JPS6148229B2 - - Google Patents
Info
- Publication number
- JPS6148229B2 JPS6148229B2 JP12817478A JP12817478A JPS6148229B2 JP S6148229 B2 JPS6148229 B2 JP S6148229B2 JP 12817478 A JP12817478 A JP 12817478A JP 12817478 A JP12817478 A JP 12817478A JP S6148229 B2 JPS6148229 B2 JP S6148229B2
- Authority
- JP
- Japan
- Prior art keywords
- embedded
- groove
- insulating material
- hot plate
- calcium carbonate
- 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 22
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 20
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 16
- 239000000395 magnesium oxide Substances 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 9
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 8
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 claims description 8
- 229910052810 boron oxide Inorganic materials 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 239000012777 electrically insulating material Substances 0.000 claims 2
- 239000011810 insulating material Substances 0.000 description 11
- 238000009413 insulation Methods 0.000 description 10
- 239000012772 electrical insulation material Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 239000000615 nonconductor Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
Landscapes
- Surface Heating Bodies (AREA)
- Resistance Heating (AREA)
Description
【発明の詳細な説明】
本発明は埋込型熱板に関し、特に、マグネシア
粉末の吸湿性を抑え、絶縁特性の良い埋込型熱板
を提供しようとするものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an embedded hot plate, and in particular, it is an object of the present invention to suppress the hygroscopicity of magnesia powder and provide an embedded hot plate with good insulation properties.
一般に、熱板としてはシーズヒータを鋳込んだ
もの、マイカータを金属板に密着させたもの、電
熱線を電気絶縁材により金属製の外殻内に埋込ん
だものの三種類があるが、寿命、熱板の温度分布
の点で第三者の埋込型熱板が他のものに比し優れ
ている。 Generally, there are three types of heating plates: those with sheathed heaters cast into them, those with micata adhered to a metal plate, and those with heating wires embedded in a metal shell with electrical insulation material. In terms of temperature distribution of the hot plate, third-party embedded type hot plates are superior to others.
ところが、この種の埋込型熱板の場合、開口面
積、すなわち、大気と接する面積が広いため、電
気絶縁材であるマグネシア粉末が吸湿しやすく、
良好な絶縁特性が得られないという欠点があつ
た。 However, in the case of this type of embedded heating plate, the opening area, that is, the area in contact with the atmosphere, is large, so the magnesia powder, which is an electrical insulating material, easily absorbs moisture.
The drawback was that good insulation properties could not be obtained.
通常のシーズヒータにマグネシア粉末を用いた
場合には、端部に吸湿防止のための封口を施せば
よいが、この種の埋込型熱板の場合、封口を施す
ことができず、封口型のシーズヒータに比し、絶
縁特性が悪いという欠点があり、実用に供し得な
いものであつた。例えば、この種の埋込型熱板を
温度40℃、相対湿度95％の恒温恒湿室に投入する
と、投入後、１〜２時間後には絶縁抵抗値が1M
Ω以下になつてしまう。 When magnesia powder is used in a normal sheathed heater, it is sufficient to seal the ends to prevent moisture absorption, but in the case of this type of embedded heating plate, sealing cannot be applied, and the sealing type Compared to the sheathed heater, it had the disadvantage of poor insulation properties and could not be put to practical use. For example, if this type of embedded heat plate is placed in a constant temperature and humidity room at a temperature of 40℃ and a relative humidity of 95%, the insulation resistance value will decrease to 1M within 1 to 2 hours.
It becomes less than Ω.
本発明は上記従来の埋込型熱板の欠点を解消す
るもので、以下に本発明の実施例について添付図
面を参照して説明する。 The present invention eliminates the drawbacks of the conventional embedded hot plate described above, and embodiments of the present invention will be described below with reference to the accompanying drawings.
図において、１は上面に開口を有する金属製の
外殻であり、内部には隔室２によりうず巻き状の
溝３が形成されている。この溝３に電気絶縁材４
によりコイル状の電熱線５が埋込まれている。こ
の電気絶縁材４としては炭酸カルシウム
（CaCO3）と酸化ホウ素（B2O3）を700〜1200℃の
温度であらかじめ熱処理したものを、一担粉砕
し、これをマグネシア粉末（MgO）に２〜30％
の割合で添加したものを用いている。６は電熱線
５の端部に接続された端子である。 In the figure, reference numeral 1 denotes a metal outer shell having an opening on the upper surface, and a spiral groove 3 is formed by a compartment 2 inside. Electrical insulating material 4 is placed in this groove 3.
A coiled heating wire 5 is embedded therein. The electrical insulating material 4 is made of calcium carbonate (CaCO 3 ) and boron oxide (B 2 O 3 ) that have been heat-treated at a temperature of 700 to 1200°C, which is then ground into two pieces of magnesia powder (MgO). ~30%
It is used that has been added at a ratio of . 6 is a terminal connected to the end of the heating wire 5.
次に上記構成の埋込型熱板の製造方法について
簡単に説明する。 Next, a method for manufacturing the embedded hot plate having the above structure will be briefly described.
まず、外殻１の溝３内に上記電気絶縁板４を注
入する。この場合、外殻１に振動加速度５〜20G
程度の振動を加え、電気絶縁材４の表面の高さ、
および密度を均一にするとよい。この後、第２図
に示すように溝付型７を備えたプレス機により、
第３図に示すように上記電気絶縁材４に電熱線５
が挿入される溝８を形成する。この溝８に電熱線
５を挿入し（第４図）、さらに上記電気絶縁材４
を溝３に注入し、第５図に示すように電熱線５を
覆う。この後、平型９を備えたプレス機によりプ
レスし、電気絶縁材４の充填密度を高める（第６
図）。この後、900〜1150℃の温度で５〜120分間
熱処理を施すことにより埋込型熱板が完成され
る。 First, the electrically insulating plate 4 is injected into the groove 3 of the outer shell 1. In this case, the vibration acceleration for outer shell 1 is 5 to 20G.
By applying a certain degree of vibration, the height of the surface of the electrical insulating material 4,
It is good to make the density uniform. After this, as shown in FIG. 2, a press machine equipped with a grooved mold 7 is used to
As shown in FIG. 3, a heating wire 5 is attached to the electrical insulating material 4.
A groove 8 is formed into which the material is inserted. Insert the heating wire 5 into this groove 8 (Fig. 4), and then insert the electric insulating material 4
is injected into the groove 3 to cover the heating wire 5 as shown in FIG. After that, it is pressed using a press machine equipped with a flat die 9 to increase the packing density of the electrical insulating material 4 (sixth
figure). Thereafter, heat treatment is performed at a temperature of 900 to 1150°C for 5 to 120 minutes to complete the embedded hot plate.
この最終熱処理時に炭酸カルシウム、酸化ホウ
素が溶融硬化するので熱処理後には電気絶縁材４
がこぼれ落ちることがなく、また、衝撃が加わつ
ても脱落することがなく、従つて、裏板等を設け
て封口を施すことが不要である。 During this final heat treatment, calcium carbonate and boron oxide are melted and hardened, so the electrical insulation material 4
It does not spill out, and it does not fall off even if an impact is applied, so there is no need to provide a back plate or the like to seal the opening.
なお、電気絶縁材４に電熱線５が挿入される溝
８を鮮明に形成するために、プレス圧、溝８の形
状を変えたり、電気絶縁材４に少量の有機溶剤等
を添加したりすると良い。 In addition, in order to clearly form the groove 8 into which the heating wire 5 is inserted in the electrical insulating material 4, the pressing pressure and the shape of the groove 8 may be changed, or a small amount of organic solvent or the like may be added to the electrical insulating material 4. good.
また、電熱線５は溝８に挿入する以前にあらか
じめ、溝８の長さに伸ばしておき、第７図に示す
ように耐熱性の磁器等で形成された成型器１０に
溝８と同様にうず巻き状で幅の狭い溝１１を形成
し、この溝１１に上記電熱線５を挿入し、電流を
流した後、冷却することにより、第８図に示すよ
うに電熱線５を溝８に沿つたうず巻き状としてお
くと良い。 The heating wire 5 is stretched to the length of the groove 8 before being inserted into the groove 8, and as shown in FIG. By forming a narrow spiral groove 11, inserting the heating wire 5 into the groove 11, passing a current through it, and cooling it, the heating wire 5 is guided along the groove 8 as shown in FIG. It is best to make it into a spiral shape.
本実施例の埋込型熱板を温度40℃、相対湿度95
％の恒温恒湿雰囲気中に７日間投入後の絶縁抵抗
値は100〜2000MΩ以上でありきわめて高い絶縁
特性を示した。 The embedded heat plate of this example was installed at a temperature of 40°C and a relative humidity of 95°C.
After being placed in a constant temperature and humidity atmosphere for 7 days, the insulation resistance value was 100 to 2000 MΩ or more, indicating extremely high insulation properties.
なお、炭酸カルシウムや酸化ホウ素を電気絶縁
材として用いたシーズヒータでは上記と同様の条
件で絶縁抵抗値を測定すると１〜20MΩであり、
本実施例の熱板の方が優れた絶縁特性を示すこと
が明らかとなつた。 In addition, in a sheathed heater that uses calcium carbonate or boron oxide as an electrical insulator, the insulation resistance value is 1 to 20 MΩ when measured under the same conditions as above.
It became clear that the hot plate of this example exhibited superior insulation properties.
また、この種の埋込型熱板においてメチール系
シリコン樹脂を添加した電気絶縁材を用いた場
合、連続使用では表面温度250〜350℃までが限界
であり、一般に表面温度450〜550℃を要求される
熱板としては実用に供し得ないものであつた。 In addition, when using electrical insulation material containing methyl silicone resin in this type of embedded heating plate, the surface temperature is limited to 250 to 350°C for continuous use, and generally a surface temperature of 450 to 550°C is required. However, it could not be put to practical use as a hot plate.
しかし、本実施例の場合、表面温度600〜700℃
までで長時間使用が可能であり、熱板として充分
に実用に供し得るものである。 However, in the case of this example, the surface temperature was 600 to 700℃.
It can be used for a long time, and can be put to practical use as a hot plate.
なお、電気絶縁材４に関し、マグネシア粉末に
対する炭酸カルシウムおよび酸化ホウ素の割合が
２％以下であると、熱処理を施してもマグネシア
粉末に炭酸カルシウムや酸化ホウ素が完全に覆わ
ず、保護皮膜として充分に作用しない。 Regarding the electrical insulating material 4, if the ratio of calcium carbonate and boron oxide to the magnesia powder is 2% or less, the magnesia powder will not be completely covered with calcium carbonate and boron oxide even after heat treatment, and will not be sufficient as a protective film. Doesn't work.
また、同割合が30％以上であると、絶縁特性が
劣化するとともに充填密度があまり高くならな
い。 Furthermore, if the ratio is 30% or more, the insulation properties deteriorate and the packing density does not become very high.
以上の説明から明らかなように、本発明によれ
ば、電気絶縁材としてマグネシア粉末に炭酸カル
シウム、酸化ホウ素を添加したものを用いている
ので絶縁特性が良く、表面温度600〜700℃まで長
時間使用が可能で、熱板として充分に実用に供し
得、その工業的価値は大なるものである。 As is clear from the above explanation, according to the present invention, magnesia powder with calcium carbonate and boron oxide added is used as an electrical insulating material, so it has good insulation properties and can maintain a surface temperature of 600 to 700°C for a long time. It can be used practically as a hot plate, and its industrial value is great.
第１図は本発明の一実施例を示す埋込型熱板の
断面図、第２〜６図は同埋込型熱板の製造工程を
示す要部工程断面図、第７図は同製造工程に用い
られる成型器の断面図、第８図は同成型器により
成型された電熱線の斜視図である。
１……外殻、３……溝、４……電気絶縁材、５
……電熱線。
Fig. 1 is a sectional view of an embedded hot plate showing an embodiment of the present invention, Figs. 2 to 6 are sectional views of main parts showing the manufacturing process of the embedded hot plate, and Fig. 7 is a sectional view of the same manufacturing process. FIG. 8 is a sectional view of a molding device used in the process, and a perspective view of a heating wire molded by the same molding device. 1... Outer shell, 3... Groove, 4... Electrical insulation material, 5
...Heating wire.
Claims (1)
し、この溝に電熱線を電気絶縁材により埋めてな
る埋込型熱板において、前記電気絶縁材はマグネ
シア粉末に炭酸カルシウムおよび酸化ホウ素を添
加し、熱処理を施したものであることを特徴とす
る埋込型熱板。 ２ マグネシア粉末に対する炭酸カルシウムおよ
び酸化ホウ素の割合が２〜30％であることを特徴
とする特許請求の範囲第１項に記載の埋込型熱
板。[Claims] 1. An embedded heating plate in which a groove having an opening on one side is formed in a metal outer shell, and heating wires are buried in the groove with an electrically insulating material, wherein the electrically insulating material is magnesia powder. An embedded hot plate characterized in that it is made by adding calcium carbonate and boron oxide to it and subjecting it to heat treatment. 2. The embedded hot plate according to claim 1, wherein the proportion of calcium carbonate and boron oxide to magnesia powder is 2 to 30%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12817478A JPS5553888A (en) | 1978-10-17 | 1978-10-17 | Push type heating plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12817478A JPS5553888A (en) | 1978-10-17 | 1978-10-17 | Push type heating plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5553888A JPS5553888A (en) | 1980-04-19 |
| JPS6148229B2 true JPS6148229B2 (en) | 1986-10-23 |
Family
ID=14978231
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12817478A Granted JPS5553888A (en) | 1978-10-17 | 1978-10-17 | Push type heating plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5553888A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57204685U (en) * | 1981-06-24 | 1982-12-27 | ||
| JPS60236485A (en) * | 1985-04-16 | 1985-11-25 | 松下電器産業株式会社 | Buried heater |
| JPS6231986A (en) * | 1985-08-02 | 1987-02-10 | 松下電器産業株式会社 | Buried heater |
-
1978
- 1978-10-17 JP JP12817478A patent/JPS5553888A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5553888A (en) | 1980-04-19 |
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