JPS6136357B2 - - Google Patents
Info
- Publication number
- JPS6136357B2 JPS6136357B2 JP14830777A JP14830777A JPS6136357B2 JP S6136357 B2 JPS6136357 B2 JP S6136357B2 JP 14830777 A JP14830777 A JP 14830777A JP 14830777 A JP14830777 A JP 14830777A JP S6136357 B2 JPS6136357 B2 JP S6136357B2
- Authority
- JP
- Japan
- Prior art keywords
- heating wire
- wire coil
- terminal bar
- sheathed
- terminal
- 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
Links
- 238000010438 heat treatment Methods 0.000 claims description 57
- 239000002184 metal Substances 0.000 claims description 35
- 229910052751 metal Inorganic materials 0.000 claims description 35
- 239000000615 nonconductor Substances 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 description 10
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910001120 nichrome Inorganic materials 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Landscapes
- Resistance Heating (AREA)
Description
【発明の詳細な説明】
本発明は、シーズヒータに係り、特に端子棒と
発熱線コイルの接続に関するもので、シーズヒー
タ製造過程で加わる張力により、端子棒と発熱線
コイルの接続部で発熱線コイルの一部が端子棒か
ら外れるのを防止することを目的とるものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheathed heater, and particularly relates to the connection between a terminal bar and a heating wire coil. The purpose is to prevent part of the coil from coming off the terminal bar.
シーズヒータは、外覆金属パイプの中心に端子
棒と発熱線コイルを接続した完成電熱線を配し、
その周囲に耐熱性電気絶縁物が充填されている。
その製造方法は、外覆金属パイプの中心に発熱線
コイルの両端に端子棒を接続した完成電熱線を配
設し、その周囲に耐熱性電気絶縁物を充填する。
その後、外覆金属パイプと、このパイプ内に配設
されている完成電熱線、耐熱性電気絶縁物を同時
に減径し、シーズヒータが完成される。 A sheathed heater has a completed heating wire connected to a terminal bar and a heating wire coil in the center of a covered metal pipe.
The surrounding area is filled with heat-resistant electrical insulation.
The manufacturing method is to place a completed heating wire in which terminal rods are connected to both ends of a heating wire coil in the center of a covered metal pipe, and to fill the surrounding area with a heat-resistant electrical insulator.
Thereafter, the sheathed heater is completed by simultaneously reducing the diameter of the sheathed metal pipe, the completed heating wire, and the heat-resistant electric insulator disposed inside the pipe.
前記シーズヒータの製造に用いる従来の完成電
熱線を第１図に示す。１はニクロム線等から成る
発熱線コイルである。２は該発熱線コイル１の両
端に取付けた金属製の端子棒で鉄、ステンレス鋼
等で作られている。該端子棒２は、一方がネジき
りされているネジ部３を有している。前記発熱線
コイル１と該端子棒２との接続は該端子棒２のネ
ジ部３に前記発熱線コイル１を一定回数ネジ込
み、その後、溶接で該端子棒２と発熱線コイル１
とを溶着固定する。なお、４は端子棒２と発熱線
コイル１との溶着部である。このようにして、発
熱線コイル１の両端に端子棒２を取付け、完成電
熱線を作つている。シーズヒータの製造過程にお
いて、外覆金属パイプの中心に前記完成電熱線を
配し、その周囲に耐熱性電気絶縁物、例えばマグ
ネシア等を充てんする際、前記発熱線コイル１は
第２図に示す如く強く引き伸ばされる。このた
め、発熱線コイル１は、端子棒２に設けられてい
るネジ部３の先端から一部外れる。又、外覆金属
パイプ内の前記完成電熱線及び耐熱性絶縁材料と
ともに外覆金属パイプを大きく減径すると、外覆
金属パイプは、15〜20％伸びる。この時、同時に
前記発熱線コイル１も強く引き伸ばされるため、
該発熱線コイル１は端子棒２のネジ部３の先端か
ら外れるという欠点があつた。 A conventional completed heating wire used in manufacturing the sheathed heater is shown in FIG. 1 is a heating wire coil made of nichrome wire or the like. Reference numeral 2 denotes metal terminal rods attached to both ends of the heating wire coil 1, which are made of iron, stainless steel, or the like. The terminal bar 2 has a threaded portion 3 with one end threaded. The heating wire coil 1 and the terminal bar 2 are connected by screwing the heating wire coil 1 into the threaded portion 3 of the terminal bar 2 a certain number of times, and then welding the heating wire coil 1 to the terminal bar 2.
Weld and fix. Note that 4 is a welded portion between the terminal bar 2 and the heating wire coil 1. In this way, the terminal rods 2 are attached to both ends of the heating wire coil 1 to produce a completed heating wire. In the manufacturing process of a sheathed heater, when the completed heating wire is placed in the center of the sheathed metal pipe and the surrounding area is filled with a heat-resistant electrical insulator such as magnesia, the heating wire coil 1 is formed as shown in FIG. It's like being stretched out so strongly. For this reason, the heating wire coil 1 is partially removed from the tip of the threaded portion 3 provided on the terminal bar 2. Further, when the diameter of the sheathed metal pipe is greatly reduced together with the completed heating wire and the heat-resistant insulating material in the sheathed metal pipe, the sheathed metal pipe is elongated by 15 to 20%. At this time, the heating wire coil 1 is also strongly stretched, so
The heating wire coil 1 had the disadvantage that it could come off the tip of the threaded portion 3 of the terminal bar 2.
端子棒２のネジ部３の先端から発熱線コイル１
が製造過程で外れることにより、完成電熱線の電
気抵抗やが設定値より３〜６％程度高くなり電気
抵孔にばらつきが生じた。 The heating wire coil 1 is connected from the tip of the threaded part 3 of the terminal bar 2.
As a result of this coming off during the manufacturing process, the electrical resistance of the completed heating wire was approximately 3 to 6% higher than the set value, resulting in variations in electrical resistance.
これを防止するため、端子棒２と発熱線コイル
１との溶着部４をネジ部３の内側先端近傍に設け
ることにより、端子棒２から発熱線コイル１が外
れるといつた欠点は改善される。しかし、溶着時
に発熱線コイル１が変形されているため、発熱線
コイル１に張力が加わつた場合、発熱線コイル１
の溶着部４に直接張力が加わるため、端子棒２と
発熱線コイル１との溶着部４で発熱線コイル１が
断線するものが製造過程で発生する問題が生じ
た。 To prevent this, the welded part 4 between the terminal bar 2 and the heating wire coil 1 is provided near the inner tip of the threaded part 3, thereby improving the drawback that the heating wire coil 1 may come off from the terminal bar 2. . However, since the heating wire coil 1 is deformed during welding, if tension is applied to the heating wire coil 1, the heating wire coil 1
Since tension is directly applied to the welded portion 4 of the terminal bar 2, a problem has arisen in which the heating wire coil 1 may be disconnected at the welded portion 4 of the terminal bar 2 and the heating wire coil 1 during the manufacturing process.
本発明は、前記従来の欠点を解消し、端子棒と
発熱線コイルとの接続部で発熱線コイルの一部分
がシーズヒータ製造過程で加わる張力によつて、
外れるのを防止した完成電熱線を用いたシーズヒ
ータを提供するものである。 The present invention solves the above-mentioned conventional drawbacks, and the part of the heating wire coil at the connection part between the terminal bar and the heating wire coil is heated by the tension applied during the manufacturing process of the sheathed heater.
To provide a sheathed heater using a completed heating wire that is prevented from coming off.
第３図は本発明一実施例を示すシーズヒータの
断面図である。この第３図において、１１は発熱
線コイルであり、１２は一端にネジ部１３を有す
る端子棒である。発熱線コイル１１の両端部は端
子棒１２のネジ部１３に一定回数ネジ込まれてい
る。１４はネジ部１３にネジ込まれた部分の発熱
線コイル１１の外周に設けられた金属管で、この
金属管１４の内径はネジ込まれた部分の発熱線コ
イル１１の外径と同もしくはわずかに大きい寸法
に作られている。つまり製造過程において発熱線
コイル１１に加わる引き伸ばし力によつて、発熱
線コイル１１の一部が端子棒１２のネジ部１３の
ネジ山を越えることがない間隙となる内径に作ら
れている。またこの金属管１４は端子棒１２の膨
張係数より小さい膨張係数の金属よりなる。さら
にこの金属管１４および発熱線コイル１１は端子
棒１２に溶着固定されている。なお、１５は溶着
部分を示す。１６は外覆金属パイプである。発熱
線コイル１１と端子棒１２と金属管１４よりなる
完成電熱線と外覆金属パイプ１６間には耐熱性電
気絶縁物１７、例えばマグネシアが充填され、さ
らに、外覆金属パイプ１６端部は封口材１８によ
り封口されている。 FIG. 3 is a sectional view of a sheathed heater showing an embodiment of the present invention. In FIG. 3, 11 is a heating wire coil, and 12 is a terminal bar having a threaded portion 13 at one end. Both ends of the heating wire coil 11 are screwed into the threaded portion 13 of the terminal bar 12 a certain number of times. Reference numeral 14 denotes a metal tube provided around the outer periphery of the heating wire coil 11 at the portion screwed into the threaded portion 13, and the inner diameter of this metal tube 14 is the same as or slightly smaller than the outer diameter of the heating wire coil 11 at the screwed portion. It is made to large dimensions. That is, due to the stretching force applied to the heating wire coil 11 during the manufacturing process, a part of the heating wire coil 11 is made to have an inner diameter that is a gap that does not exceed the thread of the threaded portion 13 of the terminal bar 12. Further, the metal tube 14 is made of a metal whose expansion coefficient is smaller than that of the terminal rod 12. Further, the metal tube 14 and the heating wire coil 11 are welded and fixed to the terminal bar 12. Note that 15 indicates a welded portion. 16 is a sheathed metal pipe. A heat-resistant electrical insulator 17, such as magnesia, is filled between the completed heating wire consisting of the heating wire coil 11, the terminal bar 12, and the metal tube 14 and the sheathed metal pipe 16, and the end of the sheathed metal pipe 16 is sealed. It is sealed with a material 18.
上記構成から明らかなように端子棒１２に発熱
線コイル１１を接続した完成電熱線は、シーズヒ
ータ製造過程において張力が加えられても金属管
１４により端子棒１２のネジ部１３のネジ溝から
外れることがない。第３図に示す金属管１４の代
わりにリボン状の金属板を発熱線コイル１１上に
巻き付け、前記同様に溶着してもよい。また、金
属管１４を端子棒１２の膨張係数より小さい膨張
係数を有する金属で形成することにより、シーズ
ヒータ使用時に端子棒１２と発熱線コイル１１の
接続はより一層強固となる。 As is clear from the above configuration, the completed heating wire in which the heating wire coil 11 is connected to the terminal bar 12 does not come off the threaded groove of the threaded portion 13 of the terminal bar 12 due to the metal tube 14 even if tension is applied during the sheathed heater manufacturing process. Never. Instead of the metal tube 14 shown in FIG. 3, a ribbon-shaped metal plate may be wound around the heating wire coil 11 and welded in the same manner as described above. Further, by forming the metal tube 14 from a metal having an expansion coefficient smaller than that of the terminal bar 12, the connection between the terminal bar 12 and the heating wire coil 11 becomes even stronger when the sheathed heater is used.
以上のように本発明のシーズヒータは、端子棒
の内側端部にネジ部を設け、このネジ部に発熱線
コイルを螺入し、この螺入した発熱線コイルの螺
入部の外周を覆う金属管を設け、この金属管を前
記端子棒に溶着固定しているため、シーズヒータ
の製造過程において、外覆金属パイプに耐熱性電
気絶縁物を充填したり、外覆金属パイプを減径し
たりする場合に、発熱線コイルが引き伸ばされた
としても、この発熱線コイルの端子棒からの外れ
は、金属管の存在により確実に防止することがで
き、その結果、製造歩留りを向上さることがで
き、また記金属管は外覆金属パイプの減径時に同
時に減径されるため、端子棒と発熱線コイルの接
続がさらに確実となるものである。 As described above, in the sheathed heater of the present invention, a threaded part is provided at the inner end of the terminal bar, a heating wire coil is screwed into this threaded part, and a metal covering the outer periphery of the threaded part of the threaded heating wire coil is provided. A tube is provided and this metal tube is welded and fixed to the terminal rod, so during the manufacturing process of the sheathed heater, there is no need to fill the sheathed metal pipe with a heat-resistant electrical insulator or reduce the diameter of the sheathed metal pipe. In this case, even if the heating wire coil is stretched, the presence of the metal tube can reliably prevent the heating wire coil from coming off the terminal bar, and as a result, the manufacturing yield can be improved. Moreover, since the diameter of the metal tube is reduced at the same time as the outer metal pipe is reduced in diameter, the connection between the terminal bar and the heating wire coil becomes more reliable.
１図は従来のシーズヒータに用いられた完成電
熱線の断面図、第２図は同完成電熱線を引き伸ば
した状態の断面図、第３図は本発明の一実施例を
示すシーズヒータの断面図である。
１１……発熱線コイル、１２……端子棒、１３
……ネジ部、１４……金属管、１６……外覆金属
パイプ、１７……耐熱性電気絶縁物。
Fig. 1 is a sectional view of a completed heating wire used in a conventional sheathed heater, Fig. 2 is a sectional view of the completed heating wire in a stretched state, and Fig. 3 is a sectional view of a sheathed heater showing an embodiment of the present invention. It is a diagram. 11... Heating wire coil, 12... Terminal bar, 13
... Threaded portion, 14 ... Metal pipe, 16 ... Sheathed metal pipe, 17 ... Heat-resistant electrical insulator.
Claims (1)
覆金属パイプの間に耐熱性電気絶縁物を充填し減
径してなるシーズヒータにおいて、端子棒の内側
端部にネジ部を設け、このネジ部に発熱線コイル
を螺入し、この螺入した発熱線コイルの螺入部の
外周を覆う金属管を設け、この金属管を前記端子
棒に溶着固定したことを特徴とするシーズヒー
タ。 ２ 金属管の膨張係数が端子棒の膨張係数より小
さいことを特徴とする特許請求の範囲第１項に記
載のシーズヒータ。[Claims] 1. In a sheathed heater formed by filling a heat-resistant electrical insulator between a heating wire coil and a sheathed metal pipe to which terminal rods are connected at both ends to reduce the diameter, the inner end of the terminal rod A threaded portion is provided, a heating wire coil is screwed into the threaded portion, a metal tube is provided to cover the outer periphery of the threaded portion of the screwed heating wire coil, and this metal tube is welded and fixed to the terminal bar. A sheathed heater. 2. The sheathed heater according to claim 1, wherein the expansion coefficient of the metal tube is smaller than the expansion coefficient of the terminal bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14830777A JPS5481541A (en) | 1977-12-09 | 1977-12-09 | Sheath heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14830777A JPS5481541A (en) | 1977-12-09 | 1977-12-09 | Sheath heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5481541A JPS5481541A (en) | 1979-06-29 |
| JPS6136357B2 true JPS6136357B2 (en) | 1986-08-18 |
Family
ID=15449850
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14830777A Granted JPS5481541A (en) | 1977-12-09 | 1977-12-09 | Sheath heater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5481541A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01159227A (en) * | 1987-12-17 | 1989-06-22 | Sumitomo Heavy Ind Ltd | Mold protecting device for braking and clamping device of mold using servomotor |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4532769B2 (en) * | 2001-03-23 | 2010-08-25 | 積水化学工業株式会社 | Manufacturing method of electrofusion joint |
| JP6373132B2 (en) * | 2014-09-11 | 2018-08-15 | 新熱工業株式会社 | Electric heater and method of manufacturing electric heater |
-
1977
- 1977-12-09 JP JP14830777A patent/JPS5481541A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01159227A (en) * | 1987-12-17 | 1989-06-22 | Sumitomo Heavy Ind Ltd | Mold protecting device for braking and clamping device of mold using servomotor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5481541A (en) | 1979-06-29 |
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