JP3798134B2

JP3798134B2 - One can two water heater

Info

Publication number: JP3798134B2
Application number: JP33776597A
Authority: JP
Inventors: 徹哉佐藤; 幸伸野口; 寿久斉藤
Original assignee: 株式会社ガスター
Priority date: 1997-11-21
Filing date: 1997-11-21
Publication date: 2006-07-19
Anticipated expiration: 2017-11-21
Also published as: JPH11153352A

Description

【０００１】
【発明の属する技術分野】
本発明は、給湯熱交換器と追い焚き熱交換器等の非給湯側熱交換器が一体化され、その一体化した熱交換器を共通のバーナーで加熱する一缶二水路給湯器に関するものである。
【０００２】
【従来の技術】
図１０には本出願人らが開発している一缶二水路給湯器である一缶二水路風呂給湯器のシステム構成例が示されている。同図において、この一缶二水路風呂給湯器（器具）は燃焼室１を有し、この燃焼室１にはバーナー２が配設され、このバーナー２の上方には給湯熱交換器３と非給湯側熱交換器としての追い焚き熱交換器４が設けられている。これら給湯熱交換器３と追い焚き熱交換器４は一体化されて配設されている。すなわち、複数の共通のフィンプレート５に給湯側の管路を貫通装着して給湯熱交換器３と成し、同じくフィンプレート５に追い焚き側の管路を貫通装着して追い焚き熱交換器４と成しており、上記バーナー２は給湯熱交換器３と追い焚き熱交換器４を共に加熱する構成になっている。
【０００３】
上記バーナー２の下方側の燃焼室１は給気通路６に連通され、この給気通路６には燃焼ファン７が組み込まれており、燃焼ファン７の回転駆動により外部から給気通路６を介してバーナー２へ空気が送り込まれると共に、バーナー２の燃焼により生じた排気ガスがバーナー２の上方の燃焼室１に連通する排気通路９から外部へ排出される。
【０００４】
上記バーナー２のガス導入口にはガスノズル１９が対向配設され、このガスノズル１９には燃料ガスを導入するためのガス供給通路８が接続されており、このガス供給通路８により導かれた燃料ガスはガスノズル１９を介してバーナー２に供給される。また、上記ガス供給通路８には通路の開閉を行う電磁弁１０，１１ａ，１１ｂと、ガスの供給量を開弁量により制御する比例弁１２とが介設されている。
【０００５】
前記給湯熱交換器３の入側には給水通路１３の一端側が接続され、給湯熱交換器３の出側には給湯通路１４の一端側が接続されており、上記給水通路１３の他端側は外部配管を介して水供給源に接続され、前記給湯通路１４の他端側は外部配管を介して台所等の所望の給湯場所に導かれている。また、上記給湯熱交換器３の入側の給水通路１３と出側の給湯通路１４を短絡するバイパス通路１５が設けられており、上記バイパス通路１５には通路の開閉を行うバイパス弁１６が介設されている。
【０００６】
前記追い焚き熱交換器４の入側には管路１８の一端側が接続され、この管路１８の他端側は循環ポンプ２０の吐出口に接続されており、循環ポンプ２０の吸入口には戻り管２１の一端側が接続され、戻り管２１の他端側は浴槽２２に連接されている。また、追い焚き熱交換器４の出側には管路２３の一端側が接続されており、この管路２３の他端側は前記浴槽２２に連接されている。上記戻り管２１と循環ポンプ２０と管路１８と追い焚き熱交換器４と管路２３により非給湯側循環通路としての追い焚き循環通路２４が構成される。
【０００７】
上記追い焚き循環通路２４の管路１８と前記給湯通路１４は湯張り通路２５により連通されており、この湯張り通路２５には通路の開閉を制御する注湯制御弁２６と、浴槽２２の水位を検出する水位センサ２８とが設けられている。
【０００８】
なお、図中に示す３０は燃焼室１内の風量を検出する風量センサであり、３１は給水通路１３に設けられて給水の流量を検出する水量センサであり、３２は給水通路１３の水の温度を検出する入水温度センサであり、３４は給湯通路１４に設けられて通水流量を制御する流量制御弁であり、３５は給湯通路１４に設けられて給湯が行われていることを水流により検出する給湯確認スイッチであり、３６は追い焚き循環通路２４の水流の有無を検出する流水スイッチであり、３７は追い焚き循環通路２４の湯水温を浴槽湯水の温度（風呂温度）として検出する非給湯側循環通路温度検出手段である風呂温度センサであり、３８は給湯熱交換器３で作り出された湯の温度を検出する出湯温度センサである。
【０００９】
この一缶二水路風呂給湯器には制御装置４０が設けられており、この制御装置４０にはリモコン４１が接続されている。このリモコン４１には給湯温度を設定するための給湯温度設定手段や、浴槽２２の風呂の温度を設定する風呂温度設定手段や、浴槽２２の湯水の水位を設定する風呂水位設定手段等が設けられている。
【００１０】
上記制御装置４０は各種センサのセンサ出力信号やリモコン４１の情報を取り込み、それら情報と予め与えられているシーケンスプログラムに従って、給湯運転や、湯張り運転や、追い焚き運転等の各種の器具運転の動作を次のように制御する。
【００１１】
例えば、台所等に導かれた給湯通路の水栓が開けられ、水供給源から給水通路１３に水が流れ込んで水量センサ３１が給水通路１３の通水を検出すると、器具は給湯運転を開始する。まず、燃焼ファン７の回転駆動を開始させ、電磁弁１１ａ，１１ｂの両方又はどちらか一方と電磁弁１０を開動作させガス供給通路８を通してバーナー２に燃料ガスを供給し、図示されていない点着火手段によりバーナー２の点着火を行い燃焼を開始させる。
【００１２】
そして、給湯湯温が前記給湯温度設定手段に設定されている給湯設定温度となるように比例弁１２の開弁量を制御して（バーナー２への供給ガス量を制御して）バーナー２の燃焼能力を制御し、給湯熱交換器３の通水をバーナー２の燃焼火炎により加熱して設定温度の湯を作り出し、この湯を給湯通路１４を通して給湯場所に供給する。
【００１３】
湯の使用が終了して水栓が閉められると、給湯熱交換器３への通水が停止し、水量センサ３１が給水通路１３の通水を検知しなくなったときに、電磁弁１０を閉じてバーナー２の燃焼を停止させる。その後、予め定められたポストパージ期間（例えば、５分間）が経過したときに、燃焼ファン７の回転駆動を停止して給湯運転を終了し次の給湯に備える。
【００１４】
湯張り運転を行うときには、例えば、注湯制御弁２６を開弁し、この注湯制御弁２６の開弁動作により水供給源から給水通路１３に水が流れ込んで水量センサ３１が給水通路１３の通水を検知すると、上記給湯運転と同様にバーナー２の燃焼を開始させる。
【００１５】
このバーナー２の燃焼火炎により給湯熱交換器３で作り出された湯は給湯通路１４と湯張り通路２５を順に介して追い焚き循環通路２４に送り込まれ、追い焚き循環通路２４に流れ込んだ湯は戻り管２１を通る経路と追い焚き熱交換器４を通る経路との２経路で浴槽２２に落とし込まれる。そして、水位センサ２８が検出する浴槽２２の水位がリモコン４１に設定されている設定水位に達したときに、注湯制御弁２６を閉じ、電磁弁１０を閉じてバーナー２の燃焼を停止させ、湯張り運転を終了する。
【００１６】
追い焚き運転を行うときには、循環ポンプ２０を駆動させて浴槽２２内の湯水を追い焚き循環通路２４を通して循環させ、この湯水の流れを流水スイッチ３６により検知した後、バーナー２の燃焼を開始させ、バーナー２の燃焼火炎により追い焚き熱交換器４の循環湯水を加熱して追い焚きを行う。そして、風呂温度センサ３７により検出される風呂温度が前記風呂温度設定手段により設定されている設定温度に達したときに、バーナー２の燃焼を停止させ、追い焚き運転を終了する。
【００１７】
前記の如く、一缶二水路風呂給湯器は、一体化された給湯熱交換器３と追い焚き熱交換器４を共通のバーナー２を用いて加熱する方式であるので、別体に設けられた給湯熱交換器と追い焚き熱交換器をそれぞれ別個のバーナーを用いて燃焼加熱する方式に比べて、装置構成の簡易化が図れ、これに伴い、装置の小型化とコストの低減が図れることになる。
【００１８】
また、図１１には、一缶二水路給湯器としての給湯暖房機の一例が示されており、同図において、図１０の一缶二水路風呂給湯器と同一名称部分には同一符号が付してある。また、図中、５７は非給湯側熱交換器としての暖房用熱交換器を示しており、５２は暖房オン・オフバルブ、５３は放熱器、５４はファン、５５はシスターンタンク、５６はバイパス通路をそれぞれ示している。暖房用循環通路５１を循環する熱媒体としては、例えば、エチレングリコールとプロピレングリコールに水を加えたものが用いられる。
【００１９】
【発明が解決しようとする課題】
ところで、従来は、前記の如く、追い焚き運転を行うときには、循環ポンプ２０の駆動により浴槽２２内の湯水を追い焚き循環通路２４を通して循環させて、この湯水の流れを流水スイッチ３６によって検知した後、バーナー２の燃焼を開始させているが、追い焚き循環通路２４を通る浴槽湯水には髪等のゴミが多く含まれており、流水スイッチ３６に髪等のゴミが絡み付き、故障することがよくあるために、できれば流水スイッチ３６を用いずに追い焚き循環通路２４の湯水の流れを検知したいといった要求があった。
【００２０】
また、上記のような一缶二水路タイプの風呂給湯器においては、例えば、追い焚き熱交換器４側と給湯熱交換器３側の吸熱比率に基づいて、給湯と風呂の追い焚きの同時燃焼時の燃焼制御が行われるために、追い焚き循環通路２４を通る湯水の循環流量を検出したいといった要求があり、追い焚き循環通路２４の湯水循環流量をボール式水量センサにより測定する方法等が以前に提案されているが、このようなセンサは、前記流水スイッチ３６と同様に、浴槽湯水中のゴミが絡み付くと故障し易く、測定される浴槽湯水の循環流量が不正確な値になりがちであった。
【００２１】
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、追い焚き循環通路の湯水の流れの有無、および循環流量を正確に検出することができる一缶二水路風呂給湯器を提供し、さらには、非給湯側循環通路の熱媒体の流れの有無、及び循環流量を正確に検出することができる一缶二水路給湯器を提供することにある。
【００２２】
【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をもって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、給水通路から導かれた水を加熱し給湯通路に湯を供給する給湯熱交換器と、循環ポンプを備えた非給湯側循環通路に組み込まれ該非給湯側循環通路を循環する熱媒体を加熱する非給湯側熱交換器とを有し、上記給湯熱交換器と非給湯側熱交換器は一体化され、上記給湯熱交換器と非給湯側熱交換器を共通に加熱するバーナーが設けられている一缶二水路給湯器において、給湯熱交換器の湯温を検出する給湯熱交換器湯温検出手段と、上記非給湯側循環通路の流れ有無判断の検出モードの動作時に上記バーナーを試験的に燃焼させて上記給湯熱交換器湯温検出手段の検出温度が予め定められた温度に達したときにバーナー燃焼を停止させるとともに該バーナー燃焼の停止以降に上記循環ポンプを駆動させる試験用バーナー・ポンプ制御部とを設け、給湯熱交換器湯温の変化形態に基づいて非給湯側循環通路の熱媒体の流れの有無の判断を行うための非給湯側流れ有無判断用データを予め与え、該非給湯側流れ有無判断用データと上記試験用バーナー・ポンプ制御部による循環ポンプの駆動以降に検出される上記給湯熱交換器湯温検出手段の検出温度データとに基づいて上記非給湯側循環通路の熱媒体の流れの有無を判断する非給湯側循環通路流れ判断部を設けた構成をもって課題を解決するための手段としている。
【００２３】
また、上記非給湯側流れ有無判断用データは試験用バーナー・ポンプ制御部によるバーナー燃焼停止以降の給湯熱交換器の湯温立ち下がり勾配によって与えられ、非給湯側循環通路流れ判断部はこの湯温立ち下がり勾配を基準勾配として該基準勾配と上記バーナー燃焼停止以降の給湯熱交換器湯温検出手段の検出温度データの湯温立ち下がり勾配とを比較して該検出温度データの湯温立ち下がり勾配が上記基準勾配よりも小さいときには非給湯側循環通路の熱媒体の流れがないと判断し、上記検出温度データの湯温立ち下がり勾配が上記基準勾配以上のときには非給湯側循環通路の熱媒体の流れがあると判断することも上記本第１の発明の特徴的な構成とされている。
【００２４】
さらに、上記非給湯側流れ有無判断用データは試験用バーナー・ポンプ制御部が循環ポンプを駆動させてから予め定められた基準時間が経過したときの給湯熱交換器の湯温によって与えられ、非給湯側循環通路流れ判断部はこの給湯熱交換器の湯温を判断基準湯温として該判断基準湯温と上記循環ポンプを駆動させてから上記基準時間経過時の給湯熱交換器湯温検出手段の検出温度とを比較して該検出温度が上記判断基準湯温よりも高いときには上記非給湯側循環通路の熱媒体の流れがないと判断し、該検出温度が上記判断基準湯温以下のときには上記非給湯側循環通路の熱媒体の流れがあると判断することも上記本第１の発明の特徴的な構成とされている。
【００２５】
さらに、上記非給湯側流れ有無判断用データは試験用バーナー・ポンプ制御部が循環ポンプを駆動させてから給湯熱交換器の湯温が予め定められた基準温度に下がるまでの時間によって与えられ、非給湯側循環通路流れ判断部はこの時間を判断基準時間として該判断基準時間と上記循環ポンプを駆動させてから給湯熱交換器湯温検出手段の検出温度が上記基準温度に下がるまでの検出時間とを比較して該検出時間が上記判断基準時間よりも長いときには上記非給湯側循環通路の熱媒体の流れがないと判断し、該検出時間が上記判断基準時間以内のときには上記非給湯側循環通路の熱媒体の流れがあると判断することも上記本第１の発明の特徴的な構成とされている。
【００２６】
さらに、上記試験用バーナー・ポンプ制御部はバーナー燃焼停止と同時に循環ポンプを駆動させる構成とし、非給湯側流れ有無判断用データはバーナー燃焼停止以降の給湯熱交換器の湯温のピーク温度によって与えられ、非給湯側循環通路流れ判断部はこのピーク温度を判断基準温度として該判断基準温度を給湯熱交換器湯温検出手段の検出温度データのピーク温度と比較して該検出温度データのピーク温度が上記判断基準温度よりも高いときには上記非給湯側循環通路の熱媒体の流れがないと判断し、該検出温度データのピーク温度が上記判断基準温度以下のときには上記非給湯側循環通路の熱媒体の流れがあると判断することも上記第１の発明の特徴的な構成とされている。
【００２７】
さらに、本第２の発明は、給水通路から導かれた水を加熱し給湯通路に湯を供給する給湯熱交換器と、循環ポンプを備えた非給湯側循環通路に組み込まれ該非給湯側循環通路を循環する熱媒体を加熱する非給湯側熱交換器とを有し、上記給湯熱交換器と非給湯側熱交換器は一体化され、上記給湯熱交換器と非給湯側熱交換器を共通に加熱するバーナーが設けられている一缶二水路給湯器において、給湯熱交換器の湯温を検出する給湯熱交換器湯温検出手段と、上記非給湯側循環通路を循環する熱媒体の温度を検出する非給湯側循環通路温度検出手段と、上記非給湯側循環通路の熱媒体の循環流量の検出モードの動作時に上記バーナーを試験的に燃焼させて上記給湯熱交換器湯温検出手段の検出温度が予め定められた温度に達したときにバーナー燃焼を停止させるとともに該バーナー燃焼の停止以降に上記循環ポンプを駆動させる試験用バーナー・ポンプ制御部とを有し、給湯熱交換器湯温情報と非給湯側循環通路の熱媒体の循環流量との関係データが非給湯側循環通路を循環する熱媒体の温度に対応させて予め与えられ、該関係データと上記試験用バーナー・ポンプ制御部による循環ポンプの駆動以降に検出される上記給湯熱交換器湯温検出手段の検出温度データと上記非給湯側循環通路温度検出手段によって検出される非給湯側循環通路の熱媒体の温度とに基づいて上記非給湯側循環通路の熱媒体の循環流量を検出する非給湯側循環流量検出手段が設けられている構成をもって課題を解決するための手段としている。
【００２８】
さらに、上記関係データの給湯熱交換器湯温情報は試験用バーナー・ポンプ制御部によるバーナー燃焼停止以降の給湯熱交換器の湯温立ち下がり勾配によって与えられ、非給湯側循環流量検出手段はこの湯温立ち下がり勾配と上記バーナー燃焼停止以降の給湯熱交換器湯温検出手段の検出温度データの湯温立ち下がり勾配とを比較して上記非給湯側循環通路の熱媒体の循環流量を検出することも上記本第２の発明の特徴的な構成とされている。
【００２９】
さらに、上記関係データの給湯熱交換器湯温情報は試験用バーナー・ポンプ制御部が循環ポンプを駆動させてから予め定められた基準時間が経過したときの給湯熱交換器の湯温によって与えられ、非給湯側循環流量検出手段はこの給湯熱交換器の湯温と上記循環ポンプを駆動させてから上記基準時間経過時の給湯熱交換器湯温検出手段の検出温度とを比較して上記非給湯側循環通路の熱媒体の循環流量を検出することも上記本第２の発明の特徴的な構成とされている。
【００３０】
さらに、上記関係データの給湯熱交換器湯温情報は試験用バーナー・ポンプ制御部が循環ポンプを駆動させてから給湯熱交換器の湯温が予め定められた基準温度に下がるまでの時間によって与えられ、非給湯側循環流量検出手段はこの時間と上記循環ポンプを駆動させてから給湯熱交換器湯温検出手段の検出温度が上記基準温度に下がるまでの検出時間とを比較して上記非給湯側循環通路の熱媒体の循環流量を検出することも上記本第２の発明の特徴的な構成とされている。
【００３１】
さらに、上記試験用バーナー・ポンプ制御部はバーナー燃焼停止と同時に循環ポンプを駆動させる構成とし、関係データの給湯熱交換器湯温情報はバーナー燃焼停止以降の給湯熱交換器の湯温のピーク温度によって与えられ、非給湯側循環流量検出手段はこのピーク温度と給湯熱交換器湯温検出手段の検出温度データのピーク温度とを比較して上記非給湯側循環通路の熱媒体の循環流量を検出することも上記本第２の発明の特徴的な構成とされている。
【００３２】
さらに、上記試験用バーナー・ポンプ制御部は検出モードの動作時にバーナーを試験的に燃焼開始させてから予め定められた時間が経過したときにバーナー燃焼を停止させるとともに該バーナー燃焼の停止以降に循環ポンプを駆動させる構成としたことも上記本第１、第２の発明の特徴的な構成とされている。
【００３３】
さらに、上記非給湯側循環通路は追い焚き循環通路とし、非給湯側熱交換器は追い焚き熱交換器とし、該追い焚き循環通路を循環する熱媒体は湯水とし、非給湯側の運転は風呂の追い焚き運転としたことも本第１、第２の発明の特徴的な構成とされている。
【００３４】
一缶二水路給湯器においては、非給湯側循環通路の非給湯側熱交換器と、給湯熱交換器とは一体化されているので、バーナーの燃焼火炎により給湯熱交換器を加熱した後、循環ポンプを駆動させて非給湯側循環通路の熱媒体を循環させると、この循環する熱媒体は給湯熱交換器の湯から熱量を奪う。そのため、バーナー燃焼停止以降に循環ポンプを駆動させると、給湯熱交換器の湯温の変化形態は、非給湯側循環通路の熱媒体の流れの有無によって異なるものとなる。また、この給湯熱交換器湯温の変化形態は、非給湯側循環通路の熱媒体の循環流量の違いによっても異なり、さらに、非給湯側循環通路を循環する熱媒体の温度の違いによっても異なる。
【００３５】
上記構成の本発明においては、試験用バーナー・ポンプ制御部により、バーナーを試験的に燃焼させた後に停止させ、バーナー燃焼停止以降に循環ポンプを駆動させ、第１の発明においては、給湯熱交換器湯温の変化形態に基づいて非給湯側循環通路の熱媒体の流れ有無の判断を行うための非給湯側流れ有無判断用データと、上記試験用バーナー・ポンプ制御部による循環ポンプの駆動以降に検出される給湯熱交換器湯温検出手段の検出温度データとに基づいて、非給湯側循環通路の熱媒体の流れの有無を判断するために、追い焚き循環通路等の非給湯側循環通路内の髪等のゴミの影響を受けることなく非給湯側循環通路の熱媒体の流れの有無を正確に判断することが可能となり、上記課題が解決される。
【００３６】
また、本第２の発明においては、給湯熱交換器湯温情報と非給湯側循環通路の熱媒体の循環流量との関係データを、非給湯側循環通路を循環する熱媒体の温度に対応させて予め与え、この関係データと上記試験用バーナー・ポンプ制御部による循環ポンプの駆動以降に検出される給湯熱交換器湯温検出手段の検出湯温データと、非給湯側循環通路温度検出手段によって検出される非給湯側循環通路の熱媒体の温度とに基づいて非給湯側循環通路の熱媒体の循環流量を検出することにより、上記本第１の発明と同様に、非給湯側循環通路内の髪等のゴミに左右されることなく、非給湯側循環通路の熱媒体の循環流量を検出することが可能となり、上記課題が解決される。
【００３７】
【発明の実施の形態】
以下、本発明の実施の形態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、上記提案例の給湯器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。本実施形態例の一缶二水路給湯器は一缶二水路風呂給湯器であり、図１０に示した提案例の一缶二水路風呂給湯器とほぼ同様のシステム構成を有しているが、本実施形態例では、給湯熱交換器３の湯温を検出する給湯熱交換器湯温検出手段としての図の破線に示す給湯熱交湯温センサ３３を、給湯熱交換器３のＵ字管に設けており、また、図１０において追い焚き循環通路２４に設けられていた流水スイッチ３６を省略して一缶二水路風呂給湯器のシステムを構成している。
【００３８】
図１には、第１実施形態例の特有な制御構成がブロック図により示されている。同図に示すように、本実施形態例において、制御装置４０は検出モード指令部４２、試験用バーナー・ポンプ制御部４３、追い焚き循環通路水流判断部４５、データ格納部４４を有して構成されている。
【００３９】
検出モード指令部４２は、例えばリモコン４１等の操作が行われたときに、追い焚き循環通路２４の流れ有無（水流有無）判断の検出モードの動作指令を行うものであり、この検出モードの動作指令を試験用バーナー・ポンプ制御部４３と追い焚き循環通路水流判断部４５とに加える。
【００４０】
試験用バーナー・ポンプ制御部４３は、検出モード指令部４２からの指令を受けて、追い焚き循環通路２４の水流有無判断の検出モードの動作時に、バーナー２を試験的に燃焼させて、給湯熱交湯温センサ３３の検出温度が予め定められた温度に達したときにバーナー燃焼を停止させるとともに、バーナー燃焼の停止以降に循環ポンプ２０を駆動させるものである。
【００４１】
試験用バーナー・ポンプ制御部４３は、検出モード指令部４２から追い焚き循環通路２４の水流有無判断の検出モード指令が加えられたときに、電磁弁１０を開け、比例弁１２の開弁量を調節してバーナー２を試験的に燃焼させながら給湯熱交湯温センサ３３の検出温度を時々刻々と取り込み、給湯熱交湯温センサ３３の検出温度が予め定められた温度（例えばＡ℃）に達したときに、電磁弁１０を閉じてバーナー２の燃焼を停止させ、循環ポンプ２０を駆動させる。なお、バーナー燃焼停止と循環ポンプ２０の駆動とは同時に行うこともできるし、循環ポンプ２０の駆動はバーナー２の燃焼を停止させてから予め定められた設定時間経過後に行うこともできる。
【００４２】
試験用バーナー・ポンプ制御部４３は、バーナー２の燃焼開始信号と燃焼停止信号、循環ポンプ２０の駆動信号をそれぞれ追い焚き循環通路水流判断部４５に加える。
【００４３】
データ格納部４４には、給湯熱交換器３の湯温の変化形態に基づいて追い焚き循環通路２４の熱媒体（湯水）の流れの有無、すなわち、水流有無の判断を行うための非給湯側流れ有無判断用データとしての水流有無判断用データが予め与えられている。この水流有無判断用データは、例えば実験等によって求められてデータ格納部４４に与えられるものである。
【００４４】
すなわち、一缶二水路風呂給湯器においては、給湯熱交換器３と追い焚き熱交換器４とが一体化されており、追い焚き循環通路２４を循環する湯水は、給湯熱交換器３内の湯から熱量を奪うために、前記試験用バーナー・ポンプ制御部４３によって、バーナー２の燃焼停止以降に循環ポンプ２０を駆動させたときに、追い焚き循環通路２４内の湯水の流れがあるかないかによって、給湯熱交換器３の湯温の変化形態が異なる。
【００４５】
例えば図２には、試験用バーナー・ポンプ制御部４３によるバーナー２の燃焼開始から、給湯熱交湯温センサ３３の検出温度がＡ℃となったときにバーナー２を燃焼停止させ、同時に、循環ポンプ２０を駆動させたときの、給湯熱交湯温センサ３３によって検出される給湯熱交換器３の湯温変化形態の一例が示されているが、追い焚き循環通路２４の湯水の流れがあるときの給湯熱交換器３の湯温変化形態が同図の特性線ａ示すものとなるのに対し、追い焚き循環通路２４の湯水の流れがないときには、給湯熱交換器３の湯温変化形態は同図の特性線ｂになるといった如く、追い焚き循環通路２４の水流の有無によって給湯熱交換器３の湯温変化形態が大きく異なる。
【００４６】
具体的には、例えばバーナー燃焼停止以降の給湯熱交換器３の湯温のピーク温度は、追い焚き循環通路２４の湯水の流れがあるときには、同図のＰ₁となり、湯水の流れがないときには同図のＰ₂となる。また、循環ポンプ２０を駆動させてから予め定められた基準時間が経過したときの給湯熱交換器３の湯温は、追い焚き循環通路２４の湯水の流れがあるときには同図のＴ₁となり、追い焚き循環通路２４の湯水の流れがないときには同図のＴ₂となる。さらに、試験用バーナー・ポンプ制御部４３が循環ポンプ２０を駆動させてから給湯熱交換器３の湯温が予め定められた基準温度に下がるまでの時間は、追い焚き循環通路２４の湯水の流れがあるときには同図のｔ₁に対し、追い焚き循環通路２４の湯水の流れがないときにはｔ₂となる。
【００４７】
さらに、試験用バーナー・ポンプ制御部４３によるバーナー燃焼停止以降の給湯熱交換器３の湯温立ち下がり勾配も、特性線ａと特性線ｂとでは大きく異なり、特性線ａにおける湯温立ち下がり勾配は、特性線ｂにおける湯温立ち下がり勾配よりも大きい。また、バーナー燃焼停止時の給湯熱交換器３の湯温Ａに対し、前記基準時間経過時の給湯熱交換器３の湯温は、追い焚き循環通路２４の湯水の流れがあるときにはＴ₁でＡ以下であるのに対し、追い焚き循環通路２４の湯水の流れがないときにはＴ₂で、Ａよりも高い。
【００４８】
本出願人は、このような追い焚き循環通路２４の水流有無によって異なる給湯熱交換器３の湯温変化形態の特性に着目し、例えば試験用バーナー・ポンプ制御部４３は、バーナー燃焼停止と同時に循環ポンプ２０を駆動させる構成とし、水流有無判断用データとして、バーナー燃焼停止以降の給湯熱交換器３の湯温のピーク温度（例えばＰ₀）を予めデータ格納部４４に与えている。
【００４９】
追い焚き循環通路水流判断部４５は、非給湯側循環通路流れ判断部として機能するものであり、上記水流有無判断用データと、試験用バーナー・ポンプ制御部４３による循環ポンプ２０の駆動以降に検出される給湯熱交湯温センサ３３の検出温度データとに基づいて、追い焚き循環通路２４の湯水の流れの有無を判断するものである。追い焚き循環通路水流判断部４５は、給湯熱交湯温センサ３３の検出温度を時々刻々と取り込み、また、試験用バーナー・ポンプ制御部４３から加えられる前記バーナー２の燃焼開始信号、燃焼停止信号、循環ポンプ２０の駆動信号を受けて、循環ポンプ２０の駆動以降に検出される給湯熱交湯温センサ３３の検出温度データと、データ格納部４４に格納されている水流有無判断用データとに基づいて追い焚き循環通路２４の湯水の流れの有無を判断する。
【００５０】
追い焚き循環通路水流判断部４５は、この判断に際し、前記データ格納部４４に与えた水流有無判断用データ、すなわち、バーナー燃焼停止以降の給湯熱交換器３の湯温のピーク温度（例えばＰ₀）を判断基準温度として、この判断基準温度を給湯熱交湯温センサ３３の検出温度データのピーク温度と比較し、検出温度データのピーク温度が上記判断基準温度よりも高いときには追い焚き循環通路２４の湯水の流れがないと判断し、検出温度データのピーク温度が上記判断基準温度以下のときには追い焚き循環通路２４の湯水の流れがあると判断する。そして、追い焚き循環通路水流判断部４５は、追い焚き循環通路２４の湯水の流れがあると判断したときには水流あり信号を出力し、追い焚き循環通路２４の湯水の流れがないと判断したときには水流なし信号を出力する。
【００５１】
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、前記提案の給湯器と同様に、制御装置４０による制御によって、給湯運転や湯張り運転や追い焚き運転がそれぞれ行われる。
【００５２】
また、本実施形態例では、リモコン４１の操作等によって、追い焚き循環通路２４の水流有無判断の検出モードの動作開始のための操作が行われたときには、図３のフローチャートに示す動作が行われる。すなわち、同図のステップ１０１で、検出モード指令部４２から水流有無検出モード動作開始指令が試験用バーナー・ポンプ制御部４３と追い焚き循環通路水流判断部４５とに加えられ、ステップ１０２で、試験用バーナー・ポンプ制御部４３によりバーナー燃焼開始が行われる。そして、ステップ１０３で、給湯熱交湯温センサ３３の検出温度が予め定められた温度（Ａ℃）に達したか否かの判断が行われ、給湯熱交湯温センサ３３の温度がＡ℃以上となったときには、ステップ１０４で、バーナー燃焼停止が行われると同時に、ステップ１０５で、循環ポンプ２０の駆動が行われる。
【００５３】
次に、同図のステップ１０６で、追い焚き循環通路水流判断部４５により、給湯熱交湯温センサ３３の検出温度データと前記水流有無判断用データとの比較が行われる。そして、例えば、追い焚き循環通路２４の湯水の流れがあるために、給湯熱交湯温センサ３３の検出温度データが、図２の特性線ａに示したデータとなってピーク温度がＰ₁であり、水流有無判断用データとしての前記判断基準温度Ｐ₀以下である場合には、図３のステップ１０７で、追い焚き循環通路水流判断部４５によって、追い焚き循環通路２４の湯水の流れあり（浴槽２２の残水有り）と判断し、ステップ１０８で、水流あり信号を出力する。
【００５４】
一方、追い焚き循環通路２４の湯水の流れがないために、給湯熱交湯温センサ３３の検出温度データが、図２の特性線ｂに示すデータとなって、そのピーク温度Ｐ₂が前記判断基準温度Ｐ₀よりも大きいときには、図３のステップ１０９で、追い焚き循環通路水流判断部４５によって、追い焚き循環通路２４の湯水の流れなし（浴槽２２の残水無し）と判断し、ステップ１１０で、水流なし信号を出力する。
【００５５】
本実施形態例によれば、上記追い焚き循環通路２４の水流有無判断の検出モードの動作によって、給湯熱交換器３の湯温の変化形態に基づく水流有無判断用データと、給湯熱交湯温センサ３３の検出温度データとに基づいて追い焚き循環通路２４の湯水の流れの有無を判断するために、例えば追い焚き循環通路２４に流水スイッチ３６等を設けて追い焚き循環通路２４の水流有無判断を行う場合と異なり、浴槽湯水に含まれる髪等のゴミに左右されることなく正確に追い焚き循環通路２４の湯水の流れの有無を判断することができる。
【００５６】
そのため、本実施形態例では、従来、一缶二水路風呂給湯器に設けられていた流水スイッチ３６を省略することが可能となり、流水スイッチ３６を省略することにより、その分だけ給湯器のシステム構成を簡略化することができるし、コストダウンを図ることができる。
【００５７】
図４には、本発明に係る一缶二水路風呂給湯器の第２実施形態例に特有な制御構成が示されている。本実施形態例が上記第１実施形態例と異なる特徴的なことな、検出モード指令部４２が、追い焚き循環通路２４の熱媒体の循環流量としての湯水循環流量の検出モード指令を行う構成としたことと、上記第１実施形態例における追い焚き循環通路水流判断部４５の代わりに、湯水循環流量検出手段４６を設け、追い焚き循環通路２４の湯水循環流量を検出する構成としたことである。
【００５８】
試験用バーナー・ポンプ制御部４３は、検出モード指令部４２から追い焚き循環通路２４の湯水循環流量の検出モード指令が加えられたときに、バーナー２の燃焼開始および燃焼停止と、循環ポンプ２０の駆動とを、上記第１実施形態例と同様に行い、バーナー２の燃焼開始信号と燃焼停止信号、循環ポンプ２０の駆動信号を湯水循環流量検出手段４６に加える。
【００５９】
データ格納部４４には、給湯熱交換器湯温情報と追い焚き循環通路２４の湯水循環流量との関係データが、追い焚き循環通路２４を循環する湯水の温度に対応させて予め与えられている。
【００６０】
前記の如く、一缶二水路風呂給湯器においては、追い焚き循環通路２４の循環湯水は給湯熱交換器３の湯から熱量を奪うために、試験用バーナー・ポンプ制御部４３により、バーナー２を試験的に燃焼させた後に、循環ポンプ２０を駆動させたときの給湯熱交換器３の湯温変化形態は、追い焚き循環通路２４の湯水の流れの有無によって異なるものであるが、この給湯熱交換器３の湯温変化形態は、追い焚き循環通路２４の湯水の流れの有無のみならず、湯水の循環流量によっても異なり、さらに、循環湯水の温度によっても異なるものである。
【００６１】
例えば、図５には、試験用バーナー・ポンプ制御部４３によるバーナー２の燃焼開始から循環ポンプ２０の駆動開始以降に給湯熱交湯温センサ３３によって検出される給湯熱交換器３の湯温変化形態が示されているが、追い焚き循環通路２４の湯水の温度が一定のときに、追い焚き循環通路２４の湯水循環流量が多いときには、給湯熱交換器３の湯温変化が同図の特性線ａ₁に示すようになるのに対し、追い焚き循環通路２４の湯水循環流量が少ないときには、給湯熱交換器３の湯温変化は同図の特性線ａ₂に示すようになる。なお、同図の鎖線に示す特性線ｂは、追い焚き循環通路２４の湯水の流れがないときの給湯熱交換器３の湯温変化形態を示す。
【００６２】
これらの特性線ａ₁,ａ₂,ｂに示されるように、給湯熱交換器３の湯温変化形態は、追い焚き循環通路２４の湯水循環流量によって異なり、例えば、バーナー２の燃焼停止と循環ポンプ２０の駆動を同時に行ったときの、バーナー燃焼停止以降の給湯熱交換器３の湯温のピーク温度は、追い焚き循環通路２４の湯水の流れが多くなるにつれて小さくなる（Ｐ_1B＜Ｐ_1S＜Ｐ₂）。
【００６３】
また、試験用バーナー・ポンプ制御部４３が循環ポンプ２０を駆動させてから予め定められた基準時間が経過したときの給湯熱交換器３の湯温は、追い焚き循環通路２４の湯水循環流量が多くなるにつれて低くなる（Ｔ_1B＜Ｔ_1S＜Ｔ₂）。さらに、試験用バーナー・ポンプ制御部４３が循環ポンプ２０を駆動させてから給湯熱交換器３の湯温が予め定められた基準温度に下がるまでの時間は、追い焚き循環通路２４の湯水循環流量が多くなるにつれて短くなる（ｔ_1B＜ｔ_1S＜ｔ₂）。さらに、バーナー燃焼停止以降の給湯熱交換器３の湯温立ち下がり勾配は、追い焚き循環通路２４の湯水循環流量が多くなるにつれて大きくなる。
【００６４】
一方、追い焚き循環通路２４の湯水循環流量が同じであっても、追い焚き循環通路２４の湯水温が異なると、試験用バーナー・ポンプ制御部４３によるバーナー２の燃焼開始から循環ポンプ駆動以降の給湯熱交換器３の湯温変化形態は異なり、例えば前記ピーク温度は追い焚き循環通路２４の湯水温が低くなるにつれて低くなる。また、前記基準時間経過時の給湯熱交換器３の湯温は、追い焚き循環通路２４の湯水温が低くなるにつれて低くなり、前記給湯熱交換器３の湯温が前記基準温度に下がるまでの時間は、追い焚き循環通路２４の湯水温が低くなるにつれて短くなり、前記バーナー燃焼停止以降の給湯熱交換器３の湯温立ち下がり勾配は、追い焚き循環通路２４の湯水温が低くなるにつれて大きくなる。
【００６５】
本出願人は、以上のような、追い焚き循環通路２４の湯水循環流量と湯水温の違いによって、試験用バーナー・ポンプ制御部４３によるバーナー燃焼停止以降の給湯熱交換器３の湯温変化形態が異なることに着目し、給湯熱交換器湯温情報と追い焚き循環通路２４の湯水循環流量との関係データを、追い焚き循環通路２４を循環する湯水の温度に対応させて予め実験等によって求め、例えば図６に示すようなグラフデータや、表データ、演算データによって与えている。なお、図６に示すデータは、前記給湯熱交換器湯温情報を前記ピーク温度とし、このピーク温度を判断基準温度として、判断基準温度と追い焚き循環通路２４の湯水循環流量との関係データを、追い焚き循環通路２４の湯水温に対応させて与えたものであり、同図において、ＢＴ₁,ＢＴ₂,ＢＴ₃はそれぞれ追い焚き循環通路２４の湯水温を示し、ＢＴ₁＞ＢＴ₂＞ＢＴ₃である。
【００６６】
湯水循環流量検出手段４６は、上記関係データと、試験用バーナー・ポンプ制御部４３による循環ポンプ２０の駆動以降に検出される給湯熱交湯温センサ３３の検出温度データと、風呂温度センサ３７によって検出される追い焚き循環通路２４の湯水温とに基づいて追い焚き循環通路２４の湯水循環流量を検出する。
【００６７】
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、前記提案例の給湯器および上記第１実施形態例の給湯器と同様に、給湯運転や湯張り運転や追い焚き運転が行われる。
【００６８】
また、本実施形態例では、追い焚き循環通路２４の湯水循環流量の検出モードの動作が例えばリモコン４１の操作等によって操作されると、図７に示すフローチャートに従って、追い焚き循環通路の湯水循環流量の検出モードの動作が行われる。すなわち、図７のステップＳ₁で、検出モード指令部４２によって循環流量検出モード動作開始指令が試験用バーナー・ポンプ制御部４３と湯水循環流量検出手段４６に加えられると、ステップ１０２からステップ１０５までの動作が、上記第１実施形態例における図３のステップ１０２からステップ１０５までの動作と同様に行われる。
【００６９】
その後、図７のステップＳ₂で、湯水循環流量検出手段４６によって、給湯熱交湯温センサ３３により検出される給湯熱交換器３の検出温度データと、風呂温度センサ３７によって検出される追い焚き循環通路２４の湯水温と、例えば図６に示すような、試験用バーナー・ポンプ制御部４３によるバーナー燃焼停止以降の給湯熱交換器３のピーク温度と追い焚き循環通路２４の湯水循環流量との関係データとに基づいて、追い焚き循環通路２４の湯水循環流量を検出する。例えば、湯水循環流量検出手段４６は、検出温度データのピーク温度が図６のＰ_1Rであり、このときの風呂温度センサ３７の検出温度がＢＴ₁のときには、湯水循環流量はＱ₁であると検出し、風呂温度センサ３７の検出温度がＢＴ₂のときには、追い焚き循環通路２４の湯水循環流量はＱ₂であると検出する。
【００７０】
本実施形態例によれば、上記追い焚き循環通路２４の湯水循環流量の検出モードの動作により、上記関係データと、試験用バーナー・ポンプ制御部４３による循環ポンプ２０の駆動以降に検出される給湯熱交湯温センサ３３の検出温度データと、風呂温度センサ３７によって検出される追い焚き循環通路２４の湯水温とに基づいて、追い焚き循環通路２４の湯水循環流量を検出するようにしたため、例えば追い焚き循環通路２４にボール式水量センサ等を直接設ける場合と異なり、浴槽湯水に含まれる髪等のゴミに左右されることなく、追い焚き循環通路２４の湯水循環流量を正確に検出することが可能となる。そして、このことにより、追い焚き循環通路２４に湯水がない、又は湯水の流れがないことも正確に検出することができる。
【００７１】
そのため、本実施形態例によれば、上記第１実施形態例と同様の効果を奏することができるし、さらに、追い焚き循環通路２４の湯水循環流量を正確に検出し、例えばこの流量に基づき、追い焚き熱交換器４側と給湯熱交換器３側の吸熱比率を求め、追い焚きと給湯の同時燃焼時の燃焼制御も正確に行うことができる。
【００７２】
なお、本発明は上記実施形態例に限定されることはなく、様々な実施の態様を採り得る。例えば、上記第１実施形態例では、水流有無判断用データ（非給湯側流れ有無判断用データ）は、バーナー燃焼停止以降の給湯熱交換器３の湯温のピーク温度によって与えたが、水流有無判断用データは、試験用バーナー・ポンプ制御部４３によるバーナー燃焼停止以降の給湯熱交換器３の湯温立ち下がり勾配によって与えることもできる。この場合、追い焚き循環通路水流判断部４５は、この湯温立ち下がり勾配を基準勾配とし、この基準勾配と上記バーナー燃焼停止以降の給湯熱交湯温センサ３３の検出温度データの湯温立ち下がり勾配とを比較し、検出温度データの湯温立ち下がり勾配が基準勾配よりも小さいときには追い焚き循環通路２４の湯水の流れがないと判断し、上記検出温度データの湯温立ち下がり勾配が上記基準勾配以上のときには追い焚き循環通路２４の湯水の流れがあると判断する。
【００７３】
また、上記水流有無判断用データは、試験用バーナー・ポンプ制御部４３が循環ポンプ２０を駆動させてから予め定められた基準時間が経過したときの給湯熱交換器３の湯温によって与えこともできる。この場合、例えば図８に示すように、上記第１実施形態例と同様の動作を図３のステップ１０１からステップ１０５まで行った後、図８に示すように、ステップ２０１で、追い焚き循環通路水流判断部４５は、上記基準時間が経過したか否かの判断を、追い焚き循環通路水流判断部４５に設けられているタイマ等を用いて行う。
【００７４】
次に、水流有無判断用データとして与えられた給湯熱交換器３の湯温を判断基準湯温とし、同図のステップ２０２で、この判断基準湯温と、上記循環ポンプ２０を駆動させてから上記基準時間経過時の給湯熱交湯温センサ３３の検出温度とを比較して、検出温度が判断基準湯温よりも高いときには、図８のステップ１０９で、追い焚き循環通路２４の湯水の流れなしと判断して、ステップ１１０で、水流なし信号を出力し、上記検出温度が上記判断基準以下のときには、ステップ１０７で、追い焚き循環通路２４の湯水の流れありと判断し、ステップ１０８で、水流あり信号を出力することになる。
【００７５】
さらに、上記水流有無判断用データは、試験用バーナ・ポンプ制御部４３が循環ポンプ２０を駆動させてから給湯熱交換器３の湯温が予め定められた基準温度に下がるまでの時間によって与えることもできる。この場合は、例えば図９に示すように、図３のステップ１０１からステップ１０５までの動作を上記第１実施形態例と同様に行った後、図９のステップ３０１で、循環通路水流判断部４５は、給湯熱交湯温センサ３３の検出温度が上記基準温度以下になったか否かを判断する。
【００７６】
そして、給湯熱交湯温センサ３３の検出温度が基準温度以下となったときには、ステップ３０２で、ステップ１０５からの経過時間、すなわち、循環ポンプ２０を駆動させてから給湯熱交湯温センサ３３の検出温度が基準温度に下がるまでの検出時間が、上記判断基準時間以下か否かを判断し、上記経過時間が上記判断基準時間以内のときには、ステップ１０７で、追い焚き循環通路２４の湯水の流れありと判断し、ステップ１０８で、水流あり信号を出力する。一方、上記経過時間が上記判断基準時間よりも長いときには、ステップ１０９で、追い焚き循環通路２４の湯水の流れなしと判断し、ステップ１１０で、水流なし信号を出力することになる。
【００７７】
さらに、水流有無判断用データは、以上のような温度や時間、湯温立ち下がり勾配等によって与えられるとは限らず、例えば図２に示したような、給湯熱交換器湯温の変化形態に基づいて追い焚き循環通路２４の水流有無の判断を行うための適宜のデータが与えられるものである。
【００７８】
さらに、上記第２実施形態例では、データ格納部４４に与える関係データの給湯熱交換器湯温情報は、バーナー燃焼停止以降の給湯熱交換器３の湯温のピーク温度によって与えたが、関係データの給湯熱交換器湯温情報は、試験用バーナー・ポンプ制御部４３によるバーナー燃焼停止以降の給湯熱交換器３の湯温立ち下がり勾配によって与えてもよい。この場合、湯水循環流量検出手段４６は、この湯温立ち下がり勾配と、バーナー燃焼停止以降の給湯熱交湯温センサ３３の検出温度データの湯温立ち下がり勾配と、追い焚き循環通路２４の湯水温とに基づいて追い焚き循環通路２４の湯水循環流量を検出することになる。
【００７９】
さらに、上記関係データの給湯熱交換器湯温情報は、試験用バーナー・ポンプ制御部４３が循環ポンプ２０を駆動させてから予め定められた基準時間が経過したときの給湯熱交換器３の湯温によって与えてもよい。この場合は、湯水循環流量検出手段４６は、この給湯熱交換器の湯温と、上記循環ポンプ２０を駆動させてから上記基準時間経過時の給湯熱交湯温センサ３３の検出温度と、追い焚き循環通路２４の湯水温とに基づいて追い焚き循環通路２４の湯水循環流量を検出することになる。
【００８０】
さらに、上記関係データの給湯熱交換器湯温情報は、試験用バーナー・ポンプ制御部４３が循環ポンプ２０を駆動させてから給湯熱交換器３の湯温が予め定められた基準温度に下がるまでの時間によって与えてもよい。この場合、湯水循環流量検出手段４６は、この時間と、上記循環ポンプ２０を駆動させてから給湯熱交湯温センサ３３の検出温度が上記基準温度に下がるまでの検出時間と、追い焚き循環通路２４の湯水温とに基づいて、追い焚き循環通路２４の湯水循環流量を検出することになる。
【００８１】
さらに、上記関係データの給湯熱交換器湯温情報は、上記温度や時間、湯温立ち下がり勾配以外の情報としてもよく、例えば図５に示したような給湯熱交換器３の湯温変化形態から得られる適宜の情報を設定することができる。
【００８２】
さらに、上記実施形態例では、試験用バーナー・ポンプ制御部４３は、追い焚き循環通路２４の水流有無判断の検出モード、あるいは、追い焚き循環通路２４の湯水循環流量の検出モードの動作時に、バーナー２を試験的に燃焼させてから、給湯熱交湯温センサ３３の検出温度が予め定められた温度に達したときにバーナー燃焼を停止させたが、試験用バーナー・ポンプ制御部４３は、バーナー２を試験的に燃焼開始させてから予め定められた時間が経過したときにバーナー燃焼を停止させるようにしてもよい。
【００８３】
さらに、上記実施形態例では、試験用バーナー・ポンプ制御部４３は、バーナー２の燃焼停止と同時に、循環ポンプ２０を駆動させるようにしたが、試験用バーナー・ポンプ制御部４３は、バーナー燃焼の停止以降に予め定められた時間が経過したときに、循環ポンプ２０を駆動させるようにしてもよい。
【００８４】
さらに、上記実施形態例では、追い焚き循環通路水流判断部４５と湯水循環流量検出手段４６の一方を設けて給湯器を構成したが、これら両方を設けて給湯器を構成してもよい。
【００８５】
さらに、上記実施形態例では、給湯熱交湯温センサ３３は給湯熱交換器３のＵ字管に設けられていたが、図１０の鎖線に示すように、給湯熱交換器３の出側に設けるようにしてもよい。
【００８６】
さらに、上記実施形態例では、給湯熱交換器３の湯温を給湯熱交湯温センサ３３から直接的に検出していたが、上記給湯熱交換器３の湯温は排気温度に基づき間接的に検出することが可能であることから、排気温度と給湯熱交換器３の湯温との関係データを予め実験や演算等により求めて与えておき、その関係データと排気温度によって給湯熱交換器３の湯温を間接的に検出する給湯熱交換器湯温検出手段を設けるようにしてもよい。より望ましくは、上記関係データと排気温度に基づき検出した給湯熱交換器湯温を、風呂温度センサ３７により検出される追い焚き循環通路の湯温や、予め定まる追い焚き循環湯量や、給湯温度を考慮して補正することによって、より正確な給湯熱交換器３の湯温を検出することが可能である。
【００８７】
さらに、上記各実施形態例は図１０に示す一缶二水路風呂給湯器を例にして説明したが、一缶二水路タイプで、給湯熱交換器の湯温を検出する給湯熱交換器湯温検出手段が設けられ、給湯機能と追い焚き機能を備えている一缶二水路風呂給湯器であれば、この発明を適用することができる。
【００８８】
さらに、本発明は、上記実施形態例のような一缶二水路風呂給湯器にのみ適用されるとは限らず、例えば図１１に示したような給湯暖房機等のように、給湯熱交換器３と、循環ポンプ２０を備えた非給湯側循環通路に組み込まれ非給湯側循環通路を循環する熱媒体を加熱する非給湯側熱交換器等を有し、給湯熱交換器と非給湯側熱交換器が一体化され、給湯熱交換器と非給湯側熱交換器を共通に加熱するバーナーが設けられており、給湯運転機能と非給湯側熱交換器を有する様々な一缶二水路給湯器に広く適用されるものである。
【００８９】
【発明の効果】
本第１の発明によれば、非給湯側循環通路の流れ有無判断の検出モードの動作時に、バーナーを試験的に燃焼させて燃焼停止以降に循環ポンプを駆動させ、循環ポンプの駆動以降に検出される給湯熱交換器湯温検出手段の検出温度データと、予め与えられる給湯熱交換器湯温の変化形態に基づく非給湯側流れ有無判断用データとに基づいて、非給湯側循環通路の熱媒体の流れの有無を判断するようにしたものであるから、追い焚き循環通路等の非給湯側循環通路に流水スイッチ等の流れ検知手段を設けて非給湯側循環通路の熱媒体の有無を検出する場合と異なり、非給湯側循環通路の熱媒体中のゴミ等に左右されることなく、非給湯側循環通路の熱媒体の流れの有無を正確に検出することができる。
【００９０】
また、本第２の発明によれば、上記第１の発明と同様にして得られる給湯熱交換器湯温検出手段の検出データと、予め与えられる給湯熱交換器湯温情報と非給湯側循環通路の熱媒体の循環流量との非給湯側循環通路の熱媒体の温度に対応した関係データとに基づいて、非給湯側循環通路の熱媒体の循環流量を検出するようにしたものであるから、上記第１実施形態例と同様に、非給湯側循環通路に流量センサ等を設けて非給湯側循環通路の熱媒体の循環流量を検出する場合と異なり、浴槽湯水等の非給湯側循環通路の熱媒体中のゴミ等に左右されることなく、非給湯側循環通路の熱媒体の循環流量を正確に検出することが可能となり、したがって、非給湯側循環通路の熱媒体の流れ有無も正確に検出することができる。
【００９１】
以上のように、本発明によれば、非給湯側循環通路の熱媒体の流れの有無を正確に検出できるために、一缶二水路給湯器において、従来、非給湯側循環通路に設けられていた流水スイッチ等の熱媒体の流れの検出手段を省略することも可能となり、その分だけ給湯器のシステム構成を簡略化することが可能となり、コストダウンを図ることができる。
【００９２】
そして、本第２の発明によれば、上記のように、非給湯側循環通路を循環する熱媒体の流量を正確に検出することができるために、例えば検出した流量に基づいて、非給湯側熱交換器側と給湯熱交換器側の吸熱比率を正確に求めることが可能となり、求めた吸熱比率に基づいて、非給湯側燃焼と給湯燃焼の同時燃焼時における燃焼制御を的確に行えるようにすることができる。
【００９３】
さらに、上記流れ有無判断用データや、関係データの給湯熱交換器湯温情報を、試験用バーナー・ポンプ制御部によるバーナー燃焼停止以降の給湯熱交換器の湯温立ち下がり勾配によって与えたり、試験用バーナー・ポンプ制御部が循環ポンプを駆動させてから予め定められた基準時間が経過したときの給湯熱交換器の湯温によって与えたり、試験用バーナー・ポンプ制御部が循環ポンプを駆動させてから給湯熱交換器の湯温が予め定められた基準温度に下がるまでの時間によって与えたり、バーナー燃焼停止以降の給湯熱交換器の湯温のピーク温度によって与えたりすることにより、上記非給湯側循環通路の熱媒体の流れ有無判断や循環流量検出を、容易に、かつ、正確に行うことができる。
【００９４】
さらに、非給湯側循環通路は追い焚き循環通路とし、非給湯側熱交換器は追い焚き熱交換器とし、上記追い焚き循環通路を循環する熱媒体は湯水とし、給湯側の運転は風呂の追い焚き運転とした本発明によれば、以上のような優れた効果を奏する一缶二水路風呂給湯器を提供することができる。
【図面の簡単な説明】
【図１】本発明に係る一缶二水路給湯器の第１実施形態例の制御構成を示すブロック図である。
【図２】一缶二水路風呂給湯器において、バーナーを試験的に燃焼させて燃焼停止と同時に循環ポンプを駆動させたときの給湯熱交換器湯温変化形態を、追い焚き循環通路の湯水の流れがある場合とない場合と比較して示すグラフである。
【図３】上記第１実施形態例の追い焚き循環通路の水流有無判断の検出モード動作を示すフローチャートである。
【図４】本発明に係る一缶二水路給湯器の第２実施形態例の制御構成を示すブロック図である。
【図５】一缶二水路給湯器において、バーナーを試験的に燃焼させて燃焼停止と同時に循環ポンプを駆動させたときの給湯熱交換器の湯温変化形態を、追い焚き循環通路の湯水循環流量の大小によって比較して示すグラフである。
【図６】上記第２実施形態例に与えられる給湯熱交換器湯温情報と追い焚き循環通路の湯水循環流量との関係データの一例を示すグラフである。
【図７】上記第２実施形態例の追い焚き循環通路の湯水循環流量検出モード動作を示すフローチャートである。
【図８】本発明に係る一缶二水路給湯器の他の実施形態例における追い焚き循環通路の水流有無判断の検出モード動作を示すフローチャートである。
【図９】本発明に係る一缶二水路給湯器のさらに他の実施形態例における追い焚き循環通路の水流有無判断の検出モード動作を示すフローチャートである。
【図１０】一缶二水路風呂給湯器のモデル例を示すシステム構成図である。
【図１１】一缶二水路給湯器の一例としての暖房給湯機のシステム構成例を示す要部説明図である。
【符号の説明】
３給湯熱交換器
２０循環ポンプ
２４追い焚き循環通路
３３給湯熱交湯温センサ
３７風呂温度センサ
４３試験用バーナー・ポンプ制御部
４４データ格納部
４５追い焚き循環通路水流判断部
４６湯水循環流量検出手段[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a canned and two-channel water heater in which a hot water supply heat exchanger and a non-hot water heat exchanger such as a reheating heat exchanger are integrated, and the integrated heat exchanger is heated by a common burner. is there.
[0002]
[Prior art]
FIG. 10 shows an example of the system configuration of a single can two water bath hot water heater which is a single can two water heater developed by the present applicants. In the figure, this single can two water bath hot water heater (equipment) has a combustion chamber 1, a burner 2 is disposed in the combustion chamber 1, and a hot water supply heat exchanger 3 and a non-heater 3 are disposed above the burner 2. A reheating heat exchanger 4 as a hot water supply side heat exchanger is provided. These hot water supply heat exchangers 3 and reheating heat exchangers 4 are integrated. That is, the hot water supply side pipe line is inserted through a plurality of common fin plates 5 to form the hot water supply heat exchanger 3, and the reheating side pipe line is also inserted through the fin plate 5 to reheat the heat exchanger. The burner 2 is configured to heat both the hot water supply heat exchanger 3 and the reheating heat exchanger 4.
[0003]
The combustion chamber 1 on the lower side of the burner 2 communicates with an air supply passage 6, and a combustion fan 7 is incorporated in the air supply passage 6. Then, air is sent to the burner 2 and exhaust gas generated by the combustion of the burner 2 is discharged to the outside from the exhaust passage 9 communicating with the combustion chamber 1 above the burner 2.
[0004]
A gas nozzle 19 is disposed opposite to the gas inlet of the burner 2, and a gas supply passage 8 for introducing fuel gas is connected to the gas nozzle 19, and the fuel gas introduced by the gas supply passage 8 is connected to the gas nozzle 19. Is supplied to the burner 2 via the gas nozzle 19. The gas supply passage 8 is provided with electromagnetic valves 10, 11a, 11b for opening and closing the passage, and a proportional valve 12 for controlling the gas supply amount by the valve opening amount.
[0005]
One end side of the water supply passage 13 is connected to the inlet side of the hot water supply heat exchanger 3, one end side of the hot water supply passage 14 is connected to the outlet side of the hot water supply heat exchanger 3, and the other end side of the water supply passage 13 is It is connected to a water supply source through an external pipe, and the other end of the hot water supply passage 14 is led to a desired hot water supply place such as a kitchen through the external pipe. Further, a bypass passage 15 for short-circuiting the inlet side water supply passage 13 and the outlet side hot water supply passage 14 of the hot water supply heat exchanger 3 is provided, and a bypass valve 16 for opening and closing the passage is interposed in the bypass passage 15. It is installed.
[0006]
One end of a pipe 18 is connected to the inlet side of the reheating heat exchanger 4, and the other end of the pipe 18 is connected to the discharge port of the circulation pump 20. One end side of the return pipe 21 is connected, and the other end side of the return pipe 21 is connected to the bathtub 22. In addition, one end side of a pipe line 23 is connected to the outlet side of the reheating heat exchanger 4, and the other end side of the pipe line 23 is connected to the bathtub 22. The return pipe 21, the circulation pump 20, the pipe 18, the reheating heat exchanger 4, and the pipe 23 constitute a recirculation circulation path 24 as a non-hot water supply side circulation path.
[0007]
The pipe 18 of the recirculation circulation passage 24 and the hot water supply passage 14 are communicated with each other by a hot water filling passage 25, and the hot water filling passage 25 has a pouring control valve 26 for controlling the opening and closing of the passage, and the water level of the bathtub 22. And a water level sensor 28 for detecting the above.
[0008]
In the figure, 30 is an air volume sensor that detects the air volume in the combustion chamber 1, 31 is a water volume sensor that is provided in the water supply passage 13 and detects the flow rate of the water supply, and 32 is water in the water supply passage 13. A water temperature sensor for detecting temperature, 34 is a flow rate control valve provided in the hot water supply passage 14 to control the flow rate of water flow, and 35 is provided in the hot water supply passage 14 to indicate that hot water is being supplied. A hot water supply confirmation switch to be detected, 36 is a water flow switch for detecting the presence or absence of water flow in the recirculation circulation passage 24, and 37 is a non-detection for detecting the temperature of the hot water circulation in the recirculation circulation passage 24 as a bath water temperature (bath temperature). A bath temperature sensor is a hot water supply side circulation passage temperature detecting means, and 38 is a hot water temperature sensor for detecting the temperature of hot water produced by the hot water supply heat exchanger 3.
[0009]
A control device 40 is provided in the single can two water bath hot water heater, and a remote controller 41 is connected to the control device 40. The remote control 41 is provided with hot water supply temperature setting means for setting the hot water supply temperature, bath temperature setting means for setting the bath temperature of the bathtub 22, bath water level setting means for setting the hot water level of the bathtub 22, and the like. ing.
[0010]
The control device 40 takes in sensor output signals from various sensors and information from the remote controller 41, and performs various appliance operations such as a hot water supply operation, a hot water filling operation and a reheating operation according to the information and a sequence program given in advance. The operation is controlled as follows.
[0011]
For example, when a faucet of a hot water supply passage led to a kitchen or the like is opened, water flows into the water supply passage 13 from a water supply source, and the water amount sensor 31 detects water passing through the water supply passage 13, the appliance starts a hot water supply operation. . First, the rotational drive of the combustion fan 7 is started, and both or one of the solenoid valves 11a and 11b and the solenoid valve 10 are opened to supply the fuel gas to the burner 2 through the gas supply passage 8, which is not shown. The burner 2 is ignited by ignition means to start combustion.
[0012]
Then, the valve opening amount of the proportional valve 12 is controlled (the amount of gas supplied to the burner 2 is controlled) so that the hot water temperature becomes the hot water setting temperature set in the hot water temperature setting means. The combustion capacity is controlled, and the water flowing through the hot water supply heat exchanger 3 is heated by the combustion flame of the burner 2 to produce hot water having a set temperature, and this hot water is supplied to the hot water supply place through the hot water supply passage 14.
[0013]
When the use of hot water is finished and the faucet is closed, water flow to the hot water supply heat exchanger 3 is stopped, and the electromagnetic valve 10 is closed when the water amount sensor 31 no longer detects water flow through the water supply passage 13. The combustion of the burner 2 is stopped. Thereafter, when a predetermined post-purge period (for example, 5 minutes) elapses, the rotation drive of the combustion fan 7 is stopped, the hot water supply operation is terminated, and the next hot water supply is prepared.
[0014]
When performing the hot water filling operation, for example, the pouring control valve 26 is opened, and by the opening operation of the pouring control valve 26, water flows from the water supply source into the water supply passage 13, and the water amount sensor 31 is connected to the water supply passage 13. When water flow is detected, combustion of the burner 2 is started similarly to the hot water supply operation.
[0015]
Hot water produced in the hot water supply heat exchanger 3 by the combustion flame of the burner 2 is sent to the recirculation circulation passage 24 through the hot water supply passage 14 and the hot water filling passage 25 in order, and the hot water flowing into the recirculation circulation passage 24 returns. It is dropped into the bathtub 22 by two paths, a path passing through the pipe 21 and a path passing through the reheating heat exchanger 4. When the water level of the bathtub 22 detected by the water level sensor 28 reaches the set water level set in the remote controller 41, the pouring control valve 26 is closed, the electromagnetic valve 10 is closed, and the combustion of the burner 2 is stopped. The hot water filling operation is terminated.
[0016]
When the reheating operation is performed, the circulation pump 20 is driven to circulate hot water in the bathtub 22 through the recirculation circulation path 24, and after detecting the flow of this hot water by the flowing water switch 36, the combustion of the burner 2 is started. Reheating is performed by heating the circulating hot water in the reheating heat exchanger 4 with the combustion flame of the burner 2. When the bath temperature detected by the bath temperature sensor 37 reaches the set temperature set by the bath temperature setting means, the combustion of the burner 2 is stopped and the reheating operation is ended.
[0017]
As described above, the single can two water bath hot water heater is a system in which the integrated hot water supply heat exchanger 3 and the reheating heat exchanger 4 are heated by using the common burner 2, and thus are provided separately. Compared with the method in which the hot water supply heat exchanger and the reheating heat exchanger are each heated by combustion using separate burners, the structure of the apparatus can be simplified, and accordingly, the apparatus can be reduced in size and cost can be reduced. Become.
[0018]
FIG. 11 shows an example of a hot water heater as a single can two water heater, in which the same reference numerals are assigned to the same names as the single can two water bath water heater in FIG. It is. Further, in the figure, 57 indicates a heating heat exchanger as a non-hot water supply side heat exchanger, 52 is a heating on / off valve, 53 is a radiator, 54 is a fan, 55 is a cistern tank, and 56 is a bypass passage. Respectively. As the heat medium circulating in the heating circulation passage 51, for example, a solution obtained by adding water to ethylene glycol and propylene glycol is used.
[0019]
[Problems to be solved by the invention]
Conventionally, as described above, when the reheating operation is performed, the hot water in the bathtub 22 is recirculated through the recirculation passage 24 by driving the circulation pump 20, and the flow of this hot water is detected by the water flow switch 36. The burner 2 starts to burn, but the bathtub hot water passing through the recirculation circulation passage 24 contains a lot of garbage such as hair, and the flowing water switch 36 is often entangled with dirt such as hair. For this reason, there has been a demand to detect the flow of hot water in the recirculation passage 24 without using the water flow switch 36 if possible.
[0020]
Further, in the canned and double-channel type bath water heater as described above, for example, based on the heat absorption ratio between the reheating heat exchanger 4 side and the hot water supply heat exchanger 3 side, simultaneous combustion of reheating of hot water supply and bath is performed. In order to perform the combustion control at the time, there is a demand for detecting the circulating flow rate of hot water passing through the recirculation circulation passage 24, and a method of measuring the hot water circulation flow rate in the recirculation circulation passage 24 with a ball-type water amount sensor has been previously used. However, like the flow switch 36, such a sensor is prone to failure when dust in the bath water gets tangled, and the circulating flow rate of the bath water measured tends to be an inaccurate value. there were.
[0021]
The present invention has been made in order to solve the above-mentioned problems, and its purpose is to provide a single-can two-water bath water heater that can accurately detect the presence or absence of hot water flow in the recirculation circulation passage and the circulation flow rate. Furthermore, another object of the present invention is to provide a single can two water channel hot water heater capable of accurately detecting the presence or absence of the flow of the heat medium in the non-hot water supply side circulation passage and the circulation flow rate.
[0022]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has the following configuration as means for solving the problems. That is, the first aspect of the present invention is incorporated in a non-hot water supply side circulation passage provided with a hot water supply heat exchanger that heats water guided from the water supply passage and supplies hot water to the hot water supply passage, and a circulation pump. A non-hot water supply side heat exchanger that heats the heat medium circulating through the hot water supply heat exchanger and the non-hot water supply side heat exchanger are integrated, and the hot water supply heat exchanger and the non-hot water supply side heat exchanger are shared. In a single can two-way water heater equipped with a burner for heating, a hot water heat exchanger hot water temperature detecting means for detecting the hot water temperature of the hot water heat exchanger, and a detection mode for determining whether or not the non-hot water supply side circulation passage is flowing The burner is combusted experimentally during the operation of the hot water supply, and the burner combustion is stopped when the temperature detected by the hot water supply heat exchanger hot water temperature detecting means reaches a predetermined temperature, and the circulation after the burner combustion is stopped. Test bar that drives the pump And a non-hot water supply side flow presence / absence judgment data for judging the presence / absence of the flow of the heat medium in the non-hot water supply side circulation passage based on the change form of the hot water supply heat exchanger hot water temperature. The non-hot water supply side circulation based on the non-hot water supply side flow determination data and the detected temperature data of the hot water heat exchanger hot water temperature detecting means detected after the circulation pump is driven by the test burner / pump control unit A configuration provided with a non-hot water supply side circulation passage flow judgment unit for judging the presence or absence of the flow of the heat medium in the passage serves as means for solving the problem.
[0023]
The non-hot water supply side flow presence / absence judgment data is given by the hot water temperature falling gradient of the hot water heat exchanger after the burner combustion stop by the test burner / pump control unit. Using the temperature falling gradient as a reference gradient, the reference gradient and the hot water temperature falling gradient of the detected temperature data of the hot water heat exchanger hot water detecting means after the burner combustion stop are compared, and the hot water temperature falling of the detected temperature data is compared. When the gradient is smaller than the reference gradient, it is determined that there is no flow of heat medium in the non-hot water supply side circulation passage. When the falling temperature gradient of the detected temperature data is equal to or higher than the reference gradient, the heat medium in the non-hot water supply side circulation passage It is also a characteristic configuration of the first aspect of the present invention to determine that there is a flow.
[0024]
Further, the non-hot water supply side flow presence / absence judgment data is given by the hot water temperature of the hot water supply heat exchanger when a predetermined reference time has elapsed after the test burner / pump control unit has driven the circulation pump. The hot water supply side circulation passage flow judgment unit uses the hot water temperature of the hot water heat exchanger as a judgment reference hot water temperature, and the hot water supply heat exchanger hot water temperature detecting means when the reference time has elapsed after the judgment pump water temperature and the circulation pump are driven. When the detected temperature is higher than the judgment reference hot water temperature, it is judged that there is no flow of the heat medium in the non-hot water supply side circulation passage, and when the detected temperature is lower than the judgment reference hot water temperature. Judging that there is a flow of the heat medium in the non-hot water supply side circulation passage is also a characteristic configuration of the first invention.
[0025]
Further, the non-hot water supply side flow presence / absence judgment data is given by the time from when the test burner / pump control unit drives the circulation pump until the hot water temperature of the hot water heat exchanger drops to a predetermined reference temperature, The non-hot water supply side circulation passage flow determination unit uses this time as a determination reference time, and the detection time from when the reference temperature and the circulating pump are driven until the temperature detected by the hot water heat exchanger hot water temperature detecting means falls to the reference temperature. When the detection time is longer than the determination reference time, it is determined that there is no flow of the heat medium in the non-hot water supply side circulation passage, and when the detection time is within the determination reference time, the non-hot water supply side circulation is determined. Judging that there is a flow of the heat medium in the passage is also a characteristic configuration of the first invention.
[0026]
Furthermore, the test burner / pump control unit is configured to drive the circulation pump simultaneously with the burner combustion stop, and the non-hot water supply side flow presence / absence judgment data is given by the hot water peak temperature of the hot water heat exchanger after the burner combustion stop. The non-hot water supply side circulation passage flow determination unit compares the determination reference temperature with the peak temperature of the detection temperature data of the hot water heat exchanger hot water temperature detection means using the peak temperature as the determination reference temperature, and the peak temperature of the detection temperature data Is higher than the determination reference temperature, it is determined that there is no flow of the heat medium in the non-hot water supply side circulation passage. When the peak temperature of the detected temperature data is equal to or lower than the determination reference temperature, the heat medium in the non-hot water supply side circulation passage is determined. It is also a characteristic configuration of the first invention to determine that there is a flow of the above.
[0027]
Further, the second invention is a non-hot water supply side circulation passage which is incorporated in a non-hot water supply side circulation passage provided with a hot water supply heat exchanger which heats water guided from the water supply passage and supplies hot water to the hot water supply passage, and a circulation pump. A non-hot water supply side heat exchanger that heats the heat medium circulating through the hot water supply heat exchanger and the non-hot water supply side heat exchanger are integrated, and the hot water supply heat exchanger and the non-hot water supply side heat exchanger are shared. In a single can two-channel water heater provided with a heating device, a hot water heat exchanger hot water temperature detecting means for detecting the hot water temperature of the hot water heat exchanger and the temperature of the heat medium circulating in the non-hot water supply side circulation passage Non-hot water supply side circulation passage temperature detection means for detecting the temperature of the hot water supply heat exchanger hot water temperature detection means, and the burner is experimentally combusted during operation in the detection mode of the circulating flow rate of the heat medium in the non-hot water supply side circulation passage. Burner when detection temperature reaches a predetermined temperature A test burner / pump controller for stopping the combustion and driving the circulation pump after the combustion of the burner is stopped, the hot water heat exchanger hot water temperature information, the circulation flow rate of the heat medium in the non-hot water supply side circulation passage, Of the hot water supply heat exchange detected in advance after the circulation data is driven by the test data burner / pump control unit in correspondence with the temperature of the heat medium circulating in the non-hot water supply side circulation passage. The circulating flow rate of the heat medium in the non-hot water supply side circulation passage is determined based on the detected temperature data of the hot water temperature detection means and the temperature of the heat medium in the non-hot water supply side circulation passage detected by the non-hot water supply side circulation passage temperature detection means. The non-hot-water supply side circulating flow rate detecting means for detecting is configured as means for solving the problem.
[0028]
Further, the hot water temperature information of the hot water supply heat exchanger in the above relational data is given by the hot water temperature falling gradient of the hot water heat exchanger after the burner combustion stop by the test burner / pump control unit, and the non-hot water supply side circulation flow rate detecting means The hot water temperature falling gradient is compared with the hot water temperature falling gradient in the temperature data detected by the hot water heat exchanger hot water detection means after the burner combustion stop to detect the circulation flow rate of the heat medium in the non-hot water supply side circulation passage. This is also the characteristic configuration of the second invention.
[0029]
Further, the hot water temperature information of the hot water supply heat exchanger in the above relational data is given by the hot water temperature of the hot water supply heat exchanger when a predetermined reference time has elapsed after the test burner / pump control unit drives the circulation pump. The non-hot water supply side circulation flow rate detecting means compares the hot water temperature of the hot water heat exchanger with the detected temperature of the hot water heat exchanger hot water temperature detecting means when the reference time elapses after driving the circulation pump. Detecting the circulation flow rate of the heat medium in the hot water supply side circulation passage is also a characteristic configuration of the second invention.
[0030]
Furthermore, the hot water temperature information of the hot water supply heat exchanger in the above relational data is given by the time from when the test burner / pump control unit drives the circulation pump until the hot water temperature of the hot water supply heat exchanger drops to a predetermined reference temperature. The non-hot water supply side circulation flow rate detecting means compares the time with the detection time from when the circulating pump is driven to when the detected temperature of the hot water heat exchanger hot water temperature detecting means falls to the reference temperature. Detecting the circulation flow rate of the heat medium in the side circulation passage is also a characteristic configuration of the second invention.
[0031]
Further, the test burner / pump control unit is configured to drive the circulation pump simultaneously with the burner combustion stop, and the hot water heat exchanger water temperature information in the related data is the peak temperature of the hot water temperature of the hot water heat exchanger after the burner combustion stop. The non-hot water supply side circulation flow rate detection means detects the circulation flow rate of the heat medium in the non-hot water supply side circulation passage by comparing this peak temperature with the peak temperature of the detected temperature data of the hot water supply heat exchanger hot water temperature detection means. This is also a characteristic configuration of the second invention.
[0032]
Further, the test burner / pump control unit stops the burner combustion when a predetermined time has elapsed since the start of combustion of the burner on a trial basis during the detection mode operation, and circulates after the burner combustion is stopped. The structure for driving the pump is also a characteristic structure of the first and second inventions.
[0033]
Further, the non-hot water supply side circulation passage is a reheating circulation passage, the non-hot water supply side heat exchanger is a reheating heat exchanger, the heat medium circulating in the reheating circulation passage is hot water, and the operation on the non-hot water supply side is a bath. It is also the characteristic configuration of the first and second aspects of the invention that the reheating operation is performed.
[0034]
In a single can two-water heater, since the non-hot water side heat exchanger of the non-hot water side circulation passage and the hot water heat exchanger are integrated, after heating the hot water heat exchanger by the combustion flame of the burner, When the circulation pump is driven to circulate the heat medium in the non-hot water supply side circulation passage, the circulating heat medium takes heat from the hot water in the hot water supply heat exchanger. For this reason, when the circulation pump is driven after the burner combustion is stopped, the hot water temperature change mode of the hot water supply heat exchanger varies depending on the presence or absence of the flow of the heat medium in the non-hot water supply side circulation passage. The hot water heat exchanger hot water temperature change mode also varies depending on the difference in the circulation flow rate of the heat medium in the non-hot water supply side circulation passage, and also varies depending on the temperature difference in the heat medium circulating in the non-hot water supply side circulation passage. .
[0035]
In the present invention having the above-described configuration, the test burner / pump control unit causes the burner to be burned experimentally and then stopped, and the circulation pump is driven after the burner combustion is stopped. In the first invention, hot water supply heat exchange is performed. Non-hot water supply side flow presence / absence judgment data for determining the presence / absence of heat medium flow in the non-hot water supply side circulation passage based on the change in temperature of the hot water, and after the circulation pump is driven by the test burner / pump control unit In order to determine the presence or absence of the flow of the heat medium in the non-hot water supply side circulation passage based on the detected temperature data of the hot water supply heat exchanger temperature detection means detected in the It is possible to accurately determine the presence or absence of the flow of the heat medium in the non-hot water supply side circulation passage without being affected by dust such as hair inside, and the above-mentioned problems are solved.
[0036]
In the second invention, the relation data between the hot water heat exchanger hot water temperature information and the circulation flow rate of the heat medium in the non-hot water supply side circulation passage is made to correspond to the temperature of the heat medium circulating in the non-hot water supply side circulation passage. And the relationship data, the detected hot water temperature data of the hot water heat exchanger hot water detecting means detected after the circulation pump is driven by the test burner / pump control unit, and the non-hot water supply side circulation passage temperature detecting means. By detecting the circulation flow rate of the heat medium in the non-hot water supply side circulation passage based on the detected temperature of the heat medium in the non-hot water supply side circulation passage, as in the first aspect of the invention, It is possible to detect the circulation flow rate of the heat medium in the non-hot water supply side circulation passage without being influenced by dust such as hair, and the above-mentioned problems are solved.
[0037]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in description of this embodiment, the same code | symbol is attached | subjected to the same name part as the water heater of the said proposal example, and the duplication description is abbreviate | omitted. One can two water channel hot water heater in this embodiment is a single can two water bath water heater, and has a system configuration substantially similar to the one can two water bath hot water heater shown in FIG. In the present embodiment, a hot water supply hot / cold hot water temperature sensor 33 indicated by a broken line in the drawing as hot water supply heat exchanger hot water temperature detecting means for detecting the hot water temperature of the hot water supply heat exchanger 3 is used as a U-shaped tube of the hot water supply heat exchanger 3. In addition, the water flow switch 36 provided in the recirculation circulation passage 24 in FIG. 10 is omitted, and a one-can two-water bath water heater system is configured.
[0038]
FIG. 1 is a block diagram showing a specific control configuration of the first embodiment. As shown in the figure, in this embodiment, the control device 40 includes a detection mode command unit 42, a test burner / pump control unit 43, a recirculation circulation passage water flow determination unit 45, and a data storage unit 44. Has been.
[0039]
The detection mode command unit 42 issues an operation command for a detection mode for determining whether or not the recirculation circulation passage 24 is flowing (water flow is present or not) when, for example, an operation of the remote controller 41 or the like is performed. The command is applied to the test burner / pump control unit 43 and the recirculation circulation passage water flow determination unit 45.
[0040]
Upon receiving the command from the detection mode command unit 42, the test burner / pump control unit 43 causes the burner 2 to combust on a trial basis during operation in the detection mode for determining whether there is a water flow in the recirculation circulation passage 24, and heats the hot water supply. When the temperature detected by the hot water temperature sensor 33 reaches a predetermined temperature, the burner combustion is stopped, and the circulation pump 20 is driven after the burner combustion is stopped.
[0041]
The test burner / pump control unit 43 opens the electromagnetic valve 10 and sets the opening amount of the proportional valve 12 when a detection mode command for determining the presence or absence of water flow in the recirculation passage 24 is applied from the detection mode command unit 42. The detected temperature of the hot water hot water temperature sensor 33 is taken in every moment while adjusting and burning the burner 2 on a trial basis, and the detected temperature of the hot water hot water temperature sensor 33 is set to a predetermined temperature (for example, A ° C.). When it reaches, the solenoid valve 10 is closed, the combustion of the burner 2 is stopped, and the circulation pump 20 is driven. The burner combustion stop and the circulation pump 20 can be driven simultaneously, or the circulation pump 20 can be driven after a predetermined set time has elapsed since the combustion of the burner 2 was stopped.
[0042]
The test burner / pump control unit 43 adds the combustion start signal and combustion stop signal of the burner 2 and the drive signal of the circulation pump 20 to the recirculation circulation passage water flow determination unit 45, respectively.
[0043]
The data storage unit 44 has a non-hot water supply side for determining whether or not there is a flow of the heat medium (hot water) in the recirculation circulation passage 24 based on the hot water temperature change mode of the hot water supply heat exchanger 3, that is, whether or not the water flow is present. Water flow presence / absence determination data as flow presence / absence determination data is provided in advance. This water flow presence / absence determination data is obtained by, for example, an experiment and given to the data storage unit 44.
[0044]
That is, in the single can two water bath hot water heater, the hot water supply heat exchanger 3 and the reheating heat exchanger 4 are integrated, and hot water circulating in the recirculation circulation passage 24 is stored in the hot water supply heat exchanger 3. Whether or not there is a flow of hot water in the recirculation circulation passage 24 when the circulating pump 20 is driven after the combustion of the burner 2 is stopped by the test burner / pump control unit 43 in order to take heat away from the hot water. The hot water temperature change mode of the hot water supply heat exchanger 3 varies depending on the type of the hot water supply.
[0045]
For example, in FIG. 2, the combustion of the burner 2 is stopped by the test burner / pump control unit 43 when the temperature detected by the hot water supply hot water temperature sensor 33 reaches A ° C. Although an example of the hot water temperature change form of the hot water supply heat exchanger 3 detected by the hot water supply hot water temperature sensor 33 when the pump 20 is driven is shown, there is a flow of hot water in the recirculation circulation passage 24. When the hot water temperature change mode of the hot water supply heat exchanger 3 is as shown by the characteristic line a in the figure, when there is no flow of hot water in the recirculation circulation passage 24, the hot water temperature change mode of the hot water supply heat exchanger 3 As shown by the characteristic line b in FIG. 5, the hot water temperature change mode of the hot water supply heat exchanger 3 is greatly different depending on the presence or absence of water flow in the recirculation circulation passage 24.
[0046]
Specifically, for example, the peak temperature of the hot water temperature of the hot water supply heat exchanger 3 after the combustion of the burner is stopped is indicated by P in FIG. ₁ When there is no hot water flow, ₂ It becomes. Further, the hot water temperature of the hot water supply heat exchanger 3 when a predetermined reference time has elapsed after the circulation pump 20 is driven is indicated by T in the figure when there is a flow of hot water in the recirculation circulation passage 24. ₁ When there is no hot water flow in the recirculation circulation passage 24, T in FIG. ₂ It becomes. Furthermore, the time from when the test burner / pump control unit 43 drives the circulation pump 20 until the hot water temperature of the hot water supply heat exchanger 3 falls to a predetermined reference temperature is the flow of hot water in the recirculation circulation passage 24. When there is t ₁ On the other hand, when there is no flow of hot water in the recirculation circulation passage 24, t ₂ It becomes.
[0047]
Furthermore, the hot water temperature falling gradient of the hot water supply heat exchanger 3 after the burner combustion stop by the test burner / pump control unit 43 is greatly different between the characteristic line a and the characteristic line b, and the hot water temperature falling gradient on the characteristic line a. Is larger than the hot water temperature falling gradient in the characteristic line b. Further, the hot water temperature of the hot water supply heat exchanger 3 when the reference time has elapsed with respect to the hot water temperature A of the hot water supply heat exchanger 3 when the burner combustion is stopped is T when the hot water flows in the recirculation circulation passage 24. ₁ Is less than or equal to A, but when there is no flow of hot water in the recirculation circulation passage 24, T ₂ And higher than A.
[0048]
The present applicant pays attention to the characteristics of the hot water temperature change mode of the hot water supply heat exchanger 3 that varies depending on the presence or absence of the water flow in the recirculation circulation passage 24. For example, the test burner / pump control unit 43 simultaneously performs burner combustion stop The circulation pump 20 is configured to be driven, and as the water flow presence / absence determination data, the peak temperature of the hot water temperature of the hot water supply heat exchanger 3 after the burner combustion stop (for example, P ₀ ) Is provided to the data storage unit 44 in advance.
[0049]
The recirculation circulation passage water flow judgment section 45 functions as a non-hot water supply side circulation passage flow judgment section, and is detected after the water flow presence / absence judgment data and the circulation burner / pump control section 43 drive the circulation pump 20. Based on the detected temperature data of the hot water supply / hot water temperature sensor 33, the presence / absence of hot water flowing in the recirculation circulation passage 24 is determined. The recirculation circulation passage water flow determination unit 45 takes in the temperature detected by the hot water supply hot water hot water temperature sensor 33 every moment, and the combustion start signal and combustion stop signal of the burner 2 applied from the test burner / pump control unit 43. In response to the drive signal of the circulation pump 20, the detected temperature data of the hot water supply hot / cold hot water temperature sensor 33 detected after the drive of the circulation pump 20 and the water flow presence / absence determination data stored in the data storage unit 44 are used. Based on this, the presence / absence of hot water flow in the recirculation circulation passage 24 is determined.
[0050]
In this determination, the recirculation circulation passage water flow determination unit 45 provides the water flow presence / absence determination data given to the data storage unit 44, that is, the peak temperature of the hot water temperature of the hot water supply heat exchanger 3 after the burner combustion stop (for example, P ₀ ) As a judgment reference temperature, this judgment reference temperature is compared with the peak temperature of the detected temperature data of the hot water supply hot water temperature sensor 33, and when the peak temperature of the detected temperature data is higher than the judgment reference temperature, the recirculation circulation passage 24 It is determined that there is no hot water flow, and when the peak temperature of the detected temperature data is equal to or lower than the determination reference temperature, it is determined that there is a hot water flow in the recirculation circulation passage 24. The recirculation circulation passage water flow determination unit 45 outputs a water flow presence signal when it determines that there is a flow of hot water in the recirculation circulation passage 24, and a water flow when it determines that there is no flow of hot water in the recirculation circulation passage 24. No signal is output.
[0051]
The present embodiment is configured as described above, and also in the present embodiment, the hot water supply operation, the hot water operation, and the reheating operation are performed by the control device 40 as in the proposed hot water heater. .
[0052]
Further, in the present embodiment, when an operation for starting the operation of the detection mode for determining whether there is water flow in the recirculation circulation passage 24 is performed by operating the remote controller 41 or the like, the operation shown in the flowchart of FIG. 3 is performed. . That is, in step 101 of the figure, a water flow presence / absence detection mode operation start command is applied from the detection mode command unit 42 to the test burner / pump control unit 43 and the recirculation circulation passage water flow determination unit 45. Burner combustion is started by the burner / pump control unit 43. In step 103, it is determined whether or not the temperature detected by the hot water supply hot water temperature sensor 33 has reached a predetermined temperature (A ° C.), and the temperature of the hot water hot water temperature sensor 33 is A ° C. When this is the case, burner combustion is stopped in step 104, and at the same time, the circulation pump 20 is driven in step 105.
[0053]
Next, in step 106 in the figure, the recirculation circulation passage water flow determination unit 45 compares the temperature data detected by the hot water supply hot water temperature sensor 33 with the water flow presence / absence determination data. For example, since there is a flow of hot water in the recirculation circulation passage 24, the temperature data detected by the hot water supply hot water temperature sensor 33 becomes the data indicated by the characteristic line a in FIG. ₁ And the determination reference temperature P as water flow presence / absence determination data ₀ In the case of the following, in step 107 of FIG. 3, the recirculation circulation passage water flow determination unit 45 determines that there is a hot water flow in the recirculation circulation passage 24 (there is residual water in the bathtub 22), and in step 108, Outputs a signal with water flow.
[0054]
On the other hand, since there is no flow of hot water in the recirculation circulation passage 24, the temperature data detected by the hot water supply hot water temperature sensor 33 becomes the data shown by the characteristic line b in FIG. ₂ Is the reference temperature P ₀ If it is larger, the recirculation circulation passage water flow determination unit 45 determines in step 109 in FIG. 3 that there is no hot water flow in the recirculation circulation passage 24 (no residual water in the bathtub 22), and in step 110 there is no water flow. Output a signal.
[0055]
According to the present embodiment, the water flow presence / absence determination data based on the hot water temperature change mode of the hot water supply heat exchanger 3 and the hot water hot / cold hot water temperature by the operation in the detection mode of the water flow presence / absence determination of the recirculation circulation passage 24. In order to determine the presence or absence of the flow of hot water in the recirculation circulation passage 24 based on the temperature data detected by the sensor 33, for example, a flow switch 36 or the like is provided in the recirculation circulation passage 24 to determine the presence or absence of water flow in the recirculation circulation passage 24. Unlike the case of performing the above, it is possible to accurately determine whether there is a flow of hot water in the recirculation passage 24 without being affected by dust such as hair contained in the bathtub hot water.
[0056]
Therefore, in the present embodiment, it is possible to omit the flowing water switch 36 that has been conventionally provided in the single can two-channel bath water heater, and by omitting the flowing water switch 36, the system configuration of the water heater correspondingly. Can be simplified and the cost can be reduced.
[0057]
FIG. 4 shows a control configuration peculiar to the second embodiment of the single can / two channel bath water heater according to the present invention. The present embodiment is different from the first embodiment in that the detection mode command section 42 issues a detection mode command for the hot water circulation flow rate as the circulation flow rate of the heat medium in the recirculation circulation passage 24. That is, instead of the recirculation circulation passage water flow determination unit 45 in the first embodiment, a hot water circulation flow rate detection means 46 is provided to detect the hot water circulation flow rate in the recirculation circulation passage 24. .
[0058]
When a detection mode command for the hot water circulation flow rate in the recirculation circulation passage 24 is applied from the detection mode command unit 42, the test burner pump control unit 43 The drive is performed in the same manner as in the first embodiment, and the combustion start signal and combustion stop signal of the burner 2 and the drive signal of the circulation pump 20 are applied to the hot water circulation flow rate detection means 46.
[0059]
In the data storage unit 44, relational data between the hot water heat exchanger hot water temperature information and the hot water circulation flow rate in the recirculation circulation passage 24 is given in advance corresponding to the temperature of the hot water circulating in the recirculation circulation passage 24. .
[0060]
As described above, in the canned two-channel bath water heater, the circulating hot water in the recirculation circulation passage 24 takes heat from the hot water in the hot water supply heat exchanger 3, so that the burner 2 is controlled by the test burner / pump control unit 43. The hot water temperature change mode of the hot water supply heat exchanger 3 when the circulation pump 20 is driven after burning on a trial basis varies depending on the presence or absence of hot water flow in the recirculation circulation passage 24. The hot water temperature change mode of the exchanger 3 depends not only on the presence or absence of hot water flow in the recirculation circulation passage 24, but also on the circulating flow rate of hot water, and also on the temperature of the circulating hot water.
[0061]
For example, FIG. 5 shows a change in hot water temperature of the hot water supply heat exchanger 3 detected by the hot water supply hot water temperature sensor 33 from the start of combustion of the burner 2 by the test burner / pump control unit 43 after the start of driving of the circulation pump 20. Although the form is shown, when the temperature of the hot water in the recirculation circulation passage 24 is constant and the hot water circulation flow rate in the recirculation circulation passage 24 is large, the change in the hot water temperature of the hot water supply heat exchanger 3 is the characteristic shown in FIG. Line a ₁ On the other hand, when the hot water circulation flow rate in the recirculation circulation passage 24 is small, the change in hot water temperature of the hot water supply heat exchanger 3 is the characteristic line a in FIG. ₂ As shown. In addition, the characteristic line b shown by the chain line in the figure shows the hot water temperature change mode of the hot water supply heat exchanger 3 when there is no flow of hot water in the recirculation circulation passage 24.
[0062]
These characteristic lines a ₁ , a ₂ , b, the hot water temperature change mode of the hot water supply heat exchanger 3 differs depending on the hot water circulation flow rate in the recirculation circulation passage 24, for example, when the combustion stop of the burner 2 and the circulation pump 20 are driven simultaneously. The peak temperature of the hot water in the hot water supply heat exchanger 3 after the burner combustion stop is reduced as the flow of hot water in the recirculation circulation passage 24 increases (P _1B <P _1S <P ₂ ).
[0063]
The hot water temperature of the hot water supply heat exchanger 3 when a predetermined reference time has elapsed after the test burner / pump control unit 43 drives the circulation pump 20 is determined by the hot water circulation flow rate in the recirculation circulation passage 24. It becomes low as it increases (T _1B <T _1S <T ₂ ). Furthermore, the time from when the test burner / pump control unit 43 drives the circulation pump 20 until the hot water temperature of the hot water supply heat exchanger 3 falls to a predetermined reference temperature is the hot water circulation flow rate in the recirculation circulation passage 24. Becomes shorter as t increases (t _1B <T _1S <T ₂ ). Furthermore, the hot water temperature falling gradient of the hot water supply heat exchanger 3 after the burner combustion stop increases as the hot water circulation flow rate in the recirculation circulation passage 24 increases.
[0064]
On the other hand, even if the hot water circulation flow rate in the recirculation circulation passage 24 is the same, if the hot water temperature in the recirculation circulation passage 24 is different, the combustion of the burner 2 by the test burner / pump control unit 43 is started and after the circulation pump is driven. The hot water temperature change mode of the hot water supply heat exchanger 3 is different. For example, the peak temperature becomes lower as the hot water temperature of the recirculation circulation passage 24 becomes lower. Moreover, the hot water temperature of the hot water supply heat exchanger 3 when the reference time elapses becomes lower as the hot water temperature of the recirculation circulation passage 24 becomes lower, and the hot water temperature of the hot water supply heat exchanger 3 is lowered to the reference temperature. The time decreases as the hot water temperature in the recirculation circulation passage 24 decreases, and the hot water temperature falling gradient of the hot water supply heat exchanger 3 after the burner combustion stop increases as the hot water temperature in the recirculation circulation passage 24 decreases. Become.
[0065]
The present applicant, as described above, changes the hot water temperature of the hot water supply heat exchanger 3 after the burner combustion is stopped by the test burner / pump control unit 43 due to the difference between the hot water circulation flow rate and the hot water temperature in the recirculation circulation passage 24. The relationship between the hot water heat exchanger hot water temperature information and the hot water circulation flow rate in the recirculation circulation passage 24 is obtained in advance by experiments or the like corresponding to the temperature of the hot water circulating in the recirculation circulation passage 24. For example, it is given by graph data, table data, and calculation data as shown in FIG. Note that the data shown in FIG. 6 includes the relation data between the judgment reference temperature and the hot water circulation flow rate in the recirculation circulation passage 24 with the hot water supply heat exchanger hot water temperature information as the peak temperature and the peak temperature as the judgment reference temperature. , Given according to the hot water temperature of the recirculation circulation passage 24, ₁ , BT ₂ , BT _Three Indicates the hot water temperature of the recirculation circulation passage 24, and BT ₁ > BT ₂ > BT _Three It is.
[0066]
The hot water circulating flow rate detection means 46 is based on the above-mentioned relational data, detected temperature data of the hot water hot water hot water temperature sensor 33 detected after the circulation pump 20 is driven by the test burner / pump control unit 43, and the bath temperature sensor 37. Based on the detected hot water temperature in the recirculation circulation passage 24, the hot water circulation flow rate in the recirculation circulation passage 24 is detected.
[0067]
The present embodiment is configured as described above, and in this embodiment as well, as with the water heater in the proposed example and the water heater in the first embodiment, the hot water supply operation, the hot water operation and the reheating operation are performed. Is done.
[0068]
Further, in this embodiment, when the operation in the hot water circulation flow rate detection mode of the recirculation circulation passage 24 is operated, for example, by operating the remote controller 41 or the like, the hot water circulation flow rate of the recirculation circulation passage according to the flowchart shown in FIG. The detection mode operation is performed. That is, step S in FIG. ₁ When the detection mode command unit 42 gives a circulation flow rate detection mode operation start command to the test burner / pump control unit 43 and the hot water circulation flow rate detection means 46, the operations from step 102 to step 105 are performed in the first embodiment. This is performed in the same manner as the operations from step 102 to step 105 in FIG.
[0069]
Thereafter, step S in FIG. ₂ Thus, the hot water circulation flow rate detecting means 46 detects the detected temperature data of the hot water supply heat exchanger 3 detected by the hot water supply hot water temperature sensor 33, the hot water temperature of the recirculation circulation passage 24 detected by the bath temperature sensor 37, and For example, based on the relationship data between the peak temperature of the hot water supply heat exchanger 3 after the burner combustion stop and the hot water circulation flow rate in the recirculation circulation passage 24 as shown in FIG. The hot water circulation flow rate of the soaking circulation passage 24 is detected. For example, the hot water circulation flow rate detection means 46 has a peak temperature of the detected temperature data of P in FIG. _1R The temperature detected by the bath temperature sensor 37 at this time is BT ₁ The hot water circulation flow rate is Q ₁ And the detected temperature of the bath temperature sensor 37 is BT. ₂ The hot water circulation flow rate in the recirculation circulation passage 24 is Q ₂ It detects that it is.
[0070]
According to the present embodiment, hot water detected after the circulation pump 20 is driven by the test burner / pump controller 43 by the operation in the hot water circulation flow rate detection mode of the recirculation circulation passage 24. Since the hot water circulation flow rate in the recirculation circulation passage 24 is detected based on the detected temperature data of the hot water temperature sensor 33 and the hot water temperature in the recirculation circulation passage 24 detected by the bath temperature sensor 37, for example, Unlike the case where a ball-type water amount sensor or the like is directly provided in the recirculation circulation passage 24, it is possible to accurately detect the hot water circulation flow rate in the recirculation circulation passage 24 without being influenced by dust such as hair contained in the bathtub hot water. It becomes possible. Thus, it can be accurately detected that there is no hot water or no hot water in the recirculation circulation passage 24.
[0071]
Therefore, according to the present embodiment example, the same effect as the first embodiment example can be obtained, and the hot water circulation flow rate of the recirculation circulation passage 24 is accurately detected, for example, based on this flow rate, The heat absorption ratio between the reheating heat exchanger 4 side and the hot water supply heat exchanger 3 side is obtained, and combustion control at the time of simultaneous combustion of reheating and hot water supply can be accurately performed.
[0072]
In addition, this invention is not limited to the said embodiment example, Various aspects can be taken. For example, in the first embodiment, the water flow presence / absence determination data (non-hot water supply side flow presence / absence determination data) is given by the hot water peak temperature of the hot water supply heat exchanger 3 after the burner combustion stop. The determination data can also be given by the hot water temperature falling gradient of the hot water supply heat exchanger 3 after the burner combustion stop by the test burner / pump control unit 43. In this case, the recirculation circulation passage water flow determination unit 45 uses the hot water temperature falling gradient as a reference gradient, and the hot water temperature falling of the detected temperature data of the hot water supply hot water temperature sensor 33 after the burner combustion stop is performed. When the hot water falling slope of the detected temperature data is smaller than the reference slope, it is determined that there is no hot water flow in the recirculation circulation passage 24, and the hot water falling slope of the detected temperature data is the reference temperature. When the slope is equal to or greater than the gradient, it is determined that there is a flow of hot water in the recirculation circulation passage 24.
[0073]
The water flow presence / absence determination data may be given by the hot water temperature of the hot water supply heat exchanger 3 when a predetermined reference time has elapsed after the test burner / pump control unit 43 drives the circulation pump 20. it can. In this case, for example, as shown in FIG. 8, after performing the same operation as in the first embodiment from step 101 to step 105 in FIG. 3, as shown in FIG. The water flow determination unit 45 determines whether or not the reference time has elapsed by using a timer or the like provided in the follow-up circulation passage water flow determination unit 45.
[0074]
Next, the hot water temperature of the hot water supply heat exchanger 3 given as the water flow presence / absence judgment data is set as a judgment reference hot water temperature, and after the judgment reference hot water temperature and the circulating pump 20 are driven in step 202 of FIG. When the detected temperature is higher than the judgment reference hot water temperature by comparing with the detected temperature of the hot water supply hot water temperature sensor 33 when the reference time has elapsed, the flow of hot water in the recirculation circulation passage 24 in step 109 of FIG. In step 110, it is determined that there is no water flow signal. When the detected temperature is equal to or lower than the determination criterion, it is determined in step 107 that there is a flow of hot water in the recirculation circulation passage 24, and in step 108, A signal with water flow is output.
[0075]
Further, the water flow presence / absence determination data is given by the time from when the test burner / pump control unit 43 drives the circulation pump 20 until the hot water temperature of the hot water supply heat exchanger 3 falls to a predetermined reference temperature. You can also. In this case, for example, as shown in FIG. 9, the operation from step 101 to step 105 in FIG. 3 is performed in the same manner as in the first embodiment, and then in step 301 in FIG. Determines whether the temperature detected by the hot water supply hot water temperature sensor 33 is equal to or lower than the reference temperature.
[0076]
Then, when the detected temperature of the hot water supply hot water temperature sensor 33 becomes equal to or lower than the reference temperature, in step 302, the elapsed time from step 105, that is, after the circulation pump 20 is driven, It is determined whether or not the detection time until the detected temperature falls to the reference temperature is equal to or less than the determination reference time. When the elapsed time is within the determination reference time, in step 107, the flow of hot water in the recirculation circulation passage 24 is determined. It is determined that there is a water flow, and in step 108, a water flow presence signal is output. On the other hand, when the elapsed time is longer than the determination reference time, it is determined in step 109 that there is no hot water flowing in the recirculation circulation passage 24, and in step 110, a no water flow signal is output.
[0077]
Furthermore, the water flow presence / absence determination data is not necessarily given by the temperature, time, and hot water falling gradient as described above. For example, the hot water supply heat exchanger hot water temperature changes as shown in FIG. Based on this, appropriate data for determining the presence or absence of water flow in the recirculation circulation passage 24 is given.
[0078]
Further, in the second embodiment, the hot water heat exchanger hot water temperature information of the relational data given to the data storage unit 44 is given by the hot water peak temperature of the hot water supply heat exchanger 3 after the burner combustion stop. The hot water temperature information of the hot water supply heat exchanger in the data may be given by the hot water temperature falling gradient of the hot water supply heat exchanger 3 after the burner combustion stop by the test burner / pump control unit 43. In this case, the hot water circulation flow rate detection means 46 detects the hot water temperature falling gradient, the hot water temperature falling gradient detected by the hot water supply hot water temperature sensor 33 after the burner combustion stop, and the hot water in the recirculation circulation passage 24. Based on the water temperature, the hot water circulation flow rate in the recirculation circulation passage 24 is detected.
[0079]
Further, the hot water temperature information of the hot water supply heat exchanger of the above-mentioned related data is the hot water of the hot water supply heat exchanger 3 when a predetermined reference time has elapsed after the test burner / pump control unit 43 drives the circulation pump 20. You may give by temperature. In this case, the hot water circulating flow rate detecting means 46 additionally detects the hot water temperature of the hot water heat exchanger, the detected temperature of the hot water hot water temperature sensor 33 when the reference time has elapsed since the circulation pump 20 was driven. The hot water circulation flow rate in the recirculation circulation passage 24 is detected based on the hot water temperature in the circulation circulation passage 24.
[0080]
Further, the hot water temperature information of the hot water supply heat exchanger in the relational data is obtained until the hot water temperature of the hot water supply heat exchanger 3 falls to a predetermined reference temperature after the test burner / pump control unit 43 drives the circulation pump 20. It may be given according to the time. In this case, the hot water circulation flow rate detecting means 46 detects this time, the detection time from when the circulating pump 20 is driven until the temperature detected by the hot water supply hot water temperature sensor 33 falls to the reference temperature, and the recirculation circulation path. On the basis of the hot water temperature of 24, the hot water circulation flow rate of the recirculation circulation passage 24 is detected.
[0081]
Furthermore, the hot water temperature information of the hot water supply heat exchanger in the related data may be information other than the temperature, time, and falling slope of the hot water temperature. For example, the hot water temperature change mode of the hot water supply heat exchanger 3 as shown in FIG. Appropriate information obtained from can be set.
[0082]
Further, in the above-described embodiment, the test burner / pump control unit 43 operates in the detection mode for determining whether there is water flow in the recirculation circulation passage 24 or in the detection mode for the hot water circulation flow rate in the recirculation circulation passage 24. Burner combustion was stopped when the detected temperature of the hot water supply hot water hot water temperature sensor 33 reached a predetermined temperature, but the test burner / pump control unit 43 The burner combustion may be stopped when a predetermined time has elapsed since the start of the combustion of 2 on a trial basis.
[0083]
Further, in the above embodiment, the test burner / pump control unit 43 drives the circulation pump 20 simultaneously with the combustion stop of the burner 2, but the test burner / pump control unit 43 performs the burner combustion. The circulation pump 20 may be driven when a predetermined time has elapsed since the stop.
[0084]
Furthermore, in the above-described embodiment, one of the recirculation circulation passage water flow determination unit 45 and the hot water circulation flow rate detection means 46 is provided to configure the water heater, but both may be provided to configure the water heater.
[0085]
Furthermore, in the above embodiment, the hot water supply / hot water temperature sensor 33 is provided in the U-shaped tube of the hot water supply heat exchanger 3, but on the outlet side of the hot water supply heat exchanger 3 as shown by the chain line in FIG. 10. You may make it provide.
[0086]
Further, in the above embodiment, the hot water temperature of the hot water supply heat exchanger 3 is detected directly from the hot water supply hot water temperature sensor 33, but the hot water temperature of the hot water supply heat exchanger 3 is indirectly based on the exhaust gas temperature. Therefore, the relationship data between the exhaust temperature and the hot water temperature of the hot water supply heat exchanger 3 is obtained in advance through experiments and calculations, and the hot water supply heat exchanger is determined according to the relationship data and the exhaust temperature. The hot water supply heat exchanger hot water temperature detecting means for indirectly detecting the hot water temperature 3 may be provided. More desirably, the hot water temperature of the hot water supply heat exchanger detected based on the relational data and the exhaust gas temperature is set as the hot water temperature of the recirculation circulation passage detected by the bath temperature sensor 37, the predetermined recirculation hot water volume or the hot water supply temperature. By correcting in consideration, it is possible to detect the hot water temperature of the hot water supply heat exchanger 3 more accurately.
[0087]
Further, each of the above embodiments has been described by taking the single-can two-channel bath water heater shown in FIG. 10 as an example. However, in the single-can two-channel type, the hot water temperature of the hot water supply heat exchanger for detecting the hot water temperature of the hot water supply heat exchanger is described. The present invention can be applied to any one can two water channel bath water heater provided with detection means and having a hot water supply function and a reheating function.
[0088]
Furthermore, the present invention is not necessarily applied only to the single can two water bath hot water heater as in the above-described embodiment. For example, a hot water heater such as a hot water heater shown in FIG. 3 and a non-hot water supply side heat exchanger that heats a heat medium that is incorporated in a non-hot water supply side circulation passage provided with a circulation pump 20 and circulates through the non-hot water supply side circulation passage. Various cans and two-way water heaters with a hot water supply operation function and a non-hot water supply side heat exchanger, with an integrated heat exchanger, and a burner for heating the hot water supply heat exchanger and the non-hot water supply side heat exchanger in common. It is widely applied to.
[0089]
【The invention's effect】
According to the first aspect of the invention, during the operation in the detection mode for determining whether or not the non-hot water supply side circulation passage is flowing, the burner is experimentally burned to drive the circulation pump after the combustion is stopped and detected after the circulation pump is driven. The temperature of the non-hot water supply side circulation passage is based on the detected temperature data of the hot water supply heat exchanger hot water temperature detecting means and the non-hot water supply side flow presence / absence judgment data based on the change form of the hot water supply heat exchanger hot water temperature given in advance. Since the presence or absence of the flow of the medium is judged, flow detection means such as a running water switch is provided in the non-hot water circulation path such as the recirculation circulation path to detect the presence or absence of the heat medium in the non-hot water circulation path. Unlike the case where it does, it can detect correctly the presence or absence of the flow of the heat medium of a non-hot-water supply side circulation path, without being influenced by the dust etc. in the heat medium of a non-hot-water supply side circulation path.
[0090]
According to the second invention, the detection data of the hot water heat exchanger hot water temperature detection means obtained in the same manner as in the first invention, the hot water heat exchanger hot water temperature information given in advance, and the non-hot water supply side circulation are obtained. Since the circulation flow rate of the heat medium in the non-hot water supply side circulation passage is detected based on the relationship data corresponding to the circulation flow rate of the heat medium in the passage and the temperature of the heat medium in the non-hot water supply side circulation passage. Unlike the case of the first embodiment, unlike the case where a flow rate sensor or the like is provided in the non-hot water supply side circulation passage to detect the circulation flow rate of the heat medium in the non-hot water supply side circulation passage, the non-hot water supply side circulation passage such as bath hot water is used. Therefore, it is possible to accurately detect the circulation flow rate of the heat medium in the non-hot water supply side circulation passage without being influenced by dust in the heat medium. Can be detected.
[0091]
As described above, according to the present invention, in order to accurately detect the presence or absence of the flow of the heat medium in the non-hot water supply side circulation passage, in a single can two-water water heater, a conventional non-hot water supply side circulation passage is provided. It is also possible to omit the heat medium flow detection means such as a flowing water switch, and the system configuration of the hot water heater can be simplified correspondingly, and the cost can be reduced.
[0092]
According to the second invention, as described above, the flow rate of the heat medium circulating in the non-hot water supply side circulation passage can be accurately detected. It is possible to accurately determine the heat absorption ratio between the heat exchanger side and the hot water supply heat exchanger side, and based on the calculated heat absorption ratio, the combustion control during simultaneous combustion of non-hot water supply side combustion and hot water supply combustion can be performed accurately. can do.
[0093]
In addition, the above-mentioned flow presence / absence judgment data and hot water heat exchanger temperature information of related data are given by the hot water temperature falling gradient of the hot water heat exchanger after the burner combustion stop by the test burner / pump control unit, or the test It is given by the hot water temperature of the hot water heat exchanger when a predetermined reference time has passed since the burner / pump controller for driving the circulating pump, or the test burner / pump controller drives the circulating pump. The non-hot water supply side is given by the time from when the hot water temperature of the hot water supply heat exchanger is lowered to a predetermined reference temperature or by the peak temperature of the hot water temperature of the hot water heat exchanger after the burner combustion is stopped. It is possible to easily and accurately determine whether or not the heat medium flows in the circulation path and detect the circulation flow rate.
[0094]
Furthermore, the non-hot water supply side circulation passage is a reheating circulation passage, the non-hot water supply side heat exchanger is a reheating heat exchanger, the heat medium circulating in the reheating circulation passage is hot water, and the operation on the hot water supply side is a bath retreat. According to the present invention, which has been operated in a fired manner, it is possible to provide a single can / two water bath hot water heater that exhibits the excellent effects as described above.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a control configuration of a first embodiment of a single can / two water heater according to the present invention.
[Fig. 2] In a single-can two-water bath water heater, the hot water temperature change mode of the hot water supply heat exchanger when the burner is experimentally burned and the circulation pump is driven simultaneously with the combustion stop, It is a graph shown by comparing with and without a flow.
FIG. 3 is a flowchart showing a detection mode operation for determining whether or not there is a water flow in the recirculation circulation passage of the first embodiment.
FIG. 4 is a block diagram showing a control configuration of a second embodiment of the single can / two water heater according to the present invention.
FIG. 5 shows the hot water temperature change pattern of the hot water heat exchanger when the burner is experimentally burned and the circulation pump is driven at the same time as the combustion is stopped in a single can two water heater. It is a graph which compares and shows by the magnitude of flow volume.
FIG. 6 is a graph showing an example of relational data between hot water heat exchanger hot water temperature information and hot water circulation flow rate in a recirculation circulation path given to the second embodiment.
FIG. 7 is a flowchart showing a hot water circulation flow rate detection mode operation of a recirculation circulation passage according to the second embodiment.
FIG. 8 is a flowchart showing a detection mode operation for determining whether or not there is a water flow in the recirculation circulation passage in another embodiment of the single can / two water heater according to the present invention.
FIG. 9 is a flowchart showing a detection mode operation for determining whether or not there is a water flow in the recirculation circulation passage in still another embodiment of the single can / two water heater according to the present invention.
FIG. 10 is a system configuration diagram showing a model example of a single can / two water bath hot water heater.
FIG. 11 is a main part explanatory view showing a system configuration example of a heating water heater as an example of a single can two water channel water heater.
[Explanation of symbols]
3 Hot water supply heat exchanger
20 Circulation pump
24 Recirculation passage
33 Hot water hot water temperature sensor
37 Bath temperature sensor
43 Test burner / pump controller
44 Data storage
45 Recirculation passage water flow judgment section
46 Hot water circulation flow rate detection means

Claims

A hot water supply heat exchanger that heats water guided from the water supply passage and supplies hot water to the hot water supply passage, and a non-hot water supply side circulation passage equipped with a circulation pump that heats the heat medium circulating in the non-hot water supply side circulation passage A hot water supply side heat exchanger, the hot water supply heat exchanger and the non-hot water supply side heat exchanger are integrated, and a burner for heating the hot water supply heat exchanger and the non-hot water supply side heat exchanger in common is provided. In a single can two-way water heater, the hot water heat exchanger hot water temperature detecting means for detecting the hot water temperature of the hot water heat exchanger and the burner on a trial basis when operating in the detection mode for determining whether or not the non-hot water supply side circulation passage is flowing. A burner pump for test that burns and stops the burner combustion when the temperature detected by the hot water supply heat exchanger hot water detection means reaches a predetermined temperature and drives the circulation pump after the burner combustion stops Control unit The non-hot water supply side flow presence / absence judgment data for judging the presence / absence of the flow of the heat medium in the non-hot water supply side circulation passage is given in advance based on the change form of the hot water supply heat exchanger hot water temperature. Presence or absence of flow of the heat medium in the non-hot water supply side circulation passage based on the data and temperature data detected by the hot water supply heat exchanger hot water temperature detection means detected after the circulation pump is driven by the test burner / pump control unit One can two water channel water heater provided with the non-hot water supply side circulation passage flow judgment part which judges the above.

Non-hot water supply side flow presence / absence judgment data is given by the hot water temperature falling gradient of the hot water heat exchanger after the burner combustion stop by the test burner / pump control unit. Using the gradient as a reference gradient, the reference gradient and the hot water temperature falling gradient of the detected temperature data of the hot water supply heat exchanger hot water detection means after the burner combustion stop is compared, and the hot water temperature falling gradient of the detected temperature data is When the gradient is smaller than the reference gradient, it is determined that there is no flow of the heat medium in the non-hot water supply side circulation passage, and when the falling temperature gradient of the detected temperature data is equal to or higher than the reference gradient, the flow of the heat medium in the non-hot water supply side circulation passage is It is judged that there is one can two-way water heater.

Non-hot water side flow presence / absence judgment data is given by the hot water temperature of the hot water heat exchanger when a predetermined reference time has elapsed after the test burner / pump control unit has driven the circulation pump. The passage flow determination unit uses the hot water temperature of the hot water heat exchanger as a determination reference hot water temperature, and the detected temperature of the hot water supply heat exchanger hot water detection means when the reference time has elapsed since the reference pump temperature and the circulation pump are driven. When the detected temperature is higher than the determination reference hot water temperature, it is determined that there is no flow of the heat medium in the non-hot water supply side circulation passage, and when the detected temperature is lower than the determination reference hot water temperature, the non-hot water supply is determined. The single can two-way water heater according to claim 1, wherein it is determined that there is a flow of the heat medium in the side circulation passage.

Non-hot-water side flow presence / absence judgment data is given by the time from when the test burner / pump control unit drives the circulation pump until the hot water temperature of the hot water heat exchanger drops to a predetermined reference temperature. The circulation passage flow determination unit uses this time as a determination reference time and compares the determination reference time with the detection time from when the circulating pump is driven until the temperature detected by the hot water supply heat exchanger hot water temperature detecting means falls to the reference temperature. When the detection time is longer than the determination reference time, it is determined that there is no flow of the heat medium in the non-hot water supply side circulation passage. When the detection time is within the determination reference time, the heat of the non-hot water supply side circulation passage is determined. The single can two-way water heater according to claim 1, wherein it is determined that there is a medium flow.

The test burner pump control unit is configured to drive the circulation pump simultaneously with the burner combustion stop, and the non-hot water supply side flow presence / absence judgment data is given by the hot water peak temperature of the hot water heat exchanger after the burner combustion stop. The hot water supply side circulation passage flow judgment unit compares the judgment reference temperature with the peak temperature of the detected temperature data of the hot water heat exchanger hot water temperature detection means using this peak temperature as the judgment reference temperature, and the peak temperature of the detected temperature data is judged as described above. When the temperature is higher than the reference temperature, it is determined that there is no flow of the heat medium in the non-hot water supply side circulation passage. When the peak temperature of the detected temperature data is equal to or lower than the determination reference temperature, the flow of the heat medium in the non-hot water supply side circulation passage is determined. It is judged that there is one can two-way water heater.

A hot water supply heat exchanger that heats water guided from the water supply passage and supplies hot water to the hot water supply passage, and a non-hot water supply side circulation passage equipped with a circulation pump that heats the heat medium circulating in the non-hot water supply side circulation passage A hot water supply side heat exchanger, the hot water supply heat exchanger and the non-hot water supply side heat exchanger are integrated, and a burner for heating the hot water supply heat exchanger and the non-hot water supply side heat exchanger in common is provided. Hot water heat exchanger hot water temperature detecting means for detecting the hot water temperature of the hot water heat exchanger, and non-hot water supply side circulation passage temperature for detecting the temperature of the heat medium circulating in the non-hot water supply circulation passage The operation of the detection means and the detection mode of the circulating flow rate of the heat medium in the non-hot water supply side circulation passage is caused to testly burn the burner so that the detected temperature of the hot water heat exchanger hot water temperature detection means becomes a predetermined temperature. When it reaches the burner combustion A test burner / pump controller for driving the circulation pump after the burner combustion is stopped, and the relationship data between the hot water heat exchanger hot water temperature information and the circulation flow rate of the heat medium in the non-hot water supply side circulation passage is not The hot water supply heat exchanger hot water temperature detecting means which is given in advance corresponding to the temperature of the heat medium circulating in the hot water supply side circulation passage and is detected after the relational data and driving of the circulation pump by the test burner / pump control unit Non-hot water supply side for detecting the circulating flow rate of the heat medium in the non-hot water supply side circulation passage based on the detected temperature data of the non-hot water supply side circulation passage temperature detecting means and the temperature of the heat medium in the non-hot water supply side circulation passage A can and two-water channel water heater provided with a circulating flow rate detecting means.

The hot water temperature information of the hot water supply heat exchanger in the related data is given by the hot water temperature falling gradient of the hot water heat exchanger after the burner combustion stop by the test burner / pump control unit. Comparing the descending slope with the hot water temperature falling slope of the detected temperature data of the hot water heat exchanger hot water detecting means after the burner combustion stop, the circulating flow rate of the heat medium in the non-hot water supply side circulation passage is detected. The one-can two-water channel water heater according to claim 6.

The hot water information of the hot water heat exchanger in the related data is given by the hot water temperature of the hot water heat exchanger when a predetermined reference time has elapsed since the test burner / pump control unit activated the circulation pump. The side circulation flow rate detecting means compares the hot water temperature of the hot water heat exchanger with the detected temperature of the hot water heat exchanger hot water temperature detecting means when the reference time has elapsed after driving the circulation pump. The single can two-way water heater according to claim 6, wherein the circulation flow rate of the heat medium in the passage is detected.

The hot water information of the hot water heat exchanger in the related data is given by the time from when the test burner / pump control unit drives the circulation pump until the hot water temperature of the hot water heat exchanger drops to a predetermined reference temperature. The hot water supply side circulation flow rate detection means compares this time with the detection time from when the circulating pump is driven to when the detected temperature of the hot water heat exchanger hot water temperature detection means falls to the reference temperature. The canned two-way water heater according to claim 6, wherein the circulating flow rate of the heat medium is detected.

The test burner / pump control unit is configured to drive the circulation pump at the same time as the burner combustion stop, and the hot water heat exchanger temperature information in the relevant data is given by the hot water peak temperature of the hot water heat exchanger after the burner combustion stop. The non-hot water supply side circulation flow rate detection means detects the circulation flow rate of the heat medium in the non-hot water supply side circulation passage by comparing this peak temperature with the peak temperature of the detected temperature data of the hot water supply heat exchanger hot water temperature detection means. The single can two-way water heater as defined in claim 6.

The test burner / pump control unit stops the burner combustion when a predetermined time has elapsed since the burner was started to start test combustion during the detection mode operation, and drives the circulation pump after the burner combustion stopped. The one-can two-water channel water heater according to any one of claims 1 to 10, wherein the single-can two-water heater is configured to be configured.

The non-hot water supply side circulation passage is a reheating circulation passage, the non-hot water supply side heat exchanger is a reheating heat exchanger, the heat medium circulating in the reheating circulation passage is hot water, and the operation on the non-hot water supply side is a reheating bath. The single can two-way water heater according to any one of claims 1 to 11, wherein the can is operated.