JPH0211987B2 - - Google Patents
Info
- Publication number
- JPH0211987B2 JPH0211987B2 JP60084718A JP8471885A JPH0211987B2 JP H0211987 B2 JPH0211987 B2 JP H0211987B2 JP 60084718 A JP60084718 A JP 60084718A JP 8471885 A JP8471885 A JP 8471885A JP H0211987 B2 JPH0211987 B2 JP H0211987B2
- Authority
- JP
- Japan
- Prior art keywords
- cable
- induction heating
- mold
- coil
- heating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000010438 heat treatment Methods 0.000 claims description 31
- 230000006698 induction Effects 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 13
- 239000004020 conductor Substances 0.000 claims description 12
- 239000011248 coating agent Substances 0.000 claims description 9
- 238000000576 coating method Methods 0.000 claims description 9
- 238000001125 extrusion Methods 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 229920003020 cross-linked polyethylene Polymers 0.000 claims description 4
- 239000004703 cross-linked polyethylene Substances 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 239000012212 insulator Substances 0.000 description 6
- 238000007796 conventional method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- 238000004804 winding Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- -1 for example Inorganic materials 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
Description
【発明の詳細な説明】
［発明の背景と目的］
本発明は、架橋ポリエチレン絶縁金属被覆ケー
ブル、例えば架橋ポリエチレン絶縁アルミ被ビニ
ル防食ケーブル（以下CAZVケーブルと呼ぶ）を
押出しモールドにより接続するに際してのケーブ
ル導体誘導加熱方法に関するものである。Detailed Description of the Invention [Background and Objectives of the Invention] The present invention provides a cable for connecting cross-linked polyethylene insulated metal-coated cables, such as cross-linked polyethylene insulated aluminum-covered anti-corrosion cables (hereinafter referred to as CAZV cables) by extrusion molding. The present invention relates to a conductor induction heating method.
この種ケーブルを押出しモールドにより接続す
るに際して、接続部の絶縁体の架橋もしくは押出
し成型を短時間で完全なものとするため、モール
ド用金型の加熱と共にケーブル導体を誘導加熱に
より加熱し、絶縁体温度を充分なものとすること
は通常行われており、第１図はその概念を示す図
である。 When connecting this type of cable by extrusion molding, in order to complete the cross-linking or extrusion molding of the insulator at the connection part in a short time, the cable conductor is heated by induction heating at the same time as the molding die is heated. It is common practice to maintain a sufficient temperature, and FIG. 1 is a diagram illustrating the concept.
第１図において、金型４内に配置されたモール
ド接続部６に対しては、図示しない加熱装置によ
り外側からの加熱が行われる。そして、この時の
加熱の効果を補うために、更に金型４の両側のケ
ーブル部分に対して誘導加熱コイル５を配置し、
ケーブルの導体１を加熱して接続部を内側からも
加熱する。ところが、従来のこの種誘導加熱で
は、図示のように導体１に沿つて磁界を形成して
行われるから、ケーブルが前述のように絶縁体２
の外側に金属、例えばアルミニウムの被覆３を有
するCAZVケーブルである場合には、コイル５の
近辺の金型部分４′及びアルミ被覆３′の不必要な
１熱を防ぐためにコイル５とそれらとの間の距離
を充分大きくとる必要があり、その結果、出来る
だけ短いことが望ましい接続部を不必要に長くと
らねばならなくなる（アルミ被覆を剥いだ部分ま
でが接続部全体の長さとなる。）と言う問題があ
る。 In FIG. 1, a mold connection portion 6 placed in a mold 4 is heated from the outside by a heating device (not shown). In order to compensate for the heating effect at this time, induction heating coils 5 are further placed on the cable portions on both sides of the mold 4.
The conductor 1 of the cable is heated to heat the connection part from the inside as well. However, in conventional induction heating of this type, a magnetic field is formed along the conductor 1 as shown in the figure, so the cable is connected to the insulator 2 as described above.
In the case of a CAZV cable having a metal, for example, aluminum sheath 3 on the outside, the coil 5 and the aluminum sheath 3' should be connected to each other in order to prevent unnecessary heating of the mold part 4' and the aluminum sheath 3' near the coil 5. It is necessary to provide a sufficiently large distance between the parts, and as a result, the connection part, which is desirable to be as short as possible, has to be made unnecessarily long (the length of the entire connection part is the part where the aluminum coating is removed). I have a problem to say.
本発明の目的は、誘導加熱に伴う接続部の長大
化を不必要とするこの種誘導加熱方法を提供する
ことである。 An object of the present invention is to provide an induction heating method of this type that eliminates the need to increase the length of the connecting portion due to induction heating.
［発明の概要］
本発明によれば、従来のケーブルの長さ方向に
沿つた磁界の代りにケーブル導体に直交する磁界
を用いることにより上記目的を達成する。SUMMARY OF THE INVENTION According to the present invention, the above objects are achieved by using a magnetic field perpendicular to the cable conductor instead of a conventional magnetic field along the length of the cable.
［実施例］
第２図は、本発明の方法の一実施例を説明する
概念図である。[Example] FIG. 2 is a conceptual diagram illustrating an example of the method of the present invention.
第２図においては、第１図の従来の方法とは異
り、後述する形状の鉄心７を用いてコイル５によ
る磁界がケーブルに直交するようにしている。こ
のようにすることにより磁束の通る領域を最小と
することが出来、従つて金型４の端部４′とアル
ミ被覆３の端部３′間の距離を充分小さくするこ
とが出来る。 In FIG. 2, unlike the conventional method shown in FIG. 1, an iron core 7 having a shape to be described later is used so that the magnetic field generated by the coil 5 is orthogonal to the cable. By doing so, the area through which the magnetic flux passes can be minimized, and therefore the distance between the end 4' of the mold 4 and the end 3' of the aluminum coating 3 can be made sufficiently small.
このような本発明の方法の実施例により得られ
る効果を確認するために、第１図に示す従来の方
法と本発明の方法の実施例を、それぞれ
275KV600mm2CAZVケーブルの押出しモールド接
続時に対して実施した。 In order to confirm the effects obtained by the embodiment of the method of the present invention, the conventional method and the embodiment of the method of the present invention shown in FIG.
275KV600mm 2 Conducted for extrusion mold connection of CAZV cable.
まず、従来の方法について説明すると、ケーブ
ル絶縁体２の回りに被せられた内径100mm、外径
104mmの二つ割セラミツクパイプ（図示しない。）
の周上に、内径６mm、外径８mmの銅パイプを30回
巻き付けて水冷式加熱コイル５を設置する。この
時の加熱コイル５の巻き始め端から巻き終り端ま
での長さＬを400mm、加熱コイル５の一端５′から
金型４の端部４′までの距離を100mm、加熱コイル
５の他端５″からアルミ被覆３の端部３′までの距
離を100mmとし、このコイル５に3KHz、500Wの
高周波入力を30分間加えたところ、ケーブル導体
１は加熱コイル５の中央部で79℃、コイル５の中
央部から300mm離れた位置で71℃、それぞれ上昇
した。また、この時、金型４の端部４′は10℃、
アルミ被覆３の端部３′は25℃、それぞれ上昇し
た。 First, to explain the conventional method, a cable with an inner diameter of 100 mm and an outer diameter of
104mm split ceramic pipe (not shown)
A water-cooled heating coil 5 is installed around the circumference of the coil by wrapping a copper pipe having an inner diameter of 6 mm and an outer diameter of 8 mm 30 times. At this time, the length L from the winding start end to the winding end of the heating coil 5 is 400 mm, the distance from one end 5' of the heating coil 5 to the end 4' of the mold 4 is 100 mm, and the other end of the heating coil 5 is 400 mm. 5'' to the end 3' of the aluminum sheathing 3 was set to 100 mm, and a high frequency input of 3 KHz and 500 W was applied to this coil 5 for 30 minutes. At a position 300 mm away from the center of mold 5, the temperature rose by 71°C.At this time, the temperature at the end 4' of mold 4 increased by 10°C,
The ends 3' of the aluminum coating 3 were each heated by 25°C.
次に、本発明の方法の実施例について説明する
と、第３図に示すような高周波用フエライト鉄心
７（但し、L1＝200mm、L2＝140mm、L3＝120mm、
L4＝60mm、L5＝50mm、L6＝20mm、t1＝30mm、t2＝
70mm）のイの部分に厚さ２mmの二つ割セラミツク
パイプ（図示しない。）を介して、内径４mm、外
径６mmの銅パイプを20回巻き付けて水冷式加熱コ
イル５を設けてなるものを、第２図に示すように
ケーブル絶縁体２の周辺に設置する。この時、ケ
ーブル絶縁体２と鉄心端７′との空〓は上下共に
５mmに設定し、鉄心７から金型４の端部４′及び
アルミ被覆３の端部３′までの距離を、それぞれ
50mmに設定し、加熱コイル５に3KHz、500Wの高
周波入力を30分間加えたところ、ケーブル導体は
鉄心７で挟まれた位置の中央で140℃、ここから
300mm離れた位置で96℃、それぞれ上昇した。ま
た、金型４の端部４′は４℃、アルミ被覆３の端
部３′は７℃、それぞれ上昇した。 Next, to explain an embodiment of the method of the present invention, a high frequency ferrite iron core 7 as shown in FIG.
L 4 = 60mm, L 5 = 50mm, L 6 = 20mm, t 1 = 30mm, t 2 =
A water-cooled heating coil 5 is provided by winding a copper pipe with an inner diameter of 4 mm and an outer diameter of 6 mm 20 times around the part A of a 70 mm thick ceramic pipe (not shown) with a thickness of 2 mm. , installed around the cable insulator 2 as shown in FIG. At this time, the space between the cable insulator 2 and the core end 7' is set to 5 mm both above and below, and the distances from the core 7 to the end 4' of the mold 4 and the end 3' of the aluminum sheath 3 are set respectively.
50mm, and a high frequency input of 3KHz and 500W was applied to the heating coil 5 for 30 minutes, the cable conductor was heated to 140℃ at the center of the position sandwiched between the iron cores 7 and from here.
The temperature increased by 96℃ at a distance of 300mm. Further, the temperature at the end 4' of the mold 4 increased by 4°C, and at the end 3' of the aluminum coating 3 by 7°C.
上記の結果から明らかなように、従来の方法で
は、アルミ被覆３の端部３′と金型４の端部４′の
間の誘導加熱部の長さとして600mm必要であるが、
本実施例ではそれが170mmとなり、誘導加熱部の
長さは3.5分の１で足りることになる。一方、誘
導加熱効率も本実施例においては、鉄心の使用に
より著しく向上し、誘導加熱源と金型及びアルミ
被覆間の距離が短くなるにもかかわらず金型及び
アルミ被覆に与える影響は極めて少ないことがわ
かつた。 As is clear from the above results, in the conventional method, the length of the induction heating section between the end 3' of the aluminum coating 3 and the end 4' of the mold 4 is 600 mm.
In this example, it is 170 mm, which means that the length of the induction heating section is only 1/3.5. On the other hand, in this example, the induction heating efficiency is also significantly improved due to the use of an iron core, and even though the distance between the induction heating source and the mold and aluminum coating is shortened, the effect on the mold and aluminum coating is extremely small. I found out.
尚、以上高周波用フエライト鉄心に水冷式加熱
コイルを設けたものを用いて遂行する方法につい
て説明したが、本発明の方法がこれに限定される
ものでないことは言うまでもない。例えば、必要
であれば第４図に示す如く、鉄心を用いずにケー
ブル絶縁体２に近接させて、その上下に加熱用空
心コイル５０を配置することにより直交方向磁界
の発生を行うことも可能である。 Although the method using a high-frequency ferrite core provided with a water-cooled heating coil has been described above, it goes without saying that the method of the present invention is not limited to this. For example, if necessary, as shown in FIG. 4, it is also possible to generate a magnetic field in an orthogonal direction by placing heating air-core coils 50 above and below the cable insulator 2 in close proximity to the cable insulator 2 without using an iron core. It is.
［発明の効果］
以上述べたように、本発明によれば、従来ケー
ブルに沿つて形成されていた磁界をケーブルに直
交する方向とすることにより、従来の方法に比べ
て誘導加熱部の長さを大幅に縮少すると共に、加
熱効率を大幅に向上させる。また、漏洩磁束の低
減により付近の金属に対する過熱を防止し、併わ
せて不必要な漏洩電磁波の低減により制御機器へ
の影響の低減が図れる。[Effects of the Invention] As described above, according to the present invention, the length of the induction heating section can be reduced compared to the conventional method by directing the magnetic field that was conventionally formed along the cable in a direction perpendicular to the cable. This significantly reduces heating efficiency and improves heating efficiency. Furthermore, by reducing leakage magnetic flux, overheating of nearby metals can be prevented, and at the same time, by reducing unnecessary leakage electromagnetic waves, the influence on control equipment can be reduced.
第１図は従来のケーブル導体誘導加熱方法を説
明するための概念図、第２図は本発明の方法によ
るケーブル導体誘導加熱方法の一実施例を説明す
るための概念図、第３図は上記実施例において用
いられる高周波用フエライト鉄心の詳細図、第４
図は本発明によるケーブル導体誘導加熱方法の他
の実施例を説明するための概念図である。
１：ケーブル導体、２：ケーブル絶縁層、３：
アルミ被覆：４：金型、５：誘導加熱コイル、
６：モールド接続部、７：高周波用フエライト鉄
心。５０：誘導加熱用空心コイル。
Fig. 1 is a conceptual diagram for explaining the conventional cable conductor induction heating method, Fig. 2 is a conceptual diagram for explaining an embodiment of the cable conductor induction heating method according to the method of the present invention, and Fig. 3 is the above-mentioned Detailed diagram of the high frequency ferrite iron core used in the examples, No. 4
The figure is a conceptual diagram for explaining another embodiment of the cable conductor induction heating method according to the present invention. 1: Cable conductor, 2: Cable insulation layer, 3:
Aluminum coating: 4: Mold, 5: Induction heating coil,
6: Mold connection part, 7: Ferrite core for high frequency. 50: Air-core coil for induction heating.
Claims (1)
出しモールドにより接続するに際して、モールド
用金型両端部付近のケーブル金属被覆を剥ぎ取
り、その部分に対して誘導加熱を行いケーブル導
体を加熱する方法において、ケーブル導体に対し
直交する方向に磁界を形成することを特徴とする
架橋ポリエチレン絶縁金属被覆ケーブルの押出し
モールド接続時のケーブル導体誘導加熱方法。1. When connecting a cross-linked polyethylene insulated metal-coated cable by extrusion molding, the cable conductor is heated by stripping off the cable metal coating near both ends of the molding die and applying induction heating to that part. A method for induction heating a cable conductor during extrusion mold connection of a cross-linked polyethylene insulated metal-coated cable, characterized by forming a magnetic field in a direction perpendicular to the opposite direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60084718A JPS61243679A (en) | 1985-04-19 | 1985-04-19 | Cable conductor induction heating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60084718A JPS61243679A (en) | 1985-04-19 | 1985-04-19 | Cable conductor induction heating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61243679A JPS61243679A (en) | 1986-10-29 |
| JPH0211987B2 true JPH0211987B2 (en) | 1990-03-16 |
Family
ID=13838458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60084718A Granted JPS61243679A (en) | 1985-04-19 | 1985-04-19 | Cable conductor induction heating |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61243679A (en) |
-
1985
- 1985-04-19 JP JP60084718A patent/JPS61243679A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61243679A (en) | 1986-10-29 |
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