JPH118048A - Electrical insulating material for sheath heater - Google Patents
Electrical insulating material for sheath heaterInfo
- Publication number
- JPH118048A JPH118048A JP15847697A JP15847697A JPH118048A JP H118048 A JPH118048 A JP H118048A JP 15847697 A JP15847697 A JP 15847697A JP 15847697 A JP15847697 A JP 15847697A JP H118048 A JPH118048 A JP H118048A
- Authority
- JP
- Japan
- Prior art keywords
- metal pipe
- insulating material
- electrical insulating
- aluminum
- heater wire
- 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.)
- Pending
Links
- 239000011810 insulating material Substances 0.000 title claims abstract description 13
- 229910052751 metal Inorganic materials 0.000 claims abstract description 22
- 239000002184 metal Substances 0.000 claims abstract description 22
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 8
- 239000010452 phosphate Substances 0.000 claims abstract description 8
- 125000002467 phosphate group Chemical group [H]OP(=O)(O[H])O[*] 0.000 claims abstract description 8
- 238000010521 absorption reaction Methods 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 230000006835 compression Effects 0.000 abstract description 3
- 238000007906 compression Methods 0.000 abstract description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 abstract description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 abstract description 2
- 229910052802 copper Inorganic materials 0.000 abstract description 2
- 239000010949 copper Substances 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 abstract description 2
- 229910052742 iron Inorganic materials 0.000 abstract description 2
- 239000003960 organic solvent Substances 0.000 abstract description 2
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 2
- 239000010935 stainless steel Substances 0.000 abstract description 2
- 229910052719 titanium Inorganic materials 0.000 abstract description 2
- 239000010936 titanium Substances 0.000 abstract description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 16
- 238000009413 insulation Methods 0.000 description 14
- 239000000395 magnesium oxide Substances 0.000 description 8
- 239000000843 powder Substances 0.000 description 8
- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical group O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 229920002050 silicone resin Polymers 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000012777 electrically insulating material Substances 0.000 description 3
- QPLNUHHRGZVCLQ-UHFFFAOYSA-K aluminum;[oxido(phosphonooxy)phosphoryl] phosphate Chemical class [Al+3].OP([O-])(=O)OP([O-])(=O)OP(O)([O-])=O QPLNUHHRGZVCLQ-UHFFFAOYSA-K 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 229920002379 silicone rubber Polymers 0.000 description 2
- 239000004135 Bone phosphate Substances 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
Landscapes
- Resistance Heating (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はシーズヒータ用電気
絶縁材料に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric insulating material for a sheathed heater.
【０００２】[0002]
【従来の技術】シーズヒータは、安全性が高く、耐食性
に優れているため、ホットプレート、オーブン電子レン
ジなどの調理機器、または暖房機器などの加熱源として
広く使用されている。このシーズヒータは、金属パイプ
の内部中央にターミナルを接合したコイル状ヒータ線を
挿入し、金属パイプとコイル状ヒータ線との間に電気絶
縁材料を充填して圧縮減径、熱処理等を得て金属パイプ
端末を封口している。従来、この電気絶縁材料として優
れたマグネシア粉末が最も多く用いられている。2. Description of the Related Art Seeds heaters are widely used as heating sources for cooking appliances such as hot plates and oven microwave ovens, or heating appliances because of their high safety and excellent corrosion resistance. This sheathed heater inserts a coil-shaped heater wire with a terminal joined to the center of the inside of a metal pipe, fills an electrical insulating material between the metal pipe and the coil-shaped heater wire, and obtains compression reduction, heat treatment, etc. The metal pipe ends are sealed. Heretofore, excellent magnesia powder has been most often used as this electric insulating material.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、マグネ
シア粉末は吸湿性があるため、湿度の高い雰囲気に長時
間暴露すると容易に吸湿し、金属パイプとヒータ線との
間の絶縁抵抗が低下してしまう欠点がある。However, since magnesia powder has hygroscopicity, it is easily absorbed when exposed to a humid atmosphere for a long time, and the insulation resistance between the metal pipe and the heater wire is reduced. There are drawbacks.
【０００４】そこでシリコーン樹脂により、マグネシア
粉末の表面を被膜処理し、吸湿を防止する方法が行われ
ている。しかし、この方法はシリコーン樹脂を均一に被
膜させることが困難であること、また被膜処理工程にお
いて、マグネシア粉末およびシリコーン樹脂がブロック
状になるため粉砕をする必要がある。Therefore, a method of coating the surface of magnesia powder with a silicone resin to prevent moisture absorption has been used. However, in this method, it is difficult to uniformly coat the silicone resin, and it is necessary to pulverize the magnesia powder and the silicone resin in the coating treatment step because the magnesia powder and the silicone resin become block-like.
【０００５】従ってシリコーン樹脂で被膜されない或い
は被膜が不充分な部分が出来、吸湿を完全に防止するこ
とが出来ない。[0005] Therefore, a portion which is not coated with the silicone resin or has an insufficient coating is formed, and it is impossible to completely prevent moisture absorption.
【０００６】また、マグネシア粉末が吸湿しないよう
に、金属パイプの端末部をシリコンゴムや低融点ガラス
で封止することが行われている。この方法では、ヒータ
線に接合されているターミナルが曲がったりすると、シ
リコーンゴムまたは低融点ガラスからなる封口体にクラ
ックが発生して封止効果がなくなりシーズヒータの絶縁
抵抗が低下するという欠点がある。[0006] In order to prevent the magnesia powder from absorbing moisture, the end of the metal pipe is sealed with silicon rubber or low melting point glass. In this method, if the terminal joined to the heater wire is bent, cracks occur in the sealing body made of silicone rubber or low-melting glass, so that the sealing effect is lost and the insulation resistance of the sheathed heater is reduced. .
【０００７】[0007]
【問題を解決するための手段】本発明者らは、従来のマ
グネシア粉末のこのような問題点を解決するため鋭意検
討を重ねた結果、電気絶縁材料として第三燐酸アルミニ
ウムを用いることにより、吸湿による絶縁抵抗の低下を
防止出来ることを見いだし、本発明を完成するに至っ
た。Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve such problems of the conventional magnesia powder. As a result, the use of tertiary aluminum phosphate as an electrical insulating material has led to a decrease in moisture absorption. It has been found that the insulation resistance can be prevented from lowering, and the present invention has been completed.
【０００８】すなわち、本発明は金属パイプ内にヒータ
線を電気絶縁材料を用い埋没するシーズヒータにおい
て、該電気絶縁材料が第三燐酸アルミニウムであること
を特徴とするシーズヒータ用電気絶縁材料に関する。That is, the present invention relates to a sheathed heater in which a heater wire is buried in a metal pipe using an electrically insulating material, wherein the electrically insulating material is tertiary aluminum phosphate.
【０００９】[0009]
【発明の実施の形態】以下、本発明を詳細に説明する。
本発明の金属パイプは鉄、ステンレス鋼、アルミニウ
ム、チタン、銅等が用いられる。また、その用途に応じ
てさまざまな径のパイプが用いられる。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
For the metal pipe of the present invention, iron, stainless steel, aluminum, titanium, copper and the like are used. Also, pipes of various diameters are used depending on the application.
【００１０】本発明では、この金属パイプの内部中央に
ターミナルを接合したコイル状ヒータ線を挿入し、金属
パイプとコイル状ヒータ線との間に電気絶縁材料を充填
して圧縮減径、熱処理等を得て金属パイプ端末を封口し
て用いる。In the present invention, a coiled heater wire having a terminal joined to the center of the inside of the metal pipe is inserted, and an electric insulating material is filled between the metal pipe and the coiled heater wire to reduce the compression diameter, heat treatment, etc. And the metal pipe end is sealed and used.
【００１１】この金属パイプとコイル状ヒータ線との間
に電気絶縁材料として、第三燐酸アルミニウムを用い
る。該第三燐酸アルミニウムは一般に市販されているも
のを用いることができる。また、特開昭６０−２３５７
９７号公報に記載の有機溶媒の存在下で、燐酸とアルミ
ニウムの水酸化物または酸化物を反応させて得られる第
三燐酸アルミニウムを用いることにより、なお一層の電
気絶縁効果が発揮できるが、特に限定するものではな
い。As a material for electrically insulating between the metal pipe and the coiled heater wire, aluminum tertiary phosphate is used. The commercially available aluminum tertiary phosphate can be generally used. Also, Japanese Patent Application Laid-Open No. Sho 60-2357
No. 97, the use of tertiary aluminum phosphate obtained by reacting a phosphoric acid and a hydroxide or oxide of aluminum in the presence of an organic solvent can further exert an electrical insulating effect. It is not limited.
【００１２】この第三燐酸アルミニウム自体は、吸湿性
がなく絶縁抵抗値が２×１０６Ω以上であるため、本発
明を達成出来るものである。This aluminum triphosphate itself has no hygroscopicity and has an insulation resistance value of 2 × 10 6 Ω or more, so that the present invention can be achieved.
【００１３】[0013]
【実施例】本発明を実施例に基づきさらに詳細に説明す
る。 実施例１ 電気絶縁材料として市販の第三燐酸アルミニウムを、金
属パイプとコイル状ヒータ線との間に、振動させながら
充填した。その後、金属パイプの減径を行い長さ６０ｃ
ｍのシーズヒータを１０本作成した。その内の５本は、
直ちに絶縁抵抗を測定した。測定方法は、ヒータ線に通
電して発熱させ、金属パイプの表面温度が８００℃に達
したときの金属パイプとヒータ線との間の絶縁抵抗を測
定した。残りの５本は、高湿度雰囲気に暴露されたとき
の絶縁抵抗を調べるために、温度４０℃、相対湿度９０
％の恒温恒湿槽中に入れ、７日間放置した。この７日間
放置したシーズヒータの絶縁抵抗を上述と同法にて測定
した。絶縁抵抗測定結果は、５本の平均値として、表１
に示す。第三燐酸アルミニウムを充填したシーズヒータ
は、高湿度雰囲気下に放置しても、絶縁抵抗値の低下は
見られなかった。EXAMPLES The present invention will be described in more detail with reference to examples. Example 1 A commercially available aluminum triphosphate as an electrical insulating material was filled between a metal pipe and a coiled heater wire while vibrating. After that, reduce the diameter of the metal pipe to a length of 60c.
m seed heaters were prepared. Five of them are
The insulation resistance was measured immediately. As a measuring method, the heater wire was energized to generate heat, and the insulation resistance between the metal pipe and the heater wire when the surface temperature of the metal pipe reached 800 ° C. was measured. The remaining five tubes were tested at a temperature of 40 ° C. and a relative humidity of 90 to examine the insulation resistance when exposed to a high humidity atmosphere.
% In a constant temperature / humidity chamber and left for 7 days. The insulation resistance of the sheathed heater left for 7 days was measured by the same method as described above. The insulation resistance measurement results are shown in Table 1 as the average value of five wires.
Shown in The sheathed heater filled with aluminum tertiary phosphate did not show any decrease in insulation resistance even when left in a high humidity atmosphere.
【００１４】比較例１ 実施例１の第三燐酸アルミニウムをマグネシア粉末に変
更した以外は、実施例１と同様に行った。絶縁抵抗測定
結果を表１に示す。Comparative Example 1 The procedure of Example 1 was repeated, except that the tertiary aluminum phosphate was changed to magnesia powder. Table 1 shows the measurement results of the insulation resistance.
【００１５】[0015]
【表１】 [Table 1]
【００１６】[0016]
【発明の効果】本発明は第三燐酸アルミニウムの吸湿性
がなく、絶縁抵抗値が大きいという特性を生かし、シー
ズヒータの電気絶縁材料としてその性能を発揮するもの
である。したがって、電気絶縁材料として第三燐酸アル
ミニウムを用いることにより、吸湿による絶縁抵抗の低
下を防止できる効果がある。即ち、本発明の比較例では
高温、高湿度下に長期間放置することにより、絶縁抵抗
の低下を招くが、本発明の実施例では、それらがまった
くない。The present invention makes use of the properties of tribasic aluminum phosphate, which has no hygroscopicity and a large insulation resistance value, to exhibit its performance as an electrically insulating material for a sheathed heater. Therefore, the use of tertiary aluminum phosphate as an electrical insulating material has the effect of preventing a decrease in insulation resistance due to moisture absorption. That is, in the comparative example of the present invention, the insulation resistance is lowered by leaving the device under a high temperature and a high humidity for a long period of time.
Claims (1)
料を用い埋没するシーズヒータにおいて、該電気絶縁材
料が第三燐酸アルミニウムであることを特徴とするシー
ズヒータ用電気絶縁材料。1. A sheath heater in which a heater wire is buried in a metal pipe using an electrical insulating material, wherein the electrical insulating material is aluminum tertiary phosphate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15847697A JPH118048A (en) | 1997-06-16 | 1997-06-16 | Electrical insulating material for sheath heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15847697A JPH118048A (en) | 1997-06-16 | 1997-06-16 | Electrical insulating material for sheath heater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH118048A true JPH118048A (en) | 1999-01-12 |
Family
ID=15672582
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15847697A Pending JPH118048A (en) | 1997-06-16 | 1997-06-16 | Electrical insulating material for sheath heater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH118048A (en) |
-
1997
- 1997-06-16 JP JP15847697A patent/JPH118048A/en active Pending
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