JP3754474B2

JP3754474B2 - Combined water heater

Info

Publication number: JP3754474B2
Application number: JP27648895A
Authority: JP
Inventors: 寿久斉藤; 久恭渡辺; 晃太郎木村; 喜久雄岡本; 清福澤
Original assignee: 株式会社ガスター
Priority date: 1995-09-29
Filing date: 1995-09-29
Publication date: 2006-03-15
Anticipated expiration: 2015-09-29
Also published as: JPH0996445A

Description

【０００１】
【発明の属する技術分野】
本発明は、給湯バーナと給湯以外の他機能バーナとを備えた複合給湯器に関するものである。
【０００２】
【従来の技術】
図６には従来の一般的な複合給湯器のシステム構成が示されている。同図において、器具１内には仕切り部２を介して、給湯燃焼室３と、他機能燃焼室としての風呂燃焼室４とに区画されており、給湯燃焼室３には給湯バーナとしての給湯バーナ装置５が設けられ、風呂燃焼室４には風呂バーナとしての風呂バーナ装置６が設けられている。
【０００３】
前記給湯バーナ装置５と風呂バーナ装置６は仕切り部２を介して並設されており、各バーナ装置５，６のガス導入口側には、ガスノズルを対向させてガスノズルホルダ12，13がそれぞれ配置され、ガスノズルホルダ12，13に通じるガス供給通路36には、元電磁弁37とガス比例弁38が設けられており、ガス比例弁38の下流側のガス供給通路36を分岐させて給湯能力制御弁39と、風呂能力制御弁40にガスが導かれている。給湯バーナ装置５と風呂バーナ装置６の下方側は共通の空気チャンバ（空気室）７となっており、この空気チャンバ７の底面側には給排気用の燃焼ファン８が連設されている。
【０００４】
前記給湯燃焼室３には、給湯バーナ装置５の上方側に給湯熱交換器15が設置されており、この給湯熱交換器15は、水道等の水供給源から給水通路19を介して導入される水を、給湯バーナ装置５の燃焼火炎によって加熱して設定温度の湯を作り出し、この湯を、給湯熱交換器15の出側に接続される給湯通路20を介して台所や浴室等の所望の給湯場所に導き出湯を行う。なお、給水通路19には流量センサ41が介設されており、水供給源から給湯器に供給される水の流量が検出されるようになっている。また、図中、30は入水温度センサ、31は出湯温度センサを示しており、これらのセンサによって給湯熱交換器15への入水温度と給湯熱交換器15からの出湯温度とがそれぞれ検出される。
【０００５】
前記風呂燃焼室４には前記風呂バーナ装置６の上方側に追い焚き熱交換器16が設置されており、この追い焚き熱交換器16の入口側には管路22の一端側が接続され、管路22の他端側は循環ポンプ23の吐出側に接続されている。この管路22には通水の温度を検出するサーミスタ等の風呂温度センサ24が設けられている。
【０００６】
循環ポンプ23の吸込側には追い焚き循環路25の戻り管26が接続されており、循環口である戻り管26の戻り口側（入口側）は浴槽21の側壁に循環金具27を介して接続されている。この戻り管26には通水を検知してオン信号を出力する流水検出センサとしての追い焚き流水スイッチ28が設けられている。追い焚き熱交換器16の出口側には追い焚き循環路25の往管29の入口側が接続されており、往管29の出口側は循環金具27を介して浴槽21の側壁に接続されている。追い焚き熱交換器16は、浴槽からの循環湯水を導入して風呂バーナ装置６の燃焼火炎によって加熱し、この加熱した湯を浴槽21に戻すことで、風呂の追い焚きを行う。風呂燃焼室４および前記給湯燃焼室３は、共に、共通の排気口42に連通しており、給湯バーナ装置５の排気ガスと風呂バーナ装置６の排気ガスとが共通の排気口42から排出されるようになっている。
【０００７】
前記給湯通路20には湯張り用管32が分岐されて管路22と接続されており、この湯張り用管32には、注湯制御弁としての注湯弁35と、浴槽水位を検出する水位検出センサとしての圧力センサ34とが設けられている。
【０００８】
この種の複合給湯器には、給湯バーナ燃焼および風呂バーナ燃焼等の制御を行う制御装置５６が設けられており、制御装置５６には、リモコン５５が接続されている。この制御装置５６には、前記流量センサ４１等の様々なセンサからの信号が加えられるようになっており、例えば、給湯通路２０が導かれている台所等の給湯場所に設けられた給湯栓（図示せず）が開かれ、水道等の水供給源から給水通路１９に水が導入されると、制御装置５６は流量センサ４１から入水信号を受けたときに燃焼ファン８を回転し、ガス供給通路３６の元電磁弁３７とガス比例弁３８と給湯能力制御弁３９を開き、その状態で給湯バーナ装置５の点着火を行い、炎を検知した以降に、出湯温度センサ３１で検出される出湯温度がリモコン５５で設定される設定温度となるように給湯モードでの給湯運転を制御する。
【０００９】
この給湯運転の制御に際し、前記制御装置56には、予め、給湯燃焼の最小燃焼時の燃焼熱量（最小燃焼熱量）と最大燃焼時の燃焼熱量（最大燃焼熱量）とが与えられており、制御装置56は、前記最小燃焼熱量から最大燃焼熱量までの範囲内で給湯バーナ燃焼が行われるように、ガス供給通路36から給湯バーナ装置５への供給ガス量と、燃焼ファン８から給湯バーナ装置５への供給空気量を制御し、これらの制御により、安定した設定温度の湯が給湯熱交換器15から給湯通路20を経て所望の給湯場所に供給されるようにしている。
【００１０】
前記制御装置56は、電磁弁等の注湯弁35を開けることにより、給湯熱交換器15側で作り出した湯を追い焚き循環路25を介して浴槽21内に落とし込んで湯張りを行う湯張りモードの運転動作機能を備えている。この自動湯張り動作はリモコン55等の指令により行われ、圧力センサ34により湯張りの水位がリモコン55等で設定される設定水位に達したときに注湯弁35が閉じられて湯張りの停止が行われ、次に循環ポンプ23を起動して追い焚きモードでの運転が行われるものである。
【００１１】
この追い焚き運転に際して、制御装置56は、まず、追い焚き循環路25の循環ポンプ23を回転させて、浴槽21内の湯水を追い焚き循環路25を介して循環させる。そして、追い焚き流水スイッチ28が湯水の流れを検知したときに、制御装置56は燃焼ファン８を回転し、電磁弁を開き、点着火により風呂バーナ装置６を燃焼させて追い焚き熱交換器16を通る循環湯水を加熱して浴槽21内の湯水の追い焚きを行う。
【００１２】
なお、この追い焚き運転制御に際し、通常、制御装置56には最大燃焼熱量の値が与えられており、この最大燃焼熱量に対応させたファン回転数で燃焼ファン８の回転を行い、風呂バーナ装置６のバーナ燃焼を行って、できるだけ早く追い焚きが行われるようにする。そして、風呂温度センサ24で検出される風呂温度がリモコン55によって設定される風呂設定温度に達したときに追い焚き運転を停止する。
【００１３】
この種の複合給湯器においては、追い焚き運転の終了時から所定の時間（例えば４時間）にかけて保温モードに移り、この保温モードでは、例えば30分等の時間間隔で循環ポンプ23を起動して浴槽湯水を追い焚き循環路25を通して循環し、このとき風呂温度センサ24で検出される浴槽湯水の温度が風呂設定温度に対し、所定の温度を越えて低下したときには、風呂バーナ装置６を燃焼して浴槽湯水の温度を設定温度に高める等の動作を行って浴槽湯水の保温を行う。この保温動作において、水位保持機能を備えた風呂装置のものにあっては、保温モードの期間中、常に、圧力センサ34の水位検出信号によって浴槽水位を監視し、浴槽水位が設定水位から許容範囲を越えて低下したときには、注湯弁35を開けて設定水位までの不足分の水量を給湯熱交換器15側から足し湯し、浴槽水位を設定水位に保持する保水モードでの動作を行う。
【００１４】
なお、従来の複合給湯器には、図７に示すように、給湯バーナ装置５の給湯バーナ燃焼の給排気を行う燃焼ファン８と風呂バーナ装置６の風呂バーナ燃焼の給排気を行う燃焼ファン９とを個別に設け、個別の燃焼室７ａ，７ｂを備えたものも用いられている。同図に示す複合給湯器においても、図６に示した複合給湯器と同様に、給湯燃焼室３および風呂燃焼室４は共通の排気口４２に連通しており、この種の複合給湯器においても、給湯バーナ装置５の排気ガスと風呂バーナ装置６の排気ガスとは共通の排気口４２から排出されるようになっている。
【００１５】
この種の複合給湯器においては、風呂バーナ装置６による風呂バーナ燃焼のみが行われる場合に、燃焼ファン９のみが回転されるのではなく、燃焼ファン９と８の両方の回転制御が行われる。それというのは、図７に示す複合給湯器のように、給湯バーナ装置５の排気ガスと風呂バーナ装置６の排気ガスとが共通の排気口42から排出されるタイプの複合給湯器においては、風呂バーナ装置６の燃焼時に給湯バーナ装置５側の燃焼ファン８の回転を行わないと、前記最大燃焼熱量に対応する最大燃焼能力で燃焼を行っている風呂バーナ装置６の排気ガスが給湯側に逆流し、その排気ガスが漏れると非常に危険であり、その危険を回避するためには、両方の燃焼ファン８，９を回転させる必要があるのである。なお、このときの燃焼ファン８の回転数は、燃焼ファン９の回転数に対応させて、大きな回転数で回転制御される。
【００１６】
【発明が解決しようとする課題】
ところで、図８の特性線ａには、上記複合給湯器等の燃焼装置において、前回の給湯燃焼終了後に給湯熱交換器15内に残留している湯の残留湯温変化が示されているが、この図から明らかなように、給湯燃焼停止後に給湯熱交換器15の本体およびフィン47に保有していた熱等が給湯熱交換器15に残留している湯に徐々に伝播して、残留湯温は設定温度よりも徐々に上昇していき（この現象を後沸きという）、その後、時間の経過とともに湯温が次第に自然冷却されて低下していく。
【００１７】
そのため、給湯熱交換器15内の湯温が設定温度よりも高くなる後沸き時間ｔ_A内に再出湯を行うと、設定温度よりも高めのオーバーシュートの湯が出湯され、また、後沸き時間ｔ_Aが経過した後にしばらくたって再出湯を行うと、設定温度よりもかなり温めのアンダーシュートの湯が出湯されることとなり、使用者が不快な思いをすることになる。
【００１８】
そこで、本出願人は、給湯燃焼運転停止前の入水温度、出湯温度、出湯流量等の燃焼条件パラメータから求められる給湯燃焼停止時の燃焼熱量を求め、この燃焼熱量から給湯熱交換器15内の残留湯の温度特性を実験や演算等により推定検出し、この推定検出したデータに基づいて再出湯湯温の安定化を行う機能（以下、Ｑ機能と記す）を提案（未公開）している。
【００１９】
この制御は、前記推定温度データに基づいて、再出湯湯温安定化可能時間として予め設定される、給湯燃焼停止時から最長再出湯開始までの設定待機時間の間行われるものであり、たとえば、上記推定温度データに基づいた湯温の降下量Δｋをより早く補償するために立ち上げガス量を増加し、Ｑ機能を行うようにしている。
【００２０】
しかしながら、図６，７に示したような複合給湯器においては、風呂バーナ装置６の燃焼が行われるときに、必ず給湯バーナ装置５側に設けられている燃焼ファン（図６の装置においては共通の燃焼ファン）８の回転も、風呂バーナ装置６の燃焼に対応させて大きなファン回転数で行われるために、たとえば、給湯バーナ装置５を保有熱量が小さいバーナ装置により構成した場合には、燃焼ファン８の回転によって給湯バーナ装置５側に供給される空気により、給湯バーナ装置５がすぐに冷却され、その後、燃焼ファン８からの供給空気によって給湯熱交換器15までが冷却されることとなる。そのため、例えば、図８の特性線ｂに示すように、給湯熱交換器15内の残留湯温の低下の割合が大きく、給湯熱交換器15内の残留湯温が前記推定温度データと異なってしまうために、前記Ｑ機能が達成されず、出湯湯温の安定化を図ることができなくなってしまう。
【００２１】
また、給湯バーナ装置５を保有熱量の大きいバーナ装置により構成した場合には、燃焼ファン８を回転させると、給湯バーナ装置５の保有熱量が給湯熱交換器15側に加わって、例えば図８の特性線ｃに示すように、後沸きが大きくなり、残留湯温が推定温度データと異なってしまい、このときにもＱ機能が達成されず、給湯器の使用者が不快な思いをすることになってしまう。
【００２２】
そこで、このように、風呂バーナ燃焼に伴う燃焼ファン８の回転によって引き起こされる給湯熱交換器15内の残留湯温低下や上昇の度合をできるだけ小さくするために、例えば、前記設定待機時間中に風呂バーナ燃焼が行われたときには、燃焼ファン８の回転数が小さくてすむように、風呂バーナ装置６をできる限り小さい燃焼能力で燃焼させることも考えられるが、そのように、風呂バーナ装置６を小さい燃焼能力で燃焼させると、風呂の沸き上がりまでにかかる時間が非常に長くなり、複合給湯器の使い勝手が悪くなってしまうといった問題が生じる。
【００２３】
また、風呂バーナ装置６を小さい燃焼能力で長い間燃焼させると、燃焼ファン８（又は９）から供給される空気量が小さい状態での燃焼が長く続くことにより、追い焚き熱交換器16等に結露がつき易くなり、その結露が排気ガス中の窒素化合物（ＮＯ_x）や硫黄化合物（ＳＯ_x）等を含み、ドレンと呼ばれる強酸性の水溶液の水滴となって追い焚き熱交換器16等に付着し、それにより追い焚き熱交換器16等の腐食が起こり、寿命が短くなるといった問題も生じる。
【００２４】
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、給湯側の再出湯湯温安定化制御と風呂バーナ燃焼とのバランスを取ることが可能であり、使用者が快く使用することが可能な複合給湯器を提供することにある。
【００２５】
【課題を解決するための手段】
上記目的を達成するために、本発明は次のような構成により課題を解決するための手段としている。すなわち、本第１の発明は、給湯熱交換器の加熱燃焼を行う給湯バーナと、追い焚き熱交換器の加熱燃焼を行う風呂バーナと、前記給湯バーナ燃焼と風呂バーナ燃焼の給排気を行う共通の又は個別の燃焼ファンとを備え、給湯バーナの排気ガスと風呂バーナの排気ガスとが共通の排気口から排出され、前記給湯バーナ燃焼と風呂バーナ燃焼の給排気を個別に行う燃焼ファンが備えられている場合には風呂バーナ燃焼時には前記給湯バーナ燃焼の給排気を行う燃焼ファンと風呂バーナ燃焼の給排気を行う燃焼ファンとの両方の燃焼ファンを回転させるタイプの複合給湯器において、再出湯湯温安定化可能時間として予め設定される給湯燃焼停止時から最長再出湯開始までの設定待機時間中に風呂バーナの燃焼が行われるときの風呂バーナの燃焼能力のデータが風呂能力データとして給湯燃焼停止前の給湯運転条件パラメータに応じて与えられている風呂能力データ記憶部と、給湯燃焼停止時から再出湯に至るまでの時間の経過を計測する経過時間計測手段と、給湯燃焼停止前の給湯運転条件パラメータを記憶する運転条件パラメータ記憶部と、前記設定待機時間中に風呂バーナの燃焼が行われるときに前記運転条件パラメータ記憶部に記憶されている給湯燃焼停止前の給湯運転条件パラメータと風呂能力データ記憶部に記憶されているデータとを照合し、給湯燃焼停止前の給湯運転条件パラメータに応じた風呂能力データの燃焼能力でもって設定待機時間中における風呂バーナの燃焼能力を制御させる風呂能力調整制御部とを有することを特徴として構成されている。
【００２６】
また、第２の発明は前記第１の発明の構成を備えた上で、前記給湯運転条件パラメータは給湯の出湯量によって与えられ、風呂能力データ記憶部には出湯量が基準設定出湯量以上の場合と基準設定出湯量未満の場合に区分されていて、出湯量が基準設定出湯量以上の範囲には最小燃焼能力のデータが、出湯量が基準設定出湯量未満の範囲には最大燃焼能力のデータがそれぞれ与えられていることを特徴とする。さらに、第３の発明は前記第１の発明の構成を備えた上で、前記給湯運転条件パラメータは給湯の出湯量によって与えられ、風呂能力データ記憶部には出湯量の増加量に比例して燃焼能力の減少量を連続的又は段階的に大きくした風呂能力データが与えられていることを特徴とする。
【００２７】
さらに、本第４の発明は、給湯熱交換器の加熱燃焼を行う給湯バーナと、浴槽湯水を循環する追い焚き循環路に組み込まれている追い焚き熱交換器の加熱燃焼を行う風呂バーナと、追い焚き循環路の循環湯水の温度を検出する風呂温度センサと、前記給湯バーナ燃焼と風呂バーナ燃焼の給排気を行う共通の又は個別の燃焼ファンとを備え、給湯バーナの排気ガスと風呂バーナの排気ガスとが共通の排気口から排出され、前記給湯バーナ燃焼と風呂バーナ燃焼の給排気を個別に行う燃焼ファンが備えられている場合には風呂バーナ燃焼時には前記給湯バーナ燃焼の給排気を行う燃焼ファンと風呂バーナ燃焼の給排気を行う燃焼ファンとの両方の燃焼ファンを回転させるタイプの複合給湯器において、再出湯湯温安定化可能時間として予め設定される給湯燃焼停止時から最長再出湯開始までの設定待機時間中に風呂バーナの燃焼が行われるときの風呂バーナの燃焼能力のデータが風呂能力データとして浴槽湯水の温度をパラメータとして与えられている風呂能力データ記憶部と、給湯燃焼停止時から再出湯に至るまでの時間の経過を計測する経過時間計測手段と、前記設定待機時間中に浴槽湯水が追い焚き循環されて風呂バーナの燃焼が行われるときに風呂温度センサによって検出される循環湯水検出温度を取り込み、この循環湯水検出温度に対応する風呂能力データを前記風呂能力データ記憶部のデータから求め、この求めた風呂能力データの燃焼能力でもって設定待機時間中における風呂バーナの燃焼能力を制御させる風呂能力調整制御部とを有することを特徴として構成されている。
【００２８】
また、第５の発明は前記第４の発明の構成を備えた上で、前記風呂能力データ記憶部には浴槽湯水の温度が基準設定温度以上の場合と基準設定温度未満の場合に区分されていて、浴槽湯水の温度が基準設定温度以上の範囲には最小燃焼能力のデータが、基準設定温度未満の範囲には最大燃焼能力のデータがそれぞれ与えられていることを特徴とする。さらに、第６の発明は前記第４の発明の構成を備えた上で、前記風呂能力データ記憶部には浴槽湯水の温度の上昇量に比例して燃焼能力の減少量を連続的又は段階的に大きくした風呂能力データが与えられていることを特徴とする。
【００２９】
さらに、本第７の発明は、給湯熱交換器の加熱燃焼を行う給湯バーナと、浴槽湯水を循環する追い焚き循環路に組み込まれている追い焚き熱交換器の加熱燃焼を行う風呂バーナと、給湯熱交換器の出側の給湯通路と追い焚き循環路とを注湯制御弁を介して連通する注湯通路と、前記給湯バーナ燃焼と風呂バーナ燃焼の給排気を行う共通の又は個別の燃焼ファンとを備え、給湯バーナの排気ガスと風呂バーナの排気ガスとが共通の排気口から排出され、前記給湯バーナ燃焼と風呂バーナ燃焼の給排気を個別に行う燃焼ファンが備えられている場合には風呂バーナ燃焼時には前記給湯バーナ燃焼の給排気を行う燃焼ファンと風呂バーナ燃焼の給排気を行う燃焼ファンとの両方の燃焼ファンを回転させるタイプの複合給湯器において、前記注湯制御弁を開けての湯張りモードと浴槽水位を設定水位に保持する保水モードの機能を備え、再出湯湯温安定化可能時間として予め設定される給湯燃焼停止時から最長再出湯開始までの設定待機時間中に風呂バーナの燃焼が行われるときの風呂バーナの燃焼能力のデータが風呂能力データとして与えられる風呂能力データ記憶部が設けられ、この風呂能力データ記憶部には給湯バーナの燃焼停止前の運転が注湯制御弁を開けての湯張りモードの運転の場合には最大燃焼能力のデータが、保水モードの運転の場合には最小燃焼能力のデータがそれぞれ与えられており、また、給湯燃焼停止時から再出湯に至るまでの時間の経過を計測する経過時間計測手段と、給湯燃焼による湯張りモードの運転あるいは保水モードの運転が行われたときにはその運転モードの情報を少なくとも給湯燃焼停止後再出湯に至る間に記憶する運転条件パラメータ記憶部と、前記設定待機時間中に風呂バーナの燃焼が行われるときに前記運転条件パラメータ記憶部に記憶されている給湯燃焼停止前の給湯の運転モードの情報を読み出して風呂能力パラメータ記憶部のデータと照合し、給湯燃焼停止前の給湯の運転モードの情報に応じた燃焼能力でもって設定待機時間中における風呂バーナの燃焼能力を制御させる風呂能力調整制御部とを有することを特徴として構成されている。
【００３０】
さらに、第８の発明は前記第１乃至第７のいずれか１つの発明の構成を備えたものにおいて、前記給湯燃焼停止時から再出湯開始までの設定待機時間の終点からその手前側に解除区間が設定され、設定待機時間の開始から前記解除区間の開始までの時間内に風呂バーナの使用がないことが検知されたときに、それ以降の給湯燃焼停止中における風呂バーナの燃焼に際しての風呂能力調整制御部の機能を停止する能力調整停止部が設けられていることを特徴とする。
【００３１】
さらに、第９の発明は前記第８の発明の構成を備えたものにおいて、前記器具内温度を検出する器具内温度センサが設けられ、この器具内温度センサによって検出される器具内検出温度が予め与えられる器具内基準温度よりも低下したときにはその温度低下量に応じて連続的に又は段階的に解除区間の時間幅を小さくする方向に補正する解除区間設定部が設けられていることを特徴とする。さらに、第１０の発明は前記第８の発明の構成を備えたものにおいて、前記器具内温度を検出する器具内温度センサと、器具内温度によって可変する解除区間のデータが器具内温度に対応させて与えられているメモリと、器具内温度センサによって検出される器具内検出温度を取り込み前記メモリの記憶データから器具内検出温度に対応する解除区間を設定する解除区間設定部が設けられていることも本発明の特徴的な構成とされている。
【００３２】
上記構成の本第１の発明において、風呂能力データ記憶部には、再出湯湯温安定化可能時間として予め設定される給湯燃焼停止時から最長再出湯開始までの設定待機時間中に風呂バーナの燃焼が行われるときの風呂バーナの燃焼能力のデータが、風呂能力データとして給湯燃焼停止前の給湯運転条件のパラメータに応じて与えられており、前記設定待機時間中に再出湯が開始されずに風呂バーナの燃焼が行われるときには、風呂能力調整制御部により、給湯燃焼停止前の給湯運転条件パラメータと風呂能力データ記憶部に記憶されているデータとの照合が行われ、給湯燃焼停止前の給湯運転条件パラメータに応じた風呂能力データの燃焼能力でもって、風呂バーナの燃焼能力が制御される。
【００３３】
そのため、給湯運転条件パラメータが給湯の出湯量によって与えられているときには、例えば、出湯量が風呂能力データ記憶部に与えられている基準設定出湯量以上の範囲のときには最小燃焼能力で風呂バーナ燃焼が制御され、出湯量が基準設定出湯量未満の範囲のときには最大燃焼能力で風呂バーナ燃焼の制御が行われたり、あるいは、風呂能力データ記憶部に与えられている、給湯の出湯量の増加量に比例して燃焼能力の減少量を連続的又は段階的に大きくした風呂能力データに応じた風呂バーナ燃焼の制御が行われる。
【００３４】
また、上記構成の本第４の発明においては、風呂能力データ記憶部には、再出湯湯温安定化可能時間として予め設定される給湯燃焼停止時から最長再出湯開始までの設定待機時間中に風呂バーナの燃焼が行われるときの風呂バーナの燃焼能力のデータが、風呂能力データとして浴槽湯水の温度をパラメータとして与えられており、前記設定待機時間中に再出湯が行われずに浴槽湯水が追い焚き循環されて風呂バーナの燃焼が行われるときには、風呂温度センサによって検出される循環湯水検出温度に基づいて、風呂能力調整制御部によって風呂バーナの燃焼能力制御が行われる。
【００３５】
そのため、例えば、前記循環湯水検出温度が、風呂能力データ記憶部に与えられている基準設定温度以上の範囲のときには最小燃焼能力で風呂バーナ燃焼が行われ、循環湯水検出温度が基準設定温度未満の範囲のときには最大燃焼能力で風呂バーナ燃焼の制御が行われたり、あるいは、風呂能力データ記憶部に与えられている、浴槽湯水の温度の上昇量に比例して燃焼能力の減少量を連続的又は段階的に大きくした風呂能力データに基づいて、循環湯水検出温度に対応した風呂バーナ燃焼能力制御が行われる。
【００３６】
さらに、上記構成の本第７の発明においては、風呂能力データ記憶部には、再出湯湯温安定化可能時間として予め設定される給湯燃焼停止時から最長再出湯開始までの設定待機時間中に風呂バーナの燃焼が行われるときの風呂バーナの燃焼能力のデータが、風呂能力データとして、給湯バーナの燃焼停止前の運転が湯張りモードか保水モードかに対応させて風呂能力データとして与えられており、前記設定待機時間中に再出湯が行われずに風呂バーナの燃焼が行われるときには、風呂能力調整制御部により、給湯燃焼停止前の給湯の運転モードの情報に応じて、湯張りモードのときには最大燃焼能力でもって設定待機時間中における風呂バーナの燃焼能力制御が行われ、保水モードのときには最小燃焼能力でもって風呂バーナの燃焼能力制御が行われる。
【００３７】
以上のように、本発明においては、前記設定待機時間中に風呂バーナ燃焼が行われるときの風呂バーナの燃焼能力データが、例えば給湯燃焼停止前の運転条件パラメータや、設定待機時間中に行われる風呂バーナ燃焼時の浴槽湯水温度等に基づいて、風呂バーナ燃焼と再出湯湯温安定化制御とのバランスを取るための制御データとして風呂能力データ記憶部に与えられ、この制御データに応じて風呂バーナ燃焼能力調整が行われるために、設定待機時間中における風呂バーナ燃焼と再出湯湯温安定化制御とのバランスが図られ、上記課題が解決される。
【００３８】
なお、上記のような風呂バーナの燃焼能力調整制御が行われているときに、再出湯が開始されたときには風呂バーナの燃焼動作は通常運転動作に復帰し、また、燃焼能力調整制御状態の風呂バーナ燃焼中に再出湯が開始されずに給湯燃焼停止時からの経過時間が設定待機時間を越えてしまったときには、給湯熱交換器の残留湯は冷え切ってしまいコールドスタートとなるために、再出湯湯温の安定化動作を継続する必要がなく、上記風呂燃焼能力の調整制御動作は停止され、風呂バーナの燃焼動作は通常運転動作に復帰する。
【００３９】
さらに、給湯燃焼停止時から再出湯開始までの設定待機時間の終点からその手前側に解除区間が設定されているものにおいては、前記設定待機時間の開始から前記解除区間の開始までの時間内に風呂バーナの使用がないことが検知されたときに、能力調整停止部により、解除区間開始以降の給湯燃焼停止中における風呂バーナの燃焼に際しての風呂能力調整制御部の機能が停止される。
【００４０】
また、器具内温度を検出する器具内温度センサが設けられ、この器具内温度センサによって検出される器具内検出温度によって、前記解除区間の時間幅を補正したり、解除区間を設定したりする解除区間設定部が設けられているものにおいては、器具内温度センサの検出温度によって解除区間の調整が行われる。
【００４１】
【発明の実施の形態】
以下、本発明の実施の形態例を図面に基づいて説明する。なお、本実施形態例の説明において、従来例と同一名称部分には同一符号を付し、その重複説明は省略する。本実施形態例の複合給湯器は、図６Ｒ＞６に示したシステム構成の複合給湯器を対象にしており、本実施形態例が従来例と異なる特徴的なことは、再出湯湯温安定化のＱ機能を備え、かつ、この再出湯湯温安定化可能時間として与えられる設定待機時間中に風呂バーナ燃焼が行われたときの、風呂バーナ燃焼の能力を制御する特有な回路を構成したことである。また、本実施形態例では、図６，７の破線で示したように、給湯バーナ装置５側のガスノズルホルダ１２の側面側に器具内の温度を検出する器具内温度センサ５３が設けられている。
【００４２】
図１には、以下に説明する本実施形態例の特有な回路構成（制御装置56の構成）が示されており、同図に示すように、この回路は、給湯燃焼制御部43、風呂燃焼制御部48、経過時間計測手段44、運転条件パラメータ記憶部49、風呂能力データ記憶部51、能力調整停止部45、メモリ46、風呂能力調整制御部50を有して構成されており、必要に応じて、解除区間設定部54が設けられるようになっている。
【００４３】
給湯燃焼制御部43は、従来例と同様に、給湯モード、湯張りモード、保水モード等の各モードでの給湯燃焼運転を制御するものであり、各制御の詳細は従来例と同様であるので、その説明は省略する。なお、本実施形態例の給湯燃焼制御部43は、台所等の給湯栓が閉められて流量センサ41が水の流れの停止を検知し流量停止信号を出力すると、給湯燃焼停止信号を経過時間計測手段44に出力し、その逆に、給湯栓が開けられて流量センサ41が流水を検知し、流水信号を出力すると、給湯燃焼開始信号を出力する。また、給湯燃焼停止時に、給湯燃焼停止前の給湯運転条件パラメータを運転条件パラメータ記憶部49に加える。
【００４４】
運転条件パラメータ記憶部49は、給湯燃焼制御部43から加えられる燃焼運転停止前の給湯の出湯量等の給湯運転条件パラメータを記憶する。
【００４５】
経過時間計測手段44はタイマ（以下Ｑタイマと記す）を有して構成され、給湯燃焼制御部43からの給湯燃焼停止信号を受けて、給湯バーナ装置５の燃焼が停止し再出湯待機状態となったと判断し、Ｑタイマをタイマ駆動させると共に再出湯待機開始信号を風呂能力調整制御部50と能力調整停止部45に出力する。Ｑタイマ駆動状態で給湯栓が開けられて給湯燃焼制御部43から給湯燃焼開始信号が出力されると、再出湯開始であると判断してＱタイマを停止させ、同時に再出湯開始信号を能力調整停止部45に出力し、次の再出湯待機時間計測に備えＱタイマをリセットする。
【００４６】
風呂能力データ記憶部51には、前記設定待機時間中に再出湯が行われずに風呂バーナ装置６の燃焼が行われるときの風呂バーナ装置６の燃焼能力のデータが、風呂能力データとして、浴槽湯水の温度をパラメータとして与えられており、浴槽湯水の追い焚き循環により循環ポンプ23を駆動させたときに、風呂温度センサ24によって検出される浴槽の循環湯水検出温度が予め与えられる基準設定温度以上の場合と基準設定温度未満の場合に区分され、図２の（ａ）に示すように、浴槽湯水の温度が基準設定温度Ａ以上の範囲には最小燃焼能力のデータが、基準設定温度未満の範囲には最大燃焼能力のデータがそれぞれ与えられている。
【００４７】
風呂能力調整制御部50は、前記Ｑ機能待機中に浴槽湯水が追い焚き循環されて風呂バーナ装置６の燃焼が行われるときに、風呂温度センサ24によって検出される循環湯水検出温度（風呂入水温度）を取り込み、この循環湯水検出温度に対応する風呂能力データを風呂能力データ記憶部51のデータから求め、この求めた風呂能力データの燃焼能力でもって設定待機時間中における風呂バーナ装置６の燃焼能力を風呂燃焼制御部48によって制御させるものである。風呂能力調整制御部50は、給湯燃焼が停止したことを示す経過時間計測手段44の再出湯待機開始信号を受けると能力調整制御待機状態となり、この状態で、風呂バーナ装置６側のフレームロッド電極（図示せず）が火炎を検知すると、風呂バーナ装置６の燃焼が行われたと判断して、下記の能力調整制御指令動作を開始する構成となっている。
【００４８】
なお、風呂バーナ装置６の燃焼が給湯燃焼停止以前から給湯燃焼停止以降も引き続き行われる場合にも、給湯燃焼停止時に下記の能力調整制御指令動作を開始し、また、給湯燃焼停止時から再出湯開始時あるいは設定待機時間までの間に何度も風呂バーナ装置６の燃焼の開始・停止が繰り返されるときには風呂バーナ装置６の燃焼開始の度に下記能力調整制御指令動作を行う。
【００４９】
風呂能力調整制御部50は、風呂温度センサ24によって検出される循環湯水検出温度の値を受けて、この循環湯水検出温度が前記図２の（ａ）に示した基準設定温度Ａ未満のときには、風呂燃焼制御部48に最大燃焼指令を加え、風呂燃焼制御部48によってガス比例弁38の開弁量および燃焼ファン８の回転数等を制御させて、風呂バーナ装置６の燃焼能力が最大となるように制御させる。また、前記循環湯水検出温度が基準設定温度Ａ以上のときには、風呂燃焼制御部48に最小燃焼指令を加え、ガス比例弁38の開弁量や燃焼ファン８の回転数等の制御により風呂バーナ装置６が最小燃焼能力で燃焼するように制御させる。また、循環湯水検出温度（風呂戻り湯温）が基準設定温度Ａ付近のときのハンチング防止のために、図２の破線に示すようにヒステリシスを持たせてもよい。
【００５０】
なお、風呂温度センサ24によって検出される循環湯水検出温度は、風呂燃焼制御部48から間接的に取り込んでもよいし、図１の鎖線に示すように、風呂温度センサ24から直接取り込むようにしてもよい。
【００５１】
メモリ46には、例えば、図３に示すように、再出湯湯温の安定化時間としての設定待機時間Ｔ_R（例えば510 秒）と、設定待機時間Ｔ_Rの終点から手前側に設けられる解除区間Ｔ_S（例えば90秒）が予め与えられている。
【００５２】
能力調整停止部45は、給湯燃焼停止を示す前記経過時間計測手段44の再出湯待機開始信号を受けると、前記経過時間計測手段44のＱタイマの計測時間（給湯燃焼停止時からの経過時間）Ｔ_Qのサンプリングを開始し、また、前記メモリ46から設定待機時間Ｔ_R（例えば510 秒）および解除区間Ｔ_S（例えば90秒）を読み出し、前記Ｔ_RからＴ_Sを差し引いた能力調整制御待機時間（例えば420 秒）を算出する。
【００５３】
能力調整停止部45は、給湯燃焼停止時からの経過時間Ｔ_Qが前記解除区間内に入ったことを示す能力調整制御待機時間を越えるまで、風呂バーナ装置６の燃焼が行われなかったことを検知したときには、前記解除区間内に、風呂バーナ装置６の燃焼が開始され燃焼ファン８が回転駆動しても燃焼ファン８の回転駆動に起因する冷却促進現象（設定待機時間Ｔ_Rの終点付近においては、給湯バーナ装置５の保有熱量にかかわらず、燃焼ファン８の回転により冷却促進現象が生じる）の度合は小さく、例えば、風呂燃焼能力を最小燃焼とする制御指令を行わなくても再出湯湯温の安定化を成すことができると判断して、前記風呂能力調整制御部50に能力調整制御待機状態解除用の解除信号を出力する。風呂能力調整制御部50では、解除信号を受けて能力調整制御待機状態を解除し、これ以降に風呂バーナ装置６の燃焼開始を検知しても前記能力調整制御指令動作は行われない。
【００５４】
また、能力調整停止部45は、給湯燃焼停止中における前記解除区間の以前に風呂燃焼能力の調整制御が開始・継続されている状態で、再出湯が開始されずに給湯燃焼停止時からの経過時間Ｔ_Qが再出湯湯温安定化可能時間である設定待機時間Ｔ_Rを越えたときには、給湯熱交換器15の残留湯は冷え切ってしまいコールドスタートとなるために風呂燃焼能力の調整制御による再出湯湯温の安定化動作を継続する必要がないと判断し、能力調整制御停止用の停止信号を風呂能力調整制御部45に出力する。
【００５５】
風呂能力調整制御部50では、上記停止信号を受けると能力調整制御停止信号を風呂燃焼制御部48に出力する。
【００５６】
また、能力調整停止部45は、給湯燃焼開始を示す再出湯開始信号を経過時間計測手段44から受け取ると、能力調整制御停止用の停止信号を風呂能力調整制御部50に出力し、風呂能力調整制御部50は能力調整制御待機状態のとき（Ｑ機能待機中）にはその状態を解除し、前記風呂燃焼能力調整制御中であるときには能力調整制御停止信号を風呂燃焼制御部48に出力する。
【００５７】
風呂燃焼制御部48は、風呂能力調整制御部50から加えられる最大又は最小燃焼制御指令を受けて、能力調整制御待機状態、すなわち、Ｑ機能待機中には、風呂温度センサ24によって検出される循環湯水検出温度に応じた風呂バーナ装置６の燃焼能力制御を行い、Ｑ機能待機中以外（風呂能力調整制御部45から風呂能力調整停止信号を受けたときを含む）のときには、従来例と同様に風呂バーナ装置６による風呂燃焼の制御を行う。
【００５８】
本実施形態例は以上のように構成されており、本実施形態例でも従来例と同様に、給湯燃焼制御部43および風呂燃焼制御部48により、それぞれ、給湯モード、湯張りモード、追い焚きモード、保温モード等の各モードでの動作制御が行われ、また、本実施形態例では、Ｑ機能を備えた複合給湯器であるために、Ｑ機能待機中に再出湯が行われたときには、前記のように、給湯燃焼運転停止前の燃焼熱量から推定検出される推定温度データに基づいて再出湯湯温安定化制御が行われる。そして、本実施形態例においては、Ｑ機能待機中に風呂バーナ装置６の燃焼が行われるときには、風呂温度センサ24によって検出される循環湯水検出温度（風呂戻り湯温）に対応させて、風呂能力調整制御部50が最大燃焼指令又は最小燃焼指令を風呂燃焼制御部48に加え、風呂燃焼制御部48による風呂バーナ装置６の燃焼能力制御が行われる。
【００５９】
図４には、Ｑ機能待機中に風呂バーナ装置６の燃焼が行われるときの本実施形態例の動作がフローチャートにより具体的に示されている。同図に示ように、ステップ101 で、台所等の給湯栓（図示せず）が閉められて流量センサ41により水の流れの停止が検知され、出湯停止信号が出力されると、ステップ102 で、経過時間計測手段44のＱタイマがオンとなり、Ｑタイマの駆動開始からの経過時間Ｔ_Qが測定され、能力調整停止部45、風呂能力調整制御部50に加えられる。
【００６０】
そして、風呂能力調整制御部50により、この経過時間Ｔ_Qの値が、メモリ46に予め与えらている設定待機時間Ｔ_Rおよび解除区間Ｔ_Sから求められる能力調整制御待機時間と比較され、この能力調整制御待機時間中に再出湯が行われずに、ステップ103 に示すように、風呂バーナ装置６の燃焼が行われたときには、ステップ104 で、風呂能力調整制御部50は、風呂温度センサ24により検出される循環湯水検出温度を前記基準設定温度Ａと比較し、循環湯水検出温度が前記基準設定温度Ａ以上のときには、ステップ106 で、風呂燃焼号数を小さくして、最小燃焼能力での風呂バーナ燃焼を行うように、風呂燃焼制御部48に最小燃焼指令を加え、風呂燃焼制御部48によって、最小燃焼能力でのバーナ燃焼制御を行う。
【００６１】
一方、ステップ104 で、循環湯水検出温度が基準設定温度Ａ未満であると判断されたときには、風呂能力調整制御部50は、ステップ105 で、風呂燃焼号数を大きくして最大燃焼能力で風呂バーナ燃焼を行うように最大燃焼指令を風呂燃焼制御部48に加え、風呂燃焼制御部48によって、最大燃焼能力での風呂バーナ燃焼制御を行う。
【００６２】
そして、これらの制御は、ステップ107 で、給湯側での再出湯が行われるか、ステップ108 で、Ｑタイマから出力される経過時間Ｔ_Qが前記能力調整制御待機時間の終了に達するまでの間行われることになる。
【００６３】
本実施形態例によれば、上記動作により、Ｑ機能待機中に風呂バーナ装置６の燃焼が行われるときに、循環湯水検出温度に応じて、循環湯水温度が風呂の設定温度よりも少し低めの基準設定温度Ａ以上のときには、風呂バーナ装置６の燃焼能力が最小燃焼能力とされるために、このときの燃焼ファン８の回転数は小さく、したがって、給湯熱交換器15内の残留湯温が、図８の特性線ｂに示すように極端に低下したり、特性線ｃに示すように後沸きの温度が極端に上昇したりするようなことはなく、給湯燃焼停止前の燃焼熱量によって推定検出される推定温度特性線ａにほぼ近い残留湯温特性が得られる。そのため、前記設定待機時間Ｔ_R中に再出湯が行われたときに、特性線ａに基づいて再出湯湯温安定化制御を図ることが可能となり、Ｑ機能を達成することができる。
【００６４】
また、前記循環湯水検出温度が前記基準設定温度Ａ未満であり、例えば、浴槽湯水が水の状態から追い焚きを行って風呂を沸かすようなときには、風呂燃焼号数を大きくして最大燃焼能力での風呂バーナ燃焼が行われるために、Ｑ機能のみを有する燃焼装置と異なり、風呂の追い焚き運転を最短時間で行うことが可能となる。
【００６５】
なお、このように、最大燃焼能力で風呂バーナ燃焼が行われているときに、給湯側での再出湯が行われたときには、出湯湯温がリモコンによる設定温度から外れた湯温となるが、通常、風呂を水から沸かしながらシャワーを用いることはあまりないために、出湯湯温の変動による支障はあまりない。また、循環湯水検出温度が基準設定温度以上であり、風呂の設定温度に近いときには、最小燃焼能力で風呂バーナ燃焼を行っても、追い焚きに長い時間がかかって利用者が不快な思いをすることはなく、また、循環湯水検出温度が高いときには、風呂バーナ装置６の燃焼能力を小さくしても、追い焚き熱交換器16等に結露が生じ易いことはなく、結露による追い焚き熱交換器16の耐久性の低下等の問題はない。
【００６６】
次に、本発明の複合給湯器の第２の実施形態例について説明する。本実施形態例も上記第１の実施形態例と同様に、図１に示す制御部回路構成を有しており、本実施形態例が上記第１の実施形態例と異なる特徴的なことは、風呂能力データ記憶部51に、設定待機時間中に再出湯が行われずに風呂バーナ装置６の燃焼が行われるときの風呂バーナ装置６の燃焼能力のデータが給湯燃焼停止前の給湯運転条件パラメータに応じて与えられていることと、風呂能力調整制御部50が、風呂能力データ記憶部51に記憶されているデータと前記運転条件パラメータ記憶部49に記憶されている給湯燃焼停止前の給湯運転条件パラメータとを照合して風呂バーナ装置６の燃焼能力を制御させるようにしたことである。
【００６７】
本実施形態例では、風呂能力データ記憶部51には、給湯燃焼停止前の給湯運転条件パラメータは給湯の出湯量によって与えられており、図２の（ａ）に示したグラフの横軸を、循環湯水温度の代わりに給湯運転停止前の出湯量に置き換えたデータが与えられており、風呂能力は出湯量が基準設定出湯量以上の場合と基準設定出湯量未満の場合に区分されている。そして、出湯量が基準設定出湯量以上の範囲には最小燃焼能力のデータが、出湯量が基準設定出湯量未満の範囲には最大燃焼能力のデータが与えられている。なお、このグラフデータにも、上記第１の実施形態例と同様に、ハンチング防止のために、同図の破線に示すようなヒステリシスを持たせてもよい。
【００６８】
本実施形態例の上記以外の構成は前記第１の実施形態例と同様に構成されている。そして、本実施形態例では、図４に示したフローチャートにおけるステップ104 の風呂能力調整制御部50による判断動作を、給湯燃焼停止前の出湯量によって行い、出湯量が基準設定出湯量以上の場合には、ステップ106 で風呂燃焼号数を小さくして最小燃焼能力での風呂バーナ燃焼制御が行われ、前記出湯量が基準設定出湯量未満のときには、ステップ105 で風呂燃焼号数を大きくして最大燃焼能力での風呂バーナ燃焼制御が行われる。
【００６９】
そのため、本実施形態例によれば、給湯燃焼停止前の出湯量が多く、複合給湯器の利用者が、シャワー等を断続的に利用していると推定されるときには、風呂バーナ燃焼よりもＱ機能の達成が優先されるために、再出湯湯温の変動が小さくなり、湯温変動に敏感な体の部分に湯を受けても利用者は快く湯を利用することが可能となり、一方、出湯量が少く、台所等で少量の湯の出湯が断続的に行われていると推定されるときには、風呂バーナ燃焼が優先されて風呂の沸き上がり時間を早くすることが可能となり、上記第１の実施形態例と同様の効果を奏することができる。
【００７０】
次に、本発明の複合給湯器の第３の実施形態例について説明する。本実施形態例も上記第１、第２の実施形態例と同様のシステム構成を有し、図１に示す制御回路を有している。本実施形態例が上記実施形態例と異なる特徴的なことは、風呂能力データ記憶部51に、設定待機時間中に再出湯が行われずに風呂バーナ装置６の燃焼が行われるときの風呂バーナ装置６の燃焼能力のデータが、給湯バーナ装置５の燃焼停止前の運転が湯張りモードの運転と保水モードの運転の場合とに応じて与えられていることと、風呂能力調整制御部50が、このモードの違いに対応させて風呂バーナ燃焼を制御するようにしたことである。
【００７１】
本実施形態例における風呂能力データ記憶部51には、給湯バーナ装置６の燃焼停止前の運転が注湯弁35を開けての湯張りモードの運転の場合には最大燃焼能力のデータが風呂能力データとして与えられており、保水モードの運転の場合には最小燃焼能力のデータが風呂能力データとして与えられている。
【００７２】
風呂能力調整制御部50は、Ｑ機能待機中に風呂バーナ装置６の燃焼が行われるときには、運転条件パラメータ記憶部49に記憶されている給湯燃焼停止前の給湯の運転モードの情報を読み出して、風呂能力データ記憶部51のデータと照合し、給湯燃焼停止前の給湯の運転モードの情報に応じた燃焼能力でもってＱ機能待機中における風呂バーナ装置６の燃焼能力を制御させる。
【００７３】
本実施形態例は以上のように構成されており、図５のフローチャートに示すように、ステップ201 で給湯バーナ装置５の燃焼が行われていると判断されるときに、ステップ208 で、注湯弁35が開いているか否かを判断し、注湯弁35が開いているときには、ステップ209 で注湯弁ＯＮ実績フラグをセットし、一方、注湯弁35が閉じているときには、ステップ210 で、注湯弁ＯＮ実績フラグをクリアし、その状態でステップ201 に戻り、ステップ201 で、給湯燃焼が停止されたと判断したときには、ステップ202 に進む。
【００７４】
そして、ステップ202 で、風呂バーナ装置６の燃焼が行われたと判断されたときには、ステップ203 で、Ｑ機能待機中か否かを判断し、Ｑ機能待機中でないときには、ステップ207 で、最大燃焼能力での風呂バーナ燃焼を行い、Ｑ機能待機中のときには、ステップ204 に進む。
【００７５】
ステップ204 では、複合給湯器が保温モードでの動作中であるか否かを判断し、保温モードでの動作中であると判断されたときには、たとえ、給湯燃焼停止前に注湯弁35が開けられて注湯が行われていたとしても、この注湯は保水モードの動作による注湯であり、循環湯水検出温度はほぼ設定温度付近であるため、このときの風呂バーナ燃焼は、ステップ206 で、最小燃焼能力での燃焼が行われる。
【００７６】
また、ステップ204 で、保温モードでの動作中でないと判断されたときには、ステップ205 で、注湯弁ＯＮ実績フラグがセットされているか否かを判断し、セットされているときには、給湯燃焼停止前の注湯が注湯弁35を開けての湯張りモードでの動作中であったと判断されるために、このときには、ステップ207 で、風呂バーナ装置６の燃焼が最大燃焼能力で行われ、ステップ205 で、注湯弁ＯＮ実績フラグがセットされていないと判断されたときには、給湯燃焼停止前の動作が湯張りモードでの動作中ではなかったと判断されるために、ステップ206 で最小燃焼能力での風呂バーナ燃焼が行われる。
【００７７】
本実施形態例によれば、上記動作により、Ｑ機能待機中に風呂バーナ装置６の燃焼が行われたときに、給湯燃焼停止前の注湯動作が、湯張りモードでの動作であり、風呂を早く沸かす必要があるときには、Ｑ機能を達成するよりも風呂バーナ燃焼を優先させて最大燃焼能力での燃焼が行われるために、風呂の沸き上がり時間を早くすることが可能となり、一方、給湯燃焼停止前の動作が保温モード中の保水モードでの動作であり、循環湯水検出温度はほぼ設定温度付近であるために、小さい燃焼能力で風呂バーナ燃焼を行っても沸き上がりに長い時間がかからないようなときには、Ｑ機能の達成が行われることになり、上記第１、第２の実施形態例と同様の効果を奏する。
【００７８】
次に、本発明の複合給湯器の第４の実施形態例を図１に基づいて説明する。本実施形態例が前記第１、第２、第３の実施形態例と異なる最も特徴的なことは、解除区間設定部54が設けられることである。なお、本実施形態例では、メモリ46には、前記の如く、設定待機時間Ｔ_R（例えば510 秒）、解除区間Ｔ_S（例えば90秒）が予め与えられると共に、器具内基準温度および解除区間補正データが予め実験や演算等により求め与えられている。上記解除区間補正データは、上記器具内基準温度に対する器具内温度の降下量が大きくなるに伴い、解除区間を短縮させる方向に解除区間を補正するための補正区間のデータであり、補正区間が上記器具内温度の降下量に連続的又は段階的に対応した表データやグラフデータとして、あるいは演算式データとして与えられている。
【００７９】
解除区間設定部54は、給湯燃焼が停止して給湯燃焼制御部43が給湯燃焼停止信号を出力すると、器具内温度センサ53における検出器具内温度の取り込みを開始し、この検出器具内温度と前記メモリ46の器具内基準温度とを比較し、検出器具内温度が器具内基準温度より低いときには、器具内基準温度から検出器具内温度を差し引き、器具内基準温度に対する検出器具内温度の降下量を算出する。
【００８０】
解除区間Ｔ_Sは、器具内温度が器具内基準温度以上であると想定して設定されたものであり、器具内温度が器具内基準温度より下がってしまったときには、その低下分だけ風呂バーナ燃焼に伴う燃焼ファンの回転駆動に起因する冷却促進現象が大きく現れてしまう。その大きく現れる冷却促進現象分を抑制するために、器具内基準温度に対する器具内温度の降下分だけ解除区間Ｔ_Sを短縮する方向に補正する必要が生じてくる。
【００８１】
そこで、解除区間設定部54は、前記の如く、検出器具内温度が器具内基準温度より下がりその降下量が算出されると、降下量の大きさに応じて解除区間を短縮する補正を行う必要があると判断し、算出降下量を前記メモリ46の解除区間補正データに照合し算出降下量に対応する補正区間を検出し、前記メモリ46の解除区間Ｔ_Sを読み出し解除区間Ｔ_Sを補正区間分だけ短縮する方向に補正し、補正解除区間を能力調整停止部45に出力する。
【００８２】
なお、上記器具内温度センサ53における検出器具内温度の取り込み、および検出器具内温度と器具内基準温度との比較動作は、給湯燃焼停止開始時から補正解除区間（補正が行われていないときには解除区間Ｔ_S）の開始時まで繰り返し行われ、検出器具内温度と器具内基準温度との比較の結果、器具内基準温度に対して検出器具内温度が低下しているときには、補正解除区間は検出・継続される。
【００８３】
能力調整停止部45は、解除区間設定部54の補正解除区間（例えば80秒）を受けると、設定待機時間Ｔ_R（例えば510 秒）から補正解除区間を差し引いて補正能力調整制御待機時間（例えば430 秒）を算出し、以前に算出した能力調整制御待機時間（例えば420 秒）を補正能力調整制御待機時間（430 秒）に置き換え、能力調整制御待機時間の変更を行う。
【００８４】
また、能力調整停止部45は第１〜第３の実施形態例同様に経過時間計測手段44の計測時間をサンプリングし、給湯燃焼停止時からの経過時間Ｔ_Qが能力調整制御待機時間を越えると、前記解除区間設定部54の解除区間補正動作を終了させる。
【００８５】
第４の実施形態例によれば、上記第１〜第３の実施形態例と同様の効果を奏し、さらに、器具内温度が器具内基準温度より下がっているために冷却促進現象が想定されたものより大きく現れる場合にも、器具内基準温度に対する器具内温度の降下量に応じて解除区間を短縮補正するので、冷却促進現象が想定されたものより大きくなった影響時間部分を解除区間から外すことができ、器具内温度の大きな降下があっても確実に再出湯湯温の安定化を行うことができる。
【００８６】
以下に第５の実施形態例を図１に基づいて説明する。本実施形態例が上記第４の実施形態例と異なる特徴的なことは、解除区間が予め固定的に与えられるのではなく、解除区間設定部54が器具内温度に応じて解除区間を自ら設定するようにしたことである。なお、本実施形態例では、メモリ46には、上記実施形態例と同様に設定待機時間Ｔ_Rが予め与えられており、本実施形態例では、器具内温度が下がるにつれて解除区間が短くなる解除区間のデータが実験や演算等により求められ器具内温度に連続的又は段階的に対応させた表データやグラフデータとして、あるいは演算式データとして与えられている。
【００８７】
解除区間設定部54は、給湯燃焼が停止し給湯燃焼制御部43が給湯燃焼停止信号を出力すると、器具内温度センサ53が検出する器具内温度のサンプリングを開始し、この器具内温度のサンプリング値を前記メモリ46の解除区間データに照合し、サンプリング値に対応する解除区間を検出設定し、能力調整停止部45に出力する。なお、解除区間は器具内温度のサンプリングの度に検出されて更新設定される。
【００８８】
能力調整停止部45は、上記解除区間設定部54で検出設定された解除区間を受け取ると、設定待機時間Ｔ_Rから解除区間を差し引き能力調整制御待機時間を算出し、以前に能力調整制御待機時間が算出されているときには前の能力調整制御待機時間を新たに算出した能力調整制御待機時間に置き換え、能力調整制御待機時間の変更を行う。
【００８９】
また、能力調整停止部45は、第１〜第３の実施形態例と同様に経過時間計測手段44の計測時間をサンプリングし、給湯燃焼停止時からの経過時間Ｔ_Qが検出された解除区間内に入ったことを示す能力調整制御待機時間を越えると、解除区間の設定を行う必要がないと判断して解除区間設定終了用の信号を解除区間設定部54に出力し、解除区間の設定動作を終了させる。
【００９０】
上記以外の構成は、第４の実施形態例と同様であるのでその説明は省略する。
【００９１】
第５の実施形態例によれば、器具内温度に対応させて解除区間を設定するので、前記第４の実施形態例同様の優れた効果を奏することができる。
【００９２】
なお、本発明は、上記各実施形態例に限定されるものではなく、様々な実施の態様を採り得る。例えば、上記各実施形態例では、給湯燃焼制御部43の流量センサ41が流水停止・流水開始を検知したときに給湯燃焼が停止あるいは開始したと判断し、給湯燃焼停止を知らせる信号あるいは給湯燃焼開始を知らせる信号を出力していたが、フレームロッド電極等の他のセンサ出力情報や、給湯バーナ装置５のガス供給通路の電磁弁37の開・閉弁信号により給湯燃焼の開始・停止信号を判断し、上記の如く、給湯燃焼の開始・停止を示す信号を出力してもよい。
【００９３】
また、上記第１の実施形態例では、風呂能力データ記憶部51には、図２の（ａ）に示したように、浴槽湯水の温度が基準設定温度以上の範囲には最小燃焼能力のデータを与え、浴槽湯水温度が基準設定温度未満の範囲には最大燃焼能力のデータを与えたが、風呂能力データ記憶部51には、例えば、図２の（ｂ），（ｃ）に示すように、浴槽湯水の温度の上昇量に比例して、燃焼能力の減少量を連続的又は段階的に大きくした風呂能力データを与えてもよい。なお、同図の（ｃ）に示すような風呂能力データを与えるに際し、同図の破線に示すように、ハンチング防止のためにヒステリシスを設けてもよい。
【００９４】
そして、このような風呂能力データが風呂能力データ記憶部51に与えられたときにも、風呂能力調整制御部50は、このような関係データに基づいて循環湯水検出温度に対応する風呂能力データを求めて、求めた風呂能力データの燃焼能力でもってＱ機能待機中における風呂バーナ装置６の燃焼能力を制御させるようにする。
【００９５】
また、上記第２の実施形態例では、風呂能力データ記憶部51には、給湯燃焼停止前の給湯の出湯量が、基準設定出湯量以上の範囲には最小燃焼能力のデータを与え、出湯量が基準設定出湯量未満の範囲には最大燃焼能力のデータをそれぞれ与えたが、風呂能力データを給湯の出湯量によって与える場合にも、例えば図２の（ｂ）又は（ｃ）に示すように、出湯量の増加量に比例して燃焼能力の減少量を連続的又は段階的に大きくした風呂能力データを与えてもよい。この場合にも、同図の（ｃ）の破線に示すように、ハンチング防止のためにヒステリシスを設けてもよい。
【００９６】
このように、風呂能力データ記憶部51に与える風呂能力データとして、図２の（ｂ），（ｃ）に示すような、浴槽湯水の温度の上昇量や給湯運転停止前の出湯量の増加量に比例して燃焼能力の減少量を大きくすれば、例えば浴槽湯水の温度の違いにより風呂バーナ燃焼能力をきめ細かく調整制御したり、シャワー等を利用する人によって利用時の出湯量が異なっていても、その出湯量に応じてＱ機能待機中の風呂バーナ燃焼能力をきめ細かく調整制御したりすることができるために、風呂バーナ装置６の燃焼に及ぼす影響を小さくすることができる。
【００９７】
さらに、風呂能力データ記憶部51に、給湯燃焼停止前の給湯運転条件パラメータとして、給湯の出湯量以外のパラメータに対応する風呂能力データを与え、このデータと給湯燃焼停止前の給湯運転条件パラメータとを風呂能力調整制御部50により照合し、給湯運転条件パラメータに応じた風呂能力データの燃焼能力でもってＱ機能待機中における風呂バーナ装置６の燃焼能力を制御させるようにしてもよい。
【００９８】
さらに、上記実施形態例では、いずれも設定待機時間の終点からその手前側に解除区間を設定し、給湯燃焼停止時から解除区間を差し引いた能力調整制御待機時間を求め、この時間内に再出湯が行われずに風呂バーナ装置６の燃焼が行われるときの風呂バーナ燃焼の制御を行うようにしたが、解除区間は必ずしも設定する必要はなく、給湯燃焼停止時から設定待機時間の終点までを能力調整制御状態（Ｑ機能待機状態）としてもよい。
【００９９】
さらに、上記実施形態例では、図６に示したシステム構成を有する複合給湯器を対象としたが、本発明の複合給湯器は、図７に示したような、給湯側と風呂側との別々の燃焼ファン８，９を有する複合給湯器としてもよい。このときにも風呂バーナ燃焼の調整制御に伴い、燃焼ファン９の回転が調整制御されると、燃焼ファン９の回転に連動して給湯バーナ装置５側の燃焼ファン８の回転も調整されることになり、上記実施形態例と同様の効果を奏する。
【０１００】
さらに、上記実施形態例では、器具内温度センサ53を給湯側のノズルホルダ12の側面側に設けたが、器具内温度センサ53は必ずしもノズルホルダ12の側面側に設けるとは限らず、器具内の温度が検出できる適宜の場所に配設すればよく、また、場合によっては、器具内温度センサ53を省略することもできる。
【０１０１】
さらに、上記実施形態例では、ガス供給通路36に、１つのガス比例弁38を設けたが、図９に示すように、ガス供給通路36を分岐させた分岐通路に、給湯側と風呂側にそれぞれガス比例弁38ａ，38ｂを介設してもよい。このように構成したときには、図１の鎖線に示すように、給湯側のガス比例弁38ａは給湯燃焼制御部43によって制御され、風呂側のガス比例弁38ｂは風呂燃焼制御部48によって制御されることになる。
【０１０２】
さらに、上記実施形態例では、ガスを燃料として燃焼運転を行う複合給湯器について述べたが、本発明の複合給湯器は、石油等の他の燃料を用いる複合給湯器にも適用されるものである。
【０１０３】
【発明の効果】
本発明によれば、再出湯湯温安定化可能時間として予め設定される給湯燃焼停止時から最長再出湯開始までの設定待機時間中に再出湯が行われずに風呂バーナの燃焼が行われるときには、風呂能力調整制御部により、給湯燃焼停止前の給湯運転条件パラメータや、風呂バーナの燃焼開始時の浴槽湯水の温度や、給湯燃焼停止前の動作モードの種類等の各パラメータに基づいて、風呂バーナの燃焼能力を制御させる構成としたために、設定待機時間中に風呂バーナ燃焼が行われたときに、再出湯湯温安定化制御と風呂バーナ燃焼のうち、どちらを優先させれば良いかを前記各パラメータに基づいて的確に判断決定し、風呂バーナの燃焼能力を制御させることにより、風呂バーナ燃焼と再出湯湯温安定化制御とのバランスをとり、使用者が快く使用することができる複合給湯器とすることが可能となる。そして、例えば、設定待機時間中は、常に風呂バーナの燃焼を最小燃焼能力での燃焼とする場合と異なり、追い焚き熱交換器の寿命を短くすることもなく、長期に渡って快適に使用できる寿命の長い複合給湯器を提供することができる。
【０１０４】
また、解除区間を設けた構成にあっては、給湯燃焼停止時から解除区間の開始までに風呂バーナの燃焼が行われないときには、解除区間内に風呂バーナの燃焼が開始されても風呂燃焼能力の調整制御を行わないので、例えば風呂燃焼能力の低下制御に起因する使い勝手が悪くなるという問題や、器具の耐久性の悪化の問題等を軽減させることができ、かつ、再出湯湯温の安定化を成すことができる。
【図面の簡単な説明】
【図１】本発明に係る複合給湯器の実施形態例の制御部要部構成を示すブロック図である。
【図２】本実施形態例の制御部に設けられる風呂能力データ記憶部に与えられる風呂能力データの一例を示すグラフである。
【図３】本発明に係る複合給湯器における解除区間設定例を示す説明図である。
【図４】上記実施形態例の動作の一例を示すフローチャートである。
【図５】上記実施形態例の動作の別の例を示すフローチャートである。
【図６】給湯バーナの排気ガスと風呂バーナの排気ガスとが共通の排気口から排出されるタイプの複合給湯器の一例を示すシステム構成図である。
【図７】給湯バーナの排気ガスと風呂バーナの排気ガスとが共通の排気口から排出されるタイプの複合給湯器の別の例を示すシステム構成図である。
【図８】給湯燃焼停止以降の給湯熱交換器内の残留湯温の時間的変化の説明図である。
【図９】本発明に係る複合給湯器の他の実施形態例の構成説明図である。
【符号の説明】
８，９燃焼ファン
42 排気口
43 給湯燃焼制御部
44 経過時間計測手段
45 能力調整停止部
48 風呂燃焼制御部
49 運転条件パラメータ記憶部
50 風呂能力調整制御部
51 風呂能力データ記憶部
53 器具内温度センサ
54 解除区間設定部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a composite water heater provided with a hot water supply burner and a function burner other than hot water supply.
[0002]
[Prior art]
FIG. 6 shows a system configuration of a conventional general combined water heater. In the figure, the appliance 1 is partitioned into a hot water supply combustion chamber 3 and a bath combustion chamber 4 as another functional combustion chamber via a partition 2, and the hot water supply combustion chamber 3 has hot water supply as a hot water supply burner. A burner device 5 is provided, and the bath combustion chamber 4 is provided with a bath burner device 6 as a bath burner.
[0003]
The hot water supply burner device 5 and the bath burner device 6 are juxtaposed with each other through the partition part 2, and gas nozzle holders 12 and 13 are arranged on the gas inlet sides of the burner devices 5 and 6 with the gas nozzles facing each other. The gas supply passage 36 communicating with the gas nozzle holders 12 and 13 is provided with an original solenoid valve 37 and a gas proportional valve 38. The gas supply passage 36 on the downstream side of the gas proportional valve 38 is branched to control hot water supply capacity. Gas is guided to the valve 39 and the bath capacity control valve 40. A lower side of the hot water supply burner device 5 and the bath burner device 6 is a common air chamber (air chamber) 7, and a combustion fan 8 for supplying and exhausting air is connected to the bottom surface side of the air chamber 7.
[0004]
In the hot water combustion chamber 3, a hot water supply heat exchanger 15 is installed above the hot water supply burner device 5, and the hot water supply heat exchanger 15 is introduced from a water supply source such as water supply via a water supply passage 19. The hot water is heated by the combustion flame of the hot water supply burner device 5 to produce hot water of a set temperature, and this hot water is desired in a kitchen, bathroom, etc. via the hot water supply passage 20 connected to the outlet side of the hot water heat exchanger 15. The hot water is led to the hot water supply location. A flow rate sensor 41 is interposed in the water supply passage 19 so that the flow rate of water supplied from the water supply source to the water heater is detected. In the figure, reference numeral 30 denotes an incoming water temperature sensor, and 31 denotes a hot water temperature sensor, and these sensors detect the incoming water temperature to the hot water supply heat exchanger 15 and the outgoing hot water temperature from the hot water supply heat exchanger 15, respectively. .
[0005]
In the bath combustion chamber 4, a reheating heat exchanger 16 is installed on the upper side of the bath burner device 6, and one end side of a pipeline 22 is connected to the inlet side of the reheating heat exchanger 16, The other end side of the path 22 is connected to the discharge side of the circulation pump 23. This pipe line 22 is provided with a bath temperature sensor 24 such as a thermistor for detecting the temperature of water flow.
[0006]
The return pipe 26 of the recirculation circuit 25 is connected to the suction side of the circulation pump 23, and the return port side (inlet side) of the return pipe 26, which is a circulation port, is connected to the side wall of the bathtub 21 via a circulation fitting 27. It is connected. The return pipe 26 is provided with a reheating water flow switch 28 as a water flow detection sensor that detects water flow and outputs an ON signal. The exit side of the recirculation circuit 25 is connected to the outlet side of the reheating heat exchanger 16 and the outlet side of the recirculation circuit 25 is connected to the side wall of the bathtub 21 via the circulation fitting 27. . The reheating heat exchanger 16 recirculates the bath by introducing the circulating hot water from the bathtub and heating it with the combustion flame of the bath burner device 6, and returning the heated hot water to the bathtub 21. Both the bath combustion chamber 4 and the hot water supply combustion chamber 3 communicate with a common exhaust port 42, and the exhaust gas of the hot water burner device 5 and the exhaust gas of the bath burner device 6 are discharged from the common exhaust port 42. It has become so.
[0007]
A hot water filling pipe 32 is branched into the hot water supply passage 20 and is connected to a pipe 22. The hot water filling pipe 32 detects a hot water filling valve 35 as a hot water pouring control valve and a bathtub water level. A pressure sensor 34 is provided as a water level detection sensor.
[0008]
This type of composite water heater is provided with a control device 56 that controls hot water burner combustion, bath burner combustion, and the like, and a remote controller 55 is connected to the control device 56. Signals from various sensors such as the flow rate sensor 41 are applied to the control device 56. For example, a hot water tap provided in a hot water supply place such as a kitchen to which the hot water supply passage 20 is guided (for example, (Not shown) is opened, and when water is introduced into the water supply passage 19 from a water supply source such as a water supply, the control device 56 rotates the combustion fan 8 when receiving a water incoming signal from the flow sensor 41 to supply gas. Former solenoid valve of passage 36 37 The gas proportional valve 38 and the hot water supply capacity control valve 39 are opened, the hot water supply burner device 5 is ignited in that state, and the hot water temperature detected by the hot water temperature sensor 31 is set by the remote controller 55 after the flame is detected. The hot water supply operation in the hot water supply mode is controlled so that the set temperature is reached.
[0009]
When controlling the hot water supply operation, the control device 56 is given in advance a combustion heat quantity at the time of minimum combustion (minimum combustion heat quantity) and a combustion heat quantity at the time of maximum combustion (maximum combustion heat quantity). The device 56 supplies the amount of gas supplied from the gas supply passage 36 to the hot water supply burner device 5 and the hot water supply burner device 5 from the combustion fan 8 so that the hot water supply burner combustion is performed within the range from the minimum combustion heat amount to the maximum combustion heat amount. With these controls, hot water having a stable set temperature is supplied from the hot water supply heat exchanger 15 through the hot water supply passage 20 to a desired hot water supply place.
[0010]
The control device 56 opens the pouring valve 35 such as a solenoid valve, replenishes hot water produced on the hot water supply heat exchanger 15 side, drops it into the bathtub 21 via the circulation path 25, and fills the hot water. It has a mode operation function. This automatic hot water filling operation is performed by a command from the remote controller 55 or the like, and when the hot water level reaches the set water level set by the remote controller 55 etc. by the pressure sensor 34, the hot water filling valve 35 is closed and the hot water filling is stopped. Then, the circulation pump 23 is started and the operation in the reheating mode is performed.
[0011]
In this reheating operation, the control device 56 first rotates the circulation pump 23 in the recirculation circuit 25 to circulate hot water in the bathtub 21 through the recirculation circuit 25. When the reheating water switch 28 detects the flow of hot water, the control device 56 rotates the combustion fan 8, opens the solenoid valve, and burns the bath burner device 6 by spot ignition to reheat the heat exchanger 16. The circulating hot water passing through is heated to recharge the hot water in the bathtub 21.
[0012]
In this chasing operation control, the control device 56 is usually given a value of the maximum combustion heat amount, and the combustion fan 8 is rotated at a fan rotational speed corresponding to the maximum combustion heat amount, so that the bath burner device is provided. 6 Burner combustion is performed so that the reheating is performed as soon as possible. When the bath temperature detected by the bath temperature sensor 24 reaches the bath set temperature set by the remote controller 55, the chasing operation is stopped.
[0013]
In this type of combined water heater, the heat transfer mode is shifted from the end of the reheating operation to a predetermined time (for example, 4 hours), and the circulation pump 23 is activated at a time interval of, for example, 30 minutes. The bath hot water is circulated through the circulation path 25, and when the bath hot water temperature detected by the bath temperature sensor 24 falls below a predetermined temperature with respect to the bath set temperature, the bath burner device 6 is burned. The bath water is kept warm by performing an operation such as raising the temperature of the bath water to the set temperature. In this warming operation, in the case of a bath apparatus having a water level maintaining function, the bath water level is always monitored by the water level detection signal of the pressure sensor 34 during the warming mode, and the bath water level is within the allowable range from the set water level. When the temperature drops below the upper limit, the hot water supply valve 35 is opened, and the amount of water that is insufficient up to the set water level is added from the hot water supply heat exchanger 15 side, and the operation in the water retention mode is performed to keep the bathtub water level at the set water level.
[0014]
As shown in FIG. 7, the conventional composite water heater includes a combustion fan 8 for supplying and exhausting hot water burner combustion of the hot water supply burner device 5 and a combustion fan 9 for supplying and exhausting bath burner combustion of the bath burner device 6. Are provided separately and provided with individual combustion chambers 7a and 7b. Also in the compound water heater shown in the figure, 6 Similarly to the composite water heater shown in FIG. 1, the hot water combustion chamber 3 and the bath combustion chamber 4 communicate with a common exhaust port 42. Also in this type of composite water heater, the exhaust gas and the bath burner of the hot water burner device 5 are used. The exhaust gas of the apparatus 6 is discharged from a common exhaust port 42.
[0015]
In this type of combined water heater, when only the bath burner combustion by the bath burner device 6 is performed, not only the combustion fan 9 is rotated, but rotation control of both the combustion fans 9 and 8 is performed. This is because, in a composite water heater of the type in which the exhaust gas of the hot water burner device 5 and the exhaust gas of the bath burner device 6 are discharged from a common exhaust port 42, as in the composite water heater shown in FIG. If the combustion fan 8 on the hot water supply burner device 5 side is not rotated during the combustion of the bath burner device 6, the exhaust gas of the bath burner device 6 performing combustion with the maximum combustion capacity corresponding to the maximum amount of combustion heat flows to the hot water supply side. It is extremely dangerous if the exhaust gas flows backward and the exhaust gas leaks. In order to avoid the danger, both the combustion fans 8 and 9 need to be rotated. Note that the rotation speed of the combustion fan 8 at this time is controlled to rotate at a large rotation speed corresponding to the rotation speed of the combustion fan 9.
[0016]
[Problems to be solved by the invention]
Incidentally, the characteristic line a in FIG. 8 shows a change in the remaining hot water temperature of hot water remaining in the hot water supply heat exchanger 15 after the end of the previous hot water supply combustion in the combustion apparatus such as the above-described combined hot water heater. As is clear from this figure, after the hot water combustion is stopped, the heat etc. retained in the main body of the hot water heat exchanger 15 and the fins 47 are gradually propagated to the hot water remaining in the hot water heat exchanger 15, The hot water temperature gradually rises above the set temperature (this phenomenon is referred to as post-boiling), and thereafter, the hot water temperature is gradually naturally cooled and decreases with time.
[0017]
Therefore, the post-boiling time t when the hot water temperature in the hot water supply heat exchanger 15 becomes higher than the set temperature. _A If re-bathing is performed inside, hot water with overshoot higher than the set temperature is discharged, and after-boiling time t _A If re-bathing is performed after a while, the undershoot hot water that is considerably warmer than the set temperature is poured out, and the user feels uncomfortable.
[0018]
Therefore, the present applicant obtains the combustion heat quantity at the time of hot water supply combustion stop determined from the combustion condition parameters such as the incoming water temperature, the hot water temperature, and the hot water flow rate before stopping the hot water combustion operation, and from this combustion heat quantity in the hot water supply heat exchanger 15 Proposed (unpublished) a function (hereinafter referred to as Q function) that estimates and detects the temperature characteristics of residual hot water through experiments and calculations, and stabilizes the temperature of hot water again based on the estimated and detected data. .
[0019]
This control is performed during a set standby time from the hot water combustion stop time to the longest re-hot water start, which is preset as a re-heated hot water temperature stabilization possible time based on the estimated temperature data. In order to compensate for the hot water temperature drop Δk based on the estimated temperature data earlier, the startup gas amount is increased and the Q function is performed.
[0020]
However, in the complex water heater as shown in FIGS. 6 and 7, when the bath burner device 6 is combusted, a combustion fan that is always provided on the hot water burner device 5 side (common in the device of FIG. 6). (Combustion fan) 8 is also rotated at a large fan rotational speed corresponding to the combustion of the bath burner device 6. For example, when the hot water supply burner device 5 is composed of a burner device having a small amount of stored heat, combustion is performed. The hot water supply burner device 5 is immediately cooled by the air supplied to the hot water supply burner device 5 side by the rotation of the fan 8, and then the hot water supply heat exchanger 15 is cooled by the supply air from the combustion fan 8. . Therefore, for example, as shown by the characteristic line b in FIG. 8, the rate of decrease in the remaining hot water temperature in the hot water supply heat exchanger 15 is large, and the residual hot water temperature in the hot water supply heat exchanger 15 is different from the estimated temperature data. For this reason, the Q function is not achieved, and it becomes impossible to stabilize the hot water temperature.
[0021]
Further, when the hot water supply burner device 5 is constituted by a burner device having a large stored heat amount, when the combustion fan 8 is rotated, the stored heat amount of the hot water supply burner device 5 is added to the hot water supply heat exchanger 15 side, for example, as shown in FIG. As shown in the characteristic line c, the after boiling increases, the residual hot water temperature differs from the estimated temperature data, the Q function is not achieved at this time, and the user of the water heater feels uncomfortable. turn into.
[0022]
Therefore, in order to minimize the degree of decrease or increase in the remaining hot water temperature in the hot water supply heat exchanger 15 caused by the rotation of the combustion fan 8 accompanying the bath burner combustion, for example, during the set waiting time, When the burner combustion is performed, it is conceivable that the bath burner device 6 is burned with a combustion capacity as small as possible so that the rotational speed of the combustion fan 8 is small. When it is burned with the capacity, it takes a very long time for the bath to boil, resulting in a problem that the usability of the composite water heater becomes worse.
[0023]
In addition, when the bath burner device 6 is burned for a long time with a small combustion capacity, the combustion with the small amount of air supplied from the combustion fan 8 (or 9) continues for a long time, so that the reheating heat exchanger 16 or the like Condensation is likely to occur, and the condensation is caused by nitrogen compounds (NO) in the exhaust gas. _x ) And sulfur compounds (SO _x ), Etc., and become water droplets of a strongly acidic aqueous solution called drain, which adheres to the reheating heat exchanger 16 etc., which causes corrosion of the reheating heat exchanger 16 etc., resulting in a problem of shortening the service life. .
[0024]
The present invention has been made in order to solve the above-mentioned problems, and the object thereof is to balance the reheated water temperature stabilization control on the hot water supply side and the bath burner combustion, and the user can use it with ease. An object of the present invention is to provide a composite water heater that can be used.
[0025]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides means for solving the problems by the following configuration. In other words, the first invention is a hot water supply burner that performs heating and combustion of a hot water supply heat exchanger, a bath burner that performs heating and combustion of a reheating heat exchanger, and common supply and exhaust of the hot water supply burner combustion and bath burner combustion. Or a separate combustion fan, and the exhaust gas from the hot water burner and the exhaust gas from the bath burner are discharged from a common exhaust port. In the case where a combustion fan for separately supplying and exhausting the hot water burner combustion and the bath burner combustion is provided, the combustion fan for supplying and exhausting the hot water burner combustion and the supply and exhaust of the bath burner combustion are performed at the time of the bath burner combustion Rotate both combustion fans with the combustion fan In the type of combined water heater, the burner burns when the burner burns during the set waiting time from the hot water combustion stop time to the start of the longest hot water discharge, which is set in advance as the reheated hot water temperature stabilization possible time A bath capacity data storage unit in which capacity data is given as bath capacity data according to the hot water supply operation condition parameter before stopping hot water combustion, and an elapsed time that measures the passage of time from hot water combustion stop to re-draining Measuring means, an operating condition parameter storage unit for storing hot water supply operating condition parameters before stopping hot water combustion, and hot water stored in the operating condition parameter storage unit when the bath burner is burned during the set standby time The hot water operation condition parameter before stopping the combustion is compared with the data stored in the bath capacity data storage unit, and the hot water operation condition parameter before stopping the hot water combustion. It is configured as characterized by having a bath capacity adjustment control unit for controlling the combustion capability of the bath burner during set waiting time with the combustion capability of the bath capacity data according to the meter.
[0026]
Also, The second invention comprises the configuration of the first invention, The hot water operation condition parameter is given by the amount of hot water discharged, and the bath capacity data storage section is divided into a case where the amount of hot water is greater than or equal to the reference set amount of hot water and a case where the amount of discharged hot water is less than the reference set amount of hot water. The minimum combustion capacity data is given for the range exceeding the tapping amount, and the maximum combustion capacity data is given for the range where the tapping amount is less than the standard tapping amount. It is characterized by. Further, the third invention is provided with the configuration of the first invention. The hot water operation condition parameter is given by the amount of hot water discharged, and the bath capacity data storage unit is provided with bath capacity data in which the decrease in combustion capacity is increased continuously or stepwise in proportion to the increase in the amount of hot water. What is being done Features The
[0027]
In addition, this book 4 The invention includes a hot water supply burner that performs heating and combustion of a hot water supply heat exchanger, a bath burner that performs heating and combustion of a reheating heat exchanger that is incorporated in a reheating circulation path that circulates bathtub hot water, and a reheating circulation path. A bath temperature sensor for detecting the temperature of the circulating hot water and a common or individual combustion fan for supplying and exhausting the hot water burner combustion and the bath burner combustion, and the exhaust gas of the hot water burner and the exhaust gas of the bath burner are common Exhausted from In the case where a combustion fan for separately supplying and exhausting the hot water burner combustion and the bath burner combustion is provided, the combustion fan for supplying and exhausting the hot water burner combustion and the supply and exhaust of the bath burner combustion are performed at the time of the bath burner combustion Rotate both combustion fans with the combustion fan In the type of combined water heater, the burner burns when the burner burns during the set waiting time from the hot water combustion stop time to the start of the longest hot water discharge, which is set in advance as the reheated hot water temperature stabilization possible time The bath capacity data storage unit in which the temperature data is given as a parameter of the bath hot water temperature as the bath capacity data, the elapsed time measuring means for measuring the passage of time from the hot water combustion stop to the re-watering, The bath temperature data detected by the bath temperature sensor when the bath hot water is recirculated during the set waiting time and the bath burner is burned is taken in, and the bath capacity data corresponding to this circulating hot water detection temperature is stored in the bath. Combustion capacity of the bath burner during the set waiting time with the combustion capacity of the obtained bath capacity data. It is configured as characterized by having a bath capacity adjustment control unit for controlling.
[0028]
Also, The fifth invention comprises the configuration of the fourth invention, The bath capacity data storage section is divided into a case where the temperature of the bathtub hot water is equal to or higher than the reference set temperature and a case where the temperature of the bath hot water is lower than the reference set temperature. However, the maximum combustion capacity data must be given for each range below the reference set temperature. It is characterized by. Furthermore, the sixth invention is provided with the configuration of the fourth invention. The bath capacity data storage unit is provided with bath capacity data in which the decrease amount of the combustion capacity is increased continuously or stepwise in proportion to the increase in the temperature of the bath water. Features The
[0029]
In addition, this book 7 The invention includes a hot water supply burner that performs heating and combustion of a hot water supply heat exchanger, a bath burner that performs heating and combustion of a reheating heat exchanger that is incorporated in a reheating circulation path that circulates bathtub hot water, and a hot water heat exchanger. A pouring passage that communicates the hot water supply passage on the outlet side and the recirculation circuit via a pouring control valve, and a common or individual combustion fan that supplies and discharges the hot water burner combustion and the bath burner combustion, The exhaust gas from the hot water burner and the exhaust gas from the bath burner are discharged from a common exhaust port. In the case where a combustion fan for separately supplying and exhausting the hot water burner combustion and the bath burner combustion is provided, the combustion fan for supplying and exhausting the hot water burner combustion and the supply and exhaust of the bath burner combustion are performed at the time of the bath burner combustion Rotate both combustion fans with the combustion fan Type hot water supply with a hot water filling mode that opens the pouring control valve and a water retention mode function that keeps the bathtub water level at a set water level, and a hot water temperature that is set in advance as a temperature that can be stabilized again. A bath capacity data storage unit is provided in which the data of the combustion capacity of the bath burner is given as bath capacity data when the burn of the bath burner is performed during the set waiting time from when combustion stops until the start of the longest re-watering. The data storage unit contains data on the maximum combustion capacity when the operation before stopping the combustion of the hot water supply burner is in the filling mode with the pouring control valve opened, and the minimum combustion capacity when operating in the water retention mode. Data is provided for each of them, and an elapsed time measuring means for measuring the elapsed time from the hot water combustion stop to the re-heating, and the hot water filling mode operation by hot water combustion or When the operation in the water mode is performed, the operation condition parameter storage unit that stores information on the operation mode at least during the hot water combustion after the hot water combustion is stopped, and when the bath burner is burned during the set waiting time The hot water operation mode information before stopping the hot water combustion stored in the operating condition parameter storage unit is read out and collated with the data in the bath capacity parameter storage unit, and according to the hot water operation mode information before the hot water combustion stop. And a bath capacity adjustment control unit that controls the combustion capacity of the bath burner during the set standby time with the combustion capacity.
[0030]
further, An eighth invention comprises the structure of any one of the first to seventh inventions, A release section is set on the near side from the end point of the set standby time from the hot water combustion stop to the start of re-heating, and there is no use of a bath burner within the time from the start of the set standby time to the start of the release section A capacity adjustment stop unit is provided to stop the function of the bath capacity adjustment control unit during the combustion of the bath burner during the hot water supply combustion stop after that is detected Features The
[0031]
further, A ninth invention comprises the configuration of the eighth invention, An in-appliance temperature sensor for detecting the in-appliance temperature is provided, and when the in-appliance detection temperature detected by the in-appliance temperature sensor is lower than the pre-applied reference temperature, the temperature is continuously changed according to the amount of temperature decrease. A cancellation interval setting unit is provided that corrects in a direction to reduce the duration of the cancellation interval in a stepwise manner. It is characterized by. Further, a tenth aspect of the invention includes the configuration of the eighth aspect of the invention. In-appliance temperature sensor for detecting the in-appliance temperature, a memory in which data of a release section that varies depending on the in-appliance temperature is provided corresponding to the in-appliance temperature, and in-appliance detection detected by the in-appliance temperature sensor It is also a characteristic configuration of the present invention that a release section setting unit that takes in the temperature and sets a release section corresponding to the temperature detected in the appliance from the data stored in the memory is provided.
[0032]
In the first invention of the above configuration, the bath capacity data storage unit stores the bath burner during the set waiting time from the hot water combustion stop time to the longest hot water start time set in advance as the re-heated water temperature stabilization possible time. The combustion capacity data of the bath burner when combustion is performed is given as the bath capacity data according to the parameters of the hot water supply operation conditions before the hot water supply combustion stop, so that re-bathing is not started during the set waiting time. When the bath burner is burned, the bath capacity adjustment control unit compares the hot water operating condition parameters before stopping hot water combustion with the data stored in the bath capacity data storage unit, and hot water before stopping hot water combustion. The combustion capability of the bath burner is controlled by the combustion capability of the bath capability data corresponding to the operating condition parameter.
[0033]
Therefore, when the hot water supply operating condition parameter is given by the amount of hot water discharged, for example, when the amount of hot water is in a range equal to or larger than the reference set amount of hot water given to the bath capacity data storage unit, the bath burner combustion is performed with the minimum combustion capacity. If the amount of hot water discharged is less than the standard set hot water amount, bath burner combustion is controlled with the maximum combustion capacity, or the amount of hot water discharged from the hot water supply is increased in the bath capacity data storage unit. Bath burner combustion is controlled in accordance with bath capacity data in which the amount of decrease in combustion capacity is increased continuously or stepwise in proportion.
[0034]
In addition, this configuration of the above configuration 4 In the invention, when the bath burner is burned in the bath capacity data storage unit during the set standby time from the hot water combustion stop time to the longest hot water start time set in advance as the re-heated water temperature stabilization possible time The bath burner combustion capacity data is given as the bath capacity data as a parameter of the bath hot water temperature, and the bath hot water is recirculated without being re-drained during the set waiting time, and the bath burner is burned. Is performed, the combustion capacity control of the bath burner is performed by the bath capacity adjustment control unit based on the circulating hot water detection temperature detected by the bath temperature sensor.
[0035]
Therefore, for example, when the circulating hot water detection temperature is equal to or higher than the reference set temperature given to the bath capacity data storage unit, the bath burner combustion is performed with the minimum combustion capacity, and the circulating hot water detection temperature is less than the reference set temperature. If it is within the range, the burner combustion control is performed with the maximum combustion capacity, or the decrease in the combustion capacity is continuously increased in proportion to the increase in the temperature of the bath water given to the bath capacity data storage unit or Based on the bath capacity data increased stepwise, bath burner combustion capacity control corresponding to the circulating hot water detection temperature is performed.
[0036]
Furthermore, the book of the above configuration 7 In the invention, when the bath burner is burned in the bath capacity data storage unit during the set standby time from the hot water combustion stop time to the longest hot water start time set in advance as the re-heated water temperature stabilization possible time The burn capacity data of the hot water burner is given as bath capacity data, corresponding to whether the hot water burner operation before the combustion stop is hot water filling mode or water retention mode, and during the set waiting time When the bath burner is burned without re-bathing, the bath capacity adjustment control unit sets the waiting time with the maximum combustion capacity in the hot water filling mode according to the hot water operation mode information before stopping hot water combustion. The combustion capacity control of the bath burner is performed, and the combustion capacity control of the bath burner is performed with the minimum combustion capacity in the water retention mode.
[0037]
As described above, in the present invention, the combustion capacity data of the bath burner when the bath burner combustion is performed during the set waiting time is performed, for example, during the operating condition parameter before the hot water supply combustion stop or during the set waiting time. Based on the bath water temperature at the time of bath burner combustion, etc., it is given to the bath capacity data storage unit as control data for balancing the bath burner combustion and re-exposed water temperature stabilization control, and the bath is selected according to this control data. Since the burner combustion capacity adjustment is performed, the balance between the bath burner combustion during the set waiting time and the hot water temperature stabilization control is achieved, and the above problem is solved.
[0038]
In addition, when the reheating of the bath burner as described above is being performed, the reburning operation of the bath burner returns to the normal operation, and the bath in the combustion capacity adjustment control state If the elapsed time from the hot water supply combustion stop is exceeded during the burner combustion and the hot water combustion has stopped, the remaining hot water in the hot water heat exchanger cools down and a cold start occurs. There is no need to continue the operation of stabilizing the hot water temperature, the bath combustion capacity adjustment control operation is stopped, and the combustion operation of the bath burner returns to the normal operation.
[0039]
Further, in the case where the release section is set on the near side from the end point of the set standby time from the hot water combustion stop to the start of re-heating, within the time from the start of the set standby time to the start of the release section When it is detected that the bath burner is not used, the capability adjustment stop unit stops the function of the bath capability adjustment control unit during combustion of the bath burner during the hot water supply combustion stop after the start of the release section.
[0040]
In addition, an in-appliance temperature sensor for detecting the in-appliance temperature is provided, and the release width is corrected by setting the in-appliance detection temperature detected by the in-appliance temperature sensor or the release section is set. In the case where the section setting unit is provided, the release section is adjusted according to the temperature detected by the in-appliance temperature sensor.
[0041]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. In the description of the present embodiment, the same reference numerals are assigned to the same name portions as in the conventional example, and the duplicate description thereof is omitted. The composite water heater of the present embodiment is directed to the composite water heater having the system configuration shown in FIG. 6R> 6. The feature of the present embodiment that is different from the conventional example is that the temperature of the reheated hot water is stabilized. And a special circuit that controls the ability of the burner to burn when the burner is burned during the set standby time given as the time that can be stabilized for the re-draining water temperature. It is. In this embodiment, as indicated by the broken lines in FIGS. Hot water supply An in-appliance temperature sensor 53 is provided on the side surface side of the gas nozzle holder 12 on the burner device 5 side to detect the temperature in the apparatus.
[0042]
FIG. 1 shows a specific circuit configuration (configuration of the control device 56) of the present embodiment described below. As shown in FIG. 1, this circuit includes a hot water supply combustion control unit 43, bath combustion. It consists of a control unit 48, an elapsed time measuring means 44, an operating condition parameter storage unit 49, a bath capacity data storage unit 51, a capacity adjustment stop unit 45, a memory 46, and a bath capacity adjustment control unit 50. Accordingly, a release section setting unit 54 is provided.
[0043]
As in the conventional example, the hot water combustion control unit 43 controls the hot water combustion operation in each mode such as the hot water supply mode, the hot water filling mode, and the water retention mode, and the details of each control are the same as in the conventional example. The description is omitted. The hot water combustion control unit 43 of the present embodiment measures the elapsed time of the hot water combustion stop signal when the hot water tap of the kitchen or the like is closed and the flow sensor 41 detects the stop of the water flow and outputs a flow stop signal. When the hot water tap is opened and the flow rate sensor 41 detects the flowing water and outputs a flowing water signal, a hot water combustion start signal is output. Further, when the hot water supply combustion is stopped, the hot water supply operation condition parameter before the hot water supply combustion stop is added to the operation condition parameter storage unit 49.
[0044]
The operation condition parameter storage section 49 stores hot water supply operation condition parameters such as the amount of hot water discharged from the hot water supply before the stop of the combustion operation, which is applied from the hot water supply combustion control section 43.
[0045]
The elapsed time measuring means 44 is configured to have a timer (hereinafter referred to as a Q timer). Upon receiving a hot water combustion stop signal from the hot water combustion control unit 43, combustion of the hot water burner device 5 stops, Then, the Q timer is driven by the timer and a re-hot water standby start signal is output to the bath capacity adjustment control unit 50 and the capacity adjustment stop unit 45. When the hot water tap is opened and the hot water supply combustion control unit 43 outputs a hot water combustion start signal in the Q timer driving state, it is determined that the hot water start is started, the Q timer is stopped, and the hot water start signal is adjusted at the same time. It outputs to the stop part 45 and resets the Q timer in preparation for the next re-watering waiting time measurement.
[0046]
In the bath capacity data storage unit 51, the data of the combustion capacity of the bath burner apparatus 6 when the bath burner apparatus 6 is combusted without performing re-bathing during the set waiting time is used as bath capacity data. When the circulating pump 23 is driven by recirculating circulation of bathtub hot water, the temperature of the bathtub circulating hot water detected by the bath temperature sensor 24 is equal to or higher than a preset reference temperature. 2 and when the temperature is lower than the reference set temperature, as shown in FIG. 2A, the minimum combustion capacity data is in the range where the bath water temperature is higher than the reference set temperature A and the temperature is less than the reference set temperature. Each is given data on maximum combustion capacity.
[0047]
The bath capacity adjustment control unit 50 detects the circulating hot water detection temperature (bath water temperature detected by the bath temperature sensor 24 when the bath hot water is recirculated during the Q function standby and the bath burner device 6 is combusted. ), The bath capacity data corresponding to the circulating hot water detection temperature is obtained from the data in the bath capacity data storage unit 51, and the combustion capacity of the bath burner device 6 during the set standby time with the combustion capacity of the obtained bath capacity data Is controlled by the bath combustion control section 48. When the bath capacity adjustment control unit 50 receives the re-hot water standby start signal from the elapsed time measuring means 44 indicating that the hot water combustion has stopped, the bath capacity adjustment control section 50 enters the capacity adjustment control standby state, and in this state, the frame rod electrode on the bath burner device 6 side. When a flame is detected (not shown), it is determined that combustion of the bath burner device 6 has been performed, and the following capacity adjustment control command operation is started.
[0048]
Even when the combustion of the bath burner device 6 continues from before the hot water supply combustion stop to after the hot water supply combustion stop, the following capacity adjustment control command operation is started at the hot water supply combustion stop, and the hot water is discharged again from the stop of the hot water supply combustion. When the start / stop of combustion of the bath burner device 6 is repeated many times during the start or until the set standby time, the following capacity adjustment control command operation is performed every time the combustion of the bath burner device 6 is started.
[0049]
The bath capacity adjustment control unit 50 receives the value of the circulating hot water detection temperature detected by the bath temperature sensor 24, and when this circulating hot water detection temperature is lower than the reference set temperature A shown in FIG. A maximum combustion command is applied to the bath combustion control unit 48, and the opening amount of the gas proportional valve 38 and the rotational speed of the combustion fan 8 are controlled by the bath combustion control unit 48, so that the combustion capability of the bath burner device 6 is maximized. Let me control. When the circulating hot water detection temperature is equal to or higher than the reference set temperature A, a minimum combustion command is applied to the bath combustion control unit 48, and the bath burner device is controlled by controlling the valve opening amount of the gas proportional valve 38, the rotational speed of the combustion fan 8, and the like. 6 is controlled to burn with the minimum combustion capacity. Further, in order to prevent hunting when the circulating hot water detection temperature (bath return hot water temperature) is in the vicinity of the reference set temperature A, a hysteresis may be provided as shown by a broken line in FIG.
[0050]
The circulating hot / cold water detection temperature detected by the bath temperature sensor 24 may be taken in indirectly from the bath combustion control unit 48, or may be taken in directly from the bath temperature sensor 24 as shown by the chain line in FIG. Good.
[0051]
In the memory 46, for example, as shown in FIG. 3, a set standby time T as a stabilization time of the re-watering hot water temperature. _R (For example, 510 seconds) and the set waiting time T _R Release section T provided on the near side from the end point of _S (For example, 90 seconds) is given in advance.
[0052]
When the capacity adjustment stop unit 45 receives a re-hot water standby start signal from the elapsed time measuring means 44 indicating the hot water combustion stop, the measurement time of the Q timer of the elapsed time measuring means 44 (elapsed time from when the hot water combustion stopped) T _Q Sampling, and the set waiting time T from the memory 46 _R (For example, 510 seconds) and release interval T _S (For example, 90 seconds) _R To T _S The ability adjustment control standby time (for example, 420 seconds) is calculated by subtracting.
[0053]
The capacity adjustment stop unit 45 is a time T that has elapsed since the hot water supply combustion stopped. _Q When it is detected that the combustion of the bath burner device 6 has not been performed until the capacity adjustment control standby time indicating that it has entered the release section has been exceeded, the combustion of the bath burner apparatus 6 is performed within the release section. Even if the combustion fan 8 is started to rotate, the cooling acceleration phenomenon (set standby time T _R In the vicinity of the end point of the hot water burner device 5, the degree of the acceleration of cooling is caused by the rotation of the combustion fan 8, regardless of the amount of heat held by the hot water burner device 5. Therefore, it is determined that the temperature of the re-watering hot water can be stabilized, and a release signal for releasing the capacity adjustment control standby state is output to the bath capacity adjustment control unit 50. The bath capacity adjustment control unit 50 receives the cancel signal, cancels the capacity adjustment control standby state, and the capacity adjustment control command operation is not performed even if the start of combustion of the bath burner device 6 is detected thereafter.
[0054]
In addition, the capacity adjustment stop unit 45 is in a state where the adjustment control of the bath combustion capacity has been started / continued before the release section during the hot water combustion stop, and the elapsed time since the hot water combustion stop was not started without the start of re-heating. Time T _Q Is the set waiting time T, which is the time that can stabilize the temperature of re-draining hot water _R When the temperature exceeds the limit, the remaining hot water in the hot water heat exchanger 15 will be cooled down and a cold start will occur, so it is determined that there is no need to continue the stabilization of the re-exposed hot water temperature by adjusting the bath combustion capacity. A stop signal for stopping the adjustment control is output to the bath capacity adjustment control unit 45.
[0055]
Upon receiving the stop signal, the bath capacity adjustment control unit 50 outputs the capacity adjustment control stop signal to the bath combustion control unit 48.
[0056]
In addition, the capacity adjustment stop unit 45 outputs a stop signal for stopping the capacity adjustment control to the bath capacity adjustment control section 50 when receiving a re-hot water start signal indicating the start of hot water combustion from the elapsed time measuring means 44, and adjusts the bath capacity adjustment. When the controller 50 is in the capacity adjustment control standby state (waiting for the Q function), the controller 50 cancels the state, and outputs the capacity adjustment control stop signal to the bath combustion controller 48 when the bath combustion capacity adjustment control is in progress.
[0057]
The bath combustion control unit 48 receives the maximum or minimum combustion control command applied from the bath capacity adjustment control unit 50, and in the capacity adjustment control standby state, that is, during the Q function standby, the circulation detected by the bath temperature sensor 24 Combustion capacity control of the bath burner device 6 according to the hot water detection temperature is performed, and when not in Q function standby (including when a bath capacity adjustment stop signal is received from the bath capacity adjustment control unit 45), as in the conventional example The bath burner device 6 controls bath combustion.
[0058]
The present embodiment is configured as described above, and in the present embodiment as well, the hot water supply combustion control unit 43 and the bath combustion control unit 48 respectively provide a hot water supply mode, a hot water filling mode, and a reheating mode, respectively. In addition, since the operation control in each mode such as the heat retention mode is performed, and in the present embodiment example, since the hot water is provided with the Q function, As described above, re-heated hot water temperature stabilization control is performed based on estimated temperature data estimated and detected from the amount of combustion heat before stopping hot water supply combustion operation. In the present embodiment, when the bath burner device 6 is combusted during the Q function standby, the bath capacity is made corresponding to the circulating hot water detection temperature (bath return hot water temperature) detected by the bath temperature sensor 24. The adjustment control unit 50 adds the maximum combustion command or the minimum combustion command to the bath combustion control unit 48, and the bath combustion control unit 48 controls the combustion capability of the bath burner device 6.
[0059]
FIG. 4 specifically shows the operation of this embodiment when the combustion of the bath burner device 6 is performed during the Q function standby by the flowchart. As shown in the figure, when a hot water tap (not shown) such as a kitchen is closed in step 101 and the stop of the water flow is detected by the flow sensor 41 and a hot water stop signal is output, in step 102 The Q timer of the elapsed time measuring means 44 is turned on, and the elapsed time T from the start of driving of the Q timer _Q Is measured and added to the capacity adjustment stop unit 45 and the bath capacity adjustment control unit 50.
[0060]
Then, the bath capacity adjustment control unit 50 causes the elapsed time T _Q Is a preset waiting time T given to the memory 46 in advance. _R And release section T _S When the bath burner device 6 is combusted as shown in step 103 without performing re-draining during this capacity adjustment control standby time, as shown in step 103, in step 104, The bath capacity adjustment control unit 50 compares the circulating hot water detection temperature detected by the bath temperature sensor 24 with the reference set temperature A, and when the circulating hot water detection temperature is equal to or higher than the reference set temperature A, the bath combustion is performed in step 106. The minimum combustion command is added to the bath combustion control unit 48 so that the number of the number is reduced and the bath burner combustion is performed with the minimum combustion capacity, and the bath combustion control unit 48 performs the burner combustion control with the minimum combustion capacity.
[0061]
On the other hand, when it is determined in step 104 that the circulating hot water detection temperature is lower than the reference set temperature A, the bath capacity adjustment control unit 50 increases the bath combustion number in step 105 to increase the maximum burn capacity. A maximum combustion command is added to the bath combustion control unit 48 so as to perform combustion, and the bath combustion control unit 48 performs bath burner combustion control at the maximum combustion capacity.
[0062]
In step 107, the hot water is re-drained on the hot water supply side, or in step 108, the elapsed time T output from the Q timer. _Q Until the end of the capacity adjustment control standby time.
[0063]
According to this embodiment, when the bath burner device 6 is combusted during the Q function standby by the above operation, the circulating hot water temperature is slightly lower than the set temperature of the bath according to the circulating hot water detection temperature. When the temperature is equal to or higher than the reference set temperature A, the combustion capacity of the bath burner device 6 is set to the minimum combustion capacity, and therefore, the rotational speed of the combustion fan 8 at this time is small. As shown by the characteristic line b in FIG. 8, it does not drop extremely or the post-boiling temperature does not rise extremely as shown by the characteristic line c, and is estimated by the amount of combustion heat before the hot water supply combustion is stopped. A residual hot water temperature characteristic that is substantially close to the detected estimated temperature characteristic line a is obtained. Therefore, the set waiting time T _R When re-bathing is performed, it becomes possible to control the re-bath hot water temperature stabilization based on the characteristic line a, and the Q function can be achieved.
[0064]
In addition, when the circulating hot water detection temperature is lower than the reference set temperature A, for example, when the hot water from the bathtub is reheated from the water state to boil the bath, the bath combustion number is increased to maximize the combustion capacity. Therefore, unlike the combustion apparatus having only the Q function, the bath reheating operation can be performed in the shortest time.
[0065]
As described above, when the bath burner combustion is performed at the maximum combustion capacity, when the hot water is re-drained on the hot water supply side, the hot water temperature becomes a hot water temperature that deviates from the temperature set by the remote control. Usually, a shower is not often used while boiling a bath from water, so there is not much trouble caused by fluctuations in the hot spring water temperature. Also, when the circulating hot water detection temperature is above the reference set temperature and close to the bath set temperature, even if the burner burns with the minimum combustion capacity, it takes a long time to repel and the user feels uncomfortable. In addition, when the temperature of the circulating hot water detected is high, even if the combustion capacity of the bath burner device 6 is reduced, condensation does not easily occur in the reheating heat exchanger 16 or the like. There are no problems such as 16 durability degradation.
[0066]
Next, a second embodiment of the composite water heater of the present invention will be described. Like the first embodiment, the present embodiment also has the control unit circuit configuration shown in FIG. 1, and this embodiment differs from the first embodiment in that it is characteristic. In the bath capacity data storage unit 51, the data of the combustion capacity of the bath burner device 6 when the reheating of the bath burner device 6 is performed during the set standby time is used as the hot water supply operation condition parameter before stopping the hot water supply combustion. The hot water supply operation conditions before stopping the hot water supply combustion and stored in the operating condition parameter storage unit 49 and the data stored in the bath capacity data storage unit 51 This is because the combustion capability of the bath burner device 6 is controlled by checking the parameters.
[0067]
In the present embodiment example, in the bath capacity data storage unit 51, the hot water operation condition parameter before hot water combustion stop is given by the amount of hot water discharged, and the horizontal axis of the graph shown in FIG. Instead of the circulating hot water temperature, data replaced with the amount of tapping before stopping the hot water supply operation is given. Data on the minimum combustion capacity is given in the range where the amount of hot water is greater than or equal to the reference set amount of hot water, and data on the maximum combustion capacity is given in the range where the amount of discharged hot water is less than the reference set amount of hot water. It should be noted that this graph data may have a hysteresis as shown by a broken line in the same figure in order to prevent hunting, as in the first embodiment.
[0068]
The other configuration of the present embodiment is the same as that of the first embodiment. In this embodiment, the determination operation by the bath capacity adjustment control unit 50 in step 104 in the flowchart shown in FIG. 4 is performed based on the amount of hot water before stopping hot water combustion, and when the amount of hot water is equal to or greater than the reference amount of hot water. In step 106, the bath burner number is reduced and bath burner combustion control is performed with the minimum combustion capacity.When the amount of discharged hot water is less than the standard amount of discharged hot water, the bath combustion number is increased in step 105 and the maximum is set. Bath burner combustion control with combustion capacity is performed.
[0069]
Therefore, according to the present embodiment, when the amount of hot water before the hot water supply combustion stop is large and it is estimated that the user of the composite water heater is intermittently using a shower or the like, the Q is higher than the bath burner combustion. Since the achievement of the function is prioritized, the fluctuation of the re-departing hot water temperature becomes small, and even if the body is sensitive to the temperature fluctuation, the user can use the hot water comfortably, When the amount of hot water is small and it is estimated that a small amount of hot water is discharged intermittently in the kitchen, etc., the bath burner combustion is given priority and the bath boiling time can be shortened. The same effects as in the embodiment can be obtained.
[0070]
Next, a third embodiment of the composite water heater of the present invention will be described. The present embodiment also has the same system configuration as the first and second embodiments, and has the control circuit shown in FIG. The difference between the present embodiment example and the above embodiment example is that the bath burner apparatus 6 performs the combustion of the bath burner apparatus 6 without performing re-bathing during the set standby time in the bath capacity data storage unit 51. 6 is provided according to the case where the operation before the combustion stop of the hot water supply burner device 5 is the operation in the hot water filling mode and the operation in the water retention mode, and the bath capacity adjustment control unit 50 This means that the bath burner combustion is controlled corresponding to the difference in this mode.
[0071]
In the bath capacity data storage unit 51 in the present embodiment, when the operation before stopping the combustion of the hot water supply burner device 6 is the operation in the hot water filling mode with the pouring valve 35 opened, the data on the maximum combustion capacity is stored in the bath capacity data storage unit 51. In the case of the operation in the water retention mode, the minimum combustion capacity data is given as the bath capacity data.
[0072]
The bath capacity adjustment control unit 50 reads the hot water operation mode information before stopping the hot water combustion stored in the operation condition parameter storage unit 49 when the combustion of the bath burner device 6 is performed during the Q function standby, The combustion capacity of the bath burner device 6 during the Q function standby is controlled with the combustion capacity corresponding to the information of the operation mode of the hot water supply before stopping the hot water supply combustion, by comparing with the data in the bath capacity data storage unit 51.
[0073]
The present embodiment is configured as described above. As shown in the flowchart of FIG. 5, when it is determined in step 201 that combustion of the hot-water supply burner device 5 is being performed, in step 208, pouring is performed. It is determined whether or not the valve 35 is open, and when the pouring valve 35 is open, the pouring valve ON result flag is set at step 209, while when the pouring valve 35 is closed, at step 210 Then, the pouring valve ON result flag is cleared, and in this state, the process returns to step 201. When it is determined in step 201 that the hot water supply combustion is stopped, the process proceeds to step 202.
[0074]
When it is determined in step 202 that the combustion of the bath burner device 6 has been performed, it is determined in step 203 whether or not the Q function is on standby. When the Q function is not on standby, the maximum combustion capacity is determined in step 207. When the bath burner is burned in the state and the Q function is on standby, the routine proceeds to step 204.
[0075]
In step 204, it is determined whether or not the combined water heater is operating in the heat retaining mode. If it is determined that the combined water heater is operating in the heat retaining mode, the hot water injection valve 35 is opened before the hot water combustion is stopped. Even if hot water has been poured, this hot water pouring is performed by the operation of the water retention mode, and the circulating hot water detection temperature is almost the set temperature. The combustion is performed with the minimum combustion capacity.
[0076]
Further, when it is determined in step 204 that the operation in the heat insulation mode is not being performed, it is determined in step 205 whether or not the pouring valve ON result flag is set. In this case, the bath burner device 6 is burned at the maximum combustion capacity at step 207, so that it is determined that the hot water pouring was being operated in the hot water filling mode with the pouring valve 35 opened. If it is determined in 205 that the pouring valve ON result flag is not set, it is determined that the operation before the hot water combustion stop is not in the hot water filling mode. The bath burner is burned.
[0077]
According to this embodiment, when the bath burner device 6 is combusted during the Q function standby by the above operation, the pouring operation before the hot water supply combustion stop is an operation in the hot water filling mode, When it is necessary to boil the water quickly, the bath burner combustion is prioritized over the Q function and combustion is performed at the maximum combustion capacity, so that the bath boiling time can be shortened. The operation before stopping the combustion is the operation in the water retention mode during the heat retention mode, and the circulating hot water detection temperature is almost the set temperature, so it does not take a long time to boil up even if the bath burner combustion is performed with a small combustion capacity In such a case, the Q function is achieved, and the same effects as in the first and second embodiments are obtained.
[0078]
Next, a fourth embodiment of the composite water heater of the present invention will be described with reference to FIG. The most distinctive feature of the present embodiment example from the first, second, and third embodiment examples is that a release section setting unit 54 is provided. In this embodiment, the memory 46 stores the set standby time T as described above. _R (For example, 510 seconds), release interval T _S (For example, 90 seconds) is given in advance, and the in-appliance reference temperature and the release interval correction data are obtained in advance through experiments and calculations. The release section correction data is correction section data for correcting the release section in a direction to shorten the release section as the amount of decrease in the appliance temperature with respect to the reference temperature in the appliance increases. It is given as table data or graph data corresponding to the amount of decrease in the temperature in the appliance continuously or stepwise, or as arithmetic expression data.
[0079]
When the hot water supply combustion is stopped and the hot water supply combustion control unit 43 outputs a hot water supply combustion stop signal, the release section setting unit 54 starts taking in the detection tool internal temperature in the tool internal temperature sensor 53, and When the detected internal temperature of the memory 46 is lower than the internal reference temperature of the memory 46, the detected internal temperature is subtracted from the internal reference temperature, and the amount of decrease in the detected internal temperature relative to the internal reference temperature is calculated. calculate.
[0080]
Canceled section T _S Is set on the assumption that the temperature inside the appliance is equal to or higher than the reference temperature inside the appliance. The cooling promotion phenomenon resulting from the rotational driving of the slag will appear greatly. In order to suppress the amount of the cooling acceleration phenomenon that appears greatly, the release interval T is equal to the decrease in the internal temperature of the appliance relative to the internal temperature of the appliance. _S It becomes necessary to correct in the direction of shortening.
[0081]
Therefore, as described above, the release section setting unit 54 needs to perform correction for shortening the release section according to the magnitude of the amount of drop when the temperature inside the detected appliance falls below the reference temperature in the appliance and the amount of drop is calculated. The calculated descent amount is compared with the release interval correction data in the memory 46 to detect a correction interval corresponding to the calculated descent amount, and the release interval T in the memory 46 is detected. _S Read-out period T _S Is corrected so as to be shortened by the correction interval, and the correction cancellation interval is output to the ability adjustment stop unit 45.
[0082]
It should be noted that the detection of the temperature inside the detection tool in the temperature sensor 53 inside the appliance and the comparison operation between the temperature inside the detection tool and the reference temperature in the tool are corrected from the start of hot water combustion stop (released when correction is not performed). Section T _S ) Is repeated until the start time of), and if the detected internal temperature is lower than the internal reference temperature as a result of comparison between the detected internal temperature and the internal reference temperature, the correction cancellation interval is detected and continued. The
[0083]
When receiving the correction cancellation section (for example, 80 seconds) of the cancellation section setting section 54, the capacity adjustment stop section 45 receives the set standby time T _R By subtracting the correction cancellation section from (for example, 510 seconds), the correction capacity adjustment control standby time (for example, 430 seconds) is calculated, and the previously calculated capacity adjustment control standby time (for example, 420 seconds) is used as the correction capacity adjustment control standby time (for 430 seconds). And change the capacity adjustment control standby time.
[0084]
The capacity adjustment stop unit 45 samples the measurement time of the elapsed time measuring means 44 as in the first to third embodiments, and the elapsed time T from when the hot water supply combustion stopped. _Q When the capacity adjustment control standby time is exceeded, the cancellation interval correction operation of the cancellation interval setting unit 54 is terminated.
[0085]
According to the fourth embodiment, the same effects as those of the first to third embodiments are obtained, and further, the temperature inside the appliance is lower than the reference temperature inside the appliance, so that a cooling promotion phenomenon is assumed. Even if it appears larger than the above, the release interval is shortened and corrected according to the amount of decrease in the internal temperature of the appliance relative to the reference temperature in the appliance, so the influence time portion where the cooling acceleration phenomenon is larger than that assumed is removed from the release interval. Therefore, even if there is a large drop in the temperature in the appliance, it is possible to reliably stabilize the re-watering hot water temperature.
[0086]
Hereinafter, a fifth embodiment will be described with reference to FIG. The difference between the present embodiment example and the fourth embodiment example is that the release section is not given fixedly in advance, and the release section setting unit 54 sets the release section itself according to the temperature in the appliance. This is what I did. In this embodiment, the memory 46 has a set waiting time T as in the above embodiment. _R In this embodiment, the release interval data whose release interval becomes shorter as the in-appliance temperature decreases is obtained by experiment, calculation, etc., and is a table corresponding to the in-appliance temperature continuously or stepwise. It is given as data, graph data, or arithmetic expression data.
[0087]
When the hot water supply combustion is stopped and the hot water supply combustion control unit 43 outputs a hot water supply combustion stop signal, the release section setting unit 54 starts sampling the internal temperature of the appliance detected by the internal temperature sensor 53, and the sampling value of the internal temperature of the appliance Is compared with the release interval data in the memory 46, the release interval corresponding to the sampling value is detected and set, and output to the ability adjustment stop unit 45. Note that the release section is detected and updated every time the temperature in the appliance is sampled.
[0088]
When receiving the release section detected and set by the release section setting section 54, the capacity adjustment stop unit 45 receives the set standby time T _R The ability adjustment control standby time is calculated by subtracting the release section from the current capacity, and when the capacity adjustment control standby time has been previously calculated, the previous capacity adjustment control standby time is replaced with the newly calculated ability adjustment control standby time, and the capacity adjustment control is performed. Change the waiting time.
[0089]
The capacity adjustment stop unit 45 samples the measurement time of the elapsed time measuring means 44 in the same manner as in the first to third embodiments, and the elapsed time T from the hot water combustion stop. _Q When the capacity adjustment control standby time indicating that the vehicle has entered the release zone has been exceeded, it is determined that it is not necessary to set the release zone, and a release zone setting end signal is output to the release zone setting unit 54 Then, the setting operation of the release section is finished.
[0090]
Since the configuration other than the above is the same as that of the fourth embodiment, the description thereof is omitted.
[0091]
According to the fifth embodiment, the release section is set corresponding to the temperature in the appliance, so that the same excellent effect as that of the fourth embodiment can be obtained.
[0092]
The present invention is not limited to the above-described embodiments, and can take various forms. For example, in each of the embodiments described above, when the flow rate sensor 41 of the hot water supply combustion control unit 43 detects the stop of flowing water or the start of flowing water, it is determined that the hot water combustion has stopped or started, and a signal to notify the hot water combustion stop or the hot water combustion start The start / stop signal for hot water combustion is determined based on other sensor output information such as frame rod electrodes and the open / close signal of the solenoid valve 37 in the gas supply passage of the hot water burner device 5. However, as described above, a signal indicating the start / stop of hot water supply combustion may be output.
[0093]
Further, in the first embodiment, as shown in FIG. 2A, the bath capacity data storage unit 51 stores data on the minimum combustion capacity in the range where the temperature of the bathtub hot water is equal to or higher than the reference set temperature. In the range where the bath water temperature is lower than the reference set temperature, the maximum combustion capacity data is given. In the bath capacity data storage unit 51, for example, as shown in (b) and (c) of FIG. The bath capacity data may be given by increasing the decrease in the combustion capacity continuously or stepwise in proportion to the amount of increase in the temperature of the bath water. In addition, when giving bath capacity data as shown in (c) of the figure, as shown by the broken line in the figure, a hysteresis may be provided to prevent hunting.
[0094]
Even when such bath capacity data is given to the bath capacity data storage unit 51, the bath capacity adjustment control unit 50 sets the bath capacity data corresponding to the circulating hot / cold water detection temperature based on such relation data. The combustion capability of the bath burner device 6 during the Q function standby is controlled with the combustion capability of the obtained bath capability data.
[0095]
Further, in the second embodiment, the bath capacity data storage unit 51 gives the data of the minimum combustion capacity when the amount of hot water discharged before the hot water combustion is stopped exceeds the reference set amount of hot water. However, when the bath capacity data is given by the amount of hot water discharged from the hot water supply, for example, as shown in (b) or (c) of FIG. Alternatively, bath capacity data in which the decrease amount of the combustion capacity is increased continuously or stepwise in proportion to the increase amount of the hot water may be given. Also in this case, hysteresis may be provided to prevent hunting as shown by the broken line in FIG.
[0096]
As described above, as the bath capacity data to be given to the bath capacity data storage unit 51, as shown in (b) and (c) of FIG. If the amount of decrease in the combustion capacity is increased in proportion to the temperature of the hot water, for example, the bath burner combustion capacity can be finely adjusted and controlled depending on the temperature of the bath water, or the amount of hot water discharged during use varies depending on the person using the shower etc. In addition, since it is possible to finely adjust and control the combustion capacity of the bath burner during the Q function standby according to the amount of hot water, the influence of the bath burner device 6 on the combustion can be reduced.
[0097]
Furthermore, bath capacity data storage unit 51 is provided with bath capacity data corresponding to parameters other than the amount of hot water discharged as hot water operation condition parameters before stopping hot water combustion, and this data and hot water operation condition parameters before stopping hot water combustion May be collated by the bath capacity adjustment control unit 50 to control the combustion capacity of the bath burner device 6 during the Q function standby with the combustion capacity of the bath capacity data according to the hot water supply operating condition parameter.
[0098]
Further, in each of the above embodiment examples, a release section is set on the near side from the end point of the set standby time, and the capacity adjustment control standby time obtained by subtracting the release section from the hot water combustion stop time is obtained. Although the bath burner combustion is controlled when the combustion of the bath burner device 6 is performed without being performed, it is not always necessary to set the release section, and the ability from the hot water combustion stop to the end of the set standby time is possible It is good also as an adjustment control state (Q function standby state).
[0099]
Furthermore, in the above embodiment example, the composite water heater having the system configuration shown in FIG. 6 is targeted. However, the composite water heater of the present invention has separate hot water supply side and bath side as shown in FIG. It is good also as a compound water heater which has the combustion fans 8 and 9 of these. Also at this time, when the rotation of the combustion fan 9 is adjusted and controlled in accordance with the adjustment control of the bath burner combustion, the rotation of the combustion fan 8 on the hot water supply burner device 5 side is also adjusted in conjunction with the rotation of the combustion fan 9. Thus, the same effects as those of the above embodiment can be obtained.
[0100]
Furthermore, in the above embodiment, the in-appliance temperature sensor 53 is provided on the side surface side of the nozzle holder 12 on the hot water supply side, but the in-appliance temperature sensor 53 is not necessarily provided on the side surface side of the nozzle holder 12, The temperature in the appliance may be omitted in some cases, and may be omitted.
[0101]
Furthermore, in the above embodiment, one gas proportional valve 38 is provided in the gas supply passage 36. However, as shown in FIG. 9, the gas supply passage 36 is branched to the hot water supply side and the bath side. Gas proportional valves 38a and 38b may be provided respectively. When configured in this manner, the hot water-side gas proportional valve 38a is controlled by the hot-water supply combustion control unit 43, and the bath-side gas proportional valve 38b is controlled by the bath combustion control unit 48, as shown by the chain line in FIG. It will be.
[0102]
Further, in the above-described embodiment example, the composite water heater that performs combustion operation using gas as fuel has been described. However, the composite water heater of the present invention is also applied to a composite water heater that uses other fuels such as oil. is there.
[0103]
【The invention's effect】
According to the present invention, when the bath burner is burned without re-bathing during the set standby time from the hot water supply combustion stop time preset to the longest re-bath start time as the re-bath hot water temperature stabilization possible time, The bath capacity adjustment controller controls the bath burner based on various parameters such as the hot water operating condition parameters before stopping hot water combustion, the temperature of the hot water in the bathtub when the bath burner starts burning, and the type of operation mode before stopping hot water combustion. Therefore, when bath burner combustion is performed during the set standby time, it is determined whether priority should be given to hot water temperature stabilization control or bath burner combustion. By making accurate decisions based on each parameter and controlling the combustion capacity of the bath burner, the balance between bath burner combustion and re-heated water temperature stabilization control is achieved, and the user can use it with ease. It becomes possible to composite water heater that can be. And, for example, during the set standby time, unlike the case where the combustion of the bath burner is always performed with the minimum combustion capacity, it can be used comfortably for a long time without shortening the life of the reheating heat exchanger. A composite water heater with a long life can be provided.
[0104]
In addition, in the configuration in which the release section is provided, when the combustion of the bath burner is not performed from the time when the hot water combustion is stopped to the start of the release section, even if the combustion of the bath burner is started in the release section, the bath combustion capability Therefore, it is possible to alleviate problems such as poor usability due to control of lowering bath combustion capacity, deterioration of durability of appliances, etc. Can be made.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a main part of a control unit of an embodiment of a composite water heater according to the present invention.
FIG. 2 is a graph showing an example of bath capacity data given to a bath capacity data storage unit provided in the control unit of the embodiment.
FIG. 3 is an explanatory view showing a setting example of a release section in the composite water heater according to the present invention.
FIG. 4 is a flowchart showing an example of the operation of the embodiment.
FIG. 5 is a flowchart showing another example of the operation of the embodiment.
FIG. 6 is a system configuration diagram showing an example of a composite water heater of a type in which exhaust gas from a hot water supply burner and exhaust gas from a bath burner are discharged from a common exhaust port.
FIG. 7 is a system configuration diagram showing another example of a composite water heater of a type in which exhaust gas from a hot water supply burner and exhaust gas from a bath burner are discharged from a common exhaust port.
FIG. 8 is an explanatory view of a temporal change in residual hot water temperature in the hot water heat exchanger after the hot water combustion is stopped.
FIG. 9 is a diagram illustrating the configuration of another embodiment of the composite water heater according to the present invention.
[Explanation of symbols]
8,9 Combustion fan
42 Exhaust vent
43 Hot water combustion control unit
44 Elapsed time measurement means
45 Capacity adjustment stop
48 Bath combustion controller
49 Operating condition parameter storage
50 Bath capacity adjustment control unit
51 Bath capacity data storage
53 Internal temperature sensor
54 Release section setting section

Claims

A hot water supply burner that performs heating combustion of the hot water supply heat exchanger, a bath burner that performs heating combustion of the reheating heat exchanger, and a common or individual combustion fan that performs supply and exhaust of the hot water supply burner combustion and bath burner combustion When the exhaust gas of the hot water supply burner and the exhaust gas of the bath burner are discharged from a common exhaust port, and provided with a combustion fan for separately supplying and exhausting the hot water burner combustion and the bath burner combustion, the bath burner combustion in sometimes the hot water supply burner for feeding exhaust combustion combustion fan and bath burner for feeding exhaust combustion combustion fan and both combustion fan composite water heater types you want to rotate. of advance as a re-pouring hot water temperature stabilization uptime The bath burner combustion capacity data when the burner burns during the set standby time from the set hot water combustion stop to the start of the longest re-watering is bath capacity data. Bath capacity data storage unit given according to the hot water operation condition parameter before hot water combustion stop, elapsed time measuring means for measuring the elapsed time from hot water combustion stop to re-draining, hot water combustion stop An operation condition parameter storage unit that stores a previous hot water supply operation condition parameter, and a hot water supply operation condition before hot water combustion stop stored in the operation condition parameter storage unit when the combustion of the bath burner is performed during the set standby time Compares the parameters and the data stored in the bath capacity data storage unit, and controls the combustion capacity of the bath burner during the set standby time with the combustion capacity of the bath capacity data according to the hot water operating condition parameter before stopping hot water combustion And a bath capacity adjustment control unit.

The hot water supply operating condition parameter is given by the amount of hot water discharged, and the bath capacity data storage section is divided into a case where the amount of hot water is greater than or equal to the standard set amount of hot water and a case where the amount is less than the standard set amount of hot water. The combined water heater according to claim 1, wherein data on the minimum combustion capacity is given in a range above the amount of hot water, and data on the maximum combustion capacity is given in a range where the amount of hot water is less than the reference set amount of hot water.

The hot water operation condition parameter is given by the amount of hot water discharged, and the bath capacity data storage unit is given bath capacity data in which the decrease in combustion capacity is increased continuously or stepwise in proportion to the increase in the amount of hot water. The composite water heater according to claim 1.

Hot water supply burner that heats and burns the hot water supply heat exchanger, bath burner that heats and burns the reheating heat exchanger built in the recirculation circuit that circulates the hot water in the bathtub, and the temperature of the circulating hot water in the recirculation circuit And a common or separate combustion fan for supplying and exhausting the hot water supply burner and bath burner combustion, and the exhaust gas of the hot water supply burner and the exhaust gas of the bath burner are supplied from a common exhaust port. In the case where a combustion fan that is discharged and performs supply and exhaust of the hot water supply burner combustion and bath burner combustion separately is provided, a combustion fan that performs supply and exhaust of the hot water supply burner combustion and supply and exhaust of the bath burner combustion during the bath burner combustion the in composite water heater types you want to rotate. both combustion fan and the combustion fan to perform, from the time of the hot water supply combustion stop in advance is set as the re-pouring hot water temperature stabilization uptime top A bath capacity data storage unit in which the burn capacity data of the bath burner when the burn of the bath burner is performed during the set waiting time until the start of re-watering is given as the bath capacity data as a temperature of the bath water, and hot water supply Elapsed time measurement means that measures the passage of time from when combustion stops until re-heating, and when the bath hot water is recirculated during the set waiting time and the bath burner is burned, detected by the bath temperature sensor The bath capacity data corresponding to the circulating hot water detection temperature is obtained from the data in the bath capacity data storage unit, and the bath burner during the set standby time with the combustion capacity of the obtained bath capacity data is obtained. And a bath capacity adjustment control section for controlling the combustion capacity of the composite water heater.

The bath capacity data storage section is divided into a case where the temperature of the bathtub hot water is higher than the reference set temperature and a case where the temperature of the bath hot water is lower than the reference set temperature. 5. The combined water heater according to claim 4, wherein maximum combustion capacity data is provided in a range below the reference set temperature.

The composite water heater according to claim 4, wherein the bath capacity data storage unit is provided with bath capacity data in which the amount of decrease in the combustion capacity is increased continuously or stepwise in proportion to the amount of rise in the temperature of the bath water.

Hot water supply burner that heats and burns the hot water supply heat exchanger, bath burner that heats and burns the reheating heat exchanger built in the recirculation circuit that circulates the bath water, and hot water on the outlet side of the hot water heat exchanger A hot water supply passage that connects the passage and the recirculation circuit via a hot water control valve, and a common or individual combustion fan that supplies and discharges the hot water burner combustion and the bath burner combustion. When the gas and the exhaust gas of the bath burner are discharged from a common exhaust port, and a combustion fan is provided to perform supply and exhaust of the hot water supply burner combustion and bath burner combustion separately, the hot water supply burner combustion is performed at the time of bath burner combustion combustion fan and a bath in a type of composite water heater both combustion fan Ru rotates the combustion fan for feeding exhaust burner combustion, hot water filling mode by opening the pouring control valve for feeding exhaust It has a water retention mode function that keeps the bath water level at the set water level, and the burner burns during the set waiting time from the hot water combustion stop time to the start of the longest hot water discharge, which is set in advance as the time for stabilizing the hot water temperature. A bath capacity data storage unit is provided in which the combustion capacity data of the bath burner is given as bath capacity data, and the operation before the hot water burner stops combustion opens the pouring control valve. The maximum combustion capacity data is given for the hot water filling mode operation, and the minimum combustion capacity data is given for the water retention mode operation. When an elapsed time measuring means for measuring the passage of time and a hot water filling mode operation or a water retention mode operation by hot water combustion are performed, at least information on the operation mode is provided. An operating condition parameter storage unit that stores the hot water after the hot water combustion is stopped and re-drains, and a hot water combustion before the hot water combustion is stopped that is stored in the operating condition parameter storage unit when the bath burner is burned during the set standby time. The hot water operation mode information is read and compared with the data in the bath capacity parameter storage unit, and the combustion capacity of the bath burner during the set standby time is controlled by the combustion capacity according to the hot water operation mode information before stopping hot water combustion. And a bath capacity adjustment control unit.

A release section is set on the near side from the end of the set standby time from the hot water combustion stop to the start of re-heating, and there is no use of the bath burner within the time from the start of the set standby time to the start of the release section 8. A capability adjustment stop unit that stops a function of a bath capability adjustment control unit when the bath burner burns during a subsequent hot water supply combustion stop when it is detected is provided. Combined water heater described in 1.

An in-appliance temperature sensor for detecting the in-appliance temperature is provided, and when the in-appliance detection temperature detected by the in-appliance temperature sensor is lower than a pre-applied reference temperature, the temperature is continuously changed according to the amount of temperature decrease. Or the composite water heater of Claim 8 in which the cancellation | release area setting part which correct | amends in the direction which reduces the time width of a cancellation | release area in steps is provided.

An internal temperature sensor for detecting the internal temperature of the apparatus, a memory in which data of a release section that varies depending on the internal temperature of the apparatus is provided corresponding to the internal temperature of the apparatus, and an internal detection temperature detected by the internal temperature sensor. The combined water heater according to claim 8, further comprising a release section setting unit that sets a release section corresponding to the detected temperature in the appliance from the stored data stored in the memory.