CN201302853Y

CN201302853Y - Environment-friendly CMR-level flame-retardant coaxial cable

Info

Publication number: CN201302853Y
Application number: CNU2008201662339U
Authority: CN
Inventors: 王一群; 王永忠
Original assignee: ZHEJIANG WANMA GROUP SPECIAL ELECTRON CABLE CO Ltd
Current assignee: ZHEJIANG WANMA GROUP SPECIAL ELECTRON CABLE CO Ltd
Priority date: 2008-10-27
Filing date: 2008-10-27
Publication date: 2009-09-02
Anticipated expiration: 2018-10-27

Abstract

The utility model relates to the technical field of coaxial cables and aims to provide an environment-friendly communications riser cable (CMR)-level flame-retardant coaxial cable, which comprises, from the inside to the outside, an inner conductor, an insulating layer, an outer conductor and a protective cover in structure level. The inner conductor and the outer conductor are isolated by the insulating layer. The protective cover is coated outside the outer conductor, and the protective cover is a polyvinyl chloride protective cover. A half-extruded sealing cover is arranged on the surface of the outer conductor. Compared with the prior art, the environment-friendly CMR-level flame-retardant coaxial cable has the advantages that: (1) the environment-friendly property of the coaxial cable is excellent, the overall structure design and the material selection of the coaxial cable is realized with full consideration of the requirements for environmental protection, and the test by Shanghai SGS center shows that the coaxial cable completely conforms to the standard of The Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment (EU ROHS); and (2) the flame-retardant property of the coaxial cable is excellent; the protective cover is made of environment-friendly flame-retardant polyvinyl chloride materials and has high burning point, low risk of being decomposed, no dropping when burning and excellent flame-retardant effect; and the flame-retarding performance of the coaxial cable in integrated design can reach the CMR level.

Description

Environment-friendly type CMR level fire-retardant co-axial cable

Technical field

The utility model relates to the coaxial cable technology, specifically a kind of environment-friendly type CMR level fire-retardant co-axial cable.

Background technology

Along with The development in society and economy, being on the increase of skyscraper, people constantly promote security against fire and environmental requirement, and health perception is strengthened gradually.

In order to evaluate the fire resistance quality of cable, American National fire prevention association has issued the NEC fire-protection standard, and the NEC800 clause has been formulated all and has been installed on the fire protection requirement that the communication cable in the building must be observed 4 grades.UL has developed and has examined the method for testing whether cable meets the NEC standard, and fire resistance rating is followed successively by booster stage (CMP), main line level (CMR), bussiness class (CM), general purpose grade (CMG), household level (CMX) from high to low.

In order to satisfy the cable-flame retardant class requirement of UL regulation in the building wiring system, domestic coaxial cable manufacturer has all accelerated the research and development of fire-retardant co-axial cable.And the flame retardant rating of cable has only and satisfies CMR level or the more high-grade fire protection requirement that just can be used for vertical wirings.Grade occupy deputy CMR level cable and has perfect fire retardancy, is widely used in during main line that ventilating system separates with wiring system physically uses.CMR level cable must pass through intensive flame test: UL1666-" vertically arranged cable flame propagation is highly tested in the passage ".

Present domestic most of CMR level coaxial cable has the following disadvantages owing to extensively contain compositions such as lead, tin, bromide in design and the selection of material:

1, in the cable use, can be towards periphery environment separate out or discharge heavy metal harmful substance such as lead, pollute surrounding environment.

Produce a large amount of pernicious gases when 2, cable burns, environment and atmosphere are produced harm.

3, breaking out of fire the time, the poison gas injury is bigger, is unfavorable for evacuating personnel and rescue.

Rose in 2000, American-European countries initiates " prohibiting plumbous " motion, European Union has formulated the electronic apparatus ROHS of European Union command request, from July 1st, 2006, bans use of harmful substances such as lead, mercury, cadmium, Cr VI, PBDEs and Polybrominated biphenyl in the electronic and electrical equipment of newly putting on market.China's coaxial cable outlet is provided with technical threshold.Chinese Government also proposes the technical development policy direction and the security against fire requirement of energy-conserving and environment-protective.

Only realize cable CMR level flame-retarding characteristic or only realize the cable environmental protection characteristic that technical is not difficult especially.But it is the difficult problem of present coaxial cable technical development that exploitation simultaneously has the environment-friendly type CMR level fire-retardant co-axial cable of perfect fire retardancy and environmental protection characteristic, and domestic research in this respect is at the early-stage, yet there are no the achievement and the bibliographical information of this respect.

The utility model content

The utility model for overcoming deficiency of the prior art, provides a kind of environment-friendly type CMR level fire-retardant co-axial cable at the properties of product defective of conventional coaxial cable, is used for building vertical wiring and has satisfied the electronic apparatus ROHS of European Union instruction.

Its main design thought is as follows:

(1) design of environment-friendly high fire-retardant PVC protective cover material is selected for use;

(2) whole cable structural design and material selection guarantee cable loop guaranteed cost and high flame resistance, and guarantee the normal transmission characteristic of cable.

At the characteristics and the environment for use requirement thereof of environment-friendly type CMR level fire-retardant co-axial cable, consider that performance guarantees, factors such as the realization difficulty of technology and manufacturing cost, the utility model is achieved through the following technical solutions.

A kind of environment-friendly type CMR level fire-retardant co-axial cable, its structure is followed successively by inner wire, insulating barrier, outer conductor, sheath from inside to outside, is separated the outer conductor outer coated sheath between inner wire and the outer conductor by insulating barrier;

Sheath is a pvc sheath, the half extrusion type sealed outer conductor surface that is extruded in.

As a kind of improvement, described inner wire is the inner wire that copper product is made.

As further improvement, described insulating barrier is the insulating barrier that polythene material is made.

As further improvement, described outer conductor comprises foil shielding layer, and foil shielding layer is wrapped in the insulating barrier outer surface outward.

As further improvement, described outer conductor comprises the aluminum-magnesium alloy wire woven shield, and the aluminum-magnesium alloy wire woven shield is wrapped in the foil shielding layer outer surface outward.

As further improvement, described inner wire is the inner wire that single copper cash is made.

Relative prior art, environment-friendly type CMR level fire-retardant co-axial cable of the present utility model mainly has the following advantages:

(1) You Yi environmental-protecting performance

The overall construction design of cable and material selection have taken into full account the requirement of environmental protection index, and the cable finished product meets the electronic apparatus ROHS of European Union command request fully through the test of Shanghai SGS inspection center.

(2) good flame retardancy

Sheath selects for use the environment-friendly high fire-retardant pvc sheathing compound to make, and burning ignition point height is difficult for decomposing, and the not drip that burns, and shelling is good, the flame retardant effect excellence, and through the cable of comprehensive Design, its fire resistance can reach the fire-retardant requirement of CMR level.

Therefore, environment-friendly type CMR level fire-retardant co-axial cable has an enormous advantage and applicability with the coaxial cable tool as a kind of brand-new building level and erection system system.

In sum, the utility model is based on the environment-friendly high fire-retardant pvc sheathing compound, developed the environment-friendly type CMR level fire-retardant co-axial cable that integrates environmental protection and high flame retardant, a deficiency and a difficult problem that the traditional architecture wiring system exists with coaxial cable have been solved technically, the environmental-protecting performance and the fire resistance of this product have been improved, the requirement of having satisfied the design of building level and vertical wiring and having used.

Description of drawings

Fig. 1 is the structural representation of the utility model specific embodiment;

Fig. 2 is the technological process of production figure of the utility model specific embodiment.

Among the figure: the 1-inner wire; The 2-insulating barrier; The 3-foil shielding layer; 4-aluminum-magnesium alloy wire woven shield; The 5-sheath.

Embodiment

In conjunction with the accompanying drawings, the utility model is further described.

A kind of environment-friendly type CMR level fire-retardant co-axial cable, its structure is followed successively by inner wire 1, insulating barrier 2, outer conductor, sheath 5 from inside to outside, separates outer conductor outer coated sheath 5 by insulating barrier 2 between inner wire 1 and the outer conductor;

Sheath 5 is a pvc sheath, the half extrusion type sealed outer conductor surface that is extruded in; The insulating barrier 2 that insulating barrier 2 forms for the polythene material physical blowing.

Sketch the composition structure and the technological requirement of environment-friendly type CMR level fire-retardant co-axial cable below according to Fig. 1 and Fig. 2:

(1) inner wire 1

Inner wire 1 adopts single circular copper wire to make, and nominal diameter is 1.02mm, inner wire shall be rounded up, bright and clean, non-oxidation.

(2) insulating barrier 2

Insulating barrier 2 is the physical blowing polyethylene, adopts the high and low density polyethylene material foaming of import to form.High and low density polyethylene should meet the regulation that " GB11115-89 ldpe resin " reaches " GB 11116-89 high-density polyethylene resin ".

Insulating barrier 2 surperficial shall be rounded ups, bright and clean do not have phenomenons such as breakage, pin hole, wrinkling, bubble.That insulation foaming body abscess requires is fine and closely woven, be evenly distributed.Help improving the stable and electric property of insulating barrier 2 physical dimensions like this, make cable attenuation lower.

Insulating barrier 2 should closely be coated on inner wire 1 surface.

(3) outer conductor

Outer conductor is made of foil shielding layer 3 and aluminum-magnesium alloy wire woven shield 4, and aluminum-magnesium alloy wire woven shield 4 outer foil shielding layer 3 outer surfaces that are wrapped in, count are greater than 60%, braided wires nominal diameter 0.12-0.18mm; The foil shielding layer 3 vertical subsides insulating barriers, overlapping rate 〉=18% of packing tightly.The foil shielding layer 3 of cable is coated require smooth, corrugationless, aluminum-magnesium alloy wire woven shield 4 requires level and smooth complete coated on foil shielding layer 3 surfaces.On braiding machine, install the tension force supervising device additional, be easy to control the weaving quality of aluminum-magnesium alloy wire woven shield 4, guarantee better shield effectiveness.

(4) sheath 5

Sheath 5 adopts the high flame retardant polyvinyl chloride protective cover material that meets the ROHS of European Union command request, adopt half plsitive mold, be extruded in aluminum-magnesium alloy wire woven shield 4 outer surfaces through sealing, sheath 5 surperficial shall be rounded ups are glossy, the visible pin hole of no eyesight, slight crack, bubble and other defective allow weave pattern.Guarantee the moulding rounding property and the compactness of cable.

At last, it is also to be noted that what more than enumerate only is specific embodiment of the utility model, obviously, the utility model is not limited to above examples of implementation, and many distortion can also be arranged.All distortion that those of ordinary skill in the art can directly derive or associate from the disclosed content of the utility model all should be thought protection range of the present utility model.

Claims

1, a kind of environment-friendly type CMR level fire-retardant co-axial cable, its structure is followed successively by inner wire, insulating barrier, outer conductor, sheath from inside to outside, is separated the outer conductor outer coated sheath between inner wire and the outer conductor by insulating barrier;

It is characterized in that sheath is a pvc sheath, the half extrusion type sealed outer conductor surface that is extruded in.

2, environment-friendly type CMR level fire-retardant co-axial cable according to claim 1 is characterized in that, described inner wire is the inner wire that copper product is made.

3, environment-friendly type CMR level fire-retardant co-axial cable according to claim 1 is characterized in that, described insulating barrier is the insulating barrier that polythene material is made.

4, environment-friendly type CMR level fire-retardant co-axial cable according to claim 1 is characterized in that described outer conductor comprises foil shielding layer, and foil shielding layer is wrapped in the insulating barrier outer surface outward.

5, according to claim 1 or 4 described environment-friendly type CMR level fire-retardant co-axial cables, it is characterized in that described outer conductor comprises the aluminum-magnesium alloy wire woven shield, the aluminum-magnesium alloy wire woven shield is wrapped in the foil shielding layer outer surface outward.

6, environment-friendly type CMR level fire-retardant co-axial cable according to claim 1 and 2 is characterized in that, described inner wire is the inner wire that single copper cash is made.