JP3792338B2

JP3792338B2 - One can two water bath hot water heater

Info

Publication number: JP3792338B2
Application number: JP04701497A
Authority: JP
Inventors: 幸伸野口; 喜久雄岡本
Original assignee: 株式会社ガスター
Priority date: 1997-02-14
Filing date: 1997-02-14
Publication date: 2006-07-05
Anticipated expiration: 2017-02-14
Also published as: JPH10227523A

Description

【０００１】
【発明の属する技術分野】
本発明は、給湯熱交換器と追い焚き熱交換器が一体化され、その一体化した熱交換器を共通のバーナーで加熱する一缶二水路風呂給湯器に関するものである。
【０００２】
【従来の技術】
図２には出願人らが開発している一缶二水路風呂給湯器のシステム構成例が示されている。同図において、この一缶二水路風呂給湯器（器具）は燃焼室１を有し、この燃焼室１にはバーナー２が配設され、このバーナー２の上方には給湯熱交換器３と追い焚き熱交換器４が設けられている。これら給湯熱交換器３と追い焚き熱交換器４は一体化されて配設されている。すなわち、複数の共通のフィンプレート５に給湯側の管路を貫通装着して給湯熱交換器３と成し、同じくフィンプレート５に追い焚き側の管路を貫通装着して追い焚き熱交換器４と成しており、上記バーナー２は給湯熱交換器３と追い焚き熱交換器４を共に加熱する構成になっている。
【０００３】
上記バーナー２の下方側の燃焼室１は給気通路６に連通され、この給気通路６には燃焼ファン７が組み込まれており、燃焼ファン７の回転駆動により外部から給気通路６を介してバーナー２へ空気が送り込まれると共に、バーナー２の燃焼により生じた排気ガスがバーナー２の上方の燃焼室１に連通する排気通路９から外部へ排出される。
【０００４】
上記バーナー２のガス導入口にはガスノズル１９が対向配設され、このガスノズル１９には燃料ガスを導入するためのガス供給通路８が接続されており、このガス供給通路８により導かれた燃料ガスはガスノズル１９を介してバーナー２に供給される。また、上記ガス供給通路８には通路の開閉を行う電磁弁１０，１１ａ，１１ｂと、ガスの供給量を開弁量により制御する比例弁１２とが介設されている。
【０００５】
前記給湯熱交換器３の入側には給水通路１３の一端側が接続され、給湯熱交換器３の出側には給湯通路１４の一端側が接続されており、上記給水通路１３の他端側は外部配管を介して水供給源に接続され、前記給湯通路１４の他端側は外部配管を介して台所等の所望の給湯場所に導かれている。
【０００６】
前記追い焚き熱交換器４の入側には管路１８の一端側が接続され、この管路１８の他端側は循環ポンプ２０の吐出口に接続されており、循環ポンプ２０の吸入口には戻り管２１の一端側が接続され、戻り管２１の他端側は循環金具１６を介して浴槽２２に連接されている。また、追い焚き熱交換器４の出側には管路２３の一端側が接続されており、この管路２３の他端側は循環金具１６を介して前記浴槽２２に連接されている。上記戻り管２１と循環ポンプ２０と管路１８と追い焚き熱交換器４と管路２３により追い焚き循環通路２４が構成される。
【０００７】
上記追い焚き循環通路２４の管路１８と前記給湯通路１４は湯張り通路２５により連通されており、この湯張り通路２５には通路の開閉を制御する注湯制御弁２６と、浴槽２２の水位を検出する水位センサ２８とが設けられている。
【０００８】
なお、図中に示す３０は燃焼室１内の風量を検出する風量センサであり、３１は給水通路１３に設けられて給水の流量を検出する水量センサであり、３２は給水通路１３の水の温度を検出する入水温度センサであり、３４は給湯通路１４に設けられて通水流量を制御する流量制御弁であり、３５は給湯通路１４に設けられて給湯が行われていることを水流により検出する給湯確認スイッチであり、３６は追い焚き循環通路２４の水流を検出する水流センサであり、３７は追い焚き循環通路２４の湯水を浴槽湯水の温度（風呂温度）として検出する浴槽湯水温度検出手段である風呂温度センサであり、３８は給湯熱交換器３で作り出された湯の温度を検出する出湯温度センサである。
【０００９】
この一缶二水路風呂給湯器には制御装置４０が設けられており、この制御装置４０にはリモコン４１が接続されている。このリモコン４１には給湯温度を設定するための給湯温度設定手段や、浴槽２２の風呂の温度を設定する風呂温度設定手段４２や、浴槽２２の湯水の水位を設定する風呂水位設定手段４３や、湯張りから追い焚きを経て保温に至る自動運転の開始を指令する自動運転ボタン等が設けられている。
【００１０】
上記制御装置４０は各種センサのセンサ出力信号やリモコン４１の情報を取り込み、これら取り込んだセンサ出力や予め与えられているシーケンスプログラムに従って、給湯運転や、自動運転等の各種の運転動作を次のように制御する。
【００１１】
例えば、台所等に導かれた給湯通路の水栓が開けられ、水供給源から給水通路１３に水が流れ込んで水量センサ３１が給水通路１３の通水を検出すると、器具は給湯運転を開始する。まず、燃焼ファン７の回転駆動を開始させ、電磁弁１１ａ，１１ｂの両方又はどちらか一方と電磁弁１０を開動作させガス供給通路８を通してバーナー２に燃料ガスを供給し、図示されていない点着火手段によりバーナー２の点着火を行い燃焼を開始させる。
【００１２】
そして、給湯湯温が給湯温度設定手段に設定されている給湯設定温度となるように比例弁１２の開弁量を制御して（バーナー２への供給ガス量を制御して）バーナー２の燃焼熱量を制御し、給湯熱交換器３の通水をバーナー２の燃焼火炎により加熱して設定温度の湯を作り出し、この湯を給湯通路１４を通して給湯場所に供給する。
【００１３】
湯の使用が終了して水栓が閉められると、給湯熱交換器３への通水が停止し、水量センサ３１が給水通路１３の通水を検知しなくなったときに、電磁弁１０を閉じてバーナー２の燃焼を停止させる。その後、予め定められたポストパージ期間（例えば、５分間）が経過したときに、燃焼ファン７の回転駆動を停止して給湯運転を終了し次の給湯に備える。
【００１４】
また、前記自動運転ボタンにより自動運転の開始が指令されると、図３のフローチャートに示すように、湯張り運転を開始する（ステップ１０１）。例えば、浴槽２２に湯水が残っているか否かを判断し（ステップ１０２）、残水がないと判断したときには、注湯制御弁２６を開弁し、上記給湯運転と同様にして給湯熱交換器３で作り出された湯を、給湯通路１４と湯張り通路２５と追い焚き循環通路２４を順に介して浴槽２２に落とし込む。そして、水位センサ２８が検出する浴槽２２の水位が風呂水位設定手段４３に設定されている設定水位に達したときに、注湯制御弁２６を閉じ、電磁弁１０を閉じてバーナー２の燃焼を停止させ、湯張り運転を終了する（ステップ１０４）。
【００１５】
また、上記湯張りの開始時に、浴槽２２に残水があると判断されたときには、浴槽２２の残水が風呂温度設定手段４２に設定されている風呂の設定温度になるまで追い焚きを行う（ステップ１０３）。
【００１６】
追い焚き運転を行うときには、循環ポンプ２０を駆動させて浴槽２２内の湯水を追い焚き循環通路２４を通して循環させると共に、バーナー２の燃焼を開始させ、バーナー２の燃焼火炎により追い焚き熱交換器４の循環湯水を加熱して追い焚きを行う。そして、風呂温度センサ３７により検出される風呂温度が風呂温度設定手段４２により設定されている風呂の設定温度に達したときに、バーナー２の燃焼を停止させ、追い焚き運転を終了する。
【００１７】
上記の如く、浴槽２２の残水の追い焚きを行った後に、前記同様に、風呂水位設定手段４３に設定されている風呂の設定水位になるまで給湯熱交換器３で作られた湯を浴槽２２に注湯する。
【００１８】
そして、上記のように設定水位まで浴槽２２に湯が張られて湯張りが終了した後に、循環ポンプ２０を駆動する（ステップ１０５）。そして、風呂温度センサ３７により検出される浴槽２２の湯水温が設定温度に達しているか否かを判断し（ステップ１０６）、浴槽２２の湯水温が設定温度に達していないと判断したときには、前記追い焚きを行って浴槽２２の湯水を設定温度に高める（ステップ１０７）。また、風呂温度センサ３７により検出される浴槽湯水温が設定温度であると判断したときには、循環ポンプ２０の駆動を停止させる（ステップ１０８）。以上のように、湯張りから追い焚きを経て浴槽２２に設定水位、設定温度の湯が張られる。
【００１９】
その後、保水運転を含む保温運転が行われる。まず、制御装置４０に内蔵されているタイマをリセット・駆動させ（ステップ１０９）、水位センサ２８により検出される風呂の水位が設定水位であるか否かを判断し（ステップ１１０）、入浴者による湯の使用等により風呂の水位が設定水位よりも低下していると判断したときには、前記同様にして給湯熱交換器３で作り出した湯を浴槽２２に注湯し、風呂の水位を設定水位に高めて浴槽水位を設定水位に保持する（ステップ１１１）。
【００２０】
また、風呂の水位が設定水位であると判断されたときには、前記タイマの計測時間が予め定められた時間（例えば３０分）に達したか否かを判断し（ステップ１１２）、タイマの計測時間が設定時間に達していないときには前記浴槽水位保持動作を繰り返し行う。
【００２１】
前記タイマの計測時間が設定時間に達したときには、風呂温度センサ３７により検出される浴槽湯水温が設定温度であるか否かを判断し（ステップ１１３）、風呂の温度が設定温度よりも低下していると判断したときには、風呂の温度が設定温度になるまで追い焚きを行って風呂の温度を設定温度に保持する保温動作を行う（ステップ１１４）。
【００２２】
そして、風呂の温度が設定温度であると判断されたときには、前記ステップ１０９以降の浴槽水位保持動作と風呂の保温動作を繰り返し行う。
【００２３】
前記の如く、一缶二水路風呂給湯器は、一体化された給湯熱交換器３と追い焚き熱交換器４を共通のバーナー２を用いて加熱する方式であるので、別体に設けられた給湯熱交換器と追い焚き熱交換器をそれぞれ別個のバーナーを用いて燃焼加熱する方式に比べて、装置構成の簡易化が図れ、これに伴い、装置の小型化とコストの低減が図れることになる。
【００２４】
【発明が解決しようとする課題】
ところで、一缶二水路風呂給湯器が給湯運転を行わず追い焚き運転のみの追い焚き単独運転を行っているときには、給湯熱交換器３内に湯水が滞留している状態にあり、追い焚き運転によるバーナー２の燃焼火炎によって追い焚き熱交換器４だけでなく給湯熱交換器３も加熱されるので、上記給湯熱交換器３内の滞留湯水は加熱されて給湯熱交換器３内の滞留湯水の温度が上昇し非常に高温になる。
【００２５】
このため、追い焚き単独運転が行われているときに給湯運転が開始されると、上記追い焚き単独運転に起因して高温に加熱された給湯熱交換器３内の湯が出湯し、湯の使用者に高温給湯による不快感を与えてしまうといった高温給湯の問題が生じる虞がある。前述したような風呂の自動運転が行われているときには、追い焚き単独運転が回数多く行われるので、上記追い焚き単独運転に起因した高温給湯の問題の発生確率が高かった。
【００２６】
また、浴槽２２に残水がある状態から湯張りが行われるときに、前述したように、湯張り中に一旦湯張り運転を中断して追い焚き単独運転を行い、浴槽２２の湯水温を設定温度に高めてから浴槽２２への注湯を再開させると、設定温度に高められた浴槽２２の湯に上記追い焚き単独運転に起因して高温に高められた給湯熱交換器３の湯が注湯されることになるので、風呂の沸き上がり温度が設定温度よりも高くなる虞がある。
【００２７】
その設定温度からの湯温上昇分は湯張り運転中に追い焚き単独運転が行われていた時間等により異なり、その湯張り運転中（湯張り運転中においての湯張り中断中）の追い焚き単独運転時間は湯張り運転毎に異なるので、設定温度が同じでも湯張り運転を行う度に風呂の沸き上がり温度が異なってしまうという風呂沸き上がり温度のばらつきの問題が生じる。
【００３０】
この発明は上記課題を解決するためになされたものであり、その目的は、追い焚き単独運転に起因した高温給湯問題の発生確率の大幅な低下が図れ、しかも、風呂の沸き上がり温度のばらつきを防止することができる一缶二水路風呂給湯器を提供することにある。
【００３１】
【課題を解決するための手段】
上記目的を達成するためにこの発明は次のような構成をもって前記課題を解決する手段としている。すなわち、第１の発明は、給水通路から導かれた水を加熱し給湯通路に湯を供給する給湯熱交換器と、追い焚き循環通路に組み込まれる循環ポンプと、追い焚き循環通路に組み込まれ前記循環ポンプの駆動により追い焚き循環通路を循環する湯水を加熱する追い焚き熱交換器とを有し、上記給湯熱交換器と追い焚き熱交換器は一体化され、上記給湯熱交換器と追い焚き熱交換器を共通に加熱するバーナーが設けられ、上記給湯熱交換器で作られた湯を給湯通路を通して供給する給湯機能と、上記給湯熱交換器で作られた湯を浴槽に注湯して設定水位に自動的に湯を張る湯張り機能と、上記循環ポンプを駆動して浴槽湯水を上記追い焚き循環通路の追い焚き熱交換器を通して加熱し設定温度まで風呂の追い焚きを行う追い焚き機能とを備えた一缶二水路風呂給湯器において、湯張りが開始されてから浴槽に設定水位の湯が張られるまで追い焚きが行われるのを阻止する追い焚き阻止部が設けられている構成をもって前記課題を解決する手段としている。
【００３５】
上記構成の発明において、例えば、湯張りが開始されてから浴槽に設定水位の湯が張られるまで追い焚きを阻止する追い焚き阻止部を設けたので、上記追い焚き阻止部によって浴槽に設定水位の湯が張られるまで追い焚きが行われない。つまり、湯張り運転中に追い焚き単独運転が行われないので、湯張り運転中に、追い焚き単独運転に起因した高温給湯問題の発生が回避される。また、湯張り運転中に追い焚き単独運転が行われないので、追い焚き単独運転に起因して高温に加熱された給湯熱交換器の湯が設定温度に高められた浴槽の湯に注湯されることがなく、風呂の沸き上がり温度が設定温度よりも高くなることが回避され、設定温度に風呂を沸かすことが可能である。このことから、設定温度が同じでも湯張りを行う度に風呂の沸き上がり温度が異なるという風呂の沸き上がり温度のばらつきの問題が回避される。
【００４１】
【発明の実施の形態】
以下に、この発明の実施形態例を図面に基づき説明する。
【００４２】
本実施形態例の一缶二水路風呂給湯器は前記図２に示すシステム構成を有し、この実施形態例において特徴的な制御構成が図１に示されている。なお、図２に示す一缶二水路風呂給湯器のシステム構成の説明は前述したのでその重複説明は省略する。
【００４３】
この実施形態例において特徴的な制御装置４０は、図１に示すように、追い焚き阻止部４４と燃焼制御部４５とポンプ駆動制御部４６と給湯運転監視部４７とポンプ停止部４８とデータ格納部５０を有して構成されている。
【００４４】
上記燃焼制御部４５には給湯や自動運転等の様々な運転のシーケンスプログラムが与えられており、燃焼制御部４５は水位センサ２８や風呂温度センサ３７等の各種のセンサ出力を取り込み、これら取り込んだセンサ出力と上記シーケンスプログラムに従って給湯運転や自動運転等の各種の運転を行う。
【００４５】
追い焚き阻止部４４は、燃焼制御部４５の運転情報を取り込み、この情報に基づき器具が湯張り運転を開始したと検知したときに、燃焼制御部４５へ追い焚き阻止信号の出力を開始する。そして、追い焚き阻止部４４は、浴槽２２の水位が風呂水位設定手段４３に設定されている設定水位に達して湯張りが終了するまで、上記追い焚き阻止信号の出力を継続して行い、燃焼制御部４５の情報に基づき湯張りが終了したと検知したときに上記追い焚き阻止信号の出力を停止する。燃焼制御部４５は、上記追い焚き阻止信号を受けている間、つまり、湯張り中、追い焚き運転を行わない。
【００４６】
給湯運転監視部４７は燃焼制御部４５の運転情報を取り込み、該情報に基づき給湯運転が行われているか否かを監視する。例えば、給湯確認スイッチ３５が通水を検出しているときには給湯が行われていると検知し、それ以外のときには給湯運転は行われていないと検知される。
【００４７】
データ格納部５０は記憶装置であり、該データ格納部５０には基準水位Ｈspが予め定められ格納されている。この基準水位Ｈspは浴槽２２の循環金具１６の配設位置よりも予め定められた分だけ上側の水位（例えば、循環金具１６の最上端から５ｃｍ上側の水位）である。
【００４８】
ポンプ駆動制御部４６は前記燃焼制御部４５の運転情報を取り込み、該運転情報に基づき器具が湯張りを開始したと検知したときに、水位センサ２８のセンサ出力の取り込みを開始する。そして、ポンプ駆動制御部４６は時々刻々と取り込まれる水位センサ２８のセンサ出力に基づいて検出される浴槽２２の水位を前記データ格納部５０に格納されている基準水位Ｈspに比較し、浴槽２２の水位が上記基準水位Ｈsp以上に上昇したと検知したときに、前記給湯運転監視部４７の監視情報の取り込みを開始する。
【００４９】
ポンプ駆動制御部４６は給湯運転監視部４７の監視情報に基づき、給湯が開始されたと検知したときには、基準水位Ｈsp以上に浴槽２２に湯が張られた後の湯張り中に器具運転が湯張りから給湯に切り換えられる給湯割り込みが行われたと判断し、循環ポンプ２０を駆動させる。また、同時に、ポンプ駆動制御部４６はポンプ停止部４８にポンプ駆動開始信号を出力する。
【００５０】
この循環ポンプ２０の駆動により追い焚き熱交換器４には浴槽湯水が流れ、この追い焚き熱交換器４の通水は給湯運転によるバーナー２の燃焼火炎により加熱され浴槽２２の湯水の追い焚きが行われる。
【００５１】
この実施形態例では、上記の如く、ポンプ駆動制御部４６により循環ポンプ２０を駆動させるのは、循環金具１６の配設位置よりも高めの水位（基準水位Ｈsp）以上に湯が張られてからである。それというのは、循環金具１６の配設位置よりも低めの水位のときには追い焚き循環通路２４内は水から空気に置換されている状態であり、この状態で循環ポンプ２０を駆動させると、循環ポンプ２０に空気が取り込まれ、該空気に起因して循環ポンプ２０が故障する等の問題が生じるので、この実施形態例では、循環金具１６の配設位置よりも高めの水位に湯が張られ追い焚き循環通路２４内に湯水が入り込んでいる状態で循環ポンプ２０を駆動させるようにし、循環ポンプ２０に空気が取り込まれるのを防止して循環ポンプ２０の故障等の問題発生を回避するためである。
【００５２】
ポンプ停止部４８はポンプ駆動制御部４６からのポンプ駆動開始信号を受けてポンプ駆動制御部４６により循環ポンプ２０の駆動が開始されたと検知したときに、風呂温度設定手段４２に設定されている設定温度を取り込み、また、風呂温度センサ３７のセンサ出力の取り込みを開始する。そして、ポンプ停止部４８は風呂温度センサ３７のセンサ出力に基づいて検出される浴槽２２の湯水温度が上記設定温度に達したときには、循環ポンプ２０を停止させ、浴槽２２の湯水温が設定温度以上になるのを防止する。
【００５３】
また、ポンプ停止部４８は給湯運転監視部４７の監視情報を取り込み、ポンプ駆動制御部４６により循環ポンプ２０の駆動が開始されたと検知した後に、給湯運転監視部４７の監視情報に基づき、給湯運転の終了を検知したときには、浴槽２２の湯水温度が設定温度に達していなくても、循環ポンプ２０を停止させる。
【００５４】
前記ポンプ駆動制御部４６は、前記燃焼制御部４５の運転情報に基づき、湯張りが終了し保水運転を含む保温運転が開始されたと検知した後も、引き続き給湯運転監視部４７の監視情報を取り込み、該監視情報に基づき保水運転中に給湯運転が行われたと検知したときに、前記同様に、循環ポンプ２０の駆動を開始させる。
【００５５】
前記ポンプ停止部４８は、上記同様に、ポンプ駆動制御部４６により循環ポンプ２０の駆動が開始された後に、風呂温度センサ３７に基づいて検出される浴槽２２の湯温が設定温度に達したときには循環ポンプ２０を停止させる。又は、給湯運転監視部４７の監視情報に基づき給湯運転の終了を検知したときには、浴槽２２の湯温が設定温度に達していなくても、循環ポンプ２０を停止させる。
【００５６】
この実施形態例によれば、追い焚き阻止部４４を設け、湯張りが開始されてから設定水位に湯が張られるまで、上記追い焚き阻止部４４によって追い焚き単独運転が行われるのが阻止されるので、従来のような湯張りの開始後に浴槽２２の残水を設定温度まで高める追い焚き単独運転が行われなくなり、湯張り運転時の湯張り中断中の追い焚き単独運転に起因した高温給湯の問題、つまり、追い焚き単独運転中に給湯が開始されたときに、追い焚き単独運転に起因して高温に加熱された給湯熱交換器３の湯が出湯して湯の使用者に高温給湯による不快感を与えてしまうという問題を回避することができる。
【００５７】
また、上記の如く、追い焚き阻止部４４の動作によって、湯張り運転中に浴槽２２の湯水を設定温度に高めるための追い焚き単独運転が行われないので、その追い焚き単独運転により設定温度に高められた浴槽２２の湯水に追い焚き単独運転に起因して高温に加熱された給湯熱交換器３の湯が加えられ、風呂の沸き上がり温度が設定温度よりも高くなるという問題を回避することができ、設定温度の湯を張ることができる。このことから、追い焚き単独運転に起因した風呂の沸き上がり温度のばらつきの問題を防止することができる。
【００５８】
さらに、ポンプ駆動制御部４６を設け、湯張り中に給湯割り込みが行われたときに上記ポンプ駆動制御部４６によって循環ポンプ２０を駆動させるので、湯張り中の給湯割り込み時に追い焚き熱交換器４に浴槽湯水が流れ、給湯運転によるバーナー２の燃焼火炎は給湯熱交換器３の通水を加熱するだけでなく上記追い焚き熱交換器４の通水を加熱して浴槽２２の湯水の追い焚きを行うことができる。このため、浴槽２２が空の状態から湯張りを開始したときにはもちろんのこと、浴槽２２に残水があった状態から湯張りが開始された場合に残水の追い焚きを行わなくても、湯張り終了時には浴槽湯水温度を設定温度に近い温度にすることができるので、湯張り終了直後の追い焚き単独運転時間を短縮させることができる。
【００５９】
さらに、上記ポンプ駆動制御部４６は保温中に給湯が行われるときに循環ポンプ２０を駆動させるので、給湯運転が行われる度に浴槽２２の湯水の追い焚きを行うことができる。このため、保温中の浴槽湯水温の低下を防止することができ、このことにより、保温運転により浴槽２２の湯水温を設定温度に高めるための追い焚き単独運転の運転回数を減少させることができる。
【００６０】
また、上記の如く、ポンプ駆動制御部４６の動作によって保温中の浴槽湯水温の低下を小さくすることができるので、保温運転による追い焚き単独運転時に浴槽湯水温を設定温度に高めるのに要する時間は短くて済み、追い焚き単独運転を行っている追い焚き単独運転時間の短縮を図ることができる。
【００６１】
以上のように、追い焚き阻止部４４とポンプ駆動制御部４６を設けたことによって、自動運転中の追い焚き単独運転の運転回数を大幅に削減させることができ、また、追い焚き単独運転時間の短縮を図ることができるので、追い焚き単独運転に起因した前記高温給湯問題の発生確率を大幅に低下させることができ、追い焚き単独運転に起因した高温給湯問題をほぼ防止することができる。
【００６２】
さらに、ポンプ停止部４８を設け、ポンプ駆動制御部４６による循環ポンプ２０の駆動中に浴槽２２の湯温が設定温度に達したときには、上記ポンプ停止部４８によって、循環ポンプ２０が停止されるので、ポンプ駆動制御部４６による循環ポンプ２０の駆動によって浴槽２２の湯温が設定温度よりも高くなることが防止される。
【００６３】
さらに、湯張り中に、ポンプ駆動制御部４６による循環ポンプ２０の駆動中に給湯運転が終了したときには、上記ポンプ停止部４８により循環ポンプ２０が停止されるので、給湯運転後にスムーズに湯張り運転の再開を行うことができる。
【００６４】
また、保温運転中に給湯単独運転が行われた直後に追い焚き運転が行われると、給湯単独運転に起因して高温に加熱した追い焚き熱交換器４の滞留湯水が浴槽２２に噴出し、浴槽２２の入浴者に高温の湯がかかる虞があったが、この実施形態例に示すように、保温運転中に給湯運転が行われるときには、循環ポンプ２０を駆動させて追い焚き熱交換器４に高温の湯が滞留するのを回避することができるので、給湯単独運転に起因して高温の湯が浴槽２２に噴出するという問題が確実に回避される。
【００６５】
なお、この発明は上記実施形態例に限定されるものではなく、様々な実施の形態を採り得る。例えば、上記実施形態例では、追い焚き阻止部４４は、燃焼制御部４５の運転情報を取り込み、該運転情報に基づき湯張り運転の開始を検知していたが、水位センサ２８のセンサ出力を取り込み、予め定めた単位時間当たりの水位センサ２８のセンサ出力の変化量が予め定めた範囲内の値になったときに、湯張り運転による浴槽２２の浴槽水位の上昇であると判断して湯張りが開始されたと検知するようにしてもよい。
【００６６】
また、追い焚き阻止部４４は燃焼制御部４５の運転情報に基づき湯張り運転の終了を検知していたが、例えば、水位センサ２８のセンサ出力を取り込み、予め定めた単位時間当たりの水位センサ２８のセンサ出力の変化量がほぼ零になったときに、湯張りが終了したと検知するようにしてもよい。
【００７１】
さらに、上記実施形態例は図２に示すシステム構成の一缶二水路風呂給湯器を例にして説明したが、一缶二水路タイプで給湯機能と湯張り機能を備えている風呂給湯器であれば、図２の器具に限定されずに、この発明は適用することができる。
【００７２】
【発明の効果】
この発明によれば、追い焚き阻止部を設け、該追い焚き阻止部によって湯張りが開始されてから設定水位の湯が張られるまで追い焚き運転を阻止する。したがって、湯張り運転中に追い焚き単独運転が行われないので、湯張り運転中に追い焚き単独運転が行われることに起因した高温給湯の問題、つまり、追い焚き単独運転中に給湯が開始されて追い焚き単独運転に起因して高温に加熱された給湯熱交換器の湯が出湯し湯の使用者に高温給湯による不快感を与えるという高温給湯の問題を回避することができる。
【００７３】
また、湯張り運転中に、浴槽湯水を設定温度まで高める追い焚き単独運転が行われると、その追い焚き単独運転に起因して高温に加熱された給湯熱交換器の湯が上記設定温度に高められた浴槽湯水に注湯されるので、風呂の沸き上がり温度が設定温度よりも高めになるという問題や、設定温度が同じでも湯張りを行う度に風呂の沸き上がり温度が異なるという風呂の沸き上がり温度のばらつきの問題を回避することができる。
【図面の簡単な説明】
【図１】この発明に係る実施形態例を示すブロック構成図である。
【図２】一缶二水路風呂給湯器の一例を示すモデル図である。
【図３】自動運転の一例を示すフローチャートである。
【符号の説明】
２バーナー
３給湯熱交換器
４追い焚き熱交換器
１３給水通路
１４給湯通路
２０循環ポンプ
２４追い焚き循環通路
３７風呂温度センサ
４４追い焚き阻止部
４６ポンプ駆動制御部
４８ポンプ停止部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a canned two-way bath water heater in which a hot water supply heat exchanger and a reheating heat exchanger are integrated, and the integrated heat exchanger is heated by a common burner.
[0002]
[Prior art]
FIG. 2 shows a system configuration example of a one-can two-water bath water heater developed by the applicants. In the figure, this single can two water bath water heater (equipment) has a combustion chamber 1, a burner 2 is disposed in the combustion chamber 1, and a hot water supply heat exchanger 3 and a follower are disposed above the burner 2. A soaking heat exchanger 4 is provided. These hot water supply heat exchangers 3 and reheating heat exchangers 4 are integrated. That is, the hot water supply side pipe line is inserted through a plurality of common fin plates 5 to form the hot water supply heat exchanger 3, and the reheating side pipe line is also inserted through the fin plate 5 to reheat the heat exchanger. The burner 2 is configured to heat both the hot water supply heat exchanger 3 and the reheating heat exchanger 4.
[0003]
The combustion chamber 1 on the lower side of the burner 2 communicates with an air supply passage 6, and a combustion fan 7 is incorporated in the air supply passage 6. Then, air is sent to the burner 2 and exhaust gas generated by the combustion of the burner 2 is discharged to the outside from the exhaust passage 9 communicating with the combustion chamber 1 above the burner 2.
[0004]
A gas nozzle 19 is disposed opposite to the gas inlet of the burner 2, and a gas supply passage 8 for introducing fuel gas is connected to the gas nozzle 19, and the fuel gas introduced by the gas supply passage 8 is connected to the gas nozzle 19. Is supplied to the burner 2 via the gas nozzle 19. The gas supply passage 8 is provided with electromagnetic valves 10, 11a, 11b for opening and closing the passage, and a proportional valve 12 for controlling the gas supply amount by the valve opening amount.
[0005]
One end side of the water supply passage 13 is connected to the inlet side of the hot water supply heat exchanger 3, one end side of the hot water supply passage 14 is connected to the outlet side of the hot water supply heat exchanger 3, and the other end side of the water supply passage 13 is It is connected to a water supply source through an external pipe, and the other end of the hot water supply passage 14 is led to a desired hot water supply place such as a kitchen through the external pipe.
[0006]
One end of a pipe 18 is connected to the inlet side of the reheating heat exchanger 4, and the other end of the pipe 18 is connected to the discharge port of the circulation pump 20. One end side of the return pipe 21 is connected, and the other end side of the return pipe 21 is connected to the bathtub 22 via the circulation fitting 16. In addition, one end side of the pipe line 23 is connected to the outlet side of the reheating heat exchanger 4, and the other end side of the pipe line 23 is connected to the bathtub 22 via the circulation fitting 16. The return pipe 21, the circulation pump 20, the pipe 18, the reheating heat exchanger 4, and the line 23 constitute a recirculation circulation path 24.
[0007]
The pipe 18 of the recirculation circulation passage 24 and the hot water supply passage 14 are communicated with each other by a hot water filling passage 25, and the hot water filling passage 25 has a pouring control valve 26 for controlling the opening and closing of the passage, and the water level of the bathtub 22. And a water level sensor 28 for detecting the above.
[0008]
In the figure, 30 is an air volume sensor that detects the air volume in the combustion chamber 1, 31 is a water volume sensor that is provided in the water supply passage 13 and detects the flow rate of the water supply, and 32 is water in the water supply passage 13. A water temperature sensor for detecting temperature, 34 is a flow rate control valve provided in the hot water supply passage 14 to control the flow rate of water flow, and 35 is provided in the hot water supply passage 14 to indicate that hot water is being supplied. A hot water supply confirmation switch to be detected, 36 is a water flow sensor for detecting the water flow in the recirculation circulation passage 24, and 37 is a bath water temperature detection for detecting the hot water in the recirculation circulation passage 24 as a bath water temperature (bath temperature). A bath temperature sensor is a means, and 38 is a hot water temperature sensor for detecting the temperature of hot water produced by the hot water supply heat exchanger 3.
[0009]
A control device 40 is provided in the single can two water bath hot water heater, and a remote controller 41 is connected to the control device 40. The remote controller 41 includes a hot water supply temperature setting means for setting the hot water supply temperature, a bath temperature setting means 42 for setting the bath temperature of the bathtub 22, a bath water level setting means 43 for setting the hot water level of the bathtub 22, An automatic operation button or the like for instructing the start of automatic operation from hot water filling to chasing after warming is provided.
[0010]
The control device 40 captures sensor output signals of various sensors and information from the remote controller 41, and performs various operation operations such as hot water supply operation and automatic operation as follows in accordance with the captured sensor output and a sequence program given in advance. To control.
[0011]
For example, when a faucet of a hot water supply passage led to a kitchen or the like is opened, water flows into the water supply passage 13 from a water supply source, and the water amount sensor 31 detects water passing through the water supply passage 13, the appliance starts a hot water supply operation. . First, the rotational drive of the combustion fan 7 is started, and both or one of the solenoid valves 11a and 11b and the solenoid valve 10 are opened to supply the fuel gas to the burner 2 through the gas supply passage 8, which is not shown. The burner 2 is ignited by ignition means to start combustion.
[0012]
The combustion amount of the burner 2 is controlled by controlling the valve opening amount of the proportional valve 12 (controlling the amount of gas supplied to the burner 2) so that the hot water temperature becomes the hot water supply temperature set in the hot water temperature setting means. The amount of heat is controlled, and the water passing through the hot water supply heat exchanger 3 is heated by the combustion flame of the burner 2 to produce hot water having a set temperature, and this hot water is supplied to the hot water supply place through the hot water supply passage 14.
[0013]
When the use of hot water is finished and the faucet is closed, water flow to the hot water supply heat exchanger 3 is stopped, and the electromagnetic valve 10 is closed when the water amount sensor 31 no longer detects water flow through the water supply passage 13. The combustion of the burner 2 is stopped. Thereafter, when a predetermined post-purge period (for example, 5 minutes) elapses, the rotation drive of the combustion fan 7 is stopped, the hot water supply operation is terminated, and the next hot water supply is prepared.
[0014]
When the start of the automatic operation is commanded by the automatic operation button, the hot water operation is started as shown in the flowchart of FIG. 3 (step 101). For example, it is determined whether or not hot water remains in the bathtub 22 (step 102), and when it is determined that there is no residual water, the hot water control valve 26 is opened and the hot water supply heat exchanger is operated in the same manner as in the hot water supply operation. The hot water produced in 3 is dropped into the bathtub 22 through the hot water supply passage 14, the hot water filling passage 25, and the recirculation circulation passage 24 in this order. When the water level of the bathtub 22 detected by the water level sensor 28 reaches the set water level set in the bath water level setting means 43, the pouring control valve 26 is closed and the solenoid valve 10 is closed to burn the burner 2. The hot water filling operation is terminated (step 104).
[0015]
When it is determined that there is residual water in the bathtub 22 at the start of the hot water filling, the hot water is replenished until the residual water in the bathtub 22 reaches the set temperature of the bath set in the bath temperature setting means 42 ( Step 103).
[0016]
When the reheating operation is performed, the circulation pump 20 is driven to circulate hot water in the bathtub 22 through the recirculation circulation passage 24, and combustion of the burner 2 is started, and the reheating heat exchanger 4 is heated by the combustion flame of the burner 2. Heat up the circulating hot water and reheat. Then, when the bath temperature detected by the bath temperature sensor 37 reaches the set temperature of the bath set by the bath temperature setting means 42, the combustion of the burner 2 is stopped and the reheating operation is ended.
[0017]
As described above, after replenishing the remaining water in the bathtub 22, the hot water produced by the hot water supply heat exchanger 3 is used until the bath water level set in the bath water level setting means 43 is reached. Pour water into No. 22.
[0018]
Then, after hot water is filled in the bathtub 22 to the set water level as described above and the hot water filling is completed, the circulation pump 20 is driven (step 105). Then, it is determined whether or not the hot water temperature of the bathtub 22 detected by the bath temperature sensor 37 has reached the set temperature (step 106), and when it is determined that the hot water temperature of the bathtub 22 has not reached the set temperature, The hot water in the bathtub 22 is raised to a set temperature by reheating (step 107). When it is determined that the bath water temperature detected by the bath temperature sensor 37 is the set temperature, the driving of the circulation pump 20 is stopped (step 108). As described above, hot water having a set water level and a set temperature is filled in the bathtub 22 after reheating from the hot water filling.
[0019]
Thereafter, a heat retaining operation including a water retaining operation is performed. First, a timer built in the control device 40 is reset and driven (step 109), and it is determined whether or not the water level of the bath detected by the water level sensor 28 is a set water level (step 110). When it is determined that the bath water level is lower than the set water level due to the use of hot water, the hot water produced by the hot water supply heat exchanger 3 is poured into the bathtub 22 in the same manner as described above, and the bath water level is set to the set water level. The bath water level is raised and held at the set water level (step 111).
[0020]
Further, when the bath water level is determined to be the set water level, it is determined whether or not reached to the time measurement time of the timer reaches a predetermined (e.g., 30 minutes) (step 112), measurement of the timer When the time does not reach the set time, the bathtub water level holding operation is repeated.
[0021]
When the measured time of the timer reaches the set time, it is determined whether or not the bath water temperature detected by the bath temperature sensor 37 is the set temperature (step 113), and the bath temperature falls below the set temperature. If it is determined that the temperature of the bath has reached the preset temperature, a warming operation is performed until the bath temperature reaches the set temperature to maintain the bath temperature at the set temperature (step 114).
[0022]
When it is determined that the bath temperature is the set temperature, the bath water level holding operation and the bath heat holding operation after Step 109 are repeated.
[0023]
As described above, the single can two water bath hot water heater is a system in which the integrated hot water supply heat exchanger 3 and the reheating heat exchanger 4 are heated by using the common burner 2, and thus are provided separately. Compared with the method in which the hot water supply heat exchanger and the reheating heat exchanger are each heated by combustion using separate burners, the structure of the apparatus can be simplified, and accordingly, the apparatus can be reduced in size and cost can be reduced. Become.
[0024]
[Problems to be solved by the invention]
By the way, when one can two water bath hot water heater does not perform the hot water supply operation but performs only the reheating operation, the hot water stays in the hot water heat exchanger 3, and the reheating operation is performed. Since not only the reheating heat exchanger 4 but also the hot water supply heat exchanger 3 is heated by the combustion flame of the burner 2 caused by the above, the hot water in the hot water supply heat exchanger 3 is heated and the hot water in the hot water supply heat exchanger 3 is heated. The temperature rises and becomes very hot.
[0025]
For this reason, when the hot water supply operation is started while the reheating independent operation is performed, the hot water in the hot water supply heat exchanger 3 heated to a high temperature due to the reheating independent operation is discharged, There is a possibility that the problem of high-temperature hot water supply such as giving the user discomfort due to high-temperature hot water supply may occur. When the bath is automatically operated as described above, since the reheating independent operation is performed many times, the probability of occurrence of a problem of high-temperature hot water caused by the reheating independent operation is high.
[0026]
Also, when hot water filling is performed from the state where there is residual water in the bathtub 22, as described above, the hot water operation is temporarily interrupted during the hot water filling and the hot water operation is performed alone, and the hot water temperature of the bathtub 22 is set. When the pouring of the hot water into the bathtub 22 is resumed after the temperature is raised, the hot water of the hot water supply heat exchanger 3 that has been raised to a high temperature due to the above-described independent operation is poured into the hot water of the bathtub 22 that has been raised to the set temperature. Since it will be hot water, the boiling temperature of the bath may be higher than the set temperature.
[0027]
The temperature rise from the set temperature varies depending on the time during which the hot water operation was carried out during the hot water operation , etc., and the hot water operation during the hot water operation (when the hot water operation was interrupted) Since the operation time is different for each hot water operation, there is a problem of variation in the hot water temperature of the bath where the hot water temperature of the bath is different every time the hot water operation is performed.
[0030]
The present invention has been made to solve the above-mentioned problems, and its purpose is to greatly reduce the probability of occurrence of a high-temperature hot water supply problem caused by a reheating single operation, and to reduce the variation in the boiling temperature of the bath. An object of the present invention is to provide a single can two water channel bath water heater that can be prevented.
[0031]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has the following configuration as means for solving the above problems. That is, the first invention is a hot water heat exchanger that heats water guided from the water supply passage and supplies hot water to the hot water supply passage, a circulation pump that is incorporated in the recirculation circulation passage, and a recirculation circulation passage that is incorporated in the recirculation circulation passage. A reheating heat exchanger that heats the hot water circulating in the recirculation circulation path by driving a circulation pump, and the hot water heat exchanger and reheating heat exchanger are integrated, and the reheating heat exchanger and reheating A burner that heats the heat exchanger in common is provided, and a hot water supply function that supplies hot water made by the hot water supply heat exchanger through the hot water supply passage and hot water made by the hot water heat exchanger are poured into the bathtub. Hot water filling function that automatically fills hot water at the set water level and reheating function that drives the circulating pump and heats the bath water through the reheating heat exchanger in the recirculation passage to reheat the bath to the set temperature. And one with Means for solving the above-mentioned problem in a two-water channel hot water heater having a configuration in which a rebirth prevention unit is provided to prevent rebirth from being performed until hot water of a set water level is filled in a bathtub after the start of refilling It is said.
[0035]
In the invention of the above configuration, for example, because the hot water filling is hot water of setting the bathtub water from the start is provided a blocking unit reheating to prevent reheating until spanned, the set water level in the bathtub by the reheating blocking portion There is no chasing until the hot water is filled. That is, since the independent operation reheating during water filling operation is not performed, during water filling operation, the generation of hot water heating problems due to the single operation reheating is avoided. In addition, since the reheating independent operation is not performed during the hot water filling operation , the hot water of the hot water heat exchanger heated to a high temperature due to the reheating independent operation is poured into the hot water of the bathtub raised to the set temperature. Therefore, it is possible to prevent the bath boiling temperature from becoming higher than the set temperature and to boil the bath at the set temperature. This avoids the problem of variation in the boiling temperature of the bath, in which the boiling temperature of the bath is different each time the hot water is filled, even if the set temperature is the same.
[0041]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0042]
The single can two-way bath water heater of this embodiment has the system configuration shown in FIG. 2, and a characteristic control configuration in this embodiment is shown in FIG. In addition, since description of the system configuration | structure of the one can two water channel bath water heater shown in FIG. 2 was mentioned above, the duplication description is abbreviate | omitted.
[0043]
As shown in FIG. 1, the characteristic control device 40 in this embodiment includes a reheating prevention unit 44, a combustion control unit 45, a pump drive control unit 46, a hot water supply operation monitoring unit 47, a pump stop unit 48, and data storage. The unit 50 is configured.
[0044]
The combustion control unit 45 is provided with various operation sequence programs such as hot water supply and automatic operation, and the combustion control unit 45 takes in and outputs various sensor outputs such as the water level sensor 28 and the bath temperature sensor 37. Various operations such as a hot water supply operation and an automatic operation are performed according to the sensor output and the sequence program.
[0045]
The refueling prevention unit 44 takes in the operation information of the combustion control unit 45 and starts outputting a renewal prevention signal to the combustion control unit 45 when it is detected that the appliance has started the hot water filling operation based on this information. The reheating prevention unit 44 continues to output the renewal prevention signal until the water level in the bathtub 22 reaches the set water level set in the bath water level setting means 43 and the filling of the hot water is finished. When it is detected that the hot water filling is completed based on the information of the control unit 45, the output of the chasing prevention signal is stopped. The combustion control unit 45 does not perform the chasing operation while receiving the chasing inhibition signal, that is, during hot water filling.
[0046]
The hot water supply operation monitoring unit 47 takes in the operation information of the combustion control unit 45 and monitors whether or not the hot water supply operation is performed based on the information. For example, when the hot water supply confirmation switch 35 detects water flow, it is detected that hot water is being supplied, and otherwise, it is detected that the hot water supply operation is not being performed.
[0047]
The data storage unit 50 is a storage device, and a reference water level Hsp is determined and stored in the data storage unit 50 in advance. This reference water level Hsp is a water level that is a predetermined amount higher than the position of the circulation fitting 16 in the bathtub 22 (for example, a water level that is 5 cm above the uppermost end of the circulation fitting 16).
[0048]
The pump drive control unit 46 takes in the operation information of the combustion control unit 45, and starts taking in the sensor output of the water level sensor 28 when it is detected that the appliance has started hot water filling based on the operation information. And the pump drive control part 46 compares the water level of the bathtub 22 detected based on the sensor output of the water level sensor 28 taken in every moment with the reference | standard water level Hsp stored in the said data storage part 50, and the bathtub 22's When it is detected that the water level has risen above the reference water level Hsp, the monitoring information of the hot water supply operation monitoring unit 47 starts to be taken.
[0049]
When the pump drive control unit 46 detects that the hot water supply is started based on the monitoring information of the hot water supply operation monitoring unit 47, the appliance operation is performed during the hot water filling after the hot water is filled in the bathtub 22 above the reference water level Hsp. It is determined that a hot water supply interruption for switching from hot water supply to hot water supply has been performed, and the circulation pump 20 is driven. At the same time, the pump drive control unit 46 outputs a pump drive start signal to the pump stop unit 48.
[0050]
By the driving of the circulation pump 20, the hot water in the bathtub flows through the reheating heat exchanger 4, and the water in the reheating heat exchanger 4 is heated by the combustion flame of the burner 2 by the hot water supply operation, thereby reheating the hot water in the bathtub 22. Done.
[0051]
In this embodiment, as described above, the pump drive controller 46 drives the circulation pump 20 after hot water is filled above the water level (reference water level Hsp) higher than the position where the circulation fitting 16 is disposed. It is. That is, when the water level is lower than the position where the circulation fitting 16 is disposed, the recirculation circulation passage 24 is in a state where water is replaced with air. When the circulation pump 20 is driven in this state, the circulation pump 20 is circulated. Since air is taken into the pump 20 and a problem such as failure of the circulation pump 20 occurs due to the air, in this embodiment, hot water is stretched to a higher water level than the position where the circulation fitting 16 is disposed. In order to avoid the occurrence of problems such as failure of the circulation pump 20 by driving the circulation pump 20 while hot water is entering the recirculation circulation passage 24 to prevent air from being taken into the circulation pump 20. is there.
[0052]
When the pump stop unit 48 receives the pump drive start signal from the pump drive control unit 46 and detects that the drive of the circulation pump 20 is started by the pump drive control unit 46, the setting set in the bath temperature setting means 42 The temperature is captured, and the sensor output of the bath temperature sensor 37 is captured. And the pump stop part 48 stops the circulation pump 20 when the hot water temperature of the bathtub 22 detected based on the sensor output of the bath temperature sensor 37 reaches the said setting temperature, and the hot water temperature of the bathtub 22 is more than preset temperature. To prevent becoming.
[0053]
Further, the pump stop unit 48 takes in the monitoring information of the hot water supply operation monitoring unit 47, and after detecting that the driving of the circulation pump 20 is started by the pump drive control unit 46, based on the monitoring information of the hot water supply operation monitoring unit 47, When it is detected that the hot water temperature of the bathtub 22 has not reached the set temperature, the circulation pump 20 is stopped.
[0054]
The pump drive control unit 46 continues to capture the monitoring information of the hot water supply operation monitoring unit 47 even after detecting that the hot water filling is completed and the heat insulation operation including the water retention operation is started based on the operation information of the combustion control unit 45. Then, when it is detected that the hot water supply operation is performed during the water retention operation based on the monitoring information, the circulation pump 20 is started to be driven as described above.
[0055]
Similarly to the above, when the pump temperature of the bathtub 22 detected based on the bath temperature sensor 37 reaches the set temperature after the pump drive control unit 46 starts driving the circulation pump 20, the pump stop unit 48 is the same as described above. The circulation pump 20 is stopped. Alternatively, when the end of the hot water supply operation is detected based on the monitoring information of the hot water supply operation monitoring unit 47, the circulation pump 20 is stopped even if the hot water temperature of the bathtub 22 has not reached the set temperature.
[0056]
According to this embodiment example, the rebirth prevention unit 44 is provided, and the rebirth prevention unit 44 prevents the reheating independent operation from being started until the hot water is filled to the set water level after the hot water filling is started. Therefore, after the start of hot water filling, after the start of hot water filling, the reheating independent operation for raising the remaining water of the bathtub 22 to the set temperature is not performed, and high temperature hot water supply caused by the hot water independent operation during hot water filling operation is suspended. Problem, that is, when hot water supply is started during the reheating independent operation, the hot water of the hot water supply heat exchanger 3 heated to a high temperature due to the reheating independent operation is discharged to the hot water user. It is possible to avoid the problem of causing discomfort due to.
[0057]
Further, as described above, the reheating prevention unit 44 does not perform the reheating independent operation for raising the hot water in the bathtub 22 to the set temperature during the hot water filling operation. To avoid the problem that the hot water of the hot water supply heat exchanger 3 heated to a high temperature due to the isolated operation is added to the hot water of the bathtub 22 and the boiling temperature of the bath becomes higher than the set temperature. It is possible to fill the hot water at the set temperature. From this, it is possible to prevent the problem of variations in the boiling temperature of the bath due to the chasing single operation.
[0058]
Further, a pump drive control unit 46 is provided, and the circulating pump 20 is driven by the pump drive control unit 46 when a hot water supply interruption is performed during hot water filling. The hot water in the bathtub flows, and the combustion flame of the burner 2 by the hot water supply operation not only heats the water flow in the hot water heat exchanger 3 but also heats the water flow in the reheating heat exchanger 4 to reheat the hot water in the bathtub 22. It can be performed. For this reason, when hot water filling is started from the state in which the bathtub 22 is empty, the hot water is not required to be refilled when hot water filling is started from the state in which there is residual water in the bathtub 22. Since the bathtub hot water temperature can be set to a temperature close to the set temperature at the end of the tensioning, it is possible to reduce the time for reheating the single operation immediately after the completion of the hot water tensioning.
[0059]
Furthermore, since the pump drive control unit 46 drives the circulation pump 20 when hot water is supplied during heat insulation, the hot water in the bathtub 22 can be replenished every time the hot water supply operation is performed. For this reason, it is possible to prevent a decrease in the temperature of the hot water in the bathtub during the heat retention, and thus it is possible to reduce the number of times of the reheating single operation for increasing the hot water temperature in the bathtub 22 to the set temperature by the heat retention operation. .
[0060]
In addition, as described above, the decrease in the bath water temperature during the heat insulation can be reduced by the operation of the pump drive control unit 46, so the time required for raising the bath water temperature to the set temperature during the reheating independent operation by the heat insulation operation. Can be shortened, and it is possible to shorten the time of the chasing alone operation when the chasing alone operation is performed.
[0061]
As described above, by providing the follow-up prevention unit 44 and the pump drive control unit 46, it is possible to drastically reduce the number of times of the follow-up single operation during the automatic operation, Since the reduction can be achieved, the occurrence probability of the high temperature hot water supply problem caused by the reheating independent operation can be greatly reduced, and the high temperature hot water supply problem caused by the reheating independent operation can be substantially prevented.
[0062]
Further, a pump stop unit 48 is provided. When the hot water temperature in the bathtub 22 reaches a set temperature while the pump drive control unit 46 is driving the circulation pump 20, the pump stop unit 48 stops the circulation pump 20. Further, the hot water temperature of the bathtub 22 is prevented from becoming higher than the set temperature by driving the circulation pump 20 by the pump drive control unit 46.
[0063]
Further, when the hot water supply operation is completed while the circulating pump 20 is being driven by the pump drive control unit 46 during the hot water filling, the circulating pump 20 is stopped by the pump stop unit 48, so that the hot water filling operation is smoothly performed after the hot water supply operation. Can be resumed.
[0064]
Further, when the reheating operation is performed immediately after the hot water supply single operation is performed during the heat insulation operation, the accumulated hot water of the reheating heat exchanger 4 heated to a high temperature due to the hot water supply single operation is ejected to the bathtub 22. Although there is a possibility that hot water is applied to the bather in the bathtub 22, as shown in this embodiment, when the hot water supply operation is performed during the heat insulation operation, the circulation pump 20 is driven to reheat the heat exchanger 4. Therefore, it is possible to avoid the problem that hot water is jetted into the bathtub 22 due to the single operation of hot water supply.
[0065]
In addition, this invention is not limited to the said embodiment, Various embodiment can be taken. For example, in the above-described embodiment, the catching prevention unit 44 captures the operation information of the combustion control unit 45 and detects the start of the filling operation based on the operation information, but captures the sensor output of the water level sensor 28. When the amount of change in the sensor output of the water level sensor 28 per unit time determined in advance becomes a value within a predetermined range, it is determined that the bath water level of the bathtub 22 is increased due to the hot water operation. It may be detected that has started.
[0066]
Further, the reheating prevention unit 44 detects the end of the filling operation based on the operation information of the combustion control unit 45. For example, the reheating prevention unit 44 takes in the sensor output of the water level sensor 28 and sets the water level sensor 28 per unit time set in advance. When the amount of change in the sensor output becomes almost zero, it may be detected that the hot water filling is finished.
[0071]
Furthermore, although the above embodiment has been described by taking a single can two water bath hot water heater as an example of the system configuration shown in FIG. 2, it may be a bath water heater having a hot water supply function and a hot water filling function in a single can two water channel type. For example, the present invention can be applied without being limited to the instrument of FIG.
[0072]
【The invention's effect】
According to the present invention, the chasing prevention unit is provided, and chasing operation is inhibited until the hot water at the set water level is filled after the hot water filling is started by the chasing prevention unit . Accordingly, since the independent operation reheating during water filling operation is not performed, the independent operation reheating during water filling operation is high temperature hot water supply problem due to be performed, i.e., the hot water supply is started during independent operation reheating Thus, it is possible to avoid the problem of high-temperature hot water supply in which hot water of a hot water supply heat exchanger heated to a high temperature due to a reheating independent operation gives the user of the discharged hot water hot water.
[0073]
Also, during water filling operation, the isolated operation reheating increase the bath hot water to a set temperature are carried out, the hot water of the hot water supply heat exchanger which is heated to a high temperature due to its Reheating isolated operation enhances the above set temperature The bath boiling temperature is higher than the set temperature because it is poured into the bath water, and the bath boiling temperature is different every time the hot water is filled even if the set temperature is the same. The problem of variation in rising temperature can be avoided.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment according to the present invention.
FIG. 2 is a model diagram showing an example of a single can / two water bath hot water heater.
FIG. 3 is a flowchart showing an example of automatic driving.
[Explanation of symbols]
2 Burner 3 Hot water supply heat exchanger 4 Reheating heat exchanger 13 Water supply passage 14 Hot water supply passage 20 Circulation pump 24 Reheating circulation passage 37 Bath temperature sensor 44 Reheating prevention portion 46 Pump drive control portion 48 Pump stop portion

Claims

給水通路から導かれた水を加熱し給湯通路に湯を供給する給湯熱交換器と、追い焚き循環通路に組み込まれる循環ポンプと、追い焚き循環通路に組み込まれ前記循環ポンプの駆動により追い焚き循環通路を循環する湯水を加熱する追い焚き熱交換器とを有し、上記給湯熱交換器と追い焚き熱交換器は一体化され、上記給湯熱交換器と追い焚き熱交換器を共通に加熱するバーナーが設けられ、上記給湯熱交換器で作られた湯を給湯通路を通して供給する給湯機能と、上記給湯熱交換器で作られた湯を浴槽に注湯して設定水位に自動的に湯を張る湯張り機能と、上記循環ポンプを駆動して浴槽湯水を上記追い焚き循環通路の追い焚き熱交換器を通して加熱し設定温度まで風呂の追い焚きを行う追い焚き機能とを備えた一缶二水路風呂給湯器において、湯張りが開始されてから浴槽に設定水位の湯が張られるまで追い焚きが行われるのを阻止する追い焚き阻止部が設けられていることを特徴とする一缶二水路風呂給湯器。 A hot water heat exchanger that heats water guided from the water supply passage and supplies hot water to the hot water supply passage, a circulation pump incorporated in the recirculation circulation passage, and recirculation by driving the circulation pump incorporated in the recirculation circulation passage A reheating heat exchanger that heats the hot water circulating in the passage, and the hot water heat exchanger and the reheating heat exchanger are integrated to heat the hot water heat exchanger and the reheating heat exchanger in common. A burner is provided, and a hot water supply function for supplying hot water made by the hot water heat exchanger through the hot water passage, and hot water made by the hot water heat exchanger is poured into the bathtub to automatically supply hot water to the set water level. One can two channels with a hot water filling function and a reheating function that drives the circulation pump to heat the bath water through the reheating heat exchanger in the recirculation passage and reheats the bath to the set temperature. Smell in bath water heater One can of two waterways bath water heater, wherein a blocking portion reheating to prevent the reheating after water filling is started until the hot water of the set water level in the bath is stretched is performed is provided.