JPS6318313B2 - - Google Patents

Info

Publication number
JPS6318313B2
JPS6318313B2 JP10561884A JP10561884A JPS6318313B2 JP S6318313 B2 JPS6318313 B2 JP S6318313B2 JP 10561884 A JP10561884 A JP 10561884A JP 10561884 A JP10561884 A JP 10561884A JP S6318313 B2 JPS6318313 B2 JP S6318313B2
Authority
JP
Japan
Prior art keywords
electrode
heating resistor
ceramic heater
ceramic
resistor pattern
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
Application number
JP10561884A
Other languages
Japanese (ja)
Other versions
JPS60249284A (en
Inventor
Masakatsu Yamauchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TANIKA DENKI KK
Original Assignee
TANIKA DENKI KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by TANIKA DENKI KK filed Critical TANIKA DENKI KK
Priority to JP10561884A priority Critical patent/JPS60249284A/en
Publication of JPS60249284A publication Critical patent/JPS60249284A/en
Publication of JPS6318313B2 publication Critical patent/JPS6318313B2/ja
Granted legal-status Critical Current

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Description

【発明の詳細な説明】 本発明は液体の入つた容器の底に組付けられる
電熱ヒーターにセラミツク製ヒーターを用いたも
のに関する。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric heater that is assembled to the bottom of a container containing a liquid and uses a ceramic heater.

従来からセラミツク基板に発熱抵抗体を埋設し
た平板状あるいは管状のセラミツクヒーターは各
種公知である。しかし、この種セラミツクヒータ
ーは化学的安定性並びに小形状高出力等の利点が
あるに反し、急熱急冷すなわち液体を入れなで空
通電した時の急熱やこの種空焼通電直後の冷水の
注水による急冷等急激な温度変化による歪に極め
て脆く、ために発生する膨張・収縮によつてそこ
にクラツク、割れ等がしばしば発生する。このた
め被加熱液体内への発熱部露出を懸念してこの発
熱部を容器の裏面底に組付けた構造のものが一般
的である。しかしこれらの構造では容器底の壁面
を挟んで被加熱液体を加熱するため熱効率が悪
く、またこのセラミツクヒーターと容器底との密
着性を良くするため平坦な面を形成せしめねばな
らないことや、取付けるセラミツクヒーター全面
を隙間なく機械的に押圧することが必要である。
しかしセラミツクヒーター面を直接押圧すること
は割れ等の発生要因となり危険でそのため間接的
に全面均等に押圧することが必要となり、この押
圧構造が複雑で信頼性が低い。このためセラミツ
クヒーターを被加熱液体内へ取付け、割れ、クラ
ツク等で発熱部が露出した時に発生するリーク電
流を検知する検知電極並びにその検知回路をセラ
ミツクヒーターとは離れて別個に設けた構造のも
のもあるが、この種構造においては容器に検知用
電極を取付ける穴を必要とし、且つその取付けを
水密構造とする必要が生ずる。またセラミツクヒ
ーターとは別個に検知用電極が取付けてあるため
リーク電流の検知に遅れが生じ速やかなリーク電
流の検知並びに割れの検出が出来ないという欠点
がある。
2. Description of the Related Art Various flat or tubular ceramic heaters in which a heating resistor is embedded in a ceramic substrate are known. However, although this type of ceramic heater has advantages such as chemical stability and small size and high output, it does not cause rapid heating or cooling, that is, rapid heating when a liquid is added and dry energization is applied, and cold water immediately after dry energization. It is extremely susceptible to distortion due to rapid temperature changes such as rapid cooling due to water injection, and the resulting expansion and contraction often causes cracks and cracks. For this reason, due to concerns about exposure of the heat generating part into the liquid to be heated, a structure in which the heat generating part is assembled to the back bottom of the container is common. However, these structures have poor thermal efficiency because the liquid to be heated is heated between the walls of the bottom of the container, and in order to improve the adhesion between the ceramic heater and the bottom of the container, a flat surface must be formed, and it is difficult to install the ceramic heater. It is necessary to mechanically press the entire surface of the ceramic heater without any gaps.
However, directly pressing the ceramic heater surface is dangerous as it may cause cracks, etc. Therefore, it is necessary to press indirectly and evenly over the entire surface, and this pressing structure is complicated and unreliable. For this reason, a ceramic heater is installed in the liquid to be heated, and a detection electrode and its detection circuit that detect the leakage current that occurs when the heat generating part is exposed due to cracks, etc. are installed separately from the ceramic heater. However, this type of structure requires a hole in the container for mounting the detection electrode, and also requires a watertight structure for mounting. Further, since the detection electrode is attached separately from the ceramic heater, there is a delay in detecting leakage current, and there is a drawback that prompt detection of leakage current and cracks cannot be performed.

本発明は上記の欠点を解消するためになされた
もので以下図面を用いて本発明の実施例を具体的
に説明する。1はアルミナ、ジルコニア等の無機
質粉末を原料とし、これをセラミツクグリーンシ
ート状に成形した第1セラミツク基板で、この第
1セラミツク基板1の表面には波形あるいはノコ
刃形の配線摸様となるよう発熱抵抗体パターン2
が成形される。そしてまたこの発熱抵抗体パター
ン2は同時に発熱抵抗体端子3,3並びに第3電
極端子4をタングステン、モリブデン−マンガン
等の導電ペーストを用いて印刷して形成する。5
は、第1セラミツク基板1同様アルミナ、ジルコ
ニア等の無機質粉末を原料とし、これを薄いセラ
ミツクグリーンシート状に成形したセラミツク基
板からなる薄層で、この薄層5の中央にはこれを
貫通するようにスルーホール6が設けてある。次
にこの薄層5の上面ほぼ中央に防蝕導電材料例え
ばタングステン、銀材等の導電ペーストを塗布あ
るいは印刷等で厚膜に仕上げて第3電極7を形成
せしめる。次にこの第3電極7が印刷された薄層
5と発熱抵抗体パターン2が印刷された第1セラ
ミツク基板1は薄層5の下面と第1セラミツク基
板1で発熱抵抗体パターン2を挾着するよう積層
されるしかもこの時薄層5に設けたスルーホール
6は第1セラミツク基板1の表面に発熱抵抗体パ
ターン2をさけて設けてある第3電極端子4に当
接できる。次にスルーホール6に第3電極7同様
防蝕導電材料例えば前記タングステンや銀材等の
導電ペーストを充填し第3電極7と第3電極端子
4との間を電気的に結合し得られるものを焼結一
体化する。次に焼結一体化されたものの前記発熱
抵抗体端子3,3並びに第3電極端子4に銀ロウ
等を用いてニツケル線よりなる一対の発熱抵抗体
リード線8,8及び第3電極リード線9をそれぞ
れ接続して完成する。
The present invention has been made to solve the above-mentioned drawbacks, and embodiments of the present invention will be specifically described below with reference to the drawings. Reference numeral 1 denotes a first ceramic substrate made of inorganic powder such as alumina or zirconia, which is formed into a ceramic green sheet.The surface of the first ceramic substrate 1 has a corrugated or saw-shaped wiring pattern. Heating resistor pattern 2
is formed. The heating resistor pattern 2 is also formed by simultaneously printing the heating resistor terminals 3, 3 and the third electrode terminal 4 using a conductive paste such as tungsten or molybdenum-manganese. 5
Like the first ceramic substrate 1, this is a thin layer made of a ceramic substrate made from inorganic powder such as alumina or zirconia and formed into a thin ceramic green sheet. A through hole 6 is provided in the hole. Next, a third electrode 7 is formed by coating or printing a conductive paste of a corrosion-resistant conductive material, such as tungsten or silver, approximately at the center of the upper surface of the thin layer 5. Next, the thin layer 5 on which the third electrode 7 is printed and the first ceramic substrate 1 on which the heat generating resistor pattern 2 is printed are held together, and the heat generating resistor pattern 2 is clamped between the lower surface of the thin layer 5 and the first ceramic substrate 1. At this time, the through holes 6 provided in the thin layer 5 can come into contact with the third electrode terminals 4 provided on the surface of the first ceramic substrate 1 while avoiding the heating resistor pattern 2. Next, the through hole 6 is filled with a corrosion-resistant conductive material similar to the third electrode 7, such as a conductive paste such as the above-mentioned tungsten or silver material to electrically connect the third electrode 7 and the third electrode terminal 4. Sintered and integrated. Next, a pair of heating resistor lead wires 8, 8 and a third electrode lead wire made of nickel wire are formed by using silver solder or the like on the heating resistor terminals 3, 3 and the third electrode terminal 4 of the sintered and integrated product. Connect each 9 to complete.

以上のように構成された本発明のセラミツクヒ
ーターを容器の底に組付けられた時、接続は発熱
抵抗体パターン2の両端にリレースイツチ10を
介して電源100Vが接続され、また第3電極7と
電源の一方とはリレースイツチ10の駆動コイル
を介して接続されている。ここで液体を入れ電源
100Vを発熱抵抗体パターン2に通電すると第3
電極7と電源の一方とは導通がなくリレースイツ
チ10の駆動コイルは動作しない、よつて発熱抵
抗体パターン2は発熱を開始する。次に空焼また
は空焼直後の注水などでセラミツクヒーターに割
れ、クラツクが発生し発熱部が液体中に露出した
時は第3電極7と電源の一方との間に前記液体を
介して電流が流れリレースイツチ10の駆動コイ
ルが作動し、リレースイツチ10をOFFし発熱
抵抗体パターン2への通電は断電され電気的リー
クは速やかに防止される。
When the ceramic heater of the present invention constructed as described above is assembled to the bottom of a container, a power supply of 100 V is connected to both ends of the heating resistor pattern 2 via the relay switch 10, and the third electrode 7 and one of the power sources are connected via the drive coil of the relay switch 10. Pour the liquid here and turn on the power.
When 100V is applied to heating resistor pattern 2, the 3rd
There is no conduction between the electrode 7 and one of the power sources, and the drive coil of the relay switch 10 does not operate, so the heating resistor pattern 2 starts generating heat. Next, when the ceramic heater cracks due to dry firing or water injection immediately after dry firing, a crack occurs and the heat generating part is exposed in the liquid, a current flows between the third electrode 7 and one of the power sources through the liquid. The drive coil of the flow relay switch 10 is actuated, turning off the relay switch 10, cutting off the current to the heating resistor pattern 2, and preventing electrical leakage immediately.

本発明は以上のように構成され作動するので以
下に説明するようにすぐれた効果がある。
Since the present invention is constructed and operated as described above, it has excellent effects as explained below.

すなわち本発明のセラミツクヒーターは検知電
極である第3電極が発熱抵抗体パターンと薄層を
介して極めて近接した位置に設けられ焼結一体化
してあるので、前述した従来構造にいうセラミツ
クヒーターとは別個に離れた位置に検知電極が取
付けてあるため発生する電気的リークの検知の遅
れによる完全な電気的リークの防止ができないと
いう欠点は排除され速やかに検知並びに電気的リ
ークが防止され従つて極めて信頼性が高く充電部
露出による感電等の恐れがなくなり安全な液体加
温ができる。また本発明による第3電極はセラミ
ツクヒーターの上面に厚膜状に成形焼結一体化さ
れているので外部応力例えば内部洗浄時等の応力
による損傷がなく強固で長寿命となる。また焼結
一体化されているので単一部品化できこれを用い
た組立作業が容易で且つ量産性に優れている。ま
た本発明においては第3電極の防蝕導電材料とし
て白金、ロジウム等の材料を使用すれば薬品等化
学性液体を加温する場合も、これら被加熱液体に
対し防蝕その他の特性を発揮し極めて化学的に安
定した長寿命な第3電極を得ることが出来る等特
有の効果がある。
That is, in the ceramic heater of the present invention, the third electrode, which is the sensing electrode, is provided in a position extremely close to the heating resistor pattern via a thin layer and is sintered into one piece, so it is different from the ceramic heater in the conventional structure described above. The disadvantage of not being able to completely prevent electrical leaks due to the delay in detecting electrical leaks that occurs due to the detection electrodes being installed at separate and distant positions is eliminated, and the detection and electrical leaks can be detected quickly and electrical leaks can be prevented. It is highly reliable and eliminates the risk of electric shock due to exposed live parts, allowing safe liquid heating. Further, since the third electrode according to the present invention is integrally molded and sintered into a thick film on the top surface of the ceramic heater, it is strong and has a long life without being damaged by external stress, such as stress during internal cleaning. In addition, since it is sintered and integrated, it can be made into a single component, which makes assembly work easy and has excellent mass productivity. In addition, in the present invention, if a material such as platinum or rhodium is used as the corrosion-resistant conductive material of the third electrode, even when heating chemical liquids such as drugs, it will exhibit corrosion-proofing and other properties for these heated liquids, and will be extremely chemically This method has unique effects such as being able to obtain a third electrode that is physically stable and has a long life.

【図面の簡単な説明】[Brief explanation of the drawing]

図面は本発明の実施例を示すもので、第1図は
本発明の構造を有するセラミツクヒーターの斜視
図、第2図は第1図のA−A断面図、第3図は同
セラミツクヒーターの作動説明回路図である。 1……第1セラミツク基板、2……発熱抵抗体
パターン、5……薄層、7……第3電極。
The drawings show embodiments of the present invention; FIG. 1 is a perspective view of a ceramic heater having the structure of the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG. It is a circuit diagram explaining operation. DESCRIPTION OF SYMBOLS 1...First ceramic substrate, 2...Heating resistor pattern, 5...Thin layer, 7...Third electrode.

Claims (1)

【特許請求の範囲】 1 セラミツク基板の表面にタングステン材等よ
りなる定形状の発熱抵抗体パターンを埋設し且
つ、該セラミツク基板の発熱抵抗体パターンの上
面に薄層を介して防蝕導電材からなる導電ペース
トをプリント焼結して作る第3電極を併せ具えた
構造の液体加熱用セラミツクヒーター。 2 前記第3電極の材料が白金、ロジウム等から
なる特許請求の範囲第1項記載のセラミツクヒー
ター。
[Scope of Claims] 1. A heating resistor pattern of a regular shape made of tungsten material or the like is embedded in the surface of a ceramic substrate, and a corrosion-resistant conductive material made of a corrosion-resistant conductive material is interposed on the upper surface of the heating resistor pattern of the ceramic substrate. A ceramic heater for heating liquids that also includes a third electrode made by printing and sintering conductive paste. 2. The ceramic heater according to claim 1, wherein the third electrode is made of platinum, rhodium, or the like.
JP10561884A 1984-05-24 1984-05-24 Ceramic heater Granted JPS60249284A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10561884A JPS60249284A (en) 1984-05-24 1984-05-24 Ceramic heater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10561884A JPS60249284A (en) 1984-05-24 1984-05-24 Ceramic heater

Publications (2)

Publication Number Publication Date
JPS60249284A JPS60249284A (en) 1985-12-09
JPS6318313B2 true JPS6318313B2 (en) 1988-04-18

Family

ID=14412479

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10561884A Granted JPS60249284A (en) 1984-05-24 1984-05-24 Ceramic heater

Country Status (1)

Country Link
JP (1) JPS60249284A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62208588A (en) * 1986-03-07 1987-09-12 松下電器産業株式会社 Panel heater

Also Published As

Publication number Publication date
JPS60249284A (en) 1985-12-09

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