification, the informationized society

Electric wire is one of important channel of initiation fire, according to incompletely statistics, have among the dead personnel in the fire that causes because of electric wire in the fire that takes place 1/3rd be because the toxic gas death by suffocation that discharges when sucking the electric wire burning, therefore the fire that is caused by electric wire can not be ignored.The disaster that fire brings to the mankind is heavy, and loss is huge, and along with the development of economy and urban construction, fire damage is in rising trend, and therefore equal prevention of fires is very paid attention to both at home and abroad.How to stop the burning of electric wire, even gone back LSZH by the naked light burning, this is electric wire manufacturing one a big problem.China develops and has produced multiple flame retardant cable closely for many years.Cause the personnel death owing to produce a large amount of toxic and harmfuls during cable fire, and equipment is undermined the harm that smog seriously makes personnel in time not withdraw, the user has proposed cable not only should have good flame retardancy, and do not have hydracid (pernicious gas) in the gas of burning back generation, and the amount of being fuming is low.Developed halide-free low-smoke fireproof cable thus.These halide-free low-smoke fireproof cables comprise power cable, control cable, optical cable, line for building and data cable, be used for key project and personnel and the intensive places of equipment such as underground railway, power station, chemical plant, ships, skyscraper, information industry, along with rapid economic development, new and high technology is brought in constant renewal in, product is to high-level development, and it is trend of the times that the kind of halide-free low-smoke fireproof cable and quantity significantly increase.

Conventional electric wire is serious pollutant sources, and it can produce public hazards such as a large amount of De bioxin, lead, halide when manufacturing, use and waste treatment.In recent years, Europe, the U.S. and Japan attach great importance to the public hazards relevant with electric wire, its government not only carries out strict restriction to the emission of cables manufacturing process, and the processing of scrapping cable implemented comprehensive monitoring, force the material of the commercial compliance with environmental protection requirements of cable factory to replace traditional material, important building will ban use of polyvinyl chloride electrical wire and cable, a large amount of dense smokes when avoiding fire to take place, chlorine, cause more casualties, adopt low smoke, zero halogen cross-linking polyolefin insulation electric wire cable to become these regional local regulations, along with the increase of environmental consciousness, the application meeting of this class line progressively enlarges.

In recent years; all kinds of flame retardant cables that domestic many electric wire manufacturer is developed; mainly be not produce smog and poisonous gas when the fire after-combustion from cable that passive angle is considered; still fail to take into account simultaneously to expose to the open air and partly bear solar radiation at air; variations in temperature; fading of cable appears in wind and weather especially following of external condition effect such as ultraviolet irradiation; variable color; be full of cracks; a series of aging phenomenons such as efflorescence and intensity decreases; also has one in addition importantly; in case be difficult to protect the integrality of cable inside body part during cable breaking out of fire burning, it is uninterrupted to guarantee that promptly circuit is powered under fire condition.

The utility model content

The purpose of this utility model is to overcome the deficiencies in the prior art, a kind of environmental protection weather resistant cable is provided, it can lay and be subjected to especially operate as normal under the ultraviolet irradiation serious condition of solar radiation, variations in temperature, wind and weather in that cable is intensive, and in case fire incident occurs, under combustion case, have low smokiness and innocuousness, guarantee the uninterrupted power supply in important loop simultaneously.

In order to solve the problems of the technologies described above, environmental protection weather resistant cable described in the utility model, this cable mainly are made up of the cable conductor at center and thermal insulation layer, heat release layer and the environmental protection weather resistant oversheath that is successively set on outside the cable conductor.

Described thermal insulation layer is under extraneous flame calcination and hyperthermia radiation, can make cable isolate the conduction of external heat, especially the insulation and the inner liner portion of cable do not produce thermokarst phenomenon to protection cable body part, its conductive coefficient (normal temperature): 0.012 kcal/ (mh ℃), bearing temperature is not less than 800 ℃; The heat that heat release layer is convenient to be produced under cable self load distributes; Environmental protection weather resistant oversheath is under atmosphere and light aging effect, sample is after 42d is aging, the tensile strength of oversheath and the rate of change of percentage elongation be no more than ± and 30%, sample after 21d is aging and the contrast of the sample after 42d is aging, the tensile strength of oversheath and the rate of change of percentage elongation be no more than ± and 15%, acid gas content---bromine and chlorinity (representing with HCl) are no more than 0.5%, fluorine content---fluorine content is no more than 0.1%, pH value water is less than 4.5, and the smoke density during burning---minimum light transmittance is not less than 60%.

This cable is applicable to that cable is intensive and lays and be subjected to the especially place of external condition effect such as ultraviolet irradiation of solar radiation, variations in temperature, wind and weather.In a single day electric power, communication and electrical equipment that this place needs fire incident occurs with cable, under combustion case, should have low smokiness and innocuousness (hypotoxicity and non-corrosiveness gas produce), guarantee the uninterrupted power supply in important loop simultaneously, thereby guarantee the harm that surrounding environment, electric equipment and personnel produce be should be minimum; Expose to the open air in air part and should be able to bear the especially influence of external condition such as ultraviolet irradiation of solar radiation, variations in temperature, wind and weather, avoid occurring a series of aging phenomenons such as the fading of cable, variable color, be full of cracks, efflorescence and intensity decreases, guarantee cable safe operation in the expected time of arrival, promoted the market competition advantage of enterprise product simultaneously.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Embodiment

As shown in Figure 1, environmental protection weather resistant cable of the present utility model comprises that mainly cable conductor 1(comprises that electric power, communication and electrical equipment are with cable etc.), thermal insulation layer 2, heat release layer 3 and environmental protection weather resistant outer jacket 4.

Embodiment: WDYJH-0.6/1 4 * 25 cables

1, conductor

Monofilament meets the requirement of TR type among the GB/T3953-2009, and the conductor of cable meets the requirement of GB/T 3956-2008 standard.

Conductor structure: 7/2.14.

Direction of lay is a left-hand, stranded lay ratio ≯ 20.

2, insulation

Adopt the XLPE Insulation Material, red, green, yellow, black.

The insulation nominal value is 1.0mm, and the insulation average thickness is not less than nominal value, and the insulation average thickness is not more than nominal value, and thinnest part thickness is not less than the 90%-0.1mm of nominal value.

Percentage elongation≤175% under the crosslinked back loading insulate; Cooling back permanent elongation≤15%.

Insulated wire cores should be carried out the withstand voltage 10kV of power frequency spark and do not punctured.

3, stranding

Stranding direction dextrad, stranding lay ratio ≯ 35, insulated wire cores is arranged: red, green, yellow, black.

The cable core gap adopts the PP rope to be as the criterion to guarantee the cable rounding.

It is that the double-deck dextrad of Halogen band of 0.3mm is overlapping wrapped that cable core adopts thickness outward.

4, thermal insulation layer extrudes

Thermal insulation layer adopts special-purpose low Heat Conduction Material, and the thickness nominal value is 3.0mm, and except that the heat release layer place, thinnest part thickness is not less than the 80%-0.2mm of nominal value.

Heat release layer is arranged on thermal insulation layer, adopt special-purpose extrusion die extrusion molding, (the circular arc projection is 6 promptly at the core rod outer wall of special use the circular arc raised ribs of radial equipartition and die sleeve assembling back extrusion molding to be set, arc length 10mm, the action of arc is 2mm, and the heat of being convenient to be produced under cable self load as heat release layer distributes).

The property of insulating layer material requires: conductive coefficient (normal temperature): 0.012 kcal/ (mh ℃), bearing temperature is not less than 800 ℃.

5, outer jacket

Adopt environmental protection weather resistant protective cover material, the thickness nominal value is 1.8mm, and average thickness is not less than nominal value, and thinnest part thickness is not less than the 85%-0.1mm of nominal value.

Oversheath extrudes the back outward appearance should be closely, even, rounding, smooth, has no mechanical damage.

The above only is a preferred implementation of the present utility model.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the utility model principle, can also make some modification and improvement, these also should be considered as belonging to protection range of the present utility model.

Claims (1)

1. environmental protection weather resistant cable is characterized in that this cable is mainly by the cable conductor (1) at center and be successively set on cable conductor outer thermal insulation layer (2), heat release layer (3) and environmental protection weather resistant oversheath (4) and form.