CN214313588U - Cable terminal - Google Patents

Abstract

The utility model relates to a cable termination. The cable termination includes: the cable comprises a cable, wherein a corrugated metal sheath is arranged outside a conductor core of the cable, and a groove is formed on the outer surface of the corrugated metal sheath; and a tail pipe, an end of which is mounted to the corrugated metal sheath and which is electrically connected to the corrugated metal sheath via a plurality of conductive braided wires, one end of which is fixed to the tail pipe and the other end of which is fixed to the corrugated metal sheath via a fastener. The cable termination further comprises a conductive gasket disposed between said other end of the conductive braided wire and the corrugated metal sheath, wrapped in the groove of the corrugated metal sheath, and having an outer surface flush with the outer surface of said corrugated metal sheath. According to the utility model discloses a cable termination can realize that the tail pipe need not to carry out complicated welding process with the reliable electricity between the wrinkle metal sheath of cable and be connected with mechanical connection, has avoided because damage and the trouble that welding process caused.

Description

Cable terminal

Technical Field

The utility model relates to a power cable field, more specifically, the utility model relates to a cable termination.

Background

The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

The cable terminal is used for connecting a power cable line to various electrical equipment of a user to realize power transmission, generally has good electrical performance and mechanical performance, and is widely applied to various fields of power, petrochemical industry, metallurgy and the like. Cable terminations typically include cables, tail pipes and other accessories. The exterior of the conductor core of the cable is typically wrapped with a corrugated metal jacket to provide protection to the cable. A corrugated aluminum jacket is a corrugated metal jacket commonly used in electrical cables. A tail pipe is mounted at one end of the cable for securing the cable in place. In order to meet the relevant regulations for electrical safety, the corrugated metal sheath is usually grounded, and the tail pipe is grounded by being connected to the corrugated metal sheath. In existing cable termination structures, after one end of the cable is passed through the tail tube, the tail tube is typically secured in place with a corrugated metal jacket connection using a soldering process (e.g., a lead-enameling process) to achieve both electrical and mechanical connection therebetween. However, there are several disadvantages to this way of connecting the tailpipe to the corrugated metal jacket. On the one hand, the welding of the tail pipe and the corrugated metal sheath is complex, and once the welding operation is not performed properly, the cable is easily damaged, for example, the insulating layer of the cable is damaged, and the reliability of the cable is affected, so that the requirement on operators is high on the installation site of the cable terminal. In addition, in the use process of the cable terminal, the welding part between the tail pipe and the corrugated metal sheath is easy to crack, so that the connection between the tail pipe and the corrugated metal sheath is failed, and the use of the cable is influenced.

Therefore, improvements in the connection of the tail pipe to the corrugated metal sheath are desired.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve above-mentioned technical problem, realize the tail pipe at cable termination and the reliable connection between the wrinkle metal sheath.

An aspect of the present invention is to provide a cable terminal. The cable termination includes: the cable comprises a cable, wherein a corrugated metal sheath is arranged outside a conductor core of the cable, and a groove is formed on the outer surface of the corrugated metal sheath; and a tail pipe having an end portion mounted to the corrugated metal sheath and electrically connected with the corrugated metal sheath via a plurality of conductive braided wires, wherein one ends of the plurality of conductive braided wires are fixed to the tail pipe and the other ends of the plurality of conductive braided wires are fixed to the corrugated metal sheath via a fastener. The cable termination further includes a conductive gasket disposed between the other ends of the plurality of conductive braided wires and the corrugated metal sheath, the conductive gasket being wound in the groove of the corrugated metal sheath, and an outer surface of the conductive gasket being flush with an outer surface of the corrugated metal sheath.

In one embodiment, the cable termination further comprises a first shield portion and a second shield portion. A first protector is formed at a fixing portion between the other ends of the plurality of conductive braided wires and the corrugated metal sheath to wrap the other ends of the plurality of conductive braided wires and the fastener to the corrugated metal sheath. The second protection part is formed at the mounting part between the end of the tail pipe and the corrugated metal sheath to wrap the end of the tail pipe to the corrugated metal sheath.

In one embodiment, a conductive gasket is also disposed between the end of the tailpipe and the corrugated metal jacket, wrapped in the groove of the corrugated metal jacket.

In one embodiment, the grooves extend helically in the axial direction of the corrugated metal sheath.

In one embodiment, the conductive pads extend from the fixing portion along the groove to the mounting portion between the end of the tailpipe and the corrugated metal sheath.

In one embodiment, the first protective part and/or the second protective part is formed by winding an epoxy resin glass ribbon.

Preferably, the outer surface of the conductive gasket is formed with a plurality of sharp portions adapted to be inserted into the plurality of conductive braided wires.

It is further preferred that the cross-sectional profile of the conductive pad matches the cross-sectional profile of the groove and/or that a side surface of the conductive pad, which is received in the groove, is formed with a plurality of sharp portions.

The fastener is made of a non-magnetic or micro-magnetic material and is selected from any one of the following: constant force spring, clamp, ribbon.

In one embodiment, the corrugated metal sheath is a corrugated aluminum sheath.

The utility model discloses a cable termination adopts electrically conductive braided wire to realize the electricity between the wrinkle metal sheath of tail pipe and cable and is connected to use electrically conductive gasket to convolute the recess on the surface with filling out wrinkle metal sheath on the wrinkle metal sheath of cable, use the fastener to fix electrically conductive braided wire to wrinkle metal sheath, can realize reliable electricity between the wrinkle metal sheath of tail pipe and cable and be connected and mechanical connection, and need not to carry out complicated welding process, avoided because damage and the trouble that welding process caused.

Drawings

Embodiments of the invention will be described below, by way of example only, with reference to the accompanying drawings. In the drawings, like features or components are designated with like reference numerals, and the drawings are not necessarily drawn to scale, and wherein:

fig. 1 illustrates a perspective view of a related art cable terminal;

fig. 2 shows a perspective view of a partial structure of a cable termination according to the present invention;

fig. 3 shows a perspective view of a cable termination according to the invention;

fig. 4 shows a perspective view of the conductive gasket of the cable termination in fig. 3;

FIG. 5 shows a cross-sectional view of the conductive gasket of FIG. 4; and

fig. 6 and 7 show an assembly process of the cable termination in fig. 3.

Detailed Description

The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses. It should be understood that throughout the drawings, like reference numerals indicate like or similar parts and features. The drawings are only schematic representations of the concepts and principles of the embodiments of the present invention, and do not necessarily show the specific dimensions and proportions of the various embodiments of the present invention. Certain features that are in certain figures may be shown exaggerated in detail in order to illustrate relevant details or structures of embodiments of the invention.

In the description of the various embodiments of the present invention, the directional terms used in connection with "up," "down," "left," "right," "front," "back" and the like are used in the up, down, left, right, front, and back orientations of the wearer.

Fig. 1 shows a perspective view of a related art cable terminal. As shown in fig. 1, the cable terminal 1 includes a cable 10 and a tail tube 20. The cable 10 includes a corrugated aluminum jacket 11, and the corrugated aluminum jacket 11 encloses the conductor core, the shielding layer, the insulating layer, the water blocking layer (not visible in fig. 1), and the like of the cable 10 to provide a protective function to the cable 10. The corrugated aluminum sheath 11 extends spirally in the axial direction (X direction in fig. 1), and has a spiral groove 13 formed on the outer surface. To meet the relevant regulations for electrical safety, the corrugated aluminum sheath 11 is grounded. A tail pipe 20 is installed at one end of the corrugated aluminum sheath 11. The tail pipe 20 includes a pipe body 21 and a fixed attachment 23. One end of the pipe body portion 21 of the tail pipe 20 is fitted over one end of the corrugated aluminum sheath 11 and is welded to the corrugated aluminum sheath 11 using a lead-lined welding process to be grounded by being electrically connected to the corrugated aluminum sheath 11. The fixing mount 23 of the tail pipe 20 is a flange extending from the other end of the body portion 21, and is provided with a plurality of mounting holes for fixing the cable 10 wrapped with the corrugated aluminum sheath 11 in place.

When the tail pipe 20 is welded to the corrugated aluminum sheath 11, the welding process is complicated, and the groove 13 is formed on the outer surface of the corrugated aluminum sheath 11, which increases the welding difficulty, and if cooling is not performed in time, the welding heat may easily damage the structure (e.g., insulating layer, water-blocking layer, shielding layer) inside the corrugated aluminum sheath 11. In addition, during the use of the cable terminal 1, the welding portion 15 formed between the tail pipe 20 and the corrugated aluminum sheath 11 is easily cracked, the connection between the tail pipe 20 and the corrugated aluminum sheath 11 is loosened, the electrical connection is not reliable, the grounding of the cable terminal 1 is not reliable, a voltage is generated between the tail pipe 20 and the corrugated aluminum sheath 11, gap discharge is generated, and finally, a fault is generated, thereby affecting the use of the cable terminal 1.

Therefore, the utility model provides a new cable termination to solve above-mentioned technical problem. Fig. 2 shows a perspective view of a partial structure of the cable termination 2 according to the present invention. The cable termination 2 according to the present invention has substantially the same construction as the cable termination 1 shown in fig. 1, except for the connection between the tail tube and the corrugated aluminum sheath. Therefore, in the drawings and hereinafter, the same components are denoted by the same reference numerals, and the corresponding descriptions are omitted. The following will mainly be explained about the differences between the cable termination 2 and the cable termination 1.

As shown in fig. 2, the cable termination 2 includes a cable 10 and a tail tube 20. The tail tube 20 is connected to the corrugated aluminum sheath 11 of the cable 10 via a plurality of conductive braided wires 30. One end of the conductive braided wire 30 is fixed to the body portion 21 of the tail pipe 20, for example, to the inner wall of the body portion 21. The other end of the conductive braided wire 30 is fixedly connected to the corrugated aluminum sheath 11, for example, in a bundling manner. The conductive braided wire 30 may be, for example, a copper conductive braided wire twisted from a plurality of strands of fine copper wires. By replacing the lead-lined soldering process with this connection fixing manner of the cable 10 and the tail pipe 20, the above-mentioned problems due to the lead-lined soldering process can be avoided.

In addition, as shown in fig. 2, since the groove 13 is formed on the outer surface of the corrugated aluminum sheath 11, it is inconvenient to stably bind and fix the conductive braided wire 30 to the corrugated aluminum sheath 11. For this reason, as shown in fig. 3, the cable terminal 2 according to the present invention further includes a conductive gasket 40 wound on the corrugated aluminum sheath 11, the conductive gasket 40 being accommodated in the groove 13 to provide a substantially smooth connection surface for the conductive braided wire 30 and the corrugated aluminum sheath 11, so as to reliably fix the end of the conductive braided wire 30 on the corrugated aluminum sheath 11, thereby achieving a reliable connection between the tail pipe 20 and the corrugated aluminum sheath 11. Fig. 3 shows that the conductive pad 40 extends from a fixed portion between the end portion of the conductive braided wire 30 and the corrugated aluminum sheath 11 to a mounting portion between the pipe body portion 21 of the tail pipe 20 and the corrugated aluminum sheath 11. It should be noted here that the conductive pad 40 may be provided only at the fixing portion between the end portion of the conductive braided wire 30 and the corrugated aluminum sheath 11, and does not extend to the mounting portion between the pipe body portion 21 of the tail pipe 20 and the corrugated aluminum sheath 11.

Fig. 4 shows a perspective view of the conductive pad 40. As shown in fig. 4, the conductive pad 40 extends in a spiral form in the axial direction (X direction in fig. 4). The conductive pad 40 is wound on the corrugated aluminum sheath 11, specifically, in the spiral groove 13 on the outer surface of the corrugated aluminum sheath 11. The cross-section of the conductive pad 40 substantially conforms to the contour of the groove 13 of the corrugated aluminum sheath 11 such that when the conductive pad 40 is wrapped in the groove 13 of the corrugated aluminum sheath 11, the conductive pad 40 fills the groove 13 and the outer surface of the conductive pad 40 is flush with the outer surface of the corrugated aluminum sheath 11 to form a smooth outer surface. The conductive pad 40 is made of a conductive material, such as copper tape that may be plated, and the plating material may be silver, tin, zinc, nickel, or the like.

In one example, the helical groove 13 of corrugated aluminum jacket 11 of cable 10 has a pitch of 20mm, a depth of 4mm, and a generally triangular cross-section. Fig. 5 shows a cross-sectional view of a corresponding conductive pad 40. As shown in fig. 5, the conductive pad 40 has a generally triangular cross-section with the corners of the triangle rounded to avoid sharp corners of the conductive pad 40. When the conductive gasket 40 is wrapped in the groove 13 of the corrugated aluminum sheath 11, the outer surface 41 of the conductive gasket 40 is substantially flush with the outer surface of the corrugated aluminum sheath 11, thereby integrally forming a smooth outer surface, facilitating the fixation of the conductive braided wire 30 to the corrugated aluminum sheath 11.

Preferably, the conductive pad 40 has a plurality of sharp portions 47 formed on the outer surface 41 thereof. When the conductive braided wire 30 is fixed to the corrugated aluminum sheath 11, the sharp portion 47 on the outer surface 41 of the conductive pad 40 can be inserted into the conductive braided wire 30, for example, into the gap between the fine copper wires of the conductive braided wire 30, so that the conductive braided wire 30 is stuck on the outer surface of the corrugated aluminum sheath 11, and at the fixing portion between the conductive braided wire 30 and the corrugated aluminum sheath 11, the electrical contact between the conductive braided wire 30 and the corrugated aluminum sheath 11 is enhanced, and the conductive braided wire 30 is prevented from falling off from the corrugated aluminum sheath 11, which is advantageous for achieving reliable electrical connection between the conductive braided wire 30 and the corrugated aluminum sheath 11, and further achieving good ground connection of the tail tube 20. It is further preferred that the side surfaces 43 and 45 of the conductive pad 40 are also formed with a plurality of sharp portions 49 in the form of barbs. When the conductive gasket 40 is wound in the groove 13 of the corrugated aluminum sheath 11, the side surfaces 43 and 45 of the conductive gasket 40 face the groove 13 and are accommodated in the groove 13. The sharp portions 49 on the side surfaces 43 and 45 of the conductive pad 40 are advantageous in increasing the engagement force between the side surfaces 43 and 45 of the conductive pad 40 and the grooves 13 of the corrugated aluminum sheath 11 to retain the conductive pad 40 in the grooves 13 of the corrugated aluminum sheath 11, providing a smooth connection surface for the connection between the conductive braided wire 30 and the corrugated aluminum sheath 11. The sharp portion 49 is able to penetrate the corrugated aluminum sheath 11 without penetrating the corrugated aluminum sheath 11 and without destroying the structure of the cable 10 within the corrugated aluminum sheath 11 and therefore without destroying the protective function provided by the corrugated aluminum sheath 11.

After the conductive gasket 40 is wound in the groove 13 of the corrugated aluminum sheath 11 to form a smooth outer surface, the end of the conductive braided wire 30 is fixed to the corrugated aluminum sheath 11 using a fastener (not visible in fig. 3) to achieve reliable electrical and mechanical connection between the tail pipe 20 and the corrugated aluminum sheath 11. The fastener is made of non-magnetic or micro-magnetic material. In one example, the fastener is a constant force spring. In other examples, the fastener may employ a clip or a tie, or the like.

As shown in fig. 3, the cable termination 2 further includes a first protective portion 51 and a second protective portion 53 to provide protection against water and corrosion. The first protector 51 is formed at a fixing portion between the end of the conductive braided wire 30 and the corrugated aluminum sheath 11, wrapping the end of the conductive braided wire 30 and the fastener to the corrugated aluminum sheath 11. The second protector 53 is formed at the mounting portion between the end of the pipe body 21 of the tail pipe 20 and the corrugated aluminum sheath 11, and wraps the end of the pipe body 21 around the corrugated aluminum sheath 11. In one example, the first guard 51 and/or the second guard 53 are formed from a winding of epoxy glass ribbon.

The structure of the cable terminal 2 according to the present invention is described above. The assembly process of the cable termination 2 will now be described with reference to fig. 6 and 7.

First, on the section of the corrugated aluminum sheath 11 to be connected to the tail pipe 20 and the conductive braided wire 30, a conductive gasket 40 is wound on the corrugated aluminum sheath 11, filling the groove 13 of the corrugated aluminum sheath 11, so as to provide a smooth connection face for the conductive braided wire 30 and the corrugated aluminum sheath 11. As described above, the conductive pad 40 may be wound only at the position of the corrugated aluminum sheath 11 to be fixed with the end of the conductive braided wire 30, without being wound from that position all the way to the position of the pipe body portion 21 of the corrugated aluminum sheath 11 to which the tail pipe 20 is to be mounted.

Then, the body portion 21 of the tail pipe 20 is attached to one end of the cable 10 such that the plurality of conductive braided wires 30 having one end fixed to the inner wall of the body portion 21 of the tail pipe 20 extend from the body portion 21 and are distributed on the outer periphery of the corrugated aluminum sheath 11 of the cable 10, as shown in fig. 6. The length of the conductive braided wire 30 extending from the body portion 21 of the tail pipe 20 may be set according to the needs of the installation site.

Although in the above description, the pipe body portion 21 of the tail pipe 20 is attached to the cable 10 after the conductive gasket 40 is wound on the corrugated aluminum sheath 11. However, the present invention is not limited thereto. For example, when the conductive gasket 40 only needs to be wound at a position of the corrugated aluminum sheath 11 to be fixed to the end of the conductive braided wire 30, the conductive gasket 40 may be wound on the corrugated aluminum sheath 11 after the body portion 21 of the tail pipe 20 is attached to the cable 10.

After the body portion 21 of the tail pipe 20 is mounted to the end of the cable 10 and the conductive gasket 40 is wound on the corrugated aluminum sheath 11 to form a smooth outer surface, the end of the conductive braided wire 30 is fixed on the corrugated aluminum sheath 11 using a fastener, as shown in fig. 7. In the example shown in the figures, the fastener is a constant force spring 60.

Then, an epoxy glass ribbon is wound at a fixing portion between the end portion of the conductive braided wire 30 and the corrugated aluminum sheath 11, and the end portion of the conductive braided wire 30 and the constant force spring 60 are wrapped to the corrugated aluminum sheath 11 to form a first protective portion 51 providing waterproof and corrosion-proof functions. Further, an epoxy glass ribbon is wound around the end of the pipe body 21 of the tail pipe 20 at the attachment portion between the corrugated aluminum sheath 11, and the end of the pipe body 21 is wrapped around the corrugated aluminum sheath 11 to form a second protective portion 53. Thereby, the assembly of the cable termination 2 shown in fig. 3 is completed. Then, the conductive braided wire 30 is pressed toward the outer peripheral surface of the corrugated aluminum sheath 11, and the sharp portion 47 on the outer surface 41 of the conductive pad 40 is inserted into the conductive braided wire 30, so that the conductive braided wire 30 is attached to the corrugated aluminum sheath 11 for subsequent field installation treatment, such as providing a heat-shrinkable layer on the corrugated aluminum sheath 11 and the conductive braided wire 30.

The cable termination according to the utility model is described above. According to the utility model discloses a cable terminal uses electrically conductive gasket to convolute in order to fill out the recess on the surface of wrinkle aluminium sheath on the wrinkle aluminium sheath, provide level and smooth connection face, and use the fastener to fix electrically conductive braided wire to wrinkle aluminium sheath, realize the electricity between tail pipe and the wrinkle aluminium sheath through electrically conductive braided wire and be connected, and preferably, set up sharp portion on the surface at electrically conductive gasket, be favorable to electrically conductive braided wire and wrinkle aluminium sheath between reliable being connected, thereby can form reliable electricity and mechanical connection between the wrinkle aluminium sheath of tail pipe and cable, need not to carry out complicated welding process, and consequently can avoid because the damage scheduling problem that the welding caused.

In the example shown above, the conductive pad 40 extends from the fixing portion between the end of the conductive braided wire 30 and the corrugated aluminum sheath 11 to the mounting portion between the tail pipe 20 and the corrugated aluminum sheath 11. However, the present invention is not limited thereto. In other examples according to the present invention, the conductive gasket 40 may be provided only at the fixing portion between the end of the conductive braided wire 30 and the corrugated aluminum sheath 11, or may be provided only at the above-mentioned fixing portion and the above-mentioned mounting portion, respectively, without providing the conductive gasket 40 therebetween.

In the example shown above, the grooves 13 on the outer surface of the corrugated aluminum sheath 11 are in a spiral shape and the conductive pads 40 are in a corresponding spiral shape. However, the present invention is not limited thereto, and according to the present invention, the groove of the outer surface of the corrugated aluminum sheath of the cable terminal can also be annular, and accordingly, the conductive gasket having the corresponding contour is filled in this groove of the corrugated aluminum sheath, and the above-described similar advantageous effects can be also achieved.

In the example shown above, the corrugated metal sheath of the cable termination 2 is a corrugated aluminum sheath. However, the present invention is not limited thereto. In other examples according to the invention, other corrugated metal sheaths, such as corrugated steel sheaths, may also be used for the cable termination.

Here, an exemplary embodiment of a cable termination according to the present invention has been described in detail, but it should be understood that the present invention is not limited to the specific embodiments described and illustrated in detail above. Numerous modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the invention. All such variations and modifications are intended to fall within the scope of the present invention. Moreover, all the components described herein may be replaced by other technically equivalent components.

Claims (10)

1. A cable termination comprising:

the cable comprises a cable, wherein a corrugated metal sheath is arranged outside a conductor core of the cable, and a groove is formed in the outer surface of the corrugated metal sheath; and

a tail pipe having an end mounted to the corrugated metal sheath and electrically connected with the corrugated metal sheath via a plurality of conductive braided wires, wherein one ends of the plurality of conductive braided wires are fixed to the tail pipe and the other ends of the plurality of conductive braided wires are fixed to the corrugated metal sheath via a fastener,

characterized in that said cable termination further comprises a conductive gasket disposed between said other ends of said plurality of conductive braided wires and said corrugated metal sheath, said conductive gasket being wound in a groove of said corrugated metal sheath, and an outer surface of said conductive gasket being flush with an outer surface of said corrugated metal sheath.

2. The cable termination of claim 1, further comprising:

a first protector formed at a fixing portion between the other ends of the plurality of conductive braided wires and the corrugated metal sheath to wrap the other ends of the plurality of conductive braided wires and the fastener to the corrugated metal sheath; and

a second protection part formed at an installation part between the end of the tail pipe and the corrugated metal sheath to wrap the end of the tail pipe to the corrugated metal sheath.

3. The cable termination of claim 2 wherein said conductive gasket is further disposed between said end of said tail tube and said corrugated metal jacket, wrapped in said groove of said corrugated metal jacket.

4. The cable termination of claim 2, wherein the groove extends helically in an axial direction of the corrugated metal jacket.

5. The cable termination of claim 4, wherein the conductive gasket extends from the fixing portion along the groove to the mounting portion between the end of the tail tube and the corrugated metal jacket.

6. The cable termination of claim 2, wherein the first and/or second shield portions are formed from a winding of epoxy glass ribbon.

7. The cable termination according to any one of claims 1 to 6, wherein the outer surface of the conductive gasket is formed with a plurality of sharp portions adapted to be inserted into the plurality of conductive braided wires.

8. Cable termination according to claim 7, wherein the cross-sectional profile of the conductive gasket matches the cross-sectional profile of the groove and/or

The side surface of the conductive gasket is formed with a plurality of sharp portions, and the side surface of the conductive gasket is accommodated in the groove.

9. The cable termination according to any one of claims 1 to 6, wherein the fastener is made of a non-magnetic or micro-magnetic material and is selected from any one of the following: constant force spring, clamp, ribbon.

10. The cable termination according to any one of claims 1 to 6, wherein the corrugated metal sheath is a corrugated aluminum sheath.

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