CN210430894U - Cable joint oversheath watertight fittings - Google Patents

Abstract

The utility model provides a cable joint oversheath watertight fittings, including two cable cores and a connecting pipe, two cable cores are connected through the connecting pipe, the position that the both ends of connecting pipe and cable core contact has also been filled with waterproof glue, the middle of connecting pipe has also been cup jointed cold shrink pipe, the both ends of cold shrink pipe have also been filled with waterproof glue, and the outside of cold shrink pipe has still twined the semiconductor tape, the outside of semiconductor tape has still brushed waterproof coating, specifically 525BG waterproof anticorrosive coating, the outside of cable core has still wrapped up the oversheath layer from outside to inside, the steel armor in the sheath layer, the metallic shield layer, semiconductor layer and main insulation layer, solve some irregularities of existing cable joint and can't avoid appearing some folds when twining the waterproof tape, make the wrapping effect not good, meanwhile for some prefabricated shaped accessories, can be because shrink untight and can't guarantee certain external pressure, thereby causing a problem of intrusion of substances such as gas, moisture, impurities, and the like.

Description

Cable joint oversheath watertight fittings

Technical Field

The utility model belongs to the technical field of the cable connection, concretely relates to cable joint oversheath watertight fittings.

Background

With the rapid development of urban power distribution networks, the application of 10kV medium-voltage XLPE cables is more and more extensive. However, the cable is damaged due to external damage, poor installation, insulation aging and other factors in the actual operating environment. Due to the special high-temperature, high-humidity and high-corrosion weather conditions in coastal areas and the uneven cable construction technical level, water branches are more easily formed, cable joint faults occur sometimes, and the power supply reliability of a power distribution network is seriously influenced.

The cable joint is the weakest link of cable line insulation, and the defect appears easily and leads to the operation trouble, and the leading reason is that cable joint department power plant is a distortion electric field. The causes of electric field distortion are roughly as follows: in the process of manufacturing the cable joint, the metal shielding layer, the semiconductor layer, the insulating layer and the wire core need to be cut and stripped, the field intensity at the cut-off part of the shielding layer and the wire core of the cable is the maximum, and the phenomenon of strong electric stress concentration exists, and the point is the weak link of the whole cable joint insulation. Meanwhile, in some places with severe construction conditions or operation conditions, it is difficult to avoid water or other impurities from invading the cable joint, thereby affecting the insulation performance and even causing insulation breakdown in severe cases. After the fault joint is dissected, the phenomenon that some power cable intermediate joints which are complete in appearance and do not have ablation signs appear obvious carbonization smoke black after the waterproof adhesive tape is stripped can be found, and after the cold-shrink sleeve is stripped, the phenomenon that an obvious carbonization channel extending from the wire core to the outside of the insulating sleeve exists can be found, so that the fault cable can be obtained, the fault cable is punctured, the insulation surface at the cable joint is subjected to discharge, and the condition that some insulation defects exist at the insulation joint of the cold-shrink silicon rubber insulating sleeve and the cable is easy to cause moisture and impurity intrusion to form insulation faults can be also shown.

When two cables are connected, the cable cores need to be crimped by connecting pipes. The current is transmitted through the cable at one end and then through the connecting tube to the other end, and the connecting portion of the two is one of the weak points of the cable joint. The cable running in a humid environment may have the condition that the wire core is affected by water due to the influence of water branches, and water in the wire core may flow into the middle joint of the recovered power cable, so that the insulation of a weak point is damaged more seriously. The cable intermediate head that wets seriously can produce adverse effect to power supply reliability, not only can increase maintenance personnel's work load, still can cause huge economic loss, and the main reason that solid insulation medium takes place face discharge is exactly the influence of factors such as air gap, moisture, impurity. It is not only relevant to the external laying environment, but also relevant to the manufacturing process of manufacturing the joint, and even relevant to the damage of external force factors.

The existing cable joint has the following defects in the waterproof connection process:

the condition that the cutter mark is too deep appears when the semiconductor layer is cut and stripped, so that the main insulating surface is scratched, an air gap is generated, meanwhile, after the semiconductor layer of the power cable is stripped, the semiconductor layer is not cleaned completely and still remains or is cleaned repeatedly to cause defects, so that creeping on the surface is caused, tip edges and corners can appear when a connecting pipe is in compression joint with a cable core, so that local field intensity concentration occurs, serious electric field distortion exists, so that tip discharge is caused, when cold-shrink joints are manufactured, certain wrinkles can inevitably appear when waterproof belts are wound at irregular positions, so that the wrapping effect is poor and not very tight, meanwhile, for some prefabricated forming accessories, certain external pressure intensity can not be ensured due to untight shrinkage, so that substances such as gas, moisture, impurities and the like are invaded, when the cold-shrink joints are manufactured, after the silicon rubber insulating sleeve is shrunk, other sealing treatment is not carried out, so that moisture is invaded into a power cable joint, and the potential discharge hazard is caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that lie in to above-mentioned prior art not enough, provide a cable joint oversheath watertight fittings, with solve some folds that can be difficult for appearing when some unevenness department winding waterproof tape of cable joint that provide among the above-mentioned background art, thereby make the package wrap the effect not good, not very inseparable, meanwhile to some prefabricated shaping annex, can be because the shrink is inseparable and can't guarantee certain external pressure, thereby lead to the problem of the invasion of materials such as gas, moisture, impurity.

In order to solve the technical problem, the utility model discloses a technical scheme is: the utility model provides a cable joint oversheath watertight fittings, includes two cable core and a connecting pipe, two the cable core passes through the connecting pipe and connects, the both ends of connecting pipe and the position of cable core contact have still been annotated waterproof glue, the cold draw pipe has still been cup jointed in the centre of connecting pipe, the both ends of cold draw pipe have also been annotated waterproof glue, just the outside of cold draw pipe still twines the semiconductor zone, the outside of semiconductor zone has still been brushed waterproof paint.

Preferably, the semiconductor tape is wound with two layers, and wherein the winding is accomplished by a 50% lap joint method.

Preferably, the waterproof coating is 525BG waterproof anticorrosion coating.

Preferably, the outer side of the cable core is wrapped with an outer sheath layer, an inner sheath layer of the steel armor layer, a metal shielding layer, a semiconductor layer and a main insulating layer from outside to inside.

Compared with the prior art, the utility model has the following advantage:

the utility model discloses a this both ends at the cable joint connecting pipe are annotated and are had the waterproof glue, cup joint cold draw pipe in the outside of connecting pipe simultaneously, after the shrinkage of cold shrink pipe, waterproof glue is annotated at two ports and is done sealed the processing, make the inside waterproof performance of power cable intermediate head department sinle silk and the outside waterproof performance of cold draw pipe all obtain promoting greatly, and tightly twine the semiconductor strip in the outside shrinkage pipe of connecting pipe, this waterproof construction who makes between power cable intermediate head and cold shrink pipe and the cable core obtains optimizing, carry out water proof coating again and brush the processing, this makes the outside waterproof performance of cold draw pipe strengthen, make the cold shrink pipe be difficult for suffering moisture, the air, the invasion of impurity, the protective properties of power cable joint department has been strengthened.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a schematic view of the connection structure of the cold shrink tube of the present invention.

Description of reference numerals:

1-a cable core; 2-connecting pipe; 3-waterproof glue; 4-cold-shrink tube; a 5-semiconductor band; 6-waterproof coating; 7-an outer jacket layer; 8-steel armor; 9-inner jacket layer; 10-a metal shielding layer; 11-a semiconductor layer; 12-main insulating layer.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1-2, the utility model provides a technical solution: the utility model provides a cable joint oversheath watertight fittings, includes two cable core 1 and a connecting pipe 2, two cable core 1 connects through connecting pipe 2, and wherein two cable core 1 specifically carry out the crimping through connecting pipe 2 and connect, then the electric current is held the transmission through a cable conductor and is come, and the connecting pipe 2 transmission to another cable core of flowing through.

The both ends of connecting pipe 2 and the position of 1 contact of cable core have still filled waterproof glue 3, and waterproof glue 3 can avoid 1 junction of cable core to receive the invasion of moisture, air, impurity, cold draw 4 has still been cup jointed in the centre of connecting pipe 2, the both ends of cold draw 4 have also filled waterproof glue 3, just the outside of cold draw 4 still twines semiconductor zone 5, and the winding of semiconductor zone 5 has two-layerly, and wherein accomplishes the winding through 50% overlap joint method, and semiconductor zone 5 is in order to increase waterproof glue 3 and cold draw 4 and connecting pipe 2 and 1 looks compactness of cable core.

The waterproof coating 6 is coated on the outer side of the semiconductor strip 5, the waterproof coating 6 is 525BG waterproof anticorrosive coating, and accordingly the waterproof performance of the outer portion of the cold-shrinkable tube 4 is enhanced, the cold-shrinkable tube 4 is not prone to invasion of moisture, air and impurities, and the protection performance of a power cable joint is enhanced.

In order to facilitate normal use of the cable, the outer side of the cable core 1 is further wrapped with an outer sheath layer 7, a steel armor layer 8, an inner sheath layer 9, a metal shielding layer 10, a semiconductor layer 11 and a main insulating layer 12 from outside to inside.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (4)

1. The utility model provides a cable joint oversheath watertight fittings, includes two cable core (1) and a connecting pipe (2), two cable core (1) is connected its characterized in that through connecting pipe (2): waterproof glue (3) is also filled at the positions of the two ends of the connecting pipe (2) and the cable core (1), a cold shrinkage pipe (4) is further sleeved in the middle of the connecting pipe (2), waterproof glue (3) is also filled at the two ends of the cold shrinkage pipe (4), a semiconductor strip (5) is further wound outside the cold shrinkage pipe (4), and waterproof paint (6) is further coated on the outer side of the semiconductor strip (5).

2. The device according to claim 1, characterized in that said semi-conductive tape (5) is wound in two layers and wherein the winding is done by a 50% lap joint method.

3. Device according to claim 1, characterized in that said waterproofing coating (6) is in particular a 525BG waterproofing and anti-corrosion coating.

4. The cable joint outer sheath waterproof device according to claim 1, wherein the outer side of the cable core (1) is wrapped with an outer sheath layer (7), a steel armor layer (8), an inner sheath layer (9), a metal shielding layer (10), a semiconductor layer (11) and a main insulating layer (12) from outside to inside.

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