JP3754494B2

JP3754494B2 - Combustion equipment

Info

Publication number: JP3754494B2
Application number: JP13953296A
Authority: JP
Inventors: 寿久斉藤; 直行竹下; 和浩秋庭; 喜久雄岡本; 久恭渡辺; 享和泉沢; 健生山口
Original assignee: 株式会社ガスター
Priority date: 1996-05-09
Filing date: 1996-05-09
Publication date: 2006-03-15
Anticipated expiration: 2016-05-09
Also published as: JPH09303866A

Description

【０００１】
【発明の属する技術分野】
本発明は、給湯熱交換器を通る水量調節用の水量制御弁を備えた燃焼機器に関するものである。
【０００２】
【従来の技術】
図７には、燃焼機器として一般的な給湯器のシステム構成が示されている。同図において、燃焼室22内に設けられた給湯熱交換器２の入口側には給水通路の給水管３が接続されており、この給水管３には入水温を検出するサーミスタ等の入水温度センサ10と、入水量（給湯熱交換器の通水量）を検出する流量センサ９とが設けられている。給湯熱交換器２の出口側には給湯通路の給湯管４が接続され、この給湯管４の出口側には給湯栓１が設けられている。さらに、給湯管４には水量制御弁16と、出湯温を検出するサーミスタ等の出湯温度センサ11とが設けられている。
【０００３】
給湯熱交換器２の下方には給湯熱交換器２の加熱燃焼を行う給湯バーナ７、給湯バーナ７の点着火を行うイグナイタ電極18、着火を検知するフレームロッド電極19、および給湯バーナ７への燃焼空気の供給や排気（給湯バーナ燃焼の給排気）を行う燃焼ファン５が配設されており、燃焼ファン５の回転数を検出するファン回転センサ21が設けられている。給湯バーナ７のガス導入口にはガスノズルをガス導入口に対向させてノズルホルダ６が配置され、このノズルホルダ６に通じるガス管８にはガス供給量を開弁量によって制御する比例制御弁13と、ガス管路の開閉を行う元電磁弁12とが介設されている。なお、電磁弁20ａ，20ｂ，20ｃは給湯バーナ７のＡ，Ｂ，Ｃの燃焼面を切り換えるためのものである。
【０００４】
この種の給湯器には制御装置14が備えられており、この制御装置14にはリモコン15が接続され、このリモコン15には、図示されていない運転ボタンや給湯温度を設定するボタンや給湯設定温度の設定温度表示部が設けられている。制御装置14には燃焼制御部が設けられており、シーケンスプログラムを用いて給湯器の給湯動作を制御している。給湯栓１が開けられると、流量センサ９が入水量を検出して、その入水量がある一定以上（最低作動流量以上）になったなら、燃焼ファン５をオンする。そして、燃焼ファン５の回転が所定の回転領域に入ったときに、元電磁弁12、電磁弁20ａ（又は20ａ，20ｂ又は20ａ，20ｂ，20ｃ）および比例制御弁13を開けて給湯バーナ７へガスの供給を行い、イグナイタ電極18により点着火する動作を行う。
【０００５】
次に、フレームロッド電極19により、給湯バーナ７の着火を確認して、フィードフォワード制御（出湯温度センサ10で出湯温度を検出することなく、予め設定したガス量供給パターンに従って燃焼を行わせる制御方式）からＰＩＤ演算等によるフィードバック制御（出湯温度センサ10により出湯温度を検出し、出湯温度が設定温度に近づくようにＰＩＤ演算によりガス供給量、つまり、比例制御弁13の開弁量を制御する方式）へ移行する動作を行う。
【０００６】
湯の使用が終了して、給湯栓１が閉められると、流量センサ９により通水停止が検出され、この通水停止の検出信号を受けて、制御装置14は元電磁弁12を遮断して給湯バーナ７の燃焼を停止する。
【０００７】
なお、この種の給湯器において、給湯燃焼停止以降に、給湯熱交換器２の本体等に保有していた熱が給湯熱交換器２に残留している湯に徐々に伝搬していき、残留湯温が給湯設定温度よりもやや高くなる、いわゆる後沸き現象が生じるが、その後自然冷却されていくため、給湯燃焼停止時から再出湯開始までの待機時間が長くなると、給湯熱交換器２内の残留湯温が徐々に低下していく。そのため、この状態で、再出湯が行われ、このとき給湯栓１が全開状態であり、給湯熱交換器２に多量の冷たい水が入り込むと、図８の（ａ）に示すように、給湯熱交換器内湯温が急激に低下することになり、しかも、この多量の水を設定温度まで加熱するには給湯バーナ７の火力が追いつかないため、設定温度よりかなり低いぬるいアンダーシュートの湯が出るという現象が起こってしまう。
【０００８】
そこで、最近では、例えば前記待機時間が予め定めた設定時間（水量制御弁絞り量の切り換え時間）に達したときには、水量制御弁16を一定量に絞った状態で次の出湯に備えて待機させる方式のものが考えられている。このような給湯器においては、水量制御弁16が絞った状態であるので給湯熱交換器２には少量の水が入り込むため、図８の（ｂ）に示すように、給湯熱交換器２への入水による湯温の低下が緩やかになり、給湯熱交換器２内の湯温が設定温度以下となるまでの時間Ｔ_Aが長くなり、しかも、この少量の水は給湯栓１が開けられてから給湯熱交換器２を出るまでの間にフィードバック制御によって十分に設定温度まで加熱されることとなり、湯の使用者は不快感を感ずることなく、気持ちよく湯の使用ができる。
【０００９】
【発明が解決しようとする課題】
ところで、前記の如く、給湯器等の燃焼機器において、給湯燃焼停止以降に、給湯熱交換器２の本体等に保有していた熱による後沸きが生じるが、この後沸きの大きさや時間等は燃焼機器によって様々に異なるものである。例えば、図５には、給湯器の器具本体から外部へ導出された吸気延長管路52と排気延長管路53によって二重管構造に形成された延長筒51を備えた給湯器が示されているが、このような給湯器においては、延長筒51の長さ（吸気延長管路52と排気延長管路53の並設長さ）によって後沸きの大きさ等が異なることが知られている。
【００１０】
したがって、このような延長筒51を備えた燃焼機器において、前記の如く、待機時間が予め定められた設定時間に達したときに水量制御弁16を一定量に絞った状態で次の出湯に備えて待機させると、延長筒51の長さによっては、水量制御弁16の絞り量を大きくして待機する必要がないにも拘わらず水量制御弁16の絞り量を大きくしてしまい、結果的に使い勝手があまりよくない状態で使用されることになってしまったり、水量制御弁16の絞り量が十分ではなく、アンダーシュートの湯が出てしまうといった問題が生じた。
【００１１】
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、燃焼機器の器具本体から外部へ導出された吸気延長管路と排気延長管路の並設長さが長い場合にも短い場合にも給湯燃焼停止以降の再出湯時の出湯湯温安定化を図ることが可能であり、かつ、できるだけ使い勝手のよい燃焼機器を提供することにある。
【００１２】
【課題を解決するための手段】
上記目的を達成するために、本発明は次のような構成により課題を解決するための手段としている。すなわち、本第１の発明は、給湯熱交換器の加熱燃焼を行う給湯バーナと、給湯バーナ燃焼の給排気を行う燃焼ファンと、前記給湯熱交換器を通る水量を調節する水量制御弁とを備え、給湯燃焼停止時に水量制御弁の絞り量を予め定めた絞り量として待機して再出湯を行うタイプの燃焼機器において、吸気延長管路と排気延長管路の並設長さに応じ定められた水量制御弁絞り量制御データに基づいて、前記待機中の水量制御弁の絞り量を制御する弁絞り量制御手段が設けられていることを特徴として構成されている。
【００１３】
また、本第２の発明は、給湯熱交換器の加熱燃焼を行う給湯バーナと、給湯バーナ燃焼の給排気を行う燃焼ファンと、前記給湯熱交換器を通る水量を調節する水量制御弁とを備え、給湯燃焼停止時に水量制御弁の絞り量を予め定めた絞り量として待機して再出湯を行うタイプの燃焼機器において、燃焼機器の器具の本体から外部へ導出され燃焼ファンの駆動により外部の空気を器具内に取り込む吸気延長管路と、この吸気延長管路の近傍に並設され燃焼ファンの駆動により給湯バーナの排気を外部へ排出する排気延長管路とを有し、該吸気延長管路と排気延長管路の並設長さに応じ定められた水量制御弁絞り量制御データに基づいて、該吸気延長管路と排気延長管路の並設長さが長くなるにつれて前記再出湯に備えた待機中の水量制御弁の絞り量を小さくし並設長さが短くなるにつれて前記待機中の水量制御弁の絞り量を大きくする弁絞り量制御手段が設けられていることを特徴として構成されている。
【００１４】
また、前記水量制御弁絞り量制御データは給湯バーナの給湯燃焼停止から再出湯開始までの待機時間をパラメータとした水量制御弁絞り量の関数データによって与えられていること、前記弁絞り量制御手段は、給湯熱交換器への入水温を取り込んで該入水温が高くなるにつれて前記再出湯に備えた待機中の水量制御弁の絞り量を小さくし入水温が低くなるにつれて前記水量制御弁の絞り量を大きくする構成としたことも本第１、第２の発明の特徴的な構成とされている。
【００１５】
さらに、前記燃焼ファンが燃焼室の排気側に設けられ、この燃焼ファンの駆動により給湯バーナ燃焼の排気を吸い出す構成としたことも本第１、第２の発明の特徴的な構成とされている。
【００１６】
上記構成の本発明のように、吸気延長管路と排気延長管路とが並設されて設けられている燃焼機器においては、吸気延長管路を通る吸気空気が排気延長管路の排気熱風の熱を受け取って加熱され、例えばこの加熱された空気が給湯バーナ燃焼停止後に行われるポストパージ（燃焼停止後、燃焼室内の排気を外部へ排出するために燃焼ファンを駆動させる動作）によって給湯バーナを介して給湯熱交換器に吹き付けられると、給湯熱交換器の後沸きが大きくなる。
【００１７】
この後沸き量（後沸きの大きさや長さ等）は、吸気延長管路と排気延長管路の並設長さに応じて異なるものであり、この並設長さが長くなるに従って給湯熱交換器に吹き付けられる風の温度が高くなるために、並設長さが長いほど後沸き量が大きくなる。
【００１８】
上記構成の本発明においては、この吸気延長管路と排気延長管路の並設長さに応じて水量制御弁絞り量制御データが定められており、このデータに基づいて、例えば、吸気延長管路と排気延長管路の並設長さが長くなるにつれて再出湯に備えた待機中の水量制御弁の絞り量を小さくし、並設長さが短くなるにつれて待機中の水量制御弁の絞り量を大きくする制御を弁絞り量制御手段によって行うために、給湯熱交換器の後沸きの大きさに応じた水量制御弁の絞り量制御を行うことが可能となり、前記並設長さが長い場合にも短い場合にも再出湯湯温の安定化が図られ、かつ、水量制御弁を過剰に絞って待機することによる使い勝手の悪さが解消され、上記課題が解決される。
【００１９】
【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、従来例と同一名称部分には同一符号を付し、その重複説明は省略する。本実施形態例の燃焼機器は図５に示した延長筒51を備えた給湯器であり、この給湯器においては、燃焼ファン５が燃焼室22の排気側に設けられている。吸気延長管路52はこの燃焼ファン５の駆動により外部の空気を器具内に取り込むものであり、排気延長管路は燃焼ファン５の駆動により給湯バーナ燃焼の排気を外部へ排出するものであり、排気延長管路53は吸気延長管路52の内部に配設されている。吸気延長管路52は器具ケース26に取り付けられ、排気延長管路53は燃焼室22の排気側の排気管路55を介して燃焼室22に連通されている。
【００２０】
この給湯器においても、燃焼室22には給湯バーナ７が設けられており、給湯バーナ７より下方側の燃焼室形成壁には吸気孔23が形成されており、燃焼ファン17を回転駆動することにより、外部の空気を吸気延長管路52と、器具ケース15と、燃焼室側壁の空隙54と、上記空気孔23を介して給湯バーナ７へ供給し、給湯バーナ７の燃焼によって発生した排気を排気管路55と排気延長管路53を介して外部へ排出するように形成されている。
【００２１】
この給湯器の制御装置14には、図１に示すような、本実施形態例に特有な水量制御弁制御回路が設けられており、ファン回転モード切替手段34が接続されている。なお、本実施形態例の上記以外の構成は図７に示した給湯器と同様であるので、その説明は省略し、以下、上記水量制御弁制御回路について説明する。
【００２２】
この水量制御弁制御回路は、図１に示すように、燃焼制御部24、待機時間計測部29、弁絞り量制御手段28、データ格納部30、延長筒長さ検出部31を有して構成されており、上記ファン回転モード切替手段34に接続されている。
【００２３】
このファン回転モード切替手段34は、例えば、表１に示すように、延長筒51の長さＬに応じ段階的に予め定められたファン回転制御モードを、給湯器の施工時等に施工業者やサービスマン等が延長筒51の長さＬに基づいて切り換え設定するもので、制御装置14には予め定められたファン回転制御モード毎に与えられる図４に示すようなファン回転数と燃焼能力の関係を示すファン回転制御データが実験や演算等により求め与えられている。制御装置14はファン回転モード切替手段34に設定されたファン回転制御モードのファン回転制御データに基づき燃焼ファン５の回転制御を行って、延長筒51の長さＬに応じて変化する延長筒51の管路抵抗の影響を受けずに給湯バーナ７の燃焼能力に見合った風量を安定的に給湯バーナ７へ供給する。
【００２４】
【表１】

【００２５】
燃焼制御部24は、図７に示した給湯器と同様に、シーケンスプログラムを用いて給湯器の給湯燃焼運転制御を行うものであり、この動作は従来例とほぼ同様であるので、その重複説明は省略する。なお、燃焼制御部24は、給湯バーナ７の給湯燃焼停止時に給湯燃焼運転停止信号を待機時間計測部29に加える。
【００２６】
待機時間計測部29は、燃焼制御部24からの給湯燃焼運転停止信号を受けて給湯バーナ７の給湯燃焼停止を判断し、一方、流量センサ９からの入水信号を取り込み、前記給湯燃焼運転停止信号が加えられた以降に流量センサ９によって入水が検出されたときに再出湯開始を判断する。そして、給湯燃焼停止時から再出湯開始までの待機時間を計測し、計測した待機時間の値を弁絞り量制御手段28に加える。
【００２７】
延長筒長さ検出部31は、延長筒51の長さ、すなわち、吸気延長管路52と排気延長管路53の並設長さを検出するものである。延長筒長さ検出部31は、本実施形態例では、ファン回転モード切替手段34のファン回転制御モード情報を取り込み、このモード情報から延長筒51の長さを検出するようになっている。具体的には、表１に示したように、延長筒51の長さＬに応じてＡ，Ｂ，Ｃの３段階に定められたファン回転制御モードのうちの１つの制御モードが、ファン回転モード切替手段34によって設定されているために、例えばＡモードが設定されている場合には、延長筒51の長さＬは、Ｌ₁≦Ｌ＜Ｌ₂であると判断することができる。また、同様に、ファン回転制御モードがＢモード、Ｃモードのときには、延長筒51の長さＬは、それぞれ、Ｌ₂≦Ｌ＜Ｌ₃，Ｌ₃≦Ｌ≦Ｌ₄であると判断される。延長筒長さ検出部31は、このようにして求めた延長筒51の長さを弁絞り制御手段28に加える。
【００２８】
なお、吸気延長管路52と排気延長管路53の並設長さに応じて、給湯熱交換器２の再出湯時の後沸き特性には違いが生じる。それというのは、図５に示すように、吸気延長管路52と排気延長管路53が並設されている場合に、吸気延長管路52を通る吸気空気は、排気延長管路53の排気熱風（例えば100 ℃〜120 ℃の風）の熱を受け取って加熱され（例えば、70℃以上に加熱され）、この加熱された空気が、給湯バーナ７の燃焼停止後のポストパージ期間（燃焼停止後、燃焼室22内の排気を外部へ排出するために燃焼ファン５を駆動させる期間）には給湯バーナ７を介して給湯熱交換器２に吹き付けられることになる。
【００２９】
その吸気温風の温度は延長筒51の長さ（つまり、吸気延長管路52と排気延長管路53が並設している長さ）Ｌが長くなるに従って高温になり、上記吸気温風の温度が高くなるに従って給湯熱交換器２の滞留湯が冷めにくくなって、給湯熱交換器２の滞留湯の後沸き時間が吸気温風が高温になるに従って長くなり、かつ、後沸きの大きさも大きくなる。
【００３０】
データ格納部30には、延長筒51の長さに応じて定められた水量制御弁絞り量制御データが格納されている。この格納データは、本実施形態例では、図２の（ａ）に示すように、待機時間をパラメータとした水量制御弁絞り量の関数データであり、グラフデータにより与えられている。
【００３１】
同図に示す水量制御弁絞り量制御データは、延長筒51の長さＬに応じて３段階の制御モード（Ｐモード、Ｑモード、Ｒモード）のデータとして与えられており、延長筒51の長さＬが長くなるにつれて、すなわち、Ｐモード→Ｑモード→Ｒモードとなるにつれて、再出湯に備えた待機中の水量制御弁16の絞り量は小さくなり、延長筒51の長さＬが短くなるにつれて、すなわち、Ｒモード→Ｑモード→Ｐモードとなるにつれて、水量制御弁16の絞り量は大きくなっている。また、各モードにおいて、水量制御弁16の絞り量は待機時間に応じて変化するようになっており、例えば、Ｒモードにおいては、待機時間が長くなるにつれて水量制御弁16の絞り量は小さくされている。
【００３２】
なお、このような水量制御弁絞り量制御データは、予め実験等により求められる、図２の（ｂ）に示すような待機時間と再出湯時の目標流量（再出湯湯温安定化が可能とされる入水流量）との相関データおよび、同図の（ｃ）に示すような、目標流量と水量制御弁絞り量との相関データとにより導くことができる。
【００３３】
弁絞り量制御手段28は、データ格納部30に格納された水量制御弁絞り量制御データに基づいて、吸気延長管路52と排気延長管路53の並設長さが長くなるにつれて再出湯に備えた待機中の水量制御弁16の絞り量を小さくし、並設長さが短くなるにつれて待機中の水量制御弁16の絞り量を大きくするものである。この制御に際し、弁絞り量制御手段28は、データ格納部30に格納した、図２の（ａ）に示すデータに基づき、前記延長筒長さ検出部31で求めた延長筒51の長さＬに応じて、水量制御弁絞り量制御モードＰモード、Ｑモード、Ｒモードのうちの１つの動作モードを選択し、さらに、待機時間計測部29で求められる待機時間に応じて水量制御弁16の絞り量を決定する。そして、この決定した絞り量で水量制御弁16を絞り、再出湯に備える。
【００３４】
本実施形態例は以上のように構成されており、本実施形態例でも、従来例と同様に、燃焼制御部24による燃焼制御動作が行われて給湯バーナ７のバーナ燃焼が行われるが、このバーナ燃焼に際し、本実施形態例では、ファン回転モード切替手段34によって設定されたファン回転制御モードに基づいて燃焼ファン５の回転制御が行われる。また、延長筒長さ検出部31により、ファン回転モード切替手段34によって設定されたファン回転制御モードに基づいて延長筒51の長さＬが求められ、この延長筒51の長さＬの値が弁絞り量制御手段28に加えられる。そして、給湯燃焼が停止されると、この給湯燃焼停止時から再出湯開始までの待機時間が待機時間計測部29によって計測され、この待機時間が弁絞り量制御手段に加えられる。
【００３５】
そうすると、弁絞り量制御手段28は、延長筒長さ検出部31によって求められた延長筒51の長さＬに応じて選択した水量制御弁絞り量制御モードと、待機時間計測部29で求めた待機時間に応じて、再出湯に備えた待機中の水量制御弁16の絞り量を制御する。例えば、延長筒51の長さＬがＬ₁以上Ｌ₂未満（Ｌ₁≦Ｌ＜Ｌ₂）のときには、図２の（ａ）に示すＰモードの水量制御弁絞り量制御モードが選択され、かつ、待機時間が同図のＴ_Mであったとすると、水量制御弁16の絞り量が同図のＡ₁に大きく制御される。
【００３６】
また、延長筒51の長さＬがＬ₂以上Ｌ₃未満（Ｌ₂≦Ｌ≦Ｌ₃）のときには、図２の（ａ）のＱモードの水量制御弁絞り量制御データが選択されるために、待機時間が前記と同様にＴ_Mであったとしても、このときの水量制御弁16の絞り量は前記Ａ₁よりも小さいＡ₂に設定され、さらに、延長筒51の長さＬがＬ₃以上Ｌ₄以下（Ｌ₃≦Ｌ≦Ｌ₄）のときには、Ｒモードの水量制御弁絞り量制御モードが選択されるために、待機時間が前記と同様のＴ_Mであっても、水量制御弁16の絞り量はさらに小さいＡ₃に設定され、制御される。
【００３７】
そして、以上のような水量制御弁16の絞り量設定を行うことにより、延長筒51の長さＬがＬ₁以上Ｌ₂未満の小さい長さであり、したがって、待機時間がＴ_M経過したときの後沸きの大きさも小さいときには再出湯に備えた待機中の水量制御弁16の絞り量を図２の（ａ）のＡ₁の値に大きくして待機することにより、図３の（ａ）の特性線ｂに示すように、再出湯直後の給湯熱交換器２への入水量を小さくして出湯量を小さくする。そうすると、例えば同図の特性線ｂ′に示すように、水量制御弁16の絞り量を大きくせずに給湯熱交換器２への入水量を大きくしたときの、給湯熱交換器２の通水による残留湯温特性（特性線ａ′）のように湯温の降下が大きくなることはなく、同図の特性線ａに示されるように残留湯温の降下の割合が抑制される。そのため、この残留湯温の降下分と、同図の特性線ｃに示す入水温度の上昇分とが一致し、同図の特性線ｓに示すように、給湯設定温度にほぼ近い湯温の出湯が行われる。
【００３８】
一方、例えば延長筒51の長さＬがＬ₃以上Ｌ₄以下で長いときには、待機時間Ｔ_M経過後の給湯熱交換器２の後沸きが、例えば図３の（ｂ）に示すように大きく、かつ、長くなるために、弁絞り量制御手段28による水量制御弁16の絞り量を小さくし、給湯熱交換器２への入水量を多くすることで、給湯熱交換器２への入水による湯温の降下の割合が大きくなっても、通水による給湯熱交換器２の残留湯温特性は同図の特性線ａに示すようになり、この湯温の降下分と入水温度の上昇分とがほぼ一致する。そのため、給湯設定温度とほぼ等しい湯温の出湯が、出湯量の多い状態で行われる。
【００３９】
本実施形態例によれば、上記動作により、延長筒51の長さＬに応じ、この長さＬが長くなるにつれて再出湯に備えた待機中の水量制御弁16の絞り量を小さくし、長さＬが短くなるにつれて待機中の水量制御弁16の絞り量を大きく制御することにより、延長筒51の長さＬが長くなるにつれて大きくなる給湯熱交換器２の後沸き量に対応させて的確に入水量の制御を行うことが可能となり、それにより、給湯設定温度とほぼ等しい湯温の出湯を行うことができるし、水量制御弁16の絞り量を大きくする必要がないにも拘わらず、水量制御弁16の絞り量を過剰に大きくすることはないために、水量制御弁16の絞り量の過剰制御によって出湯量が小さくなることによる使い勝手の悪さを解消することができる。
【００４０】
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、上記実施形態例では、水量制御弁絞り量制御データとして、図２の（ａ）に示したように、吸気延長管路52と排気延長管路53の並設長さＬに応じて待機時間をパラメータとした３段階の水量制御弁絞り量制御モードを与えたが、水量制御弁絞り量制御データは必ずしも３つ（３段階）の水量制御弁絞り量制御モードによって与えられるとは限らない。例えば、前記並設長さＬに応じた２つ又は４つ以上の水量制御弁絞り量制御モードを与えてもよいし、並設長さＬに応じて連続的に水量制御弁絞り量を可変するように定めた水量制御弁絞り量制御データとしてもよい。また、水量制御弁絞り量制御データは必ずしもグラフデータにより与えるとは限らず、テーブルデータや演算式等によって与えても構わない。
【００４１】
さらに、弁絞り量制御手段28は、図１の破線に示すように、入水温度センサ10によって検出される給湯熱交換器２への入水温を取り込んで、入水温が高くなるにつれて再出湯に備えた待機中の水量制御弁16の絞り量を小さくし、入水温が低くなるにつれて水量制御弁16の絞り量を大きくする構成としてもよい。
【００４２】
それというのは、給湯熱交換器２への入水温が低いときには、給湯熱交換器２への入水による湯温の降下の割合が大きいために、待機時間や吸気延長管路52と排気延長管路53の並設長さＬが同じであっても、給湯熱交換器２に水が通水されることによる給湯熱交換器２内の残留湯温の冷却が大きい。そのため、例えば図９に示すように、水量制御弁16の絞り量を小さくしたときに、給湯熱交換器２内の残留湯温が一気に冷却され、残留湯温の降下分に入水温の上昇分が間に合わず、この遅れΔｔにより、同図の特性線ｓに示すように、アンダーシュートの湯が出湯されることがある。一方、給湯熱交換器２への入水温が高い場合には、給湯熱交換器２への入水による湯温低下の割合が小さいために、前記と同様の場合にも給湯熱交換器２への入水による残留湯温の降下分が少なく、特に水量制御弁16の絞り量を大きくする必要がない場合もある。
【００４３】
したがって、吸気延長管路52と排気延長管路53の並設長さおよび待機時間の他に、この給湯熱交換器２への入水温を考慮して水量制御弁16の絞り量を制御すると、より一層確実に再出湯湯温安定化を図ることが可能となり、かつ、使い勝手のよい燃焼機器とすることができる。なお、このように、給湯熱交換器２への入水温も考慮して水量制御弁16の絞り量を制御するときには、例えば、データ格納部30に、吸気延長管路52と排気延長管路53の長さＬと待機時間と給湯熱交換器２の入水温とをパラメータとした制御データを与えることにより、弁絞り量制御手段28による水量制御弁16の絞り量を制御することができる。
【００４４】
さらに、上記実施形態例では、待機時間計測部29は、流量センサ９の流量検出信号に基づいて再出湯開始を判断したが、待機時間計測部29は、燃焼制御部24の制御動作の情報に基づいて再出湯開始を検知してもよいし、給湯管４の給湯栓１側に流水を検出するための流水スイッチ（給湯確認スイッチ）等のセンサを設け、このセンサのセンサ出力を用いて再出湯開始を検知するようにしてもよい。
【００４５】
さらに、上記実施形態例では、延長筒長さ検出部31は、ファン回転モード切替手段34に設定されている延長筒51の長さ（吸気延長管路52と排気延長管路53の並設長さ）Ｌに対応したファン回転制御モードに基づいて延長筒Ｌの長さを検出したが、例えば、燃焼ファン５のファン風量を検出する風量センサを設け、この風量センサの検出ファン風量に基づいて延長筒51の長さＬを検出するようにしてもよい。それというのは、例えば、予め定めた一定のファン回転数で燃焼ファン５を回転駆動させた場合に、延長筒51の長さＬが長くなるに従って延長筒51の管路抵抗の増大により風量センサの検出ファン風量は小さくなることから、風量センサの検出ファン風量に基づいて延長筒51の長さを検出することができる。
【００４６】
さらに、燃焼機器に延長筒長さ入力手段を設け、燃焼機器の施工時等に施工業者等によって延長筒51の長さを入力するようにし、この入力信号に基づいて弁絞り量制御手段28が延長筒51の長さを判断し、その判断結果によって水量制御弁16の絞り量を制御するようにしてもよい。
【００４７】
さらに、上記実施形態例では、延長筒51は、吸気延長管路52と排気延長管路53の二重管構造であったが、図６の（ａ）に示すように、吸気延長管路52と排気延長管路53が隣接した二本管構造であってもよい。この場合は、屋外に出る部分のみが２重管（吸気と排気が接触する部分）となるので、アンダーシュート、オーバーシュート改善のための延長筒長さの設定はＬ′によって決まる。また、図６の（ｂ）に示すように、吸気延長管路52を省略し、その代わりに器具ケース26にルーバ49を介して外部の空気を取り込むようにしたものでもよいし、屋外に配置する目的で製造される燃焼機器であれば、吸気延長管路および排気延長管路53を省略し、その代わりに器具ケース26に上記同様のルーバ49と、図６の（ｂ）の破線で示すように排気管路55に連通する排気孔48とを設け、ルーバ49を介して外部の空気を取り込み、排気口48を介して排気ガスを外部へ排出するタイプのものであってもよい。
【００４８】
上記のように、排気延長管路53のみを有する、あるいは、吸気延長管路52と排気延長管路53の両方がないタイプの給湯器において、上記実施形態例に示された屋内式の制御装置20と同一のものを用いて制御する場合には、排気ガスの熱によって吸気空気の温度が高温に加熱されることはないので、制御特性改善のために設定する延長筒長さ設定（延長筒長さ判断）を最短として制御する。
【００４９】
さらに、上記実施形態例では、給湯バーナ７は、Ａ，Ｂ，Ｃ面の燃焼面を備えた燃焼面切り換え方式の多段能力式の給湯バーナ７とし、燃焼機器はこの給湯バーナ７を有する給湯器としたが、本発明の燃焼機器は必ずしも多段能力式の給湯バーナを備えているとは限らず、１段の燃焼面を有する給湯バーナを備えた給湯器としてもよい。
【００５０】
さらに、上記実施形態例では、燃焼機器として、給湯バーナ７を備えた単機能の給湯器について説明したが、本発明の燃焼機器は必ずしも単機能の給湯器とするとは限らず、例えば給湯機能と追い焚き機能とを備えた複合給湯器としてもよく、給湯バーナと燃焼ファンとを備えた様々な燃焼機器に適用されるものである。
【００５１】
【発明の効果】
本発明によれば、再出湯時の給湯熱交換器の後沸き特性が、燃焼機器に設けられた吸気延長管路とこの吸気延長管路の近傍に並設された排気延長管路の並設長さに応じて異なり、この並設長さが長いほど後沸きが大きく並設長さが短いほど後沸きが小さいことに着目し、例えば、この並設長さが長くなるにつれて再出湯に備えた待機中の水量制御弁の絞り量を小さくし並設長さが短くなるにつれて待機中の水量制御弁の絞り量を大きく制御するようにしたものであるから、後沸きが小さいときには水量制御弁の絞り量を大きくして待機し、再出湯時の出湯量を小さくし、再出湯直後に多量の水が給湯熱交換器に入水しないようにすることで、給湯熱交換器内の残留湯温の急激な低下を抑制し、それにより、アンダーシュートの湯の出湯を抑制して再出湯湯温安定化を図ることができる。
【００５２】
また、本発明によれば、前記の如く、例えば、吸気延長管路と排気延長管路の並設長さが長くなるにつれて、再出湯に備えた待機中の水量制御弁の絞り量を小さくするが、前記並設長さが長いときには給湯熱交換器の後沸きが大きいために、水量制御弁の絞り量が小さいことにより再出湯直後に多めの水が給湯熱交換器に入水して給湯熱交換器内の湯が急激に冷やされても、再出湯時にアンダーシュートが起こる心配はないと共に、水量制御弁の絞り量を小さくした分だけ多めの湯を再出湯直後から使用することが可能となり、使い勝手をよくすることができる。
【００５３】
また、前記水量制御弁絞り量制御データは給湯バーナの給湯燃焼停止から再出湯開始までの待機時間をパラメータとした水量制御弁絞り量の関数データによって与えられている本発明によれば、待機時間に応じて異なる再出湯時の給湯熱交換器の後沸き特性に対応して水量制御弁の絞り量を制御することが可能となり、水量制御弁絞り量の制御による再出湯湯温安定化等の効果を非常に効果的に発揮することができる。
【００５４】
さらに、前記弁絞り量制御手段は、給湯熱交換器への入水温を取り込んで該入水温が高くなるにつれて前記再出湯に備えた待機中の水量制御弁の絞り量を小さくし入水温が低くなるにつれて前記水量制御弁の絞り量を大きくする構成とした本発明によれば、入水温が低いときには水量制御弁の絞り量を大きくして再出湯時の出湯量を小さくし、再出湯直後に多量の水が給湯熱交換器に入水しないようにすることで、給湯熱交換器内の残留湯温の急激な低下を抑制することができるために、より一層再出湯湯温安定化を効果的に図ることができると共に、給湯熱交換器への入水温が高く、再出湯直後に多めの水が給湯熱交換器に入水しても給湯熱交換器内の湯が急激に冷やされることはないときには、水量制御弁の絞り量を小さくし、その分だけ使い勝手をより一層よくすることができる。
【００５５】
さらに、前記燃焼ファンが燃焼室の排気側に設けられ、この燃焼ファンの駆動により給湯バーナ燃焼の排気を吸い出す構成とした本発明によれば、燃焼ファンの駆動により給湯バーナ燃焼の排気ガスを吸い出すので排気ガスをより効率的に外部へ排出することができる。
【図面の簡単な説明】
【図１】本発明に係る燃焼機器の一実施形態例の制御部要部構成を示すブロック図である。
【図２】上記実施形態例の燃焼機器に与えられている水量制御弁絞り量制御データの例を示すグラフである。
【図３】上記実施形態例の燃焼機器による水量制御弁絞り量制御動作とこの制御動作に伴う出湯湯温変化の一例を示す説明図である。
【図４】上記実施形態例の燃焼機器に与えられているファン回転制御モード毎のファン回転数と燃焼能力の関係例を示すグラフである。
【図５】上記実施形態例の燃焼機器である給湯器を示すシステム構成図である。
【図６】燃焼機器の吸排気手段の他のシステム構成例を示す説明図である。
【図７】一般的な給湯器を示すシステム構成図である。
【図８】再出湯時の水量制御弁の絞り量制御による給湯熱交換器内湯温の降下制御動作の一例を示す説明図である。
【図９】給湯熱交換器への入水温が低いときに、水量制御弁を全開として再出湯を行ったときの再出湯湯温変化を示すグラフである。
【符号の説明】
２給湯熱交換器
７給湯バーナ
10 入水温度センサ
16 水量制御弁
28 弁絞り量制御手段
29 待機時間計測部
30 データ格納部
31 延長筒長さ検出部
51 延長筒
52 吸気延長管路
53 排気延長管路[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a combustion apparatus provided with a water amount control valve for adjusting the amount of water passing through a hot water supply heat exchanger.
[0002]
[Prior art]
FIG. 7 shows a system configuration of a general water heater as a combustion device. In the figure, a water supply pipe 3 of a water supply passage is connected to the inlet side of a hot water supply heat exchanger 2 provided in the combustion chamber 22, and the water supply temperature of a thermistor or the like for detecting the water temperature is connected to the water supply pipe 3. A sensor 10 and a flow rate sensor 9 for detecting the amount of incoming water (the amount of water passing through the hot water supply heat exchanger) are provided. A hot water supply pipe 4 of the hot water supply passage is connected to the outlet side of the hot water supply heat exchanger 2, and a hot water tap 1 is provided on the outlet side of the hot water supply pipe 4. Further, the hot water supply pipe 4 is provided with a water amount control valve 16 and a hot water temperature sensor 11 such as a thermistor for detecting the hot water temperature.
[0003]
Below the hot water supply heat exchanger 2, a hot water supply burner 7 that performs heating combustion of the hot water supply heat exchanger 2, an igniter electrode 18 that performs point ignition of the hot water supply burner 7, a frame rod electrode 19 that detects ignition, and a hot water supply burner 7 A combustion fan 5 that supplies and exhausts combustion air (supply and exhaust for hot water supply burner combustion) is provided, and a fan rotation sensor 21 that detects the rotational speed of the combustion fan 5 is provided. A nozzle holder 6 is disposed at the gas inlet of the hot water supply burner 7 with the gas nozzle facing the gas inlet, and a proportional control valve 13 for controlling the amount of gas supplied to the gas pipe 8 leading to the nozzle holder 6 by the valve opening amount. And an original solenoid valve 12 for opening and closing the gas pipeline. The

solenoid valves

20a, 20b, and 20c are for switching the combustion surfaces of A, B, and C of the hot water burner 7.
[0004]
This type of water heater is provided with a control device 14, and a remote control 15 is connected to the control device 14. The remote control 15 has an operation button, a button for setting hot water temperature, and a hot water supply setting not shown. A temperature setting temperature display section is provided. The control device 14 is provided with a combustion control unit, and controls the hot water supply operation of the water heater using a sequence program. When the hot-water tap 1 is opened, the flow rate sensor 9 detects the amount of incoming water, and when the incoming water amount exceeds a certain level (above the minimum operating flow rate), the combustion fan 5 is turned on. When the rotation of the combustion fan 5 enters a predetermined rotation region, the original solenoid valve 12, the solenoid valve 20a (or 20a, 20b or 20a, 20b, 20c) and the proportional control valve 13 are opened and the hot water supply burner 7 is opened. Gas is supplied and the ignition of the igniter electrode 18 is performed.
[0005]
Next, the flame rod electrode 19 confirms the ignition of the hot water supply burner 7 and feedforward control (a control system in which combustion is performed according to a preset gas amount supply pattern without detecting the hot water temperature by the hot water temperature sensor 10). ) Feedback control by PID calculation, etc. (a method in which the tapping temperature is detected by the tapping temperature sensor 10 and the gas supply amount, that is, the valve opening amount of the proportional control valve 13 is controlled by the PID calculation so that the tapping temperature approaches the set temperature. ) Move to).
[0006]
When the use of the hot water is finished and the hot water tap 1 is closed, the flow stop is detected by the flow sensor 9, and the control device 14 shuts off the original solenoid valve 12 in response to the detection signal of the stop of water flow. The combustion of the hot water supply burner 7 is stopped.
[0007]
In this type of water heater, after the hot water combustion is stopped, the heat held in the main body of the hot water heat exchanger 2 is gradually propagated to the hot water remaining in the hot water heat exchanger 2 and remains. Although the so-called post-boiling phenomenon occurs, in which the hot water temperature is slightly higher than the set temperature of the hot water supply, it is naturally cooled after that, so that if the waiting time from the hot water combustion stop to the start of re-watering becomes longer, the hot water supply heat exchanger 2 The remaining hot water temperature gradually decreases. Therefore, in this state, hot water is discharged again. When the hot water tap 1 is fully open and a large amount of cold water enters the hot water supply heat exchanger 2, as shown in FIG. The hot water in the exchanger will drop rapidly, and since the heating power of the hot water supply burner 7 cannot catch up to heat this large amount of water to the set temperature, it will produce a warm undershoot hot water that is considerably lower than the set temperature. The phenomenon will happen.
[0008]
Therefore, recently, for example, when the waiting time reaches a predetermined set time (water amount control valve throttling amount switching time), the water amount control valve 16 is made to wait for the next tapping in a state where the water amount control valve 16 is throtated to a certain amount. A method is considered. In such a water heater, since the water amount control valve 16 is in a throttled state, a small amount of water enters the hot water supply heat exchanger 2, and therefore, as shown in FIG. The time T until the hot water temperature in the hot water supply heat exchanger 2 becomes lower than the set temperature is gradually lowered due to the water entering the water. _A In addition, the small amount of water is sufficiently heated to the set temperature by feedback control between the time when the hot water tap 1 is opened and the time when the hot water heat exchanger 2 is exited. You can use hot water comfortably without feeling pleasant.
[0009]
[Problems to be solved by the invention]
By the way, in the combustion equipment such as the hot water heater as described above, after boiling of the hot water supply combustion, after boiling occurs due to the heat held in the main body of the hot water supply heat exchanger 2 and the like. It varies depending on the combustion equipment. For example, FIG. 5 shows a water heater provided with an extension cylinder 51 formed into a double pipe structure by an intake extension pipe 52 and an exhaust extension pipe 53 led out from the appliance body of the water heater. However, it is known that in such a water heater, the size of the post-boiling differs depending on the length of the extension cylinder 51 (the length of the intake extension pipe 52 and the exhaust extension pipe 53 arranged in parallel). .
[0010]
Therefore, in the combustion equipment provided with such an extension cylinder 51, as described above, when the standby time reaches a predetermined set time, the water control valve 16 is prepared for the next tapping with the water amount control valve 16 being squeezed to a certain amount. However, depending on the length of the extension cylinder 51, the throttle amount of the water amount control valve 16 may be increased despite the necessity of increasing the throttle amount of the water amount control valve 16 and waiting. There was a problem that it was supposed to be used in a state where it was not very convenient to use, or that the amount of water control valve 16 was not enough to squeeze out, resulting in the occurrence of undershoot hot water.
[0011]
The present invention has been made in order to solve the above-mentioned problems, and the object thereof is also when the length of the parallel arrangement of the intake extension pipe and the exhaust extension pipe led out from the instrument body of the combustion equipment is long. It is an object of the present invention to provide a combustion device that can stabilize the hot water temperature at the time of re-watering after the hot water supply combustion stop even if it is short, and is as easy to use as possible.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides means for solving the problems by the following configuration. That is, the first invention comprises a hot water supply burner that performs heating and combustion of a hot water supply heat exchanger, a combustion fan that supplies and discharges hot water burner combustion, and a water amount control valve that adjusts the amount of water passing through the hot water supply heat exchanger. It is determined according to the length of the parallel arrangement of the intake extension pipe and the exhaust extension pipe in the combustion equipment of the type that waits for the throttle amount of the water amount control valve as the predetermined throttle amount when hot water combustion stops In addition, valve throttle amount control means for controlling the throttle amount of the standby water amount control valve based on the water amount control valve throttle amount control data is provided.
[0013]
The second aspect of the invention includes a hot water supply burner that performs heating and combustion of a hot water supply heat exchanger, a combustion fan that performs supply and exhaust of hot water supply burner combustion, and a water amount control valve that adjusts the amount of water passing through the hot water supply heat exchanger. In a combustion device of a type that performs standby discharge by waiting for the throttle amount of the water amount control valve as a predetermined throttle amount when hot water combustion is stopped, it is led out from the main body of the appliance of the combustion device and driven externally by driving the combustion fan. An intake extension pipe that takes air into the appliance, and an exhaust extension pipe that is juxtaposed in the vicinity of the intake extension pipe and that exhausts the hot water burner to the outside by driving a combustion fan. On the basis of the water amount control valve throttle amount control data determined according to the parallel arrangement length of the passage and the exhaust extension pipeline, the re-extruding hot water is increased as the parallel extension length of the intake extension pipeline and the exhaust extension pipeline increases. Throttling of the standby water volume control valve It is configured as characterized in the amount of small and valve aperture amount control means for increasing the aperture amount of water control valve in the standby as parallel 設長 is shorter is provided.
[0014]
Further, the water amount control valve throttle amount control data is given by the function data of the water amount control valve throttle amount with the waiting time from the hot water combustion stop of the hot water burner to the start of re-draining as a parameter, the valve throttle amount control means The intake water temperature to the hot water supply heat exchanger is taken in, and as the incoming water temperature increases, the throttle amount of the standby water amount control valve prepared for the re-draining water decreases, and as the incoming water temperature decreases, the throttle of the water amount control valve decreases The configuration in which the amount is increased is also a characteristic configuration of the first and second inventions.
[0015]
Further, the combustion fan is provided on the exhaust side of the combustion chamber, and the exhaust of the hot water burner combustion is sucked by driving the combustion fan, which is a characteristic configuration of the first and second inventions. .
[0016]
In the combustion apparatus in which the intake extension pipe and the exhaust extension pipe are provided side by side as in the present invention having the above-described configuration, the intake air passing through the intake extension pipe is the exhaust hot air in the exhaust extension pipe. The hot water burner is heated by receiving heat and, for example, the post-purge (the operation of driving the combustion fan to discharge the exhaust in the combustion chamber to the outside after the combustion is stopped) is performed after the heated air is stopped from the hot water burner. When the hot water supply heat exchanger is sprayed, the after boiling of the hot water supply heat exchanger increases.
[0017]
The amount of post-boiling (size and length of post-boiling, etc.) varies depending on the length of the parallel arrangement of the intake extension pipe and the exhaust extension pipe. Since the temperature of the wind blown to the vessel becomes higher, the amount of after-boiling becomes larger as the juxtaposed length is longer.
[0018]
In the present invention having the above-described configuration, the water amount control valve throttle amount control data is determined according to the parallel arrangement length of the intake extension pipe and the exhaust extension pipe. Based on this data, for example, the intake extension pipe As the parallel arrangement length of the passage and the exhaust extension pipe increases, the throttle amount of the standby water amount control valve prepared for re-draining is reduced, and as the parallel length decreases, the standby amount of the standby water amount control valve In order to perform the control to increase the valve by the valve throttle amount control means, it becomes possible to perform the throttle amount control of the water amount control valve according to the size of the post-boiling of the hot water supply heat exchanger, and the parallel arrangement length is long In addition, even when the temperature is short, the temperature of the re-watering hot water is stabilized, and the inconvenience caused by excessively squeezing the water amount control valve and waiting is eliminated, and the above-described problem is solved.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the present embodiment, the same reference numerals are assigned to the same name portions as in the conventional example, and the duplicate description thereof is omitted. The combustion apparatus of this embodiment is a water heater provided with the extension cylinder 51 shown in FIG. 5, and in this water heater, the combustion fan 5 is provided on the exhaust side of the combustion chamber 22. The intake extension pipe 52 takes in external air into the appliance by driving the combustion fan 5, and the exhaust extension pipe discharges hot water burner combustion exhaust to the outside by driving the combustion fan 5. The exhaust extension line 53 is disposed inside the intake extension line 52. The intake extension pipe 52 is attached to the instrument case 26, and the exhaust extension pipe 53 is communicated with the combustion chamber 22 via an exhaust pipe 55 on the exhaust side of the combustion chamber 22.
[0020]
Also in this water heater, a hot water burner 7 is provided in the combustion chamber 22, an intake hole 23 is formed in a combustion chamber forming wall below the hot water burner 7, and the combustion fan 17 is driven to rotate. Thus, external air is supplied to the hot water supply burner 7 through the intake extension pipe 52, the instrument case 15, the space 54 in the combustion chamber side wall, and the air hole 23, and the exhaust gas generated by the combustion of the hot water supply burner 7 is supplied. It is formed so as to be discharged to the outside through the exhaust pipe 55 and the exhaust extension pipe 53.
[0021]
As shown in FIG. 1, the water heater control device 14 is provided with a water amount control valve control circuit unique to this embodiment, and is connected to a fan rotation mode switching means 34. In addition, since the structure of this embodiment other than the above is the same as that of the water heater shown in FIG. 7, the description thereof will be omitted, and the above-described water amount control valve control circuit will be described below.
[0022]
As shown in FIG. 1, this water amount control valve control circuit includes a combustion control unit 24, a standby time measurement unit 29, a valve throttle amount control means 28, a data storage unit 30, and an extended cylinder length detection unit 31. It is connected to the fan rotation mode switching means 34.
[0023]
The fan rotation mode switching means 34, for example, as shown in Table 1, sets a fan rotation control mode that is predetermined in a stepwise manner according to the length L of the extension cylinder 51 at the time of construction of a water heater. A serviceman or the like performs switching setting based on the length L of the extension cylinder 51, and the control device 14 has the fan rotation speed and the combustion capacity as shown in FIG. 4 given for each predetermined fan rotation control mode. Fan rotation control data indicating the relationship is obtained and obtained through experiments and calculations. The control device 14 controls the rotation of the combustion fan 5 based on the fan rotation control data in the fan rotation control mode set in the fan rotation mode switching means 34, and the extension cylinder 51 changes according to the length L of the extension cylinder 51. The air volume corresponding to the combustion capacity of the hot water supply burner 7 is stably supplied to the hot water supply burner 7 without being affected by the pipe resistance.
[0024]
[Table 1]

[0025]
The combustion control unit 24 controls the hot water supply and combustion operation of the hot water heater using a sequence program in the same manner as the hot water heater shown in FIG. 7, and this operation is almost the same as that of the conventional example. Is omitted. The combustion control unit 24 adds a hot water combustion operation stop signal to the standby time measurement unit 29 when the hot water supply burner 7 stops hot water combustion.
[0026]
The standby time measuring unit 29 receives the hot water combustion operation stop signal from the combustion control unit 24 and determines whether or not to stop hot water combustion of the hot water burner 7, and takes in the incoming water signal from the flow rate sensor 9 to obtain the hot water combustion operation stop signal. When the water flow is detected by the flow sensor 9 after the addition of, the start of re-watering is determined. Then, the standby time from the hot water combustion stop to the start of re-heating is measured and the value of the measured standby time is added to the valve throttle control means 28.
[0027]
The extension cylinder length detection unit 31 detects the length of the extension cylinder 51, that is, the juxtaposed length of the intake extension duct 52 and the exhaust extension duct 53. In this embodiment, the extension cylinder length detection unit 31 takes in the fan rotation control mode information of the fan rotation mode switching means 34, and detects the length of the extension cylinder 51 from this mode information. Specifically, as shown in Table 1, one of the fan rotation control modes determined in three stages A, B, and C according to the length L of the extension cylinder 51 is fan rotation. For example, when the A mode is set because the mode switching means 34 is set, the length L of the extension cylinder 51 is set to L ₁ ≦ L <L ₂ Can be determined. Similarly, when the fan rotation control mode is the B mode or the C mode, the length L of the extension cylinder 51 is set to L, respectively. ₂ ≦ L <L _Three , L _Three ≦ L ≦ L _Four It is judged that. The extension cylinder length detector 31 adds the length of the extension cylinder 51 thus determined to the valve throttle control means 28.
[0028]
Note that there is a difference in the post-boiling characteristics when the hot water supply heat exchanger 2 is re-drained depending on the lengths of the intake extension pipe 52 and the exhaust extension pipe 53 arranged side by side. This is because, as shown in FIG. 5, when the intake extension pipeline 52 and the exhaust extension pipeline 53 are arranged in parallel, the intake air passing through the intake extension pipeline 52 is exhausted from the exhaust extension pipeline 53. The heat of hot air (for example, 100 ° C. to 120 ° C.) is received and heated (for example, heated to 70 ° C. or more), and this heated air is used for the post-purge period (combustion stop) after the hot water supply burner 7 stops combustion. Thereafter, during the period when the combustion fan 5 is driven to discharge the exhaust gas in the combustion chamber 22 to the outside, the hot water supply heat exchanger 2 is blown through the hot water supply burner 7.
[0029]
The temperature of the intake hot air becomes higher as the length of the extension cylinder 51 (that is, the length in which the intake extension pipe 52 and the exhaust extension pipe 53 are arranged in parallel) L becomes longer. As the temperature rises, the hot water in the hot water supply heat exchanger 2 becomes harder to cool, and the post boiling time of the hot water in the hot water supply heat exchanger 2 becomes longer as the intake hot air becomes hot. growing.
[0030]
The data storage unit 30 stores water amount control valve throttle amount control data determined according to the length of the extension cylinder 51. In this embodiment, as shown in FIG. 2A, this stored data is function data of the water amount control valve throttle amount with the standby time as a parameter, and is given by graph data.
[0031]
The water amount control valve throttle amount control data shown in the figure is given as data in three stages of control modes (P mode, Q mode, and R mode) according to the length L of the extension cylinder 51. As the length L increases, that is, from the P mode to the Q mode to the R mode, the throttle amount of the standby water amount control valve 16 prepared for re-watering decreases, and the length L of the extension cylinder 51 decreases. As a result, that is, as the R mode → the Q mode → the P mode, the throttle amount of the water amount control valve 16 increases. In each mode, the throttle amount of the water amount control valve 16 changes according to the standby time. For example, in the R mode, the throttle amount of the water amount control valve 16 is reduced as the standby time becomes longer. ing.
[0032]
It should be noted that such water amount control valve throttle amount control data is obtained in advance by experiments or the like, as shown in (b) of FIG. ) And correlation data between the target flow rate and the water amount control valve throttling amount as shown in (c) of FIG.
[0033]
Based on the water amount control valve throttle amount control data stored in the data storage unit 30, the valve throttle amount control means 28 is used to re-drain the hot water as the parallel length of the intake extension conduit 52 and the exhaust extension conduit 53 becomes longer. The throttle amount of the standby water amount control valve 16 provided is reduced, and the throttle amount of the standby water amount control valve 16 is increased as the parallel arrangement length becomes shorter. In this control, the valve throttle amount control means 28 determines the length L of the extension cylinder 51 obtained by the extension cylinder length detection section 31 based on the data shown in FIG. In response to this, one operation mode is selected from the water amount control valve throttling amount control mode P mode, Q mode, and R mode, and the water amount control valve 16 of the water amount control valve 16 is selected according to the waiting time required by the waiting time measuring unit 29. Determine the amount of aperture. Then, the water amount control valve 16 is squeezed with the determined amount of squeezing to prepare for re-draining.
[0034]
The present embodiment is configured as described above. In this embodiment as well, the combustion control operation by the combustion control unit 24 is performed and the burner combustion of the hot water supply burner 7 is performed as in the conventional example. In burner combustion, in this embodiment, rotation control of the combustion fan 5 is performed based on the fan rotation control mode set by the fan rotation mode switching means 34. Further, the length L of the extension cylinder 51 is obtained by the extension cylinder length detection unit 31 based on the fan rotation control mode set by the fan rotation mode switching means 34, and the value of the length L of the extension cylinder 51 is calculated. It is added to the valve throttle amount control means 28. When the hot water supply combustion is stopped, the standby time from the hot water supply combustion stop to the start of re-heating is measured by the standby time measuring unit 29, and this standby time is added to the valve throttle amount control means.
[0035]
Then, the valve throttling amount control means 28 obtains the water amount control valve throttling amount control mode selected according to the length L of the extension cylinder 51 obtained by the extension cylinder length detection section 31 and the waiting time measurement section 29. Depending on the waiting time, the amount of throttling of the water amount control valve 16 that is on standby for re-watering is controlled. For example, the length L of the extension cylinder 51 is L ₁ L ₂ Less than (L ₁ ≦ L <L ₂ ), The P-mode water amount control valve throttle amount control mode shown in FIG. 2A is selected, and the waiting time is T in FIG. _M As shown in FIG. ₁ Greatly controlled.
[0036]
The length L of the extension cylinder 51 is L ₂ L _Three Less than (L ₂ ≦ L ≦ L _Three ), Since the Q-mode water amount control valve throttle amount control data in FIG. 2A is selected, the standby time is equal to T as described above. _M Even in this case, the amount of restriction of the water amount control valve 16 at this time is A ₁ Smaller than A ₂ In addition, the length L of the extension cylinder 51 is L _Three L _Four Below (L _Three ≦ L ≦ L _Four ), Since the R mode water amount control valve throttling amount control mode is selected, the standby time is the same as that described above. _M Even so, the throttle amount of the water control valve 16 is even smaller. _Three Set and controlled.
[0037]
The length L of the extension cylinder 51 is set to L by setting the throttle amount of the water amount control valve 16 as described above. ₁ L ₂ Is less than a small length, so the waiting time is T _M When the amount of after-boiling when the time has passed is small, the throttle amount of the standby water amount control valve 16 provided for re-bathing is set to A in FIG. ₁ By increasing the value to stand by and waiting as shown by the characteristic line b in FIG. 3A, the amount of incoming hot water to the hot water supply heat exchanger 2 immediately after re-heating is reduced to reduce the amount of outgoing hot water. Then, for example, as shown by the characteristic line b 'in the figure, when the amount of water entering the hot water supply heat exchanger 2 is increased without increasing the throttle amount of the water amount control valve 16, the water flow rate of the hot water supply heat exchanger 2 is increased. The drop in the hot water temperature does not increase as in the residual hot water temperature characteristic (characteristic line a ′) due to, and the rate of the decrease in the residual hot water temperature is suppressed as shown in the characteristic line a in FIG. For this reason, the decrease in the residual hot water temperature coincides with the increase in the incoming water temperature shown in the characteristic line c in the figure, and as shown in the characteristic line s in the figure, the hot water discharge temperature that is substantially close to the hot water supply set temperature. Is done.
[0038]
On the other hand, for example, the length L of the extension cylinder 51 is L. _Three L _Four When the following is long, the waiting time T _M Since the subsequent boiling of the hot water supply heat exchanger 2 becomes larger and longer, for example, as shown in FIG. 3B, the throttle amount of the water amount control valve 16 by the valve throttle amount control means 28 is reduced. By increasing the amount of water entering the hot water heat exchanger 2, the remaining hot water temperature characteristics of the hot water heat exchanger 2 by passing water even if the rate of decrease in the hot water temperature due to the water entering the hot water heat exchanger 2 increases. Is as shown by the characteristic line a in FIG. 5, and the decrease in the hot water temperature and the increase in the incoming water temperature are almost the same. For this reason, hot water with a hot water temperature substantially equal to the hot water supply set temperature is performed in a state where the amount of hot water is large.
[0039]
According to this embodiment, according to the length L of the extension cylinder 51, the throttle amount of the standby water amount control valve 16 provided for re-bathing is reduced as the length L increases. As the length L is shortened, the amount of throttle of the standby water amount control valve 16 is controlled to be large, so that the length of the extension cylinder 51 becomes longer and the hot water supply heat exchanger 2 that increases as the length L increases. It is possible to control the amount of incoming water, so that hot water can be discharged at a temperature substantially equal to the hot water supply set temperature, and it is not necessary to increase the throttle amount of the water amount control valve 16. Since the amount of restriction of the water amount control valve 16 is not excessively increased, it is possible to eliminate the inconvenience caused by the amount of discharged hot water being reduced by excessive control of the amount of restriction of the water amount control valve 16.
[0040]
In addition, this invention is not limited to the said embodiment example, Various aspects can be taken. For example, in the above-described embodiment, as the water amount control valve throttle amount control data, as shown in FIG. 2A, the standby is performed according to the parallel length L of the intake extension conduit 52 and the exhaust extension conduit 53. Although the three-stage water amount control valve throttle amount control mode using time as a parameter is given, the water amount control valve throttle amount control data is not necessarily given by three (three steps) water amount control valve throttle amount control modes. . For example, two or four or more water amount control valve throttle amount control modes corresponding to the juxtaposed length L may be provided, or the water amount control valve throttling amount is continuously variable according to the juxtaposed length L. It is good also as water quantity control valve throttle amount control data determined so that it may do. Further, the water amount control valve throttle amount control data is not necessarily given by the graph data, but may be given by table data, an arithmetic expression, or the like.
[0041]
Further, as shown by the broken line in FIG. 1, the valve throttle amount control means 28 takes in the incoming water temperature to the hot water supply heat exchanger 2 detected by the incoming water temperature sensor 10 and prepares for re-draining as the incoming water temperature rises. Alternatively, the throttle amount of the water amount control valve 16 during standby may be reduced, and the throttle amount of the water amount control valve 16 may be increased as the incoming water temperature decreases.
[0042]
This is because, when the temperature of the incoming water to the hot water supply heat exchanger 2 is low, the ratio of the decrease in the hot water temperature due to the incoming water to the hot water supply heat exchanger 2 is large, so the standby time and the intake extension pipe 52 and the exhaust extension pipe Even when the parallel length L of the passages 53 is the same, the cooling of the remaining hot water temperature in the hot water supply heat exchanger 2 due to the passage of water through the hot water supply heat exchanger 2 is large. Therefore, for example, as shown in FIG. 9, when the throttle amount of the water amount control valve 16 is reduced, the residual hot water temperature in the hot water supply heat exchanger 2 is cooled at once, and the increase in the incoming water temperature is included in the decrease in the residual hot water temperature. Due to this delay Δt, undershoot hot water may be discharged as shown by the characteristic line s in FIG. On the other hand, when the temperature of the incoming water to the hot water supply heat exchanger 2 is high, the rate of decrease in the hot water temperature due to the incoming water to the hot water supply heat exchanger 2 is small. There is a small decrease in the remaining hot water temperature due to the incoming water, and there is a case where it is not particularly necessary to increase the throttle amount of the water amount control valve 16.
[0043]
Therefore, in addition to the parallel length of the intake extension pipe 52 and the exhaust extension pipe 53 and the standby time, the throttle amount of the water quantity control valve 16 is controlled in consideration of the incoming water temperature to the hot water heat exchanger 2. It is possible to stabilize the re-heated hot water temperature more reliably, and to provide a combustion device that is easy to use. In this way, when the amount of throttle of the water amount control valve 16 is controlled in consideration of the temperature of water entering the hot water supply heat exchanger 2, for example, the intake extension pipe 52 and the exhaust extension pipe 53 are provided in the data storage unit 30. The throttle amount of the water amount control valve 16 by the valve throttle amount control means 28 can be controlled by giving control data using the length L, the standby time, and the incoming water temperature of the hot water heat exchanger 2 as parameters.
[0044]
Further, in the above embodiment example, the standby time measuring unit 29 determines the start of re-watering based on the flow rate detection signal of the flow sensor 9, but the standby time measuring unit 29 uses the control operation information of the combustion control unit 24 as information. On the basis of this, the start of re-watering may be detected, or a sensor such as a running water switch (hot water check switch) for detecting running water is provided on the hot water tap 1 side of the hot water supply pipe 4 and the sensor output of this sensor is used to The start of the hot water may be detected.
[0045]
Further, in the above-described embodiment, the extension cylinder length detection unit 31 is configured so that the length of the extension cylinder 51 set in the fan rotation mode switching unit 34 (the length of the parallel arrangement of the intake extension pipe 52 and the exhaust extension pipe 53). The length of the extension cylinder L is detected based on the fan rotation control mode corresponding to L. For example, an air volume sensor for detecting the fan air volume of the combustion fan 5 is provided, and based on the detected fan air volume of the air volume sensor. The length L of the extension cylinder 51 may be detected. This is because, for example, when the combustion fan 5 is rotationally driven at a predetermined fixed fan speed, the air flow sensor is increased by increasing the pipe resistance of the extension cylinder 51 as the length L of the extension cylinder 51 increases. Therefore, the length of the extension cylinder 51 can be detected based on the detected fan air volume of the air volume sensor.
[0046]
Further, an extension cylinder length input means is provided in the combustion equipment, and the length of the extension cylinder 51 is inputted by a contractor or the like at the time of construction of the combustion equipment, etc., and the valve throttle amount control means 28 is based on this input signal. The length of the extension cylinder 51 may be determined, and the throttle amount of the water amount control valve 16 may be controlled based on the determination result.
[0047]
Further, in the above embodiment, the extension cylinder 51 has a double pipe structure of the intake extension pipe 52 and the exhaust extension pipe 53. However, as shown in FIG. Further, a double pipe structure in which the exhaust extension pipe 53 is adjacent may be used. In this case, since only the part that goes outside becomes a double pipe (a part where intake and exhaust come into contact), the setting of the extension cylinder length for improving undershoot and overshoot is determined by L ′. Further, as shown in FIG. 6 (b), the air intake extension pipe 52 may be omitted, and instead the outside air may be taken into the instrument case 26 via the louver 49, or arranged outdoors. If the combustion device is manufactured for this purpose, the intake extension pipe 53 and the exhaust extension pipe 53 are omitted. Instead, the instrument case 26 is indicated by the same louver 49 and the broken line in FIG. In this manner, an exhaust hole 48 communicating with the exhaust pipe line 55 may be provided, outside air may be taken in via the louver 49, and exhaust gas may be discharged outside via the exhaust port 48.
[0048]
As described above, in a hot water heater having only the exhaust extension pipe 53 or having neither the intake extension pipe 52 nor the exhaust extension pipe 53, the indoor control device shown in the above embodiment is used. When using the same control as that for No. 20, the temperature of the intake air is not heated to a high temperature due to the heat of the exhaust gas. (Length judgment) is controlled as the shortest.
[0049]
Further, in the above-described embodiment, the hot water supply burner 7 is a combustion surface switching type multi-stage capacity type hot water supply burner 7 having combustion surfaces of A, B, and C surfaces, and the combustion equipment is a water heater having this hot water supply burner 7. However, the combustion apparatus of the present invention does not necessarily include a multistage capacity hot water supply burner, and may be a hot water heater including a hot water supply burner having a single stage combustion surface.
[0050]
Furthermore, in the above embodiment, a single-function water heater provided with the hot-water supply burner 7 has been described as a combustion device. However, the combustion device of the present invention is not necessarily a single-function water heater. It is good also as a compound water heater provided with a reheating function, and is applied to various combustion equipment provided with a hot water burner and a combustion fan.
[0051]
【The invention's effect】
According to the present invention, the after-boiling characteristic of the hot water supply heat exchanger at the time of re-draining has the parallel arrangement of the intake extension pipe provided in the combustion device and the exhaust extension pipe arranged in parallel in the vicinity of the intake extension pipe. Pay attention to the fact that the longer the juxtaposed length is, the larger the post-boiling is, and the shorter the juxtaposed length is, the smaller the post-boiling is. Since the throttle amount of the standby water amount control valve is reduced and the parallel arrangement length is reduced, the throttle amount of the standby water amount control valve is controlled to be larger. The amount of remaining hot water in the hot water heat exchanger is reduced by waiting for a larger amount of squeezed water, reducing the amount of hot water at the time of re-hot water, and preventing a large amount of water from entering the hot water heat exchanger immediately after re-watering. Suppresses the rapid drop in the temperature, thereby suppressing the undershoot hot water It is possible to re-pouring hot water temperature stabilization Te.
[0052]
Further, according to the present invention, as described above, for example, as the length of the parallel arrangement of the intake extension pipe and the exhaust extension pipe becomes longer, the throttle amount of the standby water amount control valve provided for re-bathing is reduced. However, when the parallel arrangement length is long, the boiling point of the hot water supply heat exchanger is large, so that the amount of throttle of the water amount control valve is small, so that a large amount of water enters the hot water supply heat exchanger immediately after re-watering and the hot water supply heat Even if the hot water in the exchanger is suddenly cooled, there is no risk of undershoot during re-bathing, and more hot water can be used immediately after re-bathing as much as the amount of water control valve throttle is reduced. Can improve usability.
[0053]
Further, according to the present invention, the water amount control valve throttle amount control data is given by the function data of the water amount control valve throttle amount with the standby time from the hot water combustion stop of the hot water burner to the start of re-draining as a parameter. It is possible to control the throttle amount of the water amount control valve in accordance with the after-boiling characteristics of the hot water heat exchanger at different re-heating times depending on the The effect can be exhibited very effectively.
[0054]
Further, the valve throttle amount control means takes in the incoming water temperature to the hot water heat exchanger, and as the incoming water temperature becomes higher, the throttle amount of the standby water amount control valve provided for the re-draining water is reduced to lower the incoming water temperature. According to the present invention in which the throttle amount of the water amount control valve is increased, the amount of the water amount control valve is increased when the incoming water temperature is low to reduce the amount of hot water at the time of re-bathing. By preventing a large amount of water from entering the hot water heat exchanger, it is possible to suppress a sudden drop in the residual hot water temperature in the hot water heat exchanger. The hot water in the hot water supply heat exchanger is not rapidly cooled even if a large amount of water enters the hot water supply heat exchanger immediately after re-watering. Sometimes, reduce the amount of water control valve throttling. It is possible to further improve the ease of use.
[0055]
Further, according to the present invention, wherein the combustion fan is provided on the exhaust side of the combustion chamber, and the exhaust of the hot water burner combustion is sucked out by driving the combustion fan, the exhaust gas of the hot water burner combustion is sucked out by driving the combustion fan. Therefore, exhaust gas can be discharged to the outside more efficiently.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a main part of a control unit of an embodiment of a combustion apparatus according to the present invention.
FIG. 2 is a graph showing an example of water amount control valve throttle amount control data given to the combustion apparatus of the embodiment.
FIG. 3 is an explanatory view showing an example of a water amount control valve throttle amount control operation by the combustion device of the embodiment and an example of a hot water temperature change caused by the control operation.
FIG. 4 is a graph showing an example of the relationship between the fan rotation speed and the combustion capacity for each fan rotation control mode given to the combustion device of the embodiment.
FIG. 5 is a system configuration diagram showing a water heater that is a combustion device of the embodiment.
FIG. 6 is an explanatory diagram showing another system configuration example of intake and exhaust means of a combustion device.
FIG. 7 is a system configuration diagram showing a general water heater.
FIG. 8 is an explanatory diagram showing an example of a control operation for lowering the hot water temperature in the hot water supply heat exchanger by controlling the amount of throttling of the water amount control valve during re-heating.
FIG. 9 is a graph showing a change in re-heated hot water temperature when re-watering is performed with the water amount control valve fully opened when the temperature of water entering the hot water supply heat exchanger is low.
[Explanation of symbols]
2 Hot water heat exchanger
7 Hot water burner
10 Water temperature sensor
16 Water control valve
28 Valve throttle control means
29 Standby time measurement unit
30 Data storage
31 Extension tube length detector
51 Extension tube
52 Intake extension line
53 Exhaust extension pipe

Claims

A hot water supply burner that heats and burns a hot water supply heat exchanger, a combustion fan that supplies and discharges hot water burner combustion, and a water amount control valve that adjusts the amount of water passing through the hot water supply heat exchanger, the water amount control valve when hot water combustion stops In the type of combustion equipment that waits as a predetermined throttle amount and performs re-heating, the water amount control valve throttle amount control data determined according to the parallel length of the intake extension pipe and the exhaust extension pipe A combustion apparatus, comprising: a valve throttle amount control means for controlling a throttle amount of the standby water amount control valve.

A hot water supply burner that heats and burns a hot water supply heat exchanger, a combustion fan that supplies and discharges hot water burner combustion, and a water amount control valve that adjusts the amount of water passing through the hot water supply heat exchanger, the water amount control valve when hot water combustion stops In a combustion device of the type that performs re-bathing while waiting for a predetermined amount of restriction as a predetermined amount, an intake extension pipe that is led out from the body of the appliance of the combustion device and takes in external air into the appliance by driving the combustion fan And an exhaust extension pipe that is juxtaposed in the vicinity of the intake extension pipe and exhausts exhaust gas from the hot water supply burner to the outside by driving a combustion fan. The intake extension pipe and the exhaust extension pipe are juxtaposed. Based on the water amount control valve throttle amount control data determined according to the length, as the parallel length of the intake extension pipe and the exhaust extension pipe becomes longer, Aperture length is reduced Burning appliance, wherein the large valves throttle amount control means the throttle amount of water control valve waiting is provided as shorter.

The water amount control valve throttle amount control data is given by function data of a water amount control valve throttle amount with a waiting time from the hot water combustion stop of the hot water supply burner to the start of re-watering as a parameter. 2. Combustion equipment according to 2.

The valve throttle amount control means takes in the incoming water temperature to the hot water heat exchanger and decreases the throttle amount of the standby water amount control valve prepared for the re-watering as the incoming water temperature increases, and the incoming water temperature decreases as the incoming water temperature decreases. 4. A combustion apparatus according to claim 1, wherein the amount of restriction of the water amount control valve is increased.

The combustion apparatus according to any one of claims 1 to 4, wherein a combustion fan is provided on an exhaust side of the combustion chamber, and exhaust of hot water burner combustion is sucked by driving the combustion fan. .