JP4508487B2

JP4508487B2 - Combustion device

Info

Publication number: JP4508487B2
Application number: JP2001252340A
Authority: JP
Inventors: 達範原; 博之光冨; 禎齊藤
Original assignee: Osaka Gas Co Ltd
Current assignee: Osaka Gas Co Ltd
Priority date: 2001-08-23
Filing date: 2001-08-23
Publication date: 2010-07-21
Anticipated expiration: 2021-08-23
Also published as: JP2003065609A

Description

【０００１】
【発明の属する技術分野】
本発明は、潜熱回収可能な熱交換器を備えた燃焼装置に関する。
【０００２】
【従来の技術】
温水を給湯する給湯用燃焼装置は、燃焼バーナによって生成される燃焼排気ガスとの間で熱交換を行う熱交換器を備え、この熱交換器の流入側に水道水送給流路が接続され、その排出側に出湯流路が接続されている。この熱交換器においては、水道水送給路を通して水道水が熱交換器に送給され、熱交換器において燃焼排気ガスとの間で熱交換されて温められた温水が出湯流路を通して下流側に送給される。
【０００３】
この種の給湯用燃焼装置においては、熱効率を高めるために、燃焼排気ガスの排気顕熱及び排気潜熱の回収が可能である熱交換器を備えたものが実用化されだしている。潜熱回収可能な熱交換器は、通常、主熱交換器部及び副熱交換器部を備え、主熱交換器部において、燃焼排気ガス中の顕熱の回収が行われ、また副熱交換器部において、燃焼排気ガス中の顕熱のみならず、燃焼排気ガス中の水蒸気が保有している潜熱の回収が行われれる。
【０００４】
この潜熱回収型の燃焼装置では、副熱交換器部における熱交換の際に、燃焼排気ガス中の水蒸気の潜熱が奪われるので、この副熱交換器部にて水蒸気が凝縮して結露する。そして、発生した結露水（凝縮水）は、ドレン排水手段により集められてドレン水として外部に排出される。
【０００５】
このドレン水は、燃焼排気ガス中の窒素酸化物や、硫黄酸化物を吸収してｐＨ３〜４程度の酸性水となっており、それ故に、そのまま排出すると排水管の金属部分の腐食やコンクリートの劣化等につながるため、発生したドレン水のｐＨ値を排水基準の５〜９の範囲に中和する必要がある。
【０００６】
このようなことから、従来、ドレン水を排水するためのドレン排水流路に、固体のアルカリ性中和剤を充填した中和器が設けられ、この中和器にてドレン水を中和した後、排水を行っていた。しかし、この中和器を用いる方式では、長期間使用すると目詰りが発生してドレン水の排水能力が低下したり、充填した中和剤が消耗して中和性能が低下するといった問題点があった。
【０００７】
そこで、このような不都合を解消するために、中和剤として水道水を利用するようにしたものが提案されている（例えば、実開昭５７−２８２３９号公報参照）。この燃焼装置においては、熱交換器に水道水を送給する水道水送給流路とドレン排水流路とが水道水供給流路を介して接続され、この水道水供給流路に流水調節弁が配設されている。流水調節弁が開状態になると、水道水送給流路を流れる水道水の一部が水道水供給流路を通してドレン排水流路に供給されてドレン水に混入され、その開度によって水道水供給流路を流れる水道水の供給量が調整され、これによって、水道水に含まれているアルカリ成分がドレン水の酸性成分と反応し、ドレン水が水道水によって希釈、中和される。
【０００８】
【発明が解決しようとする課題】
また、最近では、燃焼バーナの燃焼熱量からドレン水の発生量を演算により求め、求めたドレン水の発生量から水道水供給手段によって供給すべき水道水の供給量、換言すると流水調整弁の開度を決定するようにしたものがあるが、制御回路の構成が複雑になるとともに、流水調節弁の開度、即ち水道水の供給量を制御するための制御が複雑になり、このことに起因して製造コストが高くなるという問題がある。
【０００９】
本発明の目的は、簡単な構成及び制御でもって、水道水供給手段からドレン排水手段に供給される水道水の供給量を制御することができる燃焼装置を提供することである。
【００１０】
本発明は、燃焼排気ガスを生成する燃焼バーナと、燃焼排気ガスとの間で熱交換を行って顕熱及び潜熱を回収する熱交換器と、前記熱交換器の熱交換により生じたドレン水を集めて排出するためのドレン排水手段と、前記ドレン排水手段に水道水を供給するための水道水供給手段と、前記水道水供給手段からの水道水の供給量を制御するための制御手段とを具備し、前記水道水供給手段から前記ドレン排水手段のドレン排出流路へ水道水を供給することによって、前記ドレン排出流路を流れるドレン水を中和するようにした燃焼装置であって、
前記燃焼バーナは複数個のバーナ部から構成され、前記燃焼バーナに燃料用ガスを供給するガス供給流路の下流側部は主供給流路部と分岐供給流路部に分岐され、前記主供給流路部及び前記分岐供給流路部が対応する前記バーナ部に夫々接続されており、
前記ガス供給流路における前記主供給流路部及び前記分岐供給流路部よりも上流側には元ガス開閉弁が配設されているとともに、前記分岐流路部にはガス切換弁が配設されており、
前記水道水供給手段は、水道水を前記ドレン排水手段の前記ドレン排水流路に供給し、その一部が主流路部と分岐流路部に分岐された水道水供給流路と、前記主流路部を通して水道水の供給、供給停止を行う水開閉弁と、前記分岐流路部を通して水道水の供給、供給停止を行う切換開閉弁とを備えており、
前記制御手段は、前記元ガス開閉弁及び前記ガス切換弁の開閉状態に対応して前記水開閉弁及び切換開閉弁を開閉制御することを特徴とする燃焼装置である。
【００１１】
本発明に従えば、熱交換器として燃焼排気ガスの顕熱及び潜熱を回収する熱交換器が用いられ、この熱交換器にて発生したドレン水はドレン排水手段のドレン排水流路を通して排出され、また水道供給手段からの水道水がこのドレン排水流路に供給され、水道水供給手段からの水道水によってドレン水が希釈、中和される。燃焼バーナは複数個のバーナ部から構成され、燃焼バーナに燃料用ガスを供給するガス供給流路（主供給流路部及び前記分岐供給流路部より上流側の部位）に元ガス開閉弁が配設され、ガス供給流路の下流側部の分岐供給流路部にガス切換弁が配設される。また、水道水供給手段は、主流路部と分岐流路部を有する水道水供給流路と、水開閉弁と、水切換開閉弁とを有し、水開閉弁が開状態になると、主流路部を通して水道水をドレン排水手段に供給し、更に切換開閉弁が開状態になると、分岐流路部からも水道水をドレン排水手段に供給する。このように元ガス開閉弁及びガス切換弁の開閉状態に基づいて水開閉弁及び切換開閉弁を制御するので、簡単な構成及び簡単な制御でもって水道水の供給量を所要の通りに制御することができ、水道水の無駄な使用を抑えることができる。
【００１２】
例えば、元ガス開閉弁が開状態にあってガス切換弁が閉状態にあるときには、燃焼バーナは小燃焼状態にあり、制御手段は、水道水の供給量が少なくなるように、この状態に対応して水開閉弁のみを開状態にし、これによって、主流路部を通して比較的少量の水道水が供給され、また例えば、元ガス開閉弁及びガス切換弁が開状態のときには、燃焼バーナは大燃焼状態にあり、制御手段は、水道水の供給量が多くなるように、この状態に対応して水開閉弁及び切換開閉弁を開状態にし、これによって、主流路部及び分岐流路部を通して比較的多量の水道水が供給され、このように簡単な制御でもって、水道水の供給を所要の通りに制御することができる。
尚、ガス供給流路の分岐供給流路部を２つ以上設けた場合、水道水供給流路においても、各分岐供給流路に対応して分岐流路部を設け、これら分岐流路部に切換開閉弁を配設するようにすることができ、水道水の供給制御を簡単化するために、２つ以上の分岐供給流路部のガス切換弁の開閉に基づいて、一つの分岐流路部の切換開閉弁を開閉するようにしてもよい。
【００１５】
また、本発明では、前記ガス供給流路の下流側部には複数の分岐供給流路部が設けられ、前記複数の分岐供給流路部にそれぞれ前記ガス切換弁が配設されており、また前記水道水供給流路の前記一部には、前記ガス供給流路の前記分岐供給流路部の数に対応した複数の分岐流路部が設けられ、前記複数の分岐流路部にそれぞれ前記切換開閉弁が設けられており、前記制御手段は、前記ガス供給流路の前記複数の分岐供給流路部の前記ガス切換弁の開閉状態に対応して、前記水道水供給流路の前記複数の分岐流路部の前記切換開閉弁を開閉制御することを特徴とする。
【００１６】
本発明に従えば、ガス供給流路は複数の分岐供給流路部を有し、各分岐供給流路部にガス切換弁が配設されている。また、ガス供給流路のこのような構成に対応して、水道水供給流路には分岐供給流路部の数に対応する複数の分岐流路部が設けられ、各分岐流路部に切換開閉弁が配設されている。そして、制御手段は、ガス供給流路の複数の分岐供給流路部のガス切換弁の開閉状態に対応して、水道水供給流路の分岐流路部の切換開閉弁を開閉制御する、例えば特定の分岐供給流路部のガス切換弁が開状態であるとこれに対応する水道水供給手段の分岐流路部の切換開閉弁を開状態にして水道水を供給するので、簡単な制御でもって水道水の供給量を所要の通りに制御することができる。
【００１７】
また、本発明では、暖房装置に温水を供給するための暖房用燃焼装置部と、温水を給湯するための給湯用燃焼装置部とから構成され、前記暖房用燃焼装置部及び前記給湯用燃焼装置部は、それぞれ、燃焼排気ガスを生成する燃焼バーナと、燃焼排気ガスとの間で熱交換を行って顕熱及び潜熱を回収する熱交換器と、前記熱交換器の熱交換により生じたドレン水を集めて排出するためのドレン排水手段とを備え、前記暖房装置用燃焼装置部の前記ドレン排水手段と前記給湯装置用燃焼装置部の前記ドレン排水手段とがドレン水を合流して排水するように接続され、更に、ドレン水を希釈、中和するために用いる水道水を供給するための水道水供給手段と、前記水道水供給手段を制御する制御手段とが設けられた燃焼装置であって、
前記暖房用燃焼装置部の前記燃焼バーナには燃料用ガスを供給する暖房用ガス供給流路が接続され、前記暖房用ガス供給流路には暖房用元ガス開閉弁が配設されており、
前記給湯用燃焼装置部の前記燃焼バーナには燃料用ガスを供給する給湯用ガス供給流路が接続され、前記給湯用ガス供給流路には給湯用元ガス開閉弁が配設されており、
前記制御手段は、前記暖房用元ガス開閉弁及び前記給湯用元ガス開閉弁の開閉状態に基づいて前記水道水供給手段から供給される水道水の供給量を制御することを特徴とする燃焼装置である。
【００１８】
本発明に従えば、燃焼装置は暖房用燃焼装置部と給湯用燃焼装置部から構成され、これら燃焼装置部のドレン排水手段が相互に接続され、水道水供給手段からの水道水がドレン排水手段に供給されるように構成されている。暖房用燃焼装置部の燃焼バーナに燃料用ガスを供給する暖房用ガス供給流路には暖房用元ガス開閉弁が設けられ、給湯用燃焼装置部の燃焼バーナに燃料用ガスを供給する給湯用ガス供給流路には給湯用元ガス開閉弁が配設され、制御手段は暖房用元ガス開閉弁及び給湯用元ガス開閉弁の開閉状態に基づいて水道水供給手段からの水道水の供給量を制御する。このように暖房用燃焼装置部及び給湯用燃焼装置部の作動、非作動に基づいて水道水の供給量を制御するので、簡単な構成及び簡単な制御でもって水道水の供給量を所要の通りに制御することができ、水道水の無駄な使用を抑えることができる。
【００１９】
例えば、給湯用元ガス開閉弁が開状態のとき（給湯用燃焼装置部が作動状態のとき）には、その熱交換器において結露が発生し易く、ドレン水の排水量が多くなり、それ故に、制御手段は水道水の供給量が多くなるように水道水供給手段を制御し、また暖房用元ガス開閉弁が開状態のとき（暖房用燃焼装置部が作動状態のとき）には、その熱交換器において発生する結露は少なく、ドレン水の排水量も少なくなり、それ故に、制御手段は水道水の供給量が少なくなるように水道水供給手段を制御する。
【００２０】
また、本発明では、前記水道水供給手段は、水道水を供給する第１及び第２水道水供給流路と、前記第１及び第２水道水供給流路に配設された第１及び第２水開閉弁とを備え、前記制御手段は、前記暖房用元ガス開閉弁及び前記給湯用元ガス開閉弁の開閉状態に対応して、前記第１及び第２水開閉弁を開閉制御することを特徴とする。
【００２１】
本発明に従えば、水道水供給手段は第１及び第２水道水供給流路を備え、第１及び第２水道水供給流路に第１及び第２水開閉弁が配設されている。そして、制御手段は暖房用元ガス開閉弁及び給湯用元ガス開閉弁の開閉状態に対応して第１及び第２水開閉弁を開閉制御する、例えば暖房用元ガス開閉弁（又は給湯用元ガス開閉弁）が開状態のときには第１水開閉弁（又は第２水開閉弁）を開状態にし、また暖房用暖房用元ガス開閉弁及び給湯用元ガス開閉弁が開状態のときには第１及び第２水開閉弁を開状態にするので、発生したドレン水を中和するのに必要な量の水道水を簡単な制御でもって供給することができる。
【００２２】
更に、本発明では、前記水道水供給手段は、前記燃焼バーナの燃焼終了後所定時間経過した後に水道水の供給を停止することを特徴とする。
本発明に従えば、水道水供給手段からの水道水の供給停止は、燃焼バーナの燃焼終了後所定時間経過後に行われる。ドレン水のドレン排水流路を通しての排水は、燃焼バーナの燃焼終了後少し時間が経過するまで行われるので、このように制御することによって、ドレン水を所要の通り中和することができる。尚、この所定時間は１〜３分程度に設定される。
【００２３】
【発明の実施の形態】
以下、添付図面を参照して、本発明に従う燃焼装置の実施形態について説明する。
第１の実施形態
まず、図１〜図４を参照して、本発明に従う燃焼装置の第１の実施形態について説明する。図１は、第１の実施形態の燃焼装置を簡略的に示す簡略図であり、図２は、図１の燃焼装置における第１及び第２ガス切換弁の開閉状態と燃料用ガスの供給量との関係を示す図であり、図３は、図１の燃焼装置における第１及び第２ガス切換弁の開閉状態と水開閉弁並びに第１及び第２切換開閉弁の開閉状態との関係を示す図であり、図４は、図１の燃焼装置の制御の一部を示すフローチャートである。
【００２４】
図１において、図示の給湯用燃焼装置２は装置ハウジング４を備え、この燃焼ハウジング４内に燃焼室６が規定されている。この燃焼室６の上方には図１において横方に延びる排気流路８が形成され、排気流路８の下流端には排気口１０が設けられている。燃焼室６の下部には燃焼バーナ１２が配設され、図示の形態では、この燃焼バーナ１２が第１〜第３バーナ部１４，１６，１８から構成されている。また、燃焼室６の下端部には送風ファン２０が設けられ、この送風ファン２０は燃焼用空気を燃焼室６に送給する。
【００２５】
燃焼バーナ１２には、ガス供給流路２２を通して燃料用ガス（例えば、都市ガス、ＬＰガス）が供給される。ガス供給流路２２の下流側部は主供給流路部２４並びに第１及び第２分岐ガス供給流路部２６，２８に分岐され、主ガス供給流路部２４が第１バーナ部１４に接続され、第１分岐供給流路部２６が第２バーナ部１６に接続され、第２分岐供給流路部２８が第３バーナ部１８に接続されている。ガス供給流路２２における主供給流路部２４並びに第１及び第２分岐供給流路部２６，２８よりも上流側には、上流側から元ガス開閉弁３０及び比例弁３１が順次設けられ、第１分岐供給流路部２６には第１ガス切換弁３２が設けられ、第２分岐供給流路部２８には第２ガス切換弁３４が設けられている。元ガス開閉弁３０はガス供給流路２２を開閉して燃料用ガスの供給、供給停止を行い、比例弁３１はガス供給流路２２を流れる燃料用ガスの供給量を制御し、また第１ガス切換弁３２は第１分岐供給流路部２６を開閉して第２バーナ部１６への燃料用ガスの供給、供給停止を行い、第２ガス切換弁３４は第２分岐供給流路部２８を開閉して第３バーナ部１８への燃料用ガスの供給、供給停止を行う。
【００２６】
このように構成されているので、図２（ａ）及び（ｂ）で示すように、燃焼バーナ１２の燃焼状態は４段階、即ちＡ〜Ｄ領域に制御される。元ガス開閉弁３０のみが開状態となるＡ領域では、燃料用ガスが主供給流路部２４を通して第１バーナ部１４に送給され、燃焼バーナ１２は、第１バーナ部１４のみにて燃焼する小燃焼状態となる。元ガス開閉弁３０及び第１ガス切換弁３２が開状態となるＢ領域では、燃料用ガスが主供給流路部１２及び第１分岐供給流路部２６を通して第１及び第２バーナ部１４，１６に送給され、燃焼バーナ１２は、第１及び第２バーナ部１４，１６にて燃焼する中の小燃焼状態となる。元ガス開閉弁３０及び第２ガス切換弁３４が開状態となるＣ領域では、燃料用ガスが主供給流路部１２及び第２分岐供給流路部２８を通して第１及び第３バーナ部１４，１８に送給され、燃焼バーナ１２は、第１及び第３バーナ部１４，１８にて燃焼する中の大燃焼状態となる。また、元ガス開閉弁３０並びに第１及び第２ガス切換弁３２，３４が開状態となるＤ領域では、燃料用ガスが主供給流路部２４並びに第１及び第２分岐供給流路部２６，２８を通して第１〜第３バーナ部１４，１６，１８に送給され、燃焼バーナ１２は、第１〜第３バーナ部１４，１６，１８にて燃焼する大燃焼状態となる。燃焼バーナ１２の燃焼によって発生する燃焼排気ガスは、燃焼室６及び排気流路８を通して流れて排気口１０から外部に排出される。
【００２７】
燃焼室６の下流側の排気流路８には、燃焼排気ガス中の顕熱及び潜熱を回収する熱交換器３６が配設されている。熱交換器３６は主熱交換器部３８と副熱交換器部４０から構成され、燃焼排気ガスの流れ方向に見て、上流側に主熱交換器部３８が配設され、下流側に副熱交換器部４０が配設されている。
【００２８】
この燃焼装置２は、台所の流し台、洗面台等に設けられるカラン（図示せず）に温水を給湯するための装置として用いられ、水道水埋設管の如き水道水供給源（図示せず）からの水道水を供給する水道水送給流路４２が熱交換器３６の副熱交換器部４０に接続され、カランに接続される出湯流路４４がその主熱交換器部３８に接続され、水道水送給流路４２には水道水開閉弁４６が配設されている。
【００２９】
このように構成されているので、カラン（図示せず）を開栓すると、水道水送給流路４２の水道水開閉弁４６が開状態になり、水道水送給流路４２からの水道水は、まず、熱交換器３２の副熱交換器部４０に送給され、この副熱交換器部４０にて燃焼排気ガスとの間で熱交換され、燃焼排気ガス中の顕熱及び潜熱の回収が行われる。この副熱交換器部４０にて熱交換された温水は、次に、主熱交換器部３８に送給され、この主熱交換器部３８にて燃焼排気ガスとの間で熱交換され、燃焼排気ガス中の顕熱の回収が行われる。このように熱交換器３６にて加熱された温水は、出湯流路４４を通してカラン（図示せず）に送給され、開栓したカランから出湯する。
【００３０】
上述した燃焼装置２においては、熱交換器３６の副熱交換器部４０にて燃焼排気ガス中の潜熱も回収するので、この副熱交換器部４０に結露が発生するようになり、このことに関連して、副熱交換器部４０にて結露した水をドレン水として外部に排水するように、ドレン排水手段４８が設けられている。図示のドレン排水手段４８は、装置ハウジング４の所定部位（具体的には、副熱交換器部４０の下方に位置する部位）に設けられたドレン受部５０と、このドレン受部５０から延びるドレン排水流路５２を含んでおり、副熱交換器４０にて結露した水は滴下してドレン受部５０に集められ、このドレン受部５０からドレン排水流路５２を通して外部に排水される。
【００３１】
ドレン排水流路５２には混合槽５３が設けられ、この混合槽５３にドレン水を希釈、中和するために用いる水道水を供給するための水道水供給手段５４が接続されている。水道水供給手段５４は、水道水を供給する水道水供給流路５６を備え、この水道水供給流路５６の一端側が水道水送給流路４２（具体的には、水道水開閉弁４６より上流側部位）に接続され、その他端側がドレン排水流路５２の混合槽５３に接続されている。
【００３２】
この形態では、水道水供給流路５６の下流側部が主流路部５８並びに第１及び第２分岐流路部６０，６２に分岐され、ガス供給流路２０の分岐供給流路部２６，２８の分岐数に対応して水道水供給流路５６の分岐流路部６０，６２が設けられ、これら主流路部５８並びに第１及び第２分岐流路部６０，６２が混合槽５３に接続されている。水道水供給流路５６（具体的には、分岐流路部６０，６２より上流側部位）には水開閉弁６４が配設され、第１及び第２分岐流路部６０，６２には第１及び第２切換開閉弁６６，６８が配設されている。
【００３３】
このように構成されているので、水開閉弁６４が開状態になると、水道水送給流路４２からの水道水は水道水供給流路５６の主流路部５８を通して混合槽５３に少量供給される。水開閉弁６４及び第１切換開閉弁６６（又は第２切換開閉弁６８）が開状態になると、水道水供給流路５６の主流路部５８及び第１分岐流路部６０（又は第２分岐流路部６２）を通して水道水が混合槽５３に中量供給される。この形態では、第１分岐流路部６０を通して流れる供給量よりも第２分岐流路部６２を通して流れる供給量の方が大きくなるように設定され、従って、水開閉弁６４及び第２切換開閉弁６６が開状態のときの方が水道水の供給量が多くなる。また、水開閉弁６４並びに第１及び第２切換開閉弁６６，６８が開状態になると、水道水供給流路５６の主流路部５８並びに第１及び第２分岐流路部６０，６２を通して水道水が混合槽５３に大量供給される。
【００３４】
尚、この実施形態では、水道水供給流路５６の下流側部を分岐させた後にドレン排水流路５２に接続しているが、このような構成に代えて、その中間部において分岐した後これらを合流させ、合流後の水道水供給流路をドレン排水流路５２の混合槽５３に、或いは混合槽５３よりも上流側の部位、又はドレン受部５０に接続するようにしてもよい。また、この実施形態では、水道水供給流路５６の中間部に水開閉弁６４を、また第１及び第２分岐流路部６０，６２に第１及び第２切換開閉弁６６，６８を設けているが、このような構成に代えて、水道水供給流路５６の主流路部５８に水開閉弁６４を設け、第１及び第２分岐流路部６０，６２に第１及び第２切換開閉弁６６，６８を設けるようにしてもよく、このように構成しても上述したと同様に水道水を供給することができる。
【００３５】
この実施形態では、水道水供給手段５４（水開閉弁６４並びに第１及び第２切換開閉弁６６，６８）は制御手段７０によって制御され、この制御手段７０は作動制御手段７２及びタイマ７４を含んでいる。作動制御手段７２は、水開閉弁６４並びに第１及び第２切換開閉弁６６，６８を燃焼バーナ１２の燃焼状態、即ち元ガス開閉弁３０並びに第１及び第２ガス切換弁３２，３４の開閉状態に対応して水開閉弁６４並びに第１及び第２切換開閉弁６６，６８を開閉制御する。この形態では、水開閉弁６４が元ガス開閉弁３０に対応し、第１ガス切換弁３２が第１切換開閉弁６６に対応し、また第２ガス切換弁３４が第２切換開閉弁６８に対応しており、作動制御手段７２は、元ガス開閉弁３０が開状態のときには元ガス開閉弁３０からの開状態の信号に基づいて切換開閉弁６４を開状態にし、第１ガス切換弁３２が開状態のときには第１ガス切換弁３２からの開状態の信号に基づいて第１切換開閉弁６６を開状態にし、また第２ガス切換弁３４が開状態のときには第２ガス切換弁３４からの開状態の信号に基づいて第２切換開閉弁６８を開状態にする。従って、図３に示すように、この作動制御手段７２は、元ガス開閉弁３０が開状態である領域Ａにおいては水開閉弁６４を開状態にし、元ガス開閉弁３０及び第１ガス切換弁３２が開状態である領域Ｂにおいては水開閉弁６４及び第１切換開閉弁６６を開状態にし、元ガス開閉弁３０及び第２ガス開閉弁３４が開状態である領域Ｃにおいては水開閉弁６４及び第２切換開閉弁６８を開状態にし、また元ガス開閉弁３０並びに第１及び第２ガス切換弁６６，６８が開状態である領域Ｄにおいては水開閉弁６４並びに第１及び第２切換開閉弁６６，６８が開状態にする。また、タイマ７４は設定時間を計時する。
【００３６】
次に、図１とともに図４を参照して、上述した燃焼装置２におけるドレン水の中和処理について説明する。燃焼装置２が非作動のときには、元ガス開閉弁３０が閉（オフ）に維持される。このとき、燃焼バーナ１２での燃焼なはく、熱交換器３６の副熱交換器部４０にて結露は発生せず、水開閉弁６４は閉状態に保たれる（ステップＳ−２）。従って、水道水供給手段５４は非作動状態に保たれ、水道水供給流路５４を通してドレン排水流路５２に水道水が供給されることはない。
【００３７】
このような状態から燃焼装置２を作動させると、ステップＳ−１からステップＳ−３に移り、元ガス切換弁３０が開（オン）状態であることに対応して、この元ガス切換弁３０からの信号に基づいて制御手段７０は水開閉弁６４を開状態にする。次に、ステップＳ−４に進み、第１ガス切換弁３２が開状態であるか否かが判断され、第１ガス切換弁３２が閉状態であると、第１切換開閉弁６６も閉状態に保たれるが（ステップＳ−５）、第１ガス切換弁３２が開状態であると、この第１ガス切換弁３２からの信号に基づいて制御手段７０は第１切換開閉弁６６を開状態にする（ステップＳ−６）。次いで、ステップＳ−７に進み、第２ガス切換弁３４が開状態であるか否かが判断され、第２ガス切換弁３４が閉状態であると、第２切換開閉弁６８も閉状態に保たれるが（ステップＳ−８）、第２ガス切換弁３４が開状態であると、この第２ガス切換弁３４からの信号に基づいて制御手段７０は第２切換開閉弁６８を開状態にする（ステップＳ−９）。このように、制御手段７０は、燃焼バーナ１２の燃焼状態、換言すると元ガス開閉弁３０並びに第１及び第２ガス切換弁３２，３４の開閉状態に対応して、水開閉弁６４並びに第１及び第２切換開閉弁６６，６８を図３に示すように開閉制御するので、熱交換器３６の副熱交換器部４０で発生するドレン水を中和するのに適した量の水道水が水道水供給手段５４から混合槽５３に供給される。混合槽５３においては、ドレン排水流路５２からのドレン水と水道水供給手段５４からの水道水とが混合され、ドレン水が水道水によって希釈、中和される。
【００３８】
次に、ステップＳ−１０に進み、元ガス開閉弁３０が開状態であるか否かが判断され、燃焼装置２の作動状態が継続し、元ガス開閉弁１０が開状態に保持されているときにはステップＳ−３に戻り、ステップＳ−３からステップＳ−１０が繰り返し遂行される。これに対して、燃焼装置２の作動が終了し、元ガス開閉弁１０が閉状態になると、タイマ７４が作動し（ステップＳ−１１）、このタイマ７４が所定時間（例えば、１〜３分程度に設定される）を計時するまでその状態た保たれる。そして、タイマ７４がタイムアップする（ステップＳ−１２）と、ステップＳ−１３に進み、水開閉弁６４が閉状態になり、第１及び第２切換開閉弁６６，６８が閉状態になり（ステップＳ−１４）、水道水供給手段５４による水道水の供給が終了する。このように燃焼バーナ１２の燃焼終了後所定時間（タイマ７４がタイムアップする期間）継続して水道水を供給するので、ドレン水が完全に排水するまで水道水供給手段５４による水道水の供給が行われ、発生したドレン水を確実に希釈、中和することができる。
【００３９】
この実施形態では、燃焼バーナ１２を３つのバーナ部１４，１６，１８から構成しているが、この燃焼バーナ１２を２つ又は４つ以上のバーナ部から構成してもよい。例えば、燃焼バーナ１２を２つのバーナ部から構成した場合、一方のバーナ部にガス供給流路の主供給流路部が接続され、他方のバーナ部にその分岐供給流路部が接続され、このガス供給流路に上述したと同様に元ガス開閉弁及びガス切換弁が配設される。また、このような構成に対応して、水道水供給手段の水道水供給流路の一部は主流路部と分岐流路部に分岐され、この水道水供給流路に上述したように水開閉弁及び切換開閉弁が配設される。そして、水開閉弁は元ガス開閉弁の開閉状態に対応して開閉制御され、切換開閉弁はガス切換弁の開閉状態に対応して開閉制御され、このようにすることによって、上述したと同様の作用効果が達成される。
【００４０】
また、上述した実施形態では、元ガス開閉弁３０並びに第１及び第２ガス切換弁３２，３４の開状態の一つ一つの信号に基づいて、それらに対応する水開閉弁６４並びに第１及び第２切換開閉弁６６，６８を開状態にしているが、このような構成に代えて、例えば、次ぎのように構成するようにしてもよい。制御手段を制御用マイコンから構成し、この制御用マイコンのメモリに図３に示す作動パターン（燃焼バーナ１２の燃焼状態と水開閉弁６４並びに第１及び第２切換開閉弁６６，６８の開閉状態との関係を示す作動パターン）を記憶し、元ガス開閉弁３０並びに第１及び第２ガス切換弁３２，３４の開状態の信号に基づいて、それらの開閉状態に対応する作動パターンを読み出し、読み出した作動パターンに基づいて水開閉弁６４並びに第１及び第２切換開閉弁６６，６８を開閉制御するようにしてもよい。
【００４１】
また、上述した実施形態では、第１及び第２ガス切換弁３２，３４の各々に対応するように第１及び第２切換開閉弁６６，６８を設けているが、このような構成に代えて、例えば第１及び第２ガス切換弁３２，３４に対応するように切換開閉弁を設けるようにしてもよい。この場合、水道水供給流路の一部を主流路部と分岐流路部とに分岐し、このような水道水供給流路に上述したと同様に水開閉弁及び切換開閉弁を設け、第１及び第２ガス切換弁６６，６８のいずれか一つ又は双方が開状態のときに切換開閉弁を開状態にして分岐流路部をも通して水道水を供給するようにすることができる。
【００４２】
第２の実施形態
次に、図５及び図６を参照して、第２の実施形態の燃焼装置について説明する。図５は、第２の実施形態の燃焼装置を簡略的に示す簡略図であり、図６は、図５の燃焼装置の制御の一部を示すフローチャートである。尚、以下の実施形態において、第１の実施形態と実質上同一の部材には同一の参照番号を付し、その説明を省略する。
【００４３】
図５において、第２の実施形態の燃焼装置２Ａは、給湯用温水を生成するための給湯用燃焼装置部１０２と、温水暖房装置に用いる温水を生成するための暖房用燃焼装置部１０４とから構成されている。給湯用燃焼装置部１０２の構成は、第１の実施形態の燃焼装置２と実質上同一の構成を有しており、それ故に、この給湯用燃焼装置部１０２の詳細な構成は省略する。
【００４４】
暖房用燃焼装置部１０４は、その基本的構成が給湯用燃焼装置部１０２と同一であり、燃焼バーナ１０６が第１及び第２バーナ部１０８，１１０から構成されている。また、燃焼室１１２の下端部には送風ファン１１４が設けられている。燃焼バーナ１０６には暖房用ガス供給流路１１６が接続され、このガス供給流路１１６の下流側部は主ガス供給流路部１１８と分岐ガス供給流路部１２０とに分岐され、主ガス供給流路部１２０が第１バーナ部１０８に接続され、分岐ガス供給流路部１２０が第２バーナ部１１０に接続されている。暖房用ガス供給流路１１６における主ガス供給流路部１１８及び分岐ガス供給流路部１２０よりも上流側には、上流側から暖房用元ガス開閉弁１２２及び暖房用比例弁１２４が順次設けられ、分岐ガス供給流路部１２０には暖房用ガス切換弁１２６が設けられている。
【００４５】
燃焼室１１２の下流側の排気流路１２８には、潜熱回収可能な暖房用熱交換器１３０が配設され、この暖房用熱交換器１３０は、給湯用燃焼装置部１０２の熱交換器３６と同様に、顕熱の回収を行う主熱交換器部１３２と、顕熱及び潜熱の回収を行う副熱交換器部１３４とから構成され、燃焼排気ガスの流れ方向に見て、上流側に主熱交換器部１３４が配設され、下流側に副熱交換器部１３６が配設されている。
【００４６】
暖房装置（例えば、床暖房装置、浴室暖房乾燥機、エアコン等）の温水循環流路１３８は、暖房装置に向けて温水を送給する往き流路部１４０と、暖房用熱交換器１３０に向けて温水を戻す戻し流路部１４２を有し、往き流路部１４０が熱交換器１３０の主熱交換器部１３２に接続され、戻り流路部１４２がその副熱交換器部１３４に接続されている。また、戻り流路部１４２には、温水を貯める貯湯タンク１４４と、温水を循環するための循環ポンプ１４６が配設されている。従って、温水循環流路１３８の戻り流路部１４２からの温水は、暖房用熱交換器１３０の副熱交換器部１３４において熱交換され、この副熱交換器部１３４にて燃焼排気ガス中の顕熱及び潜熱が回収され、次いでその主熱交換器部１３２において熱交換され、燃焼排気ガス中の顕熱が回収され、このように暖房用熱交換器１３０にて熱交換されて加熱された温水が往き流路部１４０を通して暖房装置に送給され、このようにして温水が温水循環流路１３８を通して循環される。
【００４７】
暖房用熱交換器１３０においても副熱交換器部１３４にて燃焼排気ガス中の潜熱を回収するので、この副熱交換器部１３４に結露が発生するようになり、このことに関連して、給湯用燃焼装置部１０４にもドレン排水手段１５２が設けられている。このドレン排水手段１５２は、暖房用燃焼装置部１０４のハウジング部１５４の所定部位（具体的には、副熱交換器部１３４の下方に位置する部位）に設けられたドレン受部１５４と、このドレン受部１５４から延びるドレン排水流路１５６を含み、ドレン排出流路１５６が給湯用燃焼装置部１０２のドレン排水流路５２に合流するように接続され、ドレン排水流路５２のこの合流部により下流側に混合槽５３が設けられている。従って、暖房用燃焼装置部１０４の副熱交換器部１３４にて結露した水は滴下してドレン受部１５４に集められ、このドレン受部１５４からドレン排水流路１５６を通り、更に給湯用燃焼装置部１０２のドレン排水流路５２を通して外部に排出される。
【００４８】
給湯用及び暖房用燃焼装置部１０２，１０４からのドレン水が排水されるドレン排水流路５２の混合槽５３には、ドレン水を中和処理するための水道水供給手段１５８が接続されている。この第２の実施形態における水道水供給手段１５８は、給湯用燃焼装置部１０２の給湯用熱交換器３６に水道水を送給する水道水送給流路４２とドレン排水流路５２とを接続する第１及び第２水道水供給流路１６０，１６２と、これら第１及び第２水道水供給流路１０６，１６２に配設された第１及び第２水開閉弁１６４，１６６から構成され、第１水開閉弁１６４が開状態になると、水道水送給流路４２からの水道水は、第１水道水供給流路１６０を通して混合槽５３に供給され、また第２水開閉弁１６６が開状態になると、水道水送給流路４２からの水道水は、第２水道水供給流路１６２を通して混合槽５３に送給される。
【００４９】
この第２の実施形態では、水道水供給手段１５８（第１及び第２水開閉弁１６４，１６６）は制御手段１６８によって制御され、この制御手段１６８は作動制御手段１７０及びタイマ１７２を含んでいる。作動制御手段１７０は、第１及び第２水開閉弁１６４，１６６を給湯用及び暖房用燃焼装置部１０２，１０４の作動状態、即ち給湯用元ガス開閉弁３０及び暖房用元ガス開閉弁１２２の開閉状態に対応して第１及び第２水開閉弁１６４，１６６を開閉制御する。この形態では、第１水開閉弁１６４が給湯用元ガス開閉弁３０に対応し、第２水開閉弁１６６が暖房用元ガス開閉弁１２２に対応しており、作動制御手段１７０は、給湯用元ガス開閉弁３０が開状態のときには給湯用元ガス開閉弁３０からの開状態の信号に基づいて第１水開閉弁１６４を開状態にし、暖房用元ガス開閉弁１２２が開状態のときには暖房用元ガス開閉弁１２２からの開状態の信号に基づいて第２水開閉弁１６６を開状態にする。
【００５０】
次に、図５とともに図６を参照して、上述した燃焼装置２Ａにおけるドレン水の中和処理について説明する。まず、ステップＳ−２１において、燃焼装置２Ａが作動したか否かが判断され、燃焼装置２Ａが非作動状態のときにはステップＳ−２２に進み、第１及び第２水開閉弁１６４，１６６が閉状態に保持される。このときには、給湯用及び暖房用燃焼装置部１０２，１０４の燃焼バーナ３６，１３０での燃焼はなく、それ故に、燃焼装置２Ａにおいてドレン水が発生せず、第１及び第２水開閉弁１６４，１６６は閉状態に保たれ、水道水供給手段１５８から水道水が供給されることはない。
【００５１】
燃焼装置２Ａが作動すると、ステップＳ−２１からステップＳ−２３に移り、まず、給湯用燃焼装置部１０２が作動状態か否か、換言すると給湯用元ガス開閉弁３０が開状態であるか否かが判断される。給湯用燃焼装置部１０２が非作動であるときには、給湯用元ガス開閉弁３０が閉に保持されており、この給湯用元ガス開閉弁３０の閉状態に対応して第１水開閉弁１６４が閉状態に保持される（ステップＳ−２４）。一方、給湯用燃焼装置部１０２が作動状態であると、給湯用元ガス開閉弁３０が開状態であり、この給湯用元ガス開閉弁３０の開状態に対応して第１水開閉弁１６４が開状態になる（ステップＳ−２５）。
【００５２】
次に、ステップＳ−２６に移り、暖房用燃焼装置部１０４が作動状態か否か、換言すると暖房用元ガス開閉弁１２２が開状態であるか否かが判断される。暖房用燃焼装置部１０４が非作動であるときには、暖房用元ガス開閉弁１２２が閉に保持されており、この暖房用元ガス開閉弁１２２の閉状態に対応して第２水開閉弁１６６が閉状態に保持される（ステップＳ−２７）。一方、暖房用燃焼装置部１０４が作動状態であると、暖房用元ガス開閉弁１２２が開状態であり、この暖房用元ガス開閉弁１２２の開状態に対応して第２水開閉弁１６６が開状態になる（ステップＳ−２８）。
【００５３】
このように、制御手段１６８は、給湯用及び暖房用燃焼装置部１０２，１０４の作動状態、換言すると給湯用及び暖房用元ガス開閉弁３０，１２２の開閉状態に対応して、水道水供給手段１５８の第１及び第２水開閉弁１６４，１６６を開閉制御するので、給湯用及び暖房用熱交換器３６，１３０の副熱交換器部４０，１３４で発生するドレン水を中和するのに適した量の水道水を水道水供給手段５４からドレン排水流路５２の混合槽５３に供給し、この混合槽５３にてドレン水を中和することができる。
【００５４】
次に、ステップＳ−２９に進み、給湯用及び暖房用元ガス開閉弁３０，１２２が閉状態であるか否かが判断され、燃焼装置２Ａの作動状態（給湯用及び暖房用燃焼装置部１０２，１０４のいずれか一方又は双方の作動状態）が継続し、給湯用及び暖房用元ガス開閉弁３０，１２２のいずれか一方又は双方が開状態に保持されているときにはステップＳ−２３に戻り、ステップＳ−２３からステップＳ−２９が繰り返し遂行される。これに対して、燃焼装置２Ａの作動が終了し、給湯用及び暖房用元ガス開閉弁３０，１２２の双方が閉状態になると、タイマ１７２が作動し（ステップＳ−３０）、このタイマ１７２がタイムアップする（ステップＳ−３１）と、第１水開閉弁１６４が閉状態になり（ステップＳ−３２）、また第２水開閉弁１６６が閉状態になる（ステップＳ−３３）。
【００５５】
上述した第２の実施形態では、給湯用燃焼装置部１０２及び暖房用燃焼装置部１０４の作動状態、換言すると給湯用及び暖房用元ガス開閉弁の開閉状態に対応して水道水供給手段１５８の第１及び第２水開閉弁１６４，１６６を開閉制御しているが、この第２の実施形態における給湯用燃焼装置部１０２及び／又は暖房用燃焼装置部１０４に第１の実施形態の技術的思想（燃焼バーナの燃焼状態に対応して水道水供給手段からの水道水の供給量を制御する）を組み合わせるようにしてもよい。
【００５６】
以上、本発明に従う燃焼装置の各種実施形態について説明したが、本発明はかかる実施形態に限定されるものではなく、本発明の範囲を逸脱することなく種々の変形乃至修正が可能である。
【００５７】
例えば、第１及び第２の実施形態では、いずれも、排気流路が横方向に延び、この排気流路の上流側部に熱交換器の主熱交換器部が配設され、その下流側部に副熱交換器部３６が配設された形態の燃焼装置に適用して説明したが、このような形態の燃焼装置に限定されず、例えば燃焼室から上方（又は下方）に排気流路が延び、この排気流路の上流側部に主熱交換器部が配設され、この主熱交換器部の上方（又は下方）である排気流路の下流側部に副熱交換器部が配設された形態のものにも同様に適用することができる。
【００５８】
また、例えば、上述した形態ではドレン排水流路５２に混合槽５３を設けてこの混合槽５３にてドレン水と水道水を混合しているが、ドレン水と水道水を所要の通り混合できる場合には、この混合槽５３を省略することもできる。
【００５９】
本発明の請求項１の燃焼装置によれば、燃焼バーナは複数個のバーナ部から構成され、燃焼バーナに燃料用ガスを供給するガス供給流路に元ガス開閉弁が配設され、ガス供給流路の下流側部の分岐供給流路部にガス切換弁が配設され、また水道水供給手段は主流路部と分岐流路部を有する水道水供給流路と、水開閉弁と、水切換開閉弁とを有し、制御手段は、元ガス開閉弁及びガス切換弁の開閉状態に基づいて、水開閉弁及び切換開閉弁を開閉制御するので、簡単な構成及び簡単な制御でもって水道水の供給量を所要の通りに制御することができ、水道水の無駄な使用を抑えることができる。
【００６１】
また、本発明の請求項２の燃焼装置によれば、ガス供給流路は複数の分岐供給流路部を有し、各分岐供給流路部にガス切換弁が配設され、また水道水供給流路には分岐供給流路部の数に対応する複数の分岐流路部が設けられ、各分岐流路部に水切換弁が配設され、制御手段は、ガス供給流路の複数の分岐供給流路部のガス切換弁の開閉状態に対応して、水道水供給流路の分岐流路部の水切換弁を開閉制御するので、簡単な制御でもって水道水の供給量を所要の通りに制御することができる。
【００６２】
また、本発明の請求項３の燃焼装置によれば、燃焼装置は暖房用燃焼装置部と給湯用燃焼装置部から構成され、暖房用燃焼装置部の燃焼バーナに燃料用ガスを供給する暖房用ガス供給流路には暖房用元ガス開閉弁が設けられ、給湯用燃焼装置部の燃焼バーナに燃料用ガスを供給する給湯用ガス供給流路には給湯用元ガス開閉弁が配設され、制御手段は暖房用元ガス開閉弁及び給湯用元ガス開閉弁の開閉状態に基づいて水道水供給手段からの水道水の供給量を制御するので、簡単な構成及び簡単な制御でもって、また燃焼装置部の作動状態に応じて、水道水の供給量を所要の通りに制御することができ、水道水の無駄な使用を抑えることができる。
【００６３】
また、本発明の請求項４の燃焼装置によれば、水道水供給手段は第１及び第２水道水供給流路を備え、第１及び第２水道水供給流路に第１及び第２水開閉弁が配設され、制御手段は暖房用元ガス開閉弁及び給湯用元ガス開閉弁の開閉状態に対応して第１及び第２水開閉弁を開閉制御するので、給湯用及び暖房用燃焼装置部の燃焼バーナにて発生したドレン水を中和するのに必要な量の水道水を簡単な制御でもって供給することができる。
【００６４】
更に、本発明の請求項５の燃焼装置によれば、水道水供給手段からの水道水の供給が燃焼バーナの燃焼終了後所定時間経過するまで行われるので、燃焼後ドレン排水流路を流れるドレン水をも中和することができる。
【図面の簡単な説明】
【図１】本発明に従う燃焼装置の第１の実施形態を簡略的に示す図である。
【図２】図１の燃焼装置における第１及び第２ガス切換弁の開閉状態と燃料用ガスの供給量との関係を示す図である。
【図３】図１の燃焼装置における第１及び第２ガス切換弁の開閉状態と水開閉弁並びに第１及び第２切換開閉弁の開閉状態との関係を示す図である。
【図４】図１の燃焼装置の制御の一部を示すフローチャートである。
【図５】本発明に従う燃焼装置の第２の実施形態を簡略的に示す図である。
【図６】図５の燃焼装置の制御の一部を示すフローチャートである。
【符号の説明】
２，２Ａ燃焼装置
６，１１２燃焼室
８，１２８排気流路
１２，１０６燃焼バーナ
３０，１２２元ガス開閉弁
３２，３４ガス切換弁
３６，１３０熱交換器
３８，１３２主熱交換器部
４０，１３４副熱交換器部
４８，１５２ドレン排水手段
５２，１５６ドレン排水流路
５４，１５８水道水供給手段
５６，１６０，１６２水道水供給流路
６４，１６４，１６６水開閉弁
６６，６８切換開閉弁
７０，１６８制御手段
１０２給湯用燃焼装置部
１０４暖房用燃焼装置部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a combustion apparatus including a heat exchanger capable of recovering latent heat.
[0002]
[Prior art]
A hot water supply combustion apparatus that supplies hot water includes a heat exchanger that exchanges heat with combustion exhaust gas generated by a combustion burner, and a tap water supply passage is connected to the inflow side of the heat exchanger. The hot water flow path is connected to the discharge side. In this heat exchanger, tap water is supplied to the heat exchanger through the tap water supply passage, and the warm water heated by heat exchange with the combustion exhaust gas in the heat exchanger is downstream through the outlet flow passage. To be sent to.
[0003]
In this type of hot water supply combustion apparatus, in order to increase the thermal efficiency, an apparatus equipped with a heat exchanger capable of recovering exhaust sensible heat and exhaust latent heat of combustion exhaust gas has been put into practical use. A heat exchanger capable of recovering latent heat usually includes a main heat exchanger section and a sub heat exchanger section, in which the sensible heat in the combustion exhaust gas is recovered and the sub heat exchanger. In the section, not only the sensible heat in the combustion exhaust gas but also the latent heat retained by the water vapor in the combustion exhaust gas is recovered.
[0004]
In this latent heat recovery type combustion apparatus, the latent heat of the water vapor in the combustion exhaust gas is taken away during the heat exchange in the sub heat exchanger, so that the water vapor is condensed and condensed in the sub heat exchanger. The generated condensed water (condensed water) is collected by the drainage means and discharged to the outside as drain water.
[0005]
This drain water absorbs nitrogen oxides and sulfur oxides in the combustion exhaust gas and becomes acidic water having a pH of about 3 to 4. Therefore, if it is discharged as it is, it will corrode the metal parts of the drain pipe and In order to lead to deterioration or the like, it is necessary to neutralize the pH value of the generated drain water within the range of 5 to 9 of the drainage standard.
[0006]
For this reason, conventionally, a drain drain passage for draining drain water is provided with a neutralizer filled with a solid alkaline neutralizer, and after neutralizing the drain water with this neutralizer Was draining. However, in the method using this neutralizer, clogging occurs when used for a long period of time, and the drainage capacity of drain water decreases, or the neutralizing performance decreases due to exhaustion of the neutralizing agent filled. there were.
[0007]
Therefore, in order to eliminate such inconveniences, there has been proposed one using tap water as a neutralizing agent (see, for example, Japanese Utility Model Publication No. 57-28239). In this combustion apparatus, a tap water supply channel for supplying tap water to a heat exchanger and a drain drain channel are connected via a tap water supply channel, and a running water regulating valve is connected to the tap water supply channel. Is arranged. When the running water control valve is opened, a part of the tap water flowing through the tap water supply channel is supplied to the drain drain channel through the tap water supply channel and mixed into the drain water, and the tap water is supplied depending on the opening degree. The supply amount of the tap water flowing through the flow path is adjusted, whereby the alkaline component contained in the tap water reacts with the acidic component of the drain water, and the drain water is diluted and neutralized with the tap water.
[0008]
[Problems to be solved by the invention]
Recently, the amount of drain water generated is calculated from the amount of combustion heat of the combustion burner, and the amount of tap water to be supplied by the tap water supply means from the calculated amount of drain water, in other words, the opening of the water flow adjustment valve. However, the control circuit configuration is complicated, and the control for controlling the opening of the running water control valve, that is, the supply amount of tap water, is complicated. As a result, there is a problem that the manufacturing cost becomes high.
[0009]
An object of the present invention is to provide a combustion apparatus capable of controlling the supply amount of tap water supplied from the tap water supply means to the drain drainage means with a simple configuration and control.
[0010]
  The present invention includes a combustion burner that generates combustion exhaust gas, a heat exchanger that performs heat exchange between the combustion exhaust gas and recovers sensible heat and latent heat, and drain water generated by heat exchange of the heat exchanger. Drain draining means for collecting and discharging water, tap water supply means for supplying tap water to the drain drain means, and control means for controlling the amount of tap water supplied from the tap water supply means; And a neutralization of drain water flowing through the drain discharge flow path by supplying tap water from the tap water supply means to the drain discharge flow path of the drain drainage means,
  The combustion burner includes a plurality of burner portions, and a downstream side portion of a gas supply passage for supplying fuel gas to the combustion burner is branched into a main supply passage portion and a branch supply passage portion, and the main supply portion The flow path part and the branch supply flow path part are respectively connected to the corresponding burner parts,
  An original gas on-off valve is disposed upstream of the main supply flow path and the branch supply flow path in the gas supply flow path, and a gas switching valve is disposed in the branch flow path. Has been
  The tap water supply means supplies tap water to the drain drain flow path of the drain drain means, a part of which is branched into a main flow path section and a branch flow path section, and the main flow path. A water on-off valve for supplying and stopping the supply of tap water through the section, and a switching on-off valve for supplying and stopping the supply of tap water through the branch flow path section,
  The control means controls the opening / closing of the water on / off valve and the switching on / off valve in accordance with the on / off state of the original gas on / off valve and the gas switching valve.It is a combustion apparatus characterized by these.
[0011]
  According to the present invention, a heat exchanger that recovers sensible heat and latent heat of the combustion exhaust gas is used as a heat exchanger, and the drain water generated in this heat exchanger is discharged through the drain drain passage of the drain drain means. In addition, tap water from the water supply means is supplied to the drain drain flow path, and the drain water is diluted and neutralized by the tap water from the tap water supply means. The combustion burner is composed of a plurality of burner portions, and an original gas on-off valve is provided in a gas supply passage (a portion upstream of the main supply passage portion and the branch supply passage portion) for supplying fuel gas to the combustion burner. A gas switching valve is provided in the branch supply channel on the downstream side of the gas supply channel.Arranged. Further, the tap water supply means has a tap water supply channel having a main channel part and a branch channel part, a water on / off valve, and a water switching on / off valve. Tap water is supplied to the drainage drainage means through the section, and when the switching on / off valve is opened, tap water is also supplied to the drainage drainage means from the branch channel section.. Thus, based on the open / close state of the original gas on-off valve and the gas switching valveBecause it controls the water on-off valve and switching on-off valve,With a simple configuration and simple control, the supply amount of tap water can be controlled as required, and wasteful use of tap water can be suppressed.
[0012]
  For example, when the original gas on-off valve is in the open state and the gas switching valve is in the closed state, the combustion burner is in the small combustion state, and the control meansIn order to reduce the amount of tap water supplied, only the water on / off valve is opened in response to this state, whereby a relatively small amount of tap water is supplied through the main flow path section.When the original gas on-off valve and the gas switching valve are open, the combustion burner is in a large combustion state, and the control meansIn order to increase the amount of tap water supplied, the water on / off valve and the switching on / off valve are opened in response to this state, whereby a relatively large amount of tap water is supplied through the main channel portion and the branch channel portion. With this simple control, the supply of tap water can be controlled as required.
  When two or more branch supply channel portions of the gas supply channel are provided, also in the tap water supply channel, a branch channel portion is provided corresponding to each branch supply channel. In order to simplify the supply control of tap water, it is possible to arrange a switching on-off valve, and based on the opening and closing of the gas switching valve of two or more branch supply channel sections, one branch channel The switching valve of the part may be opened and closed.
[0015]
Further, in the present invention, a plurality of branch supply flow path portions are provided on the downstream side of the gas supply flow path, and the gas switching valves are respectively disposed in the plurality of branch supply flow path portions. The part of the tap water supply flow path is provided with a plurality of branch flow path parts corresponding to the number of the branch supply flow path parts of the gas supply flow path, A switching on / off valve is provided, and the control means corresponds to the open / close state of the gas switching valve of the plurality of branch supply flow path portions of the gas supply flow path, and the plurality of tap water supply flow paths The switching on / off valve of the branch flow path part is controlled to open / close.
[0016]
According to the present invention, the gas supply passage has a plurality of branch supply passage portions, and a gas switching valve is provided in each branch supply passage portion. Corresponding to such a configuration of the gas supply flow path, the tap water supply flow path is provided with a plurality of branch flow path portions corresponding to the number of branch supply flow path portions, and is switched to each branch flow path portion. An on-off valve is provided. The control means controls opening / closing of the switching on / off valve of the branch channel portion of the tap water supply channel in response to the opening / closing state of the gas switching valve of the plurality of branch supply channel units of the gas supply channel. When the gas switching valve of a specific branch supply channel is open, tap water is supplied with the switching on / off valve of the branch channel of the tap water supply means corresponding to this open. Thus, the supply amount of tap water can be controlled as required.
[0017]
Moreover, in this invention, it is comprised from the combustion apparatus part for heating for supplying warm water to a heating apparatus, and the combustion apparatus part for hot water supply for supplying hot water, The combustion apparatus part for heating and the combustion apparatus for hot water supply Each includes a combustion burner that generates combustion exhaust gas, a heat exchanger that performs heat exchange between the combustion exhaust gas and recovers sensible heat and latent heat, and a drain generated by heat exchange of the heat exchanger. A drain draining means for collecting and discharging water, and the drain draining means of the combustion device part for the heating device and the drain draining means of the combustion device part for the hot water supply device join and drain the drain water. Further, the combustion apparatus is further provided with tap water supply means for supplying tap water used for diluting and neutralizing drain water and control means for controlling the tap water supply means. And
A heating gas supply flow path for supplying fuel gas is connected to the combustion burner of the heating combustion device section, and a heating source gas on / off valve is disposed in the heating gas supply flow path,
A hot water supply gas supply flow path for supplying fuel gas is connected to the combustion burner of the hot water supply combustion device section, and a hot water supply source gas on / off valve is disposed in the hot water supply gas supply flow path,
The combustor characterized in that the control means controls the amount of tap water supplied from the tap water supply means based on the open / closed state of the heating source gas on / off valve and the hot water supply source gas on / off valve. It is.
[0018]
According to the present invention, the combustion apparatus is composed of a heating combustion apparatus section and a hot water supply combustion apparatus section, the drain drain means of these combustion apparatus sections are connected to each other, and the tap water from the tap water supply means is drain drain means. It is comprised so that it may be supplied to. The heating gas supply flow path for supplying fuel gas to the combustion burner of the heating combustion device section is provided with a heating source gas on-off valve, for supplying hot gas to the combustion burner of the hot water combustion device section The gas supply passage is provided with a hot water source gas on / off valve, and the control means supplies the tap water from the tap water supply means based on the open / close state of the heating source gas on / off valve and the hot water source gas on / off valve. To control. Since the supply amount of tap water is controlled based on the operation and non-operation of the combustion unit for heating and the combustion unit for hot water supply in this way, the supply amount of tap water can be set as required with a simple configuration and simple control. It is possible to control the wasteful use of tap water.
[0019]
For example, when the hot water source gas on-off valve is in the open state (when the hot water combustion unit is in operation), condensation tends to occur in the heat exchanger, and the amount of drain water is increased. The control means controls the tap water supply means so that the supply amount of tap water increases, and when the heating source gas on / off valve is open (when the heating combustion unit is in operation), the control means The dew condensation generated in the exchanger is small and the amount of drain water drained is small, so the control means controls the tap water supply means so that the supply amount of tap water is small.
[0020]
In the present invention, the tap water supply means includes first and second tap water supply passages for supplying tap water, and first and second tap water supply passages disposed in the first and second tap water supply passages. A two-water on-off valve, and the control means controls the opening and closing of the first and second water on-off valves in response to the on / off state of the heating source gas on-off valve and the hot water supply source gas on-off valve. It is characterized by.
[0021]
According to the present invention, the tap water supply means includes the first and second tap water supply passages, and the first and second water on / off valves are disposed in the first and second tap water supply passages. The control means controls the opening and closing of the first and second water on / off valves in accordance with the open / closed states of the heating source gas on / off valve and the hot water supply source gas on / off valve. The first water on / off valve (or the second water on / off valve) is opened when the gas on / off valve is open, and the first water on / off valve for heating and the hot water source gas on / off valve are in the open state. And since the 2nd water on-off valve is made into an open state, the quantity of tap water required in order to neutralize generated drain water can be supplied by simple control.
[0022]
Furthermore, in the present invention, the tap water supply means stops supplying tap water after a predetermined time has elapsed after the combustion of the combustion burner.
According to the present invention, the supply of tap water from the tap water supply means is stopped after a predetermined time has elapsed after the combustion of the combustion burner. Since drainage of drain water through the drain drain passage is performed until a little time has passed after the combustion of the combustion burner, drain water can be neutralized as required by controlling in this way. The predetermined time is set to about 1 to 3 minutes.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a combustion apparatus according to the present invention will be described with reference to the accompanying drawings.
First embodiment
First, with reference to FIGS. 1-4, 1st Embodiment of the combustion apparatus according to this invention is described. FIG. 1 is a simplified diagram schematically showing the combustion apparatus of the first embodiment, and FIG. 2 is a diagram showing the open / closed states of the first and second gas switching valves and the supply amount of fuel gas in the combustion apparatus of FIG. 3 is a diagram showing the relationship between the open / closed state of the first and second gas switching valves and the open / closed state of the water on / off valve and the first and second switching on / off valves in the combustion apparatus of FIG. FIG. 4 is a flowchart showing a part of the control of the combustion apparatus of FIG.
[0024]
In FIG. 1, the illustrated hot water supply combustion apparatus 2 includes an apparatus housing 4, and a combustion chamber 6 is defined in the combustion housing 4. An exhaust passage 8 extending laterally in FIG. 1 is formed above the combustion chamber 6, and an exhaust port 10 is provided at the downstream end of the exhaust passage 8. A combustion burner 12 is disposed in the lower part of the combustion chamber 6, and in the illustrated form, the combustion burner 12 is composed of first to third burner portions 14, 16, 18. A blower fan 20 is provided at the lower end of the combustion chamber 6, and the blower fan 20 supplies combustion air to the combustion chamber 6.
[0025]
Fuel gas (for example, city gas, LP gas) is supplied to the combustion burner 12 through the gas supply passage 22. A downstream side portion of the gas supply flow path 22 is branched into a main supply flow path section 24 and first and second branch gas supply flow path sections 26 and 28, and the main gas supply flow path section 24 is connected to the first burner section 14. Then, the first branch supply flow path portion 26 is connected to the second burner portion 16, and the second branch supply flow passage portion 28 is connected to the third burner portion 18. An upstream side of the main supply flow path portion 24 and the first and second branch supply flow path portions 26 and 28 in the gas supply flow path 22 are sequentially provided with an original gas on-off valve 30 and a proportional valve 31 from the upstream side. The first branch supply flow path section 26 is provided with a first gas switching valve 32, and the second branch supply flow path section 28 is provided with a second gas switching valve 34. The original gas on-off valve 30 opens and closes the gas supply passage 22 to supply and stop the supply of fuel gas, the proportional valve 31 controls the supply amount of the fuel gas flowing through the gas supply passage 22, and the first The gas switching valve 32 opens and closes the first branch supply flow path section 26 to supply and stop the supply of fuel gas to the second burner section 16, and the second gas switch valve 34 is connected to the second branch supply flow path section 28. Is opened and closed to supply fuel gas to the third burner 18 and stop supplying it.
[0026]
Since it is comprised in this way, as shown in FIG. 2 (a) and (b), the combustion state of the combustion burner 12 is controlled by four steps, ie, AD area | region. In the region A where only the original gas on-off valve 30 is open, the fuel gas is supplied to the first burner portion 14 through the main supply flow path portion 24, and the combustion burner 12 burns only in the first burner portion 14. It becomes a small combustion state. In the B region where the original gas on-off valve 30 and the first gas switching valve 32 are opened, the fuel gas passes through the main supply flow path section 12 and the first branch supply flow path section 26, and the first and second burner sections 14, 16, the combustion burner 12 is in a small combustion state in which combustion is performed in the first and second burner portions 14 and 16. In the region C in which the original gas on-off valve 30 and the second gas switching valve 34 are opened, the fuel gas passes through the main supply flow path section 12 and the second branch supply flow path section 28, and the first and third burner sections 14, 18, the combustion burner 12 is in a large combustion state during combustion in the first and third burner portions 14, 18. Further, in the D region where the original gas on / off valve 30 and the first and second gas switching valves 32 and 34 are opened, the fuel gas is supplied to the main supply flow path portion 24 and the first and second branch supply flow path portions 26. , 28 to the first to third burner parts 14, 16, 18 and the combustion burner 12 is in a large combustion state in which it burns in the first to third burner parts 14, 16, 18. The combustion exhaust gas generated by the combustion of the combustion burner 12 flows through the combustion chamber 6 and the exhaust passage 8 and is discharged to the outside from the exhaust port 10.
[0027]
A heat exchanger 36 that recovers sensible heat and latent heat in the combustion exhaust gas is disposed in the exhaust flow path 8 on the downstream side of the combustion chamber 6. The heat exchanger 36 includes a main heat exchanger section 38 and a sub heat exchanger section 40. The main heat exchanger section 38 is disposed on the upstream side and the sub heat exchanger section 40 is disposed on the downstream side when viewed in the flow direction of the combustion exhaust gas. A heat exchanger section 40 is provided.
[0028]
This combustion apparatus 2 is used as an apparatus for supplying hot water to a curan (not shown) provided in a kitchen sink, washstand, etc., and from a tap water supply source (not shown) such as a tap water buried pipe. A tap water supply passage 42 for supplying tap water is connected to the auxiliary heat exchanger section 40 of the heat exchanger 36, and a hot water passage 44 connected to the currant is connected to the main heat exchanger section 38, A tap water opening / closing valve 46 is disposed in the tap water supply passage 42.
[0029]
Since it is configured in this way, when the currant (not shown) is opened, the tap water opening / closing valve 46 of the tap water supply passage 42 is opened, and tap water from the tap water supply passage 42 is opened. Is first supplied to the sub heat exchanger section 40 of the heat exchanger 32, where heat is exchanged with the combustion exhaust gas in the sub heat exchanger section 40, and the sensible heat and latent heat in the combustion exhaust gas are changed. Recovery is performed. The hot water heat-exchanged in the auxiliary heat exchanger section 40 is then supplied to the main heat exchanger section 38, where heat is exchanged with the combustion exhaust gas in the main heat exchanger section 38. The recovery of sensible heat in the combustion exhaust gas is performed. The hot water heated by the heat exchanger 36 in this way is supplied to the currant (not shown) through the hot water flow path 44 and is discharged from the opened currant.
[0030]
In the combustion apparatus 2 described above, since the latent heat in the combustion exhaust gas is also recovered by the auxiliary heat exchanger section 40 of the heat exchanger 36, dew condensation occurs in the auxiliary heat exchanger section 40. In connection with this, the drain drain means 48 is provided so that the water condensed in the sub heat exchanger part 40 may be drained outside as drain water. The drain drain means 48 shown in the figure extends from a drain receiving portion 50 provided at a predetermined portion of the apparatus housing 4 (specifically, a portion located below the auxiliary heat exchanger portion 40), and the drain receiving portion 50. The drain drainage channel 52 is included, and the water condensed in the auxiliary heat exchanger 40 is dropped and collected in the drain receiving unit 50, and is drained from the drain receiving unit 50 to the outside through the drain draining channel 52.
[0031]
The drain drainage channel 52 is provided with a mixing tank 53, and tap water supply means 54 for supplying tap water used for diluting and neutralizing the drain water is connected to the mixing tank 53. The tap water supply means 54 includes a tap water supply channel 56 for supplying tap water, and one end of the tap water supply channel 56 is connected to the tap water supply channel 42 (specifically, from the tap water opening / closing valve 46). The other end side is connected to the mixing tank 53 of the drain drainage channel 52.
[0032]
In this embodiment, the downstream side portion of the tap water supply flow channel 56 is branched into the main flow channel portion 58 and the first and second branch flow channel portions 60 and 62, and the branch supply flow channel portions 26 and 28 of the gas supply flow channel 20. The branch flow channel portions 60 and 62 of the tap water supply flow channel 56 are provided corresponding to the number of branches, and the main flow channel portion 58 and the first and second branch flow channel portions 60 and 62 are connected to the mixing tank 53. ing. A water on / off valve 64 is disposed in the tap water supply flow path 56 (specifically, upstream of the branch flow path sections 60 and 62), and the first and second branch flow path sections 60 and 62 have first First and second switching on / off valves 66 and 68 are provided.
[0033]
With this configuration, when the water opening / closing valve 64 is opened, a small amount of tap water from the tap water supply passage 42 is supplied to the mixing tank 53 through the main passage portion 58 of the tap water supply passage 56. The When the water on / off valve 64 and the first switching on / off valve 66 (or the second switching on / off valve 68) are opened, the main channel 58 and the first branch channel 60 (or the second branch) of the tap water supply channel 56 are provided. A medium amount of tap water is supplied to the mixing tank 53 through the flow path 62). In this embodiment, the supply amount flowing through the second branch flow passage portion 62 is set to be larger than the supply amount flowing through the first branch flow passage portion 60, and accordingly, the water on / off valve 64 and the second switching on / off valve are set. The supply amount of tap water increases when 66 is in the open state. In addition, when the water on / off valve 64 and the first and second switching on / off valves 66 and 68 are in the open state, the tap water is supplied through the main channel portion 58 of the tap water supply channel 56 and the first and second branch channel portions 60 and 62. A large amount of water is supplied to the mixing tank 53.
[0034]
In this embodiment, the downstream side portion of the tap water supply flow channel 56 is branched and then connected to the drain drain flow channel 52. And the tap water supply flow path after the merge may be connected to the mixing tank 53 of the drain drainage flow path 52, to a portion upstream of the mixing tank 53, or to the drain receiving portion 50. In this embodiment, a water on / off valve 64 is provided in the middle of the tap water supply flow path 56, and first and second switching on / off valves 66 and 68 are provided in the first and second branch flow path sections 60 and 62. However, instead of such a configuration, a water on / off valve 64 is provided in the main flow path portion 58 of the tap water supply flow path 56, and the first and second branch flow path portions 60 and 62 are switched to the first and second switching paths. The on-off valves 66 and 68 may be provided, and even with this configuration, tap water can be supplied in the same manner as described above.
[0035]
In this embodiment, the tap water supply means 54 (the water on / off valve 64 and the first and second switching on / off valves 66 and 68) is controlled by the control means 70, and the control means 70 includes an operation control means 72 and a timer 74. It is out. The operation control means 72 switches the water on / off valve 64 and the first and second switching on / off valves 66 and 68 to the combustion state of the combustion burner 12, that is, the opening and closing of the original gas on / off valve 30 and the first and second gas switching valves 32 and 34. The water on / off valve 64 and the first and second switching on / off valves 66 and 68 are controlled to open / close in accordance with the state. In this embodiment, the water on / off valve 64 corresponds to the original gas on / off valve 30, the first gas switching valve 32 corresponds to the first switching on / off valve 66, and the second gas switching valve 34 to the second switching on / off valve 68. Correspondingly, the operation control means 72 opens the switching on / off valve 64 on the basis of the open state signal from the original gas on / off valve 30 when the original gas on / off valve 30 is in the open state, and the first gas switching valve 32. Is open, the first switching on / off valve 66 is opened based on an open signal from the first gas switching valve 32, and from the second gas switching valve 34 when the second gas switching valve 34 is open. Based on the open state signal, the second switching on / off valve 68 is opened. Therefore, as shown in FIG. 3, the operation control means 72 opens the water on-off valve 64 in the region A where the original gas on-off valve 30 is open, and the original gas on-off valve 30 and the first gas switching valve are opened. The water on / off valve 64 and the first switching on / off valve 66 are opened in the region B in which the valve 32 is open, and the water on / off valve in the region C in which the original gas on / off valve 30 and the second gas on / off valve 34 are open. 64 and the second switching on / off valve 68 are opened, and in the region D where the original gas on / off valve 30 and the first and second gas switching valves 66 and 68 are open, the water on / off valve 64 and the first and second switching valves 68 and 68 are opened. The switching on / off valves 66 and 68 are opened. The timer 74 measures the set time.
[0036]
Next, with reference to FIG. 4 together with FIG. 1, the drain water neutralization process in the combustion apparatus 2 described above will be described. When the combustion device 2 is inactive, the original gas on-off valve 30 is maintained closed (off). At this time, no combustion occurs in the combustion burner 12, no condensation occurs in the auxiliary heat exchanger section 40 of the heat exchanger 36, and the water on-off valve 64 is kept closed (step S-2). Therefore, the tap water supply means 54 is kept in the non-operating state, and tap water is not supplied to the drain drainage channel 52 through the tap water supply channel 54.
[0037]
When the combustion apparatus 2 is operated from such a state, the process proceeds from step S-1 to step S-3, and the original gas switching valve 30 is corresponding to the fact that the original gas switching valve 30 is open (on). Based on the signal from the control means 70, the water on / off valve 64 is opened. Next, it progresses to step S-4, it is judged whether the 1st gas switching valve 32 is an open state, and if the 1st gas switching valve 32 is a closed state, the 1st switching on-off valve 66 will also be a closed state. However, if the first gas switching valve 32 is open, the control means 70 opens the first switching on-off valve 66 based on a signal from the first gas switching valve 32. The state is set (step S-6). Next, the process proceeds to step S-7, where it is determined whether or not the second gas switching valve 34 is open. If the second gas switching valve 34 is closed, the second switching on / off valve 68 is also closed. Although maintained (step S-8), if the second gas switching valve 34 is open, the control means 70 opens the second switching on-off valve 68 based on the signal from the second gas switching valve 34. (Step S-9). Thus, the control means 70 corresponds to the combustion state of the combustion burner 12, in other words, the open / close state of the main gas on / off valve 30 and the on / off states of the first and second gas switching valves 32, 34. Since the second switching on / off valves 66 and 68 are controlled to open and close as shown in FIG. 3, an amount of tap water suitable for neutralizing drain water generated in the auxiliary heat exchanger section 40 of the heat exchanger 36 is obtained. It is supplied from the tap water supply means 54 to the mixing tank 53. In the mixing tank 53, the drain water from the drain drainage channel 52 and the tap water from the tap water supply means 54 are mixed, and the drain water is diluted and neutralized by the tap water.
[0038]
Next, it progresses to step S-10, it is judged whether the original gas on-off valve 30 is an open state, the operating state of the combustion apparatus 2 continues, and the original gas on-off valve 10 is hold | maintained at the open state. Sometimes, the process returns to Step S-3, and Steps S-3 to S-10 are repeatedly performed. On the other hand, when the operation of the combustion device 2 is finished and the original gas on-off valve 10 is closed, the timer 74 is activated (step S-11), and the timer 74 is set for a predetermined time (for example, 1 to 3 minutes). The state is kept until it is timed). When the timer 74 expires (step S-12), the process proceeds to step S-13, the water on / off valve 64 is closed, and the first and second switching on / off valves 66 and 68 are closed ( Step S-14), the supply of tap water by the tap water supply means 54 is completed. As described above, since the tap water is continuously supplied for a predetermined time after the combustion of the combustion burner 12 (period in which the timer 74 times up), the tap water supply means 54 supplies the tap water until the drain water is completely drained. The drain water generated is reliably diluted and neutralized.
[0039]
In this embodiment, the combustion burner 12 is composed of three burner portions 14, 16, and 18. However, the combustion burner 12 may be composed of two or four or more burner portions. For example, when the combustion burner 12 is composed of two burner parts, the main supply flow path part of the gas supply flow path is connected to one burner part, and the branch supply flow path part is connected to the other burner part. In the same manner as described above, the original gas on-off valve and the gas switching valve are arranged in the gas supply channel. Corresponding to such a configuration, a part of the tap water supply channel of the tap water supply means is branched into a main channel and a branch channel, and the tap water supply channel is opened and closed as described above. A valve and a switching on-off valve are provided. The water on / off valve is controlled to open / close in accordance with the open / close state of the original gas on / off valve, and the switching on / off valve is controlled to open / close in accordance with the open / closed state of the gas switch valve. The effect of is achieved.
[0040]
Moreover, in embodiment mentioned above, based on each signal of the open state of the original gas on-off valve 30, and the 1st and 2nd gas switching valve 32,34, the water on-off valve 64 corresponding to them, and 1st and 2nd Although the second switching on / off valves 66 and 68 are in the open state, instead of such a configuration, for example, the following configuration may be used. The control means comprises a control microcomputer, and the operation pattern shown in FIG. 3 (combustion state of combustion burner 12, water on / off valve 64 and on / off states of first and second switching on / off valves 66 and 68) is stored in the memory of the control microcomputer. And the operation pattern corresponding to the open / close state is read based on the open state signals of the original gas on / off valve 30 and the first and second gas switching valves 32, 34, The water on / off valve 64 and the first and second switching on / off valves 66 and 68 may be controlled to open / close based on the read operation pattern.
[0041]
In the above-described embodiment, the first and second switching on / off valves 66 and 68 are provided so as to correspond to the first and second gas switching valves 32 and 34, respectively. For example, a switching on / off valve may be provided so as to correspond to the first and second gas switching valves 32 and 34. In this case, a part of the tap water supply channel is branched into a main channel portion and a branch channel portion, and the tap water supply channel is provided with a water on / off valve and a switching on / off valve in the same manner as described above. When either one or both of the first and second gas switching valves 66 and 68 are open, the switching on-off valve is opened and the tap water can be supplied through the branch channel section. .
[0042]
Second embodiment
Next, with reference to FIG.5 and FIG.6, the combustion apparatus of 2nd Embodiment is demonstrated. FIG. 5 is a simplified diagram schematically showing the combustion apparatus of the second embodiment, and FIG. 6 is a flowchart showing a part of control of the combustion apparatus of FIG. In the following embodiments, substantially the same members as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
[0043]
In FIG. 5, the combustion apparatus 2A of the second embodiment includes a hot water supply combustion apparatus section 102 for generating hot water supply hot water and a heating combustion apparatus section 104 for generating hot water used in the hot water heating apparatus. It is configured. The configuration of the hot water supply combustion device section 102 is substantially the same as that of the combustion device 2 of the first embodiment, and therefore, the detailed configuration of the hot water supply combustion device section 102 is omitted.
[0044]
The basic configuration of the heating combustor unit 104 is the same as that of the hot water supply combustor unit 102, and the combustion burner 106 includes first and second burner units 108 and 110. A blower fan 114 is provided at the lower end of the combustion chamber 112. A gas supply passage 116 for heating is connected to the combustion burner 106, and a downstream side portion of the gas supply passage 116 is branched into a main gas supply passage portion 118 and a branch gas supply passage portion 120. The flow path part 120 is connected to the first burner part 108, and the branch gas supply flow path part 120 is connected to the second burner part 110. On the upstream side of the main gas supply flow path 118 and the branch gas supply flow path 120 in the heating gas supply flow path 116, a heating source gas on-off valve 122 and a heating proportional valve 124 are sequentially provided from the upstream side. The branch gas supply flow path 120 is provided with a heating gas switching valve 126.
[0045]
A heating heat exchanger 130 capable of recovering latent heat is disposed in the exhaust passage 128 on the downstream side of the combustion chamber 112, and the heating heat exchanger 130 is connected to the heat exchanger 36 of the hot water supply combustion unit 102. Similarly, it is composed of a main heat exchanger section 132 that collects sensible heat and a sub heat exchanger section 134 that collects sensible heat and latent heat. A heat exchanger section 134 is disposed, and a sub heat exchanger section 136 is disposed on the downstream side.
[0046]
A warm water circulation channel 138 of a heating device (for example, a floor heating device, a bathroom heater / dryer, an air conditioner, etc.) is directed to an outgoing channel unit 140 that feeds warm water toward the heating device and to a heat exchanger 130 for heating. The return flow path portion 142 for returning the hot water, the forward flow path portion 140 is connected to the main heat exchanger portion 132 of the heat exchanger 130, and the return flow path portion 142 is connected to the sub heat exchanger portion 134. ing. The return channel 142 is provided with a hot water storage tank 144 for storing hot water and a circulation pump 146 for circulating the hot water. Accordingly, the hot water from the return flow path portion 142 of the hot water circulation flow path 138 is heat-exchanged in the auxiliary heat exchanger section 134 of the heating heat exchanger 130, and the auxiliary heat exchanger section 134 in the combustion exhaust gas Sensible heat and latent heat are recovered, and then heat exchange is performed in the main heat exchanger section 132, and sensible heat in the combustion exhaust gas is recovered, and thus heat exchange is performed in the heating heat exchanger 130 and heated. Hot water is supplied to the heating device through the forward flow path portion 140, and thus the hot water is circulated through the hot water circulation flow path 138.
[0047]
Also in the heat exchanger 130 for heating, the sub heat exchanger section 134 recovers the latent heat in the combustion exhaust gas, so that dew condensation occurs in the sub heat exchanger section 134. The drainage means 152 is also provided in the hot water supply combustion unit 104. The drain drainage means 152 includes a drain receiving portion 154 provided at a predetermined portion of the housing portion 154 of the heating combustion device portion 104 (specifically, a portion located below the auxiliary heat exchanger portion 134), A drain drain passage 156 extending from the drain receiving portion 154 is connected, and the drain discharge passage 156 is connected so as to merge with the drain drain passage 52 of the hot water supply combustion device section 102. A mixing tank 53 is provided on the downstream side. Accordingly, the water condensed in the auxiliary heat exchanger section 134 of the heating combustion apparatus section 104 is dropped and collected in the drain receiving section 154, and from this drain receiving section 154 through the drain drainage flow path 156, further combustion for hot water supply It is discharged to the outside through the drain drainage channel 52 of the device unit 102.
[0048]
A tap water supply means 158 for neutralizing the drain water is connected to the mixing tank 53 of the drain drainage channel 52 from which drain water from the hot water supply and heating combustor units 102 and 104 is drained. . The tap water supply means 158 in the second embodiment connects the tap water supply passage 42 for supplying tap water to the hot water supply heat exchanger 36 of the hot water supply combustion apparatus section 102 and the drain drain passage 52. The first and second tap water supply channels 160 and 162, and the first and second water on / off valves 164 and 166 disposed in the first and second tap water supply channels 106 and 162, When the first water on / off valve 164 is opened, tap water from the tap water supply passage 42 is supplied to the mixing tank 53 through the first tap water supply passage 160 and the second water on / off valve 166 is opened. When the state is reached, the tap water from the tap water supply channel 42 is supplied to the mixing tank 53 through the second tap water supply channel 162.
[0049]
In the second embodiment, the tap water supply means 158 (first and second water on / off valves 164 and 166) is controlled by the control means 168, and the control means 168 includes an operation control means 170 and a timer 172. . The operation control means 170 operates the first and second water on / off valves 164 and 166 in the operating states of the hot water supply and heating combustion devices 102 and 104, that is, the hot water supply source gas on / off valve 30 and the heating source gas on / off valve 122. The first and second water on / off valves 164 and 166 are controlled to open / close in accordance with the open / close state. In this embodiment, the first water on / off valve 164 corresponds to the hot water source gas on / off valve 30, the second water on / off valve 166 corresponds to the heating source gas on / off valve 122, and the operation control means 170 is used for hot water supply. When the main gas on / off valve 30 is open, the first water on / off valve 164 is opened based on the open state signal from the hot water supply main gas on / off valve 30, and when the heating main gas on / off valve 122 is open, heating is performed. Based on the open state signal from the source gas on / off valve 122, the second water on / off valve 166 is opened.
[0050]
Next, with reference to FIG. 6 together with FIG. 5, the drain water neutralization process in the combustion apparatus 2A described above will be described. First, in step S-21, it is determined whether or not the combustion apparatus 2A has been operated. When the combustion apparatus 2A is in an inoperative state, the process proceeds to step S-22, and the first and second water on-off valves 164 and 166 are closed. Kept in a state. At this time, there is no combustion in the combustion burners 36, 130 of the hot water supply and heating combustion device sections 102, 104. Therefore, no drain water is generated in the combustion device 2A, and the first and second water on / off valves 164 166 is kept closed, and no tap water is supplied from the tap water supply means 158.
[0051]
When the combustion device 2A is operated, the process proceeds from step S-21 to step S-23, and first, whether or not the hot water supply combustion device 102 is in an operating state, in other words, whether or not the hot water supply source gas on-off valve 30 is in an open state. Is judged. When the hot water supply combustion unit 102 is inactive, the hot water supply source gas on / off valve 30 is held closed, and the first water on / off valve 164 corresponds to the closed state of the hot water supply source gas on / off valve 30. The closed state is maintained (step S-24). On the other hand, when the hot water supply combustor unit 102 is in an operating state, the hot water supply source gas on / off valve 30 is open, and the first water on / off valve 164 corresponds to the open state of the hot water supply source gas on / off valve 30. It will be in an open state (step S-25).
[0052]
Next, the process proceeds to step S-26, where it is determined whether or not the heating combustor unit 104 is in an operating state, in other words, whether or not the heating source gas on-off valve 122 is in an open state. When the heating combustor unit 104 is inactive, the heating source gas on / off valve 122 is held closed, and the second water on / off valve 166 corresponds to the closed state of the heating source gas on / off valve 122. The closed state is maintained (step S-27). On the other hand, when the heating combustor unit 104 is in an operating state, the heating source gas on / off valve 122 is in an open state, and the second water on / off valve 166 is set in correspondence with the open state of the heating source gas on / off valve 122. It will be in an open state (step S-28).
[0053]
Thus, the control means 168 corresponds to the operating state of the hot water supply and heating combustor units 102, 104, in other words, the open / close state of the hot water supply and heating source gas on / off valves 30, 122, and tap water supply means. Since the first and second water on / off valves 164 and 166 of the 158 are controlled to open and close, the drain water generated in the auxiliary heat exchanger sections 40 and 134 of the hot water supply and heating heat exchangers 36 and 130 is neutralized. A suitable amount of tap water can be supplied from the tap water supply means 54 to the mixing tank 53 of the drain drainage channel 52, and the drain water can be neutralized in the mixing tank 53.
[0054]
Next, the process proceeds to step S-29, where it is determined whether or not the hot water supply and heating source gas on / off valves 30, 122 are in the closed state, and the combustion device 2A is activated (the hot water supply and heating combustion device section 102). , 104 or the operation state of either one or both) continues, and when one or both of the hot water supply and heating source gas on / off valves 30, 122 are held open, the process returns to step S-23, Steps S-23 to S-29 are repeatedly performed. In contrast, when the operation of the combustion device 2A is finished and both the hot water supply and heating source gas on / off valves 30, 122 are closed, the timer 172 is activated (step S-30), and the timer 172 is activated. When the time is up (step S-31), the first water on-off valve 164 is closed (step S-32), and the second water on-off valve 166 is closed (step S-33).
[0055]
In the above-described second embodiment, the tap water supply means 158 corresponds to the operating state of the hot water supply combustion unit 102 and the heating combustion unit 104, in other words, the open / close state of the hot water supply and heating source gas on / off valves. The first and second water on / off valves 164 and 166 are controlled to open and close. The hot water supply combustion device 102 and / or the heating combustion device 104 according to the second embodiment has the technical features of the first embodiment. You may make it combine a thought (control the supply amount of the tap water from a tap water supply means according to the combustion state of a combustion burner).
[0056]
As mentioned above, although various embodiment of the combustion apparatus according to this invention was described, this invention is not limited to this embodiment, A various deformation | transformation thru | or correction | amendment are possible without deviating from the scope of the present invention.
[0057]
For example, in both the first and second embodiments, the exhaust passage extends in the lateral direction, and the main heat exchanger portion of the heat exchanger is disposed on the upstream side portion of the exhaust passage, and the downstream side thereof. However, the present invention is not limited to such a combustion apparatus. For example, the exhaust flow path is upward (or downward) from the combustion chamber. The main heat exchanger section is disposed on the upstream side of the exhaust flow path, and the sub heat exchanger section is disposed on the downstream side of the exhaust flow path above (or below) the main heat exchanger section. The present invention can be similarly applied to the arranged form.
[0058]
Further, for example, in the above-described form, the mixing tank 53 is provided in the drain drainage channel 52 and the drain water and tap water are mixed in the mixing tank 53, but the drain water and tap water can be mixed as required. Alternatively, the mixing tank 53 can be omitted.
[0059]
  According to the combustion apparatus of the first aspect of the present invention, the combustion burner is composed of a plurality of burner portions, and the original gas on-off valve is disposed in the gas supply flow path for supplying the fuel gas to the combustion burner. A gas switching valve is disposed in the branch supply flow path portion on the downstream side of the flow path,The tap water supply means has a tap water supply flow path having a main flow path section and a branch flow path section, a water on-off valve, and a water switching on-off valve, and the control means includes an original gas on-off valve and a gas switching valve. Based on the open / close state, the water on / off valve and the switching on / off valve are controlled to open / close,With a simple configuration and simple control, the supply amount of tap water can be controlled as required, and wasteful use of tap water can be suppressed.
[0061]
  Further, the claims of the present invention2According to this combustion apparatus, the gas supply flow path has a plurality of branch supply flow path sections, each branch supply flow path section is provided with a gas switching valve, and the tap water supply flow path has a branch supply flow path. A plurality of branch flow passage portions corresponding to the number of portions, a water switching valve is provided in each branch flow passage portion, and the control means is a gas switching valve of the plurality of branch supply flow passage portions of the gas supply flow passage. Since the water switching valve of the branch channel portion of the tap water supply channel is controlled to open and close in accordance with the open / close state of the tap water, the supply amount of tap water can be controlled as required with simple control.
[0062]
  Further, the claims of the present invention3In this combustion apparatus, the combustion apparatus is composed of a heating combustion apparatus section and a hot water supply combustion apparatus section, and the heating gas supply channel for supplying fuel gas to the combustion burner of the heating combustion apparatus section is used for heating. An original gas on / off valve is provided, and a hot water supply gas on / off valve is provided in the hot water supply gas supply flow path for supplying fuel gas to the combustion burner of the hot water supply combustion unit. Since the amount of tap water supplied from the tap water supply means is controlled based on the open / closed state of the valve and the hot water supply gas on / off valve, the simple configuration and simple control can be used, and depending on the operating state of the combustion unit. The amount of tap water supplied can be controlled as required, and wasteful use of tap water can be suppressed.
[0063]
  Further, the claims of the present invention4According to the combustion apparatus, the tap water supply means includes the first and second tap water supply passages, and the first and second tap water supply passages are provided with the first and second water on / off valves, and are controlled. The means controls the opening and closing of the first and second water on / off valves corresponding to the open / close state of the heating source gas on / off valve and the hot water supply source gas on / off valve. The amount of tap water necessary to neutralize the drained water can be supplied with simple control.
[0064]
  Further claims of the present invention5According to this combustion apparatus, since the tap water is supplied from the tap water supply means until a predetermined time has elapsed after the combustion of the combustion burner, the drain water flowing through the drain drain flow path after combustion can be neutralized. it can.
[Brief description of the drawings]
FIG. 1 schematically shows a first embodiment of a combustion apparatus according to the present invention.
2 is a view showing a relationship between an open / close state of first and second gas switching valves and a supply amount of fuel gas in the combustion apparatus of FIG. 1; FIG.
3 is a diagram showing the relationship between the open / closed state of the first and second gas switching valves and the open / closed state of the water on / off valve and the first and second switching on / off valves in the combustion apparatus of FIG. 1. FIG.
FIG. 4 is a flowchart showing a part of control of the combustion apparatus of FIG. 1;
FIG. 5 is a diagram schematically showing a second embodiment of a combustion apparatus according to the present invention.
6 is a flowchart showing a part of control of the combustion apparatus of FIG. 5. FIG.
[Explanation of symbols]
2,2A Combustor
6,112 Combustion chamber
8,128 Exhaust flow path
12,106 Combustion burner
30,122 yuan gas on-off valve
32, 34 Gas switching valve
36,130 heat exchanger
38,132 Main heat exchanger
40,134 Sub heat exchanger section
48,152 Drain drainage means
52,156 Drain drainage channel
54,158 Tap water supply means
56, 160, 162 Tap water supply channel
64,164,166 Water on-off valve
66, 68 switching on-off valve
70,168 control means
102 Combustion unit for hot water supply
104 Combustion unit for heating

Claims

A heat exchanger that exchanges heat between the combustion burner that generates combustion exhaust gas and the combustion exhaust gas to recover sensible heat and latent heat, and collects and discharges drain water generated by the heat exchange of the heat exchanger. A drain draining means, a tap water supply means for supplying tap water to the drain drain means, and a control means for controlling the amount of tap water supplied from the tap water supply means, A combustion apparatus that neutralizes drain water flowing through the drain discharge flow path by supplying tap water from the tap water supply means to a drain discharge flow path of the drain drainage means,
The combustion burner includes a plurality of burner portions, and a downstream side portion of a gas supply passage for supplying fuel gas to the combustion burner is branched into a main supply passage portion and a branch supply passage portion, and the main supply portion The flow path part and the branch supply flow path part are respectively connected to the corresponding burner parts,
An original gas on-off valve is disposed upstream of the main supply flow path and the branch supply flow path in the gas supply flow path, and a gas switching valve is disposed in the branch flow path. Has been
The tap water supply means supplies tap water to the drain drain flow path of the drain drain means, a part of which is branched into a main flow path section and a branch flow path section, and the main flow path. A water on-off valve for supplying and stopping the supply of tap water through the section, and a switching on-off valve for supplying and stopping the supply of tap water through the branch flow path section,
The said control means controls the opening / closing of the said water on-off valve and the switching on-off valve according to the open / close state of the said original gas on-off valve and the said gas switching valve, The combustion apparatus characterized by the above-mentioned .

A plurality of branch supply flow path portions are provided on the downstream side of the gas supply flow path, the gas switching valves are respectively disposed in the plurality of branch supply flow path portions, and the tap water supply flow path is provided. Are provided with a plurality of branch flow passage portions corresponding to the number of the branch supply flow passage portions of the gas supply flow passage, and the plurality of branch flow passage portions are provided with the switching on-off valves, respectively. The control means corresponds to the open / closed state of the gas switching valve of the plurality of branch supply flow path portions of the gas supply flow path, and combustion apparatus according to claim 1, wherein the opening and closing controls the switching-off valve.

Composed of a heating combustion device for supplying hot water to the heating device and a hot water combustion device for supplying hot water, and the heating combustion device and the hot water combustion device are each combusted. A heat exchanger that exchanges heat between the combustion burner that generates exhaust gas and the combustion exhaust gas to recover sensible heat and latent heat, and collects and discharges drain water generated by the heat exchange of the heat exchanger. A drain draining means for connecting the drain draining means of the heating device combustion unit and the drain draining unit of the hot water supply combustion unit to join and drain the drain water, and A combustion apparatus provided with tap water supply means for supplying tap water used for diluting and neutralizing drain water, and control means for controlling the tap water supply means,
A heating gas supply flow path for supplying fuel gas is connected to the combustion burner of the heating combustion device section, and a heating source gas on / off valve is disposed in the heating gas supply flow path,
A hot water supply gas supply flow path for supplying fuel gas is connected to the combustion burner of the hot water supply combustion device section, and a hot water supply source gas on / off valve is disposed in the hot water supply gas supply flow path,
The combustor characterized in that the control means controls the amount of tap water supplied from the tap water supply means based on the open / closed state of the heating source gas on / off valve and the hot water supply source gas on / off valve. .

The tap water supply means includes first and second tap water supply passages for supplying tap water, and first and second water on / off valves disposed in the first and second tap water supply passages. And the control means controls opening and closing of the first and second water on / off valves in accordance with the on / off states of the heating source gas on / off valve and the hot water supply source gas on / off valve. 3. The combustion apparatus according to 3 .

The combustion apparatus according to any one of claims 1 to 4 , wherein the tap water supply means stops supplying tap water after a predetermined time has elapsed after the combustion of the combustion burner.