JPS5947872B2 - Sea heater - Google Patents
Sea heaterInfo
- Publication number
- JPS5947872B2 JPS5947872B2 JP12155876A JP12155876A JPS5947872B2 JP S5947872 B2 JPS5947872 B2 JP S5947872B2 JP 12155876 A JP12155876 A JP 12155876A JP 12155876 A JP12155876 A JP 12155876A JP S5947872 B2 JPS5947872 B2 JP S5947872B2
- Authority
- JP
- Japan
- Prior art keywords
- heater
- metal pipe
- sheathed
- silicone resin
- skeleton
- 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)
- Silicon Polymers (AREA)
Description
【発明の詳細な説明】
本発明は吸湿によるシーズヒータの絶縁抵抗特性の改良
に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improving the insulation resistance characteristics of a sheathed heater due to moisture absorption.
従来のシーズヒーメは一般的に第１図に示すように金属
パイプ１と、端子棒２を溶接したコイル状ヒータ３との
間に電気絶縁材料４を充填している。As shown in FIG. 1, a conventional sheath heater generally has an electrically insulating material 4 filled between a metal pipe 1 and a coiled heater 3 to which a terminal bar 2 is welded.
この際、電気絶縁材料としてはマグネシア粉末が最も広
く使用されるが、マグネシア粉末は吸湿性があるため、
室内雰囲気で容易に吸湿し絶縁抵抗を劣化させるという
欠点があつた。そこで、このマグネシア粉末にシリコン
樹脂を混合した後加熱し、マグネシア粉末表面にシリコ
ン樹脂被膜を形成させることにより、充填材表面が撥水
性を持ち、外部の湿気を容易に吸湿しなくなり、絶縁性
能の劣化を防止する方法が提案されている。しかし、こ
の方法ではシリコン樹脂の耐熱温度が約３５０℃と低い
ため、高温使用後においてはシリコン樹脂の分解により
撥水性が低下し、室内雰囲気中で充填材が吸湿をおこし
、絶縁特性の劣化をおこしやすいという欠点があつた。
本発明は、かかる欠点を克服するもので、すなわちシー
ズヒーメの高温使用によつても絶縁特性が劣化しないよ
うに、電気絶縁材料に用いるマグネシア粉末など自体の
表面に高温加熱後も劣化しない撥水性を附与し、かつ長
期間の使用によつても変質しないシーズヒータを提供す
るものである。At this time, magnesia powder is most widely used as an electrical insulating material, but since magnesia powder is hygroscopic,
It has the disadvantage that it easily absorbs moisture in the indoor atmosphere and deteriorates insulation resistance. Therefore, by mixing silicone resin with this magnesia powder and heating it to form a silicone resin film on the surface of the magnesia powder, the surface of the filler becomes water repellent and does not easily absorb moisture from the outside, improving insulation performance. Methods have been proposed to prevent deterioration. However, with this method, the heat resistance of silicone resin is as low as approximately 350°C, so after high-temperature use, the silicone resin decomposes and water repellency decreases, and the filler absorbs moisture in the indoor atmosphere, causing deterioration of insulation properties. The drawback was that it was easy to wake up.
The present invention aims to overcome such drawbacks, and in order to prevent the insulating properties of sheathed heat from deteriorating even when used at high temperatures, the surface of magnesia powder used as an electrical insulating material has water repellency that does not deteriorate even after high temperature heating. The purpose of the present invention is to provide a sheathed heater that is flexible and does not deteriorate even after long-term use.
以下本発明の一実施例を第２図に基づいて説明すると、
第２図において、５はシーズヒータの外筐体を構成する
金属パイプで、その中央にはヒータ６を有し、かつこの
ヒータ６の両端にはそれぞれ金属パイプ５より突出する
端子棒Ｔを設けている。８は金属パイプ５内に充填され
たマグネシア粉末に ポリアルキレンオキシシロキサン
またはポリアリーレンオキシシロキサンを混合混和させ
た電気絶縁物である。An embodiment of the present invention will be described below based on FIG. 2.
In FIG. 2, reference numeral 5 denotes a metal pipe constituting the outer casing of the sheathed heater, which has a heater 6 in its center, and terminal rods T protruding from the metal pipe 5 at both ends of the heater 6. ing. 8 is an electrical insulator made by mixing polyalkyleneoxysiloxane or polyaryleneoxysiloxane with magnesia powder filled in the metal pipe 5.
上記の如く作られたシーズヒーメに通電する事により、
混合附与された上記ポリアルキレンオキシシロキサンま
たはポリアリーレンオキシシロキサンなどの樹脂は加熱
され粘度が低下しマグネシア表面に被着し充填材に撥水
性層を形成する。By energizing the sheathed heat made as above,
The mixed and applied resin, such as polyalkyleneoxysiloxane or polyaryleneoxysiloxane, is heated to reduce its viscosity and adhere to the surface of magnesia, forming a water-repellent layer on the filler.
かかるポリアルキレンオキシシロキサンまたはポリアリ
ーレンオキシシロキサンは従来のシリコン樹脂中のＳｉ
−Ｏ骨格を、Ｓｉ−Ｏ−Ａｒ−Ｏ骨格（Ａｒはアリーレ
ン基またはアルキレン基を示す）に変換したものである
。このようにシロキサン連鎖にアルキレンオキシ基、ア
リーレンオキシ基を組み込んだ樹脂仄 そのＡｒ／Ｓｉ
が０．１〜１．０のものでシリコン樹脂に較べ熱的に安
定となるたへ シリコン樹脂よりも高温に耐えられる撥
水性媚旨である。本樹脂を０．１〜１０ｗｔ％被着させ
たマグネシアを絶縁材料として用いたシーズヒータはシ
リコン樹脂を被着させた絶縁材料を用いたものより耐熱
、撥水性が高く５００℃に耐えられるものが得られた。
以上のように、本発明シーズヒータは金属パイプ内にヒ
ータおよび端子部を絶縁保持する充填材料の粒子表面に
ポリアルキレンオキシシロキサンまたはポリアリーレン
オキシシロキサン層を施しているため、撥水性を持ち、
かつ高温に充填材が加熱された後も撥水性を失わない。Such polyalkyleneoxysiloxanes or polyaryleneoxysiloxanes are Si in conventional silicone resins.
-O skeleton is converted to Si-O-Ar-O skeleton (Ar represents an arylene group or an alkylene group). In this way, the Ar/Si
It has a water repellency of 0.1 to 1.0 and is more thermally stable than silicone resin. Sheathed heaters using magnesia coated with 0.1 to 10 wt% of this resin as an insulating material have higher heat resistance and water repellency than those using insulating materials coated with silicone resin, and can withstand temperatures of 500°C. Obtained.
As described above, the sheathed heater of the present invention has water repellency because a polyalkyleneoxysiloxane or polyaryleneoxysiloxane layer is applied to the surface of the particles of the filler material that insulates and holds the heater and terminal portion within the metal pipe.
Moreover, the filler does not lose its water repellency even after being heated to high temperatures.
さらに、それらの樹脂が分解しても電気絶縁体のシ１Ｊ
力となり、電気絶縁特性を保持させるなどの特長を有し
、その工業的価値は大である。Furthermore, even if those resins decompose, the electrical insulator remains
It has great industrial value because it provides strength and maintains electrical insulation properties.
第１図は従来のシーズヒータの断面図、第２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。
５・・・・・・金属パイプ、６・・・・・・ヒータ、７
・・・・・・端子棒、８・・・・・・電気絶縁材料。FIG. 1 is a sectional view of a conventional sheathed heater, and FIG. 2 is a sectional view of a sheathed heater showing an embodiment of the present invention. 5...Metal pipe, 6...Heater, 7
...Terminal bar, 8...Electrical insulating material.
Claims (1)
間にマグネシア粉末などの電気絶縁材料を充填してなる
シーズヒータにおいて、前記充填材にシリコン樹脂のＳ
ｉ−Ｏ骨格をＳｉ−Ｏ−Ａｒ−Ｏ骨格（Ａｒはアルキレ
ン基またはアリーレン基を示す）に変換したポリアルキ
レンオキシシロキサンまたはポリアリーレンオキシシロ
キサンを混合附与させ、前記金属パイプ内に充填するこ
とを特徴とするシーズヒータ。1. In a sheathed heater in which an electrical insulating material such as magnesia powder is filled between a coiled heater equipped with a terminal bar and a metal pipe, the filling material is S of silicone resin.
Adding a mixture of polyalkyleneoxysiloxane or polyaryleneoxysiloxane in which the i-O skeleton is converted to a Si-O-Ar-O skeleton (Ar represents an alkylene group or an arylene group) and filling the mixture into the metal pipe. A sheathed heater featuring
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12155876A JPS5947872B2 (en) | 1976-10-08 | 1976-10-08 | Sea heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12155876A JPS5947872B2 (en) | 1976-10-08 | 1976-10-08 | Sea heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5345741A JPS5345741A (en) | 1978-04-24 |
| JPS5947872B2 true JPS5947872B2 (en) | 1984-11-21 |
Family
ID=14814201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12155876A Expired JPS5947872B2 (en) | 1976-10-08 | 1976-10-08 | Sea heater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5947872B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5041514A (en) * | 1989-05-18 | 1991-08-20 | General Electric Company | Polymeric reaction products of biphenols and organosilicon materials and method for making |
-
1976
- 1976-10-08 JP JP12155876A patent/JPS5947872B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5345741A (en) | 1978-04-24 |
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