JP3656621B2 - Electric water heater - Google Patents

Electric water heater Download PDF

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Publication number
JP3656621B2
JP3656621B2 JP2002225799A JP2002225799A JP3656621B2 JP 3656621 B2 JP3656621 B2 JP 3656621B2 JP 2002225799 A JP2002225799 A JP 2002225799A JP 2002225799 A JP2002225799 A JP 2002225799A JP 3656621 B2 JP3656621 B2 JP 3656621B2
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JP
Japan
Prior art keywords
water
container
amount
water supply
heating
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Expired - Fee Related
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JP2002225799A
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Japanese (ja)
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JP2004065361A (en
Inventor
正治 大橋
政司 神原
史太佳 小笠原
尚 和田
一幸 島田
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.)
Panasonic Corp
Panasonic Holdings Corp
Original Assignee
Panasonic Corp
Matsushita Electric Industrial Co Ltd
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Priority to JP2002225799A priority Critical patent/JP3656621B2/en
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Description

【0001】
【発明の属する技術分野】
本発明は湯沸かし容器と給水容器とを備えた電気湯沸かし器に関し、特に、給水・湯沸かし動作に関するものである。
【0002】
【従来の技術】
近年、消費湯量が多い場合でも湯切れを起こしにくいようにするため、湯沸かし容器とこの湯沸かし容器に自動給水するための水を収納する給水容器とを備えた電気湯沸かし器が提案されている。
【0003】
この電気湯沸かし器によれば、湯沸かし容器内の湯が減った場合に給水容器より水を供給し、湯切れを起こさないように使用毎に満水まで給水するというものであった。
【0004】
そして、湯沸かし容器の水なし状態の検出は、水位管に設けた水位センサにより水なし状態を検出するものと、ヒータで加熱した時に湯沸かし容器底面に設けた温度センサにより急激な温度上昇を検出して水なし状態を検出するものがあった。
【0005】
【発明が解決しようとする課題】
しかしながら、前記従来の電気湯沸かし器では、給水動作と加熱動作を同時に行う場合に、水位センサによるものでは、水位管の曇りや、水面の揺らぎ、故障等で水なし(空焼き)状態を誤検出するという問題を有していた。
【0006】
同様に、温度センサによるものも、湯沸かし容器のお湯と給水容器から自動給水された水が混ざることにより、水温の揺らぎが大きくなって、水があるのに温度センサが急激な温度上昇を検出して水なし状態を誤検出するという問題を有していた。
【0007】
本発明は前記従来の課題を解決するもので、湯沸かし容器の水なし状態の誤検出を防止し、給水動作中でも加熱動作を行うことで湯沸かし時間を短縮し、安全で使い勝手の良い電気湯沸かし器を実現することを目的とする。
【0008】
【課題を解決するための手段】
前記従来の課題を解決するために、本発明の電気湯沸かし器は、湯を沸かして保温する湯沸かし容器と、前記湯沸かし容器を加熱する加熱手段と、前記湯沸かし容器内の水量を検知する水量検知手段と、水を収容する給水容器と、前記給水容器の水を前記湯沸かし容器に給水する給水手段とを備えた電気湯沸かし器であって、前記給水手段が動作すると前記加熱手段を停止または加熱量を減少させ、前記水量検知手段が第1の水量を検知すると前記加熱手段を駆動または加熱量を増加させ、第1の水量より多い第2の水量を検知すると前記給水手段を停止し、温度検知手段を有し、前記給水手段が動作する期間は、前記温度検出手段による前記湯沸かし容器の水なし状態の検出を行わないようにしたものである。
【0009】
この構成により、湯沸かし容器の水なし状態の誤検出を防止し、給水動作中でも加熱動作を行うことができ、湯沸かし時間を短縮することができる。さらに、水あり状態の誤検出を防止することができる。
【0010】
【発明の実施の形態】
請求項1に記載した発明は、湯を沸かして保温する湯沸かし容器と、前記湯沸かし容器を加熱する加熱手段と、前記湯沸かし容器内の水量を検知する水量検知手段と、水を収容する給水容器と、前記給水容器の水を前記湯沸かし容器に給水する給水手段とを備えた電気湯沸かし器であって、前記給水手段が動作すると前記加熱手段を停止または加熱量を減少させ、前記水量検知手段が第1の水量を検知すると前記加熱手段を駆動または加熱量を増加させ、第1の水量より多い第2の水量を検知すると前記給水手段を停止するようにしたものである。
【0011】
この構成により、湯沸かし容器の水なし状態の誤検出を防止し、給水動作中でも加熱動作を行うことができ、湯沸かし時間を短縮することができる。さらに、水あり状態の誤検出を防止することができる。
【0012】
請求項に記載した発明は、湯を沸かして保温する湯沸かし容器と、前記湯沸かし容器を加熱する加熱手段と、前記湯沸かし容器内の水量を検知する水量検知手段と、水を収容する給水容器と、前記給水容器の水を前記湯沸かし容器に給水する給水手段とを備えた電気湯沸かし器であって、前記給水手段が動作すると前記加熱手段を停止または加熱量を減少させ、前記水量検知手段が第1の水量を検知すると前記加熱手段を駆動または加熱量を増加させ、第1の水量より多い第2の水量を検知すると前記給水手段を停止し、前記給水手段が動作を終了すると、前記温度検出手段による前記湯沸かし容器の水なし状態の検出を行う構成により、湯沸かし容器の水なし状態の誤検出を防止し、給水動作中でも加熱動作を行うことができ、湯沸かし時間を短縮することができる。さらに、水あり状態の検出をより確実にしているので、安全性を向上することができる。
【0013】
請求項に記載した発明は、前記温度検出手段による前記湯沸かし容器の水なし状態の検出を開始するタイミングを、前記給水手段が動作を終了してから所定時間経過後に行う構成により、湯沸かし容器のお湯と給水容器から自動給水された水が混ざる時の水温の揺らを防止することができる。
【0014】
請求項に記載した発明は、湯を沸かして保温する湯沸かし容器と、前記湯沸かし容器を加熱する加熱手段と、前記湯沸かし容器内の水量を検知する水量検知手段と、水を収容する給水容器と、前記給水容器の水を前記湯沸かし容器に給水する給水手段とを備えた電気湯沸かし器であって、前記給水手段が動作すると前記加熱手段を停止または加熱量を減少させ、前記水量検知手段が第1の水量を検知すると前記加熱手段を駆動または加熱量を増加させ、第1の水量より多い第2の水量を検知すると前記給水手段を停止し、前記給水手段と前記加熱手段が同時動作するのを禁止するスイッチを有し、前記解除スイッチを有効にすると前記給水手段が動作を終了してから、前記加熱手段の動作を開始する構成により、湯沸かし容器の水なし状態の誤検出を防止し、給水動作中でも加熱動作を行うことができ、湯沸かし時間を短縮することができる。さらに、同時動作する時より消費電力を小さくすることでブレーカを落ちることを防止し、利便性が向上することができる。
【0015】
【実施例】
(実施例1)
以下、本発明の実施例1について図面を用いて説明する。図1は本発明の実施例における電気湯沸かし器のブロック図である。図1において、1は収容した液体を沸かして保温する湯沸かし容器、2は湯沸かし容器1に当接し、湯沸かし容器内の液体を加熱する第1の加熱手段と同様に湯沸かし容器内の液体を加熱・保温する第1の加熱手段よりも電力出力の小さな第2の加熱手段を示している。
【0016】
3は湯沸かし容器1に当接され、湯沸かし容器1内の液体の温度を検知する温度検知手段、5は沸騰検知手段で、前記温度検知手段3から得られる温度上昇勾配が所定の温度上昇勾配(本実施例では30秒/0.5℃とする)よりも勾配が緩やかになったことで湯沸かし容器1内の液体の沸騰検知をする。
【0017】
6は制御手段であり、前記温度検知手段3が沸騰境界温度(本実施例では約90℃とする)未満を検知すると前記加熱手段2を駆動し、その後、沸騰検知手段5によって沸騰を検知し、前記加熱手段2を停止させるように構成されている。
【0018】
8は保温中の液体を強制的に再加熱させる再加熱手段であり、前記制御手段6は前記加熱手段2を駆動し、その後、沸騰検知手段5によって沸騰を検知し、前記加熱手段2を停止させるように構成されている。
【0019】
10は出湯手段で、出湯スイッチ10bと湯沸かし容器1の底部から外部まで液体を送り出す水位管10hとこの水位管中に構成され液体を外部まで送り出すポンプ10iから構成されている。
【0020】
7は水量検知手段であり、水位管10hと水位管10hに対向して取り付けた赤外線発光素子と受光素子で構成している。そして、湯沸かし容器1と液面が同じになる水位管10hの液面レベルを検知することにより、湯沸かし容器の水位を検知する。7aは満水位置に設置した満水検知、7bは湯沸かし容器1の空焼き防止するために加熱手段を停止する位置に設置した給水検知、7cは満水検知7aと給水検知7bとの間に設置し、傾斜されても前記湯沸かし容器の空焼き状態を防ぎ、安全が確保できる中間検知である。
【0021】
4は湯沸かし容器に給水するための水を収容する給水容器、9は給水容器4の水を給水管15を介して湯沸かし容器1に給水する給水手段で、給水モータ9aより構成している。
【0022】
14は報知手段であり、湯沸し中や保温中等の動作を表示、報知するものである。
【0023】
図2は本発明の実施例における電気湯沸かし器の回路図である。図2において、11は交流電源、12は直流電源である。前記第1の加熱手段および第2の加熱手段を構成する加熱手段2は、湯沸かし容器内の液体を加熱する第1の発熱体2aと、第1の発熱体2aよりも加熱電力が小さく湯沸かし容器内の液体を加熱する第2の発熱体2bと、これに交流電源11と直列に接続されたリレー接点2c、2dと、このリレー接点2c、2dの制御を行うリレーコイル2e、2fで構成され、このリレーコイルに電流を流し、前記リレー接点を閉じるようになっている。
【0024】
前記温度検知手段3は、温度を抵抗値に変換する感温素子3aと、この感温素子3aと抵抗3bとで分圧電圧値をつくり、これを2進符号に変換するAD変換器3cに入力される。AD変換器3cは約30〜120℃の範囲を単位温度幅(本実施例では約0.5℃とする)の温度刻みにし、この単位温度上昇するごとの信号を出力している。
【0025】
前記再加熱手段8は、保温中の液体を強制的に再加熱するための入力でスイッチ8a、抵抗8b、8cで構成される。
【0026】
前記報知手段14は、ブザー14aによって沸騰終了などを報知し、LED14bは湯沸し中に表示し、14cは保温中に表示する。
【0027】
前記出湯手段10は、湯沸かし容器内の液体を外部に送り出す電動ポンプ10iを駆動させるモータ10aとこのモータ10aと直列に接続された出湯スイッチ10b、トランジスタ10cおよびこのトランジスタ10cをオン状態にする信号を出力するロック解除スイッチ10eから構成されている。
【0028】
出湯はロック解除スイッチ10eをオンでトランジスタ10cをオンとなるロック解除状態で、出湯スイッチ10bがオンの時に出湯できるようになっている。従って、ロック解除スイッチ10eをオフでトランジスタ10cがオフしたロック状態では出湯スイッチ10bをオンにしても出湯できないようになっている。更に、出湯終了から一定時間(本実施例では10秒とする)次の出湯が行われなければ前記トランジスタ10cは再びオフ状態となり出湯スイッチ10bをオンするだけでは出湯できないようになっている。
【0029】
前記水量検知手段7は、赤外線発光素子と受光素子で構成され、満水検知をすると水位検知7aがオン、給水検知をすると水位検知7bがオン、中間検知をすると水位検知7cがオンする。
【0030】
前記給水手段9は、給水モータ9aとトランジスタ9bより構成されている。前記給水容器4の水を前記湯沸かし容器1に給水する場合はトランジスタ9bをオン状態にすることで給水モータ9aを駆動させることで行う。
【0031】
13はマイクロコンピュータ(以後マイコンと略する)でプログラムを実行することで、前記沸騰検知手段5、前記制御手段6および給水・湯沸かしの動作を実現している。
【0032】
図3は、本発明の実施例におけるマイコン13に記憶されたプログラムの給水・湯沸かしの動作をフローチャートに示したものである。以下、この動作を説明する。
【0033】
まず、100で制御手段6は水量検知手段9の検知水量が給水検知7bすると、101で加熱手段2をオフし、102で給水モータ9aをオンさせ給水を開始する。そして、103で水位が中間検知7cになると、104で加熱手段2をオンし加熱を開始する。さらに給水を続け水位が上昇し、105で満水検知7aに到達すると給水モータ9aをオフし給水動作を終了する。
【0034】
この後も給水された水は温度検知手段3により沸騰を検知するまで加熱手段2を加熱し、107で沸騰検知をすると、108で加熱手段2をオフする。以降は保温動作を行う。この状態から湯沸かし容器1のお湯は適宜使用され、その水位は低下していく。出湯して水位が給水検知7bになると出湯終了後、再び給水を開始する。
【0035】
なお、本実施例で前記給水モータ9aがオン期間、前記湯沸かし容器1が空焚きにならないように加熱手段2のオンオフを繰り返して加熱量を減らすこともできる。この場合、更に安全性が向上する。
【0036】
以上のように本実施例において、本体を傾斜されても前記湯沸かし容器の空焼き状態を防ぎ、安全が確保できる水量から加熱動作を行うので、水あり状態の検出を確実にしているので、安全性を向上することができる。更に、給水動作中でも加熱動作を行うことができるので湯沸かし時間を短縮することができる。
【0037】
なお、本実施例では前記水量検出手段7の水位位置を満水検知7a、給水検知7b、中間検知7cの3点としているが、水位位置を満水検知7a、給水検知7bの2点にしても良い。この場合、前記給水モータ9aが動作中には前記水量検出手段7が満水検知7aするまで前記加熱手段をオンしないようなる。
【0038】
また、前記水量検出手段7の中間検知7cを計時手段のタイマで実現しても良い。これにより低コストで湯沸かし容器の水なし状態の誤検出を防止することができる。
【0039】
なお、本実施例では前記給水モータ9aを用いて前記給水容器4から前記湯沸かし容器1へ水を給水するとしているが、前記給水容器4が前記湯沸かし容器1より高い位置に設置している場合は給水弁等でも良い。
【0040】
(実施例2)
以下、本発明の実施例2について説明する。図4は本発明の実施例2における電器湯沸し器のブロック図である。なお、本実施例と実施例1との基本構成はほぼ同じなので説明は省略し、異なる点を中心に説明する。また、実施例1と同じ構成要素には、同じ符号を付しその説明は省略する。
【0041】
図4において、20は水なし状態検知手段で、前記温度検知手段3から得られる温度上昇勾配が所定の温度上昇勾配(本実施例では0.5秒/0.5℃とする)よりも勾配が急激になったことで前記湯沸かし容器1内の水なし状態の検出を行う。
【0042】
21はLCD、LED等の動作状態表示手段で、前記給水手段、前記加熱手段の動作状態を表示する。22は前記給水手段と前記加熱手段が同時動作するのを禁止するスイッチである。
【0043】
図5は、本発明の実施例2におけるマイコン13に記憶されたプログラムの給水・湯沸かしの動作をフローチャートに示したものである。以下、この動作を説明する。
【0044】
まず、200で制御手段6は水量検知手段9の検知水量が給水検知7bすると、201で加熱手段2をオフする。加熱手段2がオフすると202で前記水なし状態検知手段による水なし状態の検出を停止する。203で給水モータ9aをオンさせ給水を開始する。そして、204で水位が中間検知7cになると、205で加熱手段2をオンし加熱を開始する。さらに給水を続け水位が上昇し、206で満水検知7aに到達すると給水モータ9aをオフし給水動作を終了する。
【0045】
この後、208で加熱手段2をオフし、209で水温の揺らぎがなくなる所定時間(本実施例では、ヒータの電力700W、湯沸かし容器の水量1.5リットルで20秒とする)待って、210で加熱手段2をオンし再加熱を行う。この時に、211で前記水なし状態検知手段による水なし状態の検出を開始する。
【0046】
そして、沸騰を検知するまで加熱手段2を加熱し、212で沸騰検知をすると、213で加熱手段2をオフする。以降は保温動作を行う。
【0047】
なお、本実施例において給水・湯沸かしの動作中に動作状態表示手段21で、前記給水モータ9aと前記加熱手段2の動作状態を表示することにより、使用者が現在の状況を確認でき利便性が向上することができる。
【0048】
また、スイッチ22をオンにすると前記給水モータ9aと前記加熱手段2が同時動作するのを禁止する。すなわち、前記給水モータ9aが動作を終了してから、前記加熱手段2の動作を開始するようになる。これにより、同時動作する時より消費電力を小さくすることでブレーカを落ちることを防止し、利便性が向上することができる。
【0049】
以上のように本実施例において、前記温度検出手段による前記湯沸かし容器の水なし状態の検出は、前記給水手段が動作する期間は検出を行わない、前記給水手段が停止中は検出を行うので、水あり状態の検出をより確実にしているので、安全性を向上することができる。また、給水動作終了時の水温の揺らぎの影響を防止することができる。更に、給水動作中でも加熱動作を行うことができるので湯沸かし時間を短縮することができる。
【0050】
【発明の効果】
以上のように、請求項1からに記載の発明によれば、湯沸かし容器の水なし状態の誤検出を防止し、給水動作中でも加熱動作を行うことで湯沸かし時間を短縮し、安全で使い勝手の良い電気湯沸かし器を実現することができる。
【図面の簡単な説明】
【図1】 本発明の実施例1における電気湯沸かし器のブロック図
【図2】 同電気湯沸かし器の回路図
【図3】 同電気湯沸かし器の動作を示すフローチャート
【図4】 本発明の実施例2における電気湯沸かし器のブロック図
【図5】 同電気湯沸かし器の動作を示すフローチャート
【符号の説明】
1 湯沸かし容器
2 加熱手段
3 温度検出手段
4 給水容器
6 制御手段
7 水量検知手段
9 給水手段
20 水なし状態検知手段
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric water heater provided with a water heater container and a water supply container, and more particularly to a water supply / water heater operation.
[0002]
[Prior art]
In recent years, an electric water heater having a water heater container and a water supply container for storing water for automatically supplying water to the water heater container has been proposed in order to prevent the hot water from running out even when the amount of hot water consumed is large.
[0003]
According to this electric water heater, water is supplied from the water supply container when the hot water in the water heater container decreases, and water is supplied to full water every time it is used so as not to run out of hot water.
[0004]
The detection of the absence of water in the water heater container is performed by detecting a sudden increase in temperature with a sensor that detects the absence of water using a water level sensor provided in the water level pipe and a temperature sensor provided at the bottom of the water heater container when heated by a heater. Some detected the absence of water.
[0005]
[Problems to be solved by the invention]
However, in the conventional electric water heater, when the water supply operation and the heating operation are performed at the same time, with the water level sensor, the water level pipe is fogged, the water surface fluctuates, the water surface is not detected due to a malfunction or the like. Had the problem.
[0006]
Similarly, the temperature sensor detects a sudden rise in temperature even though there is water due to the fluctuation of the water temperature due to the mixing of the hot water in the water heater and the water automatically supplied from the water supply container. In other words, there was a problem of misdetecting the absence of water.
[0007]
The present invention solves the above-mentioned conventional problems, prevents erroneous detection of the water-free state of the water heater container, shortens the water heater time by performing the heating operation even during the water supply operation, and realizes a safe and easy-to-use electric water heater. The purpose is to do.
[0008]
[Means for Solving the Problems]
In order to solve the above-described conventional problems, an electric water heater of the present invention includes a water heater container that heats and retains hot water, a heating means that heats the water heater container, and a water amount detection means that detects the amount of water in the water heater container. An electric water heater comprising a water supply container for containing water and water supply means for supplying water from the water supply container to the water heater container, and when the water supply means is operated, the heating means is stopped or the heating amount is reduced. When the water amount detection means detects the first water amount, the heating means is driven or the heating amount is increased, and when the second water amount larger than the first water amount is detected, the water supply means is stopped and the temperature detection means is provided. In the period during which the water supply means operates, the temperature detection means does not detect the water-free state of the kettle container .
[0009]
With this configuration, it is possible to prevent erroneous detection of the water-free state of the water heater container, to perform the heating operation even during the water supply operation, and to shorten the water heater time. Furthermore, it is possible to prevent erroneous detection of a water condition.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The invention described in claim 1 includes a water heater container that boils hot water, a heating means that heats the water heater container, a water amount detection means that detects the amount of water in the water heater container, and a water supply container that contains water. An electric water heater provided with water supply means for supplying water from the water supply container to the water heater container, and when the water supply means is operated, the heating means is stopped or the heating amount is reduced; When the amount of water is detected, the heating means is driven or the amount of heating is increased, and when the second amount of water larger than the first amount of water is detected, the water supply means is stopped.
[0011]
With this configuration, it is possible to prevent erroneous detection of the water-free state of the water heater container, to perform the heating operation even during the water supply operation, and to shorten the water heater time. Furthermore, it is possible to prevent erroneous detection of a water condition.
[0012]
The invention described in claim 2 includes a water heater container for boiling water to keep it warm, a heating means for heating the water heater container, a water amount detecting means for detecting the amount of water in the water heater container, and a water supply container for containing water. An electric water heater provided with water supply means for supplying water from the water supply container to the water heater container, and when the water supply means is operated, the heating means is stopped or the heating amount is reduced; When the amount of water is detected, the heating means is driven or the amount of heating is increased, when the second amount of water larger than the first amount of water is detected, the water supply means is stopped, and when the water supply means ends its operation, the temperature detection means the configuration for detecting the waterless state of the kettle container according to preventing erroneous detection of the waterless state of the kettle vessel, it is possible to perform heating operation even during the water supply operation, the hot water kettle It can be shortened between. Furthermore, since the detection of the water condition is made more reliable, the safety can be improved.
[0013]
According to a third aspect of the present invention, there is provided a configuration in which the temperature detection unit starts detecting the water-free state of the water heater container after a predetermined time has elapsed after the water supply unit has finished operating. It is possible to prevent fluctuations in water temperature when hot water and water automatically supplied from a water supply container are mixed.
[0014]
The invention described in claim 4 includes a water heater container for boiling and keeping hot water, a heating means for heating the water heater container, a water amount detecting means for detecting the amount of water in the water heater container, and a water supply container for containing water. An electric water heater provided with water supply means for supplying water from the water supply container to the water heater container, and when the water supply means is operated, the heating means is stopped or the heating amount is reduced; When the amount of water is detected, the heating means is driven or the amount of heating is increased, and when the amount of second water larger than the first amount of water is detected, the water supply means is stopped, and the water supply means and the heating means are operated simultaneously. a switch for prohibiting, from the the release switch to enable the water supply means to end the operation, the configuration for starting the operation of the heating means, without water kettle vessel state Erroneous detection is prevented, it is possible to perform the heating operation, even in the feedwater operation, it is possible to shorten the kettle time. Furthermore, the breaker can be prevented from falling by reducing the power consumption compared with the simultaneous operation, and convenience can be improved.
[0015]
【Example】
(Example 1)
Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an electric water heater in an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a water heater container that boils and keeps the stored liquid, 2 abuts the water heater container 1, and heats the liquid in the water heater container in the same manner as the first heating means that heats the liquid in the water heater container. The 2nd heating means whose electric power output is smaller than the 1st heating means to hold temperature is shown.
[0016]
Reference numeral 3 denotes a temperature detection means for detecting the temperature of the liquid in the water heater container 1 and 5 is a boiling detection means. The temperature increase gradient obtained from the temperature detection means 3 is a predetermined temperature increase gradient ( In this embodiment, since the gradient becomes gentler than 30 seconds / 0.5 ° C., the boiling of the liquid in the kettle 1 is detected.
[0017]
Reference numeral 6 denotes control means, which drives the heating means 2 when the temperature detection means 3 detects a temperature lower than the boiling boundary temperature (about 90 ° C. in this embodiment), and then detects boiling by the boiling detection means 5. The heating unit 2 is stopped.
[0018]
Reference numeral 8 denotes reheating means for forcibly reheating the liquid being kept warm. The control means 6 drives the heating means 2 and then detects boiling by the boiling detection means 5 and stops the heating means 2. It is configured to let you.
[0019]
A hot water discharge means 10 includes a hot water switch 10b, a water level pipe 10h for sending liquid from the bottom of the kettle 1 to the outside, and a pump 10i configured in the water level pipe for sending liquid to the outside.
[0020]
Reference numeral 7 denotes a water amount detecting means, which is composed of a water level pipe 10h, an infrared light emitting element and a light receiving element attached to face the water level pipe 10h. And the water level of a water heater container is detected by detecting the liquid level of the water level pipe | tube 10h where a liquid level becomes the same as the water heater container 1. FIG. 7a is a full water detection installed at the full water position, 7b is a water supply detection installed at a position where the heating means is stopped to prevent the kettle 1 from being baked, and 7c is installed between the full water detection 7a and the water supply detection 7b. Even if it is inclined, it is an intermediate detection that prevents the water-boiled container from being baked and ensures safety.
[0021]
4 is a water supply container for storing water for supplying water to the water heater container, and 9 is a water supply means for supplying water from the water supply container 4 to the water heater container 1 through the water supply pipe 15, and is constituted by a water supply motor 9a.
[0022]
Reference numeral 14 denotes an informing means for displaying and notifying operations such as boiling water and keeping warm.
[0023]
FIG. 2 is a circuit diagram of the electric water heater in the embodiment of the present invention. In FIG. 2, 11 is an AC power source and 12 is a DC power source. The heating means 2 constituting the first heating means and the second heating means includes a first heating element 2a for heating the liquid in the kettle container, and a kettle container having a heating power smaller than that of the first heating element 2a. And a relay contact 2c, 2d connected in series with the AC power source 11, and relay coils 2e, 2f for controlling the relay contact 2c, 2d. A current is passed through the relay coil to close the relay contact.
[0024]
The temperature detecting means 3 generates a divided voltage value by the temperature sensing element 3a for converting the temperature into a resistance value, and the temperature sensing element 3a and the resistance 3b, and converts the voltage into an AD converter 3c for converting it into a binary code. Entered. The AD converter 3c sets a range of about 30 to 120 ° C. in increments of a unit temperature range (about 0.5 ° C. in this embodiment), and outputs a signal every time the unit temperature rises.
[0025]
The reheating means 8 is an input for forcibly reheating the liquid being kept, and is composed of a switch 8a and resistors 8b and 8c.
[0026]
The notification means 14 notifies the end of boiling by the buzzer 14a, the LED 14b displays during boiling, and 14c displays during heat insulation.
[0027]
The hot water discharge means 10 includes a motor 10a for driving an electric pump 10i for sending liquid in a water heater container to the outside, a hot water switch 10b connected in series with the motor 10a, a transistor 10c, and a signal for turning on the transistor 10c. The lock release switch 10e is configured to output.
[0028]
The hot water can be discharged when the unlocking switch 10b is on in the unlocked state in which the lock release switch 10e is turned on and the transistor 10c is turned on. Therefore, in the locked state where the lock release switch 10e is turned off and the transistor 10c is turned off, the hot water cannot be discharged even if the hot water switch 10b is turned on. Further, if the next hot water is not discharged for a certain period of time (10 seconds in this embodiment) from the end of the hot water, the transistor 10c is turned off again so that the hot water cannot be discharged only by turning on the hot water switch 10b.
[0029]
The water amount detection means 7 is composed of an infrared light emitting element and a light receiving element. When full water is detected, the water level detection 7a is turned on, when water supply is detected, the water level detection 7b is turned on, and when intermediate detection is performed, the water level detection 7c is turned on.
[0030]
The water supply means 9 includes a water supply motor 9a and a transistor 9b. When the water in the water supply container 4 is supplied to the water heater container 1, the water supply motor 9a is driven by turning on the transistor 9b.
[0031]
Reference numeral 13 denotes a microcomputer (hereinafter abbreviated as a microcomputer) that executes a program, thereby realizing the operations of the boiling detection means 5, the control means 6, and water supply / boiling water.
[0032]
FIG. 3 is a flowchart showing the water supply / water heater operation of the program stored in the microcomputer 13 in the embodiment of the present invention. Hereinafter, this operation will be described.
[0033]
First, when the amount of water detected by the water amount detection means 9 is 100b, the control means 6 at 100 turns off the heating means 2 at 101, turns on the water supply motor 9a at 102 and starts water supply. When the water level reaches the intermediate detection 7c at 103, the heating means 2 is turned on at 104 and heating is started. When the water level further rises and reaches the full water detection 7a at 105, the water supply motor 9a is turned off and the water supply operation is terminated.
[0034]
After that, the supplied water keeps heating means 2 heated until boiling is detected by temperature detecting means 3. When boiling is detected at 107, heating means 2 is turned off at 108. After that, keep warming. From this state, the hot water in the kettle 1 is used as appropriate, and the water level decreases. When the hot water is discharged and the water level becomes the water supply detection 7b, the water supply is started again after the hot water is finished.
[0035]
In this embodiment, when the water supply motor 9a is on, the heating means 2 can be repeatedly turned on and off to reduce the amount of heating so that the water heater 1 is not empty. In this case, safety is further improved.
[0036]
As described above, in this embodiment, even if the main body is tilted, the water-boiled container is prevented from being baked, and the heating operation is performed from the amount of water that can ensure safety. Can be improved. Furthermore, since the heating operation can be performed even during the water supply operation, the time for boiling the water can be shortened.
[0037]
In the present embodiment, the water level position of the water amount detection means 7 is set to three points of the full water detection 7a, the water supply detection 7b, and the intermediate detection 7c, but the water level position may be set to two points of the full water detection 7a and the water supply detection 7b. . In this case, while the water supply motor 9a is operating, the heating means is not turned on until the water amount detecting means 7 detects the full water 7a.
[0038]
Further, the intermediate detection 7c of the water amount detection means 7 may be realized by a timer of time measuring means. As a result, it is possible to prevent erroneous detection of the waterless state of the kettle container at low cost.
[0039]
In this embodiment, water is supplied from the water supply container 4 to the water heater 1 using the water supply motor 9a. However, when the water supply container 4 is installed at a position higher than the water heater 1 A water supply valve or the like may be used.
[0040]
(Example 2)
Embodiment 2 of the present invention will be described below. FIG. 4 is a block diagram of an electric water heater in Embodiment 2 of the present invention. Since the basic configuration of the present embodiment is substantially the same as that of the first embodiment, the description thereof will be omitted and the description will focus on the differences. The same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
[0041]
In FIG. 4, reference numeral 20 denotes a waterless state detection means, and the temperature increase gradient obtained from the temperature detection means 3 is higher than a predetermined temperature increase gradient (in this embodiment, 0.5 sec / 0.5 ° C.). As a result of the rapidity of the water, the water-free state in the kettle 1 is detected.
[0042]
Reference numeral 21 denotes an operation state display means such as an LCD or LED, which displays the operation states of the water supply means and the heating means. A switch 22 prohibits simultaneous operation of the water supply means and the heating means.
[0043]
FIG. 5 is a flowchart showing the water supply / water heater operation of the program stored in the microcomputer 13 in the second embodiment of the present invention. Hereinafter, this operation will be described.
[0044]
First, at 200, the control means 6 turns off the heating means 2 at 201 when the amount of water detected by the water amount detection means 9 is 7b. When the heating means 2 is turned off, detection of the no water state by the no water state detecting means is stopped at 202. In 203, the water supply motor 9a is turned on to start water supply. When the water level reaches the intermediate detection 7c at 204, the heating means 2 is turned on at 205 and heating is started. When the water level continues to rise and reaches the full water detection 7a at 206, the water supply motor 9a is turned off and the water supply operation is terminated.
[0045]
Thereafter, the heating means 2 is turned off at 208, and a predetermined time (in this embodiment, the heater power is 700 W and the water temperature in the kettle is 1.5 liters is set to 20 seconds) is waited for 210 after the heating means 2 is turned off at 209. Then, the heating means 2 is turned on and reheating is performed. At this time, in 211, detection of a waterless state by the waterless state detecting means is started.
[0046]
Then, the heating means 2 is heated until boiling is detected. When boiling is detected at 212, the heating means 2 is turned off at 213. After that, keep warming.
[0047]
In the present embodiment, the operation status display means 21 displays the operation status of the water supply motor 9a and the heating means 2 during the operation of water supply / water heater. Can be improved.
[0048]
When the switch 22 is turned on, the water supply motor 9a and the heating means 2 are prohibited from operating simultaneously. That is, the operation of the heating means 2 is started after the operation of the water supply motor 9a. Thereby, it is possible to prevent the breaker from falling by reducing the power consumption compared with the simultaneous operation, and the convenience can be improved.
[0049]
As described above, in the present embodiment, the detection of the water-free state of the kettle by the temperature detection means is not detected during the period when the water supply means is operating, and is detected while the water supply means is stopped. Since the detection of the presence of water is made more reliable, safety can be improved. Moreover, the influence of the fluctuation of the water temperature at the end of the water supply operation can be prevented. Furthermore, since the heating operation can be performed even during the water supply operation, the time for boiling the water can be shortened.
[0050]
【The invention's effect】
As described above, according to the first to fourth aspects of the present invention, it is possible to prevent erroneous detection of the water-free state of the kettle container, shorten the kettle time by performing the heating operation even during the water supply operation, and be safe and easy to use. A good electric water heater can be realized.
[Brief description of the drawings]
FIG. 1 is a block diagram of an electric water heater in Embodiment 1 of the present invention. FIG. 2 is a circuit diagram of the electric water heater. FIG. 3 is a flowchart showing the operation of the electric water heater. Block diagram of water heater [Fig. 5] Flow chart showing the operation of the electric water heater [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Water heater 2 Heating means 3 Temperature detection means 4 Water supply container 6 Control means 7 Water quantity detection means 9 Water supply means 20 No water state detection means

Claims (4)

湯を沸かして保温する湯沸かし容器と、前記湯沸かし容器を加熱する加熱手段と、前記湯沸かし容器内の水量を検知する水量検知手段と、水を収容する給水容器と、前記給水容器の水を前記湯沸かし容器に給水する給水手段とを備えた電気湯沸かし器であって、前記給水手段が動作すると前記加熱手段を停止または加熱量を減少させ、前記水量検知手段が第1の水量を検知すると前記加熱手段を駆動または加熱量を増加させ、第1の水量より多い第2の水量を検知すると前記給水手段を停止し、温度検知手段を有し、前記給水手段が動作する期間は、前記温度検出手段による前記湯沸かし容器の水なし状態の検出を行わないことを特徴とする電気湯沸かし器。 A water heater container that boils and retains water, a heating means that heats the water heater container, a water amount detection means that detects the amount of water in the water heater container, a water supply container that contains water, and the water in the water supply container An electric water heater provided with water supply means for supplying water to the container, wherein when the water supply means is operated, the heating means is stopped or the heating amount is reduced, and when the water amount detection means detects the first water amount, the heating means is When the driving or heating amount is increased and the second water amount larger than the first water amount is detected, the water supply means is stopped, the temperature detection means is provided, and the period during which the water supply means operates is determined by the temperature detection means. An electric water heater characterized by not detecting the absence of water in a water heater container. 湯を沸かして保温する湯沸かし容器と、前記湯沸かし容器を加熱する加熱手段と、前記湯沸かし容器内の水量を検知する水量検知手段と、水を収容する給水容器と、前記給水容器の水を前記湯沸かし容器に給水する給水手段とを備えた電気湯沸かし器であって、前記給水手段が動作すると前記加熱手段を停止または加熱量を減少させ、前記水量検知手段が第1の水量を検知すると前記加熱手段を駆動または加熱量を増加させ、第1の水量より多い第2の水量を検知すると前記給水手段を停止し、前記給水手段が動作を終了すると、前記温度検出手段による前記湯沸かし容器の水なし状態の検出を行うことを特徴とする電気湯沸かし器。 A water heater container that boils and retains water, a heating means that heats the water heater container, a water amount detection means that detects the amount of water in the water heater container, a water supply container that contains water, and the water in the water supply container An electric water heater provided with water supply means for supplying water to the container, wherein when the water supply means is operated, the heating means is stopped or the heating amount is reduced, and when the water amount detection means detects the first water amount, the heating means is When the driving or heating amount is increased and a second water amount greater than the first water amount is detected, the water supply means is stopped, and when the water supply means has finished its operation, the temperature detecting means is in a state where there is no water in the kettle container. An electric water heater characterized by performing detection. 前記温度検出手段による前記湯沸かし容器の水なし状態の検出を開始するタイミングを、前記給水手段が動作を終了してから所定時間経過後に行うことを特徴とする請求項に記載の電気湯沸かし器。 3. The electric water heater according to claim 2 , wherein the timing at which the temperature detection unit starts detecting the state of no water in the water heater container is performed after a predetermined time has elapsed since the operation of the water supply unit. 湯を沸かして保温する湯沸かし容器と、前記湯沸かし容器を加熱する加熱手段と、前記湯沸かし容器内の水量を検知する水量検知手段と、水を収容する給水容器と、前記給水容器の水を前記湯沸かし容器に給水する給水手段とを備えた電気湯沸かし器であって、前記給水手段が動作すると前記加熱手段を停止または加熱量を減少させ、前記水量検知手段が第1の水量を検知すると前記加熱手段を駆動または加熱量を増加させ、第1の水量より多い第2の水量を検知すると前記給水手段を停止し、前記給水手段と前記加熱手段が同時動作するのを禁止するスイッチを有し、前記スイッチを有効にすると前記給水手段が動作を終了してから、前記加熱手段の動作を開始することを特徴とする記載の電気湯沸かし器。 A water heater container that boils and retains water, a heating means that heats the water heater container, a water amount detection means that detects the amount of water in the water heater container, a water supply container that contains water, and the water in the water supply container An electric water heater provided with water supply means for supplying water to the container, wherein when the water supply means is operated, the heating means is stopped or the heating amount is reduced, and when the water amount detection means detects the first water amount, the heating means is A switch for stopping the water supply means when detecting a second water amount greater than the first water amount by increasing the driving or heating amount , and prohibiting simultaneous operation of the water supply means and the heating means; Exit from the water supply means operate to enable electrical water heater, wherein the starting the operation of the heating means.
JP2002225799A 2002-08-02 2002-08-02 Electric water heater Expired - Fee Related JP3656621B2 (en)

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