ES2227987T3 - ELECTRICAL CONNECTION CABLE. - Google Patents

Abstract

The connecting cable (10) holds a bundle of wires (16) and has a sleeve (18) defining an internal passage in the cable to allow insertion of supplementary wires at a later time. The initial bundle of wires (16) lies outside this internal sleeve.

Description

Electrical connection cable

The invention consists of a connection cable electric model consisting of a bundle of conductive wires initials and a sleeve that defines a step inside reserved for the installation of supplementary conductive wires.

This type of electrical connection cables are used in airplanes to connect electrically different electrical control parts These cables extend through landing gear reception compartments. They should, so Therefore, be resistant to external aggressions, since they are exposed, in these compartments, directly to the environment outside of the plane. They are also exposed to disturbances electromagnetic and external aggressions. In addition, the cables they must be flexible to allow assembly and disassembly comfortable.

In known electrical connection cables, the bundle of conductive wires is placed inside a sleeve oversized inside diameter, so that it delimits in the inside a step that allows the subsequent introduction of threads supplementary

Supplementary threads may, in effect, be necessary in case of installation of a new electrical equipment or when improvements are made to the plane.

The introduction of new threads in the step reserved delimited by the sleeve is a delicate operation, with the new threads introduced blocking frequently at mix with the initial threads. Experience shows that wires cannot be inserted into cables that have a length more than four meters. In addition, cutting boxes are planned that interrupt the cuff at regular intervals. These boxes of Cut are separated by less than four meters. They allow access to the threads that circulate inside the sleeve.

The presence of cutting boxes increases the wiring cost and hinders its installation on the trains of landing. It also reduces the electromagnetic protection of the cable, especially at high frequencies, that is, at frequencies greater than 300 kHz

In addition, the mass of the cable is important if it takes into account the large diameter of the sleeve and the presence of cutting boxes

The invention aims to provide a electrical connection cable that allows you to easily add wires supplementary conductors in large length and mass pieces reduced

A cable according to the preamble of the claim 1 has been published in GB 2 258 711 A.

For this purpose, the invention aims at a cable of electrical connection of the aforementioned type, with the wire bundle initial conductors placed on the outside of the sleeve; the wire comprises means for retaining the bundle of initial conductive wires along the sleeve, which is characterized because it is composed, at least at one end, for a tip that delimits the passage for the bundle of initial conductive wires, and the sleeve penetrates said step and ends in said step or after it.

Through particular embodiments, the connection cable has one or more of the following features:

- comprises at least one traction needle that is extends inside the sleeve;

- thread bundle retention means initial and sleeve conductors comprise a cover of external protection in which the wire bundle is housed initial conductors and the sleeve;

- the outer cover comprises, inside, a maintenance tape of the initial conductive wire bundle against the sleeve;

- the outer cover comprises a braid of electromagnetic shielding;

- the outer cover comprises a coating mechanical and / or thermal protection;

- the sleeve is delimited by a wall tubular covered by protrusions and successive grooves;

- the section of the passage delimited by the sleeve It is equal to at least 25% of the total section of the wire bundle initial drivers; Y

- the bundle of initial conductive wires and the Cuff are rolled forming a cord.

The invention will be better understood by reading the description that follows, given only by way of example and elaborated in relation to the drawings, in which:

Drawing 1 is a longitudinal sectional view of a piece of the end of a cable according to the invention; drawing 2 is a sectional view of the main part of the cable of drawing 1.

In drawing 1 a piece of end 10 of an electrical connection cable according to the invention. It comprises at the end a conduit 12 that ensures the relationship mechanics of the cable with a wall 14 of the electrical equipment to which it is connected the cable 10.

The cable 10 comprises a bundle 16 of wires initial conductors and a sleeve 18 that delimits inside a step reserved for the subsequent installation of conductive wires supplementary

The beam 16 of initial conductive wires is extends outwardly along the sleeve 18. The sleeve and the tube are held against each other by a cover multilayer external 20.

The beam 16 is formed by wiring wires isolated and eventually armored, consisting of a single thread or even two or three twisted threads. These threads are distributed partially around sleeve 18, concentrated in the same side, as depicted in drawing 2. They also delimit, in cut, a space in the shape of a crescent.

As an advantage to improve the flexibility of cable, the set formed by the beam 16 of conductive wires and the sleeve 18 is rolled to form a cord. Beam 16 and sleeve 18 describe interlocking propellers.

The sleeve 18 is constituted by a tube ringed. Thus, there is an alternation of cylindrical pieces of Different diameters throughout. More generally, sleeve 18 it has the advantage of being bounded along a wall tubular with protrusions and successive grooves.

Preferably, the inner section of the sleeve 18 is 0.25 times higher than the section of the beam 16 of wires initial drivers

The sleeve 18 is made of PTFE (Polytetrafluoroethylene) or in PEEK (Polyteteracetone). Cover 20 which ensures protection and retention of beam 16 and sleeve 18 comprises an inner covering 22 formed by a tape of PTFE or polyester. The tape is helically wound with a 50% coating around beam 16 and sleeve 18. The tape 22 avoids the use of conductive wires and ensures its cohesion when the cable is manufactured and especially when place other layers of cover 20.

In a variant, the tape that constitutes the coating 22 is arranged longitudinally around the beam 16 and sleeve 18, with the longitudinal edges of the tape placed on top of each other with a coating greater than one 30%

The cover 20 also includes glued around the inner layer 22, a shield braid 24 that ensures the electromagnetic protection of the cable with respect to experienced disturbances around it.

The shield braid 24 is formed by example, by round strands of nickel-plated copper braided between they.

The shield braid is made by example, with overdrawn. As a variation, the beam 16 and the sleeve 18 wrapped by the tape are strung in the armor braid 24, previously manufactured.

The cover 20 comprises on the outside a 26 mechanical protection coating. This is constituted by for example, by a textile braid or a heat shrinkable coating, for example done in NOMEX. The NOMEX is marketed by the Du Pont de Nemours company.

On the other hand, a pulling needle 28 is in principle placed inside the sleeve 18, which ends in its two extremes

This traction needle allows the introduction back of supplementary conductive wires from one end, joining them to the traction needle. The traction of the needle from the opposite end allows conductive wires added to the sleeve length 18.

As shown in drawing 1, the cable connection 10 comprises at its end a conduit 12 that delimits a step 30 for the bundle of conductive wires 16. Beam 16 and the sleeve 18 surrounded by tape penetrate step 30 and end beyond said step. In particular, sleeve 18 penetrates said passage and ends in it or something beyond, allowing the introduction of supplementary conductive wires through sleeve 18 from the interior of the equipment delimited by the wall 14.

The mechanical protection coating 26 and the shield braid 24 are interrupted on conduit 12 which partially cover. The coating 26 and the braid 24 are electrically and mechanically linked to conduit 12 with pieces successive stages 32 and 34, on which the coating and braid.

With a connection cable like the one described here, supplementary threads can be introduced later with ease in sleeve 18 without risk of blockage and mixing with the initial conductive wires that constitute the beam 16.

In this way, the electrical connection cables they can reach lengths of 10m without cutting box, allowing the same time add extra threads.

The cable described herein comprises a conduit 12 which ensures the union of the cable with the electrical equipment box. As a variation, the cable comprises a connector and the sleeve 18 it ends, therefore, advantageously, inside the box of the connector.

More generally, the cable comprises at least one extreme, a piece that delimits a step; sleeve 18 ends in said step or something beyond.

Claims (9)

1. Electrical connection cable (10), comprising a beam (16) of initial conductive wires and a sleeve (18) that internally delimit a reserved passage for the installation of supplementary conductive wires, with the bundle (16) of conductive wires initials placed on the outside of the sleeve (18), the cable (10) with means (20) for retaining the bundle (16) of initial conductive wires along the sleeve (18), characterized by the fact that it comprises, at less at one end, a quarry (12) that delimits a passage (30) for the bundle (16) of initial conductive wires, with the sleeve (18) penetrating said passage (30) and ending in step (30) or beyond it. 2. Cable according to claim 1, characterized in that it comprises at least one tension needle (28) extending inside the sleeve (18). 3. Cable according to claim 1 or 2, characterized in that the beam retention means (16) of the initial conductive wires and the sleeve (18) comprise an external protective cover (20) in which they are located the bundle (16) of initial conductive wires and the sleeve (18). Cable according to claim 3, characterized in that the outer cover (20) comprises, inside, a tape (22) for maintaining the bundle (16) of initial conductive wires against the sleeve (18). 5. Cable according to claim 3 or 4, characterized in that the outer cover (20) comprises an electromagnetic shield braid (24). 6. Cable according to any of claims 3 to 5, characterized in that the outer sheath (20) comprises a mechanical (26) and / or thermal protective coating. Cable according to any one of the preceding claims, characterized in that the sleeve (18) is delimited by a tubular wall that comprises successive projections and grooves along. Cable according to any of the preceding claims, characterized in that the passage section delimited by the sleeve (18) is equal to at least 25% of the total beam section (16) of the initial conductive wires. 9. Cable according to any of the preceding claims, characterized in that the beam (16) of the conductive wires and the sleeve (18) are wound forming a cord.