JPH06101379B2 - Variable high frequency induction heating coil - Google Patents
Variable high frequency induction heating coilInfo
- Publication number
- JPH06101379B2 JPH06101379B2 JP25800085A JP25800085A JPH06101379B2 JP H06101379 B2 JPH06101379 B2 JP H06101379B2 JP 25800085 A JP25800085 A JP 25800085A JP 25800085 A JP25800085 A JP 25800085A JP H06101379 B2 JPH06101379 B2 JP H06101379B2
- Authority
- JP
- Japan
- Prior art keywords
- coil
- pipe
- frequency induction
- paragraph
- induction 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
Description
【発明の詳細な説明】 〔発明の利用分野〕 本発明は配管等を外周面から加熱するに適する高周波誘
導加熱コイルに係り、更に詳しくは、コイル各ターン間
のギャップを可変にするためのコイル段し部の改良に関
する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency induction heating coil suitable for heating pipes and the like from the outer peripheral surface, and more specifically, a coil for varying the gap between coil turns. Regarding the improvement of the step.
円筒体、例えば配管等を外周面から加熱処理する必要の
あるとき、該配管の周りを高周波誘導コイルで囲んで、
高周波誘導電流によるうず電流で加熱をすることが屡々
行われる。When it is necessary to heat-treat a cylindrical body such as a pipe from the outer peripheral surface, surround the pipe with a high-frequency induction coil,
Heating with eddy current due to high frequency induction current is often performed.
例えばBWR（沸騰水型原子炉）プラントにおける原子炉
一次系を構成する配管は、従来からオーステナイト系ス
テンレス鋼が使用されているが、溶接部に於ける材料の
鋭敏化、残留高引張応力、環境条件の３因子の重畳によ
り溶接部に応力腐食割れが発生し、プラント稼動率の低
下を招いた事例があり、この応力腐食割れを防止すべく
上記３因子の内いずれか１因子を改善することが行わ
れ、例えば、そのための一手段として開発されたものに
特開昭53−38246号公報に記載される様な方法がある。
これは配管内面に冷却材を存在させつつ、配管溶接部外
面を高周波誘導によるうず電流で加熱する方法である。
これによって配管の内外面に温度差が発生し、配管溶接
部内面の残留高引張応力は圧縮応力に変わり、応力腐食
割れが防止される。上記配管溶接部を加熱する高周波誘
導加熱コイルは、特開昭52−130409号公報に記載のよう
に直管−直管組合せの円周溶接部や、特開昭58−9786号
公報に記載のように円周溶接部と形状を異にする母管に
対する管台取付溶接部に対して使用されてきた。For example, pipes that make up the primary reactor system in BWR (Boiling Water Reactor) plants have traditionally been made of austenitic stainless steel. In some cases, stress corrosion cracking occurred in the weld due to superposition of the three factors of the conditions, leading to a decrease in plant operation rate. To prevent this stress corrosion cracking, any one of the above three factors should be improved. For example, a method developed as one means therefor is a method described in JP-A-53-38246.
This is a method of heating the outer surface of the welded portion of the pipe with an eddy current by high frequency induction while allowing the coolant to exist on the inner surface of the pipe.
As a result, a temperature difference is generated between the inner and outer surfaces of the pipe, the residual high tensile stress on the inner surface of the welded portion of the pipe is changed to compressive stress, and stress corrosion cracking is prevented. The high-frequency induction heating coil for heating the pipe weld is a straight pipe-circular weld of a straight pipe combination as described in JP-A-52-130409, and JP-A-58-9786. Thus, it has been used for a nozzle mounting welding portion for a mother pipe having a shape different from that of the circumferential welding portion.
高周波誘導加熱コイルは一般に配管溶接部に対し同心円
状に巻回することが理想であり、また連続巻である為、
次のターンへ移行する為の段落し部を有している。Generally, it is ideal that the high-frequency induction heating coil be wound concentrically with the welded portion of the pipe, and since it is continuous winding,
It has a paragraph to move to the next turn.
第３図は高周波誘導加熱コイルの従来例を示す斜視図で
あって、コイルは同心円的に巻かれた一連の銅板１およ
びその裏面に接合された中空パイプ２（図では角型断面
パイプ）からなり、図中、３で示す部分が次のターンへ
移行するための段落し部である。中空パイプ２を通って
冷却流体が流入管５′から流出管５″へ流れるようにな
っている。コイル各ターンはコイル固定用の絶縁板６に
よってその相互の間隔（ギャップ）が保たれるように支
持されており、またコイルは半円周に分割されていて、
その各端部にコイル接合部４を有し、加熱対象たる配管
の周りに配設された後、これらコイル接合部４を互にク
ランプ（不図示）で挾持固定することにより、全円周的
に配管を取巻くコイルが形成されるようになっている。FIG. 3 is a perspective view showing a conventional example of a high frequency induction heating coil. The coil is composed of a series of concentrically wound copper plates 1 and a hollow pipe 2 (a rectangular cross-section pipe in the figure) joined to the back surface thereof. In the figure, the part indicated by 3 is a paragraph for shifting to the next turn. The cooling fluid flows from the inflow pipe 5'to the outflow pipe 5 "through the hollow pipe 2. The turns of the coils are maintained by the insulating plate 6 for fixing the coils so that the gaps therebetween are maintained. The coil is divided into half circles,
The coil joints 4 are provided at each end of the pipe, and the coil joints 4 are arranged around the pipe to be heated, and then the coil joints 4 are clamped and fixed to each other by clamps (not shown), so that the entire circumference can be obtained. The coil surrounding the pipe is formed.
第４図は加熱対象たる配管９の溶接部10を中心としてそ
の周囲に配設した高周波誘導加熱コイルを示す部分的概
要図であり、第５図はそれに対応する管軸方向の配管９
の加熱温度分布を示す。FIG. 4 is a partial schematic view showing a high-frequency induction heating coil arranged around the welded portion 10 of the pipe 9 to be heated, and FIG. 5 is a pipe 9 corresponding to the high-frequency induction heating coil.
3 shows the heating temperature distribution of.
一般にさまざまな形状の配管９の溶接部10を均一に加熱
するには、加熱対象たる配管９とコイルの空隙７をさま
ざまに変えるか、連続巻きコイルの間隔（ギャップ）８
を変化させる。従って、上記段落し部はコイルギャップ
８及びコイルターン幅によって段落し角度が変わり、さ
まざまな形状のコイルに対し、段落し角度を変えて製作
する必要がある。しかし、従来、コイルの段落し部と非
段落し部は一体構成であったため、コイル個々に対して
段落し角度を求め、銅板を切断して製作しなければなら
なかったので、製作時間、コストが掛り問題となってい
た。さらに配管溶接部の応力を改善するに適する温度分
布が得られない場合はコイル形状を変更しなければなら
ず、したがって段落し部の改造ひいては、コイル全体の
再製が必要であった。しかしコイルの再製はコイルの新
規製作と同等のコスト、時間が掛るという問題がある。Generally, in order to uniformly heat the welded portion 10 of the pipes 9 having various shapes, the air gap 7 between the pipe 9 to be heated and the coil is changed variously, or the gap (gap) 8 between the continuously wound coils is set.
Change. Therefore, the paragraph angle changes depending on the coil gap 8 and the coil turn width, and it is necessary to manufacture the coils having various shapes by varying the paragraph angle. However, in the past, since the paragraph and non-paragraph parts of the coil were integrally configured, it was necessary to obtain the paragraph angle for each coil and cut the copper plate to manufacture it. It was a problem. Further, when the temperature distribution suitable for improving the stress of the pipe welded portion cannot be obtained, the coil shape must be changed, and therefore, the remodeling of the paragraph and the remanufacturing of the entire coil were necessary. However, the remanufacturing of the coil has a problem that the cost and time are the same as those of the new manufacturing of the coil.
本発明の目的は、コイルの改造・再製を必要とせずに簡
単にコイル間ギャップを可変にできる高周波誘導加熱コ
イルを提供することにある。An object of the present invention is to provide a high frequency induction heating coil that can easily change the inter-coil gap without the need for modifying or remanufacturing the coil.
本発明の高周波誘導加熱コイルは、各コイルターン間の
段落し部を、各コイルターンの端部に着脱自在な段落し
形成用導体部材で構成したことにある。この段落し形成
用導体部材を種々作製しておき、これを取り替えること
によりコイルギャップを変えることができる。In the high frequency induction heating coil of the present invention, the paragraphs between the coil turns are formed by the paragraph forming conductor members that are detachably attached to the ends of the coil turns. The coil gap can be changed by preparing various conductor members for forming the paragraph and replacing them.
〔発明の実施例〕 次に本発明の一実施例を説明する。この実施例の構成は
段落し部３の構成以外は第３図に示したものと同様であ
る。Example of the Invention Next, an example of the present invention will be described. The structure of this embodiment is the same as that shown in FIG. 3 except for the structure of the paragraph 3.
すなわち、第１図は本実施例における段落し部を示した
図であって、コイルを構成する中空パイプ10の段落し部
での端部に端栓11を溶接し、これにＺ形導体板（例えば
銅製）12をボルト13で螺着固定することによって段落し
部を形成している。段差の異なるＺ形導体板12を製作し
ておき、これを取り替えることによって、コイルのギャ
ップ８を所望に変化させることができる。ボルト13およ
びＺ形導体板12はパイプ10内の冷却材によって冷却され
る。Ｚ形導体板12の長さをなるべく短くなるようにして
段落し部の冷却を有効ならしめることができる。That is, FIG. 1 is a view showing the paragraphs in this embodiment, in which the end plugs 11 are welded to the ends of the hollow pipes 10 constituting the coil at the paragraphs, and a Z-shaped conductor plate is attached to this. Paragraphs are formed by screwing and fixing (for example, copper) 12 with bolts 13. By manufacturing Z-shaped conductor plates 12 having different steps and replacing them, the gap 8 of the coil can be changed as desired. The bolt 13 and the Z-shaped conductor plate 12 are cooled by the coolant in the pipe 10. The length of the Z-shaped conductor plate 12 can be made as short as possible to effectively cool the paragraph.
第２図は本実施例の高周波誘導コイルで加熱したときの
加熱対象たる配管の軸方向温度分布を示す図であって、
実線15は非段落し部に面する配管部分の、また点線16は
段落し部に面する配管部分の温度を示す。図からわかる
ように、コイルの端附近で段落し部に面する配管部分の
温度が非段落し部に面するそれよりも若干低くなるが、
コイル中心附近での温度はいずれも同じである。FIG. 2 is a diagram showing an axial temperature distribution of a pipe to be heated when heated by the high frequency induction coil of this embodiment,
The solid line 15 indicates the temperature of the pipe portion facing the non-paragraph portion, and the dotted line 16 indicates the temperature of the pipe portion facing the paragraph portion. As can be seen from the figure, the temperature of the piping part facing the paragraph part near the end of the coil is slightly lower than that of the part facing the non-paragraph part,
The temperatures near the center of the coil are the same.
第６図，第７図は、第１図の如き段落し部形成用の銅板
12と第３図に示す如きコイル接合部４とを兼用した部材
を用いる実施例を示す。同部材の立面図を第６図
（ａ）、その平面図を第６図（ｂ）に示す。これは段落
し用Ｚ形導体板（例えば銅製）部12とコイル接合用の板
部４とをろう付け17して作ってもよいし、又は、プレス
で一体に作ってもよい。これを第７図に示すように、第
１図と同様にコイルの中空パイプ10にボルト13で固定
し、そのコイル接合用の板部４を相手方の中空パイプに
設けられたコイル接合部４に合せ、クランプ（不図示）
で締め付けて組立てる。Ｚ形導体板部12の形を種々に変
えた上記部材を製作しておき、これを取り替えることに
よってコイルギャップ８を変えることができる。6 and 7 are copper plates for forming the spilled portion as shown in FIG.
An embodiment using a member which also serves as 12 and the coil joint portion 4 as shown in FIG. An elevation view of the member is shown in FIG. 6 (a), and a plan view thereof is shown in FIG. 6 (b). This may be made by brazing 17 the Z-shaped conductor plate portion (for example, made of copper) 12 and the plate portion 4 for coil bonding, or may be made integrally by pressing. As shown in FIG. 7, this is fixed to the hollow pipe 10 of the coil with bolts 13 as in FIG. 1, and the plate portion 4 for coil joining is fixed to the coil joining portion 4 provided on the counterpart hollow pipe. Matching, clamp (not shown)
Tighten with to assemble. The coil gap 8 can be changed by manufacturing the above-mentioned member in which the shape of the Z-shaped conductor plate portion 12 is variously changed and replacing it.
第８図は、以上述べた本発明実施例においてコイルギャ
ップ８を変える場合に好適に用いられるコイルの各ター
ン固定用絶縁板６（第３図参照）の形態を示す。すなわ
ち、この絶縁板６は長孔を有しており、コイルギャップ
を変えるときは、この長孔に沿ってコイルターン固定位
置をずらせることによって容易に対応できる。FIG. 8 shows the form of the insulating plate 6 (see FIG. 3) for fixing each turn of the coil, which is preferably used when the coil gap 8 is changed in the embodiment of the present invention described above. That is, the insulating plate 6 has a long hole, and when changing the coil gap, it can be easily dealt with by shifting the coil turn fixing position along the long hole.
第９図はコイルの中空パイプ中に冷却流体を流すための
構成を示し、同図（ａ）は平面図（但し半分のみを図
示）、同図（ｂ）は側面図であって、コイル接合部４近
傍にてコイルの中空パイプ10と連通する冷却流体用ホー
ス14を図示の如く順次下段に至る如く接続し、図示の如
く一端から冷却流体を流入せしめ、他端から流出させ
る。FIG. 9 shows a structure for flowing a cooling fluid in the hollow pipe of the coil, FIG. 9 (a) is a plan view (however, only half is shown), and FIG. 9 (b) is a side view. A hose 14 for cooling fluid, which communicates with the hollow pipe 10 of the coil in the vicinity of the portion 4, is connected so as to sequentially reach the lower stage as shown in the drawing, and the cooling fluid is made to flow in from one end and flow out from the other end as shown in the drawing.
本発明によれば高周波誘導加熱コイルの形状、製作、組
立過程を単純化することができる。またコイルギャップ
を自由に可変にできるので、好適な所望の温度分布を得
る為に従来の如くコイルを大幅に改造したり再製したり
することは不要となる。さらに一つのコイルで対応でき
る配管溶接部形状の範囲を拡大することができるので、
コイルの少量化も可能である。According to the present invention, it is possible to simplify the shape, manufacturing and assembly process of the high frequency induction heating coil. Further, since the coil gap can be freely changed, it is not necessary to drastically modify or remanufacture the coil as in the conventional case in order to obtain a preferable desired temperature distribution. Furthermore, since the range of pipe welding part shapes that can be handled with one coil can be expanded,
It is also possible to reduce the number of coils.
第１図は本発明の１実施例に係るコイル段落し部を示す
図、第２図は同実施例による配管加熱温度分布を示す
図、第３図は従来の高周波誘導加熱コイルの斜視図、第
４図は第３図のコイルで配管を囲んだ状態を示す部分的
概要図、第５図は従来のコイルによる配管加熱温度分布
図、第６図（ａ），（ｂ）は本発明の他の実施例に係る
段落し兼コイル接合用の部材の立面図および平面図、第
７図は第６図の部材を用いたコイル段落し部と接合部を
示す図、第８図は本発明実施例に好適に用いられるコイ
ル固定用絶縁板の平面図、第９図（ａ），（ｂ）は冷却
流体を流す構成を示す平面図（半分）および側面図であ
る。 １…銅板、２…中空パイプ、 ３…段落し部、4,4′…コイル接合部、 ６…コイル固定用絶縁板、９…加熱対象配管、 10…中空パイプ、11…端栓、 12…Ｚ形銅板、13…ボルト。FIG. 1 is a diagram showing a coil step portion according to one embodiment of the present invention, FIG. 2 is a diagram showing a pipe heating temperature distribution according to the same embodiment, and FIG. 3 is a perspective view of a conventional high frequency induction heating coil, FIG. 4 is a partial schematic diagram showing a state in which the pipe is surrounded by the coil of FIG. 3, FIG. 5 is a pipe heating temperature distribution diagram by the conventional coil, and FIGS. 6 (a) and 6 (b) are the present invention. FIG. 7 is an elevational view and a plan view of a member for paragraph and coil joining according to another embodiment, FIG. 7 is a view showing a coil paragraph and a joint using the member of FIG. 6, and FIG. 9A and 9B are a plan view (half) and a side view showing a configuration for flowing a cooling fluid, respectively. DESCRIPTION OF SYMBOLS 1 ... Copper plate, 2 ... Hollow pipe, 3 ... Paragraph part, 4, 4 '... Coil joint part, 6 ... Insulation plate for coil fixing, 9 ... Pipe for heating, 10 ... Hollow pipe, 11 ... End plug, 12 ... Z-shaped copper plate, 13 ... Bolt.
Claims (1)
ターンの端部に着脱自在な段落し形成用導体部材で構成
したことを特徴とするギャップ可変型高周波誘導加熱コ
イル。1. A variable-gap high-frequency induction heating coil, characterized in that a paragraph between the coil turns is composed of a conductor member for forming a paragraph that can be attached to and detached from an end of each coil turn.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25800085A JPH06101379B2 (en) | 1985-11-18 | 1985-11-18 | Variable high frequency induction heating coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25800085A JPH06101379B2 (en) | 1985-11-18 | 1985-11-18 | Variable high frequency induction heating coil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62117292A JPS62117292A (en) | 1987-05-28 |
| JPH06101379B2 true JPH06101379B2 (en) | 1994-12-12 |
Family
ID=17314140
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25800085A Expired - Lifetime JPH06101379B2 (en) | 1985-11-18 | 1985-11-18 | Variable high frequency induction heating coil |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06101379B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0713913B2 (en) * | 1989-07-10 | 1995-02-15 | キヤノン株式会社 | High frequency heating coil and heating method using the same |
| JP7135892B2 (en) | 2019-01-25 | 2022-09-13 | トヨタ自動車株式会社 | INDUCTION HEATING APPARATUS AND INDUCTION HEATING METHOD FOR PLATE-LIKE MEMBER |
-
1985
- 1985-11-18 JP JP25800085A patent/JPH06101379B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62117292A (en) | 1987-05-28 |
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