JPH0132314Y2 - - Google Patents
Info
- Publication number
- JPH0132314Y2 JPH0132314Y2 JP12481584U JP12481584U JPH0132314Y2 JP H0132314 Y2 JPH0132314 Y2 JP H0132314Y2 JP 12481584 U JP12481584 U JP 12481584U JP 12481584 U JP12481584 U JP 12481584U JP H0132314 Y2 JPH0132314 Y2 JP H0132314Y2
- Authority
- JP
- Japan
- Prior art keywords
- metal pipe
- sheathed heater
- epoxy resin
- out terminal
- stress concentration
- 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
- 239000002184 metal Substances 0.000 claims description 17
- 238000007789 sealing Methods 0.000 claims description 11
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000000395 magnesium oxide Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 239000012777 electrically insulating material Substances 0.000 claims description 2
- 239000011347 resin Substances 0.000 claims 1
- 229920005989 resin Polymers 0.000 claims 1
- 239000003822 epoxy resin Substances 0.000 description 13
- 229920000647 polyepoxide Polymers 0.000 description 13
- 230000035882 stress Effects 0.000 description 10
- 230000008646 thermal stress Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
Landscapes
- Resistance Heating (AREA)
Description
【考案の詳細な説明】
〔考案の技術分野〕
本考案はシーズヒータの封口構造の改良に関す
るもので、その目的とするところは、熱的及び機
械的に強く信頼性の高い封口構造を提供せんとす
るものである。[Detailed description of the invention] [Technical field of the invention] The present invention relates to an improvement of the sealing structure of a sheathed heater, and its purpose is to provide a sealing structure that is thermally and mechanically strong and highly reliable. That is.
従来のシーズヒータの封口構造は第１図に示す
如く、金属パイプ１の中に取り出し端子３を接続
した発熱コイル２を挿入し、マグネシア粉末４を
充填したいわゆるシーズヒータの端部にゴム等の
弾性材料よりなるカツプ５を金属パイプ１の所定
位置に弾性力で装着し、該カツプ５内にエポキシ
樹脂６を注入し、加熱硬化させたものである。
The sealing structure of a conventional sheathed heater is as shown in Fig. 1, in which a heating coil 2 to which a lead terminal 3 is connected is inserted into a metal pipe 1, and the end of the so-called sheathed heater, which is filled with magnesia powder 4, is covered with rubber or the like. A cup 5 made of an elastic material is elastically attached to a predetermined position on the metal pipe 1, and an epoxy resin 6 is injected into the cup 5 and cured by heating.
以上のものにおいて、シーズヒータに通電する
と、発熱コイル２相当部の金属パイプ１の温度が
上昇する。この熱が熱伝導によつて封口部である
金属パイプ１の端部及びエポキシ樹脂６の温度も
当然温度上昇する。この様に温度上昇するとエポ
キシ樹脂６に熱応力が発生する。特にエポキシ樹
脂６の肉厚が急変する−線部分に応力集中が
生じる。すなわち肉厚ＴとT′との差が大きい事
と、金属パイプ１の端面Ａ部が直角になつている
事が応力集中の主原因となつている。この様に応
力集中が起こるとエポキシ樹脂６は−線でク
ラツクが発生し、封口が破壊され絶縁不良となる
欠点があつた。従つて使用に際してはエポキシ樹
脂６に応力集中が起きない様にエポキシ樹脂６の
温度上昇を押える必要がある。この方法としては
取り出し端子３の金属パイプ１の中に入つている
部分の長さｌを長くする事により熱伝導による熱
を小さくする事が一般に実施されているが、シー
ズヒータ全体の長さが長くなつて、装置が大形化
するばかりかコスト面でも高価となる不都合が生
じる。尚応力集中の一つの原因である金属パイプ
１の端面Ａ部が直角になつている事に対し、実際
に使用されている金属パイプ１の肉厚は0.4〜0.8
mm程度が主流で、この肉厚に対して外周を丸く面
取りしても直角とさほど変らず、応力集中を防止
できる程の効果は得られないものである。 In the above, when the sheathed heater is energized, the temperature of the metal pipe 1 corresponding to the heating coil 2 increases. As a result of this heat conduction, the temperature of the end portion of the metal pipe 1 and the epoxy resin 6, which are the sealing portions, naturally rises. When the temperature rises in this manner, thermal stress is generated in the epoxy resin 6. In particular, stress concentration occurs at the - line portion where the thickness of the epoxy resin 6 suddenly changes. That is, the main causes of stress concentration are the large difference between the wall thicknesses T and T' and the fact that the end surface A of the metal pipe 1 is at right angles. When stress concentration occurs in this way, the epoxy resin 6 has the drawback that cracks occur at the negative wire, the sealing is broken, and insulation becomes defective. Therefore, during use, it is necessary to suppress the temperature rise of the epoxy resin 6 so that stress concentration does not occur in the epoxy resin 6. In this method, the length l of the portion of the extraction terminal 3 inserted into the metal pipe 1 is generally increased to reduce the amount of heat caused by thermal conduction, but the overall length of the sheathed heater is As the length increases, the device not only becomes larger, but also becomes more expensive. Note that the end surface A of the metal pipe 1 is at a right angle, which is one of the causes of stress concentration, but the wall thickness of the metal pipe 1 actually used is 0.4 to 0.8.
mm is the mainstream, and for this wall thickness, even if the outer periphery is chamfered roundly, it will not be much different from a right angle chamfer, and it will not be effective enough to prevent stress concentration.
本考案は上述の欠点に対し、応力集中を緩和す
る封口構造とするために、金属パイプの端面に円
錐形のブツシユを装着することにより応力集中を
防止し、熱的に強い封口構造となしたものであ
る。
In order to solve the above-mentioned drawbacks, the present invention has a sealing structure that alleviates stress concentration by attaching a conical bush to the end face of the metal pipe to prevent stress concentration and create a thermally strong sealing structure. It is something.
以下本考案の一実施例について説明する。第２
図は本考案の一実施例を示すもので、金属パイプ
１の端部に取り出し端子３を通して電気絶縁材料
例えば、シリコンゴムよりなる円錐形のブツシユ
７を装着してなるもので、円錐形の大径部は金属
パイプ１と略同一径とし、小径部は取り出し端子
３と略同一径となしたものである。このブツシユ
７をエポキシ樹脂６内に包含した構造となつてい
る。その他の部分は第１図に示す従来構造と同じ
である。以上の様にブツシユ７により金属パイプ
１の端面から取り出し端子３迄をテーパ状となし
た事によりエポキシ樹脂６の肉厚の急変を防止で
き、又金属パイプ１の端面のエツジも無くすこと
もできる。従つてエポキシ樹脂６の温度上昇によ
る熱応力の応力集中が緩和され、ゆえに応力集中
によるエポキシ樹脂６のクラツク発生が防止で
き、より高い温度域まで使用可能とすることがで
きる。また、このことは取り出し端子３の金属パ
イプ１内に入つている寸法ｌを短く構成すること
が可能となることであり、シーズヒータの全体寸
法を小さくでき、装置全体の寸法も小形化が計
れ、コスト的にも安価なシーズヒータが得られ
る。
An embodiment of the present invention will be described below. Second
The figure shows an embodiment of the present invention, in which a conical bush 7 made of an electrically insulating material, such as silicone rubber, is attached to the end of a metal pipe 1 through a lead-out terminal 3. The diameter portion has approximately the same diameter as the metal pipe 1, and the small diameter portion has approximately the same diameter as the lead-out terminal 3. The structure is such that this bush 7 is contained within the epoxy resin 6. Other parts are the same as the conventional structure shown in FIG. As described above, by tapering the area from the end surface of the metal pipe 1 to the take-out terminal 3 using the bush 7, sudden changes in the wall thickness of the epoxy resin 6 can be prevented, and edges on the end surface of the metal pipe 1 can also be eliminated. . Therefore, stress concentration of thermal stress due to temperature rise in the epoxy resin 6 is alleviated, and therefore cracks in the epoxy resin 6 due to stress concentration can be prevented, and the epoxy resin 6 can be used up to a higher temperature range. In addition, this makes it possible to shorten the length l of the take-out terminal 3 that is inserted into the metal pipe 1, which allows the overall size of the sheathed heater to be reduced, and the overall size of the device to be smaller. , an inexpensive sheathed heater can be obtained.
この様に本考案によれば、熱的に強い構造が得
られ、低温域はもちろんの事、高温域においても
信頼性の高い封口構造が得られるもので、極めて
実用価値大なるシーズヒータを提供できる。
As described above, according to the present invention, a thermally strong structure can be obtained, and a highly reliable sealing structure can be obtained not only in low temperature ranges but also in high temperature ranges, providing a sheathed heater with extremely high practical value. can.
第１図は従来のシーズヒータの封口構造を示す
要部断面図、第２図は本考案によるシーズヒータ
の封口構造を示す要部断面図である。
図中、１は金属パイプ、２は発熱コイル、３は
取り出し端子、４はマグネシア粉末、５はカツ
プ、６はエポキシ樹脂、７はブツシユである。な
お、図中同一符号は同一又は相当部分を示す。
FIG. 1 is a sectional view of a main part showing a sealing structure of a conventional sheathed heater, and FIG. 2 is a sectional view of a main part showing a sealing structure of a sheathed heater according to the present invention. In the figure, 1 is a metal pipe, 2 is a heating coil, 3 is a take-out terminal, 4 is magnesia powder, 5 is a cup, 6 is an epoxy resin, and 7 is a bush. Note that the same reference numerals in the figures indicate the same or equivalent parts.
Claims (1)
コイルを挿入し、マグネシア粉末を充填してなる
シーズヒータの端部に前記取り出し端子を通して
電気絶縁材料よりなる円錐形のブツシユを装着
し、該ブツシユをつつみ込んで金属パイプ端部開
口部を耐熱絶縁樹脂で封口した事を特徴とするシ
ーズヒータの封口構造。 A heating coil with a lead-out terminal connected to it is inserted into a metal pipe, and a conical bush made of electrically insulating material is attached to the end of a sheathed heater filled with magnesia powder through the lead-out terminal, and the bush is wrapped. A sealed structure for a sheathed heater characterized by sealing the end opening of a metal pipe with a heat-resistant insulating resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12481584U JPS6139882U (en) | 1984-08-16 | 1984-08-16 | Sealed heater sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12481584U JPS6139882U (en) | 1984-08-16 | 1984-08-16 | Sealed heater sealing structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6139882U JPS6139882U (en) | 1986-03-13 |
| JPH0132314Y2 true JPH0132314Y2 (en) | 1989-10-03 |
Family
ID=30683523
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12481584U Granted JPS6139882U (en) | 1984-08-16 | 1984-08-16 | Sealed heater sealing structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6139882U (en) |
-
1984
- 1984-08-16 JP JP12481584U patent/JPS6139882U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6139882U (en) | 1986-03-13 |
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