JPS5929305A - Wire for controlling device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Background] The present invention uses electric power as power for remotely controlled electric measuring instruments, electric robots, unmanned cranes, etc., and transmits sensor signals, This relates to equipment control electric wires that are used by connecting to electrical equipment that sends and receives signals such as television signals and control commands.

Recently, various measuring instruments have been introduced to save labor and manpower.

Machines and instruments such as transportation and lifting equipment and processing equipment are increasingly being controlled remotely. Furthermore, due to the frequent occurrence of earthquakes in Japan, there is a need to improve prevention technology, and it has become necessary to install various geological sensors in the sea several tens of meters offshore from the land. These remote control devices and remotely installed sensors require electric power for motor power, relay circuits, etc., and signal lines are required for sending and receiving signals.

Conventionally, in order to transmit and receive such power and signals, a coaxial cable or a twisted pair control cable was often used in combination with a coated power line having plastic or rubber insulation. However, when electric signal lines are placed close to power lines, electromagnetic induction can cause signal distortion and noise, and the signal attenuation is large, making them unusable as long-distance equipment control lines. There wasn't.

However, in recent years, technological developments have been made in which signal transmission using optical fibers eliminates or completely eliminates the problem of electromagnetic induction and can be performed without repeating the signal, and various cables have been proposed.

[Prior art and problems]

As an example of a conventional power line core in which optical fibers are compositely twisted, as shown in the cross-sectional view of the conventional example in FIG.
A glass core, a cladding, a silicone resin fJa, and a nylon sheath are laminated concentrically in the grooves of a plastic or string body having U-shaped or V-shaped helical grooves 7, 8, 9, and 10. Optical fiber cores 11, 12,
13.14 is housed, compositely twisted together as an integrated unit 5, 6, and finished in a circular shape with an intervening material 15 such as a polypropylene string around the outside. A water-shielding gold m-sheath 16 is formed, which is a wrap sheath made by laminating a metal thin film and a PET (polyethylene terephthalate) sheet, and polyethylene is further applied around the outer periphery of the wrap sheath.

An anti-corrosion layer 17 made of thermoplastic plastic or elastomer such as vinyl chloride is formed into a seven-strand wobble, which is used as an electric wire for controlling equipment. Further, when the composite cable is used as an undersea cable, an armored wire layer 1B in which gold wire or reinforced plastic wire is wound in a helical shape or two around the outer periphery of the anti-corrosion layer 17 and a jute or polypropylene serving layer 19 are added. Form.

The device control electric wire formed in the conventional composite cable structure as described above has the following structural problems: (1) The electric conductor has a twisted structure, so the outer diameter is large.

(2) Since the optical fiber unit exists in the interposed part, the influence of external force on the optical fiber is large, and the optical fiber is likely to break.

(3) In the case of long lengths, the drum becomes large due to the large diameter and large quantity, which makes workability poor and installation work difficult.

(4) It costs a lot of usage fees and is uneconomical.

(5) Metal sheath for water shielding or not used for electrical transmission.

It had the following problems.

[Structure of the invention]

The present invention provides an electric wire for equipment control that has been made to solve the above-mentioned problems.The present invention is characterized by the fact that a barrier material and an optical fiber are formed on the outer periphery of a central electric conductor so that they can freely slide in the axial direction. A heavy sheathed optical fiber is wound into a spiral shape, a metal sheath that also serves as an external electrical conductor is formed on the outside of the optical fiber, and then an anti-corrosion layer is formed on the outer periphery.

〔Example〕

FIG. 2 shows a cross-sectional view of an embodiment of the device control electric wire of the present invention.

Electrical conductor 20 having the same cross-sectional area as in FIG. 1 and having an insulating coating 21
(In the case of low voltage, the insulation sheath ff121 may be omitted).A plurality of linear insulation materials 22 made of plastic wire or reinforced plastic are surrounded by a cladding 60 on the outer surface of the glass core 29 shown in FIG. Silicone resin 61. Silicone oil 63 is applied to the outer surface of a normal optical fiber core formed with a nylon sheath 62 for lubrication, and another layer of extrusion 2 is applied to the outer surface.
A double-sheathed optical fiber 26 provided with a claw sheath 34 is wound spirally, a water-shielding metal sheath 24 which also serves as an external electric conductor is formed on the outside thereof, and an anti-corrosion layer 25 is further provided.

Sky 11 around linear shield 22 and double sheathed optical fiber 23! Fill t28 with watertight compound. When this equipment control wire is used as a submarine cable or a suspension cable, an armored wire layer 26 is added on the anti-corrosion layer. Providing a serving layer 27 is a common practice.

In addition, when using the device control wire of the present invention in the deep sea, in order to avoid deformation due to external pressure, polyethylene copolymer or thermoplastic is used in the gap around the insulation material 22 and the double-sheathed optical fiber. A solid watertight compound with rubber plasticity is filled into the void 28 to prevent deformation. [Effects] The advantages of the electric wire for controlling equipment of the present invention are (1) the electrical conductors are arranged in concentric circles and the outer conductor is shielded; Since it is also used as a water metal sheath, the outer diameter of the cable is small and weight can be reduced.

Since the f21'r-pull has a small diameter and is lightweight, installation work and handling become easier.

(3) The insulation material can reduce the external force on the optical fiber from the side pressure of the cable, and even if the outer sheath is restrained by the double-sheathed fiber, the fiber core can freely slide in the axial direction, so when the cable is bent. Since it does not cause distortion, the mechanical protection of the optical fiber is reliable and it can withstand high lateral pressure.

etc.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional device control electric wire, FIG. 2 is a sectional view of a device control electric wire according to an embodiment of the present invention, and FIG. 3 is an enlarged explanatory view of the double-sheathed optical fiber in FIG. 2. 1.2. Power line, filter, 4... Insulation coating, 5, 6... Optical fiber unit, 7, 8, 9.10... U-shaped or V-shaped spiral groove, 11, 12.13 .14... Optical fiber core, 15... Interposition, 16... Metal sheath, 17... Corrosion protection layer, 18... Armor wire layer, 19...
Serving layer, 20... Electric conductor, 21... Insulating coating, 22... Linear insulation material, 26... Optical fiber, 2
4... Water-shielding metal sheath that also serves as an external conductor, 25...
- Anti-corrosion layer, 26... Armored wire layer, 27... Serving layer, 28... Void around double sheathed optical fiber 26, 29... Glass core, 60... Clad, 61
・Silicone resin, filter 2...nylon sheath, 66・silicone m, 34...extrusion, double sheath.

Claims (1)

[Claims] 1. An optical fiber with a double sheath, in which a spacer and an optical fiber are formed to freely slide in the axial direction, is spirally wound around the outer periphery of a central electric conductor, and the outer side of the optical fiber also serves as an external electric conductor. An electric wire for equipment control characterized by forming a metal sheath and further forming an anti-corrosion layer on the outer periphery. 2. Polyethylene or vinyl for the central electrical conductor. Polyurethane, tetrafluoroethylene, nylon. Polypropylene, rubber, epoxy, glass. An electric wire for controlling equipment according to claim 1, characterized in that the electric wire is coated with an organic or inorganic insulating coating made of one or more of alumina. 6. The equipment control electric wire according to claim 1 or 2, wherein the anticorrosion layer is made of extruded elastomer or thermoplastic plastic. 4. Claim 1, characterized in that the outer periphery of the anti-corrosion layer is coated with single or multiple armor made of reinforced plastic or metal wire. The device control electric wire according to item 2 or 3. 5. The metal sheath that also serves as an external electrical conductor is lead. Claim 7, characterized in that the pipe is an extruded aluminum or copper pipe, an electric resistance welded pipe, or a lap sheath.
The device control electric wire according to item 2, 3 or 3.