JP3622189B2

JP3622189B2 - Bathtub temperature detector

Info

Publication number: JP3622189B2
Application number: JP05539797A
Authority: JP
Inventors: 良彦田中; 康雄中西; 信之江本; 公明朝野
Original assignee: Noritz Corp
Current assignee: Noritz Corp
Priority date: 1997-02-25
Filing date: 1997-02-25
Publication date: 2005-02-23
Anticipated expiration: 2017-02-25
Also published as: JPH10238855A

Description

【０００１】
【発明の属する技術分野】
本発明は、一缶体内に二経路の熱交換器を備え、一基のバーナで浴槽の湯と給湯との二経路の熱交換器を加熱する所謂一缶二経路式の循環加熱装置において、浴槽の湯温を検出する浴槽湯温検出装置に関する。
【０００２】
【従来の技術】
従来、一缶二経路式の循環加熱装置においては、浴槽に通じる配管内に温度センサを設け、該配管内の湯温を検出することによって浴槽内の湯温を検出していた。
ところが、上記従来の浴槽湯温検出方法においては、直接浴槽内の湯温を測定するものではなく、浴槽内の湯温と、温度センサの設置位置の湯温とが一致しない状態が生じ、浴槽内の湯温を適切に測定することができないという問題があった。
【０００３】
この問題を解決するために、浴槽に通じる配管内に温度センサを設け、該配管内の現在湯温を検出して、前回検出した湯温データと比較し、前回検出した湯温よりも現在湯温が低い場合に、前回検出した湯温を誤検出したデータであると判定し、現在湯温を浴槽温度として更新する浴槽温度検出装置が提案されている。
【０００４】
【発明が解決しようとする課題】
しかしながら、上記従来の浴槽湯温検出装置においては、以下に述べるような問題があった。
一缶二経路式の循環加熱装置に上記従来の浴槽湯温検出装置を適用した場合、一方の経路の単使用時には加熱能力が十分であるから問題は無いものであるが、二経路を同時使用すると、給湯側に加熱能力を取られて浴槽に連通する側の経路に対する加熱能力が不足し、現在湯温が前回検出した湯温より低くなり、前回検出した湯温を誤検出したデータであると判定するという問題があった。
【０００５】
本発明の目的は、一缶体内に二経路の熱交換器を備え、一基のバーナで加熱する一缶二経路式の循環加熱装置において、浴槽湯温の誤検出の誤判定を防ぐことのできる浴槽湯温検出装置を提供することである。
【０００６】
【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の浴槽湯温検出装置は、一缶体内に二経路の熱交換器と一基のバーナを備えた一缶二経路式の循環加熱装置において、風呂側循環回路に風呂温度センサを設け、該風呂温度センサの検出した現在湯温が、所定時間前に検出して比較風呂温度データとして記憶している前回検出湯温よりも低い場合は、現在湯温を比較風呂温度データとして更新して記憶する風呂温度センサ異常検出動作を行う浴槽湯温検出装置において、風呂と給湯の同時運転が開始された時に、風呂温度センサ異常検出動作を停止することにより、風呂加熱運転中に給湯運転が行われている場合に、ＮＧカウンタをリセットして風呂温度センサの異常検出動作を停止させるから、風呂温度センサの異常の誤検出を防止することができる。
また、一缶体内に二経路の熱交換器と一基のバーナを備えた一缶二経路式の循環加熱装置において、風呂側循環回路に風呂温度センサを設け、該風呂温度センサの検出した現在湯温が、所定時間前に検出して比較風呂温度データとして記憶している前回検出湯温よりも低い場合は、現在湯温を比較風呂温度データとして更新して記憶する風呂温度センサ異常検出動作を行う浴槽湯温検出装置において、風呂と給湯の同時運転が開始された時に、給湯運転が停止されるまで風呂温度センサ異常検出動作を中断することにより、給湯及び風呂の同時使用で、風呂加熱能力が低下しても、風呂温度センサ異常検出の誤動作を防ぐことができるとともに、給湯運転が停止すると、第２所定時間ｔ_２を計測するタイマをリセットし、比較風呂温度データを再び検出するが、ＮＧカウンタをリセットしないことで、正確に且つ速やかに風呂温度センサの異常を検出できる。
さらに、一缶体内に二経路の熱交換器と一基のバーナを備えた一缶二経路式の循環加熱装置において、風呂側循環回路に風呂温度センサを設け、該風呂温度センサの検出した現在湯温が、所定時間前に検出して比較風呂温度データとして記憶している前回検出湯温よりも低い場合は、現在湯温を比較風呂温度データとして更新して記憶する風呂温度センサ異常検出動作を行う浴槽湯温検出装置において、風呂と給湯の同時運転が開始された時に、給湯側の運転による風呂側加熱能力が低下が大きい場合に、風呂温度センサ異常検出動作を停止することにより、同時使用中に風呂側加熱能力が低下した場合にのみ風呂温度センサ異常検出動作を停止させて誤検出を防止する一方、風呂側加熱能力が低下しない場合は風呂温度センサ異常検出動作を継続して、速やか且つ正確な風呂温度センサ異常検出を実行することができる。
また、同時使用中に風呂側加熱能力が低下した場合に風呂温度センサ異常検出動作を停止させて誤検出を防止することができる。
【０００７】
【発明の実施の形態】
図を参照して本発明の実施例を説明する。
図６において、本発明を適用する一缶二経路一バーナ形式の循環加熱装置の概略構成を説明すると、循環加熱装置１は、給湯用熱交換器２と、風呂用熱交換器３と、バーナノズル４、点火装置５及びファン６とを有するオイルバーナとを備えている。
【０００８】
給湯用熱交換器２には、給湯入水路７と、給湯用カランに接続される給湯出湯路８とがそれぞれ連通されており、給湯入水路７には、入水量Ｑｃを検出する給湯入水量センサ９及び入水温度Ｔｃを検出する入水温度センサ１０が設けられ、給湯出湯路８には出湯量Ｑｏを調節する出湯量調整弁１１及び出湯温度Ｔｏを検出する出湯湯温センサ１２が設けられている。
給湯入水路７の水量センサ９及び入水温度センサ１０の設置箇所より上流側位置と、給湯出湯路８の出湯量調整弁１１及び出湯湯温センサ１２の設置箇所より上流側位置即ち給水源側位置とに、それぞれ両端が接続開口される給湯バイパス路１３が設けられており、該給湯バイパス路１３にはバイパス水量を調節するバイパス調整弁１４が設置されている。
【０００９】
風呂用熱交換器３には、一端が浴槽に接続開口され、浴槽内の湯を循環加熱装置１に送る風呂戻り管路１５と、一端が浴槽に接続開口され、循環加熱装置１で加熱された湯を浴槽に送る風呂往き管路１６とがそれぞれ接続されて風呂側循環回路が形成されており、風呂戻り管路１５には、循環ポンプ１９、風呂温度センサ２０及び水流スイッチ２１が上流側即ち浴槽側から順に設けられ、風呂温度センサ２０と水流スイッチ２１の間と、風呂往き管路１６とに、それぞれ両端が接続開口され、逆止弁２４を有する風呂バイパス路１８が設けられている。
【００１０】
給湯出湯路８の出湯量調整弁１１及び出湯湯温センサ１２の設置箇所より下流側位置と、風呂往き管路１６の風呂バイパス路１８分岐位置より上流側位置即ち循環加熱装置１側の位置とに、両端が接続開口された落とし込み管路１７が設けられており、落とし込み管路１７には、逆止弁２２，２３、落とし込み水量センサ２４、落とし込み電磁弁２５及び真空破壊弁２６が設けられている。
【００１１】
動作について説明すると、給湯運転時には、給湯カランを開くと、給湯入水路７から給湯用熱交換器２を経て給湯出湯路８への給湯加熱路が形成され、給湯入水路７から給湯用熱交換器２への入水量を給湯入水量センサ９で、入水温度を入水温度センサ１０で検出し、その検出データに基づいて、出湯量調整弁１１の開度並びにバイパス水量を調節するバイパス調整弁１４の開度を調節して、給湯出湯路８からの出湯湯温を調節する。
【００１２】
浴槽に湯を補給する落とし込み運転の場合は、給湯カランは閉じたままで落とし込み電磁弁２５を開くと、給湯入水路７、給湯用熱交換器２、給湯出湯路８、落とし込み管路１７、風呂往き管路１６で落とし込み加熱路が形成され、給湯用熱交換器２で加熱された給湯出湯路８からの湯を、落とし込み管路１７を介して風呂往き管路１６に導き、浴槽に供給する。
浴槽内の水位が空焚きの恐れのない第１所定値（例えば、接続金具の開口を覆う水位）に達すると、浴槽内の湯温が低い場合は、落とし込み運転を継続しながら、後述の風呂追焚運転を開始する。
【００１３】
浴槽内の水位が十分な第２所定値（例えば、浴槽の上縁から１０〜１５ｃｍ）に達すると、落とし込み電磁弁２５が閉じられて落とし込み運転が停止され、浴槽内の湯温が低くなると、浴槽内の湯を追い焚きする風呂追焚運転が開始される。風呂追焚運転においては、落とし込み電磁弁２５が閉じられて循環ポンプ１９の運転が開始され、水流スイッチ２１が浴槽の湯の循環を検出し、風呂戻り管路１５に設けられた風呂温度センサ２０が、湯温Ｔｅが設定温度Ｔｓ以下であることを検出すると、オイルバーナが燃焼を開始する。
【００１４】
次に、風呂温度センサ２０の異常検出動作について説明する。
図１において、第１実施例を説明すると、風呂保温或いは風呂昇温の操作スイッチをオンする又はオンしている（ステップＳ１）時に、給湯入水路７の入水量Ｑｃを検出する給湯入水量センサ９の検出データにより、給湯側に最低必要流量（ＭＯＱ）以上の通水が行われているか、即ち給湯が行われているか確認し（ステップＳ２）、ＭＯＱ以上の入水量Ｑｃ（ＭＯＱ≦Ｑｃ）である即ち給湯が行われている場合は、不都合な湯温検出状態である回数をカウントするＮＧカウンタをリセットする（ステップＳ３）。
ここで、ＮＧカウンタは、湯温検出状態が不都合である（例えば、バーナが燃焼しているのに、風呂温度センサ２０の検出する湯温Ｔｅが前回検出湯温Ｔｂより低下している）ことが発生した回数を所定時間毎にカウント（ＮＧカウント）するものである。
【００１５】
これは、ＭＯＱ以上の入水量Ｑｃ（ＭＯＱ≦Ｑｃ）である即ち給湯が行われている場合は、循環加熱装置１の加熱能力が、給湯用熱交換器２を加熱するのに大きく摂られることになり、風呂用熱交換器３の加熱量が不足し、上述のバーナが燃焼しているのに、風呂温度センサ２０が正常であるにも拘らず、その検出する湯温Ｔｅが前回検出湯温Ｔｂより低下する等の不都合を生じる恐れがあるため、ＮＧカウンタをリセットするものである。
【００１６】
入水量ＱｃがＭＯＱ未満（Ｑｃ＜ＭＯＱ）である場合は、給湯が行われていないと判断して後述する通常の風呂温度センサ異常検出動作を実行し（ステップＳ４）、ＮＧカウンタが所定カウント数Ｎ（例えば、３）になる（ステップＳ５）と風呂温度センサ２０が異常であると判定する（ステップＳ６）。
【００１７】
図２のフローチャートを参照して通常の風呂温度センサ異常検出動作（ステップＳ４）を説明すると、通常の風呂温度センサ異常検出動作に入ると、循環ポンプ１９を運転し（ステップＳ７）、水流スイッチ２１のオンによって循環ポンプ１９の運転を確認するとともに、水流スイッチ２１のオンから第１所定時間ｔ_１（例えば、２５秒間）継続した、即ち循環ポンプ１９の運転が第１所定時間ｔ_１（２５秒間）継続したことを確認し（ステップＳ８）、風呂温度センサ２０によって比較風呂温度データとして湯温Ａ_０（前述の前回検出湯温Ｔｂ）を検出する（ステップＳ９）。
なお、水流スイッチ２１を備えていない場合は、直接循環ポンプ１９が運転されている時間を計測する。
【００１８】
湯温Ａ_０の検出後第２所定時間ｔ_２（例えば、５分間）経過（ステップＳ１０）後、現在風呂温度データとして現在湯温Ａ_１（前述の湯温Ｔｅ）を検出する（ステップＳ１１）。
比較風呂温度データ（前回湯温Ａ_０）と現在風呂温度データ（現在湯温Ａ_１）とを比較し（ステップＳ１２）、比較風呂温度データ（前回湯温Ａ_０）より現在風呂温度データ（現在湯温Ａ_１）が低い（Ａ_０＞Ａ_１）場合には、誤検出と判断して比較風呂温度データを現在湯温Ａ_１に更新する（ステップＳ１３）。
【００１９】
この比較風呂温度データ（前回湯温Ａ_０）より現在風呂温度データ（現在湯温Ａ_１）が低い（Ａ_０＞Ａ_１）状態は、正常な状態ではないものであるから、ＮＧカウンタにＮＧカウントを１カウントする（ステップＳ１４）。
ＮＧカウンタが所定カウント数Ｎ（例えば、３）に達すると（ステップＳ１５）、風呂温度センサ２０が異常であると判定する（ステップＳ１６）。
【００２０】
ＮＧカウンタが所定カウント数Ｎ（３）に達していない（ステップＳ１５）時は、比較風呂温度データの計測（ステップＳ９）直後の状態に戻し、第２所定時間ｔ_２（５分間）経過（ステップＳ１０）後、現在風呂温度データとして現在湯温Ａ_２を検出し（ステップＳ１１）、比較風呂温度データ（前回湯温Ａ_１）と現在風呂温度データ（現在湯温Ａ_２）を比較し（ステップＳ１２）、比較風呂温度データ（前回湯温Ａ_１）より現在風呂温度データ（現在湯温Ａ_２）が低い（Ａ_１＞Ａ_２）場合には、比較風呂温度データを現在湯温Ａ_２に更新する（ステップＳ１３）とともに、ＮＧカウントを１カウントする（ステップＳ１４）。
以下、同様にして比較風呂温度データを更新する。
【００２１】
ステップＳ１２において、現在風呂温度データ（現在湯温Ａ_１）が比較風呂温度データ（前回湯温Ａ_０）以上（Ａ_０≦Ａ_１）である場合、その温度差が設定値ΔＴ（例えば、ΔＴ＝１度）未満である時（０°≦Ａ_１ーＡ_０＜ΔＴ、即ち０°≦Ａ_１ーＡ_０＜１°）は、正常な状態ではないと判定して、ＮＧカウンタにＮＧカウントを１カウントする（ステップＳ１４）。
現在風呂温度データ（現在湯温Ａ_１）と比較風呂温度データ（前回湯温Ａ_０）の差が設定値ΔＴ以上である（Ａ_１ーＡ_０≧ΔＴ、即ちＡ_１ーＡ_０≧１°）場合は、比較風呂温度データを現在湯温Ａ_１に更新し（ステップＳ１８）、ＮＧカウンタをリセットして（ステップＳ１９）比較風呂温度データの計測（ステップＳ９）直後の状態に戻す。
【００２２】
この構成により、風呂保温或いは風呂昇温の操作スイッチがオンした時、又はオンしている時即ち風呂加熱運転中に給湯運転が行われて風呂側加熱能力の低下が大きい場合には、ＮＧカウンタをリセットして風呂温度センサの異常検出動作を停止させるから、風呂温度センサの異常の誤検出を防止することができる。
【００２３】
図３において第２実施例を説明すると、ステップＳ７からステップＳ１９までは上述の通常の風呂温度センサ異常検出動作であり、比較風呂温度データとして湯温Ａ_０の検出後第２所定時間ｔ_２（例えば、５分間）が経過（ステップＳ１０）していない時に、ＭＯＱがオンして給湯運転が始まる（ステップＳ２０）と、ＭＯＱがオフして給湯運転が停止する（ステップＳ２１）まで、風呂温度センサ異常検出動作を停止する。
ＭＯＱがオフする即ち給湯運転が停止する（ステップＳ２１）と、第２所定時間ｔ_２を計測するタイマをリセットし（ステップＳ２２）、比較風呂温度データとして湯温Ａ_０を再び検出する（ステップＳ９）。
【００２４】
この構成によると、風呂の加熱運転が行われている最中にＭＯＱがオンして給湯運転が始まると、ＭＯＱがオフして給湯運転が停止するまで、風呂温度センサ異常検出動作を停止することにより、給湯及び風呂の同時使用で、風呂加熱能力が低下しても、風呂温度センサ異常検出の誤動作を防ぐことができる。
また、ＭＯＱがオフして給湯運転が停止すると、第２所定時間ｔ_２を計測するタイマをリセットし、比較風呂温度データとして湯温Ａ_０を再び検出するが、ＮＧカウンタをリセットしないことで、正確に且つ速やかに風呂温度センサの異常を検出できる。
【００２５】
図４において第３実施例を説明すると、ステップＳ７からステップＳ１８までは上述の通常の風呂温度センサ異常検出動作であり、比較風呂温度データとして湯温Ａ_０の検出後第２所定時間ｔ_２（例えば、５分間）が経過（ステップＳ１０）していない時に、ＭＯＱがオンして給湯運転が始まる（ステップＳ２０）と、給湯側入水温度Ｔｃが入水所定温度Ｂ以下であり（ステップＳ２３）、且つ現在風呂戻り湯温Ｔｅが風呂戻り所定温度Ｄ以上である（ステップＳ２４）場合は、第２所定時間ｔ_２を計測するタイマをリセットして（ステップＳ２２）、風呂温度センサ異常検出動作を停止させ、比較風呂温度データとして湯温Ａ_０を再び検出する（ステップＳ９）。
【００２６】
これは、風呂追焚運転と給湯運転の同時使用において、給湯と追焚との能力バランスが、給湯は、給湯側入水温度Ｔｃが低い、即ち給湯側入水温度Ｔｃが入水所定温度Ｂ以下である場合には吸熱しやすくなる、即ち吸熱量が大きくなり、追焚運転は、風呂戻り湯温Ｔｅが高い、即ち風呂戻り湯温Ｔｅが風呂戻り所定温度Ｄ以上である場合には吸熱しにくくなる、即ち吸熱量が小さくなる。
したがって、給湯側入水温度Ｔｃが入水所定温度Ｂ以下で、且つ風呂戻り湯温Ｔｅが風呂戻り所定温度Ｄ以上である場合には、風呂側加熱能力が低下するからである。
【００２７】
この構成によると、風呂追焚運転と給湯運転の同時使用において、給湯側入水温度Ｔｃが入水所定温度Ｂ以下で、且つ風呂戻り湯温Ｔｅが風呂戻り所定温度Ｄ以上である場合には、第２所定時間ｔ_２を計測するタイマをリセットして風呂温度センサ異常検出動作を停止させるものであるから、同時使用中に風呂側加熱能力が低下した場合にのみ風呂温度センサ異常検出動作を停止させて誤検出を防止する一方、風呂側加熱能力が低下しない場合は風呂温度センサ異常検出動作を継続して、速やか且つ正確な風呂温度センサ異常検出を実行することができる。
【００２８】
図５を参照して第４実施例を説明すると、ステップＳ７からステップＳ１９までは上述の通常の風呂温度センサ異常検出動作であり、比較風呂温度データとして湯温Ａ_０の検出後、第２所定時間ｔ_２（例えば、５分間）が経過（ステップＳ１０）していない時に、ＭＯＱがオンして給湯運転が始まる（ステップＳ２０）と、現在給湯号数Ｇａを次の式で算出する（ステップＳ２４）。
Ｇａ＝（Ｔｏ ─Ｔｃ）×Ｑｏ／２５
ここで、Ｔｏ：給湯側出湯温度
Ｔｃ：給湯側入水温度
Ｑｏ：給湯側出湯量
【００２９】
次に、現在風呂号数Ｇｂを次の式で算出する（ステップＳ２６）。
Ｇｂ＝Ｇｃ ─Ｇａ
但し、Ｇｃ：現在のバーナ出力号数（バーナの燃焼量から算出）
さらに、現在風呂号数Ｇｂを所定号数Ｇｓ（例えば、５号）と比較し（ステップＳ２７）、現在風呂号数Ｇｂが所定号数Ｇｓ（例えば、５号）より低い（Ｇｂ＜Ｇｓ）場合には、第２所定時間ｔ_２を計測するタイマをリセットして（ステップＳ２２）、風呂温度センサ異常検出動作を停止させ、比較風呂温度データとして湯温Ａ_０を再び検出する（ステップＳ９）。
【００３０】
この構成によると、現在のバーナ出力号数Ｇｃと、実際値である現在給湯号数Ｇａとから現在風呂号数Ｇｂを算出し、現在風呂号数Ｇｂが所定号数Ｇｓ（５号）未満の場合には、風呂温度センサ異常検出動作を停止させるから、同時使用中に風呂側加熱能力が低下した場合に風呂温度センサ異常検出動作を停止させて誤検出を防止することができる。
【００３１】
【発明の効果】
本発明は、上述のとおり構成されているから次に述べる効果を奏する。
一缶二経路式の循環加熱装置において、風呂側循環回路に風呂温度センサを設け、該風呂温度センサの検出した現在湯温が、所定時間前に検出して比較風呂温度データとして記憶している前回検出湯温よりも低い場合は、現在湯温を比較風呂温度データとして更新して記憶する風呂温度センサ異常検出動作を行う浴槽湯温検出装置において、風呂と給湯の同時運転が開始された時に、風呂温度センサ異常検出動作を停止することにより、風呂加熱運転中に給湯運転が行われている場合に、ＮＧカウンタをリセットして風呂温度センサの異常検出動作を停止させるから、風呂温度センサの異常の誤検出を防止することができる。
また、風呂と給湯の同時運転が開始された時に、給湯運転が停止されるまで風呂温度センサ異常検出動作を中断することにより、給湯及び風呂の同時使用で、風呂加熱能力が低下しても、風呂温度センサ異常検出の誤動作を防ぐことができるとともに、給湯運転が停止すると、第２所定時間ｔ_２を計測するタイマをリセットし、比較風呂温度データを再び検出するが、ＮＧカウンタをリセットしないことで、正確に且つ速やかに風呂温度センサの異常を検出できる。
さらに、風呂と給湯の同時運転が開始された時に、風呂側加熱能力が低下した場合に、風呂温度センサ異常検出動作を停止することにより、同時使用中に風呂側加熱能力が低下した場合にのみ風呂温度センサ異常検出動作を停止させて誤検出を防止する一方、風呂側加熱能力が低下しない場合は風呂温度センサ異常検出動作を継続して、速やか且つ正確な風呂温度センサ異常検出を実行することができる。
また、同時使用中に風呂側加熱能力が低下した場合に風呂温度センサ異常検出動作を停止させて誤検出を防止することができる。
【図面の簡単な説明】
【図１】本発明の第１実施例のフローチャートである。
【図２】本発明を適用する異常検出動作のフローチャートである。
【図３】本発明の第２実施例のフローチャートである。
【図４】本発明の第３実施例のフローチャートである。
【図５】本発明の第４実施例のフローチャートである。
【図６】本発明を適用する循環加熱装置の概略構成図である。
【符号の説明】
１循環加熱装置、２給湯用熱交換器、３風呂用熱交換器
４バーナノズル、６ファン、７給湯入水路、８給湯出湯路
１３給湯バイパス路、１５風呂戻り管路、１６風呂往き管路
１７落とし込み管路、１８風呂バイパス路、１９循環ポンプ
２０風呂温度センサ、２１水流スイッチ[0001]
BACKGROUND OF THE INVENTION
The present invention is a so-called one-can two-path circulation heating apparatus that includes a two-path heat exchanger in one can and heats the two-path heat exchanger of hot water and hot water in a bathtub with a single burner. The present invention relates to a bathtub hot water temperature detecting device for detecting a hot water temperature of a bathtub.
[0002]
[Prior art]
Conventionally, in a can and two-path circulation heating device, a temperature sensor is provided in a pipe leading to the bathtub, and the hot water temperature in the bathtub is detected by detecting the hot water temperature in the pipe.
However, in the above-described conventional bath water temperature detection method, the hot water temperature in the bathtub is not directly measured, and the hot water temperature in the bathtub does not match the hot water temperature at the installation position of the temperature sensor. There was a problem that the temperature of the hot water inside could not be measured properly.
[0003]
In order to solve this problem, a temperature sensor is provided in the pipe that leads to the bathtub, and the current hot water temperature in the pipe is detected and compared with the previously detected hot water temperature data. There has been proposed a bathtub temperature detection device that determines that the detected hot water temperature is erroneously detected data when the temperature is low and updates the current hot water temperature as the bathtub temperature.
[0004]
[Problems to be solved by the invention]
However, the conventional bath water temperature detecting device has the following problems.
When the above-mentioned conventional bath water temperature detector is applied to a single-can two-path circulating heating device, there is no problem because the heating capacity is sufficient when only one of the channels is used, but two channels are used simultaneously. Then, the heating capacity is taken by the hot water supply side and the heating capacity for the path communicating with the bathtub is insufficient, the current hot water temperature is lower than the previously detected hot water temperature, and the previously detected hot water temperature is erroneously detected data. There was a problem of judging.
[0005]
An object of the present invention is to prevent erroneous determination of erroneous detection of bath water temperature in a single-can two-path circulation heating device that includes a two-path heat exchanger in a single can and heats with a single burner. It is providing the bathtub hot-water temperature detection apparatus which can be performed.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a bath water temperature detection device of the present invention is a bath-side circulation circuit in a one-can two-pass circulation heating device provided with a two-pass heat exchanger and one burner in one can. If the current hot water temperature detected by the bath temperature sensor is lower than the previously detected hot water temperature detected and stored as comparative bath temperature data a predetermined time ago, the current hot water temperature is compared. In bath water temperature detection device that performs bath temperature sensor abnormality detection operation that is updated and stored as bath temperature data, bath heating is performed by stopping the bath temperature sensor abnormality detection operation when simultaneous operation of bath and hot water is started When the hot water supply operation is performed during operation, the NG counter is reset to stop the abnormality detection operation of the bath temperature sensor, so that erroneous detection of the abnormality of the bath temperature sensor can be prevented.
In addition, in a one-can two-path circulation heating device equipped with a two-path heat exchanger and one burner in a single can, a bath temperature sensor is provided in the bath-side circulation circuit, and the current detected by the bath temperature sensor When the hot water temperature is lower than the previously detected hot water temperature detected and stored as comparative bath temperature data a predetermined time ago, the bath temperature sensor abnormality detection operation that updates and stores the current hot water temperature as comparative bath temperature data When the bath and hot water simultaneous operation is started in the bathtub hot water temperature detection device, the bath temperature sensor abnormality detection operation is interrupted until the hot water operation is stopped. even reduced ability, it is possible to prevent malfunction of the bath temperature sensor abnormality detection, the hot-water supply operation is stopped, the timer for measuring a second predetermined time t ₂ is reset, compare bath temperature data However, the abnormality of the bath temperature sensor can be detected accurately and promptly by not resetting the NG counter.
Furthermore, in a single-can two-path circulation heating device equipped with a two-path heat exchanger and one burner in a single can, a bath temperature sensor is provided in the bath-side circulation circuit, and the current detected by the bath temperature sensor When the hot water temperature is lower than the previously detected hot water temperature detected and stored as comparative bath temperature data a predetermined time ago, the bath temperature sensor abnormality detection operation that updates and stores the current hot water temperature as comparative bath temperature data When the bath and hot water supply simultaneous operation is started in the bathtub hot water temperature detection device, the bath temperature sensor abnormality detection operation is stopped at the same time if the bath side heating capacity due to the hot water supply side operation is greatly reduced. The bath temperature sensor abnormality detection operation is stopped only when the bath side heating capacity is reduced during use to prevent false detection, while when the bath side heating capacity is not reduced, the bath temperature sensor abnormality detection operation is performed. Continuously, it is possible to perform quick and accurate bath temperature sensor abnormality detection.
Moreover, when the bath-side heating capability is reduced during simultaneous use, the bath temperature sensor abnormality detection operation can be stopped to prevent erroneous detection.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
In FIG. 6, a schematic configuration of a canned, two-path, and one-burner circulation heating apparatus to which the present invention is applied will be described. The circulation heating apparatus 1 includes a hot water supply heat exchanger 2, a bath heat exchanger 3, and a burner nozzle. 4. An oil burner having an ignition device 5 and a fan 6 is provided.
[0008]
The hot water supply heat exchanger 2 is connected to a hot water supply / intake channel 7 and a hot water supply / outflow channel 8 connected to the hot water supply curan, and the hot water supply / inflow channel 7 detects the amount of incoming hot water Qc. A sensor 9 and an incoming water temperature sensor 10 for detecting the incoming water temperature Tc are provided, and a hot water supply / outflow path 8 is provided with a hot water amount adjusting valve 11 for adjusting the outgoing hot water amount Qo and a hot water temperature sensor 12 for detecting the outgoing hot water temperature To. Yes.
A position upstream of the location where the water amount sensor 9 and the temperature sensor 10 are installed in the hot water supply inlet 7 and a location upstream of the location where the hot water outlet adjustment valve 11 and the hot water temperature sensor 12 are installed, ie, the location of the water supply source In addition, a hot water supply bypass passage 13 that is open at both ends is provided, and a bypass adjustment valve 14 that adjusts the amount of bypass water is installed in the hot water supply bypass passage 13.
[0009]
One end of the bath heat exchanger 3 is connected and opened to the bathtub, the bath return pipe 15 for sending hot water in the bath to the circulating heating device 1, and one end of the bath is connected to the bathtub and heated by the circulating heating device 1. A bath-side circulation circuit is formed by connecting a hot water supply pipe 16 for sending hot water to the bathtub, and a circulation pump 19, a bath temperature sensor 20, and a water flow switch 21 are upstream of the bath return pipe 15. That is, the bath bypass path 18 is provided in order from the bathtub side, and is open between the bath temperature sensor 20 and the water flow switch 21 and the bath outlet pipe line 16 at both ends and having a check valve 24. .
[0010]
A position downstream of the hot water supply / outlet channel 8 and the position of the hot water temperature sensor 12 and the upstream side of the bath bypass channel 18 branch position of the bath outlet pipe 16, that is, the position on the circulating heating device 1 side Further, a dropping pipe 17 having both ends connected to each other is provided, and the dropping pipe 17 is provided with check valves 22 and 23, a dropped water amount sensor 24, a dropping electromagnetic valve 25, and a vacuum breaking valve 26. Yes.
[0011]
In operation, when the hot water supply current is opened during hot water supply operation, a hot water supply heating path is formed from the hot water supply / intake path 7 through the hot water supply heat exchanger 2 to the hot water supply / outflow path 8 and the hot water supply / intake path 7 exchanges heat for hot water supply. A bypass adjustment valve 14 that detects the amount of water entering the vessel 2 with a hot water supply water amount sensor 9 and the incoming water temperature with a water temperature sensor 10 and adjusts the opening degree of the hot water amount adjustment valve 11 and the amount of bypass water based on the detected data. The hot water temperature from the hot water supply and hot water outlet 8 is adjusted.
[0012]
In the drop-down operation for supplying hot water to the bathtub, if the drop-off solenoid valve 25 is opened with the hot-water supply curl closed, the hot-water supply / intake channel 7, the hot-water heat exchanger 2, the hot-water supply / outlet channel 8, the drop-in conduit 17, and the bath A dropping heating path is formed in the pipe line 16, and hot water from the hot water supply / outflow path 8 heated by the hot water supply heat exchanger 2 is guided to the bath outlet pipe line 16 through the dropping pipe line 17 and supplied to the bathtub.
When the water level in the bathtub reaches a first predetermined value (for example, the water level covering the opening of the fitting) that does not cause airing, if the hot water temperature in the bathtub is low, the bath operation described below is continued while continuing the dropping operation. Start memorial operation.
[0013]
When the water level in the bathtub reaches a sufficient second predetermined value (for example, 10 to 15 cm from the upper edge of the bathtub), the dropping solenoid valve 25 is closed, the dropping operation is stopped, and the hot water temperature in the bathtub is lowered. The bath chasing operation that chases the hot water in the bathtub is started. In the bath memorial operation, the drop solenoid valve 25 is closed and the operation of the circulation pump 19 is started, the water flow switch 21 detects the circulation of the hot water in the bathtub, and the bath temperature sensor 20 provided in the bath return line 15. However, when it is detected that the hot water temperature Te is equal to or lower than the set temperature Ts, the oil burner starts combustion.
[0014]
Next, the abnormality detection operation of the bath temperature sensor 20 will be described.
Referring to FIG. 1, a first embodiment will be described. A hot water supply / inflow amount sensor for detecting the amount of water intake Qc in the hot water supply / inflow channel 7 when the operation switch for bath warming or bath temperature raising is turned on or on (step S1). 9, it is confirmed whether or not water flow exceeding the minimum required flow rate (MOQ) is performed on the hot water supply side, that is, whether or not hot water supply is performed (step S2), and the amount of incoming water Qc greater than MOQ (MOQ ≦ Qc) In other words, if hot water is being supplied, the NG counter that counts the number of times that the hot water temperature detection state is inconvenient is reset (step S3).
Here, the hot water temperature detection state of the NG counter is inconvenient (for example, although the burner is burning, the hot water temperature Te detected by the bath temperature sensor 20 is lower than the previously detected hot water temperature Tb). Is counted (NG count) every predetermined time.
[0015]
This is because when the incoming water amount Qc is equal to or greater than MOQ (MOQ ≦ Qc), that is, when hot water is being supplied, the heating capacity of the circulation heating device 1 is greatly consumed for heating the heat exchanger 2 for hot water supply. Even though the amount of heating of the heat exchanger 3 for the bath is insufficient and the above-mentioned burner is burning, the detected hot water temperature Te is the bath temperature sensor 20 detected in spite of the normal temperature of the bath temperature sensor 20. The NG counter is reset because there is a risk of inconvenience such as a drop from the temperature Tb.
[0016]
When the incoming water amount Qc is less than MOQ (Qc <MOQ), it is determined that hot water is not being supplied, and a normal bath temperature sensor abnormality detection operation described later is executed (step S4), and the NG counter is set to a predetermined count number. When N (for example, 3) is reached (step S5), it is determined that the bath temperature sensor 20 is abnormal (step S6).
[0017]
The normal bath temperature sensor abnormality detection operation (step S4) will be described with reference to the flowchart of FIG. 2. When the normal bath temperature sensor abnormality detection operation starts, the circulation pump 19 is operated (step S7), and the water flow switch 21 is operated. The operation of the circulation pump 19 is confirmed by turning on, and the first predetermined time t ₁ (for example, 25 seconds) has been continued since the water flow switch 21 is turned on. That is, the operation of the circulation pump 19 is performed for the first predetermined time t ₁ (25 seconds). ) After confirming that it has continued (step S8), the bath temperature sensor 20 detects the hot water temperature A ₀ (the previously detected hot water temperature Tb) as comparative bath temperature data (step S9).
If the water flow switch 21 is not provided, the time during which the circulation pump 19 is operated directly is measured.
[0018]
After elapse of a second predetermined time t ₂ (for example, 5 minutes) after the detection of the hot water temperature A ₀ (step S10), the current hot water temperature A ₁ (the aforementioned hot water temperature Te) is detected as the current bath temperature data (step S11). .
The comparison bath temperature data (previous hot water temperature A ₀ ) and the current bath temperature data (current hot water temperature A ₁ ) are compared (step S12), and the current bath temperature data (current hot water temperature A ₀ ) is compared with the comparative bath temperature data (previous hot water temperature A ₀ ). If the hot water temperature A ₁ ) is low (A ₀ > A ₁ ), it is determined that there is a false detection, and the comparative bath temperature data is updated to the current hot water temperature A ₁ (step S13).
[0019]
Since the current bath temperature data (current hot water temperature A ₁ ) is lower than the comparative bath temperature data (previous hot water temperature A ₀ ) (A ₀ > A ₁ ), it is not normal. The count is incremented by 1 (step S14).
When the NG counter reaches a predetermined count number N (for example, 3) (step S15), it is determined that the bath temperature sensor 20 is abnormal (step S16).
[0020]
When the NG counter has not reached the predetermined count number N (3) (step S15), it returns to the state immediately after the measurement of the comparative bath temperature data (step S9), and the second predetermined time t ₂ (5 minutes) has elapsed (step S10) after the current now detects the hot water temperature _{a 2} as bath temperature data (step S11), and compares the bath temperature data (previous hot water temperature _{a 1)} and compares the current bath temperature data (current water temperature _{a 2)} (step S12) If the current bath temperature data (current hot water temperature A ₂ ) is lower than the comparative bath temperature data (previous hot water temperature A ₁ ) (A ₁ > A ₂ ), the comparative bath temperature data is set to the current hot water temperature A ₂ . In addition to updating (step S13), the NG count is counted by 1 (step S14).
Thereafter, the comparative bath temperature data is updated in the same manner.
[0021]
In step S12, when the current bath temperature data (current hot water temperature A ₁ ) is equal to or higher than the comparative bath temperature data (previous hot water temperature A ₀ ) (A ₀ ≦ A ₁ ), the temperature difference is set to a set value ΔT (for example, ΔT = 1 degree) (0 ° ≦ A ₁ −A ₀ <ΔT, ie, 0 ° ≦ A ₁ −A ₀ <1 °), it is determined that the state is not normal, and the NG counter counts NG. Is counted by 1 (step S14).
The difference between the current bath temperature data (current hot water temperature A ₁ ) and the comparative bath temperature data (previous hot water temperature A ₀ ) is equal to or greater than the set value ΔT (A ₁ −A ₀ ≧ ΔT, that is, A ₁ −A ₀ ≧ 1 °). ), then updates the comparison bath temperature data to the current hot water temperature a ₁ (step S18), and resets the NG counter (step S19) measurement of the comparative bath temperature data (step S9) and returns to the state immediately after.
[0022]
With this configuration, when the bath warming or bath warming operation switch is turned on, or when it is turned on, that is, when the hot water supply operation is performed during the bath heating operation and the bath side heating capacity is greatly reduced, the NG counter Is reset and the abnormality detection operation of the bath temperature sensor is stopped, so that erroneous detection of the abnormality of the bath temperature sensor can be prevented.
[0023]
Referring to FIG. 3, the second embodiment will be described with reference to the normal bath temperature sensor abnormality detection operation from step S7 to step S19, and the second predetermined time t ₂ (after detection of the hot water temperature A ₀ as comparison bath temperature data). For example, when 5 minutes has not elapsed (step S10), the MOQ is turned on and the hot water supply operation is started (step S20), and the MOQ is turned off and the hot water supply operation is stopped (step S21). Stop the abnormality detection operation.
MOQ is namely hot-water supply operation is stopped off (the step S21), and a second predetermined time _{t 2} resets the timer for counting (step S22), and again detects the water temperature _{A 0} as compared bath temperature data (step S9 ).
[0024]
According to this configuration, when the MOQ is turned on and the hot water supply operation is started while the bath is being heated, the bath temperature sensor abnormality detection operation is stopped until the MOQ is turned off and the hot water supply operation is stopped. Thus, even if the hot water supply and bath are used at the same time, even if the bath heating capacity is reduced, it is possible to prevent malfunction of the bath temperature sensor abnormality detection.
Further, the MOQ is turned off hot-water supply operation is stopped, it resets the timer for measuring a second predetermined time t _2, but again detects the water temperature A ₀ as compared bath temperature data, without resetting the NG counter, Abnormalities in the bath temperature sensor can be detected accurately and promptly.
[0025]
Referring to FIG. 4, the third embodiment will be described with reference to the normal bath temperature sensor abnormality detecting operation from step S7 to step S18, and the second predetermined time t ₂ (after detection of the hot water temperature A ₀ as comparison bath temperature data). For example, when 5 minutes has not elapsed (step S10), when the MOQ is turned on and the hot water supply operation starts (step S20), the hot water supply side incoming water temperature Tc is equal to or lower than the incoming water predetermined temperature B (step S23), and If it is now bath return water temperature Te is a bath returns above a predetermined temperature D (step S24), and a timer for measuring a second predetermined time t ₂ is reset (step S22), and stops the bath temperature sensor abnormality detecting operation The hot water temperature _A0 is detected again as comparison bath temperature data (step S9).
[0026]
This is because the capacity balance between hot water supply and reheating is the same in simultaneous use of bath chase operation and hot water supply operation. In hot water supply, the hot water supply side incoming temperature Tc is low, that is, the hot water supply side incoming temperature Tc is lower than the predetermined incoming temperature B. In this case, the heat absorption becomes easy, that is, the amount of heat absorption becomes large, and the chasing operation becomes difficult to absorb heat when the bath return hot water temperature Te is high, that is, when the bath return hot water temperature Te is equal to or higher than the predetermined temperature D for bath return. That is, the endothermic amount is reduced.
Therefore, when the hot water supply side incoming water temperature Tc is equal to or lower than the incoming water predetermined temperature B and the bath return hot water temperature Te is equal to or higher than the bath return predetermined temperature D, the bath side heating capacity is lowered.
[0027]
According to this configuration, in the simultaneous use of the bath chase operation and the hot water supply operation, when the hot water supply side incoming water temperature Tc is equal to or lower than the incoming water predetermined temperature B and the bath return hot water temperature Te is equal to or higher than the predetermined bath return temperature D, since the timer for measuring a second predetermined time t ₂ is intended to stop the bath temperature sensor abnormality detection operation is reset, to stop the bath temperature sensor abnormality detecting operation only when the bath side heating capacity drops during simultaneous use If the bath-side heating capability does not decrease, the bath temperature sensor abnormality detection operation can be continued and the bath temperature sensor abnormality detection can be performed quickly and accurately.
[0028]
To explain the fourth embodiment with reference to FIG. 5, an above-described conventional bath temperature sensor abnormality detecting operation from the step S7 to the step S19, after the detection of the hot water temperature A ₀ as compared bath temperature data, the second predetermined When the time t ₂ (for example, 5 minutes) has not elapsed (step S10), when the MOQ is turned on and the hot water supply operation starts (step S20), the current hot water supply number Ga is calculated by the following equation (step S24). ).
Ga = (To−Tc) × Qo / 25
Here, To: hot water supply side hot water temperature Tc: hot water supply side incoming water temperature Qo: hot water supply side hot water output amount
Next, the current bath number Gb is calculated by the following equation (step S26).
Gb = Gc-Ga
However, Gc: Current burner output number (calculated from burner combustion amount)
Further, the current bath number Gb is compared with a predetermined number Gs (for example, No. 5) (step S27), and the current bath number Gb is lower than the predetermined number Gs (for example, No. 5) (Gb <Gs). to, a timer for measuring a second predetermined time t ₂ is reset (step S22), and the bath temperature sensor abnormality detecting operation is stopped, again to detect the water temperature a ₀ as compared bath temperature data (step S9).
[0030]
According to this configuration, the current bath number Gb is calculated from the current burner output number Gc and the current hot water supply number Ga, which is an actual value, and the current bath number Gb is less than the predetermined number Gs (5). In this case, since the bath temperature sensor abnormality detection operation is stopped, when the bath-side heating capability is reduced during simultaneous use, the bath temperature sensor abnormality detection operation can be stopped to prevent erroneous detection.
[0031]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
In a single-can two-path circulating heating device, a bath temperature sensor is provided in the bath-side circulation circuit, and the current hot water temperature detected by the bath temperature sensor is detected a predetermined time before and stored as comparative bath temperature data. When the temperature of the hot water is lower than the previously detected hot water temperature, the bath water temperature detecting device that detects the abnormal temperature of the bath temperature sensor that updates and stores the current hot water temperature as comparative bath temperature data is used when simultaneous operation of the bath and hot water is started. By stopping the bath temperature sensor abnormality detection operation, when the hot water supply operation is performed during the bath heating operation, the bath temperature sensor abnormality detection operation is stopped by resetting the NG counter. It is possible to prevent erroneous detection of abnormality.
In addition, when simultaneous operation of bath and hot water is started, by interrupting the bath temperature sensor abnormality detection operation until hot water operation is stopped, even if the bath heating capacity decreases due to simultaneous use of hot water and bath, it is possible to prevent malfunction of the bath temperature sensor abnormality detection, the hot-water supply operation is stopped, resets the timer for measuring a second predetermined time t _2, but again detects the comparison bath temperature data, it does not reset the NG counter Therefore, the abnormality of the bath temperature sensor can be detected accurately and promptly.
Furthermore, when the bath-side heating capacity is reduced when the simultaneous operation of the bath and hot water supply is started, the bath temperature sensor abnormality detection operation is stopped so that the bath-side heating capacity is reduced during simultaneous use. While the bath temperature sensor abnormality detection operation is stopped to prevent false detection, the bath temperature sensor abnormality detection operation should be continued and the bath temperature sensor abnormality detection operation performed promptly and accurately when the bath-side heating capacity does not decrease. Can do.
Moreover, when the bath-side heating capability is reduced during simultaneous use, the bath temperature sensor abnormality detection operation can be stopped to prevent erroneous detection.
[Brief description of the drawings]
FIG. 1 is a flowchart of a first embodiment of the present invention.
FIG. 2 is a flowchart of an abnormality detection operation to which the present invention is applied.
FIG. 3 is a flowchart of a second embodiment of the present invention.
FIG. 4 is a flowchart of the third embodiment of the present invention.
FIG. 5 is a flowchart of the fourth embodiment of the present invention.
FIG. 6 is a schematic configuration diagram of a circulating heating apparatus to which the present invention is applied.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Circulating heating apparatus, 2 Heat exchanger for hot water supply, 3 Heat exchanger for bath 4 Burner nozzle, 6 Fan, 7 Hot water supply / reception channel, 8 Hot water supply / discharge channel 13 Hot water bypass channel, 15 Bath return pipeline, 16 Bath outlet pipeline 17 Drop pipe, 18 Bath bypass, 19 Circulation pump 20 Bath temperature sensor, 21 Water switch

Claims

In a one-can two-path circulation heating device equipped with a two-path heat exchanger and one burner in a single can, a bath temperature sensor is provided in the bath-side circulation circuit, and the current hot water temperature detected by the bath temperature sensor However, if the detected hot water temperature is lower than the previously detected hot water temperature detected and stored as comparative bath temperature data before a predetermined time, a bath temperature sensor abnormality detection operation is performed to update and store the current hot water temperature as comparative bath temperature data. In the bathtub water temperature detection device, the bath temperature sensor abnormality detection operation is stopped when simultaneous operation of the bath and hot water supply is started.

In a one-can two-path circulation heating device equipped with a two-path heat exchanger and one burner in a single can, a bath temperature sensor is provided in the bath-side circulation circuit, and the current hot water temperature detected by the bath temperature sensor However, if the detected hot water temperature is lower than the previously detected hot water temperature detected and stored as comparative bath temperature data before a predetermined time, a bath temperature sensor abnormality detection operation is performed to update and store the current hot water temperature as comparative bath temperature data. In the bathtub hot water temperature detection device, when the simultaneous operation of the bath and hot water is started, the bath temperature sensor abnormality detection operation is interrupted until the hot water supply operation is stopped.

In a one-can two-path circulation heating device equipped with a two-path heat exchanger and one burner in a single can, a bath temperature sensor is provided in the bath-side circulation circuit, and the current hot water temperature detected by the bath temperature sensor However, if the detected hot water temperature is lower than the previously detected hot water temperature detected and stored as comparative bath temperature data before a predetermined time, a bath temperature sensor abnormality detection operation is performed to update and store the current hot water temperature as comparative bath temperature data. In the bathtub hot water temperature detecting device, when the simultaneous operation of the bath and hot water is started, the bath temperature sensor abnormality detecting operation is stopped when the bath side heating capability due to the hot water supply side operation is greatly reduced. Hot water temperature detector.