JPH0143993B2 - - Google Patents
Info
- Publication number
- JPH0143993B2 JPH0143993B2 JP24044383A JP24044383A JPH0143993B2 JP H0143993 B2 JPH0143993 B2 JP H0143993B2 JP 24044383 A JP24044383 A JP 24044383A JP 24044383 A JP24044383 A JP 24044383A JP H0143993 B2 JPH0143993 B2 JP H0143993B2
- Authority
- JP
- Japan
- Prior art keywords
- resin
- heat
- resistant insulating
- insulating resin
- metal pipe
- 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
Landscapes
- Resistance Heating (AREA)
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明はシーズヒータの封口方法に関するもの
で、特に耐熱絶縁樹脂で封口するものにおけるシ
ーズヒータの封口方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for sealing a sheathed heater, and more particularly to a method for sealing a sheathed heater that is sealed with a heat-resistant insulating resin.
従来、この種シーズヒータの封口方法は、第１
図に示す如く、金属パイプ１内に電熱線２と端子
３を接続したものを挿入してマグネシア粉末４を
充填した後、金属パイプ１の端部開口に流動性の
耐熱絶縁樹脂５を注入し、その後加熱炉内で加熱
して前記樹脂５を硬化させてなるものである。
Conventionally, the sealing method for this type of sheathed heater has been
As shown in the figure, after inserting a heating wire 2 and a terminal 3 connected into a metal pipe 1 and filling it with magnesia powder 4, a fluid heat-resistant insulating resin 5 is injected into the end opening of the metal pipe 1. Then, the resin 5 is cured by heating in a heating furnace.
この様なものにおいて耐熱絶縁樹脂５はシリコ
ン樹脂あるいはエポキシ樹脂等であるが、一般に
表面張力が大なるため、注入した時第１図に示す
如く金属パイプ１及び端子３に対してはヌレ性が
悪く、樹脂表面はフラツトか若干凸状となる。こ
の様な状態で加熱硬化させると耐熱絶縁樹脂５は
若干収縮するために構造的に樹脂表面が不安な形
状となつているので、第２図に示すクラツクイあ
るいはロが発生する不具合があつた。 In such a product, the heat-resistant insulating resin 5 is made of silicone resin or epoxy resin, but generally has a large surface tension, so when it is injected, it does not wet the metal pipe 1 and the terminal 3 as shown in FIG. Unfortunately, the resin surface becomes flat or slightly convex. When heated and cured in such a state, the heat-resistant insulating resin 5 shrinks a little, resulting in a structurally unstable resin surface, resulting in problems such as cracks or cracks as shown in FIG. 2.
このクラツクはときには貫通しているものもあ
るし、仮りに貫通してなくとも使用中のヒートサ
イクルにより進行して貫通に至ることもある。こ
の様にクラツクが貫通したものにおいて大気中の
湿気が進入し、内部のマグネシア粉末４を吸湿さ
せて絶縁不良となる極めて不具合なものであつ
た。 Sometimes these cracks are penetrating, and even if they are not penetrating, they may progress due to the heat cycle during use and become penetrating. When a crack penetrates in this manner, moisture from the atmosphere enters and causes the magnesia powder 4 inside to absorb moisture, resulting in poor insulation, which is extremely problematic.
本発明は以上の不具合に対し、クラツクが発生
しない封口方法を提供し、品質の安定した信頼性
の高いシーズヒータを得ようとするものである。
The present invention aims to solve the above problems by providing a sealing method that does not cause cracks, and to obtain a sheathed heater with stable quality and high reliability.
以下本発明について詳述すると、第１図に示す
ごとく耐熱絶縁樹脂５を金属パイプ１の端部開口
に注入した後、第３図に示す如く金属棒１０を注
入した樹脂５内に入れ金属パイプ１の内面に沿つ
て矢印の如くかき廻す。その後加熱炉に入れて耐
熱絶縁樹脂５を硬化させてなるものである。この
ように耐熱絶縁樹脂５を注入した後、金属棒１０
を樹脂５内に入れ、金属棒１０を金属パイプ１の
内面に沿つてかき廻すことによつて第３図に示す
如く注入面より端部側の金属パイプ１内面及び端
子３の外面にヌレ面ハ，ニが形成される。その後
金属棒１０を抜き取つて加熱炉で加熱して硬化さ
せることにより第４図の様な形状に封口される。
この様に耐熱絶縁樹脂５の表面はヌレ面ハ，ニが
形成されることにより加熱時の樹脂５の収縮に対
してもヌレ面ハ，ニにスムーズに張力が働き、ク
ラツクの発生は起きない構造となる。すなわち、
ヌレ面ハ，ニが形成された構造的に極めて安定し
た形状になつているため、樹脂５の収縮に対して
も追従が良い構造が得られる。
The present invention will be described in detail below. After a heat-resistant insulating resin 5 is injected into the end opening of a metal pipe 1 as shown in FIG. 1, a metal rod 10 is placed inside the injected resin 5 as shown in FIG. Scrape it along the inner surface of 1 in the direction of the arrow. Thereafter, the heat-resistant insulating resin 5 is cured in a heating furnace. After injecting the heat-resistant insulating resin 5 in this way, the metal rod 10
is placed in the resin 5 and the metal rod 10 is moved along the inner surface of the metal pipe 1 to form a wet surface on the inner surface of the metal pipe 1 and the outer surface of the terminal 3 on the end side of the injection surface as shown in FIG. C and D are formed. Thereafter, the metal rod 10 is taken out and heated in a heating furnace to harden it, thereby sealing it into the shape shown in FIG. 4.
In this way, since the wet surfaces C and D are formed on the surface of the heat-resistant insulating resin 5, even when the resin 5 contracts during heating, tension acts smoothly on the wet surfaces C and D, and no cracks occur. It becomes a structure. That is,
Since it has a structurally extremely stable shape with wetted surfaces C and D, a structure that can easily follow the shrinkage of the resin 5 can be obtained.
以上本発明の封口方法によればクラツクの発生
がない封口方法が得られ、歩留りが良い生産がで
き、品質の安定した極めて信頼性の高いシーズヒ
ータを得ることができるものである。
As described above, according to the sealing method of the present invention, a sealing method that does not cause cracks can be obtained, production can be performed with good yield, and a sheathed heater with stable quality and extremely high reliability can be obtained.
第１図、第２図は従来の封口方法を示すもの
で、第１図は途中工程を示す要部断面図、第２図
はその封口完了後を示す端面図である。第３図、
第４図は本発明の封口方法を示すもので、第３図
は途中工程を示す要部断面図、第４図はその封口
完了後を示す要部断面図である。
図中、１は金属パイプ、２は発熱線、３は端
子、４はマグネシア粉末、５は耐熱絶縁樹脂、１
０は金属棒を示す。
1 and 2 show a conventional sealing method, with FIG. 1 being a cross-sectional view of a main part showing an intermediate step, and FIG. 2 being an end view showing the process after the sealing is completed. Figure 3,
FIG. 4 shows the sealing method of the present invention, FIG. 3 is a cross-sectional view of the main part showing an intermediate step, and FIG. 4 is a cross-sectional view of the main part after the sealing is completed. In the figure, 1 is a metal pipe, 2 is a heating wire, 3 is a terminal, 4 is magnesia powder, 5 is a heat-resistant insulating resin, 1
0 indicates a metal bar.
Claims (1)
前記電熱線からの端子を導出し、この導出部分に
耐熱絶縁樹脂を所要量注入した後、金属棒等で前
記樹脂をかきまぜて注入面より端部側の金属パイ
プ内面及び端子の外面に樹脂を付着させた後、加
熱して耐熱絶縁樹脂を硬化させることを特徴とす
るシーズヒータの封口方法。1 Lead out the terminal from the heating wire through the opening at the end of the metal pipe into which the heating wire is inserted, and inject the required amount of heat-resistant insulating resin into this lead-out portion, then stir the resin with a metal rod or the like and pour it from the injection surface. A method for sealing a sheathed heater, which comprises applying resin to the inner surface of a metal pipe on the end side and the outer surface of a terminal, and then heating to harden the heat-resistant insulating resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24044383A JPS60131788A (en) | 1983-12-20 | 1983-12-20 | Method of sealing sheathed heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24044383A JPS60131788A (en) | 1983-12-20 | 1983-12-20 | Method of sealing sheathed heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60131788A JPS60131788A (en) | 1985-07-13 |
| JPH0143993B2 true JPH0143993B2 (en) | 1989-09-25 |
Family
ID=17059567
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24044383A Granted JPS60131788A (en) | 1983-12-20 | 1983-12-20 | Method of sealing sheathed heater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60131788A (en) |
-
1983
- 1983-12-20 JP JP24044383A patent/JPS60131788A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60131788A (en) | 1985-07-13 |
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