KR870000834B1

KR870000834B1 - Contraction tube for cable insulation joint

Info

Publication number: KR870000834B1
Application number: KR1019800003142A
Authority: KR
Inventors: 코오지로오 이시세; 케이이찌 고지마
Original assignee: 스미도모덴기 고오교오 가부시기 가이샤; 다부찌 노보루
Priority date: 1980-08-08
Filing date: 1980-08-08
Publication date: 1987-04-23
Also published as: KR830003824A

Abstract

6), whose radius is smaller than that of the contraction tube but larger than that of a reinforced insulation layer, then contracted by heating to make a non-conductive portion(1). This heating process starts from the other side of a bended portion(4). The bended portion is made by bending one edge of the contraction tube before the contraction ending. Another contraction tube surrounds the aluminium pipe and forms a nonconductive portion by heating contraction. These non-conductive portions are overlapped at an insulator and molded to one body.

Description

Shrink tubing for cable insulation

제1도는 본 발명의 케이블절연접속용 수축튜우브의 대칭 상반부를 도시한 종단면도.1 is a longitudinal sectional view showing the symmetrical upper half of the shrink tubing for cable insulation connection of the present invention.

제2도는 본 발명의 수축튜우브를 적용해서 형성된 케이블절연 접속부의 대칭 상반부를 도시한 종단면도.2 is a longitudinal sectional view showing the symmetrical upper half of the cable insulation connecting portion formed by applying the shrink tubing of the present invention.

본 발명은 고압케이블의 절연접속용으로 적합한 수축튜우브에 관한 것이다.The present invention relates to a shrink tube suitable for the insulated connection of a high voltage cable.

절연층에 가교폴리에틸렌을 사용한 전선, 케이블은 근래에 점차적으로 고전압 케이블로서 적용되는 경향이 있다. 이에 따라 이들 전선, 케이블의 접속부에 있어서도 신뢰성이 요구되고, 도체접속부상에 고무프라스틱 보강 절연층을 입혀, 가열가압하여 케이블절연층과 일체화하는 모올드타이프의 접속부가 널리 채용되고 있다.In recent years, electric wires and cables using crosslinked polyethylene in the insulating layer tend to be gradually applied as high voltage cables. As a result, reliability is also required in the connection portions of the electric wires and cables, and a connection portion of a mould-type which is coated with a rubber plastic reinforcement insulating layer on the conductor connection portion and is heated and pressurized to be integrated with the cable insulation layer is widely adopted.

한편 이와같은 케이블의 실선로에의 적용은 장거리화하는 경향이 있고, 차폐용 외부반도전층에 절연층의 이른바 연절부를 설치하는 것이 필요해 졌다.On the other hand, the application of such a cable to a solid line tends to be long, and it is necessary to provide a so-called connecting portion of the insulating layer in the shielding external semiconducting layer.

종래, 상기 케이블접속부(절연접속부라고 한다)의 형성에는 보강 절연층상의 끝에서 중앙부에 걸쳐서 반도전성재료를 테이프형상으로 감고, 그 감은 끝에 절연성 테이프를 감아서 연절부를 설치하고, 또 다른 쪽에도 반도전성재료의 테이프를 감는 방법이 채용되고 있기 때문에 그 형성작업은 번잡하고 장시간을 필요로 했었다.Conventionally, in the formation of the cable connecting portion (called an insulated connecting portion), a semiconductive material is wound in the shape of a tape from the end of the reinforcement insulating layer to the center portion, and an insulating tape is wound around the end of the winding to install a connecting portion, and the other side is also semiconductive Since the method of winding the tape of the material is adopted, the forming work was complicated and required a long time.

본 발명은 종래의 케이블절연접속부의 상기 결점을 제거하는 것으로서 2개의 반도전성수축 튜우브의 일단이 서로 절연부분을 사이에 두고 오우버탭되어서 연절부를 구성하고, 일체화 되어서 구성되는 수축튜우브로서, 그 내경이 케이블접속부의 보강절연층의 외경보다 큰 것을 특징으로 한다.The present invention eliminates the above drawbacks of a conventional cable insulated connection, wherein one end of two semiconductive shrink tubings is overtap with an insulated portion interposed therebetween to form a connecting portion, and is integrally formed as a shrinkage tube. The inner diameter is larger than the outer diameter of the reinforcing insulation layer of the cable connecting portion.

본 발명의 상기 수축튜우브는 미리 연절부를 설치한 것이기 때문에, 이것을 보강절연층에 씌워서 가열 수축하는 것만으로 연절부가 달린 접속부를 이루고, 조인트공방이 대폭적으로 합리화된다.Since the shrink tubing of the present invention is provided with a connecting portion in advance, the joint tube is greatly rationalized by forming the connecting portion with the connecting portion simply by covering the reinforcing insulating layer and heating and shrinking it.

또 연절부를 포함하는 부분에만 전자선을 조사하여 이 부분을 양단보다 수축이 잘 안되도록하면, 이부분의 수축력이 작어져서 보강절연층에 이 수축튜우브가 파고드는 일이 없어져서, 케이블절연접속용의 수축튜우브로서도 더욱 적합하다는 것도 알게 되었다.In addition, if the electron beam is irradiated only to the part including the connecting part so that the part is not shrunk better than both ends, the shrinkage force of this part becomes small, and this shrinkage tube does not penetrate into the reinforcing insulating layer, thereby preventing the cable insulation connection. It has also been found to be more suitable as a shrink tube.

본 발명을 도면에 따라 설명한다. 제1도는 본 발명의 수축튜우브의 대칭상반부를 도시한 종단면도이다. 부호(1), (2)는 수축튜우브의 반도전성부분, 부호(3)는 연결부, 부호(4), (5)는 반도전성부분의 연절부측단부이다.The present invention will be described with reference to the drawings. 1 is a longitudinal sectional view showing the symmetrical upper half of the contraction tube of the present invention. Reference numerals 1 and 2 denote semiconducting portions of the contraction tube, reference numerals 3 denote connecting portions, and reference numerals 4 and 5 denote edge portions of the semiconductive portions.

본 발명은 상기와 같은 구조를 가지는 수축튜우브이기 때문에 이하와같이 제조된다.The present invention is manufactured as follows because it is a shrinking tube having the above structure.

반도전성수축튜우브를 이튜우브의 내경보다 작고 보강절연층의 외경보다 큰 알루미늄파이프(6)의 위에 씌워서 버어너, 토오치램프등으로 가열수축해서 반도전성부분 (1)을 형성한다. 이때 가열수축은 열전부측단부(4)의 반대측으로부터 실시하고, 완전히 수축하기전에 반도전성수축튜우브의 연절부측단부(4)는 절곡하고, 그후 완전히 수축시켜서 연절부측단부(4)에 느슨한 모를낸다. 다음에 연신(延伸)된 폴리에틸렌테이프를 감아서 연절부(3)을 만들고, 그 일부와 알루미늄파이프(6)의 위에 다른 반도전성 수축튜우브를 씌워서 가열수축시켜서 반도전성부분(2)을 형성한다. 이때도 역시 반도전성부분(2)의 연절부측단부(5)는 튜우브선단을 절곡하여 느슨한모를 이루게한다. 그후 알루미늄파이프(6)을 발취하여 본 발명의 케이블절연접속용수측 튜우브의 제조가 완료한다.The semiconductive shrink tubing is covered over the aluminum pipe 6 which is smaller than the inner diameter of the it tube and larger than the outer diameter of the reinforcing insulating layer, and heat shrinked with a burner, a torch lamp, or the like to form the semiconductive portion 1. At this time, the heat shrinkage is performed from the opposite side of the thermoelectric side end portion 4, and the edge portion side end portion 4 of the semiconductive shrinkage tubing is bent before completely contracting, and then completely contracted to the edge portion side edge portion 4. Loose loose. Next, the stretched polyethylene tape is wound to form a stretched portion 3, and a semiconductive portion 2 is formed by covering a portion thereof and another semiconductive shrink tube over the aluminum pipe 6 to heat and shrink. . In this case, too, the edge portion 5 of the semiconducting portion 2 is bent the tube end to form a loose hair. Thereafter, the aluminum pipe 6 is extracted to complete the manufacture of the water insulated tubing for cable insulation of the present invention.

제2도는 본 발명의 수축튜우브를 적용하여 형성된 케이블절연접속부의 대칭상 반분을 나타내는 종단면도이다. 제2도에 있어서 부호(7)는 도체, 부호(8)는 도체접속부, 부호(9)는 케이블 절연부분이다. 부호(10)는 보강절연층이고 부호(11)는 본 발명의 수축튜우브이다.2 is a longitudinal sectional view showing a symmetrical half of a cable insulation connecting portion formed by applying the shrink tube of the present invention. In Fig. 2, reference numeral 7 denotes a conductor, reference numeral 8 denotes a conductor connecting portion, and reference numeral 9 denotes a cable insulation portion. Reference numeral 10 is a reinforcement insulating layer and reference numeral 11 is a contraction tube of the present invention.

다음에 본 발명의 수축튜우브의 제조방법을 구체적으로 설명한다.Next, the manufacturing method of the shrink tubing of this invention is demonstrated concretely.

카아본블랙이 들어있는 반도전성폴리에틸렌을 사용해서 내경 25mm

, 두께 2 mm의 튜우브를 만들어 15Mrad전자선을 조사(照射)한후, 내경 70mm

까지 팽창시켰다. 이 튜우브를 길이 30cm로 절단하여 편단(片端)을 5cm절곡하여 외경 60mm

의 긴쪽방향으로 반으로 쪼갠 알루미늄파이프위에 씌우고 토오치램프로 가열수축시켰다.Internal diameter 25mm using semiconductive polyethylene containing carbon black

A tube with a thickness of 2 mm and irradiated with 15Mrad electron beam

Inflated to The tub is cut to 30 cm in length, one end bent 5 cm to an outer diameter of 60 mm.

The aluminum pipe was split in half in the longitudinal direction of and was heated and shrunk with a torch lamp.

다음에, 길이방향으로 연신된 가교폴리에틸렌테이프를 상기 튜우브의 절곡한 편단상 및 알루미늄파이프상에 약 3mm의 두께로 감았다.Next, the crosslinked polyethylene tape stretched in the longitudinal direction was wound to a thickness of about 3 mm on the bent one-phase and aluminum pipe of the tub.

다시 편단을 동일하게 절곡한 또 하나의 반도전성 수축튜우브를 상기 가교폴리에틸렌테이프를 감은 부분의 일부와 알루미늄파이프위에 씌워서 가열수축 시켰다.Again, another semiconductive shrink tubing with the same ends bent was heated and shrunk by covering the portion of the cross-linked polyethylene tape and the aluminum pipe.

다음에 전체를 150℃로 30분간 가열해서 일체화한후 알루미늄파이프를 뽑아내서 본 발명의 수축튜우브를 완성시켰다.Next, the whole was heated at 150 ° C. for 30 minutes to integrate, and the aluminum pipe was taken out to complete the shrinkage tube of the present invention.

또 상기 수축튜우브가 연절부를 포함하는 부분에만 전자선을 20Mrad 조사하는 것이 바람직하다. 그 이유는 수축튜우브의 상기부분에 전자선을 조사하지 아니하면 케이블접속부전체를 가열가압하면 연절부의 수축력이 다른 부분보다 크기 때문에 이 연절부가 보강절연층에 밀려들어가는 현상이 나타나지만 전자선을 조사하면 그 부분의 수축률이 적어져서 접속부전체를 가열가압해도 상기와같은 현상이 없어지기 때문이다In addition, it is preferable to irradiate the electron beam with 20 Mrad only in the portion in which the contraction tube includes the connecting portion. The reason for this is that if the entire area of the cable connection is heated and pressurized unless the above-mentioned portion of the shrinking tube is irradiated, the shrinkage force of the connecting portion is greater than that of the other portion. This is because the shrinkage of the part decreases and the above phenomenon disappears even when the entire connecting portion is heated and pressed.

상기 수축튜우브를 케이블 절연접속에 적용할때에는 하기와 같이 실시된다.When the shrink tube is applied to the cable insulated connection is carried out as follows.

도체단면적 150㎟의 가교 폴리에틸렌케이블을 사용하여, 도체접속을 실시해서 그 위에 두께 10mm의 보강절연통을 형성하고, 다음 그 위에 상술한 연절부가 달린 수축튜우브를 씌워서 가열수축시켜 케이블의 절연접속을 완성시켰다.Using a cross-linked polyethylene cable with a conductor cross-sectional area of 150 mm2, conduct a conductor connection to form a 10 mm thick reinforcement insulated tube, and then cover the shrink tubing with the above-mentioned connection part and heat-shrink it to make insulation of the cable. It was completed.

종래테이프를 감아 연절부를 만들고 있던 조인트공법에 비해서 접속에 요하는 시간은 대폭으로 단축되었다. 또 완성된 케이블접속부는 전기성능도 좋고 고압케이블의 절연접속으로서의 신뢰성도 충분하다.Compared with the joint method of winding tapes, the time required for connection is significantly shortened. Moreover, the completed cable connection part has good electrical performance and sufficient reliability as an insulated connection of a high voltage cable.

Claims

One end of the two semiconducting shrink tubings is overlapped with each other with an insulating part interposed therebetween to form a connecting portion 3 and is integrally formed as a shrinking tubing 11, the inner diameter of which is a reinforced insulating layer 10 of the cable connection part. Shrink tubing for cable insulation, characterized in that larger than the outer diameter of).