JPH05123246A - Electric liquid heater - Google Patents

Electric liquid heater

Info

Publication number
JPH05123246A
JPH05123246A JP28768691A JP28768691A JPH05123246A JP H05123246 A JPH05123246 A JP H05123246A JP 28768691 A JP28768691 A JP 28768691A JP 28768691 A JP28768691 A JP 28768691A JP H05123246 A JPH05123246 A JP H05123246A
Authority
JP
Japan
Prior art keywords
layer
coating layer
fluororesin coating
boiling agent
container
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.)
Granted
Application number
JP28768691A
Other languages
Japanese (ja)
Other versions
JP3221017B2 (en
Inventor
Kozo Asano
興三 浅野
Toshio Mizuno
敏夫 水野
Masaaki Nishinaga
昌昭 西長
Nobuyoshi Wada
信義 和田
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.)
Daikin Industries Ltd
Original Assignee
Daikin Industries Ltd
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 Daikin Industries Ltd filed Critical Daikin Industries Ltd
Priority to JP28768691A priority Critical patent/JP3221017B2/en
Publication of JPH05123246A publication Critical patent/JPH05123246A/en
Application granted granted Critical
Publication of JP3221017B2 publication Critical patent/JP3221017B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PURPOSE:To stably and rapidly heat liquid and to improve contamination resistance by providing a bumping preventive layer consisting of a fluororesin coating layer as an underlayer and a boiling agent layer as an upper layer on the inside surface of a container corresponding to the heat generating source and temp. sensing part in the bottom of the container. CONSTITUTION:This electric liquid heater 1 is constituted of the metallic container 2 and the heat generating source 3 and temp. sensing part 4 installed in the bottom. The bumping preventive layer 5 consisting of the boiling agent layer 7 is provided on the fluororesin coating layer 6 on the inside surface in the bottom of the container 2. The fluororesin coating layer 6 is intended to prevent contamination and the boiling agent layer 7 is intended to facilitate the generation of bubbles and to release the bubbles before the formation thereof. The bubbles are generated with the inorg. boiling agent layer formed partially and discontinuously on the fluororesin coating layer 6 as nuclei in the case of use of fine inorg. powder as the boiling agent. The exposed fluororesin coating layer 6 exhibits the property to prevent contamination. The org. boiling agent layer is inferior in heat resistance and, therefore, partically peels on use in the case of an org. polymer but the fluororesin coating layer 6 is exposed to prevent the degradation in the contamination resistance.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は電気ポットなどの電気液
体加熱器、特に耐汚染性に優れ早切れによる誤動作のな
い電気液体加熱器に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric liquid heater such as an electric pot, and more particularly to an electric liquid heater which is excellent in stain resistance and does not malfunction due to premature cutting.

【0002】[0002]

【従来の技術】電気液体加熱器は手軽にかつ安全に液体
を加熱あるいは保温することができるため、電気ポッ
ト、酒かん器などとして広く使用されている。
2. Description of the Related Art Electric liquid heaters are widely used as electric pots, sake bottles and the like because they can easily and safely heat or keep liquid warm.

【0003】電気液体加熱器は、被加熱液体を収容する
容器と発熱源を有しており、通常、液体を所望の温度に
加熱・保温するために温度センサーが備えられている。
The electric liquid heater has a container for containing the liquid to be heated and a heat source, and is usually equipped with a temperature sensor for heating and keeping the liquid at a desired temperature.

【0004】この電気液体加熱器における大きな問題点
は、発熱源近傍の容器表面で生ずる突沸現象である。突
沸が生ずると大きな音が発生するほか、突沸すなわち気
泡が生じた部分の容器表面が過加熱されて表面温度が高
くなる。
A major problem with this electric liquid heater is the bumping phenomenon that occurs on the surface of the container near the heat source. When bumping occurs, a loud noise is generated, and the container surface where bumping, that is, bubbles are generated is overheated and the surface temperature rises.

【0005】突沸の問題に対しては、たとえば容器内面
にフッ素樹脂コーティング層を設けることが提案されて
おり(特公昭52-14665号公報)、また容器内面に金属酸
化物を熔射して突沸防止層を設けることも提案されてい
る(特公昭63-51003号公報)。
To solve the problem of bumping, it has been proposed, for example, to provide a fluororesin coating layer on the inner surface of the container (Japanese Patent Publication No. 52-14665), and the inner surface of the container is sprayed with a metal oxide for bumping. It has also been proposed to provide a preventive layer (Japanese Patent Publication No. 63-51003).

【0006】[0006]

【発明が解決しようとする課題】電気液体加熱器で温度
ムラなく早く加熱するには発熱源を容器底部に設けるの
が好ましい。しかし、容器底部のみの発熱源で液体を加
熱するには発熱源の容量を大きくしなければならない
が、そうすると発熱源近傍の容器表面の突沸の防止がよ
り一層難しくなる。たとえば、前記特公昭52-14665号公
報記載のフッ素樹脂コーティング層が設けられていて
も、気泡が大きくなり過加熱状態が生ずる。この過加熱
状態が温度センサー上で発生するとセンサーが湯温と関
係なく作動するという、いわゆる早切れを起してしま
う。そこで温度センサーを発熱源から離して容器側部に
設けることが考えられるが、そうすると液体量が少ない
ばあい、感知できなくなる。
In order to quickly heat the electric liquid heater with uniform temperature, it is preferable to provide a heat source at the bottom of the container. However, in order to heat the liquid with the heat source only at the bottom of the container, the capacity of the heat source must be increased, which makes it even more difficult to prevent bumping of the container surface near the heat source. For example, even if the fluororesin coating layer described in Japanese Patent Publication No. 52-14665 is provided, air bubbles become large and an overheated state occurs. When this overheating state occurs on the temperature sensor, the sensor operates regardless of the hot water temperature, that is, a so-called premature disconnection occurs. Therefore, it is conceivable to provide a temperature sensor on the side of the container away from the heat source, but if this is the case, it will not be possible to detect if the liquid amount is small.

【0007】一方、特公昭63-51003号公報に記載されて
いる突沸防止層を設けるときは、突沸自体はかなり減少
できるが、その効果をうるために突沸防止層の表面粗度
を50〜150 μmと大きくし層厚も50〜400 μmと厚くす
る必要がある。しかし、表面粗度が大きくなるとその凹
所に水アカなどの汚れが付着しやすくなるため、耐汚染
性に対して不利となる。さらに突沸防止層が厚くなると
熱伝導性もわるくなる。
On the other hand, when the bumping prevention layer described in Japanese Patent Publication No. 63-51003 is provided, the bumping itself can be considerably reduced, but in order to obtain the effect, the surface roughness of the bumping prevention layer is 50 to 150. It is necessary to make it as large as μm and the layer thickness as thick as 50 to 400 μm. However, when the surface roughness is high, stains such as water stains are likely to adhere to the recesses, which is disadvantageous to the stain resistance. Further, if the bumping prevention layer becomes thicker, the thermal conductivity becomes worse.

【0008】本発明は、発熱源と温度感知部を容器底部
に設けても突沸による温度センサーの早切れを起こさ
ず、しかも耐汚染性に優れた電気液体加熱器を提供する
ことを目的とする。
It is an object of the present invention to provide an electric liquid heater which does not cause premature boiling of the temperature sensor even if a heat source and a temperature sensing portion are provided at the bottom of the container and which is excellent in contamination resistance. ..

【0009】[0009]

【課題を解決するための手段】本発明の電気液体加熱器
1は、該加熱器の底部に設けられている発熱源3および
温度感知部4に少なくとも対応する容器2内面に、フッ
素樹脂コーティング層6を下層とし煮沸剤層7をその上
層とする耐汚染性に優れた突沸防止層5を設けてなるも
のである。
The electric liquid heater 1 of the present invention has a fluororesin coating layer on the inner surface of the container 2 at least corresponding to the heat source 3 and the temperature sensing unit 4 provided at the bottom of the heater. 6 is a lower layer, and the boiling agent layer 7 is an upper layer thereof, and the bumping prevention layer 5 excellent in stain resistance is provided.

【0010】[0010]

【作用】本発明によれば、突沸防止層5が接着エネルギ
ーの小さいフッ素樹脂コーティング層6の上に煮沸剤層
7を設けて形成されているため、煮沸剤層で気泡の発生
を容易にし、この気泡が大きく成長するまえに離脱する
ので過加熱状態は生じない。また、煮沸剤層を薄くする
ことができ、突沸防止層の全体の厚さも薄くすることが
できるため、熱伝導性の低下を防ぐことができると共
に、耐汚染性に優れたフッ素樹脂コーティング層によ
り、耐汚染性の低下を防ぐことができる。
According to the present invention, since the bumping prevention layer 5 is formed by providing the boiling agent layer 7 on the fluororesin coating layer 6 having a small adhesive energy, it is easy to generate bubbles in the boiling agent layer. Since the bubbles are released before they grow large, the overheated state does not occur. Further, the boiling agent layer can be made thin, and the entire thickness of the bumping prevention layer can be made thin, so that it is possible to prevent a decrease in thermal conductivity and a fluororesin coating layer excellent in stain resistance. It is possible to prevent the deterioration of the stain resistance.

【0011】[0011]

【実施例】本発明の電気液体加熱器の好ましい実施態様
を図面に基づいて説明する。
DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the electric liquid heater of the present invention will be described with reference to the drawings.

【0012】図1は本発明の電気液体加熱器の一実施態
様の概略断面図である。
FIG. 1 is a schematic sectional view of one embodiment of the electric liquid heater of the present invention.

【0013】電気液体加熱器1はステンレス鋼などの金
属製の容器2とその底部に設置された発熱源3および温
度感知部4からなる。そして容器2の底部内表面側に突
沸防止層5が設けられている。なお、発熱源3および温
度感知部4の構成、配置は両者が底部に設置されるので
あれば種々の態様をとることができる。
The electric liquid heater 1 comprises a container 2 made of metal such as stainless steel, a heat source 3 and a temperature sensing unit 4 installed at the bottom of the container 2. The bumping prevention layer 5 is provided on the inner surface side of the bottom of the container 2. The heat source 3 and the temperature sensing unit 4 may have various configurations and arrangements as long as they are installed at the bottom.

【0014】本発明の特徴は、容器2の内表面にフッ素
樹脂コーティング層6とその上に設けられている煮沸剤
層7とからなる突沸防止層5を設ける点にある。
The feature of the present invention resides in that a bumping prevention layer 5 comprising a fluororesin coating layer 6 and a boiling agent layer 7 provided thereon is provided on the inner surface of the container 2.

【0015】フッ素樹脂コーティング層6は主として汚
れ防止を目的とするものであり、煮沸剤層7が粗表面で
あるために生じやすい汚れの防止や除去を容易にする。
用いるフッ素樹脂としては、たとえばポリテトラフルオ
ロエチレン(PTFE)、テトラフルオロエチレン- パーフル
オロアルキルビニルエーテル共重合体(PFA) 、テトラフ
ルオロエチレン- ヘキサフルオロプロピレン共重合体(F
EP) などがあげられる。これにポリイミド、ポリアミド
イミド、ポリエーテルサルホン、ポリサルホン、エポキ
シ樹脂、ポリオルガノシロキサンなどの有機バインダー
や溶媒を配合した組成物を容器に塗布・乾燥し、焼成す
ることによりコーティング層6を形成することができ
る。コーティング層6は容器の底部だけでなく、容器の
内表面全体に形成してもよい。フッ素樹脂コーティング
層の厚さは通常10〜40μm、好ましくは20〜30μm程度
である。
The fluororesin coating layer 6 is mainly intended to prevent stains, and since the boiling agent layer 7 has a rough surface, it facilitates the prevention and removal of stains that are likely to occur.
Examples of the fluororesin used include polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), tetrafluoroethylene-hexafluoropropylene copolymer (F
EP) and the like. To form a coating layer 6 by applying a composition prepared by mixing an organic binder or solvent such as polyimide, polyamideimide, polyether sulfone, polysulfone, epoxy resin, or polyorganosiloxane to a container, drying, and baking. You can The coating layer 6 may be formed not only on the bottom of the container but also on the entire inner surface of the container. The thickness of the fluororesin coating layer is usually 10 to 40 μm, preferably about 20 to 30 μm.

【0016】煮沸剤層7は、気泡の発生を容易にすると
共に気泡が成長するまえに離脱させるために設けられ
る。煮沸剤としては、コロイダルシリカ、シリカパウダ
ー、アルミナ粉末、リチウムシリケート粉末などの水濡
れ性の大きい、平均粒径約0.01〜0.1 μmの無機微粉末
やカルボキシビニルポリマー、メチルセルロース、エチ
ルセルロース、ヒドロキシセルロースなどの水濡れ性の
大きい有機ポリマーがあげられる。
The boiling agent layer 7 is provided for facilitating the generation of bubbles and for releasing the bubbles before they grow. Examples of the boiling agent include colloidal silica, silica powder, alumina powder, lithium silicate powder, and other inorganic fine powders having an average particle diameter of about 0.01 to 0.1 μm and carboxyvinyl polymer, methylcellulose, ethylcellulose, hydroxycellulose, etc. Organic polymers having high water wettability are mentioned.

【0017】無機微粉末を用いるばあいは、これをジメ
チルアセトアミド、ジメチルフォルムアミド、N-メチル
-2- ピロリドンなどの溶媒に濃度約10〜30重量%となる
ように分散させ、必要によっては界面活性剤を添加し、
えられた分散液をフッ素樹脂コーティング層上に塗布・
乾燥・焼成する。焼成温度は約360 〜400 ℃が好まし
い。図2に示すように、えられる無機煮沸剤層8は無機
微粉末がフッ素樹脂コーティング層6上に部分的に付着
した状態である。無機煮沸剤層8はフッ素樹脂コーティ
ング層6の表面の20〜60%、特に30〜50%を覆うように
設けるのが好ましい。このように部分的に不連続に形成
された無機煮沸剤層を核に気泡が生じる。一方、フッ素
樹脂コーティング層も露出しているから、フッ素樹脂の
特性である汚れ防止性が充分発揮でき、耐汚染性の低下
を防止できる。
When an inorganic fine powder is used, it is added to dimethylacetamide, dimethylformamide, N-methyl.
-2-Disperse in a solvent such as pyrrolidone to a concentration of about 10 to 30% by weight, and add a surfactant if necessary,
Apply the obtained dispersion on the fluororesin coating layer.
Dry and bake. The firing temperature is preferably about 360-400 ° C. As shown in FIG. 2, the obtained inorganic boiling agent layer 8 is in a state where the inorganic fine powder is partially adhered to the fluororesin coating layer 6. The inorganic boiling agent layer 8 is preferably provided so as to cover 20 to 60%, particularly 30 to 50% of the surface of the fluororesin coating layer 6. Bubbles are generated in the nucleus of the inorganic boiling agent layer thus partially formed discontinuously. On the other hand, since the fluororesin coating layer is also exposed, the antifouling property, which is a characteristic of the fluororesin, can be sufficiently exerted, and the deterioration of stain resistance can be prevented.

【0018】有機ポリマーを用いるばあい、濃度0.05〜
0.1 重量%程度の水溶液とし、これをフッ素樹脂コーテ
ィング層に薄く塗布したのち、約150 〜250 ℃で約10〜
30秒間焼成して煮沸剤層を形成する。その結果、図3に
示すように、非常に薄い均一な膜が有機煮沸剤層9とし
てフッ素樹脂コーティング層上に形成される。形成され
た有機煮沸剤層9は優れた突沸防止作用を示すが耐熱性
に劣るため、使用するにつれて部分的に剥離していき、
下層のフッ素樹脂コーティング層6が露出してくる。し
たがって、汚れがそれほど問題とならない使用開始初期
には優れた突沸防止効果がえられ、汚れが問題となる時
期には有機煮沸剤層が部分的に剥がれて汚れ防止に優れ
たフッ素樹脂コーティング層が露出し、耐汚染性の低下
を防止できる。そのばあい、突沸の防止は残存する有機
煮沸剤層が前記無機煮沸剤層と同様の働きをして気泡の
核となり、突沸を有効に防止できる。
When an organic polymer is used, the concentration is 0.05-
Prepare an aqueous solution of about 0.1% by weight, apply this solution thinly on the fluororesin coating layer, and then apply about 10-
Bake for 30 seconds to form a boiling agent layer. As a result, as shown in FIG. 3, a very thin uniform film is formed on the fluororesin coating layer as the organic boiling agent layer 9. The formed organic boiling agent layer 9 has an excellent anti-bumping effect, but is inferior in heat resistance, and therefore peels off partially as it is used,
The lower fluororesin coating layer 6 is exposed. Therefore, an excellent effect of preventing bumping can be obtained in the early stage of use when the stain is not a serious problem, and the organic boiling agent layer is partially peeled off at the time when the stain becomes a problem, so that the fluororesin coating layer excellent in the stain prevention can be obtained. It is exposed and can prevent deterioration of stain resistance. In that case, the bumping prevention can be effectively prevented by the remaining organic boiling agent layer functioning similarly to the inorganic boiling agent layer and becoming a nucleus of bubbles.

【0019】なお、無機微粉末を用いるばあい、煮沸剤
用の溶媒がフッ素樹脂コーティング層を膨潤して無機微
粉末をしっかりと付着させるので、フッ素樹脂コーティ
ング層を焼成するまえに無機微粉末を塗布・乾燥し、両
者を同時に焼成するのが好ましい。フッ素樹脂コーティ
ング層を先に焼成すると無機微粉末の付着性がわるくな
り、ハジキが生じてしまう。有機ポリマーを用いるばあ
いは、フッ素樹脂コーティング層の焼成時期は有機ポリ
マーの塗布の前でも後でもよい。煮沸剤層の厚さは厚く
すると耐汚染性がわるくなり、薄くすると突沸防止効果
がえられなくなるので10μm以下、特に2〜5μmとす
るのが好ましく、また伝熱性の点で有利である。
When the inorganic fine powder is used, the solvent for the boiling agent swells the fluororesin coating layer and firmly adheres the inorganic fine powder, so that the inorganic fine powder should be adhered before firing the fluororesin coating layer. It is preferable to coat and dry the both, and simultaneously calcine both. If the fluororesin coating layer is fired first, the adhesion of the inorganic fine powder will be deteriorated and cissing will occur. When an organic polymer is used, the fluororesin coating layer may be fired before or after the application of the organic polymer. If the thickness of the boiling agent layer is thick, the stain resistance becomes poor, and if it is thin, the effect of preventing bumping cannot be obtained. Therefore, it is preferably 10 μm or less, particularly 2 to 5 μm, and it is advantageous in terms of heat conductivity.

【0020】したがって、フッ素樹脂コーティング層と
煮沸剤層からなる突沸防止層の全厚を12〜50μm、好ま
しくは22〜35μmとすることができる。
Therefore, the total thickness of the bumping prevention layer consisting of the fluororesin coating layer and the boiling agent layer can be 12 to 50 μm, preferably 22 to 35 μm.

【0021】発熱源は従来より電気液体加熱器に用いら
れている面状発熱体などをそのまま使用できる。発熱源
は容器の底部に渦巻き状、波形などの形態で配置され
る。温度感知器は同じく容器の底部で発熱源から直接加
熱されない位置に配設される。発熱源と温度感知器とは
従来の通常の方法により固定される。
As a heat source, a sheet-like heating element or the like which has been conventionally used in an electric liquid heater can be used as it is. The heat source is arranged at the bottom of the container in the form of a spiral, a corrugation or the like. The temperature sensor is also arranged at the bottom of the container at a position where it is not directly heated by the heat source. The heat source and the temperature sensor are fixed by conventional conventional methods.

【0022】本発明の電気液体加熱器では、1500Wとい
う大きな電力を加えても早切れが起こらず、従来より早
く安定して液体を加熱することができる。
In the electric liquid heater of the present invention, even if a large electric power of 1500 W is applied, premature disconnection does not occur and the liquid can be heated more stably than before.

【0023】本発明の電気液体加熱器の効果をつぎの方
法により確認した。
The effect of the electric liquid heater of the present invention was confirmed by the following method.

【0024】実施例1 底部に発熱源および温度感知器を有する消費電力800 W
の電気ポット(2.2 リットル)の容器(SUS 431) の底部
内表面につぎの手順で突沸防止層を形成した。
Example 1 Power consumption 800 W with a heat source and temperature sensor on the bottom
A bumping prevention layer was formed on the inner surface of the bottom of the container (SUS 431) of the electric pot (2.2 liters) according to the following procedure.

【0025】低分子量ポリテトラフルオロエチレン(商
品名:ルブロンL-5、ダイキン工業(株)製)14部(重
量部、以下同様)、ポリエーテルサルホン(5003p、IC
I 社製)14部、N-メチル-2- ピロリドン60.6部、メチル
イソブチルケトン23.8部、メチルエチルケトン14部、ト
ルエン14部をサンドミルで分散混合したものを容器の底
部内表面に、焼成後の厚さが25μmとなるように塗布し
乾燥した。ついで、コロイダルシリカ(粒径0.01μm)
の20重量%N-メチル-2- ピロリドン分散液に界面活性剤
を添加したのちこれを焼成後の厚さが3μmになるよう
に塗布・乾燥し、フッ素樹脂コーティング層と共に380
℃で15分間焼成して突沸防止層を形成した。
Low molecular weight polytetrafluoroethylene (trade name: Lubron L-5, manufactured by Daikin Industries, Ltd.) 14 parts (parts by weight, the same applies hereinafter), polyether sulfone (5003p, IC
(Company I) 14 parts, N-methyl-2-pyrrolidone 60.6 parts, methyl isobutyl ketone 23.8 parts, methyl ethyl ketone 14 parts, toluene 14 parts dispersed and mixed in a sand mill on the bottom inner surface of the container, the thickness after firing Of 25 μm was applied and dried. Next, colloidal silica (particle size 0.01 μm)
After adding a surfactant to the 20 wt% N-methyl-2-pyrrolidone dispersion liquid of, then coating and drying this so that the thickness after baking will be 3 μm, and 380 with the fluororesin coating layer.
The bumping prevention layer was formed by firing at 15 ° C. for 15 minutes.

【0026】えられた突沸防止層を電子顕微鏡(500
倍)で観察したところ、図4に示すようにコロイダルシ
リカの無機煮沸剤層8がフッ素樹脂コーティング層6上
に海島構造的に形成されていた。
The obtained anti-bumping layer was observed with an electron microscope (500
4), an inorganic boiling agent layer 8 of colloidal silica was formed on the fluororesin coating layer 6 in a sea-island structure as shown in FIG.

【0027】このポットに水1リットルを入れ加熱した
ところ、9分後に100 ℃に達した。
When 1 liter of water was placed in this pot and heated, it reached 100 ° C. after 9 minutes.

【0028】実施例2 実施例1と同じ型の電気ポットの容器に実施例1と同様
にしてフッ素樹脂組成物を塗布・乾燥し、380 ℃で15分
間焼成してフッ素樹脂コーティング層を形成した。この
コーティング層に濃度0.07重量%のメチルセルロース水
溶液を薄く塗布したのち、200 ℃で20秒間焼付けて煮沸
剤層を形成した。煮沸剤層の厚さは2μmであった。
Example 2 A fluororesin composition was applied to a container of an electric pot of the same type as in Example 1 and dried in the same manner as in Example 1 and dried at 380 ° C. for 15 minutes to form a fluororesin coating layer. .. A 0.07% by weight aqueous solution of methylcellulose was thinly applied to this coating layer and then baked at 200 ° C. for 20 seconds to form a boiling agent layer. The boiling agent layer had a thickness of 2 μm.

【0029】このポットに水1リットルを入れ加熱した
ところ、9分後に100 ℃に達した。
When 1 liter of water was placed in this pot and heated, the temperature reached 100 ° C. after 9 minutes.

【0030】比較例1 実施例1と同様にしてフッ素樹脂コーティング層を塗
布、乾燥、焼成して形成した電気ポットに水1リットル
を入れ加熱したところ、5分後に沸騰完了のアラームが
鳴り、保温状態に入ったが、水は沸騰していないという
トラブルが生じた。これは、容器内面の温度センサー上
にフッ素樹脂コーティング層のみを形成すると、フッ素
樹脂の撥水性のため、かえって気泡が大きく成長し、温
度センサーが誤動作したからであると考えられる。
Comparative Example 1 In the same manner as in Example 1, 1 liter of water was placed in an electric pot formed by coating, drying and firing a fluororesin coating layer and heated. After 5 minutes, an alarm indicating completion of boiling sounded and the temperature was kept warm. I entered the state, but there was a problem that the water was not boiling. This is considered to be because if only the fluororesin coating layer was formed on the temperature sensor on the inner surface of the container, the water repellency of the fluororesin caused the bubbles to grow larger and the temperature sensor malfunctioned.

【0031】つぎに耐汚染性について、つぎの要領で調
べた。
Next, the stain resistance was examined in the following manner.

【0032】加工パネル(5cm×10cm、SUS 430 )に実
施例1および2の要領で突沸防止層を形成した。この加
工パネルを、純水90gに炭酸カルシウム5gおよび炭酸
マグネシウム5gを溶解した水溶液に浸漬し、85〜95℃
で20日間放置後取り出し、水洗乾燥したのち付着物の量
を測定した。比較のため突沸防止層を形成しなかった加
工パネルについても行なった。
A bumping prevention layer was formed on a processed panel (5 cm × 10 cm, SUS 430) in the same manner as in Examples 1 and 2. This processed panel is immersed in an aqueous solution in which 5 g of calcium carbonate and 5 g of magnesium carbonate are dissolved in 90 g of pure water, and the temperature is 85 to 95 ° C.
After leaving it for 20 days, it was taken out, washed with water and dried, and the amount of the adhered matter was measured. For comparison, a processed panel in which the bumping prevention layer was not formed was also performed.

【0033】その結果、突沸防止層未形成パネルでは1.
40mg/cm2 の付着物が生じていたが、実施例1および2
の突沸防止層を形成したパネルはいずれも0.15mg/cm2
および0.18mg/cm2 と極めて付着物が少なく、優れた耐
汚染性を示した。
As a result, in the panel in which the bumping prevention layer is not formed, 1.
Although 40 mg / cm 2 of deposits had formed, Examples 1 and 2
0.15 mg / cm 2 for all panels with the bumping prevention layer
And 0.18 mg / cm 2 showed very little deposit and showed excellent stain resistance.

【0034】[0034]

【発明の効果】本発明の電気液体加熱器は、突沸を有効
に防止できかつ温度感知器の早切れを起さず、安定かつ
速く加熱することができ、しかも耐汚染性に優れたもの
である。
INDUSTRIAL APPLICABILITY The electric liquid heater of the present invention is capable of effectively preventing bumping, capable of heating stably and quickly without causing premature disconnection of the temperature sensor, and excellent in stain resistance. is there.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の電気液体加熱器の一実施態様の概略断
面図である。
FIG. 1 is a schematic cross-sectional view of one embodiment of the electric liquid heater of the present invention.

【図2】本発明の電気液体加熱器の底部の構造を示す一
実施態様の概略断面図である。
FIG. 2 is a schematic cross-sectional view of one embodiment showing the structure of the bottom portion of the electric liquid heater of the present invention.

【図3】本発明の電気液体加熱器の底部の構造を示す別
の実施態様の概略断面図である。
FIG. 3 is a schematic cross-sectional view of another embodiment showing the structure of the bottom portion of the electric liquid heater of the present invention.

【図4】実施例1で形成された突沸防止層の電子顕微鏡
写真の模式図である。
FIG. 4 is a schematic view of an electron micrograph of the bumping prevention layer formed in Example 1.

【符号の説明】[Explanation of symbols]

1 電気液体加熱器 2 容器 3 発熱源 4 温度感知部 5 突沸防止層 6 フッ素樹脂コーティング層 7 煮沸剤層 8 無機煮沸剤層 9 有機煮沸剤層 1 Electric Liquid Heater 2 Container 3 Heat Source 4 Temperature Sensing Part 5 Bumping Prevention Layer 6 Fluorine Resin Coating Layer 7 Boiling Agent Layer 8 Inorganic Boiling Agent Layer 9 Organic Boiling Agent Layer

フロントページの続き (72)発明者 西長 昌昭 大阪府摂津市西一津屋1番1号 ダイキン 工業株式会社淀川製作所内 (72)発明者 和田 信義 大阪府摂津市西一津屋1番1号 ダイキン 工業株式会社淀川製作所内Continued Front Page (72) Masaaki Nishicho, 1-1 Nishiichitsuya, Settsu City, Osaka Prefecture Daikin Industries, Ltd. Yodogawa Manufacturing Co., Ltd. (72) Nobuyoshi Wada 1-1, Nishiichitsuya, Settsu City, Osaka Prefecture Daikin Industries, Ltd. Yodogawa Factory

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 電気液体加熱器の容器の底部に発熱源と
温度感知部を設け、少なくとも発熱源と温度感知部に対
応する容器内面に、フッ素樹脂コーティング層を下層と
し、煮沸剤層をその上層とする耐汚染性に優れた突沸防
止層を設けてなる電気液体加熱器。
1. A heating source and a temperature sensing part are provided at the bottom of a container of an electric liquid heater, and at least the inside of the container corresponding to the heating source and the temperature sensing part has a fluororesin coating layer as a lower layer and a boiling agent layer. An electric liquid heater provided with an upper layer having a bumping prevention layer excellent in stain resistance.
【請求項2】 煮沸剤層が無機微粉末の層である請求項
1記載の電気液体加熱器。
2. The electric liquid heater according to claim 1, wherein the boiling agent layer is a layer of inorganic fine powder.
【請求項3】 煮沸剤層がフッ素樹脂コーティング層表
面の20〜60%を覆っている請求項2記載の電気液体加熱
器。
3. The electric liquid heater according to claim 2, wherein the boiling agent layer covers 20 to 60% of the surface of the fluororesin coating layer.
【請求項4】 煮沸剤層が有機ポリマーの層である請求
項1記載の電気液体加熱器。
4. The electric liquid heater according to claim 1, wherein the boiling agent layer is a layer of an organic polymer.
JP28768691A 1991-11-01 1991-11-01 Electric liquid heater Expired - Fee Related JP3221017B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP28768691A JP3221017B2 (en) 1991-11-01 1991-11-01 Electric liquid heater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP28768691A JP3221017B2 (en) 1991-11-01 1991-11-01 Electric liquid heater

Publications (2)

Publication Number Publication Date
JPH05123246A true JPH05123246A (en) 1993-05-21
JP3221017B2 JP3221017B2 (en) 2001-10-22

Family

ID=17720420

Family Applications (1)

Application Number Title Priority Date Filing Date
JP28768691A Expired - Fee Related JP3221017B2 (en) 1991-11-01 1991-11-01 Electric liquid heater

Country Status (1)

Country Link
JP (1) JP3221017B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2386532A (en) * 2001-11-29 2003-09-17 Strix Ltd Electric water heater with reduced noise level
JP2013513463A (en) * 2009-12-18 2013-04-22 サン−ゴバン パフォーマンス プラスティックス コーポレイション Cooking release sheet material and release surface
KR101272597B1 (en) * 2011-04-21 2013-06-10 (주)피엔유에코에너지 Electric pot with SR heating element
US11230648B2 (en) 2016-10-24 2022-01-25 Saint-Gobain Performance Plastics Corporation Polymer compositions, materials, and methods of making

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2386532A (en) * 2001-11-29 2003-09-17 Strix Ltd Electric water heater with reduced noise level
GB2386532B (en) * 2001-11-29 2005-12-21 Strix Ltd Electric water heaters
JP2013513463A (en) * 2009-12-18 2013-04-22 サン−ゴバン パフォーマンス プラスティックス コーポレイション Cooking release sheet material and release surface
US8673449B2 (en) 2009-12-18 2014-03-18 Saint-Gobain Performance Plastics Corporation Cooking release sheet materials and release surfaces
KR101492430B1 (en) * 2009-12-18 2015-02-11 생-고뱅 퍼포먼스 플라스틱스 코포레이션 A method of cooking a meat product
US9314132B2 (en) 2009-12-18 2016-04-19 Saint-Gobain Per.Plastics Corporation Cooking release sheet materials and release surfaces
KR101272597B1 (en) * 2011-04-21 2013-06-10 (주)피엔유에코에너지 Electric pot with SR heating element
US11230648B2 (en) 2016-10-24 2022-01-25 Saint-Gobain Performance Plastics Corporation Polymer compositions, materials, and methods of making

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