JP3599026B2

JP3599026B2 - Water heater

Info

Publication number: JP3599026B2
Application number: JP2002012522A
Authority: JP
Inventors: 敏克前田; 高弓福田; 裕展田中
Original assignee: Panasonic Corp; Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Corp; Panasonic Holdings Corp
Priority date: 2002-01-22
Filing date: 2002-01-22
Publication date: 2004-12-08
Anticipated expiration: 2022-01-22
Also published as: JP2003214709A

Description

【０００１】
【発明の属する技術分野】
本発明は、一般家庭におけるキッチンシステムへ組み込んで使用するビルトインタイプの給湯装置に関するものである。
【０００２】
【従来の技術】
従来のビルトインタイプの給湯装置は、加熱容器内の貯湯量が第１の所定量未満となると、加熱容器内に給水を行い、第１の所定量より多い第２の所定量になると、給水を停止するという単純な構成であった。
【０００３】
【発明が解決しようとする課題】
しかしながら、上記従来のような構成では、出湯中にも拘わらず、第１の所定量未満となると、加熱容器内に水を給水するので、出湯中の水温が低くなることがあった。
【０００４】
本発明は、上記従来の課題を解決するもので、出湯中には、加熱容器の貯湯量が第１の所定量未満となっても加熱容器内への水の給水を行わないようにして、出湯中の水の温度を下げないことを目的とする。
【０００５】
【課題を解決するための手段】
上記目的を達成するために、本発明の給湯装置は、出湯中においては、加熱容器の貯湯量が第１の所定量未満となっても加熱容器内への水の給水を行わない構成としたものである。
【０００６】
【発明の実施の形態】
請求項１に記載の発明は、水を加熱する加熱手段を有する加熱容器と、前記加熱容器への給水を制御する給水弁と、前記加熱容器内の水を吐出するポンプと、前記加熱容器内の貯湯量が所定量未満を検知すると給水弁が駆動する湯量検知手段と、前記加熱手段及び前記給水弁を制御する制御手段とを備え、前記制御手段は、前記ポンプが駆動している時には、前記給水弁を駆動させない給湯装置である。
【０００７】
この構成によれば、ポンプ駆動による出湯時に、加熱容器内の貯湯量が所定量未満となっても加熱容器内への水の給水を行わないので、出湯時の水温を下げることがない。
【０００８】
請求項２に記載の発明は、水を加熱する加熱手段を有する加熱容器と、前記加熱容器への給水を制御する給水弁と、前記加熱容器内の水を吐出するポンプと、前記加熱容器内の貯湯量が所定量未満を検知すると給水弁が駆動する湯量検知手段と、前記加熱手段及び前記給水弁を制御する制御手段とを備え、前記制御手段は、前記ポンプが駆動可能な時には、前記給水弁を駆動させない給湯装置である。
【０００９】
この構成によれば、ポンプ駆動可能な時に、加熱容器内の貯湯量が所定量未満となっても加熱容器内への水の給水を行わないので、短い時間の断続的な出湯時においても、出湯時の水温を下げることがない。
【００１０】
請求項３に記載の発明は、水を加熱する加熱手段を有する加熱容器と、前記加熱容器への給水を制御する給水弁と、前記加熱容器内の水を吐出するポンプと、前記加熱容器内の貯湯量が所定量未満を検知すると給水弁が駆動する湯量検知手段と、前記加熱手段及び前記給水弁を制御する制御手段とを備え、前記制御手段は、前記ポンプが停止してから所定時間の間は、前記給水弁を駆動させない給湯装置である。
【００１１】
この構成によれば、ポンプ駆動可能な時に、加熱容器内の貯湯量が所定量未満となっても加熱容器内への水の給水を行わないので、長い時間の断続的な出湯時においても、出湯時の水温を下げることがない。
【００１２】
請求項４に記載の発明は、水を加熱する加熱手段を有する加熱容器と、前記加熱容器への給水を制御する給水弁と、前記加熱容器内の水を吐出するポンプと、前記加熱容器内の貯湯量を検知する湯量検知手段と、前記加熱容器内の水の温度を検知する水温検知手段と、前記加熱手段及び前記給水弁を制御する制御手段とを備え、前記制御手段は、前記加熱手段を加熱中に前記水温検知手段の検知温度が所定温度あるいは、所定勾配となった時に繰り返し前記加熱容器への水を給水する給水湯沸かしモードと、保温動作を行う保温モードとを有し、前記給水湯沸かしモード中に前記湯量検知手段が第１の所定湯量を検知すると前記保温モードに移行し、前記保温モード中に前記湯量検知手段が前記第１の所定貯湯量より少ない第２の所定貯湯量を検知すると前記給水湯沸かしモードに移行するとともに、前記保温モード中に前記ポンプが駆動しているときには、前記給水湯沸かしモードに移行しない給湯装置である。
【００１３】
この構成によれば、保温モード中のポンプ駆動による出湯中は、加熱容器内の貯湯量が所定量未満となっても給水湯沸かしモードに移行しないので、加熱容器内への水の給水は行わない。よって、出湯時の水温を下げることがない。また、給水湯沸かしモード中では、温度検知手段の検知温度が所定温度あるいは所定勾配となった時には、加熱容器内への水の給水を行うので水の給水を止めることによる加熱容器内の水の連続沸騰や主ヒータ停止による主ヒータオンオフ回数を増やさなくてすむ。
【００１４】
請求項５に記載の発明は、水を加熱する加熱手段を有する加熱容器と、前記加熱容器への給水を制御する給水弁と、前記加熱容器内の水を吐出するポンプと、前記加熱容器内の貯湯量を検知する湯量検知手段と、前記加熱容器内の水の温度を検知する水温検知手段と、前記加熱手段及び前記給水弁を制御する制御手段とを備え、前記制御手段は、前記加熱手段を加熱中に前記水温検知手段の検知温度が所定温度あるいは、所定勾配となった時に繰り返し前記加熱容器への水を給水する給水湯沸かしモードと、保温動作を行う保温モードとを有し、前記給水湯沸かしモード中に前記湯量検知手段が第１の所定湯量を検知すると前記保温モードに移行し、前記保温モード中に前記湯量検知手段が前記第１の所定貯湯量より少ない第２の所定貯湯量を検知すると前記給水湯沸かしモードに移行するとともに、前記保温モード中に前記ポンプが駆動可能な時には、前記給水湯沸かしモードに移行しない給湯装置である。
【００１５】
この構成によれば、保温モード中のポンプ駆動可能中は、加熱容器内の貯湯量が所定量未満となっても給水湯沸かしモードに移行しないので、短い時間の断続的な出湯時においても、加熱容器内への水の給水は行わない。よって、出湯時の水温を下げることがない。また、給水湯沸かしモード中では、温度検知手段の検知温度が所定温度あるいは所定勾配となった時には、加熱容器内への水の給水を行うので水の給水を止めることによる加熱容器内の水の連続沸騰や主ヒータ停止による主ヒータのオンオフ回数を増やさなくてすむ。
【００１６】
請求項６記載の発明は、水を加熱する加熱手段を有する加熱容器と、前記加熱容器への給水を制御する給水弁と、前記加熱容器内の水を吐出するポンプと、前記加熱容器内の貯湯量を検知する湯量検知手段と、前記加熱容器内の水の温度を検知する水温検知手段と、前記加熱手段及び前記給水弁を制御する制御手段とを備え、前記制御手段は、前記加熱手段を加熱中に前記水温検知手段の検知温度が所定温度あるいは、所定勾配となった時に繰り返し前記加熱容器への水を給水する給水湯沸かしモードと、保温動作を行う保温モードとを有し、前記給水湯沸かしモード中に前記湯量検知手段が第１の所定湯量を検知すると前記保温モードに移行し、前記保温モード中に前記湯量検知手段が前記第１の所定貯湯量より少ない第２の所定貯湯量を検知すると前記給水湯沸かしモードに移行するとともに、前記保温モード中に前記ポンプが停止してから所定時間の間は、前記給水湯沸かしモードに移行しない給湯装置である。
【００１７】
この構成によれば、保温モード中のポンプが停止してから所定時間の間は、加熱容器内の貯湯量が所定量未満となっても給水湯沸かしモードに移行しないので、長い時間の断続的な出湯時においても、加熱容器内への水の給水は行わない。よって、出湯時の水温を下げることがない。また、給水湯沸かしモード中では、温度検知手段の検知温度が所定温度あるいは所定勾配となった時には、加熱容器内への水の給水は行うので水の給水を止めることによる加熱容器内の水の連続沸騰や主ヒータ停止による主ヒータオンオフ回数を増やさなくてすむ。
【００１８】
請求項７記載の発明は、水を加熱する加熱手段を有する加熱容器と、前記加熱容器への給水を制御する給水弁と、前記加熱容器内の水を吐出するポンプと、前記加熱容器内の貯湯量を検知する湯量検知手段と、前記加熱容器内の水の温度を検知する水温検知手段と、前記加熱容器内の蒸気を検知する蒸気検知手段と、前記加熱手段及び前記給水弁を制御する制御手段とを備え、前記制御手段は、前記加熱手段を加熱中に前記蒸気検知手段が蒸気を検知した時に繰り返し前記加熱容器への水を給水する給水湯沸かしモードと、保温動作を行う保温モードとを有し、前記給水湯沸かしモード中に前記湯量検知手段が第１の所定湯量を検知すると前記保温モードに移行し、前記保温モード中に前記湯量検知手段が前記第１の所定貯湯量より少ない第２の所定貯湯量を検知すると前記給水湯沸かしモードに移行するとともに、前記保温モード中に前記ポンプが駆動しているときには、前記給水湯沸かしモードに移行しない給湯装置である。
【００１９】
この構成によれば、保温モード中のポンプ駆動による出湯中は、加熱容器内の貯湯量が所定量未満となっても給水湯沸かしモードに移行しないので、加熱容器内への水の給水は行わない。よって、出湯時の水温を下げることがない。また、給水湯沸かしモード中では、蒸気検知手段が蒸気を検知した時には、加熱容器内への水の給水は行うので水の給水を止めることによる加熱容器内の水の連続沸騰や主ヒータ停止による主ヒータオンオフ回数を増やさなくてすむ。
【００２０】
請求項８記載の発明は、水を加熱する加熱手段を有する加熱容器と、前記加熱容器への給水を制御する給水弁と、前記加熱容器内の水を吐出するポンプと、前記加熱容器内の貯湯量を検知する湯量検知手段と、前記加熱容器内の水の温度を検知する水温検知手段と、前記加熱容器内の蒸気を検知する蒸気検知手段と、前記加熱手段及び前記給水弁を制御する制御手段とを備え、前記制御手段は、前記加熱手段を加熱中に前記蒸気検知手段が蒸気を検知した時に繰り返し前記加熱容器への水を給水する給水湯沸かしモードと、保温動作を行う保温モードとを有し、前記給水湯沸かしモード中に前記湯量検知手段が第１の所定湯量を検知すると前記保温モードに移行し、前記保温モード中に前記湯量検知手段が前記第１の所定貯湯量より少ない第２の所定貯湯量を検知すると前記給水湯沸かしモードに移行するとともに、前記保温モード中に前記ポンプが駆動可能な時には、前記給水湯沸かしモードに移行しない給湯装置である。
【００２１】
この構成によれば、保温モード中のポンプ駆動可能な時に、加熱容器内の貯湯量が所定量未満となっても給水湯沸かしモードに移行しないので、短い時間の断続的な出湯時においても、加熱容器内への水の給水は行わない。よって、出湯時の水温を下げることがない。また、給水湯沸かしモード中では、蒸気検知手段が蒸気を検知した時には、加熱容器内への水の給水は行うので水の給水を止めることによる加熱容器内の水の連続沸騰や主ヒータ停止による主ヒータオンオフ回数を増やさなくてすむ。
【００２２】
請求項９記載の発明は、水を加熱する加熱手段を有する加熱容器と、前記加熱容器への給水を制御する給水弁と、前記加熱容器内の水を吐出するポンプと、前記加熱容器内の貯湯量を検知する湯量検知手段と、前記加熱容器内の水の温度を検知する水温検知手段と、前記加熱手段及び前記給水弁を制御する制御手段とを備え、前記制御手段は、前記加熱手段を加熱中に前記水温検知手段の検知温度が所定温度あるいは、所定温度勾配となった時に繰り返し前記加熱容器への水を給水する給水湯沸かしモードと、保温動作を行う保温モードとを有し、前記給水湯沸かしモード中に前記湯量検知手段が第１の所定湯量を検知すると前記保温モードに移行し、前記保温モード中に前記湯量検知手段が前記第１の所定貯湯量より少ない第２の所定貯湯量を検知すると前記給水湯沸かしモードに移行するとともに、前記保温モード中に前記ポンプが停止してから所定時間の間は、前記給水湯沸かしモードに移行しない給湯装置である。
【００２３】
この構成によれば、保温モード中のポンプ停止してから所定時間の間は、加熱容器内の貯湯量が所定量未満となっても給水湯沸かしモードに移行しないので、長い時間の断続的な出湯時においても、加熱容器内への水の給水は行わない。よって、出湯時の水温を下げることがない。また、給水湯沸かしモード中では、蒸気検知手段が蒸気を検知した時には、加熱容器内への水の給水は行うので水の給水を止めることによる加熱容器内の水の連続沸騰や主ヒータ停止による主ヒータオンオフ回数を増やさなくてすむ。
【００２４】
【実施例】
以下、本発明の実施例について図面を参照しながら説明する。
【００２５】
（実施例１）
以下、本発明の実施例１について図１〜図３を基に説明する。図１において、１は水道管で、２は分岐栓で、３は止水栓である。４はキッチンユニット５内部に収めれらた給湯装置の加熱ユニットで、内部に水を入れる加熱容器６がある。
【００２６】
水道管１から分岐栓２により分岐した接続管７は、給水弁８を介して浄水カートリッジ９の入り口に取り付けられている。浄水カートリッジ９の出口には、切替弁１０が接続されている。切替弁１０の一方（切替弁がオンしている時）は、加熱容器６の上部に接続されている。加熱容器６の底部には水を加熱する主ヒータ１１と、加熱した水を保温する補助ヒータ１２と、加熱容器６の水温を検出するサーミスタ１３とが取り付けられている。
【００２７】
また、加熱容器６の湯の出口部には、内部の湯をキッチンユニット５上部に吐出させるポンプ１４が取り付けられている。さらに、加熱容器６内には、水位を検知するための水位電極１５が取り付けられている。この電極１５は、加熱容器６の貯湯量が０．３リットル、０．６リットル、０．９リットル、１．２リットル、１．５リットル、１．８リットルでそれぞれ検知できるように水位電極が取り付けられている。本実施例では、加熱容器６の満水量を１．８リットルとしている。１６は、加熱容器６内への給水した水を貯めてゆっくりと加熱容器６内へ水を補充する給水バッファである。
【００２８】
１７はキッチンユニット５の上部に設けられた水栓で、加熱容器６内の湯を導水する湯パイプ１８と、切替弁１０により分岐したもう一方（切替弁がオフしている時）の水パイプ１９と、加熱容器６上部に連通した蒸気パイプ２０とを収納している。そしてこれらの各パイプ１８〜２０および水道栓１ａは、キッチンシンク５ａに臨んで位置している。２１は表示操作部で，水栓１７上部の外面に設けられている。２３はサーミスタ１３及び水位電極１５、表示操作部２１の入力に基づき、給水弁８及び切替弁１０、主ヒータ１１、補助ヒータ１２、ポンプ１４、表示操作部２１を制御するマイクロコンピュータを含む制御手段である。
【００２９】
図２は本実施例の表示操作部２１を示しており、浄水ボタンスイッチ２１ａを押すと給水弁８がオンする。給水弁８がオンすると、水道管１からの水は、浄水カートリッジ９を通過して、切替弁１０がオフとなっているので水パイプ１９を通過して出水する。もう一度、浄水ボタンスイッチ２１ａを押すと、給水弁８がオフして、水パイプ１９からの出水は止まる。
【００３０】
ロック解除ボタンスイッチ２１ｂを押すと、ロック解除ＬＥＤ２１ｃが点灯して出湯可能状態になる。ロック解除ボタンスイッチ２１ｂを押してから１０秒以内に出湯ボタンスイッチ２１ｄを押し続けると、出湯ボタンスイッチ２１ｄを押している間のみ、ポンプ１４が駆動して、加熱容器６内の水を湯パイプ１８から出湯する。押し続けている出湯ボタンスイッチ２１ｄから手を離すと、ポンプ１４がオフして湯バイプ１８からの出湯は止まる。１０秒に、ロック解除ＬＥＤ２１ｃが消灯して、出湯不可能状態となる。また、湯量１のＬＥＤ２１ｅ、湯量２のＬＥＤ２１ｆ、湯量３のＬＥＤ２１ｇは、水位電極１５によって検知した加熱容器６内の貯湯量に応じて変化する。加熱容器６内の貯湯量が０．６リットル未満の場合には、湯量１のＬＥＤ２１ｅが点灯表示する。また、加熱容器６内の貯湯量が０．６リットル以上１．２リットル未満の場合には、湯量１のＬＥＤ２１ｅと湯量２のＬＥＤ２１ｆが点灯表示する。加熱容器６内の貯湯量が１．２リットル以上の場合には、湯量１のＬＥＤ２１ｅ、湯量２のＬＥＤ２１ｆ、湯量３のＬＥＤ２１ｇが点灯表示する。
【００３１】
図３はポンプ回りの電器回路図を示しており、ロック解除ボタンスイッチ２１ｄを押すとロック解除ＬＥＤ２１ｃが点灯表示に切り替わるとともにＮＰＮトランジスタがオンして、ポンプ１４がいつでも駆動できる状態になる。その後、出湯ボタンスイッチ２１ｄを押している間のみ、ポンプ１４が駆動して、加熱容器６内の水を湯パイプ１８より吐出する。このように、出湯ボタンスイッチ２１ｄの構成をこのようなトランジスタ駆動とスイッチとの直接駆動にすることで、マイクロコンピュータの暴走による自然出湯を避けることができる。
【００３２】
上記した実施例における実際の動作について、図１〜図３を参照しながら説明する。電源スイッチをオンすると、切替弁１０がオンした後、給水弁８がオンする。すると水は、水道管１から浄水カートリッジ９を通過した後、切替弁１０によって加熱容器６に貯水していく。水位電極１５により貯水量が０．３リットルに達すると、給水弁８と切替弁１０をオフして加熱容器６内への貯水は止まる。その後、主ヒータ１１と補助ヒータ１２をオンして、加熱容器６内の水を加熱する（この動作のモードを初回湯沸かしモードと呼ぶ）。また、この初回湯沸かしモード中には、出湯動作は行えない。サーミスタ１３の検知温度が９５℃以上に達すると、再度、切替弁１０と給水弁８を５秒間駆動して、加熱容器６内に少量の水を給水する。サーミスタ１３の検知温度が下がり、その後サーミスタ１３の検知温度が９３℃以上に達すると、再度、切替弁１０と給水弁８を５秒間駆動して、加熱容器６内に少量の水を給水する。水位電極１５の検知貯水量が１．８リットルに達すまでこれらの動作を繰り返す（この動作のモードを給水湯沸かしモードと呼ぶ）。その後、主ヒータ１１と補助ヒータ１２をオフして、サーミスタ１３の検知温度が９２℃未満となると、補助ヒータ１２をオンして加熱容器６内のお湯を高温保温するようになっている（この動作を保温モードと呼ぶ）。
【００３３】
保温モードからロック解除ボタンスイッチ２１ｂを押して、出湯可能状態にしてから、出湯ボタンスイッチ２１ｄを押して出湯を行い、水位電極１５によって検知した加熱容器６内の貯湯量が０リットルを検知するまで、加熱容器６内への給水を行わない。加熱容器６内の貯湯量が０リットルを検知すると、出湯不可能状態に戻り、初回湯沸かしモードに移行する。また、出湯停止後、加熱容器６内の貯湯量が１．２リットル未満を検知すると、給水湯沸かしモードに移行して、主ヒータ１１と補助ヒータ１２を駆動して、給水湯沸かしモードに移行する。
【００３４】
次に、給水湯沸かしモードからロック解除ボタンスイッチ２１ｂを押して、出湯可能状態にしてから、出湯ボタンスイッチ２１ｄを押して出湯を行っている間は、サーミスタ１３の検知温度が９３℃以上に達しても、加熱容器６内への給水を行わず、主ヒータ１１をオフして、加熱容器６内の水の連続沸騰を防止する。その後、水位電極１５によって検知した加熱容器６内の貯湯量が０リットルを検知すると、出湯不可能状態に戻り、初回湯沸かしモードに移行する。
【００３５】
このように出湯中の加熱容器６内への水の給水動作を停止することで、出湯時の水温の低下を抑えることができる。また、給水湯沸かしモード中では、主ヒータ１１を停止することで、加熱容器６内の水の連続沸騰をさけることもできる。ここで、加熱容器６内の水の連続沸騰が起こると、ポンプ１４のスクリュー部分に水蒸気の泡がからみ、出湯量が低下する現象（キャビテーション）が発生する。
【００３６】
（実施例２）
以下、本発明の実施例２について図１〜３を参照しながら説明する。図において実施例１と同一の構成要素については同じ符号を付し説明を省略する。
【００３７】
上記した実施例における実際の動作について、図１〜図３を参照しながら説明する。電源スイッチをオンすると、切替弁１０がオンした後、給水弁８がオンする。すると水は、水道管１から浄水カートリッジ９を通過した後、切替弁１０によって加熱容器６に貯水していく。水位電極１５により貯水量が０．３リットルに達すると、給水弁８と切替弁１０をオフして加熱容器６内への貯水は止まる。その後、主ヒータ１１と補助ヒータ１２をオンして、加熱容器６内の水を加熱する（この動作のモードを初回湯沸かしモードと呼ぶ）。また、この初回湯沸かしモード中には、出湯動作は行えない。
【００３８】
サーミスタ１３の検知温度勾配が１℃上昇に３０秒以上必要となったときに、再度、切替弁１０と給水弁８を５秒間駆動して、加熱容器６内に少量の水を給水する。サーミスタ１３の検知温度が下がり、その１分後にサーミスタ１３の検知温度勾配が同じく１℃上昇に３０秒以上必要となると、再度、切替弁１０と給水弁８を５秒間駆動して、加熱容器６内に少量の水を給水する。水位電極１５の検知貯水量が１．８リットルに達すまでこれらの動作を繰り返す（この動作のモードを給水湯沸かしモードと呼ぶ）。
【００３９】
その後、主ヒータ１１と補助ヒータ１２をオフして、サーミスタ１３の検知温度が９２℃未満となると、補助ヒータ１２をオンして加熱容器６内のお湯を高温保温するようになっている（この動作を保温モードと呼ぶ）。
【００４０】
保温モードからロック解除ボタンスイッチ２１ｂを押して、出湯可能状態にしている間は、水位電極１５によって検知した加熱容器６内の貯湯量が０リットルを検知するまで、加熱容器６内への給水を行わない。加熱容器６内の貯湯量が０リットルを検知すると、出湯不可能状態に戻り、初回湯沸かしモードに移行する。また、出湯不可能状態に戻り、加熱容器６内の貯湯量が１．２リットル未満を検知すると、給水湯沸かしモードに移行して、主ヒータ１１と補助ヒータ１２を駆動して、給水湯沸かしモードに移行する。
【００４１】
次に、給水湯沸かしモードからロック解除ボタンスイッチ２１ｂを押して、出湯可能状態になっている間は、サーミスタ１３の検知温度勾配が同じく１℃上昇に３０秒以上必要となっても、加熱容器６内への給水を行わず、主ヒータ１１をオフして、加熱容器６内の水の連続沸騰を防止する。その後、水位電極１５によって検知した加熱容器６内の貯湯量が０リットルを検知すると、出湯不可能状態に戻り、初回湯沸かしモードに移行する。
【００４２】
このように出湯可能状態の間、加熱容器６内への水の給水動作を停止することで、出湯時の水温の低下を抑えることができる。また、出湯が短い時間に何回か繰り返されても、出湯可能状態である限りでは、加熱容器６内への給水は行われないので、その間の出湯時の水温を下げることはない。また、給水湯沸かしモード中では、主ヒータ１１を停止することで、加熱容器６内の水の連続沸騰をさけることもできる。
【００４３】
（実施例３）
以下、本発明の実施例３について図２〜図４を参照しながら説明する。図４において実施例１と同一の構成要素については同じ符号を付し説明を省略する。図４の２４は、加熱容器６内の蒸気を検知する第２のサーミスタ２４である。
【００４４】
上記した実施例における実際の動作について、図２〜図４を参照しながら説明する。電源スイッチをオンすると、切替弁１０がオンした後、給水弁８がオンする。すると水は、水道管１から浄水カートリッジ９を通過した後、切替弁１０によって加熱容器６に貯水していく。水位電極１５により貯水量が０．３リットルに達すると、給水弁８と切替弁１０をオフして加熱容器６内への貯水は止まる。その後、主ヒータ１１と補助ヒータ１２をオンして、加熱容器６内の水を加熱する（この動作のモードを初回湯沸かしモードと呼ぶ）。また、この初回湯沸かしモード中には、出湯動作は行えない。
【００４５】
第２のサーミスタ２４の検知温度勾配が１℃上昇が２秒未満となったときに、再度、切替弁１０と給水弁８を５秒間駆動して、加熱容器６内に少量の水を給水する。第２のサーミスタ２４の検知温度が下がり、その１分後に第２のサーミスタ２４の検知温度勾配が同じく１℃上昇が２秒未満となると、再度、切替弁１０と給水弁８を５秒間駆動して、加熱容器６内に少量の水を給水する。水位電極１５の検知貯水量が１．８リットルに達すまでこれらの動作を繰り返す（この動作のモードを給水湯沸かしモードと呼ぶ）。
【００４６】
その後、主ヒータ１１と補助ヒータ１２をオフして、第１のサーミスタ１３の検知温度が９２℃未満となると、補助ヒータ１２をオンして加熱容器６内のお湯を高温保温するようになっている（この動作を保温モードと呼ぶ）。
【００４７】
保温モードからロック解除ボタンスイッチ２１ｂを押して、出湯可能状態になって出湯ボタンスイッチ２１ｄを押して出湯を行い、その後、出湯ボタンスイッチ２１ｄを離して１０秒間の間は、ロック解除ＬＥＤ２１ｃが点灯していて、ロック解除ＬＥＤ２１ｃが消灯して１０秒間の間は、水位電極１５によって検知した加熱容器６内の貯湯量が０リットルを検知するまで、加熱容器６内への給水を行わない。加熱容器６内の貯湯量が０リットルを検知すると、出湯不可能状態に戻り、初回湯沸かしモードに移行する。また、出湯不可能状態から１０秒後に、加熱容器６内の貯湯量が１．２リットル未満を検知すると、給水湯沸かしモードに移行する。
【００４８】
次に、給水湯沸かしモードからロック解除ボタンスイッチ２１ｂを押して、出湯可能状態になって出湯ボタンスイッチ２１ｄを押して出湯を行い、その後、出湯ボタンスイッチ２１ｄを離して１０秒間の間は、ロック解除ＬＥＤ２１ｃが点灯していて、ロック解除ＬＥＤ２１ｃが消灯して１０秒間の間に、第２のサーミスタ２４の検知温度勾配が同じく１℃上昇が２秒未満となっても、加熱容器６内への水の給水を行わず、主ヒータ１１をオフして、加熱容器６内の水の連続沸騰を防止する。その後、水位電極１５によって検知した加熱容器６内の貯湯量が０リットルを検知すると、出湯不可能状態に戻り、初回湯沸かしモードに移行する。
【００４９】
このように出湯不可能状態になってから１０秒間は、加熱容器６内への水の給水動作を停止することで、出湯時の水温の低下を抑えることができる。また、出湯間隔が２０秒以内の動作に於いても、加熱容器６内への給水は行われないので、その間の出湯時の水温を下げることはない。また、給水湯沸かしモード中では、主ヒータ１１を停止することで、加熱容器６内の水の連続沸騰をさけることもできる。
【００５０】
（実施例４）
以下、本発明の実施例４について図２〜図４を参照しながら説明する。図４において実施例３と同一の構成要素については同じ符号を付し説明を省略する。
【００５１】
上記した実施例における実際の動作について、図２〜図４を参照しながら説明する。電源スイッチをオンすると、切替弁１０がオンした後、給水弁８がオンする。すると水は、水道管１から浄水カートリッジ９を通過した後、切替弁１０によって加熱容器６に貯水していく。水位電極１５により貯水量が０．３リットルに達すると、給水弁８と切替弁１０をオフして加熱容器６内への貯水は止まる。その後、主ヒータ１１と補助ヒータ１２をオンして、加熱容器６内の水を加熱する（この動作のモードを初回湯沸かしモードと呼ぶ）。また、この初回湯沸かしモード中には、出湯動作は行えない。
【００５２】
第１のサーミスタ１３の検知温度が９５℃以上に達したり、第２のサーミスタ２４の検知温度勾配が１℃上昇が２秒未満となったときに、再度、切替弁１０と給水弁８を５秒間駆動して、加熱容器６内に少量の水を給水する。１分後に第１のサーミスタ１３の検知温度が９３℃に達したり、第２のサーミスタ２４の検知温度勾配が同じく１℃上昇が２秒未満となると、再度、切替弁１０と給水弁８を５秒間駆動して、加熱容器６内に少量の水を給水する。水位電極１５の検知貯水量が１．８リットルに達すまでこれらの動作を繰り返す（この動作のモードを給水湯沸かしモードと呼ぶ）。
【００５３】
その後、主ヒータ１１と補助ヒータ１２をオフして、第１のサーミスタ１３の検知温度が９２℃未満となると、補助ヒータ１２をオンして加熱容器６内のお湯を高温保温するようになっている（この動作を保温モードと呼ぶ）。
【００５４】
保温モードからロック解除ボタンスイッチ２１ｂを押して、出湯可能状態から出湯ボタンスイッチ２１ｄを押して出湯している間は、水位電極１５によって検知した加熱容器６内の貯湯量が０リットルを検知するまで、加熱容器６内への水の給水を行わない。加熱容器６内の貯湯量が０リットルを検知すると、出湯不可能状態に戻り、初回湯沸かしモードに移行する。また、出湯ボタンスイッチ２１ｄを離して出湯停止にしてから、加熱容器６内の貯湯量が１．２リットル未満を検知すると初回湯沸かしモードに移行して、主ヒータ１１と補助ヒータ１２を駆動して、給水湯沸かしモードに移行する。
【００５５】
次に、給水湯沸かしモードからロック解除ボタンスイッチ２１ｂを押して、出湯可能状態になってから、出湯ボタンスイッチ２１ｄを押している間に、第１のサーミスタ１３の検知温度が９３℃以上に達したり、第２のサーミスタ２４の検知温度勾配が同じく１℃上昇が２秒未満となると、加熱容器６内への水の給水は、通常通り行われる。
【００５６】
このように給水湯沸かしモード中では、出湯している間の加熱容器６内への給水動作を停止しないでいることで、水の給水を停止することによる加熱容器６内の水の連続沸騰や連続沸騰を避けるための主ヒータ１１のオンオフ回数を増やさない効果がある。また、保温モード中では、出湯している間の加熱容器６内への水の給水動作を停止することで、出湯中の水温を下げない効果がある。
【００５７】
（実施例５）
以下、本発明の実施例５について図２〜図４を参照しながら説明する。保温モードからロック解除ボタンスイッチ２１ｂを押して、出湯可能状態になっている間は、水位電極１５によって検知した加熱容器６内の貯湯量が０リットルを検知するまで、加熱容器６内への給水を行わない。加熱容器６内の貯湯量が０リットルを検知すると、出湯不可能状態に戻り、初回湯沸かしモードに移行する。また、出湯不可能状態に戻り、加熱容器６内の貯湯量が１．２リットル未満を検知すると、給水湯沸かしモードに戻り、加熱容器６内への水の給水は行われる。
【００５８】
次に、給水湯沸かしモードからロック解除ボタンスイッチ２１ｂを押して、出湯可能状態になっている間に、第１のサーミスタ１３の検知温度が９３℃以上に達したり、第２のサーミスタ２４の検知温度勾配が同じく１℃上昇が２秒未満となると、加熱容器６内への水の給水は、通常通り行われる。
【００５９】
このように給水湯沸かしモード中では、出湯可能状態になっている間の加熱容器６内への水の給水動作を停止しないことで、水の給水を停止することによる加熱容器６内の水の連続沸騰や連続沸騰を避けるための主ヒータ１１のオンオフ回数を増やさない効果がある。また、保温モード中では、出湯可能状態になっている間の加熱容器６内への水の給水動作を停止することで、出湯が短い時間に何回か繰り返されても、出湯可能状態である限りでは、出湯時の水温を下げない効果がある。
【００６０】
（実施例６）
以下、本発明の実施例６について図２〜図４を参照しながら説明する。保温モードからロック解除ボタンスイッチ２１ｂを押して、出湯可能状態になって出湯ボタンスイッチ２１ｄを押して出湯行い、その後、出湯ボタンスイッチ２１ｄを離して１０秒間の間は、ロック解除ＬＥＤ２１ｃが点灯していて、ロック解除ＬＥＤ２１ｃが消灯して１０秒間の間は、水位電極１５によって検知した加熱容器６内の貯湯量が０リットルを検知するまで、加熱容器６内への給水を行わない。加熱容器６内の貯湯量が０リットルを検知すると、出湯不可能状態に戻り、初回湯沸かしモードに移行する。また、出湯不可能状態から１０秒後に、加熱容器６内の貯湯量が１．２リットル未満を検知すると、給水湯沸かしモードに戻り、加熱容器６内への水の給水は行われる。
【００６１】
次に、給水湯沸かしモードからロック解除ボタンスイッチ２１ｂを押して、出湯可能状態になって出湯ボタンスイッチ２１ｄを押して出湯行い、その後、出湯ボタンスイッチ２１ｄを離して１０秒間の間は、ロック解除ＬＥＤ２１ｃが点灯していて、ロック解除ＬＥＤ２１ｃが消灯して１０秒間の間に、第１のサーミスタ１３の検知温度が９３℃以上に達したり、第２のサーミスタ２４の検知温度勾配が同じく１℃上昇が２秒未満となると、加熱容器６内への水の給水は、通常通り行われる。
【００６２】
このように給水湯沸かしモード中では、出湯不可能状態から１０秒間は、加熱容器６内への水の給水動作を停止しないことで、給水を停止することによる加熱容器６内の水の連続沸騰や連続沸騰を避けるための主ヒータ１１のオンオフ回数を増やさない効果がある。また、保温モード中では出湯不可能状態から１０秒間は、加熱容器６内への水の給水動作を停止することで、その間の出湯時の水温を下げない効果がある。
【００６３】
【発明の効果】
以上のように本発明によれば、出湯中の加熱容器内への給水タイミングを変えることで、出湯時の出温度低下を極力抑えることができる。
【図面の簡単な説明】
【図１】本発明の実施例１及び２における給湯装置の断面図
【図２】本発明の実施例１〜６における給湯装置の表示操作部の平面図
【図３】本発明の実施例１〜６における給湯装置のポンプ回りの電気回路図
【図４】本発明の実施例３〜６における給湯装置の断面図
【符号の説明】
１水道管
４加熱ユニット
６加熱容器
８給水弁
１０切替弁
１１主ヒータ
１２補助ヒータ
１３サーミスタ
１４ポンプ
１５水位電極
２１表示操作部
２３制御手段
２４第２のサーミスタ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a built-in type hot water supply device that is used by being incorporated into a kitchen system in a general household.
[0002]
[Prior art]
The conventional built-in type hot water supply device supplies water into the heating container when the amount of hot water stored in the heating container becomes less than the first predetermined amount, and supplies water when the amount of hot water stored in the heating container reaches a second predetermined amount larger than the first predetermined amount. It was a simple configuration of stopping.
[0003]
[Problems to be solved by the invention]
However, in the above-described conventional configuration, water is supplied into the heating container when the amount of water becomes less than the first predetermined amount, even during tapping, so that the water temperature during tapping may be low.
[0004]
The present invention has been made to solve the above-mentioned conventional problem, and during hot water supply, water is not supplied into the heating container even if the amount of hot water stored in the heating container is less than the first predetermined amount. The purpose is not to lower the temperature of the water during tapping.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the hot water supply device of the present invention is configured such that during hot water supply, even if the amount of hot water stored in the heating container is less than the first predetermined amount, water is not supplied into the heating container. Things.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
The invention according to claim 1 is a heating container having heating means for heating water, a water supply valve for controlling water supply to the heating container, a pump for discharging water in the heating container, and a pump inside the heating container. The hot water storage amount of less than a predetermined amount is detected, the water supply valve is driven when the water supply detecting means, and a control means for controlling the heating means and the water supply valve, the control means, when the pump is driven, The hot water supply device does not drive the water supply valve.
[0007]
According to this configuration, at the time of tapping by the pump, even if the amount of hot water stored in the heating container becomes less than the predetermined amount, water is not supplied into the heating container, so that the water temperature at the time of tapping does not drop.
[0008]
The invention according to claim 2 is a heating container having a heating means for heating water, a water supply valve for controlling water supply to the heating container, a pump for discharging water in the heating container, and a pump inside the heating container. A hot water amount detecting means for driving a water supply valve when the hot water storage amount is less than a predetermined amount, and a control means for controlling the heating means and the water supply valve, wherein the control means comprises: The hot water supply device does not drive the water supply valve.
[0009]
According to this configuration, when the pump can be driven, even if the amount of hot water stored in the heating container is less than the predetermined amount, water is not supplied to the heating container. Does not lower the water temperature when tapping.
[0010]
The invention according to claim 3 is a heating container having heating means for heating water, a water supply valve for controlling water supply to the heating container, a pump for discharging water in the heating container, and a pump inside the heating container. A water supply detecting means for driving a water supply valve when the amount of hot water stored is less than a predetermined amount, and a control means for controlling the heating means and the water supply valve, wherein the control means performs a predetermined time after the pump is stopped. During the period, the hot water supply device does not drive the water supply valve.
[0011]
According to this configuration, when the pump can be driven, water is not supplied to the heating container even if the amount of hot water stored in the heating container is less than the predetermined amount. Does not lower the water temperature when tapping.
[0012]
The invention according to claim 4 is a heating container having heating means for heating water, a water supply valve for controlling water supply to the heating container, a pump for discharging water in the heating container, and a pump inside the heating container. Water detecting means for detecting the amount of hot water stored in the heating vessel, water temperature detecting means for detecting the temperature of water in the heating vessel, and control means for controlling the heating means and the water supply valve, the control means comprising: A heating water supply mode for repeatedly supplying water to the heating container when the detection temperature of the water temperature detection means is a predetermined temperature or a predetermined gradient while heating the means, and a heat insulation mode for performing a heat insulation operation, When the hot water amount detecting means detects the first predetermined hot water amount during the hot water supply mode, the mode shifts to the heat retaining mode, and the hot water amount detecting means during the heat retaining mode is the second predetermined hot water amount smaller than the first predetermined hot water amount. With the process proceeds to the water supply kettle mode detects, when the pump in the heat insulating mode is driven, a hot water supply apparatus does not shift to the water supply kettle mode.
[0013]
According to this configuration, during hot water supply by the pump in the warming mode, even if the amount of hot water stored in the heating container becomes less than the predetermined amount, the mode does not shift to the hot water heating mode, so that water is not supplied to the heating container. . Therefore, the water temperature at the time of tapping is not reduced. In addition, in the feed water heating mode, when the temperature detected by the temperature detecting means reaches a predetermined temperature or a predetermined gradient, water is supplied to the heating container. It is not necessary to increase the number of times the main heater is turned on and off due to boiling or stopping the main heater.
[0014]
The invention according to claim 5 is a heating container having a heating means for heating water, a water supply valve for controlling water supply to the heating container, a pump for discharging water in the heating container, and a pump inside the heating container. Water detecting means for detecting the amount of hot water stored in the heating vessel, water temperature detecting means for detecting the temperature of water in the heating vessel, and control means for controlling the heating means and the water supply valve, the control means comprising: A heating water supply mode for repeatedly supplying water to the heating container when the detection temperature of the water temperature detection means is a predetermined temperature or a predetermined gradient while heating the means, and a heat insulation mode for performing a heat insulation operation, When the hot water amount detecting means detects the first predetermined hot water amount during the hot water supply mode, the mode shifts to the heat retaining mode, and the hot water amount detecting means during the heat retaining mode is the second predetermined hot water amount smaller than the first predetermined hot water amount. With the process proceeds to the water supply kettle mode detects, wherein when the pump during insulation mode is drivable is a water heater that does not migrate into the water kettle mode.
[0015]
According to this configuration, while the pump can be driven in the heat retention mode, the mode does not shift to the hot water supply mode even if the amount of hot water stored in the heating container is less than the predetermined amount. No water is supplied into the container. Therefore, the water temperature at the time of tapping is not reduced. In addition, in the feed water heating mode, when the temperature detected by the temperature detecting means reaches a predetermined temperature or a predetermined gradient, water is supplied to the heating container. It is not necessary to increase the number of times the main heater is turned on and off due to boiling and stopping the main heater.
[0016]
The invention according to claim 6 is a heating container having a heating unit for heating water, a water supply valve for controlling water supply to the heating container, a pump for discharging water in the heating container, and a pump in the heating container. Hot water level detecting means for detecting the amount of hot water stored, water temperature detecting means for detecting the temperature of water in the heating vessel, and control means for controlling the heating means and the water supply valve, wherein the control means comprises: A heating water supply mode for repeatedly supplying water to the heating container when the temperature detected by the water temperature detecting means reaches a predetermined temperature or a predetermined gradient during heating, and a heat retaining mode for performing a heat retaining operation. When the hot water amount detecting means detects the first predetermined hot water amount during the water heating mode, the mode shifts to the heat retaining mode. During the heat retaining mode, the hot water amount detecting means changes the second predetermined hot water amount smaller than the first predetermined hot water storage amount. With the process proceeds to the water supply kettle mode to knowledge, for a predetermined time after the pump is stopped in the heat insulating mode is a water heater that does not migrate into the water kettle mode.
[0017]
According to this configuration, for a predetermined time after the pump in the heat retention mode is stopped, even if the amount of hot water stored in the heating vessel becomes less than the predetermined amount, the mode does not shift to the hot water supply mode, so intermittent operation for a long time is not performed. No water is supplied into the heating container even when tapping. Therefore, the water temperature at the time of tapping is not reduced. In addition, in the feed water heating mode, when the temperature detected by the temperature detection means reaches a predetermined temperature or a predetermined gradient, water is supplied to the heating container. It is not necessary to increase the number of times the main heater is turned on and off due to boiling or stopping the main heater.
[0018]
The invention according to claim 7 is a heating container having a heating means for heating water, a water supply valve for controlling water supply to the heating container, a pump for discharging water in the heating container, Controlling the amount of hot water to detect the amount of hot water stored, the temperature of water to detect the temperature of the water in the heating vessel, the vapor detecting means to detect the steam in the heating vessel, the heating means and the water supply valve Control means, the control means is a water heating mode for repeatedly supplying water to the heating container when the steam detection means detects steam while heating the heating means, and a heat retention mode for performing a heat retention operation. When the hot water amount detecting means detects the first predetermined hot water amount during the hot water supply water heating mode, the mode shifts to the heat retaining mode, and the hot water amount detecting means during the heat retaining mode is smaller than the first predetermined hot water storage amount. With the process proceeds to the water supply kettle mode for detecting a predetermined amount of hot water storage of, when the pump in the heat insulating mode is driven, a hot water supply apparatus does not shift to the water supply kettle mode.
[0019]
According to this configuration, during hot water supply by the pump in the warming mode, even if the amount of hot water stored in the heating container becomes less than the predetermined amount, the mode does not shift to the hot water heating mode, so that water is not supplied to the heating container. . Therefore, the water temperature at the time of tapping is not reduced. Also, in the feed water heating mode, when the steam detecting means detects steam, water is supplied into the heating container, so that the continuous supply of water in the heating container by stopping the supply of water and the main heater by stopping the main heater. It is not necessary to increase the number of times of heater ON / OFF.
[0020]
The invention according to claim 8 is a heating container having heating means for heating water, a water supply valve for controlling water supply to the heating container, a pump for discharging water in the heating container, and a pump in the heating container. Controlling the amount of hot water to detect the amount of hot water stored, the temperature of water to detect the temperature of the water in the heating vessel, the vapor detecting means to detect the steam in the heating vessel, the heating means and the water supply valve Control means, the control means is a water heating mode for repeatedly supplying water to the heating container when the steam detection means detects steam while heating the heating means, and a heat retention mode for performing a heat retention operation. When the hot water amount detecting means detects the first predetermined hot water amount during the hot water supply water heating mode, the mode shifts to the heat retaining mode, and the hot water amount detecting means during the heat retaining mode is smaller than the first predetermined hot water storage amount. While the detecting a predetermined amount of hot water storage shifts to the supply water kettle mode, wherein when the pump during insulation mode is drivable is a water heater that does not migrate into the water kettle mode.
[0021]
According to this configuration, when the pump can be driven during the heat retention mode, the mode does not shift to the hot water supply mode even when the amount of hot water stored in the heating container becomes less than the predetermined amount. No water is supplied into the container. Therefore, the water temperature at the time of tapping is not reduced. Also, in the feed water heating mode, when the steam detecting means detects steam, water is supplied into the heating container, so that the continuous supply of water in the heating container by stopping the supply of water and the main heater by stopping the main heater. It is not necessary to increase the number of times of heater ON / OFF.
[0022]
The invention according to claim 9 is a heating container having a heating means for heating water, a water supply valve for controlling water supply to the heating container, a pump for discharging water in the heating container, and a pump in the heating container. Hot water level detecting means for detecting the amount of hot water stored, water temperature detecting means for detecting the temperature of water in the heating vessel, and control means for controlling the heating means and the water supply valve, wherein the control means comprises: A heating water supply mode for repeatedly supplying water to the heating container when the temperature detected by the water temperature detection means becomes a predetermined temperature or a predetermined temperature gradient during heating, and a heat insulation mode for performing a heat insulation operation, When the hot water amount detecting means detects the first predetermined hot water amount during the hot water supply water heating mode, the mode shifts to the heat retention mode, and the hot water amount detection means during the heat retention mode is the second predetermined hot water storage amount smaller than the first predetermined hot water storage amount With the process proceeds to the water supply kettle mode when it is detected during a predetermined time after the pump is stopped in the heat insulating mode is a water heater that does not migrate into the water kettle mode.
[0023]
According to this configuration, for a predetermined time after the pump is stopped in the heat retention mode, even if the amount of hot water stored in the heating container is less than the predetermined amount, the mode does not shift to the hot water supply mode, so that intermittent hot water supply for a long time is performed. Even at this time, no water is supplied into the heating vessel. Therefore, the water temperature at the time of tapping is not reduced. Also, in the feed water heating mode, when the steam detecting means detects steam, water is supplied into the heating container, so that the continuous supply of water in the heating container by stopping the supply of water and the main heater by stopping the main heater. It is not necessary to increase the number of times of heater ON / OFF.
[0024]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0025]
(Example 1)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In FIG. 1, 1 is a water pipe, 2 is a branch tap, and 3 is a water stopcock. Reference numeral 4 denotes a heating unit of a hot water supply device housed in a kitchen unit 5, and has a heating container 6 for putting water therein.
[0026]
A connection pipe 7 branched from the water pipe 1 by a branch tap 2 is attached to an inlet of a water purification cartridge 9 via a water supply valve 8. A switching valve 10 is connected to an outlet of the water purification cartridge 9. One of the switching valves 10 (when the switching valve is on) is connected to the upper part of the heating vessel 6. At the bottom of the heating container 6, a main heater 11 for heating water, an auxiliary heater 12 for keeping the heated water warm, and a thermistor 13 for detecting the water temperature of the heating container 6 are attached.
[0027]
At the outlet of the hot water of the heating container 6, a pump 14 for discharging the hot water inside to the upper part of the kitchen unit 5 is attached. Further, a water level electrode 15 for detecting a water level is mounted in the heating vessel 6. The electrode 15 has a water level electrode so that the hot water stored in the heating vessel 6 can be detected at 0.3 liter, 0.6 liter, 0.9 liter, 1.2 liter, 1.5 liter, and 1.8 liter, respectively. Installed. In this embodiment, the heating vessel 6 has a full water volume of 1.8 liters. Reference numeral 16 denotes a water supply buffer for storing water supplied to the heating container 6 and slowly refilling the water into the heating container 6.
[0028]
Reference numeral 17 denotes a faucet provided on the upper part of the kitchen unit 5, and a hot water pipe 18 for guiding hot water in the heating vessel 6 and a water pipe branched by the switching valve 10 (when the switching valve is off). 19 and a steam pipe 20 communicating with the upper portion of the heating vessel 6. Each of these pipes 18 to 20 and faucet 1a is located facing kitchen sink 5a. A display operation unit 21 is provided on the outer surface of the faucet 17. 23 is a control means including a microcomputer for controlling the water supply valve 8 and the switching valve 10, the main heater 11, the auxiliary heater 12, the pump 14, and the display operation unit 21 based on inputs from the thermistor 13, the water level electrode 15, and the display operation unit 21. It is.
[0029]
FIG. 2 shows the display operation unit 21 of the present embodiment. When the water purification button switch 21a is pressed, the water supply valve 8 is turned on. When the water supply valve 8 is turned on, the water from the water pipe 1 passes through the water purification cartridge 9 and flows out through the water pipe 19 because the switching valve 10 is off. When the water purification button switch 21a is pressed again, the water supply valve 8 is turned off, and the flow of water from the water pipe 19 stops.
[0030]
When the lock release button switch 21b is pressed, the lock release LED 21c is turned on, and the hot water can be discharged. If the tapping button switch 21d is kept pressed within 10 seconds after the lock release button switch 21b is pushed, the pump 14 is driven only while the tapping button switch 21d is pressed, and the water in the heating vessel 6 is taken out from the hot water pipe 18 through the tapping pipe 18. I do. When the hand is released from the hot-water tap button switch 21d that is being pressed, the pump 14 is turned off, and the tapping of hot water from the hot water pipe 18 stops. At 10 seconds, the lock release LED 21c turns off, and the hot water cannot be supplied. Further, the LED 21e of the hot water amount 1, the LED 21f of the hot water amount 2 and the LED 21g of the hot water amount 3 change according to the hot water storage amount in the heating container 6 detected by the water level electrode 15. When the amount of hot water stored in the heating container 6 is less than 0.6 liter, the LED 21e of the hot water amount 1 is lit. When the amount of hot water stored in the heating container 6 is not less than 0.6 liters and less than 1.2 liters, the LED 21e for the hot water amount 1 and the LED 21f for the hot water amount 2 are lit up. When the amount of hot water stored in the heating container 6 is 1.2 liters or more, the LED 21e of the hot water amount 1, the LED 21f of the hot water amount 2, and the LED 21g of the hot water amount 3 are lit and displayed.
[0031]
FIG. 3 shows an electric circuit diagram around the pump. When the lock release button switch 21d is pressed, the lock release LED 21c is switched to the lighting display and the NPN transistor is turned on, so that the pump 14 can be driven at any time. Thereafter, the pump 14 is driven only while the hot water button switch 21d is being pressed, and the water in the heating vessel 6 is discharged from the hot water pipe 18. In this way, by making the configuration of the tapping button switch 21d such that the transistor drive and the switch are directly driven, it is possible to avoid natural tapping due to runaway of the microcomputer.
[0032]
The actual operation in the above embodiment will be described with reference to FIGS. When the power switch is turned on, the switching valve 10 is turned on, and then the water supply valve 8 is turned on. Then, the water passes through the water purification cartridge 9 from the water pipe 1 and is stored in the heating vessel 6 by the switching valve 10. When the water level reaches 0.3 liters by the water level electrode 15, the water supply valve 8 and the switching valve 10 are turned off, and the water storage in the heating vessel 6 stops. Thereafter, the main heater 11 and the auxiliary heater 12 are turned on to heat the water in the heating container 6 (this operation mode is referred to as an initial water heating mode). In addition, during the first water heater mode, the tapping operation cannot be performed. When the temperature detected by the thermistor 13 reaches 95 ° C. or higher, the switching valve 10 and the water supply valve 8 are driven again for 5 seconds to supply a small amount of water into the heating vessel 6. When the temperature detected by the thermistor 13 decreases and thereafter reaches 93 ° C. or higher, the switching valve 10 and the water supply valve 8 are driven again for 5 seconds to supply a small amount of water into the heating container 6. These operations are repeated until the detected water storage amount of the water level electrode 15 reaches 1.8 liters (this operation mode is referred to as a feed water heating mode). Thereafter, the main heater 11 and the auxiliary heater 12 are turned off, and when the detected temperature of the thermistor 13 becomes lower than 92 ° C., the auxiliary heater 12 is turned on to keep the hot water in the heating vessel 6 at a high temperature (this The operation is called a warming mode).
[0033]
From the heat retention mode, press the lock release button switch 21b to make the hot water possible, and then press the hot water button switch 21d to perform hot water supply, and heat until the hot water stored in the heating container 6 detected by the water level electrode 15 detects 0 liter. Water is not supplied into the container 6. When the amount of hot water stored in the heating vessel 6 is detected to be 0 liter, the state returns to the hot water impossible state, and the mode shifts to the first water heating mode. When the amount of hot water stored in the heating container 6 is detected to be less than 1.2 liters after stopping the hot water supply, the mode shifts to the hot water supply mode, in which the main heater 11 and the auxiliary heater 12 are driven to shift to the hot water supply mode.
[0034]
Next, from the hot water supply mode, the lock release button switch 21b is pressed to enable tapping, and then, while tapping is being performed by pressing the tapping button switch 21d, even if the detected temperature of the thermistor 13 reaches 93 ° C. or higher, The main heater 11 is turned off without supplying water into the heating container 6 to prevent continuous boiling of the water in the heating container 6. Thereafter, when the amount of hot water stored in the heating vessel 6 detected by the water level electrode 15 detects 0 liter, the state returns to the hot water impossible state and shifts to the first water heating mode.
[0035]
By stopping the operation of supplying water into the heating container 6 during tapping in this way, it is possible to suppress a decrease in water temperature during tapping. In addition, in the hot water supply mode, by stopping the main heater 11, continuous boiling of water in the heating container 6 can be avoided. Here, when the water in the heating vessel 6 is continuously boiled, steam bubbles are entangled in the screw portion of the pump 14, and a phenomenon (cavitation) in which the amount of discharged hot water is reduced occurs.
[0036]
(Example 2)
Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. In the figure, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
[0037]
The actual operation in the above embodiment will be described with reference to FIGS. When the power switch is turned on, the switching valve 10 is turned on, and then the water supply valve 8 is turned on. Then, the water passes through the water purification cartridge 9 from the water pipe 1 and is stored in the heating vessel 6 by the switching valve 10. When the water level reaches 0.3 liters by the water level electrode 15, the water supply valve 8 and the switching valve 10 are turned off, and the water storage in the heating vessel 6 stops. Thereafter, the main heater 11 and the auxiliary heater 12 are turned on to heat the water in the heating container 6 (this operation mode is referred to as an initial water heating mode). In addition, during the first water heater mode, the tapping operation cannot be performed.
[0038]
When the detection temperature gradient of the thermistor 13 requires 30 seconds or more to increase by 1 ° C., the switching valve 10 and the water supply valve 8 are driven again for 5 seconds to supply a small amount of water into the heating vessel 6. When the temperature detected by the thermistor 13 decreases and the temperature gradient detected by the thermistor 13 needs to rise by 1 ° C. for 30 seconds or more one minute later, the switching valve 10 and the water supply valve 8 are driven again for 5 seconds, and the heating vessel 6 Supply a small amount of water inside. These operations are repeated until the detected water storage amount of the water level electrode 15 reaches 1.8 liters (this operation mode is referred to as a feed water heating mode).
[0039]
Thereafter, the main heater 11 and the auxiliary heater 12 are turned off, and when the detected temperature of the thermistor 13 becomes lower than 92 ° C., the auxiliary heater 12 is turned on to keep the hot water in the heating vessel 6 at a high temperature (this The operation is called a warming mode).
[0040]
While pressing the lock release button switch 21b from the warming mode to make the hot water possible, water is supplied into the heating container 6 until the hot water storage amount in the heating container 6 detected by the water level electrode 15 detects 0 liter. Absent. When the amount of hot water stored in the heating vessel 6 is detected to be 0 liter, the state returns to the hot water impossible state, and the mode shifts to the first water heating mode. In addition, when the state returns to the hot water impossible state and the amount of hot water stored in the heating container 6 is detected to be less than 1.2 liters, the mode shifts to the hot water supply mode, in which the main heater 11 and the auxiliary heater 12 are driven to enter the hot water supply mode. Transition.
[0041]
Next, when the lock release button switch 21b is depressed from the hot water supply mode and the tapping is possible, even if the detected temperature gradient of the thermistor 13 is required to increase by 1 ° C. for 30 seconds or more, the heating container 6 may be used. The main heater 11 is turned off without supplying water to the heating vessel 6 to prevent continuous boiling of water in the heating vessel 6. Thereafter, when the amount of hot water stored in the heating vessel 6 detected by the water level electrode 15 detects 0 liter, the state returns to the hot water impossible state and shifts to the first water heating mode.
[0042]
In this way, by stopping the operation of supplying water into the heating container 6 during the hot water supply possible state, it is possible to suppress a decrease in water temperature at the time of hot water supply. Even if tapping is repeated several times in a short period of time, as long as the tapping is possible, water is not supplied into the heating vessel 6, so that the temperature of the tapping water during that time is not lowered. In addition, in the hot water supply mode, by stopping the main heater 11, continuous boiling of water in the heating container 6 can be avoided.
[0043]
(Example 3)
Hereinafter, a third embodiment of the present invention will be described with reference to FIGS. In FIG. 4, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Reference numeral 24 in FIG. 4 denotes a second thermistor 24 for detecting the vapor in the heating container 6.
[0044]
The actual operation in the above-described embodiment will be described with reference to FIGS. When the power switch is turned on, the switching valve 10 is turned on, and then the water supply valve 8 is turned on. Then, the water passes through the water purification cartridge 9 from the water pipe 1 and is stored in the heating vessel 6 by the switching valve 10. When the water level reaches 0.3 liters by the water level electrode 15, the water supply valve 8 and the switching valve 10 are turned off, and the water storage in the heating vessel 6 stops. Thereafter, the main heater 11 and the auxiliary heater 12 are turned on to heat the water in the heating container 6 (this operation mode is referred to as an initial water heating mode). In addition, during the first water heater mode, the tapping operation cannot be performed.
[0045]
When the detected temperature gradient of the second thermistor 24 increases by 1 ° C. for less than 2 seconds, the switching valve 10 and the water supply valve 8 are driven again for 5 seconds to supply a small amount of water into the heating vessel 6. . When the detected temperature of the second thermistor 24 decreases and the detected temperature gradient of the second thermistor 24 increases by 1 ° C. less than 2 seconds one minute later, the switching valve 10 and the water supply valve 8 are driven again for 5 seconds. Then, a small amount of water is supplied into the heating container 6. These operations are repeated until the detected water storage amount of the water level electrode 15 reaches 1.8 liters (this operation mode is called a feed water heating mode).
[0046]
Thereafter, the main heater 11 and the auxiliary heater 12 are turned off, and when the detected temperature of the first thermistor 13 becomes lower than 92 ° C., the auxiliary heater 12 is turned on to keep the hot water in the heating vessel 6 at a high temperature. (This operation is referred to as a warming mode).
[0047]
From the heat retention mode, the lock release button switch 21b is pressed to enable tapping, the tapping button switch 21d is pressed to perform tapping, and then the lock release LED 21c is lit for 10 seconds after releasing the tapping button switch 21d. During 10 seconds after the lock release LED 21c is turned off, water is not supplied into the heating container 6 until the amount of hot water stored in the heating container 6 detected by the water level electrode 15 detects 0 liter. When the amount of hot water stored in the heating vessel 6 is detected to be 0 liter, the state returns to the hot water impossible state, and the mode shifts to the first water heating mode. Further, when the amount of hot water stored in the heating container 6 is detected to be less than 1.2 liters 10 seconds after the hot water supply impossible state, the mode shifts to the hot water supply mode.
[0048]
Next, from the hot-water supply mode, the lock release button switch 21b is pressed to enable tapping, and the tapping button switch 21d is pressed to perform tapping. Thereafter, the lock release LED 21c is released for 10 seconds after the tapping button switch 21d is released. Even if the temperature gradient detected by the second thermistor 24 is the same and the rise of 1 ° C. is less than 2 seconds for 10 seconds after the light is turned on and the unlock LED 21c is turned off, the supply of water into the heating container 6 is performed. Is not performed, the main heater 11 is turned off to prevent continuous boiling of water in the heating vessel 6. Thereafter, when the amount of hot water stored in the heating vessel 6 detected by the water level electrode 15 detects 0 liter, the state returns to the hot water impossible state and shifts to the first water heating mode.
[0049]
By stopping the operation of supplying water into the heating vessel 6 for 10 seconds after the hot water cannot be discharged, a decrease in water temperature at the time of hot water can be suppressed. Further, even in the operation in which the tapping interval is within 20 seconds, the water is not supplied into the heating vessel 6, so that the temperature of the tapping water during that time is not lowered. In addition, in the hot water supply mode, by stopping the main heater 11, continuous boiling of water in the heating container 6 can be avoided.
[0050]
(Example 4)
Hereinafter, a fourth embodiment of the present invention will be described with reference to FIGS. In FIG. 4, the same components as those in the third embodiment are denoted by the same reference numerals, and description thereof is omitted.
[0051]
The actual operation in the above-described embodiment will be described with reference to FIGS. When the power switch is turned on, the switching valve 10 is turned on, and then the water supply valve 8 is turned on. Then, the water passes through the water purification cartridge 9 from the water pipe 1 and is stored in the heating vessel 6 by the switching valve 10. When the water level reaches 0.3 liters by the water level electrode 15, the water supply valve 8 and the switching valve 10 are turned off, and the water storage in the heating vessel 6 stops. Thereafter, the main heater 11 and the auxiliary heater 12 are turned on to heat the water in the heating container 6 (this operation mode is referred to as an initial water heating mode). In addition, during the first water heater mode, the tapping operation cannot be performed.
[0052]
When the detected temperature of the first thermistor 13 reaches 95 ° C. or higher, or when the detected temperature gradient of the second thermistor 24 increases by 1 ° C. for less than 2 seconds, the switching valve 10 and the water supply valve 8 are reset to 5 ° C. For a second, a small amount of water is supplied into the heating container 6. One minute later, when the detected temperature of the first thermistor 13 reaches 93 ° C., or when the detected temperature gradient of the second thermistor 24 increases by 1 ° C. for less than 2 seconds, the switching valve 10 and the water supply valve 8 are reset to 5 ° C. For a second, a small amount of water is supplied into the heating container 6. These operations are repeated until the detected water storage amount of the water level electrode 15 reaches 1.8 liters (this operation mode is called a feed water heating mode).
[0053]
Thereafter, the main heater 11 and the auxiliary heater 12 are turned off, and when the detected temperature of the first thermistor 13 becomes lower than 92 ° C., the auxiliary heater 12 is turned on to keep the hot water in the heating vessel 6 at a high temperature. (This operation is referred to as a warming mode).
[0054]
While the water is released by pressing the lock release button switch 21b from the warming mode and pressing the hot water button switch 21d from the hot water possible state, the heating is continued until the hot water storage amount in the heating container 6 detected by the water level electrode 15 detects 0 liter. Water is not supplied into the container 6. When the amount of hot water stored in the heating vessel 6 is detected to be 0 liter, the state returns to the hot water impossible state, and the mode shifts to the first water heating mode. Also, after the hot water supply button switch 21d is released to stop hot water supply, when the amount of hot water stored in the heating vessel 6 is detected to be less than 1.2 liters, the mode shifts to the first water heating mode, and the main heater 11 and the auxiliary heater 12 are driven. Then, the mode shifts to the feed water heating mode.
[0055]
Next, after the lock release button switch 21b is pressed from the hot water supply mode and the hot water is ready to be released, while the hot water button switch 21d is being pressed, the detected temperature of the first thermistor 13 reaches 93 ° C. or higher. When the detected temperature gradient of the second thermistor 24 also increases by 1 ° C. for less than 2 seconds, the supply of water into the heating vessel 6 is performed as usual.
[0056]
As described above, in the hot water supply mode, since the water supply operation into the heating vessel 6 during the tapping is not stopped, the continuous boiling or continuous water in the heating vessel 6 by stopping the water supply is stopped. This has the effect of not increasing the number of times the main heater 11 is turned on and off to avoid boiling. In addition, in the warming mode, the operation of supplying water into the heating vessel 6 while the hot water is being supplied is stopped, so that there is an effect that the temperature of the water during the hot water is not lowered.
[0057]
(Example 5)
Hereinafter, a fifth embodiment of the present invention will be described with reference to FIGS. While the lock release button switch 21b is pressed from the heat retention mode and the hot water is ready to be supplied, the water supply into the heating container 6 is continued until the amount of hot water stored in the heating container 6 detected by the water level electrode 15 is 0 liter. Not performed. When the amount of hot water stored in the heating vessel 6 is detected to be 0 liter, the state returns to the hot water impossible state, and the mode shifts to the first water heating mode. When the state returns to the hot water impossible state and the amount of hot water stored in the heating container 6 is detected to be less than 1.2 liters, the mode returns to the hot water heating mode, and water is supplied into the heating container 6.
[0058]
Next, when the lock release button switch 21b is pressed from the hot-water supply mode, the detected temperature of the first thermistor 13 reaches 93 ° C. or higher, or the detected temperature gradient of the second thermistor 24, while the tapping is possible. Similarly, when the 1 ° C. rise is less than 2 seconds, the supply of water into the heating vessel 6 is performed as usual.
[0059]
As described above, in the hot water supply mode, by not stopping the operation of supplying the water into the heating container 6 while the hot water is ready to be supplied, the continuous operation of the water in the heating container 6 by stopping the supply of the water is stopped. This has the effect of not increasing the number of times the main heater 11 is turned on and off to avoid boiling and continuous boiling. In addition, during the warming mode, the operation of supplying water into the heating vessel 6 while the hot water is ready to be supplied is stopped, so that the hot water can be supplied even if the hot water is repeated several times in a short time. As long as it has the effect of not lowering the water temperature when tapping.
[0060]
(Example 6)
Hereinafter, a sixth embodiment of the present invention will be described with reference to FIGS. From the heat retention mode, the lock release button switch 21b is pressed to enable tapping, and the tapping button switch 21d is pressed to perform tapping. Thereafter, the tap release button switch 21d is released and the lock release LED 21c is lit for 10 seconds. For 10 seconds after the lock release LED 21c is turned off, water is not supplied into the heating container 6 until the amount of hot water stored in the heating container 6 detected by the water level electrode 15 detects 0 liter. When the amount of hot water stored in the heating vessel 6 is detected to be 0 liter, the state returns to the hot water impossible state, and the mode shifts to the first water heating mode. Also, when the amount of hot water stored in the heating container 6 is detected to be less than 1.2 liters 10 seconds after the hot water disabling state, the mode returns to the hot water heating mode, and water is supplied into the heating container 6.
[0061]
Next, the lock release button switch 21b is depressed from the hot water supply mode, the water is ready for tapping, and the hot water discharge button switch 21d is pressed, and then the hot water is released. Then, the lock release LED 21c is turned on for 10 seconds after releasing the hot water button switch 21d. During the 10 seconds after the lock release LED 21c is turned off, the detected temperature of the first thermistor 13 reaches 93 ° C. or higher, and the detected temperature gradient of the second thermistor 24 increases by 1 ° C. for 2 seconds. When it is less than the above, the supply of water into the heating container 6 is performed as usual.
[0062]
As described above, in the hot-water supply mode, the operation of supplying water to the heating container 6 is not stopped for 10 seconds from the hot-water supply impossible state. This has the effect of not increasing the number of times the main heater 11 is turned on and off to avoid continuous boiling. In addition, by stopping the operation of supplying the water into the heating container 6 for 10 seconds from the hot water impossible state in the heat retention mode, there is an effect that the water temperature at the time of hot water supply during that time is not lowered.
[0063]
【The invention's effect】
As described above, according to the present invention, by changing the water supply timing to the inside of the heating vessel during tapping, it is possible to minimize the drop in tapping temperature during tapping.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a hot water supply device according to embodiments 1 and 2 of the present invention.
FIG. 2 is a plan view of a display operation unit of the hot water supply device according to the first to sixth embodiments of the present invention.
FIG. 3 is an electric circuit diagram around a pump of the hot water supply apparatus according to the first to sixth embodiments of the present invention.
FIG. 4 is a cross-sectional view of a hot water supply apparatus according to Embodiments 3 to 6 of the present invention.
[Explanation of symbols]
1 water pipe
4 Heating unit
6 heating vessel
8 Water supply valve
10 Switching valve
11 Main heater
12 Auxiliary heater
13 Thermistor
14 pump
15 Water level electrode
21 Display operation unit
23 control means
24 Second thermistor

Claims

A heating vessel having heating means for heating water, a water supply valve for controlling water supply to the heating vessel, a pump for discharging water in the heating vessel, and detecting that the amount of hot water stored in the heating vessel is less than a predetermined amount Then, the hot water supply device includes a hot water amount detecting means for driving the water supply valve, and a control means for controlling the heating means and the water supply valve, wherein the control means does not drive the water supply valve when the pump is driven. .

A heating vessel having heating means for heating water, a water supply valve for controlling water supply to the heating vessel, a pump for discharging water in the heating vessel, and detecting that the amount of hot water stored in the heating vessel is less than a predetermined amount Then, the hot water supply device includes a hot water amount detecting means for driving the water supply valve, and a control means for controlling the heating means and the water supply valve, wherein the control means does not drive the water supply valve when the pump can be driven.

A heating vessel having heating means for heating water, a water supply valve for controlling water supply to the heating vessel, a pump for discharging water in the heating vessel, and detecting that the amount of hot water stored in the heating vessel is less than a predetermined amount Then, the water supply valve includes a hot water amount detection unit that is driven, and a control unit that controls the heating unit and the water supply valve.The control unit controls the water supply valve for a predetermined time after the pump stops. Water heater not driven.

A heating vessel having a heating means for heating water, a water supply valve for controlling water supply to the heating vessel, a pump for discharging water in the heating vessel, and a hot water quantity detecting means for detecting the amount of hot water stored in the heating vessel Water temperature detecting means for detecting the temperature of water in the heating vessel, and control means for controlling the heating means and the water supply valve, wherein the control means detects the water temperature while heating the heating means A water supply water heating mode for repeatedly supplying water to the heating vessel when the temperature detected by the means becomes a predetermined temperature or a predetermined gradient; and a heat retention mode for performing a heat retention operation, wherein the amount of hot water is detected during the water supply water heating mode. When the means detects the first predetermined amount of hot water, the mode shifts to the heat retaining mode. When the hot water amount detecting means detects the second predetermined amount of hot water less than the first predetermined amount of hot water during the heat retaining mode, the water supply hot water is heated. With shifts to mode-when said pump in said heat insulating mode is driven, the water heater does not migrate into the water kettle mode.

A heating vessel having a heating means for heating water, a water supply valve for controlling water supply to the heating vessel, a pump for discharging water in the heating vessel, and a hot water quantity detecting means for detecting the amount of hot water stored in the heating vessel Water temperature detecting means for detecting the temperature of water in the heating vessel, and control means for controlling the heating means and the water supply valve, wherein the control means detects the water temperature while heating the heating means A water supply water heating mode for repeatedly supplying water to the heating vessel when the temperature detected by the means becomes a predetermined temperature or a predetermined gradient; and a heat retention mode for performing a heat retention operation, wherein the amount of hot water is detected during the water supply water heating mode. When the means detects the first predetermined amount of hot water, the mode shifts to the heat retaining mode. When the hot water amount detecting means detects the second predetermined amount of hot water less than the first predetermined amount of hot water during the heat retaining mode, the water supply hot water is heated. With shifts to and mode wherein when in thermal insulation mode the pump is drivable, the water heater does not migrate into the water kettle mode.

A heating vessel having a heating means for heating water, a water supply valve for controlling water supply to the heating vessel, a pump for discharging water in the heating vessel, and a hot water quantity detecting means for detecting the amount of hot water stored in the heating vessel Water temperature detecting means for detecting the temperature of water in the heating vessel, and control means for controlling the heating means and the water supply valve, wherein the control means detects the water temperature while heating the heating means A water supply water heating mode for repeatedly supplying water to the heating vessel when the temperature detected by the means becomes a predetermined temperature or a predetermined gradient; and a heat retention mode for performing a heat retention operation, wherein the amount of hot water is detected during the water supply water heating mode. When the means detects the first predetermined amount of hot water, the mode shifts to the heat retaining mode. When the hot water amount detecting means detects the second predetermined amount of hot water less than the first predetermined amount of hot water during the heat retaining mode, the water supply hot water is heated. With shifts to and mode for a predetermined time after the pump is stopped in the heat insulating mode, the water heater does not migrate into the water kettle mode.

A heating vessel having a heating means for heating water, a water supply valve for controlling water supply to the heating vessel, a pump for discharging water in the heating vessel, and a hot water quantity detecting means for detecting the amount of hot water stored in the heating vessel Water temperature detection means for detecting the temperature of the water in the heating vessel, steam detection means for detecting the steam in the heating vessel, and control means for controlling the heating means and the water supply valve, The control means has a water heating mode in which water is repeatedly supplied to the heating container when the steam detection means detects steam while heating the heating means, and a heat insulation mode in which a heat insulation operation is performed. When the hot water amount detecting means detects the first predetermined hot water amount during the mode, the mode shifts to the heat retaining mode, and the hot water amount detecting means detects the second predetermined hot water storage amount smaller than the first predetermined hot water storage amount during the heat retaining mode. You Said with shifts to water kettle mode, when the pump in the heat insulating mode is driven, the water heater does not migrate into the water kettle mode.

A heating vessel having a heating means for heating water, a water supply valve for controlling water supply to the heating vessel, a pump for discharging water in the heating vessel, and a hot water quantity detecting means for detecting the amount of hot water stored in the heating vessel Water temperature detection means for detecting the temperature of the water in the heating vessel, steam detection means for detecting the steam in the heating vessel, and control means for controlling the heating means and the water supply valve, The control means has a feed water heating mode for repeatedly supplying water to the heating container when the steam detection means detects steam while heating the heating means, and a heat keeping mode for performing a heat keeping operation. When the hot water amount detecting means detects the first predetermined hot water amount during the mode, the mode shifts to the heat retaining mode, and the hot water amount detecting means detects the second predetermined hot water storage amount smaller than the first predetermined hot water storage amount during the heat retaining mode. You It said with shifts to water kettle mode, wherein when the pump during insulation mode is drivable, the water heater does not migrate into the water kettle mode.

A heating vessel having a heating means for heating water, a water supply valve for controlling water supply to the heating vessel, a pump for discharging water in the heating vessel, and a hot water quantity detecting means for detecting the amount of hot water stored in the heating vessel Water temperature detecting means for detecting the temperature of water in the heating vessel, and control means for controlling the heating means and the water supply valve, wherein the control means detects the water temperature while heating the heating means A water supply water heating mode for repeatedly supplying water to the heating vessel when the temperature detected by the means becomes a predetermined temperature or a predetermined temperature gradient, and a heat retention mode for performing a heat retention operation, wherein the amount of the hot water during the water supply water heating mode When the detecting means detects the first predetermined hot water quantity, the mode shifts to the heat retention mode. When the hot water quantity detecting means detects the second predetermined hot water storage quantity smaller than the first predetermined hot water storage quantity during the heat keeping mode, the water supply is performed. With shifts to boil mode, for a predetermined time after the pump is stopped in the heat insulating mode, the water heater does not migrate into the water kettle mode.