CN101404350A - Broad band radiation type leak coaxial cable for subway and its production method - Google Patents
Broad band radiation type leak coaxial cable for subway and its production method Download PDFInfo
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- CN101404350A CN101404350A CNA200810235151XA CN200810235151A CN101404350A CN 101404350 A CN101404350 A CN 101404350A CN A200810235151X A CNA200810235151X A CN A200810235151XA CN 200810235151 A CN200810235151 A CN 200810235151A CN 101404350 A CN101404350 A CN 101404350A
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Abstract
The invention relates to a broadband radial pattern leaky coaxial cable used for subway and a manufacturing method thereof, and the leaky coaxial cable has the double functions of transmission line of information and duplexer. The structure of the leaky coaxial cable consists of an inner conductor, an insulation layer, an outer conductor and a jacket, wherein, the inner conductor is externally covered with the insulation layer which is externally covered with the outer conductor that is externally sheathed with the jacket, and the insulation layer that covers on the surface of the inner conductor adopts nitrogen or carbon dioxide physical foam to form a foamed polyethylene insulation layer; cambered slotted holes are opened on a clutch gold belt of the outer conductor covered outside the insulation layer. The manufacturing method comprises the steps: (1) a spiral wrinkle inner conductor is manufactured by longitudinal covering welding and embossing by using a copper strip; (2) the nitrogen or the carbon dioxide are adopted to be injected into the smelted polyvinyl plastics, and then the physical foamed polyethylene insulation layer is formed on the surface of the inner conductor by extrusion and cladding; (3) the slotted holes broken out by the clutch gold belt of the outer conductor are the cambered slotted holes; (4) the clutch gold belt of the outer conductor is covered on the insulation layer longitudinally, and the surface of the clutch gold belt of the outer conductor is crowded and covered with the jacket.
Description
Technical field
What the present invention relates to is a kind of broad band radiation type leak coaxial cable for subway and preparation method thereof, has the dual-use function of transmission line of information and dual-mode antenna.Be specifically designed to subway tunnel wireless shrouding system such as Tetra, public security fire-fighting, GSM, TD-SCDMA etc.
Background technology
Mobile communication is through 10 years of development, and for users, the whole mobile communications network of active demand reaches the seamless covering of high speed whenever and wherever possible.Along with information communication, multimedia wideling popularize, people also have higher requirement to business, wish to have the selection of multiple business, the expectation of high-speed data service movement requirement is also more and more higher, the function of 3G is the application of high-speed data and multimedia service, and high speed data services such as visual telephone, video flowing, recreation all occur in the indoor environment, indoor in current city, as occasions such as subway, building, underground parkings, complex structure, the electromagnetic wave signal of outside are difficult to transmission and come in.Indoor comprehensive soverlay technique is a kind of effective measures that solve indoor seamless communication, also is the key technology of promoting as China 3G high-speed data service at present, and the traffic carrying capacity 90% of adding up TD-SCDMA according to authority occurs in indoor.
Indoor covering is exactly in indoor construction wireless network transmission system, the complete system of a cover such as transmission, transmission and reception that comprises indoor signal, current indoor environment is comparatively complicated, the one, the multiple together standard of 2G and 3G exists simultaneously, signal as GSM, CDMA, TD-SCDMA, WCDMA, CDMA2000 etc. and relevant public security fire-fighting system can be simultaneously in indoor propagation, indoor covering design is had higher requirement, need to solve critical problems such as covering, interference and capacity.The scheme of present indoor covering has several, as antenna+feeder line wiring system scheme and leaky cable antenna wiring system scheme.The scheme of antenna+feeder line exists and covers incomplete defective, particularly in the tunnel, subway, etc. narrow zone relatively, the size of antenna is subjected to strict restriction, causes antenna gain can't reach the needs that field intensity covers.Broad band radiation type leak coaxial cable for subway has advantages such as interference is little, capacity big, the field intensity covering is even, designs at the subway tunnel environment specially, satisfies the demand of subway 2G, 3G wireless coverage fully.
Summary of the invention
A kind of broad band radiation type leak coaxial cable for subway that provides at above-mentioned weak point and preparation method thereof is provided, it is broadband radiation type leaky coaxial cable of a kind of subway tunnel special use and preparation method thereof, have disturb little, capacity big, field intensity covers uniform characteristics, design at the subway tunnel environment specially, through analogue test, satisfy the demand of subway 2G, the covering of 3G WiMAX fully at the subway environment.
Broad band radiation type leak coaxial cable for subway and preparation method thereof is to take following scheme to realize: broad band radiation type leak coaxial cable for subway is made up of inner wire, insulating barrier, outer conductor and sheath, at inner wire outsourcing insulating layer coating, be coated with outer conductor at insulating barrier, at the outer conductor overcoat sheath is housed, it is characterized in that adopting purity at the surface coated insulating barrier of inner wire is 99.99% nitrogen or carbon dioxide physically foamed formation polyethylene foamed insulating barrier, have uniform foaming pore, the foaming pore seals mutually; Have arc-shaped slot on the outer conductor Copper Foil band that coats outside insulating barrier, the flute length of described arc-shaped slot is 100 ± 2mm, and radian is 10 ± 1 degree, and the pitch of slotted eye is 220 ± 2mm, and the width of slotted eye is 5.1 ± 0.5mm.
Described inner wire adopts the copper strips process to be welded into copper pipe after embossing constitutes spirality wrinkle inner wire; Described outer conductor adopts the vertical bag of the Copper Foil band that has arc-shaped slot to constitute; Described sheath adopts polyolefin or fire retardant polyolefin to squeeze and protects formation.
Broad band radiation type leak coaxial cable for subway is owing to be 99.99% nitrogen or carbon dioxide physically foamed formation polyethylene foamed insulating barrier at the surface coated insulating barrier of inner wire through purity, has uniform foaming pore and electric property preferably.Owing to have arc-shaped slot on the outer conductor Copper Foil band that outside insulating barrier, coats, slotted eye by this novel uniqueness, a part of electromagnetic energy of transmission can be sent to external environment in the cable, equally, outside energy also can be imported cable inside into by this slotted eye, such structure just can realize the function of receiving and transmitting signal on cable, the function of current collection cable, antenna is in one, the grooved of this kind structure is suitable for the subway tunnel environment, have characteristics such as electromagnetic wave is concentrated relatively on the radiation direction, field intensity is even, satisfy the demand that subway wireless network broadband covers.
The manufacture method of broad band radiation type leak coaxial cable for subway:
1, select for use copper strips to be welded into copper pipe after the embossing integration system is produced the spirality wrinkle inner wire that adheres to specification through vertical bag; Described copper strips thickness is 0.3mm～0.4mm;
2, adopting purity is that 99.99% nitrogen or carbon dioxide inject the vinyon of melting with the high pressure of 350bar, under 180 ℃～200 ℃ high temperature, fully mix, and carry out physical blowing, extrude through extrusion molding material machine then and be coated on formation physically foamed pe insulation layer on the inner wire surface; Described vinyon and the purity stated is that 99.99% nitrogen or carbon dioxide weight proportion are 100: 6～20;
3, outer conductor adopts the Copper Foil band, carries out automatic punching able to programme earlier on the Copper Foil band, and the slotted eye of going out is an arc-shaped slot; The flute length of described arc-shaped slot is 100 ± 2mm, and radian is 10 ± 1 degree, and the pitch of slotted eye is 220 ± 2mm, and the width of slotted eye is 5.1 ± 0.5mm;
4, will be towards the vertical surface of insulating layer that is coated on of the outer conductor Copper Foil band of grooved hole, vertical bag squeezes and protects integratedly, and conductor Copper Foil belt surface squeezes through extrusion molding material machine and covers polyolefin or flame-retardant polyolefin sheathed outside; Described Copper Foil tape thickness is 0.1mm～0.2mm.
The characteristics of broad band radiation type leak coaxial cable for subway and preparation method thereof:
1, physically foamed pe insulation layer of the present invention, because the method for injecting nonpolar nitrogen or carbon dioxide is adopted in the generation of foaming pore, the foaming pore remains evenly, sealing mutually, the electric capacity uniformity;
2, no burn into waterproof, protection against the tide, good airproof performance;
3, slotted eye is even on the outer conductor, physical dimension control is accurate, and the voltage standing wave ratio of cable is low, power capacity is high and bending property is good;
4, foam degrees height, the cable footpath is little, has reduced cost and has been convenient to construction;
5, working band is wide, can reach between 100MHz-3000MHz, and it is even that signal output covers field intensity, disturbs for a short time, and capacity is big.
Description of drawings
The invention will be further described below with reference to accompanying drawing.
Fig. 1 is the broad band radiation type leak coaxial cable for subway structural representation.
Fig. 2 is a slotted eye schematic diagram on the outer conductor of broad band radiation type leak coaxial cable for subway.
Among the figure, 1, inner wire 2, insulating barrier 3, slotted eye 4, outer conductor 5, sheath
Embodiment
With reference to accompanying drawing 1,2, broad band radiation type leak coaxial cable for subway comprises inner wire 1, insulating barrier 2, outer conductor 4 and sheath 5, at inner wire 1 outsourcing insulating layer coating 2, be coated with outer conductor 4 at insulating barrier 2, outside outer conductor 3, be set with sheath 5, it is characterized in that adopting purity at the surface coated insulating barrier 2 of inner wire 1 is 99.99% nitrogen or carbon dioxide physically foamed formation polyethylene foamed insulating barrier, have uniform foaming pore, the foaming pore seal mutually, have electric property preferably.Have arc-shaped slot 3 on the outer conductor 4 Copper Foil bands that coat outside insulating barrier 2, have arc-shaped slot 3 on outer conductor 4, the flute length of arc-shaped slot 3 is 100 ± 2mm, and radian is 10 ± 1 degree, and the pitch of slotted eye is 220 ± 2mm, and the width of slotted eye is 5.1 ± 0.5mm;
Described inner wire 1 adopts copper strips to be welded into copper pipe after embossing constitutes spirality wrinkle inner wire through vertical bag; Described outer conductor adopts the vertical bag of the Copper Foil band that has arc-shaped slot to constitute; Described sheath adopts polyolefin or fire retardant polyolefin to squeeze and protects formation.
The manufacture method embodiment 1 of broad band radiation type leak coaxial cable for subway:
1, select for use the copper strips of thickness 0.3mm to be welded into copper pipe after the embossing integration system is produced the spirality wrinkle inner wire 1 that external diameter is Φ 17.4 ± 0.1mm through vertical bag;
2, adopting purity is that 99.99% nitrogen or carbon dioxide inject the polyethylene insulation body of melting by the high pressure of 350bar, under 180 ℃ of high temperature, fully mix, and carry out physical blowing, extrude then and be coated on upward formation insulating barrier 2 of inner wire 1 surface, its insulating barrier 1 has uniform foaming pore, the foaming pore seals mutually, the foaming conductor assembly outer diameter is even, consistent, and foam degrees reaches 80%, and electric capacity stably is controlled in 77 ± 1pF/m scope;
3, outer conductor 4 adopts the Copper Foil band, allow the Copper Foil band carry out automatically-controlled continuous able to programme earlier on special-purpose punch press and go out uniform arc-shaped slot 3, the flute length of arc-shaped slot 3 is 100 ± 2mm, and radian is 10 ± 1 degree, the pitch of slotted eye is 220 ± 2mm, and the width of slotted eye is 5.1 ± 0.5mm;
4, have arc-shaped slot outer conductor 4 Copper Foil bands to be coated on insulating barrier 1 surface above-mentioned dash with mould is vertical, indulge bag squeeze protect integrated, on outer conductor 4 surfaces through crowded polyolefin or flame-retardant polyolefin sheathed 5 covered of extrusion molding material machine; Described Copper Foil tape thickness is 0.1mm.
The manufacture method embodiment 2 of broad band radiation type leak coaxial cable for subway:
1, the copper strips of selecting thickness 0.35mm for use is welded into copper pipe embossing integration system through vertical bag and produces the spirality wrinkle inner wire 1 that external diameter is Φ 17.4 ± 0.1mm;
2, adopting purity is that 99.99% nitrogen or carbon dioxide inject the polyethylene insulation body of melting by the high pressure of 350bar, under 190 ℃ of high temperature, fully mix, and carry out physical blowing, extrude then and be coated on upward formation insulating barrier 2 of inner wire 1 surface, its insulating barrier 1 has uniform foaming pore, the foaming pore seals mutually, the foaming conductor assembly outer diameter is even, consistent, and foam degrees reaches 80%, and electric capacity stably is controlled in 77 ± 1pF/m scope;
3, outer conductor 4 adopts the Copper Foil band, allow the Copper Foil band carry out automatically-controlled continuous able to programme earlier on special-purpose punch press and go out uniform arc-shaped slot 3, the flute length of arc-shaped slot 3 is 100 ± 2mm, and radian is 10 ± 1 degree, the pitch of slotted eye is 220 ± 2mm, and the width of slotted eye is 5.1 ± 0.5mm;
4, have arc-shaped slot outer conductor 4 Copper Foil bands to be coated on insulating barrier 1 surface above-mentioned dash with mould is vertical, indulge bag squeeze protect integrated, on outer conductor 4 surfaces through crowded polyolefin or flame-retardant polyolefin sheathed 5 covered of extrusion molding material machine; Described Copper Foil tape thickness is 0.15mm.
The manufacture method embodiment 3 of broad band radiation type leak coaxial cable for subway:
1, the copper strips of selecting thickness 0.4mm for use is welded into copper pipe embossing integration system through vertical bag and produces the spirality wrinkle inner wire 1 that external diameter is Φ 17.4 ± 0.1mm;
2, adopting purity is that 99.99% nitrogen or carbon dioxide inject the polyethylene insulation body of melting by the high pressure of 350bar, under 200 ℃ of high temperature, fully mix, and carry out physical blowing, extrude then and be coated on upward formation insulating barrier 2 of inner wire 1 surface, its insulating barrier 1 has uniform foaming pore, the foaming pore seals mutually, the foaming conductor assembly outer diameter is even, consistent, and foam degrees reaches 80%, and electric capacity stably is controlled in 77 ± 1pF/m scope;
3, outer conductor 4 adopts the Copper Foil band, allow the Copper Foil band carry out automatically-controlled continuous able to programme earlier on special-purpose punch press and go out uniform arc-shaped slot 3, the flute length of arc-shaped slot 3 is 100 ± 2mm, and radian is 10 ± 1 degree, the pitch of slotted eye is 220 ± 2mm, and the width of slotted eye is 5.1 ± 0.5mm;
4, have arc-shaped slot outer conductor 4 Copper Foil bands to be coated on insulating barrier 1 surface above-mentioned dash with mould is vertical, indulge bag squeeze protect integrated, on outer conductor 4 surfaces through crowded polyolefin or flame-retardant polyolefin sheathed 5 covered of extrusion molding material machine; Described Copper Foil tape thickness is 0.2mm.
Broad band radiation type leak coaxial cable for subway outer conductor of the present invention adopts the camber perforate, and the function that reach is exactly mainly to realize following three functions in any point of the route of its process: a) transmission electromagnetic wave in the cable; B) outside launching electromagnetic wave; C) receive the specific electromagnetic wave in outside; D) can realize that the wireless system broadband of private network 2G, 3G covers at the subway tunnel environment, energy is concentrated relatively on the electromagenetic wave radiation direction, field intensity is even, and have disturb little, advantage capacious.
The broad band radiation type leak coaxial cable for subway product is through detecting Specifeca tion speeification: consume and be 65dB; The transmission speed ratio is 89%.Adopt the continuous or automatic control of interruption punching technology able to programme, and vertical bag-wrapped-sheath integral production technology, the standing-wave ratio of using frequency range is less than 1.2, and working band is wide, can reach between 100MHz-3000MHz, satisfy the demand of subway 2G, the covering of 3G WiMAX fully.
Claims (5)
1, a kind of broad band radiation type leak coaxial cable for subway, form by inner wire, insulating barrier, outer conductor and sheath, at inner wire outsourcing insulating layer coating, be coated with outer conductor at insulating barrier, at the outer conductor overcoat sheath is housed, it is characterized in that adopting purity at the surface coated insulating barrier of inner wire is 99.99% nitrogen or carbon dioxide physically foamed formation polyethylene foamed insulating barrier, have uniform foaming pore, the foaming pore seals mutually; Have arc-shaped slot on the outer conductor Copper Foil band that coats outside insulating barrier, the flute length of described arc-shaped slot is 100 ± 2mm, and radian is 10 ± 1 degree, and the pitch of slotted eye is 220 ± 2mm, and the width of slotted eye is 5.1 ± 0.5mm.
2, broad band radiation type leak coaxial cable for subway according to claim 1 is characterized in that described inner wire adopts the copper strips process to be welded into copper pipe after embossing constitutes spirality wrinkle inner wire.
3, broad band radiation type leak coaxial cable for subway according to claim 1 is characterized in that described outer conductor adopts the vertical bag of the Copper Foil band that has arc-shaped slot to constitute.
4, broad band radiation type leak coaxial cable for subway according to claim 1 is characterized in that described sheath adopts polyolefin or fire retardant polyolefin to squeeze and protects formation.
5, the manufacture method of the described broad band radiation type leak coaxial cable for subway of claim 1 is characterized in that:
(1) select for use copper strips to be welded into copper pipe after the embossing integration system is produced spirality wrinkle inner wire through vertical bag; Described copper strips thickness is 0.3mm～0.4mm;
(2) adopting purity is that 99.99% nitrogen or carbon dioxide inject the vinyon of melting with the high pressure of 350bar, under 180 ℃～200 ℃ high temperature, fully mix, and carry out physical blowing, extrude through extrusion molding material machine then and be coated on formation physically foamed pe insulation layer on the inner wire surface; Described vinyon and purity are that 99.99% nitrogen or carbon dioxide weight proportion are 100: 6～20;
(3) outer conductor adopts the Copper Foil band, carries out automatic punching able to programme earlier on the Copper Foil band, and the slotted eye of going out is an arc-shaped slot; The flute length of described arc-shaped slot is 100 ± 2mm, and radian is 10 ± 1 degree, and the pitch of slotted eye is 220 ± 2mm, and the width of slotted eye is 5.1 ± 0.5mm;
(4) with the vertical surface of insulating layer that is coated on of above-mentioned outer conductor Copper Foil band towards grooved hole, vertical bag squeezes and protects integratedly, and conductor Copper Foil belt surface squeezes through extrusion molding material machine and covers polyolefin or flame-retardant polyolefin sheathed outside; Described Copper Foil tape thickness is 0.1mm～0.2mm.
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| CN2385411Y (en) * | 1999-02-12 | 2000-06-28 | 天津经济技术开发区东源实业公司 | Leakage coaxial cable |
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