JP3714068B2

JP3714068B2 - Bath pot device with hot water supply function

Info

Publication number: JP3714068B2
Application number: JP33737299A
Authority: JP
Inventors: 智宏西畑
Original assignee: Noritz Corp
Current assignee: Noritz Corp
Priority date: 1999-11-29
Filing date: 1999-11-29
Publication date: 2005-11-09
Anticipated expiration: 2019-11-29
Also published as: JP2001153457A

Description

【０００１】
【発明の属する技術分野】
本発明は給湯機能付風呂釜装置に関し、詳しくは風呂追い焚き用熱交換器と温水給湯用熱交換器とを１つのバーナで加熱するようにした１缶２回路式の給湯機能付風呂釜装置に関する。
【０００２】
【従来の技術】
バーナを共有する１缶２回路式の給湯機能付風呂釜装置にあっては、風呂追い焚き運転を単独で行っている時に、同じ缶体内に配置された温水給湯用の熱交換器が水流のないまま加熱される結果、温度が過剰に上昇し、沸騰音の発生、熱応力の発生等の問題を引き起こす。このため、従来は温水給湯用熱交換器内の温度を監視し、温度がある一定の温度以上になると風呂追い焚き運転を一時的に停止したり、バーナの燃焼入力を低下させたりしていた。
また本願出願人は特開平６−１５９８０１号において、温水給湯用熱交換器内の温度がある一定の温度以上になると、温水給湯回路から一定時間または一定水量を落とし込み路を通して浴槽に落とし込むようにした１缶２回路給湯機能付風呂釜装置を提供している。
【０００３】
【発明が解決しようとする課題】
ところが従来のように温水給湯用熱交換器内の温水温度が過剰に上昇するのを防止するために、風呂追い焚き運転を一時的に停止したり、バーナの燃焼入力を低下する方式では、逆に風呂の追い焚きの出力が十分に出ないという問題があった。
また温水給湯用熱交換器内の温水温度が一定の温度以上になると一定時間または一定水量を排水する方式のものでは、その排水によって温水給湯用熱交換器内の温水温度を確実に所定温度以下にできるとは限らない。また排水によって温水給湯用熱交換器内の温水温度を必要以上に低下させる結果、バーナ燃焼の熱量を多く奪うことになって、風呂追い焚き用熱交換器への燃焼熱の供給量を低下させる問題が生じる。更に、放出水量を多く設定する場合には、必要以上の水が浴槽内に放出される問題も生じる。
【０００４】
そこで本発明は上記従来の給湯機能付風呂釜装置の欠点を解消し、風呂追い焚き運転が単独で行われている場合に、温水給湯用熱交換器内の温水が過熱状態になるのを防止し、沸騰音の発生を緩和し、また温水給湯用熱交換器内に発生する熱応力を緩和すると共に、風呂追い焚き運転における出力の低下や、沸き上げの遅延等の追い焚き効率の低下を少なくして、風呂追い焚き運転を効率良く行うことができるようにし、更に浴槽内に必要以上の排水がなされないようにすることができる給湯機能付風呂釜装置の提供を課題とする。
【０００５】
【課題を解決するための手段】
上記課題を解決するため、本発明の給湯機能付風呂釜装置は、風呂追い焚き用熱交換器と温水給湯用熱交換器とを１つのバーナで加熱するようにした１缶２回路式の給湯機能付風呂釜装置であって、前記温水給湯用熱交換器で熱交換加熱された温水を温水給湯回路の風呂自動給湯路を介して風呂追い焚き循環路に落とし込むことで浴槽への湯張りができるようにしたものにおいて、前記風呂自動給湯路に流量調節を可能とした制御弁を設け、一方、前記温水給湯用熱交換器内の温水温度を直接或いは間接的に検出する手段を設け、温水給湯用熱交換器内の温水温水温度が一定の基準温度以上の高温になると前記制御弁を流量調節可能に開放すると共に前記基準温度を超える温度の程度に応じて前記制御弁による排出流量を変更して温水給湯回路内の温水を浴槽側に排出するように構成したことを第１の特徴としている。
また本発明の給湯機能付風呂釜装置は、上記第１の特徴に加えて、温水給湯用熱交換器内の温水温度を直接検出する温度センサを設けたことを第２の特徴としている。
また本発明の給湯機能付風呂釜装置は、上記第１の特徴に加えて、温水給湯用熱交換器内の温水温度を、風呂追い焚き循環路の循環復路に設けられた風呂温度センサによる検出温度とバーナでの燃焼熱量とから推定するように構成したことを第３の特徴としている。
また本発明の給湯機能付風呂釜装置は、上記第１の特徴に加えて、温水給湯用熱交換器内の温水温度を、風呂追い焚き循環路の循環復路に設けられた風呂温度センサによる検出温度と風呂追い焚き循環路の循環往路に設けられた循環往路温度センサによる検出温度とバーナでの燃焼熱量とから推定するように構成したことを第４の特徴としている。
【０００６】
上記第１の特徴によれば、温水給湯用熱交換器内の温水温度が一定の基準温度以上になると、流量調節可能とした制御弁が開放されることで、該制御弁を通って給湯回路内の温水が風呂追い焚き循環路に排出される。よって温水給湯用熱交換器内の温水は前記排水される流量分だけ入れ替わって行き、過熱状態に加熱されるのが予防される。
なお基準温度については、例えば９０℃や９５℃とする等、沸騰の恐れや熱応力の発生につながる過熱状態を予防する上で適当な温度を予め実験により決定して、これをコントローラ等に記憶させておくことになる。
前記制御弁は、単なる開閉弁ではなく、流量調節が可能なものとすることで、制御弁を介して浴槽側に排出される量をできるだけ少なくし且つ温水給湯用熱交換器内の温水が過熱状態になるのを防止することができるような排出流量に調整することもできる。
以上、第１の特徴によれば、風呂追い焚き運転を一時的に停止したり、バーナの燃焼入力を低下させたりすることなく、温水給湯用熱交換器内の温水温度が基準温度を超えて過熱状態の高温となったり、又これによって沸騰音を発したり、熱応力が発生するのを防止し、或いは軽減することができる。しかも流量調節可能な制御弁を用いることで、風呂追い焚き循環路から浴槽内に排出される排水量が必要以上に多くなるのを防止することが可能となる。また必要以上の排水を行わないように調節することが可能であるので、温水給湯用熱交換器によって必要以上に燃焼熱が奪われるのを防止して、より多くの燃焼熱が風呂追い焚き用熱交換器に加わるようにすることが可能となる。
【０００７】
また特に上記第１の特徴によれば、温水給湯用熱交換器内の温度が基準温度以上になると、制御弁が開放されることになるが、その開放の程度は、基準温度を超える温度の程度に応じた開放の程度とすることができる。即ち、温水給湯用熱交換器内の温水温度が基準温度を超えて高くなればなるほど開放の程度も大きくして排出流量を増やし、また基準温度を超えていても僅かだけ超えているような場合には排出流量が絞られることになる。これによって、温水給湯用熱交換器内の温水温度を基準温度以下にするのに必要最小限の排水量をもって行うことが可能となり、浴槽内への排出量をより適切に少なく抑えることができると共に、温水給湯用熱交換器において奪われる熱量をより少なくして、風呂追い焚き用熱交換器に加わる熱量をより効果的に多くすることが可能となる。
前記において、基準温度を超える温度の程度に応じて制御弁による排出流量を変更する場合の仕方としては、基準温度を超える温度を段階的に１乃至複数定め、各温度になると、段階的に制御弁の開度を増加させて行くようにすることができる。また基準温度を超える温度の増減に対して無段階的に比例して制御弁の開度が増減するようにしてもよい。勿論、温度が上昇して基準温度に達した際には制御弁を開放するが、一旦開放した制御弁を閉止するのは、前記基準温度よりも多少温度が低い一定温度としてもよい。
以上、特に第１の特徴によれば、基準温度を超える温度の程度に応じて制御弁による排出流量を変更することで、基準温度を超える温水給湯用熱交換器内の温水温度に応じた必要十分な排水がより確実に行え、温水給湯用熱交換器内の温水の過熱による不都合を十分に解消し、また浴槽への排水量をより必要最小限に抑え、加えて風呂追い焚き用熱交換器に加わる熱量の低下を一層好ましく抑制することができる。
【０００８】
また上記第２の特徴によれば、第１の特徴による作用効果に加えて、温度センサを設けて温水給湯用熱交換器内の温水温度を直接検出することができ、浴槽給湯用熱交換器内の温水温度を正確に検出して、制御弁を駆動させることが可能となる。
【０００９】
また上記第３の特徴によれば、第１の特徴による作用効果に加えて、温水給湯用熱交換器内の温水温度の検出を風呂追い焚き循環路の循環復路に設けられた温度センサによる検出温度とバーナの燃焼熱量とから推定するようにしたことで、温水給湯用熱交換器内の温水温度を検出するための温度センサを必要としない。
前記風呂追い焚き循環路の循環復路に設けられた温度センサによる検出温度とバーナの燃焼熱量とからの温水給湯用熱交換器内の温水温度の検出は、予め実験により、風呂追い焚き循環路の浴槽から風呂追い焚き用熱交換器への循環復路の温度と、バーナの燃焼熱量と、温水給湯用熱交換器内の温水温度との関係を得て、例えばバーナの燃焼熱量毎に前記循環復路の温度と温水給湯用熱交換器内の温水温度との関係を関係式やテーブルでコントローラ等に記憶させておくことによって行うことができる。
【００１０】
また上記第４の特徴によれば、第１の特徴による作用効果に加えて、温水給湯用熱交換器内の温水温度の検出を、風呂追い焚き循環路の循環復路に設けられた温度センサによる検出温度と風呂追い焚き循環路の循環往路に設けられた温度センサによる検出温度とバーナの燃焼熱量とから推定するようにしたことで、温水給湯用熱交換器内の温水温度を検出するための温度センサを必要としない。また循環復路の検出温度と循環往路の検出温度とから風呂追い焚き循環路の循環流量を得ることができ、循環流量毎に温水給湯用熱交換器内の温水温度を推定することができ、より正確な温度推定と排水制御とが可能となる。
風呂追い焚き循環は風呂追い焚き循環路に設けた循環ポンプにより行うが、この循環ポンプの能力は通常は能力切り換えのないものであるから、循環流量も原則的には一定になるが、循環路の長さ等によって循環流量が異なってくる場合がある。また能力の切り換えができるような循環ポンプの場合には、その切り換えによって当然循環流量が異なってくる。風呂追い焚き循環路の循環量によって、他の循環復路の検出温度及び燃焼熱量が同じでも、温水給湯用熱交換器内の温水温度は異なってくる。
【００１１】
【発明の実施の形態】
以下、本発明の実施の形態を図面を参照しながら説明する。
図１は本発明の実施形態に係る給湯機能付風呂釜装置の概略構成図、図２は本発明の実施形態の一例を示す湯張り弁による排水の制御フローチャート、図３は温度センサによらずに温水給湯用熱交換器内の温水温度を推定する方法を説明する図、図４は本発明の実施形態の他の一例を示す湯張り弁による排水の制御フローチャート、図５は温度センサによらずに温水給湯用熱交換器内の温水温度を推定する他の方法を説明する図である。図６は本発明の実施形態の更に他の一例を示す湯張り弁による排水の制御フローチャートである。
【００１２】
図１を参照して、まず給湯機能付風呂釜装置の全体構成を説明する。
１０は缶体で、該缶体１０の内部でガスバーナ１１による燃焼が行われる。前記ガスバーナ１１はオイルバーナ等、他の種類のバーナであってもよい。バーナ１１の燃焼に対して送風機１２から空気が供給される。
前記缶体１０内の上部には、風呂追い焚き循環路２０の風呂追い焚き用熱交換器２１と、温水給湯回路３０の温水給湯用熱交換器３１とが配置されており、それらの熱交換器２１、３１が１個のガスバーナ１１で兼用されて加熱されるようになっている。
【００１３】
風呂追い焚き循環路２０は、前記風呂追い焚き用熱交換器２１の他、缶体１０（風呂追い焚き用熱交換器２１）からの温水を浴槽４０に導く循環往路２２と、浴槽４０からの温水を前記缶体１０（風呂追い焚き用熱交換器２１）に導く循環復路２３とからなる。循環往路２２と循環復路２３とは循環金具４１を介して浴槽４０に接続されている。
前記循環復路２３には、水流スイッチ５１と風呂温度センサ５２と風呂水位センサ５３と循環ポンプ５４が設けられている。
なお５５は循環往路２２と循環復路２３とを短絡するバイパス、５６は三方切換弁、５７は排水栓である。
【００１４】
温水給湯回路３０は、前記温水給湯用熱交換器３１の他、上水道等の水道からの水を缶体１０（温水給湯用熱交換器３１）に導く入水路３２と、缶体１０（温水給湯用熱交換器３１）で加熱された温水を出湯する出湯路３３と、該出湯路３３から分岐される一般給湯路３４及び風呂自動給湯路３５とからなる。
前記入水路３２には入水流量センサ６１と入水温度センサ６２とが設けられている。
また前記温水給湯用熱交換器３１には、該交換器３１内の温水温度を検出する熱交換器内温水温度センサ６３が設けられている。６４は残火安全装置である。また前記出湯路３３には出湯温度センサ６５と過流出防止調整弁６６とが設けられている。
なお６７は入水路３２と出湯路３３とのバイパスで、バイパス流量調節弁６８が設けられている。そしてバイパス６７の出湯路３３への合流点の下流に給湯温度センサ６９が設けられている。
【００１５】
前記風呂自動給湯路３５の途中に、流量調節を可能とした制御弁である湯張り弁７１を設けている。その下流に落とし込み流量検出センサ７２、逆流防止弁７３が設けられている。７４はバキュームブレーカである。
【００１６】
８０は装置のコントローラで、８１はリモコンである。このリモコン８１は、風呂運転用のリモコンと給湯運転用のリモコンのように複数個からなってもよい。コントローラ８０は装置各部に設けられたセンサからの情報を入力し、またリモコン８１による指令をうけて、内蔵されたソフトウエアにより所定の動作指令を装置各部に指令する。
【００１７】
今、装置のメイン運転スイッチが入っている状態において、風呂追い焚き運転がリモコン８１によって指令されると、コントローラ８０は、まず循環ポンプ５４を駆動する。そしてこれによって水流スイッチ５１が最低作動水量以上を検出すると、ガスバーナ１１の燃焼を開始する。浴槽水は缶体１０に循環し、風呂追い焚き用熱交換器２１において加熱され、風呂の追い焚きが行われる。風呂温度センサ５２が所定の風呂設定温度を検出すると、運転が終了される。
また、装置のメイン運転スイッチが入っている状態において、一般給湯路３４のカランが開かれた場合には、入水路３２を通って入水が行われ、入水流量センサ６１が最低作動水量以上を検出すると、コントローラ８０はガスバーナ１１を燃焼させる。出湯した温水は出湯路３３から一般給湯路３４を通って一般給湯される。
また、装置のメイン運転スイッチが入っている状態において、リモコン８１により風呂自動落とし込み運転が指令された場合には、コントローラ８０は湯張り弁７１を全開又は一定の開度で開放する。これによって入水流量センサ６１が最低作動水量以上を検出すると、ガスバーナ１１が燃焼され、出湯した温水が出湯路３３から風呂自動給湯路３５を通って、風呂追い焚き循環路２０に入り、更に循環往路２２と循環復路２３とからの両搬送で浴槽４０に落とし込まれる。設定流量を落とし込み流量検出センサ７２が検出すると、運転が終了される。
【００１８】
以上のような装置の機構及び機能において、風呂追い焚き運転が単独で行われる場合に、運転が行われていない温水給湯用熱交換器３１内では、水が水流のない停止状態のまま加熱されるため、温水温度が非常に高温な過熱状態に上昇されることがある。また温水給湯運転停止後に生じる後沸き現象によっても、温水給湯用熱交換器３１内の温水温度が非常に高温に過熱状態に上昇される場合がある。またその他の予期しないことで、温水給湯用熱交換器３１内の温水温度が高温に上昇されることがある。
温水給湯用熱交換器３１内の温水温度が上昇を続けると、やがて過熱状態となり、沸騰による沸騰音の発生や熱応力の発生をもたらすことになって、好ましくない。
【００１９】
そこで、前記温水給湯用熱交換器３１内の温水が過熱状態になることによる不都合を予防するために、前記温水給湯用熱交換器３１内の温度を直接或いは間接的に検出する手段を設けて、温水給湯用熱交換器３１内の温度が一定の基準温度以上になると、前記湯張り弁７１を流量調節可能に開放して、温水給湯回路内の温水を必要最小限となるようにして浴槽側に排出し、温水給湯用熱交換器内の温水温度を前記基準温度を超えないようにしている。
【００２０】
図２を参照して、温水給湯用熱交換器３１内の温水温度を熱交換器内温水温度センサ６３を用いて直接的に検出する場合の、湯張り弁７１による排水の制御を説明する。
今、リモコン８１によって、風呂追い焚き運転スイッチがオンされると（ステップＳ１でイエス）、コントローラ８０が循環ポンプ５４を駆動し、これによって水流スイッチ５１がオンすると、ガスバーナ１１の燃焼が開始され、風呂の追い焚き循環が開始される（ステップＳ２）。コントローラ８０は熱交換内温水温度センサ６３により温水給湯用熱交換器３１内の温水温度を検出し（ステップＳ３）、更に該検出温度Ｔが予め定めた基準温度Ｔ_Ｓ以上になっていないかを監視し（ステップＳ４）、以上になると（ステップＳ４でイエス）、湯張り弁７１の制御を開始する（ステップＳ５）。また前記基準温度Ｔ_Ｓ未満になると（ステップＳ４でノー）、湯張り弁７１の制御を終了する（ステップＳ５）。
前記湯張り弁７１の制御の仕方については後述する。
【００２１】
次に前記熱交換内温水温度センサ６３がない場合或いは用いずに、温水給湯用熱交換器３１内の温水温度を推定して検出する方法を図３を参照して説明する。１缶２回路式の場合、風呂追い焚き運転を単独で行っている場合における温水給湯用熱交換器３１内の温水温度の上昇は、循環復路２３の温度、風呂追い焚き循環路２０の循環流量、バーナ１１による燃焼熱量の３要素に影響される。即ち循環復路２３の温度が高くなると、温水給湯用熱交換器３１内の温水温度は高くなる。また循環流量が少ない程、温水給湯用熱交換器３１内の温水温度は高くなり易い。
今、循環ポンプ５４による循環流量を一定であるとして、ある燃焼熱量で風呂追い焚き運転を行った場合の、循環復路２３の温度と温水給湯用熱交換器３１内の温水温度との関係は、図３に示すような関係となる。即ち、循環復路２３の温度が時間の経過と共に上昇し、その温度がある一定温度Ｔ_１になると、温水給湯用熱交換器３１内の温水温度が基準温度Ｔ_Ｓになる。
従って、風呂追い焚き運転における循環流量が現に一定である、或いは一定であるとみなすことができるような装置においては、予め実験により、その一定の循環流量において、各燃焼熱量毎に循環復路２３の温度（風呂温度センサ５２の検出する温度）と温水給湯用熱交換器３１内の温水温度との関係を得て、これを関係式或いはテーブルにしてコントローラ８０に記憶させておくことで、温水給湯用熱交換器３１内の温水温度を推定して検出することができる。
【００２２】
図４に従って、風呂温度センサ５２の検出する温度と燃焼熱量とから温水給湯用熱交換器３１内の温水温度を推定検出して、湯張り弁７１を制御する例を説明する。
今、リモコン８１によって、風呂追い焚き運転スイッチがオンされると（ステップＳ１１でイエス）、コントローラ８０が循環ポンプ５４を駆動し、これによって水流スイッチ５１がオンすると、ガスバーナ１１の燃焼が開始され、風呂の追い焚き循環が開始される（ステップＳ１２）。コントローラ８０は風呂温度センサ５２により循環復路２３の温水温度を検出し（ステップＳ１３）、更にこの検出温度と燃焼が行われているバーナ１１の燃焼熱量とから、温水給湯用熱交換器３１内の温水温度を推定検出する（ステップＳ１４）。そして、得られた推定検出温度Ｔが予め定めた基準温度Ｔ_Ｓ以上になっていないかを監視し（ステップＳ１５）、以上になると（ステップＳ１５でイエス）、湯張り弁７１の制御を開始する（ステップＳ１６）。また前記基準温度Ｔ_Ｓ未満になると（ステップＳ１５でノー）、湯張り弁７１の制御を終了する（ステップＳ１７）。
【００２３】
次に前記熱交換内温水温度センサ６３がない場合或いは用いずに、温水給湯用熱交換器３１内の温水温度を推定して検出する他の方法を図５を参照して説明する。
図３に示す場合の方法では、風呂追い焚き運転における循環流量が一定であることを前提に温水給湯用熱交換器３１内の温水温度を推定したが、本例では、風呂追い焚き循環路２０を流れる循環流量も考慮して、温水給湯用熱交換器３１内の温水温度を推定する。温水給湯用熱交換器３１内の温水温度の上昇程度は風呂追い焚き循環路２０を流れる循環流量の如何によって異なってくるので、この方法は風呂釜装置として前記風呂追い焚き循環路２０の循環流量を切り換えることができるようなもの、或いは風呂追い焚き循環路２０の配管長さが変わり循環流量がわからないものに対して有効である。
今、異なる循環流量毎に、例えば循環流量Ａ、Ｂのそれぞれにおいて、ある一定の燃焼熱量で風呂追い焚き運転を行った場合の、循環復路２３の温度と温水給湯用熱交換器３１内の温水温度との関係は、図５に示すような関係となる。即ち、循環流量毎に異なる温度上昇カーブを示し、その温度がそれぞれ一定温度Ｔ_Ａ、Ｔ_Ｂになると、温水給湯用熱交換器３１内の温水温度が基準温度Ｔ_Ｓになる。従って、予め実験により種々の循環流量について、各燃焼熱量毎に循環復路２３の温度（風呂温度センサ５２の検出する温度）と温水給湯用熱交換器３１内の温水温度との関係を得て、これを関係式或いはテーブルにしてコントローラ８０に記憶させておくことで、温水給湯用熱交換器３１内の温水温度を推定して検出することができる。
実際の運転においては、風呂追い焚き循環路２０の循環流量は、循環復路２３の温度と循環往路２２の温度を測定することで、その時の燃焼熱量とから演算することができる。このため、循環往路２２にも循環往路温度センサ５８を設ける。前記循環流量の演算は、循環流量＝燃焼熱量×熱効率／（循環往路２２の温度−循環復路２３の温度）で演算することができる。なお、熱効率はそれぞれの条件で予め実験によって求めておいてもよいし、或いは代表的な値（例えば８０％＝０．８）を簡易的に用いてもよい。
【００２４】
図６に従って、風呂温度センサ５２の検出する温度と循環往路温度センサ５８の検出する温度と燃焼熱量とから温水給湯用熱交換器３１内の温水温度を推定検出して、湯張り弁７１を制御する例を説明する。
今、リモコン８１によって、風呂追い焚き運転スイッチがオンされると（ステップＳ２１でイエス）、コントローラ８０が循環ポンプ５４を駆動し、これによって水流スイッチ５１がオンすると、ガスバーナ１１の燃焼が開始され、風呂の追い焚き循環が開始される（ステップＳ２２）。コントローラ８０は風呂温度センサ５２により循環復路２３の温水温度を検出し、また循環往路温度センサ５８により循環往路２２の温水温度を検出する（ステップＳ２３）。そして得られた循環往路２２の検出温度と循環復路２３の検出温度と燃焼熱量とから、風呂追い焚き循環路２０を循環する温水の循環流量を演算する（ステップＳ２４）。更に前記循環復路２３の検出温度と前記演算された循環流量とバーナ１１の燃焼熱量とから、温水給湯用熱交換器３１内の温水温度を推定検出する（ステップＳ２５）。そして、得られた推定検出温度Ｔが予め定めた基準温度Ｔ_Ｓ以上になっていないかを監視し（ステップＳ２６）、以上になると（ステップＳ２６でイエス）、湯張り弁７１の制御を開始する（ステップＳ２７）。また前記基準温度Ｔ_Ｓ未満になると（ステップＳ２６でノー）、湯張り弁７１の制御を終了する（ステップＳ２８）。
【００２５】
温水給湯用熱交換器３１内の温水温度Ｔが基準温度Ｔ_Ｓ以上となった場合の湯張り弁７１の制御について述べる。
前記基準温度Ｔ_Ｓ以上となった場合の湯張り弁７１の制御は、その放出流量ができるだけ少なくて且つ温水給湯用熱交換器３１内の温水温度Ｔが基準温度Ｔ_Ｓを超えて高くならないように制御することを基本とする。具体的な方法の１つは、温水給湯用熱交換器３１内の温水温度が基準温度Ｔ_Ｓになるとまずコントローラ８０は予め定めた一定の最低水量を流し、これによって温水温度が基準温度Ｔ_Ｓ未満になれば流量を停止（ヒステリシスを考慮して基準温度Ｔ_Ｓよりも１乃至数度低い温度を流量停止温度としてもよい）し、一方、前記最低流量を流しても更に温水温度が上昇する場合は、その温度上昇にあわせて放出流量を増加させるようにする。この場合、放出流量の増加の程度は、例えば温水温度が基準温度Ｔ_Ｓを超えて１℃上昇する毎に流量を２倍にする等、温度上昇と流量上昇との関係を、前記基準温度Ｔ_Ｓを何度にするか及び前記最低水量をいくらに設定するかの決定と併せて、予め実験により決めることができる。
また別の方法として、温水温度が基準温度Ｔ_Ｓまで上昇した時点で、それ以上の温度上昇を確実に食い止めることができるようなある程度の放出流量をまず流し、これによって温度が低下すれば、低下した温度に応じて放出水量を低下させてゆき、基準温度Ｔ_Ｓよりも一定温度低い予め定めた温度になった時点で放出を停止するようにしてもよい。この場合においても、最初に温水温度が基準温度に達した際に流す流量やその後の温度変化による流量低減の程度、放出停止温度については予め実験により、その機種やその他の条件に応じた適当な値を決定することになる。
【００２６】
なお以上の説明は、制御弁として、流量調節を可能とした湯張り弁７１を用いた実施形態について説明したが、本願発明はこの実施形態に限定されるものではなく、前記湯張り弁７１を開閉弁とし、該湯張り弁７１を開放状態にして、過流出防止調整弁６６を制御することによっても同様の効果が得られる。この場合は給湯再出湯時の出湯温度特性は若干悪くなるが、湯張り弁を廉価に構成することが可能となる。
【００２７】
【発明の効果】
本発明は以上の構成、作用からなり、請求項１に記載の給湯機能付風呂釜装置によれば、風呂追い焚き用熱交換器と温水給湯用熱交換器とを１つのバーナで加熱するようにした１缶２回路式の給湯機能付風呂釜装置であって、前記温水給湯用熱交換器で熱交換加熱された温水を温水給湯回路の風呂自動給湯路を介して風呂追い焚き循環路に落とし込むことで浴槽への湯張りができるようにしたものにおいて、前記風呂自動給湯路に流量調節を可能とした制御弁を設け、一方、前記温水給湯用熱交換器内の温水温度を直接或いは間接的に検出する手段を設け、温水給湯用熱交換器内の温水温度が一定の基準温度以上の高温になると前記制御弁を流量調節可能に開放すると共に前記基準温度を超える温度の程度に応じて前記制御弁による排出流量を変更して温水給湯回路内の温水を浴槽側に排出するように構成したので、
風呂追い焚き運転を一時的に停止したり、バーナの燃焼入力を低下させたりすることなく、温水給湯用熱交換器内の温水温度が基準温度を超えて過熱状態の高温となったり、又これによって沸騰音を発したり、熱応力が発生するのを防止し、或いは軽減することができる。しかも流量調節可能な制御弁を用いることで、風呂追い焚き循環路から浴槽内に排出される排水量が必要以上に多くなるのを防止することが可能となる。また必要以上の排水を行わないように調節することが可能であるので、温水給湯用熱交換器によって必要以上に燃焼熱が奪われるのを防止して、より多くの燃焼熱が風呂追い焚き用熱交換器に加わるようにすることが可能となる。
特に、基準温度を超える温水給湯用熱交換器内の温水温度に応じた必要十分な排水がより確実に行え、温水給湯用熱交換器内の温水の過熱による不都合を十分に解消し、また浴槽への排水量をより必要最小限に抑え、加えて風呂追い焚き用熱交換器に加わる熱量の低下を一層好ましく抑制することができる。
また請求項２に記載の給湯機能付風呂釜装置によれば、上記請求項１に記載の構成による効果に加えて、温水給湯用熱交換器内の温水温度を直接検出する温度センサを設けたので、
温度センサにより温水給湯用熱交換器内の温水温度を直接検出することができ、浴槽給湯用熱交換器内の温水温度を正確に検出して、湯張り弁を駆動させることが可能となる。
また請求項３に記載の給湯機能付風呂釜装置によれば、上記請求項１に記載の構成による効果に加えて、温水給湯用熱交換器内の温水温度を、風呂追い焚き循環路の循環復路に設けられた風呂温度センサによる検出温度とバーナでの燃焼熱量とから推定するように構成したので、
温水給湯用熱交換器内の温水温度を検出するための温度センサを必要とすることなく、風呂温度センサによる検出温度とバーナでの燃焼熱量とによって温水給湯用熱交換器内の温水温度を推定して検出することができる。
また請求項４に記載の給湯機能付風呂釜装置によれば、上記請求項１に記載の構成による効果に加えて、温水給湯用熱交換器内の温水温度を、風呂追い焚き循環路の循環復路に設けられた風呂温度センサによる検出温度と風呂追い焚き循環路の循環往路に設けられた循環往路温度センサによる検出温度とバーナでの燃焼熱量とから推定するように構成したので、
循環復路の検出温度と循環往路の検出温度とから風呂追い焚き循環路の循環流量を得ることができ、この得られた循環流量と循環復路に設けられた温度センサによる検出温度とバーナの燃焼熱量とから温水給湯用熱交換器内の温水温度を推定して検出することができる。よって温水給湯用熱交換器内の温水温度を検出するための温度センサを必要とすることなく、且つ循環流量毎に温水給湯用熱交換器内の温水温度を推定することができ、より正確な温度推定と排水制御とが可能となる。
【図面の簡単な説明】
【図１】本発明の実施形態に係る給湯機能付風呂釜装置の概略構成図である。
【図２】本発明の実施形態の一例を示す湯張り弁による排水の制御フローチャートである。
【図３】温度センサによらずに温水給湯用熱交換器内の温水温度を推定する方法を説明する図である。
【図４】本発明の実施形態の他の一例を示す湯張り弁による排水の制御フローチャートである。
【図５】温度センサによらずに温水給湯用熱交換器内の温水温度を推定する他の方法を説明する図である。
【図６】本発明の実施形態の更に他の一例を示す湯張り弁による排水の制御フローチャートである。
【符号の説明】
１０缶体
１１ガスバーナ
２０風呂追い焚き循環路
２１風呂追い焚き用熱交換器
２２循環往路
２３循環復路
３０温水給湯回路
３１温水給湯用熱交換器
３２入水路
３３出湯路
３４一般給湯路
３５風呂自動給湯路
４０浴槽
５１水流スイッチ
５２風呂温度センサ
５３風呂水位センサ
５４循環ポンプ
５８循環往路温度センサ
６１入水流量センサ
６２入水温度センサ
６３熱交換器内温水温度センサ
６５出湯温度センサ
６９給湯温度センサ
７１湯張り弁
８０コントローラ
８１リモコン[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a hot water bath device with a hot water supply function, and more specifically, a one-bottle two-circuit hot water bath function with a hot water supply function in which a heat exchanger for reheating a bath and a heat exchanger for hot water hot water supply are heated by a single burner. About.
[0002]
[Prior art]
In a 1-can, 2-circuit type hot water bath with a hot water supply function that shares a burner, when a bath reheating operation is performed independently, the heat exchanger for hot water hot water placed in the same can body As a result, the temperature rises excessively, causing problems such as the generation of boiling noise and the generation of thermal stress. For this reason, conventionally, the temperature in the heat exchanger for hot water hot water supply is monitored, and when the temperature exceeds a certain temperature, the bath reheating operation is temporarily stopped or the burner combustion input is reduced. .
In addition, in the Japanese Patent Application Laid-Open No. 6-159801, the applicant of the present application is configured to drop a certain amount of time or a certain amount of water from the hot water hot water supply circuit into the bathtub through the passage when the temperature in the heat exchanger for hot water hot water supply exceeds a certain temperature. It provides a 1-can, 2-circuit hot-water bath device with a hot water supply function.
[0003]
[Problems to be solved by the invention]
However, in order to prevent the hot water temperature in the heat exchanger for hot water and hot water from rising excessively as in the past, the method of temporarily stopping the bath reheating operation or reducing the combustion input of the burner is reversed. However, there was a problem that the output of bathing was not enough.
In addition, when the hot water temperature in the heat exchanger for hot water hot water supply exceeds a certain temperature, a system that drains a fixed amount of time or a certain amount of water ensures that the hot water temperature in the heat exchanger for hot water hot water supply is below a predetermined temperature. Not always possible. Moreover, as a result of lowering the hot water temperature in the heat exchanger for hot water hot water supply more than necessary due to drainage, the heat amount of burner combustion is taken away, and the supply amount of combustion heat to the heat exchanger for bathing is lowered. Problems arise. Further, when a large amount of discharged water is set, there arises a problem that excessive water is discharged into the bathtub.
[0004]
Therefore, the present invention eliminates the drawbacks of the conventional hot water bath device with a hot water supply function and prevents the hot water in the hot water hot water supply heat exchanger from being overheated when the bath reheating operation is performed independently. In addition, the generation of boiling noise is alleviated, the thermal stress generated in the hot water hot water heat exchanger is alleviated, and the output in the bath reheating operation is reduced, and the reheating efficiency such as the delay in boiling is reduced. It is an object of the present invention to provide a hot water bath device with a hot water supply function that can reduce the amount of water and efficiently perform the bath chasing operation, and can prevent excessive drainage in the bathtub.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problems, a hot water supply function-equipped bath tub apparatus of the present invention is a one-can two-circuit hot water supply in which a heat exchanger for bathing and a heat exchanger for hot water hot water are heated by a single burner. A hot water bath device with a function, and the hot water heated and exchanged by the heat exchanger for hot water hot water supply is dropped into the bath recirculation circuit via the bath automatic hot water supply passage of the hot water hot water supply circuit, so A control valve capable of adjusting the flow rate is provided in the bath automatic hot water supply passage, while a means for directly or indirectly detecting the hot water temperature in the hot water hot water heat exchanger is provided. When the hot water temperature in the hot water supply heat exchanger becomes higher than a certain reference temperature, the control valve is opened so that the flow rate can be adjusted. And said Depending on the degree of temperature exceeding the reference temperature The first configuration is such that the discharge flow rate by the control valve is changed and the hot water in the hot water supply circuit is discharged to the bathtub side. It has the characteristics of
Also, the bath tub apparatus with a hot water supply function of the present invention is the above-mentioned first. 1's In addition to the features, a temperature sensor that directly detects the temperature of hot water in the heat exchanger for hot water supply is provided. Second It has the characteristics of
Also, the bath tub apparatus with a hot water supply function of the present invention is the above-mentioned first. 1's In addition to the features, the hot water temperature in the heat exchanger for hot water hot water supply is estimated from the temperature detected by the bath temperature sensor provided in the circulation return path of the bath recirculation circuit and the amount of combustion heat in the burner. The Third It has the characteristics of
Also, the bath tub apparatus with a hot water supply function of the present invention is the above-mentioned first. 1's In addition to the features, the temperature of the hot water in the heat exchanger for hot water supply is detected by the bath temperature sensor provided in the circulation return path of the bath recirculation circuit and the circulation path provided in the circulation path of the bath recirculation circuit It was configured to be estimated from the temperature detected by the temperature sensor and the amount of combustion heat in the burner. 4th It has the characteristics of
[0006]
According to the first feature, when the hot water temperature in the hot water hot water supply heat exchanger becomes equal to or higher than a certain reference temperature, the control valve whose flow rate can be adjusted is opened, and the hot water supply circuit passes through the control valve. The hot water inside is exhausted to the bath chase circuit. Therefore, the hot water in the hot water hot water supply heat exchanger is replaced by the drained flow rate and is prevented from being heated to an overheated state.
As for the reference temperature, for example, 90 ° C. or 95 ° C., an appropriate temperature is determined in advance by experiments to prevent overheating that may lead to boiling or thermal stress, and this is stored in the controller or the like. I will let you.
The control valve is not a simple on-off valve, but is capable of adjusting the flow rate so that the amount discharged to the bathtub side through the control valve is minimized and the hot water in the hot water hot water heat exchanger is overheated. It is also possible to adjust the discharge flow rate so that the state can be prevented.
As described above, according to the first feature, the hot water temperature in the hot water supply heat exchanger exceeds the reference temperature without temporarily stopping the bath reheating operation or reducing the combustion input of the burner. It is possible to prevent or reduce the occurrence of a high temperature in an overheated state, the generation of a boiling sound, and the generation of thermal stress. In addition, by using a control valve capable of adjusting the flow rate, it becomes possible to prevent the amount of drainage discharged from the bath recirculation circuit from being increased into the bathtub more than necessary. In addition, since it is possible to adjust so as not to drain more than necessary, it is possible to prevent more heat from being taken away by the heat exchanger for hot water hot water supply, so that more combustion heat can be used for reheating the bath. It becomes possible to add to the heat exchanger.
[0007]
In particular, according to the first feature, When the temperature in the heat exchanger for hot water supply becomes higher than the reference temperature, the control valve will be opened. The degree of opening may be set according to the degree of temperature exceeding the reference temperature. it can. That is, when the hot water temperature in the heat exchanger for hot water hot water supply is higher than the reference temperature, the degree of opening is increased to increase the discharge flow rate. The discharge flow rate will be reduced. This makes it possible to carry out with the minimum amount of drainage required to bring the hot water temperature in the heat exchanger for hot water hot water supply to a reference temperature or lower, and can appropriately reduce the amount discharged into the bathtub, It is possible to reduce the amount of heat taken away by the heat exchanger for hot water supply and to increase the amount of heat applied to the heat exchanger for bathing more effectively.
In the above, as a method of changing the discharge flow rate by the control valve in accordance with the degree of temperature exceeding the reference temperature, one or more temperatures exceeding the reference temperature are determined step by step, and each temperature is controlled step by step. The opening of the valve can be increased. Further, the opening degree of the control valve may be increased or decreased in a stepless proportion to the increase or decrease of the temperature exceeding the reference temperature. Of course, when the temperature rises and reaches the reference temperature, the control valve is opened. However, the control valve once opened may be closed at a constant temperature slightly lower than the reference temperature.
that's all, Especially the first feature According to the above, by changing the discharge flow rate by the control valve according to the degree of temperature exceeding the reference temperature, the necessary and sufficient drainage according to the hot water temperature in the heat exchanger for hot water hot water supply exceeding the reference temperature is more reliably ensured. It is possible to eliminate the inconvenience due to overheating of hot water in the heat exchanger for hot water hot water supply, to further minimize the amount of drainage to the bathtub, and to further reduce the amount of heat applied to the heat exchanger for bath reheating It can suppress preferably.
[0008]
Also above Second According to features 1's In addition to the operational effects of the features, a temperature sensor can be provided to directly detect the hot water temperature in the hot water hot water heat exchanger, accurately detecting the hot water temperature in the hot water heater for bath water control, Can be driven.
[0009]
Also above Third According to features 1's In addition to the operational effects of the features, the detection of the hot water temperature in the hot water hot water heat exchanger is estimated from the temperature detected by the temperature sensor provided in the circulation return path of the bath recirculation circuit and the combustion heat of the burner. Thus, a temperature sensor for detecting the hot water temperature in the heat exchanger for hot water supply is not required.
The detection of the hot water temperature in the heat exchanger for hot water hot water supply from the temperature detected by the temperature sensor provided in the circulation return path of the bath recirculation circuit and the combustion heat quantity of the burner is performed in advance by experiments. Obtain the relationship between the temperature of the circulation return path from the bathtub to the heat exchanger for bathing, the combustion heat quantity of the burner, and the hot water temperature in the heat exchanger for hot water hot water supply, for example, the circulation return path for each combustion heat quantity of the burner The relationship between the temperature of the water and the temperature of the hot water in the hot water hot water heat exchanger can be performed by storing it in a controller or the like with a relational expression or table.
[0010]
Also above 4th According to features 1's In addition to the operational effects of the features, detection of hot water temperature in the heat exchanger for hot water hot water supply is provided in the temperature detected by the temperature sensor provided in the circulation return path of the bath recirculation circuit and the circulation path of the bath recirculation circuit The temperature sensor for detecting the temperature of hot water in the heat exchanger for hot water hot water supply is not required because it is estimated from the temperature detected by the temperature sensor and the amount of combustion heat of the burner. In addition, the circulation flow rate of the bath recirculation circuit can be obtained from the detection temperature of the circulation return path and the detection temperature of the circulation outward path, and the hot water temperature in the hot water hot water supply heat exchanger can be estimated for each circulation flow rate. Accurate temperature estimation and drainage control are possible.
The bath recirculation is performed by a circulation pump installed in the bath recirculation circuit. Since the capacity of this circulation pump is not normally switched, the circulation flow rate is basically constant. The circulation flow rate may vary depending on the length of the valve. In the case of a circulation pump capable of switching the capacity, the circulation flow rate naturally varies depending on the switching. The hot water temperature in the heat exchanger for hot water supply differs depending on the circulation amount of the bath recirculation circuit even if the detected temperature and the combustion heat amount of the other circulation return passages are the same.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a hot water bath device with a hot water supply function according to an embodiment of the present invention, FIG. 2 is a flowchart of drainage control by a hot water valve showing an example of the embodiment of the present invention, and FIG. FIG. 4 is a diagram for explaining a method for estimating the hot water temperature in the heat exchanger for hot water hot water supply, FIG. 4 is a flow chart for controlling drainage by a hot water filling valve showing another example of the embodiment of the present invention, and FIG. It is a figure explaining the other method of estimating the warm water temperature in the heat exchanger for warm water hot water supply without using. FIG. 6 is a flowchart for controlling drainage by a hot water filling valve, showing still another example of the embodiment of the present invention.
[0012]
With reference to FIG. 1, the whole structure of the hot water bath apparatus with a hot-water supply function is demonstrated first.
Reference numeral 10 denotes a can body, in which combustion by the gas burner 11 is performed. The gas burner 11 may be another type of burner such as an oil burner. Air is supplied from the blower 12 for combustion of the burner 11.
In the upper part of the can 10, a bath-heating heat exchanger 21 of the bath-heating circuit 20 and a hot-water hot-water heat exchanger 31 of the hot-water hot water supply circuit 30 are arranged, and heat exchange between them. The vessels 21 and 31 are combined with one gas burner 11 and heated.
[0013]
The bath recirculation circuit 20 includes a recirculation path 22 that leads hot water from the can body 10 (bath reheating heat exchanger 21) to the bathtub 40 in addition to the bath reheating heat exchanger 21, and It comprises a circulation return path 23 that guides hot water to the can 10 (bath reheating heat exchanger 21). The circulation forward path 22 and the circulation return path 23 are connected to the bathtub 40 via a circulation fitting 41.
In the circulation return path 23, a water flow switch 51, a bath temperature sensor 52, a bath water level sensor 53, and a circulation pump 54 are provided.
In addition, 55 is a bypass which short-circuits the circulation outward path 22 and the circulation return path 23, 56 is a three-way switching valve, 57 is a drain plug.
[0014]
The hot water hot water supply circuit 30 includes, in addition to the heat exchanger 31 for hot water hot water supply, a water inlet 32 for guiding water from a water supply such as a water supply to the can body 10 (heat exchanger 31 for hot water hot water supply), and the can body 10 (hot water hot water supply). A hot water supply passage 33 for hot water heated by the heat exchanger 31), a general hot water supply passage 34 branched from the hot water supply passage 33, and an automatic bath hot water supply passage 35.
The water inlet 32 is provided with an incoming water flow sensor 61 and an incoming water temperature sensor 62.
The heat exchanger 31 for hot water supply is provided with a heat exchanger temperature sensor 63 for detecting the temperature of the hot water in the exchanger 31. 64 is an after-fire safety device. Further, a hot water temperature sensor 65 and an excessive outflow prevention adjusting valve 66 are provided in the hot water passage 33.
Reference numeral 67 denotes a bypass between the water inlet 32 and the hot water outlet 33, and a bypass flow rate adjusting valve 68 is provided. A hot water supply temperature sensor 69 is provided downstream of the joining point of the bypass 67 to the hot water supply passage 33.
[0015]
In the middle of the bath automatic hot water supply passage 35, a hot water filling valve 71 which is a control valve capable of adjusting the flow rate is provided. A drop flow detection sensor 72 and a backflow prevention valve 73 are provided downstream thereof. Reference numeral 74 denotes a vacuum breaker.
[0016]
Reference numeral 80 is a controller of the apparatus, and 81 is a remote controller. The remote controller 81 may include a plurality of remote controllers such as a remote controller for bath operation and a remote controller for hot water supply operation. The controller 80 inputs information from sensors provided in each part of the apparatus, receives a command from the remote controller 81, and commands a predetermined operation command to each part of the apparatus by built-in software.
[0017]
Now, in the state where the main operation switch of the apparatus is turned on, when the bath rebirth operation is commanded by the remote controller 81, the controller 80 first drives the circulation pump 54. And if the water flow switch 51 detects more than the minimum amount of working water by this, combustion of the gas burner 11 will be started. The bath water circulates in the can body 10 and is heated in the heat exchanger 21 for reheating the bath, so that the reheating of the bath is performed. When the bath temperature sensor 52 detects a predetermined bath set temperature, the operation is terminated.
In addition, when the main hot water supply passage 34 is opened while the main operation switch of the apparatus is turned on, water is supplied through the water inlet 32 and the incoming water flow rate sensor 61 detects that the minimum operating water amount is exceeded. Then, the controller 80 burns the gas burner 11. The hot water discharged is supplied from the hot water supply passage 33 through the general hot water supply passage 34 to the general hot water supply.
Further, in the state where the main operation switch of the apparatus is turned on, when a remote bath 81 commands the automatic bath drop operation, the controller 80 opens the hot water filling valve 71 at a full opening or a constant opening. As a result, when the incoming water flow sensor 61 detects the amount of minimum working water or more, the gas burner 11 is combusted, and the hot water discharged from the hot water passes through the automatic hot water supply passage 35 from the hot water supply passage 33 and enters the bath recirculation circulation passage 20, and further the circulation forward passage. 22 and the circulation return path 23 are dropped into the bathtub 40. When the set flow rate is dropped and the flow rate detection sensor 72 detects it, the operation is terminated.
[0018]
In the apparatus mechanism and function as described above, when the bath reheating operation is performed alone, the water is heated in a stopped state without a water flow in the heat exchanger 31 for hot water and hot water that is not operated. For this reason, the hot water temperature may be raised to a very hot overheated state. Moreover, the hot water temperature in the hot water hot water supply heat exchanger 31 may be raised to a very high temperature due to a post-boiling phenomenon that occurs after the hot water hot water supply operation is stopped. In addition, the hot water temperature in the hot water hot water supply heat exchanger 31 may be raised to a high temperature due to other unexpected matters.
If the temperature of the hot water in the hot water hot water supply heat exchanger 31 continues to rise, it will eventually become overheated, resulting in the generation of boiling noise due to boiling and the generation of thermal stress.
[0019]
Therefore, in order to prevent inconvenience due to the hot water in the hot water hot water supply heat exchanger 31 becoming overheated, a means for directly or indirectly detecting the temperature in the hot water hot water supply heat exchanger 31 is provided. When the temperature in the hot water hot water supply heat exchanger 31 becomes equal to or higher than a certain reference temperature, the hot water filling valve 71 is opened so that the flow rate can be adjusted, and the hot water in the hot water hot water supply circuit is minimized. The hot water temperature in the heat exchanger for hot water hot water supply does not exceed the reference temperature.
[0020]
With reference to FIG. 2, the control of the drainage by the hot water filling valve 71 when the hot water temperature in the hot water hot water supply heat exchanger 31 is directly detected by using the hot water temperature sensor 63 in the heat exchanger will be described.
Now, when the bath reheating operation switch is turned on by the remote controller 81 (Yes in step S1), the controller 80 drives the circulation pump 54. When the water flow switch 51 is turned on, the combustion of the gas burner 11 is started. The bath circulation cycle is started (step S2). The controller 80 detects the hot water temperature in the heat exchanger 31 for hot water supply using the hot water temperature sensor 63 in the heat exchange (step S3), and the detected temperature T is a predetermined reference temperature T. _S Whether or not it is above is monitored (Step S4), and when it is above (Yes in Step S4), the control of the hot water filling valve 71 is started (Step S5). The reference temperature T _S If it is less (No in step S4), the control of the hot water filling valve 71 is terminated (step S5).
A method of controlling the hot water filling valve 71 will be described later.
[0021]
Next, a method of estimating and detecting the temperature of the hot water in the hot water hot water supply heat exchanger 31 without or using the heat exchange internal hot water temperature sensor 63 will be described with reference to FIG. In the case of one can two-circuit type, the rise in the temperature of the hot water in the heat exchanger 31 for hot water supply when the bath reheating operation is performed alone is the temperature of the circulation return path 23 and the circulation flow rate of the bath reheating circulation path 20. It is influenced by three factors of the combustion heat quantity by the burner 11. That is, when the temperature of the circulation return path 23 increases, the temperature of the hot water in the hot water hot water supply heat exchanger 31 increases. In addition, the smaller the circulating flow rate, the higher the temperature of the hot water in the hot water hot water supply heat exchanger 31.
Now, assuming that the circulation flow rate by the circulation pump 54 is constant, the relationship between the temperature of the circulation return path 23 and the hot water temperature in the hot water hot water supply heat exchanger 31 when the bath reheating operation is performed with a certain amount of combustion heat, The relationship is as shown in FIG. That is, the temperature of the circulation return path 23 rises with the passage of time, and the temperature reaches a certain constant temperature T. ₁ Then, the hot water temperature in the hot water supply heat exchanger 31 is the reference temperature T. _S become.
Accordingly, in an apparatus in which the circulation flow rate in the bath reheating operation is actually constant or can be considered to be constant, the circulation return path 23 of each combustion heat amount at the constant circulation flow rate is experimentally determined in advance. By obtaining the relationship between the temperature (temperature detected by the bath temperature sensor 52) and the hot water temperature in the hot water hot water heat exchanger 31, this is stored in the controller 80 as a relational expression or a table. The hot water temperature in the industrial heat exchanger 31 can be estimated and detected.
[0022]
An example in which the hot water temperature in the hot water hot water supply heat exchanger 31 is estimated and detected from the temperature detected by the bath temperature sensor 52 and the amount of combustion heat and the hot water valve 71 is controlled will be described with reference to FIG.
Now, when the bath reheating operation switch is turned on by the remote controller 81 (Yes in step S11), the controller 80 drives the circulation pump 54. When the water flow switch 51 is turned on, the combustion of the gas burner 11 is started. The bath circulation cycle is started (step S12). The controller 80 detects the hot water temperature of the circulation return path 23 by the bath temperature sensor 52 (step S13), and further, from the detected temperature and the combustion heat amount of the burner 11 in which combustion is performed, The hot water temperature is estimated and detected (step S14). The obtained estimated detection temperature T is a predetermined reference temperature T. _S It is monitored whether it is above (step S15), and when it becomes above (Yes in step S15), the control of the hot water filling valve 71 is started (step S16). The reference temperature T _S If it becomes less (No in Step S15), the control of the hot water filling valve 71 is terminated (Step S17).
[0023]
Next, another method for estimating and detecting the hot water temperature in the hot water supply heat exchanger 31 without or using the heat exchange hot water temperature sensor 63 will be described with reference to FIG.
In the method shown in FIG. 3, the hot water temperature in the hot water supply heat exchanger 31 is estimated on the assumption that the circulation flow rate in the bath reheating operation is constant, but in this example, the bath recirculation circuit 20 is used. The hot water temperature in the hot water hot water supply heat exchanger 31 is estimated in consideration of the circulation flow rate flowing through the hot water supply. Since the degree of increase in the temperature of the hot water in the hot water supply heat exchanger 31 varies depending on the circulation flow rate flowing through the bath recirculation circuit 20, this method is a circulation flow rate of the bath recirculation circuit 20 as a bath pot device. This is effective for a switch that can be switched, or for a pipe whose circulation path 20 is changed and the circulation flow rate is unknown.
Now, the temperature of the circulation return path 23 and the hot water in the hot water hot water supply heat exchanger 31 when the bath reheating operation is performed with a certain amount of combustion heat at each of the different circulation flows A, B, for example. The relationship with temperature is as shown in FIG. That is, a temperature rise curve that differs for each circulation flow rate is shown, and each temperature is a constant temperature T. _A , T _B Then, the hot water temperature in the hot water supply heat exchanger 31 is the reference temperature T. _S become. Therefore, for various circulation flow rates obtained in advance by experiments, the relationship between the temperature of the circulation return path 23 (temperature detected by the bath temperature sensor 52) and the hot water temperature in the hot water hot water supply heat exchanger 31 is obtained for each amount of combustion heat. By storing this as a relational expression or a table in the controller 80, the hot water temperature in the hot water hot water supply heat exchanger 31 can be estimated and detected.
In actual operation, the circulation flow rate of the bath recirculation circuit 20 can be calculated from the amount of combustion heat at that time by measuring the temperature of the circulation return path 23 and the temperature of the circulation forward path 22. For this reason, the circulation outward path temperature sensor 58 is also provided in the circulation outward path 22. The circulation flow rate can be calculated by circulation flow rate = combustion heat amount × thermal efficiency / (temperature of circulation forward path 22−temperature of circulation return path 23). The thermal efficiency may be obtained in advance by experiment under each condition, or a representative value (for example, 80% = 0.8) may be simply used.
[0024]
According to FIG. 6, the hot water temperature in the hot water hot water supply heat exchanger 31 is estimated and detected from the temperature detected by the bath temperature sensor 52, the temperature detected by the circulation outward temperature sensor 58, and the amount of combustion heat, and the hot water valve 71 is controlled. An example will be described.
Now, when the bath reheating operation switch is turned on by the remote controller 81 (Yes in step S21), the controller 80 drives the circulation pump 54. When the water flow switch 51 is turned on, the combustion of the gas burner 11 is started. The bath circulation circulation is started (step S22). The controller 80 detects the hot water temperature in the circulation return path 23 using the bath temperature sensor 52, and detects the hot water temperature in the circulation return path 22 using the circulation outward path temperature sensor 58 (step S23). Then, the circulation flow rate of the hot water circulating in the bath recirculation circuit 20 is calculated from the detected temperature of the circulation forward path 22, the detection temperature of the circulation return path 23, and the amount of combustion heat (step S24). Furthermore, the hot water temperature in the hot water hot water supply heat exchanger 31 is estimated and detected from the detected temperature of the circulation return path 23, the calculated circulation flow rate, and the amount of combustion heat of the burner 11 (step S25). The obtained estimated detection temperature T is a predetermined reference temperature T. _S It is monitored whether it is above (step S26), and if it is above (yes in step S26), control of the hot water filling valve 71 is started (step S27). The reference temperature T _S If it is less (No in step S26), the control of the hot water filling valve 71 is terminated (step S28).
[0025]
The hot water temperature T in the hot water supply heat exchanger 31 is the reference temperature T. _S The control of the hot water filling valve 71 in the case described above will be described.
Reference temperature T _S The hot water filling valve 71 is controlled when the discharge flow rate is as small as possible and the hot water temperature T in the hot water supply heat exchanger 31 is the reference temperature T. _S Basically, it should be controlled so that it does not become higher than One specific method is that the temperature of the hot water in the hot water hot water supply heat exchanger 31 is the reference temperature T. _S At first, the controller 80 causes a predetermined minimum amount of water to flow, so that the hot water temperature is changed to the reference temperature T. _S The flow rate is stopped when the temperature is less than (reference temperature T in consideration of hysteresis) _S If the hot water temperature rises even when the minimum flow rate is passed, the discharge flow rate is increased in accordance with the temperature rise. . In this case, the degree of increase in the discharge flow rate is, for example, that the hot water temperature is the reference temperature T _S The relationship between the temperature rise and the flow rate rise, such as doubling the flow rate every time the temperature rises by 1 ° C. exceeds the reference temperature T _S In addition to the determination of how many times the minimum water amount is to be set and how much the minimum water amount is set, it can be determined in advance by experiments.
As another method, the hot water temperature is the reference temperature T. _S When the temperature rises to a certain level, a certain amount of discharge flow that can reliably stop further temperature rise is first flowed, and if this causes the temperature to drop, the amount of discharged water will be reduced according to the reduced temperature, Reference temperature T _S The discharge may be stopped when a predetermined temperature lower than the predetermined temperature is reached. Even in this case, the flow rate when the hot water temperature reaches the reference temperature for the first time, the degree of flow rate reduction due to the subsequent temperature change, and the release stop temperature are determined in advance according to the model and other conditions by experiments. The value will be determined.
[0026]
In the above description, the embodiment using the hot water filling valve 71 that enables flow rate adjustment as the control valve has been described. However, the present invention is not limited to this embodiment. The same effect can be obtained by using an on-off valve and controlling the overflow prevention adjusting valve 66 with the hot water filling valve 71 opened. In this case, the hot water temperature characteristic at the time of hot water supply and re-watering is slightly deteriorated, but the hot water filling valve can be constructed at low cost.
[0027]
【The invention's effect】
The present invention has the above-described configuration and action, and according to the hot water supply-equipped bath tub apparatus according to claim 1, the bath reheating heat exchanger and the hot water hot water supply heat exchanger are heated by one burner. 1 can / two-circuit type hot water bath device with a hot water supply function, wherein the hot water heated and exchanged by the heat exchanger for hot water hot water supply is recirculated through a bath automatic hot water supply passage in the hot water hot water supply circuit In the hot water supply to the bathtub, the hot water supply path in the hot water hot water supply heat exchanger can be adjusted directly or indirectly. If the temperature of the hot water in the hot water hot water supply heat exchanger exceeds a certain reference temperature, the control valve is opened so that the flow rate can be adjusted. And changing the discharge flow rate by the control valve according to the degree of temperature exceeding the reference temperature. Since it was configured to discharge the hot water in the hot water hot water supply circuit to the bathtub side,
The hot water temperature in the heat exchanger for hot water hot water supply exceeds the reference temperature and becomes overheated without temporarily stopping the bath chasing operation or reducing the combustion input of the burner. Can prevent or reduce the occurrence of boiling noise and the generation of thermal stress. In addition, by using a control valve capable of adjusting the flow rate, it becomes possible to prevent the amount of drainage discharged from the bath recirculation circuit from being increased into the bathtub more than necessary. In addition, since it is possible to adjust so as not to drain more than necessary, it is possible to prevent more heat from being taken away by the heat exchanger for hot water hot water supply, so that more combustion heat can be used for reheating the bath. It becomes possible to add to the heat exchanger.
In particular, Necessary and sufficient drainage according to the hot water temperature in the heat exchanger for hot water hot water supply exceeding the reference temperature can be performed more reliably, and the inconvenience due to overheating of hot water in the heat exchanger for hot water hot water supply can be sufficiently eliminated, and The amount of drainage can be further reduced to the minimum necessary, and in addition, a decrease in the amount of heat applied to the bath-heating heat exchanger can be more preferably suppressed.
Also Claim 2 According to the hot water bath device with hot water supply function described in claim 1 In addition to the effects of the described configuration, a temperature sensor that directly detects the temperature of the hot water in the heat exchanger for hot water hot water supply is provided.
The temperature sensor can directly detect the hot water temperature in the hot water hot water heat exchanger, and can accurately detect the hot water temperature in the bathtub hot water heat exchanger to drive the hot water filling valve.
Also Claim 3 According to the hot water bath device with hot water supply function described in claim 1 In addition to the effects of the described configuration, the hot water temperature in the hot water hot water heat exchanger is estimated from the temperature detected by the bath temperature sensor provided in the circulation return path of the bath recirculation circuit and the amount of combustion heat in the burner. Because it was configured to
Without the need for a temperature sensor to detect the temperature of the hot water in the hot water supply heat exchanger, the temperature of the hot water in the hot water supply heat exchanger is estimated from the temperature detected by the bath temperature sensor and the amount of combustion heat in the burner. Can be detected.
Also Claim 4 According to the hot water bath device with hot water supply function described in claim 1 In addition to the effects of the configuration described above, the temperature of the hot water in the heat exchanger for hot water supply is provided in the temperature detected by the bath temperature sensor provided in the circulation return path of the bath recirculation circuit and in the circulation path of the bath recirculation circuit Because it was configured to estimate from the temperature detected by the circulating circulating path temperature sensor and the amount of combustion heat in the burner,
The circulation flow rate of the bath recirculation circuit can be obtained from the detection temperature of the circulation return path and the detection temperature of the circulation return path, and the obtained circulation flow rate, the temperature detected by the temperature sensor provided in the circulation return path, and the combustion heat amount of the burner Thus, the hot water temperature in the heat exchanger for hot water supply can be estimated and detected. Therefore, it is possible to estimate the hot water temperature in the hot water hot water supply heat exchanger for each circulation flow rate without requiring a temperature sensor for detecting the hot water temperature in the hot water hot water heat exchanger, and more accurate. Temperature estimation and drainage control are possible.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a hot water tank device with a hot water supply function according to an embodiment of the present invention.
FIG. 2 is a flowchart for controlling drainage by a hot water valve according to an embodiment of the present invention.
FIG. 3 is a diagram for explaining a method for estimating a hot water temperature in a heat exchanger for hot water supply without using a temperature sensor.
FIG. 4 is a flowchart of drainage control by a hot water filling valve according to another example of the embodiment of the present invention.
FIG. 5 is a diagram for explaining another method for estimating the temperature of hot water in the hot water hot water supply heat exchanger without using a temperature sensor.
FIG. 6 is a flowchart for controlling drainage by a hot water filling valve according to still another example of the embodiment of the present invention.
[Explanation of symbols]
10 can body
11 Gas burner
20 Bath chasing circuit
21 Heat exchanger for bathing
22 Circulation path
23 Circulation Return
30 Hot water hot water supply circuit
31 Heat exchanger for hot water supply
32 waterway
33 Hot Spring
34 General hot water supply path
35 Bath hot water supply path
40 bathtub
51 Water flow switch
52 Bath temperature sensor
53 Bath water level sensor
54 Circulation pump
58 Circulating forward temperature sensor
61 Incoming water flow sensor
62 Water temperature sensor
63 Hot water temperature sensor in heat exchanger
65 Hot water temperature sensor
69 Hot water temperature sensor
71 Hot water filling valve
80 controller
81 remote control

Claims

A one-bottle, two-circuit type hot water supply bath apparatus with a hot water supply function in which a heat exchanger for reheating a bath and a heat exchanger for hot water hot water supply are heated by a single burner. It is possible to adjust the flow rate to the bath automatic hot water supply path by replacing the heated hot water into the bath recirculation circuit through the automatic hot water supply path of the hot water hot water supply circuit. On the other hand, a means for directly or indirectly detecting the hot water temperature in the hot water hot water supply heat exchanger is provided, and the hot water temperature in the hot water hot water heat exchanger is higher than a certain reference temperature. Then, the control valve is opened so that the flow rate can be adjusted, and the discharge flow rate by the control valve is changed according to the degree of temperature exceeding the reference temperature, and the hot water in the hot water hot water supply circuit is discharged to the bathtub side. It is characterized by Hot water function with bathtub apparatus.

The bath tub device with a hot water supply function according to claim 1, further comprising a temperature sensor that directly detects the temperature of the hot water in the heat exchanger for hot water supply .

The hot water temperature in the heat exchanger for hot water hot water supply is configured to be estimated from a temperature detected by a bath temperature sensor provided in a circulation return path of the bath recirculation circuit and a combustion heat amount in the burner . Bath pot device with hot water supply function.

The temperature of hot water in the hot water supply heat exchanger is detected by the bath temperature sensor provided in the circulation return path of the bath recirculation circuit and the temperature detected by the circulation outward temperature sensor provided in the circulation recirculation path of the bath recirculation circuit The bath apparatus with a hot water supply function according to claim 1, which is configured to be estimated from the amount of combustion heat in the burner .