JP3859828B2

JP3859828B2 - One can two water bath hot water heater

Info

Publication number: JP3859828B2
Application number: JP21821097A
Authority: JP
Inventors: 幸伸野口
Original assignee: 株式会社ガスター
Priority date: 1997-07-29
Filing date: 1997-07-29
Publication date: 2006-12-20
Anticipated expiration: 2017-07-29
Also published as: JPH1151465A

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とが一体化され、これら給湯熱交換器と追い焚き熱交換器とを共通に燃焼加熱するバーナが設けられている一缶二水路タイプの風呂給湯器に関するものである。
【０００２】
【従来の技術】
図２には一缶二水路風呂給湯器（器具）のモデル例が示されている。この器具は、器具ケース１内に燃焼室２を有し、この燃焼室２内にはバーナ３が設けられている。バーナ３には該バーナ３へ燃料ガスを導くためのガス供給通路４が接続され、このガス供給通路４には通路の開閉を行う電磁弁５，６と、弁開度によって燃料ガスの供給量を制御する比例弁８とが介設されている。
【０００３】
上記バーナ３の上方には給湯熱交換器１０が設けられ、この給湯熱交換器１０の入側には給水通路１１の一端側が接続され、給水通路１１の他端側は外部配管を介して水供給源に接続されている。給湯熱交換器１０の出側には給湯通路１２の一端側が接続され、給湯通路１２の他端側は外部配管を介して台所やシャワー等の給湯場所に連通されている。
【０００４】
上記給湯熱交換器１０の上側には追い焚き熱交換器１４が給湯熱交換器１０と一体的に設けられ、この追い焚き熱交換器１４の入側には戻り管１５の一端側が接続され、この戻り管１５の他端側は外部配管を介して浴槽１７に連通されており、追い焚き熱交換器１４の出側には通路１６の一端側が接続され、通路１６の他端側は循環ポンプ１８の吸入口に接続されている。循環ポンプ１８の吐出口には往管２０の一端側が接続され、往管２０の他端側は外部配管を介して浴槽１７に連通されている。上記戻り管１５と追い焚き熱交換器１４と通路１６と循環ポンプ１８と往管２０とにより浴槽１７の浴槽湯水を追い焚き循環させるための追い焚き循環通路２１が構成されている。
【０００５】
上記給湯通路１２と追い焚き循環通路２１を連通接続する湯張り通路２２が設けられており、この湯張り通路２２には通路の開閉を行う注湯制御弁２４が介設されている。
【０００６】
上記バーナ３よりも下方側の燃焼室２には燃焼ファン２５が介設された給気通路２６が連通接続されている。また、追い焚き熱交換器１４よりも上方側の燃焼室２にはバーナ３の燃焼によって生じた排気ガスを外部に送出するための排気通路２７が連通接続されている。
【０００７】
なお、図２に示す２８は給水通路１１を流れる通水流量を検出する水量センサを表し、３０は給水通路１１の湯水温度を検出する入水サーミスタを表し、３１は給湯熱交換器１０の出側の湯水温度を検出する給湯熱交換器温度検出手段としての給湯熱交サーミスタを表し、３２は浴槽水位を水圧により検出する水位センサを表し、３３は追い焚き循環通路２１の湯水温度を風呂温度として検出する風呂温度センサを表し、３４は追い焚き熱交換器１４の出側の湯水温度を検出する追い焚き循環通路温度検出手段としての追い焚き熱交サーミスタを表している。
【０００８】
この一缶二水路風呂給湯器には給湯や、湯張りや、追い焚きや、保温等の器具運転を制御する制御装置３５が設けられ、この制御装置３５にはリモコン３６が信号接続されている。リモコン３６には給湯温度を設定する給湯温度設定手段や、風呂の温度を設定する風呂温度設定手段や、風呂の水位を設定する水位設定手段等が設けられている。
【０００９】
上記制御装置３５は給湯運転を次のように制御する。例えば、台所やシャワー等の給湯栓（図示せず）が開栓され、水量センサ２８が予め定めた給湯運転作動流量以上の通水流量を検知すると、燃焼ファン２５の駆動を開始し給気通路２６を介してバーナ３に給気を供給すると共に、電磁弁５，６を開けてバーナ３に燃料ガスを供給し、バーナ３の燃焼を開始させ、給湯される湯の温度がリモコン３６に設定されている給湯設定温度となるようにバーナ３の燃焼熱量制御および燃焼ファン２５の回転制御を行い、給水通路１１から供給された水を給湯熱交換器１０がバーナ３の燃焼火炎の熱により加熱して湯を作り出し、その湯を給湯通路１２を介して給湯する。そして、給湯栓が閉められ、水量センサ２８が通水停止を検知したときに、電磁弁５，６を閉弁してバーナ３の燃焼を停止し、その後、予め定めた期間燃焼ファン２５の継続駆動を行わせ、次の給湯運転に備える。
【００１０】
また、湯張り運転を行うときには、注湯制御弁２４を開弁し、給湯熱交換器１０で上記同様に湯を作り出し、その湯を給湯通路１２と湯張り通路２２と追い焚き循環通路２１とを順に介して浴槽１７に注湯する。そして、水位センサ３２により検出される浴槽水位がリモコン３６に設定されている設定水位に達したときに、注湯制御弁２４を閉弁しバーナ３の燃焼を停止して湯張り運転を終了する。
【００１１】
さらに、追い焚き運転を行うときには、循環ポンプ１８を駆動し、浴槽１７から戻り管１５と追い焚き熱交換器１４と通路１６と循環ポンプ１８と往管２０とを順に介して浴槽１７に戻る追い焚き循環経路で浴槽湯水を循環させると共に、バーナ３を燃焼させ該バーナ３の燃焼火炎の熱によって追い焚き熱交換器１４で浴槽湯水の追い焚きを行い、風呂温度センサ３３により検出される風呂温度がリモコン３６に設定されている風呂設定温度に達したときにバーナ３の燃焼を停止し、また、循環ポンプ１８を停止して追い焚き運転を終了する。
【００１２】
さらに、保温機能が備えられている場合には、例えば、上記追い焚き運転の終了後、予め定めた時間間隔（例えば、３０分間隔）毎に循環ポンプ１８を駆動し、風呂温度センサ３３により風呂の温度を検出し、この検出した風呂の温度が風呂設定温度から予め定めた許容温度を越えて低いときには、バーナ３を燃焼させ、浴槽湯水の追い焚きを行って風呂の湯温を設定温度に高めて風呂の保温を行う。
【００１３】
【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では、上記の如く、給湯熱交換器１０と追い焚き熱交換器１４は一体化され、これら一体化した熱交換器は共通のバーナ３によって燃焼加熱されることから、追い焚き運転が行われておらず給湯運転のみが行われる給湯単独運転中には、追い焚き熱交換器１４に湯水が滞留しているのにも拘らず、バーナ３の給湯燃焼によって追い焚き熱交換器１４が加熱され、つまり、追い焚き熱交換器１４内の滞留湯水が加熱されて沸騰に近い状態になる場合がある。このように、給湯単独運転に起因して高温に加熱された追い焚き熱交換器１４内の湯が、給湯単独運転が終了した直後に、例えば、保温運転等によって循環ポンプ１８が駆動されて浴槽１７に噴出すると、浴槽１７に入浴者がいた場合には、その噴出した高温の湯が入浴者の体に当たり、火傷等の危害を与える虞があり、非常に危険である。
【００１４】
本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、給湯単独運転終了直後に循環ポンプが駆動することによる高温湯噴出の危険を防止できる一缶二水路風呂給湯器を提供することにある。
【００１５】
【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、供給された水を加熱して給湯する給湯熱交換器と、循環ポンプの駆動により追い焚き循環通路を介して供給された浴槽湯水を加熱して浴槽湯水の追い焚きを行う追い焚き熱交換器とが設けられ、また、上記追い焚き循環通路の湯水温度を検出する追い焚き循環通路温度検出手段と上記給湯熱交換器の湯水温度を検出する給湯熱交換器温度検出手段のうちの一方又は両方の温度検出手段が設けられており、上記給湯熱交換器と追い焚き熱交換器は一体化され、これら給湯熱交換器と追い焚き熱交換器を共通に燃焼加熱するバーナと、該バーナへ空気を供給する燃焼ファンとを備えた一缶二水路風呂給湯器において、給湯単独運転が終了した直後に循環ポンプ駆動指令が発せられたときには、燃焼ファンを駆動させ燃焼ファンの駆動による送風によって追い焚き熱交換器内の湯水を冷却する熱交換器湯温冷却制御部と；上記設けられている温度検出手段の少なくとも１つにより検出される湯温が追い焚き熱交換器内から浴槽へ高温湯噴出の虞がなくなったと判断するための予め定められたしきい値温度よりも低下するまで循環ポンプの駆動を禁止するポンプ駆動禁止制御部と；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。
【００１６】
第２の発明は、供給された水を加熱して給湯する給湯熱交換器と、循環ポンプの駆動により追い焚き循環通路を介して供給された浴槽湯水を加熱して浴槽湯水の追い焚きを行う追い焚き熱交換器とが設けられ、また、上記追い焚き循環通路の湯水温度を検出する追い焚き循環通路温度検出手段と上記給湯熱交換器の湯水温度を検出する給湯熱交換器温度検出手段のうちの一方又は両方の温度検出手段が設けられており、上記給湯熱交換器と追い焚き熱交換器は一体化され、これら給湯熱交換器と追い焚き熱交換器を共通に燃焼加熱するバーナと、該バーナへ空気を供給する燃焼ファンとを備えた一缶二水路風呂給湯器において、給湯単独運転が終了した直後に循環ポンプ駆動指令が発せられたときには、燃焼ファンを駆動させ燃焼ファンの駆動による送風によって追い焚き熱交換器内の湯水を冷却する熱交換器湯温冷却制御部と；上記設けられている温度検出手段の少なくとも１つに基づき追い焚き熱交換器内の湯温を推定検出する追い焚き熱交換器温度推定検出手段と；が設けられており、ポンプ駆動禁止制御部は、給湯単独運転が終了した直後に循環ポンプ駆動指令が発せられたときには、上記追い焚き熱交換器温度推定検出手段により検出される湯温が追い焚き熱交換器内から浴槽へ高温湯噴出の虞がなくなったと判断するための予め定めたしきい値温度よりも低下するまで循環ポンプの駆動を禁止する構成をもって前記課題を解決する手段としている。
【００１７】
第３の発明は、供給された水を加熱して給湯する給湯熱交換器と、循環ポンプの駆動により追い焚き循環通路を介して供給された浴槽湯水を加熱して浴槽湯水の追い焚きを行う追い焚き熱交換器とが設けられ、また、追い焚き熱交換器内の温度を検出する追い焚き熱交換器温度検出手段が設けられており、上記給湯熱交換器と追い焚き熱交換器は一体化され、これら給湯熱交換器と追い焚き熱交換器を共通に燃焼加熱するバーナと、該バーナへ空気を供給する燃焼ファンとを備えた一缶二水路風呂給湯器において、給湯単独運転が終了した直後に循環ポンプ駆動指令が発せられたときには、燃焼ファンを駆動させ燃焼ファンの駆動による送風によって追い焚き熱交換器内の湯水を冷却する熱交換器湯温冷却制御部と；上記追い焚き熱交換器温度検出手段により検出された湯温が追い焚き熱交換器内から浴槽へ高温湯噴出の虞がなくなったと判断するための予め定められたしきい値温度よりも低下するまで循環ポンプの駆動を禁止するポンプ駆動禁止制御部と；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。
【００１８】
第４の発明は、上記第１又は第２又は第３の発明の構成に加えて、ポンプ駆動禁止制御部により循環ポンプの駆動が禁止されているときには浴槽への高温湯吐出を回避するために循環ポンプが停止していることを報知する報知手段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。
【００１９】
上記構成の発明において、例えば、給湯単独運転が終了した直後に循環ポンプ駆動指令が発せられたときには、熱交換器湯温冷却制御部は、燃焼ファンを駆動させて追い焚き熱交換器に風を送る。この送風によって追い焚き熱交換器および該追い焚き熱交換器内の湯は冷却される。また、ポンプ駆動禁止制御部は、給湯熱交換器温度検出手段により検出される湯温が予め定めたしきい値温度（つまり、追い焚き熱交換器内の湯温が浴槽への高温湯噴出の虞がなくなったと給湯熱交換器温度検出手段の検出湯温に基づいて推定できる温度）よりも低下するまで、循環ポンプの駆動を禁止する。
【００２０】
浴槽に噴出しても危険のない温度に追い焚き熱交換器内の湯温が低下するまで循環ポンプの駆動を禁止することができることから、給湯単独運転に起因して高温に加熱された追い焚き熱交換器内の湯が循環ポンプの駆動によって浴槽に噴出するという問題が回避される。また、燃焼ファンの駆動による送風によって追い焚き熱交換器内の湯の冷却が促進されるので、追い焚き熱交換器内の湯が浴槽に噴出しても安全な湯温に低下するまでに多くの時間を要せず、循環ポンプの禁止時間は短くて済む。
【００２１】
【発明の実施の形態】
以下に、この発明に係る実施形態例を図面に基づき説明する。
【００２２】
第１の実施形態例の一缶二水路風呂給湯器は図２に示すシステム構成を有し、特徴的なことは、給湯単独運転に起因して高温に加熱された追い焚き熱交換器内の湯が、給湯単独運転が終了した直後に循環ポンプの駆動によって浴槽に噴出するのを防止する制御構成を備えたことである。なお、図２の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。
【００２３】
この実施形態例では、制御装置３５は、図１の実線に示すように、燃焼制御部４０と熱交換器湯温冷却制御部４１と給湯単独運転監視部４２とポンプ駆動禁止制御部４３とを有して構成されている。
【００２４】
燃焼制御部４０には給湯や湯張りや追い焚きや保温等の器具運転を行うためのシーケンスプログラムが予め定め与えられており、燃焼制御部４０は、水量センサ２８等の各種のセンサ出力の情報と、給湯設定温度等のリモコン３６の情報とを時々刻々と取り込み、これら取り込んだ情報に基づき上記シーケンスプログラムに従って器具運転を前述したように制御する。
【００２５】
給湯単独運転監視部４２は上記燃焼制御部４０の動作情報を取り込み、給湯単独運転が行われているか否かを監視する。すなわち、循環ポンプ１８が停止し注湯制御弁２４が閉弁している状態で、バーナ３の燃焼火炎がフレームロッド電極（図示せず）等により検知されているとき（又は、水量センサ２８により通水が検知されているとき）には、給湯単独運転が行われていると判断し、それ以外のときには給湯単独運転は行われていないと判断する。
【００２６】
熱交換器湯温冷却制御部４１は燃焼制御部４０の動作情報と、給湯単独運転監視部４２の監視情報とを時々刻々と取り込み、これら取り込んだ情報に基づき、給湯単独運転が終了した直後に保温運転や追い焚き運転等によって循環ポンプ１８の駆動指令が発せられたことを検知したときには、燃焼ファン２５を予め定めた回転数（例えば、予め定めた最大燃焼熱量でバーナ３を燃焼させるときのファン回転数（又はファン風量））でもって回転駆動させる。
【００２７】
この燃焼ファン２５の駆動によって、ほぼ給気温度の送風が給湯熱交換器１０および追い焚き熱交換器１４に吹き付けられ、給湯燃焼により加熱された給湯熱交換器１０および追い焚き熱交換器１４の熱量がファン送風により奪われて追い焚き熱交換器１４内の湯の冷却が促進される。通常、バーナ３の燃焼を停止させた後には、引き続き燃焼ファン２５を予め定めた時間（例えば、５分間）継続駆動させ、燃焼室２内の排気ガスを排出するポストパージが行われるが、このポストパージ中の送風量は非常に少なく、このために、ポストパージ中の送風によって追い焚き熱交換器１４内の湯の冷却促進の効果は殆ど得られない。
【００２８】
この実施形態例では、給湯単独運転終了直後に循環ポンプ１８の駆動指令が発せられたときに、燃焼ファン２５の駆動による送風によって、追い焚き熱交換器１４内の湯を効果的に冷却することが可能なファン回転数（又はファン風量）を予め定めておき、上記の如く、熱交換器湯温冷却制御部４１は、給湯単独運転が終了した直後に循環ポンプ１８の駆動指令が発せられたときには、上記予め定めた回転数（ファン風量）でもって燃焼ファン２５を駆動させ、追い焚き熱交換器１４の湯を効果的に冷却する。
【００２９】
ポンプ駆動禁止制御部４３は、給湯単独運転が終了した直後に循環ポンプ１８の駆動指令が発せられたときに、給湯単独運転により高温に加熱された追い焚き熱交換器１４内の湯が浴槽１７に噴出しても入浴者に火傷等の危害を加える虞がなくなる温度に低下するまで、循環ポンプ１８の駆動を禁止する構成を有している。
【００３０】
ところで、追い焚き熱交換器１４内の湯温は、追い焚き熱交サーミスタ３４により検出される湯温Ｔhoに基づき、推定することが可能である。また、給湯熱交換器１０と追い焚き熱交換器１４は一体化していることから、給湯熱交換器１０と追い焚き熱交換器１４間で熱量の遣り取りが行われるので、給湯熱交換器１０側の湯温（つまり、給湯熱交サーミスタ３１により検出される湯温Ｔko）に基づき追い焚き熱交換器１４内の湯温を推定検出することが可能である。
【００３１】
このことから、この実施形態例では、上記給湯熱交サーミスタ３１により検出される湯温Ｔkoと、追い焚き熱交サーミスタ３４により検出される湯温Ｔhoとに基づき、ポンプ駆動禁止制御部４３は、給湯単独運転終了後に循環ポンプ１８の駆動指令が発せられたときには、追い焚き熱交換器１４内の湯が高温湯噴出の危険な温度であるか否かを判断し、追い焚き熱交換器１４内の湯が高温湯噴出の虞がない温度に低下するまで、循環ポンプ１８の駆動を禁止する構成にした。
【００３２】
具体的には、給湯熱交サーミスタ３１により検出される湯温Ｔkoに対するしきい値温度Ｔksと、追い焚き熱交サーミスタ３４により検出される湯温Ｔhoに対するしきい値温度Ｔhsとを次に示すように予め求めてポンプ駆動禁止制御部４３に与えておく。浴槽１７への高温湯噴出の虞があるか否かを判断するための追い焚き熱交換器１４内の湯温Ｔsp（例えば、６０℃）は予め定めることができ、給湯単独運転終了後の循環ポンプ１８の停止中に（つまり、追い焚き循環通路２１に湯水が滞留している状態で）、追い焚き熱交換器１４内の湯が上記湯温Ｔspであるときに追い焚き熱交サーミスタ３４により検出される温度Ｔhsを予め実験や演算等によって求め、この求めた温度Ｔhsを追い焚き熱交サーミスタ３４の検出湯温Ｔhoに対するしきい値温度として、ポンプ駆動禁止制御部４３に与えておく。
【００３３】
また、給湯単独運転終了後に給湯熱交換器１０内に湯水が滞留している状態で、追い焚き熱交換器１４内の湯が上記湯温Ｔspであるときに給湯熱交サーミスタ３１により検出される湯温Ｔksを予め実験や演算等によって求め、この求めた湯温Ｔksを給湯熱交サーミスタ３１の検出湯温Ｔkoに対するしきい値温度としてポンプ駆動禁止制御部４３に与えておく。
【００３４】
もちろん、上記しきい値温度Ｔks，Ｔhsを求める際には、給湯熱交換器１０と追い焚き熱交換器１４の缶体の大きさや、給湯熱交換器１０と給湯熱交サーミスタ３１の配設位置との間の間隔や、追い焚き熱交換器１４とポンプ駆動禁止制御部４３の配設位置との間の間隔等が考慮されて求められる。
【００３５】
ポンプ駆動禁止制御部４３は上記燃焼制御部４０の動作情報と、給湯単独運転監視部４２の監視情報と、給湯熱交サーミスタ３１により検出される湯温情報と、追い焚き熱交サーミスタ３４により検出される湯温情報とを時々刻々取り込み、取り込む度に上記給湯熱交サーミスタ３１の検出湯温Ｔkoを上記対応するしきい値温度Ｔksに比較し、また、追い焚き熱交サーミスタ３４の検出湯温Ｔhoを上記対応するしきい値温度Ｔhsに比較し、上記燃焼制御部４０と給湯単独運転監視部４２の情報に基づき給湯単独運転が終了した直後に循環ポンプ１８の駆動指令が発せられたと検知したときに、給湯熱交サーミスタ３１の検出湯温Ｔkoがしきい値温度Ｔks以上であるか、又は、追い焚き熱交サーミスタ３４の検出湯温Ｔhoがしきい値温度Ｔhs以上であるときには、追い焚き熱交換器１４内の湯は浴槽１７に噴出すると入浴者に火傷等の危害を加える虞がある湯温であると判断し、この状態で循環ポンプ１８の駆動を開始すると前記高温湯噴出の危険があると判断して、循環ポンプ１８の駆動開始を禁止させるためのポンプ駆動禁止信号を燃焼制御部４０に出力し、燃焼制御部４０による循環ポンプ１８の駆動開始動作を延期させる。
【００３６】
ポンプ駆動禁止制御部４３は、引き続き給湯熱交サーミスタ３１の検出湯温Ｔkoと追い焚き熱交サーミスタ３４の検出湯温Ｔhoの取り込みを時々刻々と行い、給湯熱交サーミスタ３１の検出湯温Ｔkoと追い焚き熱交サーミスタ３４の検出湯温Ｔhoの両方がそれぞれ対応するしきい値温度Ｔks，Ｔhsよりも低下するまで、ポンプ駆動禁止信号の出力を継続して行い、循環ポンプ１８の駆動禁止状態を続けさせる。換言すれば、給湯熱交サーミスタ３１の検出湯温Ｔkoと追い焚き熱交サーミスタ３４の検出湯温Ｔhoの両方がそれぞれ対応するしきい値温度Ｔks，Ｔhsよりも低下したときに、追い焚き熱交換器１４内の湯温は浴槽への高温湯噴出の危険がない安全な湯温に低下したと判断でき、燃焼制御部４０は、上記ポンプ駆動禁止制御部４３からの継続的なポンプ駆動禁止信号の出力が停止したときに、循環ポンプ１８の駆動を開始する。
【００３７】
また、ポンプ駆動禁止制御部４３は、ポンプ駆動禁止信号の出力を停止したときに、空冷停止信号を熱交換器湯温冷却制御部４１に出力し、熱交換器湯温冷却制御部４１による燃焼ファン２５の回転制御を終了させる。
【００３８】
この実施形態例によれば、給湯単独運転が終了した直後に循環ポンプ１８の駆動指令が発せられたときには、給湯熱交サーミスタ３１の検出湯温Ｔkoと追い焚き熱交サーミスタ３４の検出湯温Ｔhoとに基づき、追い焚き熱交換器１４内の湯が浴槽１７への高温湯噴出の危険がない湯温に低下したと判断されるまで、ポンプ駆動禁止制御部４３によって循環ポンプ１８の駆動が禁止されるので、給湯単独運転終了直後の循環ポンプ１８の駆動に起因した高温湯噴出の問題、つまり、給湯単独運転に起因して高温に加熱された追い焚き熱交換器１４内の湯が給湯単独運転終了直後の循環ポンプ１８の駆動により浴槽１７に噴出して入浴者に火傷等の危害を加える虞があるという問題を確実に回避することができる。
【００３９】
また、上記の如く、給湯熱交サーミスタ３１と追い焚き熱交サーミスタ３４により検出される湯温に基づいて、ポンプ駆動禁止制御部４３による循環ポンプ１８の駆動禁止制御が行われるので、追い焚き熱交換器１４内の湯が高温であるのに循環ポンプ１８の駆動禁止制御が終了して循環ポンプ１８の駆動が開始されてしまい上記高温湯噴出の問題が生じたり、追い焚き熱交換器１４内の湯が十分安全な湯温に低下したのにも拘らず、循環ポンプ１８の駆動禁止制御が継続され、無駄な禁止時間があるというような問題が回避できる適切なタイミングで循環ポンプ１８の駆動禁止制御を終了させ循環ポンプ１８の駆動開始を行わせることが可能である。
【００４０】
その上、熱交換器湯温冷却制御部４１を設け、給湯単独運転が終了した直後に循環ポンプ１８の駆動指令が発せられたときには、熱交換器湯温冷却制御部４１により燃焼ファン２５を駆動させ、ファン送風によって追い焚き熱交換器１４の湯の冷却を促進するので、追い焚き熱交換器１４内の湯が浴槽１７への高温湯噴出の虞がない湯温に低下するまでの時間を短縮することができる。このことから、上記ポンプ駆動禁止制御部４３による循環ポンプ１８の駆動禁止時間の短縮を図ることができる。
【００４１】
以下に、第２の実施形態例を説明する。この実施形態例では、図１の鎖線に示す追い焚き熱交換器温度推定検出手段４４を設け、該追い焚き熱交換器温度推定検出手段４４によって追い焚き熱交換器１４内の湯温を演算等によって推定検出し、この追い焚き熱交換器温度推定検出手段４４により推定検出された追い焚き熱交換器１４の湯温に基づき、ポンプ駆動禁止制御部４３による循環ポンプ１８の駆動禁止制御が行われることを特徴としており、それ以外の構成は前記第１の実施形態例と同様であり、その共通部分の重複説明は省略する。
【００４２】
追い焚き熱交換器温度推定検出手段４４には、給湯熱交サーミスタ３１により検出される湯温Ｔkoと追い焚き熱交サーミスタ３４により検出される湯温Ｔhoとの一方又は両方に基づいて追い焚き熱交換器１４内の湯温を推定検出するための湯温推定検出データがグラフデータや演算式データや表データのデータ形式で予め定め与えられており、追い焚き熱交換器温度推定検出手段４４は、給湯熱交サーミスタ３１の検出湯温Ｔko又は追い焚き熱交サーミスタ３４の検出湯温Ｔhoを時々刻々と取り込み、これら取り込んだ湯温と上記湯温推定検出データとに基づいて追い焚き熱交換器１４内の湯温を推定検出し、追い焚き熱交換器１４内の湯温を推定検出する度に、その推定検出した追い焚き熱交換器１４内の湯温Ｔhfの情報をポンプ駆動禁止制御部４３に出力する。
【００４３】
ポンプ駆動禁止制御部４３には、追い焚き熱交換器１４内の湯が浴槽１７へ噴出すると入浴者に火傷等の危害を加える虞がある温度であるか否かを判断するためのしきい値温度Ｔspが予め与えられており、ポンプ駆動禁止制御部４３は、推定検出された追い焚き熱交換器１４内の湯温Ｔhfを上記追い焚き熱交換器温度推定検出手段４４から受け取る度に、その推定湯温Ｔhfを上記しきい値温度Ｔspに比較し、上記推定検出湯温Ｔhfがしきい値温度Ｔsp以上であるときには高温湯噴出の危険の虞があると判断し、このように高温湯噴出の虞があると判断されている状態で、給湯単独運転が終了した直後に循環ポンプ１８の駆動指令が発せられたときには、上記第１の実施形態例同様に、ポンプ駆動禁止信号を燃焼制御部４０に出力して循環ポンプ１８の駆動開始を延期させる。
【００４４】
そして、ポンプ駆動禁止制御部４３は、引き続き追い焚き熱交換器温度推定検出手段４４により検出される追い焚き熱交換器１４の推定検出温度Ｔhfを上記しきい値温度Ｔspに比較する動作を行い、推定検出温度Ｔhfがしきい値温度Ｔspよりも低下し上記高温湯噴出の虞がないと判断されるまでポンプ駆動禁止信号の出力を継続して行う。燃焼制御部４０は、前記第１の実施形態例と同様に、上記ポンプ駆動禁止制御部４３により高温湯噴出の虞がなくなったと判断されるまで、循環ポンプ１８の駆動を延期し、つまり、高温湯噴出の虞がなくなったと判断されたときに循環ポンプ１８の駆動を開始させる。
【００４５】
第２の実施形態例によれば、追い焚き熱交換器１４内の湯温を推定検出する追い焚き熱交換器温度推定検出手段４４を設け、給湯単独運転が終了した直後に循環ポンプ１８の駆動指令が発せられたときには、追い焚き熱交換器温度推定検出手段４４により検出された追い焚き熱交換器１４内の推定湯温Ｔhfが高温湯噴出の虞がないと判断できるしきい値温度Ｔspよりも低下するまで、循環ポンプ１８の駆動を禁止するので、前記第１の実施形態例と同様に、浴槽１７への高温湯噴出の問題を確実に回避することができる。もちろん、この実施形態例においても、前記第１の実施形態例と同様に、給湯単独運転が終了した直後に循環ポンプ１８の駆動指令が発せられたときには、熱交換器湯温冷却制御部４１によって燃焼ファン２５の回転駆動が行われるので、追い焚き熱交換器１４の湯の冷却が促進され、循環ポンプ１８の駆動禁止時間の短縮を図ることができるという効果を奏することができる。
【００４６】
以下に、第３の実施形態例を説明する。この実施形態例において特徴的なことは、図２の破線に示すように、追い焚き熱交換器１４内の湯温を直接的に検出する追い焚き熱交換器温度検出手段としての追い焚き熱交温度センサ３８が設けられており、この追い焚き熱交温度センサ３８により検出された湯温に基づいて、ポンプ駆動禁止制御部４３が循環ポンプ１８の駆動禁止制御を行う構成としたことを特徴としている。それ以外の構成は前記各実施形態例と同様であり、その共通部分の重複説明は省略する。
【００４７】
ポンプ駆動禁止制御部４３には前記しきい値温度Ｔspが予め定め与えられており、ポンプ駆動禁止制御部４３は、追い焚き熱交温度センサ３８により検出される追い焚き熱交換器１４内の湯温を時々刻々と取り込み、追い焚き熱交温度センサ３８の検出湯温を取り込む度に、追い焚き熱交温度センサ３８の検出湯温を上記しきい値温度Ｔspに比較し、上記追い焚き熱交温度センサ３８の検出湯温がしきい値温度Ｔsp以上であるときには、浴槽１７への高温湯噴出の危険があると判断し、このように、高温湯噴出の危険があると判断されている状態で、給湯単独運転が終了した直後に循環ポンプ１８の駆動指令が発せられたときには、燃焼制御部４０へポンプ駆動禁止信号を出力し、燃焼制御部４０による循環ポンプ１８の駆動開始を延期させる。
【００４８】
そして、ポンプ駆動禁止制御部４３は、引き続き追い焚き熱交温度センサ３８の検出湯温を取り込み、追い焚き熱交温度センサ３８の検出湯温をしきい値温度Ｔspに比較して、追い焚き熱交温度センサ３８の検出湯温がしきい値温度Ｔspよりも低下するまでポンプ駆動禁止信号を継続して出力し、循環ポンプ１８の駆動待機状態を継続させる。つまり、追い焚き熱交温度センサ３８の検出湯温がしきい値温度Ｔspよりも低下したときに、浴槽１７への高温湯噴出の虞がないと判断され、循環ポンプ１８の駆動を開始させる。
【００４９】
この第３の実施形態例によれば、追い焚き熱交換器１４内の湯温を直接的に検出する追い焚き熱交温度センサ３８を設け、給湯単独運転が終了した直後に循環ポンプ１８の駆動指令が発せられたときには、上記追い焚き熱交温度センサ３８により検出される湯温に基づき、循環ポンプ１８の駆動禁止制御を行うので、追い焚き熱交換器１４内の湯温を推定検出する場合に比べて、より正確な追い焚き熱交換器１４内の湯温を検出することができ、給湯単独運転終了直後に循環ポンプ１８の駆動指令が発せられたときには、高温湯噴出の問題を回避できるのはもちろんのこと、より一層適切なタイミングで循環ポンプ１８の駆動を開始させることができる。
【００５０】
なお、この発明は上記各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、上記第１又は第２の実施形態例では、給湯熱交サーミスタ３１により検出される湯温Ｔkoと追い焚き熱交サーミスタ３４により検出される湯温Ｔhoとの両方に基づき、ポンプ駆動禁止制御部４３による循環ポンプ１８の駆動禁止制御が行われたが、ポンプ駆動禁止制御部４３は、上記給湯熱交サーミスタ３１の検出湯温Ｔkoと追い焚き熱交サーミスタ３４の検出湯温Ｔhoのうちのどちらか一方の検出湯温だけに基づいて、循環ポンプ１８の禁止制御を行うようにしてもよい。
【００５１】
また、上記第１又は第２の実施形態例では、給湯熱交サーミスタ３１を給湯熱交換器温度検出手段とし、この給湯熱交サーミスタ３１により検出される湯温Ｔkoを利用して、ポンプ駆動禁止制御部４３は循環ポンプ１８の駆動禁止制御を行っていたが、図２の点線に示すように、給湯熱交換器１０内の湯温を検出する給湯熱交温度センサ３７を給湯熱交換器１０の中間位置（例えば、Ｕ字管）に設け、この給湯熱交温度センサ３７を給湯熱交換器温度検出手段として機能させ、ポンプ駆動禁止制御部４３は上記給湯熱交温度センサ３７により検出される湯温を利用して循環ポンプ１８の駆動禁止制御を行うようにしてもよい。
【００５２】
さらに、上記各実施形態例では、熱交換器湯温冷却制御部４１により燃焼ファン２５の駆動が行われるときには、ポストパージによる燃焼ファン２５の回転数（ファン風量）よりも多い回転数（ファン風量）でもって燃焼ファン２５を駆動させていたが、ポストパージ中のファン回転数（ファン風量）とほぼ等しいファン回転数（ファン風量）で燃焼ファン２５の回転駆動を行わせてもよい。この場合には、ファン送風による追い焚き熱交換器１４の冷却作用の効果は上記各実施形態例よりも劣ってしまうが、追い焚き熱交換器１４内の湯が高温湯噴出の虞がなくなる温度に低下するまで、ポンプ駆動禁止制御部４３によって循環ポンプ１８の駆動が禁止されているので、給湯単独運転終了直後の循環ポンプ１８の駆動に起因した高温湯噴出の問題を確実に回避することができる。
【００５３】
さらに、上記各実施形態例に示した制御構成に加えて、ポンプ駆動禁止制御部４３によって循環ポンプ１８の駆動が禁止されているときには浴槽１７への高温湯吐出を回避するために循環ポンプ１８の駆動が停止していることを報知する次に示すような報知手段をリモコン３６等に設けてもよい。例えば、報知手段は、ポンプ駆動禁止制御部４３により循環ポンプ１８が停止しているときに点灯するランプや、ポンプ駆動禁止制御部４３により循環ポンプ１８が停止していることを示す記号や文字を表示する表示部等により形成される。
【００５４】
さらに、上記各実施形態例は図２に示す一缶二水路風呂給湯器を例にして説明したが、この発明は、一缶二水路タイプの風呂給湯器であれば適用することができる。例えば、図２に示す一缶二水路風呂給湯器では、追い焚き熱交換器１４の出側に追い焚き熱交サーミスタ３４が設けられていたが、この発明は、追い焚き熱交サーミスタ３４が設けられていない一缶二水路給湯器にも適用することができ、この場合には、風呂温度センサ３３を追い焚き循環通路温度検出手段として機能させてもよいし、追い焚き側の湯温を使用せずに、給湯側の温度センサにより検出される温度だけを利用して、ポンプ駆動禁止制御部４３による循環ポンプ駆動禁止制御を行うようにしてもよい。また、上記図２に示す例では、循環ポンプ１８は追い焚き熱交換器１４の出側よりも下流側に設けられていたが、追い焚き熱交換器１４の入側の戻り管１５に循環ポンプ１８を設けてもよい。
【００５５】
【発明の効果】
この発明によれば、給湯単独運転が終了した直後に循環ポンプ駆動指令が発せられたときに、追い焚き循環通路温度検出手段により検出される湯温、又は、給湯熱交換器温度検出手段により検出される湯温、又は、追い焚き熱交換器内の温度を推定検出した湯温、又は、追い焚き熱交換器温度検出手段により直接的に検出された湯温に基づき、追い焚き熱交換器内の湯が浴槽への高温湯噴出の虞がない温度に低下したと判断されるまで、ポンプ駆動禁止制御部によって循環ポンプの駆動を禁止する構成にしたので、給湯単独運転に起因して高温に加熱された追い焚き熱交換器内の湯が、給湯単独運転の終了直後に循環ポンプの駆動によって浴槽へ噴出することはなく、給湯単独運転の終了直後に追い焚き熱交換器内の高温湯が浴槽へ噴出して入浴者に当たり火傷等の危害を与えるという問題を確実に回避することができる。
【００５６】
また、追い焚き熱交換器内の湯温を直接的又は間接的に検出し、この検出された湯温に基づき、ポンプ駆動禁止制御部による循環ポンプの駆動禁止制御が行われるので、給湯単独運転の終了後、高温湯噴出の虞がなくなったと判断できる温度まで追い焚き熱交換器内の湯が冷却したときに、つまり、追い焚き熱交換器内の湯が冷めていないのに循環ポンプの駆動禁止制御が終了して循環ポンプが駆動し、その追い焚き熱交換器内の高温の湯が浴槽へ噴出してしまったり、追い焚き熱交換器内の湯が十分冷却されているのに循環ポンプの駆動禁止制御が継続して行われ、無駄なポンプ駆動禁止時間が生じるという問題を回避できる適切なタイミングで循環ポンプの駆動禁止制御が終了し循環ポンプを駆動させることができる。
【００５７】
その上、この発明では、熱交換器湯温冷却制御部を設け、給湯単独運転が終了した直後に循環ポンプ駆動指令が発せられたときには、上記熱交換器湯温冷却制御部によって燃焼ファンが駆動するので、このファン通風によって、追い焚き熱交換器内の湯の冷却を促進することができ、給湯単独運転が終了してから、追い焚き熱交換器内の湯が高温湯噴出の虞がない温度に低下するまでの時間が短縮され、上記ポンプ駆動禁止制御部による循環ポンプ駆動禁止時間を短くすることができる。
【００５８】
ポンプ駆動禁止制御部により循環ポンプの駆動が禁止されているときには浴槽への高温湯吐出を回避するために循環ポンプが停止していることを報知する報知手段が設けられている構成を備えたものにあっては、例えば、一缶二水路風呂給湯器の利用者が追い焚き開始を指令したのにも拘らず循環ポンプ駆動が開始して追い焚きが開始されないと、利用者が循環ポンプ等の異常ではないかと危惧する虞があるが、上記の如く報知手段を設けて、ポンプ駆動禁止制御部により循環ポンプが停止しているのは浴槽への高温湯吐出を回避するためであり、異常でないはないことを報知手段によって報知することができ、利用者に不要な危惧を与えるの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モデル例を示す説明図である。
【符号の説明】
３バーナ
１０給湯熱交換器
１４追い焚き熱交換器
１７浴槽
１８循環ポンプ
２１追い焚き循環通路
２５燃焼ファン
３１給湯熱交サーミスタ
３４追い焚き熱交サーミスタ
３７給湯熱交温度センサ
３８追い焚き熱交温度センサ
４１熱交換器湯温冷却制御部
４３ポンプ駆動禁止制御部
４４追い焚き熱交換器温度推定検出手段[0001]
BACKGROUND OF THE INVENTION
The present invention is a one-can two-water channel type in which a hot water supply heat exchanger and a reheating heat exchanger are integrated, and a burner is provided for combustion heating the hot water supply heat exchanger and the reheating heat exchanger in common. It relates to bath water heaters.
[0002]
[Prior art]
FIG. 2 shows a model example of a single can two water bath hot water heater (equipment). This instrument has a combustion chamber 2 in an instrument case 1, and a burner 3 is provided in the combustion chamber 2. A gas supply passage 4 for introducing fuel gas to the burner 3 is connected to the burner 3. The gas supply passage 4 has electromagnetic valves 5 and 6 for opening and closing the passage, and the amount of fuel gas supplied depending on the valve opening degree. And a proportional valve 8 for controlling.
[0003]
A hot water supply heat exchanger 10 is provided above the burner 3. One end side of the water supply passage 11 is connected to the inlet side of the hot water supply heat exchanger 10, and the other end side of the water supply passage 11 is connected to water via an external pipe. Connected to the supply source. One end side of the hot water supply passage 12 is connected to the outlet side of the hot water supply heat exchanger 10, and the other end side of the hot water supply passage 12 is communicated with a hot water supply place such as a kitchen or a shower through an external pipe.
[0004]
A reheating heat exchanger 14 is provided integrally with the hot water supply heat exchanger 10 on the upper side of the hot water supply heat exchanger 10, and one end side of the return pipe 15 is connected to the inlet side of the reheating heat exchanger 14, The other end side of the return pipe 15 communicates with the bathtub 17 via an external pipe, and one end side of the passage 16 is connected to the outlet side of the reheating heat exchanger 14, and the other end side of the passage 16 is a circulation pump. 18 inlets are connected. One end side of the outgoing pipe 20 is connected to the discharge port of the circulation pump 18, and the other end side of the outgoing pipe 20 is communicated with the bathtub 17 via an external pipe. The return pipe 15, the reheating heat exchanger 14, the passage 16, the circulation pump 18, and the outgoing pipe 20 constitute a recirculation circulation passage 21 for replenishing and circulating the hot water in the bathtub 17.
[0005]
A hot water filling passage 22 that connects the hot water supply passage 12 and the recirculation circulation passage 21 is provided, and a hot water filling control valve 24 that opens and closes the passage is interposed in the hot water filling passage 22.
[0006]
An air supply passage 26 in which a combustion fan 25 is interposed is connected to the combustion chamber 2 below the burner 3. Further, an exhaust passage 27 for communicating exhaust gas generated by the combustion of the burner 3 to the outside is connected to the combustion chamber 2 above the reheating heat exchanger 14.
[0007]
2 represents a water amount sensor for detecting the flow rate of water flowing through the water supply passage 11, 30 represents a water thermistor for detecting the hot water temperature in the water supply passage 11, and 31 represents the outlet side of the hot water heat exchanger 10. 2 represents a hot water heat exchanger thermistor as a hot water heat exchanger temperature detecting means for detecting the hot water temperature of the hot water, 32 represents a water level sensor for detecting the bathtub water level by water pressure, and 33 represents the hot water temperature of the recirculation circulation passage 21 as the bath temperature. Reference numeral 34 denotes a bath temperature sensor to be detected. Reference numeral 34 denotes a reheating heat exchange thermistor as a recirculation circulation passage temperature detecting means for detecting the hot water temperature on the outlet side of the reheating heat exchanger 14.
[0008]
This one-can two-water bath water heater is provided with a control device 35 for controlling the operation of appliances such as hot water supply, hot water filling, chasing, and heat insulation, and a remote control 36 is connected to the control device 35 as a signal. . The remote controller 36 is provided with hot water supply temperature setting means for setting the hot water supply temperature, bath temperature setting means for setting the bath temperature, water level setting means for setting the bath water level, and the like.
[0009]
The control device 35 controls the hot water supply operation as follows. For example, when a hot water tap (not shown) such as a kitchen or a shower is opened and the water amount sensor 28 detects a water flow rate that is equal to or higher than a predetermined hot water supply operation flow rate, the combustion fan 25 starts to be driven and the air supply passage In addition to supplying air supply to the burner 3 via 26, the solenoid valves 5 and 6 are opened to supply fuel gas to the burner 3, combustion of the burner 3 is started, and the temperature of hot water to be supplied is set in the remote controller 36. The combustion heat amount control of the burner 3 and the rotation control of the combustion fan 25 are controlled so that the set hot water supply temperature is reached, and the hot water supply heat exchanger 10 heats the water supplied from the water supply passage 11 by the heat of the combustion flame of the burner 3. Then, hot water is produced, and the hot water is supplied through the hot water supply passage 12. When the hot water tap is closed and the water amount sensor 28 detects the stoppage of water flow, the solenoid valves 5 and 6 are closed to stop the combustion of the burner 3, and then the combustion fan 25 is continued for a predetermined period. Drive to prepare for the next hot water supply operation.
[0010]
In addition, when performing the hot water filling operation, the hot water control valve 24 is opened, hot water is produced in the hot water supply heat exchanger 10 in the same manner as described above, and the hot water is supplied to the hot water supply passage 12, the hot water filling passage 22, the recirculation circulation passage 21, and the like. The hot water is poured into the bathtub 17 in order. When the bathtub water level detected by the water level sensor 32 reaches the set water level set in the remote controller 36, the hot water control valve 24 is closed, the combustion of the burner 3 is stopped, and the hot water filling operation is finished. .
[0011]
Further, when the reheating operation is performed, the circulation pump 18 is driven, and the return pump 15, the reheating heat exchanger 14, the passage 16, the circulation pump 18, and the outgoing tube 20 are sequentially returned from the bathtub 17 to the bathtub 17. Bath water is circulated through the water circulation path, the burner 3 is combusted, the heat of the combustion flame of the burner 3 is reheated, the hot water in the bathtub is reheated, and the bath temperature sensor 33 detects the bath temperature. When the temperature reaches the bath set temperature set in the remote controller 36, the combustion of the burner 3 is stopped, and the circulation pump 18 is stopped to end the reheating operation.
[0012]
Further, in the case where a heat retaining function is provided, for example, after completion of the chasing operation, the circulation pump 18 is driven every predetermined time interval (for example, every 30 minutes), and the bath temperature sensor 33 is used for bathing. When the detected bath temperature is lower than the predetermined allowable temperature from the bath set temperature, the burner 3 is burned and the bath water is reheated to bring the bath temperature to the set temperature. Increase the temperature of the bath.
[0013]
[Problems to be solved by the invention]
By the way, in the single can two water bath hot water heater, as described above, the hot water supply heat exchanger 10 and the reheating heat exchanger 14 are integrated, and these integrated heat exchangers are combusted and heated by the common burner 3. Therefore, during the hot water supply alone operation in which the reheating operation is not performed and only the hot water supply operation is performed, the hot water is retained in the reheating heat exchanger 14, but the hot water is burnt by the burner 3. The soaking heat exchanger 14 is heated, that is, the accumulated hot water in the reheating heat exchanger 14 may be heated to a state close to boiling. As described above, the hot water in the reheating heat exchanger 14 heated to a high temperature due to the single hot water supply operation is immediately after the single hot water supply operation is completed, and the circulation pump 18 is driven by, for example, the heat insulation operation, so that the bathtub If there is a bather in the bathtub 17, the hot water blown out hits the body of the bather and may cause burns and other injuries, which is very dangerous.
[0014]
The present invention has been made in order to solve the above-mentioned problems, and its object is to provide a single can two water bath hot water heater capable of preventing the danger of high temperature hot water jetting due to the circulation pump being driven immediately after the completion of the hot water single operation. There is to do.
[0015]
[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-mentioned problems. That is, the first invention heats the supplied water and supplies hot water, and the hot water supplied through the recirculation passage by driving the circulation pump to reheat the hot water from the bathtub. Reheating heat exchanger for performing reheating, and reheating circulation passage temperature detecting means for detecting the hot water temperature of the recirculation circulation passage. When Hot water supply heat exchanger temperature detecting means for detecting the hot water temperature of the hot water supply heat exchanger Temperature detection means for one or both of The hot water supply heat exchanger and the reheating heat exchanger are integrated, a burner for commonly heating the hot water supply heat exchanger and the reheating heat exchanger, and combustion for supplying air to the burner When a circulation pump drive command is issued immediately after the end of a single hot water supply operation in a single can two water bath hot water heater equipped with a fan, the combustion fan is driven and driven by the air blown by the combustion fan. A heat exchanger for cooling the hot water of the hot water; At least one of the temperature detection means provided The hot water temperature detected by To determine that there is no longer any risk of hot water jetting from the reheating heat exchanger into the bathtub Until the temperature drops below a predetermined threshold temperature. In circulation A pump drive prohibition control unit that prohibits driving of the ring pump is provided as means for solving the above problems.
[0016]
The second invention is A hot water heat exchanger that heats the supplied water to supply hot water, and a reheating heat exchanger that reheats the bathtub hot water supplied through the recirculation circulation path by driving the circulation pump to retreat the bathtub hot water And one or both of a recirculation circulation path temperature detection means for detecting the hot water temperature of the reheating circulation passage and a hot water supply heat exchanger temperature detection means for detecting the hot water temperature of the hot water supply heat exchanger. Temperature detection means is provided, the hot water heat exchanger and the reheating heat exchanger are integrated, a burner for commonly burning and heating the hot water heat exchanger and the reheating heat exchanger, and air to the burner When a circulation pump drive command is issued immediately after the hot water supply single operation is finished in a single can two-way bath water heater provided with a combustion fan to be supplied, the combustion fan is driven to blow air by driving the combustion fan. A heat exchanger hot water temperature cooling control unit for cooling the hot water in the reheating heat exchanger I, at least one of the temperature detecting means provided above Reheating heat exchanger temperature estimation detecting means for estimating and detecting hot water temperature in reheating heat exchanger based on When; When the circulation pump drive command is issued immediately after the hot water supply single operation is completed, the pump drive prohibition control unit is provided. ,Up The hot water temperature detected by the heat exchanger temperature estimation detecting means To determine that there is no longer any risk of hot water jetting from the reheating heat exchanger into the bathtub Means for solving the above problem is configured to prohibit driving of the circulation pump until the temperature falls below a predetermined threshold temperature.
[0017]
The third invention is A hot water heat exchanger that heats the supplied water to supply hot water, and a reheating heat exchanger that reheats the bathtub hot water supplied through the recirculation circulation path by driving the circulation pump to retreat the bathtub hot water And a reheating heat exchanger temperature detecting means for detecting the temperature in the reheating heat exchanger, and the hot water supply heat exchanger and reheating heat exchanger are integrated, and In a single-can two-water bath water heater equipped with a burner that combustes and heats the exchanger and the reheating heat exchanger in common, and a combustion fan that supplies air to the burner, the circulation pump is driven immediately after the hot water supply single operation is completed A heat exchanger hot water cooling control unit that drives the combustion fan when the command is issued and cools the hot water in the heat exchanger by blowing air by driving the combustion fan; The hot water temperature detected by the reheating heat exchanger temperature detecting means is To determine that there is no longer any risk of hot water jetting from the reheating heat exchanger into the bathtub Pump drive prohibition control unit that prohibits the circulation pump from being driven until the temperature falls below a predetermined threshold temperature. And; are provided The above-described configuration serves as a means for solving the problems.
[0018]
In addition to the configuration of the first, second, or third invention, the fourth invention is to avoid discharging hot water to the bathtub when the pump drive prohibition control unit prohibits the circulation pump from being driven. A means for notifying that the circulation pump is stopped is provided as a means for solving the above-mentioned problem.
[0019]
In the invention with the above configuration, for example, when a circulation pump drive command is issued immediately after the hot water supply single operation is finished, the heat exchanger hot water temperature cooling control unit drives the combustion fan to blow air to the reheating heat exchanger. send. The reheating heat exchanger and the hot water in the reheating heat exchanger are cooled by the air flow. Further, the pump drive prohibition control unit is configured such that the hot water temperature detected by the hot water heat exchanger temperature detecting means is a predetermined threshold temperature (that is, the hot water temperature in the reheating heat exchanger is not When the fear disappears, the circulation pump is prohibited from driving until the temperature drops below a temperature that can be estimated based on the detected hot water temperature of the hot water supply heat exchanger temperature detecting means.
[0020]
Since it is possible to ban the circulation pump until the hot water temperature in the heat exchanger has dropped to a temperature where there is no danger even if it is ejected into the bathtub, the hot water heated to a high temperature due to the hot water supply single operation The problem that hot water in the heat exchanger is ejected to the bathtub by driving the circulation pump is avoided. Moreover, since the cooling of the hot water in the reheating heat exchanger is promoted by the air blown by the combustion fan, the hot water in the reheating heat exchanger is often reduced to a safe hot water temperature even if it is jetted to the bathtub. The time required for the circulation pump is short.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments according to the present invention will be described below with reference to the drawings.
[0022]
The single can two-way bath water heater of the first embodiment has the system configuration shown in FIG. 2, and the characteristic feature is that in the reheating heat exchanger heated to a high temperature due to the single operation of the hot water supply. The hot water is provided with a control structure for preventing the hot water from being ejected to the bathtub by driving the circulation pump immediately after the hot water supply single operation is completed. In addition, since description of the system configuration | structure of the one can two water channel bath water heater of FIG. 2 was mentioned above, the duplication description is abbreviate | omitted.
[0023]
In this embodiment, as shown by the solid line in FIG. 1, the control device 35 includes a combustion control unit 40, a heat exchanger hot water temperature cooling control unit 41, a hot water supply single operation monitoring unit 42, and a pump drive prohibition control unit 43. It is configured.
[0024]
The combustion control unit 40 is preliminarily given with a sequence program for performing appliance operations such as hot water supply, hot water filling, chasing, and heat retention, and the combustion control unit 40 provides information on the output of various sensors such as the water amount sensor 28. And the information of the remote controller 36 such as the hot water supply set temperature is fetched every moment, and the appliance operation is controlled as described above according to the sequence program based on the fetched information.
[0025]
The hot water supply single operation monitoring unit 42 takes in the operation information of the combustion control unit 40 and monitors whether or not the hot water supply single operation is performed. That is, when the combustion flame of the burner 3 is detected by a flame rod electrode (not shown) or the like with the circulation pump 18 stopped and the pouring control valve 24 closed (or by the water amount sensor 28). When the water flow is detected), it is determined that the hot water supply single operation is being performed, and otherwise, it is determined that the hot water supply single operation is not being performed.
[0026]
The heat exchanger hot water temperature cooling control unit 41 captures the operation information of the combustion control unit 40 and the monitoring information of the hot water supply single operation monitoring unit 42 momentarily, and immediately after the hot water supply single operation is completed based on the acquired information. When it is detected that a drive command for the circulation pump 18 has been issued due to a heat retaining operation, a reheating operation, or the like, the combustion fan 25 is made to burn at a predetermined rotation speed (for example, when the burner 3 is burned at a predetermined maximum combustion heat amount). It is driven to rotate at the fan rotation speed (or fan air volume).
[0027]
By the driving of the combustion fan 25, the air at substantially the supply air temperature is blown to the hot water supply heat exchanger 10 and the reheating heat exchanger 14, and the hot water supply heat exchanger 10 and the reheating heat exchanger 14 heated by the hot water combustion are used. The amount of heat is taken away by the fan blow, and cooling of the hot water in the reheating heat exchanger 14 is promoted. Normally, after the combustion of the burner 3 is stopped, the combustion fan 25 is continuously driven for a predetermined time (for example, 5 minutes) to perform post-purge to exhaust the exhaust gas in the combustion chamber 2. The amount of air blown during the post purge is very small, and therefore, the effect of promoting cooling of the hot water in the reheating heat exchanger 14 is hardly obtained by the air blowing during the post purge.
[0028]
In this embodiment, when a drive command for the circulation pump 18 is issued immediately after the hot water supply single operation is completed, the hot water in the reheating heat exchanger 14 is effectively cooled by the air blown by the combustion fan 25. The fan rotation speed (or fan air volume) that can be used is determined in advance, and as described above, the heat exchanger hot water temperature cooling control unit 41 issues a drive command for the circulation pump 18 immediately after the hot water supply single operation is completed. In some cases, the combustion fan 25 is driven at the predetermined rotation speed (fan air volume) to effectively cool the hot water in the reheating heat exchanger 14.
[0029]
When the drive command for the circulation pump 18 is issued immediately after the hot water supply single operation is finished, the pump drive prohibition control unit 43 causes the hot water in the reheating heat exchanger 14 heated to a high temperature by the hot water supply single operation to be stored in the bathtub 17. The circulation pump 18 is prohibited from being driven until the temperature drops to a temperature at which there is no risk of causing burns or the like to the bather even if it is ejected.
[0030]
By the way, the hot water temperature in the reheating heat exchanger 14 can be estimated based on the hot water temperature Tho detected by the reheating heat exchange thermistor 34. Further, since the hot water supply heat exchanger 10 and the reheating heat exchanger 14 are integrated, heat is exchanged between the hot water supply heat exchanger 10 and the reheating heat exchanger 14, so the hot water supply heat exchanger 10 side The hot water temperature in the reheating heat exchanger 14 can be estimated and detected based on the hot water temperature (that is, the hot water temperature Tko detected by the hot water supply heat exchange thermistor 31).
[0031]
Therefore, in this embodiment, the pump drive prohibition control unit 43 is based on the hot water temperature Tko detected by the hot water supply heat exchange thermistor 31 and the hot water temperature Tho detected by the reheating heat exchange thermistor 34. When a drive command for the circulation pump 18 is issued after the hot water supply individual operation is completed, it is determined whether or not the hot water in the reheating heat exchanger 14 is at a dangerous temperature for hot water ejection, and in the reheating heat exchanger 14. The circulation pump 18 is prohibited from being driven until the hot water drops to a temperature at which there is no risk of high-temperature hot water jetting.
[0032]
Specifically, the threshold temperature Tks for the hot water temperature Tko detected by the hot water supply heat exchange thermistor 31 and the threshold temperature Ths for the hot water temperature Tho detected by the reheating heat exchange thermistor 34 are as follows. Are obtained in advance and given to the pump drive prohibition control unit 43. The hot water temperature Tsp (for example, 60 ° C.) in the reheating heat exchanger 14 for determining whether or not there is a risk of high temperature hot water jetting into the bathtub 17 can be determined in advance, and circulation after the hot water supply individual operation ends. While the pump 18 is stopped (that is, with hot water remaining in the recirculation circulation passage 21), when the hot water in the reheating heat exchanger 14 is at the hot water temperature Tsp, the reheating heat exchange thermistor 34 The detected temperature Ths is obtained in advance by experiments, calculations, and the like, and the obtained temperature Ths is replenished and given to the pump drive inhibition control unit 43 as a threshold temperature for the detected hot water temperature Th of the heat exchanger thermistor 34.
[0033]
Further, the hot water supply heat exchange thermistor 31 detects when the hot water in the reheating heat exchanger 14 is at the hot water temperature Tsp in the state where hot water is staying in the hot water supply heat exchanger 10 after the hot water supply single operation is completed. The hot water temperature Tks is obtained in advance by experiments, calculations, etc., and the obtained hot water temperature Tks is given to the pump drive inhibition control unit 43 as a threshold temperature for the detected hot water temperature Tko of the hot water supply heat exchange thermistor 31.
[0034]
Of course, when the threshold temperatures Tks and Ths are obtained, the size of the can of the hot water supply heat exchanger 10 and the reheating heat exchanger 14 and the position of the hot water supply heat exchanger 10 and the hot water heat exchange thermistor 31 are arranged. And the interval between the reheating heat exchanger 14 and the position where the pump drive prohibition control unit 43 is disposed, and the like.
[0035]
The pump drive prohibition control unit 43 detects the operation information of the combustion control unit 40, the monitoring information of the hot water supply individual operation monitoring unit 42, the hot water temperature information detected by the hot water supply heat exchange thermistor 31, and the reheating heat exchange thermistor 34. The detected hot water temperature information is taken in every moment, and each time the hot water temperature is detected, the detected hot water temperature Tko of the hot water supply heat exchange thermistor 31 is compared with the corresponding threshold temperature Tks. Th is compared with the corresponding threshold temperature Ths, and it is detected based on the information of the combustion control unit 40 and the hot water supply single operation monitoring unit 42 that a drive command for the circulation pump 18 is issued immediately after the hot water supply single operation is completed. Sometimes the detected hot water temperature Tko of the hot water heat exchange thermistor 31 is equal to or higher than the threshold temperature Tks, or the detected hot water temperature Tho of the reheating heat exchanger thermistor 34 is equal to or higher than the threshold temperature Ths. When the hot water in the reheating heat exchanger 14 is ejected to the bathtub 17, it is determined that the hot water temperature may cause a hazard such as burns to the bather. Judging that there is a risk of high-temperature hot water jetting, a pump drive prohibition signal for prohibiting the start of driving of the circulation pump 18 is output to the combustion control unit 40, and the drive start operation of the circulation pump 18 by the combustion control unit 40 is postponed. Let
[0036]
The pump drive prohibition control unit 43 continuously takes in the detected hot water temperature Tko of the hot water supply heat exchange thermistor 31 and the detected hot water temperature Tho of the reheating heat exchange thermistor 34 from time to time, and detects the detected hot water temperature Tko of the hot water supply heat exchange thermistor 31. The pump drive prohibition signal is continuously output until both of the detected hot water temperatures Tho of the reheating heat exchange thermistor 34 are lower than the corresponding threshold temperatures Tks and Ths, and the drive prohibition state of the circulation pump 18 is changed. Let it continue. In other words, when both the detected hot water temperature Tko of the hot water supply heat exchange thermistor 31 and the detected hot water temperature Tho of the reheating heat exchange thermistor 34 are lower than the corresponding threshold temperatures Tks and Ths, reheating heat exchange is performed. It can be determined that the hot water temperature in the vessel 14 has been lowered to a safe hot water temperature without risk of jetting of hot water into the bathtub, and the combustion control unit 40 receives a continuous pump drive prohibition signal from the pump drive prohibition control unit 43. Is stopped, the circulation pump 18 starts to be driven.
[0037]
When the pump drive prohibition control unit 43 stops outputting the pump drive prohibition signal, the pump drive prohibition control unit 43 outputs an air cooling stop signal to the heat exchanger hot water temperature cooling control unit 41, and the heat exchanger hot water temperature cooling control unit 41 performs combustion. The rotation control of the fan 25 is terminated.
[0038]
According to this embodiment, when a drive command for the circulation pump 18 is issued immediately after the hot water supply single operation is completed, the detected hot water temperature Tko of the hot water heat exchange thermistor 31 and the detected hot water temperature Tho of the reheating heat exchange thermistor 34 are displayed. On the basis of the above, the pump drive prohibition control unit 43 prohibits the circulation pump 18 from being driven until it is determined that the hot water in the reheating heat exchanger 14 has decreased to a hot water temperature at which there is no danger of hot water jetting into the bathtub 17. Therefore, the problem of high temperature hot water spraying due to the driving of the circulation pump 18 immediately after the end of the hot water supply single operation, that is, the hot water in the reheating heat exchanger 14 heated to a high temperature due to the single hot water supply operation is the single hot water supply. It is possible to surely avoid the problem that the circulation pump 18 immediately after the operation is blown out to the bathtub 17 to cause danger such as burns to the bather.
[0039]
Further, as described above, the drive prohibition control of the circulation pump 18 by the pump drive prohibition control unit 43 is performed based on the hot water temperature detected by the hot water supply heat exchange thermistor 31 and the reheating heat exchange thermistor 34. Even though the hot water in the exchanger 14 is at a high temperature, the drive prohibition control of the circulation pump 18 is finished and the drive of the circulation pump 18 is started, causing the problem of the high temperature hot water ejection, or in the reheating heat exchanger 14. In spite of the fact that the hot water has dropped to a sufficiently safe hot water temperature, the drive prohibition control of the circulation pump 18 is continued, and the circulation pump 18 is driven at an appropriate timing to avoid the problem that there is a useless prohibition time. It is possible to end the prohibition control and start driving the circulation pump 18.
[0040]
In addition, a heat exchanger hot water cooling control unit 41 is provided, and when the drive command for the circulation pump 18 is issued immediately after the hot water supply independent operation is finished, the heat exchanger hot water cooling control unit 41 drives the combustion fan 25. Since the cooling of the hot water in the reheating heat exchanger 14 is promoted by the fan blowing, the time until the hot water in the reheating heat exchanger 14 is lowered to a hot water temperature at which there is no risk of the hot water being blown into the bathtub 17 is reduced. It can be shortened. Therefore, the drive prohibition time of the circulation pump 18 by the pump drive prohibition control unit 43 can be shortened.
[0041]
The second embodiment will be described below. In this embodiment, the reheating heat exchanger temperature estimation detecting means 44 shown by the chain line in FIG. 1 is provided, and the reheating heat exchanger temperature estimation detecting means 44 calculates the hot water temperature in the reheating heat exchanger 14. Based on the hot water temperature of the reheating heat exchanger 14 estimated and detected by the reheating heat exchanger temperature estimation detecting means 44, the drive inhibition control of the circulation pump 18 is performed by the pump drive inhibition control unit 43. The rest of the configuration is the same as that of the first embodiment, and redundant description of common parts is omitted.
[0042]
The reheating heat exchanger temperature estimation detecting means 44 includes reheating heat based on one or both of the hot water temperature Tko detected by the hot water supply heat exchange thermistor 31 and the hot water temperature Tho detected by the reheating heat exchange thermistor 34. Hot water temperature estimation detection data for presuming and detecting the hot water temperature in the exchanger 14 is given in advance in the form of graph data, arithmetic expression data, and table data, and the reheating heat exchanger temperature estimation detecting means 44 is The detected hot water temperature Tko of the hot water heat exchange thermistor 31 or the detected hot water temperature Tho of the reheating heat exchange thermistor 34 is taken momentarily, and the reheating heat exchanger is based on the taken hot water temperature and the hot water temperature estimation detection data. 14, the hot water temperature in the reheating heat exchanger 14 is estimated and detected. Every time the hot water temperature in the reheating heat exchanger 14 is estimated and detected, the information on the estimated hot water temperature Thf in the reheating heat exchanger 14 is controlled to prohibit the pump drive. To the unit 43.
[0043]
The pump drive prohibition control unit 43 has a threshold value for determining whether or not the hot water in the reheating heat exchanger 14 is at a temperature at which the bather may be injured such as a burn when the hot water is ejected to the bathtub 17. Whenever the temperature Tsp is given in advance, the pump drive prohibition control unit 43 receives the estimated hot water temperature Thf in the reheating heat exchanger 14 from the reheating heat exchanger temperature estimation detecting means 44 every time. The estimated hot water temperature Thf is compared with the threshold temperature Tsp, and when the estimated detected hot water temperature Thf is equal to or higher than the threshold temperature Tsp, it is determined that there is a risk of high temperature hot water spraying. When a drive command for the circulation pump 18 is issued immediately after the hot water supply single operation is finished in a state where it is determined that there is a possibility of the hot water supply, as in the first embodiment, a pump drive prohibition signal is sent to the combustion control unit. Output to 40 circulation pump 1 To postpone the start of driving.
[0044]
Then, the pump drive prohibition control unit 43 continues the operation of comparing the estimated detection temperature Thf of the reheating heat exchanger 14 detected by the reheating heat exchanger temperature estimation detecting means 44 with the threshold temperature Tsp, The pump drive inhibition signal is continuously output until it is determined that the estimated detection temperature Thf is lower than the threshold temperature Tsp and there is no risk of the hot water jetting out. As in the first embodiment, the combustion control unit 40 postpones the driving of the circulation pump 18 until the pump drive prohibition control unit 43 determines that there is no risk of high temperature hot water jetting, that is, the high temperature When it is determined that there is no risk of hot water jetting, the driving of the circulation pump 18 is started.
[0045]
According to the second embodiment, the reheating heat exchanger temperature estimation detecting means 44 for estimating and detecting the hot water temperature in the reheating heat exchanger 14 is provided, and the circulation pump 18 is driven immediately after the hot water supply single operation is completed. When the command is issued, the estimated hot water temperature Thf in the reheating heat exchanger 14 detected by the reheating heat exchanger temperature estimation detecting means 44 is more than the threshold temperature Tsp at which it can be determined that there is no possibility of high temperature hot water jetting. Since the driving of the circulation pump 18 is prohibited until the temperature decreases, the problem of high-temperature hot water ejection to the bathtub 17 can be reliably avoided as in the first embodiment. Of course, also in this embodiment, as in the first embodiment, when the drive command for the circulation pump 18 is issued immediately after the hot water supply single operation is completed, the heat exchanger hot water temperature cooling control unit 41 performs the operation. Since the combustion fan 25 is rotationally driven, the cooling of the hot water in the reheating heat exchanger 14 is promoted, and the effect of shortening the drive inhibition time of the circulation pump 18 can be achieved.
[0046]
The third embodiment will be described below. A characteristic feature of this embodiment is that, as shown by a broken line in FIG. 2, reheating heat exchange as reheating heat exchanger temperature detecting means for directly detecting the hot water temperature in the reheating heat exchanger 14. A temperature sensor 38 is provided, and the pump drive inhibition control unit 43 performs a drive inhibition control of the circulation pump 18 based on the hot water temperature detected by the reheating heat exchange temperature sensor 38. Yes. Other configurations are the same as those in each of the above-described embodiments, and a duplicate description of common portions is omitted.
[0047]
The threshold value Tsp is given in advance to the pump drive prohibition control unit 43, and the pump drive prohibition control unit 43 detects hot water in the reheating heat exchanger 14 detected by the reheating heat exchanger temperature sensor 38. Every time the temperature is taken in, and the hot water temperature detected by the reheating heat exchange temperature sensor 38 is taken in, the hot water temperature detected by the reheating heat exchange temperature sensor 38 is compared with the threshold temperature Tsp, and the reheating heat exchange is performed. When the temperature of the hot water detected by the temperature sensor 38 is equal to or higher than the threshold temperature Tsp, it is determined that there is a risk of high-temperature hot water jetting into the bathtub 17, and as described above, it is determined that there is a risk of high-temperature hot water jetting. Thus, when a drive command for the circulation pump 18 is issued immediately after the hot water supply single operation is completed, a pump drive prohibition signal is output to the combustion control unit 40, and the start of driving of the circulation pump 18 by the combustion control unit 40 is postponed.
[0048]
Then, the pump drive prohibition control unit 43 continuously takes in the detected hot water temperature of the reheating heat exchange temperature sensor 38, compares the detected hot water temperature of the reheating heat exchange temperature sensor 38 with the threshold temperature Tsp, and reheats the heat. The pump drive prohibition signal is continuously output until the hot water temperature detected by the AC temperature sensor 38 falls below the threshold temperature Tsp, and the drive standby state of the circulation pump 18 is continued. That is, when the hot water temperature detected by the reheating heat exchanger temperature sensor 38 is lower than the threshold temperature Tsp, it is determined that there is no possibility of hot water jetting into the bathtub 17 and the circulation pump 18 is started to be driven.
[0049]
According to the third embodiment, the reheating heat exchange temperature sensor 38 that directly detects the hot water temperature in the reheating heat exchanger 14 is provided, and the circulation pump 18 is driven immediately after the hot water supply single operation is completed. When the command is issued, the drive prohibition control of the circulation pump 18 is performed based on the hot water temperature detected by the reheating heat exchanger temperature sensor 38, so that the hot water temperature in the reheating heat exchanger 14 is estimated and detected. Compared to the above, the hot water temperature in the reheating heat exchanger 14 can be detected more accurately, and when the drive command for the circulation pump 18 is issued immediately after the hot water supply single operation is completed, the problem of high temperature hot water ejection can be avoided. Of course, the driving of the circulation pump 18 can be started at a more appropriate timing.
[0050]
The present invention is not limited to the above embodiments, and various embodiments can be adopted. For example, in the first or second embodiment, the pump drive prohibition control is based on both the hot water temperature Tko detected by the hot water supply heat exchange thermistor 31 and the hot water temperature Tho detected by the reheating heat exchange thermistor 34. Although the drive prohibition control of the circulation pump 18 is performed by the unit 43, the pump drive prohibition control unit 43 includes the detected hot water temperature Tko of the hot water supply heat exchange thermistor 31 and the detected hot water temperature Tho of the reheating heat exchange thermistor 34. The prohibition control of the circulation pump 18 may be performed based on only one of the detected hot water temperatures.
[0051]
In the first or second embodiment, the hot water supply heat exchange thermistor 31 is used as the hot water supply heat exchanger temperature detection means, and the pump temperature is prohibited by using the hot water temperature Tko detected by the hot water supply heat exchange thermistor 31. Although the control unit 43 performs the drive prohibition control of the circulation pump 18, as shown by the dotted line in FIG. 2, the hot water supply heat exchanger temperature sensor 37 for detecting the hot water temperature in the hot water supply heat exchanger 10 is provided. The hot water supply heat exchange temperature sensor 37 functions as a hot water supply heat exchanger temperature detection means, and the pump drive prohibition control unit 43 is detected by the hot water supply heat exchange temperature sensor 37. You may make it perform drive prohibition control of the circulation pump 18 using hot water temperature.
[0052]
Furthermore, in each of the above embodiments, when the combustion fan 25 is driven by the heat exchanger hot water cooling control unit 41, the rotational speed (fan air volume) higher than the rotational speed (fan air volume) of the combustion fan 25 by post purge. However, the combustion fan 25 may be driven to rotate at a fan rotational speed (fan air volume) substantially equal to the fan rotational speed (fan air volume) during post-purge. In this case, although the effect of the cooling action of the reheating heat exchanger 14 by fan blowing is inferior to that of each of the above embodiments, the temperature at which the hot water in the reheating heat exchanger 14 is not likely to blow out hot water. Since the pump drive prohibition control unit 43 prohibits the circulation pump 18 from being driven until the temperature drops, the problem of high-temperature hot water ejection caused by the drive of the circulation pump 18 immediately after the end of the hot water supply individual operation can be reliably avoided. it can.
[0053]
Further, in addition to the control configuration shown in each of the above embodiments, when the pump drive prohibition control unit 43 prohibits the circulation pump 18 from being driven, the circulation pump 18 is controlled to avoid discharging hot water to the bathtub 17. The following notification means for notifying that the driving is stopped may be provided in the remote controller 36 or the like. For example, the notification means displays a lamp that lights when the circulation pump 18 is stopped by the pump drive prohibition control unit 43, or a symbol or character that indicates that the circulation pump 18 is stopped by the pump drive prohibition control unit 43. It is formed by a display unit for displaying.
[0054]
Furthermore, although each said embodiment demonstrated and demonstrated the canned two water channel bath water heater shown in FIG. 2 as an example, this invention can be applied if it is a canned two water channel type bath water heater. For example, in the canned two-channel bath water heater shown in FIG. 2, the reheating heat thermistor 34 is provided on the outlet side of the reheating heat exchanger 14, but this invention is provided with the reheating heat exchange thermistor 34. In this case, the bath temperature sensor 33 may function as a recirculation circulation passage temperature detecting means, or the reheating side hot water temperature is used. Instead, the pump drive prohibition control by the pump drive prohibition control unit 43 may be performed using only the temperature detected by the temperature sensor on the hot water supply side. In the example shown in FIG. 2, the circulation pump 18 is provided on the downstream side of the outlet side of the reheating heat exchanger 14, but the circulation pump 18 is connected to the return pipe 15 on the inlet side of the reheating heat exchanger 14. 18 may be provided.
[0055]
【The invention's effect】
According to the present invention, when the circulation pump drive command is issued immediately after the hot water supply single operation is finished, the hot water temperature detected by the recirculation circulation passage temperature detection means or the hot water supply heat exchanger temperature detection means is detected. In the reheating heat exchanger based on the hot water temperature estimated or detected in the reheating heat exchanger or the hot water temperature directly detected by the reheating heat exchanger temperature detecting means. The pump drive prohibition control unit prohibits the circulation pump from being driven until it is determined that the hot water has dropped to a temperature at which there is no risk of high-temperature hot water jetting into the bathtub. The heated hot water in the reheating heat exchanger does not spout into the bathtub immediately after the end of the hot water supply operation, and the hot water in the reheating heat exchanger is not discharged immediately after the end of the hot water supply operation. Erupt into the bathtub It is possible to reliably avoid the problem that the harm of burns, etc. Upon the bath's.
[0056]
Further, the hot water temperature in the reheating heat exchanger is detected directly or indirectly, and based on the detected hot water temperature, the pump drive prohibition control unit performs the prohibition control of the circulation pump. When the hot water in the reheating heat exchanger has cooled to a temperature at which it can be determined that there is no longer a risk of high temperature hot water jetting, that is, the hot water in the reheating heat exchanger has not been cooled. The prohibition control ends and the circulation pump is driven, and hot water in the reheating heat exchanger is jetted out to the bathtub, or the hot water in the reheating heat exchanger is sufficiently cooled. The drive prohibition control is continuously performed, and the drive prohibition control of the circulation pump is finished at an appropriate timing that can avoid the problem that the useless pump drive prohibition time is generated, so that the circulation pump can be driven.
[0057]
In addition, according to the present invention, a heat exchanger hot water temperature cooling control unit is provided, and when a circulation pump drive command is issued immediately after the hot water supply independent operation is finished, the combustion fan is driven by the heat exchanger hot water temperature cooling control unit. Therefore, this fan ventilation can promote the cooling of the hot water in the reheating heat exchanger, and there is no possibility that the hot water in the reheating heat exchanger will spout out of the hot water after the hot water supply independent operation is completed. The time until the temperature is lowered is shortened, and the circulation pump drive inhibition time by the pump drive inhibition control unit can be shortened.
[0058]
When the pump drive prohibition control unit is prohibited from driving the circulation pump, it is provided with a notification means for notifying that the circulation pump is stopped in order to avoid discharging hot water to the bathtub. In this case, for example, if the user of the single can two water channel bath water heater has instructed the start of the recirculation, the circulation pump drive is started and the renewal is not started. There is a possibility that it may be abnormal, but the reason why the circulation pump is stopped by the pump drive prohibition control unit by providing the notification means as described above is to avoid discharging hot water to the bathtub and is not abnormal It can be notified by the notification means, and it is possible to avoid giving unnecessary concern to the user.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment according to the present invention.
FIG. 2 is an explanatory view showing a model example of a single can / two water bath hot water heater.
[Explanation of symbols]
3 Burner
10 Hot water supply heat exchanger
14 Reheating heat exchanger
17 Bathtub
18 Circulation pump
21 Recirculation circulation passage
25 Combustion fan
31 Hot water supply heat exchange thermistor
34 Reheating Thermal Exchange Thermistor
37 Hot water heat exchanger temperature sensor
38 Reheating Heat Exchange Temperature Sensor
41 Heat exchanger hot water cooling control unit
43 Pump drive prohibition controller
44 Reheating heat exchanger temperature estimation detecting means

Claims

A hot water heat exchanger that heats the supplied water to supply hot water, and a reheating heat exchanger that reheats the bathtub hot water supplied through the recirculation circulation path by driving the circulation pump to retreat the bathtub hot water is provided, also, one or both of the hot water supply heat exchanger temperature detection means for detecting a hot water temperature of the reheating circulation passage temperature detecting means and the hot water supply heat exchanger for detecting the hot water temperature of the reheating circulation path Temperature detection means is provided, the hot water heat exchanger and the reheating heat exchanger are integrated, a burner for commonly burning and heating the hot water heat exchanger and the reheating heat exchanger, and air to the burner When a circulation pump drive command is issued immediately after the hot water supply single operation is finished in a single can two-way bath water heater provided with a combustion fan to be supplied, the combustion fan is driven to blow air by driving the combustion fan. A heat exchanger hot water temperature cooling control unit for cooling the hot water in the reheating heat exchanger I; bathtub from at least one hot water detected temperature by the reheating heat exchanger temperature detecting means provided above characterized in that are provided; and the pump drive prohibition control unit for prohibiting the driving of the circulation pump at reduced until than a predetermined threshold temperature for determining that no longer a risk of hot water jetting to One can two water bath hot water heater.

A hot water heat exchanger that heats the supplied water to supply hot water, and a reheating heat exchanger that reheats the bathtub hot water supplied through the recirculation circulation path by driving the circulation pump to retreat the bathtub hot water And one or both of a recirculation circulation path temperature detection means for detecting the hot water temperature of the reheating circulation passage and a hot water supply heat exchanger temperature detection means for detecting the hot water temperature of the hot water supply heat exchanger. Temperature detection means is provided, the hot water heat exchanger and the reheating heat exchanger are integrated, a burner for commonly burning and heating the hot water heat exchanger and the reheating heat exchanger, and air to the burner When a circulation pump drive command is issued immediately after the hot water supply single operation is finished in a single can two-way bath water heater provided with a combustion fan to be supplied, the combustion fan is driven to blow air by driving the combustion fan. A heat exchanger hot water temperature cooling control unit for cooling the hot water in the reheating heat exchanger I; estimates detecting water temperature of at least the one on the basis of Reheating heat exchanger temperature detecting means provided above and reheating heat exchanger temperature estimated detection means; is provided, the pump drive prohibition control unit, when the circulation pump drive command immediately after the single hot water supply run is completed is issued, the upper Symbol Reheating heat exchanger temperature The circulating pump is prohibited from being driven until the hot water temperature detected by the estimation detecting means falls below a predetermined threshold temperature for determining that there is no longer any risk of hot water from the reheating heat exchanger to the bathtub. One can two water bath water heater characterized by that .

A hot water heat exchanger that heats the supplied water to supply hot water, and a reheating heat exchanger that reheats the bathtub hot water supplied through the recirculation circulation path by driving the circulation pump to retreat the bathtub hot water And a reheating heat exchanger temperature detecting means for detecting the temperature in the reheating heat exchanger, and the hot water supply heat exchanger and reheating heat exchanger are integrated, and In a single-can two-water bath water heater equipped with a burner that combustes and heats the exchanger and the reheating heat exchanger in common, and a combustion fan that supplies air to the burner, the circulation pump is driven immediately after the hot water supply single operation is completed When a command is issued, a heat exchanger for cooling the hot water in the reheating heat exchanger by driving the combustion fan and cooling the hot water in the reheating heat exchanger by blowing air by driving the combustion fan; and the reheating heat exchanger temperature detecting means Yo Pump drive prohibiting for prohibiting the driving of the circulation pump from the detected water temperature is Reheating heat exchanger until drops below a predetermined threshold temperature for determining that no longer a risk of hot water jetting to the bathtub One can two water channel bath water heater characterized by having a control part ;

An informing means is provided for notifying that the circulation pump is stopped in order to avoid discharging hot water to the bathtub when the pump drive inhibition control unit is prohibited from driving the circulation pump. A single can two-way bath water heater according to claim 1, claim 2 or claim 3.